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#include <linux/seq_file.h> 19 20/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ 21 22static void mark_dirty(struct super_block *s, int remount) 23{ 24 if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) { 25 struct buffer_head *bh; 26 struct hpfs_spare_block *sb; 27 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 28 sb->dirty = 1; 29 sb->old_wrote = 0; 30 mark_buffer_dirty(bh); 31 sync_dirty_buffer(bh); 32 brelse(bh); 33 } 34 } 35} 36 37/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there 38 were errors) */ 39 40static void unmark_dirty(struct super_block *s) 41{ 42 struct buffer_head *bh; 43 struct hpfs_spare_block *sb; 44 if (s->s_flags & MS_RDONLY) return; 45 sync_blockdev(s->s_bdev); 46 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 47 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error; 48 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error; 49 mark_buffer_dirty(bh); 50 sync_dirty_buffer(bh); 51 brelse(bh); 52 } 53} 54 55/* Filesystem error... */ 56void hpfs_error(struct super_block *s, const char *fmt, ...) 57{ 58 struct va_format vaf; 59 va_list args; 60 61 va_start(args, fmt); 62 63 vaf.fmt = fmt; 64 vaf.va = &args; 65 66 pr_err("filesystem error: %pV", &vaf); 67 68 va_end(args); 69 70 if (!hpfs_sb(s)->sb_was_error) { 71 if (hpfs_sb(s)->sb_err == 2) { 72 pr_cont("; crashing the system because you wanted it\n"); 73 mark_dirty(s, 0); 74 panic("HPFS panic"); 75 } else if (hpfs_sb(s)->sb_err == 1) { 76 if (s->s_flags & MS_RDONLY) 77 pr_cont("; already mounted read-only\n"); 78 else { 79 pr_cont("; remounting read-only\n"); 80 mark_dirty(s, 0); 81 s->s_flags |= MS_RDONLY; 82 } 83 } else if (s->s_flags & MS_RDONLY) 84 pr_cont("; going on - but anything won't be destroyed because it's read-only\n"); 85 else 86 pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); 87 } else 88 pr_cont("\n"); 89 hpfs_sb(s)->sb_was_error = 1; 90} 91 92/* 93 * A little trick to detect cycles in many hpfs structures and don't let the 94 * kernel crash on corrupted filesystem. When first called, set c2 to 0. 95 * 96 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories 97 * nested each in other, chkdsk locked up happilly. 98 */ 99 100int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, 101 char *msg) 102{ 103 if (*c2 && *c1 == key) { 104 hpfs_error(s, "cycle detected on key %08x in %s", key, msg); 105 return 1; 106 } 107 (*c2)++; 108 if (!((*c2 - 1) & *c2)) *c1 = key; 109 return 0; 110} 111 112static void free_sbi(struct hpfs_sb_info *sbi) 113{ 114 kfree(sbi->sb_cp_table); 115 kfree(sbi->sb_bmp_dir); 116 kfree(sbi); 117} 118 119static void lazy_free_sbi(struct rcu_head *rcu) 120{ 121 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); 122} 123 124static void hpfs_put_super(struct super_block *s) 125{ 126 hpfs_lock(s); 127 unmark_dirty(s); 128 hpfs_unlock(s); 129 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); 130} 131 132static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) 133{ 134 struct quad_buffer_head qbh; 135 unsigned long *bits; 136 unsigned count; 137 138 bits = hpfs_map_4sectors(s, secno, &qbh, 0); 139 if (!bits) 140 return (unsigned)-1; 141 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); 142 hpfs_brelse4(&qbh); 143 return count; 144} 145 146static unsigned count_bitmaps(struct super_block *s) 147{ 148 unsigned n, count, n_bands; 149 