[PATCH] ext4: initial copy of files from ext3

Start of the ext4 patch series.  See Documentation/filesystems/ext4.txt for
details.

This is a simple copy of the files in fs/ext3 to fs/ext4 and
/usr/incude/linux/ext3* to /usr/include/ex4*

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 1383 insertions, 0 deletions

diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
new file mode 100644
index 000000000000..11cca1bdc0c7
--- /dev/null
+++ b/include/linux/ext4_fs.h
@@ -0,0 +1,885 @@
+/*
+ *  linux/include/linux/ext3_fs.h
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  from
+ *
+ *  linux/include/linux/minix_fs.h
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#ifndef _LINUX_EXT3_FS_H
+#define _LINUX_EXT3_FS_H
+
+#include <linux/types.h>
+#include <linux/magic.h>
+
+/*
+ * The second extended filesystem constants/structures
+ */
+
+/*
+ * Define EXT3FS_DEBUG to produce debug messages
+ */
+#undef EXT3FS_DEBUG
+
+/*
+ * Define EXT3_RESERVATION to reserve data blocks for expanding files
+ */
+#define EXT3_DEFAULT_RESERVE_BLOCKS     8
+/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
+#define EXT3_MAX_RESERVE_BLOCKS         1027
+#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
+/*
+ * Always enable hashed directories
+ */
+#define CONFIG_EXT3_INDEX
+
+/*
+ * Debug code
+ */
+#ifdef EXT3FS_DEBUG
+#define ext3_debug(f, a...)                                             \
+        do {                                                            \
+                printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \
+                        __FILE__, __LINE__, __FUNCTION__);              \
+                printk (KERN_DEBUG f, ## a);                            \
+        } while (0)
+#else
+#define ext3_debug(f, a...)     do {} while (0)
+#endif
+
+/*
+ * Special inodes numbers
+ */
+#define EXT3_BAD_INO             1      /* Bad blocks inode */
+#define EXT3_ROOT_INO            2      /* Root inode */
+#define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */
+#define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */
+#define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */
+#define EXT3_JOURNAL_INO         8      /* Journal inode */
+
+/* First non-reserved inode for old ext3 filesystems */
+#define EXT3_GOOD_OLD_FIRST_INO 11
+
+/*
+ * Maximal count of links to a file
+ */
+#define EXT3_LINK_MAX           32000
+
+/*
+ * Macro-instructions used to manage several block sizes
+ */
+#define EXT3_MIN_BLOCK_SIZE             1024
+#define EXT3_MAX_BLOCK_SIZE             4096
+#define EXT3_MIN_BLOCK_LOG_SIZE           10
+#ifdef __KERNEL__
+# define EXT3_BLOCK_SIZE(s)             ((s)->s_blocksize)
+#else
+# define EXT3_BLOCK_SIZE(s)             (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
+#endif
+#define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
+#ifdef __KERNEL__
+# define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
+#else
+# define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
+#endif
+#ifdef __KERNEL__
+#define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)
+#define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)
+#define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)
+#else
+#define EXT3_INODE_SIZE(s)      (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
+                                 EXT3_GOOD_OLD_INODE_SIZE : \
+                                 (s)->s_inode_size)
+#define EXT3_FIRST_INO(s)       (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
+                                 EXT3_GOOD_OLD_FIRST_INO : \
+                                 (s)->s_first_ino)
+#endif
+
+/*
+ * Macro-instructions used to manage fragments
+ */
+#define EXT3_MIN_FRAG_SIZE              1024
+#define EXT3_MAX_FRAG_SIZE              4096
+#define EXT3_MIN_FRAG_LOG_SIZE            10
+#ifdef __KERNEL__
+# define EXT3_FRAG_SIZE(s)              (EXT3_SB(s)->s_frag_size)
+# define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_SB(s)->s_frags_per_block)
+#else
+# define EXT3_FRAG_SIZE(s)              (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
+# define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
+#endif
+
+/*
+ * Structure of a blocks group descriptor
+ */
+struct ext3_group_desc
+{
+        __le32  bg_block_bitmap;                /* Blocks bitmap block */
+        __le32  bg_inode_bitmap;                /* Inodes bitmap block */
+        __le32  bg_inode_table;         /* Inodes table block */
+        __le16  bg_free_blocks_count;   /* Free blocks count */
+        __le16  bg_free_inodes_count;   /* Free inodes count */
+        __le16  bg_used_dirs_count;     /* Directories count */
+        __u16   bg_pad;
+        __le32  bg_reserved[3];
+};
+
+/*
+ * Macro-instructions used to manage group descriptors
+ */
+#ifdef __KERNEL__
+# define EXT3_BLOCKS_PER_GROUP(s)       (EXT3_SB(s)->s_blocks_per_group)
+# define EXT3_DESC_PER_BLOCK(s)         (EXT3_SB(s)->s_desc_per_block)
+# define EXT3_INODES_PER_GROUP(s)       (EXT3_SB(s)->s_inodes_per_group)
+# define EXT3_DESC_PER_BLOCK_BITS(s)    (EXT3_SB(s)->s_desc_per_block_bits)
+#else
+# define EXT3_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
+# define EXT3_DESC_PER_BLOCK(s)         (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
+# define EXT3_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
+#endif
+
+/*
+ * Constants relative to the data blocks
+ */
+#define EXT3_NDIR_BLOCKS                12
+#define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS
+#define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)
+#define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)
+#define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)
+
+/*
+ * Inode flags
+ */
+#define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */
+#define EXT3_UNRM_FL                    0x00000002 /* Undelete */
+#define EXT3_COMPR_FL                   0x00000004 /* Compress file */
+#define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */
+#define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */
+#define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */
+#define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */
+#define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */
+/* Reserved for compression usage... */
+#define EXT3_DIRTY_FL                   0x00000100
+#define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
