Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/msdos/namei.c |
| 3 | * |
| 4 | * Written 1992,1993 by Werner Almesberger |
| 5 | * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu> |
| 6 | * Rewritten for constant inumbers 1999 by Al Viro |
| 7 | */ |
| 8 | |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/time.h> |
| 11 | #include <linux/buffer_head.h> |
| 12 | #include <linux/msdos_fs.h> |
| 13 | #include <linux/smp_lock.h> |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | /* Characters that are undesirable in an MS-DOS file name */ |
| 16 | static unsigned char bad_chars[] = "*?<>|\""; |
Rene Scharfe | 7557bc6 | 2008-07-25 01:46:45 -0700 | [diff] [blame] | 17 | static unsigned char bad_if_strict[] = "+=,; "; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | /***** Formats an MS-DOS file name. Rejects invalid names. */ |
| 20 | static int msdos_format_name(const unsigned char *name, int len, |
| 21 | unsigned char *res, struct fat_mount_options *opts) |
| 22 | /* |
| 23 | * name is the proposed name, len is its length, res is |
| 24 | * the resulting name, opts->name_check is either (r)elaxed, |
| 25 | * (n)ormal or (s)trict, opts->dotsOK allows dots at the |
| 26 | * beginning of name (for hidden files) |
| 27 | */ |
| 28 | { |
| 29 | unsigned char *walk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | unsigned char c; |
| 31 | int space; |
| 32 | |
| 33 | if (name[0] == '.') { /* dotfile because . and .. already done */ |
| 34 | if (opts->dotsOK) { |
| 35 | /* Get rid of dot - test for it elsewhere */ |
| 36 | name++; |
| 37 | len--; |
Rene Scharfe | 7557bc6 | 2008-07-25 01:46:45 -0700 | [diff] [blame] | 38 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | return -EINVAL; |
| 40 | } |
| 41 | /* |
Rene Scharfe | 7557bc6 | 2008-07-25 01:46:45 -0700 | [diff] [blame] | 42 | * disallow names that _really_ start with a dot |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | */ |
Rene Scharfe | 7557bc6 | 2008-07-25 01:46:45 -0700 | [diff] [blame] | 44 | space = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | c = 0; |
| 46 | for (walk = res; len && walk - res < 8; walk++) { |
| 47 | c = *name++; |
| 48 | len--; |
| 49 | if (opts->name_check != 'r' && strchr(bad_chars, c)) |
| 50 | return -EINVAL; |
Rene Scharfe | 7557bc6 | 2008-07-25 01:46:45 -0700 | [diff] [blame] | 51 | if (opts->name_check == 's' && strchr(bad_if_strict, c)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | return -EINVAL; |
| 53 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') |
| 54 | return -EINVAL; |
| 55 | if (c < ' ' || c == ':' || c == '\\') |
| 56 | return -EINVAL; |
| 57 | /* |
| 58 | * 0xE5 is legal as a first character, but we must substitute |
| 59 | * 0x05 because 0xE5 marks deleted files. Yes, DOS really |
| 60 | * does this. |
| 61 | * It seems that Microsoft hacked DOS to support non-US |
| 62 | * characters after the 0xE5 character was already in use to |
| 63 | * mark deleted files. |
| 64 | */ |
| 65 | if ((res == walk) && (c == 0xE5)) |
| 66 | c = 0x05; |
| 67 | if (c == '.') |
| 68 | break; |
| 69 | space = (c == ' '); |
| 70 | *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c; |
| 71 | } |
| 72 | if (space) |
| 73 | return -EINVAL; |
| 74 | if (opts->name_check == 's' && len && c != '.') { |
| 75 | c = *name++; |
| 76 | len--; |
| 77 | if (c != '.') |
| 78 | return -EINVAL; |
| 79 | } |
| 80 | while (c != '.' && len--) |
| 81 | c = *name++; |
| 82 | if (c == '.') { |
| 83 | while (walk - res < 8) |
| 84 | *walk++ = ' '; |
| 85 | while (len > 0 && walk - res < MSDOS_NAME) { |
| 86 | c = *name++; |
| 87 | len--; |
| 88 | if (opts->name_check != 'r' && strchr(bad_chars, c)) |
| 89 | return -EINVAL; |
| 90 | if (opts->name_check == 's' && |
