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+
#
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
--- /dev/null
+/*
+ * 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)
--- /dev/null
+/*
+ * 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)
+++ /dev/null
-#
-# Makefile for the Linux msdos filesystem routines.
-#
-
-obj-$(CONFIG_MSDOS_FS) += msdos.o
-
-msdos-y := namei.o
+++ /dev/null
-/*
- * 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)
+++ /dev/null
-#
-# Makefile for the linux vfat-filesystem routines.
-#
-
-obj-$(CONFIG_VFAT_FS) += vfat.o
-
-vfat-y := namei.o
+++ /dev/null
-/*
- * 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)
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff