19 files changed, 755 insertions, 265 deletions

diff --git a/fs/Makefile b/fs/Makefile
index 2168c902d5c..d9f8afe6f0c 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -81,8 +81,6 @@ obj-$(CONFIG_HUGETLBFS)		+= hugetlbfs/
 obj-$(CONFIG_CODA_FS)           += coda/
 obj-$(CONFIG_MINIX_FS)          += minix/
 obj-$(CONFIG_FAT_FS)            += fat/
-obj-$(CONFIG_MSDOS_FS)          += msdos/
-obj-$(CONFIG_VFAT_FS)           += vfat/
 obj-$(CONFIG_BFS_FS)            += bfs/
 obj-$(CONFIG_ISO9660_FS)        += isofs/
 obj-$(CONFIG_HFSPLUS_FS)        += hfsplus/ # Before hfs to find wrapped HFS+
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 625abf5422e..33bf8cbfd05 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -128,9 +128,10 @@ static inline void free_dev_ioctl(struct autofs_dev_ioctl *param)
  */
 static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param)
 {
-        int err = -EINVAL;
+        int err;
 
-        if (check_dev_ioctl_version(cmd, param)) {
+        err = check_dev_ioctl_version(cmd, param);
+        if (err) {
                 AUTOFS_WARN("invalid device control module version "
                      "supplied for cmd(0x%08x)", cmd);
                 goto out;
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index cde2f8e8935..4b6fb3f628c 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -56,12 +56,23 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
         mntget(mnt);
         dget(dentry);
 
-        if (!autofs4_follow_mount(&mnt, &dentry))
+        if (!follow_down(&mnt, &dentry))
                 goto done;
 
-        /* This is an autofs submount, we can't expire it */
-        if (is_autofs4_dentry(dentry))
-                goto done;
+        if (is_autofs4_dentry(dentry)) {
+                struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+
+                /* This is an autofs submount, we can't expire it */
+                if (sbi->type == AUTOFS_TYPE_INDIRECT)
+                        goto done;
+
+                /*
+                 * Otherwise it's an offset mount and we need to check
+                 * if we can umount its mount, if there is one.
+                 */
+                if (!d_mountpoint(dentry))
+                        goto done;
+        }
 
         /* Update the expiry counter if fs is busy */
         if (!may_umount_tree(mnt)) {
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index e5717a4fae6..5dec6d1356c 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -2390,13 +2390,12 @@ static void ext3_write_super (struct super_block * sb)
 
 static int ext3_sync_fs(struct super_block *sb, int wait)
 {
-        tid_t target;
-
         sb->s_dirt = 0;
-        if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
-                if (wait)
-                        log_wait_commit(EXT3_SB(sb)->s_journal, target);
-        }
+        if (wait)
+                ext3_force_commit(sb);
+        else
+                journal_start_commit(EXT3_SB(sb)->s_journal, NULL);
+
         return 0;
 }
 
diff --git a/fs/fat/Makefile b/fs/fat/Makefile
index bfb5f06cf2c..e06190322c1 100644
--- a/fs/fat/Makefile
+++ b/fs/fat/Makefile
@@ -3,5 +3,9 @@
 #
 
 obj-$(CONFIG_FAT_FS) += fat.o
+obj-$(CONFIG_VFAT_FS) += vfat.o
+obj-$(CONFIG_MSDOS_FS) += msdos.o
 
-fat-objs := cache.o dir.o fatent.o file.o inode.o misc.o
+fat-y := cache.o dir.o fatent.o file.o inode.o misc.o
+vfat-y := namei_vfat.o
+msdos-y := namei_msdos.o
diff --git a/fs/fat/cache.c b/fs/fat/cache.c
index 3222f51c41c..b4260229808 100644
--- a/fs/fat/cache.c
+++ b/fs/fat/cache.c
@@ -9,8 +9,8 @@
  */
 
 #include <linux/fs.h>
-#include <linux/msdos_fs.h>
 #include <linux/buffer_head.h>
+#include "fat.h"
 
 /* this must be > 0. */
 #define FAT_MAX_CACHE   8
@@ -293,10 +293,12 @@ static int fat_bmap_cluster(struct inode *inode, int cluster)
 }
 
 int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
-             unsigned long *mapped_blocks)
+             unsigned long *mapped_blocks, int create)
 {
         struct super_block *sb = inode->i_sb;
         struct msdos_sb_info *sbi = MSDOS_SB(sb);
+        const unsigned long blocksize = sb->s_blocksize;
+        const unsigned char blocksize_bits = sb->s_blocksize_bits;
         sector_t last_block;
         int cluster, offset;
 
@@ -309,10 +311,21 @@ int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
                 }
                 return 0;
         }
-        last_block = (MSDOS_I(inode)->mmu_private + (sb->s_blocksize - 1))
-                >> sb->s_blocksize_bits;
-        if (sector >= last_block)
-                return 0;
+
+        last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits;
+        if (sector >= last_block) {
+                if (!create)
+                        return 0;
+
+                /*
+                 * ->mmu_private can access on only allocation path.
+                 * (caller must hold ->i_mutex)
+                 */
+                last_block = (MSDOS_I(inode)->mmu_private + (blocksize - 1))
+                        >> blocksize_bits;
+                if (sector >= last_block)
+                        return 0;
+        }
 
         cluster = sector >> (sbi->cluster_bits - sb->s_blocksize_bits);
         offset  = sector & (sbi->sec_per_clus - 1);
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index bae1c329252..67e05835709 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -16,11 +16,11 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/time.h>
-#include <linux/msdos_fs.h>
 #include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 #include <linux/compat.h>
 #include <asm/uaccess.h>
+#include "fat.h"
 
 static inline loff_t fat_make_i_pos(struct super_block *sb,
                                     struct buffer_head *bh,
@@ -77,7 +77,7 @@ next:
 
         *bh = NULL;
         iblock = *pos >> sb->s_blocksize_bits;
-        err = fat_bmap(dir, iblock, &phys, &mapped_blocks);
+        err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0);
         if (err || !phys)
                 return -1;      /* beyond EOF or error */
 
@@ -86,7 +86,7 @@ next:
         *bh = sb_bread(sb, phys);
         if (*bh == NULL) {
                 printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n",
-                       (unsigned long long)phys);
+                       (llu)phys);
                 /* skip this block */
                 *pos = (iblock + 1) << sb->s_blocksize_bits;
                 goto next;
@@ -373,9 +373,10 @@ parse_record:
                 if (de->attr == ATTR_EXT) {
                         int status = fat_parse_long(inode, &cpos, &bh, &de,
                                                     &unicode, &nr_slots);
-                        if (status < 0)
-                                return status;
-                        else if (status == PARSE_INVALID)
+                        if (status < 0) {
+                                err = status;
+                                goto end_of_dir;
+                        } else if (status == PARSE_INVALID)
                                 continue;
                         else if (status == PARSE_NOT_LONGNAME)
                                 goto parse_record;
@@ -832,6 +833,7 @@ static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
 #endif /* CONFIG_COMPAT */
 
 const struct file_operations fat_dir_operations = {
+        .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = fat_readdir,
         .ioctl          = fat_dir_ioctl,
@@ -1089,6 +1091,7 @@ int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
         struct msdos_dir_entry *de;
         sector_t blknr;
         __le16 date, time;
+        u8 time_cs;
         int err, cluster;
 
         err = fat_alloc_clusters(dir, &cluster, 1);
@@ -1102,7 +1105,7 @@ int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
                 goto error_free;
         }
 
