Added missing tegra files.HEADmaster

83 files changed, 23720 insertions, 0 deletions

diff --git a/fs/partitions/Kconfig b/fs/partitions/Kconfig
new file mode 100644
index 00000000000..cb5f0a3f1b0
--- /dev/null
+++ b/fs/partitions/Kconfig
@@ -0,0 +1,251 @@
+#
+# Partition configuration
+#
+config PARTITION_ADVANCED
+        bool "Advanced partition selection"
+        help
+          Say Y here if you would like to use hard disks under Linux which
+          were partitioned under an operating system running on a different
+          architecture than your Linux system.
+
+          Note that the answer to this question won't directly affect the
+          kernel: saying N will just cause the configurator to skip all
+          the questions about foreign partitioning schemes.
+
+          If unsure, say N.
+
+config ACORN_PARTITION
+        bool "Acorn partition support" if PARTITION_ADVANCED
+        default y if ARCH_ACORN
+        help
+          Support hard disks partitioned under Acorn operating systems.
+
+config ACORN_PARTITION_CUMANA
+        bool "Cumana partition support" if PARTITION_ADVANCED
+        default y if ARCH_ACORN
+        depends on ACORN_PARTITION
+        help
+          Say Y here if you would like to use hard disks under Linux which
+          were partitioned using the Cumana interface on Acorn machines.
+
+config ACORN_PARTITION_EESOX
+        bool "EESOX partition support" if PARTITION_ADVANCED
+        default y if ARCH_ACORN
+        depends on ACORN_PARTITION
+
+config ACORN_PARTITION_ICS
+        bool "ICS partition support" if PARTITION_ADVANCED
+        default y if ARCH_ACORN
+        depends on ACORN_PARTITION
+        help
+          Say Y here if you would like to use hard disks under Linux which
+          were partitioned using the ICS interface on Acorn machines.
+
+config ACORN_PARTITION_ADFS
+        bool "Native filecore partition support" if PARTITION_ADVANCED
+        default y if ARCH_ACORN
+        depends on ACORN_PARTITION
+        help
+          The Acorn Disc Filing System is the standard file system of the
+          RiscOS operating system which runs on Acorn's ARM-based Risc PC
+          systems and the Acorn Archimedes range of machines.  If you say
+          `Y' here, Linux will support disk partitions created under ADFS.
+
+config ACORN_PARTITION_POWERTEC
+        bool "PowerTec partition support" if PARTITION_ADVANCED
+        default y if ARCH_ACORN
+        depends on ACORN_PARTITION
+        help
+          Support reading partition tables created on Acorn machines using
+          the PowerTec SCSI drive.
+
+config ACORN_PARTITION_RISCIX
+        bool "RISCiX partition support" if PARTITION_ADVANCED
+        default y if ARCH_ACORN
+        depends on ACORN_PARTITION
+        help
+          Once upon a time, there was a native Unix port for the Acorn series
+          of machines called RISCiX.  If you say 'Y' here, Linux will be able
+          to read disks partitioned under RISCiX.
+
+config OSF_PARTITION
+        bool "Alpha OSF partition support" if PARTITION_ADVANCED
+        default y if ALPHA
+        help
+          Say Y here if you would like to use hard disks under Linux which
+          were partitioned on an Alpha machine.
+
+config AMIGA_PARTITION
+        bool "Amiga partition table support" if PARTITION_ADVANCED
+        default y if (AMIGA || AFFS_FS=y)
+        help
+          Say Y here if you would like to use hard disks under Linux which
+          were partitioned under AmigaOS.
+
+config ATARI_PARTITION
+        bool "Atari partition table support" if PARTITION_ADVANCED
+        default y if ATARI
+        help
+          Say Y here if you would like to use hard disks under Linux which
+          were partitioned under the Atari OS.
+
+config IBM_PARTITION
+        bool "IBM disk label and partition support"
+        depends on PARTITION_ADVANCED && S390
+        help
+          Say Y here if you would like to be able to read the hard disk
+          partition table format used by IBM DASD disks operating under CMS.
+          Otherwise, say N.
+
+config MAC_PARTITION
+        bool "Macintosh partition map support" if PARTITION_ADVANCED
+        default y if (MAC || PPC_PMAC)
+        help
+          Say Y here if you would like to use hard disks under Linux which
+          were partitioned on a Macintosh.
+
+config MSDOS_PARTITION
+        bool "PC BIOS (MSDOS partition tables) support" if PARTITION_ADVANCED
+        default y
+        help
+          Say Y here.
+
+config BSD_DISKLABEL
+        bool "BSD disklabel (FreeBSD partition tables) support"
+        depends on PARTITION_ADVANCED && MSDOS_PARTITION
+        help
+          FreeBSD uses its own hard disk partition scheme on your PC. It
+          requires only one entry in the primary partition table of your disk
+          and manages it similarly to DOS extended partitions, putting in its
+          first sector a new partition table in BSD disklabel format. Saying Y
+          here allows you to read these disklabels and further mount FreeBSD
+          partitions from within Linux if you have also said Y to "UFS
+          file system support", above. If you don't know what all this is
+          about, say N.
+
+config MINIX_SUBPARTITION
+        bool "Minix subpartition support"
+        depends on PARTITION_ADVANCED && MSDOS_PARTITION
+        help
+          Minix 2.0.0/2.0.2 subpartition table support for Linux.
+          Say Y here if you want to mount and use Minix 2.0.0/2.0.2
+          subpartitions.
+
+config SOLARIS_X86_PARTITION
+        bool "Solaris (x86) partition table support"
+        depends on PARTITION_ADVANCED && MSDOS_PARTITION
+        help
+          Like most systems, Solaris x86 uses its own hard disk partition
+          table format, incompatible with all others. Saying Y here allows you
+          to read these partition tables and further mount Solaris x86
+          partitions from within Linux if you have also said Y to "UFS
+          file system support", above.
+
+config UNIXWARE_DISKLABEL
+        bool "Unixware slices support"
+        depends on PARTITION_ADVANCED && MSDOS_PARTITION
+        ---help---
+          Like some systems, UnixWare uses its own slice table inside a
+          partition (VTOC - Virtual Table of Contents). Its format is
+          incompatible with all other OSes. Saying Y here allows you to read
+          VTOC and further mount UnixWare partitions read-only from within
+          Linux if you have also said Y to "UFS file system support" or
+          "System V and Coherent file system support", above.
+
+          This is mainly used to carry data from a UnixWare box to your
+          Linux box via a removable medium like magneto-optical, ZIP or
+          removable IDE drives. Note, however, that a good portable way to
+          transport files and directories between unixes (and even other
+          operating systems) is given by the tar program ("man tar" or
+          preferably "info tar").
+
+          If you don't know what all this is about, say N.
+
+config LDM_PARTITION
+        bool "Windows Logical Disk Manager (Dynamic Disk) support"
+        depends on PARTITION_ADVANCED
+        ---help---
+          Say Y here if you would like to use hard disks under Linux which
+          were partitioned using Windows 2000's/XP's or Vista's Logical Disk
+          Manager.  They are also known as "Dynamic Disks".
+
+          Note this driver only supports Dynamic Disks with a protective MBR
+          label, i.e. DOS partition table.  It does not support GPT labelled
+          Dynamic Disks yet as can be created with Vista.
+
+          Windows 2000 introduced the concept of Dynamic Disks to get around
+          the limitations of the PC's partitioning scheme.  The Logical Disk
+          Manager allows the user to repartition a disk and create spanned,
+          mirrored, striped or RAID volumes, all without the need for
+          rebooting.
+
+          Normal partitions are now called Basic Disks under Windows 2000, XP,
+          and Vista.
+
+          For a fuller description read <file:Documentation/ldm.txt>.
+
+          If unsure, say N.
+
+config LDM_DEBUG
+        bool "Windows LDM extra logging"
+        depends on LDM_PARTITION
+        help
+          Say Y here if you would like LDM to log verbosely.  This could be
+          helpful if the driver doesn't work as expected and you'd like to
+          report a bug.
+
+          If unsure, say N.
+
+config SGI_PARTITION
+        bool "SGI partition support" if PARTITION_ADVANCED
+        default y if DEFAULT_SGI_PARTITION
+        help
+          Say Y here if you would like to be able to read the hard disk
+          partition table format used by SGI machines.
+
+config ULTRIX_PARTITION
+        bool "Ultrix partition table support" if PARTITION_ADVANCED
+        default y if MACH_DECSTATION
+        help
+          Say Y here if you would like to be able to read the hard disk
+          partition table format used by DEC (now Compaq) Ultrix machines.
+          Otherwise, say N.
+
+config SUN_PARTITION
+        bool "Sun partition tables support" if PARTITION_ADVANCED
+        default y if (SPARC || SUN3 || SUN3X)
+        ---help---
+          Like most systems, SunOS uses its own hard disk partition table
+          format, incompatible with all others. Saying Y here allows you to
+          read these partition tables and further mount SunOS partitions from
+          within Linux if you have also said Y to "UFS file system support",
+          above. This is mainly used to carry data from a SPARC under SunOS to
+          your Linux box via a removable medium like magneto-optical or ZIP
+          drives; note however that a good portable way to transport files and
+          directories between unixes (and even other operating systems) is
+          given by the tar program ("man tar" or preferably "info tar"). If
+          you don't know what all this is about, say N.
+
+config KARMA_PARTITION
+        bool "Karma Partition support"
+        depends on PARTITION_ADVANCED
+        help
+          Say Y here if you would like to mount the Rio Karma MP3 player, as it
+          uses a proprietary partition table.
+
+config EFI_PARTITION
+        bool "EFI GUID Partition support"
+        depends on PARTITION_ADVANCED
+        select CRC32
+        help
+          Say Y here if you would like to use hard disks under Linux which
+          were partitioned using EFI GPT.
+
+config SYSV68_PARTITION
+        bool "SYSV68 partition table support" if PARTITION_ADVANCED
+        default y if VME
+        help
+          Say Y here if you would like to be able to read the hard disk
+          partition table format used by Motorola Delta machines (using
+          sysv68).
+          Otherwise, say N.
diff --git a/fs/partitions/Makefile b/fs/partitions/Makefile
new file mode 100644
index 00000000000..03af8eac51d
--- /dev/null
+++ b/fs/partitions/Makefile
@@ -0,0 +1,20 @@
+#
+# Makefile for the linux kernel.
+#
+
+obj-$(CONFIG_BLOCK) := check.o
+
+obj-$(CONFIG_ACORN_PARTITION) += acorn.o
+obj-$(CONFIG_AMIGA_PARTITION) += amiga.o
+obj-$(CONFIG_ATARI_PARTITION) += atari.o
+obj-$(CONFIG_MAC_PARTITION) += mac.o
+obj-$(CONFIG_LDM_PARTITION) += ldm.o
+obj-$(CONFIG_MSDOS_PARTITION) += msdos.o
+obj-$(CONFIG_OSF_PARTITION) += osf.o
+obj-$(CONFIG_SGI_PARTITION) += sgi.o
+obj-$(CONFIG_SUN_PARTITION) += sun.o
+obj-$(CONFIG_ULTRIX_PARTITION) += ultrix.o
+obj-$(CONFIG_IBM_PARTITION) += ibm.o
+obj-$(CONFIG_EFI_PARTITION) += efi.o
+obj-$(CONFIG_KARMA_PARTITION) += karma.o
+obj-$(CONFIG_SYSV68_PARTITION) += sysv68.o
diff --git a/fs/partitions/acorn.c b/fs/partitions/acorn.c
new file mode 100644
index 00000000000..fbeb697374d
--- /dev/null
+++ b/fs/partitions/acorn.c
@@ -0,0 +1,556 @@
+/*
+ *  linux/fs/partitions/acorn.c
+ *
+ *  Copyright (c) 1996-2000 Russell King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Scan ADFS partitions on hard disk drives.  Unfortunately, there
+ *  isn't a standard for partitioning drives on Acorn machines, so
+ *  every single manufacturer of SCSI and IDE cards created their own
+ *  method.
+ */
+#include <linux/buffer_head.h>
+#include <linux/adfs_fs.h>
+
+#include "check.h"
+#include "acorn.h"
+
+/*
+ * Partition types. (Oh for reusability)
+ */
+#define PARTITION_RISCIX_MFM    1
+#define PARTITION_RISCIX_SCSI   2
+#define PARTITION_LINUX         9
+
+#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
+        defined(CONFIG_ACORN_PARTITION_ADFS)
+static struct adfs_discrecord *
+adfs_partition(struct parsed_partitions *state, char *name, char *data,
+               unsigned long first_sector, int slot)
+{
+        struct adfs_discrecord *dr;
+        unsigned int nr_sects;
+
+        if (adfs_checkbblk(data))
+                return NULL;
+
+        dr = (struct adfs_discrecord *)(data + 0x1c0);
+
+        if (dr->disc_size == 0 && dr->disc_size_high == 0)
+                return NULL;
+
+        nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) |
+                   (le32_to_cpu(dr->disc_size) >> 9);
+
+        if (name) {
+                strlcat(state->pp_buf, " [", PAGE_SIZE);
+                strlcat(state->pp_buf, name, PAGE_SIZE);
+                strlcat(state->pp_buf, "]", PAGE_SIZE);
+        }
+        put_partition(state, slot, first_sector, nr_sects);
+        return dr;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+
+struct riscix_part {
+        __le32  start;
+        __le32  length;
+        __le32  one;
+        char    name[16];
+};
+
+struct riscix_record {
+        __le32  magic;
+#define RISCIX_MAGIC    cpu_to_le32(0x4a657320)
+        __le32  date;
+        struct riscix_part part[8];
+};
+
+#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
+        defined(CONFIG_ACORN_PARTITION_ADFS)
+static int riscix_partition(struct parsed_partitions *state,
+                            unsigned long first_sect, int slot,
+                            unsigned long nr_sects)
+{
+        Sector sect;
+        struct riscix_record *rr;
+        
+        rr = read_part_sector(state, first_sect, &sect);
+        if (!rr)
+                return -1;
+
+        strlcat(state->pp_buf, " [RISCiX]", PAGE_SIZE);
+
+
+        if (rr->magic == RISCIX_MAGIC) {
+                unsigned long size = nr_sects > 2 ? 2 : nr_sects;
+                int part;
+
+                strlcat(state->pp_buf, " <", PAGE_SIZE);
+
+                put_partition(state, slot++, first_sect, size);
+                for (part = 0; part < 8; part++) {
+                        if (rr->part[part].one &&
+                            memcmp(rr->part[part].name, "All\0", 4)) {
+                                put_partition(state, slot++,
+                                        le32_to_cpu(rr->part[part].start),
+                                        le32_to_cpu(rr->part[part].length));
+                                strlcat(state->pp_buf, "(", PAGE_SIZE);
+                                strlcat(state->pp_buf, rr->part[part].name, PAGE_SIZE);
+                                strlcat(state->pp_buf, ")", PAGE_SIZE);
+                        }
+                }
+
+                strlcat(state->pp_buf, " >\n", PAGE_SIZE);
+        } else {
+                put_partition(state, slot++, first_sect, nr_sects);
+        }
+
+        put_dev_sector(sect);
+        return slot;
+}
+#endif
+#endif
+
+#define LINUX_NATIVE_MAGIC 0xdeafa1de
+#define LINUX_SWAP_MAGIC   0xdeafab1e
+
+struct linux_part {
+        __le32 magic;
+        __le32 start_sect;
+        __le32 nr_sects;
+};
+
+#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
+        defined(CONFIG_ACORN_PARTITION_ADFS)
+static int linux_partition(struct parsed_partitions *state,
+                           unsigned long first_sect, int slot,
+                           unsigned long nr_sects)
+{
+        Sector sect;
+        struct linux_part *linuxp;
+        unsigned long size = nr_sects > 2 ? 2 : nr_sects;
+
+        strlcat(state->pp_buf, " [Linux]", PAGE_SIZE);
+
+        put_partition(state, slot++, first_sect, size);
+
+        linuxp = read_part_sector(state, first_sect, &sect);
+        if (!linuxp)
+                return -1;
+
+        strlcat(state->pp_buf, " <", PAGE_SIZE);
+        while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
+               linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
+                if (slot == state->limit)
+                        break;
+                put_partition(state, slot++, first_sect +
+                                 le32_to_cpu(linuxp->start_sect),
+                                 le32_to_cpu(linuxp->nr_sects));
+                linuxp ++;
+        }
+        strlcat(state->pp_buf, " >", PAGE_SIZE);
+
+        put_dev_sector(sect);
+        return slot;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_CUMANA
+int adfspart_check_CUMANA(struct parsed_partitions *state)
+{
+        unsigned long first_sector = 0;
+        unsigned int start_blk = 0;
+        Sector sect;
+        unsigned char *data;
+        char *name = "CUMANA/ADFS";
+        int first = 1;
+        int slot = 1;
+
+        /*
+         * Try Cumana style partitions - sector 6 contains ADFS boot block
+         * with pointer to next 'drive'.
+         *
+         * There are unknowns in this code - is the 'cylinder number' of the
+         * next partition relative to the start of this one - I'm assuming
+         * it is.
+         *
+         * Also, which ID did Cumana use?
+         *
+         * This is totally unfinished, and will require more work to get it
+         * going. Hence it is totally untested.
+         */
+        do {
+                struct adfs_discrecord *dr;
+                unsigned int nr_sects;
+
+                data = read_part_sector(state, start_blk * 2 + 6, &sect);
+                if (!data)
+                        return -1;
+
+                if (slot == state->limit)
+                        break;
+
+                dr = adfs_partition(state, name, data, first_sector, slot++);
+                if (!dr)
+                        break;
+
+                name = NULL;
+
+                nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *
+                           (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *
+                           dr->secspertrack;
+
+                if (!nr_sects)
+                        break;
+
+                first = 0;
+                first_sector += nr_sects;
+                start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
+                nr_sects = 0; /* hmm - should be partition size */
+
+                switch (data[0x1fc] & 15) {
+                case 0: /* No partition / ADFS? */
+                        break;
+
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+                case PARTITION_RISCIX_SCSI:
+                        /* RISCiX - we don't know how to find the next one. */
+                        slot = riscix_partition(state, first_sector, slot,
+                                                nr_sects);
+                        break;
+#endif
+
+                case PARTITION_LINUX:
+                        slot = linux_partition(state, first_sector, slot,
+                                               nr_sects);
+                        break;
+                }
+                put_dev_sector(sect);
+                if (slot == -1)
+                        return -1;
+        } while (1);
+        put_dev_sector(sect);
+        return first ? 0 : 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_ADFS
+/*
+ * Purpose: allocate ADFS partitions.
+ *
+ * Params : hd          - pointer to gendisk structure to store partition info.
+ *          dev         - device number to access.
+ *
+ * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
+ *
+ * Alloc  : hda  = whole drive
+ *          hda1 = ADFS partition on first drive.
+ *          hda2 = non-ADFS partition.
+ */
+int adfspart_check_ADFS(struct parsed_partitions *state)
+{
+        unsigned long start_sect, nr_sects, sectscyl, heads;
+        Sector sect;
+        unsigned char *data;
+        struct adfs_discrecord *dr;
+        unsigned char id;
+        int slot = 1;
+
+        data = read_part_sector(state, 6, &sect);
+        if (!data)
+                return -1;
+
+        dr = adfs_partition(state, "ADFS", data, 0, slot++);
+        if (!dr) {
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        heads = dr->heads + ((dr->lowsector >> 6) & 1);
+        sectscyl = dr->secspertrack * heads;
+        start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;
+        id = data[0x1fc] & 15;
+        put_dev_sector(sect);
+
+        /*
+         * Work out start of non-adfs partition.
+         */
+        nr_sects = (state->bdev->bd_inode->i_size >> 9) - start_sect;
+
+        if (start_sect) {
+                switch (id) {
+#ifdef CONFIG_ACORN_PARTITION_RISCIX
+                case PARTITION_RISCIX_SCSI:
+                case PARTITION_RISCIX_MFM:
+                        slot = riscix_partition(state, start_sect, slot,
+                                                nr_sects);
+                        break;
+#endif
+
+                case PARTITION_LINUX:
+                        slot = linux_partition(state, start_sect, slot,
+                                               nr_sects);
+                        break;
+                }
+        }
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_ICS
+
+struct ics_part {
+        __le32 start;
+        __le32 size;
+};
+
+static int adfspart_check_ICSLinux(struct parsed_partitions *state,
+                                   unsigned long block)
+{
+        Sector sect;
+        unsigned char *data = read_part_sector(state, block, &sect);
+        int result = 0;
+
+        if (data) {
+                if (memcmp(data, "LinuxPart", 9) == 0)
+                        result = 1;
+                put_dev_sector(sect);
+        }
+
+        return result;
+}
+
+/*
+ * Check for a valid ICS partition using the checksum.
+ */
+static inline int valid_ics_sector(const unsigned char *data)
+{
+        unsigned long sum;
+        int i;
+
+        for (i = 0, sum = 0x50617274; i < 508; i++)
+                sum += data[i];
+
+        sum -= le32_to_cpu(*(__le32 *)(&data[508]));
+
+        return sum == 0;
+}
+
+/*
+ * Purpose: allocate ICS partitions.
+ * Params : hd          - pointer to gendisk structure to store partition info.
+ *          dev         - device number to access.
+ * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
+ * Alloc  : hda  = whole drive
+ *          hda1 = ADFS partition 0 on first drive.
+ *          hda2 = ADFS partition 1 on first drive.
+ *              ..etc..
+ */
+int adfspart_check_ICS(struct parsed_partitions *state)
+{
+        const unsigned char *data;
+        const struct ics_part *p;
+        int slot;
+        Sector sect;
+
+        /*
+         * Try ICS style partitions - sector 0 contains partition info.
+         */
+        data = read_part_sector(state, 0, &sect);
+        if (!data)
+                return -1;
+
+        if (!valid_ics_sector(data)) {
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        strlcat(state->pp_buf, " [ICS]", PAGE_SIZE);
+
+        for (slot = 1, p = (const struct ics_part *)data; p->size; p++) {
+                u32 start = le32_to_cpu(p->start);
+                s32 size = le32_to_cpu(p->size); /* yes, it's signed. */
+
+                if (slot == state->limit)
+                        break;
+
+                /*
+                 * Negative sizes tell the RISC OS ICS driver to ignore
+                 * this partition - in effect it says that this does not
+                 * contain an ADFS filesystem.
+                 */
+                if (size < 0) {
+                        size = -size;
+
+                        /*
+                         * Our own extension - We use the first sector
+                         * of the partition to identify what type this
+                         * partition is.  We must not make this visible
+                         * to the filesystem.
+                         */
+                        if (size > 1 && adfspart_check_ICSLinux(state, start)) {
+                                start += 1;
+                                size -= 1;
+                        }
+                }
+
+                if (size)
+                        put_partition(state, slot++, start, size);
+        }
+
+        put_dev_sector(sect);
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_POWERTEC
+struct ptec_part {
+        __le32 unused1;
+        __le32 unused2;
+        __le32 start;
+        __le32 size;
+        __le32 unused5;
+        char type[8];
+};
+
+static inline int valid_ptec_sector(const unsigned char *data)
+{
+        unsigned char checksum = 0x2a;
+        int i;
+
+        /*
+         * If it looks like a PC/BIOS partition, then it
+         * probably isn't PowerTec.
+         */
+        if (data[510] == 0x55 && data[511] == 0xaa)
+                return 0;
+
+        for (i = 0; i < 511; i++)
+                checksum += data[i];
+
+        return checksum == data[511];
+}
+
+/*
+ * Purpose: allocate ICS partitions.
+ * Params : hd          - pointer to gendisk structure to store partition info.
+ *          dev         - device number to access.
+ * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
+ * Alloc  : hda  = whole drive
+ *          hda1 = ADFS partition 0 on first drive.
+ *          hda2 = ADFS partition 1 on first drive.
+ *              ..etc..
+ */
+int adfspart_check_POWERTEC(struct parsed_partitions *state)
+{
+        Sector sect;
+        const unsigned char *data;
+        const struct ptec_part *p;
+        int slot = 1;
+        int i;
+
+        data = read_part_sector(state, 0, &sect);
+        if (!data)
+                return -1;
+
+        if (!valid_ptec_sector(data)) {
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        strlcat(state->pp_buf, " [POWERTEC]", PAGE_SIZE);
+
+        for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) {
+                u32 start = le32_to_cpu(p->start);
+                u32 size = le32_to_cpu(p->size);
+
+                if (size)
+                        put_partition(state, slot++, start, size);
+        }
+
+        put_dev_sector(sect);
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        return 1;
+}
+#endif
+
+#ifdef CONFIG_ACORN_PARTITION_EESOX
+struct eesox_part {
+        char    magic[6];
+        char    name[10];
+        __le32  start;
+        __le32  unused6;
+        __le32  unused7;
+        __le32  unused8;
+};
+
+/*
+ * Guess who created this format?
+ */
+static const char eesox_name[] = {
+        'N', 'e', 'i', 'l', ' ',
+        'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' '
+};
+
+/*
+ * EESOX SCSI partition format.
+ *
+ * This is a goddamned awful partition format.  We don't seem to store
+ * the size of the partition in this table, only the start addresses.
+ *
+ * There are two possibilities where the size comes from:
+ *  1. The individual ADFS boot block entries that are placed on the disk.
+ *  2. The start address of the next entry.
+ */
+int adfspart_check_EESOX(struct parsed_partitions *state)
+{
+        Sector sect;
+        const unsigned char *data;
+        unsigned char buffer[256];
+        struct eesox_part *p;
+        sector_t start = 0;
+        int i, slot = 1;
+
+        data = read_part_sector(state, 7, &sect);
+        if (!data)
+                return -1;
+
+        /*
+         * "Decrypt" the partition table.  God knows why...
+         */
+        for (i = 0; i < 256; i++)
+                buffer[i] = data[i] ^ eesox_name[i & 15];
+
+        put_dev_sector(sect);
+
+        for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) {
+                sector_t next;
+
+                if (memcmp(p->magic, "Eesox", 6))
+                        break;
+
+                next = le32_to_cpu(p->start);
+                if (i)
+                        put_partition(state, slot++, start, next - start);
+                start = next;
+        }
+
+        if (i != 0) {
+                sector_t size;
+
+                size = get_capacity(state->bdev->bd_disk);
+                put_partition(state, slot++, start, size - start);
+                strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        }
+
+        return i ? 1 : 0;
+}
+#endif
diff --git a/fs/partitions/acorn.h b/fs/partitions/acorn.h
new file mode 100644
index 00000000000..ede82852969
--- /dev/null
+++ b/fs/partitions/acorn.h
@@ -0,0 +1,14 @@
+/*
+ * linux/fs/partitions/acorn.h
+ *
+ * Copyright (C) 1996-2001 Russell King.
+ *
+ *  I _hate_ this partitioning mess - why can't we have one defined
+ *  format, and everyone stick to it?
+ */
+
+int adfspart_check_CUMANA(struct parsed_partitions *state);
+int adfspart_check_ADFS(struct parsed_partitions *state);
+int adfspart_check_ICS(struct parsed_partitions *state);
+int adfspart_check_POWERTEC(struct parsed_partitions *state);
+int adfspart_check_EESOX(struct parsed_partitions *state);
diff --git a/fs/partitions/amiga.c b/fs/partitions/amiga.c
new file mode 100644
index 00000000000..70cbf44a156
--- /dev/null
+++ b/fs/partitions/amiga.c
@@ -0,0 +1,139 @@
+/*
+ *  fs/partitions/amiga.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/types.h>
+#include <linux/affs_hardblocks.h>
+
+#include "check.h"
+#include "amiga.h"
+
+static __inline__ u32
+checksum_block(__be32 *m, int size)
+{
+        u32 sum = 0;
+
+        while (size--)
+                sum += be32_to_cpu(*m++);
+        return sum;
+}
+
+int amiga_partition(struct parsed_partitions *state)
+{
+        Sector sect;
+        unsigned char *data;
+        struct RigidDiskBlock *rdb;
+        struct PartitionBlock *pb;
+        int start_sect, nr_sects, blk, part, res = 0;
+        int blksize = 1;        /* Multiplier for disk block size */
+        int slot = 1;
+        char b[BDEVNAME_SIZE];
+
+        for (blk = 0; ; blk++, put_dev_sector(sect)) {
+                if (blk == RDB_ALLOCATION_LIMIT)
+                        goto rdb_done;
+                data = read_part_sector(state, blk, &sect);
+                if (!data) {
+                        if (warn_no_part)
+                                printk("Dev %s: unable to read RDB block %d\n",
+                                       bdevname(state->bdev, b), blk);
+                        res = -1;
+                        goto rdb_done;
+                }
+                if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
+                        continue;
+
+                rdb = (struct RigidDiskBlock *)data;
+                if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
+                        break;
+                /* Try again with 0xdc..0xdf zeroed, Windows might have
+                 * trashed it.
+                 */
+                *(__be32 *)(data+0xdc) = 0;
+                if (checksum_block((__be32 *)data,
+                                be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
+                        printk("Warning: Trashed word at 0xd0 in block %d "
+                                "ignored in checksum calculation\n",blk);
+                        break;
+                }
+
+                printk("Dev %s: RDB in block %d has bad checksum\n",
+                       bdevname(state->bdev, b), blk);
+        }
+
+        /* blksize is blocks per 512 byte standard block */
+        blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
+
+        {
+                char tmp[7 + 10 + 1 + 1];
+
+                /* Be more informative */
+                snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
+                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+        }
+        blk = be32_to_cpu(rdb->rdb_PartitionList);
+        put_dev_sector(sect);
+        for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
+                blk *= blksize; /* Read in terms partition table understands */
+                data = read_part_sector(state, blk, &sect);
+                if (!data) {
+                        if (warn_no_part)
+                                printk("Dev %s: unable to read partition block %d\n",
+                                       bdevname(state->bdev, b), blk);
+                        res = -1;
+                        goto rdb_done;
+                }
+                pb  = (struct PartitionBlock *)data;
+                blk = be32_to_cpu(pb->pb_Next);
+                if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
+                        continue;
+                if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
+                        continue;
+
+                /* Tell Kernel about it */
+
+                nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
+                            be32_to_cpu(pb->pb_Environment[9])) *
+                           be32_to_cpu(pb->pb_Environment[3]) *
+                           be32_to_cpu(pb->pb_Environment[5]) *
+                           blksize;
+                if (!nr_sects)
+                        continue;
+                start_sect = be32_to_cpu(pb->pb_Environment[9]) *
+                             be32_to_cpu(pb->pb_Environment[3]) *
+                             be32_to_cpu(pb->pb_Environment[5]) *
+                             blksize;
+                put_partition(state,slot++,start_sect,nr_sects);
+                {
+                        /* Be even more informative to aid mounting */
+                        char dostype[4];
+                        char tmp[42];
+
+                        __be32 *dt = (__be32 *)dostype;
+                        *dt = pb->pb_Environment[16];
+                        if (dostype[3] < ' ')
+                                snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
+                                        dostype[0], dostype[1],
+                                        dostype[2], dostype[3] + '@' );
+                        else
+                                snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
+                                        dostype[0], dostype[1],
+                                        dostype[2], dostype[3]);
+                        strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                        snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
+                                be32_to_cpu(pb->pb_Environment[6]),
+                                be32_to_cpu(pb->pb_Environment[4]));
+                        strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                }
+                res = 1;
+        }
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+
+rdb_done:
+        return res;
+}
diff --git a/fs/partitions/amiga.h b/fs/partitions/amiga.h
new file mode 100644
index 00000000000..d094585cada
--- /dev/null
+++ b/fs/partitions/amiga.h
@@ -0,0 +1,6 @@
+/*
+ *  fs/partitions/amiga.h
+ */
+
+int amiga_partition(struct parsed_partitions *state);
+
diff --git a/fs/partitions/atari.c b/fs/partitions/atari.c
new file mode 100644
index 00000000000..9875b05e80a
--- /dev/null
+++ b/fs/partitions/atari.c
@@ -0,0 +1,149 @@
+/*
+ *  fs/partitions/atari.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/ctype.h>
+#include "check.h"
+#include "atari.h"
+
+/* ++guenther: this should be settable by the user ("make config")?.
+ */
+#define ICD_PARTS
+
+/* check if a partition entry looks valid -- Atari format is assumed if at
+   least one of the primary entries is ok this way */
+#define VALID_PARTITION(pi,hdsiz)                                            \
+    (((pi)->flg & 1) &&                                                      \
+     isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
+     be32_to_cpu((pi)->st) <= (hdsiz) &&                                     \
+     be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
+
+static inline int OK_id(char *s)
+{
+        return  memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
+                memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
+                memcmp (s, "RAW", 3) == 0 ;
+}
+
+int atari_partition(struct parsed_partitions *state)
+{
+        Sector sect;
+        struct rootsector *rs;
+        struct partition_info *pi;
+        u32 extensect;
+        u32 hd_size;
+        int slot;
+#ifdef ICD_PARTS
+        int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
+#endif
+
+        rs = read_part_sector(state, 0, &sect);
+        if (!rs)
+                return -1;
+
+        /* Verify this is an Atari rootsector: */
+        hd_size = state->bdev->bd_inode->i_size >> 9;
+        if (!VALID_PARTITION(&rs->part[0], hd_size) &&
+            !VALID_PARTITION(&rs->part[1], hd_size) &&
+            !VALID_PARTITION(&rs->part[2], hd_size) &&
+            !VALID_PARTITION(&rs->part[3], hd_size)) {
+                /*
+                 * if there's no valid primary partition, assume that no Atari
+                 * format partition table (there's no reliable magic or the like
+                 * :-()
+                 */
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        pi = &rs->part[0];
+        strlcat(state->pp_buf, " AHDI", PAGE_SIZE);
+        for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {
+                struct rootsector *xrs;
+                Sector sect2;
+                ulong partsect;
+
+                if ( !(pi->flg & 1) )
+                        continue;
+                /* active partition */
+                if (memcmp (pi->id, "XGM", 3) != 0) {
+                        /* we don't care about other id's */
+                        put_partition (state, slot, be32_to_cpu(pi->st),
+                                        be32_to_cpu(pi->siz));
+                        continue;
+                }
+                /* extension partition */
+#ifdef ICD_PARTS
+                part_fmt = 1;
+#endif
+                strlcat(state->pp_buf, " XGM<", PAGE_SIZE);
+                partsect = extensect = be32_to_cpu(pi->st);
+                while (1) {
+                        xrs = read_part_sector(state, partsect, &sect2);
+                        if (!xrs) {
+                                printk (" block %ld read failed\n", partsect);
+                                put_dev_sector(sect);
+                                return -1;
+                        }
+
+                        /* ++roman: sanity check: bit 0 of flg field must be set */
+                        if (!(xrs->part[0].flg & 1)) {
+                                printk( "\nFirst sub-partition in extended partition is not valid!\n" );
+                                put_dev_sector(sect2);
+                                break;
+                        }
+
+                        put_partition(state, slot,
+                                   partsect + be32_to_cpu(xrs->part[0].st),
+                                   be32_to_cpu(xrs->part[0].siz));
+
+                        if (!(xrs->part[1].flg & 1)) {
+                                /* end of linked partition list */
+                                put_dev_sector(sect2);
+                                break;
+                        }
+                        if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
+                                printk("\nID of extended partition is not XGM!\n");
+                                put_dev_sector(sect2);
+                                break;
+                        }
+
+                        partsect = be32_to_cpu(xrs->part[1].st) + extensect;
+                        put_dev_sector(sect2);
+                        if (++slot == state->limit) {
+                                printk( "\nMaximum number of partitions reached!\n" );
+                                break;
+                        }
+                }
+                strlcat(state->pp_buf, " >", PAGE_SIZE);
+        }
+#ifdef ICD_PARTS
+        if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
+                pi = &rs->icdpart[0];
+                /* sanity check: no ICD format if first partition invalid */
+                if (OK_id(pi->id)) {
+                        strlcat(state->pp_buf, " ICD<", PAGE_SIZE);
+                        for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {
+                                /* accept only GEM,BGM,RAW,LNX,SWP partitions */
+                                if (!((pi->flg & 1) && OK_id(pi->id)))
+                                        continue;
+                                part_fmt = 2;
+                                put_partition (state, slot,
+                                                be32_to_cpu(pi->st),
+                                                be32_to_cpu(pi->siz));
+                        }
+                        strlcat(state->pp_buf, " >", PAGE_SIZE);
+                }
+        }
+#endif
+        put_dev_sector(sect);
+
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+
+        return 1;
+}
diff --git a/fs/partitions/atari.h b/fs/partitions/atari.h
new file mode 100644
index 00000000000..fe2d32a89f3
--- /dev/null
+++ b/fs/partitions/atari.h
@@ -0,0 +1,34 @@
+/*
+ *  fs/partitions/atari.h
+ *  Moved by Russell King from:
+ *
+ * linux/include/linux/atari_rootsec.h
+ * definitions for Atari Rootsector layout
+ * by Andreas Schwab (schwab@ls5.informatik.uni-dortmund.de)
+ *
+ * modified for ICD/Supra partitioning scheme restricted to at most 12
+ * partitions
+ * by Guenther Kelleter (guenther@pool.informatik.rwth-aachen.de)
+ */
+
+struct partition_info
+{
+  u8 flg;                       /* bit 0: active; bit 7: bootable */
+  char id[3];                   /* "GEM", "BGM", "XGM", or other */
+  __be32 st;                    /* start of partition */
+  __be32 siz;                   /* length of partition */
+};
+
+struct rootsector
+{
+  char unused[0x156];           /* room for boot code */
+  struct partition_info icdpart[8];     /* info for ICD-partitions 5..12 */
+  char unused2[0xc];
+  u32 hd_siz;                   /* size of disk in blocks */
+  struct partition_info part[4];
+  u32 bsl_st;                   /* start of bad sector list */
+  u32 bsl_cnt;                  /* length of bad sector list */
+  u16 checksum;                 /* checksum for bootable disks */
+} __attribute__((__packed__));
+
+int atari_partition(struct parsed_partitions *state);
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
new file mode 100644
index 00000000000..b4095cc7343
--- /dev/null
+++ b/fs/partitions/check.c
@@ -0,0 +1,698 @@
+/*
+ *  fs/partitions/check.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ *
+ *  We now have independent partition support from the
+ *  block drivers, which allows all the partition code to
+ *  be grouped in one location, and it to be mostly self
+ *  contained.
+ *
+ *  Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/kmod.h>
+#include <linux/ctype.h>
+#include <linux/genhd.h>
+#include <linux/blktrace_api.h>
+
+#include "check.h"
+
+#include "acorn.h"
+#include "amiga.h"
+#include "atari.h"
+#include "ldm.h"
+#include "mac.h"
+#include "msdos.h"
+#include "osf.h"
+#include "sgi.h"
+#include "sun.h"
+#include "ibm.h"
+#include "ultrix.h"
+#include "efi.h"
+#include "karma.h"
+#include "sysv68.h"
+
+#ifdef CONFIG_BLK_DEV_MD
+extern void md_autodetect_dev(dev_t dev);
+#endif
+
+int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
+
+static int (*check_part[])(struct parsed_partitions *) = {
+        /*
+         * Probe partition formats with tables at disk address 0
+         * that also have an ADFS boot block at 0xdc0.
+         */
+#ifdef CONFIG_ACORN_PARTITION_ICS
+        adfspart_check_ICS,
+#endif
+#ifdef CONFIG_ACORN_PARTITION_POWERTEC
+        adfspart_check_POWERTEC,
+#endif
+#ifdef CONFIG_ACORN_PARTITION_EESOX
+        adfspart_check_EESOX,
+#endif
+
+        /*
+         * Now move on to formats that only have partition info at
+         * disk address 0xdc0.  Since these may also have stale
+         * PC/BIOS partition tables, they need to come before
+         * the msdos entry.
+         */
+#ifdef CONFIG_ACORN_PARTITION_CUMANA
+        adfspart_check_CUMANA,
+#endif
+#ifdef CONFIG_ACORN_PARTITION_ADFS
+        adfspart_check_ADFS,
+#endif
+
+#ifdef CONFIG_EFI_PARTITION
+        efi_partition,          /* this must come before msdos */
+#endif
+#ifdef CONFIG_SGI_PARTITION
+        sgi_partition,
+#endif
+#ifdef CONFIG_LDM_PARTITION
+        ldm_partition,          /* this must come before msdos */
+#endif
+#ifdef CONFIG_MSDOS_PARTITION
+        msdos_partition,
+#endif
+#ifdef CONFIG_OSF_PARTITION
+        osf_partition,
+#endif
+#ifdef CONFIG_SUN_PARTITION
+        sun_partition,
+#endif
+#ifdef CONFIG_AMIGA_PARTITION
+        amiga_partition,
+#endif
+#ifdef CONFIG_ATARI_PARTITION
+        atari_partition,
+#endif
+#ifdef CONFIG_MAC_PARTITION
+        mac_partition,
+#endif
+#ifdef CONFIG_ULTRIX_PARTITION
+        ultrix_partition,
+#endif
+#ifdef CONFIG_IBM_PARTITION
+        ibm_partition,
+#endif
+#ifdef CONFIG_KARMA_PARTITION
+        karma_partition,
+#endif
+#ifdef CONFIG_SYSV68_PARTITION
+        sysv68_partition,
+#endif
+        NULL
+};
+ 
+/*
+ * disk_name() is used by partition check code and the genhd driver.
+ * It formats the devicename of the indicated disk into
+ * the supplied buffer (of size at least 32), and returns
+ * a pointer to that same buffer (for convenience).
+ */
+
+char *disk_name(struct gendisk *hd, int partno, char *buf)
+{
+        if (!partno)
+                snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
+        else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
+                snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
+        else
+                snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
+
+        return buf;
+}
+
+const char *bdevname(struct block_device *bdev, char *buf)
+{
+        return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
+}
+
+EXPORT_SYMBOL(bdevname);
+
+/*
+ * There's very little reason to use this, you should really
+ * have a struct block_device just about everywhere and use
+ * bdevname() instead.
+ */
+const char *__bdevname(dev_t dev, char *buffer)
+{
+        scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
+                                MAJOR(dev), MINOR(dev));
+        return buffer;
+}
+
+EXPORT_SYMBOL(__bdevname);
+
+static struct parsed_partitions *
+check_partition(struct gendisk *hd, struct block_device *bdev)
+{
+        struct parsed_partitions *state;
+        int i, res, err;
+
+        state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
+        if (!state)
+                return NULL;
+        state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
+        if (!state->pp_buf) {
+                kfree(state);
+                return NULL;
+        }
+        state->pp_buf[0] = '\0';
+
+        state->bdev = bdev;
+        disk_name(hd, 0, state->name);
+        snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
+        if (isdigit(state->name[strlen(state->name)-1]))
+                sprintf(state->name, "p");
+
+        state->limit = disk_max_parts(hd);
+        i = res = err = 0;
+        while (!res && check_part[i]) {
+                memset(&state->parts, 0, sizeof(state->parts));
+                res = check_part[i++](state);
+                if (res < 0) {
+                        /* We have hit an I/O error which we don't report now.
+                        * But record it, and let the others do their job.
+                        */
+                        err = res;
+                        res = 0;
+                }
+
+        }
+        if (res > 0) {
+                printk(KERN_INFO "%s", state->pp_buf);
+
+                free_page((unsigned long)state->pp_buf);
+                return state;
+        }
+        if (state->access_beyond_eod)
+                err = -ENOSPC;
+        if (err)
+        /* The partition is unrecognized. So report I/O errors if there were any */
+                res = err;
+        if (!res)
+                strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE);
+        else if (warn_no_part)
+                strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE);
+
+        printk(KERN_INFO "%s", state->pp_buf);
+
+        free_page((unsigned long)state->pp_buf);
+        kfree(state);
+        return ERR_PTR(res);
+}
+
+static ssize_t part_partition_show(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+
+        return sprintf(buf, "%d\n", p->partno);
+}
+
+static ssize_t part_start_show(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+
+        return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
+}
+
+ssize_t part_size_show(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+        return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
+}
+
+static ssize_t part_ro_show(struct device *dev,
+                            struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+        return sprintf(buf, "%d\n", p->policy ? 1 : 0);
+}
+
+static ssize_t part_alignment_offset_show(struct device *dev,
+                                          struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+        return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
+}
+
+static ssize_t part_discard_alignment_show(struct device *dev,
+                                           struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+        return sprintf(buf, "%u\n", p->discard_alignment);
+}
+
+ssize_t part_stat_show(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+        int cpu;
+
+        cpu = part_stat_lock();
+        part_round_stats(cpu, p);
+        part_stat_unlock();
+        return sprintf(buf,
+                "%8lu %8lu %8llu %8u "
+                "%8lu %8lu %8llu %8u "
+                "%8u %8u %8u"
+                "\n",
+                part_stat_read(p, ios[READ]),
+                part_stat_read(p, merges[READ]),
+                (unsigned long long)part_stat_read(p, sectors[READ]),
+                jiffies_to_msecs(part_stat_read(p, ticks[READ])),
+                part_stat_read(p, ios[WRITE]),
+                part_stat_read(p, merges[WRITE]),
+                (unsigned long long)part_stat_read(p, sectors[WRITE]),
+                jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
+                part_in_flight(p),
+                jiffies_to_msecs(part_stat_read(p, io_ticks)),
+                jiffies_to_msecs(part_stat_read(p, time_in_queue)));
+}
+
+ssize_t part_inflight_show(struct device *dev,
+                        struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+
+        return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]),
+                atomic_read(&p->in_flight[1]));
+}
+
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+ssize_t part_fail_show(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
+
+        return sprintf(buf, "%d\n", p->make_it_fail);
+}
+
+ssize_t part_fail_store(struct device *dev,
+                        struct device_attribute *attr,
+                        const char *buf, size_t count)
+{
+        struct hd_struct *p = dev_to_part(dev);
+        int i;
+
+        if (count > 0 && sscanf(buf, "%d", &i) > 0)
+                p->make_it_fail = (i == 0) ? 0 : 1;
+
+        return count;
+}
+#endif
+
+static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
+static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
+static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
+static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL);
+static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
+static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
+                   NULL);
+static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
+static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+static struct device_attribute dev_attr_fail =
+        __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
+#endif
+
+static struct attribute *part_attrs[] = {
+        &dev_attr_partition.attr,
+        &dev_attr_start.attr,
+        &dev_attr_size.attr,
+        &dev_attr_ro.attr,
+        &dev_attr_alignment_offset.attr,
+        &dev_attr_discard_alignment.attr,
+        &dev_attr_stat.attr,
+        &dev_attr_inflight.attr,
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+        &dev_attr_fail.attr,
+#endif
+        NULL
+};
+
+static struct attribute_group part_attr_group = {
+        .attrs = part_attrs,
+};
+
+static const struct attribute_group *part_attr_groups[] = {
+        &part_attr_group,
+#ifdef CONFIG_BLK_DEV_IO_TRACE
+        &blk_trace_attr_group,
+#endif
+        NULL
+};
+
+static void part_release(struct device *dev)
+{
+        struct hd_struct *p = dev_to_part(dev);
+        free_part_stats(p);
+        free_part_info(p);
+        kfree(p);
+}
+
+static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+        struct hd_struct *part = dev_to_part(dev);
+
+        add_uevent_var(env, "PARTN=%u", part->partno);
+        if (part->info && part->info->volname[0])
+                add_uevent_var(env, "PARTNAME=%s", part->info->volname);
+        return 0;
+}
+
+struct device_type part_type = {
+        .name           = "partition",
+        .groups         = part_attr_groups,
+        .release        = part_release,
+        .uevent         = part_uevent,
+};
+
+static void delete_partition_rcu_cb(struct rcu_head *head)
+{
+        struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
+
+        part->start_sect = 0;
+        part->nr_sects = 0;
+        part_stat_set_all(part, 0);
+        put_device(part_to_dev(part));
+}
+
+void __delete_partition(struct hd_struct *part)
+{
+        call_rcu(&part->rcu_head, delete_partition_rcu_cb);
+}
+
+void delete_partition(struct gendisk *disk, int partno)
+{
+        struct disk_part_tbl *ptbl = disk->part_tbl;
+        struct hd_struct *part;
+
+        if (partno >= ptbl->len)
+                return;
+
+        part = ptbl->part[partno];
+        if (!part)
+                return;
+
+        blk_free_devt(part_devt(part));
+        rcu_assign_pointer(ptbl->part[partno], NULL);
+        rcu_assign_pointer(ptbl->last_lookup, NULL);
+        kobject_put(part->holder_dir);
+        device_del(part_to_dev(part));
+
+        hd_struct_put(part);
+}
+
+static ssize_t whole_disk_show(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+        return 0;
+}
+static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
+                   whole_disk_show, NULL);
+
+struct hd_struct *add_partition(struct gendisk *disk, int partno,
+                                sector_t start, sector_t len, int flags,
+                                struct partition_meta_info *info)
+{
+        struct hd_struct *p;
+        dev_t devt = MKDEV(0, 0);
+        struct device *ddev = disk_to_dev(disk);
+        struct device *pdev;
+        struct disk_part_tbl *ptbl;
+        const char *dname;
+        int err;
+
+        err = disk_expand_part_tbl(disk, partno);
+        if (err)
+                return ERR_PTR(err);
+        ptbl = disk->part_tbl;
+
+        if (ptbl->part[partno])
+                return ERR_PTR(-EBUSY);
+
+        p = kzalloc(sizeof(*p), GFP_KERNEL);
+        if (!p)
+                return ERR_PTR(-EBUSY);
+
+        if (!init_part_stats(p)) {
+                err = -ENOMEM;
+                goto out_free;
+        }
+        pdev = part_to_dev(p);
+
+        p->start_sect = start;
+        p->alignment_offset =
+                queue_limit_alignment_offset(&disk->queue->limits, start);
+        p->discard_alignment =
+                queue_limit_discard_alignment(&disk->queue->limits, start);
+        p->nr_sects = len;
+        p->partno = partno;
+        p->policy = get_disk_ro(disk);
+
+        if (info) {
+                struct partition_meta_info *pinfo = alloc_part_info(disk);
+                if (!pinfo)
+                        goto out_free_stats;
+                memcpy(pinfo, info, sizeof(*info));
+                p->info = pinfo;
+        }
+
+        dname = dev_name(ddev);
+        if (isdigit(dname[strlen(dname) - 1]))
+                dev_set_name(pdev, "%sp%d", dname, partno);
+        else
+                dev_set_name(pdev, "%s%d", dname, partno);
+
+        device_initialize(pdev);
+        pdev->class = &block_class;
+        pdev->type = &part_type;
+        pdev->parent = ddev;
+
+        err = blk_alloc_devt(p, &devt);
+        if (err)
+                goto out_free_info;
+        pdev->devt = devt;
+
+        /* delay uevent until 'holders' subdir is created */
+        dev_set_uevent_suppress(pdev, 1);
+        err = device_add(pdev);
+        if (err)
+                goto out_put;
+
+        err = -ENOMEM;
+        p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
+        if (!p->holder_dir)
+                goto out_del;
+
+        dev_set_uevent_suppress(pdev, 0);
+        if (flags & ADDPART_FLAG_WHOLEDISK) {
+                err = device_create_file(pdev, &dev_attr_whole_disk);
+                if (err)
+                        goto out_del;
+        }
+
+        /* everything is up and running, commence */
+        rcu_assign_pointer(ptbl->part[partno], p);
+
+        /* suppress uevent if the disk suppresses it */
+        if (!dev_get_uevent_suppress(ddev))
+                kobject_uevent(&pdev->kobj, KOBJ_ADD);
+
+        hd_ref_init(p);
+        return p;
+
+out_free_info:
+        free_part_info(p);
+out_free_stats:
+        free_part_stats(p);
+out_free:
+        kfree(p);
+        return ERR_PTR(err);
+out_del:
+        kobject_put(p->holder_dir);
+        device_del(pdev);
+out_put:
+        put_device(pdev);
+        blk_free_devt(devt);
+        return ERR_PTR(err);
+}
+
+static bool disk_unlock_native_capacity(struct gendisk *disk)
+{
+        const struct block_device_operations *bdops = disk->fops;
+
+        if (bdops->unlock_native_capacity &&
+            !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
+                printk(KERN_CONT "enabling native capacity\n");
+                bdops->unlock_native_capacity(disk);
+                disk->flags |= GENHD_FL_NATIVE_CAPACITY;
+                return true;
+        } else {
+                printk(KERN_CONT "truncated\n");
+                return false;
+        }
+}
+
+int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
+{
+        struct parsed_partitions *state = NULL;
+        struct disk_part_iter piter;
+        struct hd_struct *part;
+        int p, highest, res;
+rescan:
+        if (state && !IS_ERR(state)) {
+                kfree(state);
+                state = NULL;
+        }
+
+        if (bdev->bd_part_count)
+                return -EBUSY;
+        res = invalidate_partition(disk, 0);
+        if (res)
+                return res;
+
+        disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
+        while ((part = disk_part_iter_next(&piter)))
+                delete_partition(disk, part->partno);
+        disk_part_iter_exit(&piter);
+
+        if (disk->fops->revalidate_disk)
+                disk->fops->revalidate_disk(disk);
+        check_disk_size_change(disk, bdev);
+        bdev->bd_invalidated = 0;
+        if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
+                return 0;
+        if (IS_ERR(state)) {
+                /*
+                 * I/O error reading the partition table.  If any
+                 * partition code tried to read beyond EOD, retry
+                 * after unlocking native capacity.
+                 */
+                if (PTR_ERR(state) == -ENOSPC) {
+                        printk(KERN_WARNING "%s: partition table beyond EOD, ",
+                               disk->disk_name);
+                        if (disk_unlock_native_capacity(disk))
+                                goto rescan;
+                }
+                return -EIO;
+        }
+        /*
+         * If any partition code tried to read beyond EOD, try
+         * unlocking native capacity even if partition table is
+         * successfully read as we could be missing some partitions.
+         */
+        if (state->access_beyond_eod) {
+                printk(KERN_WARNING
+                       "%s: partition table partially beyond EOD, ",
+                       disk->disk_name);
+                if (disk_unlock_native_capacity(disk))
+                        goto rescan;
+        }
+
+        /* tell userspace that the media / partition table may have changed */
+        kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+
+        /* Detect the highest partition number and preallocate
+         * disk->part_tbl.  This is an optimization and not strictly
+         * necessary.
+         */
+        for (p = 1, highest = 0; p < state->limit; p++)
+                if (state->parts[p].size)
+                        highest = p;
+
+        disk_expand_part_tbl(disk, highest);
+
+        /* add partitions */
+        for (p = 1; p < state->limit; p++) {
+                sector_t size, from;
+                struct partition_meta_info *info = NULL;
+
+                size = state->parts[p].size;
+                if (!size)
+                        continue;
+
+                from = state->parts[p].from;
+                if (from >= get_capacity(disk)) {
+                        printk(KERN_WARNING
+                               "%s: p%d start %llu is beyond EOD, ",
+                               disk->disk_name, p, (unsigned long long) from);
+                        if (disk_unlock_native_capacity(disk))
+                                goto rescan;
+                        continue;
+                }
+
+                if (from + size > get_capacity(disk)) {
+                        printk(KERN_WARNING
+                               "%s: p%d size %llu extends beyond EOD, ",
+                               disk->disk_name, p, (unsigned long long) size);
+
+                        if (disk_unlock_native_capacity(disk)) {
+                                /* free state and restart */
+                                goto rescan;
+                        } else {
+                                /*
+                                 * we can not ignore partitions of broken tables
+                                 * created by for example camera firmware, but
+                                 * we limit them to the end of the disk to avoid
+                                 * creating invalid block devices
+                                 */
+                                size = get_capacity(disk) - from;
+                        }
+                }
+
+                if (state->parts[p].has_info)
+                        info = &state->parts[p].info;
+                part = add_partition(disk, p, from, size,
+                                     state->parts[p].flags,
+                                     &state->parts[p].info);
+                if (IS_ERR(part)) {
+                        printk(KERN_ERR " %s: p%d could not be added: %ld\n",
+                               disk->disk_name, p, -PTR_ERR(part));
+                        continue;
+                }
+#ifdef CONFIG_BLK_DEV_MD
+                if (state->parts[p].flags & ADDPART_FLAG_RAID)
+                        md_autodetect_dev(part_to_dev(part)->devt);
+#endif
+        }
+        kfree(state);
+        return 0;
+}
+
+unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
+{
+        struct address_space *mapping = bdev->bd_inode->i_mapping;
+        struct page *page;
+
+        page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
+                                 NULL);
+        if (!IS_ERR(page)) {
+                if (PageError(page))
+                        goto fail;
+                p->v = page;
+                return (unsigned char *)page_address(page) +  ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
+fail:
+                page_cache_release(page);
+        }
+        p->v = NULL;
+        return NULL;
+}
+
+EXPORT_SYMBOL(read_dev_sector);
diff --git a/fs/partitions/check.h b/fs/partitions/check.h
new file mode 100644
index 00000000000..d68bf4dc3bc
--- /dev/null
+++ b/fs/partitions/check.h
@@ -0,0 +1,49 @@
+#include <linux/pagemap.h>
+#include <linux/blkdev.h>
+#include <linux/genhd.h>
+
+/*
+ * add_gd_partition adds a partitions details to the devices partition
+ * description.
+ */
+struct parsed_partitions {
+        struct block_device *bdev;
+        char name[BDEVNAME_SIZE];
+        struct {
+                sector_t from;
+                sector_t size;
+                int flags;
+                bool has_info;
+                struct partition_meta_info info;
+        } parts[DISK_MAX_PARTS];
+        int next;
+        int limit;
+        bool access_beyond_eod;
+        char *pp_buf;
+};
+
+static inline void *read_part_sector(struct parsed_partitions *state,
+                                     sector_t n, Sector *p)
+{
+        if (n >= get_capacity(state->bdev->bd_disk)) {
+                state->access_beyond_eod = true;
+                return NULL;
+        }
+        return read_dev_sector(state->bdev, n, p);
+}
+
+static inline void
+put_partition(struct parsed_partitions *p, int n, sector_t from, sector_t size)
+{
+        if (n < p->limit) {
+                char tmp[1 + BDEVNAME_SIZE + 10 + 1];
+
+                p->parts[n].from = from;
+                p->parts[n].size = size;
+                snprintf(tmp, sizeof(tmp), " %s%d", p->name, n);
+                strlcat(p->pp_buf, tmp, PAGE_SIZE);
+        }
+}
+
+extern int warn_no_part;
+
diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c
new file mode 100644
index 00000000000..30546cc8d03
--- /dev/null
+++ b/fs/partitions/efi.c
@@ -0,0 +1,686 @@
+/************************************************************
+ * EFI GUID Partition Table handling
+ *
+ * http://www.uefi.org/specs/
+ * http://www.intel.com/technology/efi/
+ *
+ * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
+ *   Copyright 2000,2001,2002,2004 Dell Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *
+ * TODO:
+ *
+ * Changelog:
+ * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com>
+ * - test for valid PMBR and valid PGPT before ever reading
+ *   AGPT, allow override with 'gpt' kernel command line option.
+ * - check for first/last_usable_lba outside of size of disk
+ *
+ * Tue  Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com>
+ * - Ported to 2.5.7-pre1 and 2.5.7-dj2
+ * - Applied patch to avoid fault in alternate header handling
+ * - cleaned up find_valid_gpt
+ * - On-disk structure and copy in memory is *always* LE now - 
+ *   swab fields as needed
+ * - remove print_gpt_header()
+ * - only use first max_p partition entries, to keep the kernel minor number
+ *   and partition numbers tied.
+ *
+ * Mon  Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com>
+ * - Removed __PRIPTR_PREFIX - not being used
+ *
+ * Mon  Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com>
+ * - Ported to 2.5.2-pre11 + library crc32 patch Linus applied
+ *
+ * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Added compare_gpts().
+ * - moved le_efi_guid_to_cpus() back into this file.  GPT is the only
+ *   thing that keeps EFI GUIDs on disk.
+ * - Changed gpt structure names and members to be simpler and more Linux-like.
+ * 
+ * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck
+ *
+ * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Changed function comments to DocBook style per Andreas Dilger suggestion.
+ *
+ * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Change read_lba() to use the page cache per Al Viro's work.
+ * - print u64s properly on all architectures
+ * - fixed debug_printk(), now Dprintk()
+ *
+ * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com>
+ * - Style cleanups
+ * - made most functions static
+ * - Endianness addition
+ * - remove test for second alternate header, as it's not per spec,
+ *   and is unnecessary.  There's now a method to read/write the last
+ *   sector of an odd-sized disk from user space.  No tools have ever
+ *   been released which used this code, so it's effectively dead.
+ * - Per Asit Mallick of Intel, added a test for a valid PMBR.
+ * - Added kernel command line option 'gpt' to override valid PMBR test.
+ *
+ * Wed Jun  6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com>
+ * - added devfs volume UUID support (/dev/volumes/uuids) for
+ *   mounting file systems by the partition GUID. 
+ *
+ * Tue Dec  5 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Moved crc32() to linux/lib, added efi_crc32().
+ *
+ * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Replaced Intel's CRC32 function with an equivalent
+ *   non-license-restricted version.
+ *
+ * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Fixed the last_lba() call to return the proper last block
+ *
+ * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com>
+ * - Thanks to Andries Brouwer for his debugging assistance.
+ * - Code works, detects all the partitions.
+ *
+ ************************************************************/
+#include <linux/crc32.h>
+#include <linux/ctype.h>
+#include <linux/math64.h>
+#include <linux/slab.h>
+#include "check.h"
+#include "efi.h"
+
+/* This allows a kernel command line option 'gpt' to override
+ * the test for invalid PMBR.  Not __initdata because reloading
+ * the partition tables happens after init too.
+ */
+static int force_gpt;
+static u64 force_gpt_sector;
+static int __init
+force_gpt_fn(char *str)
+{
+        force_gpt = 1;
+        return 1;
+}
+__setup("gpt", force_gpt_fn);
+
+static int __init force_gpt_sector_fn(char *str)
+{
+        force_gpt_sector = simple_strtoull(str, NULL, 0);
+        return 1;
+}
+__setup("gpt_sector=", force_gpt_sector_fn);
+
+
+/**
+ * efi_crc32() - EFI version of crc32 function
+ * @buf: buffer to calculate crc32 of
+ * @len - length of buf
+ *
+ * Description: Returns EFI-style CRC32 value for @buf
+ * 
+ * This function uses the little endian Ethernet polynomial
+ * but seeds the function with ~0, and xor's with ~0 at the end.
+ * Note, the EFI Specification, v1.02, has a reference to
+ * Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
+ */
+static inline u32
+efi_crc32(const void *buf, unsigned long len)
+{
+        return (crc32(~0L, buf, len) ^ ~0L);
+}
+
+/**
+ * last_lba(): return number of last logical block of device
+ * @bdev: block device
+ * 
+ * Description: Returns last LBA value on success, 0 on error.
+ * This is stored (by sd and ide-geometry) in
+ *  the part[0] entry for this disk, and is the number of
+ *  physical sectors available on the disk.
+ */
+static u64 last_lba(struct block_device *bdev)
+{
+        if (!bdev || !bdev->bd_inode)
+                return 0;
+        return div_u64(bdev->bd_inode->i_size,
+                       bdev_logical_block_size(bdev)) - 1ULL;
+}
+
+static inline int
+pmbr_part_valid(struct partition *part)
+{
+        if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
+            le32_to_cpu(part->start_sect) == 1UL)
+                return 1;
+        return 0;
+}
+
+/**
+ * is_pmbr_valid(): test Protective MBR for validity
+ * @mbr: pointer to a legacy mbr structure
+ *
+ * Description: Returns 1 if PMBR is valid, 0 otherwise.
+ * Validity depends on two things:
+ *  1) MSDOS signature is in the last two bytes of the MBR
+ *  2) One partition of type 0xEE is found
+ */
+static int
+is_pmbr_valid(legacy_mbr *mbr)
+{
+        int i;
+        if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
+                return 0;
+        for (i = 0; i < 4; i++)
+                if (pmbr_part_valid(&mbr->partition_record[i]))
+                        return 1;
+        return 0;
+}
+
+/**
+ * read_lba(): Read bytes from disk, starting at given LBA
+ * @state
+ * @lba
+ * @buffer
+ * @size_t
+ *
+ * Description: Reads @count bytes from @state->bdev into @buffer.
+ * Returns number of bytes read on success, 0 on error.
+ */
+static size_t read_lba(struct parsed_partitions *state,
+                       u64 lba, u8 *buffer, size_t count)
+{
+        size_t totalreadcount = 0;
+        struct block_device *bdev = state->bdev;
+        sector_t n = lba * (bdev_logical_block_size(bdev) / 512);
+
+        if (!buffer || lba > last_lba(bdev))
+                return 0;
+
+        while (count) {
+                int copied = 512;
+                Sector sect;
+                unsigned char *data = read_part_sector(state, n++, &sect);
+                if (!data)
+                        break;
+                if (copied > count)
+                        copied = count;
+                memcpy(buffer, data, copied);
+                put_dev_sector(sect);
+                buffer += copied;
+                totalreadcount +=copied;
+                count -= copied;
+        }
+        return totalreadcount;
+}
+
+/**
+ * alloc_read_gpt_entries(): reads partition entries from disk
+ * @state
+ * @gpt - GPT header
+ * 
+ * Description: Returns ptes on success,  NULL on error.
+ * Allocates space for PTEs based on information found in @gpt.
+ * Notes: remember to free pte when you're done!
+ */
+static gpt_entry *alloc_read_gpt_entries(struct parsed_partitions *state,
+                                         gpt_header *gpt)
+{
+        size_t count;
+        gpt_entry *pte;
+
+        if (!gpt)
+                return NULL;
+
+        count = le32_to_cpu(gpt->num_partition_entries) *
+                le32_to_cpu(gpt->sizeof_partition_entry);
+        if (!count)
+                return NULL;
+        pte = kzalloc(count, GFP_KERNEL);
+        if (!pte)
+                return NULL;
+
+        if (read_lba(state, le64_to_cpu(gpt->partition_entry_lba),
+                     (u8 *) pte,
+                     count) < count) {
+                kfree(pte);
+                pte=NULL;
+                return NULL;
+        }
+        return pte;
+}
+
+/**
+ * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
+ * @state
+ * @lba is the Logical Block Address of the partition table
+ * 
+ * Description: returns GPT header on success, NULL on error.   Allocates
+ * and fills a GPT header starting at @ from @state->bdev.
+ * Note: remember to free gpt when finished with it.
+ */
+static gpt_header *alloc_read_gpt_header(struct parsed_partitions *state,
+                                         u64 lba)
+{
+        gpt_header *gpt;
+        unsigned ssz = bdev_logical_block_size(state->bdev);
+
+        gpt = kzalloc(ssz, GFP_KERNEL);
+        if (!gpt)
+                return NULL;
+
+        if (read_lba(state, lba, (u8 *) gpt, ssz) < ssz) {
+                kfree(gpt);
+                gpt=NULL;
+                return NULL;
+        }
+
+        return gpt;
+}
+
+/**
+ * is_gpt_valid() - tests one GPT header and PTEs for validity
+ * @state
+ * @lba is the logical block address of the GPT header to test
+ * @gpt is a GPT header ptr, filled on return.
+ * @ptes is a PTEs ptr, filled on return.
+ *
+ * Description: returns 1 if valid,  0 on error.
+ * If valid, returns pointers to newly allocated GPT header and PTEs.
+ */
+static int is_gpt_valid(struct parsed_partitions *state, u64 lba,
+                        gpt_header **gpt, gpt_entry **ptes)
+{
+        u32 crc, origcrc;
+        u64 lastlba;
+
+        if (!ptes)
+                return 0;
+        if (!(*gpt = alloc_read_gpt_header(state, lba)))
+                return 0;
+
+        /* Check the GUID Partition Table signature */
+        if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
+                pr_debug("GUID Partition Table Header signature is wrong:"
+                         "%lld != %lld\n",
+                         (unsigned long long)le64_to_cpu((*gpt)->signature),
+                         (unsigned long long)GPT_HEADER_SIGNATURE);
+                goto fail;
+        }
+
+        /* Check the GUID Partition Table header size */
+        if (le32_to_cpu((*gpt)->header_size) >
+                        bdev_logical_block_size(state->bdev)) {
+                pr_debug("GUID Partition Table Header size is wrong: %u > %u\n",
+                        le32_to_cpu((*gpt)->header_size),
+                        bdev_logical_block_size(state->bdev));
+                goto fail;
+        }
+
+        /* Check the GUID Partition Table CRC */
+        origcrc = le32_to_cpu((*gpt)->header_crc32);
+        (*gpt)->header_crc32 = 0;
+        crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size));
+
+        if (crc != origcrc) {
+                pr_debug("GUID Partition Table Header CRC is wrong: %x != %x\n",
+                         crc, origcrc);
+                goto fail;
+        }
+        (*gpt)->header_crc32 = cpu_to_le32(origcrc);
+
+        /* Check that the my_lba entry points to the LBA that contains
+         * the GUID Partition Table */
+        if (le64_to_cpu((*gpt)->my_lba) != lba) {
+                pr_debug("GPT my_lba incorrect: %lld != %lld\n",
+                         (unsigned long long)le64_to_cpu((*gpt)->my_lba),
+                         (unsigned long long)lba);
+                goto fail;
+        }
+
+        /* Check the first_usable_lba and last_usable_lba are
+         * within the disk.
+         */
+        lastlba = last_lba(state->bdev);
+        if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
+                pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n",
+                         (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
+                         (unsigned long long)lastlba);
+                goto fail;
+        }
+        if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) {
+                pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",
+                         (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
+                         (unsigned long long)lastlba);
+                goto fail;
+        }
+
+        /* Check that sizeof_partition_entry has the correct value */
+        if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) {
+                pr_debug("GUID Partitition Entry Size check failed.\n");
+                goto fail;
+        }
+
+        if (!(*ptes = alloc_read_gpt_entries(state, *gpt)))
+                goto fail;
+
+        /* Check the GUID Partition Entry Array CRC */
+        crc = efi_crc32((const unsigned char *) (*ptes),
+                        le32_to_cpu((*gpt)->num_partition_entries) *
+                        le32_to_cpu((*gpt)->sizeof_partition_entry));
+
+        if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
+                pr_debug("GUID Partitition Entry Array CRC check failed.\n");
+                goto fail_ptes;
+        }
+
+        /* We're done, all's well */
+        return 1;
+
+ fail_ptes:
+        kfree(*ptes);
+        *ptes = NULL;
+ fail:
+        kfree(*gpt);
+        *gpt = NULL;
+        return 0;
+}
+
+/**
+ * is_pte_valid() - tests one PTE for validity
+ * @pte is the pte to check
+ * @lastlba is last lba of the disk
+ *
+ * Description: returns 1 if valid,  0 on error.
+ */
+static inline int
+is_pte_valid(const gpt_entry *pte, const u64 lastlba)
+{
+        if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) ||
+            le64_to_cpu(pte->starting_lba) > lastlba         ||
+            le64_to_cpu(pte->ending_lba)   > lastlba)
+                return 0;
+        return 1;
+}
+
+/**
+ * compare_gpts() - Search disk for valid GPT headers and PTEs
+ * @pgpt is the primary GPT header
+ * @agpt is the alternate GPT header
+ * @lastlba is the last LBA number
+ * Description: Returns nothing.  Sanity checks pgpt and agpt fields
+ * and prints warnings on discrepancies.
+ * 
+ */
+static void
+compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
+{
+        int error_found = 0;
+        if (!pgpt || !agpt)
+                return;
+        if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) {
+                printk(KERN_WARNING
+                       "GPT:Primary header LBA != Alt. header alternate_lba\n");
+                printk(KERN_WARNING "GPT:%lld != %lld\n",
+                       (unsigned long long)le64_to_cpu(pgpt->my_lba),
+                       (unsigned long long)le64_to_cpu(agpt->alternate_lba));
+                error_found++;
+        }
+        if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) {
+                printk(KERN_WARNING
+                       "GPT:Primary header alternate_lba != Alt. header my_lba\n");
+                printk(KERN_WARNING "GPT:%lld != %lld\n",
+                       (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
+                       (unsigned long long)le64_to_cpu(agpt->my_lba));
+                error_found++;
+        }
+        if (le64_to_cpu(pgpt->first_usable_lba) !=
+            le64_to_cpu(agpt->first_usable_lba)) {
+                printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n");
+                printk(KERN_WARNING "GPT:%lld != %lld\n",
+                       (unsigned long long)le64_to_cpu(pgpt->first_usable_lba),
+                       (unsigned long long)le64_to_cpu(agpt->first_usable_lba));
+                error_found++;
+        }
+        if (le64_to_cpu(pgpt->last_usable_lba) !=
+            le64_to_cpu(agpt->last_usable_lba)) {
+                printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n");
+                printk(KERN_WARNING "GPT:%lld != %lld\n",
+                       (unsigned long long)le64_to_cpu(pgpt->last_usable_lba),
+                       (unsigned long long)le64_to_cpu(agpt->last_usable_lba));
+                error_found++;
+        }
+        if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
+                printk(KERN_WARNING "GPT:disk_guids don't match.\n");
+                error_found++;
+        }
+        if (le32_to_cpu(pgpt->num_partition_entries) !=
+            le32_to_cpu(agpt->num_partition_entries)) {
+                printk(KERN_WARNING "GPT:num_partition_entries don't match: "
+                       "0x%x != 0x%x\n",
+                       le32_to_cpu(pgpt->num_partition_entries),
+                       le32_to_cpu(agpt->num_partition_entries));
+                error_found++;
+        }
+        if (le32_to_cpu(pgpt->sizeof_partition_entry) !=
+            le32_to_cpu(agpt->sizeof_partition_entry)) {
+                printk(KERN_WARNING
+                       "GPT:sizeof_partition_entry values don't match: "
+                       "0x%x != 0x%x\n",
+                       le32_to_cpu(pgpt->sizeof_partition_entry),
+                       le32_to_cpu(agpt->sizeof_partition_entry));
+                error_found++;
+        }
+        if (le32_to_cpu(pgpt->partition_entry_array_crc32) !=
+            le32_to_cpu(agpt->partition_entry_array_crc32)) {
+                printk(KERN_WARNING
+                       "GPT:partition_entry_array_crc32 values don't match: "
+                       "0x%x != 0x%x\n",
+                       le32_to_cpu(pgpt->partition_entry_array_crc32),
+                       le32_to_cpu(agpt->partition_entry_array_crc32));
+                error_found++;
+        }
+        if (le64_to_cpu(pgpt->alternate_lba) != lastlba) {
+                printk(KERN_WARNING
+                       "GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
+                printk(KERN_WARNING "GPT:%lld != %lld\n",
+                        (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
+                        (unsigned long long)lastlba);
+                error_found++;
+        }
+
+        if (le64_to_cpu(agpt->my_lba) != lastlba) {
+                printk(KERN_WARNING
+                       "GPT:Alternate GPT header not at the end of the disk.\n");
+                printk(KERN_WARNING "GPT:%lld != %lld\n",
+                        (unsigned long long)le64_to_cpu(agpt->my_lba),
+                        (unsigned long long)lastlba);
+                error_found++;
+        }
+
+        if (error_found)
+                printk(KERN_WARNING
+                       "GPT: Use GNU Parted to correct GPT errors.\n");
+        return;
+}
+
+/**
+ * find_valid_gpt() - Search disk for valid GPT headers and PTEs
+ * @state
+ * @gpt is a GPT header ptr, filled on return.
+ * @ptes is a PTEs ptr, filled on return.
+ * Description: Returns 1 if valid, 0 on error.
+ * If valid, returns pointers to newly allocated GPT header and PTEs.
+ * Validity depends on PMBR being valid (or being overridden by the
+ * 'gpt' kernel command line option) and finding either the Primary
+ * GPT header and PTEs valid, or the Alternate GPT header and PTEs
+ * valid.  If the Primary GPT header is not valid, the Alternate GPT header
+ * is not checked unless the 'gpt' kernel command line option is passed.
+ * This protects against devices which misreport their size, and forces
+ * the user to decide to use the Alternate GPT.
+ */
+static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
+                          gpt_entry **ptes)
+{
+        int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
+        gpt_header *pgpt = NULL, *agpt = NULL;
+        gpt_entry *pptes = NULL, *aptes = NULL;
+        legacy_mbr *legacymbr;
+        u64 lastlba;
+
+        if (!ptes)
+                return 0;
+
+        lastlba = last_lba(state->bdev);
+        if (!force_gpt) {
+                /* This will be added to the EFI Spec. per Intel after v1.02. */
+                legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL);
+                if (legacymbr) {
+                        read_lba(state, 0, (u8 *) legacymbr,
+                                 sizeof (*legacymbr));
+                        good_pmbr = is_pmbr_valid(legacymbr);
+                        kfree(legacymbr);
+                }
+                if (!good_pmbr)
+                        goto fail;
+        }
+
+        good_pgpt = is_gpt_valid(state, GPT_PRIMARY_PARTITION_TABLE_LBA,
+                                 &pgpt, &pptes);
+        if (good_pgpt)
+                good_agpt = is_gpt_valid(state,
+                                         le64_to_cpu(pgpt->alternate_lba),
+                                         &agpt, &aptes);
+        if (!good_agpt && force_gpt)
+                good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes);
+
+        if (!good_agpt && force_gpt && force_gpt_sector)
+                good_agpt = is_gpt_valid(state, force_gpt_sector, &agpt, &aptes);
+
+        /* The obviously unsuccessful case */
+        if (!good_pgpt && !good_agpt)
+                goto fail;
+
+        compare_gpts(pgpt, agpt, lastlba);
+
+        /* The good cases */
+        if (good_pgpt) {
+                *gpt  = pgpt;
+                *ptes = pptes;
+                kfree(agpt);
+                kfree(aptes);
+                if (!good_agpt) {
+                        printk(KERN_WARNING 
+                               "Alternate GPT is invalid, "
+                               "using primary GPT.\n");
+                }
+                return 1;
+        }
+        else if (good_agpt) {
+                *gpt  = agpt;
+                *ptes = aptes;
+                kfree(pgpt);
+                kfree(pptes);
+                printk(KERN_WARNING 
+                       "Primary GPT is invalid, using alternate GPT.\n");
+                return 1;
+        }
+
+ fail:
+        kfree(pgpt);
+        kfree(agpt);
+        kfree(pptes);
+        kfree(aptes);
+        *gpt = NULL;
+        *ptes = NULL;
+        return 0;
+}
+
+/**
+ * efi_partition(struct parsed_partitions *state)
+ * @state
+ *
+ * Description: called from check.c, if the disk contains GPT
+ * partitions, sets up partition entries in the kernel.
+ *
+ * If the first block on the disk is a legacy MBR,
+ * it will get handled by msdos_partition().
+ * If it's a Protective MBR, we'll handle it here.
+ *
+ * We do not create a Linux partition for GPT, but
+ * only for the actual data partitions.
+ * Returns:
+ * -1 if unable to read the partition table
+ *  0 if this isn't our partition table
+ *  1 if successful
+ *
+ */
+int efi_partition(struct parsed_partitions *state)
+{
+        gpt_header *gpt = NULL;
+        gpt_entry *ptes = NULL;
+        u32 i;
+        unsigned ssz = bdev_logical_block_size(state->bdev) / 512;
+        u8 unparsed_guid[37];
+
+        if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) {
+                kfree(gpt);
+                kfree(ptes);
+                return 0;
+        }
+
+        pr_debug("GUID Partition Table is valid!  Yea!\n");
+
+        for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {
+                struct partition_meta_info *info;
+                unsigned label_count = 0;
+                unsigned label_max;
+                u64 start = le64_to_cpu(ptes[i].starting_lba);
+                u64 size = le64_to_cpu(ptes[i].ending_lba) -
+                           le64_to_cpu(ptes[i].starting_lba) + 1ULL;
+
+                if (!is_pte_valid(&ptes[i], last_lba(state->bdev)))
+                        continue;
+
+                put_partition(state, i+1, start * ssz, size * ssz);
+
+                /* If this is a RAID volume, tell md */
+                if (!efi_guidcmp(ptes[i].partition_type_guid,
+                                 PARTITION_LINUX_RAID_GUID))
+                        state->parts[i + 1].flags = ADDPART_FLAG_RAID;
+
+                info = &state->parts[i + 1].info;
+                /* Instead of doing a manual swap to big endian, reuse the
+                 * common ASCII hex format as the interim.
+                 */
+                efi_guid_unparse(&ptes[i].unique_partition_guid, unparsed_guid);
+                part_pack_uuid(unparsed_guid, info->uuid);
+
+                /* Naively convert UTF16-LE to 7 bits. */
+                label_max = min(sizeof(info->volname) - 1,
+                                sizeof(ptes[i].partition_name));
+                info->volname[label_max] = 0;
+                while (label_count < label_max) {
+                        u8 c = ptes[i].partition_name[label_count] & 0xff;
+                        if (c && !isprint(c))
+                                c = '!';
+                        info->volname[label_count] = c;
+                        label_count++;
+                }
+                state->parts[i + 1].has_info = true;
+        }
+        kfree(ptes);
+        kfree(gpt);
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        return 1;
+}
diff --git a/fs/partitions/efi.h b/fs/partitions/efi.h
new file mode 100644
index 00000000000..b69ab729558
--- /dev/null
+++ b/fs/partitions/efi.h
@@ -0,0 +1,134 @@
+/************************************************************
+ * EFI GUID Partition Table
+ * Per Intel EFI Specification v1.02
+ * http://developer.intel.com/technology/efi/efi.htm
+ *
+ * By Matt Domsch <Matt_Domsch@dell.com>  Fri Sep 22 22:15:56 CDT 2000  
+ *   Copyright 2000,2001 Dell Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ ************************************************************/
+
+#ifndef FS_PART_EFI_H_INCLUDED
+#define FS_PART_EFI_H_INCLUDED
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/genhd.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/efi.h>
+
+#define MSDOS_MBR_SIGNATURE 0xaa55
+#define EFI_PMBR_OSTYPE_EFI 0xEF
+#define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
+
+#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
+#define GPT_HEADER_REVISION_V1 0x00010000
+#define GPT_PRIMARY_PARTITION_TABLE_LBA 1
+
+#define PARTITION_SYSTEM_GUID \
+    EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
+              0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B) 
+#define LEGACY_MBR_PARTITION_GUID \
+    EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
+              0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
+#define PARTITION_MSFT_RESERVED_GUID \
+    EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
+              0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
+#define PARTITION_BASIC_DATA_GUID \
+    EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
+              0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
+#define PARTITION_LINUX_RAID_GUID \
+    EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
+              0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
+#define PARTITION_LINUX_SWAP_GUID \
+    EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
+              0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
+#define PARTITION_LINUX_LVM_GUID \
+    EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
+              0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
+
+typedef struct _gpt_header {
+        __le64 signature;
+        __le32 revision;
+        __le32 header_size;
+        __le32 header_crc32;
+        __le32 reserved1;
+        __le64 my_lba;
+        __le64 alternate_lba;
+        __le64 first_usable_lba;
+        __le64 last_usable_lba;
+        efi_guid_t disk_guid;
+        __le64 partition_entry_lba;
+        __le32 num_partition_entries;
+        __le32 sizeof_partition_entry;
+        __le32 partition_entry_array_crc32;
+
+        /* The rest of the logical block is reserved by UEFI and must be zero.
+         * EFI standard handles this by:
+         *
+         * uint8_t              reserved2[ BlockSize - 92 ];
+         */
+} __attribute__ ((packed)) gpt_header;
+
+typedef struct _gpt_entry_attributes {
+        u64 required_to_function:1;
+        u64 reserved:47;
+        u64 type_guid_specific:16;
+} __attribute__ ((packed)) gpt_entry_attributes;
+
+typedef struct _gpt_entry {
+        efi_guid_t partition_type_guid;
+        efi_guid_t unique_partition_guid;
+        __le64 starting_lba;
+        __le64 ending_lba;
+        gpt_entry_attributes attributes;
+        efi_char16_t partition_name[72 / sizeof (efi_char16_t)];
+} __attribute__ ((packed)) gpt_entry;
+
+typedef struct _legacy_mbr {
+        u8 boot_code[440];
+        __le32 unique_mbr_signature;
+        __le16 unknown;
+        struct partition partition_record[4];
+        __le16 signature;
+} __attribute__ ((packed)) legacy_mbr;
+
+/* Functions */
+extern int efi_partition(struct parsed_partitions *state);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * --------------------------------------------------------------------------
+ * Local variables:
+ * c-indent-level: 4 
+ * c-brace-imaginary-offset: 0
+ * c-brace-offset: -4
+ * c-argdecl-indent: 4
+ * c-label-offset: -4
+ * c-continued-statement-offset: 4
+ * c-continued-brace-offset: 0
+ * indent-tabs-mode: nil
+ * tab-width: 8
+ * End:
+ */
diff --git a/fs/partitions/ibm.c b/fs/partitions/ibm.c
new file mode 100644
index 00000000000..d513a07f44b
--- /dev/null
+++ b/fs/partitions/ibm.c
@@ -0,0 +1,275 @@
+/*
+ * File...........: linux/fs/partitions/ibm.c
+ * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ *                  Volker Sameske <sameske@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/hdreg.h>
+#include <linux/slab.h>
+#include <asm/dasd.h>
+#include <asm/ebcdic.h>
+#include <asm/uaccess.h>
+#include <asm/vtoc.h>
+
+#include "check.h"
+#include "ibm.h"
+
+/*
+ * compute the block number from a
+ * cyl-cyl-head-head structure
+ */
+static sector_t
+cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
+
+        sector_t cyl;
+        __u16 head;
+
+        /*decode cylinder and heads for large volumes */
+        cyl = ptr->hh & 0xFFF0;
+        cyl <<= 12;
+        cyl |= ptr->cc;
+        head = ptr->hh & 0x000F;
+        return cyl * geo->heads * geo->sectors +
+               head * geo->sectors;
+}
+
+/*
+ * compute the block number from a
+ * cyl-cyl-head-head-block structure
+ */
+static sector_t
+cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
+
+        sector_t cyl;
+        __u16 head;
+
+        /*decode cylinder and heads for large volumes */
+        cyl = ptr->hh & 0xFFF0;
+        cyl <<= 12;
+        cyl |= ptr->cc;
+        head = ptr->hh & 0x000F;
+        return  cyl * geo->heads * geo->sectors +
+                head * geo->sectors +
+                ptr->b;
+}
+
+/*
+ */
+int ibm_partition(struct parsed_partitions *state)
+{
+        struct block_device *bdev = state->bdev;
+        int blocksize, res;
+        loff_t i_size, offset, size, fmt_size;
+        dasd_information2_t *info;
+        struct hd_geometry *geo;
+        char type[5] = {0,};
+        char name[7] = {0,};
+        union label_t {
+                struct vtoc_volume_label_cdl vol;
+                struct vtoc_volume_label_ldl lnx;
+                struct vtoc_cms_label cms;
+        } *label;
+        unsigned char *data;
+        Sector sect;
+        sector_t labelsect;
+        char tmp[64];
+
+        res = 0;
+        blocksize = bdev_logical_block_size(bdev);
+        if (blocksize <= 0)
+                goto out_exit;
+        i_size = i_size_read(bdev->bd_inode);
+        if (i_size == 0)
+                goto out_exit;
+
+        info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
+        if (info == NULL)
+                goto out_exit;
+        geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
+        if (geo == NULL)
+                goto out_nogeo;
+        label = kmalloc(sizeof(union label_t), GFP_KERNEL);
+        if (label == NULL)
+                goto out_nolab;
+
+        if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
+            ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
+                goto out_freeall;
+
+        /*
+         * Special case for FBA disks: label sector does not depend on
+         * blocksize.
