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689 lines
17 KiB
689 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/fs/msdos/namei.c |
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* |
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* Written 1992,1993 by Werner Almesberger |
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* Hidden files 1995 by Albert Cahalan <[email protected]> <[email protected]> |
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* Rewritten for constant inumbers 1999 by Al Viro |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/iversion.h> |
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#include "fat.h" |
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|
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/* Characters that are undesirable in an MS-DOS file name */ |
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static unsigned char bad_chars[] = "*?<>|\""; |
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static unsigned char bad_if_strict[] = "+=,; "; |
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|
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/***** Formats an MS-DOS file name. Rejects invalid names. */ |
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static int msdos_format_name(const unsigned char *name, int len, |
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unsigned char *res, struct fat_mount_options *opts) |
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/* |
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* name is the proposed name, len is its length, res is |
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* the resulting name, opts->name_check is either (r)elaxed, |
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* (n)ormal or (s)trict, opts->dotsOK allows dots at the |
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* beginning of name (for hidden files) |
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*/ |
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{ |
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unsigned char *walk; |
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unsigned char c; |
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int space; |
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if (name[0] == '.') { /* dotfile because . and .. already done */ |
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if (opts->dotsOK) { |
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/* Get rid of dot - test for it elsewhere */ |
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name++; |
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len--; |
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} else |
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return -EINVAL; |
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} |
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/* |
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* disallow names that _really_ start with a dot |
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*/ |
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space = 1; |
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c = 0; |
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for (walk = res; len && walk - res < 8; walk++) { |
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c = *name++; |
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len--; |
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if (opts->name_check != 'r' && strchr(bad_chars, c)) |
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return -EINVAL; |
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if (opts->name_check == 's' && strchr(bad_if_strict, c)) |
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return -EINVAL; |
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if (c >= 'A' && c <= 'Z' && opts->name_check == 's') |
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return -EINVAL; |
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if (c < ' ' || c == ':' || c == '\\') |
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return -EINVAL; |
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/* |
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* 0xE5 is legal as a first character, but we must substitute |
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* 0x05 because 0xE5 marks deleted files. Yes, DOS really |
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* does this. |
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* It seems that Microsoft hacked DOS to support non-US |
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* characters after the 0xE5 character was already in use to |
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* mark deleted files. |
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*/ |
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if ((res == walk) && (c == 0xE5)) |
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c = 0x05; |
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if (c == '.') |
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break; |
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space = (c == ' '); |
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*walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c; |
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} |
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if (space) |
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return -EINVAL; |
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if (opts->name_check == 's' && len && c != '.') { |
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c = *name++; |
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len--; |
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if (c != '.') |
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return -EINVAL; |
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} |
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while (c != '.' && len--) |
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c = *name++; |
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if (c == '.') { |
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while (walk - res < 8) |
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*walk++ = ' '; |
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while (len > 0 && walk - res < MSDOS_NAME) { |
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c = *name++; |
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len--; |
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if (opts->name_check != 'r' && strchr(bad_chars, c)) |
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return -EINVAL; |
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if (opts->name_check == 's' && |
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strchr(bad_if_strict, c)) |
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return -EINVAL; |
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if (c < ' ' || c == ':' || c == '\\') |
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return -EINVAL; |
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if (c == '.') { |
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if (opts->name_check == 's') |
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return -EINVAL; |
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break; |
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} |
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if (c >= 'A' && c <= 'Z' && opts->name_check == 's') |
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return -EINVAL; |
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space = c == ' '; |
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if (!opts->nocase && c >= 'a' && c <= 'z') |
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*walk++ = c - 32; |
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else |
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*walk++ = c; |
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} |
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if (space) |
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return -EINVAL; |
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if (opts->name_check == 's' && len) |
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return -EINVAL; |
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} |
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while (walk - res < MSDOS_NAME) |
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*walk++ = ' '; |
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return 0; |
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} |
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/***** Locates a directory entry. Uses unformatted name. */ |
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static int msdos_find(struct inode *dir, const unsigned char *name, int len, |
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struct fat_slot_info *sinfo) |
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{ |
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struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
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unsigned char msdos_name[MSDOS_NAME]; |
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int err; |
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err = msdos_format_name(name, len, msdos_name, &sbi->options); |
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if (err) |
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return -ENOENT; |
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err = fat_scan(dir, msdos_name, sinfo); |
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if (!err && sbi->options.dotsOK) { |
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if (name[0] == '.') { |
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if (!(sinfo->de->attr & ATTR_HIDDEN)) |
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err = -ENOENT; |
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} else { |
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if (sinfo->de->attr & ATTR_HIDDEN) |
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err = -ENOENT; |
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} |
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if (err) |
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brelse(sinfo->bh); |
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} |
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return err; |