-        fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
+        fat_time_unix2fat(sbi, ts, &time, &date, &time_cs);
 
         de = (struct msdos_dir_entry *)bhs[0]->b_data;
         /* filling the new directory slots ("." and ".." entries) */
@@ -1112,13 +1115,14 @@ int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
         de[0].lcase = de[1].lcase = 0;
         de[0].time = de[1].time = time;
         de[0].date = de[1].date = date;
-        de[0].ctime_cs = de[1].ctime_cs = 0;
         if (sbi->options.isvfat) {
                 /* extra timestamps */
                 de[0].ctime = de[1].ctime = time;
+                de[0].ctime_cs = de[1].ctime_cs = time_cs;
                 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date;
         } else {
                 de[0].ctime = de[1].ctime = 0;
+                de[0].ctime_cs = de[1].ctime_cs = 0;
                 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
         }
         de[0].start = cpu_to_le16(cluster);
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
new file mode 100644
index 00000000000..ea440d65819
--- /dev/null
+++ b/fs/fat/fat.h
@@ -0,0 +1,329 @@
+#ifndef _FAT_H
+#define _FAT_H
+
+#include <linux/buffer_head.h>
+#include <linux/string.h>
+#include <linux/nls.h>
+#include <linux/fs.h>
+#include <linux/mutex.h>
+#include <linux/msdos_fs.h>
+
+/*
+ * vfat shortname flags
+ */
+#define VFAT_SFN_DISPLAY_LOWER  0x0001 /* convert to lowercase for display */
+#define VFAT_SFN_DISPLAY_WIN95  0x0002 /* emulate win95 rule for display */
+#define VFAT_SFN_DISPLAY_WINNT  0x0004 /* emulate winnt rule for display */
+#define VFAT_SFN_CREATE_WIN95   0x0100 /* emulate win95 rule for create */
+#define VFAT_SFN_CREATE_WINNT   0x0200 /* emulate winnt rule for create */
+
+struct fat_mount_options {
+        uid_t fs_uid;
+        gid_t fs_gid;
+        unsigned short fs_fmask;
+        unsigned short fs_dmask;
+        unsigned short codepage;  /* Codepage for shortname conversions */
+        char *iocharset;          /* Charset used for filename input/display */
+        unsigned short shortname; /* flags for shortname display/create rule */
+        unsigned char name_check; /* r = relaxed, n = normal, s = strict */
+        unsigned short allow_utime;/* permission for setting the [am]time */
+        unsigned quiet:1,         /* set = fake successful chmods and chowns */
+                 showexec:1,      /* set = only set x bit for com/exe/bat */
+                 sys_immutable:1, /* set = system files are immutable */
+                 dotsOK:1,        /* set = hidden and system files are named '.filename' */
+                 isvfat:1,        /* 0=no vfat long filename support, 1=vfat support */
+                 utf8:1,          /* Use of UTF-8 character set (Default) */
+                 unicode_xlate:1, /* create escape sequences for unhandled Unicode */
+                 numtail:1,       /* Does first alias have a numeric '~1' type tail? */
+                 flush:1,         /* write things quickly */
+                 nocase:1,        /* Does this need case conversion? 0=need case conversion*/
+                 usefree:1,       /* Use free_clusters for FAT32 */
+                 tz_utc:1,        /* Filesystem timestamps are in UTC */
+                 rodir:1;         /* allow ATTR_RO for directory */
+};
+
+#define FAT_HASH_BITS   8
+#define FAT_HASH_SIZE   (1UL << FAT_HASH_BITS)
+
+/*
+ * MS-DOS file system in-core superblock data
+ */
+struct msdos_sb_info {
+        unsigned short sec_per_clus; /* sectors/cluster */
+        unsigned short cluster_bits; /* log2(cluster_size) */
+        unsigned int cluster_size;   /* cluster size */
+        unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
+        unsigned short fat_start;
+        unsigned long fat_length;    /* FAT start & length (sec.) */
+        unsigned long dir_start;
+        unsigned short dir_entries;  /* root dir start & entries */
+        unsigned long data_start;    /* first data sector */
+        unsigned long max_cluster;   /* maximum cluster number */
+        unsigned long root_cluster;  /* first cluster of the root directory */
+        unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
+        struct mutex fat_lock;
+        unsigned int prev_free;      /* previously allocated cluster number */
+        unsigned int free_clusters;  /* -1 if undefined */
+        unsigned int free_clus_valid; /* is free_clusters valid? */
+        struct fat_mount_options options;
+        struct nls_table *nls_disk;  /* Codepage used on disk */
+        struct nls_table *nls_io;    /* Charset used for input and display */
+        const void *dir_ops;                 /* Opaque; default directory operations */
+        int dir_per_block;           /* dir entries per block */
+        int dir_per_block_bits;      /* log2(dir_per_block) */
+
+        int fatent_shift;
+        struct fatent_operations *fatent_ops;
+
+        spinlock_t inode_hash_lock;
+        struct hlist_head inode_hashtable[FAT_HASH_SIZE];
+};
+
+#define FAT_CACHE_VALID 0       /* special case for valid cache */
+
+/*
+ * MS-DOS file system inode data in memory
+ */
+struct msdos_inode_info {
+        spinlock_t cache_lru_lock;
+        struct list_head cache_lru;
+        int nr_caches;
+        /* for avoiding the race between fat_free() and fat_get_cluster() */
+        unsigned int cache_valid_id;
+
+        /* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
+        loff_t mmu_private;     /* physically allocated size */
+
+        int i_start;            /* first cluster or 0 */
+        int i_logstart;         /* logical first cluster */
+        int i_attrs;            /* unused attribute bits */
+        loff_t i_pos;           /* on-disk position of directory entry or 0 */
+        struct hlist_node i_fat_hash;   /* hash by i_location */
+        struct inode vfs_inode;
+};
+
+struct fat_slot_info {
+        loff_t i_pos;           /* on-disk position of directory entry */
+        loff_t slot_off;        /* offset for slot or de start */
+        int nr_slots;           /* number of slots + 1(de) in filename */
+        struct msdos_dir_entry *de;
+        struct buffer_head *bh;
+};
+
+static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
+{
+        return sb->s_fs_info;
+}
+
+static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
+{
+        return container_of(inode, struct msdos_inode_info, vfs_inode);
+}
+
+/*
+ * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
+ * save ATTR_RO instead of ->i_mode.
+ *
+ * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
+ * bit, it's just used as flag for app.
+ */
+static inline int fat_mode_can_hold_ro(struct inode *inode)
+{
+        struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+        mode_t mask;
+
+        if (S_ISDIR(inode->i_mode)) {
+                if (!sbi->options.rodir)
+                        return 0;
+                mask = ~sbi->options.fs_dmask;
+        } else
+                mask = ~sbi->options.fs_fmask;
+
+        if (!(mask & S_IWUGO))
+                return 0;
+        return 1;
+}
+
+/* Convert attribute bits and a mask to the UNIX mode. */
+static inline mode_t fat_make_mode(struct msdos_sb_info *sbi,
+                                   u8 attrs, mode_t mode)
+{
+        if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir))
+                mode &= ~S_IWUGO;
+
+        if (attrs & ATTR_DIR)
+                return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
+        else
+                return (mode & ~sbi->options.fs_fmask) | S_IFREG;
+}
+
+/* Return the FAT attribute byte for this inode */
+static inline u8 fat_make_attrs(struct inode *inode)
+{
+        u8 attrs = MSDOS_I(inode)->i_attrs;
+        if (S_ISDIR(inode->i_mode))
+                attrs |= ATTR_DIR;
+        if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO))
+                attrs |= ATTR_RO;
+        return attrs;
+}
+
+static inline void fat_save_attrs(struct inode *inode, u8 attrs)
+{
+        if (fat_mode_can_hold_ro(inode))
+                MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED;
+        else
+                MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED | ATTR_RO);
+}
+
+static inline unsigned char fat_checksum(const __u8 *name)
+{
+        unsigned char s = name[0];
+        s = (s<<7) + (s>>1) + name[1];  s = (s<<7) + (s>>1) + name[2];
+        s = (s<<7) + (s>>1) + name[3];  s = (s<<7) + (s>>1) + name[4];
+        s = (s<<7) + (s>>1) + name[5];  s = (s<<7) + (s>>1) + name[6];
+        s = (s<<7) + (s>>1) + name[7];  s = (s<<7) + (s>>1) + name[8];
+        s = (s<<7) + (s>>1) + name[9];  s = (s<<7) + (s>>1) + name[10];
+        return s;
+}
+
+static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
+{
+        return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
+                + sbi->data_start;
+}
+
+static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
+{
+#ifdef __BIG_ENDIAN
+        while (len--) {
+                *dst++ = src[0] | (src[1] << 8);
+                src += 2;
+        }
+#else
+        memcpy(dst, src, len * 2);
+#endif
+}
+
+static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
+{
+#ifdef __BIG_ENDIAN
+        while (len--) {
+                dst[0] = *src & 0x00FF;
+                dst[1] = (*src & 0xFF00) >> 8;
+                dst += 2;
+                src++;
+        }
+#else
+        memcpy(dst, src, len * 2);
+#endif
+}
+
+/* fat/cache.c */
+extern void fat_cache_inval_inode(struct inode *inode);
+extern int fat_get_cluster(struct inode *inode, int cluster,
+                           int *fclus, int *dclus);
+extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
+                    unsigned long *mapped_blocks, int create);
+
+/* fat/dir.c */
+extern const struct file_operations fat_dir_operations;
+extern int fat_search_long(struct inode *inode, const unsigned char *name,
+                           int name_len, struct fat_slot_info *sinfo);
+extern int fat_dir_empty(struct inode *dir);
+extern int fat_subdirs(struct inode *dir);
+extern int fat_scan(struct inode *dir, const unsigned char *name,
+                    struct fat_slot_info *sinfo);
+extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
+                                struct msdos_dir_entry **de, loff_t *i_pos);
+extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
+extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
+                           struct fat_slot_info *sinfo);
+extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);
+
+/* fat/fatent.c */
+struct fat_entry {
+        int entry;
+        union {
+                u8 *ent12_p[2];
+                __le16 *ent16_p;
+                __le32 *ent32_p;
+        } u;
+        int nr_bhs;
+        struct buffer_head *bhs[2];
+};
+
+static inline void fatent_init(struct fat_entry *fatent)
+{
+        fatent->nr_bhs = 0;
+        fatent->entry = 0;
+        fatent->u.ent32_p = NULL;
+        fatent->bhs[0] = fatent->bhs[1] = NULL;
+}
+
+static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
+{
+        fatent->entry = entry;
+        fatent->u.ent32_p = NULL;
+}
+
+static inline void fatent_brelse(struct fat_entry *fatent)
+{
+        int i;
+        fatent->u.ent32_p = NULL;
+        for (i = 0; i < fatent->nr_bhs; i++)
+                brelse(fatent->bhs[i]);
+        fatent->nr_bhs = 0;
+        fatent->bhs[0] = fatent->bhs[1] = NULL;
+}
+
+extern void fat_ent_access_init(struct super_block *sb);
+extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
+                        int entry);
+extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
+                         int new, int wait);
+extern int fat_alloc_clusters(struct inode *inode, int *cluster,
+                              int nr_cluster);
+extern int fat_free_clusters(struct inode *inode, int cluster);
+extern int fat_count_free_clusters(struct super_block *sb);
+
+/* fat/file.c */
+extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
+                             unsigned int cmd, unsigned long arg);
+extern const struct file_operations fat_file_operations;
+extern const struct inode_operations fat_file_inode_operations;
+extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
+extern void fat_truncate(struct inode *inode);
+extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
+                       struct kstat *stat);
+
+/* fat/inode.c */
+extern void fat_attach(struct inode *inode, loff_t i_pos);
+extern void fat_detach(struct inode *inode);
+extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
+extern struct inode *fat_build_inode(struct super_block *sb,
+                        struct msdos_dir_entry *de, loff_t i_pos);
+extern int fat_sync_inode(struct inode *inode);
+extern int fat_fill_super(struct super_block *sb, void *data, int silent,
+                        const struct inode_operations *fs_dir_inode_ops, int isvfat);
+
+extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
+                            struct inode *i2);
+/* fat/misc.c */
+extern void fat_fs_panic(struct super_block *s, const char *fmt, ...)
+        __attribute__ ((format (printf, 2, 3))) __cold;
+extern void fat_clusters_flush(struct super_block *sb);
+extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
+extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
+                              __le16 __time, __le16 __date, u8 time_cs);
+extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
+                              __le16 *time, __le16 *date, u8 *time_cs);
+extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
+
+int fat_cache_init(void);
+void fat_cache_destroy(void);
+
+/* helper for printk */
+typedef unsigned long long      llu;
+
+#endif /* !_FAT_H */
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index fb98b3d847e..da6eea47872 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -7,6 +7,7 @@
 #include <linux/fs.h>
 #include <linux/msdos_fs.h>
 #include <linux/blkdev.h>
+#include "fat.h"
 
