fat: move fs/vfat/* and fs/msdos/* to fs/fat
authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Thu, 6 Nov 2008 20:53:45 +0000 (12:53 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 6 Nov 2008 23:41:20 +0000 (15:41 -0800)
This just moves those files, but change link order from MSDOS, VFAT to
VFAT, MSDOS.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/Makefile
fs/fat/Makefile
fs/fat/namei_msdos.c [new file with mode: 0644]
fs/fat/namei_vfat.c [new file with mode: 0644]
fs/msdos/Makefile [deleted file]
fs/msdos/namei.c [deleted file]
fs/vfat/Makefile [deleted file]
fs/vfat/namei.c [deleted file]

index 2168c902d5ca61027236bb75812591d16575ec1d..d9f8afe6f0c4b806ab7af81f8bcbc286758297cd 100644 (file)
@@ -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+
index bfb5f06cf2c8c86cd39b7704f8a5c6ca69763b94..e06190322c1c8af1544034c1476f3c779b165318 100644 (file)
@@ -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/namei_msdos.c b/fs/fat/namei_msdos.c
new file mode 100644 (file)
index 0000000..e844b98
--- /dev/null
@@ -0,0 +1,702 @@
+/*
+ *  linux/fs/msdos/namei.c
+ *
+ *  Written 1992,1993 by Werner Almesberger
+ *  Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
+ *  Rewritten for constant inumbers 1999 by Al Viro
+ */
+
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/buffer_head.h>
+#include <linux/msdos_fs.h>
+#include <linux/smp_lock.h>
+
+/* Characters that are undesirable in an MS-DOS file name */
+static unsigned char bad_chars[] = "*?<>|\"";
+static unsigned char bad_if_strict[] = "+=,; ";
+
+/***** Formats an MS-DOS file name. Rejects invalid names. */
+static int msdos_format_name(const unsigned char *name, int len,
+                            unsigned char *res, struct fat_mount_options *opts)
+       /*
+        * name is the proposed name, len is its length, res is
+        * the resulting name, opts->name_check is either (r)elaxed,
+        * (n)ormal or (s)trict, opts->dotsOK allows dots at the
+        * beginning of name (for hidden files)
+        */
+{
+       unsigned char *walk;
+       unsigned char c;
+       int space;
+
+       if (name[0] == '.') {   /* dotfile because . and .. already done */
+               if (opts->dotsOK) {
+                       /* Get rid of dot - test for it elsewhere */
+                       name++;
+                       len--;
+               } else
+                       return -EINVAL;
+       }
+       /*
+        * disallow names that _really_ start with a dot
+        */
+       space = 1;
+       c = 0;
+       for (walk = res; len && walk - res < 8; walk++) {
+               c = *name++;
+               len--;
+               if (opts->name_check != 'r' && strchr(bad_chars, c))
+                       return -EINVAL;
+               if (opts->name_check == 's' && strchr(bad_if_strict, c))
+                       return -EINVAL;
+               if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
+                       return -EINVAL;
+               if (c < ' ' || c == ':' || c == '\\')
+                       return -EINVAL;
+       /*
+        * 0xE5 is legal as a first character, but we must substitute
+        * 0x05 because 0xE5 marks deleted files.  Yes, DOS really
+        * does this.
+        * It seems that Microsoft hacked DOS to support non-US
+        * characters after the 0xE5 character was already in use to
+        * mark deleted files.
+        */
+               if ((res == walk) && (c == 0xE5))
+                       c = 0x05;
+               if (c == '.')
+                       break;
+               space = (c == ' ');
+               *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c;
+       }
+       if (space)
+               return -EINVAL;
+       if (opts->name_check == 's' && len && c != '.') {
+               c = *name++;
+               len--;
+               if (c != '.')
+                       return -EINVAL;
+       }
+       while (c != '.' && len--)
+               c = *name++;
+       if (c == '.') {
+               while (walk - res < 8)
+                       *walk++ = ' ';
+               while (len > 0 && walk - res < MSDOS_NAME) {
+                       c = *name++;
+                       len--;
+                       if (opts->name_check != 'r' && strchr(bad_chars, c))
+                               return -EINVAL;
+                       if (opts->name_check == 's' &&
+                           strchr(bad_if_strict, c))
+                               return -EINVAL;
+                       if (c < ' ' || c == ':' || c == '\\')
+                               return -EINVAL;
+                       if (c == '.') {
+                               if (opts->name_check == 's')
+                                       return -EINVAL;
+                               break;
+                       }
+                       if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
+                               return -EINVAL;
+                       space = c == ' ';
+                       if (!opts->nocase && c >= 'a' && c <= 'z')
+                               *walk++ = c - 32;
+                       else
+                               *walk++ = c;
+               }
+               if (space)
+                       return -EINVAL;
+               if (opts->name_check == 's' && len)
+                       return -EINVAL;
+       }
+       while (walk - res < MSDOS_NAME)
+               *walk++ = ' ';
+
+       return 0;
+}
+
+/***** Locates a directory entry.  Uses unformatted name. */
+static int msdos_find(struct inode *dir, const unsigned char *name, int len,
+                     struct fat_slot_info *sinfo)
+{
+       struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
+       unsigned char msdos_name[MSDOS_NAME];
+       int err;
+
+       err = msdos_format_name(name, len, msdos_name, &sbi->options);
+       if (err)
+               return -ENOENT;
+
+       err = fat_scan(dir, msdos_name, sinfo);
+       if (!err && sbi->options.dotsOK) {
+               if (name[0] == '.') {
+                       if (!(sinfo->de->attr & ATTR_HIDDEN))
+                               err = -ENOENT;
+               } else {
+                       if (sinfo->de->attr & ATTR_HIDDEN)
+                               err = -ENOENT;
+               }
+               if (err)
+                       brelse(sinfo->bh);
+       }
+       return err;
+}
+
+/*
+ * Compute the hash for the msdos name corresponding to the dentry.
+ * Note: if the name is invalid, we leave the hash code unchanged so
+ * that the existing dentry can be used. The msdos fs routines will
+ * return ENOENT or EINVAL as appropriate.
+ */
+static int msdos_hash(struct dentry *dentry, struct qstr *qstr)
+{
+       struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
+       unsigned char msdos_name[MSDOS_NAME];
+       int error;
+
+       error = msdos_format_name(qstr->name, qstr->len, msdos_name, options);
+       if (!error)
+               qstr->hash = full_name_hash(msdos_name, MSDOS_NAME);
+       return 0;
+}
+
+/*
+ * Compare two msdos names. If either of the names are invalid,
+ * we fall back to doing the standard name comparison.
+ */
+static int msdos_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b)
+{
+       struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
+       unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME];
+       int error;
+
+       error = msdos_format_name(a->name, a->len, a_msdos_name, options);
+       if (error)
+               goto old_compare;
+       error = msdos_format_name(b->name, b->len, b_msdos_name, options);
+       if (error)
+               goto old_compare;
+       error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME);
+out:
+       return error;
+
+old_compare:
+       error = 1;
+       if (a->len == b->len)
+               error = memcmp(a->name, b->name, a->len);
+       goto out;
+}
+
+static struct dentry_operations msdos_dentry_operations = {
+       .d_hash         = msdos_hash,
+       .d_compare      = msdos_cmp,
+};
+
+/*
+ * AV. Wrappers for FAT sb operations. Is it wise?
+ */
+
+/***** Get inode using directory and name */
+static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
+                                  struct nameidata *nd)
+{
+       struct super_block *sb = dir->i_sb;
+       struct fat_slot_info sinfo;
+       struct inode *inode = NULL;
+       int res;
+
+       dentry->d_op = &msdos_dentry_operations;
+
+       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;
+       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
+       brelse(sinfo.bh);
+       if (IS_ERR(inode)) {
+               res = PTR_ERR(inode);
+               goto out;
+       }
+add:
+       res = 0;
+       dentry = d_splice_alias(inode, dentry);
+       if (dentry)
+               dentry->d_op = &msdos_dentry_operations;
+out:
+       unlock_super(sb);
+       if (!res)
+               return dentry;
+       return ERR_PTR(res);
+}
+
+/***** Creates a directory entry (name is already formatted). */
+static int msdos_add_entry(struct inode *dir, const unsigned char *name,
+                          int is_dir, int is_hid, int cluster,
+                          struct timespec *ts, struct fat_slot_info *sinfo)
+{
+       struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
+       struct msdos_dir_entry de;
+       __le16 time, date;
+       int err;
+
+       memcpy(de.name, name, MSDOS_NAME);
+       de.attr = is_dir ? ATTR_DIR : ATTR_ARCH;
+       if (is_hid)
+               de.attr |= ATTR_HIDDEN;
+       de.lcase = 0;
+       fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
+       de.cdate = de.adate = 0;
+       de.ctime = 0;
+       de.ctime_cs = 0;
+       de.time = time;
+       de.date = date;
+       de.start = cpu_to_le16(cluster);
+       de.starthi = cpu_to_le16(cluster >> 16);
+       de.size = 0;
+
+       err = fat_add_entries(dir, &de, 1, sinfo);
+       if (err)
+               return err;
+
+       dir->i_ctime = dir->i_mtime = *ts;
+       if (IS_DIRSYNC(dir))
+               (void)fat_sync_inode(dir);
+       else
+               mark_inode_dirty(dir);
+
+       return 0;
+}
+
+/***** Create a file */
+static int msdos_create(struct inode *dir, struct dentry *dentry, int mode,
+                       struct nameidata *nd)
+{
+       struct super_block *sb = dir->i_sb;
+       struct inode *inode = NULL;
+       struct fat_slot_info sinfo;
+       struct timespec ts;
+       unsigned char msdos_name[MSDOS_NAME];
+       int err, is_hid;
+
+       lock_super(sb);
+
+       err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
+                               msdos_name, &MSDOS_SB(sb)->options);
+       if (err)
+               goto out;
+       is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
+       /* Have to do it due to foo vs. .foo conflicts */
+       if (!fat_scan(dir, msdos_name, &sinfo)) {
+               brelse(sinfo.bh);
+               err = -EINVAL;
+               goto out;
+       }
+
+       ts = CURRENT_TIME_SEC;
+       err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo);
+       if (err)
+               goto out;
+       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
+       brelse(sinfo.bh);
+       if (IS_ERR(inode)) {
+               err = PTR_ERR(inode);
+               goto out;
+       }
+       inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+       /* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+       d_instantiate(dentry, inode);
+out:
+       unlock_super(sb);
+       if (!err)
+               err = fat_flush_inodes(sb, dir, inode);
+       return err;
+}
+
+/***** Remove a directory */
+static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
+{
+       struct super_block *sb = dir->i_sb;
+       struct inode *inode = dentry->d_inode;
+       struct fat_slot_info sinfo;
+       int err;
+
+       lock_super(sb);
+       /*
+        * Check whether the directory is not in use, then check
+        * whether it is empty.