Rene Scharfe | 7557bc6 | 2008-07-25 01:46:45 -0700 | [diff] [blame] | 91 | strchr(bad_if_strict, c)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | return -EINVAL; |
| 93 | if (c < ' ' || c == ':' || c == '\\') |
| 94 | return -EINVAL; |
| 95 | if (c == '.') { |
| 96 | if (opts->name_check == 's') |
| 97 | return -EINVAL; |
| 98 | break; |
| 99 | } |
| 100 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') |
| 101 | return -EINVAL; |
| 102 | space = c == ' '; |
| 103 | if (!opts->nocase && c >= 'a' && c <= 'z') |
| 104 | *walk++ = c - 32; |
| 105 | else |
| 106 | *walk++ = c; |
| 107 | } |
| 108 | if (space) |
| 109 | return -EINVAL; |
| 110 | if (opts->name_check == 's' && len) |
| 111 | return -EINVAL; |
| 112 | } |
| 113 | while (walk - res < MSDOS_NAME) |
| 114 | *walk++ = ' '; |
OGAWA Hirofumi | 094e320 | 2006-03-31 02:30:53 -0800 | [diff] [blame] | 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | /***** Locates a directory entry. Uses unformatted name. */ |
| 120 | static int msdos_find(struct inode *dir, const unsigned char *name, int len, |
| 121 | struct fat_slot_info *sinfo) |
| 122 | { |
| 123 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
| 124 | unsigned char msdos_name[MSDOS_NAME]; |
| 125 | int err; |
| 126 | |
| 127 | err = msdos_format_name(name, len, msdos_name, &sbi->options); |
| 128 | if (err) |
| 129 | return -ENOENT; |
| 130 | |
| 131 | err = fat_scan(dir, msdos_name, sinfo); |
| 132 | if (!err && sbi->options.dotsOK) { |
| 133 | if (name[0] == '.') { |
| 134 | if (!(sinfo->de->attr & ATTR_HIDDEN)) |
| 135 | err = -ENOENT; |
| 136 | } else { |
| 137 | if (sinfo->de->attr & ATTR_HIDDEN) |
| 138 | err = -ENOENT; |
| 139 | } |
| 140 | if (err) |
| 141 | brelse(sinfo->bh); |
| 142 | } |
| 143 | return err; |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * Compute the hash for the msdos name corresponding to the dentry. |
| 148 | * Note: if the name is invalid, we leave the hash code unchanged so |
| 149 | * that the existing dentry can be used. The msdos fs routines will |
| 150 | * return ENOENT or EINVAL as appropriate. |
| 151 | */ |
| 152 | static int msdos_hash(struct dentry *dentry, struct qstr *qstr) |
| 153 | { |
| 154 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; |
| 155 | unsigned char msdos_name[MSDOS_NAME]; |
| 156 | int error; |
| 157 | |
| 158 | error = msdos_format_name(qstr->name, qstr->len, msdos_name, options); |
| 159 | if (!error) |
| 160 | qstr->hash = full_name_hash(msdos_name, MSDOS_NAME); |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Compare two msdos names. If either of the names are invalid, |
| 166 | * we fall back to doing the standard name comparison. |
| 167 | */ |
| 168 | static int msdos_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b) |
| 169 | { |
| 170 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; |
| 171 | unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME]; |
| 172 | int error; |
| 173 | |
| 174 | error = msdos_format_name(a->name, a->len, a_msdos_name, options); |
| 175 | if (error) |
| 176 | goto old_compare; |
| 177 | error = msdos_format_name(b->name, b->len, b_msdos_name, options); |
| 178 | if (error) |
| 179 | goto old_compare; |
| 180 | error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME); |
| 181 | out: |
| 182 | return error; |
| 183 | |
| 184 | old_compare: |
| 185 | error = 1; |
| 186 | if (a->len == b->len) |
| 187 | error = memcmp(a->name, b->name, a->len); |
| 188 | goto out; |
| 189 | } |
| 190 | |
| 191 | static struct dentry_operations msdos_dentry_operations = { |
| 192 | .d_hash = msdos_hash, |
| 193 | .d_compare = msdos_cmp, |
| 194 | }; |
| 195 | |
| 196 | /* |
| 197 | * AV. Wrappers for FAT sb operations. Is it wise? |
| 198 | */ |
| 199 | |
| 200 | /***** Get inode using directory and name */ |