 struct fatent_operations {
         void (*ent_blocknr)(struct super_block *, int, int *, sector_t *);
@@ -92,8 +93,7 @@ static int fat12_ent_bread(struct super_block *sb, struct fat_entry *fatent,
 err_brelse:
         brelse(bhs[0]);
 err:
-        printk(KERN_ERR "FAT: FAT read failed (blocknr %llu)\n",
-               (unsigned long long)blocknr);
+        printk(KERN_ERR "FAT: FAT read failed (blocknr %llu)\n", (llu)blocknr);
         return -EIO;
 }
 
@@ -106,7 +106,7 @@ static int fat_ent_bread(struct super_block *sb, struct fat_entry *fatent,
         fatent->bhs[0] = sb_bread(sb, blocknr);
         if (!fatent->bhs[0]) {
                 printk(KERN_ERR "FAT: FAT read failed (blocknr %llu)\n",
-                       (unsigned long long)blocknr);
+                       (llu)blocknr);
                 return -EIO;
         }
         fatent->nr_bhs = 1;
@@ -316,10 +316,20 @@ static inline int fat_ent_update_ptr(struct super_block *sb,
         /* Is this fatent's blocks including this entry? */
         if (!fatent->nr_bhs || bhs[0]->b_blocknr != blocknr)
                 return 0;
-        /* Does this entry need the next block? */
-        if (sbi->fat_bits == 12 && (offset + 1) >= sb->s_blocksize) {
-                if (fatent->nr_bhs != 2 || bhs[1]->b_blocknr != (blocknr + 1))
-                        return 0;
+        if (sbi->fat_bits == 12) {
+                if ((offset + 1) < sb->s_blocksize) {
+                        /* This entry is on bhs[0]. */
+                        if (fatent->nr_bhs == 2) {
+                                brelse(bhs[1]);
+                                fatent->nr_bhs = 1;
+                        }
+                } else {
+                        /* This entry needs the next block. */
+                        if (fatent->nr_bhs != 2)
+                                return 0;
+                        if (bhs[1]->b_blocknr != (blocknr + 1))
+                                return 0;
+                }
         }
         ops->ent_set_ptr(fatent, offset);
         return 1;
diff --git a/fs/fat/file.c b/fs/fat/file.c
index ddde37025ca..f06a4e525ec 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -10,13 +10,13 @@
 #include <linux/module.h>
 #include <linux/mount.h>
 #include <linux/time.h>
-#include <linux/msdos_fs.h>
 #include <linux/buffer_head.h>
 #include <linux/writeback.h>
 #include <linux/backing-dev.h>
 #include <linux/blkdev.h>
 #include <linux/fsnotify.h>
 #include <linux/security.h>
+#include "fat.h"
 
 int fat_generic_ioctl(struct inode *inode, struct file *filp,
                       unsigned int cmd, unsigned long arg)
@@ -29,10 +29,9 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
         {
                 u32 attr;
 
