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 void hpfs_error(struct super_block *s, const char *fmt, ...) 56 { 57 struct va_format vaf; 58 va_list args; 59 60 va_start(args, fmt); 61 62 vaf.fmt = fmt; 63 vaf.va = &args; 64 65 pr_err("filesystem error: %pV", &vaf); 66 67 va_end(args); 68 69 if (!hpfs_sb(s)->sb_was_error) { 70 if (hpfs_sb(s)->sb_err == 2) { 71 pr_cont("; crashing the system because you wanted it\n"); 72 mark_dirty(s, 0); 73 panic("HPFS panic"); 74 } else if (hpfs_sb(s)->sb_err == 1) { 75 if (s->s_flags & MS_RDONLY) 76 pr_cont("; already mounted read-only\n"); 77 else { 78 pr_cont("; remounting read-only\n"); 79 mark_dirty(s, 0); 80 s->s_flags |= MS_RDONLY; 81 } 82 } else if (s->s_flags & MS_RDONLY) 83 pr_cont("; going on - but anything won't be destroyed because it's read-only\n"); 84 else 85 pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); 86 } else 87 pr_cont("\n"); 88 hpfs_sb(s)->sb_was_error = 1; 89 } 90 91 /* 92 * A little trick to detect cycles in many hpfs structures and don't let the 93 * kernel crash on corrupted filesystem. When first called, set c2 to 0. 94 * 95 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories 96 * nested each in other, chkdsk locked up happilly. 97 */ 98 99 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, 100 char *msg) 101 { 102 if (*c2 && *c1 == key) { 103 hpfs_error(s, "cycle detected on key %08x in %s", key, msg); 104 return 1; 105 } 106 (*c2)++; 107 if (!((*c2 - 1) & *c2)) *c1 = key; 108 return 0; 109 } 110 111 static void free_sbi(struct hpfs_sb_info *sbi) 112 { 113 kfree(sbi->sb_cp_table); 114 kfree(sbi->sb_bmp_dir); 115 kfree(sbi); 116 } 117 118 static void lazy_free_sbi(struct rcu_head *rcu) 119 { 120 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); 121 } 122 123 static void hpfs_put_super(struct super_block *s) 124 { 125 hpfs_lock(s); 126 unmark_dirty(s); 127 hpfs_unlock(s); 128 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); 129 } 130 131 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) 132 { 133 struct quad_buffer_head qbh; 134 unsigned long *bits; 135 unsigned count; 136 137 bits = hpfs_map_4sectors(s, secno, &qbh, 0); 138 if (!bits) 139 return (unsigned)-1; 140 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); 141 hpfs_brelse4(&qbh); 142 return count; 143 } 144 145 static unsigned count_bitmaps(struct super_block *s) 146 { 147 unsigned n, count, n_bands; 148 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; 149 count = 0; 150 for (n = 0; n < COUNT_RD_AHEAD; n++) { 151 hpfs_prefetch_bitmap(s, n); 152 } 153 for (n = 0; n < n_bands; n++) { 154 unsigned c; 155 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); 156 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); 157 if (c != (unsigned)-1) 158 count += c; 159 } 160 return count; 161 } 162 163 unsigned hpfs_get_free_dnodes(struct super_block *s) 164 { 165 struct hpfs_sb_info *sbi = hpfs_sb(s); 166 if (sbi->sb_n_free_dnodes == (unsigned)-1) { 167 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap); 168 if (c == (unsigned)-1) 169 return 0; 170 sbi->sb_n_free_dnodes = c; 171 } 172 return sbi->sb_n_free_dnodes; 173 } 174 175 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) 176 { 177 struct super_block *s = dentry->d_sb; 178 struct hpfs_sb_info *sbi = hpfs_sb(s); 179 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 180 181 hpfs_lock(s); 182 183 if (sbi->sb_n_free == (unsigned)-1) 184 sbi->sb_n_free = count_bitmaps(s); 185 186 buf->f_type = s->s_magic; 187 buf->f_bsize = 512; 188 buf->f_blocks = sbi->sb_fs_size; 189 buf->f_bfree = sbi->sb_n_free; 190 buf->f_bavail = sbi->sb_n_free; 191 buf->f_files = sbi->sb_dirband_size / 4; 192 buf->f_ffree = hpfs_get_free_dnodes(s); 193 buf->f_fsid.val[0] = (u32)id; 194 buf->f_fsid.val[1] = (u32)(id >> 32); 195 buf->f_namelen = 254; 196 197 hpfs_unlock(s); 198 199 return 0; 200 } 201 202 203 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg) 204 { 205 switch (cmd) { 206 case FITRIM: { 207 struct fstrim_range range; 208 secno n_trimmed; 209 int r; 210 if (!capable(CAP_SYS_ADMIN)) 211 return -EPERM; 212 if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) 213 return -EFAULT; 214 r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed); 215 if (r) 216 return r; 217 range.len = (u64)n_trimmed << 9; 218 if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range))) 219 return -EFAULT; 220 return 0; 221 } 222 default: { 223 return -ENOIOCTLCMD; 224 } 225 } 226 } 227 228 229 static struct kmem_cache * hpfs_inode_cachep; 230 231 static struct inode *hpfs_alloc_inode(struct super_block *sb) 232 { 233 struct hpfs_inode_info *ei; 234 ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); 235 if (!ei) 236 return NULL; 237 ei->vfs_inode.i_version = 1; 238 return &ei->vfs_inode; 239 } 240 241 static void hpfs_i_callback(struct rcu_head *head) 242 { 243 struct inode *inode = container_of(head, struct inode, i_rcu); 244 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); 245 } 246 247 static void hpfs_destroy_inode(struct inode *inode) 248 { 249 call_rcu(&inode->i_rcu, hpfs_i_callback); 250 } 251 252 static void init_once(void *foo) 253 { 254 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; 255 256 inode_init_once(&ei->vfs_inode); 257 } 258 259 static int init_inodecache(void) 260 { 261 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", 262 sizeof(struct hpfs_inode_info), 263 0, (SLAB_RECLAIM_ACCOUNT| 264 SLAB_MEM_SPREAD), 265 init_once); 266 if (hpfs_inode_cachep == NULL) 267 return -ENOMEM; 268 return 0; 269 } 270 271 static void destroy_inodecache(void) 272 { 273 /* 274 * Make sure all delayed rcu free inodes are flushed before we 275 * destroy cache. 276 */ 277 rcu_barrier(); 278 kmem_cache_destroy(hpfs_inode_cachep); 279 } 280 281 /* 282 * A tiny parser for option strings, stolen from dosfs. 283 * Stolen again from read-only hpfs. 284 * And updated for table-driven option parsing. 285 */ 286 287 enum { 288 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, 289 Opt_check_none, Opt_check_normal, Opt_check_strict, 290 Opt_err_cont, Opt_err_ro, Opt_err_panic, 291 Opt_eas_no, Opt_eas_ro, Opt_eas_rw, 292 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, 293 Opt_timeshift, Opt_err, 294 }; 295 296 static const match_table_t tokens = { 297 {Opt_help, "help"}, 298 {Opt_uid, "uid=%u"}, 299 {Opt_gid, "gid=%u"}, 300 {Opt_umask, "umask=%o"}, 301 {Opt_case_lower, "case=lower"}, 302 {Opt_case_asis, "case=asis"}, 303 {Opt_check_none, "check=none"}, 304 {Opt_check_normal, "check=normal"}, 305 {Opt_check_strict, "check=strict"}, 306 {Opt_err_cont, "errors=continue"}, 307 {Opt_err_ro, "errors=remount-ro"}, 308 {Opt_err_panic, "errors=panic"}, 309 {Opt_eas_no, "eas=no"}, 310 {Opt_eas_ro, "eas=ro"}, 311 {Opt_eas_rw, "eas=rw"}, 312 {Opt_chkdsk_no, "chkdsk=no"}, 313 {Opt_chkdsk_errors, "chkdsk=errors"}, 314 {Opt_chkdsk_always, "chkdsk=always"}, 315 {Opt_timeshift, "timeshift=%d"}, 316 {Opt_err, NULL}, 317 }; 318 319 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, 320 int *lowercase, int *eas, int *chk, int *errs, 321 int *chkdsk, int *timeshift) 322 { 323 char *p; 324 int option; 325 326 if (!opts) 327 return 1; 328 329 /*pr_info("Parsing opts: '%s'\n",opts);*/ 330 331 while ((p = strsep(&opts, ",")) != NULL) { 332 substring_t args[MAX_OPT_ARGS]; 333 int token; 334 if (!