+        */
+       err = fat_dir_empty(inode);
+       if (err)
+               goto out;
+       err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
+       if (err)
+               goto out;
+
+       err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
+       if (err)
+               goto out;
+       drop_nlink(dir);
+
+       clear_nlink(inode);
+       inode->i_ctime = CURRENT_TIME_SEC;
+       fat_detach(inode);
+out:
+       unlock_super(sb);
+       if (!err)
+               err = fat_flush_inodes(sb, dir, inode);
+
+       return err;
+}
+
+/***** Make a directory */
+static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+       struct super_block *sb = dir->i_sb;
+       struct fat_slot_info sinfo;
+       struct inode *inode;
+       unsigned char msdos_name[MSDOS_NAME];
+       struct timespec ts;
+       int err, is_hid, cluster;
+
+       lock_super(sb);
+
+       err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
+                               msdos_name, &MSDOS_SB(sb)->options);
+       if (err)
+               goto out;
+       is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
+       /* foo vs .foo situation */
+       if (!fat_scan(dir, msdos_name, &sinfo)) {
+               brelse(sinfo.bh);
+               err = -EINVAL;
+               goto out;
+       }
+
+       ts = CURRENT_TIME_SEC;
+       cluster = fat_alloc_new_dir(dir, &ts);
+       if (cluster < 0) {
+               err = cluster;
+               goto out;
+       }
+       err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo);
+       if (err)
+               goto out_free;
+       inc_nlink(dir);
+
+       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
+       brelse(sinfo.bh);
+       if (IS_ERR(inode)) {
+               err = PTR_ERR(inode);
+               /* the directory was completed, just return a error */
+               goto out;
+       }
+       inode->i_nlink = 2;
+       inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+       /* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+       d_instantiate(dentry, inode);
+
+       unlock_super(sb);
+       fat_flush_inodes(sb, dir, inode);
+       return 0;
+
+out_free:
+       fat_free_clusters(dir, cluster);
+out:
+       unlock_super(sb);
+       return err;
+}
+
+/***** Unlink a file */
+static int msdos_unlink(struct inode *dir, struct dentry *dentry)
+{
+       struct inode *inode = dentry->d_inode;
+       struct super_block *sb= inode->i_sb;
+       struct fat_slot_info sinfo;
+       int err;
+
+       lock_super(sb);
+       err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
+       if (err)
+               goto out;
+
+       err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
+       if (err)
+               goto out;
+       clear_nlink(inode);
+       inode->i_ctime = CURRENT_TIME_SEC;
+       fat_detach(inode);
+out:
+       unlock_super(sb);
+       if (!err)
+               err = fat_flush_inodes(sb, dir, inode);
+
+       return err;
+}
+
+static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
+                          struct dentry *old_dentry,
+                          struct inode *new_dir, unsigned char *new_name,
+                          struct dentry *new_dentry, int is_hid)
+{
+       struct buffer_head *dotdot_bh;
+       struct msdos_dir_entry *dotdot_de;
+       struct inode *old_inode, *new_inode;
+       struct fat_slot_info old_sinfo, sinfo;
+       struct timespec ts;
+       loff_t dotdot_i_pos, new_i_pos;
+       int err, old_attrs, is_dir, update_dotdot, corrupt = 0;
+
+       old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
+       old_inode = old_dentry->d_inode;
+       new_inode = new_dentry->d_inode;
+
+       err = fat_scan(old_dir, old_name, &old_sinfo);
+       if (err) {
+               err = -EIO;
+               goto out;
+       }
+
+       is_dir = S_ISDIR(old_inode->i_mode);
+       update_dotdot = (is_dir && old_dir != new_dir);
+       if (update_dotdot) {
+               if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
+                                        &dotdot_i_pos) < 0) {
+                       err = -EIO;
+                       goto out;
+               }
+       }
+
+       old_attrs = MSDOS_I(old_inode)->i_attrs;
+       err = fat_scan(new_dir, new_name, &sinfo);
+       if (!err) {
+               if (!new_inode) {
+                       /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */
+                       if (sinfo.de != old_sinfo.de) {
+                               err = -EINVAL;
+                               goto out;
+                       }
+                       if (is_hid)
+                               MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
+                       else
+                               MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
+                       if (IS_DIRSYNC(old_dir)) {
+                               err = fat_sync_inode(old_inode);
+                               if (err) {
+                                       MSDOS_I(old_inode)->i_attrs = old_attrs;
+                                       goto out;
+                               }
+                       } else
+                               mark_inode_dirty(old_inode);
+
+                       old_dir->i_version++;
+                       old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
+                       if (IS_DIRSYNC(old_dir))
+                               (void)fat_sync_inode(old_dir);
+                       else
+                               mark_inode_dirty(old_dir);
+                       goto out;
+               }
+       }
+
+       ts = CURRENT_TIME_SEC;
+       if (new_inode) {
+               if (err)
+                       goto out;
+               if (is_dir) {
+                       err = fat_dir_empty(new_inode);
+                       if (err)
+                               goto out;
+               }
+               new_i_pos = MSDOS_I(new_inode)->i_pos;
+               fat_detach(new_inode);
+       } else {
+               err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0,
+                                     &ts, &sinfo);
+               if (err)
+                       goto out;
+               new_i_pos = sinfo.i_pos;
+       }
+       new_dir->i_version++;
+
+       fat_detach(old_inode);
+       fat_attach(old_inode, new_i_pos);
+       if (is_hid)
+               MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
+       else
+               MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
+       if (IS_DIRSYNC(new_dir)) {
+               err = fat_sync_inode(old_inode);
+               if (err)
+                       goto error_inode;
+       } else
+               mark_inode_dirty(old_inode);
+
+       if (update_dotdot) {
+               int start = MSDOS_I(new_dir)->i_logstart;
+               dotdot_de->start = cpu_to_le16(start);
+               dotdot_de->starthi = cpu_to_le16(start >> 16);
+               mark_buffer_dirty(dotdot_bh);
+               if (IS_DIRSYNC(new_dir)) {
+                       err = sync_dirty_buffer(dotdot_bh);
+                       if (err)
+                               goto error_dotdot;
+               }
+               drop_nlink(old_dir);
+               if (!new_inode)
+                       inc_nlink(new_dir);
+       }
+
+       err = fat_remove_entries(old_dir, &old_sinfo);  /* and releases bh */
+       old_sinfo.bh = NULL;
+       if (err)
+               goto error_dotdot;
+       old_dir->i_version++;
+       old_dir->i_ctime = old_dir->i_mtime = ts;
+       if (IS_DIRSYNC(old_dir))
+               (void)fat_sync_inode(old_dir);
+       else
+               mark_inode_dirty(old_dir);
+
+       if (new_inode) {
+               drop_nlink(new_inode);
+               if (is_dir)
+                       drop_nlink(new_inode);
+               new_inode->i_ctime = ts;
+       }
+out:
+       brelse(sinfo.bh);
+       brelse(dotdot_bh);
+       brelse(old_sinfo.bh);
+       return err;
+
+error_dotdot:
+       /* data cluster is shared, serious corruption */
+       corrupt = 1;
+
+       if (update_dotdot) {
+               int start = MSDOS_I(old_dir)->i_logstart;
+               dotdot_de->start = cpu_to_le16(start);
+               dotdot_de->starthi = cpu_to_le16(start >> 16);
+               mark_buffer_dirty(dotdot_bh);
+               corrupt |= sync_dirty_buffer(dotdot_bh);
+       }
+error_inode:
+       fat_detach(old_inode);
+       fat_attach(old_inode, old_sinfo.i_pos);
+       MSDOS_I(old_inode)->i_attrs = old_attrs;
+       if (new_inode) {
+               fat_attach(new_inode, new_i_pos);
+               if (corrupt)
+                       corrupt |= fat_sync_inode(new_inode);
+       } else {
+               /*
+                * If new entry was not sharing the data cluster, it
+                * shouldn't be serious corruption.
+                */
+               int err2 = fat_remove_entries(new_dir, &sinfo);
+               if (corrupt)
+                       corrupt |= err2;
+               sinfo.bh = NULL;
+       }
+       if (corrupt < 0) {
+               fat_fs_panic(new_dir->i_sb,
+                            "%s: Filesystem corrupted (i_pos %lld)",
+                            __func__, sinfo.i_pos);
+       }
+       goto out;
+}
+
+/***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
+static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
+                       struct inode *new_dir, struct dentry *new_dentry)
+{
+       struct super_block *sb = old_dir->i_sb;
+       unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
+       int err, is_hid;
+
+       lock_super(sb);
+
+       err = msdos_format_name(old_dentry->d_name.name,
+                               old_dentry->d_name.len, old_msdos_name,
+                               &MSDOS_SB(old_dir->i_sb)->options);
+       if (err)
+               goto out;
+       err = msdos_format_name(new_dentry->d_name.name,
+                               new_dentry->d_name.len, new_msdos_name,
+                               &MSDOS_SB(new_dir->i_sb)->options);
+       if (err)
+               goto out;
+
+       is_hid =
+            (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.');
+
+       err = do_msdos_rename(old_dir, old_msdos_name, old_dentry,
+                             new_dir, new_msdos_name, new_dentry, is_hid);
+out:
+       unlock_super(sb);
+       if (!err)
+               err = fat_flush_inodes(sb, old_dir, new_dir);
+       return err;
+}
+
+static const struct inode_operations msdos_dir_inode_operations = {
+       .create         = msdos_create,
+       .lookup         = msdos_lookup,
+       .unlink         = msdos_unlink,
+       .mkdir          = msdos_mkdir,
+       .rmdir          = msdos_rmdir,
+       .rename         = msdos_rename,
+       .setattr        = fat_setattr,
+       .getattr        = fat_getattr,
+};
+
+static int msdos_fill_super(struct super_block *sb, void *data, int silent)
+{
+       int res;
+
+       res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0);
+       if (res)
+               return res;
+
+       sb->s_flags |= MS_NOATIME;
+       sb->s_root->d_op = &msdos_dentry_operations;
+       return 0;
+}
+
+static int msdos_get_sb(struct file_system_type *fs_type,
+                       int flags, const char *dev_name,
+                       void *data, struct vfsmount *mnt)
+{
+       return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super,
+                          mnt);
+}
+
+static struct file_system_type msdos_fs_type = {
+       .owner          = THIS_MODULE,
+       .name           = "msdos",
+       .get_sb         = msdos_get_sb,
+       .kill_sb        = kill_block_super,
+       .fs_flags       = FS_REQUIRES_DEV,
+};
+
+static int __init init_msdos_fs(void)
+{
+       return register_filesystem(&msdos_fs_type);
+}
+
+static void __exit exit_msdos_fs(void)
+{
+       unregister_filesystem(&msdos_fs_type);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Werner Almesberger");
+MODULE_DESCRIPTION("MS-DOS filesystem support");
+
+module_init(init_msdos_fs)
+module_exit(exit_msdos_fs)
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
new file mode 100644 (file)
index 0000000..155c10b
--- /dev/null
@@ -0,0 +1,1055 @@
+/*
+ *  linux/fs/vfat/namei.c
+ *
+ *  Written 1992,1993 by Werner Almesberger
+ *
+ *  Windows95/Windows NT compatible extended MSDOS filesystem
+ *    by Gordon Chaffee Copyright (C) 1995.  Send bug reports for the
+ *    VFAT filesystem to <chaffee@cs.berkeley.edu>.  Specify
+ *    what file operation caused you trouble and if you can duplicate
+ *    the problem, send a script that demonstrates it.
+ *
+ *  Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
+ *
+ *  Support Multibyte characters and cleanup by
+ *                             OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
+ */
+
+#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>
+
+static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+       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.
+                */
+               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);
+       }
+       return ret;
+}
+
+/* returns the length of a struct qstr, ignoring trailing dots */
+static unsigned int vfat_striptail_len(struct qstr *qstr)
+{
+       unsigned int len = qstr->len;
+
+       while (len && qstr->name[len - 1] == '.')
+               len--;
+       return len;
+}
+
+/*
+ * Compute the hash for the vfat name corresponding to the dentry.
+ * Note: if the name is invalid, we leave the hash code unchanged so
+ * that the existing dentry can be used. The vfat fs routines will
+ * return ENOENT or EINVAL as appropriate.
+ */
+static int vfat_hash(struct dentry *dentry, struct qstr *qstr)
+{
+       qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr));
+       return 0;
+}
+
+/*
+ * Compute the hash for the vfat name corresponding to the dentry.
+ * Note: if the name is invalid, we leave the hash code unchanged so
+ * that the existing dentry can be used. The vfat fs routines will
+ * return ENOENT or EINVAL as appropriate.
+ */
+static int vfat_hashi(struct dentry *dentry, struct qstr *qstr)
+{
+       struct nls_table *t = MSDOS_SB(dentry->d_inode->i_sb)->nls_io;
+       const unsigned char *name;
+       unsigned int len;
+       unsigned long hash;
+
+       name = qstr->name;
+       len = vfat_striptail_len(qstr);
+
+       hash = init_name_hash();
+       while (len--)
+               hash = partial_name_hash(nls_tolower(t, *name++), hash);
+       qstr->hash = end_name_hash(hash);
+
+       return 0;
+}
+
+/*
+ * Case insensitive compare of two vfat names.
+ */
+static int vfat_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b)
+{
+       struct nls_table *t = MSDOS_SB(dentry->d_inode->i_sb)->nls_io;
+       unsigned int alen, blen;
+
+       /* A filename cannot end in '.' or we treat it like it has none */
+       alen = vfat_striptail_len(a);
+       blen = vfat_striptail_len(b);
+       if (alen == blen) {
+               if (nls_strnicmp(t, a->name, b->name, alen) == 0)
+                       return 0;
+       }
+       return 1;
+}
+
+/*
+ * Case sensitive compare of two vfat names.