+         */
+        if ((info->cu_type == 0x6310 && info->dev_type == 0x9336) ||
+            (info->cu_type == 0x3880 && info->dev_type == 0x3370))
+                labelsect = info->label_block;
+        else
+                labelsect = info->label_block * (blocksize >> 9);
+
+        /*
+         * Get volume label, extract name and type.
+         */
+        data = read_part_sector(state, labelsect, &sect);
+        if (data == NULL)
+                goto out_readerr;
+
+        memcpy(label, data, sizeof(union label_t));
+        put_dev_sector(sect);
+
+        if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
+                strncpy(type, label->vol.vollbl, 4);
+                strncpy(name, label->vol.volid, 6);
+        } else {
+                strncpy(type, label->lnx.vollbl, 4);
+                strncpy(name, label->lnx.volid, 6);
+        }
+        EBCASC(type, 4);
+        EBCASC(name, 6);
+
+        res = 1;
+
+        /*
+         * Three different formats: LDL, CDL and unformated disk
+         *
+         * identified by info->format
+         *
+         * unformated disks we do not have to care about
+         */
+        if (info->format == DASD_FORMAT_LDL) {
+                if (strncmp(type, "CMS1", 4) == 0) {
+                        /*
+                         * VM style CMS1 labeled disk
+                         */
+                        blocksize = label->cms.block_size;
+                        if (label->cms.disk_offset != 0) {
+                                snprintf(tmp, sizeof(tmp), "CMS1/%8s(MDSK):", name);
+                                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                                /* disk is reserved minidisk */
+                                offset = label->cms.disk_offset;
+                                size = (label->cms.block_count - 1)
+                                        * (blocksize >> 9);
+                        } else {
+                                snprintf(tmp, sizeof(tmp), "CMS1/%8s:", name);
+                                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                                offset = (info->label_block + 1);
+                                size = label->cms.block_count
+                                        * (blocksize >> 9);
+                        }
+                        put_partition(state, 1, offset*(blocksize >> 9),
+                                      size-offset*(blocksize >> 9));
+                } else {
+                        if (strncmp(type, "LNX1", 4) == 0) {
+                                snprintf(tmp, sizeof(tmp), "LNX1/%8s:", name);
+                                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                                if (label->lnx.ldl_version == 0xf2) {
+                                        fmt_size = label->lnx.formatted_blocks
+                                                * (blocksize >> 9);
+                                } else if (!strcmp(info->type, "ECKD")) {
+                                        /* formated w/o large volume support */
+                                        fmt_size = geo->cylinders * geo->heads
+                                              * geo->sectors * (blocksize >> 9);
+                                } else {
+                                        /* old label and no usable disk geometry
+                                         * (e.g. DIAG) */
+                                        fmt_size = i_size >> 9;
+                                }
+                                size = i_size >> 9;
+                                if (fmt_size < size)
+                                        size = fmt_size;
+                                offset = (info->label_block + 1);
+                        } else {
+                                /* unlabeled disk */
+                                strlcat(state->pp_buf, "(nonl)", PAGE_SIZE);
+                                size = i_size >> 9;
+                                offset = (info->label_block + 1);
+                        }
+                        put_partition(state, 1, offset*(blocksize >> 9),
+                                      size-offset*(blocksize >> 9));
+                }
+        } else if (info->format == DASD_FORMAT_CDL) {
+                /*
+                 * New style CDL formatted disk
+                 */
+                sector_t blk;
+                int counter;
+
+                /*
+                 * check if VOL1 label is available
+                 * if not, something is wrong, skipping partition detection
+                 */
+                if (strncmp(type, "VOL1",  4) == 0) {
+                        snprintf(tmp, sizeof(tmp), "VOL1/%8s:", name);
+                        strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                        /*
+                         * get block number and read then go through format1
+                         * labels
+                         */
+                        blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
+                        counter = 0;
+                        data = read_part_sector(state, blk * (blocksize/512),
+                                                &sect);
+                        while (data != NULL) {
+                                struct vtoc_format1_label f1;
+
+                                memcpy(&f1, data,
+                                       sizeof(struct vtoc_format1_label));
+                                put_dev_sector(sect);
+
+                                /* skip FMT4 / FMT5 / FMT7 labels */
+                                if (f1.DS1FMTID == _ascebc['4']
+                                    || f1.DS1FMTID == _ascebc['5']
+                                    || f1.DS1FMTID == _ascebc['7']
+                                    || f1.DS1FMTID == _ascebc['9']) {
+                                        blk++;
+                                        data = read_part_sector(state,
+                                                blk * (blocksize/512), &sect);
+                                        continue;
+                                }
+
+                                /* only FMT1 and 8 labels valid at this point */
+                                if (f1.DS1FMTID != _ascebc['1'] &&
+                                    f1.DS1FMTID != _ascebc['8'])
+                                        break;
+
+                                /* OK, we got valid partition data */
+                                offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
+                                size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
+                                        offset + geo->sectors;
+                                if (counter >= state->limit)
+                                        break;
+                                put_partition(state, counter + 1,
+                                              offset * (blocksize >> 9),
+                                              size * (blocksize >> 9));
+                                counter++;
+                                blk++;
+                                data = read_part_sector(state,
+                                                blk * (blocksize/512), &sect);
+                        }
+
+                        if (!data)
+                                /* Are we not supposed to report this ? */
+                                goto out_readerr;
+                } else
+                        printk(KERN_WARNING "Warning, expected Label VOL1 not "
+                               "found, treating as CDL formated Disk");
+
+        }
+
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        goto out_freeall;
+
+
+out_readerr:
+        res = -1;
+out_freeall:
+        kfree(label);
+out_nolab:
+        kfree(geo);
+out_nogeo:
+        kfree(info);
+out_exit:
+        return res;
+}
diff --git a/fs/partitions/ibm.h b/fs/partitions/ibm.h
new file mode 100644
index 00000000000..08fb0804a81
--- /dev/null
+++ b/fs/partitions/ibm.h
@@ -0,0 +1 @@
+int ibm_partition(struct parsed_partitions *);
diff --git a/fs/partitions/karma.c b/fs/partitions/karma.c
new file mode 100644
index 00000000000..0ea19312706
--- /dev/null
+++ b/fs/partitions/karma.c
@@ -0,0 +1,57 @@
+/*
+ *  fs/partitions/karma.c
+ *  Rio Karma partition info.
+ *
+ *  Copyright (C) 2006 Bob Copeland (me@bobcopeland.com)
+ *  based on osf.c
+ */
+
+#include "check.h"
+#include "karma.h"
+
+int karma_partition(struct parsed_partitions *state)
+{
+        int i;
+        int slot = 1;
+        Sector sect;
+        unsigned char *data;
+        struct disklabel {
+                u8 d_reserved[270];
+                struct d_partition {
+                        __le32 p_res;
+                        u8 p_fstype;
+                        u8 p_res2[3];
+                        __le32 p_offset;
+                        __le32 p_size;
+                } d_partitions[2];
+                u8 d_blank[208];
+                __le16 d_magic;
+        } __attribute__((packed)) *label;
+        struct d_partition *p;
+
+        data = read_part_sector(state, 0, &sect);
+        if (!data)
+                return -1;
+
+        label = (struct disklabel *)data;
+        if (le16_to_cpu(label->d_magic) != KARMA_LABEL_MAGIC) {
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        p = label->d_partitions;
+        for (i = 0 ; i < 2; i++, p++) {
+                if (slot == state->limit)
+                        break;
+
+                if (p->p_fstype == 0x4d && le32_to_cpu(p->p_size)) {
+                        put_partition(state, slot, le32_to_cpu(p->p_offset),
+                                le32_to_cpu(p->p_size));
+                }
+                slot++;
+        }
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        put_dev_sector(sect);
+        return 1;
+}
+
diff --git a/fs/partitions/karma.h b/fs/partitions/karma.h
new file mode 100644
index 00000000000..c764b2e9df2
--- /dev/null
+++ b/fs/partitions/karma.h
@@ -0,0 +1,8 @@
+/*
+ *  fs/partitions/karma.h
+ */
+
+#define KARMA_LABEL_MAGIC               0xAB56
+
+int karma_partition(struct parsed_partitions *state);
+
diff --git a/fs/partitions/ldm.c b/fs/partitions/ldm.c
new file mode 100644
index 00000000000..af9fdf04676
--- /dev/null
+++ b/fs/partitions/ldm.c
@@ -0,0 +1,1568 @@
+/**
+ * ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
+ *
+ * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
+ * Copyright (c) 2001-2007 Anton Altaparmakov
+ * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
+ *
+ * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads 
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program (in the main directory of the source in the file COPYING); if
+ * not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA  02111-1307  USA
+ */
+
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/stringify.h>
+#include <linux/kernel.h>
+#include "ldm.h"
+#include "check.h"
+#include "msdos.h"
+
+/**
+ * ldm_debug/info/error/crit - Output an error message
+ * @f:    A printf format string containing the message
+ * @...:  Variables to substitute into @f
+ *
+ * ldm_debug() writes a DEBUG level message to the syslog but only if the
+ * driver was compiled with debug enabled. Otherwise, the call turns into a NOP.
+ */
+#ifndef CONFIG_LDM_DEBUG
+#define ldm_debug(...)  do {} while (0)
+#else
+#define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __func__, f, ##a)
+#endif
+
+#define ldm_crit(f, a...)  _ldm_printk (KERN_CRIT,  __func__, f, ##a)
+#define ldm_error(f, a...) _ldm_printk (KERN_ERR,   __func__, f, ##a)
+#define ldm_info(f, a...)  _ldm_printk (KERN_INFO,  __func__, f, ##a)
+
+__attribute__ ((format (printf, 3, 4)))
+static void _ldm_printk (const char *level, const char *function,
+                         const char *fmt, ...)
+{
+        static char buf[128];
+        va_list args;
+
+        va_start (args, fmt);
+        vsnprintf (buf, sizeof (buf), fmt, args);
+        va_end (args);
+
+        printk ("%s%s(): %s\n", level, function, buf);
+}
+
+/**
+ * ldm_parse_hexbyte - Convert a ASCII hex number to a byte
+ * @src:  Pointer to at least 2 characters to convert.
+ *
+ * Convert a two character ASCII hex string to a number.
+ *
+ * Return:  0-255  Success, the byte was parsed correctly
+ *          -1     Error, an invalid character was supplied
+ */
+static int ldm_parse_hexbyte (const u8 *src)
+{
+        unsigned int x;         /* For correct wrapping */
+        int h;
+
+        /* high part */
+        x = h = hex_to_bin(src[0]);
+        if (h < 0)
+                return -1;
+
+        /* low part */
+        h = hex_to_bin(src[1]);
+        if (h < 0)
+                return -1;
+
+        return (x << 4) + h;
+}
+
+/**
+ * ldm_parse_guid - Convert GUID from ASCII to binary
+ * @src:   36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
+ * @dest:  Memory block to hold binary GUID (16 bytes)
+ *
+ * N.B. The GUID need not be NULL terminated.
+ *
+ * Return:  'true'   @dest contains binary GUID
+ *          'false'  @dest contents are undefined
+ */
+static bool ldm_parse_guid (const u8 *src, u8 *dest)
+{
+        static const int size[] = { 4, 2, 2, 2, 6 };
+        int i, j, v;
+
+        if (src[8]  != '-' || src[13] != '-' ||
+            src[18] != '-' || src[23] != '-')
+                return false;
+
+        for (j = 0; j < 5; j++, src++)
+                for (i = 0; i < size[j]; i++, src+=2, *dest++ = v)
+                        if ((v = ldm_parse_hexbyte (src)) < 0)
+                                return false;
+
+        return true;
+}
+
+/**
+ * ldm_parse_privhead - Read the LDM Database PRIVHEAD structure
+ * @data:  Raw database PRIVHEAD structure loaded from the device
+ * @ph:    In-memory privhead structure in which to return parsed information
+ *
+ * This parses the LDM database PRIVHEAD structure supplied in @data and
+ * sets up the in-memory privhead structure @ph with the obtained information.
+ *
+ * Return:  'true'   @ph contains the PRIVHEAD data
+ *          'false'  @ph contents are undefined
+ */
+static bool ldm_parse_privhead(const u8 *data, struct privhead *ph)
+{
+        bool is_vista = false;
+
+        BUG_ON(!data || !ph);
+        if (MAGIC_PRIVHEAD != get_unaligned_be64(data)) {
+                ldm_error("Cannot find PRIVHEAD structure. LDM database is"
+                        " corrupt. Aborting.");
+                return false;
+        }
+        ph->ver_major = get_unaligned_be16(data + 0x000C);
+        ph->ver_minor = get_unaligned_be16(data + 0x000E);
+        ph->logical_disk_start = get_unaligned_be64(data + 0x011B);
+        ph->logical_disk_size = get_unaligned_be64(data + 0x0123);
+        ph->config_start = get_unaligned_be64(data + 0x012B);
+        ph->config_size = get_unaligned_be64(data + 0x0133);
+        /* Version 2.11 is Win2k/XP and version 2.12 is Vista. */
+        if (ph->ver_major == 2 && ph->ver_minor == 12)
+                is_vista = true;
+        if (!is_vista && (ph->ver_major != 2 || ph->ver_minor != 11)) {
+                ldm_error("Expected PRIVHEAD version 2.11 or 2.12, got %d.%d."
+                        " Aborting.", ph->ver_major, ph->ver_minor);
+                return false;
+        }
+        ldm_debug("PRIVHEAD version %d.%d (Windows %s).", ph->ver_major,
+                        ph->ver_minor, is_vista ? "Vista" : "2000/XP");
+        if (ph->config_size != LDM_DB_SIZE) {   /* 1 MiB in sectors. */
+                /* Warn the user and continue, carefully. */
+                ldm_info("Database is normally %u bytes, it claims to "
+                        "be %llu bytes.", LDM_DB_SIZE,
+                        (unsigned long long)ph->config_size);
+        }
+        if ((ph->logical_disk_size == 0) || (ph->logical_disk_start +
+                        ph->logical_disk_size > ph->config_start)) {
+                ldm_error("PRIVHEAD disk size doesn't match real disk size");
+                return false;
+        }
+        if (!ldm_parse_guid(data + 0x0030, ph->disk_id)) {
+                ldm_error("PRIVHEAD contains an invalid GUID.");
+                return false;
+        }
+        ldm_debug("Parsed PRIVHEAD successfully.");
+        return true;
+}
+
+/**
+ * ldm_parse_tocblock - Read the LDM Database TOCBLOCK structure
+ * @data:  Raw database TOCBLOCK structure loaded from the device
+ * @toc:   In-memory toc structure in which to return parsed information
+ *
+ * This parses the LDM Database TOCBLOCK (table of contents) structure supplied
+ * in @data and sets up the in-memory tocblock structure @toc with the obtained
+ * information.
+ *
+ * N.B.  The *_start and *_size values returned in @toc are not range-checked.
+ *
+ * Return:  'true'   @toc contains the TOCBLOCK data
+ *          'false'  @toc contents are undefined
+ */
+static bool ldm_parse_tocblock (const u8 *data, struct tocblock *toc)
+{
+        BUG_ON (!data || !toc);
+
+        if (MAGIC_TOCBLOCK != get_unaligned_be64(data)) {
+                ldm_crit ("Cannot find TOCBLOCK, database may be corrupt.");
+                return false;
+        }
+        strncpy (toc->bitmap1_name, data + 0x24, sizeof (toc->bitmap1_name));
+        toc->bitmap1_name[sizeof (toc->bitmap1_name) - 1] = 0;
+        toc->bitmap1_start = get_unaligned_be64(data + 0x2E);
+        toc->bitmap1_size  = get_unaligned_be64(data + 0x36);
+
+        if (strncmp (toc->bitmap1_name, TOC_BITMAP1,
+                        sizeof (toc->bitmap1_name)) != 0) {
+                ldm_crit ("TOCBLOCK's first bitmap is '%s', should be '%s'.",
+                                TOC_BITMAP1, toc->bitmap1_name);
+                return false;
+        }
+        strncpy (toc->bitmap2_name, data + 0x46, sizeof (toc->bitmap2_name));
+        toc->bitmap2_name[sizeof (toc->bitmap2_name) - 1] = 0;
+        toc->bitmap2_start = get_unaligned_be64(data + 0x50);
+        toc->bitmap2_size  = get_unaligned_be64(data + 0x58);
+        if (strncmp (toc->bitmap2_name, TOC_BITMAP2,
+                        sizeof (toc->bitmap2_name)) != 0) {
+                ldm_crit ("TOCBLOCK's second bitmap is '%s', should be '%s'.",
+                                TOC_BITMAP2, toc->bitmap2_name);
+                return false;
+        }
+        ldm_debug ("Parsed TOCBLOCK successfully.");
+        return true;
+}
+
+/**
+ * ldm_parse_vmdb - Read the LDM Database VMDB structure
+ * @data:  Raw database VMDB structure loaded from the device
+ * @vm:    In-memory vmdb structure in which to return parsed information
+ *
+ * This parses the LDM Database VMDB structure supplied in @data and sets up
+ * the in-memory vmdb structure @vm with the obtained information.
+ *
+ * N.B.  The *_start, *_size and *_seq values will be range-checked later.
+ *
+ * Return:  'true'   @vm contains VMDB info
+ *          'false'  @vm contents are undefined
+ */
+static bool ldm_parse_vmdb (const u8 *data, struct vmdb *vm)
+{
+        BUG_ON (!data || !vm);
+
+        if (MAGIC_VMDB != get_unaligned_be32(data)) {
+                ldm_crit ("Cannot find the VMDB, database may be corrupt.");
+                return false;
+        }
+
+        vm->ver_major = get_unaligned_be16(data + 0x12);
+        vm->ver_minor = get_unaligned_be16(data + 0x14);
+        if ((vm->ver_major != 4) || (vm->ver_minor != 10)) {
+                ldm_error ("Expected VMDB version %d.%d, got %d.%d. "
+                        "Aborting.", 4, 10, vm->ver_major, vm->ver_minor);
+                return false;
+        }
+
+        vm->vblk_size     = get_unaligned_be32(data + 0x08);
+        if (vm->vblk_size == 0) {
+                ldm_error ("Illegal VBLK size");
+                return false;
+        }
+
+        vm->vblk_offset   = get_unaligned_be32(data + 0x0C);
+        vm->last_vblk_seq = get_unaligned_be32(data + 0x04);
+
+        ldm_debug ("Parsed VMDB successfully.");
+        return true;
+}
+
+/**
+ * ldm_compare_privheads - Compare two privhead objects
+ * @ph1:  First privhead
+ * @ph2:  Second privhead
+ *
+ * This compares the two privhead structures @ph1 and @ph2.
+ *
+ * Return:  'true'   Identical
+ *          'false'  Different
+ */
+static bool ldm_compare_privheads (const struct privhead *ph1,
+                                   const struct privhead *ph2)
+{
+        BUG_ON (!ph1 || !ph2);
+
+        return ((ph1->ver_major          == ph2->ver_major)             &&
+                (ph1->ver_minor          == ph2->ver_minor)             &&
+                (ph1->logical_disk_start == ph2->logical_disk_start)    &&
+                (ph1->logical_disk_size  == ph2->logical_disk_size)     &&
+                (ph1->config_start       == ph2->config_start)          &&
+                (ph1->config_size        == ph2->config_size)           &&
+                !memcmp (ph1->disk_id, ph2->disk_id, GUID_SIZE));
+}
+
+/**
+ * ldm_compare_tocblocks - Compare two tocblock objects
+ * @toc1:  First toc
+ * @toc2:  Second toc
+ *
+ * This compares the two tocblock structures @toc1 and @toc2.
+ *
+ * Return:  'true'   Identical
+ *          'false'  Different
+ */
+static bool ldm_compare_tocblocks (const struct tocblock *toc1,
+                                   const struct tocblock *toc2)
+{
+        BUG_ON (!toc1 || !toc2);
+
+        return ((toc1->bitmap1_start == toc2->bitmap1_start)    &&
+                (toc1->bitmap1_size  == toc2->bitmap1_size)     &&
+                (toc1->bitmap2_start == toc2->bitmap2_start)    &&
+                (toc1->bitmap2_size  == toc2->bitmap2_size)     &&
+                !strncmp (toc1->bitmap1_name, toc2->bitmap1_name,
+                        sizeof (toc1->bitmap1_name))            &&
+                !strncmp (toc1->bitmap2_name, toc2->bitmap2_name,
+                        sizeof (toc1->bitmap2_name)));
+}
+
+/**
+ * ldm_validate_privheads - Compare the primary privhead with its backups
+ * @state: Partition check state including device holding the LDM Database
+ * @ph1:   Memory struct to fill with ph contents
+ *
+ * Read and compare all three privheads from disk.
+ *
+ * The privheads on disk show the size and location of the main disk area and
+ * the configuration area (the database).  The values are range-checked against
+ * @hd, which contains the real size of the disk.
+ *
+ * Return:  'true'   Success
+ *          'false'  Error
+ */
+static bool ldm_validate_privheads(struct parsed_partitions *state,
+                                   struct privhead *ph1)
+{
+        static const int off[3] = { OFF_PRIV1, OFF_PRIV2, OFF_PRIV3 };
+        struct privhead *ph[3] = { ph1 };
+        Sector sect;
+        u8 *data;
+        bool result = false;
+        long num_sects;
+        int i;
+
+        BUG_ON (!state || !ph1);
+
+        ph[1] = kmalloc (sizeof (*ph[1]), GFP_KERNEL);
+        ph[2] = kmalloc (sizeof (*ph[2]), GFP_KERNEL);
+        if (!ph[1] || !ph[2]) {
+                ldm_crit ("Out of memory.");
+                goto out;
+        }
+
+        /* off[1 & 2] are relative to ph[0]->config_start */
+        ph[0]->config_start = 0;
+
+        /* Read and parse privheads */
+        for (i = 0; i < 3; i++) {
+                data = read_part_sector(state, ph[0]->config_start + off[i],
+                                        &sect);
+                if (!data) {
+                        ldm_crit ("Disk read failed.");
+                        goto out;
+                }
+                result = ldm_parse_privhead (data, ph[i]);
+                put_dev_sector (sect);
+                if (!result) {
+                        ldm_error ("Cannot find PRIVHEAD %d.", i+1); /* Log again */
+                        if (i < 2)
+                                goto out;       /* Already logged */
+                        else
+                                break;  /* FIXME ignore for now, 3rd PH can fail on odd-sized disks */
+                }
+        }
+
+        num_sects = state->bdev->bd_inode->i_size >> 9;
+
+        if ((ph[0]->config_start > num_sects) ||
+           ((ph[0]->config_start + ph[0]->config_size) > num_sects)) {
+                ldm_crit ("Database extends beyond the end of the disk.");
+                goto out;
+        }
+
+        if ((ph[0]->logical_disk_start > ph[0]->config_start) ||
+           ((ph[0]->logical_disk_start + ph[0]->logical_disk_size)
+                    > ph[0]->config_start)) {
+                ldm_crit ("Disk and database overlap.");
+                goto out;
+        }
+
+        if (!ldm_compare_privheads (ph[0], ph[1])) {
+                ldm_crit ("Primary and backup PRIVHEADs don't match.");
+                goto out;
+        }
+        /* FIXME ignore this for now
+        if (!ldm_compare_privheads (ph[0], ph[2])) {
+                ldm_crit ("Primary and backup PRIVHEADs don't match.");
+                goto out;
+        }*/
+        ldm_debug ("Validated PRIVHEADs successfully.");
+        result = true;
+out:
+        kfree (ph[1]);
+        kfree (ph[2]);
+        return result;
+}
+
+/**
+ * ldm_validate_tocblocks - Validate the table of contents and its backups
+ * @state: Partition check state including device holding the LDM Database
+ * @base:  Offset, into @state->bdev, of the database
+ * @ldb:   Cache of the database structures
+ *
+ * Find and compare the four tables of contents of the LDM Database stored on
+ * @state->bdev and return the parsed information into @toc1.
+ *
+ * The offsets and sizes of the configs are range-checked against a privhead.
+ *
+ * Return:  'true'   @toc1 contains validated TOCBLOCK info
+ *          'false'  @toc1 contents are undefined
+ */
+static bool ldm_validate_tocblocks(struct parsed_partitions *state,
+                                   unsigned long base, struct ldmdb *ldb)
+{
+        static const int off[4] = { OFF_TOCB1, OFF_TOCB2, OFF_TOCB3, OFF_TOCB4};
+        struct tocblock *tb[4];
+        struct privhead *ph;
+        Sector sect;
+        u8 *data;
+        int i, nr_tbs;
+        bool result = false;
+
+        BUG_ON(!state || !ldb);
+        ph = &ldb->ph;
+        tb[0] = &ldb->toc;
+        tb[1] = kmalloc(sizeof(*tb[1]) * 3, GFP_KERNEL);
+        if (!tb[1]) {
+                ldm_crit("Out of memory.");
+                goto err;
+        }
+        tb[2] = (struct tocblock*)((u8*)tb[1] + sizeof(*tb[1]));
+        tb[3] = (struct tocblock*)((u8*)tb[2] + sizeof(*tb[2]));
+        /*
+         * Try to read and parse all four TOCBLOCKs.
+         *
+         * Windows Vista LDM v2.12 does not always have all four TOCBLOCKs so
+         * skip any that fail as long as we get at least one valid TOCBLOCK.
+         */
+        for (nr_tbs = i = 0; i < 4; i++) {
+                data = read_part_sector(state, base + off[i], &sect);
+                if (!data) {
+                        ldm_error("Disk read failed for TOCBLOCK %d.", i);
+                        continue;
+                }
+                if (ldm_parse_tocblock(data, tb[nr_tbs]))
+                        nr_tbs++;
+                put_dev_sector(sect);
+        }
+        if (!nr_tbs) {
+                ldm_crit("Failed to find a valid TOCBLOCK.");
+                goto err;
+        }
+        /* Range check the TOCBLOCK against a privhead. */
+        if (((tb[0]->bitmap1_start + tb[0]->bitmap1_size) > ph->config_size) ||
+                        ((tb[0]->bitmap2_start + tb[0]->bitmap2_size) >
+                        ph->config_size)) {
+                ldm_crit("The bitmaps are out of range.  Giving up.");
+                goto err;
+        }
+        /* Compare all loaded TOCBLOCKs. */
+        for (i = 1; i < nr_tbs; i++) {
+                if (!ldm_compare_tocblocks(tb[0], tb[i])) {
+                        ldm_crit("TOCBLOCKs 0 and %d do not match.", i);
+                        goto err;
+                }
+        }
+        ldm_debug("Validated %d TOCBLOCKs successfully.", nr_tbs);
+        result = true;
+err:
+        kfree(tb[1]);
+        return result;
+}
+
+/**
+ * ldm_validate_vmdb - Read the VMDB and validate it
+ * @state: Partition check state including device holding the LDM Database
+ * @base:  Offset, into @bdev, of the database
+ * @ldb:   Cache of the database structures
+ *
+ * Find the vmdb of the LDM Database stored on @bdev and return the parsed
+ * information in @ldb.
+ *
+ * Return:  'true'   @ldb contains validated VBDB info
+ *          'false'  @ldb contents are undefined
+ */
+static bool ldm_validate_vmdb(struct parsed_partitions *state,
+                              unsigned long base, struct ldmdb *ldb)
+{
+        Sector sect;
+        u8 *data;
+        bool result = false;
+        struct vmdb *vm;
+        struct tocblock *toc;
+
+        BUG_ON (!state || !ldb);
+
+        vm  = &ldb->vm;
+        toc = &ldb->toc;
+
+        data = read_part_sector(state, base + OFF_VMDB, &sect);
+        if (!data) {
+                ldm_crit ("Disk read failed.");
+                return false;
+        }
+
+        if (!ldm_parse_vmdb (data, vm))
+                goto out;                               /* Already logged */
+
+        /* Are there uncommitted transactions? */
+        if (get_unaligned_be16(data + 0x10) != 0x01) {
+                ldm_crit ("Database is not in a consistent state.  Aborting.");
+                goto out;
+        }
+
+        if (vm->vblk_offset != 512)
+                ldm_info ("VBLKs start at offset 0x%04x.", vm->vblk_offset);
+
+        /*
+         * The last_vblkd_seq can be before the end of the vmdb, just make sure
+         * it is not out of bounds.
+         */
+        if ((vm->vblk_size * vm->last_vblk_seq) > (toc->bitmap1_size << 9)) {
+                ldm_crit ("VMDB exceeds allowed size specified by TOCBLOCK.  "
+                                "Database is corrupt.  Aborting.");
+                goto out;
+        }
+
+        result = true;
+out:
+        put_dev_sector (sect);
+        return result;
+}
+
+
+/**
+ * ldm_validate_partition_table - Determine whether bdev might be a dynamic disk
+ * @state: Partition check state including device holding the LDM Database
+ *
+ * This function provides a weak test to decide whether the device is a dynamic
+ * disk or not.  It looks for an MS-DOS-style partition table containing at
+ * least one partition of type 0x42 (formerly SFS, now used by Windows for
+ * dynamic disks).
+ *
+ * N.B.  The only possible error can come from the read_part_sector and that is
+ *       only likely to happen if the underlying device is strange.  If that IS
+ *       the case we should return zero to let someone else try.
+ *
+ * Return:  'true'   @state->bdev is a dynamic disk
+ *          'false'  @state->bdev is not a dynamic disk, or an error occurred
+ */
+static bool ldm_validate_partition_table(struct parsed_partitions *state)
+{
+        Sector sect;
+        u8 *data;
+        struct partition *p;
+        int i;
+        bool result = false;
+
+        BUG_ON(!state);
+
+        data = read_part_sector(state, 0, &sect);
+        if (!data) {
+                ldm_info ("Disk read failed.");
+                return false;
+        }
+
+        if (*(__le16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC))
+                goto out;
+
+        p = (struct partition*)(data + 0x01BE);
+        for (i = 0; i < 4; i++, p++)
+                if (SYS_IND (p) == LDM_PARTITION) {
+                        result = true;
+                        break;
+                }
+
+        if (result)
+                ldm_debug ("Found W2K dynamic disk partition type.");
+
+out:
+        put_dev_sector (sect);
+        return result;
+}
+
+/**
+ * ldm_get_disk_objid - Search a linked list of vblk's for a given Disk Id
+ * @ldb:  Cache of the database structures
+ *
+ * The LDM Database contains a list of all partitions on all dynamic disks.
+ * The primary PRIVHEAD, at the beginning of the physical disk, tells us
+ * the GUID of this disk.  This function searches for the GUID in a linked
+ * list of vblk's.
+ *
+ * Return:  Pointer, A matching vblk was found
+ *          NULL,    No match, or an error
+ */
+static struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb)
+{
+        struct list_head *item;
+
+        BUG_ON (!ldb);
+
+        list_for_each (item, &ldb->v_disk) {
+                struct vblk *v = list_entry (item, struct vblk, list);
+                if (!memcmp (v->vblk.disk.disk_id, ldb->ph.disk_id, GUID_SIZE))
+                        return v;
+        }
+
+        return NULL;
+}
+
+/**
+ * ldm_create_data_partitions - Create data partitions for this device
+ * @pp:   List of the partitions parsed so far
+ * @ldb:  Cache of the database structures
+ *
+ * The database contains ALL the partitions for ALL disk groups, so we need to
+ * filter out this specific disk. Using the disk's object id, we can find all
+ * the partitions in the database that belong to this disk.
+ *
+ * Add each partition in our database, to the parsed_partitions structure.
+ *
+ * N.B.  This function creates the partitions in the order it finds partition
+ *       objects in the linked list.
+ *
+ * Return:  'true'   Partition created
+ *          'false'  Error, probably a range checking problem
+ */
+static bool ldm_create_data_partitions (struct parsed_partitions *pp,
+                                        const struct ldmdb *ldb)
+{
+        struct list_head *item;
+        struct vblk *vb;
+        struct vblk *disk;
+        struct vblk_part *part;
+        int part_num = 1;
+
+        BUG_ON (!pp || !ldb);
+
+        disk = ldm_get_disk_objid (ldb);
+        if (!disk) {
+                ldm_crit ("Can't find the ID of this disk in the database.");
+                return false;
+        }
+
+        strlcat(pp->pp_buf, " [LDM]", PAGE_SIZE);
+
+        /* Create the data partitions */
+        list_for_each (item, &ldb->v_part) {
+                vb = list_entry (item, struct vblk, list);
+                part = &vb->vblk.part;
+
+                if (part->disk_id != disk->obj_id)
+                        continue;
+
+                put_partition (pp, part_num, ldb->ph.logical_disk_start +
+                                part->start, part->size);
+                part_num++;
+        }
+
+        strlcat(pp->pp_buf, "\n", PAGE_SIZE);
+        return true;
+}
+
+
+/**
+ * ldm_relative - Calculate the next relative offset
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @base:    Size of the previous fixed width fields
+ * @offset:  Cumulative size of the previous variable-width fields
+ *
+ * Because many of the VBLK fields are variable-width, it's necessary
+ * to calculate each offset based on the previous one and the length
+ * of the field it pointed to.
+ *
+ * Return:  -1 Error, the calculated offset exceeded the size of the buffer
+ *           n OK, a range-checked offset into buffer
+ */
+static int ldm_relative(const u8 *buffer, int buflen, int base, int offset)
+{
+
+        base += offset;
+        if (!buffer || offset < 0 || base > buflen) {
+                if (!buffer)
+                        ldm_error("!buffer");
+                if (offset < 0)
+                        ldm_error("offset (%d) < 0", offset);
+                if (base > buflen)
+                        ldm_error("base (%d) > buflen (%d)", base, buflen);
+                return -1;
+        }
+        if (base + buffer[base] >= buflen) {
+                ldm_error("base (%d) + buffer[base] (%d) >= buflen (%d)", base,
+                                buffer[base], buflen);
+                return -1;
+        }
+        return buffer[base] + offset + 1;
+}
+
+/**
+ * ldm_get_vnum - Convert a variable-width, big endian number, into cpu order
+ * @block:  Pointer to the variable-width number to convert
+ *
+ * Large numbers in the LDM Database are often stored in a packed format.  Each
+ * number is prefixed by a one byte width marker.  All numbers in the database
+ * are stored in big-endian byte order.  This function reads one of these
+ * numbers and returns the result
+ *
+ * N.B.  This function DOES NOT perform any range checking, though the most
+ *       it will read is eight bytes.
+ *
+ * Return:  n A number
+ *          0 Zero, or an error occurred
+ */
+static u64 ldm_get_vnum (const u8 *block)
+{
+        u64 tmp = 0;
+        u8 length;
+
+        BUG_ON (!block);
+
+        length = *block++;
+
+        if (length && length <= 8)
+                while (length--)
+                        tmp = (tmp << 8) | *block++;
+        else
+                ldm_error ("Illegal length %d.", length);
+
+        return tmp;
+}
+
+/**
+ * ldm_get_vstr - Read a length-prefixed string into a buffer
+ * @block:   Pointer to the length marker
+ * @buffer:  Location to copy string to
+ * @buflen:  Size of the output buffer
+ *
+ * Many of the strings in the LDM Database are not NULL terminated.  Instead
+ * they are prefixed by a one byte length marker.  This function copies one of
+ * these strings into a buffer.
+ *
+ * N.B.  This function DOES NOT perform any range checking on the input.
+ *       If the buffer is too small, the output will be truncated.
+ *
+ * Return:  0, Error and @buffer contents are undefined
+ *          n, String length in characters (excluding NULL)
+ *          buflen-1, String was truncated.
+ */
+static int ldm_get_vstr (const u8 *block, u8 *buffer, int buflen)
+{
+        int length;
+
+        BUG_ON (!block || !buffer);
+
+        length = block[0];
+        if (length >= buflen) {
+                ldm_error ("Truncating string %d -> %d.", length, buflen);
+                length = buflen - 1;
+        }
+        memcpy (buffer, block + 1, length);
+        buffer[length] = 0;
+        return length;
+}
+
+
+/**
+ * ldm_parse_cmp3 - Read a raw VBLK Component object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Component object (version 3) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Component VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_cmp3 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+        int r_objid, r_name, r_vstate, r_child, r_parent, r_stripe, r_cols, len;
+        struct vblk_comp *comp;
+
+        BUG_ON (!buffer || !vb);
+
+        r_objid  = ldm_relative (buffer, buflen, 0x18, 0);
+        r_name   = ldm_relative (buffer, buflen, 0x18, r_objid);
+        r_vstate = ldm_relative (buffer, buflen, 0x18, r_name);
+        r_child  = ldm_relative (buffer, buflen, 0x1D, r_vstate);
+        r_parent = ldm_relative (buffer, buflen, 0x2D, r_child);
+
+        if (buffer[0x12] & VBLK_FLAG_COMP_STRIPE) {
+                r_stripe = ldm_relative (buffer, buflen, 0x2E, r_parent);
+                r_cols   = ldm_relative (buffer, buflen, 0x2E, r_stripe);
+                len = r_cols;
+        } else {
+                r_stripe = 0;
+                r_cols   = 0;
+                len = r_parent;
+        }
+        if (len < 0)
+                return false;
+
+        len += VBLK_SIZE_CMP3;
+        if (len != get_unaligned_be32(buffer + 0x14))
+                return false;
+
+        comp = &vb->vblk.comp;
+        ldm_get_vstr (buffer + 0x18 + r_name, comp->state,
+                sizeof (comp->state));
+        comp->type      = buffer[0x18 + r_vstate];
+        comp->children  = ldm_get_vnum (buffer + 0x1D + r_vstate);
+        comp->parent_id = ldm_get_vnum (buffer + 0x2D + r_child);
+        comp->chunksize = r_stripe ? ldm_get_vnum (buffer+r_parent+0x2E) : 0;
+
+        return true;
+}
+
+/**
+ * ldm_parse_dgr3 - Read a raw VBLK Disk Group object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Disk Group object (version 3) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Disk Group VBLK
+ *          'false'  @vb contents are not defined
+ */
+static int ldm_parse_dgr3 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+        int r_objid, r_name, r_diskid, r_id1, r_id2, len;
+        struct vblk_dgrp *dgrp;
+
+        BUG_ON (!buffer || !vb);
+
+        r_objid  = ldm_relative (buffer, buflen, 0x18, 0);
+        r_name   = ldm_relative (buffer, buflen, 0x18, r_objid);
+        r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);
+
+        if (buffer[0x12] & VBLK_FLAG_DGR3_IDS) {
+                r_id1 = ldm_relative (buffer, buflen, 0x24, r_diskid);
+                r_id2 = ldm_relative (buffer, buflen, 0x24, r_id1);
+                len = r_id2;
+        } else {
+                r_id1 = 0;
+                r_id2 = 0;
+                len = r_diskid;
+        }
+        if (len < 0)
+                return false;
+
+        len += VBLK_SIZE_DGR3;
+        if (len != get_unaligned_be32(buffer + 0x14))
+                return false;
+
+        dgrp = &vb->vblk.dgrp;
+        ldm_get_vstr (buffer + 0x18 + r_name, dgrp->disk_id,
+                sizeof (dgrp->disk_id));
+        return true;
+}
+
+/**
+ * ldm_parse_dgr4 - Read a raw VBLK Disk Group object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Disk Group object (version 4) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Disk Group VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_dgr4 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+        char buf[64];
+        int r_objid, r_name, r_id1, r_id2, len;
+        struct vblk_dgrp *dgrp;
+
+        BUG_ON (!buffer || !vb);
+
+        r_objid  = ldm_relative (buffer, buflen, 0x18, 0);
+        r_name   = ldm_relative (buffer, buflen, 0x18, r_objid);
+
+        if (buffer[0x12] & VBLK_FLAG_DGR4_IDS) {
+                r_id1 = ldm_relative (buffer, buflen, 0x44, r_name);
+                r_id2 = ldm_relative (buffer, buflen, 0x44, r_id1);
+                len = r_id2;
+        } else {
+                r_id1 = 0;
+                r_id2 = 0;
+                len = r_name;
+        }
+        if (len < 0)
+                return false;
+
+        len += VBLK_SIZE_DGR4;
+        if (len != get_unaligned_be32(buffer + 0x14))
+                return false;
+
+        dgrp = &vb->vblk.dgrp;
+
+        ldm_get_vstr (buffer + 0x18 + r_objid, buf, sizeof (buf));
+        return true;
+}
+
+/**
+ * ldm_parse_dsk3 - Read a raw VBLK Disk object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Disk object (version 3) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Disk VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_dsk3 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+        int r_objid, r_name, r_diskid, r_altname, len;
+        struct vblk_disk *disk;
+
+        BUG_ON (!buffer || !vb);
+
+        r_objid   = ldm_relative (buffer, buflen, 0x18, 0);
+        r_name    = ldm_relative (buffer, buflen, 0x18, r_objid);
+        r_diskid  = ldm_relative (buffer, buflen, 0x18, r_name);
+        r_altname = ldm_relative (buffer, buflen, 0x18, r_diskid);
+        len = r_altname;
+        if (len < 0)
+                return false;
+
+        len += VBLK_SIZE_DSK3;
+        if (len != get_unaligned_be32(buffer + 0x14))
+                return false;
+
+        disk = &vb->vblk.disk;
+        ldm_get_vstr (buffer + 0x18 + r_diskid, disk->alt_name,
+                sizeof (disk->alt_name));
+        if (!ldm_parse_guid (buffer + 0x19 + r_name, disk->disk_id))
+                return false;
+
+        return true;
+}
+
+/**
+ * ldm_parse_dsk4 - Read a raw VBLK Disk object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Disk object (version 4) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Disk VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_dsk4 (const u8 *buffer, int buflen, struct vblk *vb)
+{
+        int r_objid, r_name, len;
+        struct vblk_disk *disk;
+
+        BUG_ON (!buffer || !vb);
+
+        r_objid = ldm_relative (buffer, buflen, 0x18, 0);
+        r_name  = ldm_relative (buffer, buflen, 0x18, r_objid);
+        len     = r_name;
+        if (len < 0)
+                return false;
+
+        len += VBLK_SIZE_DSK4;
+        if (len != get_unaligned_be32(buffer + 0x14))
+                return false;
+
+        disk = &vb->vblk.disk;
+        memcpy (disk->disk_id, buffer + 0x18 + r_name, GUID_SIZE);
+        return true;
+}
+
+/**
+ * ldm_parse_prt3 - Read a raw VBLK Partition object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Partition object (version 3) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Partition VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_prt3(const u8 *buffer, int buflen, struct vblk *vb)
+{
+        int r_objid, r_name, r_size, r_parent, r_diskid, r_index, len;
+        struct vblk_part *part;
+
+        BUG_ON(!buffer || !vb);
+        r_objid = ldm_relative(buffer, buflen, 0x18, 0);
+        if (r_objid < 0) {
+                ldm_error("r_objid %d < 0", r_objid);
+                return false;
+        }
+        r_name = ldm_relative(buffer, buflen, 0x18, r_objid);
+        if (r_name < 0) {
+                ldm_error("r_name %d < 0", r_name);
+                return false;
+        }
+        r_size = ldm_relative(buffer, buflen, 0x34, r_name);
+        if (r_size < 0) {
+                ldm_error("r_size %d < 0", r_size);
+                return false;
+        }
+        r_parent = ldm_relative(buffer, buflen, 0x34, r_size);
+        if (r_parent < 0) {
+                ldm_error("r_parent %d < 0", r_parent);
+                return false;
+        }
+        r_diskid = ldm_relative(buffer, buflen, 0x34, r_parent);
+        if (r_diskid < 0) {
+                ldm_error("r_diskid %d < 0", r_diskid);
+                return false;
+        }
+        if (buffer[0x12] & VBLK_FLAG_PART_INDEX) {
+                r_index = ldm_relative(buffer, buflen, 0x34, r_diskid);
+                if (r_index < 0) {
+                        ldm_error("r_index %d < 0", r_index);
+                        return false;
+                }
+                len = r_index;
+        } else {
+                r_index = 0;
+                len = r_diskid;
+        }
+        if (len < 0) {
+                ldm_error("len %d < 0", len);
+                return false;
+        }
+        len += VBLK_SIZE_PRT3;
+        if (len > get_unaligned_be32(buffer + 0x14)) {
+                ldm_error("len %d > BE32(buffer + 0x14) %d", len,
+                                get_unaligned_be32(buffer + 0x14));
+                return false;
+        }
+        part = &vb->vblk.part;
+        part->start = get_unaligned_be64(buffer + 0x24 + r_name);
+        part->volume_offset = get_unaligned_be64(buffer + 0x2C + r_name);
+        part->size = ldm_get_vnum(buffer + 0x34 + r_name);
+        part->parent_id = ldm_get_vnum(buffer + 0x34 + r_size);
+        part->disk_id = ldm_get_vnum(buffer + 0x34 + r_parent);
+        if (vb->flags & VBLK_FLAG_PART_INDEX)
+                part->partnum = buffer[0x35 + r_diskid];
+        else
+                part->partnum = 0;
+        return true;
+}
+
+/**
+ * ldm_parse_vol5 - Read a raw VBLK Volume object into a vblk structure
+ * @buffer:  Block of data being worked on
+ * @buflen:  Size of the block of data
+ * @vb:      In-memory vblk in which to return information
+ *
+ * Read a raw VBLK Volume object (version 5) into a vblk structure.
+ *
+ * Return:  'true'   @vb contains a Volume VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_vol5(const u8 *buffer, int buflen, struct vblk *vb)
+{
+        int r_objid, r_name, r_vtype, r_disable_drive_letter, r_child, r_size;
+        int r_id1, r_id2, r_size2, r_drive, len;
+        struct vblk_volu *volu;
+
+        BUG_ON(!buffer || !vb);
+        r_objid = ldm_relative(buffer, buflen, 0x18, 0);
+        if (r_objid < 0) {
+                ldm_error("r_objid %d < 0", r_objid);
+                return false;
+        }
+        r_name = ldm_relative(buffer, buflen, 0x18, r_objid);
+        if (r_name < 0) {
+                ldm_error("r_name %d < 0", r_name);
+                return false;
+        }
+        r_vtype = ldm_relative(buffer, buflen, 0x18, r_name);
+        if (r_vtype < 0) {
+                ldm_error("r_vtype %d < 0", r_vtype);
+                return false;
+        }
+        r_disable_drive_letter = ldm_relative(buffer, buflen, 0x18, r_vtype);
+        if (r_disable_drive_letter < 0) {
+                ldm_error("r_disable_drive_letter %d < 0",
+                                r_disable_drive_letter);
+                return false;
+        }
+        r_child = ldm_relative(buffer, buflen, 0x2D, r_disable_drive_letter);
+        if (r_child < 0) {
+                ldm_error("r_child %d < 0", r_child);
+                return false;
+        }
+        r_size = ldm_relative(buffer, buflen, 0x3D, r_child);
+        if (r_size < 0) {
+                ldm_error("r_size %d < 0", r_size);
+                return false;
+        }
+        if (buffer[0x12] & VBLK_FLAG_VOLU_ID1) {
+                r_id1 = ldm_relative(buffer, buflen, 0x52, r_size);
+                if (r_id1 < 0) {
+                        ldm_error("r_id1 %d < 0", r_id1);
+                        return false;
+                }
+        } else
+                r_id1 = r_size;
+        if (buffer[0x12] & VBLK_FLAG_VOLU_ID2) {
+                r_id2 = ldm_relative(buffer, buflen, 0x52, r_id1);
+                if (r_id2 < 0) {
+                        ldm_error("r_id2 %d < 0", r_id2);
+                        return false;
+                }
+        } else
+                r_id2 = r_id1;
+        if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE) {
+                r_size2 = ldm_relative(buffer, buflen, 0x52, r_id2);
+                if (r_size2 < 0) {
+                        ldm_error("r_size2 %d < 0", r_size2);
+                        return false;
+                }
+        } else
+                r_size2 = r_id2;
+        if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
+                r_drive = ldm_relative(buffer, buflen, 0x52, r_size2);
+                if (r_drive < 0) {
+                        ldm_error("r_drive %d < 0", r_drive);
+                        return false;
+                }
+        } else
+                r_drive = r_size2;
+        len = r_drive;
+        if (len < 0) {
+                ldm_error("len %d < 0", len);
+                return false;
+        }
+        len += VBLK_SIZE_VOL5;
+        if (len > get_unaligned_be32(buffer + 0x14)) {
+                ldm_error("len %d > BE32(buffer + 0x14) %d", len,
+                                get_unaligned_be32(buffer + 0x14));
+                return false;
+        }
+        volu = &vb->vblk.volu;
+        ldm_get_vstr(buffer + 0x18 + r_name, volu->volume_type,
+                        sizeof(volu->volume_type));
+        memcpy(volu->volume_state, buffer + 0x18 + r_disable_drive_letter,
+                        sizeof(volu->volume_state));
+        volu->size = ldm_get_vnum(buffer + 0x3D + r_child);
+        volu->partition_type = buffer[0x41 + r_size];
+        memcpy(volu->guid, buffer + 0x42 + r_size, sizeof(volu->guid));
+        if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
+                ldm_get_vstr(buffer + 0x52 + r_size, volu->drive_hint,
+                                sizeof(volu->drive_hint));
+        }
+        return true;
+}
+
+/**
+ * ldm_parse_vblk - Read a raw VBLK object into a vblk structure
+ * @buf:  Block of data being worked on
+ * @len:  Size of the block of data
+ * @vb:   In-memory vblk in which to return information
+ *
+ * Read a raw VBLK object into a vblk structure.  This function just reads the
+ * information common to all VBLK types, then delegates the rest of the work to
+ * helper functions: ldm_parse_*.
+ *
+ * Return:  'true'   @vb contains a VBLK
+ *          'false'  @vb contents are not defined
+ */
+static bool ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb)
+{
+        bool result = false;
+        int r_objid;
+
+        BUG_ON (!buf || !vb);
+
+        r_objid = ldm_relative (buf, len, 0x18, 0);
+        if (r_objid < 0) {
+                ldm_error ("VBLK header is corrupt.");
+                return false;
+        }
+
+        vb->flags  = buf[0x12];
+        vb->type   = buf[0x13];
+        vb->obj_id = ldm_get_vnum (buf + 0x18);
+        ldm_get_vstr (buf+0x18+r_objid, vb->name, sizeof (vb->name));
+
+        switch (vb->type) {
+                case VBLK_CMP3:  result = ldm_parse_cmp3 (buf, len, vb); break;
+                case VBLK_DSK3:  result = ldm_parse_dsk3 (buf, len, vb); break;
+                case VBLK_DSK4:  result = ldm_parse_dsk4 (buf, len, vb); break;
+                case VBLK_DGR3:  result = ldm_parse_dgr3 (buf, len, vb); break;
+                case VBLK_DGR4:  result = ldm_parse_dgr4 (buf, len, vb); break;
+                case VBLK_PRT3:  result = ldm_parse_prt3 (buf, len, vb); break;
+                case VBLK_VOL5:  result = ldm_parse_vol5 (buf, len, vb); break;
+        }
+
+        if (result)
+                ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.",
+                         (unsigned long long) vb->obj_id, vb->type);
+        else
+                ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).",
+                        (unsigned long long) vb->obj_id, vb->type);
+
+        return result;
+}
+
+
+/**
+ * ldm_ldmdb_add - Adds a raw VBLK entry to the ldmdb database
+ * @data:  Raw VBLK to add to the database
+ * @len:   Size of the raw VBLK
+ * @ldb:   Cache of the database structures
+ *
+ * The VBLKs are sorted into categories.  Partitions are also sorted by offset.
+ *
+ * N.B.  This function does not check the validity of the VBLKs.
+ *
+ * Return:  'true'   The VBLK was added
+ *          'false'  An error occurred
+ */
+static bool ldm_ldmdb_add (u8 *data, int len, struct ldmdb *ldb)
+{
+        struct vblk *vb;
+        struct list_head *item;
+
+        BUG_ON (!data || !ldb);
+
+        vb = kmalloc (sizeof (*vb), GFP_KERNEL);
+        if (!vb) {
+                ldm_crit ("Out of memory.");
+                return false;
+        }
+
+        if (!ldm_parse_vblk (data, len, vb)) {
+                kfree(vb);
+                return false;                   /* Already logged */
+        }
+
+        /* Put vblk into the correct list. */
+        switch (vb->type) {
+        case VBLK_DGR3:
+        case VBLK_DGR4:
+                list_add (&vb->list, &ldb->v_dgrp);
+                break;
+        case VBLK_DSK3:
+        case VBLK_DSK4:
+                list_add (&vb->list, &ldb->v_disk);
+                break;
+        case VBLK_VOL5:
+                list_add (&vb->list, &ldb->v_volu);
+                break;
+        case VBLK_CMP3:
+                list_add (&vb->list, &ldb->v_comp);
+                break;
+        case VBLK_PRT3:
+                /* Sort by the partition's start sector. */
+                list_for_each (item, &ldb->v_part) {
+                        struct vblk *v = list_entry (item, struct vblk, list);
+                        if ((v->vblk.part.disk_id == vb->vblk.part.disk_id) &&
+                            (v->vblk.part.start > vb->vblk.part.start)) {
+                                list_add_tail (&vb->list, &v->list);
+                                return true;
+                        }
+                }
+                list_add_tail (&vb->list, &ldb->v_part);
+                break;
+        }
+        return true;
+}
+
+/**
+ * ldm_frag_add - Add a VBLK fragment to a list
+ * @data:   Raw fragment to be added to the list
+ * @size:   Size of the raw fragment
+ * @frags:  Linked list of VBLK fragments
+ *
+ * Fragmented VBLKs may not be consecutive in the database, so they are placed
+ * in a list so they can be pieced together later.
+ *
+ * Return:  'true'   Success, the VBLK was added to the list
+ *          'false'  Error, a problem occurred
+ */
+static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags)
+{
+        struct frag *f;
+        struct list_head *item;
+        int rec, num, group;
+
+        BUG_ON (!data || !frags);
+
+        if (size < 2 * VBLK_SIZE_HEAD) {
+                ldm_error("Value of size is to small.");
+                return false;
+        }
+
+        group = get_unaligned_be32(data + 0x08);
+        rec   = get_unaligned_be16(data + 0x0C);
+        num   = get_unaligned_be16(data + 0x0E);
+        if ((num < 1) || (num > 4)) {
+                ldm_error ("A VBLK claims to have %d parts.", num);
+                return false;
+        }
+        if (rec >= num) {
+                ldm_error("REC value (%d) exceeds NUM value (%d)", rec, num);
+                return false;
+        }
+
+        list_for_each (item, frags) {
+                f = list_entry (item, struct frag, list);
+                if (f->group == group)
+                        goto found;
+        }
+
+        f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL);
+        if (!f) {
+                ldm_crit ("Out of memory.");
+                return false;
+        }
+
+        f->group = group;
+        f->num   = num;
+        f->rec   = rec;
+        f->map   = 0xFF << num;
+
+        list_add_tail (&f->list, frags);
+found:
+        if (rec >= f->num) {
+                ldm_error("REC value (%d) exceeds NUM value (%d)", rec, f->num);
+                return false;
+        }
+
+        if (f->map & (1 << rec)) {
+                ldm_error ("Duplicate VBLK, part %d.", rec);
+                f->map &= 0x7F;                 /* Mark the group as broken */
+                return false;
+        }
+
+        f->map |= (1 << rec);
+
+        data += VBLK_SIZE_HEAD;
+        size -= VBLK_SIZE_HEAD;
+
+        memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size);
+
+        return true;
+}
+
+/**
+ * ldm_frag_free - Free a linked list of VBLK fragments
+ * @list:  Linked list of fragments
+ *
+ * Free a linked list of VBLK fragments
+ *
+ * Return:  none
+ */
+static void ldm_frag_free (struct list_head *list)
+{
+        struct list_head *item, *tmp;
+
+        BUG_ON (!list);
+
+        list_for_each_safe (item, tmp, list)
+                kfree (list_entry (item, struct frag, list));
+}
+
+/**
+ * ldm_frag_commit - Validate fragmented VBLKs and add them to the database
+ * @frags:  Linked list of VBLK fragments
+ * @ldb:    Cache of the database structures
+ *
+ * Now that all the fragmented VBLKs have been collected, they must be added to
+ * the database for later use.
+ *
+ * Return:  'true'   All the fragments we added successfully
+ *          'false'  One or more of the fragments we invalid
+ */
+static bool ldm_frag_commit (struct list_head *frags, struct ldmdb *ldb)
+{
+        struct frag *f;
+        struct list_head *item;
+
+        BUG_ON (!frags || !ldb);
+
+        list_for_each (item, frags) {
+                f = list_entry (item, struct frag, list);
+
+                if (f->map != 0xFF) {
+                        ldm_error ("VBLK group %d is incomplete (0x%02x).",
+                                f->group, f->map);
+                        return false;
+                }
+
+                if (!ldm_ldmdb_add (f->data, f->num*ldb->vm.vblk_size, ldb))
+                        return false;           /* Already logged */
+        }
+        return true;
+}
+
+/**
+ * ldm_get_vblks - Read the on-disk database of VBLKs into memory
+ * @state: Partition check state including device holding the LDM Database
+ * @base:  Offset, into @state->bdev, of the database
+ * @ldb:   Cache of the database structures
+ *
+ * To use the information from the VBLKs, they need to be read from the disk,
+ * unpacked and validated.  We cache them in @ldb according to their type.
+ *
+ * Return:  'true'   All the VBLKs were read successfully
+ *          'false'  An error occurred
+ */
+static bool ldm_get_vblks(struct parsed_partitions *state, unsigned long base,
+                          struct ldmdb *ldb)
+{
+        int size, perbuf, skip, finish, s, v, recs;
+        u8 *data = NULL;
+        Sector sect;
+        bool result = false;
+        LIST_HEAD (frags);
+
+        BUG_ON(!state || !ldb);
+
+        size   = ldb->vm.vblk_size;
+        perbuf = 512 / size;
+        skip   = ldb->vm.vblk_offset >> 9;              /* Bytes to sectors */
+        finish = (size * ldb->vm.last_vblk_seq) >> 9;
+
+        for (s = skip; s < finish; s++) {               /* For each sector */
+                data = read_part_sector(state, base + OFF_VMDB + s, &sect);
+                if (!data) {
+                        ldm_crit ("Disk read failed.");
+                        goto out;
+                }
+
+                for (v = 0; v < perbuf; v++, data+=size) {  /* For each vblk */
+                        if (MAGIC_VBLK != get_unaligned_be32(data)) {
+                                ldm_error ("Expected to find a VBLK.");
+                                goto out;
+                        }
+
+                        recs = get_unaligned_be16(data + 0x0E); /* Number of records */
+                        if (recs == 1) {
+                                if (!ldm_ldmdb_add (data, size, ldb))
+                                        goto out;       /* Already logged */
+                        } else if (recs > 1) {
+                                if (!ldm_frag_add (data, size, &frags))
+                                        goto out;       /* Already logged */
+                        }
+                        /* else Record is not in use, ignore it. */
+                }
+                put_dev_sector (sect);
+                data = NULL;
+        }
+
+        result = ldm_frag_commit (&frags, ldb); /* Failures, already logged */
+out:
+        if (data)
+                put_dev_sector (sect);
+        ldm_frag_free (&frags);
+
+        return result;
+}
+
+/**
+ * ldm_free_vblks - Free a linked list of vblk's
+ * @lh:  Head of a linked list of struct vblk
+ *
+ * Free a list of vblk's and free the memory used to maintain the list.
+ *
+ * Return:  none
+ */
+static void ldm_free_vblks (struct list_head *lh)
+{
+        struct list_head *item, *tmp;
+
+        BUG_ON (!lh);
+
+        list_for_each_safe (item, tmp, lh)
+                kfree (list_entry (item, struct vblk, list));
+}
+
+
+/**
+ * ldm_partition - Find out whether a device is a dynamic disk and handle it
+ * @state: Partition check state including device holding the LDM Database
+ *
+ * This determines whether the device @bdev is a dynamic disk and if so creates
+ * the partitions necessary in the gendisk structure pointed to by @hd.
+ *
+ * We create a dummy device 1, which contains the LDM database, and then create
+ * each partition described by the LDM database in sequence as devices 2+. For
+ * example, if the device is hda, we would have: hda1: LDM database, hda2, hda3,
+ * and so on: the actual data containing partitions.
+ *
+ * Return:  1 Success, @state->bdev is a dynamic disk and we handled it
+ *          0 Success, @state->bdev is not a dynamic disk
+ *         -1 An error occurred before enough information had been read
+ *            Or @state->bdev is a dynamic disk, but it may be corrupted
+ */
+int ldm_partition(struct parsed_partitions *state)
+{
+        struct ldmdb  *ldb;
+        unsigned long base;
+        int result = -1;
+
+        BUG_ON(!state);
+
+        /* Look for signs of a Dynamic Disk */
+        if (!ldm_validate_partition_table(state))
+                return 0;
+
+        ldb = kmalloc (sizeof (*ldb), GFP_KERNEL);
+        if (!ldb) {
+                ldm_crit ("Out of memory.");
+                goto out;
+        }
+
+        /* Parse and check privheads. */
+        if (!ldm_validate_privheads(state, &ldb->ph))
+                goto out;               /* Already logged */
+
+        /* All further references are relative to base (database start). */
+        base = ldb->ph.config_start;
+
+        /* Parse and check tocs and vmdb. */
+        if (!ldm_validate_tocblocks(state, base, ldb) ||
+            !ldm_validate_vmdb(state, base, ldb))
+                goto out;               /* Already logged */
+
+        /* Initialize vblk lists in ldmdb struct */
+        INIT_LIST_HEAD (&ldb->v_dgrp);
+        INIT_LIST_HEAD (&ldb->v_disk);
+        INIT_LIST_HEAD (&ldb->v_volu);
+        INIT_LIST_HEAD (&ldb->v_comp);
+        INIT_LIST_HEAD (&ldb->v_part);
+
+        if (!ldm_get_vblks(state, base, ldb)) {
+                ldm_crit ("Failed to read the VBLKs from the database.");
+                goto cleanup;
+        }
+
+        /* Finally, create the data partition devices. */
+        if (ldm_create_data_partitions(state, ldb)) {
+                ldm_debug ("Parsed LDM database successfully.");
+                result = 1;
+        }
+        /* else Already logged */
+
+cleanup:
+        ldm_free_vblks (&ldb->v_dgrp);
+        ldm_free_vblks (&ldb->v_disk);
+        ldm_free_vblks (&ldb->v_volu);
+        ldm_free_vblks (&ldb->v_comp);
+        ldm_free_vblks (&ldb->v_part);
+out:
+        kfree (ldb);
+        return result;
+}
diff --git a/fs/partitions/ldm.h b/fs/partitions/ldm.h
new file mode 100644
index 00000000000..374242c0971
--- /dev/null
+++ b/fs/partitions/ldm.h
@@ -0,0 +1,215 @@
+/**
+ * ldm - Part of the Linux-NTFS project.
+ *
+ * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
+ * Copyright (c) 2001-2007 Anton Altaparmakov
+ * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
+ *
+ * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads 
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (in the main directory of the Linux-NTFS source
+ * in the file COPYING); if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _FS_PT_LDM_H_
+#define _FS_PT_LDM_H_
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/genhd.h>
+#include <linux/fs.h>
+#include <asm/unaligned.h>
+#include <asm/byteorder.h>
+
+struct parsed_partitions;
+
+/* Magic numbers in CPU format. */
+#define MAGIC_VMDB      0x564D4442              /* VMDB */
+#define MAGIC_VBLK      0x56424C4B              /* VBLK */
+#define MAGIC_PRIVHEAD  0x5052495648454144ULL   /* PRIVHEAD */
+#define MAGIC_TOCBLOCK  0x544F43424C4F434BULL   /* TOCBLOCK */
+
+/* The defined vblk types. */
+#define VBLK_VOL5               0x51            /* Volume,     version 5 */
+#define VBLK_CMP3               0x32            /* Component,  version 3 */
+#define VBLK_PRT3               0x33            /* Partition,  version 3 */
+#define VBLK_DSK3               0x34            /* Disk,       version 3 */
+#define VBLK_DSK4               0x44            /* Disk,       version 4 */
+#define VBLK_DGR3               0x35            /* Disk Group, version 3 */
+#define VBLK_DGR4               0x45            /* Disk Group, version 4 */
+
+/* vblk flags indicating extra information will be present */
+#define VBLK_FLAG_COMP_STRIPE   0x10
+#define VBLK_FLAG_PART_INDEX    0x08
+#define VBLK_FLAG_DGR3_IDS      0x08
+#define VBLK_FLAG_DGR4_IDS      0x08
+#define VBLK_FLAG_VOLU_ID1      0x08
+#define VBLK_FLAG_VOLU_ID2      0x20
+#define VBLK_FLAG_VOLU_SIZE     0x80
+#define VBLK_FLAG_VOLU_DRIVE    0x02
+
+/* size of a vblk's static parts */
+#define VBLK_SIZE_HEAD          16
+#define VBLK_SIZE_CMP3          22              /* Name and version */
+#define VBLK_SIZE_DGR3          12
+#define VBLK_SIZE_DGR4          44
+#define VBLK_SIZE_DSK3          12
+#define VBLK_SIZE_DSK4          45
+#define VBLK_SIZE_PRT3          28
+#define VBLK_SIZE_VOL5          58
+
+/* component types */
+#define COMP_STRIPE             0x01            /* Stripe-set */
+#define COMP_BASIC              0x02            /* Basic disk */
+#define COMP_RAID               0x03            /* Raid-set */
+
+/* Other constants. */
+#define LDM_DB_SIZE             2048            /* Size in sectors (= 1MiB). */
+
+#define OFF_PRIV1               6               /* Offset of the first privhead
+                                                   relative to the start of the
+                                                   device in sectors */
+
+/* Offsets to structures within the LDM Database in sectors. */
+#define OFF_PRIV2               1856            /* Backup private headers. */
+#define OFF_PRIV3               2047
+
+#define OFF_TOCB1               1               /* Tables of contents. */
+#define OFF_TOCB2               2
+#define OFF_TOCB3               2045
+#define OFF_TOCB4               2046
+
+#define OFF_VMDB                17              /* List of partitions. */
+
+#define LDM_PARTITION           0x42            /* Formerly SFS (Landis). */
+
+#define TOC_BITMAP1             "config"        /* Names of the two defined */
+#define TOC_BITMAP2             "log"           /* bitmaps in the TOCBLOCK. */
+
+/* Borrowed from msdos.c */
+#define SYS_IND(p)              (get_unaligned(&(p)->sys_ind))
+
+struct frag {                           /* VBLK Fragment handling */
+        struct list_head list;
+        u32             group;
+        u8              num;            /* Total number of records */
+        u8              rec;            /* This is record number n */
+        u8              map;            /* Which portions are in use */
+        u8              data[0];
+};
+
+/* In memory LDM database structures. */
+
+#define GUID_SIZE               16
+
+struct privhead {                       /* Offsets and sizes are in sectors. */
+        u16     ver_major;
+        u16     ver_minor;
+        u64     logical_disk_start;
+        u64     logical_disk_size;
+        u64     config_start;
+        u64     config_size;
+        u8      disk_id[GUID_SIZE];
+};
+
+struct tocblock {                       /* We have exactly two bitmaps. */
+        u8      bitmap1_name[16];
+        u64     bitmap1_start;
+        u64     bitmap1_size;
+        u8      bitmap2_name[16];
+        u64     bitmap2_start;
+        u64     bitmap2_size;
+};
+
+struct vmdb {                           /* VMDB: The database header */
+        u16     ver_major;
+        u16     ver_minor;
+        u32     vblk_size;
+        u32     vblk_offset;
+        u32     last_vblk_seq;
+};
+
+struct vblk_comp {                      /* VBLK Component */
+        u8      state[16];
+        u64     parent_id;
+        u8      type;
+        u8      children;
+        u16     chunksize;
+};
+
+struct vblk_dgrp {                      /* VBLK Disk Group */
+        u8      disk_id[64];
+};
+
+struct vblk_disk {                      /* VBLK Disk */
+        u8      disk_id[GUID_SIZE];
+        u8      alt_name[128];
+};
+
+struct vblk_part {                      /* VBLK Partition */
+        u64     start;
+        u64     size;                   /* start, size and vol_off in sectors */
+        u64     volume_offset;
+        u64     parent_id;
+        u64     disk_id;
+        u8      partnum;
+};
+
+struct vblk_volu {                      /* VBLK Volume */
+        u8      volume_type[16];
+        u8      volume_state[16];
+        u8      guid[16];
+        u8      drive_hint[4];
+        u64     size;
+        u8      partition_type;
+};
+
+struct vblk_head {                      /* VBLK standard header */
+        u32 group;
+        u16 rec;
+        u16 nrec;
+};
+
+struct vblk {                           /* Generalised VBLK */
+        u8      name[64];
+        u64     obj_id;
+        u32     sequence;
+        u8      flags;
+        u8      type;
+        union {
+                struct vblk_comp comp;
+                struct vblk_dgrp dgrp;
+                struct vblk_disk disk;
+                struct vblk_part part;
+                struct vblk_volu volu;
+        } vblk;
+        struct list_head list;
+};
+
+struct ldmdb {                          /* Cache of the database */
+        struct privhead ph;
+        struct tocblock toc;
+        struct vmdb     vm;
+        struct list_head v_dgrp;
+        struct list_head v_disk;
+        struct list_head v_volu;
+        struct list_head v_comp;
+        struct list_head v_part;
+};
+
+int ldm_partition(struct parsed_partitions *state);
+
+#endif /* _FS_PT_LDM_H_ */
+
diff --git a/fs/partitions/mac.c b/fs/partitions/mac.c
new file mode 100644
index 00000000000..11f688bd76c
--- /dev/null
+++ b/fs/partitions/mac.c
@@ -0,0 +1,134 @@
+/*
+ *  fs/partitions/mac.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/ctype.h>
+#include "check.h"
+#include "mac.h"
+
+#ifdef CONFIG_PPC_PMAC
+#include <asm/machdep.h>
+extern void note_bootable_part(dev_t dev, int part, int goodness);
+#endif
+
+/*
+ * Code to understand MacOS partition tables.
+ */
+
+static inline void mac_fix_string(char *stg, int len)
+{
+        int i;
+
+        for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
+                stg[i] = 0;
+}
+
+int mac_partition(struct parsed_partitions *state)
+{
+        Sector sect;
+        unsigned char *data;
+        int slot, blocks_in_map;
+        unsigned secsize;
+#ifdef CONFIG_PPC_PMAC
+        int found_root = 0;
+        int found_root_goodness = 0;
+#endif
+        struct mac_partition *part;
+        struct mac_driver_desc *md;
+
+        /* Get 0th block and look at the first partition map entry. */
+        md = read_part_sector(state, 0, &sect);
+        if (!md)
+                return -1;
+        if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
+                put_dev_sector(sect);
+                return 0;
+        }
+        secsize = be16_to_cpu(md->block_size);
+        put_dev_sector(sect);
+        data = read_part_sector(state, secsize/512, &sect);
+        if (!data)
+                return -1;
+        part = (struct mac_partition *) (data + secsize%512);
+        if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
+                put_dev_sector(sect);
+                return 0;               /* not a MacOS disk */
+        }
+        blocks_in_map = be32_to_cpu(part->map_count);
+        if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) {
+                put_dev_sector(sect);
+                return 0;
+        }
+        strlcat(state->pp_buf, " [mac]", PAGE_SIZE);
+        for (slot = 1; slot <= blocks_in_map; ++slot) {
+                int pos = slot * secsize;
+                put_dev_sector(sect);
+                data = read_part_sector(state, pos/512, &sect);
+                if (!data)
+                        return -1;
+                part = (struct mac_partition *) (data + pos%512);
+                if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
+                        break;
+                put_partition(state, slot,
+                        be32_to_cpu(part->start_block) * (secsize/512),
+                        be32_to_cpu(part->block_count) * (secsize/512));
+
+                if (!strnicmp(part->type, "Linux_RAID", 10))
+                        state->parts[slot].flags = ADDPART_FLAG_RAID;
+#ifdef CONFIG_PPC_PMAC
+                /*
+                 * If this is the first bootable partition, tell the
+                 * setup code, in case it wants to make this the root.
+                 */
+                if (machine_is(powermac)) {
+                        int goodness = 0;
+
+                        mac_fix_string(part->processor, 16);
+                        mac_fix_string(part->name, 32);
+                        mac_fix_string(part->type, 32);                                 
+                    
+                        if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
+                            && strcasecmp(part->processor, "powerpc") == 0)
+                                goodness++;
+
+                        if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
+                            || (strnicmp(part->type, "Linux", 5) == 0
+                                && strcasecmp(part->type, "Linux_swap") != 0)) {
+                                int i, l;
+
+                                goodness++;
+                                l = strlen(part->name);
+                                if (strcmp(part->name, "/") == 0)
+                                        goodness++;
+                                for (i = 0; i <= l - 4; ++i) {
+                                        if (strnicmp(part->name + i, "root",
+                                                     4) == 0) {
+                                                goodness += 2;
+                                                break;
+                                        }
+                                }
+                                if (strnicmp(part->name, "swap", 4) == 0)
+                                        goodness--;
+                        }
+
+                        if (goodness > found_root_goodness) {
+                                found_root = slot;
+                                found_root_goodness = goodness;
+                        }
+                }
+#endif /* CONFIG_PPC_PMAC */
+        }
+#ifdef CONFIG_PPC_PMAC
+        if (found_root_goodness)
+                note_bootable_part(state->bdev->bd_dev, found_root,
+                                   found_root_goodness);
+#endif
+
+        put_dev_sector(sect);
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        return 1;
+}
diff --git a/fs/partitions/mac.h b/fs/partitions/mac.h
new file mode 100644
index 00000000000..3c7d9843638
--- /dev/null
+++ b/fs/partitions/mac.h
@@ -0,0 +1,44 @@
+/*
+ *  fs/partitions/mac.h
+ */
+
+#define MAC_PARTITION_MAGIC     0x504d
+
+/* type field value for A/UX or other Unix partitions */
+#define APPLE_AUX_TYPE  "Apple_UNIX_SVR2"
+
+struct mac_partition {
+        __be16  signature;      /* expected to be MAC_PARTITION_MAGIC */
+        __be16  res1;
+        __be32  map_count;      /* # blocks in partition map */
+        __be32  start_block;    /* absolute starting block # of partition */
+        __be32  block_count;    /* number of blocks in partition */
+        char    name[32];       /* partition name */
+        char    type[32];       /* string type description */
+        __be32  data_start;     /* rel block # of first data block */
+        __be32  data_count;     /* number of data blocks */
+        __be32  status;         /* partition status bits */
+        __be32  boot_start;
+        __be32  boot_size;
+        __be32  boot_load;
+        __be32  boot_load2;
+        __be32  boot_entry;
+        __be32  boot_entry2;
+        __be32  boot_cksum;
+        char    processor[16];  /* identifies ISA of boot */
+        /* there is more stuff after this that we don't need */
+};
+
+#define MAC_STATUS_BOOTABLE     8       /* partition is bootable */
+
+#define MAC_DRIVER_MAGIC        0x4552
+
+/* Driver descriptor structure, in block 0 */
+struct mac_driver_desc {
+        __be16  signature;      /* expected to be MAC_DRIVER_MAGIC */
+        __be16  block_size;
+        __be32  block_count;
+    /* ... more stuff */
+};
+
+int mac_partition(struct parsed_partitions *state);
diff --git a/fs/partitions/msdos.c b/fs/partitions/msdos.c
new file mode 100644
index 00000000000..5f79a6677c6
--- /dev/null
+++ b/fs/partitions/msdos.c
@@ -0,0 +1,552 @@
+/*
+ *  fs/partitions/msdos.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *
+ *  Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
+ *  in the early extended-partition checks and added DM partitions
+ *
+ *  Support for DiskManager v6.0x added by Mark Lord,
+ *  with information provided by OnTrack.  This now works for linux fdisk
+ *  and LILO, as well as loadlin and bootln.  Note that disks other than
+ *  /dev/hda *must* have a "DOS" type 0x51 partition in the first slot (hda1).
+ *
+ *  More flexible handling of extended partitions - aeb, 950831
+ *
+ *  Check partition table on IDE disks for common CHS translations
+ *
+ *  Re-organised Feb 1998 Russell King
+ */
+#include <linux/msdos_fs.h>
+
+#include "check.h"
+#include "msdos.h"
+#include "efi.h"
+
+/*
+ * Many architectures don't like unaligned accesses, while
+ * the nr_sects and start_sect partition table entries are
+ * at a 2 (mod 4) address.
+ */
+#include <asm/unaligned.h>
+
+#define SYS_IND(p)      get_unaligned(&p->sys_ind)
+
+static inline sector_t nr_sects(struct partition *p)
+{
+        return (sector_t)get_unaligned_le32(&p->nr_sects);
+}
+
+static inline sector_t start_sect(struct partition *p)
+{
+        return (sector_t)get_unaligned_le32(&p->start_sect);
+}
+
+static inline int is_extended_partition(struct partition *p)
+{
+        return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
+                SYS_IND(p) == WIN98_EXTENDED_PARTITION ||
+                SYS_IND(p) == LINUX_EXTENDED_PARTITION);
+}
+
+#define MSDOS_LABEL_MAGIC1      0x55
+#define MSDOS_LABEL_MAGIC2      0xAA
+
+static inline int
+msdos_magic_present(unsigned char *p)
+{
+        return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2);
+}
+
+/* Value is EBCDIC 'IBMA' */
+#define AIX_LABEL_MAGIC1        0xC9
+#define AIX_LABEL_MAGIC2        0xC2
+#define AIX_LABEL_MAGIC3        0xD4
+#define AIX_LABEL_MAGIC4        0xC1
+static int aix_magic_present(struct parsed_partitions *state, unsigned char *p)
+{
+        struct partition *pt = (struct partition *) (p + 0x1be);
+        Sector sect;
+        unsigned char *d;
+        int slot, ret = 0;
+
+        if (!(p[0] == AIX_LABEL_MAGIC1 &&
+                p[1] == AIX_LABEL_MAGIC2 &&
+                p[2] == AIX_LABEL_MAGIC3 &&
+                p[3] == AIX_LABEL_MAGIC4))
+                return 0;
+        /* Assume the partition table is valid if Linux partitions exists */
+        for (slot = 1; slot <= 4; slot++, pt++) {
+                if (pt->sys_ind == LINUX_SWAP_PARTITION ||
+                        pt->sys_ind == LINUX_RAID_PARTITION ||
+                        pt->sys_ind == LINUX_DATA_PARTITION ||
+                        pt->sys_ind == LINUX_LVM_PARTITION ||
+                        is_extended_partition(pt))
+                        return 0;
+        }
+        d = read_part_sector(state, 7, &sect);
+        if (d) {
+                if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M')
+                        ret = 1;
+                put_dev_sector(sect);
+        };
+        return ret;
+}
+
+/*
+ * Create devices for each logical partition in an extended partition.
+ * The logical partitions form a linked list, with each entry being
+ * a partition table with two entries.  The first entry
+ * is the real data partition (with a start relative to the partition
+ * table start).  The second is a pointer to the next logical partition
+ * (with a start relative to the entire extended partition).
+ * We do not create a Linux partition for the partition tables, but
+ * only for the actual data partitions.
+ */
+
+static void parse_extended(struct parsed_partitions *state,
+                           sector_t first_sector, sector_t first_size)
+{
+        struct partition *p;
+        Sector sect;
+        unsigned char *data;
+        sector_t this_sector, this_size;
+        sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
+        int loopct = 0;         /* number of links followed
+                                   without finding a data partition */
+        int i;
+
+        this_sector = first_sector;
+        this_size = first_size;
+
+        while (1) {
+                if (++loopct > 100)
+                        return;
+                if (state->next == state->limit)
+                        return;
+                data = read_part_sector(state, this_sector, &sect);
+                if (!data)
+                        return;
+
+                if (!msdos_magic_present(data + 510))
+                        goto done; 
+
+                p = (struct partition *) (data + 0x1be);
+
+                /*
+                 * Usually, the first entry is the real data partition,
+                 * the 2nd entry is the next extended partition, or empty,
+                 * and the 3rd and 4th entries are unused.
+                 * However, DRDOS sometimes has the extended partition as
+                 * the first entry (when the data partition is empty),
+                 * and OS/2 seems to use all four entries.
+                 */
+
+                /* 
+                 * First process the data partition(s)
+                 */
+                for (i=0; i<4; i++, p++) {
+                        sector_t offs, size, next;
+                        if (!nr_sects(p) || is_extended_partition(p))
+                                continue;
+
+                        /* Check the 3rd and 4th entries -
+                           these sometimes contain random garbage */
+                        offs = start_sect(p)*sector_size;
+                        size = nr_sects(p)*sector_size;
+                        next = this_sector + offs;
+                        if (i >= 2) {
+                                if (offs + size > this_size)
+                                        continue;
+                                if (next < first_sector)
+                                        continue;
+                                if (next + size > first_sector + first_size)
+                                        continue;
+                        }
+
+                        put_partition(state, state->next, next, size);
+                        if (SYS_IND(p) == LINUX_RAID_PARTITION)
+                                state->parts[state->next].flags = ADDPART_FLAG_RAID;
+                        loopct = 0;
+                        if (++state->next == state->limit)
+                                goto done;
+                }
+                /*
+                 * Next, process the (first) extended partition, if present.
+                 * (So far, there seems to be no reason to make
+                 *  parse_extended()  recursive and allow a tree
+                 *  of extended partitions.)
+                 * It should be a link to the next logical partition.
+                 */
+                p -= 4;
+                for (i=0; i<4; i++, p++)
+                        if (nr_sects(p) && is_extended_partition(p))
+                                break;
+                if (i == 4)
+                        goto done;       /* nothing left to do */
+
+                this_sector = first_sector + start_sect(p) * sector_size;
+                this_size = nr_sects(p) * sector_size;
+                put_dev_sector(sect);
+        }
+done:
+        put_dev_sector(sect);
+}
+
+/* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also
+   indicates linux swap.  Be careful before believing this is Solaris. */
+
+static void parse_solaris_x86(struct parsed_partitions *state,
+                              sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_SOLARIS_X86_PARTITION
+        Sector sect;
+        struct solaris_x86_vtoc *v;
+        int i;
+        short max_nparts;
+
+        v = read_part_sector(state, offset + 1, &sect);
+        if (!v)
+                return;
+        if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) {
+                put_dev_sector(sect);
+                return;
+        }
+        {
+                char tmp[1 + BDEVNAME_SIZE + 10 + 11 + 1];
+
+                snprintf(tmp, sizeof(tmp), " %s%d: <solaris:", state->name, origin);
+                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+        }
+        if (le32_to_cpu(v->v_version) != 1) {
+                char tmp[64];
+
+                snprintf(tmp, sizeof(tmp), "  cannot handle version %d vtoc>\n",
+                         le32_to_cpu(v->v_version));
+                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                put_dev_sector(sect);
+                return;
+        }
+        /* Ensure we can handle previous case of VTOC with 8 entries gracefully */
+        max_nparts = le16_to_cpu (v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8;
+        for (i=0; i<max_nparts && state->next<state->limit; i++) {
+                struct solaris_x86_slice *s = &v->v_slice[i];
+                char tmp[3 + 10 + 1 + 1];
+
+                if (s->s_size == 0)
+                        continue;
+                snprintf(tmp, sizeof(tmp), " [s%d]", i);
+                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                /* solaris partitions are relative to current MS-DOS
+                 * one; must add the offset of the current partition */
+                put_partition(state, state->next++,
+                                 le32_to_cpu(s->s_start)+offset,
+                                 le32_to_cpu(s->s_size));
+        }
+        put_dev_sector(sect);
+        strlcat(state->pp_buf, " >\n", PAGE_SIZE);
+#endif
+}
+
+#if defined(CONFIG_BSD_DISKLABEL)
+/* 
+ * Create devices for BSD partitions listed in a disklabel, under a
+ * dos-like partition. See parse_extended() for more information.
+ */
+static void parse_bsd(struct parsed_partitions *state,
+                      sector_t offset, sector_t size, int origin, char *flavour,
+                      int max_partitions)
+{
+        Sector sect;
+        struct bsd_disklabel *l;
+        struct bsd_partition *p;
+        char tmp[64];
+
+        l = read_part_sector(state, offset + 1, &sect);
+        if (!l)
+                return;
+        if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) {
+                put_dev_sector(sect);
+                return;
+        }
+
+        snprintf(tmp, sizeof(tmp), " %s%d: <%s:", state->name, origin, flavour);
+        strlcat(state->pp_buf, tmp, PAGE_SIZE);
+
+        if (le16_to_cpu(l->d_npartitions) < max_partitions)
+                max_partitions = le16_to_cpu(l->d_npartitions);
+        for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
+                sector_t bsd_start, bsd_size;
+
+                if (state->next == state->limit)
+                        break;
+                if (p->p_fstype == BSD_FS_UNUSED) 
+                        continue;
+                bsd_start = le32_to_cpu(p->p_offset);
+                bsd_size = le32_to_cpu(p->p_size);
+                if (offset == bsd_start && size == bsd_size)
+                        /* full parent partition, we have it already */
+                        continue;
+                if (offset > bsd_start || offset+size < bsd_start+bsd_size) {
+                        strlcat(state->pp_buf, "bad subpartition - ignored\n", PAGE_SIZE);
+                        continue;
+                }
+                put_partition(state, state->next++, bsd_start, bsd_size);
+        }
+        put_dev_sector(sect);
+        if (le16_to_cpu(l->d_npartitions) > max_partitions) {
+                snprintf(tmp, sizeof(tmp), " (ignored %d more)",
+                         le16_to_cpu(l->d_npartitions) - max_partitions);
+                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+        }
+        strlcat(state->pp_buf, " >\n", PAGE_SIZE);
+}
+#endif
+
+static void parse_freebsd(struct parsed_partitions *state,
+                          sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_BSD_DISKLABEL
+        parse_bsd(state, offset, size, origin, "bsd", BSD_MAXPARTITIONS);
+#endif
+}
+
+static void parse_netbsd(struct parsed_partitions *state,
+                         sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_BSD_DISKLABEL
+        parse_bsd(state, offset, size, origin, "netbsd", BSD_MAXPARTITIONS);
+#endif
+}
+
+static void parse_openbsd(struct parsed_partitions *state,
+                          sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_BSD_DISKLABEL
+        parse_bsd(state, offset, size, origin, "openbsd",
+                  OPENBSD_MAXPARTITIONS);
+#endif
+}
+
+/*
+ * Create devices for Unixware partitions listed in a disklabel, under a
+ * dos-like partition. See parse_extended() for more information.