+#define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */
+#define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */
+/* End compression flags --- maybe not all used */
+#define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */
+#define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */
+#define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
+#define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
+#define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
+#define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
+#define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */
+
+#define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
+#define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
+
+/*
+ * Inode dynamic state flags
+ */
+#define EXT3_STATE_JDATA                0x00000001 /* journaled data exists */
+#define EXT3_STATE_NEW                  0x00000002 /* inode is newly created */
+#define EXT3_STATE_XATTR                0x00000004 /* has in-inode xattrs */
+
+/* Used to pass group descriptor data when online resize is done */
+struct ext3_new_group_input {
+        __u32 group;            /* Group number for this data */
+        __u32 block_bitmap;     /* Absolute block number of block bitmap */
+        __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
+        __u32 inode_table;      /* Absolute block number of inode table start */
+        __u32 blocks_count;     /* Total number of blocks in this group */
+        __u16 reserved_blocks;  /* Number of reserved blocks in this group */
+        __u16 unused;
+};
+
+/* The struct ext3_new_group_input in kernel space, with free_blocks_count */
+struct ext3_new_group_data {
+        __u32 group;
+        __u32 block_bitmap;
+        __u32 inode_bitmap;
+        __u32 inode_table;
+        __u32 blocks_count;
+        __u16 reserved_blocks;
+        __u16 unused;
+        __u32 free_blocks_count;
+};
+
+
+/*
+ * ioctl commands
+ */
+#define EXT3_IOC_GETFLAGS               FS_IOC_GETFLAGS
+#define EXT3_IOC_SETFLAGS               FS_IOC_SETFLAGS
+#define EXT3_IOC_GETVERSION             _IOR('f', 3, long)
+#define EXT3_IOC_SETVERSION             _IOW('f', 4, long)
+#define EXT3_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
+#define EXT3_IOC_GROUP_ADD              _IOW('f', 8,struct ext3_new_group_input)
+#define EXT3_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
+#define EXT3_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
+#ifdef CONFIG_JBD_DEBUG
+#define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
+#endif
+#define EXT3_IOC_GETRSVSZ               _IOR('f', 5, long)
+#define EXT3_IOC_SETRSVSZ               _IOW('f', 6, long)
+
+/*
+ * ioctl commands in 32 bit emulation
+ */
+#define EXT3_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
+#define EXT3_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
+#define EXT3_IOC32_GETVERSION           _IOR('f', 3, int)
+#define EXT3_IOC32_SETVERSION           _IOW('f', 4, int)
+#define EXT3_IOC32_GETRSVSZ             _IOR('f', 5, int)
+#define EXT3_IOC32_SETRSVSZ             _IOW('f', 6, int)
+#define EXT3_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
+#ifdef CONFIG_JBD_DEBUG
+#define EXT3_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
+#endif
+#define EXT3_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
+#define EXT3_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
+
+
+/*
+ *  Mount options
+ */
+struct ext3_mount_options {
+        unsigned long s_mount_opt;
+        uid_t s_resuid;
+        gid_t s_resgid;
+        unsigned long s_commit_interval;
+#ifdef CONFIG_QUOTA
+        int s_jquota_fmt;
+        char *s_qf_names[MAXQUOTAS];
+#endif
+};
+
+/*
+ * Structure of an inode on the disk
+ */
+struct ext3_inode {
+        __le16  i_mode;         /* File mode */
+        __le16  i_uid;          /* Low 16 bits of Owner Uid */
+        __le32  i_size;         /* Size in bytes */
+        __le32  i_atime;        /* Access time */
+        __le32  i_ctime;        /* Creation time */
+        __le32  i_mtime;        /* Modification time */
+        __le32  i_dtime;        /* Deletion Time */
+        __le16  i_gid;          /* Low 16 bits of Group Id */
+        __le16  i_links_count;  /* Links count */
+        __le32  i_blocks;       /* Blocks count */
+        __le32  i_flags;        /* File flags */
+        union {
+                struct {
+                        __u32  l_i_reserved1;
+                } linux1;
+                struct {
+                        __u32  h_i_translator;
+                } hurd1;
+                struct {
+                        __u32  m_i_reserved1;
+                } masix1;
+        } osd1;                         /* OS dependent 1 */
+        __le32  i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
+        __le32  i_generation;   /* File version (for NFS) */
+        __le32  i_file_acl;     /* File ACL */
+        __le32  i_dir_acl;      /* Directory ACL */
+        __le32  i_faddr;        /* Fragment address */
+        union {
+                struct {
+                        __u8    l_i_frag;       /* Fragment number */
+                        __u8    l_i_fsize;      /* Fragment size */
+                        __u16   i_pad1;
+                        __le16  l_i_uid_high;   /* these 2 fields    */
+                        __le16  l_i_gid_high;   /* were reserved2[0] */
+                        __u32   l_i_reserved2;
+                } linux2;
+                struct {
+                        __u8    h_i_frag;       /* Fragment number */
+                        __u8    h_i_fsize;      /* Fragment size */
+                        __u16   h_i_mode_high;
+                        __u16   h_i_uid_high;
+                        __u16   h_i_gid_high;
+                        __u32   h_i_author;
+                } hurd2;
+                struct {
+                        __u8    m_i_frag;       /* Fragment number */
+                        __u8    m_i_fsize;      /* Fragment size */
+                        __u16   m_pad1;
+                        __u32   m_i_reserved2[2];
+                } masix2;
+        } osd2;                         /* OS dependent 2 */
+        __le16  i_extra_isize;
+        __le16  i_pad1;
+};
+
+#define i_size_high     i_dir_acl
+
+#if defined(__KERNEL__) || defined(__linux__)
+#define i_reserved1     osd1.linux1.l_i_reserved1
+#define i_frag          osd2.linux2.l_i_frag
+#define i_fsize         osd2.linux2.l_i_fsize
+#define i_uid_low       i_uid
+#define i_gid_low       i_gid
+#define i_uid_high      osd2.linux2.l_i_uid_high
+#define i_gid_high      osd2.linux2.l_i_gid_high
+#define i_reserved2     osd2.linux2.l_i_reserved2
+
+#elif defined(__GNU__)
+
+#define i_translator    osd1.hurd1.h_i_translator
+#define i_frag          osd2.hurd2.h_i_frag;
+#define i_fsize         osd2.hurd2.h_i_fsize;
+#define i_uid_high      osd2.hurd2.h_i_uid_high
+#define i_gid_high      osd2.hurd2.h_i_gid_high
+#define i_author        osd2.hurd2.h_i_author
+
+#elif defined(__masix__)
+
+#define i_reserved1     osd1.masix1.m_i_reserved1
+#define i_frag          osd2.masix2.m_i_frag
+#define i_fsize         osd2.masix2.m_i_fsize
+#define i_reserved2     osd2.masix2.m_i_reserved2
+
+#endif /* defined(__KERNEL__) || defined(__linux__) */
+
+/*
+ * File system states
+ */
+#define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
+#define EXT3_ERROR_FS                   0x0002  /* Errors detected */
+#define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
+
+/*
+ * Mount flags
+ */
+#define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */
+#define EXT3_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
+#define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */
+#define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */
+#define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
+#define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
+#define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
+#define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
+#define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
+#define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */
+#define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
+#define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
+#define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
+#define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
+#define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
+#define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
+#define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
+#define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
+#define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */
+#define EXT3_MOUNT_BARRIER              0x20000 /* Use block barriers */
+#define EXT3_MOUNT_NOBH                 0x40000 /* No bufferheads */
+#define EXT3_MOUNT_QUOTA                0x80000 /* Some quota option set */
+#define EXT3_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
+#define EXT3_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
+
+/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
+#ifndef _LINUX_EXT2_FS_H
+#define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
+#define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
+#define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
+                                         EXT3_MOUNT_##opt)
+#else
+#define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
+#define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
+#define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
+#endif
+
+#define ext3_set_bit                    ext2_set_bit
+#define ext3_set_bit_atomic             ext2_set_bit_atomic
+#define ext3_clear_bit                  ext2_clear_bit
+#define ext3_clear_bit_atomic           ext2_clear_bit_atomic
+#define ext3_test_bit                   ext2_test_bit
+#define ext3_find_first_zero_bit        ext2_find_first_zero_bit
+#define ext3_find_next_zero_bit         ext2_find_next_zero_bit
+
+/*
+ * Maximal mount counts between two filesystem checks
+ */
+#define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
+#define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
+
+/*
+ * Behaviour when detecting errors
+ */
+#define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
+#define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
+#define EXT3_ERRORS_PANIC               3       /* Panic */
+#define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
+
+/*
+ * Structure of the super block
+ */
+struct ext3_super_block {
+/*00*/  __le32  s_inodes_count;         /* Inodes count */
+        __le32  s_blocks_count;         /* Blocks count */
+        __le32  s_r_blocks_count;       /* Reserved blocks count */
+        __le32  s_free_blocks_count;    /* Free blocks count */
+/*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
+        __le32  s_first_data_block;     /* First Data Block */
+        __le32  s_log_block_size;       /* Block size */
+        __le32  s_log_frag_size;        /* Fragment size */
+/*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
+        __le32  s_frags_per_group;      /* # Fragments per group */
+        __le32  s_inodes_per_group;     /* # Inodes per group */
+        __le32  s_mtime;                /* Mount time */
+/*30*/  __le32  s_wtime;                /* Write time */
+        __le16  s_mnt_count;            /* Mount count */
+        __le16  s_max_mnt_count;        /* Maximal mount count */
+        __le16  s_magic;                /* Magic signature */
+        __le16  s_state;                /* File system state */
+        __le16  s_errors;               /* Behaviour when detecting errors */
+        __le16  s_minor_rev_level;      /* minor revision level */
+/*40*/  __le32  s_lastcheck;            /* time of last check */
+        __le32  s_checkinterval;        /* max. time between checks */
+        __le32  s_creator_os;           /* OS */
+        __le32  s_rev_level;            /* Revision level */
+/*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
+        __le16  s_def_resgid;           /* Default gid for reserved blocks */
+        /*
+         * These fields are for EXT3_DYNAMIC_REV superblocks only.
+         *
+         * Note: the difference between the compatible feature set and
+         * the incompatible feature set is that if there is a bit set
+         * in the incompatible feature set that the kernel doesn't
+         * know about, it should refuse to mount the filesystem.
+         *
+         * e2fsck's requirements are more strict; if it doesn't know
+         * about a feature in either the compatible or incompatible
+         * feature set, it must abort and not try to meddle with
+         * things it doesn't understand...