-                if (inode->i_ino == MSDOS_ROOT_INO)
-                        attr = ATTR_DIR;
-                else
-                        attr = fat_attr(inode);
+                mutex_lock(&inode->i_mutex);
+                attr = fat_make_attrs(inode);
+                mutex_unlock(&inode->i_mutex);
 
                 return put_user(attr, user_attr);
         }
@@ -62,20 +61,16 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
                 /* Merge in ATTR_VOLUME and ATTR_DIR */
                 attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
                         (is_dir ? ATTR_DIR : 0);
-                oldattr = fat_attr(inode);
+                oldattr = fat_make_attrs(inode);
 
                 /* Equivalent to a chmod() */
                 ia.ia_valid = ATTR_MODE | ATTR_CTIME;
                 ia.ia_ctime = current_fs_time(inode->i_sb);
-                if (is_dir) {
-                        ia.ia_mode = MSDOS_MKMODE(attr,
-                                S_IRWXUGO & ~sbi->options.fs_dmask)
-                                | S_IFDIR;
-                } else {
-                        ia.ia_mode = MSDOS_MKMODE(attr,
-                                (S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO))
-                                & ~sbi->options.fs_fmask)
-                                | S_IFREG;
+                if (is_dir)
+                        ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
+                else {
+                        ia.ia_mode = fat_make_mode(sbi, attr,
+                                S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
                 }
 
                 /* The root directory has no attributes */
@@ -115,7 +110,7 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
                                 inode->i_flags &= S_IMMUTABLE;
                 }
 
-                MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
+                fat_save_attrs(inode, attr);
                 mark_inode_dirty(inode);
 up:
                 mnt_drop_write(filp->f_path.mnt);
@@ -274,7 +269,7 @@ static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
 
         /*
          * Note, the basic check is already done by a caller of
-         * (attr->ia_mode & ~MSDOS_VALID_MODE)
+         * (attr->ia_mode & ~FAT_VALID_MODE)
          */
 
         if (S_ISREG(inode->i_mode))
@@ -287,11 +282,18 @@ static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
         /*
          * Of the r and x bits, all (subject to umask) must be present. Of the
          * w bits, either all (subject to umask) or none must be present.
+         *
+         * If fat_mode_can_hold_ro(inode) is false, can't change w bits.
          */
         if ((perm & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO)))
                 return -EPERM;
-        if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
-                return -EPERM;
+        if (fat_mode_can_hold_ro(inode)) {
+                if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
+                        return -EPERM;
+        } else {
+                if ((perm & S_IWUGO) != (S_IWUGO & ~mask))
+                        return -EPERM;
+        }
 
         *mode_ptr &= S_IFMT | perm;
 
@@ -314,13 +316,15 @@ static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
 }
 
 #define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)
+/* valid file mode bits */
+#define FAT_VALID_MODE  (S_IFREG | S_IFDIR | S_IRWXUGO)
 
 int fat_setattr(struct dentry *dentry, struct iattr *attr)
 {
         struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
         struct inode *inode = dentry->d_inode;
-        int error = 0;
         unsigned int ia_valid;
+        int error;
 
         /*
          * Expand the file. Since inode_setattr() updates ->i_size
@@ -356,7 +360,7 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
             ((attr->ia_valid & ATTR_GID) &&
              (attr->ia_gid != sbi->options.fs_gid)) ||
             ((attr->ia_valid & ATTR_MODE) &&
-             (attr->ia_mode & ~MSDOS_VALID_MODE)))
+             (attr->ia_mode & ~FAT_VALID_MODE)))
                 error = -EPERM;
 
         if (error) {
@@ -374,7 +378,8 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
                         attr->ia_valid &= ~ATTR_MODE;
         }
 
-        error = inode_setattr(inode, attr);
+        if (attr->ia_valid)
+                error = inode_setattr(inode, attr);
 out:
         return error;
 }
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 2b2eec1283b..bdd8fb7be2c 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -16,7 +16,6 @@
 #include <linux/slab.h>
 #include <linux/smp_lock.h>
 #include <linux/seq_file.h>
-#include <linux/msdos_fs.h>
 #include <linux/pagemap.h>
 #include <linux/mpage.h>
 #include <linux/buffer_head.h>
@@ -27,7 +26,9 @@
 #include <linux/uio.h>
 #include <linux/writeback.h>
 #include <linux/log2.h>
+#include <linux/hash.h>
 #include <asm/unaligned.h>
+#include "fat.h"
 
 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
 /* if user don't select VFAT, this is undefined. */
@@ -63,7 +64,7 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock,
         sector_t phys;
         int err, offset;
 
-        err = fat_bmap(inode, iblock, &phys, &mapped_blocks);
+        err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create);
         if (err)
                 return err;
         if (phys) {
@@ -93,7 +94,7 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock,
         *max_blocks = min(mapped_blocks, *max_blocks);
         MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits;
 
-        err = fat_bmap(inode, iblock, &phys, &mapped_blocks);
+        err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create);
         if (err)
                 return err;
 
@@ -198,7 +199,14 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
 
 static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
 {
-        return generic_block_bmap(mapping, block, fat_get_block);
+        sector_t blocknr;
+
+        /* fat_get_cluster() assumes the requested blocknr isn't truncated. */
+        mutex_lock(&mapping->host->i_mutex);
+        blocknr = generic_block_bmap(mapping, block, fat_get_block);
+        mutex_unlock(&mapping->host->i_mutex);
+
+        return blocknr;
 }
 
 static const struct address_space_operations fat_aops = {
@@ -247,25 +255,21 @@ static void fat_hash_init(struct super_block *sb)
                 INIT_HLIST_HEAD(&sbi->inode_hashtable[i]);
 }
 
-static inline unsigned long fat_hash(struct super_block *sb, loff_t i_pos)
+static inline unsigned long fat_hash(loff_t i_pos)
 {
-        unsigned long tmp = (unsigned long)i_pos | (unsigned long) sb;
-        tmp = tmp + (tmp >> FAT_HASH_BITS) + (tmp >> FAT_HASH_BITS * 2);
-        return tmp & FAT_HASH_MASK;
+        return hash_32(i_pos, FAT_HASH_BITS);
 }
 
 void fat_attach(struct inode *inode, loff_t i_pos)
 {
-        struct super_block *sb = inode->i_sb;
-        struct msdos_sb_info *sbi = MSDOS_SB(sb);
+        struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+        struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos);
 
         spin_lock(&sbi->inode_hash_lock);
         MSDOS_I(inode)->i_pos = i_pos;
-        hlist_add_head(&MSDOS_I(inode)->i_fat_hash,
-                        sbi->inode_hashtable + fat_hash(sb, i_pos));
+        hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head);
         spin_unlock(&sbi->inode_hash_lock);
 }
-
 EXPORT_SYMBOL_GPL(fat_attach);
 
 void fat_detach(struct inode *inode)
@@ -276,13 +280,12 @@ void fat_detach(struct inode *inode)
         hlist_del_init(&MSDOS_I(inode)->i_fat_hash);
         spin_unlock(&sbi->inode_hash_lock);
 }
-
 EXPORT_SYMBOL_GPL(fat_detach);
 
 struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
 {
         struct msdos_sb_info *sbi = MSDOS_SB(sb);
-        struct hlist_head *head = sbi->inode_hashtable + fat_hash(sb, i_pos);
+        struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos);
         struct hlist_node *_p;
         struct msdos_inode_info *i;
         struct inode *inode = NULL;
@@ -341,8 +344,7 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
 
         if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) {
                 inode->i_generation &= ~1;
-                inode->i_mode = MSDOS_MKMODE(de->attr,
-                        S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR;
+                inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO);
                 inode->i_op = sbi->dir_ops;
                 inode->i_fop = &fat_dir_operations;
 