| 201 | static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry, |
| 202 | struct nameidata *nd) |
| 203 | { |
| 204 | struct super_block *sb = dir->i_sb; |
| 205 | struct fat_slot_info sinfo; |
| 206 | struct inode *inode = NULL; |
| 207 | int res; |
| 208 | |
| 209 | dentry->d_op = &msdos_dentry_operations; |
| 210 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 211 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
| 213 | if (res == -ENOENT) |
| 214 | goto add; |
| 215 | if (res < 0) |
| 216 | goto out; |
| 217 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
| 218 | brelse(sinfo.bh); |
| 219 | if (IS_ERR(inode)) { |
| 220 | res = PTR_ERR(inode); |
| 221 | goto out; |
| 222 | } |
| 223 | add: |
| 224 | res = 0; |
| 225 | dentry = d_splice_alias(inode, dentry); |
| 226 | if (dentry) |
| 227 | dentry->d_op = &msdos_dentry_operations; |
| 228 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 229 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | if (!res) |
| 231 | return dentry; |
| 232 | return ERR_PTR(res); |
| 233 | } |
| 234 | |
| 235 | /***** Creates a directory entry (name is already formatted). */ |
| 236 | static int msdos_add_entry(struct inode *dir, const unsigned char *name, |
| 237 | int is_dir, int is_hid, int cluster, |
| 238 | struct timespec *ts, struct fat_slot_info *sinfo) |
| 239 | { |
Joe Peterson | b271e06 | 2008-07-25 01:46:47 -0700 | [diff] [blame] | 240 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | struct msdos_dir_entry de; |
| 242 | __le16 time, date; |
| 243 | int err; |
| 244 | |
| 245 | memcpy(de.name, name, MSDOS_NAME); |
| 246 | de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; |
| 247 | if (is_hid) |
| 248 | de.attr |= ATTR_HIDDEN; |
| 249 | de.lcase = 0; |
Joe Peterson | b271e06 | 2008-07-25 01:46:47 -0700 | [diff] [blame] | 250 | fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | de.cdate = de.adate = 0; |
| 252 | de.ctime = 0; |
| 253 | de.ctime_cs = 0; |
| 254 | de.time = time; |
| 255 | de.date = date; |
| 256 | de.start = cpu_to_le16(cluster); |
| 257 | de.starthi = cpu_to_le16(cluster >> 16); |
| 258 | de.size = 0; |
| 259 | |
| 260 | err = fat_add_entries(dir, &de, 1, sinfo); |
| 261 | if (err) |
| 262 | return err; |
| 263 | |
| 264 | dir->i_ctime = dir->i_mtime = *ts; |
| 265 | if (IS_DIRSYNC(dir)) |
| 266 | (void)fat_sync_inode(dir); |
| 267 | else |
| 268 | mark_inode_dirty(dir); |
| 269 | |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | /***** Create a file */ |
| 274 | static int msdos_create(struct inode *dir, struct dentry *dentry, int mode, |
| 275 | struct nameidata *nd) |
| 276 | { |
| 277 | struct super_block *sb = dir->i_sb; |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 278 | struct inode *inode = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | struct fat_slot_info sinfo; |
| 280 | struct timespec ts; |
| 281 | unsigned char msdos_name[MSDOS_NAME]; |
| 282 | int err, is_hid; |
| 283 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 284 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, |
| 287 | msdos_name, &MSDOS_SB(sb)->options); |
| 288 | if (err) |
| 289 | goto out; |
| 290 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); |
| 291 | /* Have to do it due to foo vs. .foo conflicts */ |
| 292 | if (!fat_scan(dir, msdos_name, &sinfo)) { |
| 293 | brelse(sinfo.bh); |
| 294 | err = -EINVAL; |
| 295 | goto out; |
| 296 | } |
| 297 | |
| 298 | ts = CURRENT_TIME_SEC; |
| 299 | err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); |
| 300 | if (err) |
| 301 | goto out; |
| 302 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
| 303 | brelse(sinfo.bh); |
| 304 | if (IS_ERR(inode)) { |
| 305 | err = PTR_ERR(inode); |
| 306 | goto out; |
| 307 | } |
| 308 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; |