+         */
+        __le32  s_first_ino;            /* First non-reserved inode */
+        __le16   s_inode_size;          /* size of inode structure */
+        __le16  s_block_group_nr;       /* block group # of this superblock */
+        __le32  s_feature_compat;       /* compatible feature set */
+/*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
+        __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
+/*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
+/*78*/  char    s_volume_name[16];      /* volume name */
+/*88*/  char    s_last_mounted[64];     /* directory where last mounted */
+/*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
+        /*
+         * Performance hints.  Directory preallocation should only
+         * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
+         */
+        __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
+        __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
+        __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
+        /*
+         * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
+         */
+/*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
+/*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
+        __le32  s_journal_dev;          /* device number of journal file */
+        __le32  s_last_orphan;          /* start of list of inodes to delete */
+        __le32  s_hash_seed[4];         /* HTREE hash seed */
+        __u8    s_def_hash_version;     /* Default hash version to use */
+        __u8    s_reserved_char_pad;
+        __u16   s_reserved_word_pad;
+        __le32  s_default_mount_opts;
+        __le32  s_first_meta_bg;        /* First metablock block group */
+        __u32   s_reserved[190];        /* Padding to the end of the block */
+};
+
+#ifdef __KERNEL__
+#include <linux/ext3_fs_i.h>
+#include <linux/ext3_fs_sb.h>
+static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
+{
+        return sb->s_fs_info;
+}
+static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
+{
+        return container_of(inode, struct ext3_inode_info, vfs_inode);
+}
+
+static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
+{
+        return ino == EXT3_ROOT_INO ||
+                ino == EXT3_JOURNAL_INO ||
+                ino == EXT3_RESIZE_INO ||
+                (ino >= EXT3_FIRST_INO(sb) &&
+                 ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
+}
+#else
+/* Assume that user mode programs are passing in an ext3fs superblock, not
+ * a kernel struct super_block.  This will allow us to call the feature-test
+ * macros from user land. */
+#define EXT3_SB(sb)     (sb)
+#endif
+
+#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
+
+/*
+ * Codes for operating systems
+ */
+#define EXT3_OS_LINUX           0
+#define EXT3_OS_HURD            1
+#define EXT3_OS_MASIX           2
+#define EXT3_OS_FREEBSD         3
+#define EXT3_OS_LITES           4
+
+/*
+ * Revision levels
+ */
+#define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
+#define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
+
+#define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
+#define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
+
+#define EXT3_GOOD_OLD_INODE_SIZE 128
+
+/*
+ * Feature set definitions
+ */
+
+#define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
+        ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
+#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
+        ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
+#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
+        ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
+#define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
+        EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
+#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
+        EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
+#define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
+        EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
+#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
+        EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
+#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
+        EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
+#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
+        EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
+
+#define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
+#define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
+#define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
+#define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
+#define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
+#define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
+
+#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
+#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
+#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
+
+#define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
+#define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
+#define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
+#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
+#define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
+
+#define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
+#define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
+                                         EXT3_FEATURE_INCOMPAT_RECOVER| \
+                                         EXT3_FEATURE_INCOMPAT_META_BG)
+#define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
+                                         EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
+                                         EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
+
+/*
+ * Default values for user and/or group using reserved blocks
+ */
+#define EXT3_DEF_RESUID         0
+#define EXT3_DEF_RESGID         0
+
+/*
+ * Default mount options
+ */
+#define EXT3_DEFM_DEBUG         0x0001
+#define EXT3_DEFM_BSDGROUPS     0x0002
+#define EXT3_DEFM_XATTR_USER    0x0004
+#define EXT3_DEFM_ACL           0x0008
+#define EXT3_DEFM_UID16         0x0010
+#define EXT3_DEFM_JMODE         0x0060
+#define EXT3_DEFM_JMODE_DATA    0x0020
+#define EXT3_DEFM_JMODE_ORDERED 0x0040
+#define EXT3_DEFM_JMODE_WBACK   0x0060
+
+/*
+ * Structure of a directory entry
+ */
+#define EXT3_NAME_LEN 255
+
+struct ext3_dir_entry {
+        __le32  inode;                  /* Inode number */
+        __le16  rec_len;                /* Directory entry length */
+        __le16  name_len;               /* Name length */
+        char    name[EXT3_NAME_LEN];    /* File name */
+};
+
+/*
+ * The new version of the directory entry.  Since EXT3 structures are
+ * stored in intel byte order, and the name_len field could never be
+ * bigger than 255 chars, it's safe to reclaim the extra byte for the
+ * file_type field.
+ */
+struct ext3_dir_entry_2 {
+        __le32  inode;                  /* Inode number */
+        __le16  rec_len;                /* Directory entry length */
+        __u8    name_len;               /* Name length */
+        __u8    file_type;
+        char    name[EXT3_NAME_LEN];    /* File name */
+};
+
+/*
+ * Ext3 directory file types.  Only the low 3 bits are used.  The
+ * other bits are reserved for now.
+ */
+#define EXT3_FT_UNKNOWN         0
+#define EXT3_FT_REG_FILE        1
+#define EXT3_FT_DIR             2
+#define EXT3_FT_CHRDEV          3
+#define EXT3_FT_BLKDEV          4
+#define EXT3_FT_FIFO            5
+#define EXT3_FT_SOCK            6
+#define EXT3_FT_SYMLINK         7
+
+#define EXT3_FT_MAX             8
+
+/*
+ * EXT3_DIR_PAD defines the directory entries boundaries
+ *
+ * NOTE: It must be a multiple of 4
+ */
+#define EXT3_DIR_PAD                    4
+#define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
+#define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
+                                         ~EXT3_DIR_ROUND)
+/*
+ * Hash Tree Directory indexing
+ * (c) Daniel Phillips, 2001
+ */
+
+#ifdef CONFIG_EXT3_INDEX
+  #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
+                                              EXT3_FEATURE_COMPAT_DIR_INDEX) && \
+                      (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
+#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
+#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
+#else
+  #define is_dx(dir) 0
+#define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
+#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
+#endif
+
+/* Legal values for the dx_root hash_version field: */
+
+#define DX_HASH_LEGACY          0
+#define DX_HASH_HALF_MD4        1
+#define DX_HASH_TEA             2
+
+#ifdef __KERNEL__
+
+/* hash info structure used by the directory hash */
+struct dx_hash_info
+{
+        u32             hash;
+        u32             minor_hash;
+        int             hash_version;
+        u32             *seed;
+};
+
+#define EXT3_HTREE_EOF  0x7fffffff
+
+/*
+ * Control parameters used by ext3_htree_next_block
+ */
+#define HASH_NB_ALWAYS          1
+
+
+/*
+ * Describe an inode's exact location on disk and in memory
+ */
+struct ext3_iloc
+{
+        struct buffer_head *bh;
+        unsigned long offset;
+        unsigned long block_group;
+};
+
+static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
+{
+        return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
+}
+
+/*
+ * This structure is stuffed into the struct file's private_data field
+ * for directories.  It is where we put information so that we can do
+ * readdir operations in hash tree order.