+ */
+static void parse_unixware(struct parsed_partitions *state,
+                           sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_UNIXWARE_DISKLABEL
+        Sector sect;
+        struct unixware_disklabel *l;
+        struct unixware_slice *p;
+
+        l = read_part_sector(state, offset + 29, &sect);
+        if (!l)
+                return;
+        if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC ||
+            le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) {
+                put_dev_sector(sect);
+                return;
+        }
+        {
+                char tmp[1 + BDEVNAME_SIZE + 10 + 12 + 1];
+
+                snprintf(tmp, sizeof(tmp), " %s%d: <unixware:", state->name, origin);
+                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+        }
+        p = &l->vtoc.v_slice[1];
+        /* I omit the 0th slice as it is the same as whole disk. */
+        while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) {
+                if (state->next == state->limit)
+                        break;
+
+                if (p->s_label != UNIXWARE_FS_UNUSED)
+                        put_partition(state, state->next++,
+                                      le32_to_cpu(p->start_sect),
+                                      le32_to_cpu(p->nr_sects));
+                p++;
+        }
+        put_dev_sector(sect);
+        strlcat(state->pp_buf, " >\n", PAGE_SIZE);
+#endif
+}
+
+/*
+ * Minix 2.0.0/2.0.2 subpartition support.
+ * Anand Krishnamurthy <anandk@wiproge.med.ge.com>
+ * Rajeev V. Pillai    <rajeevvp@yahoo.com>
+ */
+static void parse_minix(struct parsed_partitions *state,
+                        sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_MINIX_SUBPARTITION
+        Sector sect;
+        unsigned char *data;
+        struct partition *p;
+        int i;
+
+        data = read_part_sector(state, offset, &sect);
+        if (!data)
+                return;
+
+        p = (struct partition *)(data + 0x1be);
+
+        /* The first sector of a Minix partition can have either
+         * a secondary MBR describing its subpartitions, or
+         * the normal boot sector. */
+        if (msdos_magic_present (data + 510) &&
+            SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
+                char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1];
+
+                snprintf(tmp, sizeof(tmp), " %s%d: <minix:", state->name, origin);
+                strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) {
+                        if (state->next == state->limit)
+                                break;
+                        /* add each partition in use */
+                        if (SYS_IND(p) == MINIX_PARTITION)
+                                put_partition(state, state->next++,
+                                              start_sect(p), nr_sects(p));
+                }
+                strlcat(state->pp_buf, " >\n", PAGE_SIZE);
+        }
+        put_dev_sector(sect);
+#endif /* CONFIG_MINIX_SUBPARTITION */
+}
+
+static struct {
+        unsigned char id;
+        void (*parse)(struct parsed_partitions *, sector_t, sector_t, int);
+} subtypes[] = {
+        {FREEBSD_PARTITION, parse_freebsd},
+        {NETBSD_PARTITION, parse_netbsd},
+        {OPENBSD_PARTITION, parse_openbsd},
+        {MINIX_PARTITION, parse_minix},
+        {UNIXWARE_PARTITION, parse_unixware},
+        {SOLARIS_X86_PARTITION, parse_solaris_x86},
+        {NEW_SOLARIS_X86_PARTITION, parse_solaris_x86},
+        {0, NULL},
+};
+ 
+int msdos_partition(struct parsed_partitions *state)
+{
+        sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
+        Sector sect;
+        unsigned char *data;
+        struct partition *p;
+        struct fat_boot_sector *fb;
+        int slot;
+
+        data = read_part_sector(state, 0, &sect);
+        if (!data)
+                return -1;
+        if (!msdos_magic_present(data + 510)) {
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        if (aix_magic_present(state, data)) {
+                put_dev_sector(sect);
+                strlcat(state->pp_buf, " [AIX]", PAGE_SIZE);
+                return 0;
+        }
+
+        /*
+         * Now that the 55aa signature is present, this is probably
+         * either the boot sector of a FAT filesystem or a DOS-type
+         * partition table. Reject this in case the boot indicator
+         * is not 0 or 0x80.
+         */
+        p = (struct partition *) (data + 0x1be);
+        for (slot = 1; slot <= 4; slot++, p++) {
+                if (p->boot_ind != 0 && p->boot_ind != 0x80) {
+                        /*
+                         * Even without a valid boot inidicator value
+                         * its still possible this is valid FAT filesystem
+                         * without a partition table.
+                         */
+                        fb = (struct fat_boot_sector *) data;
+                        if (slot == 1 && fb->reserved && fb->fats
+                                && fat_valid_media(fb->media)) {
+                                strlcat(state->pp_buf, "\n", PAGE_SIZE);
+                                put_dev_sector(sect);
+                                return 1;
+                        } else {
+                                put_dev_sector(sect);
+                                return 0;
+                        }
+                }
+        }
+
+#ifdef CONFIG_EFI_PARTITION
+        p = (struct partition *) (data + 0x1be);
+        for (slot = 1 ; slot <= 4 ; slot++, p++) {
+                /* If this is an EFI GPT disk, msdos should ignore it. */
+                if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
+                        put_dev_sector(sect);
+                        return 0;
+                }
+        }
+#endif
+        p = (struct partition *) (data + 0x1be);
+
+        /*
+         * Look for partitions in two passes:
+         * First find the primary and DOS-type extended partitions.
+         * On the second pass look inside *BSD, Unixware and Solaris partitions.
+         */
+
+        state->next = 5;
+        for (slot = 1 ; slot <= 4 ; slot++, p++) {
+                sector_t start = start_sect(p)*sector_size;
+                sector_t size = nr_sects(p)*sector_size;
+                if (!size)
+                        continue;
+                if (is_extended_partition(p)) {
+                        /*
+                         * prevent someone doing mkfs or mkswap on an
+                         * extended partition, but leave room for LILO
+                         * FIXME: this uses one logical sector for > 512b
+                         * sector, although it may not be enough/proper.
+                         */
+                        sector_t n = 2;
+                        n = min(size, max(sector_size, n));
+                        put_partition(state, slot, start, n);
+
+                        strlcat(state->pp_buf, " <", PAGE_SIZE);
+                        parse_extended(state, start, size);
+                        strlcat(state->pp_buf, " >", PAGE_SIZE);
+                        continue;
+                }
+                put_partition(state, slot, start, size);
+                if (SYS_IND(p) == LINUX_RAID_PARTITION)
+                        state->parts[slot].flags = ADDPART_FLAG_RAID;
+                if (SYS_IND(p) == DM6_PARTITION)
+                        strlcat(state->pp_buf, "[DM]", PAGE_SIZE);
+                if (SYS_IND(p) == EZD_PARTITION)
+                        strlcat(state->pp_buf, "[EZD]", PAGE_SIZE);
+        }
+
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+
+        /* second pass - output for each on a separate line */
+        p = (struct partition *) (0x1be + data);
+        for (slot = 1 ; slot <= 4 ; slot++, p++) {
+                unsigned char id = SYS_IND(p);
+                int n;
+
+                if (!nr_sects(p))
+                        continue;
+
+                for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
+                        ;
+
+                if (!subtypes[n].parse)
+                        continue;
+                subtypes[n].parse(state, start_sect(p) * sector_size,
+                                  nr_sects(p) * sector_size, slot);
+        }
+        put_dev_sector(sect);
+        return 1;
+}
diff --git a/fs/partitions/msdos.h b/fs/partitions/msdos.h
new file mode 100644
index 00000000000..38c781c490b
--- /dev/null
+++ b/fs/partitions/msdos.h
@@ -0,0 +1,8 @@
+/*
+ *  fs/partitions/msdos.h
+ */
+
+#define MSDOS_LABEL_MAGIC               0xAA55
+
+int msdos_partition(struct parsed_partitions *state);
+
diff --git a/fs/partitions/osf.c b/fs/partitions/osf.c
new file mode 100644
index 00000000000..764b86a0196
--- /dev/null
+++ b/fs/partitions/osf.c
@@ -0,0 +1,86 @@
+/*
+ *  fs/partitions/osf.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include "check.h"
+#include "osf.h"
+
+#define MAX_OSF_PARTITIONS 18
+
+int osf_partition(struct parsed_partitions *state)
+{
+        int i;
+        int slot = 1;
+        unsigned int npartitions;
+        Sector sect;
+        unsigned char *data;
+        struct disklabel {
+                __le32 d_magic;
+                __le16 d_type,d_subtype;
+                u8 d_typename[16];
+                u8 d_packname[16];
+                __le32 d_secsize;
+                __le32 d_nsectors;
+                __le32 d_ntracks;
+                __le32 d_ncylinders;
+                __le32 d_secpercyl;
+                __le32 d_secprtunit;
+                __le16 d_sparespertrack;
+                __le16 d_sparespercyl;
+                __le32 d_acylinders;
+                __le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
+                __le32 d_headswitch, d_trkseek, d_flags;
+                __le32 d_drivedata[5];
+                __le32 d_spare[5];
+                __le32 d_magic2;
+                __le16 d_checksum;
+                __le16 d_npartitions;
+                __le32 d_bbsize, d_sbsize;
+                struct d_partition {
+                        __le32 p_size;
+                        __le32 p_offset;
+                        __le32 p_fsize;
+                        u8  p_fstype;
+                        u8  p_frag;
+                        __le16 p_cpg;
+                } d_partitions[MAX_OSF_PARTITIONS];
+        } * label;
+        struct d_partition * partition;
+
+        data = read_part_sector(state, 0, &sect);
+        if (!data)
+                return -1;
+
+        label = (struct disklabel *) (data+64);
+        partition = label->d_partitions;
+        if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
+                put_dev_sector(sect);
+                return 0;
+        }
+        if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
+                put_dev_sector(sect);
+                return 0;
+        }
+        npartitions = le16_to_cpu(label->d_npartitions);
+        if (npartitions > MAX_OSF_PARTITIONS) {
+                put_dev_sector(sect);
+                return 0;
+        }
+        for (i = 0 ; i < npartitions; i++, partition++) {
+                if (slot == state->limit)
+                        break;
+                if (le32_to_cpu(partition->p_size))
+                        put_partition(state, slot,
+                                le32_to_cpu(partition->p_offset),
+                                le32_to_cpu(partition->p_size));
+                slot++;
+        }
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        put_dev_sector(sect);
+        return 1;
+}
diff --git a/fs/partitions/osf.h b/fs/partitions/osf.h
new file mode 100644
index 00000000000..20ed2315ec1
--- /dev/null
+++ b/fs/partitions/osf.h
@@ -0,0 +1,7 @@
+/*
+ *  fs/partitions/osf.h
+ */
+
+#define DISKLABELMAGIC (0x82564557UL)
+
+int osf_partition(struct parsed_partitions *state);
diff --git a/fs/partitions/sgi.c b/fs/partitions/sgi.c
new file mode 100644
index 00000000000..ea8a86dceaf
--- /dev/null
+++ b/fs/partitions/sgi.c
@@ -0,0 +1,82 @@
+/*
+ *  fs/partitions/sgi.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ */
+
+#include "check.h"
+#include "sgi.h"
+
+struct sgi_disklabel {
+        __be32 magic_mushroom;          /* Big fat spliff... */
+        __be16 root_part_num;           /* Root partition number */
+        __be16 swap_part_num;           /* Swap partition number */
+        s8 boot_file[16];               /* Name of boot file for ARCS */
+        u8 _unused0[48];                /* Device parameter useless crapola.. */
+        struct sgi_volume {
+                s8 name[8];             /* Name of volume */
+                __be32 block_num;               /* Logical block number */
+                __be32 num_bytes;               /* How big, in bytes */
+        } volume[15];
+        struct sgi_partition {
+                __be32 num_blocks;              /* Size in logical blocks */
+                __be32 first_block;     /* First logical block */
+                __be32 type;            /* Type of this partition */
+        } partitions[16];
+        __be32 csum;                    /* Disk label checksum */
+        __be32 _unused1;                        /* Padding */
+};
+
+int sgi_partition(struct parsed_partitions *state)
+{
+        int i, csum;
+        __be32 magic;
+        int slot = 1;
+        unsigned int start, blocks;
+        __be32 *ui, cs;
+        Sector sect;
+        struct sgi_disklabel *label;
+        struct sgi_partition *p;
+        char b[BDEVNAME_SIZE];
+
+        label = read_part_sector(state, 0, &sect);
+        if (!label)
+                return -1;
+        p = &label->partitions[0];
+        magic = label->magic_mushroom;
+        if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
+                /*printk("Dev %s SGI disklabel: bad magic %08x\n",
+                       bdevname(bdev, b), be32_to_cpu(magic));*/
+                put_dev_sector(sect);
+                return 0;
+        }
+        ui = ((__be32 *) (label + 1)) - 1;
+        for(csum = 0; ui >= ((__be32 *) label);) {
+                cs = *ui--;
+                csum += be32_to_cpu(cs);
+        }
+        if(csum) {
+                printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
+                       bdevname(state->bdev, b));
+                put_dev_sector(sect);
+                return 0;
+        }
+        /* All SGI disk labels have 16 partitions, disks under Linux only
+         * have 15 minor's.  Luckily there are always a few zero length
+         * partitions which we don't care about so we never overflow the
+         * current_minor.
+         */
+        for(i = 0; i < 16; i++, p++) {
+                blocks = be32_to_cpu(p->num_blocks);
+                start  = be32_to_cpu(p->first_block);
+                if (blocks) {
+                        put_partition(state, slot, start, blocks);
+                        if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION)
+                                state->parts[slot].flags = ADDPART_FLAG_RAID;
+                }
+                slot++;
+        }
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        put_dev_sector(sect);
+        return 1;
+}
diff --git a/fs/partitions/sgi.h b/fs/partitions/sgi.h
new file mode 100644
index 00000000000..b9553ebdd5a
--- /dev/null
+++ b/fs/partitions/sgi.h
@@ -0,0 +1,8 @@
+/*
+ *  fs/partitions/sgi.h
+ */
+
+extern int sgi_partition(struct parsed_partitions *state);
+
+#define SGI_LABEL_MAGIC 0x0be5a941
+
diff --git a/fs/partitions/sun.c b/fs/partitions/sun.c
new file mode 100644
index 00000000000..b5b6fcfb3d3
--- /dev/null
+++ b/fs/partitions/sun.c
@@ -0,0 +1,122 @@
+/*
+ *  fs/partitions/sun.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include "check.h"
+#include "sun.h"
+
+int sun_partition(struct parsed_partitions *state)
+{
+        int i;
+        __be16 csum;
+        int slot = 1;
+        __be16 *ush;
+        Sector sect;
+        struct sun_disklabel {
+                unsigned char info[128];   /* Informative text string */
+                struct sun_vtoc {
+                    __be32 version;     /* Layout version */
+                    char   volume[8];   /* Volume name */
+                    __be16 nparts;      /* Number of partitions */
+                    struct sun_info {           /* Partition hdrs, sec 2 */
+                        __be16 id;
+                        __be16 flags;
+                    } infos[8];
+                    __be16 padding;     /* Alignment padding */
+                    __be32 bootinfo[3];  /* Info needed by mboot */
+                    __be32 sanity;       /* To verify vtoc sanity */
+                    __be32 reserved[10]; /* Free space */
+                    __be32 timestamp[8]; /* Partition timestamp */
+                } vtoc;
+                __be32 write_reinstruct; /* sectors to skip, writes */
+                __be32 read_reinstruct;  /* sectors to skip, reads */
+                unsigned char spare[148]; /* Padding */
+                __be16 rspeed;     /* Disk rotational speed */
+                __be16 pcylcount;  /* Physical cylinder count */
+                __be16 sparecyl;   /* extra sects per cylinder */
+                __be16 obs1;       /* gap1 */
+                __be16 obs2;       /* gap2 */
+                __be16 ilfact;     /* Interleave factor */
+                __be16 ncyl;       /* Data cylinder count */
+                __be16 nacyl;      /* Alt. cylinder count */
+                __be16 ntrks;      /* Tracks per cylinder */
+                __be16 nsect;      /* Sectors per track */
+                __be16 obs3;       /* bhead - Label head offset */
+                __be16 obs4;       /* ppart - Physical Partition */
+                struct sun_partition {
+                        __be32 start_cylinder;
+                        __be32 num_sectors;
+                } partitions[8];
+                __be16 magic;      /* Magic number */
+                __be16 csum;       /* Label xor'd checksum */
+        } * label;
+        struct sun_partition *p;
+        unsigned long spc;
+        char b[BDEVNAME_SIZE];
+        int use_vtoc;
+        int nparts;
+
+        label = read_part_sector(state, 0, &sect);
+        if (!label)
+                return -1;
+
+        p = label->partitions;
+        if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
+/*              printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
+                       bdevname(bdev, b), be16_to_cpu(label->magic)); */
+                put_dev_sector(sect);
+                return 0;
+        }
+        /* Look at the checksum */
+        ush = ((__be16 *) (label+1)) - 1;
+        for (csum = 0; ush >= ((__be16 *) label);)
+                csum ^= *ush--;
+        if (csum) {
+                printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
+                       bdevname(state->bdev, b));
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        /* Check to see if we can use the VTOC table */
+        use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&
+                    (be32_to_cpu(label->vtoc.version) == 1) &&
+                    (be16_to_cpu(label->vtoc.nparts) <= 8));
+
+        /* Use 8 partition entries if not specified in validated VTOC */
+        nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;
+
+        /*
+         * So that old Linux-Sun partitions continue to work,
+         * alow the VTOC to be used under the additional condition ...
+         */
+        use_vtoc = use_vtoc || !(label->vtoc.sanity ||
+                                 label->vtoc.version || label->vtoc.nparts);
+        spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
+        for (i = 0; i < nparts; i++, p++) {
+                unsigned long st_sector;
+                unsigned int num_sectors;
+
+                st_sector = be32_to_cpu(p->start_cylinder) * spc;
+                num_sectors = be32_to_cpu(p->num_sectors);
+                if (num_sectors) {
+                        put_partition(state, slot, st_sector, num_sectors);
+                        state->parts[slot].flags = 0;
+                        if (use_vtoc) {
+                                if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)
+                                        state->parts[slot].flags |= ADDPART_FLAG_RAID;
+                                else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)
+                                        state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
+                        }
+                }
+                slot++;
+        }
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        put_dev_sector(sect);
+        return 1;
+}
diff --git a/fs/partitions/sun.h b/fs/partitions/sun.h
new file mode 100644
index 00000000000..2424baa8319
--- /dev/null
+++ b/fs/partitions/sun.h
@@ -0,0 +1,8 @@
+/*
+ *  fs/partitions/sun.h
+ */
+
+#define SUN_LABEL_MAGIC          0xDABE
+#define SUN_VTOC_SANITY          0x600DDEEE
+
+int sun_partition(struct parsed_partitions *state);
diff --git a/fs/partitions/sysv68.c b/fs/partitions/sysv68.c
new file mode 100644
index 00000000000..9627ccffc1c
--- /dev/null
+++ b/fs/partitions/sysv68.c
@@ -0,0 +1,95 @@
+/*
+ *  fs/partitions/sysv68.c
+ *
+ *  Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be>
+ */
+
+#include "check.h"
+#include "sysv68.h"
+
+/*
+ *      Volume ID structure: on first 256-bytes sector of disk
+ */
+
+struct volumeid {
+        u8      vid_unused[248];
+        u8      vid_mac[8];     /* ASCII string "MOTOROLA" */
+};
+
+/*
+ *      config block: second 256-bytes sector on disk
+ */
+
+struct dkconfig {
+        u8      ios_unused0[128];
+        __be32  ios_slcblk;     /* Slice table block number */
+        __be16  ios_slccnt;     /* Number of entries in slice table */
+        u8      ios_unused1[122];
+};
+
+/*
+ *      combined volumeid and dkconfig block
+ */
+
+struct dkblk0 {
+        struct volumeid dk_vid;
+        struct dkconfig dk_ios;
+};
+
+/*
+ *      Slice Table Structure
+ */
+
+struct slice {
+        __be32  nblocks;                /* slice size (in blocks) */
+        __be32  blkoff;                 /* block offset of slice */
+};
+
+
+int sysv68_partition(struct parsed_partitions *state)
+{
+        int i, slices;
+        int slot = 1;
+        Sector sect;
+        unsigned char *data;
+        struct dkblk0 *b;
+        struct slice *slice;
+        char tmp[64];
+
+        data = read_part_sector(state, 0, &sect);
+        if (!data)
+                return -1;
+
+        b = (struct dkblk0 *)data;
+        if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
+                put_dev_sector(sect);
+                return 0;
+        }
+        slices = be16_to_cpu(b->dk_ios.ios_slccnt);
+        i = be32_to_cpu(b->dk_ios.ios_slcblk);
+        put_dev_sector(sect);
+
+        data = read_part_sector(state, i, &sect);
+        if (!data)
+                return -1;
+
+        slices -= 1; /* last slice is the whole disk */
+        snprintf(tmp, sizeof(tmp), "sysV68: %s(s%u)", state->name, slices);
+        strlcat(state->pp_buf, tmp, PAGE_SIZE);
+        slice = (struct slice *)data;
+        for (i = 0; i < slices; i++, slice++) {
+                if (slot == state->limit)
+                        break;
+                if (be32_to_cpu(slice->nblocks)) {
+                        put_partition(state, slot,
+                                be32_to_cpu(slice->blkoff),
+                                be32_to_cpu(slice->nblocks));
+                        snprintf(tmp, sizeof(tmp), "(s%u)", i);
+                        strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                }
+                slot++;
+        }
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        put_dev_sector(sect);
+        return 1;
+}
diff --git a/fs/partitions/sysv68.h b/fs/partitions/sysv68.h
new file mode 100644
index 00000000000..bf2f5ffa97a
--- /dev/null
+++ b/fs/partitions/sysv68.h
@@ -0,0 +1 @@
+extern int sysv68_partition(struct parsed_partitions *state);
diff --git a/fs/partitions/ultrix.c b/fs/partitions/ultrix.c
new file mode 100644
index 00000000000..8dbaf9f77a9
--- /dev/null
+++ b/fs/partitions/ultrix.c
@@ -0,0 +1,48 @@
+/*
+ *  fs/partitions/ultrix.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Re-organised Jul 1999 Russell King
+ */
+
+#include "check.h"
+#include "ultrix.h"
+
+int ultrix_partition(struct parsed_partitions *state)
+{
+        int i;
+        Sector sect;
+        unsigned char *data;
+        struct ultrix_disklabel {
+                s32     pt_magic;       /* magic no. indicating part. info exits */
+                s32     pt_valid;       /* set by driver if pt is current */
+                struct  pt_info {
+                        s32             pi_nblocks; /* no. of sectors */
+                        u32             pi_blkoff;  /* block offset for start */
+                } pt_part[8];
+        } *label;
+
+#define PT_MAGIC        0x032957        /* Partition magic number */
+#define PT_VALID        1               /* Indicates if struct is valid */
+
+        data = read_part_sector(state, (16384 - sizeof(*label))/512, &sect);
+        if (!data)
+                return -1;
+        
+        label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label));
+
+        if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) {
+                for (i=0; i<8; i++)
+                        if (label->pt_part[i].pi_nblocks)
+                                put_partition(state, i+1, 
+                                              label->pt_part[i].pi_blkoff,
+                                              label->pt_part[i].pi_nblocks);
+                put_dev_sector(sect);
+                strlcat(state->pp_buf, "\n", PAGE_SIZE);
+                return 1;
+        } else {
+                put_dev_sector(sect);
+                return 0;
+        }
+}
diff --git a/fs/partitions/ultrix.h b/fs/partitions/ultrix.h
new file mode 100644
index 00000000000..a3cc00b2bde
--- /dev/null
+++ b/fs/partitions/ultrix.h
@@ -0,0 +1,5 @@
+/*
+ *  fs/partitions/ultrix.h
+ */
+
+int ultrix_partition(struct parsed_partitions *state);
diff --git a/fs/xfs/xfs_fs_subr.c b/fs/xfs/xfs_fs_subr.c
new file mode 100644
index 00000000000..ed88ed16811
--- /dev/null
+++ b/fs/xfs/xfs_fs_subr.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2000-2002,2005-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include "xfs.h"
+#include "xfs_vnodeops.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_inode.h"
+#include "xfs_trace.h"
+
+/*
+ * note: all filemap functions return negative error codes. These
+ * need to be inverted before returning to the xfs core functions.
+ */
+void
+xfs_tosspages(
+        xfs_inode_t     *ip,
+        xfs_off_t       first,
+        xfs_off_t       last,
+        int             fiopt)
+{
+        /* can't toss partial tail pages, so mask them out */
+        last &= ~(PAGE_SIZE - 1);
+        truncate_inode_pages_range(VFS_I(ip)->i_mapping, first, last - 1);
+}
+
+int
+xfs_flushinval_pages(
+        xfs_inode_t     *ip,
+        xfs_off_t       first,
+        xfs_off_t       last,
+        int             fiopt)
+{
+        struct address_space *mapping = VFS_I(ip)->i_mapping;
+        int             ret = 0;
+
+        trace_xfs_pagecache_inval(ip, first, last);
+
+        xfs_iflags_clear(ip, XFS_ITRUNCATED);
+        ret = filemap_write_and_wait_range(mapping, first,
+                                last == -1 ? LLONG_MAX : last);
+        if (!ret)
+                truncate_inode_pages_range(mapping, first, last);
+        return -ret;
+}
+
+int
+xfs_flush_pages(
+        xfs_inode_t     *ip,
+        xfs_off_t       first,
+        xfs_off_t       last,
+        uint64_t        flags,
+        int             fiopt)
+{
+        struct address_space *mapping = VFS_I(ip)->i_mapping;
+        int             ret = 0;
+        int             ret2;
+
+        xfs_iflags_clear(ip, XFS_ITRUNCATED);
+        ret = -filemap_fdatawrite_range(mapping, first,
+                                last == -1 ? LLONG_MAX : last);
+        if (flags & XBF_ASYNC)
+                return ret;
+        ret2 = xfs_wait_on_pages(ip, first, last);
+        if (!ret)
+                ret = ret2;
+        return ret;
+}
+
+int
+xfs_wait_on_pages(
+        xfs_inode_t     *ip,
+        xfs_off_t       first,
+        xfs_off_t       last)
+{
+        struct address_space *mapping = VFS_I(ip)->i_mapping;
+
+        if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK)) {
+                return -filemap_fdatawait_range(mapping, first,
+                                        last == -1 ? ip->i_size - 1 : last);
+        }
+        return 0;
+}
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
new file mode 100644
index 00000000000..7759812c1bb
--- /dev/null
+++ b/fs/xfs/xfs_iget.c
@@ -0,0 +1,720 @@
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_types.h"
+#include "xfs_acl.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_quota.h"
+#include "xfs_utils.h"
+#include "xfs_trans_priv.h"
+#include "xfs_inode_item.h"
+#include "xfs_bmap.h"
+#include "xfs_trace.h"
+
+
+/*
+ * Define xfs inode iolock lockdep classes. We need to ensure that all active
+ * inodes are considered the same for lockdep purposes, including inodes that
+ * are recycled through the XFS_IRECLAIMABLE state. This is the the only way to
+ * guarantee the locks are considered the same when there are multiple lock
+ * initialisation siteѕ. Also, define a reclaimable inode class so it is
+ * obvious in lockdep reports which class the report is against.
+ */
+static struct lock_class_key xfs_iolock_active;
+struct lock_class_key xfs_iolock_reclaimable;
+
+/*
+ * Allocate and initialise an xfs_inode.
+ */
+STATIC struct xfs_inode *
+xfs_inode_alloc(
+        struct xfs_mount        *mp,
+        xfs_ino_t               ino)
+{
+        struct xfs_inode        *ip;
+
+        /*
+         * if this didn't occur in transactions, we could use
+         * KM_MAYFAIL and return NULL here on ENOMEM. Set the
+         * code up to do this anyway.
+         */
+        ip = kmem_zone_alloc(xfs_inode_zone, KM_SLEEP);
+        if (!ip)
+                return NULL;
+        if (inode_init_always(mp->m_super, VFS_I(ip))) {
+                kmem_zone_free(xfs_inode_zone, ip);
+                return NULL;
+        }
+
+        ASSERT(atomic_read(&ip->i_iocount) == 0);
+        ASSERT(atomic_read(&ip->i_pincount) == 0);
+        ASSERT(!spin_is_locked(&ip->i_flags_lock));
+        ASSERT(completion_done(&ip->i_flush));
+        ASSERT(ip->i_ino == 0);
+
+        mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
+        lockdep_set_class_and_name(&ip->i_iolock.mr_lock,
+                        &xfs_iolock_active, "xfs_iolock_active");
+
+        /* initialise the xfs inode */
+        ip->i_ino = ino;
+        ip->i_mount = mp;
+        memset(&ip->i_imap, 0, sizeof(struct xfs_imap));
+        ip->i_afp = NULL;
+        memset(&ip->i_df, 0, sizeof(xfs_ifork_t));
+        ip->i_flags = 0;
+        ip->i_update_core = 0;
+        ip->i_delayed_blks = 0;
+        memset(&ip->i_d, 0, sizeof(xfs_icdinode_t));
+        ip->i_size = 0;
+        ip->i_new_size = 0;
+
+        return ip;
+}
+
+STATIC void
+xfs_inode_free_callback(
+        struct rcu_head         *head)
+{
+        struct inode            *inode = container_of(head, struct inode, i_rcu);
+        struct xfs_inode        *ip = XFS_I(inode);
+
+        INIT_LIST_HEAD(&inode->i_dentry);
+        kmem_zone_free(xfs_inode_zone, ip);
+}
+
+void
+xfs_inode_free(
+        struct xfs_inode        *ip)
+{
+        switch (ip->i_d.di_mode & S_IFMT) {
+        case S_IFREG:
+        case S_IFDIR:
+        case S_IFLNK:
+                xfs_idestroy_fork(ip, XFS_DATA_FORK);
+                break;
+        }
+
+        if (ip->i_afp)
+                xfs_idestroy_fork(ip, XFS_ATTR_FORK);
+
+        if (ip->i_itemp) {
+                /*
+                 * Only if we are shutting down the fs will we see an
+                 * inode still in the AIL. If it is there, we should remove
+                 * it to prevent a use-after-free from occurring.
+                 */
+                xfs_log_item_t  *lip = &ip->i_itemp->ili_item;
+                struct xfs_ail  *ailp = lip->li_ailp;
+
+                ASSERT(((lip->li_flags & XFS_LI_IN_AIL) == 0) ||
+                                       XFS_FORCED_SHUTDOWN(ip->i_mount));
+                if (lip->li_flags & XFS_LI_IN_AIL) {
+                        spin_lock(&ailp->xa_lock);
+                        if (lip->li_flags & XFS_LI_IN_AIL)
+                                xfs_trans_ail_delete(ailp, lip);
+                        else
+                                spin_unlock(&ailp->xa_lock);
+                }
+                xfs_inode_item_destroy(ip);
+                ip->i_itemp = NULL;
+        }
+
+        /* asserts to verify all state is correct here */
+        ASSERT(atomic_read(&ip->i_iocount) == 0);
+        ASSERT(atomic_read(&ip->i_pincount) == 0);
+        ASSERT(!spin_is_locked(&ip->i_flags_lock));
+        ASSERT(completion_done(&ip->i_flush));
+
+        /*
+         * Because we use RCU freeing we need to ensure the inode always
+         * appears to be reclaimed with an invalid inode number when in the
+         * free state. The ip->i_flags_lock provides the barrier against lookup
+         * races.
+         */
+        spin_lock(&ip->i_flags_lock);
+        ip->i_flags = XFS_IRECLAIM;
+        ip->i_ino = 0;
+        spin_unlock(&ip->i_flags_lock);
+
+        call_rcu(&VFS_I(ip)->i_rcu, xfs_inode_free_callback);
+}
+
+/*
+ * Check the validity of the inode we just found it the cache
+ */
+static int
+xfs_iget_cache_hit(
+        struct xfs_perag        *pag,
+        struct xfs_inode        *ip,
+        xfs_ino_t               ino,
+        int                     flags,
+        int                     lock_flags) __releases(RCU)
+{
+        struct inode            *inode = VFS_I(ip);
+        struct xfs_mount        *mp = ip->i_mount;
+        int                     error;
+
+        /*
+         * check for re-use of an inode within an RCU grace period due to the
+         * radix tree nodes not being updated yet. We monitor for this by
+         * setting the inode number to zero before freeing the inode structure.
+         * If the inode has been reallocated and set up, then the inode number
+         * will not match, so check for that, too.
+         */
+        spin_lock(&ip->i_flags_lock);
+        if (ip->i_ino != ino) {
+                trace_xfs_iget_skip(ip);
+                XFS_STATS_INC(xs_ig_frecycle);
+                error = EAGAIN;
+                goto out_error;
+        }
+
+
+        /*
+         * If we are racing with another cache hit that is currently
+         * instantiating this inode or currently recycling it out of
+         * reclaimabe state, wait for the initialisation to complete
+         * before continuing.
+         *
+         * XXX(hch): eventually we should do something equivalent to
+         *           wait_on_inode to wait for these flags to be cleared
+         *           instead of polling for it.
+         */
+        if (ip->i_flags & (XFS_INEW|XFS_IRECLAIM)) {
+                trace_xfs_iget_skip(ip);
+                XFS_STATS_INC(xs_ig_frecycle);
+                error = EAGAIN;
+                goto out_error;
+        }
+
+        /*
+         * If lookup is racing with unlink return an error immediately.
+         */
+        if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) {
+                error = ENOENT;
+                goto out_error;
+        }
+
+        /*
+         * If IRECLAIMABLE is set, we've torn down the VFS inode already.
+         * Need to carefully get it back into useable state.
+         */
+        if (ip->i_flags & XFS_IRECLAIMABLE) {
+                trace_xfs_iget_reclaim(ip);
+
+                /*
+                 * We need to set XFS_IRECLAIM to prevent xfs_reclaim_inode
+                 * from stomping over us while we recycle the inode.  We can't
+                 * clear the radix tree reclaimable tag yet as it requires
+                 * pag_ici_lock to be held exclusive.
+                 */
+                ip->i_flags |= XFS_IRECLAIM;
+
+                spin_unlock(&ip->i_flags_lock);
+                rcu_read_unlock();
+
+                error = -inode_init_always(mp->m_super, inode);
+                if (error) {
+                        /*
+                         * Re-initializing the inode failed, and we are in deep
+                         * trouble.  Try to re-add it to the reclaim list.
+                         */
+                        rcu_read_lock();
+                        spin_lock(&ip->i_flags_lock);
+
+                        ip->i_flags &= ~(XFS_INEW | XFS_IRECLAIM);
+                        ASSERT(ip->i_flags & XFS_IRECLAIMABLE);
+                        trace_xfs_iget_reclaim_fail(ip);
+                        goto out_error;
+                }
+
+                spin_lock(&pag->pag_ici_lock);
+                spin_lock(&ip->i_flags_lock);
+
+                /*
+                 * Clear the per-lifetime state in the inode as we are now
+                 * effectively a new inode and need to return to the initial
+                 * state before reuse occurs.
+                 */
+                ip->i_flags &= ~XFS_IRECLAIM_RESET_FLAGS;
+                ip->i_flags |= XFS_INEW;
+                __xfs_inode_clear_reclaim_tag(mp, pag, ip);
+                inode->i_state = I_NEW;
+
+                ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
+                mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
+                lockdep_set_class_and_name(&ip->i_iolock.mr_lock,
+                                &xfs_iolock_active, "xfs_iolock_active");
+
+                spin_unlock(&ip->i_flags_lock);
+                spin_unlock(&pag->pag_ici_lock);
+        } else {
+                /* If the VFS inode is being torn down, pause and try again. */
+                if (!igrab(inode)) {
+                        trace_xfs_iget_skip(ip);
+                        error = EAGAIN;
+                        goto out_error;
+                }
+
+                /* We've got a live one. */
+                spin_unlock(&ip->i_flags_lock);
+                rcu_read_unlock();
+                trace_xfs_iget_hit(ip);
+        }
+
+        if (lock_flags != 0)
+                xfs_ilock(ip, lock_flags);
+
+        xfs_iflags_clear(ip, XFS_ISTALE);
+        XFS_STATS_INC(xs_ig_found);
+
+        return 0;
+
+out_error:
+        spin_unlock(&ip->i_flags_lock);
+        rcu_read_unlock();
+        return error;
+}
+
+
+static int
+xfs_iget_cache_miss(
+        struct xfs_mount        *mp,
+        struct xfs_perag        *pag,
+        xfs_trans_t             *tp,
+        xfs_ino_t               ino,
+        struct xfs_inode        **ipp,
+        int                     flags,
+        int                     lock_flags)
+{
+        struct xfs_inode        *ip;
+        int                     error;
+        xfs_agino_t             agino = XFS_INO_TO_AGINO(mp, ino);
+
+        ip = xfs_inode_alloc(mp, ino);
+        if (!ip)
+                return ENOMEM;
+
+        error = xfs_iread(mp, tp, ip, flags);
+        if (error)
+                goto out_destroy;
+
+        trace_xfs_iget_miss(ip);
+
+        if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) {
+                error = ENOENT;
+                goto out_destroy;
+        }
+
+        /*
+         * Preload the radix tree so we can insert safely under the
+         * write spinlock. Note that we cannot sleep inside the preload
+         * region.
+         */
+        if (radix_tree_preload(GFP_KERNEL)) {
+                error = EAGAIN;
+                goto out_destroy;
+        }
+
+        /*
+         * Because the inode hasn't been added to the radix-tree yet it can't
+         * be found by another thread, so we can do the non-sleeping lock here.
+         */
+        if (lock_flags) {
+                if (!xfs_ilock_nowait(ip, lock_flags))
+                        BUG();
+        }
+
+        spin_lock(&pag->pag_ici_lock);
+
+        /* insert the new inode */
+        error = radix_tree_insert(&pag->pag_ici_root, agino, ip);
+        if (unlikely(error)) {
+                WARN_ON(error != -EEXIST);
+                XFS_STATS_INC(xs_ig_dup);
+                error = EAGAIN;
+                goto out_preload_end;
+        }
+
+        /* These values _must_ be set before releasing the radix tree lock! */
+        ip->i_udquot = ip->i_gdquot = NULL;
+        xfs_iflags_set(ip, XFS_INEW);
+
+        spin_unlock(&pag->pag_ici_lock);
+        radix_tree_preload_end();
+
+        *ipp = ip;
+        return 0;
+
+out_preload_end:
+        spin_unlock(&pag->pag_ici_lock);
+        radix_tree_preload_end();
+        if (lock_flags)
+                xfs_iunlock(ip, lock_flags);
+out_destroy:
+        __destroy_inode(VFS_I(ip));
+        xfs_inode_free(ip);
+        return error;
+}
+
+/*
+ * Look up an inode by number in the given file system.
+ * The inode is looked up in the cache held in each AG.
+ * If the inode is found in the cache, initialise the vfs inode
+ * if necessary.
+ *
+ * If it is not in core, read it in from the file system's device,
+ * add it to the cache and initialise the vfs inode.
+ *
+ * The inode is locked according to the value of the lock_flags parameter.
+ * This flag parameter indicates how and if the inode's IO lock and inode lock
+ * should be taken.
+ *
+ * mp -- the mount point structure for the current file system.  It points
+ *       to the inode hash table.
+ * tp -- a pointer to the current transaction if there is one.  This is
+ *       simply passed through to the xfs_iread() call.
+ * ino -- the number of the inode desired.  This is the unique identifier
+ *        within the file system for the inode being requested.
+ * lock_flags -- flags indicating how to lock the inode.  See the comment
+ *               for xfs_ilock() for a list of valid values.
+ */
+int
+xfs_iget(
+        xfs_mount_t     *mp,
+        xfs_trans_t     *tp,
+        xfs_ino_t       ino,
+        uint            flags,
+        uint            lock_flags,
+        xfs_inode_t     **ipp)
+{
+        xfs_inode_t     *ip;
+        int             error;
+        xfs_perag_t     *pag;
+        xfs_agino_t     agino;
+
+        /* reject inode numbers outside existing AGs */
+        if (!ino || XFS_INO_TO_AGNO(mp, ino) >= mp->m_sb.sb_agcount)
+                return EINVAL;
+
+        /* get the perag structure and ensure that it's inode capable */
+        pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ino));
+        agino = XFS_INO_TO_AGINO(mp, ino);
+
+again:
+        error = 0;
+        rcu_read_lock();
+        ip = radix_tree_lookup(&pag->pag_ici_root, agino);
+
+        if (ip) {
+                error = xfs_iget_cache_hit(pag, ip, ino, flags, lock_flags);
+                if (error)
+                        goto out_error_or_again;
+        } else {
+                rcu_read_unlock();
+                XFS_STATS_INC(xs_ig_missed);
+
+                error = xfs_iget_cache_miss(mp, pag, tp, ino, &ip,
+                                                        flags, lock_flags);
+                if (error)
+                        goto out_error_or_again;
+        }
+        xfs_perag_put(pag);
+
+        *ipp = ip;
+
+        ASSERT(ip->i_df.if_ext_max ==
+               XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t));
+        /*
+         * If we have a real type for an on-disk inode, we can set ops(&unlock)
+         * now.  If it's a new inode being created, xfs_ialloc will handle it.
+         */
+        if (xfs_iflags_test(ip, XFS_INEW) && ip->i_d.di_mode != 0)
+                xfs_setup_inode(ip);
+        return 0;
+
+out_error_or_again:
+        if (error == EAGAIN) {
+                delay(1);
+                goto again;
+        }
+        xfs_perag_put(pag);
+        return error;
+}
+
+/*
+ * This is a wrapper routine around the xfs_ilock() routine
+ * used to centralize some grungy code.  It is used in places
+ * that wish to lock the inode solely for reading the extents.
+ * The reason these places can't just call xfs_ilock(SHARED)
+ * is that the inode lock also guards to bringing in of the
+ * extents from disk for a file in b-tree format.  If the inode
+ * is in b-tree format, then we need to lock the inode exclusively
+ * until the extents are read in.  Locking it exclusively all
+ * the time would limit our parallelism unnecessarily, though.
+ * What we do instead is check to see if the extents have been
+ * read in yet, and only lock the inode exclusively if they
+ * have not.
+ *
+ * The function returns a value which should be given to the
+ * corresponding xfs_iunlock_map_shared().  This value is
+ * the mode in which the lock was actually taken.
+ */
+uint
+xfs_ilock_map_shared(
+        xfs_inode_t     *ip)
+{
+        uint    lock_mode;
+
+        if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) &&
+            ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) {
+                lock_mode = XFS_ILOCK_EXCL;
+        } else {
+                lock_mode = XFS_ILOCK_SHARED;
+        }
+
+        xfs_ilock(ip, lock_mode);
+
+        return lock_mode;
+}
+
+/*
+ * This is simply the unlock routine to go with xfs_ilock_map_shared().
+ * All it does is call xfs_iunlock() with the given lock_mode.
+ */
+void
+xfs_iunlock_map_shared(
+        xfs_inode_t     *ip,
+        unsigned int    lock_mode)
+{
+        xfs_iunlock(ip, lock_mode);
+}
+
+/*
+ * The xfs inode contains 2 locks: a multi-reader lock called the
+ * i_iolock and a multi-reader lock called the i_lock.  This routine
+ * allows either or both of the locks to be obtained.
+ *
+ * The 2 locks should always be ordered so that the IO lock is
+ * obtained first in order to prevent deadlock.
+ *
+ * ip -- the inode being locked
+ * lock_flags -- this parameter indicates the inode's locks
+ *       to be locked.  It can be:
+ *              XFS_IOLOCK_SHARED,
+ *              XFS_IOLOCK_EXCL,
+ *              XFS_ILOCK_SHARED,
+ *              XFS_ILOCK_EXCL,
+ *              XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
+ *              XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
+ *              XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
+ *              XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
+ */
+void
+xfs_ilock(
+        xfs_inode_t             *ip,
+        uint                    lock_flags)
+{
+        /*
+         * You can't set both SHARED and EXCL for the same lock,
+         * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
+         * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
+         */
+        ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
+               (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
+        ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+               (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+        ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
+
+        if (lock_flags & XFS_IOLOCK_EXCL)
+                mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
+        else if (lock_flags & XFS_IOLOCK_SHARED)
+                mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
+
+        if (lock_flags & XFS_ILOCK_EXCL)
+                mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
+        else if (lock_flags & XFS_ILOCK_SHARED)
+                mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
+
+        trace_xfs_ilock(ip, lock_flags, _RET_IP_);
+}
+
+/*
+ * This is just like xfs_ilock(), except that the caller
+ * is guaranteed not to sleep.  It returns 1 if it gets
+ * the requested locks and 0 otherwise.  If the IO lock is
+ * obtained but the inode lock cannot be, then the IO lock
+ * is dropped before returning.
+ *
+ * ip -- the inode being locked
+ * lock_flags -- this parameter indicates the inode's locks to be
+ *       to be locked.  See the comment for xfs_ilock() for a list
+ *       of valid values.
+ */
+int
+xfs_ilock_nowait(
+        xfs_inode_t             *ip,
+        uint                    lock_flags)
+{
+        /*
+         * You can't set both SHARED and EXCL for the same lock,
+         * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
+         * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
+         */
+        ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
+               (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
+        ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+               (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+        ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
+
+        if (lock_flags & XFS_IOLOCK_EXCL) {
+                if (!mrtryupdate(&ip->i_iolock))
+                        goto out;
+        } else if (lock_flags & XFS_IOLOCK_SHARED) {
+                if (!mrtryaccess(&ip->i_iolock))
+                        goto out;
+        }
+        if (lock_flags & XFS_ILOCK_EXCL) {
+                if (!mrtryupdate(&ip->i_lock))
+                        goto out_undo_iolock;
+        } else if (lock_flags & XFS_ILOCK_SHARED) {
+                if (!mrtryaccess(&ip->i_lock))
+                        goto out_undo_iolock;
+        }
+        trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);
+        return 1;
+
+ out_undo_iolock:
+        if (lock_flags & XFS_IOLOCK_EXCL)
+                mrunlock_excl(&ip->i_iolock);
+        else if (lock_flags & XFS_IOLOCK_SHARED)
+                mrunlock_shared(&ip->i_iolock);
+ out:
+        return 0;
+}
+
+/*
+ * xfs_iunlock() is used to drop the inode locks acquired with
+ * xfs_ilock() and xfs_ilock_nowait().  The caller must pass
+ * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
+ * that we know which locks to drop.
+ *
+ * ip -- the inode being unlocked
+ * lock_flags -- this parameter indicates the inode's locks to be
+ *       to be unlocked.  See the comment for xfs_ilock() for a list
+ *       of valid values for this parameter.
+ *
+ */
+void
+xfs_iunlock(
+        xfs_inode_t             *ip,
+        uint                    lock_flags)
+{
+        /*
+         * You can't set both SHARED and EXCL for the same lock,
+         * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
+         * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
+         */
+        ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
+               (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
+        ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+               (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+        ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY |
+                        XFS_LOCK_DEP_MASK)) == 0);
+        ASSERT(lock_flags != 0);
+
+        if (lock_flags & XFS_IOLOCK_EXCL)
+                mrunlock_excl(&ip->i_iolock);
+        else if (lock_flags & XFS_IOLOCK_SHARED)
+                mrunlock_shared(&ip->i_iolock);
+
+        if (lock_flags & XFS_ILOCK_EXCL)
+                mrunlock_excl(&ip->i_lock);
+        else if (lock_flags & XFS_ILOCK_SHARED)
+                mrunlock_shared(&ip->i_lock);
+
+        if ((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) &&
+            !(lock_flags & XFS_IUNLOCK_NONOTIFY) && ip->i_itemp) {
+                /*
+                 * Let the AIL know that this item has been unlocked in case
+                 * it is in the AIL and anyone is waiting on it.  Don't do
+                 * this if the caller has asked us not to.
+                 */
+                xfs_trans_unlocked_item(ip->i_itemp->ili_item.li_ailp,
+                                        (xfs_log_item_t*)(ip->i_itemp));
+        }
+        trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
+}
+
+/*
+ * give up write locks.  the i/o lock cannot be held nested
+ * if it is being demoted.
+ */
+void
+xfs_ilock_demote(
+        xfs_inode_t             *ip,
+        uint                    lock_flags)
+{
+        ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL));
+        ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
+
+        if (lock_flags & XFS_ILOCK_EXCL)
+                mrdemote(&ip->i_lock);
+        if (lock_flags & XFS_IOLOCK_EXCL)
+                mrdemote(&ip->i_iolock);
+
+        trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
+}
+
+#ifdef DEBUG
+int
+xfs_isilocked(
+        xfs_inode_t             *ip,
+        uint                    lock_flags)
+{
+        if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
+                if (!(lock_flags & XFS_ILOCK_SHARED))
+                        return !!ip->i_lock.mr_writer;
+                return rwsem_is_locked(&ip->i_lock.mr_lock);
+        }
+
+        if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
+                if (!(lock_flags & XFS_IOLOCK_SHARED))
+                        return !!ip->i_iolock.mr_writer;
+                return rwsem_is_locked(&ip->i_iolock.mr_lock);
+        }
+
+        ASSERT(0);
+        return 0;
+}
+#endif
diff --git a/fs/xfs/xfs_qm_stats.c b/fs/xfs/xfs_qm_stats.c
new file mode 100644
index 00000000000..8671a0b3264
--- /dev/null
+++ b/fs/xfs/xfs_qm_stats.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_alloc.h"
+#include "xfs_quota.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_inode.h"
+#include "xfs_itable.h"
+#include "xfs_bmap.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_attr.h"
+#include "xfs_buf_item.h"
+#include "xfs_qm.h"
+
+struct xqmstats xqmstats;
+
+static int xqm_proc_show(struct seq_file *m, void *v)
+{
+        /* maximum; incore; ratio free to inuse; freelist */
+        seq_printf(m, "%d\t%d\t%d\t%u\n",
+                        ndquot,
+                        xfs_Gqm? atomic_read(&xfs_Gqm->qm_totaldquots) : 0,
+                        xfs_Gqm? xfs_Gqm->qm_dqfree_ratio : 0,
+                        xfs_Gqm? xfs_Gqm->qm_dqfrlist_cnt : 0);
+        return 0;
+}
+
+static int xqm_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, xqm_proc_show, NULL);
+}
+
+static const struct file_operations xqm_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = xqm_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int xqmstat_proc_show(struct seq_file *m, void *v)
+{
+        /* quota performance statistics */
+        seq_printf(m, "qm %u %u %u %u %u %u %u %u\n",
+                        xqmstats.xs_qm_dqreclaims,
+                        xqmstats.xs_qm_dqreclaim_misses,
+                        xqmstats.xs_qm_dquot_dups,
+                        xqmstats.xs_qm_dqcachemisses,
+                        xqmstats.xs_qm_dqcachehits,
+                        xqmstats.xs_qm_dqwants,
+                        xqmstats.xs_qm_dqshake_reclaims,
+                        xqmstats.xs_qm_dqinact_reclaims);
+        return 0;
+}
+
+static int xqmstat_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, xqmstat_proc_show, NULL);
+}
+
+static const struct file_operations xqmstat_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = xqmstat_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+void
+xfs_qm_init_procfs(void)
+{
+        proc_create("fs/xfs/xqmstat", 0, NULL, &xqmstat_proc_fops);
+        proc_create("fs/xfs/xqm", 0, NULL, &xqm_proc_fops);
+}
+
+void
+xfs_qm_cleanup_procfs(void)
+{
+        remove_proc_entry("fs/xfs/xqm", NULL);
+        remove_proc_entry("fs/xfs/xqmstat", NULL);
+}
diff --git a/fs/xfs/xfs_qm_stats.h b/fs/xfs/xfs_qm_stats.h
new file mode 100644
index 00000000000..5b964fc0dc0
--- /dev/null
+++ b/fs/xfs/xfs_qm_stats.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2002 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef __XFS_QM_STATS_H__
+#define __XFS_QM_STATS_H__
+
+#if defined(CONFIG_PROC_FS) && !defined(XFS_STATS_OFF)
+
+/*
+ * XQM global statistics
+ */
+struct xqmstats {
+        __uint32_t              xs_qm_dqreclaims;
+        __uint32_t              xs_qm_dqreclaim_misses;
+        __uint32_t              xs_qm_dquot_dups;
+        __uint32_t              xs_qm_dqcachemisses;
+        __uint32_t              xs_qm_dqcachehits;
+        __uint32_t              xs_qm_dqwants;
+        __uint32_t              xs_qm_dqshake_reclaims;
+        __uint32_t              xs_qm_dqinact_reclaims;
+};
+
+extern struct xqmstats xqmstats;
+
+# define XQM_STATS_INC(count)   ( (count)++ )
+
+extern void xfs_qm_init_procfs(void);
+extern void xfs_qm_cleanup_procfs(void);
+
+#else
+
+# define XQM_STATS_INC(count)   do { } while (0)
+
+static inline void xfs_qm_init_procfs(void) { };
+static inline void xfs_qm_cleanup_procfs(void) { };
+
+#endif
+
+#endif  /* __XFS_QM_STATS_H__ */
diff --git a/fs/xfs/xfs_rw.c b/fs/xfs/xfs_rw.c
new file mode 100644
index 00000000000..c96a8a05ac0
--- /dev/null
+++ b/fs/xfs/xfs_rw.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_types.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_error.h"
+#include "xfs_rw.h"
+
+/*
+ * Force a shutdown of the filesystem instantly while keeping
+ * the filesystem consistent. We don't do an unmount here; just shutdown
+ * the shop, make sure that absolutely nothing persistent happens to
+ * this filesystem after this point.
+ */
+void
+xfs_do_force_shutdown(
+        xfs_mount_t     *mp,
+        int             flags,
+        char            *fname,
+        int             lnnum)
+{
+        int             logerror;
+
+        logerror = flags & SHUTDOWN_LOG_IO_ERROR;
+
+        if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
+                xfs_notice(mp,
+        "%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
+                        __func__, flags, lnnum, fname, __return_address);
+        }
+        /*
+         * No need to duplicate efforts.
+         */
+        if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
+                return;
+
+        /*
+         * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
+         * queue up anybody new on the log reservations, and wakes up
+         * everybody who's sleeping on log reservations to tell them
+         * the bad news.
+         */
+        if (xfs_log_force_umount(mp, logerror))
+                return;
+
+        if (flags & SHUTDOWN_CORRUPT_INCORE) {
+                xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
+    "Corruption of in-memory data detected.  Shutting down filesystem");
+                if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
+                        xfs_stack_trace();
+        } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
+                if (logerror) {
+                        xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
+                "Log I/O Error Detected.  Shutting down filesystem");
+                } else if (flags & SHUTDOWN_DEVICE_REQ) {
+                        xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
+                "All device paths lost.  Shutting down filesystem");
+                } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
+                        xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
+                "I/O Error Detected. Shutting down filesystem");
+                }
+        }
+        if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
+                xfs_alert(mp,
+        "Please umount the filesystem and rectify the problem(s)");
+        }
+}
+
+/*
+ * Prints out an ALERT message about I/O error.
+ */
+void
+xfs_ioerror_alert(
+        char                    *func,
+        struct xfs_mount        *mp,
+        xfs_buf_t               *bp,
+        xfs_daddr_t             blkno)
+{
+        xfs_alert(mp,
+                 "I/O error occurred: meta-data dev %s block 0x%llx"
+                 "       (\"%s\") error %d buf count %zd",
+                xfs_buf_target_name(bp->b_target),
+                (__uint64_t)blkno, func,
+                bp->b_error, XFS_BUF_COUNT(bp));
+}
+
+/*
+ * This isn't an absolute requirement, but it is
+ * just a good idea to call xfs_read_buf instead of
+ * directly doing a read_buf call. For one, we shouldn't
+ * be doing this disk read if we are in SHUTDOWN state anyway,
+ * so this stops that from happening. Secondly, this does all
+ * the error checking stuff and the brelse if appropriate for
+ * the caller, so the code can be a little leaner.
+ */
+
+int
+xfs_read_buf(
+        struct xfs_mount *mp,
+        xfs_buftarg_t    *target,
+        xfs_daddr_t      blkno,
+        int              len,
+        uint             flags,
+        xfs_buf_t        **bpp)
+{
+        xfs_buf_t        *bp;
+        int              error;
+
+        if (!flags)
+                flags = XBF_LOCK | XBF_MAPPED;
+
+        bp = xfs_buf_read(target, blkno, len, flags);
+        if (!bp)
+                return XFS_ERROR(EIO);
+        error = bp->b_error;
+        if (!error && !XFS_FORCED_SHUTDOWN(mp)) {
+                *bpp = bp;
+        } else {
+                *bpp = NULL;
+                if (error) {
+                        xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp));
+                } else {
+                        error = XFS_ERROR(EIO);
+                }
+                if (bp) {
+                        XFS_BUF_UNDONE(bp);
+                        XFS_BUF_UNDELAYWRITE(bp);
+                        XFS_BUF_STALE(bp);
+                        /*
+                         * brelse clears B_ERROR and b_error
+                         */
+                        xfs_buf_relse(bp);
+                }
+        }
+        return (error);
+}
+
+/*
+ * helper function to extract extent size hint from inode
+ */
+xfs_extlen_t
+xfs_get_extsz_hint(
+        struct xfs_inode        *ip)
+{
+        if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize)
+                return ip->i_d.di_extsize;
+        if (XFS_IS_REALTIME_INODE(ip))
+                return ip->i_mount->m_sb.sb_rextsize;
+        return 0;
+}
diff --git a/fs/xfs/xfs_rw.h b/fs/xfs/xfs_rw.h
new file mode 100644
index 00000000000..11c41ec6ed7
--- /dev/null
+++ b/fs/xfs/xfs_rw.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef __XFS_RW_H__
+#define __XFS_RW_H__
+
+struct xfs_buf;
+struct xfs_inode;
+struct xfs_mount;
+
+/*
+ * Convert the given file system block to a disk block.
+ * We have to treat it differently based on whether the
+ * file is a real time file or not, because the bmap code
+ * does.
+ */
+static inline xfs_daddr_t
+xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
+{
+        return (XFS_IS_REALTIME_INODE(ip) ? \
+                 (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
+                 XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
+}
+
+/*
+ * Prototypes for functions in xfs_rw.c.
+ */
+extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
+                        xfs_daddr_t blkno, int len, uint flags,
+                        struct xfs_buf **bpp);
+extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
+                                xfs_buf_t *bp, xfs_daddr_t blkno);
+extern xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
+
+#endif /* __XFS_RW_H__ */
diff --git a/fs/xfs/xfs_sync.c b/fs/xfs/xfs_sync.c
new file mode 100644
index 00000000000..4604f90f86a
--- /dev/null
+++ b/fs/xfs/xfs_sync.c
@@ -0,0 +1,1065 @@
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_types.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_trans_priv.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_inode.h"
+#include "xfs_dinode.h"
+#include "xfs_error.h"
+#include "xfs_filestream.h"
+#include "xfs_vnodeops.h"
+#include "xfs_inode_item.h"
+#include "xfs_quota.h"
+#include "xfs_trace.h"
+#include "xfs_fsops.h"
+
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+
+struct workqueue_struct *xfs_syncd_wq;  /* sync workqueue */
+
+/*
+ * The inode lookup is done in batches to keep the amount of lock traffic and
+ * radix tree lookups to a minimum. The batch size is a trade off between
+ * lookup reduction and stack usage. This is in the reclaim path, so we can't
+ * be too greedy.
+ */
+#define XFS_LOOKUP_BATCH        32
+
+STATIC int
+xfs_inode_ag_walk_grab(
+        struct xfs_inode        *ip)
+{
+        struct inode            *inode = VFS_I(ip);
+
+        ASSERT(rcu_read_lock_held());
+
+        /*
+         * check for stale RCU freed inode
+         *
+         * If the inode has been reallocated, it doesn't matter if it's not in
+         * the AG we are walking - we are walking for writeback, so if it
+         * passes all the "valid inode" checks and is dirty, then we'll write
+         * it back anyway.  If it has been reallocated and still being
+         * initialised, the XFS_INEW check below will catch it.
+         */
+        spin_lock(&ip->i_flags_lock);
+        if (!ip->i_ino)
+                goto out_unlock_noent;
+
+        /* avoid new or reclaimable inodes. Leave for reclaim code to flush */
+        if (__xfs_iflags_test(ip, XFS_INEW | XFS_IRECLAIMABLE | XFS_IRECLAIM))
+                goto out_unlock_noent;
+        spin_unlock(&ip->i_flags_lock);
+
+        /* nothing to sync during shutdown */
+        if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+                return EFSCORRUPTED;
+
+        /* If we can't grab the inode, it must on it's way to reclaim. */
+        if (!igrab(inode))
+                return ENOENT;
+
+        if (is_bad_inode(inode)) {
+                IRELE(ip);
+                return ENOENT;
+        }
+
+        /* inode is valid */
+        return 0;
+
+out_unlock_noent:
+        spin_unlock(&ip->i_flags_lock);
+        return ENOENT;
+}
+
+STATIC int
+xfs_inode_ag_walk(
+        struct xfs_mount        *mp,
+        struct xfs_perag        *pag,
+        int                     (*execute)(struct xfs_inode *ip,
+                                           struct xfs_perag *pag, int flags),
+        int                     flags)
+{
+        uint32_t                first_index;
+        int                     last_error = 0;
+        int                     skipped;
+        int                     done;
+        int                     nr_found;
+
+restart:
+        done = 0;
+        skipped = 0;
+        first_index = 0;
+        nr_found = 0;
+        do {
+                struct xfs_inode *batch[XFS_LOOKUP_BATCH];
+                int             error = 0;
+                int             i;
+
+                rcu_read_lock();
+                nr_found = radix_tree_gang_lookup(&pag->pag_ici_root,
+                                        (void **)batch, first_index,
+                                        XFS_LOOKUP_BATCH);
+                if (!nr_found) {
+                        rcu_read_unlock();
+                        break;
+                }
+
+                /*
+                 * Grab the inodes before we drop the lock. if we found
+                 * nothing, nr == 0 and the loop will be skipped.
+                 */
+                for (i = 0; i < nr_found; i++) {
+                        struct xfs_inode *ip = batch[i];
+
+                        if (done || xfs_inode_ag_walk_grab(ip))
+                                batch[i] = NULL;
+
+                        /*
+                         * Update the index for the next lookup. Catch
+                         * overflows into the next AG range which can occur if
+                         * we have inodes in the last block of the AG and we
+                         * are currently pointing to the last inode.
+                         *
+                         * Because we may see inodes that are from the wrong AG
+                         * due to RCU freeing and reallocation, only update the
+                         * index if it lies in this AG. It was a race that lead
+                         * us to see this inode, so another lookup from the
+                         * same index will not find it again.
+                         */
+                        if (XFS_INO_TO_AGNO(mp, ip->i_ino) != pag->pag_agno)
+                                continue;
+                        first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);
+                        if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino))
+                                done = 1;
+                }
+
+                /* unlock now we've grabbed the inodes. */
+                rcu_read_unlock();
+
+                for (i = 0; i < nr_found; i++) {
+                        if (!batch[i])
+                                continue;
+                        error = execute(batch[i], pag, flags);
+                        IRELE(batch[i]);
+                        if (error == EAGAIN) {
+                                skipped++;
+                                continue;
+                        }
+                        if (error && last_error != EFSCORRUPTED)
+                                last_error = error;
+                }
+
+                /* bail out if the filesystem is corrupted.  */
+                if (error == EFSCORRUPTED)
+                        break;
+
+                cond_resched();
+
+        } while (nr_found && !done);
+
+        if (skipped) {
+                delay(1);
+                goto restart;
+        }
+        return last_error;
+}
+
+int
+xfs_inode_ag_iterator(
+        struct xfs_mount        *mp,
+        int                     (*execute)(struct xfs_inode *ip,
+                                           struct xfs_perag *pag, int flags),
+        int                     flags)
+{
+        struct xfs_perag        *pag;
+        int                     error = 0;
+        int                     last_error = 0;
+        xfs_agnumber_t          ag;
+
+        ag = 0;
+        while ((pag = xfs_perag_get(mp, ag))) {
+                ag = pag->pag_agno + 1;
+                error = xfs_inode_ag_walk(mp, pag, execute, flags);
+                xfs_perag_put(pag);
+                if (error) {
+                        last_error = error;
+                        if (error == EFSCORRUPTED)
+                                break;
+                }
+        }
+        return XFS_ERROR(last_error);
+}
+
+STATIC int
+xfs_sync_inode_data(
+        struct xfs_inode        *ip,
+        struct xfs_perag        *pag,
+        int                     flags)
+{
+        struct inode            *inode = VFS_I(ip);
+        struct address_space *mapping = inode->i_mapping;
+        int                     error = 0;
+
+        if (!mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
+                goto out_wait;
+
+        if (!xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED)) {
+                if (flags & SYNC_TRYLOCK)
+                        goto out_wait;
+                xfs_ilock(ip, XFS_IOLOCK_SHARED);
+        }
+
+        error = xfs_flush_pages(ip, 0, -1, (flags & SYNC_WAIT) ?
+                                0 : XBF_ASYNC, FI_NONE);
+        xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+
+ out_wait:
+        if (flags & SYNC_WAIT)
+                xfs_ioend_wait(ip);
+        return error;
+}
+
+STATIC int
+xfs_sync_inode_attr(
+        struct xfs_inode        *ip,
+        struct xfs_perag        *pag,
+        int                     flags)
+{
+        int                     error = 0;
+
+        xfs_ilock(ip, XFS_ILOCK_SHARED);
+        if (xfs_inode_clean(ip))
+                goto out_unlock;
+        if (!xfs_iflock_nowait(ip)) {
+                if (!(flags & SYNC_WAIT))
+                        goto out_unlock;
+                xfs_iflock(ip);
+        }
+
+        if (xfs_inode_clean(ip)) {
+                xfs_ifunlock(ip);
+                goto out_unlock;
+        }
+
+        error = xfs_iflush(ip, flags);
+
+        /*
+         * We don't want to try again on non-blocking flushes that can't run
+         * again immediately. If an inode really must be written, then that's
+         * what the SYNC_WAIT flag is for.
+         */
+        if (error == EAGAIN) {
+                ASSERT(!(flags & SYNC_WAIT));
+                error = 0;
+        }
+
+ out_unlock:
+        xfs_iunlock(ip, XFS_ILOCK_SHARED);
+        return error;
+}
+
+/*
+ * Write out pagecache data for the whole filesystem.
+ */
+STATIC int
+xfs_sync_data(
+        struct xfs_mount        *mp,
+        int                     flags)
+{
+        int                     error;
+
+        ASSERT((flags & ~(SYNC_TRYLOCK|SYNC_WAIT)) == 0);
+
+        error = xfs_inode_ag_iterator(mp, xfs_sync_inode_data, flags);
+        if (error)
+                return XFS_ERROR(error);
+
+        xfs_log_force(mp, (flags & SYNC_WAIT) ? XFS_LOG_SYNC : 0);
+        return 0;
+}
+
+/*
+ * Write out inode metadata (attributes) for the whole filesystem.
+ */
+STATIC int
+xfs_sync_attr(
+        struct xfs_mount        *mp,
+        int                     flags)
+{
+        ASSERT((flags & ~SYNC_WAIT) == 0);
+
+        return xfs_inode_ag_iterator(mp, xfs_sync_inode_attr, flags);
+}
+
+STATIC int
+xfs_sync_fsdata(
+        struct xfs_mount        *mp)
+{
+        struct xfs_buf          *bp;
+
+        /*
+         * If the buffer is pinned then push on the log so we won't get stuck
+         * waiting in the write for someone, maybe ourselves, to flush the log.
+         *
+         * Even though we just pushed the log above, we did not have the
+         * superblock buffer locked at that point so it can become pinned in
+         * between there and here.
+         */
+        bp = xfs_getsb(mp, 0);
+        if (xfs_buf_ispinned(bp))
+                xfs_log_force(mp, 0);
+
+        return xfs_bwrite(mp, bp);
+}
+
+/*
+ * When remounting a filesystem read-only or freezing the filesystem, we have
+ * two phases to execute. This first phase is syncing the data before we
+ * quiesce the filesystem, and the second is flushing all the inodes out after
+ * we've waited for all the transactions created by the first phase to
+ * complete. The second phase ensures that the inodes are written to their
+ * location on disk rather than just existing in transactions in the log. This
+ * means after a quiesce there is no log replay required to write the inodes to
+ * disk (this is the main difference between a sync and a quiesce).
+ */
+/*
+ * First stage of freeze - no writers will make progress now we are here,
+ * so we flush delwri and delalloc buffers here, then wait for all I/O to
+ * complete.  Data is frozen at that point. Metadata is not frozen,
+ * transactions can still occur here so don't bother flushing the buftarg
+ * because it'll just get dirty again.
+ */
+int
+xfs_quiesce_data(
+        struct xfs_mount        *mp)
+{
+        int                     error, error2 = 0;
+
+        xfs_qm_sync(mp, SYNC_TRYLOCK);
+        xfs_qm_sync(mp, SYNC_WAIT);
+
+        /* force out the newly dirtied log buffers */
+        xfs_log_force(mp, XFS_LOG_SYNC);
+
+        /* write superblock and hoover up shutdown errors */
+        error = xfs_sync_fsdata(mp);
+
+        /* make sure all delwri buffers are written out */
+        xfs_flush_buftarg(mp->m_ddev_targp, 1);
+
+        /* mark the log as covered if needed */
+        if (xfs_log_need_covered(mp))
+                error2 = xfs_fs_log_dummy(mp);
+
+        /* flush data-only devices */
+        if (mp->m_rtdev_targp)
+                XFS_bflush(mp->m_rtdev_targp);
+
+        return error ? error : error2;
+}
+
+STATIC void
+xfs_quiesce_fs(
+        struct xfs_mount        *mp)
+{
+        int     count = 0, pincount;
+
+        xfs_reclaim_inodes(mp, 0);
+        xfs_flush_buftarg(mp->m_ddev_targp, 0);
+
+        /*
+         * This loop must run at least twice.  The first instance of the loop
+         * will flush most meta data but that will generate more meta data
+         * (typically directory updates).  Which then must be flushed and
+         * logged before we can write the unmount record. We also so sync
+         * reclaim of inodes to catch any that the above delwri flush skipped.
+         */
+        do {
+                xfs_reclaim_inodes(mp, SYNC_WAIT);
+                xfs_sync_attr(mp, SYNC_WAIT);
+                pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
+                if (!pincount) {
+                        delay(50);
+                        count++;
+                }
+        } while (count < 2);
+}
+
+/*
+ * Second stage of a quiesce. The data is already synced, now we have to take
+ * care of the metadata. New transactions are already blocked, so we need to
+ * wait for any remaining transactions to drain out before proceeding.
+ */
+void
+xfs_quiesce_attr(
+        struct xfs_mount        *mp)
+{
+        int     error = 0;
+
+        /* wait for all modifications to complete */
+        while (atomic_read(&mp->m_active_trans) > 0)
+                delay(100);
+
+        /* flush inodes and push all remaining buffers out to disk */
+        xfs_quiesce_fs(mp);
+
+        /*
+         * Just warn here till VFS can correctly support
+         * read-only remount without racing.
+         */
+        WARN_ON(atomic_read(&mp->m_active_trans) != 0);
+
+        /* Push the superblock and write an unmount record */
+        error = xfs_log_sbcount(mp);
+        if (error)
+                xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
+                                "Frozen image may not be consistent.");
+        xfs_log_unmount_write(mp);
+        xfs_unmountfs_writesb(mp);
+}
+
+static void
+xfs_syncd_queue_sync(
+        struct xfs_mount        *mp)
+{
+        queue_delayed_work(xfs_syncd_wq, &mp->m_sync_work,
+                                msecs_to_jiffies(xfs_syncd_centisecs * 10));
+}
+
+/*
+ * Every sync period we need to unpin all items, reclaim inodes and sync
+ * disk quotas.  We might need to cover the log to indicate that the
+ * filesystem is idle and not frozen.
+ */
+STATIC void
+xfs_sync_worker(
+        struct work_struct *work)
+{
+        struct xfs_mount *mp = container_of(to_delayed_work(work),
+                                        struct xfs_mount, m_sync_work);
+        int             error;
+
+        if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
+                /* dgc: errors ignored here */
+                if (mp->m_super->s_frozen == SB_UNFROZEN &&
+                    xfs_log_need_covered(mp))
+                        error = xfs_fs_log_dummy(mp);
+                else
+                        xfs_log_force(mp, 0);
+                error = xfs_qm_sync(mp, SYNC_TRYLOCK);
+
+                /* start pushing all the metadata that is currently dirty */
+                xfs_ail_push_all(mp->m_ail);
+        }
+
+        /* queue us up again */
+        xfs_syncd_queue_sync(mp);
+}
+
+/*
+ * Queue a new inode reclaim pass if there are reclaimable inodes and there
+ * isn't a reclaim pass already in progress. By default it runs every 5s based
+ * on the xfs syncd work default of 30s. Perhaps this should have it's own
+ * tunable, but that can be done if this method proves to be ineffective or too
+ * aggressive.
+ */
+static void
+xfs_syncd_queue_reclaim(
+        struct xfs_mount        *mp)
+{
+
+        /*
+         * We can have inodes enter reclaim after we've shut down the syncd
+         * workqueue during unmount, so don't allow reclaim work to be queued
+         * during unmount.
+         */
+        if (!(mp->m_super->s_flags & MS_ACTIVE))
+                return;
+
+        rcu_read_lock();
+        if (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_RECLAIM_TAG)) {
+                queue_delayed_work(xfs_syncd_wq, &mp->m_reclaim_work,
+                        msecs_to_jiffies(xfs_syncd_centisecs / 6 * 10));
+        }
+        rcu_read_unlock();
+}
+
+/*
+ * This is a fast pass over the inode cache to try to get reclaim moving on as
+ * many inodes as possible in a short period of time. It kicks itself every few
+ * seconds, as well as being kicked by the inode cache shrinker when memory
+ * goes low. It scans as quickly as possible avoiding locked inodes or those
+ * already being flushed, and once done schedules a future pass.
+ */
+STATIC void
+xfs_reclaim_worker(
+        struct work_struct *work)
+{
+        struct xfs_mount *mp = container_of(to_delayed_work(work),
+                                        struct xfs_mount, m_reclaim_work);
+
+        xfs_reclaim_inodes(mp, SYNC_TRYLOCK);
+        xfs_syncd_queue_reclaim(mp);
+}
+
+/*
+ * Flush delayed allocate data, attempting to free up reserved space
+ * from existing allocations.  At this point a new allocation attempt
+ * has failed with ENOSPC and we are in the process of scratching our
+ * heads, looking about for more room.
+ *
+ * Queue a new data flush if there isn't one already in progress and
+ * wait for completion of the flush. This means that we only ever have one
+ * inode flush in progress no matter how many ENOSPC events are occurring and
+ * so will prevent the system from bogging down due to every concurrent
+ * ENOSPC event scanning all the active inodes in the system for writeback.
+ */
+void
+xfs_flush_inodes(
+        struct xfs_inode        *ip)
+{
+        struct xfs_mount        *mp = ip->i_mount;
+
+        queue_work(xfs_syncd_wq, &mp->m_flush_work);
+        flush_work_sync(&mp->m_flush_work);
+}
+
+STATIC void
+xfs_flush_worker(
+        struct work_struct *work)
+{
+        struct xfs_mount *mp = container_of(work,
+                                        struct xfs_mount, m_flush_work);
+
+        xfs_sync_data(mp, SYNC_TRYLOCK);
+        xfs_sync_data(mp, SYNC_TRYLOCK | SYNC_WAIT);
+}
+
+int
+xfs_syncd_init(
+        struct xfs_mount        *mp)
+{
+        INIT_WORK(&mp->m_flush_work, xfs_flush_worker);
+        INIT_DELAYED_WORK(&mp->m_sync_work, xfs_sync_worker);
+        INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
+
+        xfs_syncd_queue_sync(mp);
+        xfs_syncd_queue_reclaim(mp);
+
+        return 0;
+}
+
+void
+xfs_syncd_stop(
+        struct xfs_mount        *mp)
+{
+        cancel_delayed_work_sync(&mp->m_sync_work);
+        cancel_delayed_work_sync(&mp->m_reclaim_work);
+        cancel_work_sync(&mp->m_flush_work);
+}
+
+void
+__xfs_inode_set_reclaim_tag(
+        struct xfs_perag        *pag,
+        struct xfs_inode        *ip)
+{
+        radix_tree_tag_set(&pag->pag_ici_root,
+                           XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),
+                           XFS_ICI_RECLAIM_TAG);
+
+        if (!pag->pag_ici_reclaimable) {
+                /* propagate the reclaim tag up into the perag radix tree */
+                spin_lock(&ip->i_mount->m_perag_lock);
+                radix_tree_tag_set(&ip->i_mount->m_perag_tree,
+                                XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
+                                XFS_ICI_RECLAIM_TAG);
+                spin_unlock(&ip->i_mount->m_perag_lock);
+
+                /* schedule periodic background inode reclaim */
+                xfs_syncd_queue_reclaim(ip->i_mount);
+
+                trace_xfs_perag_set_reclaim(ip->i_mount, pag->pag_agno,
+                                                        -1, _RET_IP_);
+        }
+        pag->pag_ici_reclaimable++;
+}
+
+/*
+ * We set the inode flag atomically with the radix tree tag.
+ * Once we get tag lookups on the radix tree, this inode flag
+ * can go away.
+ */
+void
+xfs_inode_set_reclaim_tag(
+        xfs_inode_t     *ip)
+{
+        struct xfs_mount *mp = ip->i_mount;
+        struct xfs_perag *pag;
+
+        pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
+        spin_lock(&pag->pag_ici_lock);
+        spin_lock(&ip->i_flags_lock);
+        __xfs_inode_set_reclaim_tag(pag, ip);
+        __xfs_iflags_set(ip, XFS_IRECLAIMABLE);
+        spin_unlock(&ip->i_flags_lock);
+        spin_unlock(&pag->pag_ici_lock);
+        xfs_perag_put(pag);
+}
+
+STATIC void
+__xfs_inode_clear_reclaim(
+        xfs_perag_t     *pag,
+        xfs_inode_t     *ip)
+{
+        pag->pag_ici_reclaimable--;
+        if (!pag->pag_ici_reclaimable) {
+                /* clear the reclaim tag from the perag radix tree */
+                spin_lock(&ip->i_mount->m_perag_lock);
+                radix_tree_tag_clear(&ip->i_mount->m_perag_tree,
+                                XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
+                                XFS_ICI_RECLAIM_TAG);
+                spin_unlock(&ip->i_mount->m_perag_lock);
+                trace_xfs_perag_clear_reclaim(ip->i_mount, pag->pag_agno,
+                                                        -1, _RET_IP_);
+        }
+}
+
+void
+__xfs_inode_clear_reclaim_tag(
+        xfs_mount_t     *mp,
+        xfs_perag_t     *pag,
+        xfs_inode_t     *ip)
+{
+        radix_tree_tag_clear(&pag->pag_ici_root,
+                        XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG);
+        __xfs_inode_clear_reclaim(pag, ip);
+}
+
+/*
+ * Grab the inode for reclaim exclusively.
+ * Return 0 if we grabbed it, non-zero otherwise.
+ */
+STATIC int
+xfs_reclaim_inode_grab(
+        struct xfs_inode        *ip,
+        int                     flags)
+{
+        ASSERT(rcu_read_lock_held());
+
+        /* quick check for stale RCU freed inode */
+        if (!ip->i_ino)
+                return 1;
+
+        /*
+         * do some unlocked checks first to avoid unnecessary lock traffic.
+         * The first is a flush lock check, the second is a already in reclaim
+         * check. Only do these checks if we are not going to block on locks.
+         */
+        if ((flags & SYNC_TRYLOCK) &&
+            (!ip->i_flush.done || __xfs_iflags_test(ip, XFS_IRECLAIM))) {
+                return 1;
+        }
+
+        /*
+         * The radix tree lock here protects a thread in xfs_iget from racing
+         * with us starting reclaim on the inode.  Once we have the
+         * XFS_IRECLAIM flag set it will not touch us.
+         *
+         * Due to RCU lookup, we may find inodes that have been freed and only
+         * have XFS_IRECLAIM set.  Indeed, we may see reallocated inodes that
+         * aren't candidates for reclaim at all, so we must check the
+         * XFS_IRECLAIMABLE is set first before proceeding to reclaim.
+         */
+        spin_lock(&ip->i_flags_lock);
+        if (!__xfs_iflags_test(ip, XFS_IRECLAIMABLE) ||
+            __xfs_iflags_test(ip, XFS_IRECLAIM)) {
+                /* not a reclaim candidate. */
+                spin_unlock(&ip->i_flags_lock);
+                return 1;
+        }
+        __xfs_iflags_set(ip, XFS_IRECLAIM);
+        spin_unlock(&ip->i_flags_lock);
+        return 0;
+}
+
+/*
+ * Inodes in different states need to be treated differently, and the return
+ * value of xfs_iflush is not sufficient to get this right. The following table
+ * lists the inode states and the reclaim actions necessary for non-blocking
+ * reclaim:
+ *
+ *
+ *      inode state          iflush ret         required action
+ *      ---------------      ----------         ---------------
+ *      bad                     -               reclaim
+ *      shutdown                EIO             unpin and reclaim
+ *      clean, unpinned         0               reclaim
+ *      stale, unpinned         0               reclaim
+ *      clean, pinned(*)        0               requeue
+ *      stale, pinned           EAGAIN          requeue
+ *      dirty, delwri ok        0               requeue
+ *      dirty, delwri blocked   EAGAIN          requeue
+ *      dirty, sync flush       0               reclaim
+ *
+ * (*) dgc: I don't think the clean, pinned state is possible but it gets
+ * handled anyway given the order of checks implemented.
+ *
+ * As can be seen from the table, the return value of xfs_iflush() is not
+ * sufficient to correctly decide the reclaim action here. The checks in
+ * xfs_iflush() might look like duplicates, but they are not.
+ *
+ * Also, because we get the flush lock first, we know that any inode that has
+ * been flushed delwri has had the flush completed by the time we check that
+ * the inode is clean. The clean inode check needs to be done before flushing
+ * the inode delwri otherwise we would loop forever requeuing clean inodes as
+ * we cannot tell apart a successful delwri flush and a clean inode from the
+ * return value of xfs_iflush().
+ *
+ * Note that because the inode is flushed delayed write by background
+ * writeback, the flush lock may already be held here and waiting on it can
+ * result in very long latencies. Hence for sync reclaims, where we wait on the
+ * flush lock, the caller should push out delayed write inodes first before
+ * trying to reclaim them to minimise the amount of time spent waiting. For
+ * background relaim, we just requeue the inode for the next pass.
+ *
+ * Hence the order of actions after gaining the locks should be:
+ *      bad             => reclaim
+ *      shutdown        => unpin and reclaim
+ *      pinned, delwri  => requeue
+ *      pinned, sync    => unpin
+ *      stale           => reclaim
+ *      clean           => reclaim
+ *      dirty, delwri   => flush and requeue
+ *      dirty, sync     => flush, wait and reclaim
+ */
+STATIC int
+xfs_reclaim_inode(
+        struct xfs_inode        *ip,
+        struct xfs_perag        *pag,
+        int                     sync_mode)
+{
+        int     error;
+
+restart:
+        error = 0;
+        xfs_ilock(ip, XFS_ILOCK_EXCL);
+        if (!xfs_iflock_nowait(ip)) {
+                if (!(sync_mode & SYNC_WAIT))
+                        goto out;
+                xfs_iflock(ip);
+        }
+
+        if (is_bad_inode(VFS_I(ip)))
+                goto reclaim;
+        if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
+                xfs_iunpin_wait(ip);
+                goto reclaim;
+        }
+        if (xfs_ipincount(ip)) {
+                if (!(sync_mode & SYNC_WAIT)) {
+                        xfs_ifunlock(ip);
+                        goto out;
+                }
+                xfs_iunpin_wait(ip);
+        }
+        if (xfs_iflags_test(ip, XFS_ISTALE))
+                goto reclaim;
+        if (xfs_inode_clean(ip))
+                goto reclaim;
+
+        /*
+         * Now we have an inode that needs flushing.
+         *
+         * We do a nonblocking flush here even if we are doing a SYNC_WAIT
+         * reclaim as we can deadlock with inode cluster removal.
+         * xfs_ifree_cluster() can lock the inode buffer before it locks the
+         * ip->i_lock, and we are doing the exact opposite here. As a result,
+         * doing a blocking xfs_itobp() to get the cluster buffer will result
+         * in an ABBA deadlock with xfs_ifree_cluster().
+         *
+         * As xfs_ifree_cluser() must gather all inodes that are active in the
+         * cache to mark them stale, if we hit this case we don't actually want
+         * to do IO here - we want the inode marked stale so we can simply
+         * reclaim it. Hence if we get an EAGAIN error on a SYNC_WAIT flush,
+         * just unlock the inode, back off and try again. Hopefully the next
+         * pass through will see the stale flag set on the inode.
+         */
+        error = xfs_iflush(ip, SYNC_TRYLOCK | sync_mode);
+        if (sync_mode & SYNC_WAIT) {
+                if (error == EAGAIN) {
+                        xfs_iunlock(ip, XFS_ILOCK_EXCL);
+                        /* backoff longer than in xfs_ifree_cluster */
+                        delay(2);
+                        goto restart;
+                }
+                xfs_iflock(ip);
+                goto reclaim;
+        }
+
+        /*
+         * When we have to flush an inode but don't have SYNC_WAIT set, we
+         * flush the inode out using a delwri buffer and wait for the next
+         * call into reclaim to find it in a clean state instead of waiting for
+         * it now. We also don't return errors here - if the error is transient
+         * then the next reclaim pass will flush the inode, and if the error
+         * is permanent then the next sync reclaim will reclaim the inode and
+         * pass on the error.
