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