+ */
+struct dir_private_info {
+        struct rb_root  root;
+        struct rb_node  *curr_node;
+        struct fname    *extra_fname;
+        loff_t          last_pos;
+        __u32           curr_hash;
+        __u32           curr_minor_hash;
+        __u32           next_hash;
+};
+
+/* calculate the first block number of the group */
+static inline ext3_fsblk_t
+ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
+{
+        return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
+                le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
+}
+
+/*
+ * Special error return code only used by dx_probe() and its callers.
+ */
+#define ERR_BAD_DX_DIR  -75000
+
+/*
+ * Function prototypes
+ */
+
+/*
+ * Ok, these declarations are also in <linux/kernel.h> but none of the
+ * ext3 source programs needs to include it so they are duplicated here.
+ */
+# define NORET_TYPE    /**/
+# define ATTRIB_NORET  __attribute__((noreturn))
+# define NORET_AND     noreturn,
+
+/* balloc.c */
+extern int ext3_bg_has_super(struct super_block *sb, int group);
+extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
+extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
+                        ext3_fsblk_t goal, int *errp);
+extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
+                        ext3_fsblk_t goal, unsigned long *count, int *errp);
+extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
+                        ext3_fsblk_t block, unsigned long count);
+extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
+                                 ext3_fsblk_t block, unsigned long count,
+                                unsigned long *pdquot_freed_blocks);
+extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
+extern void ext3_check_blocks_bitmap (struct super_block *);
+extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
+                                                    unsigned int block_group,
+                                                    struct buffer_head ** bh);
+extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
+extern void ext3_init_block_alloc_info(struct inode *);
+extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
+
+/* dir.c */
+extern int ext3_check_dir_entry(const char *, struct inode *,
+                                struct ext3_dir_entry_2 *,
+                                struct buffer_head *, unsigned long);
+extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
+                                    __u32 minor_hash,
+                                    struct ext3_dir_entry_2 *dirent);
+extern void ext3_htree_free_dir_info(struct dir_private_info *p);
+
+/* fsync.c */
+extern int ext3_sync_file (struct file *, struct dentry *, int);
+
+/* hash.c */
+extern int ext3fs_dirhash(const char *name, int len, struct
+                          dx_hash_info *hinfo);
+
+/* ialloc.c */
+extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
+extern void ext3_free_inode (handle_t *, struct inode *);
+extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
+extern unsigned long ext3_count_free_inodes (struct super_block *);
+extern unsigned long ext3_count_dirs (struct super_block *);
+extern void ext3_check_inodes_bitmap (struct super_block *);
+extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
+
+
+/* inode.c */
+int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
+                struct buffer_head *bh, ext3_fsblk_t blocknr);
+struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
+struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
+int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
+        sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
+        int create, int extend_disksize);
+
+extern void ext3_read_inode (struct inode *);
+extern int  ext3_write_inode (struct inode *, int);
+extern int  ext3_setattr (struct dentry *, struct iattr *);
+extern void ext3_delete_inode (struct inode *);
+extern int  ext3_sync_inode (handle_t *, struct inode *);
+extern void ext3_discard_reservation (struct inode *);
+extern void ext3_dirty_inode(struct inode *);
+extern int ext3_change_inode_journal_flag(struct inode *, int);
+extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
+extern void ext3_truncate (struct inode *);
+extern void ext3_set_inode_flags(struct inode *);
+extern void ext3_set_aops(struct inode *inode);
+
+/* ioctl.c */
+extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
+                       unsigned long);
+extern long ext3_compat_ioctl (struct file *, unsigned int, unsigned long);
+
+/* namei.c */
+extern int ext3_orphan_add(handle_t *, struct inode *);
+extern int ext3_orphan_del(handle_t *, struct inode *);
+extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
+                                __u32 start_minor_hash, __u32 *next_hash);
+
+/* resize.c */
+extern int ext3_group_add(struct super_block *sb,
+                                struct ext3_new_group_data *input);
+extern int ext3_group_extend(struct super_block *sb,
+                                struct ext3_super_block *es,
+                                ext3_fsblk_t n_blocks_count);
+
+/* super.c */
+extern void ext3_error (struct super_block *, const char *, const char *, ...)
+        __attribute__ ((format (printf, 3, 4)));
+extern void __ext3_std_error (struct super_block *, const char *, int);
+extern void ext3_abort (struct super_block *, const char *, const char *, ...)
+        __attribute__ ((format (printf, 3, 4)));
+extern void ext3_warning (struct super_block *, const char *, const char *, ...)
