Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/hpfs/super.c
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1 /* 2 * linux/fs/hpfs/super.c 3 * 4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 5 * 6 * mounting, unmounting, error handling 7 */ 8 9 #include "hpfs_fn.h" 10 #include <linux/module.h> 11 #include <linux/parser.h> 12 #include <linux/init.h> 13 #include <linux/statfs.h> 14 #include <linux/magic.h> 15 #include <linux/sched.h> 16 #include <linux/bitmap.h> 17 #include <linux/slab.h> 18 19 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ 20 21 static void mark_dirty(struct super_block *s, int remount) 22 { 23 if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) { 24 struct buffer_head *bh; 25 struct hpfs_spare_block *sb; 26 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 27 sb->dirty = 1; 28 sb->old_wrote = 0; 29 mark_buffer_dirty(bh); 30 sync_dirty_buffer(bh); 31 brelse(bh); 32 } 33 } 34 } 35 36 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there 37 were errors) */ 38 39 static void unmark_dirty(struct super_block *s) 40 { 41 struct buffer_head *bh; 42 struct hpfs_spare_block *sb; 43 if (s->s_flags & MS_RDONLY) return; 44 sync_blockdev(s->s_bdev); 45 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 46 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error; 47 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error; 48 mark_buffer_dirty(bh); 49 sync_dirty_buffer(bh); 50 brelse(bh); 51 } 52 } 53 54 /* Filesystem error... */ 55 static char err_buf[1024]; 56 57 void hpfs_error(struct super_block *s, const char *fmt, ...) 58 { 59 va_list args; 60 61 va_start(args, fmt); 62 vsnprintf(err_buf, sizeof(err_buf), fmt, args); 63 va_end(args); 64 65 printk("HPFS: filesystem error: %s", err_buf); 66 if (!hpfs_sb(s)->sb_was_error) { 67 if (hpfs_sb(s)->sb_err == 2) { 68 printk("; crashing the system because you wanted it\n"); 69 mark_dirty(s, 0); 70 panic("HPFS panic"); 71 } else if (hpfs_sb(s)->sb_err == 1) { 72 if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n"); 73 else { 74 printk("; remounting read-only\n"); 75 mark_dirty(s, 0); 76 s->s_flags |= MS_RDONLY; 77 } 78 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n"); 79 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); 80 } else printk("\n"); 81 hpfs_sb(s)->sb_was_error = 1; 82 } 83 84 /* 85 * A little trick to detect cycles in many hpfs structures and don't let the 86 * kernel crash on corrupted filesystem. When first called, set c2 to 0. 87 * 88 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories 89 * nested each in other, chkdsk locked up happilly. 90 */ 91 92 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, 93 char *msg) 94 { 95 if (*c2 && *c1 == key) { 96 hpfs_error(s, "cycle detected on key %08x in %s", key, msg); 97 return 1; 98 } 99 (*c2)++; 100 if (!((*c2 - 1) & *c2)) *c1 = key; 101 return 0; 102 } 103 104 static void hpfs_put_super(struct super_block *s) 105 { 106 struct hpfs_sb_info *sbi = hpfs_sb(s); 107 108 hpfs_lock(s); 109 unmark_dirty(s); 110 hpfs_unlock(s); 111 112 kfree(sbi->sb_cp_table); 113 kfree(sbi->sb_bmp_dir); 114 s->s_fs_info = NULL; 115 kfree(sbi); 116 } 117 118 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) 119 { 120 struct quad_buffer_head qbh; 121 unsigned long *bits; 122 unsigned count; 123 124 bits = hpfs_map_4sectors(s, secno, &qbh, 4); 125 if (!bits) 126 return 0; 127 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); 128 hpfs_brelse4(&qbh); 129 return count; 130 } 131 132 static unsigned count_bitmaps(struct super_block *s) 133 { 134 unsigned n, count, n_bands; 135 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; 136 count = 0; 137 for (n = 0; n < n_bands; n++) 138 count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); 139 return count; 140 } 141 142 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) 143 { 144 struct super_block *s = dentry->d_sb; 