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-rw-r--r--fs/msdos/Makefile7
-rw-r--r--fs/msdos/namei.c702
2 files changed, 0 insertions, 709 deletions
diff --git a/fs/msdos/Makefile b/fs/msdos/Makefile
deleted file mode 100644
index ea67646fcb95..000000000000
--- a/fs/msdos/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Makefile for the Linux msdos filesystem routines.
-#
-
-obj-$(CONFIG_MSDOS_FS) += msdos.o
-
-msdos-y := namei.o
diff --git a/fs/msdos/namei.c b/fs/msdos/namei.c
deleted file mode 100644
index e844b9809d27..000000000000
--- a/fs/msdos/namei.c
+++ /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)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 03:42:47 +0000