+        __attribute__ ((format (printf, 3, 4)));
+extern void ext3_update_dynamic_rev (struct super_block *sb);
+
+#define ext3_std_error(sb, errno)                               \
+do {                                                            \
+        if ((errno))                                            \
+                __ext3_std_error((sb), __FUNCTION__, (errno));  \
+} while (0)
+
+/*
+ * Inodes and files operations
+ */
+
+/* dir.c */
+extern const struct file_operations ext3_dir_operations;
+
+/* file.c */
+extern struct inode_operations ext3_file_inode_operations;
+extern const struct file_operations ext3_file_operations;
+
+/* namei.c */
+extern struct inode_operations ext3_dir_inode_operations;
+extern struct inode_operations ext3_special_inode_operations;
+
+/* symlink.c */
+extern struct inode_operations ext3_symlink_inode_operations;
+extern struct inode_operations ext3_fast_symlink_inode_operations;
+
+
+#endif  /* __KERNEL__ */
+
+#endif  /* _LINUX_EXT3_FS_H */
diff --git a/include/linux/ext4_fs_i.h b/include/linux/ext4_fs_i.h
new file mode 100644
index 000000000000..4395e5206746
--- /dev/null
+++ b/include/linux/ext4_fs_i.h
@@ -0,0 +1,147 @@
+/*
+ *  linux/include/linux/ext3_fs_i.h
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  from
+ *
+ *  linux/include/linux/minix_fs_i.h
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#ifndef _LINUX_EXT3_FS_I
+#define _LINUX_EXT3_FS_I
+
+#include <linux/rwsem.h>
+#include <linux/rbtree.h>
+#include <linux/seqlock.h>
+#include <linux/mutex.h>
+
+/* data type for block offset of block group */
+typedef int ext3_grpblk_t;
+
+/* data type for filesystem-wide blocks number */
+typedef unsigned long ext3_fsblk_t;
+
+#define E3FSBLK "%lu"
+
+struct ext3_reserve_window {
+        ext3_fsblk_t    _rsv_start;     /* First byte reserved */
+        ext3_fsblk_t    _rsv_end;       /* Last byte reserved or 0 */
+};
+
+struct ext3_reserve_window_node {
+        struct rb_node          rsv_node;
+        __u32                   rsv_goal_size;
+        __u32                   rsv_alloc_hit;
+        struct ext3_reserve_window      rsv_window;
+};
+
+struct ext3_block_alloc_info {
+        /* information about reservation window */
+        struct ext3_reserve_window_node rsv_window_node;
+        /*
+         * was i_next_alloc_block in ext3_inode_info
+         * is the logical (file-relative) number of the
+         * most-recently-allocated block in this file.
+         * We use this for detecting linearly ascending allocation requests.
+         */
+        __u32                   last_alloc_logical_block;
+        /*
+         * Was i_next_alloc_goal in ext3_inode_info
+         * is the *physical* companion to i_next_alloc_block.
+         * it the the physical block number of the block which was most-recentl
+         * allocated to this file.  This give us the goal (target) for the next
+         * allocation when we detect linearly ascending requests.
+         */
+        ext3_fsblk_t            last_alloc_physical_block;
+};
+
+#define rsv_start rsv_window._rsv_start
+#define rsv_end rsv_window._rsv_end
+
+/*
+ * third extended file system inode data in memory
+ */
+struct ext3_inode_info {
+        __le32  i_data[15];     /* unconverted */
+        __u32   i_flags;
+#ifdef EXT3_FRAGMENTS
+        __u32   i_faddr;
+        __u8    i_frag_no;
+        __u8    i_frag_size;
+#endif
+        ext3_fsblk_t    i_file_acl;
+        __u32   i_dir_acl;
+        __u32   i_dtime;
+
+        /*
+         * i_block_group is the number of the block group which contains
+         * this file's inode.  Constant across the lifetime of the inode,
+         * it is ued for making block allocation decisions - we try to
+         * place a file's data blocks near its inode block, and new inodes
+         * near to their parent directory's inode.
+         */
+        __u32   i_block_group;
+        __u32   i_state;                /* Dynamic state flags for ext3 */
+
+        /* block reservation info */
+        struct ext3_block_alloc_info *i_block_alloc_info;
+
+        __u32   i_dir_start_lookup;
+#ifdef CONFIG_EXT3_FS_XATTR
+        /*
+         * Extended attributes can be read independently of the main file
+         * data. Taking i_mutex even when reading would cause contention
+         * between readers of EAs and writers of regular file data, so
+         * instead we synchronize on xattr_sem when reading or changing
+         * EAs.
+         */
+        struct rw_semaphore xattr_sem;
+#endif
+#ifdef CONFIG_EXT3_FS_POSIX_ACL
+        struct posix_acl        *i_acl;
+        struct posix_acl        *i_default_acl;
+#endif
+
+        struct list_head i_orphan;      /* unlinked but open inodes */
+
+        /*
+         * i_disksize keeps track of what the inode size is ON DISK, not
+         * in memory.  During truncate, i_size is set to the new size by
+         * the VFS prior to calling ext3_truncate(), but the filesystem won't
+         * set i_disksize to 0 until the truncate is actually under way.
+         *
+         * The intent is that i_disksize always represents the blocks which
+         * are used by this file.  This allows recovery to restart truncate
+         * on orphans if we crash during truncate.  We actually write i_disksize
+         * into the on-disk inode when writing inodes out, instead of i_size.
+         *
+         * The only time when i_disksize and i_size may be different is when
+         * a truncate is in progress.  The only things which change i_disksize
+         * are ext3_get_block (growth) and ext3_truncate (shrinkth).
+         */
+        loff_t  i_disksize;
+
+        /* on-disk additional length */
+        __u16 i_extra_isize;
+
+        /*
+         * truncate_mutex is for serialising ext3_truncate() against
+         * ext3_getblock().  In the 2.4 ext2 design, great chunks of inode's
+         * data tree are chopped off during truncate. We can't do that in
+         * ext3 because whenever we perform intermediate commits during
+         * truncate, the inode and all the metadata blocks *must* be in a
+         * consistent state which allows truncation of the orphans to restart
+         * during recovery.  Hence we must fix the get_block-vs-truncate race
+         * by other means, so we have truncate_mutex.