+ */
+static int vfat_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b)
+{
+       unsigned int alen, blen;
+
+       /* A filename cannot end in '.' or we treat it like it has none */
+       alen = vfat_striptail_len(a);
+       blen = vfat_striptail_len(b);
+       if (alen == blen) {
+               if (strncmp(a->name, b->name, alen) == 0)
+                       return 0;
+       }
+       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,
+       }
+};
+
+/* Characters that are undesirable in an MS-DOS file name */
+
+static inline wchar_t vfat_bad_char(wchar_t w)
+{
+       return (w < 0x0020)
+           || (w == '*') || (w == '?') || (w == '<') || (w == '>')
+           || (w == '|') || (w == '"') || (w == ':') || (w == '/')
+           || (w == '\\');
+}
+
+static inline wchar_t vfat_replace_char(wchar_t w)
+{
+       return (w == '[') || (w == ']') || (w == ';') || (w == ',')
+           || (w == '+') || (w == '=');
+}
+
+static wchar_t vfat_skip_char(wchar_t w)
+{
+       return (w == '.') || (w == ' ');
+}
+
+static inline int vfat_is_used_badchars(const wchar_t *s, int len)
+{
+       int i;
+
+       for (i = 0; i < len; i++)
+               if (vfat_bad_char(s[i]))
+                       return -EINVAL;
+
+       if (s[i - 1] == ' ') /* last character cannot be space */
+               return -EINVAL;
+
+       return 0;
+}
+
+static int vfat_find_form(struct inode *dir, unsigned char *name)
+{
+       struct fat_slot_info sinfo;
+       int err = fat_scan(dir, name, &sinfo);
+       if (err)
+               return -ENOENT;
+       brelse(sinfo.bh);
+       return 0;
+}
+
+/*
+ * 1) Valid characters for the 8.3 format alias are any combination of
+ * letters, uppercase alphabets, digits, any of the
+ * following special characters:
+ *     $ % ' ` - @ { } ~ ! # ( ) & _ ^
+ * In this case Longfilename is not stored in disk.
+ *
+ * WinNT's Extension:
+ * File name and extension name is contain uppercase/lowercase
+ * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT.
+ *
+ * 2) File name is 8.3 format, but it contain the uppercase and
+ * lowercase char, muliti bytes char, etc. In this case numtail is not
+ * added, but Longfilename is stored.
+ *
+ * 3) When the one except for the above, or the following special
+ * character are contained:
+ *        .   [ ] ; , + =
+ * numtail is added, and Longfilename must be stored in disk .
+ */
+struct shortname_info {
+       unsigned char lower:1,
+                     upper:1,
+                     valid:1;
+};
+#define INIT_SHORTNAME_INFO(x) do {            \
+       (x)->lower = 1;                         \
+       (x)->upper = 1;                         \
+       (x)->valid = 1;                         \
+} while (0)
+
+static inline int to_shortname_char(struct nls_table *nls,
+                                   unsigned char *buf, int buf_size,
+                                   wchar_t *src, struct shortname_info *info)
+{
+       int len;
+
+       if (vfat_skip_char(*src)) {
+               info->valid = 0;
+               return 0;
+       }
+       if (vfat_replace_char(*src)) {
+               info->valid = 0;
+               buf[0] = '_';
+               return 1;
+       }
+
+       len = nls->uni2char(*src, buf, buf_size);
+       if (len <= 0) {
+               info->valid = 0;
+               buf[0] = '_';
+               len = 1;
+       } else if (len == 1) {
+               unsigned char prev = buf[0];
+
+               if (buf[0] >= 0x7F) {
+                       info->lower = 0;
+                       info->upper = 0;
+               }
+
+               buf[0] = nls_toupper(nls, buf[0]);
+               if (isalpha(buf[0])) {
+                       if (buf[0] == prev)
+                               info->lower = 0;
+                       else
+                               info->upper = 0;
+               }
+       } else {
+               info->lower = 0;
+               info->upper = 0;
+       }
+
+       return len;
+}
+
+/*
+ * Given a valid longname, create a unique shortname.  Make sure the
+ * shortname does not exist
+ * Returns negative number on error, 0 for a normal
+ * return, and 1 for valid shortname
+ */
+static int vfat_create_shortname(struct inode *dir, struct nls_table *nls,
+                                wchar_t *uname, int ulen,
+                                unsigned char *name_res, unsigned char *lcase)
+{
+       struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options;
+       wchar_t *ip, *ext_start, *end, *name_start;
+       unsigned char base[9], ext[4], buf[8], *p;
+       unsigned char charbuf[NLS_MAX_CHARSET_SIZE];
+       int chl, chi;
+       int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen;
+       int is_shortname;
+       struct shortname_info base_info, ext_info;
+
+       is_shortname = 1;
+       INIT_SHORTNAME_INFO(&base_info);
+       INIT_SHORTNAME_INFO(&ext_info);
+
+       /* Now, we need to create a shortname from the long name */
+       ext_start = end = &uname[ulen];
+       while (--ext_start >= uname) {
+               if (*ext_start == 0x002E) {     /* is `.' */
+                       if (ext_start == end - 1) {
+                               sz = ulen;
+                               ext_start = NULL;
+                       }
+                       break;
+               }
+       }
+
+       if (ext_start == uname - 1) {
+               sz = ulen;
+               ext_start = NULL;
+       } else if (ext_start) {
+               /*
+                * Names which start with a dot could be just
+                * an extension eg. "...test".  In this case Win95
+                * uses the extension as the name and sets no extension.
+                */
+               name_start = &uname[0];
+               while (name_start < ext_start) {
+                       if (!vfat_skip_char(*name_start))
+                               break;
+                       name_start++;
+               }
+               if (name_start != ext_start) {
+                       sz = ext_start - uname;
+                       ext_start++;
+               } else {
+                       sz = ulen;
+                       ext_start = NULL;
+               }
+       }
+
+       numtail_baselen = 6;
+       numtail2_baselen = 2;
+       for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) {
+               chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
+                                       ip, &base_info);
+               if (chl == 0)
+                       continue;
+
+               if (baselen < 2 && (baselen + chl) > 2)
+                       numtail2_baselen = baselen;
+               if (baselen < 6 && (baselen + chl) > 6)
+                       numtail_baselen = baselen;
+               for (chi = 0; chi < chl; chi++) {
+                       *p++ = charbuf[chi];
+                       baselen++;
+                       if (baselen >= 8)
+                               break;
+               }
+               if (baselen >= 8) {
+                       if ((chi < chl - 1) || (ip + 1) - uname < sz)
+                               is_shortname = 0;
+                       break;
+               }
+       }
+       if (baselen == 0) {
+               return -EINVAL;
+       }
+
+       extlen = 0;
+       if (ext_start) {
+               for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) {
+                       chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
+                                               ip, &ext_info);
+                       if (chl == 0)
+                               continue;
+
+                       if ((extlen + chl) > 3) {
+                               is_shortname = 0;
+                               break;
+                       }
+                       for (chi = 0; chi < chl; chi++) {
+                               *p++ = charbuf[chi];
+                               extlen++;
+                       }
+                       if (extlen >= 3) {
+                               if (ip + 1 != end)
+                                       is_shortname = 0;
+                               break;
+                       }
+               }
+       }
+       ext[extlen] = '\0';
+       base[baselen] = '\0';
+
+       /* Yes, it can happen. ".\xe5" would do it. */
+       if (base[0] == DELETED_FLAG)
+               base[0] = 0x05;
+
+       /* OK, at this point we know that base is not longer than 8 symbols,
+        * ext is not longer than 3, base is nonempty, both don't contain
+        * any bad symbols (lowercase transformed to uppercase).
+        */
+
+       memset(name_res, ' ', MSDOS_NAME);
+       memcpy(name_res, base, baselen);
+       memcpy(name_res + 8, ext, extlen);
+       *lcase = 0;
+       if (is_shortname && base_info.valid && ext_info.valid) {
+               if (vfat_find_form(dir, name_res) == 0)
+                       return -EEXIST;
+
+               if (opts->shortname & VFAT_SFN_CREATE_WIN95) {
+                       return (base_info.upper && ext_info.upper);
+               } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) {
+                       if ((base_info.upper || base_info.lower) &&
+                           (ext_info.upper || ext_info.lower)) {
+                               if (!base_info.upper && base_info.lower)
+                                       *lcase |= CASE_LOWER_BASE;
+                               if (!ext_info.upper && ext_info.lower)
+                                       *lcase |= CASE_LOWER_EXT;
+                               return 1;
+                       }
+                       return 0;
+               } else {
+                       BUG();
+               }
+       }
+
+       if (opts->numtail == 0)
+               if (vfat_find_form(dir, name_res) < 0)
+                       return 0;
+
+       /*
+        * Try to find a unique extension.  This used to
+        * iterate through all possibilities sequentially,
+        * but that gave extremely bad performance.  Windows
+        * only tries a few cases before using random
+        * values for part of the base.
+        */
+
+       if (baselen > 6) {
+               baselen = numtail_baselen;
+               name_res[7] = ' ';
+       }
+       name_res[baselen] = '~';
+       for (i = 1; i < 10; i++) {
+               name_res[baselen + 1] = i + '0';
+               if (vfat_find_form(dir, name_res) < 0)
+                       return 0;
+       }
+
+       i = jiffies & 0xffff;
+       sz = (jiffies >> 16) & 0x7;
+       if (baselen > 2) {
+               baselen = numtail2_baselen;
+               name_res[7] = ' ';
+       }
+       name_res[baselen + 4] = '~';
+       name_res[baselen + 5] = '1' + sz;
+       while (1) {
+               sprintf(buf, "%04X", i);
+               memcpy(&name_res[baselen], buf, 4);
+               if (vfat_find_form(dir, name_res) < 0)
+                       break;
+               i -= 11;
+       }
+       return 0;
+}
+
+/* Translate a string, including coded sequences into Unicode */
+static int
+xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
+            int *longlen, int *outlen, int escape, int utf8,
+            struct nls_table *nls)
+{
+       const unsigned char *ip;
+       unsigned char nc;
+       unsigned char *op;
+       unsigned int ec;
+       int i, k, fill;
+       int charlen;
+
+       if (utf8) {
+               int name_len = strlen(name);
+
+               *outlen = utf8_mbstowcs((wchar_t *)outname, name, PATH_MAX);
+
+               /*
+                * We stripped '.'s before and set len appropriately,
+                * but utf8_mbstowcs doesn't care about len
+                */
+               *outlen -= (name_len - len);
+
+               if (*outlen > 255)
+                       return -ENAMETOOLONG;
+
+               op = &outname[*outlen * sizeof(wchar_t)];
+       } else {
+               if (nls) {
+                       for (i = 0, ip = name, op = outname, *outlen = 0;
+                            i < len && *outlen <= 255;
+                            *outlen += 1)
+                       {
+                               if (escape && (*ip == ':')) {
+                                       if (i > len - 5)
+                                               return -EINVAL;
+                                       ec = 0;
+                                       for (k = 1; k < 5; k++) {
+                                               nc = ip[k];
+                                               ec <<= 4;
+                                               if (nc >= '0' && nc <= '9') {
+                                                       ec |= nc - '0';
+                                                       continue;
+                                               }
+                                               if (nc >= 'a' && nc <= 'f') {
+                                                       ec |= nc - ('a' - 10);
+                                                       continue;
+                                               }
+                                               if (nc >= 'A' && nc <= 'F') {
+                                                       ec |= nc - ('A' - 10);
+                                                       continue;
+                                               }
+                                               return -EINVAL;
+                                       }
+                                       *op++ = ec & 0xFF;
+                                       *op++ = ec >> 8;
+                                       ip += 5;
+                                       i += 5;
+                               } else {
+                                       if ((charlen = nls->char2uni(ip, len - i, (wchar_t *)op)) < 0)
+                                               return -EINVAL;