@@ -359,10 +361,9 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
                 inode->i_nlink = fat_subdirs(inode);
         } else { /* not a directory */
                 inode->i_generation |= 1;
-                inode->i_mode = MSDOS_MKMODE(de->attr,
-                    ((sbi->options.showexec && !is_exec(de->name + 8))
-                        ? S_IRUGO|S_IWUGO : S_IRWXUGO)
-                    & ~sbi->options.fs_fmask) | S_IFREG;
+                inode->i_mode = fat_make_mode(sbi, de->attr,
+                        ((sbi->options.showexec && !is_exec(de->name + 8))
+                         ? S_IRUGO|S_IWUGO : S_IRWXUGO));
                 MSDOS_I(inode)->i_start = le16_to_cpu(de->start);
                 if (sbi->fat_bits == 32)
                         MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16);
@@ -378,25 +379,16 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
                 if (sbi->options.sys_immutable)
                         inode->i_flags |= S_IMMUTABLE;
         }
-        MSDOS_I(inode)->i_attrs = de->attr & ATTR_UNUSED;
+        fat_save_attrs(inode, de->attr);
+
         inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
                            & ~((loff_t)sbi->cluster_size - 1)) >> 9;
-        inode->i_mtime.tv_sec =
-                date_dos2unix(le16_to_cpu(de->time), le16_to_cpu(de->date),
-                              sbi->options.tz_utc);
-        inode->i_mtime.tv_nsec = 0;
+
+        fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0);
         if (sbi->options.isvfat) {
-                int secs = de->ctime_cs / 100;
-                int csecs = de->ctime_cs % 100;
-                inode->i_ctime.tv_sec  =
-                        date_dos2unix(le16_to_cpu(de->ctime),
-                                      le16_to_cpu(de->cdate),
-                                      sbi->options.tz_utc) + secs;
-                inode->i_ctime.tv_nsec = csecs * 10000000;
-                inode->i_atime.tv_sec =
-                        date_dos2unix(0, le16_to_cpu(de->adate),
-                                      sbi->options.tz_utc);
-                inode->i_atime.tv_nsec = 0;
+                fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime,
+                                  de->cdate, de->ctime_cs);
+                fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0);
         } else
                 inode->i_ctime = inode->i_atime = inode->i_mtime;
 
@@ -443,13 +435,8 @@ static void fat_delete_inode(struct inode *inode)
 
 static void fat_clear_inode(struct inode *inode)
 {
-        struct super_block *sb = inode->i_sb;
-        struct msdos_sb_info *sbi = MSDOS_SB(sb);
-
-        spin_lock(&sbi->inode_hash_lock);
         fat_cache_inval_inode(inode);
-        hlist_del_init(&MSDOS_I(inode)->i_fat_hash);
-        spin_unlock(&sbi->inode_hash_lock);
+        fat_detach(inode);
 }
 
 static void fat_write_super(struct super_block *sb)
@@ -555,6 +542,20 @@ static int fat_statfs(struct dentry *dentry, struct kstatfs *buf)
         return 0;
 }
 
+static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi,
+                                    struct inode *inode)
+{
+        loff_t i_pos;
+#if BITS_PER_LONG == 32
+        spin_lock(&sbi->inode_hash_lock);
+#endif
+        i_pos = MSDOS_I(inode)->i_pos;
+#if BITS_PER_LONG == 32
+        spin_unlock(&sbi->inode_hash_lock);
+#endif
+        return i_pos;
+}
+
 static int fat_write_inode(struct inode *inode, int wait)
 {
         struct super_block *sb = inode->i_sb;
@@ -564,9 +565,12 @@ static int fat_write_inode(struct inode *inode, int wait)
         loff_t i_pos;
         int err;
 
+        if (inode->i_ino == MSDOS_ROOT_INO)
+                return 0;
+
 retry:
-        i_pos = MSDOS_I(inode)->i_pos;
-        if (inode->i_ino == MSDOS_ROOT_INO || !i_pos)
+        i_pos = fat_i_pos_read(sbi, inode);
+        if (!i_pos)
                 return 0;
 
         bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits);
@@ -588,19 +592,17 @@ retry:
                 raw_entry->size = 0;
         else
                 raw_entry->size = cpu_to_le32(inode->i_size);
-        raw_entry->attr = fat_attr(inode);
+        raw_entry->attr = fat_make_attrs(inode);
         raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart);
         raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16);
-        fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time,
-                          &raw_entry->date, sbi->options.tz_utc);
+        fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time,
+                          &raw_entry->date, NULL);
         if (sbi->options.isvfat) {
                 __le16 atime;
-                fat_date_unix2dos(inode->i_ctime.tv_sec, &raw_entry->ctime,
-                                  &raw_entry->cdate, sbi->options.tz_utc);
-                fat_date_unix2dos(inode->i_atime.tv_sec, &atime,
-                                  &raw_entry->adate, sbi->options.tz_utc);
-                raw_entry->ctime_cs = (inode->i_ctime.tv_sec & 1) * 100 +
-                        inode->i_ctime.tv_nsec / 10000000;
+                fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime,
+                                  &raw_entry->cdate, &raw_entry->ctime_cs);
+                fat_time_unix2fat(sbi, &inode->i_atime, &atime,
+                                  &raw_entry->adate, NULL);
         }
         spin_unlock(&sbi->inode_hash_lock);
         mark_buffer_dirty(bh);
@@ -819,8 +821,10 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
                         seq_puts(m, ",uni_xlate");
                 if (!opts->numtail)
                         seq_puts(m, ",nonumtail");
+                if (opts->rodir)
+                        seq_puts(m, ",rodir");
         }
-        if (sbi->options.flush)
+        if (opts->flush)
                 seq_puts(m, ",flush");
         if (opts->tz_utc)
                 seq_puts(m, ",tz=UTC");
@@ -836,7 +840,7 @@ enum {
         Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
         Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
         Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
-        Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_err,
+        Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err,
 };
 
 static const match_table_t fat_tokens = {
@@ -908,6 +912,7 @@ static const match_table_t vfat_tokens = {
         {Opt_nonumtail_yes, "nonumtail=yes"},
         {Opt_nonumtail_yes, "nonumtail=true"},
         {Opt_nonumtail_yes, "nonumtail"},
+        {Opt_rodir, "rodir"},
         {Opt_err, NULL}
 };
 
@@ -927,10 +932,13 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
         opts->allow_utime = -1;
         opts->codepage = fat_default_codepage;
         opts->iocharset = fat_default_iocharset;
-        if (is_vfat)
+        if (is_vfat) {
                 opts->shortname = VFAT_SFN_DISPLAY_LOWER|VFAT_SFN_CREATE_WIN95;
-        else
+                opts->rodir = 0;
+        } else {
                 opts->shortname = 0;
+                opts->rodir = 1;
+        }
         opts->name_check = 'n';
         opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK =  0;
         opts->utf8 = opts->unicode_xlate = 0;
@@ -1081,6 +1089,9 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
                 case Opt_nonumtail_yes:         /* empty or 1 or yes or true */
                         opts->numtail = 0;      /* negated option */
                         break;
+                case Opt_rodir:
+                        opts->rodir = 1;
+                        break;
 