*p) 335 continue; 336 337 token = match_token(p, tokens, args); 338 switch (token) { 339 case Opt_help: 340 return 2; 341 case Opt_uid: 342 if (match_int(args, &option)) 343 return 0; 344 *uid = make_kuid(current_user_ns(), option); 345 if (!uid_valid(*uid)) 346 return 0; 347 break; 348 case Opt_gid: 349 if (match_int(args, &option)) 350 return 0; 351 *gid = make_kgid(current_user_ns(), option); 352 if (!gid_valid(*gid)) 353 return 0; 354 break; 355 case Opt_umask: 356 if (match_octal(args, &option)) 357 return 0; 358 *umask = option; 359 break; 360 case Opt_case_lower: 361 *lowercase = 1; 362 break; 363 case Opt_case_asis: 364 *lowercase = 0; 365 break; 366 case Opt_check_none: 367 *chk = 0; 368 break; 369 case Opt_check_normal: 370 *chk = 1; 371 break; 372 case Opt_check_strict: 373 *chk = 2; 374 break; 375 case Opt_err_cont: 376 *errs = 0; 377 break; 378 case Opt_err_ro: 379 *errs = 1; 380 break; 381 case Opt_err_panic: 382 *errs = 2; 383 break; 384 case Opt_eas_no: 385 *eas = 0; 386 break; 387 case Opt_eas_ro: 388 *eas = 1; 389 break; 390 case Opt_eas_rw: 391 *eas = 2; 392 break; 393 case Opt_chkdsk_no: 394 *chkdsk = 0; 395 break; 396 case Opt_chkdsk_errors: 397 *chkdsk = 1; 398 break; 399 case Opt_chkdsk_always: 400 *chkdsk = 2; 401 break; 402 case Opt_timeshift: 403 { 404 int m = 1; 405 char *rhs = args[0].from; 406 if (!rhs || !*rhs) 407 return 0; 408 if (*rhs == '-') m = -1; 409 if (*rhs == '+' || *rhs == '-') rhs++; 410 *timeshift = simple_strtoul(rhs, &rhs, 0) * m; 411 if (*rhs) 412 return 0; 413 break; 414 } 415 default: 416 return 0; 417 } 418 } 419 return 1; 420 } 421 422 static inline void hpfs_help(void) 423 { 424 pr_info("\n\ 425 HPFS filesystem options:\n\ 426 help do not mount and display this text\n\ 427 uid=xxx set uid of files that don't have uid specified in eas\n\ 428 gid=xxx set gid of files that don't have gid specified in eas\n\ 429 umask=xxx set mode of files that don't have mode specified in eas\n\ 430 case=lower lowercase all files\n\ 431 case=asis do not lowercase files (default)\n\ 432 check=none no fs checks - kernel may crash on corrupted filesystem\n\ 433 check=normal do some checks - it should not crash (default)\n\ 434 check=strict do extra time-consuming checks, used for debugging\n\ 435 errors=continue continue on errors\n\ 436 errors=remount-ro remount read-only if errors found (default)\n\ 437 errors=panic panic on errors\n\ 438 chkdsk=no do not mark fs for chkdsking even if there were errors\n\ 439 chkdsk=errors mark fs dirty if errors found (default)\n\ 440 chkdsk=always always mark fs dirty - used for debugging\n\ 441 eas=no ignore extended attributes\n\ 442 eas=ro read but do not write extended attributes\n\ 443 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ 444 timeshift=nnn add nnn seconds to file times\n\ 445 \n"); 446 } 447 448 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) 449 { 450 kuid_t uid; 451 kgid_t gid; 452 umode_t umask; 453 int lowercase, eas, chk, errs, chkdsk, timeshift; 454 int o; 455 struct hpfs_sb_info *sbi = hpfs_sb(s); 456 char *new_opts = kstrdup(data, GFP_KERNEL); 457 458 if (!new_opts) 459 return -ENOMEM; 460 461 sync_filesystem(s); 462 463 *flags |= MS_NOATIME; 464 465 hpfs_lock(s); 466 uid = sbi->sb_uid; gid = sbi->sb_gid; 467 umask = 0777 & ~sbi->sb_mode; 468 lowercase = sbi->sb_lowercase; 469 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; 470 errs = sbi->sb_err; timeshift = sbi->sb_timeshift; 471 472 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, 473 &eas, &chk, &errs, &chkdsk, ×hift))) { 474 pr_err("bad mount options.\n"); 475 goto out_err; 476 } 477 if (o == 2) { 478 hpfs_help(); 479 goto out_err; 480 } 481 if (timeshift != sbi->sb_timeshift) { 482 pr_err("timeshift can't be changed using remount.