+                                       ip += charlen;
+                                       i += charlen;
+                                       op += 2;
+                               }
+                       }
+                       if (i < len)
+                               return -ENAMETOOLONG;
+               } else {
+                       for (i = 0, ip = name, op = outname, *outlen = 0;
+                            i < len && *outlen <= 255;
+                            i++, *outlen += 1)
+                       {
+                               *op++ = *ip++;
+                               *op++ = 0;
+                       }
+                       if (i < len)
+                               return -ENAMETOOLONG;
+               }
+       }
+
+       *longlen = *outlen;
+       if (*outlen % 13) {
+               *op++ = 0;
+               *op++ = 0;
+               *outlen += 1;
+               if (*outlen % 13) {
+                       fill = 13 - (*outlen % 13);
+                       for (i = 0; i < fill; i++) {
+                               *op++ = 0xff;
+                               *op++ = 0xff;
+                       }
+                       *outlen += fill;
+               }
+       }
+
+       return 0;
+}
+
+static int vfat_build_slots(struct inode *dir, const unsigned char *name,
+                           int len, int is_dir, int cluster,
+                           struct timespec *ts,
+                           struct msdos_dir_slot *slots, int *nr_slots)
+{
+       struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
+       struct fat_mount_options *opts = &sbi->options;
+       struct msdos_dir_slot *ps;
+       struct msdos_dir_entry *de;
+       unsigned char cksum, lcase;
+       unsigned char msdos_name[MSDOS_NAME];
+       wchar_t *uname;
+       __le16 time, date;
+       int err, ulen, usize, i;
+       loff_t offset;
+
+       *nr_slots = 0;
+
+       uname = __getname();
+       if (!uname)
+               return -ENOMEM;
+
+       err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize,
+                          opts->unicode_xlate, opts->utf8, sbi->nls_io);
+       if (err)
+               goto out_free;
+
+       err = vfat_is_used_badchars(uname, ulen);
+       if (err)
+               goto out_free;
+
+       err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen,
+                                   msdos_name, &lcase);
+       if (err < 0)
+               goto out_free;
+       else if (err == 1) {
+               de = (struct msdos_dir_entry *)slots;
+               err = 0;
+               goto shortname;
+       }
+
+       /* build the entry of long file name */
+       cksum = fat_checksum(msdos_name);
+
+       *nr_slots = usize / 13;
+       for (ps = slots, i = *nr_slots; i > 0; i--, ps++) {
+               ps->id = i;
+               ps->attr = ATTR_EXT;
+               ps->reserved = 0;
+               ps->alias_checksum = cksum;
+               ps->start = 0;
+               offset = (i - 1) * 13;
+               fatwchar_to16(ps->name0_4, uname + offset, 5);
+               fatwchar_to16(ps->name5_10, uname + offset + 5, 6);
+               fatwchar_to16(ps->name11_12, uname + offset + 11, 2);
+       }
+       slots[0].id |= 0x40;
+       de = (struct msdos_dir_entry *)ps;
+
+shortname:
+       /* build the entry of 8.3 alias name */
+       (*nr_slots)++;
+       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);
+       de->time = de->ctime = time;
+       de->date = de->cdate = de->adate = date;
+       de->ctime_cs = 0;
+       de->start = cpu_to_le16(cluster);
+       de->starthi = cpu_to_le16(cluster >> 16);
+       de->size = 0;
+out_free:
+       __putname(uname);
+       return err;
+}
+
+static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir,
+                         int cluster, struct timespec *ts,
+                         struct fat_slot_info *sinfo)
+{
+       struct msdos_dir_slot *slots;
+       unsigned int len;
+       int err, nr_slots;
+
+       len = vfat_striptail_len(qname);
+       if (len == 0)
+               return -ENOENT;
+
+       slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS);
+       if (slots == NULL)
+               return -ENOMEM;
+
+       err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts,
+                              slots, &nr_slots);
+       if (err)
+               goto cleanup;
+
+       err = fat_add_entries(dir, slots, nr_slots, sinfo);
+       if (err)
+               goto cleanup;
+
+       /* update timestamp */
+       dir->i_ctime = dir->i_mtime = dir->i_atime = *ts;
+       if (IS_DIRSYNC(dir))
+               (void)fat_sync_inode(dir);
+       else
+               mark_inode_dirty(dir);
+cleanup:
+       kfree(slots);
+       return err;
+}
+
+static int vfat_find(struct inode *dir, struct qstr *qname,
+                    struct fat_slot_info *sinfo)
+{
+       unsigned int len = vfat_striptail_len(qname);
+       if (len == 0)
+               return -ENOENT;
+       return fat_search_long(dir, qname->name, len, sinfo);
+}
+
+static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
+                                 struct nameidata *nd)
+{
+       struct super_block *sb = dir->i_sb;
+       struct fat_slot_info sinfo;
+       struct inode *inode = NULL;
+       struct dentry *alias;
+       int err, table;
+
+       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++;
+               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);
+       }
+       alias = d_find_alias(inode);
+       if (alias) {
+               if (d_invalidate(alias) == 0)
+                       dput(alias);
+               else {
+                       iput(inode);
+                       unlock_super(sb);
+                       return alias;
+               }
+
+       }
+error:
+       unlock_super(sb);
+       dentry->d_op = &vfat_dentry_ops[table];
+       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_time = dentry->d_parent->d_inode->i_version;
+       }
+       return dentry;
+}
+
+static int vfat_create(struct inode *dir, struct dentry *dentry, int mode,
+                      struct nameidata *nd)
+{
+       struct super_block *sb = dir->i_sb;
+       struct inode *inode;
+       struct fat_slot_info sinfo;
+       struct timespec ts;
+       int err;
+
+       lock_super(sb);
+
+       ts = CURRENT_TIME_SEC;
+       err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo);
+       if (err)
+               goto out;
+       dir->i_version++;
+
+       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
+       brelse(sinfo.bh);
+       if (IS_ERR(inode)) {
+               err = PTR_ERR(inode);
+               goto out;
+       }
+       inode->i_version++;
+       inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+       /* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+       dentry->d_time = dentry->d_parent->d_inode->i_version;
+       d_instantiate(dentry, inode);
+out:
+       unlock_super(sb);
+       return err;
+}
+
+static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
+{
+       struct inode *inode = dentry->d_inode;
+       struct super_block *sb = dir->i_sb;
+       struct fat_slot_info sinfo;
+       int err;
+
+       lock_super(sb);
+
+       err = fat_dir_empty(inode);
+       if (err)
+               goto out;
+       err = vfat_find(dir, &dentry->d_name, &sinfo);
+       if (err)
+               goto out;
+
+       err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
+       if (err)
+               goto out;
+       drop_nlink(dir);
+
+       clear_nlink(inode);
+       inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
+       fat_detach(inode);
+out:
+       unlock_super(sb);
+
+       return err;
+}
+
+static int vfat_unlink(struct inode *dir, struct dentry *dentry)
+{
+       struct inode *inode = dentry->d_inode;
+       struct super_block *sb = dir->i_sb;
+       struct fat_slot_info sinfo;
+       int err;
+
+       lock_super(sb);
+
+       err = vfat_find(dir, &dentry->d_name, &sinfo);
+       if (err)
+               goto out;
+
+       err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
+       if (err)
+               goto out;
+       clear_nlink(inode);
+       inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
+       fat_detach(inode);
+out:
+       unlock_super(sb);
+
+       return err;
+}
+
+static int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+       struct super_block *sb = dir->i_sb;
+       struct inode *inode;
+       struct fat_slot_info sinfo;
+       struct timespec ts;
+       int err, cluster;
+
+       lock_super(sb);
+
+       ts = CURRENT_TIME_SEC;
+       cluster = fat_alloc_new_dir(dir, &ts);
+       if (cluster < 0) {
+               err = cluster;
+               goto out;
+       }
+       err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo);
+       if (err)
+               goto out_free;
+       dir->i_version++;
+       inc_nlink(dir);
+
+       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
+       brelse(sinfo.bh);
+       if (IS_ERR(inode)) {
+               err = PTR_ERR(inode);
+               /* the directory was completed, just return a error */
+               goto out;
+       }
+       inode->i_version++;
+       inode->i_nlink = 2;
+       inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+       /* timestamp is already written, so mark_inode_dirty() is unneeded. */
+
+       dentry->d_time = dentry->d_parent->d_inode->i_version;
+       d_instantiate(dentry, inode);
+
+       unlock_super(sb);
+       return 0;
+
+out_free:
+       fat_free_clusters(dir, cluster);
+out:
+       unlock_super(sb);
+       return err;
+}
+
+static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
+                      struct inode *new_dir, struct dentry *new_dentry)
+{
+       struct buffer_head *dotdot_bh;
+       struct msdos_dir_entry *dotdot_de;
+       struct inode *old_inode, *new_inode;
+       struct fat_slot_info old_sinfo, sinfo;
+       struct timespec ts;
+       loff_t dotdot_i_pos, new_i_pos;
+       int err, is_dir, update_dotdot, corrupt = 0;
+       struct super_block *sb = old_dir->i_sb;
+
+       old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
+       old_inode = old_dentry->d_inode;
+       new_inode = new_dentry->d_inode;
+       lock_super(sb);
+       err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo);
+       if (err)
+               goto out;
+
+       is_dir = S_ISDIR(old_inode->i_mode);
+       update_dotdot = (is_dir && old_dir != new_dir);
+       if (update_dotdot) {
+               if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
+                                        &dotdot_i_pos) < 0) {
+                       err = -EIO;
+                       goto out;
+               }
+       }
+
+       ts = CURRENT_TIME_SEC;
+       if (new_inode) {
+               if (is_dir) {
+                       err = fat_dir_empty(new_inode);
+                       if (err)
+                               goto out;
+               }
+               new_i_pos = MSDOS_I(new_inode)->i_pos;
+               fat_detach(new_inode);
+       } else {
+               err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0,
+                                    &ts, &sinfo);
+               if (err)
+                       goto out;
+               new_i_pos = sinfo.i_pos;
+       }
+       new_dir->i_version++;
+
+       fat_detach(old_inode);
+       fat_attach(old_inode, new_i_pos);
+       if (IS_DIRSYNC(new_dir)) {
+               err = fat_sync_inode(old_inode);
+               if (err)
+                       goto error_inode;
+       } else
+               mark_inode_dirty(old_inode);
+
+       if (update_dotdot) {
+               int start = MSDOS_I(new_dir)->i_logstart;
+               dotdot_de->start = cpu_to_le16(start);
+               dotdot_de->starthi = cpu_to_le16(start >> 16);
+               mark_buffer_dirty(dotdot_bh);
+               if (IS_DIRSYNC(new_dir)) {
+                       err = sync_dirty_buffer(dotdot_bh);
+                       if (err)
+                               goto error_dotdot;
+               }
+               drop_nlink(old_dir);
+               if (!new_inode)
+                       inc_nlink(new_dir);
+       }
+
+       err = fat_remove_entries(old_dir, &old_sinfo);  /* and releases bh */
+       old_sinfo.bh = NULL;
+       if (err)
+               goto error_dotdot;
+       old_dir->i_version++;
+       old_dir->i_ctime = old_dir->i_mtime = ts;
+       if (IS_DIRSYNC(old_dir))
+               (void)fat_sync_inode(old_dir);
+       else
+               mark_inode_dirty(old_dir);
+
+       if (new_inode) {
+               drop_nlink(new_inode);
+               if (is_dir)
+                       drop_nlink(new_inode);
+               new_inode->i_ctime = ts;
+       }
+out:
+       brelse(sinfo.bh);
+       brelse(dotdot_bh);
+       brelse(old_sinfo.bh);
+       unlock_super(sb);
+
+       return err;
+
+error_dotdot:
+       /* data cluster is shared, serious corruption */
+       corrupt = 1;
+
+       if (update_dotdot) {
+               int start = MSDOS_I(old_dir)->i_logstart;
+               dotdot_de->start = cpu_to_le16(start);
+               dotdot_de->starthi = cpu_to_le16(start >> 16);
+               mark_buffer_dirty(dotdot_bh);
+               corrupt |= sync_dirty_buffer(dotdot_bh);
+       }
+error_inode:
+       fat_detach(old_inode);
+       fat_attach(old_inode, old_sinfo.i_pos);
+       if (new_inode) {
+               fat_attach(new_inode, new_i_pos);
+               if (corrupt)
+                       corrupt |= fat_sync_inode(new_inode);
+       } else {
+               /*
+                * If new entry was not sharing the data cluster, it
+                * shouldn't be serious corruption.