145 struct hpfs_sb_info *sbi = hpfs_sb(s); 146 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 147 hpfs_lock(s); 148 149 /*if (sbi->sb_n_free == -1) {*/ 150 sbi->sb_n_free = count_bitmaps(s); 151 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap); 152 /*}*/ 153 buf->f_type = s->s_magic; 154 buf->f_bsize = 512; 155 buf->f_blocks = sbi->sb_fs_size; 156 buf->f_bfree = sbi->sb_n_free; 157 buf->f_bavail = sbi->sb_n_free; 158 buf->f_files = sbi->sb_dirband_size / 4; 159 buf->f_ffree = sbi->sb_n_free_dnodes; 160 buf->f_fsid.val[0] = (u32)id; 161 buf->f_fsid.val[1] = (u32)(id >> 32); 162 buf->f_namelen = 254; 163 164 hpfs_unlock(s); 165 166 return 0; 167 } 168 169 static struct kmem_cache * hpfs_inode_cachep; 170 171 static struct inode *hpfs_alloc_inode(struct super_block *sb) 172 { 173 struct hpfs_inode_info *ei; 174 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); 175 if (!ei) 176 return NULL; 177 ei->vfs_inode.i_version = 1; 178 return &ei->vfs_inode; 179 } 180 181 static void hpfs_i_callback(struct rcu_head *head) 182 { 183 struct inode *inode = container_of(head, struct inode, i_rcu); 184 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); 185 } 186 187 static void hpfs_destroy_inode(struct inode *inode) 188 { 189 call_rcu(&inode->i_rcu, hpfs_i_callback); 190 } 191 192 static void init_once(void *foo) 193 { 194 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; 195 196 inode_init_once(&ei->vfs_inode); 197 } 198 199 static int init_inodecache(void) 200 { 201 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", 202 sizeof(struct hpfs_inode_info), 203 0, (SLAB_RECLAIM_ACCOUNT| 204 SLAB_MEM_SPREAD), 205 init_once); 206 if (hpfs_inode_cachep == NULL) 207 return -ENOMEM; 208 return 0; 209 } 210 211 static void destroy_inodecache(void) 212 { 213 /* 214 * Make sure all delayed rcu free inodes are flushed before we 215 * destroy cache. 216 */ 217 rcu_barrier(); 218 kmem_cache_destroy(hpfs_inode_cachep); 219 } 220 221 /* 222 * A tiny parser for option strings, stolen from dosfs. 223 * Stolen again from read-only hpfs. 224 * And updated for table-driven option parsing. 225 */ 226 227 enum { 228 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, 229 Opt_check_none, Opt_check_normal, Opt_check_strict, 230 Opt_err_cont, Opt_err_ro, Opt_err_panic, 231 Opt_eas_no, Opt_eas_ro, Opt_eas_rw, 232 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, 233 Opt_timeshift, Opt_err, 234 }; 235 236 static const match_table_t tokens = { 237 {Opt_help, "help"}, 238 {Opt_uid, "uid=%u"}, 239 {Opt_gid, "gid=%u"}, 240 {Opt_umask, "umask=%o"}, 241 {Opt_case_lower, "case=lower"}, 242 {Opt_case_asis, "case=asis"}, 243 {Opt_check_none, "check=none"}, 244 {Opt_check_normal, "check=normal"}, 245 {Opt_check_strict, "check=strict"}, 246 {Opt_err_cont, "errors=continue"}, 247 {Opt_err_ro, "errors=remount-ro"}, 248 {Opt_err_panic, "errors=panic"}, 249 {Opt_eas_no, "eas=no"}, 250 {Opt_eas_ro, "eas=ro"}, 251 {Opt_eas_rw, "eas=rw"}, 252 {Opt_chkdsk_no, "chkdsk=no"}, 253 {Opt_chkdsk_errors, "chkdsk=errors"}, 254 {Opt_chkdsk_always, "chkdsk=always"}, 255 {Opt_timeshift, "timeshift=%d"}, 256 {Opt_err, NULL}, 257 }; 258 259 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, 260 int *lowercase, int *eas, int *chk, int *errs, 261 int *chkdsk, int *timeshift) 262 { 263 char *p; 264 int option; 265 266 if (!opts) 267 return 1; 268 269 /*printk("Parsing opts: '%s'\n",opts);*/ 270 271 while ((p = strsep(&opts, ",")) != NULL) { 272 substring_t args[MAX_OPT_ARGS]; 273 int token; 274 if (!