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} |
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/* |
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* Compute the hash for the msdos name corresponding to the dentry. |
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* Note: if the name is invalid, we leave the hash code unchanged so |
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* that the existing dentry can be used. The msdos fs routines will |
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* return ENOENT or EINVAL as appropriate. |
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*/ |
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static int msdos_hash(const struct dentry *dentry, struct qstr *qstr) |
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{ |
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struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; |
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unsigned char msdos_name[MSDOS_NAME]; |
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int error; |
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error = msdos_format_name(qstr->name, qstr->len, msdos_name, options); |
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if (!error) |
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qstr->hash = full_name_hash(dentry, msdos_name, MSDOS_NAME); |
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return 0; |
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} |
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/* |
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* Compare two msdos names. If either of the names are invalid, |
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* we fall back to doing the standard name comparison. |
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*/ |
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static int msdos_cmp(const struct dentry *dentry, |
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unsigned int len, const char *str, const struct qstr *name) |
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{ |
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struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; |
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unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME]; |
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int error; |
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error = msdos_format_name(name->name, name->len, a_msdos_name, options); |
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if (error) |
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goto old_compare; |
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error = msdos_format_name(str, len, b_msdos_name, options); |
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if (error) |
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goto old_compare; |
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error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME); |
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out: |
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return error; |
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old_compare: |
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error = 1; |
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if (name->len == len) |
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error = memcmp(name->name, str, len); |
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goto out; |
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} |
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static const struct dentry_operations msdos_dentry_operations = { |
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.d_hash = msdos_hash, |
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.d_compare = msdos_cmp, |
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}; |
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/* |
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* AV. Wrappers for FAT sb operations. Is it wise? |
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*/ |
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/***** Get inode using directory and name */ |
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static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry, |
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unsigned int flags) |
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{ |
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struct super_block *sb = dir->i_sb; |
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struct fat_slot_info sinfo; |
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struct inode *inode; |
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int err; |
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mutex_lock(&MSDOS_SB(sb)->s_lock); |
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err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
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switch (err) { |
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case -ENOENT: |
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inode = NULL; |
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break; |
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case 0: |
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inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
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brelse(sinfo.bh); |
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break; |
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default: |
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inode = ERR_PTR(err); |
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} |
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mutex_unlock(&MSDOS_SB(sb)->s_lock); |
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return d_splice_alias(inode, dentry); |
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} |
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/***** Creates a directory entry (name is already formatted). */ |
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static int msdos_add_entry(struct inode *dir, const unsigned char *name, |
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int is_dir, int is_hid, int cluster, |
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struct timespec64 *ts, struct fat_slot_info *sinfo) |
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{ |
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struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
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struct msdos_dir_entry de; |
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__le16 time, date; |
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int err; |
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memcpy(de.name, name, MSDOS_NAME); |
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de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; |
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if (is_hid) |
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de.attr |= ATTR_HIDDEN; |
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de.lcase = 0; |
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fat_time_unix2fat(sbi, ts, &time, &date, NULL); |
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de.cdate = de.adate = 0; |
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de.ctime = 0; |
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de.ctime_cs = 0; |
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de.time = time; |
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de.date = date; |
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fat_set_start(&de, cluster); |
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de.size = 0; |
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err = fat_add_entries(dir, &de, 1, sinfo); |
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if (err) |
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return err; |
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fat_truncate_time(dir, ts, S_CTIME|S_MTIME); |
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if (IS_DIRSYNC(dir)) |
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(void)fat_sync_inode(dir); |
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else |
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mark_inode_dirty(dir); |
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return 0; |
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} |
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/***** Create a file */ |
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static int msdos_create(struct user_namespace *mnt_userns, struct inode *dir, |
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struct dentry *dentry, umode_t mode, bool excl) |
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{ |
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struct super_block *sb = dir->i_sb; |
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struct inode *inode = NULL; |
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struct fat_slot_info sinfo; |
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struct timespec64 ts; |
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unsigned char msdos_name[MSDOS_NAME]; |
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int err, is_hid; |
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mutex_lock(&MSDOS_SB(sb)->s_lock); |
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err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, |
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msdos_name, &MSDOS_SB(sb)->options); |
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if (err) |
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goto out; |
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is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); |
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/* Have to do it due to foo vs. .foo conflicts */ |
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if (!fat_scan(dir, msdos_name, &sinfo)) { |
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brelse(sinfo.bh); |
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err = -EINVAL; |
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goto out; |
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} |