                 /* obsolete mount options */
                 case Opt_obsolate:
@@ -1126,7 +1137,7 @@ static int fat_read_root(struct inode *inode)
         inode->i_gid = sbi->options.fs_gid;
         inode->i_version++;
         inode->i_generation = 0;
-        inode->i_mode = (S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR;
+        inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO);
         inode->i_op = sbi->dir_ops;
         inode->i_fop = &fat_dir_operations;
         if (sbi->fat_bits == 32) {
@@ -1143,7 +1154,7 @@ static int fat_read_root(struct inode *inode)
         MSDOS_I(inode)->i_logstart = 0;
         MSDOS_I(inode)->mmu_private = inode->i_size;
 
-        MSDOS_I(inode)->i_attrs = ATTR_NONE;
+        fat_save_attrs(inode, ATTR_DIR);
         inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0;
         inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0;
         inode->i_nlink = fat_subdirs(inode)+2;
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 79fb98ad36d..ac39ebcc149 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -8,8 +8,8 @@
 
 #include <linux/module.h>
 #include <linux/fs.h>
-#include <linux/msdos_fs.h>
 #include <linux/buffer_head.h>
+#include "fat.h"
 
 /*
  * fat_fs_panic reports a severe file system problem and sets the file system
@@ -124,8 +124,9 @@ int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
                         mark_inode_dirty(inode);
         }
         if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) {
-                fat_fs_panic(sb, "clusters badly computed (%d != %lu)",
-                        new_fclus, inode->i_blocks >> (sbi->cluster_bits - 9));
+                fat_fs_panic(sb, "clusters badly computed (%d != %llu)",
+                             new_fclus,
+                             (llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));
                 fat_cache_inval_inode(inode);
         }
         inode->i_blocks += nr_cluster << (sbi->cluster_bits - 9);
@@ -135,65 +136,131 @@ int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
 
 extern struct timezone sys_tz;
 
+/*
+ * The epoch of FAT timestamp is 1980.
+ *     :  bits :     value
+ * date:  0 -  4: day   (1 -  31)
+ * date:  5 -  8: month (1 -  12)
+ * date:  9 - 15: year  (0 - 127) from 1980
+ * time:  0 -  4: sec   (0 -  29) 2sec counts
+ * time:  5 - 10: min   (0 -  59)
+ * time: 11 - 15: hour  (0 -  23)
+ */
+#define SECS_PER_MIN    60
+#define SECS_PER_HOUR   (60 * 60)
+#define SECS_PER_DAY    (SECS_PER_HOUR * 24)
+#define UNIX_SECS_1980  315532800L
+#if BITS_PER_LONG == 64
+#define UNIX_SECS_2108  4354819200L
+#endif
+/* days between 1.1.70 and 1.1.80 (2 leap days) */
+#define DAYS_DELTA      (365 * 10 + 2)
+/* 120 (2100 - 1980) isn't leap year */
+#define YEAR_2100       120
+#define IS_LEAP_YEAR(y) (!((y) & 3) && (y) != YEAR_2100)
+
 /* Linear day numbers of the respective 1sts in non-leap years. */
-static int day_n[] = {
-   /* Jan  Feb  Mar  Apr   May  Jun  Jul  Aug  Sep  Oct  Nov  Dec */
-        0,  31,  59,  90,  120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, 0
+static time_t days_in_year[] = {
+        /* Jan  Feb  Mar  Apr  May  Jun  Jul  Aug  Sep  Oct  Nov  Dec */
+        0,   0,  31,  59,  90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0,
 };
 
-/* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */
-int date_dos2unix(unsigned short time, unsigned short date, int tz_utc)
+/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */
+void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
+                       __le16 __time, __le16 __date, u8 time_cs)
 {
-        int month, year, secs;
+        u16 time = le16_to_cpu(__time), date = le16_to_cpu(__date);
+        time_t second, day, leap_day, month, year;
 
-        /*
-         * first subtract and mask after that... Otherwise, if
-         * date == 0, bad things happen
-         */
-        month = ((date >> 5) - 1) & 15;
-        year = date >> 9;
-        secs = (time & 31)*2+60*((time >> 5) & 63)+(time >> 11)*3600+86400*
-            ((date & 31)-1+day_n[month]+(year/4)+year*365-((year & 3) == 0 &&
-            month < 2 ? 1 : 0)+3653);
-                        /* days since 1.1.70 plus 80's leap day */
-        if (!tz_utc)
-                secs += sys_tz.tz_minuteswest*60;
-        return secs;
+        year  = date >> 9;
+        month = max(1, (date >> 5) & 0xf);
+        day   = max(1, date & 0x1f) - 1;
+
+        leap_day = (year + 3) / 4;
+        if (year > YEAR_2100)           /* 2100 isn't leap year */
+                leap_day--;
+        if (IS_LEAP_YEAR(year) && month > 2)
+                leap_day++;
+
+        second =  (time & 0x1f) << 1;
+        second += ((time >> 5) & 0x3f) * SECS_PER_MIN;
+        second += (time >> 11) * SECS_PER_HOUR;
+        second += (year * 365 + leap_day
+                   + days_in_year[month] + day
+                   + DAYS_DELTA) * SECS_PER_DAY;
+
+        if (!sbi->options.tz_utc)
+                second += sys_tz.tz_minuteswest * SECS_PER_MIN;
+
+        if (time_cs) {
+                ts->tv_sec = second + (time_cs / 100);
+                ts->tv_nsec = (time_cs % 100) * 10000000;
+        } else {
+                ts->tv_sec = second;
+                ts->tv_nsec = 0;
+        }
 }
 
-/* Convert linear UNIX date to a MS-DOS time/date pair. */
-void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date, int tz_utc)
+/* Convert linear UNIX date to a FAT time/date pair. */
+void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
+                       __le16 *time, __le16 *date, u8 *time_cs)
 {
-        int day, year, nl_day, month;
+        time_t second = ts->tv_sec;
+        time_t day, leap_day, month, year;
 
-        if (!tz_utc)
-                unix_date -= sys_tz.tz_minuteswest*60;
+        if (!sbi->options.tz_utc)
+                second -= sys_tz.tz_minuteswest * SECS_PER_MIN;
 
         /* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
-        if (unix_date < 315532800)
-                unix_date = 315532800;
-
-        *time = cpu_to_le16((unix_date % 60)/2+(((unix_date/60) % 60) << 5)+
-            (((unix_date/3600) % 24) << 11));
-        day = unix_date/86400-3652;
-        year = day/365;
-        if ((year+3)/4+365*year > day)
+        if (second < UNIX_SECS_1980) {
+                *time = 0;
+                *date = cpu_to_le16((0 << 9) | (1 << 5) | 1);
+                if (time_cs)
+                        *time_cs = 0;
+                return;
+        }
+#if BITS_PER_LONG == 64
+        if (second >= UNIX_SECS_2108) {
+                *time = cpu_to_le16((23 << 11) | (59 << 5) | 29);
+                *date = cpu_to_le16((127 << 9) | (12 << 5) | 31);
+                if (time_cs)
+                        *time_cs = 199;
+                return;
+        }
+#endif
+
+        day = second / SECS_PER_DAY - DAYS_DELTA;
+        year = day / 365;
+        leap_day = (year + 3) / 4;
+        if (year > YEAR_2100)           /* 2100 isn't leap year */
+                leap_day--;
+        if (year * 365 + leap_day > day)
                 year--;
-        day -= (year+3)/4+365*year;
-        if (day == 59 && !(year & 3)) {
-                nl_day = day;
+        leap_day = (year + 3) / 4;
+        if (year > YEAR_2100)           /* 2100 isn't leap year */
+                leap_day--;
+        day -= year * 365 + leap_day;
+
+        if (IS_LEAP_YEAR(year) && day == days_in_year[3]) {
                 month = 2;
         } else {
-                nl_day = (year & 3) || day <= 59 ? day : day-1;
-                for (month = 0; month < 12; month++) {
-                        if (day_n[month] > nl_day)
+                if (IS_LEAP_YEAR(year) && day > days_in_year[3])
+                        day--;
+                for (month = 1; month < 12; month++) {
+                        if (days_in_year[month + 1] > day)
                                 break;
                 }
         }
-        *date = cpu_to_le16(nl_day-day_n[month-1]+1+(month << 5)+(year << 9));
-}
+        day -= days_in_year[month];
 