| 309 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
| 310 | |
| 311 | d_instantiate(dentry, inode); |
| 312 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 313 | unlock_super(sb); |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 314 | if (!err) |
| 315 | err = fat_flush_inodes(sb, dir, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | return err; |
| 317 | } |
| 318 | |
| 319 | /***** Remove a directory */ |
| 320 | static int msdos_rmdir(struct inode *dir, struct dentry *dentry) |
| 321 | { |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 322 | struct super_block *sb = dir->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | struct inode *inode = dentry->d_inode; |
| 324 | struct fat_slot_info sinfo; |
| 325 | int err; |
| 326 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 327 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | /* |
| 329 | * Check whether the directory is not in use, then check |
| 330 | * whether it is empty. |
| 331 | */ |
| 332 | err = fat_dir_empty(inode); |
| 333 | if (err) |
| 334 | goto out; |
| 335 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
| 336 | if (err) |
| 337 | goto out; |
| 338 | |
| 339 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ |
| 340 | if (err) |
| 341 | goto out; |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 342 | drop_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 344 | clear_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | inode->i_ctime = CURRENT_TIME_SEC; |
| 346 | fat_detach(inode); |
| 347 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 348 | unlock_super(sb); |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 349 | if (!err) |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 350 | err = fat_flush_inodes(sb, dir, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
| 352 | return err; |
| 353 | } |
| 354 | |
| 355 | /***** Make a directory */ |
| 356 | static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 357 | { |
| 358 | struct super_block *sb = dir->i_sb; |
| 359 | struct fat_slot_info sinfo; |
| 360 | struct inode *inode; |
| 361 | unsigned char msdos_name[MSDOS_NAME]; |
| 362 | struct timespec ts; |
| 363 | int err, is_hid, cluster; |
| 364 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 365 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
| 367 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, |
| 368 | msdos_name, &MSDOS_SB(sb)->options); |
| 369 | if (err) |
| 370 | goto out; |
| 371 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); |
| 372 | /* foo vs .foo situation */ |
| 373 | if (!fat_scan(dir, msdos_name, &sinfo)) { |
| 374 | brelse(sinfo.bh); |
| 375 | err = -EINVAL; |
| 376 | goto out; |
| 377 | } |
| 378 | |
| 379 | ts = CURRENT_TIME_SEC; |
| 380 | cluster = fat_alloc_new_dir(dir, &ts); |
| 381 | if (cluster < 0) { |
| 382 | err = cluster; |
| 383 | goto out; |
| 384 | } |
| 385 | err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo); |
| 386 | if (err) |
| 387 | goto out_free; |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 388 | inc_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
| 390 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
| 391 | brelse(sinfo.bh); |
| 392 | if (IS_ERR(inode)) { |
| 393 | err = PTR_ERR(inode); |
| 394 | /* the directory was completed, just return a error */ |
| 395 | goto out; |
| 396 | } |
| 397 | inode->i_nlink = 2; |
| 398 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; |
| 399 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
| 400 | |
| 401 | d_instantiate(dentry, inode); |
| 402 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 403 | unlock_super(sb); |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 404 | fat_flush_inodes(sb, dir, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | return 0; |