+         */
+        if (error && error != EAGAIN && !XFS_FORCED_SHUTDOWN(ip->i_mount)) {
+                xfs_warn(ip->i_mount,
+                        "inode 0x%llx background reclaim flush failed with %d",
+                        (long long)ip->i_ino, error);
+        }
+out:
+        xfs_iflags_clear(ip, XFS_IRECLAIM);
+        xfs_iunlock(ip, XFS_ILOCK_EXCL);
+        /*
+         * We could return EAGAIN here to make reclaim rescan the inode tree in
+         * a short while. However, this just burns CPU time scanning the tree
+         * waiting for IO to complete and xfssyncd never goes back to the idle
+         * state. Instead, return 0 to let the next scheduled background reclaim
+         * attempt to reclaim the inode again.
+         */
+        return 0;
+
+reclaim:
+        xfs_ifunlock(ip);
+        xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+        XFS_STATS_INC(xs_ig_reclaims);
+        /*
+         * Remove the inode from the per-AG radix tree.
+         *
+         * Because radix_tree_delete won't complain even if the item was never
+         * added to the tree assert that it's been there before to catch
+         * problems with the inode life time early on.
+         */
+        spin_lock(&pag->pag_ici_lock);
+        if (!radix_tree_delete(&pag->pag_ici_root,
+                                XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino)))
+                ASSERT(0);
+        __xfs_inode_clear_reclaim(pag, ip);
+        spin_unlock(&pag->pag_ici_lock);
+
+        /*
+         * Here we do an (almost) spurious inode lock in order to coordinate
+         * with inode cache radix tree lookups.  This is because the lookup
+         * can reference the inodes in the cache without taking references.
+         *
+         * We make that OK here by ensuring that we wait until the inode is
+         * unlocked after the lookup before we go ahead and free it.  We get
+         * both the ilock and the iolock because the code may need to drop the
+         * ilock one but will still hold the iolock.
+         */
+        xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+        xfs_qm_dqdetach(ip);
+        xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+
+        xfs_inode_free(ip);
+        return error;
+
+}
+
+/*
+ * Walk the AGs and reclaim the inodes in them. Even if the filesystem is
+ * corrupted, we still want to try to reclaim all the inodes. If we don't,
+ * then a shut down during filesystem unmount reclaim walk leak all the
+ * unreclaimed inodes.
+ */
+int
+xfs_reclaim_inodes_ag(
+        struct xfs_mount        *mp,
+        int                     flags,
+        int                     *nr_to_scan)
+{
+        struct xfs_perag        *pag;
+        int                     error = 0;
+        int                     last_error = 0;
+        xfs_agnumber_t          ag;
+        int                     trylock = flags & SYNC_TRYLOCK;
+        int                     skipped;
+
+restart:
+        ag = 0;
+        skipped = 0;
+        while ((pag = xfs_perag_get_tag(mp, ag, XFS_ICI_RECLAIM_TAG))) {
+                unsigned long   first_index = 0;
+                int             done = 0;
+                int             nr_found = 0;
+
+                ag = pag->pag_agno + 1;
+
+                if (trylock) {
+                        if (!mutex_trylock(&pag->pag_ici_reclaim_lock)) {
+                                skipped++;
+                                xfs_perag_put(pag);
+                                continue;
+                        }
+                        first_index = pag->pag_ici_reclaim_cursor;
+                } else
+                        mutex_lock(&pag->pag_ici_reclaim_lock);
+
+                do {
+                        struct xfs_inode *batch[XFS_LOOKUP_BATCH];
+                        int     i;
+
+                        rcu_read_lock();
+                        nr_found = radix_tree_gang_lookup_tag(
+                                        &pag->pag_ici_root,
+                                        (void **)batch, first_index,
+                                        XFS_LOOKUP_BATCH,
+                                        XFS_ICI_RECLAIM_TAG);
+                        if (!nr_found) {
+                                done = 1;
+                                rcu_read_unlock();
+                                break;
+                        }
+
+                        /*
+                         * Grab the inodes before we drop the lock. if we found
+                         * nothing, nr == 0 and the loop will be skipped.
+                         */
+                        for (i = 0; i < nr_found; i++) {
+                                struct xfs_inode *ip = batch[i];
+
+                                if (done || xfs_reclaim_inode_grab(ip, flags))
+                                        batch[i] = NULL;
+
+                                /*
+                                 * Update the index for the next lookup. Catch
+                                 * overflows into the next AG range which can
+                                 * occur if we have inodes in the last block of
+                                 * the AG and we are currently pointing to the
+                                 * last inode.
+                                 *
+                                 * Because we may see inodes that are from the
+                                 * wrong AG due to RCU freeing and
+                                 * reallocation, only update the index if it
+                                 * lies in this AG. It was a race that lead us
+                                 * to see this inode, so another lookup from
+                                 * the same index will not find it again.
+                                 */
+                                if (XFS_INO_TO_AGNO(mp, ip->i_ino) !=
+                                                                pag->pag_agno)
+                                        continue;
+                                first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);
+                                if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino))
+                                        done = 1;
+                        }
+
+                        /* unlock now we've grabbed the inodes. */
+                        rcu_read_unlock();
+
+                        for (i = 0; i < nr_found; i++) {
+                                if (!batch[i])
+                                        continue;
+                                error = xfs_reclaim_inode(batch[i], pag, flags);
+                                if (error && last_error != EFSCORRUPTED)
+                                        last_error = error;
+                        }
+
+                        *nr_to_scan -= XFS_LOOKUP_BATCH;
+
+                        cond_resched();
+
+                } while (nr_found && !done && *nr_to_scan > 0);
+
+                if (trylock && !done)
+                        pag->pag_ici_reclaim_cursor = first_index;
+                else
+                        pag->pag_ici_reclaim_cursor = 0;
+                mutex_unlock(&pag->pag_ici_reclaim_lock);
+                xfs_perag_put(pag);
+        }
+
+        /*
+         * if we skipped any AG, and we still have scan count remaining, do
+         * another pass this time using blocking reclaim semantics (i.e
+         * waiting on the reclaim locks and ignoring the reclaim cursors). This
+         * ensure that when we get more reclaimers than AGs we block rather
+         * than spin trying to execute reclaim.
+         */
+        if (skipped && (flags & SYNC_WAIT) && *nr_to_scan > 0) {
+                trylock = 0;
+                goto restart;
+        }
+        return XFS_ERROR(last_error);
+}
+
+int
+xfs_reclaim_inodes(
+        xfs_mount_t     *mp,
+        int             mode)
+{
+        int             nr_to_scan = INT_MAX;
+
+        return xfs_reclaim_inodes_ag(mp, mode, &nr_to_scan);
+}
+
+/*
+ * Scan a certain number of inodes for reclaim.
+ *
+ * When called we make sure that there is a background (fast) inode reclaim in
+ * progress, while we will throttle the speed of reclaim via doing synchronous
+ * reclaim of inodes. That means if we come across dirty inodes, we wait for
+ * them to be cleaned, which we hope will not be very long due to the
+ * background walker having already kicked the IO off on those dirty inodes.
+ */
+void
+xfs_reclaim_inodes_nr(
+        struct xfs_mount        *mp,
+        int                     nr_to_scan)
+{
+        /* kick background reclaimer and push the AIL */
+        xfs_syncd_queue_reclaim(mp);
+        xfs_ail_push_all(mp->m_ail);
+
+        xfs_reclaim_inodes_ag(mp, SYNC_TRYLOCK | SYNC_WAIT, &nr_to_scan);
+}
+
+/*
+ * Return the number of reclaimable inodes in the filesystem for
+ * the shrinker to determine how much to reclaim.
+ */
+int
+xfs_reclaim_inodes_count(
+        struct xfs_mount        *mp)
+{
+        struct xfs_perag        *pag;
+        xfs_agnumber_t          ag = 0;
+        int                     reclaimable = 0;
+
+        while ((pag = xfs_perag_get_tag(mp, ag, XFS_ICI_RECLAIM_TAG))) {
+                ag = pag->pag_agno + 1;
+                reclaimable += pag->pag_ici_reclaimable;
+                xfs_perag_put(pag);
+        }
+        return reclaimable;
+}
+
diff --git a/fs/xfs/xfs_sync.h b/fs/xfs/xfs_sync.h
new file mode 100644
index 00000000000..941202e7ac6
--- /dev/null
+++ b/fs/xfs/xfs_sync.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef XFS_SYNC_H
+#define XFS_SYNC_H 1
+
+struct xfs_mount;
+struct xfs_perag;
+
+#define SYNC_WAIT               0x0001  /* wait for i/o to complete */
+#define SYNC_TRYLOCK            0x0002  /* only try to lock inodes */
+
+extern struct workqueue_struct  *xfs_syncd_wq;  /* sync workqueue */
+
+int xfs_syncd_init(struct xfs_mount *mp);
+void xfs_syncd_stop(struct xfs_mount *mp);
+
+int xfs_quiesce_data(struct xfs_mount *mp);
+void xfs_quiesce_attr(struct xfs_mount *mp);
+
+void xfs_flush_inodes(struct xfs_inode *ip);
+
+int xfs_reclaim_inodes(struct xfs_mount *mp, int mode);
+int xfs_reclaim_inodes_count(struct xfs_mount *mp);
+void xfs_reclaim_inodes_nr(struct xfs_mount *mp, int nr_to_scan);
+
+void xfs_inode_set_reclaim_tag(struct xfs_inode *ip);
+void __xfs_inode_set_reclaim_tag(struct xfs_perag *pag, struct xfs_inode *ip);
+void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp, struct xfs_perag *pag,
+                                struct xfs_inode *ip);
+
+int xfs_sync_inode_grab(struct xfs_inode *ip);
+int xfs_inode_ag_iterator(struct xfs_mount *mp,
+        int (*execute)(struct xfs_inode *ip, struct xfs_perag *pag, int flags),
+        int flags);
+
+#endif
diff --git a/fs/yaffs2/Kconfig b/fs/yaffs2/Kconfig
new file mode 100644
index 00000000000..63541405999
--- /dev/null
+++ b/fs/yaffs2/Kconfig
@@ -0,0 +1,161 @@
+#
+# YAFFS file system configurations
+#
+
+config YAFFS_FS
+        tristate "YAFFS2 file system support"
+        default n
+        depends on MTD_BLOCK
+        select YAFFS_YAFFS1
+        select YAFFS_YAFFS2
+        help
+          YAFFS2, or Yet Another Flash Filing System, is a filing system
+          optimised for NAND Flash chips.
+
+          To compile the YAFFS2 file system support as a module, choose M
+          here: the module will be called yaffs2.
+
+          If unsure, say N.
+
+          Further information on YAFFS2 is available at
+          <http://www.aleph1.co.uk/yaffs/>.
+
+config YAFFS_YAFFS1
+        bool "512 byte / page devices"
+        depends on YAFFS_FS
+        default y
+        help
+          Enable YAFFS1 support -- yaffs for 512 byte / page devices
+
+          Not needed for 2K-page devices.
+
+          If unsure, say Y.
+
+config YAFFS_9BYTE_TAGS
+        bool "Use older-style on-NAND data format with pageStatus byte"
+        depends on YAFFS_YAFFS1
+        default n
+        help
+
+          Older-style on-NAND data format has a "pageStatus" byte to record
+          chunk/page state.  This byte is zero when the page is discarded.
+          Choose this option if you have existing on-NAND data using this
+          format that you need to continue to support.  New data written
+          also uses the older-style format.  Note: Use of this option
+          generally requires that MTD's oob layout be adjusted to use the
+          older-style format.  See notes on tags formats and MTD versions
+          in yaffs_mtdif1.c.
+
+          If unsure, say N.
+
+config YAFFS_DOES_ECC
+        bool "Lets Yaffs do its own ECC"
+        depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
+        default n
+        help
+          This enables Yaffs to use its own ECC functions instead of using
+          the ones from the generic MTD-NAND driver.
+
+          If unsure, say N.
+
+config YAFFS_ECC_WRONG_ORDER
+        bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
+        depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
+        default n
+        help
+          This makes yaffs_ecc.c use the same ecc byte order as Steven
+          Hill's nand_ecc.c. If not set, then you get the same ecc byte
+          order as SmartMedia.
+
+          If unsure, say N.
+
+config YAFFS_YAFFS2
+        bool "2048 byte (or larger) / page devices"
+        depends on YAFFS_FS
+        default y
+        help
+          Enable YAFFS2 support -- yaffs for >= 2K bytes per page devices
+
+          If unsure, say Y.
+
+config YAFFS_AUTO_YAFFS2
+        bool "Autoselect yaffs2 format"
+        depends on YAFFS_YAFFS2
+        default y
+        help
+          Without this, you need to explicitely use yaffs2 as the file
+          system type. With this, you can say "yaffs" and yaffs or yaffs2
+          will be used depending on the device page size (yaffs on
+          512-byte page devices, yaffs2 on 2K page devices).
+
+          If unsure, say Y.
+
+config YAFFS_DISABLE_TAGS_ECC
+        bool "Disable YAFFS from doing ECC on tags by default"
+        depends on YAFFS_FS && YAFFS_YAFFS2
+        default n
+        help
+          This defaults Yaffs to using its own ECC calculations on tags instead of
+          just relying on the MTD.
+          This behavior can also be overridden with tags_ecc_on and
+          tags_ecc_off mount options.
+
+          If unsure, say N.
+
+config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+        bool "Force chunk erase check"
+        depends on YAFFS_FS
+        default n
+        help
+          Normally YAFFS only checks chunks before writing until an erased
+          chunk is found. This helps to detect any partially written
+          chunks that might have happened due to power loss.
+
+          Enabling this forces on the test that chunks are erased in flash
+          before writing to them. This takes more time but is potentially
+          a bit more secure.
+
+          Suggest setting Y during development and ironing out driver
+          issues etc. Suggest setting to N if you want faster writing.
+
+          If unsure, say Y.
+
+config YAFFS_EMPTY_LOST_AND_FOUND
+        bool "Empty lost and found on boot"
+        depends on YAFFS_FS
+        default n
+        help
+          If this is enabled then the contents of lost and found is
+          automatically dumped at mount.
+
+          If unsure, say N.
+
+config YAFFS_DISABLE_BLOCK_REFRESHING
+        bool "Disable yaffs2 block refreshing"
+        depends on YAFFS_FS
+        default n
+        help
+         If this is set, then block refreshing is disabled.
+         Block refreshing infrequently refreshes the oldest block in
+         a yaffs2 file system. This mechanism helps to refresh flash to
+         mitigate against data loss. This is particularly useful for MLC.
+
+          If unsure, say N.
+
+config YAFFS_DISABLE_BACKGROUND
+        bool "Disable yaffs2 background processing"
+        depends on YAFFS_FS
+        default n
+        help
+         If this is set, then background processing is disabled.
+         Background processing makes many foreground activities faster.
+
+         If unsure, say N.
+
+config YAFFS_XATTR
+        bool "Enable yaffs2 xattr support"
+        depends on YAFFS_FS
+        default y
+        help
+         If this is set then yaffs2 will provide xattr support.
+         If unsure, say Y.
diff --git a/fs/yaffs2/Makefile b/fs/yaffs2/Makefile
new file mode 100644
index 00000000000..e63a28aa3ed
--- /dev/null
+++ b/fs/yaffs2/Makefile
@@ -0,0 +1,17 @@
+#
+# Makefile for the linux YAFFS filesystem routines.
+#
+
+obj-$(CONFIG_YAFFS_FS) += yaffs.o
+
+yaffs-y := yaffs_ecc.o yaffs_vfs.o yaffs_guts.o yaffs_checkptrw.o
+yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o
+yaffs-y += yaffs_tagscompat.o yaffs_tagsvalidity.o
+yaffs-y += yaffs_mtdif.o yaffs_mtdif1.o yaffs_mtdif2.o
+yaffs-y += yaffs_nameval.o yaffs_attribs.o
+yaffs-y += yaffs_allocator.o
+yaffs-y += yaffs_yaffs1.o
+yaffs-y += yaffs_yaffs2.o
+yaffs-y += yaffs_bitmap.o
+yaffs-y += yaffs_verify.o
+
diff --git a/fs/yaffs2/yaffs_allocator.c b/fs/yaffs2/yaffs_allocator.c
new file mode 100644
index 00000000000..f9cd5becd8f
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.c
@@ -0,0 +1,396 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+
+#ifdef CONFIG_YAFFS_KMALLOC_ALLOCATOR
+
+void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+        dev = dev;
+}
+
+void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+        dev = dev;
+}
+
+struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
+{
+        return (struct yaffs_tnode *)kmalloc(dev->tnode_size, GFP_NOFS);
+}
+
+void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+        dev = dev;
+        kfree(tn);
+}
+
+void yaffs_init_raw_objs(struct yaffs_dev *dev)
+{
+        dev = dev;
+}
+
+void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
+{
+        dev = dev;
+}
+
+struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
+{
+        dev = dev;
+        return (struct yaffs_obj *)kmalloc(sizeof(struct yaffs_obj));
+}
+
+void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+
+        dev = dev;
+        kfree(obj);
+}
+
+#else
+
+struct yaffs_tnode_list {
+        struct yaffs_tnode_list *next;
+        struct yaffs_tnode *tnodes;
+};
+
+struct yaffs_obj_list {
+        struct yaffs_obj_list *next;
+        struct yaffs_obj *objects;
+};
+
+struct yaffs_allocator {
+        int n_tnodes_created;
+        struct yaffs_tnode *free_tnodes;
+        int n_free_tnodes;
+        struct yaffs_tnode_list *alloc_tnode_list;
+
+        int n_obj_created;
+        struct yaffs_obj *free_objs;
+        int n_free_objects;
+
+        struct yaffs_obj_list *allocated_obj_list;
+};
+
+static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
+{
+
+        struct yaffs_allocator *allocator =
+            (struct yaffs_allocator *)dev->allocator;
+
+        struct yaffs_tnode_list *tmp;
+
+        if (!allocator) {
+                YBUG();
+                return;
+        }
+
+        while (allocator->alloc_tnode_list) {
+                tmp = allocator->alloc_tnode_list->next;
+
+                kfree(allocator->alloc_tnode_list->tnodes);
+                kfree(allocator->alloc_tnode_list);
+                allocator->alloc_tnode_list = tmp;
+
+        }
+
+        allocator->free_tnodes = NULL;
+        allocator->n_free_tnodes = 0;
+        allocator->n_tnodes_created = 0;
+}
+
+static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
+{
+        struct yaffs_allocator *allocator = dev->allocator;
+
+        if (allocator) {
+                allocator->alloc_tnode_list = NULL;
+                allocator->free_tnodes = NULL;
+                allocator->n_free_tnodes = 0;
+                allocator->n_tnodes_created = 0;
+        } else {
+                YBUG();
+        }
+}
+
+static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
+{
+        struct yaffs_allocator *allocator =
+            (struct yaffs_allocator *)dev->allocator;
+        int i;
+        struct yaffs_tnode *new_tnodes;
+        u8 *mem;
+        struct yaffs_tnode *curr;
+        struct yaffs_tnode *next;
+        struct yaffs_tnode_list *tnl;
+
+        if (!allocator) {
+                YBUG();
+                return YAFFS_FAIL;
+        }
+
+        if (n_tnodes < 1)
+                return YAFFS_OK;
+
+        /* make these things */
+
+        new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS);
+        mem = (u8 *) new_tnodes;
+
+        if (!new_tnodes) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "yaffs: Could not allocate Tnodes");
+                return YAFFS_FAIL;
+        }
+
+        /* New hookup for wide tnodes */
+        for (i = 0; i < n_tnodes - 1; i++) {
+                curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
+                next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
+                curr->internal[0] = next;
+        }
+
+        curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
+        curr->internal[0] = allocator->free_tnodes;
+        allocator->free_tnodes = (struct yaffs_tnode *)mem;
+
+        allocator->n_free_tnodes += n_tnodes;
+        allocator->n_tnodes_created += n_tnodes;
+
+        /* Now add this bunch of tnodes to a list for freeing up.
+         * NB If we can't add this to the management list it isn't fatal
+         * but it just means we can't free this bunch of tnodes later.
+         */
+
+        tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS);
+        if (!tnl) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "Could not add tnodes to management list");
+                return YAFFS_FAIL;
+        } else {
+                tnl->tnodes = new_tnodes;
+                tnl->next = allocator->alloc_tnode_list;
+                allocator->alloc_tnode_list = tnl;
+        }
+
+        yaffs_trace(YAFFS_TRACE_ALLOCATE,"Tnodes added");
+
+        return YAFFS_OK;
+}
+
+struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
+{
+        struct yaffs_allocator *allocator =
+            (struct yaffs_allocator *)dev->allocator;
+        struct yaffs_tnode *tn = NULL;
+
+        if (!allocator) {
+                YBUG();
+                return NULL;
+        }
+
+        /* If there are none left make more */
+        if (!allocator->free_tnodes)
+                yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
+
+        if (allocator->free_tnodes) {
+                tn = allocator->free_tnodes;
+                allocator->free_tnodes = allocator->free_tnodes->internal[0];
+                allocator->n_free_tnodes--;
+        }
+
+        return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+        struct yaffs_allocator *allocator = dev->allocator;
+
+        if (!allocator) {
+                YBUG();
+                return;
+        }
+
+        if (tn) {
+                tn->internal[0] = allocator->free_tnodes;
+                allocator->free_tnodes = tn;
+                allocator->n_free_tnodes++;
+        }
+        dev->checkpoint_blocks_required = 0;    /* force recalculation */
+}
+
+static void yaffs_init_raw_objs(struct yaffs_dev *dev)
+{
+        struct yaffs_allocator *allocator = dev->allocator;
+
+        if (allocator) {
+                allocator->allocated_obj_list = NULL;
+                allocator->free_objs = NULL;
+                allocator->n_free_objects = 0;
+        } else {
+                YBUG();
+        }
+}
+
+static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
+{
+        struct yaffs_allocator *allocator = dev->allocator;
+        struct yaffs_obj_list *tmp;
+
+        if (!allocator) {
+                YBUG();
+                return;
+        }
+
+        while (allocator->allocated_obj_list) {
+                tmp = allocator->allocated_obj_list->next;
+                kfree(allocator->allocated_obj_list->objects);
+                kfree(allocator->allocated_obj_list);
+
+                allocator->allocated_obj_list = tmp;
+        }
+
+        allocator->free_objs = NULL;
+        allocator->n_free_objects = 0;
+        allocator->n_obj_created = 0;
+}
+
+static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
+{
+        struct yaffs_allocator *allocator = dev->allocator;
+
+        int i;
+        struct yaffs_obj *new_objs;
+        struct yaffs_obj_list *list;
+
+        if (!allocator) {
+                YBUG();
+                return YAFFS_FAIL;
+        }
+
+        if (n_obj < 1)
+                return YAFFS_OK;
+
+        /* make these things */
+        new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS);
+        list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS);
+
+        if (!new_objs || !list) {
+                if (new_objs) {
+                        kfree(new_objs);
+                        new_objs = NULL;
+                }
+                if (list) {
+                        kfree(list);
+                        list = NULL;
+                }
+                yaffs_trace(YAFFS_TRACE_ALLOCATE,
+                        "Could not allocate more objects");
+                return YAFFS_FAIL;
+        }
+
+        /* Hook them into the free list */
+        for (i = 0; i < n_obj - 1; i++) {
+                new_objs[i].siblings.next =
+                    (struct list_head *)(&new_objs[i + 1]);
+        }
+
+        new_objs[n_obj - 1].siblings.next = (void *)allocator->free_objs;
+        allocator->free_objs = new_objs;
+        allocator->n_free_objects += n_obj;
+        allocator->n_obj_created += n_obj;
+
+        /* Now add this bunch of Objects to a list for freeing up. */
+
+        list->objects = new_objs;
+        list->next = allocator->allocated_obj_list;
+        allocator->allocated_obj_list = list;
+
+        return YAFFS_OK;
+}
+
+struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
+{
+        struct yaffs_obj *obj = NULL;
+        struct yaffs_allocator *allocator = dev->allocator;
+
+        if (!allocator) {
+                YBUG();
+                return obj;
+        }
+
+        /* If there are none left make more */
+        if (!allocator->free_objs)
+                yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
+
+        if (allocator->free_objs) {
+                obj = allocator->free_objs;
+                allocator->free_objs =
+                    (struct yaffs_obj *)(allocator->free_objs->siblings.next);
+                allocator->n_free_objects--;
+        }
+
+        return obj;
+}
+
+void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+
+        struct yaffs_allocator *allocator = dev->allocator;
+
+        if (!allocator)
+                YBUG();
+        else {
+                /* Link into the free list. */
+                obj->siblings.next = (struct list_head *)(allocator->free_objs);
+                allocator->free_objs = obj;
+                allocator->n_free_objects++;
+        }
+}
+
+void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+        if (dev->allocator) {
+                yaffs_deinit_raw_tnodes(dev);
+                yaffs_deinit_raw_objs(dev);
+
+                kfree(dev->allocator);
+                dev->allocator = NULL;
+        } else {
+                YBUG();
+        }
+}
+
+void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+        struct yaffs_allocator *allocator;
+
+        if (!dev->allocator) {
+                allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS);
+                if (allocator) {
+                        dev->allocator = allocator;
+                        yaffs_init_raw_tnodes(dev);
+                        yaffs_init_raw_objs(dev);
+                }
+        } else {
+                YBUG();
+        }
+}
+
+#endif
diff --git a/fs/yaffs2/yaffs_allocator.h b/fs/yaffs2/yaffs_allocator.h
new file mode 100644
index 00000000000..4d5f2aec89f
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.h
@@ -0,0 +1,30 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ALLOCATOR_H__
+#define __YAFFS_ALLOCATOR_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev);
+void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev);
+
+struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev);
+void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn);
+
+struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev);
+void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj);
+
+#endif
diff --git a/fs/yaffs2/yaffs_attribs.c b/fs/yaffs2/yaffs_attribs.c
new file mode 100644
index 00000000000..9b47d376310
--- /dev/null
+++ b/fs/yaffs2/yaffs_attribs.c
@@ -0,0 +1,124 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_attribs.h"
+
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
+{
+        obj->yst_uid = oh->yst_uid;
+        obj->yst_gid = oh->yst_gid;
+        obj->yst_atime = oh->yst_atime;
+        obj->yst_mtime = oh->yst_mtime;
+        obj->yst_ctime = oh->yst_ctime;
+        obj->yst_rdev = oh->yst_rdev;
+}
+
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
+{
+        oh->yst_uid = obj->yst_uid;
+        oh->yst_gid = obj->yst_gid;
+        oh->yst_atime = obj->yst_atime;
+        oh->yst_mtime = obj->yst_mtime;
+        oh->yst_ctime = obj->yst_ctime;
+        oh->yst_rdev = obj->yst_rdev;
+
+}
+
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
+{
+        obj->yst_mtime = Y_CURRENT_TIME;
+        if (do_a)
+                obj->yst_atime = obj->yst_mtime;
+        if (do_c)
+                obj->yst_ctime = obj->yst_mtime;
+}
+
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
+{
+        yaffs_load_current_time(obj, 1, 1);
+        obj->yst_rdev = rdev;
+        obj->yst_uid = uid;
+        obj->yst_gid = gid;
+}
+
+loff_t yaffs_get_file_size(struct yaffs_obj *obj)
+{
+        YCHAR *alias = NULL;
+        obj = yaffs_get_equivalent_obj(obj);
+
+        switch (obj->variant_type) {
+        case YAFFS_OBJECT_TYPE_FILE:
+                return obj->variant.file_variant.file_size;
+        case YAFFS_OBJECT_TYPE_SYMLINK:
+                alias = obj->variant.symlink_variant.alias;
+                if (!alias)
+                        return 0;
+                return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
+        default:
+                return 0;
+        }
+}
+
+int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
+{
+        unsigned int valid = attr->ia_valid;
+
+        if (valid & ATTR_MODE)
+                obj->yst_mode = attr->ia_mode;
+        if (valid & ATTR_UID)
+                obj->yst_uid = attr->ia_uid;
+        if (valid & ATTR_GID)
+                obj->yst_gid = attr->ia_gid;
+
+        if (valid & ATTR_ATIME)
+                obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
+        if (valid & ATTR_CTIME)
+                obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
+        if (valid & ATTR_MTIME)
+                obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
+
+        if (valid & ATTR_SIZE)
+                yaffs_resize_file(obj, attr->ia_size);
+
+        yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+        return YAFFS_OK;
+
+}
+
+int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
+{
+        unsigned int valid = 0;
+
+        attr->ia_mode = obj->yst_mode;
+        valid |= ATTR_MODE;
+        attr->ia_uid = obj->yst_uid;
+        valid |= ATTR_UID;
+        attr->ia_gid = obj->yst_gid;
+        valid |= ATTR_GID;
+
+        Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
+        valid |= ATTR_ATIME;
+        Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
+        valid |= ATTR_CTIME;
+        Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
+        valid |= ATTR_MTIME;
+
+        attr->ia_size = yaffs_get_file_size(obj);
+        valid |= ATTR_SIZE;
+
+        attr->ia_valid = valid;
+
+        return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_attribs.h b/fs/yaffs2/yaffs_attribs.h
new file mode 100644
index 00000000000..33d541d6944
--- /dev/null
+++ b/fs/yaffs2/yaffs_attribs.h
@@ -0,0 +1,28 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ATTRIBS_H__
+#define __YAFFS_ATTRIBS_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh);
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj);
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev);
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c);
+int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr);
+int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr);
+
+#endif
diff --git a/fs/yaffs2/yaffs_bitmap.c b/fs/yaffs2/yaffs_bitmap.c
new file mode 100644
index 00000000000..7df42cd0066
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.c
@@ -0,0 +1,98 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_bitmap.h"
+#include "yaffs_trace.h"
+/*
+ * Chunk bitmap manipulations
+ */
+
+static inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk)
+{
+        if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "BlockBits block %d is not valid",
+                        blk);
+                YBUG();
+        }
+        return dev->chunk_bits +
+            (dev->chunk_bit_stride * (blk - dev->internal_start_block));
+}
+
+void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk)
+{
+        if (blk < dev->internal_start_block || blk > dev->internal_end_block ||
+            chunk < 0 || chunk >= dev->param.chunks_per_block) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "Chunk Id (%d:%d) invalid",
+                        blk, chunk);
+                YBUG();
+        }
+}
+
+void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk)
+{
+        u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+        memset(blk_bits, 0, dev->chunk_bit_stride);
+}
+
+void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+        u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+        yaffs_verify_chunk_bit_id(dev, blk, chunk);
+
+        blk_bits[chunk / 8] &= ~(1 << (chunk & 7));
+}
+
+void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+        u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+        yaffs_verify_chunk_bit_id(dev, blk, chunk);
+
+        blk_bits[chunk / 8] |= (1 << (chunk & 7));
+}
+
+int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+        u8 *blk_bits = yaffs_block_bits(dev, blk);
+        yaffs_verify_chunk_bit_id(dev, blk, chunk);
+
+        return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+}
+
+int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk)
+{
+        u8 *blk_bits = yaffs_block_bits(dev, blk);
+        int i;
+        for (i = 0; i < dev->chunk_bit_stride; i++) {
+                if (*blk_bits)
+                        return 1;
+                blk_bits++;
+        }
+        return 0;
+}
+
+int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk)
+{
+        u8 *blk_bits = yaffs_block_bits(dev, blk);
+        int i;
+        int n = 0;
+
+        for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++)
+                n += hweight8(*blk_bits);
+
+        return n;
+}
diff --git a/fs/yaffs2/yaffs_bitmap.h b/fs/yaffs2/yaffs_bitmap.h
new file mode 100644
index 00000000000..cf9ea58da0d
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.h
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+#ifndef __YAFFS_BITMAP_H__
+#define __YAFFS_BITMAP_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk);
+void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk);
+void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk);
+int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk);
+
+#endif
diff --git a/fs/yaffs2/yaffs_checkptrw.c b/fs/yaffs2/yaffs_checkptrw.c
new file mode 100644
index 00000000000..4e40f437e65
--- /dev/null
+++ b/fs/yaffs2/yaffs_checkptrw.c
@@ -0,0 +1,415 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_checkptrw.h"
+#include "yaffs_getblockinfo.h"
+
+static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)
+{
+        int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "checkpt blocks_avail = %d", blocks_avail);
+
+        return (blocks_avail <= 0) ? 0 : 1;
+}
+
+static int yaffs_checkpt_erase(struct yaffs_dev *dev)
+{
+        int i;
+
+        if (!dev->param.erase_fn)
+                return 0;
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "checking blocks %d to %d",
+                dev->internal_start_block, dev->internal_end_block);
+
+        for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+                struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
+                if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+                        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "erasing checkpt block %d", i);
+
+                        dev->n_erasures++;
+
+                        if (dev->param.
+                            erase_fn(dev,
+                                     i - dev->block_offset /* realign */ )) {
+                                bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+                                dev->n_erased_blocks++;
+                                dev->n_free_chunks +=
+                                    dev->param.chunks_per_block;
+                        } else {
+                                dev->param.bad_block_fn(dev, i);
+                                bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+                        }
+                }
+        }
+
+        dev->blocks_in_checkpt = 0;
+
+        return 1;
+}
+
+static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)
+{
+        int i;
+        int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "allocating checkpt block: erased %d reserved %d avail %d next %d ",
+                dev->n_erased_blocks, dev->param.n_reserved_blocks,
+                blocks_avail, dev->checkpt_next_block);
+
+        if (dev->checkpt_next_block >= 0 &&
+            dev->checkpt_next_block <= dev->internal_end_block &&
+            blocks_avail > 0) {
+
+                for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+                     i++) {
+                        struct yaffs_block_info *bi =
+                            yaffs_get_block_info(dev, i);
+                        if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+                                dev->checkpt_next_block = i + 1;
+                                dev->checkpt_cur_block = i;
+                                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                                        "allocating checkpt block %d", i);
+                                return;
+                        }
+                }
+        }
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks");
+
+        dev->checkpt_next_block = -1;
+        dev->checkpt_cur_block = -1;
+}
+
+static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
+{
+        int i;
+        struct yaffs_ext_tags tags;
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "find next checkpt block: start:  blocks %d next %d",
+                dev->blocks_in_checkpt, dev->checkpt_next_block);
+
+        if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
+                for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+                     i++) {
+                        int chunk = i * dev->param.chunks_per_block;
+                        int realigned_chunk = chunk - dev->chunk_offset;
+
+                        dev->param.read_chunk_tags_fn(dev, realigned_chunk,
+                                                      NULL, &tags);
+                        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                                "find next checkpt block: search: block %d oid %d seq %d eccr %d",
+                                i, tags.obj_id, tags.seq_number,
+                                tags.ecc_result);
+
+                        if (tags.seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA) {
+                                /* Right kind of block */
+                                dev->checkpt_next_block = tags.obj_id;
+                                dev->checkpt_cur_block = i;
+                                dev->checkpt_block_list[dev->
+                                                        blocks_in_checkpt] = i;
+                                dev->blocks_in_checkpt++;
+                                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                                        "found checkpt block %d", i);
+                                return;
+                        }
+                }
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
+
+        dev->checkpt_next_block = -1;
+        dev->checkpt_cur_block = -1;
+}
+
+int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)
+{
+
+        dev->checkpt_open_write = writing;
+
+        /* Got the functions we need? */
+        if (!dev->param.write_chunk_tags_fn ||
+            !dev->param.read_chunk_tags_fn ||
+            !dev->param.erase_fn || !dev->param.bad_block_fn)
+                return 0;
+
+        if (writing && !yaffs2_checkpt_space_ok(dev))
+                return 0;
+
+        if (!dev->checkpt_buffer)
+                dev->checkpt_buffer =
+                    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+        if (!dev->checkpt_buffer)
+                return 0;
+
+        dev->checkpt_page_seq = 0;
+        dev->checkpt_byte_count = 0;
+        dev->checkpt_sum = 0;
+        dev->checkpt_xor = 0;
+        dev->checkpt_cur_block = -1;
+        dev->checkpt_cur_chunk = -1;
+        dev->checkpt_next_block = dev->internal_start_block;
+
+        /* Erase all the blocks in the checkpoint area */
+        if (writing) {
+                memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
+                dev->checkpt_byte_offs = 0;
+                return yaffs_checkpt_erase(dev);
+        } else {
+                int i;
+                /* Set to a value that will kick off a read */
+                dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
+                /* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
+                 * going to be way more than we need */
+                dev->blocks_in_checkpt = 0;
+                dev->checkpt_max_blocks =
+                    (dev->internal_end_block - dev->internal_start_block) / 16 +
+                    2;
+                dev->checkpt_block_list =
+                    kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS);
+                if (!dev->checkpt_block_list)
+                        return 0;
+
+                for (i = 0; i < dev->checkpt_max_blocks; i++)
+                        dev->checkpt_block_list[i] = -1;
+        }
+
+        return 1;
+}
+
+int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)
+{
+        u32 composite_sum;
+        composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xFF);
+        *sum = composite_sum;
+        return 1;
+}
+
+static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
+{
+        int chunk;
+        int realigned_chunk;
+
+        struct yaffs_ext_tags tags;
+
+        if (dev->checkpt_cur_block < 0) {
+                yaffs2_checkpt_find_erased_block(dev);
+                dev->checkpt_cur_chunk = 0;
+        }
+
+        if (dev->checkpt_cur_block < 0)
+                return 0;
+
+        tags.is_deleted = 0;
+        tags.obj_id = dev->checkpt_next_block;  /* Hint to next place to look */
+        tags.chunk_id = dev->checkpt_page_seq + 1;
+        tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA;
+        tags.n_bytes = dev->data_bytes_per_chunk;
+        if (dev->checkpt_cur_chunk == 0) {
+                /* First chunk we write for the block? Set block state to
+                   checkpoint */
+                struct yaffs_block_info *bi =
+                    yaffs_get_block_info(dev, dev->checkpt_cur_block);
+                bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+                dev->blocks_in_checkpt++;
+        }
+
+        chunk =
+            dev->checkpt_cur_block * dev->param.chunks_per_block +
+            dev->checkpt_cur_chunk;
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "checkpoint wite buffer nand %d(%d:%d) objid %d chId %d",
+                chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
+                tags.obj_id, tags.chunk_id);
+
+        realigned_chunk = chunk - dev->chunk_offset;
+
+        dev->n_page_writes++;
+
+        dev->param.write_chunk_tags_fn(dev, realigned_chunk,
+                                       dev->checkpt_buffer, &tags);
+        dev->checkpt_byte_offs = 0;
+        dev->checkpt_page_seq++;
+        dev->checkpt_cur_chunk++;
+        if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {
+                dev->checkpt_cur_chunk = 0;
+                dev->checkpt_cur_block = -1;
+        }
+        memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
+
+        return 1;
+}
+
+int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes)
+{
+        int i = 0;
+        int ok = 1;
+
+        u8 *data_bytes = (u8 *) data;
+
+        if (!dev->checkpt_buffer)
+                return 0;
+
+        if (!dev->checkpt_open_write)
+                return -1;
+
+        while (i < n_bytes && ok) {
+                dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes;
+                dev->checkpt_sum += *data_bytes;
+                dev->checkpt_xor ^= *data_bytes;
+
+                dev->checkpt_byte_offs++;
+                i++;
+                data_bytes++;
+                dev->checkpt_byte_count++;
+
+                if (dev->checkpt_byte_offs < 0 ||
+                    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk)
+                        ok = yaffs2_checkpt_flush_buffer(dev);
+        }
+
+        return i;
+}
+
+int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
+{
+        int i = 0;
+        int ok = 1;
+        struct yaffs_ext_tags tags;
+
+        int chunk;
+        int realigned_chunk;
+
+        u8 *data_bytes = (u8 *) data;
+
+        if (!dev->checkpt_buffer)
+                return 0;
+
+        if (dev->checkpt_open_write)
+                return -1;
+
+        while (i < n_bytes && ok) {
+
+                if (dev->checkpt_byte_offs < 0 ||
+                    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) {
+
+                        if (dev->checkpt_cur_block < 0) {
+                                yaffs2_checkpt_find_block(dev);
+                                dev->checkpt_cur_chunk = 0;
+                        }
+
+                        if (dev->checkpt_cur_block < 0)
+                                ok = 0;
+                        else {
+                                chunk = dev->checkpt_cur_block *
+                                    dev->param.chunks_per_block +
+                                    dev->checkpt_cur_chunk;
+
+                                realigned_chunk = chunk - dev->chunk_offset;
+
+                                dev->n_page_reads++;
+
+                                /* read in the next chunk */
+                                dev->param.read_chunk_tags_fn(dev,
+                                                              realigned_chunk,
+                                                              dev->
+                                                              checkpt_buffer,
+                                                              &tags);
+
+                                if (tags.chunk_id != (dev->checkpt_page_seq + 1)
+                                    || tags.ecc_result > YAFFS_ECC_RESULT_FIXED
+                                    || tags.seq_number !=
+                                    YAFFS_SEQUENCE_CHECKPOINT_DATA)
+                                        ok = 0;
+
+                                dev->checkpt_byte_offs = 0;
+                                dev->checkpt_page_seq++;
+                                dev->checkpt_cur_chunk++;
+
+                                if (dev->checkpt_cur_chunk >=
+                                    dev->param.chunks_per_block)
+                                        dev->checkpt_cur_block = -1;
+                        }
+                }
+
+                if (ok) {
+                        *data_bytes =
+                            dev->checkpt_buffer[dev->checkpt_byte_offs];
+                        dev->checkpt_sum += *data_bytes;
+                        dev->checkpt_xor ^= *data_bytes;
+                        dev->checkpt_byte_offs++;
+                        i++;
+                        data_bytes++;
+                        dev->checkpt_byte_count++;
+                }
+        }
+
+        return i;
+}
+
+int yaffs_checkpt_close(struct yaffs_dev *dev)
+{
+
+        if (dev->checkpt_open_write) {
+                if (dev->checkpt_byte_offs != 0)
+                        yaffs2_checkpt_flush_buffer(dev);
+        } else if (dev->checkpt_block_list) {
+                int i;
+                for (i = 0;
+                     i < dev->blocks_in_checkpt
+                     && dev->checkpt_block_list[i] >= 0; i++) {
+                        int blk = dev->checkpt_block_list[i];
+                        struct yaffs_block_info *bi = NULL;
+                        if (dev->internal_start_block <= blk
+                            && blk <= dev->internal_end_block)
+                                bi = yaffs_get_block_info(dev, blk);
+                        if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY)
+                                bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+                        else {
+                                /* Todo this looks odd... */
+                        }
+                }
+                kfree(dev->checkpt_block_list);
+                dev->checkpt_block_list = NULL;
+        }
+
+        dev->n_free_chunks -=
+            dev->blocks_in_checkpt * dev->param.chunks_per_block;
+        dev->n_erased_blocks -= dev->blocks_in_checkpt;
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,"checkpoint byte count %d",
+                dev->checkpt_byte_count);
+
+        if (dev->checkpt_buffer) {
+                /* free the buffer */
+                kfree(dev->checkpt_buffer);
+                dev->checkpt_buffer = NULL;
+                return 1;
+        } else {
+                return 0;
+        }
+}
+
+int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev)
+{
+        /* Erase the checkpoint data */
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "checkpoint invalidate of %d blocks",
+                dev->blocks_in_checkpt);
+
+        return yaffs_checkpt_erase(dev);
+}
diff --git a/fs/yaffs2/yaffs_checkptrw.h b/fs/yaffs2/yaffs_checkptrw.h
new file mode 100644
index 00000000000..361c6067717
--- /dev/null
+++ b/fs/yaffs2/yaffs_checkptrw.h
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_CHECKPTRW_H__
+#define __YAFFS_CHECKPTRW_H__
+
+#include "yaffs_guts.h"
+
+int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing);
+
+int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes);
+
+int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes);
+
+int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum);
+
+int yaffs_checkpt_close(struct yaffs_dev *dev);
+
+int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev);
+
+#endif
diff --git a/fs/yaffs2/yaffs_ecc.c b/fs/yaffs2/yaffs_ecc.c
new file mode 100644
index 00000000000..e95a8069a8c
--- /dev/null
+++ b/fs/yaffs2/yaffs_ecc.c
@@ -0,0 +1,298 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC
+ * blocks are used on a 512-byte NAND page.
+ *
+ */
+
+/* Table generated by gen-ecc.c
+ * Using a table means we do not have to calculate p1..p4 and p1'..p4'
+ * for each byte of data. These are instead provided in a table in bits7..2.
+ * Bit 0 of each entry indicates whether the entry has an odd or even parity, and therefore
+ * this bytes influence on the line parity.
+ */
+
+#include "yportenv.h"
+
+#include "yaffs_ecc.h"
+
+static const unsigned char column_parity_table[] = {
+        0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
+        0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+        0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
+        0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+        0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
+        0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+        0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
+        0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+        0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
+        0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+        0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
+        0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+        0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
+        0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+        0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
+        0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+        0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
+        0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+        0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
+        0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+        0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
+        0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+        0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
+        0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+        0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
+        0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+        0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
+        0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+        0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
+        0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+        0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
+        0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+};
+
+
+/* Calculate the ECC for a 256-byte block of data */
+void yaffs_ecc_cacl(const unsigned char *data, unsigned char *ecc)
+{
+        unsigned int i;
+
+        unsigned char col_parity = 0;
+        unsigned char line_parity = 0;
+        unsigned char line_parity_prime = 0;
+        unsigned char t;
+        unsigned char b;
+
+        for (i = 0; i < 256; i++) {
+                b = column_parity_table[*data++];
+                col_parity ^= b;
+
+                if (b & 0x01) { /* odd number of bits in the byte */
+                        line_parity ^= i;
+                        line_parity_prime ^= ~i;
+                }
+        }
+
+        ecc[2] = (~col_parity) | 0x03;
+
+        t = 0;
+        if (line_parity & 0x80)
+                t |= 0x80;
+        if (line_parity_prime & 0x80)
+                t |= 0x40;
+        if (line_parity & 0x40)
+                t |= 0x20;
+        if (line_parity_prime & 0x40)
+                t |= 0x10;
+        if (line_parity & 0x20)
+                t |= 0x08;
+        if (line_parity_prime & 0x20)
+                t |= 0x04;
+        if (line_parity & 0x10)
+                t |= 0x02;
+        if (line_parity_prime & 0x10)
+                t |= 0x01;
+        ecc[1] = ~t;
+
+        t = 0;
+        if (line_parity & 0x08)
+                t |= 0x80;
+        if (line_parity_prime & 0x08)
+                t |= 0x40;
+        if (line_parity & 0x04)
+                t |= 0x20;
+        if (line_parity_prime & 0x04)
+                t |= 0x10;
+        if (line_parity & 0x02)
+                t |= 0x08;
+        if (line_parity_prime & 0x02)
+                t |= 0x04;
+        if (line_parity & 0x01)
+                t |= 0x02;
+        if (line_parity_prime & 0x01)
+                t |= 0x01;
+        ecc[0] = ~t;
+
+#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
+        /* Swap the bytes into the wrong order */
+        t = ecc[0];
+        ecc[0] = ecc[1];
+        ecc[1] = t;
+#endif
+}
+
+/* Correct the ECC on a 256 byte block of data */
+
+int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
+                      const unsigned char *test_ecc)
+{
+        unsigned char d0, d1, d2;       /* deltas */
+
+        d0 = read_ecc[0] ^ test_ecc[0];
+        d1 = read_ecc[1] ^ test_ecc[1];
+        d2 = read_ecc[2] ^ test_ecc[2];
+
+        if ((d0 | d1 | d2) == 0)
+                return 0;       /* no error */
+
+        if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
+            ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
+            ((d2 ^ (d2 >> 1)) & 0x54) == 0x54) {
+                /* Single bit (recoverable) error in data */
+
+                unsigned byte;
+                unsigned bit;
+
+#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
+                /* swap the bytes to correct for the wrong order */
+                unsigned char t;
+
+                t = d0;
+                d0 = d1;
+                d1 = t;
+#endif
+
+                bit = byte = 0;
+
+                if (d1 & 0x80)
+                        byte |= 0x80;
+                if (d1 & 0x20)
+                        byte |= 0x40;
+                if (d1 & 0x08)
+                        byte |= 0x20;
+                if (d1 & 0x02)
+                        byte |= 0x10;
+                if (d0 & 0x80)
+                        byte |= 0x08;
+                if (d0 & 0x20)
+                        byte |= 0x04;
+                if (d0 & 0x08)
+                        byte |= 0x02;
+                if (d0 & 0x02)
+                        byte |= 0x01;
+
+                if (d2 & 0x80)
+                        bit |= 0x04;
+                if (d2 & 0x20)
+                        bit |= 0x02;
+                if (d2 & 0x08)
+                        bit |= 0x01;
+
+                data[byte] ^= (1 << bit);
+
+                return 1;       /* Corrected the error */
+        }
+
+        if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) {
+                /* Reccoverable error in ecc */
+
+                read_ecc[0] = test_ecc[0];
+                read_ecc[1] = test_ecc[1];
+                read_ecc[2] = test_ecc[2];
+
+                return 1;       /* Corrected the error */
+        }
+
+        /* Unrecoverable error */
+
+        return -1;
+
+}
+
+/*
+ * ECCxxxOther does ECC calcs on arbitrary n bytes of data
+ */
+void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
+                          struct yaffs_ecc_other *ecc_other)
+{
+        unsigned int i;
+
+        unsigned char col_parity = 0;
+        unsigned line_parity = 0;
+        unsigned line_parity_prime = 0;
+        unsigned char b;
+
+        for (i = 0; i < n_bytes; i++) {
+                b = column_parity_table[*data++];
+                col_parity ^= b;
+
+                if (b & 0x01) {
+                        /* odd number of bits in the byte */
+                        line_parity ^= i;
+                        line_parity_prime ^= ~i;
+                }
+
+        }
+
+        ecc_other->col_parity = (col_parity >> 2) & 0x3f;
+        ecc_other->line_parity = line_parity;
+        ecc_other->line_parity_prime = line_parity_prime;
+}
+
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+                            struct yaffs_ecc_other *read_ecc,
+                            const struct yaffs_ecc_other *test_ecc)
+{
+        unsigned char delta_col;        /* column parity delta */
+        unsigned delta_line;    /* line parity delta */
+        unsigned delta_line_prime;      /* line parity delta */
+        unsigned bit;
+
+        delta_col = read_ecc->col_parity ^ test_ecc->col_parity;
+        delta_line = read_ecc->line_parity ^ test_ecc->line_parity;
+        delta_line_prime =
+            read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
+
+        if ((delta_col | delta_line | delta_line_prime) == 0)
+                return 0;       /* no error */
+
+        if (delta_line == ~delta_line_prime &&
+            (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
+                /* Single bit (recoverable) error in data */
+
+                bit = 0;
+
+                if (delta_col & 0x20)
+                        bit |= 0x04;
+                if (delta_col & 0x08)
+                        bit |= 0x02;
+                if (delta_col & 0x02)
+                        bit |= 0x01;
+
+                if (delta_line >= n_bytes)
+                        return -1;
+
+                data[delta_line] ^= (1 << bit);
+
+                return 1;       /* corrected */
+        }
+
+        if ((hweight32(delta_line) +
+             hweight32(delta_line_prime) +
+             hweight8(delta_col)) == 1) {
+                /* Reccoverable error in ecc */
+
+                *read_ecc = *test_ecc;
+                return 1;       /* corrected */
+        }
+
+        /* Unrecoverable error */
+
+        return -1;
+}
diff --git a/fs/yaffs2/yaffs_ecc.h b/fs/yaffs2/yaffs_ecc.h
new file mode 100644
index 00000000000..b0c461d699e
--- /dev/null
+++ b/fs/yaffs2/yaffs_ecc.h
@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC
+ * blocks are used on a 512-byte NAND page.
+ *
+ */
+
+#ifndef __YAFFS_ECC_H__
+#define __YAFFS_ECC_H__
+
+struct yaffs_ecc_other {
+        unsigned char col_parity;
+        unsigned line_parity;
+        unsigned line_parity_prime;
+};
+
+void yaffs_ecc_cacl(const unsigned char *data, unsigned char *ecc);
+int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
+                      const unsigned char *test_ecc);
+
+void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
+                          struct yaffs_ecc_other *ecc);
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+                            struct yaffs_ecc_other *read_ecc,
+                            const struct yaffs_ecc_other *test_ecc);
+#endif
diff --git a/fs/yaffs2/yaffs_getblockinfo.h b/fs/yaffs2/yaffs_getblockinfo.h
new file mode 100644
index 00000000000..d87acbde997
--- /dev/null
+++ b/fs/yaffs2/yaffs_getblockinfo.h
@@ -0,0 +1,35 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_GETBLOCKINFO_H__
+#define __YAFFS_GETBLOCKINFO_H__
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+
+/* Function to manipulate block info */
+static inline struct yaffs_block_info *yaffs_get_block_info(struct yaffs_dev
+                                                              *dev, int blk)
+{
+        if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "**>> yaffs: get_block_info block %d is not valid",
+                        blk);
+                YBUG();
+        }
+        return &dev->block_info[blk - dev->internal_start_block];
+}
+
+#endif
diff --git a/fs/yaffs2/yaffs_guts.c b/fs/yaffs2/yaffs_guts.c
new file mode 100644
index 00000000000..f4ae9deed72
--- /dev/null
+++ b/fs/yaffs2/yaffs_guts.c
@@ -0,0 +1,5164 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_guts.h"
+#include "yaffs_tagsvalidity.h"
+#include "yaffs_getblockinfo.h"
+
+#include "yaffs_tagscompat.h"
+
+#include "yaffs_nand.h"
+
+#include "yaffs_yaffs1.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_verify.h"
+
+#include "yaffs_nand.h"
+#include "yaffs_packedtags2.h"
+
+#include "yaffs_nameval.h"
+#include "yaffs_allocator.h"
+
+#include "yaffs_attribs.h"
+
+/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
+#define YAFFS_GC_GOOD_ENOUGH 2
+#define YAFFS_GC_PASSIVE_THRESHOLD 4
+
+#include "yaffs_ecc.h"
+
+/* Forward declarations */
+
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+                             const u8 * buffer, int n_bytes, int use_reserve);
+
+
+
+/* Function to calculate chunk and offset */
+
+static void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
+                                int *chunk_out, u32 * offset_out)
+{
+        int chunk;
+        u32 offset;
+
+        chunk = (u32) (addr >> dev->chunk_shift);
+
+        if (dev->chunk_div == 1) {
+                /* easy power of 2 case */
+                offset = (u32) (addr & dev->chunk_mask);
+        } else {
+                /* Non power-of-2 case */
+
+                loff_t chunk_base;
+
+                chunk /= dev->chunk_div;
+
+                chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
+                offset = (u32) (addr - chunk_base);
+        }
+
+        *chunk_out = chunk;
+        *offset_out = offset;
+}
+
+/* Function to return the number of shifts for a power of 2 greater than or
+ * equal to the given number
+ * Note we don't try to cater for all possible numbers and this does not have to
+ * be hellishly efficient.
+ */
+
+static u32 calc_shifts_ceiling(u32 x)
+{
+        int extra_bits;
+        int shifts;
+
+        shifts = extra_bits = 0;
+
+        while (x > 1) {
+                if (x & 1)
+                        extra_bits++;
+                x >>= 1;
+                shifts++;
+        }
+
+        if (extra_bits)
+                shifts++;
+
+        return shifts;
+}
+
+/* Function to return the number of shifts to get a 1 in bit 0
+ */
+
+static u32 calc_shifts(u32 x)
+{
+        u32 shifts;
+
+        shifts = 0;
+
+        if (!x)
+                return 0;
+
+        while (!(x & 1)) {
+                x >>= 1;
+                shifts++;
+        }
+
+        return shifts;
+}
+
+/*
+ * Temporary buffer manipulations.
+ */
+
+static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
+{
+        int i;
+        u8 *buf = (u8 *) 1;
+
+        memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
+
+        for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
+                dev->temp_buffer[i].line = 0;   /* not in use */
+                dev->temp_buffer[i].buffer = buf =
+                    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+        }
+
+        return buf ? YAFFS_OK : YAFFS_FAIL;
+}
+
+u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev, int line_no)
+{
+        int i, j;
+
+        dev->temp_in_use++;
+        if (dev->temp_in_use > dev->max_temp)
+                dev->max_temp = dev->temp_in_use;
+
+        for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+                if (dev->temp_buffer[i].line == 0) {
+                        dev->temp_buffer[i].line = line_no;
+                        if ((i + 1) > dev->max_temp) {
+                                dev->max_temp = i + 1;
+                                for (j = 0; j <= i; j++)
+                                        dev->temp_buffer[j].max_line =
+                                            dev->temp_buffer[j].line;
+                        }
+
+                        return dev->temp_buffer[i].buffer;
+                }
+        }
+
+        yaffs_trace(YAFFS_TRACE_BUFFERS,
+                "Out of temp buffers at line %d, other held by lines:",
+                line_no);
+        for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+                yaffs_trace(YAFFS_TRACE_BUFFERS," %d", dev->temp_buffer[i].line);
+
+        /*
+         * If we got here then we have to allocate an unmanaged one
+         * This is not good.
+         */
+
+        dev->unmanaged_buffer_allocs++;
+        return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
+
+}
+
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 * buffer, int line_no)
+{
+        int i;
+
+        dev->temp_in_use--;
+
+        for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+                if (dev->temp_buffer[i].buffer == buffer) {
+                        dev->temp_buffer[i].line = 0;
+                        return;
+                }
+        }
+
+        if (buffer) {
+                /* assume it is an unmanaged one. */
+                yaffs_trace(YAFFS_TRACE_BUFFERS,
+                  "Releasing unmanaged temp buffer in line %d",
+                   line_no);
+                kfree(buffer);
+                dev->unmanaged_buffer_deallocs++;
+        }
+
+}
+
+/*
+ * Determine if we have a managed buffer.
+ */
+int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 * buffer)
+{
+        int i;
+
+        for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+                if (dev->temp_buffer[i].buffer == buffer)
+                        return 1;
+        }
+
+        for (i = 0; i < dev->param.n_caches; i++) {
+                if (dev->cache[i].data == buffer)
+                        return 1;
+        }
+
+        if (buffer == dev->checkpt_buffer)
+                return 1;
+
+        yaffs_trace(YAFFS_TRACE_ALWAYS,
+          "yaffs: unmaged buffer detected.");
+        return 0;
+}
+
+/*
+ * Functions for robustisizing TODO
+ *
+ */
+
+static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
+                                     const u8 * data,
+                                     const struct yaffs_ext_tags *tags)
+{
+        dev = dev;
+        nand_chunk = nand_chunk;
+        data = data;
+        tags = tags;
+}
+
+static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
+                                      const struct yaffs_ext_tags *tags)
+{
+        dev = dev;
+        nand_chunk = nand_chunk;
+        tags = tags;
+}
+
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+                              struct yaffs_block_info *bi)
+{
+        if (!bi->gc_prioritise) {
+                bi->gc_prioritise = 1;
+                dev->has_pending_prioritised_gc = 1;
+                bi->chunk_error_strikes++;
+
+                if (bi->chunk_error_strikes > 3) {
+                        bi->needs_retiring = 1; /* Too many stikes, so retire this */
+                        yaffs_trace(YAFFS_TRACE_ALWAYS, "yaffs: Block struck out");
+
+                }
+        }
+}
+
+static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
+                                        int erased_ok)
+{
+        int flash_block = nand_chunk / dev->param.chunks_per_block;
+        struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+
+        yaffs_handle_chunk_error(dev, bi);
+
+        if (erased_ok) {
+                /* Was an actual write failure, so mark the block for retirement  */
+                bi->needs_retiring = 1;
+                yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                  "**>> Block %d needs retiring", flash_block);
+        }
+
+        /* Delete the chunk */
+        yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+        yaffs_skip_rest_of_block(dev);
+}
+
+/*
+ * Verification code
+ */
+
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
+
+static inline int yaffs_hash_fn(int n)
+{
+        n = abs(n);
+        return n % YAFFS_NOBJECT_BUCKETS;
+}
+
+/*
+ * Access functions to useful fake objects.
+ * Note that root might have a presence in NAND if permissions are set.
+ */
+
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
+{
+        return dev->root_dir;
+}
+
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
+{
+        return dev->lost_n_found;
+}
+
+/*
+ *  Erased NAND checking functions
+ */
+
+int yaffs_check_ff(u8 * buffer, int n_bytes)
+{
+        /* Horrible, slow implementation */
+        while (n_bytes--) {
+                if (*buffer != 0xFF)
+                        return 0;
+                buffer++;
+        }
+        return 1;
+}
+
+static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
+{
+        int retval = YAFFS_OK;
+        u8 *data = yaffs_get_temp_buffer(dev, __LINE__);
+        struct yaffs_ext_tags tags;
+        int result;
+
+        result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
+
+        if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
+                retval = YAFFS_FAIL;
+
+        if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
+                tags.chunk_used) {
+                yaffs_trace(YAFFS_TRACE_NANDACCESS, "Chunk %d not erased", nand_chunk);
+                retval = YAFFS_FAIL;
+        }
+
+        yaffs_release_temp_buffer(dev, data, __LINE__);
+
+        return retval;
+
+}
+
+static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
+                                      int nand_chunk,
+                                      const u8 * data,
+                                      struct yaffs_ext_tags *tags)
+{
+        int retval = YAFFS_OK;
+        struct yaffs_ext_tags temp_tags;
+        u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
+        int result;
+
+        result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
+        if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
+            temp_tags.obj_id != tags->obj_id ||
+            temp_tags.chunk_id != tags->chunk_id ||
+            temp_tags.n_bytes != tags->n_bytes)
+                retval = YAFFS_FAIL;
+
+        yaffs_release_temp_buffer(dev, buffer, __LINE__);
+
+        return retval;
+}
+
+
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
+{
+        int reserved_chunks;
+        int reserved_blocks = dev->param.n_reserved_blocks;
+        int checkpt_blocks;
+
+        checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
+
+        reserved_chunks =
+            ((reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block);
+
+        return (dev->n_free_chunks > (reserved_chunks + n_chunks));
+}
+
+static int yaffs_find_alloc_block(struct yaffs_dev *dev)
+{
+        int i;
+
+        struct yaffs_block_info *bi;
+
+        if (dev->n_erased_blocks < 1) {
+                /* Hoosterman we've got a problem.
+                 * Can't get space to gc
+                 */
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                  "yaffs tragedy: no more erased blocks" );
+
+                return -1;
+        }
+
+        /* Find an empty block. */
+
+        for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+                dev->alloc_block_finder++;
+                if (dev->alloc_block_finder < dev->internal_start_block
+                    || dev->alloc_block_finder > dev->internal_end_block) {
+                        dev->alloc_block_finder = dev->internal_start_block;
+                }
+
+                bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
+
+                if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+                        bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
+                        dev->seq_number++;
+                        bi->seq_number = dev->seq_number;
+                        dev->n_erased_blocks--;
+                        yaffs_trace(YAFFS_TRACE_ALLOCATE,
+                          "Allocated block %d, seq  %d, %d left" ,
+                           dev->alloc_block_finder, dev->seq_number,
+                           dev->n_erased_blocks);
+                        return dev->alloc_block_finder;
+                }
+        }
+
+        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                "yaffs tragedy: no more erased blocks, but there should have been %d",
+                dev->n_erased_blocks);
+
+        return -1;
+}
+
+static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
+                             struct yaffs_block_info **block_ptr)
+{
+        int ret_val;
+        struct yaffs_block_info *bi;
+
+        if (dev->alloc_block < 0) {
+                /* Get next block to allocate off */
+                dev->alloc_block = yaffs_find_alloc_block(dev);
+                dev->alloc_page = 0;
+        }
+
+        if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
+                /* Not enough space to allocate unless we're allowed to use the reserve. */
+                return -1;
+        }
+
+        if (dev->n_erased_blocks < dev->param.n_reserved_blocks
+            && dev->alloc_page == 0)
+                yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
+
+        /* Next page please.... */
+        if (dev->alloc_block >= 0) {
+                bi = yaffs_get_block_info(dev, dev->alloc_block);
+
+                ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
+                    dev->alloc_page;
+                bi->pages_in_use++;
+                yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
+
+                dev->alloc_page++;
+
+                dev->n_free_chunks--;
+
+                /* If the block is full set the state to full */
+                if (dev->alloc_page >= dev->param.chunks_per_block) {
+                        bi->block_state = YAFFS_BLOCK_STATE_FULL;
+                        dev->alloc_block = -1;
+                }
+
+                if (block_ptr)
+                        *block_ptr = bi;
+
+                return ret_val;
+        }
+
+        yaffs_trace(YAFFS_TRACE_ERROR, "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" );
+
+        return -1;
+}
+
+static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
+{
+        int n;
+
+        n = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+        if (dev->alloc_block > 0)
+                n += (dev->param.chunks_per_block - dev->alloc_page);
+
+        return n;
+
+}
+
+/*
+ * yaffs_skip_rest_of_block() skips over the rest of the allocation block
+ * if we don't want to write to it.
+ */
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
+{
+        if (dev->alloc_block > 0) {
+                struct yaffs_block_info *bi =
+                    yaffs_get_block_info(dev, dev->alloc_block);
+                if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+                        bi->block_state = YAFFS_BLOCK_STATE_FULL;
+                        dev->alloc_block = -1;
+                }
+        }
+}
+
+static int yaffs_write_new_chunk(struct yaffs_dev *dev,
+                                 const u8 * data,
+                                 struct yaffs_ext_tags *tags, int use_reserver)
+{
+        int attempts = 0;
+        int write_ok = 0;
+        int chunk;
+
+        yaffs2_checkpt_invalidate(dev);
+
+        do {
+                struct yaffs_block_info *bi = 0;
+                int erased_ok = 0;
+
+                chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
+                if (chunk < 0) {
+                        /* no space */
+                        break;
+                }
+
+                /* First check this chunk is erased, if it needs
+                 * checking.  The checking policy (unless forced
+                 * always on) is as follows:
+                 *
+                 * Check the first page we try to write in a block.
+                 * If the check passes then we don't need to check any
+                 * more.        If the check fails, we check again...
+                 * If the block has been erased, we don't need to check.
+                 *
+                 * However, if the block has been prioritised for gc,
+                 * then we think there might be something odd about
+                 * this block and stop using it.
+                 *
+                 * Rationale: We should only ever see chunks that have
+                 * not been erased if there was a partially written
+                 * chunk due to power loss.  This checking policy should
+                 * catch that case with very few checks and thus save a
+                 * lot of checks that are most likely not needed.
+                 *
+                 * Mods to the above
+                 * If an erase check fails or the write fails we skip the 
+                 * rest of the block.
+                 */
+
+                /* let's give it a try */
+                attempts++;
+
+                if (dev->param.always_check_erased)
+                        bi->skip_erased_check = 0;
+
+                if (!bi->skip_erased_check) {
+                        erased_ok = yaffs_check_chunk_erased(dev, chunk);
+                        if (erased_ok != YAFFS_OK) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                  "**>> yaffs chunk %d was not erased",
+                                  chunk);
+
+                                /* If not erased, delete this one,
+                                 * skip rest of block and
+                                 * try another chunk */
+                                yaffs_chunk_del(dev, chunk, 1, __LINE__);
+                                yaffs_skip_rest_of_block(dev);
+                                continue;
+                        }
+                }
+
+                write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
+
+                if (!bi->skip_erased_check)
+                        write_ok =
+                            yaffs_verify_chunk_written(dev, chunk, data, tags);
+
+                if (write_ok != YAFFS_OK) {
+                        /* Clean up aborted write, skip to next block and
+                         * try another chunk */
+                        yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
+                        continue;
+                }
+
+                bi->skip_erased_check = 1;
+
+                /* Copy the data into the robustification buffer */
+                yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
+
+        } while (write_ok != YAFFS_OK &&
+                 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
+
+        if (!write_ok)
+                chunk = -1;
+
+        if (attempts > 1) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "**>> yaffs write required %d attempts",
+                        attempts);
+                dev->n_retired_writes += (attempts - 1);
+        }
+
+        return chunk;
+}
+
+/*
+ * Block retiring for handling a broken block.
+ */
+
+static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
+{
+        struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+
+        yaffs2_checkpt_invalidate(dev);
+
+        yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+        if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
+                if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
+                        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                "yaffs: Failed to mark bad and erase block %d",
+                                flash_block);
+                } else {
+                        struct yaffs_ext_tags tags;
+                        int chunk_id =
+                            flash_block * dev->param.chunks_per_block;
+
+                        u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+                        memset(buffer, 0xff, dev->data_bytes_per_chunk);
+                        yaffs_init_tags(&tags);
+                        tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
+                        if (dev->param.write_chunk_tags_fn(dev, chunk_id -
+                                                           dev->chunk_offset,
+                                                           buffer,
+                                                           &tags) != YAFFS_OK)
+                                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                        "yaffs: Failed to write bad block marker to block %d",
+                                        flash_block);
+
+                        yaffs_release_temp_buffer(dev, buffer, __LINE__);
+                }
+        }
+
+        bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+        bi->gc_prioritise = 0;
+        bi->needs_retiring = 0;
+
+        dev->n_retired_blocks++;
+}
+
+/*---------------- Name handling functions ------------*/
+
+static u16 yaffs_calc_name_sum(const YCHAR * name)
+{
+        u16 sum = 0;
+        u16 i = 1;
+
+        const YUCHAR *bname = (const YUCHAR *)name;
+        if (bname) {
+                while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH / 2))) {
+
+                        /* 0x1f mask is case insensitive */
+                        sum += ((*bname) & 0x1f) * i;
+                        i++;
+                        bname++;
+                }
+        }
+        return sum;
+}
+
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
+{
+#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
+        memset(obj->short_name, 0, sizeof(obj->short_name));
+        if (name && 
+                strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
+            YAFFS_SHORT_NAME_LENGTH)
+                strcpy(obj->short_name, name);
+        else
+                obj->short_name[0] = _Y('\0');
+#endif
+        obj->sum = yaffs_calc_name_sum(name);
+}
+
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+                                const struct yaffs_obj_hdr *oh)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+        YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
+        memset(tmp_name, 0, sizeof(tmp_name));
+        yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
+                                YAFFS_MAX_NAME_LENGTH + 1);
+        yaffs_set_obj_name(obj, tmp_name);
+#else
+        yaffs_set_obj_name(obj, oh->name);
+#endif
+}
+
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
+{
+        struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
+        if (tn) {
+                memset(tn, 0, dev->tnode_size);
+                dev->n_tnodes++;
+        }
+
+        dev->checkpoint_blocks_required = 0;    /* force recalculation */
+
+        return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+        yaffs_free_raw_tnode(dev, tn);
+        dev->n_tnodes--;
+        dev->checkpoint_blocks_required = 0;    /* force recalculation */
+}
+
+static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
+{
+        yaffs_deinit_raw_tnodes_and_objs(dev);
+        dev->n_obj = 0;
+        dev->n_tnodes = 0;
+}
+
+void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+                        unsigned pos, unsigned val)
+{
+        u32 *map = (u32 *) tn;
+        u32 bit_in_map;
+        u32 bit_in_word;
+        u32 word_in_map;
+        u32 mask;
+
+        pos &= YAFFS_TNODES_LEVEL0_MASK;
+        val >>= dev->chunk_grp_bits;
+
+        bit_in_map = pos * dev->tnode_width;
+        word_in_map = bit_in_map / 32;
+        bit_in_word = bit_in_map & (32 - 1);
+
+        mask = dev->tnode_mask << bit_in_word;
+
+        map[word_in_map] &= ~mask;
+        map[word_in_map] |= (mask & (val << bit_in_word));
+
+        if (dev->tnode_width > (32 - bit_in_word)) {
+                bit_in_word = (32 - bit_in_word);
+                word_in_map++;;
+                mask =
+                    dev->tnode_mask >> ( /*dev->tnode_width - */ bit_in_word);
+                map[word_in_map] &= ~mask;
+                map[word_in_map] |= (mask & (val >> bit_in_word));
+        }
+}
+
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+                         unsigned pos)
+{
+        u32 *map = (u32 *) tn;
+        u32 bit_in_map;
+        u32 bit_in_word;
+        u32 word_in_map;
+        u32 val;
+
+        pos &= YAFFS_TNODES_LEVEL0_MASK;
+
+        bit_in_map = pos * dev->tnode_width;
+        word_in_map = bit_in_map / 32;
+        bit_in_word = bit_in_map & (32 - 1);
+
+        val = map[word_in_map] >> bit_in_word;
+
+        if (dev->tnode_width > (32 - bit_in_word)) {
+                bit_in_word = (32 - bit_in_word);
+                word_in_map++;;
+                val |= (map[word_in_map] << bit_in_word);
+        }
+
+        val &= dev->tnode_mask;
+        val <<= dev->chunk_grp_bits;
+
+        return val;
+}
+
+/* ------------------- End of individual tnode manipulation -----------------*/
+
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of top_level
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+                                       struct yaffs_file_var *file_struct,
+                                       u32 chunk_id)
+{
+        struct yaffs_tnode *tn = file_struct->top;
+        u32 i;
+        int required_depth;
+        int level = file_struct->top_level;
+
+        dev = dev;
+
+        /* Check sane level and chunk Id */
+        if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+                return NULL;
+
+        if (chunk_id > YAFFS_MAX_CHUNK_ID)
+                return NULL;
+
+        /* First check we're tall enough (ie enough top_level) */
+
+        i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+        required_depth = 0;
+        while (i) {
+                i >>= YAFFS_TNODES_INTERNAL_BITS;
+                required_depth++;
+        }
+
+        if (required_depth > file_struct->top_level)
+                return NULL;    /* Not tall enough, so we can't find it */
+
+        /* Traverse down to level 0 */
+        while (level > 0 && tn) {
+                tn = tn->internal[(chunk_id >>
+                                   (YAFFS_TNODES_LEVEL0_BITS +
+                                    (level - 1) *
+                                    YAFFS_TNODES_INTERNAL_BITS)) &
+                                  YAFFS_TNODES_INTERNAL_MASK];
+                level--;
+        }
+
+        return tn;
+}
+
+/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+ * This happens in two steps:
+ *  1. If the tree isn't tall enough, then make it taller.
+ *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
+ *  be plugged into the ttree.
+ */
+
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+                                           struct yaffs_file_var *file_struct,
+                                           u32 chunk_id,
+                                           struct yaffs_tnode *passed_tn)
+{
+        int required_depth;
+        int i;
+        int l;
+        struct yaffs_tnode *tn;
+
+        u32 x;
+
+        /* Check sane level and page Id */
+        if (file_struct->top_level < 0
+            || file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
+                return NULL;
+
+        if (chunk_id > YAFFS_MAX_CHUNK_ID)
+                return NULL;
+
+        /* First check we're tall enough (ie enough top_level) */
+
+        x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+        required_depth = 0;
+        while (x) {
+                x >>= YAFFS_TNODES_INTERNAL_BITS;
+                required_depth++;
+        }
+
+        if (required_depth > file_struct->top_level) {
+                /* Not tall enough, gotta make the tree taller */
+                for (i = file_struct->top_level; i < required_depth; i++) {
+
+                        tn = yaffs_get_tnode(dev);
+
+                        if (tn) {
+                                tn->internal[0] = file_struct->top;
+                                file_struct->top = tn;
+                                file_struct->top_level++;
+                        } else {
+                                yaffs_trace(YAFFS_TRACE_ERROR, "yaffs: no more tnodes");
+                                return NULL;
+                        }
+                }
+        }
+
+        /* Traverse down to level 0, adding anything we need */
+
+        l = file_struct->top_level;
+        tn = file_struct->top;
+
+        if (l > 0) {
+                while (l > 0 && tn) {
+                        x = (chunk_id >>
+                             (YAFFS_TNODES_LEVEL0_BITS +
+                              (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+                            YAFFS_TNODES_INTERNAL_MASK;
+
+                        if ((l > 1) && !tn->internal[x]) {
+                                /* Add missing non-level-zero tnode */
+                                tn->internal[x] = yaffs_get_tnode(dev);
+                                if (!tn->internal[x])
+                                        return NULL;
+                        } else if (l == 1) {
+                                /* Looking from level 1 at level 0 */
+                                if (passed_tn) {
+                                        /* If we already have one, then release it. */
+                                        if (tn->internal[x])
+                                                yaffs_free_tnode(dev,
+                                                                 tn->
+                                                                 internal[x]);
+                                        tn->internal[x] = passed_tn;
+
+                                } else if (!tn->internal[x]) {
+                                        /* Don't have one, none passed in */
+                                        tn->internal[x] = yaffs_get_tnode(dev);
+                                        if (!tn->internal[x])
+                                                return NULL;
+                                }
+                        }
+
+                        tn = tn->internal[x];
+                        l--;
+                }
+        } else {
+                /* top is level 0 */
+                if (passed_tn) {
+                        memcpy(tn, passed_tn,
+                               (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
+                        yaffs_free_tnode(dev, passed_tn);
+                }
+        }
+
+        return tn;
+}
+
+static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
+                            int chunk_obj)
+{
+        return (tags->chunk_id == chunk_obj &&
+                tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0;
+
+}
+
+static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
+                                     struct yaffs_ext_tags *tags, int obj_id,
+                                     int inode_chunk)
+{
+        int j;
+
+        for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
+                if (yaffs_check_chunk_bit
+                    (dev, the_chunk / dev->param.chunks_per_block,
+                     the_chunk % dev->param.chunks_per_block)) {
+
+                        if (dev->chunk_grp_size == 1)
+                                return the_chunk;
+                        else {
+                                yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
+                                                         tags);
+                                if (yaffs_tags_match(tags, obj_id, inode_chunk)) {
+                                        /* found it; */
+                                        return the_chunk;
+                                }
+                        }
+                }
+                the_chunk++;
+        }
+        return -1;
+}
+
+static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+                                    struct yaffs_ext_tags *tags)
+{
+        /*Get the Tnode, then get the level 0 offset chunk offset */
+        struct yaffs_tnode *tn;
+        int the_chunk = -1;
+        struct yaffs_ext_tags local_tags;
+        int ret_val = -1;
+
+        struct yaffs_dev *dev = in->my_dev;
+
+        if (!tags) {
+                /* Passed a NULL, so use our own tags space */
+                tags = &local_tags;
+        }
+
+        tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+        if (tn) {
+                the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+                ret_val =
+                    yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+                                              inode_chunk);
+        }
+        return ret_val;
+}
+
+static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
+                                     struct yaffs_ext_tags *tags)
+{
+        /* Get the Tnode, then get the level 0 offset chunk offset */
+        struct yaffs_tnode *tn;
+        int the_chunk = -1;
+        struct yaffs_ext_tags local_tags;
+
+        struct yaffs_dev *dev = in->my_dev;
+        int ret_val = -1;
+
+        if (!tags) {
+                /* Passed a NULL, so use our own tags space */
+                tags = &local_tags;
+        }
+
+        tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+        if (tn) {
+
+                the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+                ret_val =
+                    yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+                                              inode_chunk);
+
+                /* Delete the entry in the filestructure (if found) */
+                if (ret_val != -1)
+                        yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
+        }
+
+        return ret_val;
+}
+
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+                            int nand_chunk, int in_scan)
+{
+        /* NB in_scan is zero unless scanning.
+         * For forward scanning, in_scan is > 0;
+         * for backward scanning in_scan is < 0
+         *
+         * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
+         */
+
+        struct yaffs_tnode *tn;
+        struct yaffs_dev *dev = in->my_dev;
+        int existing_cunk;
+        struct yaffs_ext_tags existing_tags;
+        struct yaffs_ext_tags new_tags;
+        unsigned existing_serial, new_serial;
+
+        if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
+                /* Just ignore an attempt at putting a chunk into a non-file during scanning
+                 * If it is not during Scanning then something went wrong!
+                 */
+                if (!in_scan) {
+                        yaffs_trace(YAFFS_TRACE_ERROR,
+                                "yaffs tragedy:attempt to put data chunk into a non-file"
+                                );
+                        YBUG();
+                }
+
+                yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+                return YAFFS_OK;
+        }
+
+        tn = yaffs_add_find_tnode_0(dev,
+                                    &in->variant.file_variant,
+                                    inode_chunk, NULL);
+        if (!tn)
+                return YAFFS_FAIL;
+
+        if (!nand_chunk)
+                /* Dummy insert, bail now */
+                return YAFFS_OK;
+
+        existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+        if (in_scan != 0) {
+                /* If we're scanning then we need to test for duplicates
+                 * NB This does not need to be efficient since it should only ever
+                 * happen when the power fails during a write, then only one
+                 * chunk should ever be affected.
+                 *
+                 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
+                 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
+                 */
+
+                if (existing_cunk > 0) {
+                        /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1
+                         *    thus we have to do a FindChunkInFile to get the real chunk id.
+                         *
+                         * We have a duplicate now we need to decide which one to use:
+                         *
+                         * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
+                         * Forward scanning YAFFS2: The new one is what we use, dump the old one.
+                         * YAFFS1: Get both sets of tags and compare serial numbers.
+                         */
+
+                        if (in_scan > 0) {
+                                /* Only do this for forward scanning */
+                                yaffs_rd_chunk_tags_nand(dev,
+                                                         nand_chunk,
+                                                         NULL, &new_tags);
+
+                                /* Do a proper find */
+                                existing_cunk =
+                                    yaffs_find_chunk_in_file(in, inode_chunk,
+                                                             &existing_tags);
+                        }
+
+                        if (existing_cunk <= 0) {
+                                /*Hoosterman - how did this happen? */
+
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        "yaffs tragedy: existing chunk < 0 in scan"
+                                        );
+
+                        }
+
+                        /* NB The deleted flags should be false, otherwise the chunks will
+                         * not be loaded during a scan
+                         */
+
+                        if (in_scan > 0) {
+                                new_serial = new_tags.serial_number;
+                                existing_serial = existing_tags.serial_number;
+                        }
+
+                        if ((in_scan > 0) &&
+                            (existing_cunk <= 0 ||
+                             ((existing_serial + 1) & 3) == new_serial)) {
+                                /* Forward scanning.
+                                 * Use new
+                                 * Delete the old one and drop through to update the tnode
+                                 */
+                                yaffs_chunk_del(dev, existing_cunk, 1,
+                                                __LINE__);
+                        } else {
+                                /* Backward scanning or we want to use the existing one
+                                 * Use existing.
+                                 * Delete the new one and return early so that the tnode isn't changed
+                                 */
+                                yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+                                return YAFFS_OK;
+                        }
+                }
+
+        }
+
+        if (existing_cunk == 0)
+                in->n_data_chunks++;
+
+        yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
+
+        return YAFFS_OK;
+}
+
+static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
+{
+        struct yaffs_block_info *the_block;
+        unsigned block_no;
+
+        yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
+
+        block_no = chunk / dev->param.chunks_per_block;
+        the_block = yaffs_get_block_info(dev, block_no);
+        if (the_block) {
+                the_block->soft_del_pages++;
+                dev->n_free_chunks++;
+                yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
+        }
+}
+
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls the chunk out
+ * of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
+ */
+
+static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
+                                 u32 level, int chunk_offset)
+{
+        int i;
+        int the_chunk;
+        int all_done = 1;
+        struct yaffs_dev *dev = in->my_dev;
+
+        if (tn) {
+                if (level > 0) {
+
+                        for (i = YAFFS_NTNODES_INTERNAL - 1; all_done && i >= 0;
+                             i--) {
+                                if (tn->internal[i]) {
+                                        all_done =
+                                            yaffs_soft_del_worker(in,
+                                                                  tn->internal
+                                                                  [i],
+                                                                  level - 1,
+                                                                  (chunk_offset
+                                                                   <<
+                                                                   YAFFS_TNODES_INTERNAL_BITS)
+                                                                  + i);
+                                        if (all_done) {
+                                                yaffs_free_tnode(dev,
+                                                                 tn->internal
+                                                                 [i]);
+                                                tn->internal[i] = NULL;
+                                        } else {
+                                                /* Hoosterman... how could this happen? */
+                                        }
+                                }
+                        }
+                        return (all_done) ? 1 : 0;
+                } else if (level == 0) {
+
+                        for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+                                the_chunk = yaffs_get_group_base(dev, tn, i);
+                                if (the_chunk) {
+                                        /* Note this does not find the real chunk, only the chunk group.
+                                         * We make an assumption that a chunk group is not larger than
+                                         * a block.
+                                         */
+                                        yaffs_soft_del_chunk(dev, the_chunk);
+                                        yaffs_load_tnode_0(dev, tn, i, 0);
+                                }
+
+                        }
+                        return 1;
+
+                }
+
+        }
+
+        return 1;
+
+}
+
+static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
+{
+        struct yaffs_dev *dev = obj->my_dev;
+        struct yaffs_obj *parent;
+
+        yaffs_verify_obj_in_dir(obj);
+        parent = obj->parent;
+
+        yaffs_verify_dir(parent);
+
+        if (dev && dev->param.remove_obj_fn)
+                dev->param.remove_obj_fn(obj);
+
+        list_del_init(&obj->siblings);
+        obj->parent = NULL;
+
+        yaffs_verify_dir(parent);
+}
+
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
+{
+        if (!directory) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "tragedy: Trying to add an object to a null pointer directory"
+                        );
+                YBUG();
+                return;
+        }
+        if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "tragedy: Trying to add an object to a non-directory"
+                        );
+                YBUG();
+        }
+
+        if (obj->siblings.prev == NULL) {
+                /* Not initialised */
+                YBUG();
+        }
+
+        yaffs_verify_dir(directory);
+
+        yaffs_remove_obj_from_dir(obj);
+
+        /* Now add it */
+        list_add(&obj->siblings, &directory->variant.dir_variant.children);
+        obj->parent = directory;
+
+        if (directory == obj->my_dev->unlinked_dir
+            || directory == obj->my_dev->del_dir) {
+                obj->unlinked = 1;
+                obj->my_dev->n_unlinked_files++;
+                obj->rename_allowed = 0;
+        }
+
+        yaffs_verify_dir(directory);
+        yaffs_verify_obj_in_dir(obj);
+}
+
+static int yaffs_change_obj_name(struct yaffs_obj *obj,
+                                 struct yaffs_obj *new_dir,
+                                 const YCHAR * new_name, int force, int shadows)
+{
+        int unlink_op;
+        int del_op;
+
+        struct yaffs_obj *existing_target;
+
+        if (new_dir == NULL)
+                new_dir = obj->parent;  /* use the old directory */
+
+        if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "tragedy: yaffs_change_obj_name: new_dir is not a directory"
+                        );
+                YBUG();
+        }
+
+        /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
+        if (obj->my_dev->param.is_yaffs2)
+                unlink_op = (new_dir == obj->my_dev->unlinked_dir);
+        else
+                unlink_op = (new_dir == obj->my_dev->unlinked_dir
+                             && obj->variant_type == YAFFS_OBJECT_TYPE_FILE);
+
+        del_op = (new_dir == obj->my_dev->del_dir);
+
+        existing_target = yaffs_find_by_name(new_dir, new_name);
+
+        /* If the object is a file going into the unlinked directory,
+         *   then it is OK to just stuff it in since duplicate names are allowed.