+         */
+        struct mutex truncate_mutex;
+        struct inode vfs_inode;
+};
+
+#endif  /* _LINUX_EXT3_FS_I */
diff --git a/include/linux/ext4_fs_sb.h b/include/linux/ext4_fs_sb.h
new file mode 100644
index 000000000000..f61309c81cc4
--- /dev/null
+++ b/include/linux/ext4_fs_sb.h
@@ -0,0 +1,83 @@
+/*
+ *  linux/include/linux/ext3_fs_sb.h
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  from
+ *
+ *  linux/include/linux/minix_fs_sb.h
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#ifndef _LINUX_EXT3_FS_SB
+#define _LINUX_EXT3_FS_SB
+
+#ifdef __KERNEL__
+#include <linux/timer.h>
+#include <linux/wait.h>
+#include <linux/blockgroup_lock.h>
+#include <linux/percpu_counter.h>
+#endif
+#include <linux/rbtree.h>
+
+/*
+ * third extended-fs super-block data in memory
+ */
+struct ext3_sb_info {
+        unsigned long s_frag_size;      /* Size of a fragment in bytes */
+        unsigned long s_frags_per_block;/* Number of fragments per block */
+        unsigned long s_inodes_per_block;/* Number of inodes per block */
+        unsigned long s_frags_per_group;/* Number of fragments in a group */
+        unsigned long s_blocks_per_group;/* Number of blocks in a group */
+        unsigned long s_inodes_per_group;/* Number of inodes in a group */
+        unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
+        unsigned long s_gdb_count;      /* Number of group descriptor blocks */
+        unsigned long s_desc_per_block; /* Number of group descriptors per block */
+        unsigned long s_groups_count;   /* Number of groups in the fs */
+        struct buffer_head * s_sbh;     /* Buffer containing the super block */
+        struct ext3_super_block * s_es; /* Pointer to the super block in the buffer */
+        struct buffer_head ** s_group_desc;
+        unsigned long  s_mount_opt;
+        uid_t s_resuid;
+        gid_t s_resgid;
+        unsigned short s_mount_state;
+        unsigned short s_pad;
+        int s_addr_per_block_bits;
+        int s_desc_per_block_bits;
+        int s_inode_size;
+        int s_first_ino;
+        spinlock_t s_next_gen_lock;
+        u32 s_next_generation;
+        u32 s_hash_seed[4];
+        int s_def_hash_version;
+        struct percpu_counter s_freeblocks_counter;
+        struct percpu_counter s_freeinodes_counter;
+        struct percpu_counter s_dirs_counter;
+        struct blockgroup_lock s_blockgroup_lock;
+
+        /* root of the per fs reservation window tree */
+        spinlock_t s_rsv_window_lock;
+        struct rb_root s_rsv_window_root;
+        struct ext3_reserve_window_node s_rsv_window_head;
+
+        /* Journaling */
+        struct inode * s_journal_inode;
+        struct journal_s * s_journal;
+        struct list_head s_orphan;
+        unsigned long s_commit_interval;
+        struct block_device *journal_bdev;
+#ifdef CONFIG_JBD_DEBUG
+        struct timer_list turn_ro_timer;        /* For turning read-only (crash simulation) */
+        wait_queue_head_t ro_wait_queue;        /* For people waiting for the fs to go read-only */
+#endif
+#ifdef CONFIG_QUOTA
+        char *s_qf_names[MAXQUOTAS];            /* Names of quota files with journalled quota */
+        int s_jquota_fmt;                       /* Format of quota to use */
+#endif
+};
+
+#endif  /* _LINUX_EXT3_FS_SB */
diff --git a/include/linux/ext4_jbd.h b/include/linux/ext4_jbd.h
new file mode 100644
index 000000000000..ce0e6109aff0
--- /dev/null
+++ b/include/linux/ext4_jbd.h
@@ -0,0 +1,268 @@
+/*
+ * linux/include/linux/ext3_jbd.h
+ *
+ * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
+ *
+ * Copyright 1998--1999 Red Hat corp --- All Rights Reserved
+ *
+ * This file is part of the Linux kernel and is made available under
+ * the terms of the GNU General Public License, version 2, or at your
+ * option, any later version, incorporated herein by reference.
+ *
+ * Ext3-specific journaling extensions.
+ */
+
+#ifndef _LINUX_EXT3_JBD_H
+#define _LINUX_EXT3_JBD_H
+
+#include <linux/fs.h>
+#include <linux/jbd.h>
+#include <linux/ext3_fs.h>
+
+#define EXT3_JOURNAL(inode)     (EXT3_SB((inode)->i_sb)->s_journal)
+
+/* Define the number of blocks we need to account to a transaction to
+ * modify one block of data.
+ *
+ * We may have to touch one inode, one bitmap buffer, up to three
+ * indirection blocks, the group and superblock summaries, and the data
+ * block to complete the transaction.  */
+
+#define EXT3_SINGLEDATA_TRANS_BLOCKS    8U
+
+/* Extended attribute operations touch at most two data buffers,
+ * two bitmap buffers, and two group summaries, in addition to the inode
+ * and the superblock, which are already accounted for. */
+
+#define EXT3_XATTR_TRANS_BLOCKS         6U
+
+/* Define the minimum size for a transaction which modifies data.  This
+ * needs to take into account the fact that we may end up modifying two
+ * quota files too (one for the group, one for the user quota).  The
+ * superblock only gets updated once, of course, so don't bother
+ * counting that again for the quota updates. */
+
+#define EXT3_DATA_TRANS_BLOCKS(sb)      (EXT3_SINGLEDATA_TRANS_BLOCKS + \
+                                         EXT3_XATTR_TRANS_BLOCKS - 2 + \
+                                         2*EXT3_QUOTA_TRANS_BLOCKS(sb))
+
+/* Delete operations potentially hit one directory's namespace plus an
+ * entire inode, plus arbitrary amounts of bitmap/indirection data.  Be
+ * generous.  We can grow the delete transaction later if necessary. */
+
+#define EXT3_DELETE_TRANS_BLOCKS(sb)    (2 * EXT3_DATA_TRANS_BLOCKS(sb) + 64)
+
+/* Define an arbitrary limit for the amount of data we will anticipate
+ * writing to any given transaction.  For unbounded transactions such as
+ * write(2) and truncate(2) we can write more than this, but we always
+ * start off at the maximum transaction size and grow the transaction
+ * optimistically as we go. */
+
+#define EXT3_MAX_TRANS_DATA             64U
+
+/* We break up a large truncate or write transaction once the handle's
+ * buffer credits gets this low, we need either to extend the
+ * transaction or to start a new one.  Reserve enough space here for
+ * inode, bitmap, superblock, group and indirection updates for at least
+ * one block, plus two quota updates.  Quota allocations are not
+ * needed. */
+
+#define EXT3_RESERVE_TRANS_BLOCKS       12U
+
+#define EXT3_INDEX_EXTRA_TRANS_BLOCKS   8
+
+#ifdef CONFIG_QUOTA
+/* Amount of blocks needed for quota update - we know that the structure was
+ * allocated so we need to update only inode+data */
+#define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
+/* Amount of blocks needed for quota insert/delete - we do some block writes
+ * but inode, sb and group updates are done only once */
+#define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
+                (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
+#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
+                (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
+#else
+#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
+#define EXT3_QUOTA_INIT_BLOCKS(sb) 0
+#define EXT3_QUOTA_DEL_BLOCKS(sb) 0
+#endif
+
+int
+ext3_mark_iloc_dirty(handle_t *handle,
+                     struct inode *inode,
+                     struct ext3_iloc *iloc);
+
+/*
+ * On success, We end up with an outstanding reference count against
+ * iloc->bh.  This _must_ be cleaned up later.