+                */
+               int err2 = fat_remove_entries(new_dir, &sinfo);
+               if (corrupt)
+                       corrupt |= err2;
+               sinfo.bh = NULL;
+       }
+       if (corrupt < 0) {
+               fat_fs_panic(new_dir->i_sb,
+                            "%s: Filesystem corrupted (i_pos %lld)",
+                            __func__, sinfo.i_pos);
+       }
+       goto out;
+}
+
+static const struct inode_operations vfat_dir_inode_operations = {
+       .create         = vfat_create,
+       .lookup         = vfat_lookup,
+       .unlink         = vfat_unlink,
+       .mkdir          = vfat_mkdir,
+       .rmdir          = vfat_rmdir,
+       .rename         = vfat_rename,
+       .setattr        = fat_setattr,
+       .getattr        = fat_getattr,
+};
+
+static int vfat_fill_super(struct super_block *sb, void *data, int silent)
+{
+       int res;
+
+       res = fat_fill_super(sb, data, silent, &vfat_dir_inode_operations, 1);
+       if (res)
+               return res;
+
+       if (MSDOS_SB(sb)->options.name_check != 's')
+               sb->s_root->d_op = &vfat_dentry_ops[0];
+       else
+               sb->s_root->d_op = &vfat_dentry_ops[2];
+
+       return 0;
+}
+
+static int vfat_get_sb(struct file_system_type *fs_type,
+                      int flags, const char *dev_name,
+                      void *data, struct vfsmount *mnt)
+{
+       return get_sb_bdev(fs_type, flags, dev_name, data, vfat_fill_super,
+                          mnt);
+}
+
+static struct file_system_type vfat_fs_type = {
+       .owner          = THIS_MODULE,
+       .name           = "vfat",
+       .get_sb         = vfat_get_sb,
+       .kill_sb        = kill_block_super,
+       .fs_flags       = FS_REQUIRES_DEV,
+};
+
+static int __init init_vfat_fs(void)
+{
+       return register_filesystem(&vfat_fs_type);
+}
+
+static void __exit exit_vfat_fs(void)
+{
+       unregister_filesystem(&vfat_fs_type);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("VFAT filesystem support");
+MODULE_AUTHOR("Gordon Chaffee");
+
+module_init(init_vfat_fs)
+module_exit(exit_vfat_fs)
diff --git a/fs/msdos/Makefile b/fs/msdos/Makefile
deleted file mode 100644 (file)
index ea67646..0000000
+++ /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/msdos/namei.c b/fs/msdos/namei.c
deleted file mode 100644 (file)
index e844b98..0000000
+++ /dev/null
@@ -1,702 +0,0 @@
-/*
- *  linux/fs/msdos/namei.c
- *
- *  Written 1992,1993 by Werner Almesberger
- *  Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
- *  Rewritten for constant inumbers 1999 by Al Viro
- */
-
-#include <linux/module.h>
-#include <linux/time.h>
-#include <linux/buffer_head.h>
-#include <linux/msdos_fs.h>
-#include <linux/smp_lock.h>
-
-/* Characters that are undesirable in an MS-DOS file name */
-static unsigned char bad_chars[] = "*?<>|\"";
-static unsigned char bad_if_strict[] = "+=,; ";
-
-/***** Formats an MS-DOS file name. Rejects invalid names. */
-static int msdos_format_name(const unsigned char *name, int len,
-                            unsigned char *res, struct fat_mount_options *opts)
-       /*
-        * name is the proposed name, len is its length, res is
-        * the resulting name, opts->name_check is either (r)elaxed,
-        * (n)ormal or (s)trict, opts->dotsOK allows dots at the
-        * beginning of name (for hidden files)
-        */
-{
-       unsigned char *walk;
-       unsigned char c;
-       int space;
-
-       if (name[0] == '.') {   /* dotfile because . and .. already done */
-               if (opts->dotsOK) {
-                       /* Get rid of dot - test for it elsewhere */
-                       name++;
-                       len--;
-               } else
-                       return -EINVAL;
-       }
-       /*
-        * disallow names that _really_ start with a dot
-        */
-       space = 1;
-       c = 0;
-       for (walk = res; len && walk - res < 8; walk++) {
-               c = *name++;
-               len--;
-               if (opts->name_check != 'r' && strchr(bad_chars, c))
-                       return -EINVAL;
-               if (opts->name_check == 's' && strchr(bad_if_strict, c))
-                       return -EINVAL;
-               if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
-                       return -EINVAL;
-               if (c < ' ' || c == ':' || c == '\\')
-                       return -EINVAL;
-       /*
-        * 0xE5 is legal as a first character, but we must substitute
-        * 0x05 because 0xE5 marks deleted files.  Yes, DOS really
-        * does this.
-        * It seems that Microsoft hacked DOS to support non-US
-        * characters after the 0xE5 character was already in use to
-        * mark deleted files.
-        */
-               if ((res == walk) && (c == 0xE5))
-                       c = 0x05;
-               if (c == '.')
-                       break;
-               space = (c == ' ');
-               *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c;
-       }
-       if (space)
-               return -EINVAL;
-       if (opts->name_check == 's' && len && c != '.') {
-               c = *name++;
-               len--;
-               if (c != '.')
-                       return -EINVAL;
-       }
-       while (c != '.' && len--)
-               c = *name++;
-       if (c == '.') {
-               while (walk - res < 8)
-                       *walk++ = ' ';
-               while (len > 0 && walk - res < MSDOS_NAME) {
-                       c = *name++;
-                       len--;
-                       if (opts->name_check != 'r' && strchr(bad_chars, c))
-                               return -EINVAL;
-                       if (opts->name_check == 's' &&
-                           strchr(bad_if_strict, c))
-                               return -EINVAL;
-                       if (c < ' ' || c == ':' || c == '\\')
-                               return -EINVAL;
-                       if (c == '.') {
-                               if (opts->name_check == 's')
-                                       return -EINVAL;
-                               break;
-                       }
-                       if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
-                               return -EINVAL;
-                       space = c == ' ';
-                       if (!opts->nocase && c >= 'a' && c <= 'z')
-                               *walk++ = c - 32;
-                       else
-                               *walk++ = c;
-               }
-               if (space)
-                       return -EINVAL;
-               if (opts->name_check == 's' && len)
-                       return -EINVAL;
-       }
-       while (walk - res < MSDOS_NAME)
-               *walk++ = ' ';
-
-       return 0;
-}
-
-/***** Locates a directory entry.  Uses unformatted name. */
-static int msdos_find(struct inode *dir, const unsigned char *name, int len,
-                     struct fat_slot_info *sinfo)
-{
-       struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
-       unsigned char msdos_name[MSDOS_NAME];
-       int err;
-
-       err = msdos_format_name(name, len, msdos_name, &sbi->options);
-       if (err)
-               return -ENOENT;
-
-       err = fat_scan(dir, msdos_name, sinfo);
-       if (!err && sbi->options.dotsOK) {
-               if (name[0] == '.') {
-                       if (!(sinfo->de->attr & ATTR_HIDDEN))
-                               err = -ENOENT;
-               } else {
-                       if (sinfo->de->attr & ATTR_HIDDEN)
-                               err = -ENOENT;
-               }
-               if (err)
-                       brelse(sinfo->bh);
-       }
-       return err;
-}
-
-/*
- * Compute the hash for the msdos name corresponding to the dentry.
- * Note: if the name is invalid, we leave the hash code unchanged so
- * that the existing dentry can be used. The msdos fs routines will
- * return ENOENT or EINVAL as appropriate.
- */
-static int msdos_hash(struct dentry *dentry, struct qstr *qstr)
-{
-       struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
-       unsigned char msdos_name[MSDOS_NAME];
-       int error;
-
-       error = msdos_format_name(qstr->name, qstr->len, msdos_name, options);
-       if (!error)
-               qstr->hash = full_name_hash(msdos_name, MSDOS_NAME);
-       return 0;
-}
-
-/*
- * Compare two msdos names. If either of the names are invalid,
- * we fall back to doing the standard name comparison.
- */
-static int msdos_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b)
-{
-       struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
-       unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME];
-       int error;
-
-       error = msdos_format_name(a->name, a->len, a_msdos_name, options);
-       if (error)
-               goto old_compare;
-       error = msdos_format_name(b->name, b->len, b_msdos_name, options);
-       if (error)
-               goto old_compare;
-       error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME);
-out:
-       return error;
-
-old_compare:
-       error = 1;
-       if (a->len == b->len)
-               error = memcmp(a->name, b->name, a->len);
-       goto out;
-}
-
-static struct dentry_operations msdos_dentry_operations = {
-       .d_hash         = msdos_hash,
-       .d_compare      = msdos_cmp,
-};
-
-/*
- * AV. Wrappers for FAT sb operations. Is it wise?
- */
-
-/***** Get inode using directory and name */
-static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
-                                  struct nameidata *nd)
-{
-       struct super_block *sb = dir->i_sb;
-       struct fat_slot_info sinfo;
-       struct inode *inode = NULL;
-       int res;
-
-       dentry->d_op = &msdos_dentry_operations;
-
-       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;
-       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
-       brelse(sinfo.bh);
-       if (IS_ERR(inode)) {
-               res = PTR_ERR(inode);
-               goto out;
-       }
-add:
-       res = 0;
-       dentry = d_splice_alias(inode, dentry);
-       if (dentry)
-               dentry->d_op = &msdos_dentry_operations;
-out:
-       unlock_super(sb);
-       if (!res)
-               return dentry;
-       return ERR_PTR(res);
-}
-
-/***** Creates a directory entry (name is already formatted). */
-static int msdos_add_entry(struct inode *dir, const unsigned char *name,
-                          int is_dir, int is_hid, int cluster,
-                          struct timespec *ts, struct fat_slot_info *sinfo)
-{
-       struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
-       struct msdos_dir_entry de;
-       __le16 time, date;
-       int err;
-
-       memcpy(de.name, name, MSDOS_NAME);
-       de.attr = is_dir ? ATTR_DIR : ATTR_ARCH;
-       if (is_hid)
-               de.attr |= ATTR_HIDDEN;
-       de.lcase = 0;
-       fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
-       de.cdate = de.adate = 0;
-       de.ctime = 0;
-       de.ctime_cs = 0;
-       de.time = time;
-       de.date = date;
-       de.start = cpu_to_le16(cluster);
-       de.starthi = cpu_to_le16(cluster >> 16);
-       de.size = 0;
-
-       err = fat_add_entries(dir, &de, 1, sinfo);
-       if (err)
-               return err;
-
-       dir->i_ctime = dir->i_mtime = *ts;
-       if (IS_DIRSYNC(dir))
-               (void)fat_sync_inode(dir);
-       else
-               mark_inode_dirty(dir);
-
-       return 0;
-}
-
-/***** Create a file */
-static int msdos_create(struct inode *dir, struct dentry *dentry, int mode,
-                       struct nameidata *nd)
-{
-       struct super_block *sb = dir->i_sb;
-       struct inode *inode = NULL;
-       struct fat_slot_info sinfo;
-       struct timespec ts;
-       unsigned char msdos_name[MSDOS_NAME];
-       int err, is_hid;
-
-       lock_super(sb);
-
-       err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
-                               msdos_name, &MSDOS_SB(sb)->options);
-       if (err)
-               goto out;
-       is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
-       /* Have to do it due to foo vs. .foo conflicts */
-       if (!fat_scan(dir, msdos_name, &sinfo)) {
-               brelse(sinfo.bh);
-               err = -EINVAL;
-               goto out;
-       }
-
-       ts = CURRENT_TIME_SEC;
-       err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo);
-       if (err)
-               goto out;
-       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
-       brelse(sinfo.bh);
-       if (IS_ERR(inode)) {
-               err = PTR_ERR(inode);
-               goto out;
-       }
-       inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
-       /* timestamp is already written, so mark_inode_dirty() is unneeded. */
-
-       d_instantiate(dentry, inode);
-out:
-       unlock_super(sb);
-       if (!err)
-               err = fat_flush_inodes(sb, dir, inode);
-       return err;
-}
-
-/***** Remove a directory */
-static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
-{
-       struct super_block *sb = dir->i_sb;
-       struct inode *inode = dentry->d_inode;
-       struct fat_slot_info sinfo;
-       int err;
-
-       lock_super(sb);
-       /*
-        * Check whether the directory is not in use, then check
-        * whether it is empty.
