690 lines
17 KiB
C
690 lines
17 KiB
C
// 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 <albert@ccs.neu.edu> <adc@coe.neu.edu>
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* Rewritten for constant inumbers 1999 by Al Viro
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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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/* 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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/***** 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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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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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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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)
|
|
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;
|
|
}
|
|
inode_inc_iversion(new_dir);
|
|
|
|
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) {
|
|
fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart);
|
|
mark_buffer_dirty_inode(dotdot_bh, old_inode);
|
|
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;
|
|
inode_inc_iversion(old_dir);
|
|
fat_truncate_time(old_dir, &ts, S_CTIME|S_MTIME);
|
|
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);
|
|
fat_truncate_time(new_inode, &ts, S_CTIME);
|
|
}
|
|
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) {
|
|
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)
|