| 406 | |
| 407 | out_free: |
| 408 | fat_free_clusters(dir, cluster); |
| 409 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 410 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | return err; |
| 412 | } |
| 413 | |
| 414 | /***** Unlink a file */ |
| 415 | static int msdos_unlink(struct inode *dir, struct dentry *dentry) |
| 416 | { |
| 417 | struct inode *inode = dentry->d_inode; |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 418 | struct super_block *sb= inode->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | struct fat_slot_info sinfo; |
| 420 | int err; |
| 421 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 422 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
| 424 | if (err) |
| 425 | goto out; |
| 426 | |
| 427 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ |
| 428 | if (err) |
| 429 | goto out; |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 430 | clear_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | inode->i_ctime = CURRENT_TIME_SEC; |
| 432 | fat_detach(inode); |
| 433 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 434 | unlock_super(sb); |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 435 | if (!err) |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 436 | err = fat_flush_inodes(sb, dir, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | return err; |
| 439 | } |
| 440 | |
| 441 | static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, |
| 442 | struct dentry *old_dentry, |
| 443 | struct inode *new_dir, unsigned char *new_name, |
| 444 | struct dentry *new_dentry, int is_hid) |
| 445 | { |
| 446 | struct buffer_head *dotdot_bh; |
| 447 | struct msdos_dir_entry *dotdot_de; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | struct inode *old_inode, *new_inode; |
| 449 | struct fat_slot_info old_sinfo, sinfo; |
| 450 | struct timespec ts; |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 451 | loff_t dotdot_i_pos, new_i_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | int err, old_attrs, is_dir, update_dotdot, corrupt = 0; |
| 453 | |
| 454 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; |
| 455 | old_inode = old_dentry->d_inode; |
| 456 | new_inode = new_dentry->d_inode; |
| 457 | |
| 458 | err = fat_scan(old_dir, old_name, &old_sinfo); |
| 459 | if (err) { |
| 460 | err = -EIO; |
| 461 | goto out; |
| 462 | } |
| 463 | |
| 464 | is_dir = S_ISDIR(old_inode->i_mode); |
| 465 | update_dotdot = (is_dir && old_dir != new_dir); |
| 466 | if (update_dotdot) { |
| 467 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de, |
| 468 | &dotdot_i_pos) < 0) { |
| 469 | err = -EIO; |
| 470 | goto out; |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | old_attrs = MSDOS_I(old_inode)->i_attrs; |
| 475 | err = fat_scan(new_dir, new_name, &sinfo); |
| 476 | if (!err) { |
| 477 | if (!new_inode) { |
| 478 | /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ |
| 479 | if (sinfo.de != old_sinfo.de) { |
| 480 | err = -EINVAL; |
| 481 | goto out; |
| 482 | } |
| 483 | if (is_hid) |
| 484 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; |
| 485 | else |
| 486 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; |
| 487 | if (IS_DIRSYNC(old_dir)) { |
| 488 | err = fat_sync_inode(old_inode); |
| 489 | if (err) { |
| 490 | MSDOS_I(old_inode)->i_attrs = old_attrs; |
| 491 | goto out; |
| 492 | } |
| 493 | } else |
| 494 | mark_inode_dirty(old_inode); |
| 495 | |
| 496 | old_dir->i_version++; |
| 497 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC; |
| 498 | if (IS_DIRSYNC(old_dir)) |
| 499 | (void)fat_sync_inode(old_dir); |
| 500 | else |
| 501 | mark_inode_dirty(old_dir); |
| 502 | goto out; |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | ts = CURRENT_TIME_SEC; |
| 507 | if (new_inode) { |