-        */
-       err = fat_dir_empty(inode);
-       if (err)
-               goto out;
-       err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
-       if (err)
-               goto out;
-
-       err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
-       if (err)
-               goto out;
-       drop_nlink(dir);
-
-       clear_nlink(inode);
-       inode->i_ctime = CURRENT_TIME_SEC;
-       fat_detach(inode);
-out:
-       unlock_super(sb);
-       if (!err)
-               err = fat_flush_inodes(sb, dir, inode);
-
-       return err;
-}
-
-/***** Make a directory */
-static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
-       struct super_block *sb = dir->i_sb;
-       struct fat_slot_info sinfo;
-       struct inode *inode;
-       unsigned char msdos_name[MSDOS_NAME];
-       struct timespec ts;
-       int err, is_hid, cluster;
-
-       lock_super(sb);
-
-       err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
-                               msdos_name, &MSDOS_SB(sb)->options);
-       if (err)
-               goto out;
-       is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
-       /* foo vs .foo situation */
-       if (!fat_scan(dir, msdos_name, &sinfo)) {
-               brelse(sinfo.bh);
-               err = -EINVAL;
-               goto out;
-       }
-
-       ts = CURRENT_TIME_SEC;
-       cluster = fat_alloc_new_dir(dir, &ts);
-       if (cluster < 0) {
-               err = cluster;
-               goto out;
-       }
-       err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo);
-       if (err)
-               goto out_free;
-       inc_nlink(dir);
-
-       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
-       brelse(sinfo.bh);
-       if (IS_ERR(inode)) {
-               err = PTR_ERR(inode);
-               /* the directory was completed, just return a error */
-               goto out;
-       }
-       inode->i_nlink = 2;
-       inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
-       /* timestamp is already written, so mark_inode_dirty() is unneeded. */
-
-       d_instantiate(dentry, inode);
-
-       unlock_super(sb);
-       fat_flush_inodes(sb, dir, inode);
-       return 0;
-
-out_free:
-       fat_free_clusters(dir, cluster);
-out:
-       unlock_super(sb);
-       return err;
-}
-
-/***** Unlink a file */
-static int msdos_unlink(struct inode *dir, struct dentry *dentry)
-{
-       struct inode *inode = dentry->d_inode;
-       struct super_block *sb= inode->i_sb;
-       struct fat_slot_info sinfo;
-       int err;
-
-       lock_super(sb);
-       err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
-       if (err)
-               goto out;
-
-       err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
-       if (err)
-               goto out;
-       clear_nlink(inode);
-       inode->i_ctime = CURRENT_TIME_SEC;
-       fat_detach(inode);
-out:
-       unlock_super(sb);
-       if (!err)
-               err = fat_flush_inodes(sb, dir, inode);
-
-       return err;
-}
-
-static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
-                          struct dentry *old_dentry,
-                          struct inode *new_dir, unsigned char *new_name,
-                          struct dentry *new_dentry, int is_hid)
-{
-       struct buffer_head *dotdot_bh;
-       struct msdos_dir_entry *dotdot_de;
-       struct inode *old_inode, *new_inode;
-       struct fat_slot_info old_sinfo, sinfo;
-       struct timespec ts;
-       loff_t dotdot_i_pos, new_i_pos;
-       int err, old_attrs, is_dir, update_dotdot, corrupt = 0;
-
-       old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
-       old_inode = old_dentry->d_inode;
-       new_inode = new_dentry->d_inode;
-
-       err = fat_scan(old_dir, old_name, &old_sinfo);
-       if (err) {
-               err = -EIO;
-               goto out;
-       }
-
-       is_dir = S_ISDIR(old_inode->i_mode);
-       update_dotdot = (is_dir && old_dir != new_dir);
-       if (update_dotdot) {
-               if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
-                                        &dotdot_i_pos) < 0) {
-                       err = -EIO;
-                       goto out;
-               }
-       }
-
-       old_attrs = MSDOS_I(old_inode)->i_attrs;
-       err = fat_scan(new_dir, new_name, &sinfo);
-       if (!err) {
-               if (!new_inode) {
-                       /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */
-                       if (sinfo.de != old_sinfo.de) {
-                               err = -EINVAL;
-                               goto out;
-                       }
-                       if (is_hid)
-                               MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
-                       else
-                               MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
-                       if (IS_DIRSYNC(old_dir)) {
-                               err = fat_sync_inode(old_inode);
-                               if (err) {
-                                       MSDOS_I(old_inode)->i_attrs = old_attrs;
-                                       goto out;
-                               }
-                       } else
-                               mark_inode_dirty(old_inode);
-
-                       old_dir->i_version++;
-                       old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
-                       if (IS_DIRSYNC(old_dir))
-                               (void)fat_sync_inode(old_dir);
-                       else
-                               mark_inode_dirty(old_dir);
-                       goto out;
-               }
-       }
-
-       ts = CURRENT_TIME_SEC;
-       if (new_inode) {
-               if (err)
-                       goto out;
-               if (is_dir) {
-                       err = fat_dir_empty(new_inode);
-                       if (err)
-                               goto out;
-               }
-               new_i_pos = MSDOS_I(new_inode)->i_pos;
-               fat_detach(new_inode);
-       } else {
-               err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0,
-                                     &ts, &sinfo);
-               if (err)
-                       goto out;
-               new_i_pos = sinfo.i_pos;
-       }
-       new_dir->i_version++;
-
-       fat_detach(old_inode);
-       fat_attach(old_inode, new_i_pos);
-       if (is_hid)
-               MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
-       else
-               MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
-       if (IS_DIRSYNC(new_dir)) {
-               err = fat_sync_inode(old_inode);
-               if (err)
-                       goto error_inode;
-       } else
-               mark_inode_dirty(old_inode);
-
-       if (update_dotdot) {
-               int start = MSDOS_I(new_dir)->i_logstart;
-               dotdot_de->start = cpu_to_le16(start);
-               dotdot_de->starthi = cpu_to_le16(start >> 16);
-               mark_buffer_dirty(dotdot_bh);
-               if (IS_DIRSYNC(new_dir)) {
-                       err = sync_dirty_buffer(dotdot_bh);
-                       if (err)
-                               goto error_dotdot;
-               }
-               drop_nlink(old_dir);
-               if (!new_inode)
-                       inc_nlink(new_dir);
-       }
-
-       err = fat_remove_entries(old_dir, &old_sinfo);  /* and releases bh */
-       old_sinfo.bh = NULL;
-       if (err)
-               goto error_dotdot;
-       old_dir->i_version++;
-       old_dir->i_ctime = old_dir->i_mtime = ts;
-       if (IS_DIRSYNC(old_dir))
-               (void)fat_sync_inode(old_dir);
-       else
-               mark_inode_dirty(old_dir);
-
-       if (new_inode) {
-               drop_nlink(new_inode);
-               if (is_dir)
-                       drop_nlink(new_inode);
-               new_inode->i_ctime = ts;
-       }
-out:
-       brelse(sinfo.bh);
-       brelse(dotdot_bh);
-       brelse(old_sinfo.bh);
-       return err;
-
-error_dotdot:
-       /* data cluster is shared, serious corruption */
-       corrupt = 1;
-
-       if (update_dotdot) {
-               int start = MSDOS_I(old_dir)->i_logstart;
-               dotdot_de->start = cpu_to_le16(start);
-               dotdot_de->starthi = cpu_to_le16(start >> 16);
-               mark_buffer_dirty(dotdot_bh);
-               corrupt |= sync_dirty_buffer(dotdot_bh);
-       }
-error_inode:
-       fat_detach(old_inode);
-       fat_attach(old_inode, old_sinfo.i_pos);
-       MSDOS_I(old_inode)->i_attrs = old_attrs;
-       if (new_inode) {
-               fat_attach(new_inode, new_i_pos);
-               if (corrupt)
-                       corrupt |= fat_sync_inode(new_inode);
-       } else {
-               /*
-                * If new entry was not sharing the data cluster, it
-                * shouldn't be serious corruption.
-                */
-               int err2 = fat_remove_entries(new_dir, &sinfo);
-               if (corrupt)
-                       corrupt |= err2;
-               sinfo.bh = NULL;
-       }
-       if (corrupt < 0) {
-               fat_fs_panic(new_dir->i_sb,
-                            "%s: Filesystem corrupted (i_pos %lld)",
-                            __func__, sinfo.i_pos);
-       }
-       goto out;
-}
-
-/***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
-static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
-                       struct inode *new_dir, struct dentry *new_dentry)
-{
-       struct super_block *sb = old_dir->i_sb;
-       unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
-       int err, is_hid;
-
-       lock_super(sb);
-
-       err = msdos_format_name(old_dentry->d_name.name,
-                               old_dentry->d_name.len, old_msdos_name,
-                               &MSDOS_SB(old_dir->i_sb)->options);
-       if (err)
-               goto out;
-       err = msdos_format_name(new_dentry->d_name.name,
-                               new_dentry->d_name.len, new_msdos_name,
-                               &MSDOS_SB(new_dir->i_sb)->options);
-       if (err)
-               goto out;
-
-       is_hid =
-            (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.');
-
-       err = do_msdos_rename(old_dir, old_msdos_name, old_dentry,
-                             new_dir, new_msdos_name, new_dentry, is_hid);
-out:
-       unlock_super(sb);
-       if (!err)
-               err = fat_flush_inodes(sb, old_dir, new_dir);
-       return err;
-}
-
-static const struct inode_operations msdos_dir_inode_operations = {
-       .create         = msdos_create,
-       .lookup         = msdos_lookup,
-       .unlink         = msdos_unlink,
-       .mkdir          = msdos_mkdir,
-       .rmdir          = msdos_rmdir,
-       .rename         = msdos_rename,
-       .setattr        = fat_setattr,
-       .getattr        = fat_getattr,
-};
-
-static int msdos_fill_super(struct super_block *sb, void *data, int silent)
-{
-       int res;
-
-       res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0);
-       if (res)
-               return res;
-
-       sb->s_flags |= MS_NOATIME;
-       sb->s_root->d_op = &msdos_dentry_operations;
-       return 0;
-}
-
-static int msdos_get_sb(struct file_system_type *fs_type,
-                       int flags, const char *dev_name,
-                       void *data, struct vfsmount *mnt)
-{
-       return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super,
-                          mnt);
-}
-
-static struct file_system_type msdos_fs_type = {
-       .owner          = THIS_MODULE,
-       .name           = "msdos",
-       .get_sb         = msdos_get_sb,
-       .kill_sb        = kill_block_super,
-       .fs_flags       = FS_REQUIRES_DEV,
-};
-
-static int __init init_msdos_fs(void)
-{
-       return register_filesystem(&msdos_fs_type);
-}
-
-static void __exit exit_msdos_fs(void)
-{
-       unregister_filesystem(&msdos_fs_type);
-}
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Werner Almesberger");
-MODULE_DESCRIPTION("MS-DOS filesystem support");
-
-module_init(init_msdos_fs)
-module_exit(exit_msdos_fs)
diff --git a/fs/vfat/Makefile b/fs/vfat/Makefile
deleted file mode 100644 (file)
index 40f2798..0000000
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Makefile for the linux vfat-filesystem routines.
-#
-
-obj-$(CONFIG_VFAT_FS) += vfat.o
-
-vfat-y := namei.o
diff --git a/fs/vfat/namei.c b/fs/vfat/namei.c
deleted file mode 100644 (file)
index 155c10b..0000000
+++ /dev/null
@@ -1,1055 +0,0 @@
-/*
- *  linux/fs/vfat/namei.c
- *
- *  Written 1992,1993 by Werner Almesberger
- *
- *  Windows95/Windows NT compatible extended MSDOS filesystem
- *    by Gordon Chaffee Copyright (C) 1995.  Send bug reports for the
- *    VFAT filesystem to <chaffee@cs.berkeley.edu>.  Specify
- *    what file operation caused you trouble and if you can duplicate
- *    the problem, send a script that demonstrates it.
- *
- *  Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
- *
- *  Support Multibyte characters and cleanup by
- *                             OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
- */
-
-#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>
-
-static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
-{
-       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.
-                */
-               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);
-       }
-       return ret;
-}
-
-/* returns the length of a struct qstr, ignoring trailing dots */
-static unsigned int vfat_striptail_len(struct qstr *qstr)
-{
-       unsigned int len = qstr->len;
-
-       while (len && qstr->name[len - 1] == '.')
-               len--;
-       return len;
-}
-
-/*
- * Compute the hash for the vfat name corresponding to the dentry.
- * Note: if the name is invalid, we leave the hash code unchanged so
- * that the existing dentry can be used. The vfat fs routines will
- * return ENOENT or EINVAL as appropriate.
- */
-static int vfat_hash(struct dentry *dentry, struct qstr *qstr)
-{
-       qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr));
-       return 0;
-}
-
-/*
- * Compute the hash for the vfat name corresponding to the dentry.
- * Note: if the name is invalid, we leave the hash code unchanged so
- * that the existing dentry can be used. The vfat fs routines will
- * return ENOENT or EINVAL as appropriate.
- */
-static int vfat_hashi(struct dentry *dentry, struct qstr *qstr)
-{
-       struct nls_table *t = MSDOS_SB(dentry->d_inode->i_sb)->nls_io;
-       const unsigned char *name;
-       unsigned int len;
-       unsigned long hash;
-
-       name = qstr->name;
-       len = vfat_striptail_len(qstr);
-
-       hash = init_name_hash();
-       while (len--)
-               hash = partial_name_hash(nls_tolower(t, *name++), hash);
-       qstr->hash = end_name_hash(hash);
-
-       return 0;
-}
-
-/*
- * Case insensitive compare of two vfat names.
- */
-static int vfat_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b)
-{
-       struct nls_table *t = MSDOS_SB(dentry->d_inode->i_sb)->nls_io;
-       unsigned int alen, blen;
-
-       /* A filename cannot end in '.' or we treat it like it has none */
-       alen = vfat_striptail_len(a);
-       blen = vfat_striptail_len(b);
-       if (alen == blen) {
-               if (nls_strnicmp(t, a->name, b->name, alen) == 0)
-                       return 0;
-       }
-       return 1;
-}
-
-/*
- * Case sensitive compare of two vfat names.
- */
-static int vfat_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b)
-{
-       unsigned int alen, blen;
-
-       /* A filename cannot end in '.' or we treat it like it has none */
-       alen = vfat_striptail_len(a);
-       blen = vfat_striptail_len(b);
-       if (alen == blen) {
-               if (strncmp(a->name, b->name, alen) == 0)
-                       return 0;
-       }
-       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,
-       }
-};
-
-/* Characters that are undesirable in an MS-DOS file name */
-
-static inline wchar_t vfat_bad_char(wchar_t w)
-{
-       return (w < 0x0020)
-           || (w == '*') || (w == '?') || (w == '<') || (w == '>')
-           || (w == '|') || (w == '"') || (w == ':') || (w == '/')
-           || (w == '\\');
-}
-
-static inline wchar_t vfat_replace_char(wchar_t w)
-{
-       return (w == '[') || (w == ']') || (w == ';') || (w == ',')
-           || (w == '+') || (w == '=');
-}
-
-static wchar_t vfat_skip_char(wchar_t w)
-{
-       return (w == '.') || (w == ' ');
-}
-
-static inline int vfat_is_used_badchars(const wchar_t *s, int len)
-{
-       int i;
-
-       for (i = 0; i < len; i++)
-               if (vfat_bad_char(s[i]))
-                       return -EINVAL;
-
-       if (s[i - 1] == ' ') /* last character cannot be space */
-               return -EINVAL;
-
-       return 0;
-}
-
-static int vfat_find_form(struct inode *dir, unsigned char *name)
-{
-       struct fat_slot_info sinfo;
-       int err = fat_scan(dir, name, &sinfo);
-       if (err)
-               return -ENOENT;
-       brelse(sinfo.bh);
-       return 0;
-}
-
-/*
- * 1) Valid characters for the 8.3 format alias are any combination of
- * letters, uppercase alphabets, digits, any of the
- * following special characters:
- *     $ % ' ` - @ { } ~ ! # ( ) & _ ^
- * In this case Longfilename is not stored in disk.