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; 150 count = 0; 151 for (n = 0; n < COUNT_RD_AHEAD; n++) { 152 hpfs_prefetch_bitmap(s, n); 153 } 154 for (n = 0; n < n_bands; n++) { 155 unsigned c; 156 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); 157 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); 158 if (c != (unsigned)-1) 159 count += c; 160 } 161 return count; 162} 163 164unsigned hpfs_get_free_dnodes(struct super_block *s) 165{ 166 struct hpfs_sb_info *sbi = hpfs_sb(s); 167 if (sbi->sb_n_free_dnodes == (unsigned)-1) { 168 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap); 169 if (c == (unsigned)-1) 170 return 0; 171 sbi->sb_n_free_dnodes = c; 172 } 173 return sbi->sb_n_free_dnodes; 174} 175 176static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) 177{ 178 struct super_block *s = dentry->d_sb; 179 struct hpfs_sb_info *sbi = hpfs_sb(s); 180 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 181 182 hpfs_lock(s); 183 184 if (sbi->sb_n_free == (unsigned)-1) 185 sbi->sb_n_free = count_bitmaps(s); 186 187 buf->f_type = s->s_magic; 188 buf->f_bsize = 512; 189 buf->f_blocks = sbi->sb_fs_size; 190 buf->f_bfree = sbi->sb_n_free; 191 buf->f_bavail = sbi->sb_n_free; 192 buf->f_files = sbi->sb_dirband_size / 4; 193 buf->f_ffree = hpfs_get_free_dnodes(s); 194 buf->f_fsid.val[0] = (u32)id; 195 buf->f_fsid.val[1] = (u32)(id >> 32); 196 buf->f_namelen = 254; 197 198 hpfs_unlock(s); 199 200 return 0; 201} 202 203static struct kmem_cache * hpfs_inode_cachep; 204 205static struct inode *hpfs_alloc_inode(struct super_block *sb) 206{ 207 struct hpfs_inode_info *ei; 208 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); 209 if (!ei) 210 return NULL; 211 ei->vfs_inode.i_version = 1; 212 return &ei->vfs_inode; 213} 214 215static void hpfs_i_callback(struct rcu_head *head) 216{ 217 struct inode *inode = container_of(head, struct inode, i_rcu); 218 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); 219} 220 221static void hpfs_destroy_inode(struct inode *inode) 222{ 223 call_rcu(&inode->i_rcu, hpfs_i_callback); 224} 225 226static void init_once(void *foo) 227{ 228 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; 229 230 inode_init_once(&ei->vfs_inode); 231} 232 233static int init_inodecache(void) 234{ 235 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", 236 sizeof(struct hpfs_inode_info), 237 0, (SLAB_RECLAIM_ACCOUNT| 238 SLAB_MEM_SPREAD), 239 init_once); 240 if (hpfs_inode_cachep == NULL) 241 return -ENOMEM; 242 return 0; 243} 244 245static void destroy_inodecache(void) 246{ 247 /* 248 * Make sure all delayed rcu free inodes are flushed before we 249 * destroy cache. 250 */ 251 rcu_barrier(); 252 kmem_cache_destroy(hpfs_inode_cachep); 253} 254 255/* 256 * A tiny parser for option strings, stolen from dosfs. 257 * Stolen again from read-only hpfs. 258 * And updated for table-driven option parsing. 259 */ 260 261enum { 262 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, 263 Opt_check_none, Opt_check_normal, Opt_check_strict, 264 Opt_err_cont, Opt_err_ro, Opt_err_panic, 265 Opt_eas_no, Opt_eas_ro, Opt_eas_rw, 266 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, 267 Opt_timeshift, Opt_err, 268}; 269 270static const match_table_t tokens = { 271 {Opt_help, "help"}, 272 {Opt_uid, "uid=%u"}, 273 {Opt_gid, "gid=%u"}, 274 {Opt_umask, "umask=%o"}, 275 {Opt_case_lower, "case=lower"}, 276 {Opt_case_asis, "case=asis"}, 277 {Opt_check_none, "check=none"}, 278 {Opt_check_normal, "check=normal"}, 279 {Opt_check_strict, "check=strict"}, 280 {Opt_err_cont, "errors=continue"}, 281 {Opt_err_ro, "errors=remount-ro"}, 282 {Opt_err_panic, "errors=panic"}, 283 {Opt_eas_no, "eas=no"}, 284 {Opt_eas_ro, "eas=ro"}, 285 {Opt_eas_rw, "eas=rw"}, 286 {Opt_chkdsk_no, "chkdsk=no"}, 287 {Opt_chkdsk_errors, "chkdsk=errors"}, 288 {Opt_chkdsk_always, "chkdsk=always"}, 289 {Opt_timeshift, "timeshift=%d"}, 290 {Opt_err, NULL}, 291}; 292 293static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, 294 int *lowercase, int *eas, int *chk, int *errs, 295 int *chkdsk, int *timeshift) 296{ 297 char *p; 298 int option; 299 300 if (!opts) 301 return 1; 302 303 /*pr_info("Parsing opts: '%s'\n",opts);*/ 304 305 while ((p = strsep(&opts, ",")) != NULL) { 306 substring_t args[MAX_OPT_ARGS]; 307 int token; 308 if (!*p) 309 continue; 310 311 token = match_token(p, tokens, args); 312 switch (token) { 313 case Opt_help: 314 return 2; 315 case Opt_uid: 316 if (match_int(args, &option)) 317 return 0; 318 *uid = make_kuid(current_user_ns(), option); 319 if (!uid_valid(*uid)) 320 return 0; 321 break; 322 case Opt_gid: 323 if (match_int(args, &option)) 324 return 0; 325 *gid = make_kgid(current_user_ns(), option); 326 if (!gid_valid(*gid)) 327 return 0; 328 break; 329 case Opt_umask: 330 if (match_octal(args, &option)) 331 return 0; 332 *umask = option; 333 break; 334 case Opt_case_lower: 335 *lowercase = 1; 336 break; 337 case Opt_case_asis: 338 *lowercase = 0; 339 break; 340 case Opt_check_none: 341 *chk = 0; 342 break; 343 case Opt_check_normal: 344 *chk = 1; 345 break; 346 case Opt_check_strict: 347 *chk = 2; 348 break; 349 case Opt_err_cont: 350 *errs = 0; 351 break; 352 case Opt_err_ro: 353 *errs = 1; 354 break; 355 case Opt_err_panic: 356 *errs = 2; 357 break; 358 case Opt_eas_no: 359 *eas = 0; 360 break; 361 case Opt_eas_ro: 362 *eas = 1; 363 break; 364 case Opt_eas_rw: 365 *eas = 2; 366 break; 367 case Opt_chkdsk_no: 368 *chkdsk = 0; 369 break; 370 case Opt_chkdsk_errors: 371 *chkdsk = 1; 372 break; 373 case Opt_chkdsk_always: 374 *chkdsk = 2; 375 break; 376 case Opt_timeshift: 377 { 378 int m = 1; 379 char *rhs = args[0].from; 380 if (!rhs || !*rhs) 381 return 0; 382 if (*rhs == '-') m = -1; 383 if (*rhs == '+' || *rhs == '-') rhs++; 384 *timeshift = simple_strtoul(rhs, &rhs, 0) * m; 385 if (*rhs) 386 return 0; 387 break; 388 } 389 default: 390 return 0; 391 } 392 } 393 return 1; 394} 395 396static inline void hpfs_help(void) 397{ 398 pr_info("\n\ 399HPFS filesystem options:\n\ 400 help do not mount and display this text\n\ 401 uid=xxx set uid of files that don't have uid specified in eas\n\ 402 gid=xxx set gid of files that don't have gid specified in eas\n\ 403 umask=xxx set mode of files that don't have mode specified in eas\n\ 404 case=lower lowercase all files\n\ 405 case=asis do not lowercase files (default)\n\ 406 check=none no fs checks - kernel may crash on corrupted filesystem\n\ 407 check=normal do some checks - it should not crash (default)\n\ 408 check=strict do extra time-consuming checks, used for debugging\n\ 409 errors=continue continue on errors\n\ 410 errors=remount-ro remount read-only if errors found (default)\n\ 411 errors=panic panic on errors\n\ 412 chkdsk=no do not mark fs for chkdsking even if there were errors\n\ 413 chkdsk=errors mark fs dirty if errors found (default)\n\ 414 chkdsk=always