+         *   else only proceed if the new name does not exist and if we're putting
+         *   it into a directory.
+         */
+        if ((unlink_op ||
+             del_op ||
+             force ||
+             (shadows > 0) ||
+             !existing_target) &&
+            new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
+                yaffs_set_obj_name(obj, new_name);
+                obj->dirty = 1;
+
+                yaffs_add_obj_to_dir(new_dir, obj);
+
+                if (unlink_op)
+                        obj->unlinked = 1;
+
+                /* If it is a deletion then we mark it as a shrink for gc purposes. */
+                if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >=
+                    0)
+                        return YAFFS_OK;
+        }
+
+        return YAFFS_FAIL;
+}
+
+/*------------------------ Short Operations Cache ----------------------------------------
+ *   In many situations where there is no high level buffering  a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance
+ *   benefit with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering and the short op cache 
+ *   provides write buffering.
+ *
+ *   There are a limited number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
+ */
+
+static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
+{
+        struct yaffs_dev *dev = obj->my_dev;
+        int i;
+        struct yaffs_cache *cache;
+        int n_caches = obj->my_dev->param.n_caches;
+
+        for (i = 0; i < n_caches; i++) {
+                cache = &dev->cache[i];
+                if (cache->object == obj && cache->dirty)
+                        return 1;
+        }
+
+        return 0;
+}
+
+static void yaffs_flush_file_cache(struct yaffs_obj *obj)
+{
+        struct yaffs_dev *dev = obj->my_dev;
+        int lowest = -99;       /* Stop compiler whining. */
+        int i;
+        struct yaffs_cache *cache;
+        int chunk_written = 0;
+        int n_caches = obj->my_dev->param.n_caches;
+
+        if (n_caches > 0) {
+                do {
+                        cache = NULL;
+
+                        /* Find the dirty cache for this object with the lowest chunk id. */
+                        for (i = 0; i < n_caches; i++) {
+                                if (dev->cache[i].object == obj &&
+                                    dev->cache[i].dirty) {
+                                        if (!cache
+                                            || dev->cache[i].chunk_id <
+                                            lowest) {
+                                                cache = &dev->cache[i];
+                                                lowest = cache->chunk_id;
+                                        }
+                                }
+                        }
+
+                        if (cache && !cache->locked) {
+                                /* Write it out and free it up */
+
+                                chunk_written =
+                                    yaffs_wr_data_obj(cache->object,
+                                                      cache->chunk_id,
+                                                      cache->data,
+                                                      cache->n_bytes, 1);
+                                cache->dirty = 0;
+                                cache->object = NULL;
+                        }
+
+                } while (cache && chunk_written > 0);
+
+                if (cache)
+                        /* Hoosterman, disk full while writing cache out. */
+                        yaffs_trace(YAFFS_TRACE_ERROR,
+                                "yaffs tragedy: no space during cache write");
+
+        }
+
+}
+
+/*yaffs_flush_whole_cache(dev)
+ *
+ *
+ */
+
+void yaffs_flush_whole_cache(struct yaffs_dev *dev)
+{
+        struct yaffs_obj *obj;
+        int n_caches = dev->param.n_caches;
+        int i;
+
+        /* Find a dirty object in the cache and flush it...
+         * until there are no further dirty objects.
+         */
+        do {
+                obj = NULL;
+                for (i = 0; i < n_caches && !obj; i++) {
+                        if (dev->cache[i].object && dev->cache[i].dirty)
+                                obj = dev->cache[i].object;
+
+                }
+                if (obj)
+                        yaffs_flush_file_cache(obj);
+
+        } while (obj);
+
+}
+
+/* Grab us a cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
+{
+        int i;
+
+        if (dev->param.n_caches > 0) {
+                for (i = 0; i < dev->param.n_caches; i++) {
+                        if (!dev->cache[i].object)
+                                return &dev->cache[i];
+                }
+        }
+
+        return NULL;
+}
+
+static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
+{
+        struct yaffs_cache *cache;
+        struct yaffs_obj *the_obj;
+        int usage;
+        int i;
+        int pushout;
+
+        if (dev->param.n_caches > 0) {
+                /* Try find a non-dirty one... */
+
+                cache = yaffs_grab_chunk_worker(dev);
+
+                if (!cache) {
+                        /* They were all dirty, find the last recently used object and flush
+                         * its cache, then  find again.
+                         * NB what's here is not very accurate, we actually flush the object
+                         * the last recently used page.
+                         */
+
+                        /* With locking we can't assume we can use entry zero */
+
+                        the_obj = NULL;
+                        usage = -1;
+                        cache = NULL;
+                        pushout = -1;
+
+                        for (i = 0; i < dev->param.n_caches; i++) {
+                                if (dev->cache[i].object &&
+                                    !dev->cache[i].locked &&
+                                    (dev->cache[i].last_use < usage
+                                     || !cache)) {
+                                        usage = dev->cache[i].last_use;
+                                        the_obj = dev->cache[i].object;
+                                        cache = &dev->cache[i];
+                                        pushout = i;
+                                }
+                        }
+
+                        if (!cache || cache->dirty) {
+                                /* Flush and try again */
+                                yaffs_flush_file_cache(the_obj);
+                                cache = yaffs_grab_chunk_worker(dev);
+                        }
+
+                }
+                return cache;
+        } else {
+                return NULL;
+        }
+}
+
+/* Find a cached chunk */
+static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
+                                                  int chunk_id)
+{
+        struct yaffs_dev *dev = obj->my_dev;
+        int i;
+        if (dev->param.n_caches > 0) {
+                for (i = 0; i < dev->param.n_caches; i++) {
+                        if (dev->cache[i].object == obj &&
+                            dev->cache[i].chunk_id == chunk_id) {
+                                dev->cache_hits++;
+
+                                return &dev->cache[i];
+                        }
+                }
+        }
+        return NULL;
+}
+
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
+                            int is_write)
+{
+
+        if (dev->param.n_caches > 0) {
+                if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) {
+                        /* Reset the cache usages */
+                        int i;
+                        for (i = 1; i < dev->param.n_caches; i++)
+                                dev->cache[i].last_use = 0;
+
+                        dev->cache_last_use = 0;
+                }
+
+                dev->cache_last_use++;
+
+                cache->last_use = dev->cache_last_use;
+
+                if (is_write)
+                        cache->dirty = 1;
+        }
+}
+
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
+{
+        if (object->my_dev->param.n_caches > 0) {
+                struct yaffs_cache *cache =
+                    yaffs_find_chunk_cache(object, chunk_id);
+
+                if (cache)
+                        cache->object = NULL;
+        }
+}
+
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
+{
+        int i;
+        struct yaffs_dev *dev = in->my_dev;
+
+        if (dev->param.n_caches > 0) {
+                /* Invalidate it. */
+                for (i = 0; i < dev->param.n_caches; i++) {
+                        if (dev->cache[i].object == in)
+                                dev->cache[i].object = NULL;
+                }
+        }
+}
+
+static void yaffs_unhash_obj(struct yaffs_obj *obj)
+{
+        int bucket;
+        struct yaffs_dev *dev = obj->my_dev;
+
+        /* If it is still linked into the bucket list, free from the list */
+        if (!list_empty(&obj->hash_link)) {
+                list_del_init(&obj->hash_link);
+                bucket = yaffs_hash_fn(obj->obj_id);
+                dev->obj_bucket[bucket].count--;
+        }
+}
+
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_free_obj(struct yaffs_obj *obj)
+{
+        struct yaffs_dev *dev = obj->my_dev;
+
+        yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
+                obj, obj->my_inode);
+
+        if (!obj)
+                YBUG();
+        if (obj->parent)
+                YBUG();
+        if (!list_empty(&obj->siblings))
+                YBUG();
+
+        if (obj->my_inode) {
+                /* We're still hooked up to a cached inode.
+                 * Don't delete now, but mark for later deletion
+                 */
+                obj->defered_free = 1;
+                return;
+        }
+
+        yaffs_unhash_obj(obj);
+
+        yaffs_free_raw_obj(dev, obj);
+        dev->n_obj--;
+        dev->checkpoint_blocks_required = 0;    /* force recalculation */
+}
+
+void yaffs_handle_defered_free(struct yaffs_obj *obj)
+{
+        if (obj->defered_free)
+                yaffs_free_obj(obj);
+}
+
+static int yaffs_generic_obj_del(struct yaffs_obj *in)
+{
+
+        /* First off, invalidate the file's data in the cache, without flushing. */
+        yaffs_invalidate_whole_cache(in);
+
+        if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) {
+                /* Move to the unlinked directory so we have a record that it was deleted. */
+                yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
+                                      0);
+
+        }
+
+        yaffs_remove_obj_from_dir(in);
+        yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
+        in->hdr_chunk = 0;
+
+        yaffs_free_obj(in);
+        return YAFFS_OK;
+
+}
+
+static void yaffs_soft_del_file(struct yaffs_obj *obj)
+{
+        if (obj->deleted &&
+            obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) {
+                if (obj->n_data_chunks <= 0) {
+                        /* Empty file with no duplicate object headers,
+                         * just delete it immediately */
+                        yaffs_free_tnode(obj->my_dev,
+                                         obj->variant.file_variant.top);
+                        obj->variant.file_variant.top = NULL;
+                        yaffs_trace(YAFFS_TRACE_TRACING,
+                                "yaffs: Deleting empty file %d",
+                                obj->obj_id);
+                        yaffs_generic_obj_del(obj);
+                } else {
+                        yaffs_soft_del_worker(obj,
+                                              obj->variant.file_variant.top,
+                                              obj->variant.
+                                              file_variant.top_level, 0);
+                        obj->soft_del = 1;
+                }
+        }
+}
+
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
+ */
+
+static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
+                                              struct yaffs_tnode *tn, u32 level,
+                                              int del0)
+{
+        int i;
+        int has_data;
+
+        if (tn) {
+                has_data = 0;
+
+                if (level > 0) {
+                        for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+                                if (tn->internal[i]) {
+                                        tn->internal[i] =
+                                            yaffs_prune_worker(dev,
+                                                               tn->internal[i],
+                                                               level - 1,
+                                                               (i ==
+                                                                0) ? del0 : 1);
+                                }
+
+                                if (tn->internal[i])
+                                        has_data++;
+                        }
+                } else {
+                        int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+                        u32 *map = (u32 *) tn;
+
+                        for (i = 0; !has_data && i < tnode_size_u32; i++) {
+                                if (map[i])
+                                        has_data++;
+                        }
+                }
+
+                if (has_data == 0 && del0) {
+                        /* Free and return NULL */
+
+                        yaffs_free_tnode(dev, tn);
+                        tn = NULL;
+                }
+
+        }
+
+        return tn;
+
+}
+
+static int yaffs_prune_tree(struct yaffs_dev *dev,
+                            struct yaffs_file_var *file_struct)
+{
+        int i;
+        int has_data;
+        int done = 0;
+        struct yaffs_tnode *tn;
+
+        if (file_struct->top_level > 0) {
+                file_struct->top =
+                    yaffs_prune_worker(dev, file_struct->top,
+                                       file_struct->top_level, 0);
+
+                /* Now we have a tree with all the non-zero branches NULL but the height
+                 * is the same as it was.
+                 * Let's see if we can trim internal tnodes to shorten the tree.
+                 * We can do this if only the 0th element in the tnode is in use
+                 * (ie all the non-zero are NULL)
+                 */
+
+                while (file_struct->top_level && !done) {
+                        tn = file_struct->top;
+
+                        has_data = 0;
+                        for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+                                if (tn->internal[i])
+                                        has_data++;
+                        }
+
+                        if (!has_data) {
+                                file_struct->top = tn->internal[0];
+                                file_struct->top_level--;
+                                yaffs_free_tnode(dev, tn);
+                        } else {
+                                done = 1;
+                        }
+                }
+        }
+
+        return YAFFS_OK;
+}
+
+/*-------------------- End of File Structure functions.-------------------*/
+
+/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
+static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
+{
+        struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
+
+        if (obj) {
+                dev->n_obj++;
+
+                /* Now sweeten it up... */
+
+                memset(obj, 0, sizeof(struct yaffs_obj));
+                obj->being_created = 1;
+
+                obj->my_dev = dev;
+                obj->hdr_chunk = 0;
+                obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
+                INIT_LIST_HEAD(&(obj->hard_links));
+                INIT_LIST_HEAD(&(obj->hash_link));
+                INIT_LIST_HEAD(&obj->siblings);
+
+                /* Now make the directory sane */
+                if (dev->root_dir) {
+                        obj->parent = dev->root_dir;
+                        list_add(&(obj->siblings),
+                                 &dev->root_dir->variant.dir_variant.children);
+                }
+
+                /* Add it to the lost and found directory.
+                 * NB Can't put root or lost-n-found in lost-n-found so
+                 * check if lost-n-found exists first
+                 */
+                if (dev->lost_n_found)
+                        yaffs_add_obj_to_dir(dev->lost_n_found, obj);
+
+                obj->being_created = 0;
+        }
+
+        dev->checkpoint_blocks_required = 0;    /* force recalculation */
+
+        return obj;
+}
+
+static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
+{
+        int i;
+        int l = 999;
+        int lowest = 999999;
+
+        /* Search for the shortest list or one that
+         * isn't too long.
+         */
+
+        for (i = 0; i < 10 && lowest > 4; i++) {
+                dev->bucket_finder++;
+                dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
+                if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
+                        lowest = dev->obj_bucket[dev->bucket_finder].count;
+                        l = dev->bucket_finder;
+                }
+
+        }
+
+        return l;
+}
+
+static int yaffs_new_obj_id(struct yaffs_dev *dev)
+{
+        int bucket = yaffs_find_nice_bucket(dev);
+
+        /* Now find an object value that has not already been taken
+         * by scanning the list.
+         */
+
+        int found = 0;
+        struct list_head *i;
+
+        u32 n = (u32) bucket;
+
+        /* yaffs_check_obj_hash_sane();  */
+
+        while (!found) {
+                found = 1;
+                n += YAFFS_NOBJECT_BUCKETS;
+                if (1 || dev->obj_bucket[bucket].count > 0) {
+                        list_for_each(i, &dev->obj_bucket[bucket].list) {
+                                /* If there is already one in the list */
+                                if (i && list_entry(i, struct yaffs_obj,
+                                                    hash_link)->obj_id == n) {
+                                        found = 0;
+                                }
+                        }
+                }
+        }
+
+        return n;
+}
+
+static void yaffs_hash_obj(struct yaffs_obj *in)
+{
+        int bucket = yaffs_hash_fn(in->obj_id);
+        struct yaffs_dev *dev = in->my_dev;
+
+        list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
+        dev->obj_bucket[bucket].count++;
+}
+
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
+{
+        int bucket = yaffs_hash_fn(number);
+        struct list_head *i;
+        struct yaffs_obj *in;
+
+        list_for_each(i, &dev->obj_bucket[bucket].list) {
+                /* Look if it is in the list */
+                if (i) {
+                        in = list_entry(i, struct yaffs_obj, hash_link);
+                        if (in->obj_id == number) {
+
+                                /* Don't tell the VFS about this one if it is defered free */
+                                if (in->defered_free)
+                                        return NULL;
+
+                                return in;
+                        }
+                }
+        }
+
+        return NULL;
+}
+
+struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
+                                enum yaffs_obj_type type)
+{
+        struct yaffs_obj *the_obj = NULL;
+        struct yaffs_tnode *tn = NULL;
+
+        if (number < 0)
+                number = yaffs_new_obj_id(dev);
+
+        if (type == YAFFS_OBJECT_TYPE_FILE) {
+                tn = yaffs_get_tnode(dev);
+                if (!tn)
+                        return NULL;
+        }
+
+        the_obj = yaffs_alloc_empty_obj(dev);
+        if (!the_obj) {
+                if (tn)
+                        yaffs_free_tnode(dev, tn);
+                return NULL;
+        }
+
+        if (the_obj) {
+                the_obj->fake = 0;
+                the_obj->rename_allowed = 1;
+                the_obj->unlink_allowed = 1;
+                the_obj->obj_id = number;
+                yaffs_hash_obj(the_obj);
+                the_obj->variant_type = type;
+                yaffs_load_current_time(the_obj, 1, 1);
+
+                switch (type) {
+                case YAFFS_OBJECT_TYPE_FILE:
+                        the_obj->variant.file_variant.file_size = 0;
+                        the_obj->variant.file_variant.scanned_size = 0;
+                        the_obj->variant.file_variant.shrink_size = ~0; /* max */
+                        the_obj->variant.file_variant.top_level = 0;
+                        the_obj->variant.file_variant.top = tn;
+                        break;
+                case YAFFS_OBJECT_TYPE_DIRECTORY:
+                        INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
+                        INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
+                        break;
+                case YAFFS_OBJECT_TYPE_SYMLINK:
+                case YAFFS_OBJECT_TYPE_HARDLINK:
+                case YAFFS_OBJECT_TYPE_SPECIAL:
+                        /* No action required */
+                        break;
+                case YAFFS_OBJECT_TYPE_UNKNOWN:
+                        /* todo this should not happen */
+                        break;
+                }
+        }
+
+        return the_obj;
+}
+
+static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
+                                               int number, u32 mode)
+{
+
+        struct yaffs_obj *obj =
+            yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+        if (obj) {
+                obj->fake = 1;  /* it is fake so it might have no NAND presence... */
+                obj->rename_allowed = 0;        /* ... and we're not allowed to rename it... */
+                obj->unlink_allowed = 0;        /* ... or unlink it */
+                obj->deleted = 0;
+                obj->unlinked = 0;
+                obj->yst_mode = mode;
+                obj->my_dev = dev;
+                obj->hdr_chunk = 0;     /* Not a valid chunk. */
+        }
+
+        return obj;
+
+}
+
+
+static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
+{
+        int i;
+
+        dev->n_obj = 0;
+        dev->n_tnodes = 0;
+
+        yaffs_init_raw_tnodes_and_objs(dev);
+
+        for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+                INIT_LIST_HEAD(&dev->obj_bucket[i].list);
+                dev->obj_bucket[i].count = 0;
+        }
+}
+
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+                                                 int number,
+                                                 enum yaffs_obj_type type)
+{
+        struct yaffs_obj *the_obj = NULL;
+
+        if (number > 0)
+                the_obj = yaffs_find_by_number(dev, number);
+
+        if (!the_obj)
+                the_obj = yaffs_new_obj(dev, number, type);
+
+        return the_obj;
+
+}
+
+YCHAR *yaffs_clone_str(const YCHAR * str)
+{
+        YCHAR *new_str = NULL;
+        int len;
+
+        if (!str)
+                str = _Y("");
+
+        len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
+        new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
+        if (new_str) {
+                strncpy(new_str, str, len);
+                new_str[len] = 0;
+        }
+        return new_str;
+
+}
+/*
+ *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ *   create dir/a : update dir's mtime/ctime
+ *   rm dir/a:   update dir's mtime/ctime
+ *   modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_update_dirty_dirs must be
+ * called periodically.
+ */
+
+static void yaffs_update_parent(struct yaffs_obj *obj)
+{
+        struct yaffs_dev *dev;
+        if (!obj)
+                return;
+        dev = obj->my_dev;
+        obj->dirty = 1;
+        yaffs_load_current_time(obj, 0, 1);
+        if (dev->param.defered_dir_update) {
+                struct list_head *link = &obj->variant.dir_variant.dirty;
+
+                if (list_empty(link)) {
+                        list_add(link, &dev->dirty_dirs);
+                        yaffs_trace(YAFFS_TRACE_BACKGROUND,
+                          "Added object %d to dirty directories",
+                           obj->obj_id);
+                }
+
+        } else {
+                yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+        }
+}
+
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
+{
+        struct list_head *link;
+        struct yaffs_obj *obj;
+        struct yaffs_dir_var *d_s;
+        union yaffs_obj_var *o_v;
+
+        yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
+
+        while (!list_empty(&dev->dirty_dirs)) {
+                link = dev->dirty_dirs.next;
+                list_del_init(link);
+
+                d_s = list_entry(link, struct yaffs_dir_var, dirty);
+                o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
+                obj = list_entry(o_v, struct yaffs_obj, variant);
+
+                yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
+                        obj->obj_id);
+
+                if (obj->dirty)
+                        yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+        }
+}
+
+/*
+ * Mknod (create) a new object.
+ * equiv_obj only has meaning for a hard link;
+ * alias_str only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
+
+static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
+                                          struct yaffs_obj *parent,
+                                          const YCHAR * name,
+                                          u32 mode,
+                                          u32 uid,
+                                          u32 gid,
+                                          struct yaffs_obj *equiv_obj,
+                                          const YCHAR * alias_str, u32 rdev)
+{
+        struct yaffs_obj *in;
+        YCHAR *str = NULL;
+
+        struct yaffs_dev *dev = parent->my_dev;
+
+        /* Check if the entry exists. If it does then fail the call since we don't want a dup. */
+        if (yaffs_find_by_name(parent, name))
+                return NULL;
+
+        if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+                str = yaffs_clone_str(alias_str);
+                if (!str)
+                        return NULL;
+        }
+
+        in = yaffs_new_obj(dev, -1, type);
+
+        if (!in) {
+                if (str)
+                        kfree(str);
+                return NULL;
+        }
+
+        if (in) {
+                in->hdr_chunk = 0;
+                in->valid = 1;
+                in->variant_type = type;
+
+                in->yst_mode = mode;
+
+                yaffs_attribs_init(in, gid, uid, rdev);
+
+                in->n_data_chunks = 0;
+
+                yaffs_set_obj_name(in, name);
+                in->dirty = 1;
+
+                yaffs_add_obj_to_dir(parent, in);
+
+                in->my_dev = parent->my_dev;
+
+                switch (type) {
+                case YAFFS_OBJECT_TYPE_SYMLINK:
+                        in->variant.symlink_variant.alias = str;
+                        break;
+                case YAFFS_OBJECT_TYPE_HARDLINK:
+                        in->variant.hardlink_variant.equiv_obj = equiv_obj;
+                        in->variant.hardlink_variant.equiv_id =
+                            equiv_obj->obj_id;
+                        list_add(&in->hard_links, &equiv_obj->hard_links);
+                        break;
+                case YAFFS_OBJECT_TYPE_FILE:
+                case YAFFS_OBJECT_TYPE_DIRECTORY:
+                case YAFFS_OBJECT_TYPE_SPECIAL:
+                case YAFFS_OBJECT_TYPE_UNKNOWN:
+                        /* do nothing */
+                        break;
+                }
+
+                if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
+                        /* Could not create the object header, fail the creation */
+                        yaffs_del_obj(in);
+                        in = NULL;
+                }
+
+                yaffs_update_parent(parent);
+        }
+
+        return in;
+}
+
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+                                    const YCHAR * name, u32 mode, u32 uid,
+                                    u32 gid)
+{
+        return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+                                uid, gid, NULL, NULL, 0);
+}
+
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name,
+                                   u32 mode, u32 uid, u32 gid)
+{
+        return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+                                mode, uid, gid, NULL, NULL, 0);
+}
+
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+                                       const YCHAR * name, u32 mode, u32 uid,
+                                       u32 gid, u32 rdev)
+{
+        return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+                                uid, gid, NULL, NULL, rdev);
+}
+
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+                                       const YCHAR * name, u32 mode, u32 uid,
+                                       u32 gid, const YCHAR * alias)
+{
+        return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+                                uid, gid, NULL, alias, 0);
+}
+
+/* yaffs_link_obj returns the object id of the equivalent object.*/
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
+                                 struct yaffs_obj *equiv_obj)
+{
+        /* Get the real object in case we were fed a hard link as an equivalent object */
+        equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
+
+        if (yaffs_create_obj
+            (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
+             equiv_obj, NULL, 0)) {
+                return equiv_obj;
+        } else {
+                return NULL;
+        }
+
+}
+
+
+
+/*------------------------- Block Management and Page Allocation ----------------*/
+
+static int yaffs_init_blocks(struct yaffs_dev *dev)
+{
+        int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+        dev->block_info = NULL;
+        dev->chunk_bits = NULL;
+
+        dev->alloc_block = -1;  /* force it to get a new one */
+
+        /* If the first allocation strategy fails, thry the alternate one */
+        dev->block_info =
+                kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
+        if (!dev->block_info) {
+                dev->block_info =
+                    vmalloc(n_blocks * sizeof(struct yaffs_block_info));
+                dev->block_info_alt = 1;
+        } else {
+                dev->block_info_alt = 0;
+        }
+
+        if (dev->block_info) {
+                /* Set up dynamic blockinfo stuff. Round up bytes. */
+                dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
+                dev->chunk_bits =
+                        kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
+                if (!dev->chunk_bits) {
+                        dev->chunk_bits =
+                            vmalloc(dev->chunk_bit_stride * n_blocks);
+                        dev->chunk_bits_alt = 1;
+                } else {
+                        dev->chunk_bits_alt = 0;
+                }
+        }
+
+        if (dev->block_info && dev->chunk_bits) {
+                memset(dev->block_info, 0,
+                       n_blocks * sizeof(struct yaffs_block_info));
+                memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
+                return YAFFS_OK;
+        }
+
+        return YAFFS_FAIL;
+}
+
+static void yaffs_deinit_blocks(struct yaffs_dev *dev)
+{
+        if (dev->block_info_alt && dev->block_info)
+                vfree(dev->block_info);
+        else if (dev->block_info)
+                kfree(dev->block_info);
+
+        dev->block_info_alt = 0;
+
+        dev->block_info = NULL;
+
+        if (dev->chunk_bits_alt && dev->chunk_bits)
+                vfree(dev->chunk_bits);
+        else if (dev->chunk_bits)
+                kfree(dev->chunk_bits);
+        dev->chunk_bits_alt = 0;
+        dev->chunk_bits = NULL;
+}
+
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
+{
+        struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
+
+        int erased_ok = 0;
+
+        /* If the block is still healthy erase it and mark as clean.
+         * If the block has had a data failure, then retire it.
+         */
+
+        yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+                "yaffs_block_became_dirty block %d state %d %s",
+                block_no, bi->block_state,
+                (bi->needs_retiring) ? "needs retiring" : "");
+
+        yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+        bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
+
+        /* If this is the block being garbage collected then stop gc'ing this block */
+        if (block_no == dev->gc_block)
+                dev->gc_block = 0;
+
+        /* If this block is currently the best candidate for gc then drop as a candidate */
+        if (block_no == dev->gc_dirtiest) {
+                dev->gc_dirtiest = 0;
+                dev->gc_pages_in_use = 0;
+        }
+
+        if (!bi->needs_retiring) {
+                yaffs2_checkpt_invalidate(dev);
+                erased_ok = yaffs_erase_block(dev, block_no);
+                if (!erased_ok) {
+                        dev->n_erase_failures++;
+                        yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                          "**>> Erasure failed %d", block_no);
+                }
+        }
+
+        if (erased_ok &&
+            ((yaffs_trace_mask & YAFFS_TRACE_ERASE)
+             || !yaffs_skip_verification(dev))) {
+                int i;
+                for (i = 0; i < dev->param.chunks_per_block; i++) {
+                        if (!yaffs_check_chunk_erased
+                            (dev, block_no * dev->param.chunks_per_block + i)) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        ">>Block %d erasure supposedly OK, but chunk %d not erased",
+                                        block_no, i);
+                        }
+                }
+        }
+
+        if (erased_ok) {
+                /* Clean it up... */
+                bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+                bi->seq_number = 0;
+                dev->n_erased_blocks++;
+                bi->pages_in_use = 0;
+                bi->soft_del_pages = 0;
+                bi->has_shrink_hdr = 0;
+                bi->skip_erased_check = 1;      /* Clean, so no need to check */
+                bi->gc_prioritise = 0;
+                yaffs_clear_chunk_bits(dev, block_no);
+
+                yaffs_trace(YAFFS_TRACE_ERASE,
+                        "Erased block %d", block_no);
+        } else {
+                /* We lost a block of free space */
+                dev->n_free_chunks -= dev->param.chunks_per_block;
+                yaffs_retire_block(dev, block_no);
+                yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                        "**>> Block %d retired", block_no);
+        }
+}
+
+
+
+static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
+{
+        int old_chunk;
+        int new_chunk;
+        int mark_flash;
+        int ret_val = YAFFS_OK;
+        int i;
+        int is_checkpt_block;
+        int matching_chunk;
+        int max_copies;
+
+        int chunks_before = yaffs_get_erased_chunks(dev);
+        int chunks_after;
+
+        struct yaffs_ext_tags tags;
+
+        struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
+
+        struct yaffs_obj *object;
+
+        is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
+
+        yaffs_trace(YAFFS_TRACE_TRACING,
+                "Collecting block %d, in use %d, shrink %d, whole_block %d",
+                block, bi->pages_in_use, bi->has_shrink_hdr,
+                whole_block);
+
+        /*yaffs_verify_free_chunks(dev); */
+
+        if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
+                bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
+
+        bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
+
+        dev->gc_disable = 1;
+
+        if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
+                yaffs_trace(YAFFS_TRACE_TRACING,
+                        "Collecting block %d that has no chunks in use",
+                        block);
+                yaffs_block_became_dirty(dev, block);
+        } else {
+
+                u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+                yaffs_verify_blk(dev, bi, block);
+
+                max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
+                old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
+
+                for ( /* init already done */ ;
+                     ret_val == YAFFS_OK &&
+                     dev->gc_chunk < dev->param.chunks_per_block &&
+                     (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
+                     max_copies > 0; dev->gc_chunk++, old_chunk++) {
+                        if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
+
+                                /* This page is in use and might need to be copied off */
+
+                                max_copies--;
+
+                                mark_flash = 1;
+
+                                yaffs_init_tags(&tags);
+
+                                yaffs_rd_chunk_tags_nand(dev, old_chunk,
+                                                         buffer, &tags);
+
+                                object = yaffs_find_by_number(dev, tags.obj_id);
+
+                                yaffs_trace(YAFFS_TRACE_GC_DETAIL,
+                                        "Collecting chunk in block %d, %d %d %d ",
+                                        dev->gc_chunk, tags.obj_id,
+                                        tags.chunk_id, tags.n_bytes);
+
+                                if (object && !yaffs_skip_verification(dev)) {
+                                        if (tags.chunk_id == 0)
+                                                matching_chunk =
+                                                    object->hdr_chunk;
+                                        else if (object->soft_del)
+                                                matching_chunk = old_chunk;     /* Defeat the test */
+                                        else
+                                                matching_chunk =
+                                                    yaffs_find_chunk_in_file
+                                                    (object, tags.chunk_id,
+                                                     NULL);
+
+                                        if (old_chunk != matching_chunk)
+                                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                                        "gc: page in gc mismatch: %d %d %d %d",
+                                                        old_chunk,
+                                                        matching_chunk,
+                                                        tags.obj_id,
+                                                        tags.chunk_id);
+
+                                }
+
+                                if (!object) {
+                                        yaffs_trace(YAFFS_TRACE_ERROR,
+                                                "page %d in gc has no object: %d %d %d ",
+                                                old_chunk,
+                                                tags.obj_id, tags.chunk_id,
+                                                tags.n_bytes);
+                                }
+
+                                if (object &&
+                                    object->deleted &&
+                                    object->soft_del && tags.chunk_id != 0) {
+                                        /* Data chunk in a soft deleted file, throw it away
+                                         * It's a soft deleted data chunk,
+                                         * No need to copy this, just forget about it and
+                                         * fix up the object.
+                                         */
+
+                                        /* Free chunks already includes softdeleted chunks.
+                                         * How ever this chunk is going to soon be really deleted
+                                         * which will increment free chunks.
+                                         * We have to decrement free chunks so this works out properly.
+                                         */
+                                        dev->n_free_chunks--;
+                                        bi->soft_del_pages--;
+
+                                        object->n_data_chunks--;
+
+                                        if (object->n_data_chunks <= 0) {
+                                                /* remeber to clean up the object */
+                                                dev->gc_cleanup_list[dev->
+                                                                     n_clean_ups]
+                                                    = tags.obj_id;
+                                                dev->n_clean_ups++;
+                                        }
+                                        mark_flash = 0;
+                                } else if (0) {
+                                        /* Todo object && object->deleted && object->n_data_chunks == 0 */
+                                        /* Deleted object header with no data chunks.
+                                         * Can be discarded and the file deleted.
+                                         */
+                                        object->hdr_chunk = 0;
+                                        yaffs_free_tnode(object->my_dev,
+                                                         object->
+                                                         variant.file_variant.
+                                                         top);
+                                        object->variant.file_variant.top = NULL;
+                                        yaffs_generic_obj_del(object);
+
+                                } else if (object) {
+                                        /* It's either a data chunk in a live file or
+                                         * an ObjectHeader, so we're interested in it.
+                                         * NB Need to keep the ObjectHeaders of deleted files
+                                         * until the whole file has been deleted off
+                                         */
+                                        tags.serial_number++;
+
+                                        dev->n_gc_copies++;
+
+                                        if (tags.chunk_id == 0) {
+                                                /* It is an object Id,
+                                                 * We need to nuke the shrinkheader flags first
+                                                 * Also need to clean up shadowing.
+                                                 * We no longer want the shrink_header flag since its work is done
+                                                 * and if it is left in place it will mess up scanning.
+                                                 */
+
+                                                struct yaffs_obj_hdr *oh;
+                                                oh = (struct yaffs_obj_hdr *)
+                                                    buffer;
+
+                                                oh->is_shrink = 0;
+                                                tags.extra_is_shrink = 0;
+
+                                                oh->shadows_obj = 0;
+                                                oh->inband_shadowed_obj_id = 0;
+                                                tags.extra_shadows = 0;
+
+                                                /* Update file size */
+                                                if (object->variant_type ==
+                                                    YAFFS_OBJECT_TYPE_FILE) {
+                                                        oh->file_size =
+                                                            object->variant.
+                                                            file_variant.
+                                                            file_size;
+                                                        tags.extra_length =
+                                                            oh->file_size;
+                                                }
+
+                                                yaffs_verify_oh(object, oh,
+                                                                &tags, 1);
+                                                new_chunk =
+                                                    yaffs_write_new_chunk(dev,
+                                                                          (u8 *)
+                                                                          oh,
+                                                                          &tags,
+                                                                          1);
+                                        } else {
+                                                new_chunk =
+                                                    yaffs_write_new_chunk(dev,
+                                                                          buffer,
+                                                                          &tags,
+                                                                          1);
+                                        }
+
+                                        if (new_chunk < 0) {
+                                                ret_val = YAFFS_FAIL;
+                                        } else {
+
+                                                /* Ok, now fix up the Tnodes etc. */
+
+                                                if (tags.chunk_id == 0) {
+                                                        /* It's a header */
+                                                        object->hdr_chunk =
+                                                            new_chunk;
+                                                        object->serial =
+                                                            tags.serial_number;
+                                                } else {
+                                                        /* It's a data chunk */
+                                                        int ok;
+                                                        ok = yaffs_put_chunk_in_file(object, tags.chunk_id, new_chunk, 0);
+                                                }
+                                        }
+                                }
+
+                                if (ret_val == YAFFS_OK)
+                                        yaffs_chunk_del(dev, old_chunk,
+                                                        mark_flash, __LINE__);
+
+                        }
+                }
+
+                yaffs_release_temp_buffer(dev, buffer, __LINE__);
+
+        }
+
+        yaffs_verify_collected_blk(dev, bi, block);
+
+        if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+                /*
+                 * The gc did not complete. Set block state back to FULL
+                 * because checkpointing does not restore gc.
+                 */
+                bi->block_state = YAFFS_BLOCK_STATE_FULL;
+        } else {
+                /* The gc completed. */
+                /* Do any required cleanups */
+                for (i = 0; i < dev->n_clean_ups; i++) {
+                        /* Time to delete the file too */
+                        object =
+                            yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
+                        if (object) {
+                                yaffs_free_tnode(dev,
+                                                 object->variant.
+                                                 file_variant.top);
+                                object->variant.file_variant.top = NULL;
+                                yaffs_trace(YAFFS_TRACE_GC,
+                                        "yaffs: About to finally delete object %d",
+                                        object->obj_id);
+                                yaffs_generic_obj_del(object);
+                                object->my_dev->n_deleted_files--;
+                        }
+
+                }
+
+                chunks_after = yaffs_get_erased_chunks(dev);
+                if (chunks_before >= chunks_after)
+                        yaffs_trace(YAFFS_TRACE_GC,
+                                "gc did not increase free chunks before %d after %d",
+                                chunks_before, chunks_after);
+                dev->gc_block = 0;
+                dev->gc_chunk = 0;
+                dev->n_clean_ups = 0;
+        }
+
+        dev->gc_disable = 0;
+
+        return ret_val;
+}
+
+/*
+ * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
+ * for garbage collection.
+ */
+
+static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
+                                    int aggressive, int background)
+{
+        int i;
+        int iterations;
+        unsigned selected = 0;
+        int prioritised = 0;
+        int prioritised_exist = 0;
+        struct yaffs_block_info *bi;
+        int threshold;
+
+        /* First let's see if we need to grab a prioritised block */
+        if (dev->has_pending_prioritised_gc && !aggressive) {
+                dev->gc_dirtiest = 0;
+                bi = dev->block_info;
+                for (i = dev->internal_start_block;
+                     i <= dev->internal_end_block && !selected; i++) {
+
+                        if (bi->gc_prioritise) {
+                                prioritised_exist = 1;
+                                if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+                                    yaffs_block_ok_for_gc(dev, bi)) {
+                                        selected = i;
+                                        prioritised = 1;
+                                }
+                        }
+                        bi++;
+                }
+
+                /*
+                 * If there is a prioritised block and none was selected then
+                 * this happened because there is at least one old dirty block gumming
+                 * up the works. Let's gc the oldest dirty block.
+                 */
+
+                if (prioritised_exist &&
+                    !selected && dev->oldest_dirty_block > 0)
+                        selected = dev->oldest_dirty_block;
+
+                if (!prioritised_exist) /* None found, so we can clear this */
+                        dev->has_pending_prioritised_gc = 0;
+        }
+
+        /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
+         * search harder.
+         * else (we're doing a leasurely gc), then we only bother to do this if the
+         * block has only a few pages in use.
+         */
+
+        if (!selected) {
+                int pages_used;
+                int n_blocks =
+                    dev->internal_end_block - dev->internal_start_block + 1;
+                if (aggressive) {
+                        threshold = dev->param.chunks_per_block;
+                        iterations = n_blocks;
+                } else {
+                        int max_threshold;
+
+                        if (background)
+                                max_threshold = dev->param.chunks_per_block / 2;
+                        else
+                                max_threshold = dev->param.chunks_per_block / 8;
+
+                        if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+                                max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+
+                        threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
+                        if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+                                threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+                        if (threshold > max_threshold)
+                                threshold = max_threshold;
+
+                        iterations = n_blocks / 16 + 1;
+                        if (iterations > 100)
+                                iterations = 100;
+                }
+
+                for (i = 0;
+                     i < iterations &&
+                     (dev->gc_dirtiest < 1 ||
+                      dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH); i++) {
+                        dev->gc_block_finder++;
+                        if (dev->gc_block_finder < dev->internal_start_block ||
+                            dev->gc_block_finder > dev->internal_end_block)
+                                dev->gc_block_finder =
+                                    dev->internal_start_block;
+
+                        bi = yaffs_get_block_info(dev, dev->gc_block_finder);
+
+                        pages_used = bi->pages_in_use - bi->soft_del_pages;
+
+                        if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+                            pages_used < dev->param.chunks_per_block &&
+                            (dev->gc_dirtiest < 1
+                             || pages_used < dev->gc_pages_in_use)
+                            && yaffs_block_ok_for_gc(dev, bi)) {
+                                dev->gc_dirtiest = dev->gc_block_finder;
+                                dev->gc_pages_in_use = pages_used;
+                        }
+                }
+
+                if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
+                        selected = dev->gc_dirtiest;
+        }
+
+        /*
+         * If nothing has been selected for a while, try selecting the oldest dirty
+         * because that's gumming up the works.
+         */
+
+        if (!selected && dev->param.is_yaffs2 &&
+            dev->gc_not_done >= (background ? 10 : 20)) {
+                yaffs2_find_oldest_dirty_seq(dev);
+                if (dev->oldest_dirty_block > 0) {
+                        selected = dev->oldest_dirty_block;
+                        dev->gc_dirtiest = selected;
+                        dev->oldest_dirty_gc_count++;
+                        bi = yaffs_get_block_info(dev, selected);
+                        dev->gc_pages_in_use =
+                            bi->pages_in_use - bi->soft_del_pages;
+                } else {
+                        dev->gc_not_done = 0;
+                }
+        }
+
+        if (selected) {
+                yaffs_trace(YAFFS_TRACE_GC,
+                        "GC Selected block %d with %d free, prioritised:%d",
+                        selected,
+                        dev->param.chunks_per_block - dev->gc_pages_in_use,
+                        prioritised);
+
+                dev->n_gc_blocks++;
+                if (background)
+                        dev->bg_gcs++;
+
+                dev->gc_dirtiest = 0;
+                dev->gc_pages_in_use = 0;
+                dev->gc_not_done = 0;
+                if (dev->refresh_skip > 0)
+                        dev->refresh_skip--;
+        } else {
+                dev->gc_not_done++;
+                yaffs_trace(YAFFS_TRACE_GC,
+                        "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
+                        dev->gc_block_finder, dev->gc_not_done, threshold,
+                        dev->gc_dirtiest, dev->gc_pages_in_use,
+                        dev->oldest_dirty_block, background ? " bg" : "");
+        }
+
+        return selected;
+}
+
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and will only accept more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_check_gc(struct yaffs_dev *dev, int background)
+{
+        int aggressive = 0;
+        int gc_ok = YAFFS_OK;
+        int max_tries = 0;
+        int min_erased;
+        int erased_chunks;
+        int checkpt_block_adjust;
+
+        if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
+                return YAFFS_OK;
+
+        if (dev->gc_disable) {
+                /* Bail out so we don't get recursive gc */
+                return YAFFS_OK;
+        }
+
+        /* This loop should pass the first time.
+         * We'll only see looping here if the collection does not increase space.
+         */
+
+        do {
+                max_tries++;
+
+                checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
+
+                min_erased =
+                    dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
+                erased_chunks =
+                    dev->n_erased_blocks * dev->param.chunks_per_block;
+
+                /* If we need a block soon then do aggressive gc. */
+                if (dev->n_erased_blocks < min_erased)
+                        aggressive = 1;
+                else {
+                        if (!background
+                            && erased_chunks > (dev->n_free_chunks / 4))
+                                break;
+
+                        if (dev->gc_skip > 20)
+                                dev->gc_skip = 20;
+                        if (erased_chunks < dev->n_free_chunks / 2 ||
+                            dev->gc_skip < 1 || background)
+                                aggressive = 0;
+                        else {
+                                dev->gc_skip--;
+                                break;
+                        }
+                }
+
+                dev->gc_skip = 5;
+
+                /* If we don't already have a block being gc'd then see if we should start another */
+
+                if (dev->gc_block < 1 && !aggressive) {
+                        dev->gc_block = yaffs2_find_refresh_block(dev);
+                        dev->gc_chunk = 0;
+                        dev->n_clean_ups = 0;
+                }
+                if (dev->gc_block < 1) {
+                        dev->gc_block =
+                            yaffs_find_gc_block(dev, aggressive, background);
+                        dev->gc_chunk = 0;
+                        dev->n_clean_ups = 0;
+                }
+
+                if (dev->gc_block > 0) {
+                        dev->all_gcs++;
+                        if (!aggressive)
+                                dev->passive_gc_count++;
+
+                        yaffs_trace(YAFFS_TRACE_GC,
+                                "yaffs: GC n_erased_blocks %d aggressive %d",
+                                dev->n_erased_blocks, aggressive);
+
+                        gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
+                }
+
+                if (dev->n_erased_blocks < (dev->param.n_reserved_blocks)
+                    && dev->gc_block > 0) {
+                        yaffs_trace(YAFFS_TRACE_GC,
+                                "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
+                                dev->n_erased_blocks, max_tries,
+                                dev->gc_block);
+                }
+        } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
+                 (dev->gc_block > 0) && (max_tries < 2));
+
+        return aggressive ? gc_ok : YAFFS_OK;
+}
+
+/*
+ * yaffs_bg_gc()
+ * Garbage collects. Intended to be called from a background thread.
+ * Returns non-zero if at least half the free chunks are erased.
+ */
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
+{
+        int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+        yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
+
+        yaffs_check_gc(dev, 1);
+        return erased_chunks > dev->n_free_chunks / 2;
+}
+
+/*-------------------- Data file manipulation -----------------*/
+
+static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
+{
+        int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
+
+        if (nand_chunk >= 0)
+                return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
+                                                buffer, NULL);
+        else {
+                yaffs_trace(YAFFS_TRACE_NANDACCESS,
+                        "Chunk %d not found zero instead",
+                        nand_chunk);
+                /* get sane (zero) data if you read a hole */
+                memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
+                return 0;
+        }
+
+}
+
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+                     int lyn)
+{
+        int block;
+        int page;
+        struct yaffs_ext_tags tags;
+        struct yaffs_block_info *bi;
+
+        if (chunk_id <= 0)
+                return;
+
+        dev->n_deletions++;
+        block = chunk_id / dev->param.chunks_per_block;
+        page = chunk_id % dev->param.chunks_per_block;
+
+        if (!yaffs_check_chunk_bit(dev, block, page))
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Deleting invalid chunk %d", chunk_id);
+
+        bi = yaffs_get_block_info(dev, block);
+
+        yaffs2_update_oldest_dirty_seq(dev, block, bi);
+
+        yaffs_trace(YAFFS_TRACE_DELETION,
+                "line %d delete of chunk %d",
+                lyn, chunk_id);
+
+        if (!dev->param.is_yaffs2 && mark_flash &&
+            bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
+
+                yaffs_init_tags(&tags);
+
+                tags.is_deleted = 1;
+
+                yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
+                yaffs_handle_chunk_update(dev, chunk_id, &tags);
+        } else {
+                dev->n_unmarked_deletions++;
+        }
+
+        /* Pull out of the management area.
+         * If the whole block became dirty, this will kick off an erasure.
+         */
+        if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
+            bi->block_state == YAFFS_BLOCK_STATE_FULL ||
+            bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+            bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+                dev->n_free_chunks++;
+
+                yaffs_clear_chunk_bit(dev, block, page);
+
+                bi->pages_in_use--;
+
+                if (bi->pages_in_use == 0 &&
+                    !bi->has_shrink_hdr &&
+                    bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
+                    bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+                        yaffs_block_became_dirty(dev, block);
+                }
+
+        }
+
+}
+
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+                             const u8 * buffer, int n_bytes, int use_reserve)
+{
+        /* Find old chunk Need to do this to get serial number
+         * Write new one and patch into tree.
+         * Invalidate old tags.
+         */
+
+        int prev_chunk_id;
+        struct yaffs_ext_tags prev_tags;
+
+        int new_chunk_id;
+        struct yaffs_ext_tags new_tags;
+
+        struct yaffs_dev *dev = in->my_dev;
+
+        yaffs_check_gc(dev, 0);
+
+        /* Get the previous chunk at this location in the file if it exists.
+         * If it does not exist then put a zero into the tree. This creates
+         * the tnode now, rather than later when it is harder to clean up.
+         */
+        prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
+        if (prev_chunk_id < 1 &&
+            !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
+                return 0;
+
+        /* Set up new tags */
+        yaffs_init_tags(&new_tags);
+
+        new_tags.chunk_id = inode_chunk;
+        new_tags.obj_id = in->obj_id;
+        new_tags.serial_number =
+            (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
+        new_tags.n_bytes = n_bytes;
+
+        if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                  "Writing %d bytes to chunk!!!!!!!!!",
+                   n_bytes);
+                YBUG();
+        }
+
+        new_chunk_id =
+            yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
+
+        if (new_chunk_id > 0) {
+                yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
+
+                if (prev_chunk_id > 0)
+                        yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
+
+                yaffs_verify_file_sane(in);
+        }
+        return new_chunk_id;
+
+}
+
+
+
+static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
+                                const YCHAR * name, const void *value, int size,
+                                int flags)
+{
+        struct yaffs_xattr_mod xmod;
+
+        int result;
+
+        xmod.set = set;
+        xmod.name = name;
+        xmod.data = value;
+        xmod.size = size;
+        xmod.flags = flags;
+        xmod.result = -ENOSPC;
+
+        result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
+
+        if (result > 0)
+                return xmod.result;
+        else
+                return -ENOSPC;
+}
+
+static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
+                                   struct yaffs_xattr_mod *xmod)
+{
+        int retval = 0;
+        int x_offs = sizeof(struct yaffs_obj_hdr);
+        struct yaffs_dev *dev = obj->my_dev;
+        int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+
+        char *x_buffer = buffer + x_offs;
+
+        if (xmod->set)
+                retval =
+                    nval_set(x_buffer, x_size, xmod->name, xmod->data,
+                             xmod->size, xmod->flags);
+        else
+                retval = nval_del(x_buffer, x_size, xmod->name);
+
+        obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+        obj->xattr_known = 1;
+
+        xmod->result = retval;
+
+        return retval;
+}
+
+static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR * name,
+                                  void *value, int size)
+{
+        char *buffer = NULL;
+        int result;
+        struct yaffs_ext_tags tags;
+        struct yaffs_dev *dev = obj->my_dev;
+        int x_offs = sizeof(struct yaffs_obj_hdr);
+        int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+
+        char *x_buffer;
+
+        int retval = 0;
+
+        if (obj->hdr_chunk < 1)
+                return -ENODATA;
+
+        /* If we know that the object has no xattribs then don't do all the
+         * reading and parsing.
+         */
+        if (obj->xattr_known && !obj->has_xattr) {
+                if (name)
+                        return -ENODATA;
+                else
+                        return 0;
+        }
+
+        buffer = (char *)yaffs_get_temp_buffer(dev, __LINE__);
+        if (!buffer)
+                return -ENOMEM;
+
+        result =
+            yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
+
+        if (result != YAFFS_OK)
+                retval = -ENOENT;
+        else {
+                x_buffer = buffer + x_offs;
+
+                if (!obj->xattr_known) {
+                        obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+                        obj->xattr_known = 1;
+                }
+
+                if (name)
+                        retval = nval_get(x_buffer, x_size, name, value, size);
+                else
+                        retval = nval_list(x_buffer, x_size, value, size);
+        }
+        yaffs_release_temp_buffer(dev, (u8 *) buffer, __LINE__);
+        return retval;
+}
+
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
+                      const void *value, int size, int flags)
+{
+        return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
+}
+
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
+{
+        return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
+}
+
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
+                      int size)
+{
+        return yaffs_do_xattrib_fetch(obj, name, value, size);
+}
+
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
+{
+        return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
+}
+
+static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
+{
+        u8 *chunk_data;
+        struct yaffs_obj_hdr *oh;
+        struct yaffs_dev *dev;
+        struct yaffs_ext_tags tags;
+        int result;
+        int alloc_failed = 0;
+
+        if (!in)
+                return;
+
+        dev = in->my_dev;
+
+        if (in->lazy_loaded && in->hdr_chunk > 0) {
+                in->lazy_loaded = 0;
+                chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
+
+                result =
+                    yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunk_data,
+                                             &tags);
+                oh = (struct yaffs_obj_hdr *)chunk_data;
+
+                in->yst_mode = oh->yst_mode;
+                yaffs_load_attribs(in, oh);
+                yaffs_set_obj_name_from_oh(in, oh);
+
+                if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+                        in->variant.symlink_variant.alias =
+                            yaffs_clone_str(oh->alias);
+                        if (!in->variant.symlink_variant.alias)
+                                alloc_failed = 1;       /* Not returned to caller */
+                }
+
+                yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
+        }
+}
+
+static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name,
+                                    const YCHAR * oh_name, int buff_size)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+        if (dev->param.auto_unicode) {
+                if (*oh_name) {
+                        /* It is an ASCII name, do an ASCII to
+                         * unicode conversion */
+                        const char *ascii_oh_name = (const char *)oh_name;
+                        int n = buff_size - 1;
+                        while (n > 0 && *ascii_oh_name) {
+                                *name = *ascii_oh_name;
+                                name++;
+                                ascii_oh_name++;
+                                n--;
+                        }
+                } else {
+                        strncpy(name, oh_name + 1, buff_size - 1);
+                }
+        } else {
+#else
+        {
+#endif
+                strncpy(name, oh_name, buff_size - 1);
+        }
+}
+
+static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name,
+                                    const YCHAR * name)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+
+        int is_ascii;
+        YCHAR *w;
+
+        if (dev->param.auto_unicode) {
+
+                is_ascii = 1;
+                w = name;
+
+                /* Figure out if the name will fit in ascii character set */
+                while (is_ascii && *w) {
+                        if ((*w) & 0xff00)
+                                is_ascii = 0;
+                        w++;
+                }
+
+                if (is_ascii) {
+                        /* It is an ASCII name, so do a unicode to ascii conversion */
+                        char *ascii_oh_name = (char *)oh_name;
+                        int n = YAFFS_MAX_NAME_LENGTH - 1;
+                        while (n > 0 && *name) {
+                                *ascii_oh_name = *name;
+                                name++;
+                                ascii_oh_name++;
+                                n--;
+                        }
+                } else {
+                        /* It is a unicode name, so save starting at the second YCHAR */
+                        *oh_name = 0;
+                        strncpy(oh_name + 1, name,
+                                      YAFFS_MAX_NAME_LENGTH - 2);
+                }
+        } else {
+#else
+        {
+#endif
+                strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
+        }
+
+}
+
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name, int force,
+                    int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
+{
+
+        struct yaffs_block_info *bi;
+
+        struct yaffs_dev *dev = in->my_dev;
+
+        int prev_chunk_id;
+        int ret_val = 0;
+        int result = 0;
+
+        int new_chunk_id;
+        struct yaffs_ext_tags new_tags;
+        struct yaffs_ext_tags old_tags;
+        const YCHAR *alias = NULL;
+
+        u8 *buffer = NULL;
+        YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
+
+        struct yaffs_obj_hdr *oh = NULL;
+
+        strcpy(old_name, _Y("silly old name"));
+
+        if (!in->fake || in == dev->root_dir ||
+            force || xmod) {
+
+                yaffs_check_gc(dev, 0);
+                yaffs_check_obj_details_loaded(in);
+
+                buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__);
+                oh = (struct yaffs_obj_hdr *)buffer;
+
+                prev_chunk_id = in->hdr_chunk;
+
+                if (prev_chunk_id > 0) {
+                        result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
+                                                          buffer, &old_tags);
+
+                        yaffs_verify_oh(in, oh, &old_tags, 0);
+
+                        memcpy(old_name, oh->name, sizeof(oh->name));
+                        memset(buffer, 0xFF, sizeof(struct yaffs_obj_hdr));
+                } else {
+                        memset(buffer, 0xFF, dev->data_bytes_per_chunk);
+                }
+
+                oh->type = in->variant_type;
+                oh->yst_mode = in->yst_mode;
+                oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
+
+                yaffs_load_attribs_oh(oh, in);
+
+                if (in->parent)
+                        oh->parent_obj_id = in->parent->obj_id;
+                else
+                        oh->parent_obj_id = 0;
+
+                if (name && *name) {
+                        memset(oh->name, 0, sizeof(oh->name));
+                        yaffs_load_oh_from_name(dev, oh->name, name);
+                } else if (prev_chunk_id > 0) {
+                        memcpy(oh->name, old_name, sizeof(oh->name));
+                } else {
+                        memset(oh->name, 0, sizeof(oh->name));
+                }
+
+                oh->is_shrink = is_shrink;
+
+                switch (in->variant_type) {
+                case YAFFS_OBJECT_TYPE_UNKNOWN:
+                        /* Should not happen */
+                        break;
+                case YAFFS_OBJECT_TYPE_FILE:
+                        oh->file_size =
+                            (oh->parent_obj_id == YAFFS_OBJECTID_DELETED
+                             || oh->parent_obj_id ==
+                             YAFFS_OBJECTID_UNLINKED) ? 0 : in->
+                            variant.file_variant.file_size;
+                        break;
+                case YAFFS_OBJECT_TYPE_HARDLINK:
+                        oh->equiv_id = in->variant.hardlink_variant.equiv_id;
+                        break;
+                case YAFFS_OBJECT_TYPE_SPECIAL:
+                        /* Do nothing */
+                        break;
+                case YAFFS_OBJECT_TYPE_DIRECTORY:
+                        /* Do nothing */
+                        break;
+                case YAFFS_OBJECT_TYPE_SYMLINK:
+                        alias = in->variant.symlink_variant.alias;
+                        if (!alias)
+                                alias = _Y("no alias");
+                        strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
+                        oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+                        break;
+                }
+
+                /* process any xattrib modifications */
+                if (xmod)
+                        yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
+
+                /* Tags */
+                yaffs_init_tags(&new_tags);
+                in->serial++;
+                new_tags.chunk_id = 0;
+                new_tags.obj_id = in->obj_id;
+                new_tags.serial_number = in->serial;
+
+                /* Add extra info for file header */
+
+                new_tags.extra_available = 1;
+                new_tags.extra_parent_id = oh->parent_obj_id;
+                new_tags.extra_length = oh->file_size;
+                new_tags.extra_is_shrink = oh->is_shrink;
+                new_tags.extra_equiv_id = oh->equiv_id;
+                new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
+                new_tags.extra_obj_type = in->variant_type;
+
+                yaffs_verify_oh(in, oh, &new_tags, 1);
+
+                /* Create new chunk in NAND */
+                new_chunk_id =
+                    yaffs_write_new_chunk(dev, buffer, &new_tags,
+                                          (prev_chunk_id > 0) ? 1 : 0);
+
+                if (new_chunk_id >= 0) {
+
+                        in->hdr_chunk = new_chunk_id;
+
+                        if (prev_chunk_id > 0) {
+                                yaffs_chunk_del(dev, prev_chunk_id, 1,
+                                                __LINE__);
+                        }
+
+                        if (!yaffs_obj_cache_dirty(in))
+                                in->dirty = 0;
+
+                        /* If this was a shrink, then mark the block that the chunk lives on */
+                        if (is_shrink) {
+                                bi = yaffs_get_block_info(in->my_dev,
+                                                          new_chunk_id /
+                                                          in->my_dev->param.
+                                                          chunks_per_block);
+                                bi->has_shrink_hdr = 1;
+                        }
+
+                }
+
+                ret_val = new_chunk_id;
+
+        }
+
+        if (buffer)
+                yaffs_release_temp_buffer(dev, buffer, __LINE__);
+
+        return ret_val;
+}
+
+/*--------------------- File read/write ------------------------
+ * Read and write have very similar structures.
+ * In general the read/write has three parts to it
+ * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+ * Some complete chunks
+ * An incomplete chunk to end off with
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
+
+int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
+{
+
+        int chunk;
+        u32 start;
+        int n_copy;
+        int n = n_bytes;
+        int n_done = 0;
+        struct yaffs_cache *cache;
+
+        struct yaffs_dev *dev;
+
+        dev = in->my_dev;
+
+        while (n > 0) {
+                /* chunk = offset / dev->data_bytes_per_chunk + 1; */
+                /* start = offset % dev->data_bytes_per_chunk; */
+                yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+                chunk++;
+
+                /* OK now check for the curveball where the start and end are in
+                 * the same chunk.
+                 */
+                if ((start + n) < dev->data_bytes_per_chunk)
+                        n_copy = n;
+                else
+                        n_copy = dev->data_bytes_per_chunk - start;
+
+                cache = yaffs_find_chunk_cache(in, chunk);
+
+                /* If the chunk is already in the cache or it is less than a whole chunk
+                 * or we're using inband tags then use the cache (if there is caching)
+                 * else bypass the cache.
+                 */
+                if (cache || n_copy != dev->data_bytes_per_chunk
+                    || dev->param.inband_tags) {
+                        if (dev->param.n_caches > 0) {
+
+                                /* If we can't find the data in the cache, then load it up. */
+
+                                if (!cache) {
+                                        cache =
+                                            yaffs_grab_chunk_cache(in->my_dev);
+                                        cache->object = in;
+                                        cache->chunk_id = chunk;
+                                        cache->dirty = 0;
+                                        cache->locked = 0;
+                                        yaffs_rd_data_obj(in, chunk,
+                                                          cache->data);
+                                        cache->n_bytes = 0;
+                                }
+
+                                yaffs_use_cache(dev, cache, 0);
+
+                                cache->locked = 1;
+
+                                memcpy(buffer, &cache->data[start], n_copy);
+
+                                cache->locked = 0;
+                        } else {
+                                /* Read into the local buffer then copy.. */
+
+                                u8 *local_buffer =
+                                    yaffs_get_temp_buffer(dev, __LINE__);
+                                yaffs_rd_data_obj(in, chunk, local_buffer);
+
+                                memcpy(buffer, &local_buffer[start], n_copy);
+
+                                yaffs_release_temp_buffer(dev, local_buffer,
+                                                          __LINE__);
+                        }
+
+                } else {
+
+                        /* A full chunk. Read directly into the supplied buffer. */
+                        yaffs_rd_data_obj(in, chunk, buffer);
+
+                }
+
+                n -= n_copy;
+                offset += n_copy;
+                buffer += n_copy;
+                n_done += n_copy;
+
+        }
+
+        return n_done;
+}
+
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
+                     int n_bytes, int write_trhrough)
+{
+
+        int chunk;
+        u32 start;
+        int n_copy;
+        int n = n_bytes;
+        int n_done = 0;
+        int n_writeback;
+        int start_write = offset;
+        int chunk_written = 0;
+        u32 n_bytes_read;
+        u32 chunk_start;
+
+        struct yaffs_dev *dev;
+
+        dev = in->my_dev;
+
+        while (n > 0 && chunk_written >= 0) {
+                yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+
+                if (chunk * dev->data_bytes_per_chunk + start != offset ||
+                    start >= dev->data_bytes_per_chunk) {
+                        yaffs_trace(YAFFS_TRACE_ERROR,
+                                "AddrToChunk of offset %d gives chunk %d start %d",
+                                (int)offset, chunk, start);
+                }
+                chunk++;        /* File pos to chunk in file offset */
+
+                /* OK now check for the curveball where the start and end are in
+                 * the same chunk.
+                 */
+
+                if ((start + n) < dev->data_bytes_per_chunk) {
+                        n_copy = n;
+
+                        /* Now folks, to calculate how many bytes to write back....
+                         * If we're overwriting and not writing to then end of file then
+                         * we need to write back as much as was there before.
+                         */
+
+                        chunk_start = ((chunk - 1) * dev->data_bytes_per_chunk);
+
+                        if (chunk_start > in->variant.file_variant.file_size)
+                                n_bytes_read = 0;       /* Past end of file */
+                        else
+                                n_bytes_read =
+                                    in->variant.file_variant.file_size -
+                                    chunk_start;
+
+                        if (n_bytes_read > dev->data_bytes_per_chunk)
+                                n_bytes_read = dev->data_bytes_per_chunk;
+
+                        n_writeback =
+                            (n_bytes_read >
+                             (start + n)) ? n_bytes_read : (start + n);
+
+                        if (n_writeback < 0
+                            || n_writeback > dev->data_bytes_per_chunk)
+                                YBUG();
+
+                } else {
+                        n_copy = dev->data_bytes_per_chunk - start;
+                        n_writeback = dev->data_bytes_per_chunk;
+                }
+
+                if (n_copy != dev->data_bytes_per_chunk
+                    || dev->param.inband_tags) {
+                        /* An incomplete start or end chunk (or maybe both start and end chunk),
+                         * or we're using inband tags, so we want to use the cache buffers.
+                         */
+                        if (dev->param.n_caches > 0) {
+                                struct yaffs_cache *cache;
+                                /* If we can't find the data in the cache, then load the cache */
+                                cache = yaffs_find_chunk_cache(in, chunk);
+
+                                if (!cache
+                                    && yaffs_check_alloc_available(dev, 1)) {
+                                        cache = yaffs_grab_chunk_cache(dev);
+                                        cache->object = in;
+                                        cache->chunk_id = chunk;
+                                        cache->dirty = 0;
+                                        cache->locked = 0;
+                                        yaffs_rd_data_obj(in, chunk,
+                                                          cache->data);
+                                } else if (cache &&
+                                           !cache->dirty &&
+                                           !yaffs_check_alloc_available(dev,
+                                                                        1)) {
+                                        /* Drop the cache if it was a read cache item and
+                                         * no space check has been made for it.
+                                         */
+                                        cache = NULL;
+                                }
+
+                                if (cache) {
+                                        yaffs_use_cache(dev, cache, 1);
+                                        cache->locked = 1;
+
+                                        memcpy(&cache->data[start], buffer,
+                                               n_copy);
+
+                                        cache->locked = 0;
+                                        cache->n_bytes = n_writeback;
+
+                                        if (write_trhrough) {
+                                                chunk_written =
+                                                    yaffs_wr_data_obj
+                                                    (cache->object,
+                                                     cache->chunk_id,
+                                                     cache->data,
+                                                     cache->n_bytes, 1);
+                                                cache->dirty = 0;
+                                        }
+
+                                } else {
+                                        chunk_written = -1;     /* fail the write */
+                                }
+                        } else {
+                                /* An incomplete start or end chunk (or maybe both start and end chunk)
+                                 * Read into the local buffer then copy, then copy over and write back.
+                                 */
+
+                                u8 *local_buffer =
+                                    yaffs_get_temp_buffer(dev, __LINE__);
+
+                                yaffs_rd_data_obj(in, chunk, local_buffer);
+
+                                memcpy(&local_buffer[start], buffer, n_copy);
+
+                                chunk_written =
+                                    yaffs_wr_data_obj(in, chunk,
+                                                      local_buffer,
+                                                      n_writeback, 0);
+
+                                yaffs_release_temp_buffer(dev, local_buffer,
+                                                          __LINE__);
+
+                        }
+
+                } else {
+                        /* A full chunk. Write directly from the supplied buffer. */
+
+                        chunk_written =
+                            yaffs_wr_data_obj(in, chunk, buffer,
+                                              dev->data_bytes_per_chunk, 0);
+
+                        /* Since we've overwritten the cached data, we better invalidate it. */
+                        yaffs_invalidate_chunk_cache(in, chunk);
+                }
+
+                if (chunk_written >= 0) {
+                        n -= n_copy;
+                        offset += n_copy;
+                        buffer += n_copy;
+                        n_done += n_copy;
+                }
+
+        }
+
+        /* Update file object */
+
+        if ((start_write + n_done) > in->variant.file_variant.file_size)
+                in->variant.file_variant.file_size = (start_write + n_done);
+
+        in->dirty = 1;
+
+        return n_done;
+}
+
+int yaffs_wr_file(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
+                  int n_bytes, int write_trhrough)
+{
+        yaffs2_handle_hole(in, offset);
+        return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_trhrough);
+}
+
+/* ---------------------- File resizing stuff ------------------ */
+
+static void yaffs_prune_chunks(struct yaffs_obj *in, int new_size)
+{
+
+        struct yaffs_dev *dev = in->my_dev;
+        int old_size = in->variant.file_variant.file_size;
+
+        int last_del = 1 + (old_size - 1) / dev->data_bytes_per_chunk;
+
+        int start_del = 1 + (new_size + dev->data_bytes_per_chunk - 1) /
+            dev->data_bytes_per_chunk;
+        int i;
+        int chunk_id;
+
+        /* Delete backwards so that we don't end up with holes if
+         * power is lost part-way through the operation.
+         */
+        for (i = last_del; i >= start_del; i--) {
+                /* NB this could be optimised somewhat,
+                 * eg. could retrieve the tags and write them without
+                 * using yaffs_chunk_del
+                 */
+
+                chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
+                if (chunk_id > 0) {
+                        if (chunk_id <
+                            (dev->internal_start_block *
+                             dev->param.chunks_per_block)
+                            || chunk_id >=
+                            ((dev->internal_end_block +
+                              1) * dev->param.chunks_per_block)) {
+                                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                        "Found daft chunk_id %d for %d",
+                                        chunk_id, i);
+                        } else {
+                                in->n_data_chunks--;
+                                yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
+                        }
+                }
+        }
+
+}
+
+void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
+{
+        int new_full;
+        u32 new_partial;
+        struct yaffs_dev *dev = obj->my_dev;
+
+        yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
+
+        yaffs_prune_chunks(obj, new_size);
+
+        if (new_partial != 0) {
+                int last_chunk = 1 + new_full;
+                u8 *local_buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+                /* Rewrite the last chunk with its new size and zero pad */
+                yaffs_rd_data_obj(obj, last_chunk, local_buffer);
+                memset(local_buffer + new_partial, 0,
+                       dev->data_bytes_per_chunk - new_partial);
+
+                yaffs_wr_data_obj(obj, last_chunk, local_buffer,
+                                  new_partial, 1);
+
+                yaffs_release_temp_buffer(dev, local_buffer, __LINE__);
+        }
+
+        obj->variant.file_variant.file_size = new_size;
+
+        yaffs_prune_tree(dev, &obj->variant.file_variant);
+}
+
+int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
+{
+        struct yaffs_dev *dev = in->my_dev;
+        int old_size = in->variant.file_variant.file_size;
+
+        yaffs_flush_file_cache(in);
+        yaffs_invalidate_whole_cache(in);
+
+        yaffs_check_gc(dev, 0);
+
+        if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
+                return YAFFS_FAIL;
+
+        if (new_size == old_size)
+                return YAFFS_OK;
+
+        if (new_size > old_size) {
+                yaffs2_handle_hole(in, new_size);
+                in->variant.file_variant.file_size = new_size;
+        } else {
+                /* new_size < old_size */
+                yaffs_resize_file_down(in, new_size);
+        }
+
+        /* Write a new object header to reflect the resize.
+         * show we've shrunk the file, if need be
+         * Do this only if the file is not in the deleted directories
+         * and is not shadowed.
+         */
+        if (in->parent &&
+            !in->is_shadowed &&
+            in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+            in->parent->obj_id != YAFFS_OBJECTID_DELETED)
+                yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
+
+        return YAFFS_OK;
+}
+
+int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
+{
+        int ret_val;
+        if (in->dirty) {
+                yaffs_flush_file_cache(in);
+                if (data_sync)  /* Only sync data */
+                        ret_val = YAFFS_OK;
+                else {
+                        if (update_time)
+                                yaffs_load_current_time(in, 0, 0);
+
+                        ret_val = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >=
+                                   0) ? YAFFS_OK : YAFFS_FAIL;
+                }
+        } else {
+                ret_val = YAFFS_OK;
+        }
+
+        return ret_val;
+
+}
+
+
+/* yaffs_del_file deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
+{
+
+        int ret_val;
+        int del_now = 0;
+        struct yaffs_dev *dev = in->my_dev;
+
+        if (!in->my_inode)
+                del_now = 1;
+
+        if (del_now) {
+                ret_val =
+                    yaffs_change_obj_name(in, in->my_dev->del_dir,
+                                          _Y("deleted"), 0, 0);
+                yaffs_trace(YAFFS_TRACE_TRACING,
+                        "yaffs: immediate deletion of file %d",
+                        in->obj_id);
+                in->deleted = 1;
+                in->my_dev->n_deleted_files++;
+                if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+                        yaffs_resize_file(in, 0);
+                yaffs_soft_del_file(in);
+        } else {
+                ret_val =
+                    yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
+                                          _Y("unlinked"), 0, 0);
+        }
+
+        return ret_val;
+}
+
+int yaffs_del_file(struct yaffs_obj *in)
+{
+        int ret_val = YAFFS_OK;
+        int deleted;            /* Need to cache value on stack if in is freed */
+        struct yaffs_dev *dev = in->my_dev;
+
+        if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+                yaffs_resize_file(in, 0);
+
+        if (in->n_data_chunks > 0) {
+                /* Use soft deletion if there is data in the file.
+                 * That won't be the case if it has been resized to zero.
+                 */
+                if (!in->unlinked)
+                        ret_val = yaffs_unlink_file_if_needed(in);
+
+                deleted = in->deleted;
+
+                if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
+                        in->deleted = 1;
+                        deleted = 1;
+                        in->my_dev->n_deleted_files++;
+                        yaffs_soft_del_file(in);
+                }
+                return deleted ? YAFFS_OK : YAFFS_FAIL;
+        } else {
+                /* The file has no data chunks so we toss it immediately */
+                yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
+                in->variant.file_variant.top = NULL;
+                yaffs_generic_obj_del(in);
+
+                return YAFFS_OK;
+        }
+}
+
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
+{
+        return (obj &&
+                obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+                !(list_empty(&obj->variant.dir_variant.children));
+}
+
+static int yaffs_del_dir(struct yaffs_obj *obj)
+{
+        /* First check that the directory is empty. */
+        if (yaffs_is_non_empty_dir(obj))
+                return YAFFS_FAIL;
+
+        return yaffs_generic_obj_del(obj);
+}
+
+static int yaffs_del_symlink(struct yaffs_obj *in)
+{
+        if (in->variant.symlink_variant.alias)
+                kfree(in->variant.symlink_variant.alias);
+        in->variant.symlink_variant.alias = NULL;
+
+        return yaffs_generic_obj_del(in);
+}
+
+static int yaffs_del_link(struct yaffs_obj *in)
+{
+        /* remove this hardlink from the list assocaited with the equivalent
+         * object
+         */
+        list_del_init(&in->hard_links);
+        return yaffs_generic_obj_del(in);
+}
+
+int yaffs_del_obj(struct yaffs_obj *obj)
+{
+        int ret_val = -1;
+        switch (obj->variant_type) {
+        case YAFFS_OBJECT_TYPE_FILE:
+                ret_val = yaffs_del_file(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_DIRECTORY:
+                if (!list_empty(&obj->variant.dir_variant.dirty)) {
+                        yaffs_trace(YAFFS_TRACE_BACKGROUND,
+                                "Remove object %d from dirty directories",
+                                obj->obj_id);
+                        list_del_init(&obj->variant.dir_variant.dirty);
+                }
+                return yaffs_del_dir(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_SYMLINK:
+                ret_val = yaffs_del_symlink(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_HARDLINK:
+                ret_val = yaffs_del_link(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_SPECIAL:
+                ret_val = yaffs_generic_obj_del(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_UNKNOWN:
+                ret_val = 0;
+                break;          /* should not happen. */
+        }
+
+        return ret_val;
+}
+
+static int yaffs_unlink_worker(struct yaffs_obj *obj)
+{
+
+        int del_now = 0;
+
+        if (!obj->my_inode)
+                del_now = 1;
+
+        if (obj)
+                yaffs_update_parent(obj->parent);
+
+        if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+                return yaffs_del_link(obj);
+        } else if (!list_empty(&obj->hard_links)) {
+                /* Curve ball: We're unlinking an object that has a hardlink.
+                 *
+                 * This problem arises because we are not strictly following
+                 * The Linux link/inode model.
+                 *
+                 * We can't really delete the object.
+                 * Instead, we do the following:
+                 * - Select a hardlink.
+                 * - Unhook it from the hard links
+                 * - Move it from its parent directory (so that the rename can work)
+                 * - Rename the object to the hardlink's name.
+                 * - Delete the hardlink
+                 */
+
+                struct yaffs_obj *hl;
+                struct yaffs_obj *parent;
+                int ret_val;
+                YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+                hl = list_entry(obj->hard_links.next, struct yaffs_obj,
+                                hard_links);
+
+                yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+                parent = hl->parent;
+
+                list_del_init(&hl->hard_links);
+
+                yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
+
+                ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
+
+                if (ret_val == YAFFS_OK)
+                        ret_val = yaffs_generic_obj_del(hl);
+
+                return ret_val;
+
+        } else if (del_now) {
+                switch (obj->variant_type) {
+                case YAFFS_OBJECT_TYPE_FILE:
+                        return yaffs_del_file(obj);
+                        break;
+                case YAFFS_OBJECT_TYPE_DIRECTORY:
+                        list_del_init(&obj->variant.dir_variant.dirty);
+                        return yaffs_del_dir(obj);
+                        break;
+                case YAFFS_OBJECT_TYPE_SYMLINK:
+                        return yaffs_del_symlink(obj);
+                        break;
+                case YAFFS_OBJECT_TYPE_SPECIAL:
+                        return yaffs_generic_obj_del(obj);
+                        break;
+                case YAFFS_OBJECT_TYPE_HARDLINK:
+                case YAFFS_OBJECT_TYPE_UNKNOWN:
+                default:
+                        return YAFFS_FAIL;
+                }
+        } else if (yaffs_is_non_empty_dir(obj)) {
+                return YAFFS_FAIL;
+        } else {
+                return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
+                                             _Y("unlinked"), 0, 0);
+        }
+}
+
+static int yaffs_unlink_obj(struct yaffs_obj *obj)
+{
+
+        if (obj && obj->unlink_allowed)
+                return yaffs_unlink_worker(obj);
+
+        return YAFFS_FAIL;
+
+}
+
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name)
+{
+        struct yaffs_obj *obj;
+
+        obj = yaffs_find_by_name(dir, name);
+        return yaffs_unlink_obj(obj);
+}
+
+/* Note:
+ * If old_name is NULL then we take old_dir as the object to be renamed.
+ */
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
+                     struct yaffs_obj *new_dir, const YCHAR * new_name)
+{
+        struct yaffs_obj *obj = NULL;
+        struct yaffs_obj *existing_target = NULL;
+        int force = 0;
+        int result;
+        struct yaffs_dev *dev;
+
+        if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+                YBUG();
+        if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+                YBUG();
+
+        dev = old_dir->my_dev;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+        /* Special case for case insemsitive systems.
+         * While look-up is case insensitive, the name isn't.
+         * Therefore we might want to change x.txt to X.txt
+         */
+        if (old_dir == new_dir && 
+                old_name && new_name && 
+                strcmp(old_name, new_name) == 0)
+                force = 1;
+#endif
+
+        if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
+            YAFFS_MAX_NAME_LENGTH)
+                /* ENAMETOOLONG */
+                return YAFFS_FAIL;
+
+        if(old_name)
+                obj = yaffs_find_by_name(old_dir, old_name);
+        else{
+                obj = old_dir;
+                old_dir = obj->parent;
+        }
+
+
+        if (obj && obj->rename_allowed) {
+
+                /* Now do the handling for an existing target, if there is one */
+
+                existing_target = yaffs_find_by_name(new_dir, new_name);
+                if (yaffs_is_non_empty_dir(existing_target)){
+                        return YAFFS_FAIL;      /* ENOTEMPTY */
+                } else if (existing_target && existing_target != obj) {
+                        /* Nuke the target first, using shadowing,
+                         * but only if it isn't the same object.
+                         *
+                         * Note we must disable gc otherwise it can mess up the shadowing.
+                         *
+                         */
+                        dev->gc_disable = 1;
+                        yaffs_change_obj_name(obj, new_dir, new_name, force,
+                                              existing_target->obj_id);
+                        existing_target->is_shadowed = 1;
+                        yaffs_unlink_obj(existing_target);
+                        dev->gc_disable = 0;
+                }
+
+                result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
+
+                yaffs_update_parent(old_dir);
+                if (new_dir != old_dir)
+                        yaffs_update_parent(new_dir);
+
+                return result;
+        }
+        return YAFFS_FAIL;
+}
+
+/*----------------------- Initialisation Scanning ---------------------- */
+
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+                               int backward_scanning)
+{
+        struct yaffs_obj *obj;
+
+        if (!backward_scanning) {
+                /* Handle YAFFS1 forward scanning case
+                 * For YAFFS1 we always do the deletion
+                 */
+
+        } else {
+                /* Handle YAFFS2 case (backward scanning)
+                 * If the shadowed object exists then ignore.
+                 */
+                obj = yaffs_find_by_number(dev, obj_id);
+                if (obj)
+                        return;
+        }
+
+        /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
+         * We put it in unlinked dir to be cleaned up after the scanning
+         */
+        obj =
+            yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
+        if (!obj)
+                return;
+        obj->is_shadowed = 1;
+        yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
+        obj->variant.file_variant.shrink_size = 0;
+        obj->valid = 1;         /* So that we don't read any other info for this file */
+
+}
+
+void yaffs_link_fixup(struct yaffs_dev *dev, struct yaffs_obj *hard_list)
+{
+        struct yaffs_obj *hl;
+        struct yaffs_obj *in;
+
+        while (hard_list) {
+                hl = hard_list;
+                hard_list = (struct yaffs_obj *)(hard_list->hard_links.next);
+
+                in = yaffs_find_by_number(dev,
+                                          hl->variant.
+                                          hardlink_variant.equiv_id);
+
+                if (in) {
+                        /* Add the hardlink pointers */
+                        hl->variant.hardlink_variant.equiv_obj = in;
+                        list_add(&hl->hard_links, &in->hard_links);
+                } else {
+                        /* Todo Need to report/handle this better.
+                         * Got a problem... hardlink to a non-existant object
+                         */
+                        hl->variant.hardlink_variant.equiv_obj = NULL;
+                        INIT_LIST_HEAD(&hl->hard_links);
+
+                }
+        }
+}
+
+static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
+{
+        /*
+         *  Sort out state of unlinked and deleted objects after scanning.
+         */
+        struct list_head *i;
+        struct list_head *n;
+        struct yaffs_obj *l;
+
+        if (dev->read_only)
+                return;
+
+        /* Soft delete all the unlinked files */
+        list_for_each_safe(i, n,
+                           &dev->unlinked_dir->variant.dir_variant.children) {
+                if (i) {
+                        l = list_entry(i, struct yaffs_obj, siblings);
+                        yaffs_del_obj(l);
+                }
+        }
+
+        list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
+                if (i) {
+                        l = list_entry(i, struct yaffs_obj, siblings);
+                        yaffs_del_obj(l);
+                }
+        }
+
+}
+
+/*
+ * This code iterates through all the objects making sure that they are rooted.
+ * Any unrooted objects are re-rooted in lost+found.
+ * An object needs to be in one of:
+ * - Directly under deleted, unlinked
+ * - Directly or indirectly under root.
+ *
+ * Note:
+ *  This code assumes that we don't ever change the current relationships between
+ *  directories:
+ *   root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
+ *   lost-n-found->parent == root_dir
+ *
+ * This fixes the problem where directories might have inadvertently been deleted
+ * leaving the object "hanging" without being rooted in the directory tree.
+ */
+
+static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+        return (obj == dev->del_dir ||
+                obj == dev->unlinked_dir || obj == dev->root_dir);
+}
+
+static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
+{
+        struct yaffs_obj *obj;
+        struct yaffs_obj *parent;
+        int i;
+        struct list_head *lh;
+        struct list_head *n;
+        int depth_limit;
+        int hanging;
+
+        if (dev->read_only)
+                return;
+
+        /* Iterate through the objects in each hash entry,
+         * looking at each object.
+         * Make sure it is rooted.
+         */
+
+        for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+                list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
+                        if (lh) {
+                                obj =
+                                    list_entry(lh, struct yaffs_obj, hash_link);
+                                parent = obj->parent;
+
+                                if (yaffs_has_null_parent(dev, obj)) {
+                                        /* These directories are not hanging */
+                                        hanging = 0;
+                                } else if (!parent
+                                           || parent->variant_type !=
+                                           YAFFS_OBJECT_TYPE_DIRECTORY) {
+                                        hanging = 1;
+                                } else if (yaffs_has_null_parent(dev, parent)) {
+                                        hanging = 0;
+                                } else {
+                                        /*
+                                         * Need to follow the parent chain to see if it is hanging.
+                                         */
+                                        hanging = 0;
+                                        depth_limit = 100;
+
+                                        while (parent != dev->root_dir &&
+                                               parent->parent &&
+                                               parent->parent->variant_type ==
+                                               YAFFS_OBJECT_TYPE_DIRECTORY
+                                               && depth_limit > 0) {
+                                                parent = parent->parent;
+                                                depth_limit--;
+                                        }
+                                        if (parent != dev->root_dir)
+                                                hanging = 1;
+                                }
+                                if (hanging) {
+                                        yaffs_trace(YAFFS_TRACE_SCAN,
+                                                "Hanging object %d moved to lost and found",
+                                                obj->obj_id);
+                                        yaffs_add_obj_to_dir(dev->lost_n_found,
+                                                             obj);
+                                }
+                        }
+                }
+        }
+}
+
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_del_dir_contents(struct yaffs_obj *dir)
+{
+        struct yaffs_obj *obj;
+        struct list_head *lh;
+        struct list_head *n;
+
+        if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+                YBUG();
+
+        list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
+                if (lh) {
+                        obj = list_entry(lh, struct yaffs_obj, siblings);
+                        if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+                                yaffs_del_dir_contents(obj);
+
+                        yaffs_trace(YAFFS_TRACE_SCAN,
+                                "Deleting lost_found object %d",
+                                obj->obj_id);
+
+                        /* Need to use UnlinkObject since Delete would not handle
+                         * hardlinked objects correctly.
+                         */
+                        yaffs_unlink_obj(obj);
+                }
+        }
+
+}
+
+static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
+{
+        yaffs_del_dir_contents(dev->lost_n_found);
+}
+
+
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
+                                     const YCHAR * name)
+{
+        int sum;
+
+        struct list_head *i;
+        YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
+
+        struct yaffs_obj *l;
+
+        if (!name)
+                return NULL;
+
+        if (!directory) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "tragedy: yaffs_find_by_name: null pointer directory"
+                        );
+                YBUG();
+                return NULL;
+        }
+        if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "tragedy: yaffs_find_by_name: non-directory"
+                        );
+                YBUG();
+        }
+
+        sum = yaffs_calc_name_sum(name);
+
+        list_for_each(i, &directory->variant.dir_variant.children) {
+                if (i) {
+                        l = list_entry(i, struct yaffs_obj, siblings);
+
+                        if (l->parent != directory)
+                                YBUG();
+
+                        yaffs_check_obj_details_loaded(l);
+
+                        /* Special case for lost-n-found */
+                        if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+                                if (!strcmp(name, YAFFS_LOSTNFOUND_NAME))
+                                        return l;
+                        } else if (l->sum == sum
+                                   || l->hdr_chunk <= 0) {
+                                /* LostnFound chunk called Objxxx
+                                 * Do a real check
+                                 */
+                                yaffs_get_obj_name(l, buffer,
+                                                   YAFFS_MAX_NAME_LENGTH + 1);
+                                if (strncmp
+                                    (name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
+                                        return l;
+                        }
+                }
+        }
+
+        return NULL;
+}
+
+/* GetEquivalentObject dereferences any hard links to get to the
+ * actual object.