+ */
+
+int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
+                        struct ext3_iloc *iloc);
+
+int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
+
+/*
+ * Wrapper functions with which ext3 calls into JBD.  The intent here is
+ * to allow these to be turned into appropriate stubs so ext3 can control
+ * ext2 filesystems, so ext2+ext3 systems only nee one fs.  This work hasn't
+ * been done yet.
+ */
+
+void ext3_journal_abort_handle(const char *caller, const char *err_fn,
+                struct buffer_head *bh, handle_t *handle, int err);
+
+static inline int
+__ext3_journal_get_undo_access(const char *where, handle_t *handle,
+                                struct buffer_head *bh)
+{
+        int err = journal_get_undo_access(handle, bh);
+        if (err)
+                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
+        return err;
+}
+
+static inline int
+__ext3_journal_get_write_access(const char *where, handle_t *handle,
+                                struct buffer_head *bh)
+{
+        int err = journal_get_write_access(handle, bh);
+        if (err)
+                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
+        return err;
+}
+
+static inline void
+ext3_journal_release_buffer(handle_t *handle, struct buffer_head *bh)
+{
+        journal_release_buffer(handle, bh);
+}
+
+static inline int
+__ext3_journal_forget(const char *where, handle_t *handle, struct buffer_head *bh)
+{
+        int err = journal_forget(handle, bh);
+        if (err)
+                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
+        return err;
+}
+
+static inline int
+__ext3_journal_revoke(const char *where, handle_t *handle,
+                      unsigned long blocknr, struct buffer_head *bh)
+{
+        int err = journal_revoke(handle, blocknr, bh);
+        if (err)
+                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
+        return err;
+}
+
+static inline int
+__ext3_journal_get_create_access(const char *where,
+                                 handle_t *handle, struct buffer_head *bh)
+{
+        int err = journal_get_create_access(handle, bh);
+        if (err)
+                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
+        return err;
+}
+
+static inline int
+__ext3_journal_dirty_metadata(const char *where,
+                              handle_t *handle, struct buffer_head *bh)
+{
+        int err = journal_dirty_metadata(handle, bh);
+        if (err)
+                ext3_journal_abort_handle(where, __FUNCTION__, bh, handle,err);
+        return err;
+}
+
+
+#define ext3_journal_get_undo_access(handle, bh) \
+        __ext3_journal_get_undo_access(__FUNCTION__, (handle), (bh))
+#define ext3_journal_get_write_access(handle, bh) \
+        __ext3_journal_get_write_access(__FUNCTION__, (handle), (bh))
+#define ext3_journal_revoke(handle, blocknr, bh) \
+        __ext3_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
+#define ext3_journal_get_create_access(handle, bh) \
+        __ext3_journal_get_create_access(__FUNCTION__, (handle), (bh))
+#define ext3_journal_dirty_metadata(handle, bh) \
+        __ext3_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
+#define ext3_journal_forget(handle, bh) \
+        __ext3_journal_forget(__FUNCTION__, (handle), (bh))
+
+int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
+
+handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
+int __ext3_journal_stop(const char *where, handle_t *handle);
+
+static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
+{
+        return ext3_journal_start_sb(inode->i_sb, nblocks);
+}
+
+#define ext3_journal_stop(handle) \
+        __ext3_journal_stop(__FUNCTION__, (handle))
+
+static inline handle_t *ext3_journal_current_handle(void)
+{
+        return journal_current_handle();
+}
+
+static inline int ext3_journal_extend(handle_t *handle, int nblocks)
+{
+        return journal_extend(handle, nblocks);
+}
+
+static inline int ext3_journal_restart(handle_t *handle, int nblocks)
+{
+        return journal_restart(handle, nblocks);
+}
+
+static inline int ext3_journal_blocks_per_page(struct inode *inode)
+{
+        return journal_blocks_per_page(inode);
+}
+
+static inline int ext3_journal_force_commit(journal_t *journal)
+{
+        return journal_force_commit(journal);
+}
+
+/* super.c */
+int ext3_force_commit(struct super_block *sb);
+
+static inline int ext3_should_journal_data(struct inode *inode)
+{
+        if (!S_ISREG(inode->i_mode))
+                return 1;
+        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
+                return 1;
+        if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
+                return 1;
+        return 0;
+}
+
+static inline int ext3_should_order_data(struct inode *inode)
+{
+        if (!S_ISREG(inode->i_mode))
+                return 0;
+        if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
+                return 0;
+        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
+                return 1;
+        return 0;
+}
+
+static inline int ext3_should_writeback_data(struct inode *inode)
+{
+        if (!S_ISREG(inode->i_mode))
+                return 0;
+        if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
+                return 0;
+        if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
+                return 1;
+        return 0;
+}
+
+#endif  /* _LINUX_EXT3_JBD_H */