- *
- * WinNT's Extension:
- * File name and extension name is contain uppercase/lowercase
- * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT.
- *
- * 2) File name is 8.3 format, but it contain the uppercase and
- * lowercase char, muliti bytes char, etc. In this case numtail is not
- * added, but Longfilename is stored.
- *
- * 3) When the one except for the above, or the following special
- * character are contained:
- *        .   [ ] ; , + =
- * numtail is added, and Longfilename must be stored in disk .
- */
-struct shortname_info {
-       unsigned char lower:1,
-                     upper:1,
-                     valid:1;
-};
-#define INIT_SHORTNAME_INFO(x) do {            \
-       (x)->lower = 1;                         \
-       (x)->upper = 1;                         \
-       (x)->valid = 1;                         \
-} while (0)
-
-static inline int to_shortname_char(struct nls_table *nls,
-                                   unsigned char *buf, int buf_size,
-                                   wchar_t *src, struct shortname_info *info)
-{
-       int len;
-
-       if (vfat_skip_char(*src)) {
-               info->valid = 0;
-               return 0;
-       }
-       if (vfat_replace_char(*src)) {
-               info->valid = 0;
-               buf[0] = '_';
-               return 1;
-       }
-
-       len = nls->uni2char(*src, buf, buf_size);
-       if (len <= 0) {
-               info->valid = 0;
-               buf[0] = '_';
-               len = 1;
-       } else if (len == 1) {
-               unsigned char prev = buf[0];
-
-               if (buf[0] >= 0x7F) {
-                       info->lower = 0;
-                       info->upper = 0;
-               }
-
-               buf[0] = nls_toupper(nls, buf[0]);
-               if (isalpha(buf[0])) {
-                       if (buf[0] == prev)
-                               info->lower = 0;
-                       else
-                               info->upper = 0;
-               }
-       } else {
-               info->lower = 0;
-               info->upper = 0;
-       }
-
-       return len;
-}
-
-/*
- * Given a valid longname, create a unique shortname.  Make sure the
- * shortname does not exist
- * Returns negative number on error, 0 for a normal
- * return, and 1 for valid shortname
- */
-static int vfat_create_shortname(struct inode *dir, struct nls_table *nls,
-                                wchar_t *uname, int ulen,
-                                unsigned char *name_res, unsigned char *lcase)
-{
-       struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options;
-       wchar_t *ip, *ext_start, *end, *name_start;
-       unsigned char base[9], ext[4], buf[8], *p;
-       unsigned char charbuf[NLS_MAX_CHARSET_SIZE];
-       int chl, chi;
-       int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen;
-       int is_shortname;
-       struct shortname_info base_info, ext_info;
-
-       is_shortname = 1;
-       INIT_SHORTNAME_INFO(&base_info);
-       INIT_SHORTNAME_INFO(&ext_info);
-
-       /* Now, we need to create a shortname from the long name */
-       ext_start = end = &uname[ulen];
-       while (--ext_start >= uname) {
-               if (*ext_start == 0x002E) {     /* is `.' */
-                       if (ext_start == end - 1) {
-                               sz = ulen;
-                               ext_start = NULL;
-                       }
-                       break;
-               }
-       }
-
-       if (ext_start == uname - 1) {
-               sz = ulen;
-               ext_start = NULL;
-       } else if (ext_start) {
-               /*
-                * Names which start with a dot could be just
-                * an extension eg. "...test".  In this case Win95
-                * uses the extension as the name and sets no extension.
-                */
-               name_start = &uname[0];
-               while (name_start < ext_start) {
-                       if (!vfat_skip_char(*name_start))
-                               break;
-                       name_start++;
-               }
-               if (name_start != ext_start) {
-                       sz = ext_start - uname;
-                       ext_start++;
-               } else {
-                       sz = ulen;
-                       ext_start = NULL;
-               }
-       }
-
-       numtail_baselen = 6;
-       numtail2_baselen = 2;
-       for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) {
-               chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
-                                       ip, &base_info);
-               if (chl == 0)
-                       continue;
-
-               if (baselen < 2 && (baselen + chl) > 2)
-                       numtail2_baselen = baselen;
-               if (baselen < 6 && (baselen + chl) > 6)
-                       numtail_baselen = baselen;
-               for (chi = 0; chi < chl; chi++) {
-                       *p++ = charbuf[chi];
-                       baselen++;
-                       if (baselen >= 8)
-                               break;
-               }
-               if (baselen >= 8) {
-                       if ((chi < chl - 1) || (ip + 1) - uname < sz)
-                               is_shortname = 0;
-                       break;
-               }
-       }
-       if (baselen == 0) {
-               return -EINVAL;
-       }
-
-       extlen = 0;
-       if (ext_start) {
-               for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) {
-                       chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
-                                               ip, &ext_info);
-                       if (chl == 0)
-                               continue;
-
-                       if ((extlen + chl) > 3) {
-                               is_shortname = 0;
-                               break;
-                       }
-                       for (chi = 0; chi < chl; chi++) {
-                               *p++ = charbuf[chi];
-                               extlen++;
-                       }
-                       if (extlen >= 3) {
-                               if (ip + 1 != end)
-                                       is_shortname = 0;
-                               break;
-                       }
-               }
-       }
-       ext[extlen] = '\0';
-       base[baselen] = '\0';
-
-       /* Yes, it can happen. ".\xe5" would do it. */
-       if (base[0] == DELETED_FLAG)
-               base[0] = 0x05;
-
-       /* OK, at this point we know that base is not longer than 8 symbols,
-        * ext is not longer than 3, base is nonempty, both don't contain
-        * any bad symbols (lowercase transformed to uppercase).
-        */
-
-       memset(name_res, ' ', MSDOS_NAME);
-       memcpy(name_res, base, baselen);
-       memcpy(name_res + 8, ext, extlen);
-       *lcase = 0;
-       if (is_shortname && base_info.valid && ext_info.valid) {
-               if (vfat_find_form(dir, name_res) == 0)
-                       return -EEXIST;
-
-               if (opts->shortname & VFAT_SFN_CREATE_WIN95) {
-                       return (base_info.upper && ext_info.upper);
-               } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) {
-                       if ((base_info.upper || base_info.lower) &&
-                           (ext_info.upper || ext_info.lower)) {
-                               if (!base_info.upper && base_info.lower)
-                                       *lcase |= CASE_LOWER_BASE;
-                               if (!ext_info.upper && ext_info.lower)
-                                       *lcase |= CASE_LOWER_EXT;
-                               return 1;
-                       }
-                       return 0;
-               } else {
-                       BUG();
-               }
-       }
-
-       if (opts->numtail == 0)
-               if (vfat_find_form(dir, name_res) < 0)
-                       return 0;
-
-       /*
-        * Try to find a unique extension.  This used to
-        * iterate through all possibilities sequentially,
-        * but that gave extremely bad performance.  Windows
-        * only tries a few cases before using random
-        * values for part of the base.
-        */
-
-       if (baselen > 6) {
-               baselen = numtail_baselen;
-               name_res[7] = ' ';
-       }
-       name_res[baselen] = '~';
-       for (i = 1; i < 10; i++) {
-               name_res[baselen + 1] = i + '0';
-               if (vfat_find_form(dir, name_res) < 0)
-                       return 0;
-       }
-
-       i = jiffies & 0xffff;
-       sz = (jiffies >> 16) & 0x7;
-       if (baselen > 2) {
-               baselen = numtail2_baselen;
-               name_res[7] = ' ';
-       }
-       name_res[baselen + 4] = '~';
-       name_res[baselen + 5] = '1' + sz;
-       while (1) {
-               sprintf(buf, "%04X", i);
-               memcpy(&name_res[baselen], buf, 4);
-               if (vfat_find_form(dir, name_res) < 0)
-                       break;
-               i -= 11;
-       }
-       return 0;
-}
-
-/* Translate a string, including coded sequences into Unicode */
-static int
-xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
-            int *longlen, int *outlen, int escape, int utf8,
-            struct nls_table *nls)
-{
-       const unsigned char *ip;
-       unsigned char nc;
-       unsigned char *op;
-       unsigned int ec;
-       int i, k, fill;
-       int charlen;
-
-       if (utf8) {
-               int name_len = strlen(name);
-
-               *outlen = utf8_mbstowcs((wchar_t *)outname, name, PATH_MAX);
-
-               /*
-                * We stripped '.'s before and set len appropriately,
-                * but utf8_mbstowcs doesn't care about len
-                */
-               *outlen -= (name_len - len);
-
-               if (*outlen > 255)
-                       return -ENAMETOOLONG;
-
-               op = &outname[*outlen * sizeof(wchar_t)];
-       } else {
-               if (nls) {
-                       for (i = 0, ip = name, op = outname, *outlen = 0;
-                            i < len && *outlen <= 255;
-                            *outlen += 1)
-                       {
-                               if (escape && (*ip == ':')) {
-                                       if (i > len - 5)
-                                               return -EINVAL;
-                                       ec = 0;
-                                       for (k = 1; k < 5; k++) {
-                                               nc = ip[k];
-                                               ec <<= 4;
-                                               if (nc >= '0' && nc <= '9') {
-                                                       ec |= nc - '0';
-                                                       continue;
-                                               }
-                                               if (nc >= 'a' && nc <= 'f') {
-                                                       ec |= nc - ('a' - 10);
-                                                       continue;
-                                               }
-                                               if (nc >= 'A' && nc <= 'F') {
-                                                       ec |= nc - ('A' - 10);
-                                                       continue;
-                                               }
-                                               return -EINVAL;
-                                       }
-                                       *op++ = ec & 0xFF;
-                                       *op++ = ec >> 8;
-                                       ip += 5;
-                                       i += 5;
-                               } else {
-                                       if ((charlen = nls->char2uni(ip, len - i, (wchar_t *)op)) < 0)
-                                               return -EINVAL;
-                                       ip += charlen;
-                                       i += charlen;
-                                       op += 2;
-                               }
-                       }
-                       if (i < len)
-                               return -ENAMETOOLONG;
-               } else {
-                       for (i = 0, ip = name, op = outname, *outlen = 0;
-                            i < len && *outlen <= 255;
-                            i++, *outlen += 1)
-                       {
-                               *op++ = *ip++;
-                               *op++ = 0;
-                       }
-                       if (i < len)
-                               return -ENAMETOOLONG;
-               }
-       }
-
-       *longlen = *outlen;
-       if (*outlen % 13) {
-               *op++ = 0;
-               *op++ = 0;
-               *outlen += 1;
-               if (*outlen % 13) {
-                       fill = 13 - (*outlen % 13);
-                       for (i = 0; i < fill; i++) {
-                               *op++ = 0xff;
-                               *op++ = 0xff;
-                       }
-                       *outlen += fill;
-               }
-       }
-
-       return 0;
-}
-
-static int vfat_build_slots(struct inode *dir, const unsigned char *name,
-                           int len, int is_dir, int cluster,
-                           struct timespec *ts,
-                           struct msdos_dir_slot *slots, int *nr_slots)
-{
-       struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
-       struct fat_mount_options *opts = &sbi->options;
-       struct msdos_dir_slot *ps;
-       struct msdos_dir_entry *de;
-       unsigned char cksum, lcase;
-       unsigned char msdos_name[MSDOS_NAME];
-       wchar_t *uname;
-       __le16 time, date;
-       int err, ulen, usize, i;
-       loff_t offset;
-
-       *nr_slots = 0;
-
-       uname = __getname();
-       if (!uname)
