^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/fs/msdos/namei.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written 1992,1993 by Werner Almesberger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Rewritten for constant inumbers 1999 by Al Viro
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/iversion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "fat.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) /* Characters that are undesirable in an MS-DOS file name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static unsigned char bad_chars[] = "*?<>|\"";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static unsigned char bad_if_strict[] = "+=,; ";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /***** Formats an MS-DOS file name. Rejects invalid names. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int msdos_format_name(const unsigned char *name, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) unsigned char *res, struct fat_mount_options *opts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * name is the proposed name, len is its length, res is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * the resulting name, opts->name_check is either (r)elaxed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * (n)ormal or (s)trict, opts->dotsOK allows dots at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * beginning of name (for hidden files)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) unsigned char *walk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) unsigned char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) int space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) if (name[0] == '.') { /* dotfile because . and .. already done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) if (opts->dotsOK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* Get rid of dot - test for it elsewhere */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) name++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * disallow names that _really_ start with a dot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) space = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) c = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) for (walk = res; len && walk - res < 8; walk++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) c = *name++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (opts->name_check != 'r' && strchr(bad_chars, c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (opts->name_check == 's' && strchr(bad_if_strict, c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (c < ' ' || c == ':' || c == '\\')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * 0xE5 is legal as a first character, but we must substitute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * 0x05 because 0xE5 marks deleted files. Yes, DOS really
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * does this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * It seems that Microsoft hacked DOS to support non-US
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * characters after the 0xE5 character was already in use to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * mark deleted files.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if ((res == walk) && (c == 0xE5))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) c = 0x05;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (c == '.')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) space = (c == ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (space)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (opts->name_check == 's' && len && c != '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) c = *name++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (c != '.')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) while (c != '.' && len--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) c = *name++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (c == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) while (walk - res < 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) *walk++ = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) while (len > 0 && walk - res < MSDOS_NAME) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) c = *name++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (opts->name_check != 'r' && strchr(bad_chars, c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (opts->name_check == 's' &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) strchr(bad_if_strict, c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (c < ' ' || c == ':' || c == '\\')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (c == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (opts->name_check == 's')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) space = c == ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (!opts->nocase && c >= 'a' && c <= 'z')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) *walk++ = c - 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) *walk++ = c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (space)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (opts->name_check == 's' && len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) while (walk - res < MSDOS_NAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) *walk++ = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /***** Locates a directory entry. Uses unformatted name. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static int msdos_find(struct inode *dir, const unsigned char *name, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct fat_slot_info *sinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) unsigned char msdos_name[MSDOS_NAME];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) err = msdos_format_name(name, len, msdos_name, &sbi->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) err = fat_scan(dir, msdos_name, sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (!err && sbi->options.dotsOK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (name[0] == '.') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (!(sinfo->de->attr & ATTR_HIDDEN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (sinfo->de->attr & ATTR_HIDDEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) brelse(sinfo->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * Compute the hash for the msdos name corresponding to the dentry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * Note: if the name is invalid, we leave the hash code unchanged so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * that the existing dentry can be used. The msdos fs routines will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) * return ENOENT or EINVAL as appropriate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static int msdos_hash(const struct dentry *dentry, struct qstr *qstr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) unsigned char msdos_name[MSDOS_NAME];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) error = msdos_format_name(qstr->name, qstr->len, msdos_name, options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) qstr->hash = full_name_hash(dentry, msdos_name, MSDOS_NAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * Compare two msdos names. If either of the names are invalid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * we fall back to doing the standard name comparison.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int msdos_cmp(const struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) unsigned int len, const char *str, const struct qstr *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) error = msdos_format_name(name->name, name->len, a_msdos_name, options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) goto old_compare;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) error = msdos_format_name(str, len, b_msdos_name, options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) goto old_compare;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) old_compare:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) error = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (name->len == len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) error = memcmp(name->name, str, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static const struct dentry_operations msdos_dentry_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) .d_hash = msdos_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .d_compare = msdos_cmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * AV. Wrappers for FAT sb operations. Is it wise?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /***** Get inode using directory and name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct super_block *sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) struct fat_slot_info sinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) mutex_lock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) switch (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) case -ENOENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) brelse(sinfo.