+ */
+
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
+{
+        if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+                /* We want the object id of the equivalent object, not this one */
+                obj = obj->variant.hardlink_variant.equiv_obj;
+                yaffs_check_obj_details_loaded(obj);
+        }
+        return obj;
+}
+
+/*
+ *  A note or two on object names.
+ *  * If the object name is missing, we then make one up in the form objnnn
+ *
+ *  * ASCII names are stored in the object header's name field from byte zero
+ *  * Unicode names are historically stored starting from byte zero.
+ *
+ * Then there are automatic Unicode names...
+ * The purpose of these is to save names in a way that can be read as
+ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
+ * system to share files.
+ *
+ * These automatic unicode are stored slightly differently...
+ *  - If the name can fit in the ASCII character space then they are saved as 
+ *    ascii names as per above.
+ *  - If the name needs Unicode then the name is saved in Unicode
+ *    starting at oh->name[1].
+
+ */
+static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR * name,
+                                int buffer_size)
+{
+        /* Create an object name if we could not find one. */
+        if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
+                YCHAR local_name[20];
+                YCHAR num_string[20];
+                YCHAR *x = &num_string[19];
+                unsigned v = obj->obj_id;
+                num_string[19] = 0;
+                while (v > 0) {
+                        x--;
+                        *x = '0' + (v % 10);
+                        v /= 10;
+                }
+                /* make up a name */
+                strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
+                strcat(local_name, x);
+                strncpy(name, local_name, buffer_size - 1);
+        }
+}
+
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size)
+{
+        memset(name, 0, buffer_size * sizeof(YCHAR));
+
+        yaffs_check_obj_details_loaded(obj);
+
+        if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+                strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
+        }
+#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
+        else if (obj->short_name[0]) {
+                strcpy(name, obj->short_name);
+        }
+#endif
+        else if (obj->hdr_chunk > 0) {
+                int result;
+                u8 *buffer = yaffs_get_temp_buffer(obj->my_dev, __LINE__);
+
+                struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
+
+                memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
+
+                if (obj->hdr_chunk > 0) {
+                        result = yaffs_rd_chunk_tags_nand(obj->my_dev,
+                                                          obj->hdr_chunk,
+                                                          buffer, NULL);
+                }
+                yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
+                                        buffer_size);
+
+                yaffs_release_temp_buffer(obj->my_dev, buffer, __LINE__);
+        }
+
+        yaffs_fix_null_name(obj, name, buffer_size);
+
+        return strnlen(name, YAFFS_MAX_NAME_LENGTH);
+}
+
+int yaffs_get_obj_length(struct yaffs_obj *obj)
+{
+        /* Dereference any hard linking */
+        obj = yaffs_get_equivalent_obj(obj);
+
+        if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+                return obj->variant.file_variant.file_size;
+        if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+                if (!obj->variant.symlink_variant.alias)
+                        return 0;
+                return strnlen(obj->variant.symlink_variant.alias,
+                                     YAFFS_MAX_ALIAS_LENGTH);
+        } else {
+                /* Only a directory should drop through to here */
+                return obj->my_dev->data_bytes_per_chunk;
+        }
+}
+
+int yaffs_get_obj_link_count(struct yaffs_obj *obj)
+{
+        int count = 0;
+        struct list_head *i;
+
+        if (!obj->unlinked)
+                count++;        /* the object itself */
+
+        list_for_each(i, &obj->hard_links)
+            count++;            /* add the hard links; */
+
+        return count;
+}
+
+int yaffs_get_obj_inode(struct yaffs_obj *obj)
+{
+        obj = yaffs_get_equivalent_obj(obj);
+
+        return obj->obj_id;
+}
+
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
+{
+        obj = yaffs_get_equivalent_obj(obj);
+
+        switch (obj->variant_type) {
+        case YAFFS_OBJECT_TYPE_FILE:
+                return DT_REG;
+                break;
+        case YAFFS_OBJECT_TYPE_DIRECTORY:
+                return DT_DIR;
+                break;
+        case YAFFS_OBJECT_TYPE_SYMLINK:
+                return DT_LNK;
+                break;
+        case YAFFS_OBJECT_TYPE_HARDLINK:
+                return DT_REG;
+                break;
+        case YAFFS_OBJECT_TYPE_SPECIAL:
+                if (S_ISFIFO(obj->yst_mode))
+                        return DT_FIFO;
+                if (S_ISCHR(obj->yst_mode))
+                        return DT_CHR;
+                if (S_ISBLK(obj->yst_mode))
+                        return DT_BLK;
+                if (S_ISSOCK(obj->yst_mode))
+                        return DT_SOCK;
+        default:
+                return DT_REG;
+                break;
+        }
+}
+
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
+{
+        obj = yaffs_get_equivalent_obj(obj);
+        if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
+                return yaffs_clone_str(obj->variant.symlink_variant.alias);
+        else
+                return yaffs_clone_str(_Y(""));
+}
+
+/*--------------------------- Initialisation code -------------------------- */
+
+static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
+{
+
+        /* Common functions, gotta have */
+        if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
+                return 0;
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+        /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
+        if (dev->param.write_chunk_tags_fn &&
+            dev->param.read_chunk_tags_fn &&
+            !dev->param.write_chunk_fn &&
+            !dev->param.read_chunk_fn &&
+            dev->param.bad_block_fn && dev->param.query_block_fn)
+                return 1;
+#endif
+
+        /* Can use the "spare" style interface for yaffs1 */
+        if (!dev->param.is_yaffs2 &&
+            !dev->param.write_chunk_tags_fn &&
+            !dev->param.read_chunk_tags_fn &&
+            dev->param.write_chunk_fn &&
+            dev->param.read_chunk_fn &&
+            !dev->param.bad_block_fn && !dev->param.query_block_fn)
+                return 1;
+
+        return 0;               /* bad */
+}
+
+static int yaffs_create_initial_dir(struct yaffs_dev *dev)
+{
+        /* Initialise the unlinked, deleted, root and lost and found directories */
+
+        dev->lost_n_found = dev->root_dir = NULL;
+        dev->unlinked_dir = dev->del_dir = NULL;
+
+        dev->unlinked_dir =
+            yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+
+        dev->del_dir =
+            yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
+
+        dev->root_dir =
+            yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
+                                  YAFFS_ROOT_MODE | S_IFDIR);
+        dev->lost_n_found =
+            yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
+                                  YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+
+        if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
+            && dev->del_dir) {
+                yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
+                return YAFFS_OK;
+        }
+
+        return YAFFS_FAIL;
+}
+
+int yaffs_guts_initialise(struct yaffs_dev *dev)
+{
+        int init_failed = 0;
+        unsigned x;
+        int bits;
+
+        yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()" );
+
+        /* Check stuff that must be set */
+
+        if (!dev) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "yaffs: Need a device"
+                        );
+                return YAFFS_FAIL;
+        }
+
+        dev->internal_start_block = dev->param.start_block;
+        dev->internal_end_block = dev->param.end_block;
+        dev->block_offset = 0;
+        dev->chunk_offset = 0;
+        dev->n_free_chunks = 0;
+
+        dev->gc_block = 0;
+
+        if (dev->param.start_block == 0) {
+                dev->internal_start_block = dev->param.start_block + 1;
+                dev->internal_end_block = dev->param.end_block + 1;
+                dev->block_offset = 1;
+                dev->chunk_offset = dev->param.chunks_per_block;
+        }
+
+        /* Check geometry parameters. */
+
+        if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
+                dev->param.total_bytes_per_chunk < 1024) ||
+                (!dev->param.is_yaffs2 &&
+                        dev->param.total_bytes_per_chunk < 512) ||
+                (dev->param.inband_tags && !dev->param.is_yaffs2) ||
+                 dev->param.chunks_per_block < 2 ||
+                 dev->param.n_reserved_blocks < 2 ||
+                dev->internal_start_block <= 0 || 
+                dev->internal_end_block <= 0 || 
+                dev->internal_end_block <= 
+                (dev->internal_start_block + dev->param.n_reserved_blocks + 2)
+                ) {
+                /* otherwise it is too small */
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
+                        dev->param.total_bytes_per_chunk,
+                        dev->param.is_yaffs2 ? "2" : "",
+                        dev->param.inband_tags);
+                return YAFFS_FAIL;
+        }
+
+        if (yaffs_init_nand(dev) != YAFFS_OK) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
+                return YAFFS_FAIL;
+        }
+
+        /* Sort out space for inband tags, if required */
+        if (dev->param.inband_tags)
+                dev->data_bytes_per_chunk =
+                    dev->param.total_bytes_per_chunk -
+                    sizeof(struct yaffs_packed_tags2_tags_only);
+        else
+                dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
+
+        /* Got the right mix of functions? */
+        if (!yaffs_check_dev_fns(dev)) {
+                /* Function missing */
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "device function(s) missing or wrong");
+
+                return YAFFS_FAIL;
+        }
+
+        if (dev->is_mounted) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
+                return YAFFS_FAIL;
+        }
+
+        /* Finished with most checks. One or two more checks happen later on too. */
+
+        dev->is_mounted = 1;
+
+        /* OK now calculate a few things for the device */
+
+        /*
+         *  Calculate all the chunk size manipulation numbers:
+         */
+        x = dev->data_bytes_per_chunk;
+        /* We always use dev->chunk_shift and dev->chunk_div */
+        dev->chunk_shift = calc_shifts(x);
+        x >>= dev->chunk_shift;
+        dev->chunk_div = x;
+        /* We only use chunk mask if chunk_div is 1 */
+        dev->chunk_mask = (1 << dev->chunk_shift) - 1;
+
+        /*
+         * Calculate chunk_grp_bits.
+         * We need to find the next power of 2 > than internal_end_block
+         */
+
+        x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
+
+        bits = calc_shifts_ceiling(x);
+
+        /* Set up tnode width if wide tnodes are enabled. */
+        if (!dev->param.wide_tnodes_disabled) {
+                /* bits must be even so that we end up with 32-bit words */
+                if (bits & 1)
+                        bits++;
+                if (bits < 16)
+                        dev->tnode_width = 16;
+                else
+                        dev->tnode_width = bits;
+        } else {
+                dev->tnode_width = 16;
+        }
+
+        dev->tnode_mask = (1 << dev->tnode_width) - 1;
+
+        /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
+         * so if the bitwidth of the
+         * chunk range we're using is greater than 16 we need
+         * to figure out chunk shift and chunk_grp_size
+         */
+
+        if (bits <= dev->tnode_width)
+                dev->chunk_grp_bits = 0;
+        else
+                dev->chunk_grp_bits = bits - dev->tnode_width;
+
+        dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
+        if (dev->tnode_size < sizeof(struct yaffs_tnode))
+                dev->tnode_size = sizeof(struct yaffs_tnode);
+
+        dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
+
+        if (dev->param.chunks_per_block < dev->chunk_grp_size) {
+                /* We have a problem because the soft delete won't work if
+                 * the chunk group size > chunks per block.
+                 * This can be remedied by using larger "virtual blocks".
+                 */
+                yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
+
+                return YAFFS_FAIL;
+        }
+
+        /* OK, we've finished verifying the device, lets continue with initialisation */
+
+        /* More device initialisation */
+        dev->all_gcs = 0;
+        dev->passive_gc_count = 0;
+        dev->oldest_dirty_gc_count = 0;
+        dev->bg_gcs = 0;
+        dev->gc_block_finder = 0;
+        dev->buffered_block = -1;
+        dev->doing_buffered_block_rewrite = 0;
+        dev->n_deleted_files = 0;
+        dev->n_bg_deletions = 0;
+        dev->n_unlinked_files = 0;
+        dev->n_ecc_fixed = 0;
+        dev->n_ecc_unfixed = 0;
+        dev->n_tags_ecc_fixed = 0;
+        dev->n_tags_ecc_unfixed = 0;
+        dev->n_erase_failures = 0;
+        dev->n_erased_blocks = 0;
+        dev->gc_disable = 0;
+        dev->has_pending_prioritised_gc = 1;    /* Assume the worst for now, will get fixed on first GC */
+        INIT_LIST_HEAD(&dev->dirty_dirs);
+        dev->oldest_dirty_seq = 0;
+        dev->oldest_dirty_block = 0;
+
+        /* Initialise temporary buffers and caches. */
+        if (!yaffs_init_tmp_buffers(dev))
+                init_failed = 1;
+
+        dev->cache = NULL;
+        dev->gc_cleanup_list = NULL;
+
+        if (!init_failed && dev->param.n_caches > 0) {
+                int i;
+                void *buf;
+                int cache_bytes =
+                    dev->param.n_caches * sizeof(struct yaffs_cache);
+
+                if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
+                        dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
+
+                dev->cache = kmalloc(cache_bytes, GFP_NOFS);
+
+                buf = (u8 *) dev->cache;
+
+                if (dev->cache)
+                        memset(dev->cache, 0, cache_bytes);
+
+                for (i = 0; i < dev->param.n_caches && buf; i++) {
+                        dev->cache[i].object = NULL;
+                        dev->cache[i].last_use = 0;
+                        dev->cache[i].dirty = 0;
+                        dev->cache[i].data = buf =
+                            kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+                }
+                if (!buf)
+                        init_failed = 1;
+
+                dev->cache_last_use = 0;
+        }
+
+        dev->cache_hits = 0;
+
+        if (!init_failed) {
+                dev->gc_cleanup_list =
+                    kmalloc(dev->param.chunks_per_block * sizeof(u32),
+                                        GFP_NOFS);
+                if (!dev->gc_cleanup_list)
+                        init_failed = 1;
+        }
+
+        if (dev->param.is_yaffs2)
+                dev->param.use_header_file_size = 1;
+
+        if (!init_failed && !yaffs_init_blocks(dev))
+                init_failed = 1;
+
+        yaffs_init_tnodes_and_objs(dev);
+
+        if (!init_failed && !yaffs_create_initial_dir(dev))
+                init_failed = 1;
+
+        if (!init_failed) {
+                /* Now scan the flash. */
+                if (dev->param.is_yaffs2) {
+                        if (yaffs2_checkpt_restore(dev)) {
+                                yaffs_check_obj_details_loaded(dev->root_dir);
+                                yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
+                                        "yaffs: restored from checkpoint"
+                                        );
+                        } else {
+
+                                /* Clean up the mess caused by an aborted checkpoint load
+                                 * and scan backwards.
+                                 */
+                                yaffs_deinit_blocks(dev);
+
+                                yaffs_deinit_tnodes_and_objs(dev);
+
+                                dev->n_erased_blocks = 0;
+                                dev->n_free_chunks = 0;
+                                dev->alloc_block = -1;
+                                dev->alloc_page = -1;
+                                dev->n_deleted_files = 0;
+                                dev->n_unlinked_files = 0;
+                                dev->n_bg_deletions = 0;
+
+                                if (!init_failed && !yaffs_init_blocks(dev))
+                                        init_failed = 1;
+
+                                yaffs_init_tnodes_and_objs(dev);
+
+                                if (!init_failed
+                                    && !yaffs_create_initial_dir(dev))
+                                        init_failed = 1;
+
+                                if (!init_failed && !yaffs2_scan_backwards(dev))
+                                        init_failed = 1;
+                        }
+                } else if (!yaffs1_scan(dev)) {
+                        init_failed = 1;
+                }
+
+                yaffs_strip_deleted_objs(dev);
+                yaffs_fix_hanging_objs(dev);
+                if (dev->param.empty_lost_n_found)
+                        yaffs_empty_l_n_f(dev);
+        }
+
+        if (init_failed) {
+                /* Clean up the mess */
+                yaffs_trace(YAFFS_TRACE_TRACING,
+                  "yaffs: yaffs_guts_initialise() aborted.");
+
+                yaffs_deinitialise(dev);
+                return YAFFS_FAIL;
+        }
+
+        /* Zero out stats */
+        dev->n_page_reads = 0;
+        dev->n_page_writes = 0;
+        dev->n_erasures = 0;
+        dev->n_gc_copies = 0;
+        dev->n_retired_writes = 0;
+
+        dev->n_retired_blocks = 0;
+
+        yaffs_verify_free_chunks(dev);
+        yaffs_verify_blocks(dev);
+
+        /* Clean up any aborted checkpoint data */
+        if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
+                yaffs2_checkpt_invalidate(dev);
+
+        yaffs_trace(YAFFS_TRACE_TRACING,
+          "yaffs: yaffs_guts_initialise() done.");
+        return YAFFS_OK;
+
+}
+
+void yaffs_deinitialise(struct yaffs_dev *dev)
+{
+        if (dev->is_mounted) {
+                int i;
+
+                yaffs_deinit_blocks(dev);
+                yaffs_deinit_tnodes_and_objs(dev);
+                if (dev->param.n_caches > 0 && dev->cache) {
+
+                        for (i = 0; i < dev->param.n_caches; i++) {
+                                if (dev->cache[i].data)
+                                        kfree(dev->cache[i].data);
+                                dev->cache[i].data = NULL;
+                        }
+
+                        kfree(dev->cache);
+                        dev->cache = NULL;
+                }
+
+                kfree(dev->gc_cleanup_list);
+
+                for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+                        kfree(dev->temp_buffer[i].buffer);
+
+                dev->is_mounted = 0;
+
+                if (dev->param.deinitialise_flash_fn)
+                        dev->param.deinitialise_flash_fn(dev);
+        }
+}
+
+int yaffs_count_free_chunks(struct yaffs_dev *dev)
+{
+        int n_free = 0;
+        int b;
+
+        struct yaffs_block_info *blk;
+
+        blk = dev->block_info;
+        for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+                switch (blk->block_state) {
+                case YAFFS_BLOCK_STATE_EMPTY:
+                case YAFFS_BLOCK_STATE_ALLOCATING:
+                case YAFFS_BLOCK_STATE_COLLECTING:
+                case YAFFS_BLOCK_STATE_FULL:
+                        n_free +=
+                            (dev->param.chunks_per_block - blk->pages_in_use +
+                             blk->soft_del_pages);
+                        break;
+                default:
+                        break;
+                }
+                blk++;
+        }
+
+        return n_free;
+}
+
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
+{
+        /* This is what we report to the outside world */
+
+        int n_free;
+        int n_dirty_caches;
+        int blocks_for_checkpt;
+        int i;
+
+        n_free = dev->n_free_chunks;
+        n_free += dev->n_deleted_files;
+
+        /* Now count the number of dirty chunks in the cache and subtract those */
+
+        for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
+                if (dev->cache[i].dirty)
+                        n_dirty_caches++;
+        }
+
+        n_free -= n_dirty_caches;
+
+        n_free -=
+            ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
+
+        /* Now we figure out how much to reserve for the checkpoint and report that... */
+        blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
+
+        n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
+
+        if (n_free < 0)
+                n_free = 0;
+
+        return n_free;
+
+}
diff --git a/fs/yaffs2/yaffs_guts.h b/fs/yaffs2/yaffs_guts.h
new file mode 100644
index 00000000000..307eba28676
--- /dev/null
+++ b/fs/yaffs2/yaffs_guts.h
@@ -0,0 +1,915 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_GUTS_H__
+#define __YAFFS_GUTS_H__
+
+#include "yportenv.h"
+
+#define YAFFS_OK        1
+#define YAFFS_FAIL  0
+
+/* Give us a  Y=0x59,
+ * Give us an A=0x41,
+ * Give us an FF=0xFF
+ * Give us an S=0x53
+ * And what have we got...
+ */
+#define YAFFS_MAGIC                     0x5941FF53
+
+#define YAFFS_NTNODES_LEVEL0            16
+#define YAFFS_TNODES_LEVEL0_BITS        4
+#define YAFFS_TNODES_LEVEL0_MASK        0xf
+
+#define YAFFS_NTNODES_INTERNAL          (YAFFS_NTNODES_LEVEL0 / 2)
+#define YAFFS_TNODES_INTERNAL_BITS      (YAFFS_TNODES_LEVEL0_BITS - 1)
+#define YAFFS_TNODES_INTERNAL_MASK      0x7
+#define YAFFS_TNODES_MAX_LEVEL          6
+
+#ifndef CONFIG_YAFFS_NO_YAFFS1
+#define YAFFS_BYTES_PER_SPARE           16
+#define YAFFS_BYTES_PER_CHUNK           512
+#define YAFFS_CHUNK_SIZE_SHIFT          9
+#define YAFFS_CHUNKS_PER_BLOCK          32
+#define YAFFS_BYTES_PER_BLOCK           (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
+#endif
+
+#define YAFFS_MIN_YAFFS2_CHUNK_SIZE     1024
+#define YAFFS_MIN_YAFFS2_SPARE_SIZE     32
+
+#define YAFFS_MAX_CHUNK_ID              0x000FFFFF
+
+#define YAFFS_ALLOCATION_NOBJECTS       100
+#define YAFFS_ALLOCATION_NTNODES        100
+#define YAFFS_ALLOCATION_NLINKS         100
+
+#define YAFFS_NOBJECT_BUCKETS           256
+
+#define YAFFS_OBJECT_SPACE              0x40000
+#define YAFFS_MAX_OBJECT_ID             (YAFFS_OBJECT_SPACE -1)
+
+#define YAFFS_CHECKPOINT_VERSION        4
+
+#ifdef CONFIG_YAFFS_UNICODE
+#define YAFFS_MAX_NAME_LENGTH           127
+#define YAFFS_MAX_ALIAS_LENGTH          79
+#else
+#define YAFFS_MAX_NAME_LENGTH           255
+#define YAFFS_MAX_ALIAS_LENGTH          159
+#endif
+
+#define YAFFS_SHORT_NAME_LENGTH         15
+
+/* Some special object ids for pseudo objects */
+#define YAFFS_OBJECTID_ROOT             1
+#define YAFFS_OBJECTID_LOSTNFOUND       2
+#define YAFFS_OBJECTID_UNLINKED         3
+#define YAFFS_OBJECTID_DELETED          4
+
+/* Pseudo object ids for checkpointing */
+#define YAFFS_OBJECTID_SB_HEADER        0x10
+#define YAFFS_OBJECTID_CHECKPOINT_DATA  0x20
+#define YAFFS_SEQUENCE_CHECKPOINT_DATA  0x21
+
+#define YAFFS_MAX_SHORT_OP_CACHES       20
+
+#define YAFFS_N_TEMP_BUFFERS            6
+
+/* We limit the number attempts at sucessfully saving a chunk of data.
+ * Small-page devices have 32 pages per block; large-page devices have 64.
+ * Default to something in the order of 5 to 10 blocks worth of chunks.
+ */
+#define YAFFS_WR_ATTEMPTS               (5*64)
+
+/* Sequence numbers are used in YAFFS2 to determine block allocation order.
+ * The range is limited slightly to help distinguish bad numbers from good.
+ * This also allows us to perhaps in the future use special numbers for
+ * special purposes.
+ * EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years,
+ * and is a larger number than the lifetime of a 2GB device.
+ */
+#define YAFFS_LOWEST_SEQUENCE_NUMBER    0x00001000
+#define YAFFS_HIGHEST_SEQUENCE_NUMBER   0xEFFFFF00
+
+/* Special sequence number for bad block that failed to be marked bad */
+#define YAFFS_SEQUENCE_BAD_BLOCK        0xFFFF0000
+
+/* ChunkCache is used for short read/write operations.*/
+struct yaffs_cache {
+        struct yaffs_obj *object;
+        int chunk_id;
+        int last_use;
+        int dirty;
+        int n_bytes;            /* Only valid if the cache is dirty */
+        int locked;             /* Can't push out or flush while locked. */
+        u8 *data;
+};
+
+/* Tags structures in RAM
+ * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
+ * the structure size will get blown out.
+ */
+
+#ifndef CONFIG_YAFFS_NO_YAFFS1
+struct yaffs_tags {
+        unsigned chunk_id:20;
+        unsigned serial_number:2;
+        unsigned n_bytes_lsb:10;
+        unsigned obj_id:18;
+        unsigned ecc:12;
+        unsigned n_bytes_msb:2;
+};
+
+union yaffs_tags_union {
+        struct yaffs_tags as_tags;
+        u8 as_bytes[8];
+};
+
+#endif
+
+/* Stuff used for extended tags in YAFFS2 */
+
+enum yaffs_ecc_result {
+        YAFFS_ECC_RESULT_UNKNOWN,
+        YAFFS_ECC_RESULT_NO_ERROR,
+        YAFFS_ECC_RESULT_FIXED,
+        YAFFS_ECC_RESULT_UNFIXED
+};
+
+enum yaffs_obj_type {
+        YAFFS_OBJECT_TYPE_UNKNOWN,
+        YAFFS_OBJECT_TYPE_FILE,
+        YAFFS_OBJECT_TYPE_SYMLINK,
+        YAFFS_OBJECT_TYPE_DIRECTORY,
+        YAFFS_OBJECT_TYPE_HARDLINK,
+        YAFFS_OBJECT_TYPE_SPECIAL
+};
+
+#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
+
+struct yaffs_ext_tags {
+
+        unsigned validity0;
+        unsigned chunk_used;    /*  Status of the chunk: used or unused */
+        unsigned obj_id;        /* If 0 then this is not part of an object (unused) */
+        unsigned chunk_id;      /* If 0 then this is a header, else a data chunk */
+        unsigned n_bytes;       /* Only valid for data chunks */
+
+        /* The following stuff only has meaning when we read */
+        enum yaffs_ecc_result ecc_result;
+        unsigned block_bad;
+
+        /* YAFFS 1 stuff */
+        unsigned is_deleted;    /* The chunk is marked deleted */
+        unsigned serial_number; /* Yaffs1 2-bit serial number */
+
+        /* YAFFS2 stuff */
+        unsigned seq_number;    /* The sequence number of this block */
+
+        /* Extra info if this is an object header (YAFFS2 only) */
+
+        unsigned extra_available;       /* There is extra info available if this is not zero */
+        unsigned extra_parent_id;       /* The parent object */
+        unsigned extra_is_shrink;       /* Is it a shrink header? */
+        unsigned extra_shadows; /* Does this shadow another object? */
+
+        enum yaffs_obj_type extra_obj_type;     /* What object type? */
+
+        unsigned extra_length;  /* Length if it is a file */
+        unsigned extra_equiv_id;        /* Equivalent object Id if it is a hard link */
+
+        unsigned validity1;
+
+};
+
+/* Spare structure for YAFFS1 */
+struct yaffs_spare {
+        u8 tb0;
+        u8 tb1;
+        u8 tb2;
+        u8 tb3;
+        u8 page_status;         /* set to 0 to delete the chunk */
+        u8 block_status;
+        u8 tb4;
+        u8 tb5;
+        u8 ecc1[3];
+        u8 tb6;
+        u8 tb7;
+        u8 ecc2[3];
+};
+
+/*Special structure for passing through to mtd */
+struct yaffs_nand_spare {
+        struct yaffs_spare spare;
+        int eccres1;
+        int eccres2;
+};
+
+/* Block data in RAM */
+
+enum yaffs_block_state {
+        YAFFS_BLOCK_STATE_UNKNOWN = 0,
+
+        YAFFS_BLOCK_STATE_SCANNING,
+        /* Being scanned */
+
+        YAFFS_BLOCK_STATE_NEEDS_SCANNING,
+        /* The block might have something on it (ie it is allocating or full, perhaps empty)
+         * but it needs to be scanned to determine its true state.
+         * This state is only valid during scanning.
+         * NB We tolerate empty because the pre-scanner might be incapable of deciding
+         * However, if this state is returned on a YAFFS2 device, then we expect a sequence number
+         */
+
+        YAFFS_BLOCK_STATE_EMPTY,
+        /* This block is empty */
+
+        YAFFS_BLOCK_STATE_ALLOCATING,
+        /* This block is partially allocated.
+         * At least one page holds valid data.
+         * This is the one currently being used for page
+         * allocation. Should never be more than one of these.
+         * If a block is only partially allocated at mount it is treated as full.
+         */
+
+        YAFFS_BLOCK_STATE_FULL,
+        /* All the pages in this block have been allocated.
+         * If a block was only partially allocated when mounted we treat
+         * it as fully allocated.
+         */
+
+        YAFFS_BLOCK_STATE_DIRTY,
+        /* The block was full and now all chunks have been deleted.
+         * Erase me, reuse me.
+         */
+
+        YAFFS_BLOCK_STATE_CHECKPOINT,
+        /* This block is assigned to holding checkpoint data. */
+
+        YAFFS_BLOCK_STATE_COLLECTING,
+        /* This block is being garbage collected */
+
+        YAFFS_BLOCK_STATE_DEAD
+            /* This block has failed and is not in use */
+};
+
+#define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
+
+struct yaffs_block_info {
+
+        int soft_del_pages:10;  /* number of soft deleted pages */
+        int pages_in_use:10;    /* number of pages in use */
+        unsigned block_state:4; /* One of the above block states. NB use unsigned because enum is sometimes an int */
+        u32 needs_retiring:1;   /* Data has failed on this block, need to get valid data off */
+        /* and retire the block. */
+        u32 skip_erased_check:1;        /* If this is set we can skip the erased check on this block */
+        u32 gc_prioritise:1;    /* An ECC check or blank check has failed on this block.
+                                   It should be prioritised for GC */
+        u32 chunk_error_strikes:3;      /* How many times we've had ecc etc failures on this block and tried to reuse it */
+
+#ifdef CONFIG_YAFFS_YAFFS2
+        u32 has_shrink_hdr:1;   /* This block has at least one shrink object header */
+        u32 seq_number;         /* block sequence number for yaffs2 */
+#endif
+
+};
+
+/* -------------------------- Object structure -------------------------------*/
+/* This is the object structure as stored on NAND */
+
+struct yaffs_obj_hdr {
+        enum yaffs_obj_type type;
+
+        /* Apply to everything  */
+        int parent_obj_id;
+        u16 sum_no_longer_used; /* checksum of name. No longer used */
+        YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+        /* The following apply to directories, files, symlinks - not hard links */
+        u32 yst_mode;           /* protection */
+
+        u32 yst_uid;
+        u32 yst_gid;
+        u32 yst_atime;
+        u32 yst_mtime;
+        u32 yst_ctime;
+
+        /* File size  applies to files only */
+        int file_size;
+
+        /* Equivalent object id applies to hard links only. */
+        int equiv_id;
+
+        /* Alias is for symlinks only. */
+        YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
+
+        u32 yst_rdev;           /* device stuff for block and char devices (major/min) */
+
+        u32 win_ctime[2];
+        u32 win_atime[2];
+        u32 win_mtime[2];
+
+        u32 inband_shadowed_obj_id;
+        u32 inband_is_shrink;
+
+        u32 reserved[2];
+        int shadows_obj;        /* This object header shadows the specified object if > 0 */
+
+        /* is_shrink applies to object headers written when we shrink the file (ie resize) */
+        u32 is_shrink;
+
+};
+
+/*--------------------------- Tnode -------------------------- */
+
+struct yaffs_tnode {
+        struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL];
+};
+
+/*------------------------  Object -----------------------------*/
+/* An object can be one of:
+ * - a directory (no data, has children links
+ * - a regular file (data.... not prunes :->).
+ * - a symlink [symbolic link] (the alias).
+ * - a hard link
+ */
+
+struct yaffs_file_var {
+        u32 file_size;
+        u32 scanned_size;
+        u32 shrink_size;
+        int top_level;
+        struct yaffs_tnode *top;
+};
+
+struct yaffs_dir_var {
+        struct list_head children;      /* list of child links */
+        struct list_head dirty; /* Entry for list of dirty directories */
+};
+
+struct yaffs_symlink_var {
+        YCHAR *alias;
+};
+
+struct yaffs_hardlink_var {
+        struct yaffs_obj *equiv_obj;
+        u32 equiv_id;
+};
+
+union yaffs_obj_var {
+        struct yaffs_file_var file_variant;
+        struct yaffs_dir_var dir_variant;
+        struct yaffs_symlink_var symlink_variant;
+        struct yaffs_hardlink_var hardlink_variant;
+};
+
+struct yaffs_obj {
+        u8 deleted:1;           /* This should only apply to unlinked files. */
+        u8 soft_del:1;          /* it has also been soft deleted */
+        u8 unlinked:1;          /* An unlinked file. The file should be in the unlinked directory. */
+        u8 fake:1;              /* A fake object has no presence on NAND. */
+        u8 rename_allowed:1;    /* Some objects are not allowed to be renamed. */
+        u8 unlink_allowed:1;
+        u8 dirty:1;             /* the object needs to be written to flash */
+        u8 valid:1;             /* When the file system is being loaded up, this
+                                 * object might be created before the data
+                                 * is available (ie. file data records appear before the header).
+                                 */
+        u8 lazy_loaded:1;       /* This object has been lazy loaded and is missing some detail */
+
+        u8 defered_free:1;      /* For Linux kernel. Object is removed from NAND, but is
+                                 * still in the inode cache. Free of object is defered.
+                                 * until the inode is released.
+                                 */
+        u8 being_created:1;     /* This object is still being created so skip some checks. */
+        u8 is_shadowed:1;       /* This object is shadowed on the way to being renamed. */
+
+        u8 xattr_known:1;       /* We know if this has object has xattribs or not. */
+        u8 has_xattr:1;         /* This object has xattribs. Valid if xattr_known. */
+
+        u8 serial;              /* serial number of chunk in NAND. Cached here */
+        u16 sum;                /* sum of the name to speed searching */
+
+        struct yaffs_dev *my_dev;       /* The device I'm on */
+
+        struct list_head hash_link;     /* list of objects in this hash bucket */
+
+        struct list_head hard_links;    /* all the equivalent hard linked objects */
+
+        /* directory structure stuff */
+        /* also used for linking up the free list */
+        struct yaffs_obj *parent;
+        struct list_head siblings;
+
+        /* Where's my object header in NAND? */
+        int hdr_chunk;
+
+        int n_data_chunks;      /* Number of data chunks attached to the file. */
+
+        u32 obj_id;             /* the object id value */
+
+        u32 yst_mode;
+
+#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
+        YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
+#endif
+
+#ifdef CONFIG_YAFFS_WINCE
+        u32 win_ctime[2];
+        u32 win_mtime[2];
+        u32 win_atime[2];
+#else
+        u32 yst_uid;
+        u32 yst_gid;
+        u32 yst_atime;
+        u32 yst_mtime;
+        u32 yst_ctime;
+#endif
+
+        u32 yst_rdev;
+
+        void *my_inode;
+
+        enum yaffs_obj_type variant_type;
+
+        union yaffs_obj_var variant;
+
+};
+
+struct yaffs_obj_bucket {
+        struct list_head list;
+        int count;
+};
+
+/* yaffs_checkpt_obj holds the definition of an object as dumped
+ * by checkpointing.
+ */
+
+struct yaffs_checkpt_obj {
+        int struct_type;
+        u32 obj_id;
+        u32 parent_id;
+        int hdr_chunk;
+        enum yaffs_obj_type variant_type:3;
+        u8 deleted:1;
+        u8 soft_del:1;
+        u8 unlinked:1;
+        u8 fake:1;
+        u8 rename_allowed:1;
+        u8 unlink_allowed:1;
+        u8 serial;
+        int n_data_chunks;
+        u32 size_or_equiv_obj;
+};
+
+/*--------------------- Temporary buffers ----------------
+ *
+ * These are chunk-sized working buffers. Each device has a few
+ */
+
+struct yaffs_buffer {
+        u8 *buffer;
+        int line;               /* track from whence this buffer was allocated */
+        int max_line;
+};
+
+/*----------------- Device ---------------------------------*/
+
+struct yaffs_param {
+        const YCHAR *name;
+
+        /*
+         * Entry parameters set up way early. Yaffs sets up the rest.
+         * The structure should be zeroed out before use so that unused
+         * and defualt values are zero.
+         */
+
+        int inband_tags;        /* Use unband tags */
+        u32 total_bytes_per_chunk;      /* Should be >= 512, does not need to be a power of 2 */
+        int chunks_per_block;   /* does not need to be a power of 2 */
+        int spare_bytes_per_chunk;      /* spare area size */
+        int start_block;        /* Start block we're allowed to use */
+        int end_block;          /* End block we're allowed to use */
+        int n_reserved_blocks;  /* We want this tuneable so that we can reduce */
+        /* reserved blocks on NOR and RAM. */
+
+        int n_caches;           /* If <= 0, then short op caching is disabled, else
+                                 * the number of short op caches (don't use too many).
+                                 * 10 to 20 is a good bet.
+                                 */
+        int use_nand_ecc;       /* Flag to decide whether or not to use NANDECC on data (yaffs1) */
+        int no_tags_ecc;        /* Flag to decide whether or not to do ECC on packed tags (yaffs2) */
+
+        int is_yaffs2;          /* Use yaffs2 mode on this device */
+
+        int empty_lost_n_found; /* Auto-empty lost+found directory on mount */
+
+        int refresh_period;     /* How often we should check to do a block refresh */
+
+        /* Checkpoint control. Can be set before or after initialisation */
+        u8 skip_checkpt_rd;
+        u8 skip_checkpt_wr;
+
+        int enable_xattr;       /* Enable xattribs */
+
+        /* NAND access functions (Must be set before calling YAFFS) */
+
+        int (*write_chunk_fn) (struct yaffs_dev * dev,
+                               int nand_chunk, const u8 * data,
+                               const struct yaffs_spare * spare);
+        int (*read_chunk_fn) (struct yaffs_dev * dev,
+                              int nand_chunk, u8 * data,
+                              struct yaffs_spare * spare);
+        int (*erase_fn) (struct yaffs_dev * dev, int flash_block);
+        int (*initialise_flash_fn) (struct yaffs_dev * dev);
+        int (*deinitialise_flash_fn) (struct yaffs_dev * dev);
+
+#ifdef CONFIG_YAFFS_YAFFS2
+        int (*write_chunk_tags_fn) (struct yaffs_dev * dev,
+                                    int nand_chunk, const u8 * data,
+                                    const struct yaffs_ext_tags * tags);
+        int (*read_chunk_tags_fn) (struct yaffs_dev * dev,
+                                   int nand_chunk, u8 * data,
+                                   struct yaffs_ext_tags * tags);
+        int (*bad_block_fn) (struct yaffs_dev * dev, int block_no);
+        int (*query_block_fn) (struct yaffs_dev * dev, int block_no,
+                               enum yaffs_block_state * state,
+                               u32 * seq_number);
+#endif
+
+        /* The remove_obj_fn function must be supplied by OS flavours that
+         * need it.
+         * yaffs direct uses it to implement the faster readdir.
+         * Linux uses it to protect the directory during unlocking.
+         */
+        void (*remove_obj_fn) (struct yaffs_obj * obj);
+
+        /* Callback to mark the superblock dirty */
+        void (*sb_dirty_fn) (struct yaffs_dev * dev);
+
+        /*  Callback to control garbage collection. */
+        unsigned (*gc_control) (struct yaffs_dev * dev);
+
+        /* Debug control flags. Don't use unless you know what you're doing */
+        int use_header_file_size;       /* Flag to determine if we should use file sizes from the header */
+        int disable_lazy_load;  /* Disable lazy loading on this device */
+        int wide_tnodes_disabled;       /* Set to disable wide tnodes */
+        int disable_soft_del;   /* yaffs 1 only: Set to disable the use of softdeletion. */
+
+        int defered_dir_update; /* Set to defer directory updates */
+
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+        int auto_unicode;
+#endif
+        int always_check_erased;        /* Force chunk erased check always on */
+};
+
+struct yaffs_dev {
+        struct yaffs_param param;
+
+        /* Context storage. Holds extra OS specific data for this device */
+
+        void *os_context;
+        void *driver_context;
+
+        struct list_head dev_list;
+
+        /* Runtime parameters. Set up by YAFFS. */
+        int data_bytes_per_chunk;
+
+        /* Non-wide tnode stuff */
+        u16 chunk_grp_bits;     /* Number of bits that need to be resolved if
+                                 * the tnodes are not wide enough.
+                                 */
+        u16 chunk_grp_size;     /* == 2^^chunk_grp_bits */
+
+        /* Stuff to support wide tnodes */
+        u32 tnode_width;
+        u32 tnode_mask;
+        u32 tnode_size;
+
+        /* Stuff for figuring out file offset to chunk conversions */
+        u32 chunk_shift;        /* Shift value */
+        u32 chunk_div;          /* Divisor after shifting: 1 for power-of-2 sizes */
+        u32 chunk_mask;         /* Mask to use for power-of-2 case */
+
+        int is_mounted;
+        int read_only;
+        int is_checkpointed;
+
+        /* Stuff to support block offsetting to support start block zero */
+        int internal_start_block;
+        int internal_end_block;
+        int block_offset;
+        int chunk_offset;
+
+        /* Runtime checkpointing stuff */
+        int checkpt_page_seq;   /* running sequence number of checkpoint pages */
+        int checkpt_byte_count;
+        int checkpt_byte_offs;
+        u8 *checkpt_buffer;
+        int checkpt_open_write;
+        int blocks_in_checkpt;
+        int checkpt_cur_chunk;
+        int checkpt_cur_block;
+        int checkpt_next_block;
+        int *checkpt_block_list;
+        int checkpt_max_blocks;
+        u32 checkpt_sum;
+        u32 checkpt_xor;
+
+        int checkpoint_blocks_required; /* Number of blocks needed to store current checkpoint set */
+
+        /* Block Info */
+        struct yaffs_block_info *block_info;
+        u8 *chunk_bits;         /* bitmap of chunks in use */
+        unsigned block_info_alt:1;      /* was allocated using alternative strategy */
+        unsigned chunk_bits_alt:1;      /* was allocated using alternative strategy */
+        int chunk_bit_stride;   /* Number of bytes of chunk_bits per block.
+                                 * Must be consistent with chunks_per_block.
+                                 */
+
+        int n_erased_blocks;
+        int alloc_block;        /* Current block being allocated off */
+        u32 alloc_page;
+        int alloc_block_finder; /* Used to search for next allocation block */
+
+        /* Object and Tnode memory management */
+        void *allocator;
+        int n_obj;
+        int n_tnodes;
+
+        int n_hardlinks;
+
+        struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
+        u32 bucket_finder;
+
+        int n_free_chunks;
+
+        /* Garbage collection control */
+        u32 *gc_cleanup_list;   /* objects to delete at the end of a GC. */
+        u32 n_clean_ups;
+
+        unsigned has_pending_prioritised_gc;    /* We think this device might have pending prioritised gcs */
+        unsigned gc_disable;
+        unsigned gc_block_finder;
+        unsigned gc_dirtiest;
+        unsigned gc_pages_in_use;
+        unsigned gc_not_done;
+        unsigned gc_block;
+        unsigned gc_chunk;
+        unsigned gc_skip;
+
+        /* Special directories */
+        struct yaffs_obj *root_dir;
+        struct yaffs_obj *lost_n_found;
+
+        /* Buffer areas for storing data to recover from write failures TODO
+         *      u8            buffered_data[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
+         *      struct yaffs_spare buffered_spare[YAFFS_CHUNKS_PER_BLOCK];
+         */
+
+        int buffered_block;     /* Which block is buffered here? */
+        int doing_buffered_block_rewrite;
+
+        struct yaffs_cache *cache;
+        int cache_last_use;
+
+        /* Stuff for background deletion and unlinked files. */
+        struct yaffs_obj *unlinked_dir; /* Directory where unlinked and deleted files live. */
+        struct yaffs_obj *del_dir;      /* Directory where deleted objects are sent to disappear. */
+        struct yaffs_obj *unlinked_deletion;    /* Current file being background deleted. */
+        int n_deleted_files;    /* Count of files awaiting deletion; */
+        int n_unlinked_files;   /* Count of unlinked files. */
+        int n_bg_deletions;     /* Count of background deletions. */
+
+        /* Temporary buffer management */
+        struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS];
+        int max_temp;
+        int temp_in_use;
+        int unmanaged_buffer_allocs;
+        int unmanaged_buffer_deallocs;
+
+        /* yaffs2 runtime stuff */
+        unsigned seq_number;    /* Sequence number of currently allocating block */
+        unsigned oldest_dirty_seq;
+        unsigned oldest_dirty_block;
+
+        /* Block refreshing */
+        int refresh_skip;       /* A skip down counter. Refresh happens when this gets to zero. */
+
+        /* Dirty directory handling */
+        struct list_head dirty_dirs;    /* List of dirty directories */
+
+        /* Statistcs */
+        u32 n_page_writes;
+        u32 n_page_reads;
+        u32 n_erasures;
+        u32 n_erase_failures;
+        u32 n_gc_copies;
+        u32 all_gcs;
+        u32 passive_gc_count;
+        u32 oldest_dirty_gc_count;
+        u32 n_gc_blocks;
+        u32 bg_gcs;
+        u32 n_retired_writes;
+        u32 n_retired_blocks;
+        u32 n_ecc_fixed;
+        u32 n_ecc_unfixed;
+        u32 n_tags_ecc_fixed;
+        u32 n_tags_ecc_unfixed;
+        u32 n_deletions;
+        u32 n_unmarked_deletions;
+        u32 refresh_count;
+        u32 cache_hits;
+
+};
+
+/* The CheckpointDevice structure holds the device information that changes at runtime and
+ * must be preserved over unmount/mount cycles.
+ */
+struct yaffs_checkpt_dev {
+        int struct_type;
+        int n_erased_blocks;
+        int alloc_block;        /* Current block being allocated off */
+        u32 alloc_page;
+        int n_free_chunks;
+
+        int n_deleted_files;    /* Count of files awaiting deletion; */
+        int n_unlinked_files;   /* Count of unlinked files. */
+        int n_bg_deletions;     /* Count of background deletions. */
+
+        /* yaffs2 runtime stuff */
+        unsigned seq_number;    /* Sequence number of currently allocating block */
+
+};
+
+struct yaffs_checkpt_validity {
+        int struct_type;
+        u32 magic;
+        u32 version;
+        u32 head;
+};
+
+struct yaffs_shadow_fixer {
+        int obj_id;
+        int shadowed_id;
+        struct yaffs_shadow_fixer *next;
+};
+
+/* Structure for doing xattr modifications */
+struct yaffs_xattr_mod {
+        int set;                /* If 0 then this is a deletion */
+        const YCHAR *name;
+        const void *data;
+        int size;
+        int flags;
+        int result;
+};
+
+/*----------------------- YAFFS Functions -----------------------*/
+
+int yaffs_guts_initialise(struct yaffs_dev *dev);
+void yaffs_deinitialise(struct yaffs_dev *dev);
+
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev);
+
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
+                     struct yaffs_obj *new_dir, const YCHAR * new_name);
+
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name);
+int yaffs_del_obj(struct yaffs_obj *obj);
+
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size);
+int yaffs_get_obj_length(struct yaffs_obj *obj);
+int yaffs_get_obj_inode(struct yaffs_obj *obj);
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
+int yaffs_get_obj_link_count(struct yaffs_obj *obj);
+
+/* File operations */
+int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, loff_t offset,
+                  int n_bytes);
+int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, loff_t offset,
+                  int n_bytes, int write_trhrough);
+int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size);
+
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+                                    const YCHAR * name, u32 mode, u32 uid,
+                                    u32 gid);
+
+int yaffs_flush_file(struct yaffs_obj *obj, int update_time, int data_sync);
+
+/* Flushing and checkpointing */
+void yaffs_flush_whole_cache(struct yaffs_dev *dev);
+
+int yaffs_checkpoint_save(struct yaffs_dev *dev);
+int yaffs_checkpoint_restore(struct yaffs_dev *dev);
+
+/* Directory operations */
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name,
+                                   u32 mode, u32 uid, u32 gid);
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir,
+                                     const YCHAR * name);
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number);
+
+/* Link operations */
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
+                                 struct yaffs_obj *equiv_obj);
+
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj);
+
+/* Symlink operations */
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+                                       const YCHAR * name, u32 mode, u32 uid,
+                                       u32 gid, const YCHAR * alias);
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj);
+
+/* Special inodes (fifos, sockets and devices) */
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+                                       const YCHAR * name, u32 mode, u32 uid,
+                                       u32 gid, u32 rdev);
+
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
+                      const void *value, int size, int flags);
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
+                      int size);
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size);
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name);
+
+/* Special directories */
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev);
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev);
+
+void yaffs_handle_defered_free(struct yaffs_obj *obj);
+
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev);
+
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency);
+
+/* Debug dump  */
+int yaffs_dump_obj(struct yaffs_obj *obj);
+
+void yaffs_guts_test(struct yaffs_dev *dev);
+
+/* A few useful functions to be used within the core files*/
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+                     int lyn);
+int yaffs_check_ff(u8 * buffer, int n_bytes);
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+                              struct yaffs_block_info *bi);
+
+u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev, int line_no);
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 * buffer, int line_no);
+
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+                                                 int number,
+                                                 enum yaffs_obj_type type);
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+                            int nand_chunk, int in_scan);
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name);
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+                                const struct yaffs_obj_hdr *oh);
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj);
+YCHAR *yaffs_clone_str(const YCHAR * str);
+void yaffs_link_fixup(struct yaffs_dev *dev, struct yaffs_obj *hard_list);
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no);
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name,
+                    int force, int is_shrink, int shadows,
+                    struct yaffs_xattr_mod *xop);
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+                               int backward_scanning);
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks);
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev);
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+                                           struct yaffs_file_var *file_struct,
+                                           u32 chunk_id,
+                                           struct yaffs_tnode *passed_tn);
+
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
+                     int n_bytes, int write_trhrough);
+void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size);
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev);
+
+int yaffs_count_free_chunks(struct yaffs_dev *dev);
+
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+                                       struct yaffs_file_var *file_struct,
+                                       u32 chunk_id);
+
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+                         unsigned pos);
+
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj);
+#endif
diff --git a/fs/yaffs2/yaffs_linux.h b/fs/yaffs2/yaffs_linux.h
new file mode 100644
index 00000000000..3b508cbc4e8
--- /dev/null
+++ b/fs/yaffs2/yaffs_linux.h
@@ -0,0 +1,41 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_LINUX_H__
+#define __YAFFS_LINUX_H__
+
+#include "yportenv.h"
+
+struct yaffs_linux_context {
+        struct list_head context_list;  /* List of these we have mounted */
+        struct yaffs_dev *dev;
+        struct super_block *super;
+        struct task_struct *bg_thread;  /* Background thread for this device */
+        int bg_running;
+        struct mutex gross_lock;        /* Gross locking mutex*/
+        u8 *spare_buffer;       /* For mtdif2 use. Don't know the size of the buffer
+                                 * at compile time so we have to allocate it.
+                                 */
+        struct list_head search_contexts;
+        void (*put_super_fn) (struct super_block * sb);
+
+        struct task_struct *readdir_process;
+        unsigned mount_id;
+};
+
+#define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context))
+#define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context))
+
+#endif
diff --git a/fs/yaffs2/yaffs_mtdif.c b/fs/yaffs2/yaffs_mtdif.c
new file mode 100644
index 00000000000..7cf53b3d91b
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif.c
@@ -0,0 +1,54 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yportenv.h"
+
+#include "yaffs_mtdif.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+#include "linux/mtd/nand.h"
+
+#include "yaffs_linux.h"
+
+int nandmtd_erase_block(struct yaffs_dev *dev, int block_no)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+        u32 addr =
+            ((loff_t) block_no) * dev->param.total_bytes_per_chunk
+            * dev->param.chunks_per_block;
+        struct erase_info ei;
+
+        int retval = 0;
+
+        ei.mtd = mtd;
+        ei.addr = addr;
+        ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
+        ei.time = 1000;
+        ei.retries = 2;
+        ei.callback = NULL;
+        ei.priv = (u_long) dev;
+
+        retval = mtd->erase(mtd, &ei);
+
+        if (retval == 0)
+                return YAFFS_OK;
+        else
+                return YAFFS_FAIL;
+}
+
+int nandmtd_initialise(struct yaffs_dev *dev)
+{
+        return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_mtdif.h b/fs/yaffs2/yaffs_mtdif.h
new file mode 100644
index 00000000000..666507417fe
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif.h
@@ -0,0 +1,23 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_MTDIF_H__
+#define __YAFFS_MTDIF_H__
+
+#include "yaffs_guts.h"
+
+int nandmtd_erase_block(struct yaffs_dev *dev, int block_no);
+int nandmtd_initialise(struct yaffs_dev *dev);
+#endif
diff --git a/fs/yaffs2/yaffs_mtdif1.c b/fs/yaffs2/yaffs_mtdif1.c
new file mode 100644
index 00000000000..51083695eb3
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif1.c
@@ -0,0 +1,330 @@
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This module provides the interface between yaffs_nand.c and the
+ * MTD API.  This version is used when the MTD interface supports the
+ * 'mtd_oob_ops' style calls to read_oob and write_oob, circa 2.6.17,
+ * and we have small-page NAND device.
+ *
+ * These functions are invoked via function pointers in yaffs_nand.c.
+ * This replaces functionality provided by functions in yaffs_mtdif.c
+ * and the yaffs_tags compatability functions in yaffs_tagscompat.c that are
+ * called in yaffs_mtdif.c when the function pointers are NULL.
+ * We assume the MTD layer is performing ECC (use_nand_ecc is true).
+ */
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+#include "yaffs_packedtags1.h"
+#include "yaffs_tagscompat.h"   /* for yaffs_calc_tags_ecc */
+#include "yaffs_linux.h"
+
+#include "linux/kernel.h"
+#include "linux/version.h"
+#include "linux/types.h"
+#include "linux/mtd/mtd.h"
+
+#ifndef CONFIG_YAFFS_9BYTE_TAGS
+# define YTAG1_SIZE 8
+#else
+# define YTAG1_SIZE 9
+#endif
+
+/* Write a chunk (page) of data to NAND.
+ *
+ * Caller always provides ExtendedTags data which are converted to a more
+ * compact (packed) form for storage in NAND.  A mini-ECC runs over the
+ * contents of the tags meta-data; used to valid the tags when read.
+ *
+ *  - Pack ExtendedTags to packed_tags1 form
+ *  - Compute mini-ECC for packed_tags1
+ *  - Write data and packed tags to NAND.
+ *
+ * Note: Due to the use of the packed_tags1 meta-data which does not include
+ * a full sequence number (as found in the larger packed_tags2 form) it is
+ * necessary for Yaffs to re-write a chunk/page (just once) to mark it as
+ * discarded and dirty.  This is not ideal: newer NAND parts are supposed
+ * to be written just once.  When Yaffs performs this operation, this
+ * function is called with a NULL data pointer -- calling MTD write_oob
+ * without data is valid usage (2.6.17).
+ *
+ * Any underlying MTD error results in YAFFS_FAIL.
+ * Returns YAFFS_OK or YAFFS_FAIL.
+ */
+int nandmtd1_write_chunk_tags(struct yaffs_dev *dev,
+                              int nand_chunk, const u8 * data,
+                              const struct yaffs_ext_tags *etags)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+        int chunk_bytes = dev->data_bytes_per_chunk;
+        loff_t addr = ((loff_t) nand_chunk) * chunk_bytes;
+        struct mtd_oob_ops ops;
+        struct yaffs_packed_tags1 pt1;
+        int retval;
+
+        /* we assume that packed_tags1 and struct yaffs_tags are compatible */
+        compile_time_assertion(sizeof(struct yaffs_packed_tags1) == 12);
+        compile_time_assertion(sizeof(struct yaffs_tags) == 8);
+
+        yaffs_pack_tags1(&pt1, etags);
+        yaffs_calc_tags_ecc((struct yaffs_tags *)&pt1);
+
+        /* When deleting a chunk, the upper layer provides only skeletal
+         * etags, one with is_deleted set.  However, we need to update the
+         * tags, not erase them completely.  So we use the NAND write property
+         * that only zeroed-bits stick and set tag bytes to all-ones and
+         * zero just the (not) deleted bit.
+         */
+#ifndef CONFIG_YAFFS_9BYTE_TAGS
+        if (etags->is_deleted) {
+                memset(&pt1, 0xff, 8);
+                /* clear delete status bit to indicate deleted */
+                pt1.deleted = 0;
+        }
+#else
+        ((u8 *) & pt1)[8] = 0xff;
+        if (etags->is_deleted) {
+                memset(&pt1, 0xff, 8);
+                /* zero page_status byte to indicate deleted */
+                ((u8 *) & pt1)[8] = 0;
+        }
+#endif
+
+        memset(&ops, 0, sizeof(ops));
+        ops.mode = MTD_OOB_AUTO;
+        ops.len = (data) ? chunk_bytes : 0;
+        ops.ooblen = YTAG1_SIZE;
+        ops.datbuf = (u8 *) data;
+        ops.oobbuf = (u8 *) & pt1;
+
+        retval = mtd->write_oob(mtd, addr, &ops);
+        if (retval) {
+                yaffs_trace(YAFFS_TRACE_MTD,
+                        "write_oob failed, chunk %d, mtd error %d",
+                        nand_chunk, retval);
+        }
+        return retval ? YAFFS_FAIL : YAFFS_OK;
+}
+
+/* Return with empty ExtendedTags but add ecc_result.
+ */
+static int rettags(struct yaffs_ext_tags *etags, int ecc_result, int retval)
+{
+        if (etags) {
+                memset(etags, 0, sizeof(*etags));
+                etags->ecc_result = ecc_result;
+        }
+        return retval;
+}
+
+/* Read a chunk (page) from NAND.
+ *
+ * Caller expects ExtendedTags data to be usable even on error; that is,
+ * all members except ecc_result and block_bad are zeroed.
+ *
+ *  - Check ECC results for data (if applicable)
+ *  - Check for blank/erased block (return empty ExtendedTags if blank)
+ *  - Check the packed_tags1 mini-ECC (correct if necessary/possible)
+ *  - Convert packed_tags1 to ExtendedTags
+ *  - Update ecc_result and block_bad members to refect state.
+ *
+ * Returns YAFFS_OK or YAFFS_FAIL.
+ */
+int nandmtd1_read_chunk_tags(struct yaffs_dev *dev,
+                             int nand_chunk, u8 * data,
+                             struct yaffs_ext_tags *etags)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+        int chunk_bytes = dev->data_bytes_per_chunk;
+        loff_t addr = ((loff_t) nand_chunk) * chunk_bytes;
+        int eccres = YAFFS_ECC_RESULT_NO_ERROR;
+        struct mtd_oob_ops ops;
+        struct yaffs_packed_tags1 pt1;
+        int retval;
+        int deleted;
+
+        memset(&ops, 0, sizeof(ops));
+        ops.mode = MTD_OOB_AUTO;
+        ops.len = (data) ? chunk_bytes : 0;
+        ops.ooblen = YTAG1_SIZE;
+        ops.datbuf = data;
+        ops.oobbuf = (u8 *) & pt1;
+
+        /* Read page and oob using MTD.
+         * Check status and determine ECC result.
+         */
+        retval = mtd->read_oob(mtd, addr, &ops);
+        if (retval) {
+                yaffs_trace(YAFFS_TRACE_MTD,
+                        "read_oob failed, chunk %d, mtd error %d",
+                        nand_chunk, retval);
+        }
+
+        switch (retval) {
+        case 0:
+                /* no error */
+                break;
+
+        case -EUCLEAN:
+                /* MTD's ECC fixed the data */
+                eccres = YAFFS_ECC_RESULT_FIXED;
+                dev->n_ecc_fixed++;
+                break;
+
+        case -EBADMSG:
+                /* MTD's ECC could not fix the data */
+                dev->n_ecc_unfixed++;
+                /* fall into... */
+        default:
+                rettags(etags, YAFFS_ECC_RESULT_UNFIXED, 0);
+                etags->block_bad = (mtd->block_isbad) (mtd, addr);
+                return YAFFS_FAIL;
+        }
+
+        /* Check for a blank/erased chunk.
+         */
+        if (yaffs_check_ff((u8 *) & pt1, 8)) {
+                /* when blank, upper layers want ecc_result to be <= NO_ERROR */
+                return rettags(etags, YAFFS_ECC_RESULT_NO_ERROR, YAFFS_OK);
+        }
+#ifndef CONFIG_YAFFS_9BYTE_TAGS
+        /* Read deleted status (bit) then return it to it's non-deleted
+         * state before performing tags mini-ECC check. pt1.deleted is
+         * inverted.
+         */
+        deleted = !pt1.deleted;
+        pt1.deleted = 1;
+#else
+        deleted = (yaffs_count_bits(((u8 *) & pt1)[8]) < 7);
+#endif
+
+        /* Check the packed tags mini-ECC and correct if necessary/possible.
+         */
+        retval = yaffs_check_tags_ecc((struct yaffs_tags *)&pt1);
+        switch (retval) {
+        case 0:
+                /* no tags error, use MTD result */
+                break;
+        case 1:
+                /* recovered tags-ECC error */
+                dev->n_tags_ecc_fixed++;
+                if (eccres == YAFFS_ECC_RESULT_NO_ERROR)
+                        eccres = YAFFS_ECC_RESULT_FIXED;
+                break;
+        default:
+                /* unrecovered tags-ECC error */
+                dev->n_tags_ecc_unfixed++;
+                return rettags(etags, YAFFS_ECC_RESULT_UNFIXED, YAFFS_FAIL);
+        }
+
+        /* Unpack the tags to extended form and set ECC result.
+         * [set should_be_ff just to keep yaffs_unpack_tags1 happy]
+         */
+        pt1.should_be_ff = 0xFFFFFFFF;
+        yaffs_unpack_tags1(etags, &pt1);
+        etags->ecc_result = eccres;
+
+        /* Set deleted state */
+        etags->is_deleted = deleted;
+        return YAFFS_OK;
+}
+
+/* Mark a block bad.
+ *
+ * This is a persistant state.
+ * Use of this function should be rare.
+ *
+ * Returns YAFFS_OK or YAFFS_FAIL.
+ */
+int nandmtd1_mark_block_bad(struct yaffs_dev *dev, int block_no)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+        int blocksize = dev->param.chunks_per_block * dev->data_bytes_per_chunk;
+        int retval;
+
+        yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+                "marking block %d bad", block_no);
+
+        retval = mtd->block_markbad(mtd, (loff_t) blocksize * block_no);
+        return (retval) ? YAFFS_FAIL : YAFFS_OK;
+}
+
+/* Check any MTD prerequists.
+ *
+ * Returns YAFFS_OK or YAFFS_FAIL.
+ */
+static int nandmtd1_test_prerequists(struct mtd_info *mtd)
+{
+        /* 2.6.18 has mtd->ecclayout->oobavail */
+        /* 2.6.21 has mtd->ecclayout->oobavail and mtd->oobavail */
+        int oobavail = mtd->ecclayout->oobavail;
+
+        if (oobavail < YTAG1_SIZE) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "mtd device has only %d bytes for tags, need %d",
+                        oobavail, YTAG1_SIZE);
+                return YAFFS_FAIL;
+        }
+        return YAFFS_OK;
+}
+
+/* Query for the current state of a specific block.
+ *
+ * Examine the tags of the first chunk of the block and return the state:
+ *  - YAFFS_BLOCK_STATE_DEAD, the block is marked bad
+ *  - YAFFS_BLOCK_STATE_NEEDS_SCANNING, the block is in use
+ *  - YAFFS_BLOCK_STATE_EMPTY, the block is clean
+ *
+ * Always returns YAFFS_OK.
+ */
+int nandmtd1_query_block(struct yaffs_dev *dev, int block_no,
+                         enum yaffs_block_state *state_ptr, u32 * seq_ptr)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+        int chunk_num = block_no * dev->param.chunks_per_block;
+        loff_t addr = (loff_t) chunk_num * dev->data_bytes_per_chunk;
+        struct yaffs_ext_tags etags;
+        int state = YAFFS_BLOCK_STATE_DEAD;
+        int seqnum = 0;
+        int retval;
+
+        /* We don't yet have a good place to test for MTD config prerequists.
+         * Do it here as we are called during the initial scan.
+         */
+        if (nandmtd1_test_prerequists(mtd) != YAFFS_OK)
+                return YAFFS_FAIL;
+
+        retval = nandmtd1_read_chunk_tags(dev, chunk_num, NULL, &etags);
+        etags.block_bad = (mtd->block_isbad) (mtd, addr);
+        if (etags.block_bad) {
+                yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+                        "block %d is marked bad", block_no);
+                state = YAFFS_BLOCK_STATE_DEAD;
+        } else if (etags.ecc_result != YAFFS_ECC_RESULT_NO_ERROR) {
+                /* bad tags, need to look more closely */
+                state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+        } else if (etags.chunk_used) {
+                state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+                seqnum = etags.seq_number;
+        } else {
+                state = YAFFS_BLOCK_STATE_EMPTY;
+        }
+
+        *state_ptr = state;
+        *seq_ptr = seqnum;
+
+        /* query always succeeds */
+        return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_mtdif1.h b/fs/yaffs2/yaffs_mtdif1.h
new file mode 100644
index 00000000000..07ce4524f0f
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif1.h
@@ -0,0 +1,29 @@
+/*
+ * YAFFS: Yet another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_MTDIF1_H__
+#define __YAFFS_MTDIF1_H__
+
+int nandmtd1_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+                              const u8 * data,
+                              const struct yaffs_ext_tags *tags);
+
+int nandmtd1_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+                             u8 * data, struct yaffs_ext_tags *tags);
+
+int nandmtd1_mark_block_bad(struct yaffs_dev *dev, int block_no);
+
+int nandmtd1_query_block(struct yaffs_dev *dev, int block_no,
+                         enum yaffs_block_state *state, u32 * seq_number);
+
+#endif
diff --git a/fs/yaffs2/yaffs_mtdif2.c b/fs/yaffs2/yaffs_mtdif2.c
new file mode 100644
index 00000000000..d1643df2c38
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif2.c
@@ -0,0 +1,225 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* mtd interface for YAFFS2 */
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_mtdif2.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+
+#include "yaffs_packedtags2.h"
+
+#include "yaffs_linux.h"
+
+/* NB For use with inband tags....
+ * We assume that the data buffer is of size total_bytes_per_chunk so that we can also
+ * use it to load the tags.
+ */
+int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+                              const u8 * data,
+                              const struct yaffs_ext_tags *tags)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+        struct mtd_oob_ops ops;
+        int retval = 0;
+
+        loff_t addr;
+
+        struct yaffs_packed_tags2 pt;
+
+        int packed_tags_size =
+            dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
+        void *packed_tags_ptr =
+            dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
+
+        yaffs_trace(YAFFS_TRACE_MTD,
+                "nandmtd2_write_chunk_tags chunk %d data %p tags %p",
+                nand_chunk, data, tags);
+
+        addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
+
+        /* For yaffs2 writing there must be both data and tags.
+         * If we're using inband tags, then the tags are stuffed into
+         * the end of the data buffer.
+         */
+        if (!data || !tags)
+                BUG();
+        else if (dev->param.inband_tags) {
+                struct yaffs_packed_tags2_tags_only *pt2tp;
+                pt2tp =
+                    (struct yaffs_packed_tags2_tags_only *)(data +
+                                                            dev->
+                                                            data_bytes_per_chunk);
+                yaffs_pack_tags2_tags_only(pt2tp, tags);
+        } else {
+                yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
+        }
+
+        ops.mode = MTD_OOB_AUTO;
+        ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
+        ops.len = dev->param.total_bytes_per_chunk;
+        ops.ooboffs = 0;
+        ops.datbuf = (u8 *) data;
+        ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
+        retval = mtd->write_oob(mtd, addr, &ops);
+
+        if (retval == 0)
+                return YAFFS_OK;
+        else
+                return YAFFS_FAIL;
+}
+
+int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+                             u8 * data, struct yaffs_ext_tags *tags)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+        struct mtd_oob_ops ops;
+
+        size_t dummy;
+        int retval = 0;
+        int local_data = 0;
+
+        loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
+
+        struct yaffs_packed_tags2 pt;
+
+        int packed_tags_size =
+            dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
+        void *packed_tags_ptr =
+            dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
+
+        yaffs_trace(YAFFS_TRACE_MTD,
+                "nandmtd2_read_chunk_tags chunk %d data %p tags %p",
+                nand_chunk, data, tags);
+
+        if (dev->param.inband_tags) {
+
+                if (!data) {
+                        local_data = 1;
+                        data = yaffs_get_temp_buffer(dev, __LINE__);
+                }
+
+        }
+
+        if (dev->param.inband_tags || (data && !tags))
+                retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
+                                   &dummy, data);
+        else if (tags) {
+                ops.mode = MTD_OOB_AUTO;
+                ops.ooblen = packed_tags_size;
+                ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
+                ops.ooboffs = 0;
+                ops.datbuf = data;
+                ops.oobbuf = yaffs_dev_to_lc(dev)->spare_buffer;
+                retval = mtd->read_oob(mtd, addr, &ops);
+        }
+
+        if (dev->param.inband_tags) {
+                if (tags) {
+                        struct yaffs_packed_tags2_tags_only *pt2tp;
+                        pt2tp =
+                            (struct yaffs_packed_tags2_tags_only *)&data[dev->
+                                                                         data_bytes_per_chunk];
+                        yaffs_unpack_tags2_tags_only(tags, pt2tp);
+                }
+        } else {
+                if (tags) {
+                        memcpy(packed_tags_ptr,
+                               yaffs_dev_to_lc(dev)->spare_buffer,
+                               packed_tags_size);
+                        yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
+                }
+        }
+
+        if (local_data)
+                yaffs_release_temp_buffer(dev, data, __LINE__);
+
+        if (tags && retval == -EBADMSG
+            && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
+                tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+                dev->n_ecc_unfixed++;
+        }
+        if (tags && retval == -EUCLEAN
+            && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
+                tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
+                dev->n_ecc_fixed++;
+        }
+        if (retval == 0)
+                return YAFFS_OK;
+        else
+                return YAFFS_FAIL;
+}
+
+int nandmtd2_mark_block_bad(struct yaffs_dev *dev, int block_no)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+        int retval;
+        yaffs_trace(YAFFS_TRACE_MTD,
+                "nandmtd2_mark_block_bad %d", block_no);
+
+        retval =
+            mtd->block_markbad(mtd,
+                               block_no * dev->param.chunks_per_block *
+                               dev->param.total_bytes_per_chunk);
+
+        if (retval == 0)
+                return YAFFS_OK;
+        else
+                return YAFFS_FAIL;
+
+}
+
+int nandmtd2_query_block(struct yaffs_dev *dev, int block_no,
+                         enum yaffs_block_state *state, u32 * seq_number)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+        int retval;
+
+        yaffs_trace(YAFFS_TRACE_MTD, "nandmtd2_query_block %d", block_no);
+        retval =
+            mtd->block_isbad(mtd,
+                             block_no * dev->param.chunks_per_block *
+                             dev->param.total_bytes_per_chunk);
+
+        if (retval) {
+                yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
+
+                *state = YAFFS_BLOCK_STATE_DEAD;
+                *seq_number = 0;
+        } else {
+                struct yaffs_ext_tags t;
+                nandmtd2_read_chunk_tags(dev, block_no *
+                                         dev->param.chunks_per_block, NULL, &t);
+
+                if (t.chunk_used) {
+                        *seq_number = t.seq_number;
+                        *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+                } else {
+                        *seq_number = 0;
+                        *state = YAFFS_BLOCK_STATE_EMPTY;
+                }
+        }
+        yaffs_trace(YAFFS_TRACE_MTD,
+                "block is bad seq %d state %d", *seq_number, *state);
+
+        if (retval == 0)
+                return YAFFS_OK;
+        else
+                return YAFFS_FAIL;
+}
+
diff --git a/fs/yaffs2/yaffs_mtdif2.h b/fs/yaffs2/yaffs_mtdif2.h
new file mode 100644
index 00000000000..d82112610d0
--- /dev/null
+++ b/fs/yaffs2/yaffs_mtdif2.h
@@ -0,0 +1,29 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_MTDIF2_H__
+#define __YAFFS_MTDIF2_H__
+
+#include "yaffs_guts.h"
+int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+                              const u8 * data,
+                              const struct yaffs_ext_tags *tags);
+int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
+                             u8 * data, struct yaffs_ext_tags *tags);
+int nandmtd2_mark_block_bad(struct yaffs_dev *dev, int block_no);
+int nandmtd2_query_block(struct yaffs_dev *dev, int block_no,
+                         enum yaffs_block_state *state, u32 * seq_number);
+
+#endif
diff --git a/fs/yaffs2/yaffs_nameval.c b/fs/yaffs2/yaffs_nameval.c
new file mode 100644
index 00000000000..daa36f989d3
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.c
@@ -0,0 +1,201 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This simple implementation of a name-value store assumes a small number of values and fits
+ * into a small finite buffer.
+ *
+ * Each attribute is stored as a record:
+ *  sizeof(int) bytes   record size.
+ *  strnlen+1 bytes name null terminated.
+ *  nbytes    value.
+ *  ----------
+ *  total size  stored in record size 
+ *
+ * This code has not been tested with unicode yet.