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ts = current_time(dir); |
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err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); |
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if (err) |
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goto out; |
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inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
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brelse(sinfo.bh); |
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if (IS_ERR(inode)) { |
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err = PTR_ERR(inode); |
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goto out; |
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} |
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fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME); |
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/* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
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d_instantiate(dentry, inode); |
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out: |
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mutex_unlock(&MSDOS_SB(sb)->s_lock); |
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if (!err) |
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err = fat_flush_inodes(sb, dir, inode); |
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return err; |
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} |
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/***** Remove a directory */ |
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static int msdos_rmdir(struct inode *dir, struct dentry *dentry) |
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{ |
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struct super_block *sb = dir->i_sb; |
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struct inode *inode = d_inode(dentry); |
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struct fat_slot_info sinfo; |
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int err; |
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mutex_lock(&MSDOS_SB(sb)->s_lock); |
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err = fat_dir_empty(inode); |
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if (err) |
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goto out; |
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err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
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if (err) |
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goto out; |
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err = fat_remove_entries(dir, &sinfo); /* and releases bh */ |
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if (err) |
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goto out; |
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drop_nlink(dir); |
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clear_nlink(inode); |
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fat_truncate_time(inode, NULL, S_CTIME); |
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fat_detach(inode); |
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out: |
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mutex_unlock(&MSDOS_SB(sb)->s_lock); |
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if (!err) |
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err = fat_flush_inodes(sb, dir, inode); |
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return err; |
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} |
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/***** Make a directory */ |
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static int msdos_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
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struct dentry *dentry, umode_t mode) |
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{ |
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struct super_block *sb = dir->i_sb; |
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struct fat_slot_info sinfo; |
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struct inode *inode; |
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unsigned char msdos_name[MSDOS_NAME]; |
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struct timespec64 ts; |
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int err, is_hid, cluster; |
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mutex_lock(&MSDOS_SB(sb)->s_lock); |
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err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, |
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msdos_name, &MSDOS_SB(sb)->options); |
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if (err) |
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goto out; |
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is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); |
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/* foo vs .foo situation */ |
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if (!fat_scan(dir, msdos_name, &sinfo)) { |
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brelse(sinfo.bh); |
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err = -EINVAL; |
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goto out; |
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} |
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ts = current_time(dir); |
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cluster = fat_alloc_new_dir(dir, &ts); |
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if (cluster < 0) { |
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err = cluster; |
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goto out; |
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} |
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err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo); |
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if (err) |
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goto out_free; |
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inc_nlink(dir); |
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inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
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brelse(sinfo.bh); |
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if (IS_ERR(inode)) { |
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err = PTR_ERR(inode); |
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/* the directory was completed, just return a error */ |
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goto out; |
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} |
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set_nlink(inode, 2); |
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fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME); |
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/* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
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d_instantiate(dentry, inode); |
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mutex_unlock(&MSDOS_SB(sb)->s_lock); |
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fat_flush_inodes(sb, dir, inode); |
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return 0; |
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out_free: |
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fat_free_clusters(dir, cluster); |
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out: |
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mutex_unlock(&MSDOS_SB(sb)->s_lock); |
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return err; |
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} |
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/***** Unlink a file */ |
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static int msdos_unlink(struct inode *dir, struct dentry *dentry) |
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{ |
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struct inode *inode = d_inode(dentry); |
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struct super_block *sb = inode->i_sb; |
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struct fat_slot_info sinfo; |
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int err; |
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mutex_lock(&MSDOS_SB(sb)->s_lock); |
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err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
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if (err) |
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goto out; |
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err = fat_remove_entries(dir, &sinfo); /* and releases bh */ |
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if (err) |
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goto out; |
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clear_nlink(inode); |
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fat_truncate_time(inode, NULL, S_CTIME); |
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fat_detach(inode); |
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out: |
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mutex_unlock(&MSDOS_SB(sb)->s_lock); |
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if (!err) |
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err = fat_flush_inodes(sb, dir, inode); |
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return err; |
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} |
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static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, |
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struct dentry *old_dentry, |
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struct inode *new_dir, unsigned char *new_name, |
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struct dentry *new_dentry, int is_hid) |
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{ |
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struct buffer_head *dotdot_bh; |
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struct msdos_dir_entry *dotdot_de; |
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struct inode *old_inode, *new_inode; |
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struct fat_slot_info old_sinfo, sinfo; |
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struct timespec64 ts; |