-EXPORT_SYMBOL_GPL(fat_date_unix2dos);
+        *time = cpu_to_le16(((second / SECS_PER_HOUR) % 24) << 11
+                            | ((second / SECS_PER_MIN) % 60) << 5
+                            | (second % SECS_PER_MIN) >> 1);
+        *date = cpu_to_le16((year << 9) | (month << 5) | (day + 1));
+        if (time_cs)
+                *time_cs = (ts->tv_sec & 1) * 100 + ts->tv_nsec / 10000000;
+}
+EXPORT_SYMBOL_GPL(fat_time_unix2fat);
 
 int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
 {
diff --git a/fs/msdos/namei.c b/fs/fat/namei_msdos.c
index e844b9809d2..7ba03a4acbe 100644
--- a/fs/msdos/namei.c
+++ b/fs/fat/namei_msdos.c
@@ -9,8 +9,8 @@
 #include <linux/module.h>
 #include <linux/time.h>
 #include <linux/buffer_head.h>
-#include <linux/msdos_fs.h>
 #include <linux/smp_lock.h>
+#include "fat.h"
 
 /* Characters that are undesirable in an MS-DOS file name */
 static unsigned char bad_chars[] = "*?<>|\"";
@@ -203,33 +203,37 @@ static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
 {
         struct super_block *sb = dir->i_sb;
         struct fat_slot_info sinfo;
-        struct inode *inode = NULL;
-        int res;
-
-        dentry->d_op = &msdos_dentry_operations;
+        struct inode *inode;
+        int err;
 
         lock_super(sb);
-        res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
-        if (res == -ENOENT)
-                goto add;
-        if (res < 0)
-                goto out;
+
+        err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
+        if (err) {
+                if (err == -ENOENT) {
+                        inode = NULL;
+                        goto out;
+                }
+                goto error;
+        }
+
         inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
         brelse(sinfo.bh);
         if (IS_ERR(inode)) {
-                res = PTR_ERR(inode);
-                goto out;
+                err = PTR_ERR(inode);
+                goto error;
         }
-add:
-        res = 0;
+out:
+        unlock_super(sb);
+        dentry->d_op = &msdos_dentry_operations;
         dentry = d_splice_alias(inode, dentry);
         if (dentry)
                 dentry->d_op = &msdos_dentry_operations;
-out:
+        return dentry;
+
+error:
         unlock_super(sb);
-        if (!res)
-                return dentry;
-        return ERR_PTR(res);
+        return ERR_PTR(err);
 }
 
 /***** Creates a directory entry (name is already formatted). */
@@ -247,7 +251,7 @@ static int msdos_add_entry(struct inode *dir, const unsigned char *name,
         if (is_hid)
                 de.attr |= ATTR_HIDDEN;
         de.lcase = 0;
-        fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
+        fat_time_unix2fat(sbi, ts, &time, &date, NULL);
         de.cdate = de.adate = 0;
         de.ctime = 0;
         de.ctime_cs = 0;
diff --git a/fs/vfat/namei.c b/fs/fat/namei_vfat.c
index 155c10b4adb..bf326d4356a 100644
--- a/fs/vfat/namei.c
+++ b/fs/fat/namei_vfat.c
@@ -16,36 +16,75 @@
  */
 
 #include <linux/module.h>
-
 #include <linux/jiffies.h>
-#include <linux/msdos_fs.h>
 #include <linux/ctype.h>
 #include <linux/slab.h>
 #include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 #include <linux/namei.h>
+#include "fat.h"
 
-static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
+/*
+ * If new entry was created in the parent, it could create the 8.3
+ * alias (the shortname of logname).  So, the parent may have the
+ * negative-dentry which matches the created 8.3 alias.
+ *
+ * If it happened, the negative dentry isn't actually negative
+ * anymore.  So, drop it.
+ */
+static int vfat_revalidate_shortname(struct dentry *dentry)
 {
         int ret = 1;
-
-        if (!dentry->d_inode &&
-            nd && !(nd->flags & LOOKUP_CONTINUE) && (nd->flags & LOOKUP_CREATE))
-                /*
-                 * negative dentry is dropped, in order to make sure
-                 * to use the name which a user desires if this is
-                 * create path.
-                 */
+        spin_lock(&dentry->d_lock);
+        if (dentry->d_time != dentry->d_parent->d_inode->i_version)
                 ret = 0;
-        else {
-                spin_lock(&dentry->d_lock);
-                if (dentry->d_time != dentry->d_parent->d_inode->i_version)
-                        ret = 0;
-                spin_unlock(&dentry->d_lock);
-        }
+        spin_unlock(&dentry->d_lock);
         return ret;
 }
 
+static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+        /* This is not negative dentry. Always valid. */
+        if (dentry->d_inode)
+                return 1;
+        return vfat_revalidate_shortname(dentry);
+}
+
+static int vfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd)
+{
+        /*
+         * This is not negative dentry. Always valid.
+         *
+         * Note, rename() to existing directory entry will have ->d_inode,
+         * and will use existing name which isn't specified name by user.
+         *
+         * We may be able to drop this positive dentry here. But dropping
+         * positive dentry isn't good idea. So it's unsupported like
+         * rename("filename", "FILENAME") for now.
+         */
+        if (dentry->d_inode)
+                return 1;
+
+        /*
+         * This may be nfsd (or something), anyway, we can't see the
+         * intent of this. So, since this can be for creation, drop it.
+         */
+        if (!nd)
+                return 0;
+
+        /*
+         * Drop the negative dentry, in order to make sure to use the
+         * case sensitive name which is specified by user if this is
+         * for creation.
+         */
+        if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) {
+                if (nd->flags & LOOKUP_CREATE)
+                        return 0;
+        }
+
+        return vfat_revalidate_shortname(dentry);
+}
+
 /* returns the length of a struct qstr, ignoring trailing dots */
 static unsigned int vfat_striptail_len(struct qstr *qstr)
 {
@@ -127,25 +166,16 @@ static int vfat_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b)
         return 1;
 }
 
-static struct dentry_operations vfat_dentry_ops[4] = {
-        {
-                .d_hash         = vfat_hashi,
-                .d_compare      = vfat_cmpi,
-        },
-        {
-                .d_revalidate   = vfat_revalidate,
-                .d_hash         = vfat_hashi,
-                .d_compare      = vfat_cmpi,
-        },
-        {
-                .d_hash         = vfat_hash,
-                .d_compare      = vfat_cmp,
-        },
-        {
-                .d_revalidate   = vfat_revalidate,
-                .d_hash         = vfat_hash,
-                .d_compare      = vfat_cmp,
-        }
+static struct dentry_operations vfat_ci_dentry_ops = {
+        .d_revalidate   = vfat_revalidate_ci,
+        .d_hash         = vfat_hashi,
+        .d_compare      = vfat_cmpi,
+};
+
+static struct dentry_operations vfat_dentry_ops = {
+        .d_revalidate   = vfat_revalidate,
+        .d_hash         = vfat_hash,
+        .d_compare      = vfat_cmp,
 };
 