| 508 | if (err) |
| 509 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | if (is_dir) { |
| 511 | err = fat_dir_empty(new_inode); |
| 512 | if (err) |
| 513 | goto out; |
| 514 | } |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 515 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | fat_detach(new_inode); |
| 517 | } else { |
| 518 | err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, |
| 519 | &ts, &sinfo); |
| 520 | if (err) |
| 521 | goto out; |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 522 | new_i_pos = sinfo.i_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | } |
| 524 | new_dir->i_version++; |
| 525 | |
| 526 | fat_detach(old_inode); |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 527 | fat_attach(old_inode, new_i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | if (is_hid) |
| 529 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; |
| 530 | else |
| 531 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; |
| 532 | if (IS_DIRSYNC(new_dir)) { |
| 533 | err = fat_sync_inode(old_inode); |
| 534 | if (err) |
| 535 | goto error_inode; |
| 536 | } else |
| 537 | mark_inode_dirty(old_inode); |
| 538 | |
| 539 | if (update_dotdot) { |
| 540 | int start = MSDOS_I(new_dir)->i_logstart; |
| 541 | dotdot_de->start = cpu_to_le16(start); |
| 542 | dotdot_de->starthi = cpu_to_le16(start >> 16); |
| 543 | mark_buffer_dirty(dotdot_bh); |
| 544 | if (IS_DIRSYNC(new_dir)) { |
| 545 | err = sync_dirty_buffer(dotdot_bh); |
| 546 | if (err) |
| 547 | goto error_dotdot; |
| 548 | } |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 549 | drop_nlink(old_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | if (!new_inode) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 551 | inc_nlink(new_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ |
| 555 | old_sinfo.bh = NULL; |
| 556 | if (err) |
| 557 | goto error_dotdot; |
| 558 | old_dir->i_version++; |
| 559 | old_dir->i_ctime = old_dir->i_mtime = ts; |
| 560 | if (IS_DIRSYNC(old_dir)) |
| 561 | (void)fat_sync_inode(old_dir); |
| 562 | else |
| 563 | mark_inode_dirty(old_dir); |
| 564 | |
| 565 | if (new_inode) { |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 566 | drop_nlink(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | if (is_dir) |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 568 | drop_nlink(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | new_inode->i_ctime = ts; |
| 570 | } |
| 571 | out: |
| 572 | brelse(sinfo.bh); |
| 573 | brelse(dotdot_bh); |
| 574 | brelse(old_sinfo.bh); |
| 575 | return err; |
| 576 | |
| 577 | error_dotdot: |
| 578 | /* data cluster is shared, serious corruption */ |
| 579 | corrupt = 1; |
| 580 | |
| 581 | if (update_dotdot) { |
| 582 | int start = MSDOS_I(old_dir)->i_logstart; |
| 583 | dotdot_de->start = cpu_to_le16(start); |
| 584 | dotdot_de->starthi = cpu_to_le16(start >> 16); |
| 585 | mark_buffer_dirty(dotdot_bh); |
| 586 | corrupt |= sync_dirty_buffer(dotdot_bh); |
| 587 | } |
| 588 | error_inode: |
| 589 | fat_detach(old_inode); |
| 590 | fat_attach(old_inode, old_sinfo.i_pos); |
| 591 | MSDOS_I(old_inode)->i_attrs = old_attrs; |
| 592 | if (new_inode) { |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 593 | fat_attach(new_inode, new_i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | if (corrupt) |
| 595 | corrupt |= fat_sync_inode(new_inode); |
| 596 | } else { |
| 597 | /* |
| 598 | * If new entry was not sharing the data cluster, it |
| 599 | * shouldn't be serious corruption. |
| 600 | */ |
| 601 | int err2 = fat_remove_entries(new_dir, &sinfo); |
| 602 | if (corrupt) |
| 603 | corrupt |= err2; |
| 604 | sinfo.bh = NULL; |
| 605 | } |
| 606 | if (corrupt < 0) { |
| 607 | fat_fs_panic(new_dir->i_sb, |
| 608 | "%s: Filesystem corrupted (i_pos %lld)", |