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loff_t new_i_pos; |
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int err, old_attrs, is_dir, update_dotdot, corrupt = 0; |
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old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; |
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old_inode = d_inode(old_dentry); |
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new_inode = d_inode(new_dentry); |
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err = fat_scan(old_dir, old_name, &old_sinfo); |
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if (err) { |
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err = -EIO; |
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goto out; |
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} |
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is_dir = S_ISDIR(old_inode->i_mode); |
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update_dotdot = (is_dir && old_dir != new_dir); |
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if (update_dotdot) { |
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if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) { |
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err = -EIO; |
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goto out; |
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} |
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} |
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|
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old_attrs = MSDOS_I(old_inode)->i_attrs; |
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err = fat_scan(new_dir, new_name, &sinfo); |
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if (!err) { |
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if (!new_inode) { |
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/* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ |
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if (sinfo.de != old_sinfo.de) { |
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err = -EINVAL; |
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goto out; |
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} |
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if (is_hid) |
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MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; |
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else |
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MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; |
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if (IS_DIRSYNC(old_dir)) { |
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err = fat_sync_inode(old_inode); |
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if (err) { |
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MSDOS_I(old_inode)->i_attrs = old_attrs; |
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goto out; |
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} |
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} else |
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mark_inode_dirty(old_inode); |
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|
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inode_inc_iversion(old_dir); |
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fat_truncate_time(old_dir, NULL, S_CTIME|S_MTIME); |
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if (IS_DIRSYNC(old_dir)) |
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(void)fat_sync_inode(old_dir); |
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else |
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mark_inode_dirty(old_dir); |
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goto out; |
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} |
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} |
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|
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ts = current_time(old_inode); |
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if (new_inode) { |
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if (err) |
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goto out; |
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if (is_dir) { |
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err = fat_dir_empty(new_inode); |
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if (err) |
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goto out; |
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} |
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new_i_pos = MSDOS_I(new_inode)->i_pos; |
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fat_detach(new_inode); |
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} else { |
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err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, |
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&ts, &sinfo); |
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if (err) |
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goto out; |
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new_i_pos = sinfo.i_pos; |
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} |
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inode_inc_iversion(new_dir); |
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|
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fat_detach(old_inode); |
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fat_attach(old_inode, new_i_pos); |
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if (is_hid) |
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MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; |
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else |
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MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; |
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if (IS_DIRSYNC(new_dir)) { |
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err = fat_sync_inode(old_inode); |
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if (err) |
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goto error_inode; |
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} else |
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mark_inode_dirty(old_inode); |
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|
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if (update_dotdot) { |
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fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart); |
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mark_buffer_dirty_inode(dotdot_bh, old_inode); |
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if (IS_DIRSYNC(new_dir)) { |
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err = sync_dirty_buffer(dotdot_bh); |
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if (err) |
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goto error_dotdot; |
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} |
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drop_nlink(old_dir); |
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if (!new_inode) |
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inc_nlink(new_dir); |
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} |
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|
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err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ |
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old_sinfo.bh = NULL; |
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if (err) |
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goto error_dotdot; |
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inode_inc_iversion(old_dir); |
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fat_truncate_time(old_dir, &ts, S_CTIME|S_MTIME); |
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if (IS_DIRSYNC(old_dir)) |
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(void)fat_sync_inode(old_dir); |
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else |
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mark_inode_dirty(old_dir); |
|
|
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if (new_inode) { |
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drop_nlink(new_inode); |
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if (is_dir) |
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drop_nlink(new_inode); |
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fat_truncate_time(new_inode, &ts, S_CTIME); |
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} |
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out: |
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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) { |
|
fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart); |
|
mark_buffer_dirty_inode(dotdot_bh, old_inode); |
|
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_error(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 user_namespace *mnt_userns, |
|
struct inode *old_dir, struct dentry *old_dentry, |
|
struct inode *new_dir, struct dentry *new_dentry, |
|
unsigned int flags) |
|
{ |
|
struct super_block *sb = old_dir->i_sb; |
|
unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; |
|
int err, is_hid; |
|
|
|
if (flags & ~RENAME_NOREPLACE) |
|
return -EINVAL; |
|
|
|
mutex_lock(&MSDOS_SB(sb)->s_lock); |
|
|
|
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: |
|
mutex_unlock(&MSDOS_SB(sb)->s_lock); |
|
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, |
|
.update_time = fat_update_time, |
|
}; |
|
|
|
static void setup(struct super_block *sb) |
|
{ |
|
MSDOS_SB(sb)->dir_ops = &msdos_dir_inode_operations; |
|
sb->s_d_op = &msdos_dentry_operations; |
|
sb->s_flags |= SB_NOATIME; |
|
} |
|
|
|
static int msdos_fill_super(struct super_block *sb, void *data, int silent) |
|
{ |
|
return fat_fill_super(sb, data, silent, 0, setup); |
|
} |
|
|
|
static struct dentry *msdos_mount(struct file_system_type *fs_type, |
|
int flags, const char *dev_name, |
|
void *data) |
|
{ |
|
return mount_bdev(fs_type, flags, dev_name, data, msdos_fill_super); |
|
} |
|
|
|
static struct file_system_type msdos_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "msdos", |
|
.mount = msdos_mount, |
|
.kill_sb = kill_block_super, |
|
.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, |
|
}; |
|
MODULE_ALIAS_FS("msdos"); |
|
|
|
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)
|
|
|