always mark fs dirty - used for debugging\n\ 415 eas=no ignore extended attributes\n\ 416 eas=ro read but do not write extended attributes\n\ 417 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ 418 timeshift=nnn add nnn seconds to file times\n\ 419\n"); 420} 421 422static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) 423{ 424 kuid_t uid; 425 kgid_t gid; 426 umode_t umask; 427 int lowercase, eas, chk, errs, chkdsk, timeshift; 428 int o; 429 struct hpfs_sb_info *sbi = hpfs_sb(s); 430 431 sync_filesystem(s); 432 433 *flags |= MS_NOATIME; 434 435 hpfs_lock(s); 436 uid = sbi->sb_uid; gid = sbi->sb_gid; 437 umask = 0777 & ~sbi->sb_mode; 438 lowercase = sbi->sb_lowercase; 439 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; 440 errs = sbi->sb_err; timeshift = sbi->sb_timeshift; 441 442 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, 443 &eas, &chk, &errs, &chkdsk, ×hift))) { 444 pr_err("bad mount options.\n"); 445 goto out_err; 446 } 447 if (o == 2) { 448 hpfs_help(); 449 goto out_err; 450 } 451 if (timeshift != sbi->sb_timeshift) { 452 pr_err("timeshift can't be changed using remount.\n"); 453 goto out_err; 454 } 455 456 unmark_dirty(s); 457 458 sbi->sb_uid = uid; sbi->sb_gid = gid; 459 sbi->sb_mode = 0777 & ~umask; 460 sbi->sb_lowercase = lowercase; 461 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; 462 sbi->sb_err = errs; sbi->sb_timeshift = timeshift; 463 464 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); 465 466 hpfs_unlock(s); 467 return 0; 468 469out_err: 470 hpfs_unlock(s); 471 return -EINVAL; 472} 473 474static int hpfs_show_options(struct seq_file *seq, struct dentry *root) 475{ 476 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb); 477 478 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid)); 479 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid)); 480 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777)); 481 if (sbi->sb_lowercase) 482 seq_printf(seq, ",case=lower"); 483 if (!sbi->sb_chk) 484 seq_printf(seq, ",check=none"); 485 if (sbi->sb_chk == 2) 486 seq_printf(seq, ",check=strict"); 487 if (!sbi->sb_err) 488 seq_printf(seq, ",errors=continue"); 489 if (sbi->sb_err == 2) 490 seq_printf(seq, ",errors=panic"); 491 if (!sbi->sb_chkdsk) 492 seq_printf(seq, ",chkdsk=no"); 493 if (sbi->sb_chkdsk == 2) 494 seq_printf(seq, ",chkdsk=always"); 495 if (!sbi->sb_eas) 496 seq_printf(seq, ",eas=no"); 497 if (sbi->sb_eas == 1) 498 seq_printf(seq, ",eas=ro"); 499 if (sbi->sb_timeshift) 500 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift); 501 return 0; 502} 503 504/* Super operations */ 505 506static const struct super_operations hpfs_sops = 507{ 508 .alloc_inode = hpfs_alloc_inode, 509 .destroy_inode = hpfs_destroy_inode, 510 .evict_inode = hpfs_evict_inode, 511 .put_super = hpfs_put_super, 512 .statfs = hpfs_statfs, 513 .remount_fs = hpfs_remount_fs, 514 .show_options = hpfs_show_options, 515}; 516 517static int hpfs_fill_super(struct super_block *s, void *options, int silent) 518{ 519 struct buffer_head *bh0, *bh1, *bh2; 520 struct hpfs_boot_block *bootblock; 521 struct hpfs_super_block *superblock; 522 struct hpfs_spare_block *spareblock; 523 struct hpfs_sb_info *sbi; 524 struct inode *root; 525 526 kuid_t uid; 527 kgid_t gid; 528 umode_t umask; 529 int lowercase, eas, chk, errs, chkdsk, timeshift; 530 531 dnode_secno root_dno; 532 struct hpfs_dirent *de = NULL; 533 struct quad_buffer_head qbh; 534 535 int o; 536 537 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 538 if (!sbi) { 539 return -ENOMEM; 540 } 541 s->s_fs_info = sbi; 542 543 mutex_init(&sbi->hpfs_mutex); 544 hpfs_lock(s); 545 546 uid = current_uid(); 547 gid = current_gid(); 548 umask = current_umask(); 549 lowercase = 0; 550 eas = 2; 551 chk = 1; 552 errs = 1; 553 chkdsk = 1; 554 timeshift = 0; 555 556 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, 557 &eas, &chk, &errs, &chkdsk, ×hift))) { 558 pr_err("bad mount options.