*p) 275 continue; 276 277 token = match_token(p, tokens, args); 278 switch (token) { 279 case Opt_help: 280 return 2; 281 case Opt_uid: 282 if (match_int(args, &option)) 283 return 0; 284 *uid = make_kuid(current_user_ns(), option); 285 if (!uid_valid(*uid)) 286 return 0; 287 break; 288 case Opt_gid: 289 if (match_int(args, &option)) 290 return 0; 291 *gid = make_kgid(current_user_ns(), option); 292 if (!gid_valid(*gid)) 293 return 0; 294 break; 295 case Opt_umask: 296 if (match_octal(args, &option)) 297 return 0; 298 *umask = option; 299 break; 300 case Opt_case_lower: 301 *lowercase = 1; 302 break; 303 case Opt_case_asis: 304 *lowercase = 0; 305 break; 306 case Opt_check_none: 307 *chk = 0; 308 break; 309 case Opt_check_normal: 310 *chk = 1; 311 break; 312 case Opt_check_strict: 313 *chk = 2; 314 break; 315 case Opt_err_cont: 316 *errs = 0; 317 break; 318 case Opt_err_ro: 319 *errs = 1; 320 break; 321 case Opt_err_panic: 322 *errs = 2; 323 break; 324 case Opt_eas_no: 325 *eas = 0; 326 break; 327 case Opt_eas_ro: 328 *eas = 1; 329 break; 330 case Opt_eas_rw: 331 *eas = 2; 332 break; 333 case Opt_chkdsk_no: 334 *chkdsk = 0; 335 break; 336 case Opt_chkdsk_errors: 337 *chkdsk = 1; 338 break; 339 case Opt_chkdsk_always: 340 *chkdsk = 2; 341 break; 342 case Opt_timeshift: 343 { 344 int m = 1; 345 char *rhs = args[0].from; 346 if (!rhs || !*rhs) 347 return 0; 348 if (*rhs == '-') m = -1; 349 if (*rhs == '+' || *rhs == '-') rhs++; 350 *timeshift = simple_strtoul(rhs, &rhs, 0) * m; 351 if (*rhs) 352 return 0; 353 break; 354 } 355 default: 356 return 0; 357 } 358 } 359 return 1; 360 } 361 362 static inline void hpfs_help(void) 363 { 364 printk("\n\ 365 HPFS filesystem options:\n\ 366 help do not mount and display this text\n\ 367 uid=xxx set uid of files that don't have uid specified in eas\n\ 368 gid=xxx set gid of files that don't have gid specified in eas\n\ 369 umask=xxx set mode of files that don't have mode specified in eas\n\ 370 case=lower lowercase all files\n\ 371 case=asis do not lowercase files (default)\n\ 372 check=none no fs checks - kernel may crash on corrupted filesystem\n\ 373 check=normal do some checks - it should not crash (default)\n\ 374 check=strict do extra time-consuming checks, used for debugging\n\ 375 errors=continue continue on errors\n\ 376 errors=remount-ro remount read-only if errors found (default)\n\ 377 errors=panic panic on errors\n\ 378 chkdsk=no do not mark fs for chkdsking even if there were errors\n\ 379 chkdsk=errors mark fs dirty if errors found (default)\n\ 380 chkdsk=always always mark fs dirty - used for debugging\n\ 381 eas=no ignore extended attributes\n\ 382 eas=ro read but do not write extended attributes\n\ 383 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ 384 timeshift=nnn add nnn seconds to file times\n\ 385 \n"); 386 } 387 388 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) 389 { 390 kuid_t uid; 391 kgid_t gid; 392 umode_t umask; 393 int lowercase, eas, chk, errs, chkdsk, timeshift; 394 int o; 395 struct hpfs_sb_info *sbi = hpfs_sb(s); 396 char *new_opts = kstrdup(data, GFP_KERNEL); 397 398 *flags |= MS_NOATIME; 399 400 hpfs_lock(s); 401 uid = sbi->sb_uid; gid = sbi->sb_gid; 402 umask = 0777 & ~sbi->sb_mode; 403 lowercase = sbi->sb_lowercase; 404 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; 405 errs = sbi->sb_err; timeshift = sbi->sb_timeshift; 406 407 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, 408 &eas, &chk, &errs, &chkdsk, ×hift))) { 409 printk("HPFS: bad mount options.\n"); 410 goto out_err; 411 } 412 if (o == 2) { 413 hpfs_help(); 414 goto out_err; 415 } 416 if (timeshift != sbi->sb_timeshift) { 417 printk("HPFS: timeshift can't be changed using remount.