 /* Characters that are undesirable in an MS-DOS file name */
@@ -569,6 +599,7 @@ static int vfat_build_slots(struct inode *dir, const unsigned char *name,
         unsigned char msdos_name[MSDOS_NAME];
         wchar_t *uname;
         __le16 time, date;
+        u8 time_cs;
         int err, ulen, usize, i;
         loff_t offset;
 
@@ -621,10 +652,10 @@ shortname:
         memcpy(de->name, msdos_name, MSDOS_NAME);
         de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
         de->lcase = lcase;
-        fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
+        fat_time_unix2fat(sbi, ts, &time, &date, &time_cs);
         de->time = de->ctime = time;
         de->date = de->cdate = de->adate = date;
-        de->ctime_cs = 0;
+        de->ctime_cs = time_cs;
         de->start = cpu_to_le16(cluster);
         de->starthi = cpu_to_le16(cluster >> 16);
         de->size = 0;
@@ -683,46 +714,58 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
 {
         struct super_block *sb = dir->i_sb;
         struct fat_slot_info sinfo;
-        struct inode *inode = NULL;
+        struct inode *inode;
         struct dentry *alias;
-        int err, table;
+        int err;
 
         lock_super(sb);
-        table = (MSDOS_SB(sb)->options.name_check == 's') ? 2 : 0;
-        dentry->d_op = &vfat_dentry_ops[table];
 
         err = vfat_find(dir, &dentry->d_name, &sinfo);
         if (err) {
-                table++;
+                if (err == -ENOENT) {
+                        inode = NULL;
+                        goto out;
+                }
                 goto error;
         }
+
         inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
         brelse(sinfo.bh);
         if (IS_ERR(inode)) {
-                unlock_super(sb);
-                return ERR_CAST(inode);
+                err = PTR_ERR(inode);
+                goto error;
         }
-        alias = d_find_alias(inode);
-        if (alias) {
-                if (d_invalidate(alias) == 0)
-                        dput(alias);
-                else {
-                        iput(inode);
-                        unlock_super(sb);
-                        return alias;
-                }
 
+        alias = d_find_alias(inode);
+        if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
+                /*
+                 * This inode has non DCACHE_DISCONNECTED dentry. This
+                 * means, the user did ->lookup() by an another name
+                 * (longname vs 8.3 alias of it) in past.
+                 *
+                 * Switch to new one for reason of locality if possible.
+                 */
+                BUG_ON(d_unhashed(alias));
+                if (!S_ISDIR(inode->i_mode))
+                        d_move(alias, dentry);
+                iput(inode);
+                unlock_super(sb);
+                return alias;
         }
-error:
+out:
         unlock_super(sb);
-        dentry->d_op = &vfat_dentry_ops[table];
+        dentry->d_op = sb->s_root->d_op;
         dentry->d_time = dentry->d_parent->d_inode->i_version;
         dentry = d_splice_alias(inode, dentry);
         if (dentry) {
-                dentry->d_op = &vfat_dentry_ops[table];
+                dentry->d_op = sb->s_root->d_op;
                 dentry->d_time = dentry->d_parent->d_inode->i_version;
         }
         return dentry;
+
+error:
+        unlock_super(sb);
+        return ERR_PTR(err);
 }
 
 static int vfat_create(struct inode *dir, struct dentry *dentry, int mode,
@@ -1014,9 +1057,9 @@ static int vfat_fill_super(struct super_block *sb, void *data, int silent)
                 return res;
 
         if (MSDOS_SB(sb)->options.name_check != 's')
-                sb->s_root->d_op = &vfat_dentry_ops[0];
+                sb->s_root->d_op = &vfat_ci_dentry_ops;
         else
-                sb->s_root->d_op = &vfat_dentry_ops[2];
+                sb->s_root->d_op = &vfat_dentry_ops;
 
         return 0;
 }
diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c
index 8adebd3e43c..3cceef4ad2b 100644
--- a/fs/jffs2/background.c
+++ b/fs/jffs2/background.c
@@ -85,15 +85,15 @@ static int jffs2_garbage_collect_thread(void *_c)
         for (;;) {
                 allow_signal(SIGHUP);
         again:
+                spin_lock(&c->erase_completion_lock);
                 if (!jffs2_thread_should_wake(c)) {
                         set_current_state (TASK_INTERRUPTIBLE);
+                        spin_unlock(&c->erase_completion_lock);
                         D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread sleeping...\n"));
-                        /* Yes, there's a race here; we checked jffs2_thread_should_wake()
-                           before setting current->state to TASK_INTERRUPTIBLE. But it doesn't
-                           matter - We don't care if we miss a wakeup, because the GC thread
-                           is only an optimisation anyway. */
                         schedule();
-                }
+                } else
+                        spin_unlock(&c->erase_completion_lock);
+                        
 
                 /* This thread is purely an optimisation. But if it runs when
                    other things could be running, it actually makes things a
diff --git a/fs/jffs2/compr_lzo.c b/fs/jffs2/compr_lzo.c
index 47b045797e4..90cb60d0978 100644
--- a/fs/jffs2/compr_lzo.c
+++ b/fs/jffs2/compr_lzo.c
@@ -19,7 +19,7 @@
 
 static void *lzo_mem;
 static void *lzo_compress_buf;
-static DEFINE_MUTEX(deflate_mutex);
+static DEFINE_MUTEX(deflate_mutex);     /* for lzo_mem and lzo_compress_buf */
 
 static void free_workspace(void)
 {
@@ -49,18 +49,21 @@ static int jffs2_lzo_compress(unsigned char *data_in, unsigned char *cpage_out,
 
         mutex_lock(&deflate_mutex);
         ret = lzo1x_1_compress(data_in, *sourcelen, lzo_compress_buf, &compress_size, lzo_mem);
-        mutex_unlock(&deflate_mutex);
-
         if (ret != LZO_E_OK)
-                return -1;
+                goto fail;
 
         if (compress_size > *dstlen)
-                return -1;
+                goto fail;
 
         memcpy(cpage_out, lzo_compress_buf, compress_size);
-        *dstlen = compress_size;
+        mutex_unlock(&deflate_mutex);
 
+        *dstlen = compress_size;
         return 0;
+
+ fail:
+        mutex_unlock(&deflate_mutex);
+        return -1;
 }
 
 static int jffs2_lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,
diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c
index 0875b60b4bf..21a052915aa 100644
--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -261,9 +261,11 @@ static int jffs2_find_nextblock(struct jffs2_sb_info *c)
 
         jffs2_sum_reset_collected(c->summary); /* reset collected summary */
 
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
         /* adjust write buffer offset, else we get a non contiguous write bug */
         if (!(c->wbuf_ofs % c->sector_size) && !c->wbuf_len)
                 c->wbuf_ofs = 0xffffffff;
+#endif
 
         D1(printk(KERN_DEBUG "jffs2_find_nextblock(): new nextblock = 0x%08x\n", c->nextblock->offset));
 
diff --git a/fs/msdos/Makefile b/fs/msdos/Makefile
deleted file mode 100644
index ea67646fcb9..00000000000
--- a/fs/msdos/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Makefile for the Linux msdos filesystem routines.
-#
-
-obj-$(CONFIG_MSDOS_FS) += msdos.o
-
-msdos-y := namei.o
diff --git a/fs/vfat/Makefile b/fs/vfat/Makefile
deleted file mode 100644
index 40f2798a4f0..00000000000
--- a/fs/vfat/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Makefile for the linux vfat-filesystem routines.
-#
-
-obj-$(CONFIG_VFAT_FS) += vfat.o
-
-vfat-y := namei.o