\n"); 559 goto bail0; 560 } 561 if (o==2) { 562 hpfs_help(); 563 goto bail0; 564 } 565 566 /*sbi->sb_mounting = 1;*/ 567 sb_set_blocksize(s, 512); 568 sbi->sb_fs_size = -1; 569 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; 570 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; 571 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; 572 573 /* Check magics */ 574 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC 575 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC 576 || le32_to_cpu(spareblock->magic) != SP_MAGIC) { 577 if (!silent) 578 pr_err("Bad magic ... probably not HPFS\n"); 579 goto bail4; 580 } 581 582 /* Check version */ 583 if (!(s->s_flags & MS_RDONLY) && 584 superblock->funcversion != 2 && superblock->funcversion != 3) { 585 pr_err("Bad version %d,%d. Mount readonly to go around\n", 586 (int)superblock->version, (int)superblock->funcversion); 587 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"); 588 goto bail4; 589 } 590 591 s->s_flags |= MS_NOATIME; 592 593 /* Fill superblock stuff */ 594 s->s_magic = HPFS_SUPER_MAGIC; 595 s->s_op = &hpfs_sops; 596 s->s_d_op = &hpfs_dentry_operations; 597 598 sbi->sb_root = le32_to_cpu(superblock->root); 599 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); 600 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); 601 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); 602 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); 603 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); 604 sbi->sb_uid = uid; 605 sbi->sb_gid = gid; 606 sbi->sb_mode = 0777 & ~umask; 607 sbi->sb_n_free = -1; 608 sbi->sb_n_free_dnodes = -1; 609 sbi->sb_lowercase = lowercase; 610 sbi->sb_eas = eas; 611 sbi->sb_chk = chk; 612 sbi->sb_chkdsk = chkdsk; 613 sbi->sb_err = errs; 614 sbi->sb_timeshift = timeshift; 615 sbi->sb_was_error = 0; 616 sbi->sb_cp_table = NULL; 617 sbi->sb_c_bitmap = -1; 618 sbi->sb_max_fwd_alloc = 0xffffff; 619 620 if (sbi->sb_fs_size >= 0x80000000) { 621 hpfs_error(s, "invalid size in superblock: %08x", 622 (unsigned)sbi->sb_fs_size); 623 goto bail4; 624 } 625 626 /* Load bitmap directory */ 627 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) 628 goto bail4; 629 630 /* Check for general fs errors*/ 631 if (spareblock->dirty && !spareblock->old_wrote) { 632 if (errs == 2) { 633 pr_err("Improperly stopped, not mounted\n"); 634 goto bail4; 635 } 636 hpfs_error(s, "improperly stopped"); 637 } 638 639 if (!