-               return -ENOMEM;
-
-       err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize,
-                          opts->unicode_xlate, opts->utf8, sbi->nls_io);
-       if (err)
-               goto out_free;
-
-       err = vfat_is_used_badchars(uname, ulen);
-       if (err)
-               goto out_free;
-
-       err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen,
-                                   msdos_name, &lcase);
-       if (err < 0)
-               goto out_free;
-       else if (err == 1) {
-               de = (struct msdos_dir_entry *)slots;
-               err = 0;
-               goto shortname;
-       }
-
-       /* build the entry of long file name */
-       cksum = fat_checksum(msdos_name);
-
-       *nr_slots = usize / 13;
-       for (ps = slots, i = *nr_slots; i > 0; i--, ps++) {
-               ps->id = i;
-               ps->attr = ATTR_EXT;
-               ps->reserved = 0;
-               ps->alias_checksum = cksum;
-               ps->start = 0;
-               offset = (i - 1) * 13;
-               fatwchar_to16(ps->name0_4, uname + offset, 5);
-               fatwchar_to16(ps->name5_10, uname + offset + 5, 6);
-               fatwchar_to16(ps->name11_12, uname + offset + 11, 2);
-       }
-       slots[0].id |= 0x40;
-       de = (struct msdos_dir_entry *)ps;
-
-shortname:
-       /* build the entry of 8.3 alias name */
-       (*nr_slots)++;
-       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);
-       de->time = de->ctime = time;
-       de->date = de->cdate = de->adate = date;
-       de->ctime_cs = 0;
-       de->start = cpu_to_le16(cluster);
-       de->starthi = cpu_to_le16(cluster >> 16);
-       de->size = 0;
-out_free:
-       __putname(uname);
-       return err;
-}
-
-static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir,
-                         int cluster, struct timespec *ts,
-                         struct fat_slot_info *sinfo)
-{
-       struct msdos_dir_slot *slots;
-       unsigned int len;
-       int err, nr_slots;
-
-       len = vfat_striptail_len(qname);
-       if (len == 0)
-               return -ENOENT;
-
-       slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS);
-       if (slots == NULL)
-               return -ENOMEM;
-
-       err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts,
-                              slots, &nr_slots);
-       if (err)
-               goto cleanup;
-
-       err = fat_add_entries(dir, slots, nr_slots, sinfo);
-       if (err)
-               goto cleanup;
-
-       /* update timestamp */
-       dir->i_ctime = dir->i_mtime = dir->i_atime = *ts;
-       if (IS_DIRSYNC(dir))
-               (void)fat_sync_inode(dir);
-       else
-               mark_inode_dirty(dir);
-cleanup:
-       kfree(slots);
-       return err;
-}
-
-static int vfat_find(struct inode *dir, struct qstr *qname,
-                    struct fat_slot_info *sinfo)
-{
-       unsigned int len = vfat_striptail_len(qname);
-       if (len == 0)
-               return -ENOENT;
-       return fat_search_long(dir, qname->name, len, sinfo);
-}
-
-static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
-                                 struct nameidata *nd)
-{
-       struct super_block *sb = dir->i_sb;
-       struct fat_slot_info sinfo;
-       struct inode *inode = NULL;
-       struct dentry *alias;
-       int err, table;
-
-       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++;
-               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);
-       }
-       alias = d_find_alias(inode);
-       if (alias) {
-               if (d_invalidate(alias) == 0)
-                       dput(alias);
-               else {
-                       iput(inode);
-                       unlock_super(sb);
-                       return alias;
-               }
-
-       }
-error:
-       unlock_super(sb);
-       dentry->d_op = &vfat_dentry_ops[table];
-       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_time = dentry->d_parent->d_inode->i_version;
-       }
-       return dentry;
-}
-
-static int vfat_create(struct inode *dir, struct dentry *dentry, int mode,
-                      struct nameidata *nd)
-{
-       struct super_block *sb = dir->i_sb;
-       struct inode *inode;
-       struct fat_slot_info sinfo;
-       struct timespec ts;
-       int err;
-
-       lock_super(sb);
-
-       ts = CURRENT_TIME_SEC;
-       err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo);
-       if (err)
-               goto out;
-       dir->i_version++;
-
-       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
-       brelse(sinfo.bh);
-       if (IS_ERR(inode)) {
-               err = PTR_ERR(inode);
-               goto out;
-       }
-       inode->i_version++;
-       inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
-       /* timestamp is already written, so mark_inode_dirty() is unneeded. */
-
-       dentry->d_time = dentry->d_parent->d_inode->i_version;
-       d_instantiate(dentry, inode);
-out:
-       unlock_super(sb);
-       return err;
-}
-
-static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
-{
-       struct inode *inode = dentry->d_inode;
-       struct super_block *sb = dir->i_sb;
-       struct fat_slot_info sinfo;
-       int err;
-
-       lock_super(sb);
-
-       err = fat_dir_empty(inode);
-       if (err)
-               goto out;
-       err = vfat_find(dir, &dentry->d_name, &sinfo);
-       if (err)
-               goto out;
-
-       err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
-       if (err)
-               goto out;
-       drop_nlink(dir);
-
-       clear_nlink(inode);
-       inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
-       fat_detach(inode);
-out:
-       unlock_super(sb);
-
-       return err;
-}
-
-static int vfat_unlink(struct inode *dir, struct dentry *dentry)
-{
-       struct inode *inode = dentry->d_inode;
-       struct super_block *sb = dir->i_sb;
-       struct fat_slot_info sinfo;
-       int err;
-
-       lock_super(sb);
-
-       err = vfat_find(dir, &dentry->d_name, &sinfo);
-       if (err)
-               goto out;
-
-       err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
-       if (err)
-               goto out;
-       clear_nlink(inode);
-       inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
-       fat_detach(inode);
-out:
-       unlock_super(sb);
-
-       return err;
-}
-
-static int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
-       struct super_block *sb = dir->i_sb;
-       struct inode *inode;
-       struct fat_slot_info sinfo;
-       struct timespec ts;
-       int err, cluster;
-
-       lock_super(sb);
-
-       ts = CURRENT_TIME_SEC;
-       cluster = fat_alloc_new_dir(dir, &ts);
-       if (cluster < 0) {
-               err = cluster;
-               goto out;
-       }
-       err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo);
-       if (err)
-               goto out_free;
-       dir->i_version++;
-       inc_nlink(dir);
-
-       inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
-       brelse(sinfo.bh);
-       if (IS_ERR(inode)) {
-               err = PTR_ERR(inode);
-               /* the directory was completed, just return a error */
-               goto out;
-       }
-       inode->i_version++;
-       inode->i_nlink = 2;
-       inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
-       /* timestamp is already written, so mark_inode_dirty() is unneeded. */
-
-       dentry->d_time = dentry->d_parent->d_inode->i_version;
-       d_instantiate(dentry, inode);
-
-       unlock_super(sb);
-       return 0;
-
-out_free:
-       fat_free_clusters(dir, cluster);
-out:
-       unlock_super(sb);
-       return err;
-}
-
-static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
-                      struct inode *new_dir, struct dentry *new_dentry)
-{
-       struct buffer_head *dotdot_bh;
-       struct msdos_dir_entry *dotdot_de;
-       struct inode *old_inode, *new_inode;
-       struct fat_slot_info old_sinfo, sinfo;
-       struct timespec ts;
-       loff_t dotdot_i_pos, new_i_pos;
-       int err, is_dir, update_dotdot, corrupt = 0;
-       struct super_block *sb = old_dir->i_sb;
-
-       old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
-       old_inode = old_dentry->d_inode;
-       new_inode = new_dentry->d_inode;
-       lock_super(sb);
-       err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo);
-       if (err)
-               goto out;
-
-       is_dir = S_ISDIR(old_inode->i_mode);
-       update_dotdot = (is_dir && old_dir != new_dir);
-       if (update_dotdot) {
-               if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
-                                        &dotdot_i_pos) < 0) {
-                       err = -EIO;
-                       goto out;
-               }
-       }
-
-       ts = CURRENT_TIME_SEC;
-       if (new_inode) {
-               if (is_dir) {
-                       err = fat_dir_empty(new_inode);
-                       if (err)
-                               goto out;
-               }
-               new_i_pos = MSDOS_I(new_inode)->i_pos;
-               fat_detach(new_inode);
-       } else {
-               err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0,
-                                    &ts, &sinfo);
-               if (err)
-                       goto out;
-               new_i_pos = sinfo.i_pos;
-       }
-       new_dir->i_version++;
-
-       fat_detach(old_inode);
-       fat_attach(old_inode, new_i_pos);
-       if (IS_DIRSYNC(new_dir)) {
-               err = fat_sync_inode(old_inode);
-               if (err)
-                       goto error_inode;
-       } else
-               mark_inode_dirty(old_inode);
-
-       if (update_dotdot) {
-               int start = MSDOS_I(new_dir)->i_logstart;
-               dotdot_de->start = cpu_to_le16(start);
-               dotdot_de->starthi = cpu_to_le16(start >> 16);
-               mark_buffer_dirty(dotdot_bh);
-               if (IS_DIRSYNC(new_dir)) {
-                       err = sync_dirty_buffer(dotdot_bh);
-                       if (err)
-                               goto error_dotdot;
-               }
-               drop_nlink(old_dir);
-               if (!new_inode)
-                       inc_nlink(new_dir);
-       }
-
-       err = fat_remove_entries(old_dir, &old_sinfo);  /* and releases bh */
-       old_sinfo.bh = NULL;
-       if (err)
-               goto error_dotdot;
-       old_dir->i_version++;
-       old_dir->i_ctime = old_dir->i_mtime = ts;
-       if (IS_DIRSYNC(old_dir))
-               (void)fat_sync_inode(old_dir);
-       else
-               mark_inode_dirty(old_dir);
-
-       if (new_inode) {
-               drop_nlink(new_inode);
-               if (is_dir)
-                       drop_nlink(new_inode);
-               new_inode->i_ctime = ts;
-       }
-out:
-       brelse(sinfo.bh);
-       brelse(dotdot_bh);
-       brelse(old_sinfo.bh);
-       unlock_super(sb);
-
-       return err;
-
-error_dotdot:
-       /* data cluster is shared, serious corruption */
-       corrupt = 1;
-
-       if (update_dotdot) {
-               int start = MSDOS_I(old_dir)->i_logstart;
-               dotdot_de->start = cpu_to_le16(start);
-               dotdot_de->starthi = cpu_to_le16(start >> 16);
-               mark_buffer_dirty(dotdot_bh);
-               corrupt |= sync_dirty_buffer(dotdot_bh);
-       }
-error_inode:
-       fat_detach(old_inode);
-       fat_attach(old_inode, old_sinfo.i_pos);
-       if (new_inode) {
-               fat_attach(new_inode, new_i_pos);
-               if (corrupt)
-                       corrupt |= fat_sync_inode(new_inode);
-       } else {
-               /*
-                * If new entry was not sharing the data cluster, it
-                * shouldn't be serious corruption.
-                */
-               int err2 = fat_remove_entries(new_dir, &sinfo);
-               if (corrupt)
-                       corrupt |= err2;
-               sinfo.bh = NULL;
-       }
-       if (corrupt < 0) {
-               fat_fs_panic(new_dir->i_sb,
-                            "%s: Filesystem corrupted (i_pos %lld)",
-                            __func__, sinfo.i_pos);
-       }
-       goto out;
-}
-
-static const struct inode_operations vfat_dir_inode_operations = {
-       .create         = vfat_create,
-       .lookup         = vfat_lookup,
-       .unlink         = vfat_unlink,
-       .mkdir          = vfat_mkdir,
-       .rmdir          = vfat_rmdir,
-       .rename         = vfat_rename,
-       .setattr        = fat_setattr,
-       .getattr        = fat_getattr,
-};
-
-static int vfat_fill_super(struct super_block *sb, void *data, int silent)
-{
-       int res;
-
-       res = fat_fill_super(sb, data, silent, &vfat_dir_inode_operations, 1);
-       if (res)
-               return res;
-
-       if (MSDOS_SB(sb)->options.name_check != 's')
-               sb->s_root->d_op = &vfat_dentry_ops[0];
-       else
-               sb->s_root->d_op = &vfat_dentry_ops[2];
-
-       return 0;
-}
-
-static int vfat_get_sb(struct file_system_type *fs_type,
-                      int flags, const char *dev_name,
-                      void *data, struct vfsmount *mnt)
-{
-       return get_sb_bdev(fs_type, flags, dev_name, data, vfat_fill_super,
-                          mnt);
-}
-
-static struct file_system_type vfat_fs_type = {
-       .owner          = THIS_MODULE,
-       .name           = "vfat",
-       .get_sb         = vfat_get_sb,
-       .kill_sb        = kill_block_super,
-       .fs_flags       = FS_REQUIRES_DEV,
-};
-
-static int __init init_vfat_fs(void)
-{
-       return register_filesystem(&vfat_fs_type);
-}
-
-static void __exit exit_vfat_fs(void)
-{
-       unregister_filesystem(&vfat_fs_type);
-}
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("VFAT filesystem support");
-MODULE_AUTHOR("Gordon Chaffee");
-
-module_init(init_vfat_fs)
-module_exit(exit_vfat_fs)