\n"); 418 goto out_err; 419 } 420 421 unmark_dirty(s); 422 423 sbi->sb_uid = uid; sbi->sb_gid = gid; 424 sbi->sb_mode = 0777 & ~umask; 425 sbi->sb_lowercase = lowercase; 426 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; 427 sbi->sb_err = errs; sbi->sb_timeshift = timeshift; 428 429 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); 430 431 replace_mount_options(s, new_opts); 432 433 hpfs_unlock(s); 434 return 0; 435 436 out_err: 437 hpfs_unlock(s); 438 kfree(new_opts); 439 return -EINVAL; 440 } 441 442 /* Super operations */ 443 444 static const struct super_operations hpfs_sops = 445 { 446 .alloc_inode = hpfs_alloc_inode, 447 .destroy_inode = hpfs_destroy_inode, 448 .evict_inode = hpfs_evict_inode, 449 .put_super = hpfs_put_super, 450 .statfs = hpfs_statfs, 451 .remount_fs = hpfs_remount_fs, 452 .show_options = generic_show_options, 453 }; 454 455 static int hpfs_fill_super(struct super_block *s, void *options, int silent) 456 { 457 struct buffer_head *bh0, *bh1, *bh2; 458 struct hpfs_boot_block *bootblock; 459 struct hpfs_super_block *superblock; 460 struct hpfs_spare_block *spareblock; 461 struct hpfs_sb_info *sbi; 462 struct inode *root; 463 464 kuid_t uid; 465 kgid_t gid; 466 umode_t umask; 467 int lowercase, eas, chk, errs, chkdsk, timeshift; 468 469 dnode_secno root_dno; 470 struct hpfs_dirent *de = NULL; 471 struct quad_buffer_head qbh; 472 473 int o; 474 475 save_mount_options(s, options); 476 477 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 478 if (!sbi) { 479 return -ENOMEM; 480 } 481 s->s_fs_info = sbi; 482 483 sbi->sb_bmp_dir = NULL; 484 sbi->sb_cp_table = NULL; 485 486 mutex_init(&sbi->hpfs_mutex); 487 hpfs_lock(s); 488 489 uid = current_uid(); 490 gid = current_gid(); 491 umask = current_umask(); 492 lowercase = 0; 493 eas = 2; 494 chk = 1; 495 errs = 1; 496 chkdsk = 1; 497 timeshift = 0; 498 499 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, 500 &eas, &chk, &errs, &chkdsk, ×hift))) { 501 printk("HPFS: bad mount options.\n"); 502 goto bail0; 503 } 504 if (o==2) { 505 hpfs_help(); 506 goto bail0; 507 } 508 509 /*sbi->sb_mounting = 1;*/ 510 sb_set_blocksize(s, 512); 511 sbi->sb_fs_size = -1; 512 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; 513 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; 514 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; 515 516 /* Check magics */ 517 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC 518 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC 519 || le32_to_cpu(spareblock->magic) != SP_MAGIC) { 520 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n"); 521 goto bail4; 522 } 523 524 /* Check version */ 525 if (!(s->s_flags & MS_RDONLY) && 526 superblock->funcversion != 2 && superblock->funcversion != 3) { 527 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n", 528 (int)superblock->version, (int)superblock->funcversion); 529 printk("HPFS: please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n"); 530 goto bail4; 531 } 532 533 s->s_flags |= MS_NOATIME; 534 535 /* Fill superblock stuff */ 536 s->s_magic = HPFS_SUPER_MAGIC; 537 s->s_op = &hpfs_sops; 538 s->s_d_op = &hpfs_dentry_operations; 539 540 sbi->sb_root = le32_to_cpu(superblock->root); 541 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); 542 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); 543 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); 544 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); 545 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); 546 sbi->sb_uid = uid; 547 sbi->sb_gid = gid; 548 sbi->sb_mode = 0777 & ~umask; 549 sbi->sb_n_free = -1; 550 sbi->sb_n_free_dnodes = -1; 551 sbi->sb_lowercase = lowercase; 552 sbi->sb_eas = eas; 553 sbi->sb_chk = chk; 554 sbi->sb_chkdsk = chkdsk; 555 sbi->sb_err = errs; 556 sbi->sb_timeshift = timeshift; 557 sbi->sb_was_error = 0; 558 sbi->sb_cp_table = NULL; 559 sbi->sb_c_bitmap = -1; 560 sbi->sb_max_fwd_alloc = 0xffffff; 561 562 /* Load bitmap directory */ 563 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) 564 goto bail4; 565 566 /* Check for general fs errors*/ 567 if (spareblock->dirty && !spareblock->old_wrote) { 568 if (errs == 2) { 569 printk("HPFS: Improperly stopped, not mounted\n"); 570 goto bail4; 571 } 572 hpfs_error(s, "improperly stopped"); 573 } 574 575 if (!