+ */
+
+#include "yaffs_nameval.h"
+
+#include "yportenv.h"
+
+static int nval_find(const char *xb, int xb_size, const YCHAR * name,
+                     int *exist_size)
+{
+        int pos = 0;
+        int size;
+
+        memcpy(&size, xb, sizeof(int));
+        while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+                if (strncmp
+                    ((YCHAR *) (xb + pos + sizeof(int)), name, size) == 0) {
+                        if (exist_size)
+                                *exist_size = size;
+                        return pos;
+                }
+                pos += size;
+                if (pos < xb_size - sizeof(int))
+                        memcpy(&size, xb + pos, sizeof(int));
+                else
+                        size = 0;
+        }
+        if (exist_size)
+                *exist_size = 0;
+        return -1;
+}
+
+static int nval_used(const char *xb, int xb_size)
+{
+        int pos = 0;
+        int size;
+
+        memcpy(&size, xb + pos, sizeof(int));
+        while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+                pos += size;
+                if (pos < xb_size - sizeof(int))
+                        memcpy(&size, xb + pos, sizeof(int));
+                else
+                        size = 0;
+        }
+        return pos;
+}
+
+int nval_del(char *xb, int xb_size, const YCHAR * name)
+{
+        int pos = nval_find(xb, xb_size, name, NULL);
+        int size;
+
+        if (pos >= 0 && pos < xb_size) {
+                /* Find size, shift rest over this record, then zero out the rest of buffer */
+                memcpy(&size, xb + pos, sizeof(int));
+                memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
+                memset(xb + (xb_size - size), 0, size);
+                return 0;
+        } else {
+                return -ENODATA;
+        }
+}
+
+int nval_set(char *xb, int xb_size, const YCHAR * name, const char *buf,
+             int bsize, int flags)
+{
+        int pos;
+        int namelen = strnlen(name, xb_size);
+        int reclen;
+        int size_exist = 0;
+        int space;
+        int start;
+
+        pos = nval_find(xb, xb_size, name, &size_exist);
+
+        if (flags & XATTR_CREATE && pos >= 0)
+                return -EEXIST;
+        if (flags & XATTR_REPLACE && pos < 0)
+                return -ENODATA;
+
+        start = nval_used(xb, xb_size);
+        space = xb_size - start + size_exist;
+
+        reclen = (sizeof(int) + namelen + 1 + bsize);
+
+        if (reclen > space)
+                return -ENOSPC;
+
+        if (pos >= 0) {
+                nval_del(xb, xb_size, name);
+                start = nval_used(xb, xb_size);
+        }
+
+        pos = start;
+
+        memcpy(xb + pos, &reclen, sizeof(int));
+        pos += sizeof(int);
+        strncpy((YCHAR *) (xb + pos), name, reclen);
+        pos += (namelen + 1);
+        memcpy(xb + pos, buf, bsize);
+        return 0;
+}
+
+int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
+             int bsize)
+{
+        int pos = nval_find(xb, xb_size, name, NULL);
+        int size;
+
+        if (pos >= 0 && pos < xb_size) {
+
+                memcpy(&size, xb + pos, sizeof(int));
+                pos += sizeof(int);     /* advance past record length */
+                size -= sizeof(int);
+
+                /* Advance over name string */
+                while (xb[pos] && size > 0 && pos < xb_size) {
+                        pos++;
+                        size--;
+                }
+                /*Advance over NUL */
+                pos++;
+                size--;
+
+                if (size <= bsize) {
+                        memcpy(buf, xb + pos, size);
+                        return size;
+                }
+
+        }
+        if (pos >= 0)
+                return -ERANGE;
+        else
+                return -ENODATA;
+}
+
+int nval_list(const char *xb, int xb_size, char *buf, int bsize)
+{
+        int pos = 0;
+        int size;
+        int name_len;
+        int ncopied = 0;
+        int filled = 0;
+
+        memcpy(&size, xb + pos, sizeof(int));
+        while (size > sizeof(int) && size <= xb_size && (pos + size) < xb_size
+               && !filled) {
+                pos += sizeof(int);
+                size -= sizeof(int);
+                name_len = strnlen((YCHAR *) (xb + pos), size);
+                if (ncopied + name_len + 1 < bsize) {
+                        memcpy(buf, xb + pos, name_len * sizeof(YCHAR));
+                        buf += name_len;
+                        *buf = '\0';
+                        buf++;
+                        if (sizeof(YCHAR) > 1) {
+                                *buf = '\0';
+                                buf++;
+                        }
+                        ncopied += (name_len + 1);
+                } else {
+                        filled = 1;
+                }
+                pos += size;
+                if (pos < xb_size - sizeof(int))
+                        memcpy(&size, xb + pos, sizeof(int));
+                else
+                        size = 0;
+        }
+        return ncopied;
+}
+
+int nval_hasvalues(const char *xb, int xb_size)
+{
+        return nval_used(xb, xb_size) > 0;
+}
diff --git a/fs/yaffs2/yaffs_nameval.h b/fs/yaffs2/yaffs_nameval.h
new file mode 100644
index 00000000000..2bb02b62762
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.h
@@ -0,0 +1,28 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __NAMEVAL_H__
+#define __NAMEVAL_H__
+
+#include "yportenv.h"
+
+int nval_del(char *xb, int xb_size, const YCHAR * name);
+int nval_set(char *xb, int xb_size, const YCHAR * name, const char *buf,
+             int bsize, int flags);
+int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
+             int bsize);
+int nval_list(const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(const char *xb, int xb_size);
+#endif
diff --git a/fs/yaffs2/yaffs_nand.c b/fs/yaffs2/yaffs_nand.c
new file mode 100644
index 00000000000..e816cabf43f
--- /dev/null
+++ b/fs/yaffs2/yaffs_nand.c
@@ -0,0 +1,127 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_nand.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_tagsvalidity.h"
+
+#include "yaffs_getblockinfo.h"
+
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+                             u8 * buffer, struct yaffs_ext_tags *tags)
+{
+        int result;
+        struct yaffs_ext_tags local_tags;
+
+        int realigned_chunk = nand_chunk - dev->chunk_offset;
+
+        dev->n_page_reads++;
+
+        /* If there are no tags provided, use local tags to get prioritised gc working */
+        if (!tags)
+                tags = &local_tags;
+
+        if (dev->param.read_chunk_tags_fn)
+                result =
+                    dev->param.read_chunk_tags_fn(dev, realigned_chunk, buffer,
+                                                  tags);
+        else
+                result = yaffs_tags_compat_rd(dev,
+                                              realigned_chunk, buffer, tags);
+        if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
+
+                struct yaffs_block_info *bi;
+                bi = yaffs_get_block_info(dev,
+                                          nand_chunk /
+                                          dev->param.chunks_per_block);
+                yaffs_handle_chunk_error(dev, bi);
+        }
+
+        return result;
+}
+
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+                             int nand_chunk,
+                             const u8 * buffer, struct yaffs_ext_tags *tags)
+{
+
+        dev->n_page_writes++;
+
+        nand_chunk -= dev->chunk_offset;
+
+        if (tags) {
+                tags->seq_number = dev->seq_number;
+                tags->chunk_used = 1;
+                if (!yaffs_validate_tags(tags)) {
+                        yaffs_trace(YAFFS_TRACE_ERROR, "Writing uninitialised tags");
+                        YBUG();
+                }
+                yaffs_trace(YAFFS_TRACE_WRITE,
+                        "Writing chunk %d tags %d %d",
+                        nand_chunk, tags->obj_id, tags->chunk_id);
+        } else {
+                yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
+                YBUG();
+        }
+
+        if (dev->param.write_chunk_tags_fn)
+                return dev->param.write_chunk_tags_fn(dev, nand_chunk, buffer,
+                                                      tags);
+        else
+                return yaffs_tags_compat_wr(dev, nand_chunk, buffer, tags);
+}
+
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
+{
+        block_no -= dev->block_offset;
+
+        if (dev->param.bad_block_fn)
+                return dev->param.bad_block_fn(dev, block_no);
+        else
+                return yaffs_tags_compat_mark_bad(dev, block_no);
+}
+
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+                                 int block_no,
+                                 enum yaffs_block_state *state,
+                                 u32 * seq_number)
+{
+        block_no -= dev->block_offset;
+
+        if (dev->param.query_block_fn)
+                return dev->param.query_block_fn(dev, block_no, state,
+                                                 seq_number);
+        else
+                return yaffs_tags_compat_query_block(dev, block_no,
+                                                     state, seq_number);
+}
+
+int yaffs_erase_block(struct yaffs_dev *dev, int flash_block)
+{
+        int result;
+
+        flash_block -= dev->block_offset;
+
+        dev->n_erasures++;
+
+        result = dev->param.erase_fn(dev, flash_block);
+
+        return result;
+}
+
+int yaffs_init_nand(struct yaffs_dev *dev)
+{
+        if (dev->param.initialise_flash_fn)
+                return dev->param.initialise_flash_fn(dev);
+        return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_nand.h b/fs/yaffs2/yaffs_nand.h
new file mode 100644
index 00000000000..543f1987124
--- /dev/null
+++ b/fs/yaffs2/yaffs_nand.h
@@ -0,0 +1,38 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_NAND_H__
+#define __YAFFS_NAND_H__
+#include "yaffs_guts.h"
+
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+                             u8 * buffer, struct yaffs_ext_tags *tags);
+
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+                             int nand_chunk,
+                             const u8 * buffer, struct yaffs_ext_tags *tags);
+
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no);
+
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+                                 int block_no,
+                                 enum yaffs_block_state *state,
+                                 unsigned *seq_number);
+
+int yaffs_erase_block(struct yaffs_dev *dev, int flash_block);
+
+int yaffs_init_nand(struct yaffs_dev *dev);
+
+#endif
diff --git a/fs/yaffs2/yaffs_packedtags1.c b/fs/yaffs2/yaffs_packedtags1.c
new file mode 100644
index 00000000000..a77f0954fc1
--- /dev/null
+++ b/fs/yaffs2/yaffs_packedtags1.c
@@ -0,0 +1,53 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_packedtags1.h"
+#include "yportenv.h"
+
+void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
+                      const struct yaffs_ext_tags *t)
+{
+        pt->chunk_id = t->chunk_id;
+        pt->serial_number = t->serial_number;
+        pt->n_bytes = t->n_bytes;
+        pt->obj_id = t->obj_id;
+        pt->ecc = 0;
+        pt->deleted = (t->is_deleted) ? 0 : 1;
+        pt->unused_stuff = 0;
+        pt->should_be_ff = 0xFFFFFFFF;
+
+}
+
+void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
+                        const struct yaffs_packed_tags1 *pt)
+{
+        static const u8 all_ff[] =
+            { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff
+        };
+
+        if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) {
+                t->block_bad = 0;
+                if (pt->should_be_ff != 0xFFFFFFFF)
+                        t->block_bad = 1;
+                t->chunk_used = 1;
+                t->obj_id = pt->obj_id;
+                t->chunk_id = pt->chunk_id;
+                t->n_bytes = pt->n_bytes;
+                t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+                t->is_deleted = (pt->deleted) ? 0 : 1;
+                t->serial_number = pt->serial_number;
+        } else {
+                memset(t, 0, sizeof(struct yaffs_ext_tags));
+        }
+}
diff --git a/fs/yaffs2/yaffs_packedtags1.h b/fs/yaffs2/yaffs_packedtags1.h
new file mode 100644
index 00000000000..d6861ff505e
--- /dev/null
+++ b/fs/yaffs2/yaffs_packedtags1.h
@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/* This is used to pack YAFFS1 tags, not YAFFS2 tags. */
+
+#ifndef __YAFFS_PACKEDTAGS1_H__
+#define __YAFFS_PACKEDTAGS1_H__
+
+#include "yaffs_guts.h"
+
+struct yaffs_packed_tags1 {
+        unsigned chunk_id:20;
+        unsigned serial_number:2;
+        unsigned n_bytes:10;
+        unsigned obj_id:18;
+        unsigned ecc:12;
+        unsigned deleted:1;
+        unsigned unused_stuff:1;
+        unsigned should_be_ff;
+
+};
+
+void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
+                      const struct yaffs_ext_tags *t);
+void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
+                        const struct yaffs_packed_tags1 *pt);
+#endif
diff --git a/fs/yaffs2/yaffs_packedtags2.c b/fs/yaffs2/yaffs_packedtags2.c
new file mode 100644
index 00000000000..8e7fea3d286
--- /dev/null
+++ b/fs/yaffs2/yaffs_packedtags2.c
@@ -0,0 +1,196 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_packedtags2.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_tagsvalidity.h"
+
+/* This code packs a set of extended tags into a binary structure for
+ * NAND storage
+ */
+
+/* Some of the information is "extra" struff which can be packed in to
+ * speed scanning
+ * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
+ */
+
+/* Extra flags applied to chunk_id */
+
+#define EXTRA_HEADER_INFO_FLAG  0x80000000
+#define EXTRA_SHRINK_FLAG       0x40000000
+#define EXTRA_SHADOWS_FLAG      0x20000000
+#define EXTRA_SPARE_FLAGS       0x10000000
+
+#define ALL_EXTRA_FLAGS         0xF0000000
+
+/* Also, the top 4 bits of the object Id are set to the object type. */
+#define EXTRA_OBJECT_TYPE_SHIFT (28)
+#define EXTRA_OBJECT_TYPE_MASK  ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
+
+static void yaffs_dump_packed_tags2_tags_only(const struct
+                                              yaffs_packed_tags2_tags_only *ptt)
+{
+        yaffs_trace(YAFFS_TRACE_MTD,
+                "packed tags obj %d chunk %d byte %d seq %d",
+                ptt->obj_id, ptt->chunk_id, ptt->n_bytes, ptt->seq_number);
+}
+
+static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt)
+{
+        yaffs_dump_packed_tags2_tags_only(&pt->t);
+}
+
+static void yaffs_dump_tags2(const struct yaffs_ext_tags *t)
+{
+        yaffs_trace(YAFFS_TRACE_MTD,
+                "ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d",
+                t->ecc_result, t->block_bad, t->chunk_used, t->obj_id,
+                t->chunk_id, t->n_bytes, t->is_deleted, t->serial_number,
+                t->seq_number);
+
+}
+
+void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *ptt,
+                                const struct yaffs_ext_tags *t)
+{
+        ptt->chunk_id = t->chunk_id;
+        ptt->seq_number = t->seq_number;
+        ptt->n_bytes = t->n_bytes;
+        ptt->obj_id = t->obj_id;
+
+        if (t->chunk_id == 0 && t->extra_available) {
+                /* Store the extra header info instead */
+                /* We save the parent object in the chunk_id */
+                ptt->chunk_id = EXTRA_HEADER_INFO_FLAG | t->extra_parent_id;
+                if (t->extra_is_shrink)
+                        ptt->chunk_id |= EXTRA_SHRINK_FLAG;
+                if (t->extra_shadows)
+                        ptt->chunk_id |= EXTRA_SHADOWS_FLAG;
+
+                ptt->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+                ptt->obj_id |= (t->extra_obj_type << EXTRA_OBJECT_TYPE_SHIFT);
+
+                if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+                        ptt->n_bytes = t->extra_equiv_id;
+                else if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
+                        ptt->n_bytes = t->extra_length;
+                else
+                        ptt->n_bytes = 0;
+        }
+
+        yaffs_dump_packed_tags2_tags_only(ptt);
+        yaffs_dump_tags2(t);
+}
+
+void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
+                      const struct yaffs_ext_tags *t, int tags_ecc)
+{
+        yaffs_pack_tags2_tags_only(&pt->t, t);
+
+        if (tags_ecc)
+                yaffs_ecc_calc_other((unsigned char *)&pt->t,
+                                     sizeof(struct
+                                            yaffs_packed_tags2_tags_only),
+                                     &pt->ecc);
+}
+
+void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
+                                  struct yaffs_packed_tags2_tags_only *ptt)
+{
+
+        memset(t, 0, sizeof(struct yaffs_ext_tags));
+
+        yaffs_init_tags(t);
+
+        if (ptt->seq_number != 0xFFFFFFFF) {
+                t->block_bad = 0;
+                t->chunk_used = 1;
+                t->obj_id = ptt->obj_id;
+                t->chunk_id = ptt->chunk_id;
+                t->n_bytes = ptt->n_bytes;
+                t->is_deleted = 0;
+                t->serial_number = 0;
+                t->seq_number = ptt->seq_number;
+
+                /* Do extra header info stuff */
+
+                if (ptt->chunk_id & EXTRA_HEADER_INFO_FLAG) {
+                        t->chunk_id = 0;
+                        t->n_bytes = 0;
+
+                        t->extra_available = 1;
+                        t->extra_parent_id =
+                            ptt->chunk_id & (~(ALL_EXTRA_FLAGS));
+                        t->extra_is_shrink =
+                            (ptt->chunk_id & EXTRA_SHRINK_FLAG) ? 1 : 0;
+                        t->extra_shadows =
+                            (ptt->chunk_id & EXTRA_SHADOWS_FLAG) ? 1 : 0;
+                        t->extra_obj_type =
+                            ptt->obj_id >> EXTRA_OBJECT_TYPE_SHIFT;
+                        t->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+
+                        if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+                                t->extra_equiv_id = ptt->n_bytes;
+                        else
+                                t->extra_length = ptt->n_bytes;
+                }
+        }
+
+        yaffs_dump_packed_tags2_tags_only(ptt);
+        yaffs_dump_tags2(t);
+
+}
+
+void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
+                        int tags_ecc)
+{
+
+        enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+        if (pt->t.seq_number != 0xFFFFFFFF && tags_ecc) {
+                /* Chunk is in use and we need to do ECC */
+
+                struct yaffs_ecc_other ecc;
+                int result;
+                yaffs_ecc_calc_other((unsigned char *)&pt->t,
+                                     sizeof(struct
+                                            yaffs_packed_tags2_tags_only),
+                                     &ecc);
+                result =
+                    yaffs_ecc_correct_other((unsigned char *)&pt->t,
+                                            sizeof(struct
+                                                   yaffs_packed_tags2_tags_only),
+                                            &pt->ecc, &ecc);
+                switch (result) {
+                case 0:
+                        ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+                        break;
+                case 1:
+                        ecc_result = YAFFS_ECC_RESULT_FIXED;
+                        break;
+                case -1:
+                        ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+                        break;
+                default:
+                        ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
+                }
+        }
+
+        yaffs_unpack_tags2_tags_only(t, &pt->t);
+
+        t->ecc_result = ecc_result;
+
+        yaffs_dump_packed_tags2(pt);
+        yaffs_dump_tags2(t);
+}
diff --git a/fs/yaffs2/yaffs_packedtags2.h b/fs/yaffs2/yaffs_packedtags2.h
new file mode 100644
index 00000000000..f3296697bc0
--- /dev/null
+++ b/fs/yaffs2/yaffs_packedtags2.h
@@ -0,0 +1,47 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/* This is used to pack YAFFS2 tags, not YAFFS1tags. */
+
+#ifndef __YAFFS_PACKEDTAGS2_H__
+#define __YAFFS_PACKEDTAGS2_H__
+
+#include "yaffs_guts.h"
+#include "yaffs_ecc.h"
+
+struct yaffs_packed_tags2_tags_only {
+        unsigned seq_number;
+        unsigned obj_id;
+        unsigned chunk_id;
+        unsigned n_bytes;
+};
+
+struct yaffs_packed_tags2 {
+        struct yaffs_packed_tags2_tags_only t;
+        struct yaffs_ecc_other ecc;
+};
+
+/* Full packed tags with ECC, used for oob tags */
+void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
+                      const struct yaffs_ext_tags *t, int tags_ecc);
+void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
+                        int tags_ecc);
+
+/* Only the tags part (no ECC for use with inband tags */
+void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *pt,
+                                const struct yaffs_ext_tags *t);
+void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
+                                  struct yaffs_packed_tags2_tags_only *pt);
+#endif
diff --git a/fs/yaffs2/yaffs_tagscompat.c b/fs/yaffs2/yaffs_tagscompat.c
new file mode 100644
index 00000000000..7578075d9ac
--- /dev/null
+++ b/fs/yaffs2/yaffs_tagscompat.c
@@ -0,0 +1,422 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_ecc.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_trace.h"
+
+static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
+
+
+/********** Tags ECC calculations  *********/
+
+void yaffs_calc_ecc(const u8 * data, struct yaffs_spare *spare)
+{
+        yaffs_ecc_cacl(data, spare->ecc1);
+        yaffs_ecc_cacl(&data[256], spare->ecc2);
+}
+
+void yaffs_calc_tags_ecc(struct yaffs_tags *tags)
+{
+        /* Calculate an ecc */
+
+        unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
+        unsigned i, j;
+        unsigned ecc = 0;
+        unsigned bit = 0;
+
+        tags->ecc = 0;
+
+        for (i = 0; i < 8; i++) {
+                for (j = 1; j & 0xff; j <<= 1) {
+                        bit++;
+                        if (b[i] & j)
+                                ecc ^= bit;
+                }
+        }
+
+        tags->ecc = ecc;
+
+}
+
+int yaffs_check_tags_ecc(struct yaffs_tags *tags)
+{
+        unsigned ecc = tags->ecc;
+
+        yaffs_calc_tags_ecc(tags);
+
+        ecc ^= tags->ecc;
+
+        if (ecc && ecc <= 64) {
+                /* TODO: Handle the failure better. Retire? */
+                unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
+
+                ecc--;
+
+                b[ecc / 8] ^= (1 << (ecc & 7));
+
+                /* Now recvalc the ecc */
+                yaffs_calc_tags_ecc(tags);
+
+                return 1;       /* recovered error */
+        } else if (ecc) {
+                /* Wierd ecc failure value */
+                /* TODO Need to do somethiong here */
+                return -1;      /* unrecovered error */
+        }
+
+        return 0;
+}
+
+/********** Tags **********/
+
+static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
+                                     struct yaffs_tags *tags_ptr)
+{
+        union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
+
+        yaffs_calc_tags_ecc(tags_ptr);
+
+        spare_ptr->tb0 = tu->as_bytes[0];
+        spare_ptr->tb1 = tu->as_bytes[1];
+        spare_ptr->tb2 = tu->as_bytes[2];
+        spare_ptr->tb3 = tu->as_bytes[3];
+        spare_ptr->tb4 = tu->as_bytes[4];
+        spare_ptr->tb5 = tu->as_bytes[5];
+        spare_ptr->tb6 = tu->as_bytes[6];
+        spare_ptr->tb7 = tu->as_bytes[7];
+}
+
+static void yaffs_get_tags_from_spare(struct yaffs_dev *dev,
+                                      struct yaffs_spare *spare_ptr,
+                                      struct yaffs_tags *tags_ptr)
+{
+        union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
+        int result;
+
+        tu->as_bytes[0] = spare_ptr->tb0;
+        tu->as_bytes[1] = spare_ptr->tb1;
+        tu->as_bytes[2] = spare_ptr->tb2;
+        tu->as_bytes[3] = spare_ptr->tb3;
+        tu->as_bytes[4] = spare_ptr->tb4;
+        tu->as_bytes[5] = spare_ptr->tb5;
+        tu->as_bytes[6] = spare_ptr->tb6;
+        tu->as_bytes[7] = spare_ptr->tb7;
+
+        result = yaffs_check_tags_ecc(tags_ptr);
+        if (result > 0)
+                dev->n_tags_ecc_fixed++;
+        else if (result < 0)
+                dev->n_tags_ecc_unfixed++;
+}
+
+static void yaffs_spare_init(struct yaffs_spare *spare)
+{
+        memset(spare, 0xFF, sizeof(struct yaffs_spare));
+}
+
+static int yaffs_wr_nand(struct yaffs_dev *dev,
+                         int nand_chunk, const u8 * data,
+                         struct yaffs_spare *spare)
+{
+        if (nand_chunk < dev->param.start_block * dev->param.chunks_per_block) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "**>> yaffs chunk %d is not valid",
+                        nand_chunk);
+                return YAFFS_FAIL;
+        }
+
+        return dev->param.write_chunk_fn(dev, nand_chunk, data, spare);
+}
+
+static int yaffs_rd_chunk_nand(struct yaffs_dev *dev,
+                               int nand_chunk,
+                               u8 * data,
+                               struct yaffs_spare *spare,
+                               enum yaffs_ecc_result *ecc_result,
+                               int correct_errors)
+{
+        int ret_val;
+        struct yaffs_spare local_spare;
+
+        if (!spare && data) {
+                /* If we don't have a real spare, then we use a local one. */
+                /* Need this for the calculation of the ecc */
+                spare = &local_spare;
+        }
+
+        if (!dev->param.use_nand_ecc) {
+                ret_val =
+                    dev->param.read_chunk_fn(dev, nand_chunk, data, spare);
+                if (data && correct_errors) {
+                        /* Do ECC correction */
+                        /* Todo handle any errors */
+                        int ecc_result1, ecc_result2;
+                        u8 calc_ecc[3];
+
+                        yaffs_ecc_cacl(data, calc_ecc);
+                        ecc_result1 =
+                            yaffs_ecc_correct(data, spare->ecc1, calc_ecc);
+                        yaffs_ecc_cacl(&data[256], calc_ecc);
+                        ecc_result2 =
+                            yaffs_ecc_correct(&data[256], spare->ecc2,
+                                              calc_ecc);
+
+                        if (ecc_result1 > 0) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        "**>>yaffs ecc error fix performed on chunk %d:0",
+                                        nand_chunk);
+                                dev->n_ecc_fixed++;
+                        } else if (ecc_result1 < 0) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        "**>>yaffs ecc error unfixed on chunk %d:0",
+                                        nand_chunk);
+                                dev->n_ecc_unfixed++;
+                        }
+
+                        if (ecc_result2 > 0) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        "**>>yaffs ecc error fix performed on chunk %d:1",
+                                        nand_chunk);
+                                dev->n_ecc_fixed++;
+                        } else if (ecc_result2 < 0) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        "**>>yaffs ecc error unfixed on chunk %d:1",
+                                        nand_chunk);
+                                dev->n_ecc_unfixed++;
+                        }
+
+                        if (ecc_result1 || ecc_result2) {
+                                /* We had a data problem on this page */
+                                yaffs_handle_rd_data_error(dev, nand_chunk);
+                        }
+
+                        if (ecc_result1 < 0 || ecc_result2 < 0)
+                                *ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+                        else if (ecc_result1 > 0 || ecc_result2 > 0)
+                                *ecc_result = YAFFS_ECC_RESULT_FIXED;
+                        else
+                                *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+                }
+        } else {
+                /* Must allocate enough memory for spare+2*sizeof(int) */
+                /* for ecc results from device. */
+                struct yaffs_nand_spare nspare;
+
+                memset(&nspare, 0, sizeof(nspare));
+
+                ret_val = dev->param.read_chunk_fn(dev, nand_chunk, data,
+                                                   (struct yaffs_spare *)
+                                                   &nspare);
+                memcpy(spare, &nspare, sizeof(struct yaffs_spare));
+                if (data && correct_errors) {
+                        if (nspare.eccres1 > 0) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        "**>>mtd ecc error fix performed on chunk %d:0",
+                                        nand_chunk);
+                        } else if (nspare.eccres1 < 0) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        "**>>mtd ecc error unfixed on chunk %d:0",
+                                        nand_chunk);
+                        }
+
+                        if (nspare.eccres2 > 0) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        "**>>mtd ecc error fix performed on chunk %d:1",
+                                        nand_chunk);
+                        } else if (nspare.eccres2 < 0) {
+                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                        "**>>mtd ecc error unfixed on chunk %d:1",
+                                        nand_chunk);
+                        }
+
+                        if (nspare.eccres1 || nspare.eccres2) {
+                                /* We had a data problem on this page */
+                                yaffs_handle_rd_data_error(dev, nand_chunk);
+                        }
+
+                        if (nspare.eccres1 < 0 || nspare.eccres2 < 0)
+                                *ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+                        else if (nspare.eccres1 > 0 || nspare.eccres2 > 0)
+                                *ecc_result = YAFFS_ECC_RESULT_FIXED;
+                        else
+                                *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+                }
+        }
+        return ret_val;
+}
+
+/*
+ * Functions for robustisizing
+ */
+
+static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk)
+{
+        int flash_block = nand_chunk / dev->param.chunks_per_block;
+
+        /* Mark the block for retirement */
+        yaffs_get_block_info(dev,
+                             flash_block + dev->block_offset)->needs_retiring =
+            1;
+        yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                "**>>Block %d marked for retirement",
+                flash_block);
+
+        /* TODO:
+         * Just do a garbage collection on the affected block
+         * then retire the block
+         * NB recursion
+         */
+}
+
+int yaffs_tags_compat_wr(struct yaffs_dev *dev,
+                         int nand_chunk,
+                         const u8 * data, const struct yaffs_ext_tags *ext_tags)
+{
+        struct yaffs_spare spare;
+        struct yaffs_tags tags;
+
+        yaffs_spare_init(&spare);
+
+        if (ext_tags->is_deleted)
+                spare.page_status = 0;
+        else {
+                tags.obj_id = ext_tags->obj_id;
+                tags.chunk_id = ext_tags->chunk_id;
+
+                tags.n_bytes_lsb = ext_tags->n_bytes & 0x3ff;
+
+                if (dev->data_bytes_per_chunk >= 1024)
+                        tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3;
+                else
+                        tags.n_bytes_msb = 3;
+
+                tags.serial_number = ext_tags->serial_number;
+
+                if (!dev->param.use_nand_ecc && data)
+                        yaffs_calc_ecc(data, &spare);
+
+                yaffs_load_tags_to_spare(&spare, &tags);
+
+        }
+
+        return yaffs_wr_nand(dev, nand_chunk, data, &spare);
+}
+
+int yaffs_tags_compat_rd(struct yaffs_dev *dev,
+                         int nand_chunk,
+                         u8 * data, struct yaffs_ext_tags *ext_tags)
+{
+
+        struct yaffs_spare spare;
+        struct yaffs_tags tags;
+        enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
+
+        static struct yaffs_spare spare_ff;
+        static int init;
+
+        if (!init) {
+                memset(&spare_ff, 0xFF, sizeof(spare_ff));
+                init = 1;
+        }
+
+        if (yaffs_rd_chunk_nand(dev, nand_chunk, data, &spare, &ecc_result, 1)) {
+                /* ext_tags may be NULL */
+                if (ext_tags) {
+
+                        int deleted =
+                            (hweight8(spare.page_status) < 7) ? 1 : 0;
+
+                        ext_tags->is_deleted = deleted;
+                        ext_tags->ecc_result = ecc_result;
+                        ext_tags->block_bad = 0;        /* We're reading it */
+                        /* therefore it is not a bad block */
+                        ext_tags->chunk_used =
+                            (memcmp(&spare_ff, &spare, sizeof(spare_ff)) !=
+                             0) ? 1 : 0;
+
+                        if (ext_tags->chunk_used) {
+                                yaffs_get_tags_from_spare(dev, &spare, &tags);
+
+                                ext_tags->obj_id = tags.obj_id;
+                                ext_tags->chunk_id = tags.chunk_id;
+                                ext_tags->n_bytes = tags.n_bytes_lsb;
+
+                                if (dev->data_bytes_per_chunk >= 1024)
+                                        ext_tags->n_bytes |=
+                                            (((unsigned)tags.
+                                              n_bytes_msb) << 10);
+
+                                ext_tags->serial_number = tags.serial_number;
+                        }
+                }
+
+                return YAFFS_OK;
+        } else {
+                return YAFFS_FAIL;
+        }
+}
+
+int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block)
+{
+
+        struct yaffs_spare spare;
+
+        memset(&spare, 0xff, sizeof(struct yaffs_spare));
+
+        spare.block_status = 'Y';
+
+        yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL,
+                      &spare);
+        yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1,
+                      NULL, &spare);
+
+        return YAFFS_OK;
+
+}
+
+int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
+                                  int block_no,
+                                  enum yaffs_block_state *state,
+                                  u32 * seq_number)
+{
+
+        struct yaffs_spare spare0, spare1;
+        static struct yaffs_spare spare_ff;
+        static int init;
+        enum yaffs_ecc_result dummy;
+
+        if (!init) {
+                memset(&spare_ff, 0xFF, sizeof(spare_ff));
+                init = 1;
+        }
+
+        *seq_number = 0;
+
+        yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block, NULL,
+                            &spare0, &dummy, 1);
+        yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1,
+                            NULL, &spare1, &dummy, 1);
+
+        if (hweight8(spare0.block_status & spare1.block_status) < 7)
+                *state = YAFFS_BLOCK_STATE_DEAD;
+        else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0)
+                *state = YAFFS_BLOCK_STATE_EMPTY;
+        else
+                *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+
+        return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_tagscompat.h b/fs/yaffs2/yaffs_tagscompat.h
new file mode 100644
index 00000000000..8cd35dcd3ca
--- /dev/null
+++ b/fs/yaffs2/yaffs_tagscompat.h
@@ -0,0 +1,36 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_TAGSCOMPAT_H__
+#define __YAFFS_TAGSCOMPAT_H__
+
+#include "yaffs_guts.h"
+int yaffs_tags_compat_wr(struct yaffs_dev *dev,
+                         int nand_chunk,
+                         const u8 * data, const struct yaffs_ext_tags *tags);
+int yaffs_tags_compat_rd(struct yaffs_dev *dev,
+                         int nand_chunk,
+                         u8 * data, struct yaffs_ext_tags *tags);
+int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no);
+int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
+                                  int block_no,
+                                  enum yaffs_block_state *state,
+                                  u32 * seq_number);
+
+void yaffs_calc_tags_ecc(struct yaffs_tags *tags);
+int yaffs_check_tags_ecc(struct yaffs_tags *tags);
+int yaffs_count_bits(u8 byte);
+
+#endif
diff --git a/fs/yaffs2/yaffs_tagsvalidity.c b/fs/yaffs2/yaffs_tagsvalidity.c
new file mode 100644
index 00000000000..4358d79d4be
--- /dev/null
+++ b/fs/yaffs2/yaffs_tagsvalidity.c
@@ -0,0 +1,27 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_tagsvalidity.h"
+
+void yaffs_init_tags(struct yaffs_ext_tags *tags)
+{
+        memset(tags, 0, sizeof(struct yaffs_ext_tags));
+        tags->validity0 = 0xAAAAAAAA;
+        tags->validity1 = 0x55555555;
+}
+
+int yaffs_validate_tags(struct yaffs_ext_tags *tags)
+{
+        return (tags->validity0 == 0xAAAAAAAA && tags->validity1 == 0x55555555);
+
+}
diff --git a/fs/yaffs2/yaffs_tagsvalidity.h b/fs/yaffs2/yaffs_tagsvalidity.h
new file mode 100644
index 00000000000..36a021fc8fa
--- /dev/null
+++ b/fs/yaffs2/yaffs_tagsvalidity.h
@@ -0,0 +1,23 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_TAGS_VALIDITY_H__
+#define __YAFFS_TAGS_VALIDITY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_init_tags(struct yaffs_ext_tags *tags);
+int yaffs_validate_tags(struct yaffs_ext_tags *tags);
+#endif
diff --git a/fs/yaffs2/yaffs_trace.h b/fs/yaffs2/yaffs_trace.h
new file mode 100644
index 00000000000..6273dbf9f63
--- /dev/null
+++ b/fs/yaffs2/yaffs_trace.h
@@ -0,0 +1,57 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YTRACE_H__
+#define __YTRACE_H__
+
+extern unsigned int yaffs_trace_mask;
+extern unsigned int yaffs_wr_attempts;
+
+/*
+ * Tracing flags.
+ * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
+ */
+
+#define YAFFS_TRACE_OS                  0x00000002
+#define YAFFS_TRACE_ALLOCATE            0x00000004
+#define YAFFS_TRACE_SCAN                0x00000008
+#define YAFFS_TRACE_BAD_BLOCKS          0x00000010
+#define YAFFS_TRACE_ERASE               0x00000020
+#define YAFFS_TRACE_GC                  0x00000040
+#define YAFFS_TRACE_WRITE               0x00000080
+#define YAFFS_TRACE_TRACING             0x00000100
+#define YAFFS_TRACE_DELETION            0x00000200
+#define YAFFS_TRACE_BUFFERS             0x00000400
+#define YAFFS_TRACE_NANDACCESS          0x00000800
+#define YAFFS_TRACE_GC_DETAIL           0x00001000
+#define YAFFS_TRACE_SCAN_DEBUG          0x00002000
+#define YAFFS_TRACE_MTD                 0x00004000
+#define YAFFS_TRACE_CHECKPOINT          0x00008000
+
+#define YAFFS_TRACE_VERIFY              0x00010000
+#define YAFFS_TRACE_VERIFY_NAND         0x00020000
+#define YAFFS_TRACE_VERIFY_FULL         0x00040000
+#define YAFFS_TRACE_VERIFY_ALL          0x000F0000
+
+#define YAFFS_TRACE_SYNC                0x00100000
+#define YAFFS_TRACE_BACKGROUND          0x00200000
+#define YAFFS_TRACE_LOCK                0x00400000
+#define YAFFS_TRACE_MOUNT               0x00800000
+
+#define YAFFS_TRACE_ERROR               0x40000000
+#define YAFFS_TRACE_BUG                 0x80000000
+#define YAFFS_TRACE_ALWAYS              0xF0000000
+
+#endif
diff --git a/fs/yaffs2/yaffs_verify.c b/fs/yaffs2/yaffs_verify.c
new file mode 100644
index 00000000000..738c7f69a5e
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.c
@@ -0,0 +1,535 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_verify.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+int yaffs_skip_verification(struct yaffs_dev *dev)
+{
+        dev = dev;
+        return !(yaffs_trace_mask &
+                 (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_skip_full_verification(struct yaffs_dev *dev)
+{
+        dev = dev;
+        return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
+{
+        dev = dev;
+        return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
+}
+
+static const char *block_state_name[] = {
+        "Unknown",
+        "Needs scanning",
+        "Scanning",
+        "Empty",
+        "Allocating",
+        "Full",
+        "Dirty",
+        "Checkpoint",
+        "Collecting",
+        "Dead"
+};
+
+void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n)
+{
+        int actually_used;
+        int in_use;
+
+        if (yaffs_skip_verification(dev))
+                return;
+
+        /* Report illegal runtime states */
+        if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES)
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Block %d has undefined state %d",
+                        n, bi->block_state);
+
+        switch (bi->block_state) {
+        case YAFFS_BLOCK_STATE_UNKNOWN:
+        case YAFFS_BLOCK_STATE_SCANNING:
+        case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Block %d has bad run-state %s",
+                        n, block_state_name[bi->block_state]);
+        }
+
+        /* Check pages in use and soft deletions are legal */
+
+        actually_used = bi->pages_in_use - bi->soft_del_pages;
+
+        if (bi->pages_in_use < 0
+            || bi->pages_in_use > dev->param.chunks_per_block
+            || bi->soft_del_pages < 0
+            || bi->soft_del_pages > dev->param.chunks_per_block
+            || actually_used < 0 || actually_used > dev->param.chunks_per_block)
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Block %d has illegal values pages_in_used %d soft_del_pages %d",
+                        n, bi->pages_in_use, bi->soft_del_pages);
+
+        /* Check chunk bitmap legal */
+        in_use = yaffs_count_chunk_bits(dev, n);
+        if (in_use != bi->pages_in_use)
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Block %d has inconsistent values pages_in_use %d counted chunk bits %d",
+                        n, bi->pages_in_use, in_use);
+
+}
+
+void yaffs_verify_collected_blk(struct yaffs_dev *dev,
+                                struct yaffs_block_info *bi, int n)
+{
+        yaffs_verify_blk(dev, bi, n);
+
+        /* After collection the block should be in the erased state */
+
+        if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING &&
+            bi->block_state != YAFFS_BLOCK_STATE_EMPTY) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "Block %d is in state %d after gc, should be erased",
+                        n, bi->block_state);
+        }
+}
+
+void yaffs_verify_blocks(struct yaffs_dev *dev)
+{
+        int i;
+        int state_count[YAFFS_NUMBER_OF_BLOCK_STATES];
+        int illegal_states = 0;
+
+        if (yaffs_skip_verification(dev))
+                return;
+
+        memset(state_count, 0, sizeof(state_count));
+
+        for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+                struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
+                yaffs_verify_blk(dev, bi, i);
+
+                if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
+                        state_count[bi->block_state]++;
+                else
+                        illegal_states++;
+        }
+
+        yaffs_trace(YAFFS_TRACE_VERIFY, "Block summary");
+
+        yaffs_trace(YAFFS_TRACE_VERIFY,
+                "%d blocks have illegal states",
+                illegal_states);
+        if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Too many allocating blocks");
+
+        for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "%s %d blocks",
+                        block_state_name[i], state_count[i]);
+
+        if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT])
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Checkpoint block count wrong dev %d count %d",
+                        dev->blocks_in_checkpt,
+                        state_count[YAFFS_BLOCK_STATE_CHECKPOINT]);
+
+        if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY])
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Erased block count wrong dev %d count %d",
+                        dev->n_erased_blocks,
+                        state_count[YAFFS_BLOCK_STATE_EMPTY]);
+
+        if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1)
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Too many collecting blocks %d (max is 1)",
+                        state_count[YAFFS_BLOCK_STATE_COLLECTING]);
+}
+
+/*
+ * Verify the object header. oh must be valid, but obj and tags may be NULL in which
+ * case those tests will not be performed.
+ */
+void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
+                     struct yaffs_ext_tags *tags, int parent_check)
+{
+        if (obj && yaffs_skip_verification(obj->my_dev))
+                return;
+
+        if (!(tags && obj && oh)) {
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Verifying object header tags %p obj %p oh %p",
+                        tags, obj, oh);
+                return;
+        }
+
+        if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
+            oh->type > YAFFS_OBJECT_TYPE_MAX)
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d header type is illegal value 0x%x",
+                        tags->obj_id, oh->type);
+
+        if (tags->obj_id != obj->obj_id)
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d header mismatch obj_id %d",
+                        tags->obj_id, obj->obj_id);
+
+        /*
+         * Check that the object's parent ids match if parent_check requested.
+         *
+         * Tests do not apply to the root object.
+         */
+
+        if (parent_check && tags->obj_id > 1 && !obj->parent)
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d header mismatch parent_id %d obj->parent is NULL",
+                        tags->obj_id, oh->parent_obj_id);
+
+        if (parent_check && obj->parent &&
+            oh->parent_obj_id != obj->parent->obj_id &&
+            (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
+             obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d header mismatch parent_id %d parent_obj_id %d",
+                        tags->obj_id, oh->parent_obj_id,
+                        obj->parent->obj_id);
+
+        if (tags->obj_id > 1 && oh->name[0] == 0)       /* Null name */
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d header name is NULL",
+                        obj->obj_id);
+
+        if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff)   /* Trashed name */
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d header name is 0xFF",
+                        obj->obj_id);
+}
+
+void yaffs_verify_file(struct yaffs_obj *obj)
+{
+        int required_depth;
+        int actual_depth;
+        u32 last_chunk;
+        u32 x;
+        u32 i;
+        struct yaffs_dev *dev;
+        struct yaffs_ext_tags tags;
+        struct yaffs_tnode *tn;
+        u32 obj_id;
+
+        if (!obj)
+                return;
+
+        if (yaffs_skip_verification(obj->my_dev))
+                return;
+
+        dev = obj->my_dev;
+        obj_id = obj->obj_id;
+
+        /* Check file size is consistent with tnode depth */
+        last_chunk =
+            obj->variant.file_variant.file_size / dev->data_bytes_per_chunk + 1;
+        x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS;
+        required_depth = 0;
+        while (x > 0) {
+                x >>= YAFFS_TNODES_INTERNAL_BITS;
+                required_depth++;
+        }
+
+        actual_depth = obj->variant.file_variant.top_level;
+
+        /* Check that the chunks in the tnode tree are all correct.
+         * We do this by scanning through the tnode tree and
+         * checking the tags for every chunk match.
+         */
+
+        if (yaffs_skip_nand_verification(dev))
+                return;
+
+        for (i = 1; i <= last_chunk; i++) {
+                tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);
+
+                if (tn) {
+                        u32 the_chunk = yaffs_get_group_base(dev, tn, i);
+                        if (the_chunk > 0) {
+                                yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
+                                                         &tags);
+                                if (tags.obj_id != obj_id || tags.chunk_id != i)
+                                yaffs_trace(YAFFS_TRACE_VERIFY,
+                                        "Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
+                                         obj_id, i, the_chunk,
+                                         tags.obj_id, tags.chunk_id);
+                        }
+                }
+        }
+}
+
+void yaffs_verify_link(struct yaffs_obj *obj)
+{
+        if (obj && yaffs_skip_verification(obj->my_dev))
+                return;
+
+        /* Verify sane equivalent object */
+}
+
+void yaffs_verify_symlink(struct yaffs_obj *obj)
+{
+        if (obj && yaffs_skip_verification(obj->my_dev))
+                return;
+
+        /* Verify symlink string */
+}
+
+void yaffs_verify_special(struct yaffs_obj *obj)
+{
+        if (obj && yaffs_skip_verification(obj->my_dev))
+                return;
+}
+
+void yaffs_verify_obj(struct yaffs_obj *obj)
+{
+        struct yaffs_dev *dev;
+
+        u32 chunk_min;
+        u32 chunk_max;
+
+        u32 chunk_id_ok;
+        u32 chunk_in_range;
+        u32 chunk_wrongly_deleted;
+        u32 chunk_valid;
+
+        if (!obj)
+                return;
+
+        if (obj->being_created)
+                return;
+
+        dev = obj->my_dev;
+
+        if (yaffs_skip_verification(dev))
+                return;
+
+        /* Check sane object header chunk */
+
+        chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
+        chunk_max =
+            (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;
+
+        chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
+                          ((unsigned)(obj->hdr_chunk)) <= chunk_max);
+        chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
+        chunk_valid = chunk_in_range &&
+            yaffs_check_chunk_bit(dev,
+                                  obj->hdr_chunk / dev->param.chunks_per_block,
+                                  obj->hdr_chunk % dev->param.chunks_per_block);
+        chunk_wrongly_deleted = chunk_in_range && !chunk_valid;
+
+        if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d has chunk_id %d %s %s",
+                        obj->obj_id, obj->hdr_chunk,
+                        chunk_id_ok ? "" : ",out of range",
+                        chunk_wrongly_deleted ? ",marked as deleted" : "");
+
+        if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
+                struct yaffs_ext_tags tags;
+                struct yaffs_obj_hdr *oh;
+                u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+                oh = (struct yaffs_obj_hdr *)buffer;
+
+                yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);
+
+                yaffs_verify_oh(obj, oh, &tags, 1);
+
+                yaffs_release_temp_buffer(dev, buffer, __LINE__);
+        }
+
+        /* Verify it has a parent */
+        if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d has parent pointer %p which does not look like an object",
+                        obj->obj_id, obj->parent);
+        }
+
+        /* Verify parent is a directory */
+        if (obj->parent
+            && obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d's parent is not a directory (type %d)",
+                        obj->obj_id, obj->parent->variant_type);
+        }
+
+        switch (obj->variant_type) {
+        case YAFFS_OBJECT_TYPE_FILE:
+                yaffs_verify_file(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_SYMLINK:
+                yaffs_verify_symlink(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_DIRECTORY:
+                yaffs_verify_dir(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_HARDLINK:
+                yaffs_verify_link(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_SPECIAL:
+                yaffs_verify_special(obj);
+                break;
+        case YAFFS_OBJECT_TYPE_UNKNOWN:
+        default:
+                yaffs_trace(YAFFS_TRACE_VERIFY,
+                        "Obj %d has illegaltype %d",
+                   obj->obj_id, obj->variant_type);
+                break;
+        }
+}
+
+void yaffs_verify_objects(struct yaffs_dev *dev)
+{
+        struct yaffs_obj *obj;
+        int i;
+        struct list_head *lh;
+
+        if (yaffs_skip_verification(dev))
+                return;
+
+        /* Iterate through the objects in each hash entry */
+
+        for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+                list_for_each(lh, &dev->obj_bucket[i].list) {
+                        if (lh) {
+                                obj =
+                                    list_entry(lh, struct yaffs_obj, hash_link);
+                                yaffs_verify_obj(obj);
+                        }
+                }
+        }
+}
+
+void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
+{
+        struct list_head *lh;
+        struct yaffs_obj *list_obj;
+
+        int count = 0;
+
+        if (!obj) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
+                YBUG();
+                return;
+        }
+
+        if (yaffs_skip_verification(obj->my_dev))
+                return;
+
+        if (!obj->parent) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent" );
+                YBUG();
+                return;
+        }
+
+        if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
+                YBUG();
+        }
+
+        /* Iterate through the objects in each hash entry */
+
+        list_for_each(lh, &obj->parent->variant.dir_variant.children) {
+                if (lh) {
+                        list_obj = list_entry(lh, struct yaffs_obj, siblings);
+                        yaffs_verify_obj(list_obj);
+                        if (obj == list_obj)
+                                count++;
+                }
+        }
+
+        if (count != 1) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "Object in directory %d times",
+                        count);
+                YBUG();
+        }
+}
+
+void yaffs_verify_dir(struct yaffs_obj *directory)
+{
+        struct list_head *lh;
+        struct yaffs_obj *list_obj;
+
+        if (!directory) {
+                YBUG();
+                return;
+        }
+
+        if (yaffs_skip_full_verification(directory->my_dev))
+                return;
+
+        if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "Directory has wrong type: %d",
+                        directory->variant_type);
+                YBUG();
+        }
+
+        /* Iterate through the objects in each hash entry */
+
+        list_for_each(lh, &directory->variant.dir_variant.children) {
+                if (lh) {
+                        list_obj = list_entry(lh, struct yaffs_obj, siblings);
+                        if (list_obj->parent != directory) {
+                                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                        "Object in directory list has wrong parent %p",
+                                        list_obj->parent);
+                                YBUG();
+                        }
+                        yaffs_verify_obj_in_dir(list_obj);
+                }
+        }
+}
+
+static int yaffs_free_verification_failures;
+
+void yaffs_verify_free_chunks(struct yaffs_dev *dev)
+{
+        int counted;
+        int difference;
+
+        if (yaffs_skip_verification(dev))
+                return;
+
+        counted = yaffs_count_free_chunks(dev);
+
+        difference = dev->n_free_chunks - counted;
+
+        if (difference) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "Freechunks verification failure %d %d %d",
+                        dev->n_free_chunks, counted, difference);
+                yaffs_free_verification_failures++;
+        }
+}
+
+int yaffs_verify_file_sane(struct yaffs_obj *in)
+{
+        in = in;
+        return YAFFS_OK;
+}
+
diff --git a/fs/yaffs2/yaffs_verify.h b/fs/yaffs2/yaffs_verify.h
new file mode 100644
index 00000000000..cc6f8899930
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.h
@@ -0,0 +1,43 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_VERIFY_H__
+#define __YAFFS_VERIFY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi,
+                      int n);
+void yaffs_verify_collected_blk(struct yaffs_dev *dev,
+                                struct yaffs_block_info *bi, int n);
+void yaffs_verify_blocks(struct yaffs_dev *dev);
+
+void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
+                     struct yaffs_ext_tags *tags, int parent_check);
+void yaffs_verify_file(struct yaffs_obj *obj);
+void yaffs_verify_link(struct yaffs_obj *obj);
+void yaffs_verify_symlink(struct yaffs_obj *obj);
+void yaffs_verify_special(struct yaffs_obj *obj);
+void yaffs_verify_obj(struct yaffs_obj *obj);
+void yaffs_verify_objects(struct yaffs_dev *dev);
+void yaffs_verify_obj_in_dir(struct yaffs_obj *obj);
+void yaffs_verify_dir(struct yaffs_obj *directory);
+void yaffs_verify_free_chunks(struct yaffs_dev *dev);
+
+int yaffs_verify_file_sane(struct yaffs_obj *obj);
+
+int yaffs_skip_verification(struct yaffs_dev *dev);
+
+#endif
diff --git a/fs/yaffs2/yaffs_vfs.c b/fs/yaffs2/yaffs_vfs.c
new file mode 100644
index 00000000000..d95875fe1e5
--- /dev/null
+++ b/fs/yaffs2/yaffs_vfs.c
@@ -0,0 +1,2790 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ * Acknowledgements:
+ * Luc van OostenRyck for numerous patches.
+ * Nick Bane for numerous patches.
+ * Nick Bane for 2.5/2.6 integration.
+ * Andras Toth for mknod rdev issue.
+ * Michael Fischer for finding the problem with inode inconsistency.
+ * Some code bodily lifted from JFFS
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ *
+ * This is the file system front-end to YAFFS that hooks it up to
+ * the VFS.
+ *
+ * Special notes:
+ * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
+ *         this superblock
+ * >> 2.6: sb->s_fs_info  points to the struct yaffs_dev associated with this
+ *         superblock
+ * >> inode->u.generic_ip points to the associated struct yaffs_obj.
+ */
+
+/*
+ * NB There are two variants of Linux VFS glue code. This variant supports
+ * a single version and should not include any multi-version code.
+ */
+#include <linux/version.h>
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/namei.h>
+#include <linux/exportfs.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#include <linux/freezer.h>
+
+#include <asm/div64.h>
+
+#include <linux/statfs.h>
+
+#define UnlockPage(p) unlock_page(p)
+#define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
+
+#define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
+
+#define YPROC_ROOT  NULL
+
+#define Y_INIT_TIMER(a) init_timer_on_stack(a)
+
+#define WRITE_SIZE_STR "writesize"
+#define WRITE_SIZE(mtd) ((mtd)->writesize)
+
+static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
+{
+        uint64_t result = partition_size;
+        do_div(result, block_size);
+        return (uint32_t) result;
+}
+
+#include <linux/uaccess.h>
+#include <linux/mtd/mtd.h>
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+#include "yaffs_attribs.h"
+
+#include "yaffs_linux.h"
+
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif1.h"
+#include "yaffs_mtdif2.h"
+
+unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
+unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
+unsigned int yaffs_auto_checkpoint = 1;
+unsigned int yaffs_gc_control = 1;
+unsigned int yaffs_bg_enable = 1;
+
+/* Module Parameters */
+module_param(yaffs_trace_mask, uint, 0644);
+module_param(yaffs_wr_attempts, uint, 0644);
+module_param(yaffs_auto_checkpoint, uint, 0644);
+module_param(yaffs_gc_control, uint, 0644);
+module_param(yaffs_bg_enable, uint, 0644);
+
+
+#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
+#define yaffs_inode_to_obj(iptr) ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
+#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
+#define yaffs_super_to_dev(sb)  ((struct yaffs_dev *)sb->s_fs_info)
+
+#define update_dir_time(dir) do {\
+                        (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
+                } while(0)
+
+
+static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
+{
+        return yaffs_gc_control;
+}
+
+static void yaffs_gross_lock(struct yaffs_dev *dev)
+{
+        yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
+        mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
+        yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
+}
+
+static void yaffs_gross_unlock(struct yaffs_dev *dev)
+{
+        yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
+        mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
+}
+
+static void yaffs_fill_inode_from_obj(struct inode *inode,
+                                      struct yaffs_obj *obj);
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
+{
+        struct inode *inode;
+        struct yaffs_obj *obj;
+        struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
+
+        inode = iget_locked(sb, ino);
+        if (!inode)
+                return ERR_PTR(-ENOMEM);
+        if (!(inode->i_state & I_NEW))
+                return inode;
+
+        /* NB This is called as a side effect of other functions, but
+         * we had to release the lock to prevent deadlocks, so
+         * need to lock again.
+         */
+
+        yaffs_gross_lock(dev);
+
+        obj = yaffs_find_by_number(dev, inode->i_ino);
+
+        yaffs_fill_inode_from_obj(inode, obj);
+
+        yaffs_gross_unlock(dev);
+
+        unlock_new_inode(inode);
+        return inode;
+}
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+                              struct yaffs_obj *obj)
+{
+        struct inode *inode;
+
+        if (!sb) {
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_get_inode for NULL super_block!!");
+                return NULL;
+
+        }
+
+        if (!obj) {
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_get_inode for NULL object!!");
+                return NULL;
+
+        }
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_get_inode for object %d",
+                obj->obj_id);
+
+        inode = yaffs_iget(sb, obj->obj_id);
+        if (IS_ERR(inode))
+                return NULL;
+
+        /* NB Side effect: iget calls back to yaffs_read_inode(). */
+        /* iget also increments the inode's i_count */
+        /* NB You can't be holding gross_lock or deadlock will happen! */
+
+        return inode;
+}
+
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+                       dev_t rdev)
+{
+        struct inode *inode;
+
+        struct yaffs_obj *obj = NULL;
+        struct yaffs_dev *dev;
+
+        struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
+
+        int error = -ENOSPC;
+        uid_t uid = current->cred->fsuid;
+        gid_t gid =
+            (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
+
+        if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
+                mode |= S_ISGID;
+
+        if (parent) {
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_mknod: parent object %d type %d",
+                        parent->obj_id, parent->variant_type);
+        } else {
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_mknod: could not get parent object");
+                return -EPERM;
+        }
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_mknod: making oject for %s, mode %x dev %x",
+                dentry->d_name.name, mode, rdev);
+
+        dev = parent->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        switch (mode & S_IFMT) {
+        default:
+                /* Special (socket, fifo, device...) */
+                yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
+                obj =
+                    yaffs_create_special(parent, dentry->d_name.name, mode, uid,
+                                         gid, old_encode_dev(rdev));
+                break;
+        case S_IFREG:           /* file          */
+                yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
+                obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
+                                        gid);
+                break;
+        case S_IFDIR:           /* directory */
+                yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
+                obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
+                                       uid, gid);
+                break;
+        case S_IFLNK:           /* symlink */
+                yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
+                obj = NULL;     /* Do we ever get here? */
+                break;
+        }
+
+        /* Can not call yaffs_get_inode() with gross lock held */
+        yaffs_gross_unlock(dev);
+
+        if (obj) {
+                inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+                d_instantiate(dentry, inode);
+                update_dir_time(dir);
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_mknod created object %d count = %d",
+                        obj->obj_id, atomic_read(&inode->i_count));
+                error = 0;
+                yaffs_fill_inode_from_obj(dir, parent);
+        } else {
+                yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
+                error = -ENOMEM;
+        }
+
+        return error;
+}
+
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+        return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+}
+
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+                        struct nameidata *n)
+{
+        return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+}
+
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+                      struct dentry *dentry)
+{
+        struct inode *inode = old_dentry->d_inode;
+        struct yaffs_obj *obj = NULL;
+        struct yaffs_obj *link = NULL;
+        struct yaffs_dev *dev;
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
+
+        obj = yaffs_inode_to_obj(inode);
+        dev = obj->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
+                link =
+                    yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
+                                   obj);
+
+        if (link) {
+                old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
+                d_instantiate(dentry, old_dentry->d_inode);
+                atomic_inc(&old_dentry->d_inode->i_count);
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_link link count %d i_count %d",
+                        old_dentry->d_inode->i_nlink,
+                        atomic_read(&old_dentry->d_inode->i_count));
+        }
+
+        yaffs_gross_unlock(dev);
+
+        if (link) {
+                update_dir_time(dir);
+                return 0;
+        }
+
+        return -EPERM;
+}
+
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+                         const char *symname)
+{
+        struct yaffs_obj *obj;
+        struct yaffs_dev *dev;
+        uid_t uid = current->cred->fsuid;
+        gid_t gid =
+            (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
+
+        dev = yaffs_inode_to_obj(dir)->my_dev;
+        yaffs_gross_lock(dev);
+        obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
+                                   S_IFLNK | S_IRWXUGO, uid, gid, symname);
+        yaffs_gross_unlock(dev);
+
+        if (obj) {
+                struct inode *inode;
+
+                inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+                d_instantiate(dentry, inode);
+                update_dir_time(dir);
+                yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
+                return 0;
+        } else {
+                yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
+        }
+
+        return -ENOMEM;
+}
+
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+                                   struct nameidata *n)
+{
+        struct yaffs_obj *obj;
+        struct inode *inode = NULL;
+
+        struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
+
+        if (current != yaffs_dev_to_lc(dev)->readdir_process)
+                yaffs_gross_lock(dev);
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_lookup for %d:%s",
+                yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
+
+        obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
+
+        obj = yaffs_get_equivalent_obj(obj);    /* in case it was a hardlink */
+
+        /* Can't hold gross lock when calling yaffs_get_inode() */
+        if (current != yaffs_dev_to_lc(dev)->readdir_process)
+                yaffs_gross_unlock(dev);
+
+        if (obj) {
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_lookup found %d", obj->obj_id);
+
+                inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+
+                if (inode) {
+                        yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry");
+                        d_add(dentry, inode);
+                        /* return dentry; */
+                        return NULL;
+                }
+
+        } else {
+                yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
+
+        }
+
+        d_add(dentry, inode);
+
+        return NULL;
+}
+
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
+{
+        int ret_val;
+
+        struct yaffs_dev *dev;
+        struct yaffs_obj *obj;
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_unlink %d:%s",
+                (int)(dir->i_ino), dentry->d_name.name);
+        obj = yaffs_inode_to_obj(dir);
+        dev = obj->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        ret_val = yaffs_unlinker(obj, dentry->d_name.name);
+
+        if (ret_val == YAFFS_OK) {
+                dentry->d_inode->i_nlink--;
+                dir->i_version++;
+                yaffs_gross_unlock(dev);
+                mark_inode_dirty(dentry->d_inode);
+                update_dir_time(dir);
+                return 0;
+        }
+        yaffs_gross_unlock(dev);
+        return -ENOTEMPTY;
+}
+
+static int yaffs_sync_object(struct file *file, int datasync)
+{
+
+        struct yaffs_obj *obj;
+        struct yaffs_dev *dev;
+        struct dentry *dentry = file->f_path.dentry;
+
+        obj = yaffs_dentry_to_obj(dentry);
+
+        dev = obj->my_dev;
+
+        yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, "yaffs_sync_object");
+        yaffs_gross_lock(dev);
+        yaffs_flush_file(obj, 1, datasync);
+        yaffs_gross_unlock(dev);
+        return 0;
+}
+/*
+ * The VFS layer already does all the dentry stuff for rename.
+ *
+ * NB: POSIX says you can rename an object over an old object of the same name
+ */
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+                        struct inode *new_dir, struct dentry *new_dentry)
+{
+        struct yaffs_dev *dev;
+        int ret_val = YAFFS_FAIL;
+        struct yaffs_obj *target;
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
+        dev = yaffs_inode_to_obj(old_dir)->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        /* Check if the target is an existing directory that is not empty. */
+        target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
+                                    new_dentry->d_name.name);
+
+        if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
+            !list_empty(&target->variant.dir_variant.children)) {
+
+                yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
+
+                ret_val = YAFFS_FAIL;
+        } else {
+                /* Now does unlinking internally using shadowing mechanism */
+                yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
+
+                ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
+                                           old_dentry->d_name.name,
+                                           yaffs_inode_to_obj(new_dir),
+                                           new_dentry->d_name.name);
+        }
+        yaffs_gross_unlock(dev);
+
+        if (ret_val == YAFFS_OK) {
+                if (target) {
+                        new_dentry->d_inode->i_nlink--;
+                        mark_inode_dirty(new_dentry->d_inode);
+                }
+
+                update_dir_time(old_dir);
+                if (old_dir != new_dir)
+                        update_dir_time(new_dir);
+                return 0;
+        } else {
+                return -ENOTEMPTY;
+        }
+}
+
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+        struct inode *inode = dentry->d_inode;
+        int error = 0;
+        struct yaffs_dev *dev;
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_setattr of object %d",
+                yaffs_inode_to_obj(inode)->obj_id);
+
+        /* Fail if a requested resize >= 2GB */
+        if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
+                error = -EINVAL;
+
+        if (error == 0)
+                error = inode_change_ok(inode, attr);
+        if (error == 0) {
+                int result;
+                if (!error) {
+                        setattr_copy(inode, attr);
+                        yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
+                        if (attr->ia_valid & ATTR_SIZE) {
+                                truncate_setsize(inode, attr->ia_size);
+                                inode->i_blocks = (inode->i_size + 511) >> 9;
+                        }
+                }
+                dev = yaffs_inode_to_obj(inode)->my_dev;
+                if (attr->ia_valid & ATTR_SIZE) {
+                        yaffs_trace(YAFFS_TRACE_OS, "resize to %d(%x)",
+                                           (int)(attr->ia_size),
+                                           (int)(attr->ia_size));
+                }
+                yaffs_gross_lock(dev);
+                result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
+                if (result == YAFFS_OK) {
+                        error = 0;
+                } else {
+                        error = -EPERM;
+                }
+                yaffs_gross_unlock(dev);
+
+        }
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
+
+        return error;
+}
+
+#ifdef CONFIG_YAFFS_XATTR
+static int yaffs_setxattr(struct dentry *dentry, const char *name,
+                   const void *value, size_t size, int flags)
+{
+        struct inode *inode = dentry->d_inode;
+        int error = 0;
+        struct yaffs_dev *dev;
+        struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
+
+        if (error == 0) {
+                int result;
+                dev = obj->my_dev;
+                yaffs_gross_lock(dev);
+                result = yaffs_set_xattrib(obj, name, value, size, flags);
+                if (result == YAFFS_OK)
+                        error = 0;
+                else if (result < 0)
+                        error = result;
+                yaffs_gross_unlock(dev);
+
+        }
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
+
+        return error;
+}
+
+static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name, void *buff,
+                       size_t size)
+{
+        struct inode *inode = dentry->d_inode;
+        int error = 0;
+        struct yaffs_dev *dev;
+        struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_getxattr \"%s\" from object %d",
+                name, obj->obj_id);
+
+        if (error == 0) {
+                dev = obj->my_dev;
+                yaffs_gross_lock(dev);
+                error = yaffs_get_xattrib(obj, name, buff, size);
+                yaffs_gross_unlock(dev);
+
+        }
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
+
+        return error;
+}
+
+static int yaffs_removexattr(struct dentry *dentry, const char *name)
+{
+        struct inode *inode = dentry->d_inode;
+        int error = 0;
+        struct yaffs_dev *dev;
+        struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_removexattr of object %d", obj->obj_id);
+
+        if (error == 0) {
+                int result;
+                dev = obj->my_dev;
+                yaffs_gross_lock(dev);
+                result = yaffs_remove_xattrib(obj, name);
+                if (result == YAFFS_OK)
+                        error = 0;
+                else if (result < 0)
+                        error = result;
+                yaffs_gross_unlock(dev);
+
+        }
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_removexattr done returning %d", error);
+
+        return error;
+}
+
+static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
+{
+        struct inode *inode = dentry->d_inode;
+        int error = 0;
+        struct yaffs_dev *dev;
+        struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_listxattr of object %d", obj->obj_id);
+
+        if (error == 0) {
+                dev = obj->my_dev;
+                yaffs_gross_lock(dev);
+                error = yaffs_list_xattrib(obj, buff, size);
+                yaffs_gross_unlock(dev);
+
+        }
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_listxattr done returning %d", error);
+
+        return error;
+}
+
+#endif
+
+static const struct inode_operations yaffs_dir_inode_operations = {
+        .create = yaffs_create,
+        .lookup = yaffs_lookup,
+        .link = yaffs_link,
+        .unlink = yaffs_unlink,
+        .symlink = yaffs_symlink,
+        .mkdir = yaffs_mkdir,
+        .rmdir = yaffs_unlink,
+        .mknod = yaffs_mknod,
+        .rename = yaffs_rename,
+        .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+        .setxattr = yaffs_setxattr,
+        .getxattr = yaffs_getxattr,
+        .listxattr = yaffs_listxattr,
+        .removexattr = yaffs_removexattr,
+#endif
+};
+/*-----------------------------------------------------------------*/
+/* Directory search context allows us to unlock access to yaffs during
+ * filldir without causing problems with the directory being modified.
+ * This is similar to the tried and tested mechanism used in yaffs direct.
+ *
+ * A search context iterates along a doubly linked list of siblings in the
+ * directory. If the iterating object is deleted then this would corrupt
+ * the list iteration, likely causing a crash. The search context avoids
+ * this by using the remove_obj_fn to move the search context to the
+ * next object before the object is deleted.
+ *
+ * Many readdirs (and thus seach conexts) may be alive simulateously so
+ * each struct yaffs_dev has a list of these.
+ *
+ * A seach context lives for the duration of a readdir.
+ *
+ * All these functions must be called while yaffs is locked.
+ */
+
+struct yaffs_search_context {
+        struct yaffs_dev *dev;
+        struct yaffs_obj *dir_obj;
+        struct yaffs_obj *next_return;
+        struct list_head others;
+};
+
+/*
+ * yaffs_new_search() creates a new search context, initialises it and
+ * adds it to the device's search context list.
+ *
+ * Called at start of readdir.
+ */
+static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
+{
+        struct yaffs_dev *dev = dir->my_dev;
+        struct yaffs_search_context *sc =
+            kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
+        if (sc) {
+                sc->dir_obj = dir;
+                sc->dev = dev;
+                if (list_empty(&sc->dir_obj->variant.dir_variant.children))
+                        sc->next_return = NULL;
+                else
+                        sc->next_return =
+                            list_entry(dir->variant.dir_variant.children.next,
+                                       struct yaffs_obj, siblings);
+                INIT_LIST_HEAD(&sc->others);
+                list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
+        }
+        return sc;
+}
+
+/*
+ * yaffs_search_end() disposes of a search context and cleans up.
+ */
+static void yaffs_search_end(struct yaffs_search_context *sc)
+{
+        if (sc) {
+                list_del(&sc->others);
+                kfree(sc);
+        }
+}
+
+/*
+ * yaffs_search_advance() moves a search context to the next object.
+ * Called when the search iterates or when an object removal causes
+ * the search context to be moved to the next object.
+ */
+static void yaffs_search_advance(struct yaffs_search_context *sc)
+{
+        if (!sc)
+                return;
+
+        if (sc->next_return == NULL ||
+            list_empty(&sc->dir_obj->variant.dir_variant.children))
+                sc->next_return = NULL;
+        else {
+                struct list_head *next = sc->next_return->siblings.next;
+
+                if (next == &sc->dir_obj->variant.dir_variant.children)
+                        sc->next_return = NULL; /* end of list */
+                else
+                        sc->next_return =
+                            list_entry(next, struct yaffs_obj, siblings);
+        }
+}
+
+/*
+ * yaffs_remove_obj_callback() is called when an object is unlinked.
+ * We check open search contexts and advance any which are currently
+ * on the object being iterated.
+ */
+static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
+{
+
+        struct list_head *i;
+        struct yaffs_search_context *sc;
+        struct list_head *search_contexts =
+            &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
+
+        /* Iterate through the directory search contexts.
+         * If any are currently on the object being removed, then advance
+         * the search context to the next object to prevent a hanging pointer.
+         */
+        list_for_each(i, search_contexts) {
+                if (i) {
+                        sc = list_entry(i, struct yaffs_search_context, others);
+                        if (sc->next_return == obj)
+                                yaffs_search_advance(sc);
+                }
+        }
+
+}
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
+{
+        struct yaffs_obj *obj;
+        struct yaffs_dev *dev;
+        struct yaffs_search_context *sc;
+        struct inode *inode = f->f_dentry->d_inode;
+        unsigned long offset, curoffs;
+        struct yaffs_obj *l;
+        int ret_val = 0;
+
+        char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+        obj = yaffs_dentry_to_obj(f->f_dentry);
+        dev = obj->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        yaffs_dev_to_lc(dev)->readdir_process = current;
+
+        offset = f->f_pos;
+
+        sc = yaffs_new_search(obj);
+        if (!sc) {
+                ret_val = -ENOMEM;
+                goto out;
+        }
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_readdir: starting at %d", (int)offset);
+
+        if (offset == 0) {
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_readdir: entry . ino %d",
+                        (int)inode->i_ino);
+                yaffs_gross_unlock(dev);
+                if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
+                        yaffs_gross_lock(dev);
+                        goto out;
+                }
+                yaffs_gross_lock(dev);
+                offset++;
+                f->f_pos++;
+        }
+        if (offset == 1) {
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_readdir: entry .. ino %d",
+                        (int)f->f_dentry->d_parent->d_inode->i_ino);
+                yaffs_gross_unlock(dev);
+                if (filldir(dirent, "..", 2, offset,
+                            f->f_dentry->d_parent->d_inode->i_ino,
+                            DT_DIR) < 0) {
+                        yaffs_gross_lock(dev);
+                        goto out;
+                }
+                yaffs_gross_lock(dev);
+                offset++;
+                f->f_pos++;
+        }
+
+        curoffs = 1;
+
+        /* If the directory has changed since the open or last call to
+           readdir, rewind to after the 2 canned entries. */
+        if (f->f_version != inode->i_version) {
+                offset = 2;
+                f->f_pos = offset;
+                f->f_version = inode->i_version;
+        }
+
+        while (sc->next_return) {
+                curoffs++;
+                l = sc->next_return;
+                if (curoffs >= offset) {
+                        int this_inode = yaffs_get_obj_inode(l);
+                        int this_type = yaffs_get_obj_type(l);
+
+                        yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
+                        yaffs_trace(YAFFS_TRACE_OS,
+                                "yaffs_readdir: %s inode %d",
+                                name, yaffs_get_obj_inode(l));
+
+                        yaffs_gross_unlock(dev);
+
+                        if (filldir(dirent,
+                                    name,
+                                    strlen(name),
+                                    offset, this_inode, this_type) < 0) {
+                                yaffs_gross_lock(dev);
+                                goto out;
+                        }
+
+                        yaffs_gross_lock(dev);
+
+                        offset++;
+                        f->f_pos++;
+                }
+                yaffs_search_advance(sc);
+        }
+
+out:
+        yaffs_search_end(sc);
+        yaffs_dev_to_lc(dev)->readdir_process = NULL;
+        yaffs_gross_unlock(dev);
+
+        return ret_val;
+}
+
+static const struct file_operations yaffs_dir_operations = {
+        .read = generic_read_dir,
+        .readdir = yaffs_readdir,
+        .fsync = yaffs_sync_object,
+        .llseek = generic_file_llseek,
+};
+
+
+
+static int yaffs_file_flush(struct file *file, fl_owner_t id)
+{
+        struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
+
+        struct yaffs_dev *dev = obj->my_dev;
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_file_flush object %d (%s)",
+                obj->obj_id, obj->dirty ? "dirty" : "clean");
+
+        yaffs_gross_lock(dev);
+
+        yaffs_flush_file(obj, 1, 0);
+
+        yaffs_gross_unlock(dev);
+
+        return 0;
+}
+
+static const struct file_operations yaffs_file_operations = {
+        .read = do_sync_read,
+        .write = do_sync_write,
+        .aio_read = generic_file_aio_read,
+        .aio_write = generic_file_aio_write,
+        .mmap = generic_file_mmap,
+        .flush = yaffs_file_flush,
+        .fsync = yaffs_sync_object,
+        .splice_read = generic_file_splice_read,
+        .splice_write = generic_file_splice_write,
+        .llseek = generic_file_llseek,
+};
+
+
+/* ExportFS support */
+static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
+                                          uint32_t generation)
+{
+        return yaffs_iget(sb, ino);
+}
+
+static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
+                                          struct fid *fid, int fh_len,
+                                          int fh_type)
+{
+        return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+                                    yaffs2_nfs_get_inode);
+}
+
+static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
+                                          struct fid *fid, int fh_len,
+                                          int fh_type)
+{
+        return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+                                    yaffs2_nfs_get_inode);
+}
+
+struct dentry *yaffs2_get_parent(struct dentry *dentry)
+{
+
+        struct super_block *sb = dentry->d_inode->i_sb;
+        struct dentry *parent = ERR_PTR(-ENOENT);
+        struct inode *inode;
+        unsigned long parent_ino;
+        struct yaffs_obj *d_obj;
+        struct yaffs_obj *parent_obj;
+
+        d_obj = yaffs_inode_to_obj(dentry->d_inode);
+
+        if (d_obj) {
+                parent_obj = d_obj->parent;
+                if (parent_obj) {
+                        parent_ino = yaffs_get_obj_inode(parent_obj);
+                        inode = yaffs_iget(sb, parent_ino);
+
+                        if (IS_ERR(inode)) {
+                                parent = ERR_CAST(inode);
+                        } else {
+                                parent = d_obtain_alias(inode);
+                                if (!IS_ERR(parent)) {
+                                        parent = ERR_PTR(-ENOMEM);
+                                        iput(inode);
+                                }
+                        }
+                }
+        }
+
+        return parent;
+}
+
+/* Just declare a zero structure as a NULL value implies
+ * using the default functions of exportfs.
+ */
+
+static struct export_operations yaffs_export_ops = {
+        .fh_to_dentry = yaffs2_fh_to_dentry,
+        .fh_to_parent = yaffs2_fh_to_parent,
+        .get_parent = yaffs2_get_parent,
+};
+
+
+/*-----------------------------------------------------------------*/
+
+static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
+                          int buflen)
+{
+        unsigned char *alias;
+        int ret;
+
+        struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+
+        yaffs_gross_unlock(dev);
+
+        if (!alias)
+                return -ENOMEM;
+
+        ret = vfs_readlink(dentry, buffer, buflen, alias);
+        kfree(alias);
+        return ret;
+}
+
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+        unsigned char *alias;
+        void *ret;
+        struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+        yaffs_gross_unlock(dev);
+
+        if (!alias) {
+                ret = ERR_PTR(-ENOMEM);
+                goto out;
+        }
+
+        nd_set_link(nd, alias);
+        ret = (void *)alias;
+out:
+        return ret;
+}
+
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
+{
+        kfree(alias);
+}
+
+
+static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
+{
+        /* Clear the association between the inode and
+         * the struct yaffs_obj.
+         */
+        obj->my_inode = NULL;
+        yaffs_inode_to_obj_lv(inode) = NULL;
+
+        /* If the object freeing was deferred, then the real
+         * free happens now.
+         * This should fix the inode inconsistency problem.
+         */
+        yaffs_handle_defered_free(obj);
+}
+
+/* yaffs_evict_inode combines into one operation what was previously done in
+ * yaffs_clear_inode() and yaffs_delete_inode()
+ *
+ */
+static void yaffs_evict_inode(struct inode *inode)
+{
+        struct yaffs_obj *obj;
+        struct yaffs_dev *dev;
+        int deleteme = 0;
+
+        obj = yaffs_inode_to_obj(inode);
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_evict_inode: ino %d, count %d %s",
+                (int)inode->i_ino,
+                atomic_read(&inode->i_count),
+                obj ? "object exists" : "null object");
+
+        if (!inode->i_nlink && !is_bad_inode(inode))
+                deleteme = 1;
+        truncate_inode_pages(&inode->i_data, 0);
+        end_writeback(inode);
+
+        if (deleteme && obj) {
+                dev = obj->my_dev;
+                yaffs_gross_lock(dev);
+                yaffs_del_obj(obj);
+                yaffs_gross_unlock(dev);
+        }
+        if (obj) {
+                dev = obj->my_dev;
+                yaffs_gross_lock(dev);
+                yaffs_unstitch_obj(inode, obj);
+                yaffs_gross_unlock(dev);
+        }
+
+}
+
+static void yaffs_touch_super(struct yaffs_dev *dev)
+{
+        struct super_block *sb = yaffs_dev_to_lc(dev)->super;
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
+        if (sb)
+                sb->s_dirt = 1;
+}
+
+static int yaffs_readpage_nolock(struct file *f, struct page *pg)
+{
+        /* Lifted from jffs2 */
+
+        struct yaffs_obj *obj;
+        unsigned char *pg_buf;
+        int ret;
+
+        struct yaffs_dev *dev;
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_readpage_nolock at %08x, size %08x",
+                (unsigned)(pg->index << PAGE_CACHE_SHIFT),
+                (unsigned)PAGE_CACHE_SIZE);
+
+        obj = yaffs_dentry_to_obj(f->f_dentry);
+
+        dev = obj->my_dev;
+
+        BUG_ON(!PageLocked(pg));
+
+        pg_buf = kmap(pg);
+        /* FIXME: Can kmap fail? */
+
+        yaffs_gross_lock(dev);
+
+        ret = yaffs_file_rd(obj, pg_buf,
+                            pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
+
+        yaffs_gross_unlock(dev);
+
+        if (ret >= 0)
+                ret = 0;
+
+        if (ret) {
+                ClearPageUptodate(pg);
+                SetPageError(pg);
+        } else {
+                SetPageUptodate(pg);
+                ClearPageError(pg);
+        }
+
+        flush_dcache_page(pg);
+        kunmap(pg);
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
+        return ret;
+}
+
+static int yaffs_readpage_unlock(struct file *f, struct page *pg)
+{
+        int ret = yaffs_readpage_nolock(f, pg);
+        UnlockPage(pg);
+        return ret;
+}
+
+static int yaffs_readpage(struct file *f, struct page *pg)
+{
+        int ret;
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
+        ret = yaffs_readpage_unlock(f, pg);
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
+        return ret;
+}
+
+/* writepage inspired by/stolen from smbfs */
+
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
+{
+        struct yaffs_dev *dev;
+        struct address_space *mapping = page->mapping;
+        struct inode *inode;
+        unsigned long end_index;
+        char *buffer;
+        struct yaffs_obj *obj;
+        int n_written = 0;
+        unsigned n_bytes;
+        loff_t i_size;
+
+        if (!mapping)
+                BUG();
+        inode = mapping->host;
+        if (!inode)
+                BUG();
+        i_size = i_size_read(inode);
+
+        end_index = i_size >> PAGE_CACHE_SHIFT;
+
+        if (page->index < end_index)
+                n_bytes = PAGE_CACHE_SIZE;
+        else {
+                n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
+
+                if (page->index > end_index || !n_bytes) {
+                        yaffs_trace(YAFFS_TRACE_OS,
+                                "yaffs_writepage at %08x, inode size = %08x!!!",
+                                (unsigned)(page->index << PAGE_CACHE_SHIFT),
+                                (unsigned)inode->i_size);
+                        yaffs_trace(YAFFS_TRACE_OS,
+                          "                -> don't care!!");
+
+                        zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+                        set_page_writeback(page);
+                        unlock_page(page);
+                        end_page_writeback(page);
+                        return 0;
+                }
+        }
+
+        if (n_bytes != PAGE_CACHE_SIZE)
+                zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
+
+        get_page(page);
+
+        buffer = kmap(page);
+
+        obj = yaffs_inode_to_obj(inode);
+        dev = obj->my_dev;
+        yaffs_gross_lock(dev);
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_writepage at %08x, size %08x",
+                (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
+        yaffs_trace(YAFFS_TRACE_OS,
+                "writepag0: obj = %05x, ino = %05x",
+                (int)obj->variant.file_variant.file_size, (int)inode->i_size);
+
+        n_written = yaffs_wr_file(obj, buffer,
+                                  page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
+
+        yaffs_touch_super(dev);
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "writepag1: obj = %05x, ino = %05x",
+                (int)obj->variant.file_variant.file_size, (int)inode->i_size);
+
+        yaffs_gross_unlock(dev);
+
+        kunmap(page);
+        set_page_writeback(page);
+        unlock_page(page);
+        end_page_writeback(page);
+        put_page(page);
+
+        return (n_written == n_bytes) ? 0 : -ENOSPC;
+}
+
+/* Space holding and freeing is done to ensure we have space available for 
+ * write_begin/end.
+ * For now we just assume few parallel writes and check against a small
+ * number.
+ * Todo: need to do this with a counter to handle parallel reads better.
+ */
+
+static ssize_t yaffs_hold_space(struct file *f)
+{
+        struct yaffs_obj *obj;
+        struct yaffs_dev *dev;
+
+        int n_free_chunks;
+
+        obj = yaffs_dentry_to_obj(f->f_dentry);
+
+        dev = obj->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        n_free_chunks = yaffs_get_n_free_chunks(dev);
+
+        yaffs_gross_unlock(dev);
+
+        return (n_free_chunks > 20) ? 1 : 0;
+}
+
+static void yaffs_release_space(struct file *f)
+{
+        struct yaffs_obj *obj;
+        struct yaffs_dev *dev;
+
+        obj = yaffs_dentry_to_obj(f->f_dentry);
+
+        dev = obj->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        yaffs_gross_unlock(dev);
+}
+
+static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
+                             loff_t pos, unsigned len, unsigned flags,
+                             struct page **pagep, void **fsdata)
+{
+        struct page *pg = NULL;
+        pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+
+        int ret = 0;
+        int space_held = 0;
+
+        /* Get a page */
+        pg = grab_cache_page_write_begin(mapping, index, flags);
+
+        *pagep = pg;
+        if (!pg) {
+                ret = -ENOMEM;
+                goto out;
+        }
+        yaffs_trace(YAFFS_TRACE_OS,
+                "start yaffs_write_begin index %d(%x) uptodate %d",
+                (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
+
+        /* Get fs space */
+        space_held = yaffs_hold_space(filp);
+
+        if (!space_held) {
+                ret = -ENOSPC;
+                goto out;
+        }
+
+        /* Update page if required */
+
+        if (!Page_Uptodate(pg))
+                ret = yaffs_readpage_nolock(filp, pg);
+
+        if (ret)
+                goto out;
+
+        /* Happy path return */
+        yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
+
+        return 0;
+
+out:
+        yaffs_trace(YAFFS_TRACE_OS,
+                "end yaffs_write_begin fail returning %d", ret);
+        if (space_held)
+                yaffs_release_space(filp);
+        if (pg) {
+                unlock_page(pg);
+                page_cache_release(pg);
+        }
+        return ret;
+}
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+                                loff_t * pos)
+{
+        struct yaffs_obj *obj;
+        int n_written, ipos;
+        struct inode *inode;
+        struct yaffs_dev *dev;
+
+        obj = yaffs_dentry_to_obj(f->f_dentry);
+
+        dev = obj->my_dev;
+
+        yaffs_gross_lock(dev);
+
+        inode = f->f_dentry->d_inode;
+
+        if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
+                ipos = inode->i_size;
+        else
+                ipos = *pos;
+
+        if (!obj)
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_file_write: hey obj is null!");
+        else
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
+                        (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
+
+        n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
+
+        yaffs_touch_super(dev);
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_file_write: %d(%x) bytes written",
+                (unsigned)n, (unsigned)n);
+
+        if (n_written > 0) {
+                ipos += n_written;
+                *pos = ipos;
+                if (ipos > inode->i_size) {
+                        inode->i_size = ipos;
+                        inode->i_blocks = (ipos + 511) >> 9;
+
+                        yaffs_trace(YAFFS_TRACE_OS,
+                                "yaffs_file_write size updated to %d bytes, %d blocks",
+                                ipos, (int)(inode->i_blocks));
+                }
+
+        }
+        yaffs_gross_unlock(dev);
+        return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
+}
+
+static int yaffs_write_end(struct file *filp, struct address_space *mapping,
+                           loff_t pos, unsigned len, unsigned copied,
+                           struct page *pg, void *fsdadata)
+{
+        int ret = 0;
+        void *addr, *kva;
+        uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
+
+        kva = kmap(pg);
+        addr = kva + offset_into_page;
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_write_end addr %p pos %x n_bytes %d",
+                addr, (unsigned)pos, copied);
+
+        ret = yaffs_file_write(filp, addr, copied, &pos);
+
+        if (ret != copied) {
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_write_end not same size ret %d  copied %d",
+                        ret, copied);
+                SetPageError(pg);
+        }
+
+        kunmap(pg);
+
+        yaffs_release_space(filp);
+        unlock_page(pg);
+        page_cache_release(pg);
+        return ret;
+}
+
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+        struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+        struct super_block *sb = dentry->d_sb;
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
+
+        yaffs_gross_lock(dev);
+
+        buf->f_type = YAFFS_MAGIC;
+        buf->f_bsize = sb->s_blocksize;
+        buf->f_namelen = 255;
+
+        if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
+                /* Do this if chunk size is not a power of 2 */
+
+                uint64_t bytes_in_dev;
+                uint64_t bytes_free;
+
+                bytes_in_dev =
+                    ((uint64_t)
+                     ((dev->param.end_block - dev->param.start_block +
+                       1))) * ((uint64_t) (dev->param.chunks_per_block *
+                                           dev->data_bytes_per_chunk));
+
+                do_div(bytes_in_dev, sb->s_blocksize);  /* bytes_in_dev becomes the number of blocks */
+                buf->f_blocks = bytes_in_dev;
+
+                bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
+                    ((uint64_t) (dev->data_bytes_per_chunk));
+
+                do_div(bytes_free, sb->s_blocksize);
+
+                buf->f_bfree = bytes_free;
+
+        } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
+
+                buf->f_blocks =
+                    (dev->param.end_block - dev->param.start_block + 1) *
+                    dev->param.chunks_per_block /
+                    (sb->s_blocksize / dev->data_bytes_per_chunk);
+                buf->f_bfree =
+                    yaffs_get_n_free_chunks(dev) /
+                    (sb->s_blocksize / dev->data_bytes_per_chunk);
+        } else {
+                buf->f_blocks =
+                    (dev->param.end_block - dev->param.start_block + 1) *
+                    dev->param.chunks_per_block *
+                    (dev->data_bytes_per_chunk / sb->s_blocksize);
+
+                buf->f_bfree =
+                    yaffs_get_n_free_chunks(dev) *
+                    (dev->data_bytes_per_chunk / sb->s_blocksize);
+        }
+
+        buf->f_files = 0;
+        buf->f_ffree = 0;
+        buf->f_bavail = buf->f_bfree;
+
+        yaffs_gross_unlock(dev);
+        return 0;
+}
+
+static void yaffs_flush_inodes(struct super_block *sb)
+{
+        struct inode *iptr;
+        struct yaffs_obj *obj;
+
+        list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
+                obj = yaffs_inode_to_obj(iptr);
+                if (obj) {
+                        yaffs_trace(YAFFS_TRACE_OS,
+                                "flushing obj %d", obj->obj_id);
+                        yaffs_flush_file(obj, 1, 0);
+                }
+        }
+}
+
+static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
+{
+        struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+        if (!dev)
+                return;
+
+        yaffs_flush_inodes(sb);
+        yaffs_update_dirty_dirs(dev);
+        yaffs_flush_whole_cache(dev);
+        if (do_checkpoint)
+                yaffs_checkpoint_save(dev);
+}
+
+static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
+{
+        unsigned erased_chunks =
+            dev->n_erased_blocks * dev->param.chunks_per_block;
+        struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+        unsigned scattered = 0; /* Free chunks not in an erased block */
+
+        if (erased_chunks < dev->n_free_chunks)
+                scattered = (dev->n_free_chunks - erased_chunks);
+
+        if (!context->bg_running)
+                return 0;
+        else if (scattered < (dev->param.chunks_per_block * 2))
+                return 0;
+        else if (erased_chunks > dev->n_free_chunks / 2)
+                return 0;
+        else if (erased_chunks > dev->n_free_chunks / 4)
+                return 1;
+        else
+                return 2;
+}
+
+static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
+{
+
+        struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+        unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+        unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
+        int do_checkpoint;
+
+        yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+                "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
+                gc_urgent,
+                sb->s_dirt ? "dirty" : "clean",
+                request_checkpoint ? "checkpoint requested" : "no checkpoint",
+                oneshot_checkpoint ? " one-shot" : "");
+
+        yaffs_gross_lock(dev);
+        do_checkpoint = ((request_checkpoint && !gc_urgent) ||
+                         oneshot_checkpoint) && !dev->is_checkpointed;
+
+        if (sb->s_dirt || do_checkpoint) {
+                yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
+                sb->s_dirt = 0;
+                if (oneshot_checkpoint)
+                        yaffs_auto_checkpoint &= ~4;
+        }
+        yaffs_gross_unlock(dev);
+
+        return 0;
+}
+
+/*
+ * yaffs background thread functions .
+ * yaffs_bg_thread_fn() the thread function
+ * yaffs_bg_start() launches the background thread.
+ * yaffs_bg_stop() cleans up the background thread.
+ *
+ * NB: 
+ * The thread should only run after the yaffs is initialised
+ * The thread should be stopped before yaffs is unmounted.
+ * The thread should not do any writing while the fs is in read only.