Harvey Harrison | 8e24eea | 2008-04-30 00:55:09 -0700 | [diff] [blame] | 609 | __func__, sinfo.i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | } |
| 611 | goto out; |
| 612 | } |
| 613 | |
| 614 | /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */ |
| 615 | static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 616 | struct inode *new_dir, struct dentry *new_dentry) |
| 617 | { |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 618 | struct super_block *sb = old_dir->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; |
| 620 | int err, is_hid; |
| 621 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 622 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
| 624 | err = msdos_format_name(old_dentry->d_name.name, |
| 625 | old_dentry->d_name.len, old_msdos_name, |
| 626 | &MSDOS_SB(old_dir->i_sb)->options); |
| 627 | if (err) |
| 628 | goto out; |
| 629 | err = msdos_format_name(new_dentry->d_name.name, |
| 630 | new_dentry->d_name.len, new_msdos_name, |
| 631 | &MSDOS_SB(new_dir->i_sb)->options); |
| 632 | if (err) |
| 633 | goto out; |
| 634 | |
| 635 | is_hid = |
| 636 | (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.'); |
| 637 | |
| 638 | err = do_msdos_rename(old_dir, old_msdos_name, old_dentry, |
| 639 | new_dir, new_msdos_name, new_dentry, is_hid); |
| 640 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 641 | unlock_super(sb); |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 642 | if (!err) |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 643 | err = fat_flush_inodes(sb, old_dir, new_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | return err; |
| 645 | } |
| 646 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 647 | static const struct inode_operations msdos_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | .create = msdos_create, |
| 649 | .lookup = msdos_lookup, |
| 650 | .unlink = msdos_unlink, |
| 651 | .mkdir = msdos_mkdir, |
| 652 | .rmdir = msdos_rmdir, |
| 653 | .rename = msdos_rename, |
OGAWA Hirofumi | 1278fdd | 2008-04-28 02:16:25 -0700 | [diff] [blame] | 654 | .setattr = fat_setattr, |
OGAWA Hirofumi | da63fc7 | 2006-11-16 01:19:28 -0800 | [diff] [blame] | 655 | .getattr = fat_getattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | }; |
| 657 | |
| 658 | static int msdos_fill_super(struct super_block *sb, void *data, int silent) |
| 659 | { |
| 660 | int res; |
| 661 | |
| 662 | res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0); |
| 663 | if (res) |
| 664 | return res; |
| 665 | |
| 666 | sb->s_flags |= MS_NOATIME; |
| 667 | sb->s_root->d_op = &msdos_dentry_operations; |
| 668 | return 0; |
| 669 | } |
| 670 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 671 | static int msdos_get_sb(struct file_system_type *fs_type, |
| 672 | int flags, const char *dev_name, |
| 673 | void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 675 | return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super, |
| 676 | mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | } |
| 678 | |
| 679 | static struct file_system_type msdos_fs_type = { |
| 680 | .owner = THIS_MODULE, |
| 681 | .name = "msdos", |
| 682 | .get_sb = msdos_get_sb, |
| 683 | .kill_sb = kill_block_super, |
| 684 | .fs_flags = FS_REQUIRES_DEV, |
| 685 | }; |
| 686 | |
| 687 | static int __init init_msdos_fs(void) |
| 688 | { |
| 689 | return register_filesystem(&msdos_fs_type); |
| 690 | } |
| 691 | |
| 692 | static void __exit exit_msdos_fs(void) |
| 693 | { |
| 694 | unregister_filesystem(&msdos_fs_type); |
| 695 | } |
| 696 | |
| 697 | MODULE_LICENSE("GPL"); |
| 698 | MODULE_AUTHOR("Werner Almesberger"); |
| 699 | MODULE_DESCRIPTION("MS-DOS filesystem support"); |
| 700 | |
| 701 | module_init(init_msdos_fs) |
| 702 | module_exit(exit_msdos_fs) |