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) inode = ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) mutex_unlock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) return d_splice_alias(inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /***** Creates a directory entry (name is already formatted). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static int msdos_add_entry(struct inode *dir, const unsigned char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) int is_dir, int is_hid, int cluster,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) struct timespec64 *ts, struct fat_slot_info *sinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) struct msdos_dir_entry de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) __le16 time, date;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) memcpy(de.name, name, MSDOS_NAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) de.attr = is_dir ? ATTR_DIR : ATTR_ARCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (is_hid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) de.attr |= ATTR_HIDDEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) de.lcase = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) fat_time_unix2fat(sbi, ts, &time, &date, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) de.cdate = de.adate = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) de.ctime = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) de.ctime_cs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) de.time = time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) de.date = date;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) fat_set_start(&de, cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) de.size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) err = fat_add_entries(dir, &de, 1, sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) fat_truncate_time(dir, ts, S_CTIME|S_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (IS_DIRSYNC(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) (void)fat_sync_inode(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) mark_inode_dirty(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) /***** Create a file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) bool excl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) struct super_block *sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct inode *inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) struct fat_slot_info sinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct timespec64 ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) unsigned char msdos_name[MSDOS_NAME];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) int err, is_hid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) mutex_lock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) msdos_name, &MSDOS_SB(sb)->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /* Have to do it due to foo vs. .foo conflicts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (!fat_scan(dir, msdos_name, &sinfo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) brelse(sinfo.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) ts = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) brelse(sinfo.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) /* timestamp is already written, so mark_inode_dirty() is unneeded. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) mutex_unlock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) err = fat_flush_inodes(sb, dir, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /***** Remove a directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct super_block *sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) struct fat_slot_info sinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) mutex_lock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) err = fat_dir_empty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) err = fat_remove_entries(dir, &sinfo); /* and releases bh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) drop_nlink(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) fat_truncate_time(inode, NULL, S_CTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) fat_detach(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) mutex_unlock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) err = fat_flush_inodes(sb, dir, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /***** Make a directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) struct super_block *sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) struct fat_slot_info sinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) unsigned char msdos_name[MSDOS_NAME];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct timespec64 ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) int err, is_hid, cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) mutex_lock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) msdos_name, &MSDOS_SB(sb)->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) /* foo vs .foo situation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (!fat_scan(dir, msdos_name, &sinfo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) brelse(sinfo.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) ts = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) cluster = fat_alloc_new_dir(dir, &ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) if (cluster < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) err = cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) inc_nlink(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) brelse(sinfo.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) /* the directory was completed, just return a error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) set_nlink(inode, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /* timestamp is already written, so mark_inode_dirty() is unneeded. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) mutex_unlock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) fat_flush_inodes(sb, dir, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) fat_free_clusters(dir, cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) mutex_unlock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) /***** Unlink a file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) static int msdos_unlink(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) struct fat_slot_info sinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) mutex_lock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) err = fat_remove_entries(dir, &sinfo); /* and releases bh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) fat_truncate_time(inode, NULL, S_CTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) fat_detach(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) mutex_unlock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) err = fat_flush_inodes(sb, dir, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) struct inode *new_dir, unsigned char *new_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) struct dentry *new_dentry, int is_hid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) struct buffer_head *dotdot_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) struct msdos_dir_entry *dotdot_de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) struct inode *old_inode, *new_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) struct fat_slot_info old_sinfo, sinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) struct timespec64 ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) loff_t new_i_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) int err, old_attrs, is_dir, update_dotdot, corrupt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) old_inode = d_inode(old_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) new_inode = d_inode(new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) err = fat_scan(old_dir, old_name, &old_sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) is_dir = S_ISDIR(old_inode->i_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) update_dotdot = (is_dir && old_dir != new_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) if (update_dotdot) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) old_attrs = MSDOS_I(old_inode)->i_attrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) err = fat_scan(new_dir, new_name, &sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (!new_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (sinfo.de != old_sinfo.de) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (is_hid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (IS_DIRSYNC(old_dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) err = fat_sync_inode(old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) MSDOS_I(old_inode)->i_attrs = old_attrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) mark_inode_dirty(old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) inode_inc_iversion(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) fat_truncate_time(old_dir, NULL, S_CTIME|S_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (IS_DIRSYNC(old_dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) (void)fat_sync_inode(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) mark_inode_dirty(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) ts = current_time(old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) if (new_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) if (is_dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) err = fat_dir_empty(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) new_i_pos = MSDOS_I(new_inode)->i_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) fat_detach(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) &ts, &sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) new_i_pos = sinfo.i_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) inode_inc_iversion(new_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) fat_detach(old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) fat_attach(old_inode, new_i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) if (is_hid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (IS_DIRSYNC(new_dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) err = fat_sync_inode(old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) goto error_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) mark_inode_dirty(old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (update_dotdot) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) mark_buffer_dirty_inode(dotdot_bh, old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (IS_DIRSYNC(new_dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) err = sync_dirty_buffer(dotdot_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) goto error_dotdot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) drop_nlink(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) if (!new_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) inc_nlink(new_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) old_sinfo.bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) goto error_dotdot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) inode_inc_iversion(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) fat_truncate_time(old_dir, &ts, S_CTIME|S_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (IS_DIRSYNC(old_dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) (void)fat_sync_inode(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) mark_inode_dirty(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (new_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) drop_nlink(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (is_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) drop_nlink(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) fat_truncate_time(new_inode, &ts, S_CTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) brelse(sinfo.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) brelse(dotdot_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) brelse(old_sinfo.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) error_dotdot:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) /* data cluster is shared, serious corruption */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) corrupt = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) if (update_dotdot) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) mark_buffer_dirty_inode(dotdot_bh, old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) corrupt |= sync_dirty_buffer(dotdot_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) error_inode:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) fat_detach(old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) fat_attach(old_inode, old_sinfo.i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) MSDOS_I(old_inode)->i_attrs = old_attrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) if (new_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) fat_attach(new_inode, new_i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) if (corrupt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) corrupt |= fat_sync_inode(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) * If new entry was not sharing the data cluster, it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) * shouldn't be serious corruption.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) int err2 = fat_remove_entries(new_dir, &sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) if (corrupt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) corrupt |= err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) sinfo.bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) if (corrupt < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) fat_fs_error(new_dir->i_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) "%s: Filesystem corrupted (i_pos %lld)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) __func__, sinfo.i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) struct inode *new_dir, struct dentry *new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) struct super_block *sb = old_dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) int err, is_hid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) if (flags & ~RENAME_NOREPLACE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) mutex_lock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) err = msdos_format_name(old_dentry->d_name.name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) old_dentry->d_name.len, old_msdos_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) &MSDOS_SB(old_dir->i_sb)->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) err = msdos_format_name(new_dentry->d_name.name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) new_dentry->d_name.len, new_msdos_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) &MSDOS_SB(new_dir->i_sb)->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) is_hid =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) err = do_msdos_rename(old_dir, old_msdos_name, old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) new_dir, new_msdos_name, new_dentry, is_hid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) mutex_unlock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) err = fat_flush_inodes(sb, old_dir, new_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) static const struct inode_operations msdos_dir_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) .create = msdos_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) .lookup = msdos_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) .unlink = msdos_unlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) .mkdir = msdos_mkdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) .rmdir = msdos_rmdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) .rename = msdos_rename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) .setattr = fat_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) .getattr = fat_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) .update_time = fat_update_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) static void setup(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) MSDOS_SB(sb)->dir_ops = &msdos_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) sb->s_d_op = &msdos_dentry_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) sb->s_flags |= SB_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) static int msdos_fill_super(struct super_block *sb, void *data, int silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) return fat_fill_super(sb, data, silent, 0, setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) static struct dentry *msdos_mount(struct file_system_type *fs_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) int flags, const char *dev_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) return mount_bdev(fs_type, flags, dev_name, data, msdos_fill_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) static struct file_system_type msdos_fs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) .name = "msdos",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) .mount = msdos_mount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) .kill_sb = kill_block_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) .fs_flags = FS_REQUIRES_DEV,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) MODULE_ALIAS_FS("msdos");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) static int __init init_msdos_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) return register_filesystem(&msdos_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) static void __exit exit_msdos_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) unregister_filesystem(&msdos_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) MODULE_AUTHOR("Werner Almesberger");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) MODULE_DESCRIPTION("MS-DOS filesystem support");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) module_init(init_msdos_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) module_exit(exit_msdos_fs)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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