(s->s_flags & MS_RDONLY)) { 640 spareblock->dirty = 1; 641 spareblock->old_wrote = 0; 642 mark_buffer_dirty(bh2); 643 } 644 645 if (spareblock->hotfixes_used || spareblock->n_spares_used) { 646 if (errs >= 2) { 647 pr_err("Hotfixes not supported here, try chkdsk\n"); 648 mark_dirty(s, 0); 649 goto bail4; 650 } 651 hpfs_error(s, "hotfixes not supported here, try chkdsk"); 652 if (errs == 0) 653 pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n"); 654 else 655 pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n"); 656 } 657 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { 658 if (errs >= 2) { 659 pr_err("Spare dnodes used, try chkdsk\n"); 660 mark_dirty(s, 0); 661 goto bail4; 662 } 663 hpfs_error(s, "warning: spare dnodes used, try chkdsk"); 664 if (errs == 0) 665 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); 666 } 667 if (chk) { 668 unsigned a; 669 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || 670 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { 671 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", 672 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); 673 goto bail4; 674 } 675 a = sbi->sb_dirband_size; 676 sbi->sb_dirband_size = 0; 677 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || 678 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || 679 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { 680 mark_dirty(s, 0); 681 goto bail4; 682 } 683 sbi->sb_dirband_size = a; 684 } else 685 pr_err("You really don't want any checks? You are crazy...\n"); 686 687 /* Load code page table */ 688 if (le32_to_cpu(spareblock->n_code_pages)) 689 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) 690 pr_err("code page support is disabled\n"); 691 692 brelse(bh2); 693 brelse(bh1); 694 brelse(bh0); 695 696 root = iget_locked(s, sbi->sb_root); 697 if (!root) 698 goto bail0; 699 hpfs_init_inode(root); 700 hpfs_read_inode(root); 701 unlock_new_inode(root); 702 s->s_root = d_make_root(root); 703 if (!s->s_root) 704 goto bail0; 705 706 /* 707 * find the root directory's . pointer & finish filling in the inode 708 */ 709 710 root_dno = hpfs_fnode_dno(s, sbi->sb_root); 711 if (root_dno) 712 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); 713 if (!de) 714 hpfs_error(s, "unable to find root dir"); 715 else { 716 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); 717 root->i_atime.tv_nsec = 0; 718 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); 719 root->i_mtime.tv_nsec = 0; 720 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); 721 root->i_ctime.tv_nsec = 0; 722 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); 723 hpfs_i(root)->i_parent_dir = root->i_ino; 724 if (root->i_size == -1) 725 root->i_size = 2048; 726 if (root->i_blocks == -1) 727 root->i_blocks = 5; 728 hpfs_brelse4(&qbh); 729 } 730 hpfs_unlock(s); 731 return 0; 732 733bail4: brelse(bh2); 734bail3: brelse(bh1); 735bail2: brelse(bh0); 736bail1: 737bail0: 738 hpfs_unlock(s); 739 free_sbi(sbi); 740 return -EINVAL; 741} 742 743static struct dentry *hpfs_mount(struct file_system_type *fs_type, 744 int flags, const char *dev_name, void *data) 745{ 746 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); 747} 748 749static struct file_system_type hpfs_fs_type = { 750 .owner = THIS_MODULE, 751 .name = "hpfs", 752 .mount = hpfs_mount, 753 .kill_sb = kill_block_super, 754 .fs_flags = FS_REQUIRES_DEV, 755}; 756MODULE_ALIAS_FS("hpfs"); 757 758static int __init init_hpfs_fs(void) 759{ 760 int err = init_inodecache(); 761 if (err) 762 goto out1; 763 err = register_filesystem(&hpfs_fs_type); 764 if (err) 765 goto out; 766 return 0; 767out: 768 destroy_inodecache(); 769out1: 770 return err; 771} 772 773static void __exit exit_hpfs_fs(void) 774{ 775 unregister_filesystem(&hpfs_fs_type); 776 destroy_inodecache(); 777} 778 779module_init(init_hpfs_fs) 780module_exit(exit_hpfs_fs) 781MODULE_LICENSE("GPL"); 782