+ */
+
+void yaffs_background_waker(unsigned long data)
+{
+        wake_up_process((struct task_struct *)data);
+}
+
+static int yaffs_bg_thread_fn(void *data)
+{
+        struct yaffs_dev *dev = (struct yaffs_dev *)data;
+        struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+        unsigned long now = jiffies;
+        unsigned long next_dir_update = now;
+        unsigned long next_gc = now;
+        unsigned long expires;
+        unsigned int urgency;
+
+        int gc_result;
+        struct timer_list timer;
+
+        yaffs_trace(YAFFS_TRACE_BACKGROUND,
+                "yaffs_background starting for dev %p", (void *)dev);
+
+        set_freezable();
+        while (context->bg_running) {
+                yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
+
+                if (kthread_should_stop())
+                        break;
+
+                if (try_to_freeze())
+                        continue;
+
+                yaffs_gross_lock(dev);
+
+                now = jiffies;
+
+                if (time_after(now, next_dir_update) && yaffs_bg_enable) {
+                        yaffs_update_dirty_dirs(dev);
+                        next_dir_update = now + HZ;
+                }
+
+                if (time_after(now, next_gc) && yaffs_bg_enable) {
+                        if (!dev->is_checkpointed) {
+                                urgency = yaffs_bg_gc_urgency(dev);
+                                gc_result = yaffs_bg_gc(dev, urgency);
+                                if (urgency > 1)
+                                        next_gc = now + HZ / 20 + 1;
+                                else if (urgency > 0)
+                                        next_gc = now + HZ / 10 + 1;
+                                else
+                                        next_gc = now + HZ * 2;
+                        } else  {
+                                /*
+                                 * gc not running so set to next_dir_update
+                                 * to cut down on wake ups
+                                 */
+                                next_gc = next_dir_update;
+                        }
+                }
+                yaffs_gross_unlock(dev);
+                expires = next_dir_update;
+                if (time_before(next_gc, expires))
+                        expires = next_gc;
+                if (time_before(expires, now))
+                        expires = now + HZ;
+
+                Y_INIT_TIMER(&timer);
+                timer.expires = expires + 1;
+                timer.data = (unsigned long)current;
+                timer.function = yaffs_background_waker;
+
+                set_current_state(TASK_INTERRUPTIBLE);
+                add_timer(&timer);
+                schedule();
+                del_timer_sync(&timer);
+        }
+
+        return 0;
+}
+
+static int yaffs_bg_start(struct yaffs_dev *dev)
+{
+        int retval = 0;
+        struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+
+        if (dev->read_only)
+                return -1;
+
+        context->bg_running = 1;
+
+        context->bg_thread = kthread_run(yaffs_bg_thread_fn,
+                                         (void *)dev, "yaffs-bg-%d",
+                                         context->mount_id);
+
+        if (IS_ERR(context->bg_thread)) {
+                retval = PTR_ERR(context->bg_thread);
+                context->bg_thread = NULL;
+                context->bg_running = 0;
+        }
+        return retval;
+}
+
+static void yaffs_bg_stop(struct yaffs_dev *dev)
+{
+        struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
+
+        ctxt->bg_running = 0;
+
+        if (ctxt->bg_thread) {
+                kthread_stop(ctxt->bg_thread);
+                ctxt->bg_thread = NULL;
+        }
+}
+
+static void yaffs_write_super(struct super_block *sb)
+{
+        unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
+
+        yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+                "yaffs_write_super%s",
+                request_checkpoint ? " checkpt" : "");
+
+        yaffs_do_sync_fs(sb, request_checkpoint);
+
+}
+
+static int yaffs_sync_fs(struct super_block *sb, int wait)
+{
+        unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
+
+        yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+                "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
+
+        yaffs_do_sync_fs(sb, request_checkpoint);
+
+        return 0;
+}
+
+
+static LIST_HEAD(yaffs_context_list);
+struct mutex yaffs_context_lock;
+
+
+
+struct yaffs_options {
+        int inband_tags;
+        int skip_checkpoint_read;
+        int skip_checkpoint_write;
+        int no_cache;
+        int tags_ecc_on;
+        int tags_ecc_overridden;
+        int lazy_loading_enabled;
+        int lazy_loading_overridden;
+        int empty_lost_and_found;
+        int empty_lost_and_found_overridden;
+};
+
+#define MAX_OPT_LEN 30
+static int yaffs_parse_options(struct yaffs_options *options,
+                               const char *options_str)
+{
+        char cur_opt[MAX_OPT_LEN + 1];
+        int p;
+        int error = 0;
+
+        /* Parse through the options which is a comma seperated list */
+
+        while (options_str && *options_str && !error) {
+                memset(cur_opt, 0, MAX_OPT_LEN + 1);
+                p = 0;
+
+                while (*options_str == ',')
+                        options_str++;
+
+                while (*options_str && *options_str != ',') {
+                        if (p < MAX_OPT_LEN) {
+                                cur_opt[p] = *options_str;
+                                p++;
+                        }
+                        options_str++;
+                }
+
+                if (!strcmp(cur_opt, "inband-tags")) {
+                        options->inband_tags = 1;
+                } else if (!strcmp(cur_opt, "tags-ecc-off")) {
+                        options->tags_ecc_on = 0;
+                        options->tags_ecc_overridden = 1;
+                } else if (!strcmp(cur_opt, "tags-ecc-on")) {
+                        options->tags_ecc_on = 1;
+                        options->tags_ecc_overridden = 1;
+                } else if (!strcmp(cur_opt, "lazy-loading-off")) {
+                        options->lazy_loading_enabled = 0;
+                        options->lazy_loading_overridden = 1;
+                } else if (!strcmp(cur_opt, "lazy-loading-on")) {
+                        options->lazy_loading_enabled = 1;
+                        options->lazy_loading_overridden = 1;
+                } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
+                        options->empty_lost_and_found = 0;
+                        options->empty_lost_and_found_overridden = 1;
+                } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
+                        options->empty_lost_and_found = 1;
+                        options->empty_lost_and_found_overridden = 1;
+                } else if (!strcmp(cur_opt, "no-cache")) {
+                        options->no_cache = 1;
+                } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
+                        options->skip_checkpoint_read = 1;
+                } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
+                        options->skip_checkpoint_write = 1;
+                } else if (!strcmp(cur_opt, "no-checkpoint")) {
+                        options->skip_checkpoint_read = 1;
+                        options->skip_checkpoint_write = 1;
+                } else {
+                        printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
+                               cur_opt);
+                        error = 1;
+                }
+        }
+
+        return error;
+}
+
+static struct address_space_operations yaffs_file_address_operations = {
+        .readpage = yaffs_readpage,
+        .writepage = yaffs_writepage,
+        .write_begin = yaffs_write_begin,
+        .write_end = yaffs_write_end,
+};
+
+
+
+static const struct inode_operations yaffs_file_inode_operations = {
+        .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+        .setxattr = yaffs_setxattr,
+        .getxattr = yaffs_getxattr,
+        .listxattr = yaffs_listxattr,
+        .removexattr = yaffs_removexattr,
+#endif
+};
+
+static const struct inode_operations yaffs_symlink_inode_operations = {
+        .readlink = yaffs_readlink,
+        .follow_link = yaffs_follow_link,
+        .put_link = yaffs_put_link,
+        .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+        .setxattr = yaffs_setxattr,
+        .getxattr = yaffs_getxattr,
+        .listxattr = yaffs_listxattr,
+        .removexattr = yaffs_removexattr,
+#endif
+};
+
+static void yaffs_fill_inode_from_obj(struct inode *inode,
+                                      struct yaffs_obj *obj)
+{
+        if (inode && obj) {
+
+                /* Check mode against the variant type and attempt to repair if broken. */
+                u32 mode = obj->yst_mode;
+                switch (obj->variant_type) {
+                case YAFFS_OBJECT_TYPE_FILE:
+                        if (!S_ISREG(mode)) {
+                                obj->yst_mode &= ~S_IFMT;
+                                obj->yst_mode |= S_IFREG;
+                        }
+
+                        break;
+                case YAFFS_OBJECT_TYPE_SYMLINK:
+                        if (!S_ISLNK(mode)) {
+                                obj->yst_mode &= ~S_IFMT;
+                                obj->yst_mode |= S_IFLNK;
+                        }
+
+                        break;
+                case YAFFS_OBJECT_TYPE_DIRECTORY:
+                        if (!S_ISDIR(mode)) {
+                                obj->yst_mode &= ~S_IFMT;
+                                obj->yst_mode |= S_IFDIR;
+                        }
+
+                        break;
+                case YAFFS_OBJECT_TYPE_UNKNOWN:
+                case YAFFS_OBJECT_TYPE_HARDLINK:
+                case YAFFS_OBJECT_TYPE_SPECIAL:
+                default:
+                        /* TODO? */
+                        break;
+                }
+
+                inode->i_flags |= S_NOATIME;
+
+                inode->i_ino = obj->obj_id;
+                inode->i_mode = obj->yst_mode;
+                inode->i_uid = obj->yst_uid;
+                inode->i_gid = obj->yst_gid;
+
+                inode->i_rdev = old_decode_dev(obj->yst_rdev);
+
+                inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
+                inode->i_atime.tv_nsec = 0;
+                inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
+                inode->i_mtime.tv_nsec = 0;
+                inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
+                inode->i_ctime.tv_nsec = 0;
+                inode->i_size = yaffs_get_obj_length(obj);
+                inode->i_blocks = (inode->i_size + 511) >> 9;
+
+                inode->i_nlink = yaffs_get_obj_link_count(obj);
+
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
+                        inode->i_mode, inode->i_uid, inode->i_gid,
+                        (int)inode->i_size, atomic_read(&inode->i_count));
+
+                switch (obj->yst_mode & S_IFMT) {
+                default:        /* fifo, device or socket */
+                        init_special_inode(inode, obj->yst_mode,
+                                           old_decode_dev(obj->yst_rdev));
+                        break;
+                case S_IFREG:   /* file */
+                        inode->i_op = &yaffs_file_inode_operations;
+                        inode->i_fop = &yaffs_file_operations;
+                        inode->i_mapping->a_ops =
+                            &yaffs_file_address_operations;
+                        break;
+                case S_IFDIR:   /* directory */
+                        inode->i_op = &yaffs_dir_inode_operations;
+                        inode->i_fop = &yaffs_dir_operations;
+                        break;
+                case S_IFLNK:   /* symlink */
+                        inode->i_op = &yaffs_symlink_inode_operations;
+                        break;
+                }
+
+                yaffs_inode_to_obj_lv(inode) = obj;
+
+                obj->my_inode = inode;
+
+        } else {
+                yaffs_trace(YAFFS_TRACE_OS,
+                        "yaffs_fill_inode invalid parameters");
+        }
+}
+
+static void yaffs_put_super(struct super_block *sb)
+{
+        struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super");
+
+        yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+                "Shutting down yaffs background thread");
+        yaffs_bg_stop(dev);
+        yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+                "yaffs background thread shut down");
+
+        yaffs_gross_lock(dev);
+
+        yaffs_flush_super(sb, 1);
+
+        if (yaffs_dev_to_lc(dev)->put_super_fn)
+                yaffs_dev_to_lc(dev)->put_super_fn(sb);
+
+        yaffs_deinitialise(dev);
+
+        yaffs_gross_unlock(dev);
+        mutex_lock(&yaffs_context_lock);
+        list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
+        mutex_unlock(&yaffs_context_lock);
+
+        if (yaffs_dev_to_lc(dev)->spare_buffer) {
+                kfree(yaffs_dev_to_lc(dev)->spare_buffer);
+                yaffs_dev_to_lc(dev)->spare_buffer = NULL;
+        }
+
+        kfree(dev);
+}
+
+static void yaffs_mtd_put_super(struct super_block *sb)
+{
+        struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
+
+        if (mtd->sync)
+                mtd->sync(mtd);
+
+        put_mtd_device(mtd);
+}
+
+static const struct super_operations yaffs_super_ops = {
+        .statfs = yaffs_statfs,
+        .put_super = yaffs_put_super,
+        .evict_inode = yaffs_evict_inode,
+        .sync_fs = yaffs_sync_fs,
+        .write_super = yaffs_write_super,
+};
+
+static struct super_block *yaffs_internal_read_super(int yaffs_version,
+                                                     struct super_block *sb,
+                                                     void *data, int silent)
+{
+        int n_blocks;
+        struct inode *inode = NULL;
+        struct dentry *root;
+        struct yaffs_dev *dev = 0;
+        char devname_buf[BDEVNAME_SIZE + 1];
+        struct mtd_info *mtd;
+        int err;
+        char *data_str = (char *)data;
+        struct yaffs_linux_context *context = NULL;
+        struct yaffs_param *param;
+
+        int read_only = 0;
+
+        struct yaffs_options options;
+
+        unsigned mount_id;
+        int found;
+        struct yaffs_linux_context *context_iterator;
+        struct list_head *l;
+
+        sb->s_magic = YAFFS_MAGIC;
+        sb->s_op = &yaffs_super_ops;
+        sb->s_flags |= MS_NOATIME;
+
+        read_only = ((sb->s_flags & MS_RDONLY) != 0);
+
+        sb->s_export_op = &yaffs_export_ops;
+
+        if (!sb)
+                printk(KERN_INFO "yaffs: sb is NULL\n");
+        else if (!sb->s_dev)
+                printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
+        else if (!yaffs_devname(sb, devname_buf))
+                printk(KERN_INFO "yaffs: devname is NULL\n");
+        else
+                printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
+                       sb->s_dev,
+                       yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
+
+        if (!data_str)
+                data_str = "";
+
+        printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
+
+        memset(&options, 0, sizeof(options));
+
+        if (yaffs_parse_options(&options, data_str)) {
+                /* Option parsing failed */
+                return NULL;
+        }
+
+        sb->s_blocksize = PAGE_CACHE_SIZE;
+        sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_read_super: Using yaffs%d", yaffs_version);
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
+
+        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                "Attempting MTD mount of %u.%u,\"%s\"",
+                MAJOR(sb->s_dev), MINOR(sb->s_dev),
+                yaffs_devname(sb, devname_buf));
+
+        /* Check it's an mtd device..... */
+        if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
+                return NULL;    /* This isn't an mtd device */
+
+        /* Get the device */
+        mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
+        if (!mtd) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "MTD device #%u doesn't appear to exist",
+                        MINOR(sb->s_dev));
+                return NULL;
+        }
+        /* Check it's NAND */
+        if (mtd->type != MTD_NANDFLASH) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "MTD device is not NAND it's type %d",
+                        mtd->type);
+                return NULL;
+        }
+
+        yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase);
+        yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read);
+        yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write);
+        yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob);
+        yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob);
+        yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad);
+        yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad);
+        yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
+        yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
+        yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
+        yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
+
+#ifdef CONFIG_YAFFS_AUTO_YAFFS2
+
+        if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
+                yaffs_version = 2;
+        }
+
+        /* Added NCB 26/5/2006 for completeness */
+        if (yaffs_version == 2 && !options.inband_tags
+            && WRITE_SIZE(mtd) == 512) {
+                yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
+                yaffs_version = 1;
+        }
+#endif
+
+        if (yaffs_version == 2) {
+                /* Check for version 2 style functions */
+                if (!mtd->erase ||
+                    !mtd->block_isbad ||
+                    !mtd->block_markbad ||
+                    !mtd->read ||
+                    !mtd->write || !mtd->read_oob || !mtd->write_oob) {
+                        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                "MTD device does not support required functions");
+                        return NULL;
+                }
+
+                if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
+                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
+                    !options.inband_tags) {
+                        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                "MTD device does not have the right page sizes");
+                        return NULL;
+                }
+        } else {
+                /* Check for V1 style functions */
+                if (!mtd->erase ||
+                    !mtd->read ||
+                    !mtd->write || !mtd->read_oob || !mtd->write_oob) {
+                        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                "MTD device does not support required functions");
+                        return NULL;
+                }
+
+                if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
+                    mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
+                        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                "MTD device does not support have the right page sizes");
+                        return NULL;
+                }
+        }
+
+        /* OK, so if we got here, we have an MTD that's NAND and looks
+         * like it has the right capabilities
+         * Set the struct yaffs_dev up for mtd
+         */
+
+        if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
+                read_only = 1;
+                printk(KERN_INFO
+                       "yaffs: mtd is read only, setting superblock read only");
+                sb->s_flags |= MS_RDONLY;
+        }
+
+        dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
+        context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
+
+        if (!dev || !context) {
+                if (dev)
+                        kfree(dev);
+                if (context)
+                        kfree(context);
+                dev = NULL;
+                context = NULL;
+        }
+
+        if (!dev) {
+                /* Deep shit could not allocate device structure */
+                yaffs_trace(YAFFS_TRACE_ALWAYS,
+                        "yaffs_read_super failed trying to allocate yaffs_dev");
+                return NULL;
+        }
+        memset(dev, 0, sizeof(struct yaffs_dev));
+        param = &(dev->param);
+
+        memset(context, 0, sizeof(struct yaffs_linux_context));
+        dev->os_context = context;
+        INIT_LIST_HEAD(&(context->context_list));
+        context->dev = dev;
+        context->super = sb;
+
+        dev->read_only = read_only;
+
+        sb->s_fs_info = dev;
+
+        dev->driver_context = mtd;
+        param->name = mtd->name;
+
+        /* Set up the memory size parameters.... */
+
+        n_blocks =
+            YCALCBLOCKS(mtd->size,
+                        (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
+
+        param->start_block = 0;
+        param->end_block = n_blocks - 1;
+        param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
+        param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
+        param->n_reserved_blocks = 5;
+        param->n_caches = (options.no_cache) ? 0 : 10;
+        param->inband_tags = options.inband_tags;
+
+#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
+        param->disable_lazy_load = 1;
+#endif
+#ifdef CONFIG_YAFFS_XATTR
+        param->enable_xattr = 1;
+#endif
+        if (options.lazy_loading_overridden)
+                param->disable_lazy_load = !options.lazy_loading_enabled;
+
+#ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
+        param->no_tags_ecc = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
+#else
+        param->defered_dir_update = 1;
+#endif
+
+        if (options.tags_ecc_overridden)
+                param->no_tags_ecc = !options.tags_ecc_on;
+
+#ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
+        param->empty_lost_n_found = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
+        param->refresh_period = 0;
+#else
+        param->refresh_period = 500;
+#endif
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+        param->always_check_erased = 1;
+#endif
+
+        if (options.empty_lost_and_found_overridden)
+                param->empty_lost_n_found = options.empty_lost_and_found;
+
+        /* ... and the functions. */
+        if (yaffs_version == 2) {
+                param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
+                param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
+                param->bad_block_fn = nandmtd2_mark_block_bad;
+                param->query_block_fn = nandmtd2_query_block;
+                yaffs_dev_to_lc(dev)->spare_buffer = 
+                                kmalloc(mtd->oobsize, GFP_NOFS);
+                param->is_yaffs2 = 1;
+                param->total_bytes_per_chunk = mtd->writesize;
+                param->chunks_per_block = mtd->erasesize / mtd->writesize;
+                n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
+
+                param->start_block = 0;
+                param->end_block = n_blocks - 1;
+        } else {
+                /* use the MTD interface in yaffs_mtdif1.c */
+                param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
+                param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
+                param->bad_block_fn = nandmtd1_mark_block_bad;
+                param->query_block_fn = nandmtd1_query_block;
+                param->is_yaffs2 = 0;
+        }
+        /* ... and common functions */
+        param->erase_fn = nandmtd_erase_block;
+        param->initialise_flash_fn = nandmtd_initialise;
+
+        yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
+
+        param->sb_dirty_fn = yaffs_touch_super;
+        param->gc_control = yaffs_gc_control_callback;
+
+        yaffs_dev_to_lc(dev)->super = sb;
+
+#ifndef CONFIG_YAFFS_DOES_ECC
+        param->use_nand_ecc = 1;
+#endif
+
+        param->skip_checkpt_rd = options.skip_checkpoint_read;
+        param->skip_checkpt_wr = options.skip_checkpoint_write;
+
+        mutex_lock(&yaffs_context_lock);
+        /* Get a mount id */
+        found = 0;
+        for (mount_id = 0; !found; mount_id++) {
+                found = 1;
+                list_for_each(l, &yaffs_context_list) {
+                        context_iterator =
+                            list_entry(l, struct yaffs_linux_context,
+                                       context_list);
+                        if (context_iterator->mount_id == mount_id)
+                                found = 0;
+                }
+        }
+        context->mount_id = mount_id;
+
+        list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
+                      &yaffs_context_list);
+        mutex_unlock(&yaffs_context_lock);
+
+        /* Directory search handling... */
+        INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
+        param->remove_obj_fn = yaffs_remove_obj_callback;
+
+        mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
+
+        yaffs_gross_lock(dev);
+
+        err = yaffs_guts_initialise(dev);
+
+        yaffs_trace(YAFFS_TRACE_OS,
+                "yaffs_read_super: guts initialised %s",
+                (err == YAFFS_OK) ? "OK" : "FAILED");
+
+        if (err == YAFFS_OK)
+                yaffs_bg_start(dev);
+
+        if (!context->bg_thread)
+                param->defered_dir_update = 0;
+
+        /* Release lock before yaffs_get_inode() */
+        yaffs_gross_unlock(dev);
+
+        /* Create root inode */
+        if (err == YAFFS_OK)
+                inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
+
+        if (!inode)
+                return NULL;
+
+        inode->i_op = &yaffs_dir_inode_operations;
+        inode->i_fop = &yaffs_dir_operations;
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
+
+        root = d_alloc_root(inode);
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done");
+
+        if (!root) {
+                iput(inode);
+                return NULL;
+        }
+        sb->s_root = root;
+        sb->s_dirt = !dev->is_checkpointed;
+        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                "yaffs_read_super: is_checkpointed %d",
+                dev->is_checkpointed);
+
+        yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
+        return sb;
+}
+
+static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
+                                         int silent)
+{
+        return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
+}
+
+static struct dentry *yaffs_read_super(struct file_system_type *fs,
+                            int flags, const char *dev_name,
+                            void *data)
+{
+
+        return mount_bdev(fs, flags, dev_name, data,
+                           yaffs_internal_read_super_mtd);
+}
+
+static struct file_system_type yaffs_fs_type = {
+        .owner = THIS_MODULE,
+        .name = "yaffs",
+        .mount = yaffs_read_super,
+        .kill_sb = kill_block_super,
+        .fs_flags = FS_REQUIRES_DEV,
+};
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
+                                          int silent)
+{
+        return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
+}
+
+static struct dentry *yaffs2_read_super(struct file_system_type *fs,
+                             int flags, const char *dev_name, void *data)
+{
+        return mount_bdev(fs, flags, dev_name, data,
+                           yaffs2_internal_read_super_mtd);
+}
+
+static struct file_system_type yaffs2_fs_type = {
+        .owner = THIS_MODULE,
+        .name = "yaffs2",
+        .mount = yaffs2_read_super,
+        .kill_sb = kill_block_super,
+        .fs_flags = FS_REQUIRES_DEV,
+};
+#endif /* CONFIG_YAFFS_YAFFS2 */
+
+static struct proc_dir_entry *my_proc_entry;
+
+static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
+{
+        struct yaffs_param *param = &dev->param;
+        buf += sprintf(buf, "start_block........... %d\n", param->start_block);
+        buf += sprintf(buf, "end_block............. %d\n", param->end_block);
+        buf += sprintf(buf, "total_bytes_per_chunk. %d\n",
+                        param->total_bytes_per_chunk);
+        buf += sprintf(buf, "use_nand_ecc.......... %d\n",
+                        param->use_nand_ecc);
+        buf += sprintf(buf, "no_tags_ecc........... %d\n", param->no_tags_ecc);
+        buf += sprintf(buf, "is_yaffs2............. %d\n", param->is_yaffs2);
+        buf += sprintf(buf, "inband_tags........... %d\n", param->inband_tags);
+        buf += sprintf(buf, "empty_lost_n_found.... %d\n",
+                        param->empty_lost_n_found);
+        buf += sprintf(buf, "disable_lazy_load..... %d\n",
+                        param->disable_lazy_load);
+        buf += sprintf(buf, "refresh_period........ %d\n",
+                        param->refresh_period);
+        buf += sprintf(buf, "n_caches.............. %d\n", param->n_caches);
+        buf += sprintf(buf, "n_reserved_blocks..... %d\n",
+                        param->n_reserved_blocks);
+        buf += sprintf(buf, "always_check_erased... %d\n",
+                        param->always_check_erased);
+
+        return buf;
+}
+
+static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
+{
+        buf +=
+            sprintf(buf, "data_bytes_per_chunk.. %d\n",
+                    dev->data_bytes_per_chunk);
+        buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
+        buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
+        buf +=
+            sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
+        buf +=
+            sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
+        buf += sprintf(buf, "\n");
+        buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
+        buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
+        buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
+        buf += sprintf(buf, "\n");
+        buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
+        buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
+        buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
+        buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
+        buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
+        buf +=
+            sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
+        buf +=
+            sprintf(buf, "oldest_dirty_gc_count. %u\n",
+                    dev->oldest_dirty_gc_count);
+        buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
+        buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
+        buf +=
+            sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes);
+        buf +=
+            sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
+        buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
+        buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
+        buf +=
+            sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
+        buf +=
+            sprintf(buf, "n_tags_ecc_unfixed.... %u\n",
+                    dev->n_tags_ecc_unfixed);
+        buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
+        buf +=
+            sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
+        buf +=
+            sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
+        buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
+        buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
+
+        return buf;
+}
+
+static int yaffs_proc_read(char *page,
+                           char **start,
+                           off_t offset, int count, int *eof, void *data)
+{
+        struct list_head *item;
+        char *buf = page;
+        int step = offset;
+        int n = 0;
+
+        /* Get proc_file_read() to step 'offset' by one on each sucessive call.
+         * We use 'offset' (*ppos) to indicate where we are in dev_list.
+         * This also assumes the user has posted a read buffer large
+         * enough to hold the complete output; but that's life in /proc.
+         */
+
+        *(int *)start = 1;
+
+        /* Print header first */
+        if (step == 0)
+                buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n");
+        else if (step == 1)
+                buf += sprintf(buf, "\n");
+        else {
+                step -= 2;
+
+                mutex_lock(&yaffs_context_lock);
+
+                /* Locate and print the Nth entry.  Order N-squared but N is small. */
+                list_for_each(item, &yaffs_context_list) {
+                        struct yaffs_linux_context *dc =
+                            list_entry(item, struct yaffs_linux_context,
+                                       context_list);
+                        struct yaffs_dev *dev = dc->dev;
+
+                        if (n < (step & ~1)) {
+                                n += 2;
+                                continue;
+                        }
+                        if ((step & 1) == 0) {
+                                buf +=
+                                    sprintf(buf, "\nDevice %d \"%s\"\n", n,
+                                            dev->param.name);
+                                buf = yaffs_dump_dev_part0(buf, dev);
+                        } else {
+                                buf = yaffs_dump_dev_part1(buf, dev);
+                        }
+
+                        break;
+                }
+                mutex_unlock(&yaffs_context_lock);
+        }
+
+        return buf - page < count ? buf - page : count;
+}
+
+
+/**
+ * Set the verbosity of the warnings and error messages.
+ *
+ * Note that the names can only be a..z or _ with the current code.
+ */
+
+static struct {
+        char *mask_name;
+        unsigned mask_bitfield;
+} mask_flags[] = {
+        {"allocate", YAFFS_TRACE_ALLOCATE}, 
+        {"always", YAFFS_TRACE_ALWAYS},
+        {"background", YAFFS_TRACE_BACKGROUND},
+        {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
+        {"buffers", YAFFS_TRACE_BUFFERS},
+        {"bug", YAFFS_TRACE_BUG},
+        {"checkpt", YAFFS_TRACE_CHECKPOINT},
+        {"deletion", YAFFS_TRACE_DELETION},
+        {"erase", YAFFS_TRACE_ERASE},
+        {"error", YAFFS_TRACE_ERROR},
+        {"gc_detail", YAFFS_TRACE_GC_DETAIL},
+        {"gc", YAFFS_TRACE_GC},
+        {"lock", YAFFS_TRACE_LOCK},
+        {"mtd", YAFFS_TRACE_MTD},
+        {"nandaccess", YAFFS_TRACE_NANDACCESS},
+        {"os", YAFFS_TRACE_OS},
+        {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
+        {"scan", YAFFS_TRACE_SCAN},
+        {"mount", YAFFS_TRACE_MOUNT},
+        {"tracing", YAFFS_TRACE_TRACING},
+        {"sync", YAFFS_TRACE_SYNC},
+        {"write", YAFFS_TRACE_WRITE},
+        {"verify", YAFFS_TRACE_VERIFY},
+        {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
+        {"verify_full", YAFFS_TRACE_VERIFY_FULL},
+        {"verify_all", YAFFS_TRACE_VERIFY_ALL},
+        {"all", 0xffffffff},
+        {"none", 0},
+        {NULL, 0},
+};
+
+#define MAX_MASK_NAME_LENGTH 40
+static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
+                                          unsigned long count, void *data)
+{
+        unsigned rg = 0, mask_bitfield;
+        char *end;
+        char *mask_name;
+        const char *x;
+        char substring[MAX_MASK_NAME_LENGTH + 1];
+        int i;
+        int done = 0;
+        int add, len = 0;
+        int pos = 0;
+
+        rg = yaffs_trace_mask;
+
+        while (!done && (pos < count)) {
+                done = 1;
+                while ((pos < count) && isspace(buf[pos]))
+                        pos++;
+
+                switch (buf[pos]) {
+                case '+':
+                case '-':
+                case '=':
+                        add = buf[pos];
+                        pos++;
+                        break;
+
+                default:
+                        add = ' ';
+                        break;
+                }
+                mask_name = NULL;
+
+                mask_bitfield = simple_strtoul(buf + pos, &end, 0);
+
+                if (end > buf + pos) {
+                        mask_name = "numeral";
+                        len = end - (buf + pos);
+                        pos += len;
+                        done = 0;
+                } else {
+                        for (x = buf + pos, i = 0;
+                             (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
+                             i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
+                                substring[i] = *x;
+                        substring[i] = '\0';
+
+                        for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+                                if (strcmp(substring, mask_flags[i].mask_name)
+                                    == 0) {
+                                        mask_name = mask_flags[i].mask_name;
+                                        mask_bitfield =
+                                            mask_flags[i].mask_bitfield;
+                                        done = 0;
+                                        break;
+                                }
+                        }
+                }
+
+                if (mask_name != NULL) {
+                        done = 0;
+                        switch (add) {
+                        case '-':
+                                rg &= ~mask_bitfield;
+                                break;
+                        case '+':
+                                rg |= mask_bitfield;
+                                break;
+                        case '=':
+                                rg = mask_bitfield;
+                                break;
+                        default:
+                                rg |= mask_bitfield;
+                                break;
+                        }
+                }
+        }
+
+        yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
+
+        printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
+
+        if (rg & YAFFS_TRACE_ALWAYS) {
+                for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+                        char flag;
+                        flag = ((rg & mask_flags[i].mask_bitfield) ==
+                                mask_flags[i].mask_bitfield) ? '+' : '-';
+                        printk(KERN_DEBUG "%c%s\n", flag,
+                               mask_flags[i].mask_name);
+                }
+        }
+
+        return count;
+}
+
+static int yaffs_proc_write(struct file *file, const char *buf,
+                            unsigned long count, void *data)
+{
+        return yaffs_proc_write_trace_options(file, buf, count, data);
+}
+
+/* Stuff to handle installation of file systems */
+struct file_system_to_install {
+        struct file_system_type *fst;
+        int installed;
+};
+
+static struct file_system_to_install fs_to_install[] = {
+        {&yaffs_fs_type, 0},
+        {&yaffs2_fs_type, 0},
+        {NULL, 0}
+};
+
+static int __init init_yaffs_fs(void)
+{
+        int error = 0;
+        struct file_system_to_install *fsinst;
+
+        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                "yaffs built " __DATE__ " " __TIME__ " Installing.");
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                "\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n");
+#endif
+
+        mutex_init(&yaffs_context_lock);
+
+        /* Install the proc_fs entries */
+        my_proc_entry = create_proc_entry("yaffs",
+                                          S_IRUGO | S_IFREG, YPROC_ROOT);
+
+        if (my_proc_entry) {
+                my_proc_entry->write_proc = yaffs_proc_write;
+                my_proc_entry->read_proc = yaffs_proc_read;
+                my_proc_entry->data = NULL;
+        } else {
+                return -ENOMEM;
+        }
+
+
+        /* Now add the file system entries */
+
+        fsinst = fs_to_install;
+
+        while (fsinst->fst && !error) {
+                error = register_filesystem(fsinst->fst);
+                if (!error)
+                        fsinst->installed = 1;
+                fsinst++;
+        }
+
+        /* Any errors? uninstall  */
+        if (error) {
+                fsinst = fs_to_install;
+
+                while (fsinst->fst) {
+                        if (fsinst->installed) {
+                                unregister_filesystem(fsinst->fst);
+                                fsinst->installed = 0;
+                        }
+                        fsinst++;
+                }
+        }
+
+        return error;
+}
+
+static void __exit exit_yaffs_fs(void)
+{
+
+        struct file_system_to_install *fsinst;
+
+        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                "yaffs built " __DATE__ " " __TIME__ " removing.");
+
+        remove_proc_entry("yaffs", YPROC_ROOT);
+
+        fsinst = fs_to_install;
+
+        while (fsinst->fst) {
+                if (fsinst->installed) {
+                        unregister_filesystem(fsinst->fst);
+                        fsinst->installed = 0;
+                }
+                fsinst++;
+        }
+}
+
+module_init(init_yaffs_fs)
+    module_exit(exit_yaffs_fs)
+
+    MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
+MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
+MODULE_LICENSE("GPL");
diff --git a/fs/yaffs2/yaffs_yaffs1.c b/fs/yaffs2/yaffs_yaffs1.c
new file mode 100644
index 00000000000..9eb60308254
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.c
@@ -0,0 +1,433 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_yaffs1.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+#include "yaffs_attribs.h"
+
+int yaffs1_scan(struct yaffs_dev *dev)
+{
+        struct yaffs_ext_tags tags;
+        int blk;
+        int result;
+
+        int chunk;
+        int c;
+        int deleted;
+        enum yaffs_block_state state;
+        struct yaffs_obj *hard_list = NULL;
+        struct yaffs_block_info *bi;
+        u32 seq_number;
+        struct yaffs_obj_hdr *oh;
+        struct yaffs_obj *in;
+        struct yaffs_obj *parent;
+
+        int alloc_failed = 0;
+
+        struct yaffs_shadow_fixer *shadow_fixers = NULL;
+
+        u8 *chunk_data;
+
+        yaffs_trace(YAFFS_TRACE_SCAN,
+                "yaffs1_scan starts  intstartblk %d intendblk %d...",
+                dev->internal_start_block, dev->internal_end_block);
+
+        chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
+
+        dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+        /* Scan all the blocks to determine their state */
+        bi = dev->block_info;
+        for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+             blk++) {
+                yaffs_clear_chunk_bits(dev, blk);
+                bi->pages_in_use = 0;
+                bi->soft_del_pages = 0;
+
+                yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+                bi->block_state = state;
+                bi->seq_number = seq_number;
+
+                if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+                        bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
+
+                yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
+                        "Block scanning block %d state %d seq %d",
+                        blk, state, seq_number);
+
+                if (state == YAFFS_BLOCK_STATE_DEAD) {
+                        yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+                                "block %d is bad", blk);
+                } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+                        yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
+                        dev->n_erased_blocks++;
+                        dev->n_free_chunks += dev->param.chunks_per_block;
+                }
+                bi++;
+        }
+
+        /* For each block.... */
+        for (blk = dev->internal_start_block;
+             !alloc_failed && blk <= dev->internal_end_block; blk++) {
+
+                cond_resched();
+
+                bi = yaffs_get_block_info(dev, blk);
+                state = bi->block_state;
+
+                deleted = 0;
+
+                /* For each chunk in each block that needs scanning.... */
+                for (c = 0; !alloc_failed && c < dev->param.chunks_per_block &&
+                     state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
+                        /* Read the tags and decide what to do */
+                        chunk = blk * dev->param.chunks_per_block + c;
+
+                        result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
+                                                          &tags);
+
+                        /* Let's have a good look at this chunk... */
+
+                        if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED
+                            || tags.is_deleted) {
+                                /* YAFFS1 only...
+                                 * A deleted chunk
+                                 */
+                                deleted++;
+                                dev->n_free_chunks++;
+                                /*T((" %d %d deleted\n",blk,c)); */
+                        } else if (!tags.chunk_used) {
+                                /* An unassigned chunk in the block
+                                 * This means that either the block is empty or
+                                 * this is the one being allocated from
+                                 */
+
+                                if (c == 0) {
+                                        /* We're looking at the first chunk in the block so the block is unused */
+                                        state = YAFFS_BLOCK_STATE_EMPTY;
+                                        dev->n_erased_blocks++;
+                                } else {
+                                        /* this is the block being allocated from */
+                                        yaffs_trace(YAFFS_TRACE_SCAN,
+                                                " Allocating from %d %d",
+                                                blk, c);
+                                        state = YAFFS_BLOCK_STATE_ALLOCATING;
+                                        dev->alloc_block = blk;
+                                        dev->alloc_page = c;
+                                        dev->alloc_block_finder = blk;
+                                        /* Set block finder here to encourage the allocator to go forth from here. */
+
+                                }
+
+                                dev->n_free_chunks +=
+                                    (dev->param.chunks_per_block - c);
+                        } else if (tags.chunk_id > 0) {
+                                /* chunk_id > 0 so it is a data chunk... */
+                                unsigned int endpos;
+
+                                yaffs_set_chunk_bit(dev, blk, c);
+                                bi->pages_in_use++;
+
+                                in = yaffs_find_or_create_by_number(dev,
+                                                                    tags.obj_id,
+                                                                    YAFFS_OBJECT_TYPE_FILE);
+                                /* PutChunkIntoFile checks for a clash (two data chunks with
+                                 * the same chunk_id).
+                                 */
+
+                                if (!in)
+                                        alloc_failed = 1;
+
+                                if (in) {
+                                        if (!yaffs_put_chunk_in_file
+                                            (in, tags.chunk_id, chunk, 1))
+                                                alloc_failed = 1;
+                                }
+
+                                endpos =
+                                    (tags.chunk_id -
+                                     1) * dev->data_bytes_per_chunk +
+                                    tags.n_bytes;
+                                if (in
+                                    && in->variant_type ==
+                                    YAFFS_OBJECT_TYPE_FILE
+                                    && in->variant.file_variant.scanned_size <
+                                    endpos) {
+                                        in->variant.file_variant.scanned_size =
+                                            endpos;
+                                        if (!dev->param.use_header_file_size) {
+                                                in->variant.
+                                                    file_variant.file_size =
+                                                    in->variant.
+                                                    file_variant.scanned_size;
+                                        }
+
+                                }
+                                /* T((" %d %d data %d %d\n",blk,c,tags.obj_id,tags.chunk_id));   */
+                        } else {
+                                /* chunk_id == 0, so it is an ObjectHeader.
+                                 * Thus, we read in the object header and make the object
+                                 */
+                                yaffs_set_chunk_bit(dev, blk, c);
+                                bi->pages_in_use++;
+
+                                result = yaffs_rd_chunk_tags_nand(dev, chunk,
+                                                                  chunk_data,
+                                                                  NULL);
+
+                                oh = (struct yaffs_obj_hdr *)chunk_data;
+
+                                in = yaffs_find_by_number(dev, tags.obj_id);
+                                if (in && in->variant_type != oh->type) {
+                                        /* This should not happen, but somehow
+                                         * Wev'e ended up with an obj_id that has been reused but not yet
+                                         * deleted, and worse still it has changed type. Delete the old object.
+                                         */
+
+                                        yaffs_del_obj(in);
+
+                                        in = 0;
+                                }
+
+                                in = yaffs_find_or_create_by_number(dev,
+                                                                    tags.obj_id,
+                                                                    oh->type);
+
+                                if (!in)
+                                        alloc_failed = 1;
+
+                                if (in && oh->shadows_obj > 0) {
+
+                                        struct yaffs_shadow_fixer *fixer;
+                                        fixer =
+                                                kmalloc(sizeof
+                                                (struct yaffs_shadow_fixer),
+                                                GFP_NOFS);
+                                        if (fixer) {
+                                                fixer->next = shadow_fixers;
+                                                shadow_fixers = fixer;
+                                                fixer->obj_id = tags.obj_id;
+                                                fixer->shadowed_id =
+                                                    oh->shadows_obj;
+                                                yaffs_trace(YAFFS_TRACE_SCAN,
+                                                        " Shadow fixer: %d shadows %d",
+                                                        fixer->obj_id,
+                                                        fixer->shadowed_id);
+
+                                        }
+
+                                }
+
+                                if (in && in->valid) {
+                                        /* We have already filled this one. We have a duplicate and need to resolve it. */
+
+                                        unsigned existing_serial = in->serial;
+                                        unsigned new_serial =
+                                            tags.serial_number;
+
+                                        if (((existing_serial + 1) & 3) ==
+                                            new_serial) {
+                                                /* Use new one - destroy the exisiting one */
+                                                yaffs_chunk_del(dev,
+                                                                in->hdr_chunk,
+                                                                1, __LINE__);
+                                                in->valid = 0;
+                                        } else {
+                                                /* Use existing - destroy this one. */
+                                                yaffs_chunk_del(dev, chunk, 1,
+                                                                __LINE__);
+                                        }
+                                }
+
+                                if (in && !in->valid &&
+                                    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+                                     tags.obj_id ==
+                                     YAFFS_OBJECTID_LOSTNFOUND)) {
+                                        /* We only load some info, don't fiddle with directory structure */
+                                        in->valid = 1;
+                                        in->variant_type = oh->type;
+
+                                        in->yst_mode = oh->yst_mode;
+                                        yaffs_load_attribs(in, oh);
+                                        in->hdr_chunk = chunk;
+                                        in->serial = tags.serial_number;
+
+                                } else if (in && !in->valid) {
+                                        /* we need to load this info */
+
+                                        in->valid = 1;
+                                        in->variant_type = oh->type;
+
+                                        in->yst_mode = oh->yst_mode;
+                                        yaffs_load_attribs(in, oh);
+                                        in->hdr_chunk = chunk;
+                                        in->serial = tags.serial_number;
+
+                                        yaffs_set_obj_name_from_oh(in, oh);
+                                        in->dirty = 0;
+
+                                        /* directory stuff...
+                                         * hook up to parent
+                                         */
+
+                                        parent =
+                                            yaffs_find_or_create_by_number
+                                            (dev, oh->parent_obj_id,
+                                             YAFFS_OBJECT_TYPE_DIRECTORY);
+                                        if (!parent)
+                                                alloc_failed = 1;
+                                        if (parent && parent->variant_type ==
+                                            YAFFS_OBJECT_TYPE_UNKNOWN) {
+                                                /* Set up as a directory */
+                                                parent->variant_type =
+                                                    YAFFS_OBJECT_TYPE_DIRECTORY;
+                                                INIT_LIST_HEAD(&parent->
+                                                               variant.dir_variant.children);
+                                        } else if (!parent
+                                                   || parent->variant_type !=
+                                                   YAFFS_OBJECT_TYPE_DIRECTORY) {
+                                                /* Hoosterman, another problem....
+                                                 * We're trying to use a non-directory as a directory
+                                                 */
+
+                                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                                        "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+                                                        );
+                                                parent = dev->lost_n_found;
+                                        }
+
+                                        yaffs_add_obj_to_dir(parent, in);
+
+                                        if (0 && (parent == dev->del_dir ||
+                                                  parent ==
+                                                  dev->unlinked_dir)) {
+                                                in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
+                                                dev->n_deleted_files++;
+                                        }
+                                        /* Note re hardlinks.
+                                         * Since we might scan a hardlink before its equivalent object is scanned
+                                         * we put them all in a list.
+                                         * After scanning is complete, we should have all the objects, so we run through this
+                                         * list and fix up all the chains.
+                                         */
+
+                                        switch (in->variant_type) {
+                                        case YAFFS_OBJECT_TYPE_UNKNOWN:
+                                                /* Todo got a problem */
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_FILE:
+                                                if (dev->param.
+                                                    use_header_file_size)
+
+                                                        in->variant.
+                                                            file_variant.file_size
+                                                            = oh->file_size;
+
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_HARDLINK:
+                                                in->variant.
+                                                    hardlink_variant.equiv_id =
+                                                    oh->equiv_id;
+                                                in->hard_links.next =
+                                                    (struct list_head *)
+                                                    hard_list;
+                                                hard_list = in;
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_DIRECTORY:
+                                                /* Do nothing */
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_SPECIAL:
+                                                /* Do nothing */
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_SYMLINK:
+                                                in->variant.symlink_variant.
+                                                    alias =
+                                                    yaffs_clone_str(oh->alias);
+                                                if (!in->variant.
+                                                    symlink_variant.alias)
+                                                        alloc_failed = 1;
+                                                break;
+                                        }
+
+                                }
+                        }
+                }
+
+                if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+                        /* If we got this far while scanning, then the block is fully allocated. */
+                        state = YAFFS_BLOCK_STATE_FULL;
+                }
+
+                if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
+                        /* If the block was partially allocated then treat it as fully allocated. */
+                        state = YAFFS_BLOCK_STATE_FULL;
+                        dev->alloc_block = -1;
+                }
+
+                bi->block_state = state;
+
+                /* Now let's see if it was dirty */
+                if (bi->pages_in_use == 0 &&
+                    !bi->has_shrink_hdr &&
+                    bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+                        yaffs_block_became_dirty(dev, blk);
+                }
+
+        }
+
+        /* Ok, we've done all the scanning.
+         * Fix up the hard link chains.
+         * We should now have scanned all the objects, now it's time to add these
+         * hardlinks.
+         */
+
+        yaffs_link_fixup(dev, hard_list);
+
+        /* Fix up any shadowed objects */
+        {
+                struct yaffs_shadow_fixer *fixer;
+                struct yaffs_obj *obj;
+
+                while (shadow_fixers) {
+                        fixer = shadow_fixers;
+                        shadow_fixers = fixer->next;
+                        /* Complete the rename transaction by deleting the shadowed object
+                         * then setting the object header to unshadowed.
+                         */
+                        obj = yaffs_find_by_number(dev, fixer->shadowed_id);
+                        if (obj)
+                                yaffs_del_obj(obj);
+
+                        obj = yaffs_find_by_number(dev, fixer->obj_id);
+
+                        if (obj)
+                                yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+                        kfree(fixer);
+                }
+        }
+
+        yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
+
+        if (alloc_failed)
+                return YAFFS_FAIL;
+
+        yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends");
+
+        return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_yaffs1.h b/fs/yaffs2/yaffs_yaffs1.h
new file mode 100644
index 00000000000..db23e04973b
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.h
@@ -0,0 +1,22 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS1_H__
+#define __YAFFS_YAFFS1_H__
+
+#include "yaffs_guts.h"
+int yaffs1_scan(struct yaffs_dev *dev);
+
+#endif
diff --git a/fs/yaffs2/yaffs_yaffs2.c b/fs/yaffs2/yaffs_yaffs2.c
new file mode 100644
index 00000000000..33397af7003
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.c
@@ -0,0 +1,1598 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_checkptrw.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_verify.h"
+#include "yaffs_attribs.h"
+
+/*
+ * Checkpoints are really no benefit on very small partitions.
+ *
+ * To save space on small partitions don't bother with checkpoints unless
+ * the partition is at least this big.
+ */
+#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
+
+#define YAFFS_SMALL_HOLE_THRESHOLD 4
+
+/*
+ * Oldest Dirty Sequence Number handling.
+ */
+
+/* yaffs_calc_oldest_dirty_seq()
+ * yaffs2_find_oldest_dirty_seq()
+ * Calculate the oldest dirty sequence number if we don't know it.
+ */
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+        int i;
+        unsigned seq;
+        unsigned block_no = 0;
+        struct yaffs_block_info *b;
+
+        if (!dev->param.is_yaffs2)
+                return;
+
+        /* Find the oldest dirty sequence number. */
+        seq = dev->seq_number + 1;
+        b = dev->block_info;
+        for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+                if (b->block_state == YAFFS_BLOCK_STATE_FULL &&
+                    (b->pages_in_use - b->soft_del_pages) <
+                    dev->param.chunks_per_block && b->seq_number < seq) {
+                        seq = b->seq_number;
+                        block_no = i;
+                }
+                b++;
+        }
+
+        if (block_no) {
+                dev->oldest_dirty_seq = seq;
+                dev->oldest_dirty_block = block_no;
+        }
+
+}
+
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+        if (!dev->param.is_yaffs2)
+                return;
+
+        if (!dev->oldest_dirty_seq)
+                yaffs_calc_oldest_dirty_seq(dev);
+}
+
+/*
+ * yaffs_clear_oldest_dirty_seq()
+ * Called when a block is erased or marked bad. (ie. when its seq_number
+ * becomes invalid). If the value matches the oldest then we clear 
+ * dev->oldest_dirty_seq to force its recomputation.
+ */
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+                                   struct yaffs_block_info *bi)
+{
+
+        if (!dev->param.is_yaffs2)
+                return;
+
+        if (!bi || bi->seq_number == dev->oldest_dirty_seq) {
+                dev->oldest_dirty_seq = 0;
+                dev->oldest_dirty_block = 0;
+        }
+}
+
+/*
+ * yaffs2_update_oldest_dirty_seq()
+ * Update the oldest dirty sequence number whenever we dirty a block.
+ * Only do this if the oldest_dirty_seq is actually being tracked.
+ */
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+                                    struct yaffs_block_info *bi)
+{
+        if (!dev->param.is_yaffs2)
+                return;
+
+        if (dev->oldest_dirty_seq) {
+                if (dev->oldest_dirty_seq > bi->seq_number) {
+                        dev->oldest_dirty_seq = bi->seq_number;
+                        dev->oldest_dirty_block = block_no;
+                }
+        }
+}
+
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi)
+{
+
+        if (!dev->param.is_yaffs2)
+                return 1;       /* disqualification only applies to yaffs2. */
+
+        if (!bi->has_shrink_hdr)
+                return 1;       /* can gc */
+
+        yaffs2_find_oldest_dirty_seq(dev);
+
+        /* Can't do gc of this block if there are any blocks older than this one that have
+         * discarded pages.
+         */
+        return (bi->seq_number <= dev->oldest_dirty_seq);
+}
+
+/*
+ * yaffs2_find_refresh_block()
+ * periodically finds the oldest full block by sequence number for refreshing.
+ * Only for yaffs2.
+ */
+u32 yaffs2_find_refresh_block(struct yaffs_dev * dev)
+{
+        u32 b;
+
+        u32 oldest = 0;
+        u32 oldest_seq = 0;
+
+        struct yaffs_block_info *bi;
+
+        if (!dev->param.is_yaffs2)
+                return oldest;
+
+        /*
+         * If refresh period < 10 then refreshing is disabled.
+         */
+        if (dev->param.refresh_period < 10)
+                return oldest;
+
+        /*
+         * Fix broken values.
+         */
+        if (dev->refresh_skip > dev->param.refresh_period)
+                dev->refresh_skip = dev->param.refresh_period;
+
+        if (dev->refresh_skip > 0)
+                return oldest;
+
+        /*
+         * Refresh skip is now zero.
+         * We'll do a refresh this time around....
+         * Update the refresh skip and find the oldest block.
+         */
+        dev->refresh_skip = dev->param.refresh_period;
+        dev->refresh_count++;
+        bi = dev->block_info;
+        for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+
+                if (bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+
+                        if (oldest < 1 || bi->seq_number < oldest_seq) {
+                                oldest = b;
+                                oldest_seq = bi->seq_number;
+                        }
+                }
+                bi++;
+        }
+
+        if (oldest > 0) {
+                yaffs_trace(YAFFS_TRACE_GC,
+                        "GC refresh count %d selected block %d with seq_number %d",
+                        dev->refresh_count, oldest, oldest_seq);
+        }
+
+        return oldest;
+}
+
+int yaffs2_checkpt_required(struct yaffs_dev *dev)
+{
+        int nblocks;
+
+        if (!dev->param.is_yaffs2)
+                return 0;
+
+        nblocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+        return !dev->param.skip_checkpt_wr &&
+            !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
+}
+
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev)
+{
+        int retval;
+
+        if (!dev->param.is_yaffs2)
+                return 0;
+
+        if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) {
+                /* Not a valid value so recalculate */
+                int n_bytes = 0;
+                int n_blocks;
+                int dev_blocks =
+                    (dev->param.end_block - dev->param.start_block + 1);
+
+                n_bytes += sizeof(struct yaffs_checkpt_validity);
+                n_bytes += sizeof(struct yaffs_checkpt_dev);
+                n_bytes += dev_blocks * sizeof(struct yaffs_block_info);
+                n_bytes += dev_blocks * dev->chunk_bit_stride;
+                n_bytes +=
+                    (sizeof(struct yaffs_checkpt_obj) +
+                     sizeof(u32)) * (dev->n_obj);
+                n_bytes += (dev->tnode_size + sizeof(u32)) * (dev->n_tnodes);
+                n_bytes += sizeof(struct yaffs_checkpt_validity);
+                n_bytes += sizeof(u32); /* checksum */
+
+                /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
+
+                n_blocks =
+                    (n_bytes /
+                     (dev->data_bytes_per_chunk *
+                      dev->param.chunks_per_block)) + 3;
+
+                dev->checkpoint_blocks_required = n_blocks;
+        }
+
+        retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt;
+        if (retval < 0)
+                retval = 0;
+        return retval;
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+        struct yaffs_checkpt_validity cp;
+
+        memset(&cp, 0, sizeof(cp));
+
+        cp.struct_type = sizeof(cp);
+        cp.magic = YAFFS_MAGIC;
+        cp.version = YAFFS_CHECKPOINT_VERSION;
+        cp.head = (head) ? 1 : 0;
+
+        return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+        struct yaffs_checkpt_validity cp;
+        int ok;
+
+        ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+        if (ok)
+                ok = (cp.struct_type == sizeof(cp)) &&
+                    (cp.magic == YAFFS_MAGIC) &&
+                    (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+                    (cp.head == ((head) ? 1 : 0));
+        return ok ? 1 : 0;
+}
+
+static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp,
+                                      struct yaffs_dev *dev)
+{
+        cp->n_erased_blocks = dev->n_erased_blocks;
+        cp->alloc_block = dev->alloc_block;
+        cp->alloc_page = dev->alloc_page;
+        cp->n_free_chunks = dev->n_free_chunks;
+
+        cp->n_deleted_files = dev->n_deleted_files;
+        cp->n_unlinked_files = dev->n_unlinked_files;
+        cp->n_bg_deletions = dev->n_bg_deletions;
+        cp->seq_number = dev->seq_number;
+
+}
+
+static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev,
+                                     struct yaffs_checkpt_dev *cp)
+{
+        dev->n_erased_blocks = cp->n_erased_blocks;
+        dev->alloc_block = cp->alloc_block;
+        dev->alloc_page = cp->alloc_page;
+        dev->n_free_chunks = cp->n_free_chunks;
+
+        dev->n_deleted_files = cp->n_deleted_files;
+        dev->n_unlinked_files = cp->n_unlinked_files;
+        dev->n_bg_deletions = cp->n_bg_deletions;
+        dev->seq_number = cp->seq_number;
+}
+
+static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev)
+{
+        struct yaffs_checkpt_dev cp;
+        u32 n_bytes;
+        u32 n_blocks =
+            (dev->internal_end_block - dev->internal_start_block + 1);
+
+        int ok;
+
+        /* Write device runtime values */
+        yaffs2_dev_to_checkpt_dev(&cp, dev);
+        cp.struct_type = sizeof(cp);
+
+        ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+        /* Write block info */
+        if (ok) {
+                n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+                ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) ==
+                      n_bytes);
+        }
+
+        /* Write chunk bits */
+        if (ok) {
+                n_bytes = n_blocks * dev->chunk_bit_stride;
+                ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) ==
+                      n_bytes);
+        }
+        return ok ? 1 : 0;
+
+}
+
+static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
+{
+        struct yaffs_checkpt_dev cp;
+        u32 n_bytes;
+        u32 n_blocks =
+            (dev->internal_end_block - dev->internal_start_block + 1);
+
+        int ok;
+
+        ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+        if (!ok)
+                return 0;
+
+        if (cp.struct_type != sizeof(cp))
+                return 0;
+
+        yaffs_checkpt_dev_to_dev(dev, &cp);
+
+        n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+
+        ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) == n_bytes);
+
+        if (!ok)
+                return 0;
+        n_bytes = n_blocks * dev->chunk_bit_stride;
+
+        ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == n_bytes);
+
+        return ok ? 1 : 0;
+}
+
+static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp,
+                                   struct yaffs_obj *obj)
+{
+
+        cp->obj_id = obj->obj_id;
+        cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0;
+        cp->hdr_chunk = obj->hdr_chunk;
+        cp->variant_type = obj->variant_type;
+        cp->deleted = obj->deleted;
+        cp->soft_del = obj->soft_del;
+        cp->unlinked = obj->unlinked;
+        cp->fake = obj->fake;
+        cp->rename_allowed = obj->rename_allowed;
+        cp->unlink_allowed = obj->unlink_allowed;
+        cp->serial = obj->serial;
+        cp->n_data_chunks = obj->n_data_chunks;
+
+        if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+                cp->size_or_equiv_obj = obj->variant.file_variant.file_size;
+        else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+                cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id;
+}
+
+static int taffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
+                                     struct yaffs_checkpt_obj *cp)
+{
+
+        struct yaffs_obj *parent;
+
+        if (obj->variant_type != cp->variant_type) {
+                yaffs_trace(YAFFS_TRACE_ERROR,
+                        "Checkpoint read object %d type %d chunk %d does not match existing object type %d",
+                        cp->obj_id, cp->variant_type, cp->hdr_chunk,
+                        obj->variant_type);
+                return 0;
+        }
+
+        obj->obj_id = cp->obj_id;
+
+        if (cp->parent_id)
+                parent = yaffs_find_or_create_by_number(obj->my_dev,
+                                                        cp->parent_id,
+                                                        YAFFS_OBJECT_TYPE_DIRECTORY);
+        else
+                parent = NULL;
+
+        if (parent) {
+                if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+                        yaffs_trace(YAFFS_TRACE_ALWAYS,
+                                "Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory",
+                                cp->obj_id, cp->parent_id,
+                                cp->variant_type, cp->hdr_chunk,
+                                parent->variant_type);
+                        return 0;
+                }
+                yaffs_add_obj_to_dir(parent, obj);
+        }
+
+        obj->hdr_chunk = cp->hdr_chunk;
+        obj->variant_type = cp->variant_type;
+        obj->deleted = cp->deleted;
+        obj->soft_del = cp->soft_del;
+        obj->unlinked = cp->unlinked;
+        obj->fake = cp->fake;
+        obj->rename_allowed = cp->rename_allowed;
+        obj->unlink_allowed = cp->unlink_allowed;
+        obj->serial = cp->serial;
+        obj->n_data_chunks = cp->n_data_chunks;
+
+        if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+                obj->variant.file_variant.file_size = cp->size_or_equiv_obj;
+        else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+                obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj;
+
+        if (obj->hdr_chunk > 0)
+                obj->lazy_loaded = 1;
+        return 1;
+}
+
+static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
+                                       struct yaffs_tnode *tn, u32 level,
+                                       int chunk_offset)
+{
+        int i;
+        struct yaffs_dev *dev = in->my_dev;
+        int ok = 1;
+
+        if (tn) {
+                if (level > 0) {
+
+                        for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+                                if (tn->internal[i]) {
+                                        ok = yaffs2_checkpt_tnode_worker(in,
+                                                                         tn->
+                                                                         internal
+                                                                         [i],
+                                                                         level -
+                                                                         1,
+                                                                         (chunk_offset
+                                                                          <<
+                                                                          YAFFS_TNODES_INTERNAL_BITS)
+                                                                         + i);
+                                }
+                        }
+                } else if (level == 0) {
+                        u32 base_offset =
+                            chunk_offset << YAFFS_TNODES_LEVEL0_BITS;
+                        ok = (yaffs2_checkpt_wr
+                              (dev, &base_offset,
+                               sizeof(base_offset)) == sizeof(base_offset));
+                        if (ok)
+                                ok = (yaffs2_checkpt_wr
+                                      (dev, tn,
+                                       dev->tnode_size) == dev->tnode_size);
+                }
+        }
+
+        return ok;
+
+}
+
+static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj)
+{
+        u32 end_marker = ~0;
+        int ok = 1;
+
+        if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) {
+                ok = yaffs2_checkpt_tnode_worker(obj,
+                                                 obj->variant.file_variant.top,
+                                                 obj->variant.file_variant.
+                                                 top_level, 0);
+                if (ok)
+                        ok = (yaffs2_checkpt_wr
+                              (obj->my_dev, &end_marker,
+                               sizeof(end_marker)) == sizeof(end_marker));
+        }
+
+        return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
+{
+        u32 base_chunk;
+        int ok = 1;
+        struct yaffs_dev *dev = obj->my_dev;
+        struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant;
+        struct yaffs_tnode *tn;
+        int nread = 0;
+
+        ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) ==
+              sizeof(base_chunk));
+
+        while (ok && (~base_chunk)) {
+                nread++;
+                /* Read level 0 tnode */
+
+                tn = yaffs_get_tnode(dev);
+                if (tn) {
+                        ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) ==
+                              dev->tnode_size);
+                } else {
+                        ok = 0;
+                }
+
+                if (tn && ok)
+                        ok = yaffs_add_find_tnode_0(dev,
+                                                    file_stuct_ptr,
+                                                    base_chunk, tn) ? 1 : 0;
+
+                if (ok)
+                        ok = (yaffs2_checkpt_rd
+                              (dev, &base_chunk,
+                               sizeof(base_chunk)) == sizeof(base_chunk));
+
+        }
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "Checkpoint read tnodes %d records, last %d. ok %d",
+                nread, base_chunk, ok);
+
+        return ok ? 1 : 0;
+}
+
+static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
+{
+        struct yaffs_obj *obj;
+        struct yaffs_checkpt_obj cp;
+        int i;
+        int ok = 1;
+        struct list_head *lh;
+
+        /* Iterate through the objects in each hash entry,
+         * dumping them to the checkpointing stream.
+         */
+
+        for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
+                list_for_each(lh, &dev->obj_bucket[i].list) {
+                        if (lh) {
+                                obj =
+                                    list_entry(lh, struct yaffs_obj, hash_link);
+                                if (!obj->defered_free) {
+                                        yaffs2_obj_checkpt_obj(&cp, obj);
+                                        cp.struct_type = sizeof(cp);
+
+                                        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                                                "Checkpoint write object %d parent %d type %d chunk %d obj addr %p",
+                                                cp.obj_id, cp.parent_id,
+                                                cp.variant_type, cp.hdr_chunk, obj);
+
+                                        ok = (yaffs2_checkpt_wr
+                                              (dev, &cp,
+                                               sizeof(cp)) == sizeof(cp));
+
+                                        if (ok
+                                            && obj->variant_type ==
+                                            YAFFS_OBJECT_TYPE_FILE)
+                                                ok = yaffs2_wr_checkpt_tnodes
+                                                    (obj);
+                                }
+                        }
+                }
+        }
+
+        /* Dump end of list */
+        memset(&cp, 0xFF, sizeof(struct yaffs_checkpt_obj));
+        cp.struct_type = sizeof(cp);
+
+        if (ok)
+                ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+        return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
+{
+        struct yaffs_obj *obj;
+        struct yaffs_checkpt_obj cp;
+        int ok = 1;
+        int done = 0;
+        struct yaffs_obj *hard_list = NULL;
+
+        while (ok && !done) {
+                ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+                if (cp.struct_type != sizeof(cp)) {
+                        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                                "struct size %d instead of %d ok %d",
+                                cp.struct_type, (int)sizeof(cp), ok);
+                        ok = 0;
+                }
+
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "Checkpoint read object %d parent %d type %d chunk %d ",
+                        cp.obj_id, cp.parent_id, cp.variant_type,
+                        cp.hdr_chunk);
+
+                if (ok && cp.obj_id == ~0) {
+                        done = 1;
+                } else if (ok) {
+                        obj =
+                            yaffs_find_or_create_by_number(dev, cp.obj_id,
+                                                           cp.variant_type);
+                        if (obj) {
+                                ok = taffs2_checkpt_obj_to_obj(obj, &cp);
+                                if (!ok)
+                                        break;
+                                if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) {
+                                        ok = yaffs2_rd_checkpt_tnodes(obj);
+                                } else if (obj->variant_type ==
+                                           YAFFS_OBJECT_TYPE_HARDLINK) {
+                                        obj->hard_links.next =
+                                            (struct list_head *)hard_list;
+                                        hard_list = obj;
+                                }
+                        } else {
+                                ok = 0;
+                        }
+                }
+        }
+
+        if (ok)
+                yaffs_link_fixup(dev, hard_list);
+
+        return ok ? 1 : 0;
+}
+
+static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev)
+{
+        u32 checkpt_sum;
+        int ok;
+
+        yaffs2_get_checkpt_sum(dev, &checkpt_sum);
+
+        ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) ==
+              sizeof(checkpt_sum));
+
+        if (!ok)
+                return 0;
+
+        return 1;
+}
+
+static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev)
+{
+        u32 checkpt_sum0;
+        u32 checkpt_sum1;
+        int ok;
+
+        yaffs2_get_checkpt_sum(dev, &checkpt_sum0);
+
+        ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) ==
+              sizeof(checkpt_sum1));
+
+        if (!ok)
+                return 0;
+
+        if (checkpt_sum0 != checkpt_sum1)
+                return 0;
+
+        return 1;
+}
+
+static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev)
+{
+        int ok = 1;
+
+        if (!yaffs2_checkpt_required(dev)) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "skipping checkpoint write");
+                ok = 0;
+        }
+
+        if (ok)
+                ok = yaffs2_checkpt_open(dev, 1);
+
+        if (ok) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "write checkpoint validity");
+                ok = yaffs2_wr_checkpt_validity_marker(dev, 1);
+        }
+        if (ok) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "write checkpoint device");
+                ok = yaffs2_wr_checkpt_dev(dev);
+        }
+        if (ok) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "write checkpoint objects");
+                ok = yaffs2_wr_checkpt_objs(dev);
+        }
+        if (ok) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "write checkpoint validity");
+                ok = yaffs2_wr_checkpt_validity_marker(dev, 0);
+        }
+
+        if (ok)
+                ok = yaffs2_wr_checkpt_sum(dev);
+
+        if (!yaffs_checkpt_close(dev))
+                ok = 0;
+
+        if (ok)
+                dev->is_checkpointed = 1;
+        else
+                dev->is_checkpointed = 0;
+
+        return dev->is_checkpointed;
+}
+
+static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev)
+{
+        int ok = 1;
+
+        if (!dev->param.is_yaffs2)
+                ok = 0;
+
+        if (ok && dev->param.skip_checkpt_rd) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "skipping checkpoint read");
+                ok = 0;
+        }
+
+        if (ok)
+                ok = yaffs2_checkpt_open(dev, 0); /* open for read */
+
+        if (ok) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "read checkpoint validity");
+                ok = yaffs2_rd_checkpt_validity_marker(dev, 1);
+        }
+        if (ok) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "read checkpoint device");
+                ok = yaffs2_rd_checkpt_dev(dev);
+        }
+        if (ok) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "read checkpoint objects");
+                ok = yaffs2_rd_checkpt_objs(dev);
+        }
+        if (ok) {
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "read checkpoint validity");
+                ok = yaffs2_rd_checkpt_validity_marker(dev, 0);
+        }
+
+        if (ok) {
+                ok = yaffs2_rd_checkpt_sum(dev);
+                yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                        "read checkpoint checksum %d", ok);
+        }
+
+        if (!yaffs_checkpt_close(dev))
+                ok = 0;
+
+        if (ok)
+                dev->is_checkpointed = 1;
+        else
+                dev->is_checkpointed = 0;
+
+        return ok ? 1 : 0;
+
+}
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev)
+{
+        if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) {
+                dev->is_checkpointed = 0;
+                yaffs2_checkpt_invalidate_stream(dev);
+        }
+        if (dev->param.sb_dirty_fn)
+                dev->param.sb_dirty_fn(dev);
+}
+
+int yaffs_checkpoint_save(struct yaffs_dev *dev)
+{
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "save entry: is_checkpointed %d",
+                dev->is_checkpointed);
+
+        yaffs_verify_objects(dev);
+        yaffs_verify_blocks(dev);
+        yaffs_verify_free_chunks(dev);
+
+        if (!dev->is_checkpointed) {
+                yaffs2_checkpt_invalidate(dev);
+                yaffs2_wr_checkpt_data(dev);
+        }
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
+                "save exit: is_checkpointed %d",
+                dev->is_checkpointed);
+
+        return dev->is_checkpointed;
+}
+
+int yaffs2_checkpt_restore(struct yaffs_dev *dev)
+{
+        int retval;
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "restore entry: is_checkpointed %d",
+                dev->is_checkpointed);
+
+        retval = yaffs2_rd_checkpt_data(dev);
+
+        if (dev->is_checkpointed) {
+                yaffs_verify_objects(dev);
+                yaffs_verify_blocks(dev);
+                yaffs_verify_free_chunks(dev);
+        }
+
+        yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+                "restore exit: is_checkpointed %d",
+                dev->is_checkpointed);
+
+        return retval;
+}
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
+{
+        /* if new_size > old_file_size.
+         * We're going to be writing a hole.
+         * If the hole is small then write zeros otherwise write a start of hole marker.
+         */
+
+        loff_t old_file_size;
+        int increase;
+        int small_hole;
+        int result = YAFFS_OK;
+        struct yaffs_dev *dev = NULL;
+
+        u8 *local_buffer = NULL;
+
+        int small_increase_ok = 0;
+
+        if (!obj)
+                return YAFFS_FAIL;
+
+        if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+                return YAFFS_FAIL;
+
+        dev = obj->my_dev;
+
+        /* Bail out if not yaffs2 mode */
+        if (!dev->param.is_yaffs2)
+                return YAFFS_OK;
+
+        old_file_size = obj->variant.file_variant.file_size;
+
+        if (new_size <= old_file_size)
+                return YAFFS_OK;
+
+        increase = new_size - old_file_size;
+
+        if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk &&
+            yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
+                small_hole = 1;
+        else
+                small_hole = 0;
+
+        if (small_hole)
+                local_buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+        if (local_buffer) {
+                /* fill hole with zero bytes */
+                int pos = old_file_size;
+                int this_write;
+                int written;
+                memset(local_buffer, 0, dev->data_bytes_per_chunk);
+                small_increase_ok = 1;
+
+                while (increase > 0 && small_increase_ok) {
+                        this_write = increase;
+                        if (this_write > dev->data_bytes_per_chunk)
+                                this_write = dev->data_bytes_per_chunk;
+                        written =
+                            yaffs_do_file_wr(obj, local_buffer, pos, this_write,
+                                             0);
+                        if (written == this_write) {
+                                pos += this_write;
+                                increase -= this_write;
+                        } else {
+                                small_increase_ok = 0;
+                        }
+                }
+
+                yaffs_release_temp_buffer(dev, local_buffer, __LINE__);
+
+                /* If we were out of space then reverse any chunks we've added */
+                if (!small_increase_ok)
+                        yaffs_resize_file_down(obj, old_file_size);
+        }
+
+        if (!small_increase_ok &&
+            obj->parent &&
+            obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+            obj->parent->obj_id != YAFFS_OBJECTID_DELETED) {
+                /* Write a hole start header with the old file size */
+                yaffs_update_oh(obj, NULL, 0, 1, 0, NULL);
+        }
+
+        return result;
+
+}
+
+struct yaffs_block_index {
+        int seq;
+        int block;
+};
+
+static int yaffs2_ybicmp(const void *a, const void *b)
+{
+        int aseq = ((struct yaffs_block_index *)a)->seq;
+        int bseq = ((struct yaffs_block_index *)b)->seq;
+        int ablock = ((struct yaffs_block_index *)a)->block;
+        int bblock = ((struct yaffs_block_index *)b)->block;
+        if (aseq == bseq)
+                return ablock - bblock;
+        else
+                return aseq - bseq;
+}
+
+int yaffs2_scan_backwards(struct yaffs_dev *dev)
+{
+        struct yaffs_ext_tags tags;
+        int blk;
+        int block_iter;
+        int start_iter;
+        int end_iter;
+        int n_to_scan = 0;
+
+        int chunk;
+        int result;
+        int c;
+        int deleted;
+        enum yaffs_block_state state;
+        struct yaffs_obj *hard_list = NULL;
+        struct yaffs_block_info *bi;
+        u32 seq_number;
+        struct yaffs_obj_hdr *oh;
+        struct yaffs_obj *in;
+        struct yaffs_obj *parent;
+        int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+        int is_unlinked;
+        u8 *chunk_data;
+
+        int file_size;
+        int is_shrink;
+        int found_chunks;
+        int equiv_id;
+        int alloc_failed = 0;
+
+        struct yaffs_block_index *block_index = NULL;
+        int alt_block_index = 0;
+
+        yaffs_trace(YAFFS_TRACE_SCAN,
+                "yaffs2_scan_backwards starts  intstartblk %d intendblk %d...",
+                dev->internal_start_block, dev->internal_end_block);
+
+        dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+        block_index = kmalloc(n_blocks * sizeof(struct yaffs_block_index),
+                        GFP_NOFS);
+
+        if (!block_index) {
+                block_index =
+                    vmalloc(n_blocks * sizeof(struct yaffs_block_index));
+                alt_block_index = 1;
+        }
+
+        if (!block_index) {
+                yaffs_trace(YAFFS_TRACE_SCAN,
+                        "yaffs2_scan_backwards() could not allocate block index!"
+                        );
+                return YAFFS_FAIL;
+        }
+
+        dev->blocks_in_checkpt = 0;
+
+        chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
+
+        /* Scan all the blocks to determine their state */
+        bi = dev->block_info;
+        for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+             blk++) {
+                yaffs_clear_chunk_bits(dev, blk);
+                bi->pages_in_use = 0;
+                bi->soft_del_pages = 0;
+
+                yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+                bi->block_state = state;
+                bi->seq_number = seq_number;
+
+                if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA)
+                        bi->block_state = state = YAFFS_BLOCK_STATE_CHECKPOINT;
+                if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+                        bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
+
+                yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
+                        "Block scanning block %d state %d seq %d",
+                        blk, state, seq_number);
+
+                if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+                        dev->blocks_in_checkpt++;
+
+                } else if (state == YAFFS_BLOCK_STATE_DEAD) {
+                        yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+                                "block %d is bad", blk);
+                } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+                        yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
+                        dev->n_erased_blocks++;
+                        dev->n_free_chunks += dev->param.chunks_per_block;
+                } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+                        /* Determine the highest sequence number */
+                        if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+                            seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+
+                                block_index[n_to_scan].seq = seq_number;
+                                block_index[n_to_scan].block = blk;
+
+                                n_to_scan++;
+
+                                if (seq_number >= dev->seq_number)
+                                        dev->seq_number = seq_number;
+                        } else {
+                                /* TODO: Nasty sequence number! */
+                                yaffs_trace(YAFFS_TRACE_SCAN,
+                                        "Block scanning block %d has bad sequence number %d",
+                                        blk, seq_number);
+
+                        }
+                }
+                bi++;
+        }
+
+        yaffs_trace(YAFFS_TRACE_SCAN, "%d blocks to be sorted...", n_to_scan);
+
+        cond_resched();
+
+        /* Sort the blocks by sequence number */
+        sort(block_index, n_to_scan, sizeof(struct yaffs_block_index),
+                   yaffs2_ybicmp, NULL);
+
+        cond_resched();
+
+        yaffs_trace(YAFFS_TRACE_SCAN, "...done");
+
+        /* Now scan the blocks looking at the data. */
+        start_iter = 0;
+        end_iter = n_to_scan - 1;
+        yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "%d blocks to scan", n_to_scan);
+
+        /* For each block.... backwards */
+        for (block_iter = end_iter; !alloc_failed && block_iter >= start_iter;
+             block_iter--) {
+                /* Cooperative multitasking! This loop can run for so
+                   long that watchdog timers expire. */
+                cond_resched();
+
+                /* get the block to scan in the correct order */
+                blk = block_index[block_iter].block;
+
+                bi = yaffs_get_block_info(dev, blk);
+
+                state = bi->block_state;
+
+                deleted = 0;
+
+                /* For each chunk in each block that needs scanning.... */
+                found_chunks = 0;
+                for (c = dev->param.chunks_per_block - 1;
+                     !alloc_failed && c >= 0 &&
+                     (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+                      state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
+                        /* Scan backwards...
+                         * Read the tags and decide what to do
+                         */
+
+                        chunk = blk * dev->param.chunks_per_block + c;
+
+                        result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
+                                                          &tags);
+
+                        /* Let's have a good look at this chunk... */
+
+                        if (!tags.chunk_used) {
+                                /* An unassigned chunk in the block.
+                                 * If there are used chunks after this one, then
+                                 * it is a chunk that was skipped due to failing the erased
+                                 * check. Just skip it so that it can be deleted.
+                                 * But, more typically, We get here when this is an unallocated
+                                 * chunk and his means that either the block is empty or
+                                 * this is the one being allocated from
+                                 */
+
+                                if (found_chunks) {
+                                        /* This is a chunk that was skipped due to failing the erased check */
+                                } else if (c == 0) {
+                                        /* We're looking at the first chunk in the block so the block is unused */
+                                        state = YAFFS_BLOCK_STATE_EMPTY;
+                                        dev->n_erased_blocks++;
+                                } else {
+                                        if (state ==
+                                            YAFFS_BLOCK_STATE_NEEDS_SCANNING
+                                            || state ==
+                                            YAFFS_BLOCK_STATE_ALLOCATING) {
+                                                if (dev->seq_number ==
+                                                    bi->seq_number) {
+                                                        /* this is the block being allocated from */
+
+                                                        yaffs_trace(YAFFS_TRACE_SCAN,
+                                                                " Allocating from %d %d",
+                                                                blk, c);
+
+                                                        state =
+                                                            YAFFS_BLOCK_STATE_ALLOCATING;
+                                                        dev->alloc_block = blk;
+                                                        dev->alloc_page = c;
+                                                        dev->
+                                                            alloc_block_finder =
+                                                            blk;
+                                                } else {
+                                                        /* This is a partially written block that is not
+                                                         * the current allocation block.
+                                                         */
+
+                                                        yaffs_trace(YAFFS_TRACE_SCAN,
+                                                                "Partially written block %d detected",
+                                                                blk);
+                                                }
+                                        }
+                                }
+
+                                dev->n_free_chunks++;
+
+                        } else if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED) {
+                                yaffs_trace(YAFFS_TRACE_SCAN,
+                                        " Unfixed ECC in chunk(%d:%d), chunk ignored",
+                                        blk, c);
+
+                                dev->n_free_chunks++;
+
+                        } else if (tags.obj_id > YAFFS_MAX_OBJECT_ID ||
+                                   tags.chunk_id > YAFFS_MAX_CHUNK_ID ||
+                                   (tags.chunk_id > 0
+                                    && tags.n_bytes > dev->data_bytes_per_chunk)
+                                   || tags.seq_number != bi->seq_number) {
+                                yaffs_trace(YAFFS_TRACE_SCAN,
+                                        "Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored",
+                                        blk, c, tags.obj_id,
+                                        tags.chunk_id, tags.n_bytes);
+
+                                dev->n_free_chunks++;
+
+                        } else if (tags.chunk_id > 0) {
+                                /* chunk_id > 0 so it is a data chunk... */
+                                unsigned int endpos;
+                                u32 chunk_base =
+                                    (tags.chunk_id -
+                                     1) * dev->data_bytes_per_chunk;
+
+                                found_chunks = 1;
+
+                                yaffs_set_chunk_bit(dev, blk, c);
+                                bi->pages_in_use++;
+
+                                in = yaffs_find_or_create_by_number(dev,
+                                                                    tags.obj_id,
+                                                                    YAFFS_OBJECT_TYPE_FILE);
+                                if (!in) {
+                                        /* Out of memory */
+                                        alloc_failed = 1;
+                                }
+
+                                if (in &&
+                                    in->variant_type == YAFFS_OBJECT_TYPE_FILE
+                                    && chunk_base <
+                                    in->variant.file_variant.shrink_size) {
+                                        /* This has not been invalidated by a resize */
+                                        if (!yaffs_put_chunk_in_file
+                                            (in, tags.chunk_id, chunk, -1)) {
+                                                alloc_failed = 1;
+                                        }
+
+                                        /* File size is calculated by looking at the data chunks if we have not
+                                         * seen an object header yet. Stop this practice once we find an object header.
+                                         */
+                                        endpos = chunk_base + tags.n_bytes;
+
+                                        if (!in->valid &&       /* have not got an object header yet */
+                                            in->variant.file_variant.
+                                            scanned_size < endpos) {
+                                                in->variant.file_variant.
+                                                    scanned_size = endpos;
+                                                in->variant.file_variant.
+                                                    file_size = endpos;
+                                        }
+
+                                } else if (in) {
+                                        /* This chunk has been invalidated by a resize, or a past file deletion
+                                         * so delete the chunk*/
+                                        yaffs_chunk_del(dev, chunk, 1,
+                                                        __LINE__);
+
+                                }
+                        } else {
+                                /* chunk_id == 0, so it is an ObjectHeader.
+                                 * Thus, we read in the object header and make the object
+                                 */
+                                found_chunks = 1;
+
+                                yaffs_set_chunk_bit(dev, blk, c);
+                                bi->pages_in_use++;
+
+                                oh = NULL;
+                                in = NULL;
+
+                                if (tags.extra_available) {
+                                        in = yaffs_find_or_create_by_number(dev,
+                                                                            tags.
+                                                                            obj_id,
+                                                                            tags.
+                                                                            extra_obj_type);
+                                        if (!in)
+                                                alloc_failed = 1;
+                                }
+
+                                if (!in ||
+                                    (!in->valid && dev->param.disable_lazy_load)
+                                    || tags.extra_shadows || (!in->valid
+                                                              && (tags.obj_id ==
+                                                                  YAFFS_OBJECTID_ROOT
+                                                                  || tags.
+                                                                  obj_id ==
+                                                                  YAFFS_OBJECTID_LOSTNFOUND)))
+                                {
+
+                                        /* If we don't have  valid info then we need to read the chunk
+                                         * TODO In future we can probably defer reading the chunk and
+                                         * living with invalid data until needed.
+                                         */
+
+                                        result = yaffs_rd_chunk_tags_nand(dev,
+                                                                          chunk,
+                                                                          chunk_data,
+                                                                          NULL);
+
+                                        oh = (struct yaffs_obj_hdr *)chunk_data;
+
+                                        if (dev->param.inband_tags) {
+                                                /* Fix up the header if they got corrupted by inband tags */
+                                                oh->shadows_obj =
+                                                    oh->inband_shadowed_obj_id;
+                                                oh->is_shrink =
+                                                    oh->inband_is_shrink;
+                                        }
+
+                                        if (!in) {
+                                                in = yaffs_find_or_create_by_number(dev, tags.obj_id, oh->type);
+                                                if (!in)
+                                                        alloc_failed = 1;
+                                        }
+
+                                }
+
+                                if (!in) {
+                                        /* TODO Hoosterman we have a problem! */
+                                        yaffs_trace(YAFFS_TRACE_ERROR,
+                                                "yaffs tragedy: Could not make object for object  %d at chunk %d during scan",
+                                                tags.obj_id, chunk);
+                                        continue;
+                                }
+
+                                if (in->valid) {
+                                        /* We have already filled this one.
+                                         * We have a duplicate that will be discarded, but
+                                         * we first have to suck out resize info if it is a file.
+                                         */
+
+                                        if ((in->variant_type ==
+                                             YAFFS_OBJECT_TYPE_FILE) && ((oh
+                                                                          &&
+                                                                          oh->
+                                                                          type
+                                                                          ==
+                                                                          YAFFS_OBJECT_TYPE_FILE)
+                                                                         ||
+                                                                         (tags.
+                                                                          extra_available
+                                                                          &&
+                                                                          tags.
+                                                                          extra_obj_type
+                                                                          ==
+                                                                          YAFFS_OBJECT_TYPE_FILE)))
+                                        {
+                                                u32 this_size =
+                                                    (oh) ? oh->
+                                                    file_size :
+                                                    tags.extra_length;
+                                                u32 parent_obj_id =
+                                                    (oh) ? oh->parent_obj_id :
+                                                    tags.extra_parent_id;
+
+                                                is_shrink =
+                                                    (oh) ? oh->
+                                                    is_shrink :
+                                                    tags.extra_is_shrink;
+
+                                                /* If it is deleted (unlinked at start also means deleted)
+                                                 * we treat the file size as being zeroed at this point.
+                                                 */
+                                                if (parent_obj_id ==
+                                                    YAFFS_OBJECTID_DELETED
+                                                    || parent_obj_id ==
+                                                    YAFFS_OBJECTID_UNLINKED) {
+                                                        this_size = 0;
+                                                        is_shrink = 1;
+                                                }
+
+                                                if (is_shrink
+                                                    && in->variant.file_variant.
+                                                    shrink_size > this_size)
+                                                        in->variant.
+                                                            file_variant.
+                                                            shrink_size =
+                                                            this_size;
+
+                                                if (is_shrink)
+                                                        bi->has_shrink_hdr = 1;
+
+                                        }
+                                        /* Use existing - destroy this one. */
+                                        yaffs_chunk_del(dev, chunk, 1,
+                                                        __LINE__);
+
+                                }
+
+                                if (!in->valid && in->variant_type !=
+                                    (oh ? oh->type : tags.extra_obj_type))
+                                        yaffs_trace(YAFFS_TRACE_ERROR,
+                                                "yaffs tragedy: Bad object type, %d != %d, for object %d at chunk %d during scan",
+                                                oh ?
+                                                oh->type : tags.extra_obj_type,
+                                                in->variant_type, tags.obj_id,
+                                                chunk);
+
+                                if (!in->valid &&
+                                    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+                                     tags.obj_id ==
+                                     YAFFS_OBJECTID_LOSTNFOUND)) {
+                                        /* We only load some info, don't fiddle with directory structure */
+                                        in->valid = 1;
+
+                                        if (oh) {
+
+                                                in->yst_mode = oh->yst_mode;
+                                                yaffs_load_attribs(in, oh);
+                                                in->lazy_loaded = 0;
+                                        } else {
+                                                in->lazy_loaded = 1;
+                                        }
+                                        in->hdr_chunk = chunk;
+
+                                } else if (!in->valid) {
+                                        /* we need to load this info */
+
+                                        in->valid = 1;
+                                        in->hdr_chunk = chunk;
+
+                                        if (oh) {
+                                                in->variant_type = oh->type;
+
+                                                in->yst_mode = oh->yst_mode;
+                                                yaffs_load_attribs(in, oh);
+
+                                                if (oh->shadows_obj > 0)
+                                                        yaffs_handle_shadowed_obj
+                                                            (dev,
+                                                             oh->shadows_obj,
+                                                             1);
+
+                                                yaffs_set_obj_name_from_oh(in,
+                                                                           oh);
+                                                parent =
+                                                    yaffs_find_or_create_by_number
+                                                    (dev, oh->parent_obj_id,
+                                                     YAFFS_OBJECT_TYPE_DIRECTORY);
+
+                                                file_size = oh->file_size;
+                                                is_shrink = oh->is_shrink;
+                                                equiv_id = oh->equiv_id;
+
+                                        } else {
+                                                in->variant_type =
+                                                    tags.extra_obj_type;
+                                                parent =
+                                                    yaffs_find_or_create_by_number
+                                                    (dev, tags.extra_parent_id,
+                                                     YAFFS_OBJECT_TYPE_DIRECTORY);
+                                                file_size = tags.extra_length;
+                                                is_shrink =
+                                                    tags.extra_is_shrink;
+                                                equiv_id = tags.extra_equiv_id;
+                                                in->lazy_loaded = 1;
+
+                                        }
+                                        in->dirty = 0;
+
+                                        if (!parent)
+                                                alloc_failed = 1;
+
+                                        /* directory stuff...
+                                         * hook up to parent
+                                         */
+
+                                        if (parent && parent->variant_type ==
+                                            YAFFS_OBJECT_TYPE_UNKNOWN) {
+                                                /* Set up as a directory */
+                                                parent->variant_type =
+                                                    YAFFS_OBJECT_TYPE_DIRECTORY;
+                                                INIT_LIST_HEAD(&parent->
+                                                               variant.dir_variant.children);
+                                        } else if (!parent
+                                                   || parent->variant_type !=
+                                                   YAFFS_OBJECT_TYPE_DIRECTORY) {
+                                                /* Hoosterman, another problem....
+                                                 * We're trying to use a non-directory as a directory
+                                                 */
+
+                                                yaffs_trace(YAFFS_TRACE_ERROR,
+                                                        "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+                                                        );
+                                                parent = dev->lost_n_found;
+                                        }
+
+                                        yaffs_add_obj_to_dir(parent, in);
+
+                                        is_unlinked = (parent == dev->del_dir)
+                                            || (parent == dev->unlinked_dir);
+
+                                        if (is_shrink) {
+                                                /* Mark the block as having a shrink header */
+                                                bi->has_shrink_hdr = 1;
+                                        }
+
+                                        /* Note re hardlinks.
+                                         * Since we might scan a hardlink before its equivalent object is scanned
+                                         * we put them all in a list.
+                                         * After scanning is complete, we should have all the objects, so we run
+                                         * through this list and fix up all the chains.
+                                         */
+
+                                        switch (in->variant_type) {
+                                        case YAFFS_OBJECT_TYPE_UNKNOWN:
+                                                /* Todo got a problem */
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_FILE:
+
+                                                if (in->variant.
+                                                    file_variant.scanned_size <
+                                                    file_size) {
+                                                        /* This covers the case where the file size is greater
+                                                         * than where the data is
+                                                         * This will happen if the file is resized to be larger
+                                                         * than its current data extents.
+                                                         */
+                                                        in->variant.
+                                                            file_variant.
+                                                            file_size =
+                                                            file_size;
+                                                        in->variant.
+                                                            file_variant.
+                                                            scanned_size =
+                                                            file_size;
+                                                }
+
+                                                if (in->variant.file_variant.
+                                                    shrink_size > file_size)
+                                                        in->variant.
+                                                            file_variant.
+                                                            shrink_size =
+                                                            file_size;
+
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_HARDLINK:
+                                                if (!is_unlinked) {
+                                                        in->variant.
+                                                            hardlink_variant.
+                                                            equiv_id = equiv_id;
+                                                        in->hard_links.next =
+                                                            (struct list_head *)
+                                                            hard_list;
+                                                        hard_list = in;
+                                                }
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_DIRECTORY:
+                                                /* Do nothing */
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_SPECIAL:
+                                                /* Do nothing */
+                                                break;
+                                        case YAFFS_OBJECT_TYPE_SYMLINK:
+                                                if (oh) {
+                                                        in->variant.
+                                                            symlink_variant.
+                                                            alias =
+                                                            yaffs_clone_str(oh->
+                                                                            alias);
+                                                        if (!in->variant.
+                                                            symlink_variant.
+                                                            alias)
+                                                                alloc_failed =
+                                                                    1;
+                                                }
+                                                break;
+                                        }
+
+                                }
+
+                        }
+
+                }               /* End of scanning for each chunk */
+
+                if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+                        /* If we got this far while scanning, then the block is fully allocated. */
+                        state = YAFFS_BLOCK_STATE_FULL;
+                }
+
+                bi->block_state = state;
+
+                /* Now let's see if it was dirty */
+                if (bi->pages_in_use == 0 &&
+                    !bi->has_shrink_hdr &&
+                    bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+                        yaffs_block_became_dirty(dev, blk);
+                }
+
+        }
+
+        yaffs_skip_rest_of_block(dev);
+
+        if (alt_block_index)
+                vfree(block_index);
+        else
+                kfree(block_index);
+
+        /* Ok, we've done all the scanning.
+         * Fix up the hard link chains.
+         * We should now have scanned all the objects, now it's time to add these
+         * hardlinks.
+         */
+        yaffs_link_fixup(dev, hard_list);
+
+        yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
+
+        if (alloc_failed)
+                return YAFFS_FAIL;
+
+        yaffs_trace(YAFFS_TRACE_SCAN, "yaffs2_scan_backwards ends");
+
+        return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_yaffs2.h b/fs/yaffs2/yaffs_yaffs2.h
new file mode 100644
index 00000000000..e1a9287fc50
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.h
@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS2_H__
+#define __YAFFS_YAFFS2_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+                                   struct yaffs_block_info *bi);
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+                                    struct yaffs_block_info *bi);
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi);
+u32 yaffs2_find_refresh_block(struct yaffs_dev *dev);
+int yaffs2_checkpt_required(struct yaffs_dev *dev);
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev);
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev);
+int yaffs2_checkpt_save(struct yaffs_dev *dev);
+int yaffs2_checkpt_restore(struct yaffs_dev *dev);
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size);
+int yaffs2_scan_backwards(struct yaffs_dev *dev);
+
+#endif
diff --git a/fs/yaffs2/yportenv.h b/fs/yaffs2/yportenv.h
new file mode 100644
index 00000000000..8183425448c
--- /dev/null
+++ b/fs/yaffs2/yportenv.h
@@ -0,0 +1,70 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YPORTENV_LINUX_H__
+#define __YPORTENV_LINUX_H__
+
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/xattr.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/sort.h>
+#include <linux/bitops.h>
+
+#define YCHAR char
+#define YUCHAR unsigned char
+#define _Y(x)     x
+
+#define YAFFS_LOSTNFOUND_NAME           "lost+found"
+#define YAFFS_LOSTNFOUND_PREFIX         "obj"
+
+
+#define YAFFS_ROOT_MODE                 0755
+#define YAFFS_LOSTNFOUND_MODE           0700
+
+#define Y_CURRENT_TIME CURRENT_TIME.tv_sec
+#define Y_TIME_CONVERT(x) (x).tv_sec
+
+#define compile_time_assertion(assertion) \
+        ({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
+
+
+#ifndef Y_DUMP_STACK
+#define Y_DUMP_STACK() dump_stack()
+#endif
+
+#define yaffs_trace(msk, fmt, ...) do { \
+        if(yaffs_trace_mask & (msk)) \
+                printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__); \
+} while(0)
+
+#ifndef YBUG
+#define YBUG() do {\
+        yaffs_trace(YAFFS_TRACE_BUG,\
+                "bug " __FILE__ " %d",\
+                __LINE__);\
+        Y_DUMP_STACK();\
+} while (0)
+#endif
+
+#endif