(s->s_flags & MS_RDONLY)) { 576 spareblock->dirty = 1; 577 spareblock->old_wrote = 0; 578 mark_buffer_dirty(bh2); 579 } 580 581 if (spareblock->hotfixes_used || spareblock->n_spares_used) { 582 if (errs >= 2) { 583 printk("HPFS: Hotfixes not supported here, try chkdsk\n"); 584 mark_dirty(s, 0); 585 goto bail4; 586 } 587 hpfs_error(s, "hotfixes not supported here, try chkdsk"); 588 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n"); 589 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n"); 590 } 591 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { 592 if (errs >= 2) { 593 printk("HPFS: Spare dnodes used, try chkdsk\n"); 594 mark_dirty(s, 0); 595 goto bail4; 596 } 597 hpfs_error(s, "warning: spare dnodes used, try chkdsk"); 598 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); 599 } 600 if (chk) { 601 unsigned a; 602 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || 603 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { 604 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", 605 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); 606 goto bail4; 607 } 608 a = sbi->sb_dirband_size; 609 sbi->sb_dirband_size = 0; 610 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || 611 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || 612 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { 613 mark_dirty(s, 0); 614 goto bail4; 615 } 616 sbi->sb_dirband_size = a; 617 } else printk("HPFS: You really don't want any checks? You are crazy...\n"); 618 619 /* Load code page table */ 620 if (le32_to_cpu(spareblock->n_code_pages)) 621 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) 622 printk("HPFS: Warning: code page support is disabled\n"); 623 624 brelse(bh2); 625 brelse(bh1); 626 brelse(bh0); 627 628 root = iget_locked(s, sbi->sb_root); 629 if (!root) 630 goto bail0; 631 hpfs_init_inode(root); 632 hpfs_read_inode(root); 633 unlock_new_inode(root); 634 s->s_root = d_make_root(root); 635 if (!s->s_root) 636 goto bail0; 637 638 /* 639 * find the root directory's . pointer & finish filling in the inode 640 */ 641 642 root_dno = hpfs_fnode_dno(s, sbi->sb_root); 643 if (root_dno) 644 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); 645 if (!de) 646 hpfs_error(s, "unable to find root dir"); 647 else { 648 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); 649 root->i_atime.tv_nsec = 0; 650 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); 651 root->i_mtime.tv_nsec = 0; 652 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); 653 root->i_ctime.tv_nsec = 0; 654 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); 655 hpfs_i(root)->i_parent_dir = root->i_ino; 656 if (root->i_size == -1) 657 root->i_size = 2048; 658 if (root->i_blocks == -1) 659 root->i_blocks = 5; 660 hpfs_brelse4(&qbh); 661 } 662 hpfs_unlock(s); 663 return 0; 664 665 bail4: brelse(bh2); 666 bail3: brelse(bh1); 667 bail2: brelse(bh0); 668 bail1: 669 bail0: 670 hpfs_unlock(s); 671 kfree(sbi->sb_bmp_dir); 672 kfree(sbi->sb_cp_table); 673 s->s_fs_info = NULL; 674 kfree(sbi); 675 return -EINVAL; 676 } 677 678 static struct dentry *hpfs_mount(struct file_system_type *fs_type, 679 int flags, const char *dev_name, void *data) 680 { 681 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); 682 } 683 684 static struct file_system_type hpfs_fs_type = { 685 .owner = THIS_MODULE, 686 .name = "hpfs", 687 .mount = hpfs_mount, 688 .kill_sb = kill_block_super, 689 .fs_flags = FS_REQUIRES_DEV, 690 }; 691 692 static int __init init_hpfs_fs(void) 693 { 694 int err = init_inodecache(); 695 if (err) 696 goto out1; 697 err = register_filesystem(&hpfs_fs_type); 698 if (err) 699 goto out; 700 return 0; 701 out: 702 destroy_inodecache(); 703 out1: 704 return err; 705 } 706 707 static void __exit exit_hpfs_fs(void) 708 { 709 unregister_filesystem(&hpfs_fs_type); 710 destroy_inodecache(); 711 } 712 713 module_init(init_hpfs_fs) 714 module_exit(exit_hpfs_fs) 715 MODULE_LICENSE("GPL");
Cache object: f5fe9e0e0260ae9e0a0abda88cde2b7a
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