\n"); 483 goto out_err; 484 } 485 486 unmark_dirty(s); 487 488 sbi->sb_uid = uid; sbi->sb_gid = gid; 489 sbi->sb_mode = 0777 & ~umask; 490 sbi->sb_lowercase = lowercase; 491 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; 492 sbi->sb_err = errs; sbi->sb_timeshift = timeshift; 493 494 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); 495 496 replace_mount_options(s, new_opts); 497 498 hpfs_unlock(s); 499 return 0; 500 501 out_err: 502 hpfs_unlock(s); 503 kfree(new_opts); 504 return -EINVAL; 505 } 506 507 /* Super operations */ 508 509 static const struct super_operations hpfs_sops = 510 { 511 .alloc_inode = hpfs_alloc_inode, 512 .destroy_inode = hpfs_destroy_inode, 513 .evict_inode = hpfs_evict_inode, 514 .put_super = hpfs_put_super, 515 .statfs = hpfs_statfs, 516 .remount_fs = hpfs_remount_fs, 517 .show_options = generic_show_options, 518 }; 519 520 static int hpfs_fill_super(struct super_block *s, void *options, int silent) 521 { 522 struct buffer_head *bh0, *bh1, *bh2; 523 struct hpfs_boot_block *bootblock; 524 struct hpfs_super_block *superblock; 525 struct hpfs_spare_block *spareblock; 526 struct hpfs_sb_info *sbi; 527 struct inode *root; 528 529 kuid_t uid; 530 kgid_t gid; 531 umode_t umask; 532 int lowercase, eas, chk, errs, chkdsk, timeshift; 533 534 dnode_secno root_dno; 535 struct hpfs_dirent *de = NULL; 536 struct quad_buffer_head qbh; 537 538 int o; 539 540 save_mount_options(s, options); 541 542 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 543 if (!sbi) { 544 return -ENOMEM; 545 } 546 s->s_fs_info = sbi; 547 548 mutex_init(&sbi->hpfs_mutex); 549 hpfs_lock(s); 550 551 uid = current_uid(); 552 gid = current_gid(); 553 umask = current_umask(); 554 lowercase = 0; 555 eas = 2; 556 chk = 1; 557 errs = 1; 558 chkdsk = 1; 559 timeshift = 0; 560 561 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, 562 &eas, &chk, &errs, &chkdsk, ×hift))) { 563 pr_err("bad mount options.\n"); 564 goto bail0; 565 } 566 if (o==2) { 567 hpfs_help(); 568 goto bail0; 569 } 570 571 /*sbi->sb_mounting = 1;*/ 572 sb_set_blocksize(s, 512); 573 sbi->sb_fs_size = -1; 574 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; 575 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; 576 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; 577 578 /* Check magics */ 579 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC 580 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC 581 || le32_to_cpu(spareblock->magic) != SP_MAGIC) { 582 if (!silent) 583 pr_err("Bad magic ... probably not HPFS\n"); 584 goto bail4; 585 } 586 587 /* Check version */ 588 if (!(s->s_flags & MS_RDONLY) && 589 superblock->funcversion != 2 && superblock->funcversion != 3) { 590 pr_err("Bad version %d,%d. Mount readonly to go around\n", 591 (int)superblock->version, (int)superblock->funcversion); 592 pr_err("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"); 593 goto bail4; 594 } 595 596 s->s_flags |= MS_NOATIME; 597 598 /* Fill superblock stuff */ 599 s->s_magic = HPFS_SUPER_MAGIC; 600 s->s_op = &hpfs_sops; 601 s->s_d_op = &hpfs_dentry_operations; 602 603 sbi->sb_root = le32_to_cpu(superblock->root); 604 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); 605 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); 606 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); 607 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); 608 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); 609 sbi->sb_uid = uid; 610 sbi->sb_gid = gid; 611 sbi->sb_mode = 0777 & ~umask; 612 sbi->sb_n_free = -1; 613 sbi->sb_n_free_dnodes = -1; 614 sbi->sb_lowercase = lowercase; 615 sbi->sb_eas = eas; 616 sbi->sb_chk = chk; 617 sbi->sb_chkdsk = chkdsk; 618 sbi->sb_err = errs; 619 sbi->sb_timeshift = timeshift; 620 sbi->sb_was_error = 0; 621 sbi->sb_cp_table = NULL; 622 sbi->sb_c_bitmap = -1; 623 sbi->sb_max_fwd_alloc = 0xffffff; 624 625 if (sbi->sb_fs_size >= 0x80000000) { 626 hpfs_error(s, "invalid size in superblock: %08x", 627 (unsigned)sbi->sb_fs_size); 628 goto bail4; 629 } 630 631 if (spareblock->n_spares_used) 632 hpfs_load_hotfix_map(s, spareblock); 633 634 /* Load bitmap directory */ 635 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) 636 goto bail4; 637 638 /* Check for general fs errors*/ 639 if (spareblock->dirty && !spareblock->old_wrote) { 640 if (errs == 2) { 641 pr_err("Improperly stopped, not mounted\n"); 642 goto bail4; 643 } 644 hpfs_error(s, "improperly stopped"); 645 } 646 647 if (!(s->s_flags & MS_RDONLY)) { 648 spareblock->dirty = 1; 649 spareblock->old_wrote = 0; 650 mark_buffer_dirty(bh2); 651 } 652 653 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { 654 if (errs >= 2) { 655 pr_err("Spare dnodes used, try chkdsk\n"); 656 mark_dirty(s, 0); 657 goto bail4; 658 } 659 hpfs_error(s, "warning: spare dnodes used, try chkdsk"); 660 if (errs == 0) 661 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); 662 } 663 if (chk) { 664 unsigned a; 665 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || 666 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { 667 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", 668 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); 669 goto bail4; 670 } 671 a = sbi->sb_dirband_size; 672 sbi->sb_dirband_size = 0; 673 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || 674 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || 675 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { 676 mark_dirty(s, 0); 677 goto bail4; 678 } 679 sbi->sb_dirband_size = a; 680 } else 681 pr_err("You really don't want any checks? You are crazy...\n"); 682 683 /* Load code page table */ 684 if (le32_to_cpu(spareblock->n_code_pages)) 685 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) 686 pr_err("code page support is disabled\n"); 687 688 brelse(bh2); 689 brelse(bh1); 690 brelse(bh0); 691 692 root = iget_locked(s, sbi->sb_root); 693 if (!root) 694 goto bail0; 695 hpfs_init_inode(root); 696 hpfs_read_inode(root); 697 unlock_new_inode(root); 698 s->s_root = d_make_root(root); 699 if (!s->s_root) 700 goto bail0; 701 702 /* 703 * find the root directory's . pointer & finish filling in the inode 704 */ 705 706 root_dno = hpfs_fnode_dno(s, sbi->sb_root); 707 if (root_dno) 708 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); 709 if (!de) 710 hpfs_error(s, "unable to find root dir"); 711 else { 712 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); 713 root->i_atime.tv_nsec = 0; 714 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); 715 root->i_mtime.tv_nsec = 0; 716 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); 717 root->i_ctime.tv_nsec = 0; 718 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); 719 hpfs_i(root)->i_parent_dir = root->i_ino; 720 if (root->i_size == -1) 721 root->i_size = 2048; 722 if (root->i_blocks == -1) 723 root->i_blocks = 5; 724 hpfs_brelse4(&qbh); 725 } 726 hpfs_unlock(s); 727 return 0; 728 729 bail4: brelse(bh2); 730 bail3: brelse(bh1); 731 bail2: brelse(bh0); 732 bail1: 733 bail0: 734 hpfs_unlock(s); 735 free_sbi(sbi); 736 return -EINVAL; 737 } 738 739 static struct dentry *hpfs_mount(struct file_system_type *fs_type, 740 int flags, const char *dev_name, void *data) 741 { 742 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); 743 } 744 745 static struct file_system_type hpfs_fs_type = { 746 .owner = THIS_MODULE, 747 .name = "hpfs", 748 .mount = hpfs_mount, 749 .kill_sb = kill_block_super, 750 .fs_flags = FS_REQUIRES_DEV, 751 }; 752 MODULE_ALIAS_FS("hpfs"); 753 754 static int __init init_hpfs_fs(void) 755 { 756 int err = init_inodecache(); 757 if (err) 758 goto out1; 759 err = register_filesystem(&hpfs_fs_type); 760 if (err) 761 goto out; 762 return 0; 763 out: 764 destroy_inodecache(); 765 out1: 766 return err; 767 } 768 769 static void __exit exit_hpfs_fs(void) 770 { 771 unregister_filesystem(&hpfs_fs_type); 772 destroy_inodecache(); 773 } 774 775 module_init(init_hpfs_fs) 776 module_exit(exit_hpfs_fs) 777 MODULE_LICENSE("GPL"); 778