1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/hpfs/super.c 4 * 5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 6 * 7 * mounting, unmounting, error handling 8 */ 9 10 #include "hpfs_fn.h" 11 #include <linux/module.h> 12 #include <linux/parser.h> 13 #include <linux/init.h> 14 #include <linux/statfs.h> 15 #include <linux/magic.h> 16 #include <linux/sched.h> 17 #include <linux/bitmap.h> 18 #include <linux/slab.h> 19 #include <linux/seq_file.h> 20 21 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ 22 23 static void mark_dirty(struct super_block *s, int remount) 24 { 25 if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) { 26 struct buffer_head *bh; 27 struct hpfs_spare_block *sb; 28 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 29 sb->dirty = 1; 30 sb->old_wrote = 0; 31 mark_buffer_dirty(bh); 32 sync_dirty_buffer(bh); 33 brelse(bh); 34 } 35 } 36 } 37 38 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there 39 were errors) */ 40 41 static void unmark_dirty(struct super_block *s) 42 { 43 struct buffer_head *bh; 44 struct hpfs_spare_block *sb; 45 if (sb_rdonly(s)) return; 46 sync_blockdev(s->s_bdev); 47 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 48 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error; 49 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error; 50 mark_buffer_dirty(bh); 51 sync_dirty_buffer(bh); 52 brelse(bh); 53 } 54 } 55 56 /* Filesystem error... */ 57 void hpfs_error(struct super_block *s, const char *fmt, ...) 58 { 59 struct va_format vaf; 60 va_list args; 61 62 va_start(args, fmt); 63 64 vaf.fmt = fmt; 65 vaf.va = &args; 66 67 pr_err("filesystem error: %pV", &vaf); 68 69 va_end(args); 70 71 if (!hpfs_sb(s)->sb_was_error) { 72 if (hpfs_sb(s)->sb_err == 2) { 73 pr_cont("; crashing the system because you wanted it\n"); 74 mark_dirty(s, 0); 75 panic("HPFS panic"); 76 } else if (hpfs_sb(s)->sb_err == 1) { 77 if (sb_rdonly(s)) 78 pr_cont("; already mounted read-only\n"); 79 else { 80 pr_cont("; remounting read-only\n"); 81 mark_dirty(s, 0); 82 s->s_flags |= SB_RDONLY; 83 } 84 } else if (sb_rdonly(s)) 85 pr_cont("; going on - but anything won't be destroyed because it's read-only\n"); 86 else 87 pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); 88 } else 89 pr_cont("\n"); 90 hpfs_sb(s)->sb_was_error = 1; 91 } 92 93 /* 94 * A little trick to detect cycles in many hpfs structures and don't let the 95 * kernel crash on corrupted filesystem. When first called, set c2 to 0. 96 * 97 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories 98 * nested each in other, chkdsk locked up happilly. 99 */ 100 101 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, 102 char *msg) 103 { 104 if (*c2 && *c1 == key) { 105 hpfs_error(s, "cycle detected on key %08x in %s", key, msg); 106 return 1; 107 } 108 (*c2)++; 109 if (!((*c2 - 1) & *c2)) *c1 = key; 110 return 0; 111 } 112 113 static void free_sbi(struct hpfs_sb_info *sbi) 114 { 115 kfree(sbi->sb_cp_table); 116 kfree(sbi->sb_bmp_dir); 117 kfree(sbi); 118 } 119 120 static void lazy_free_sbi(struct rcu_head *rcu) 121 { 122 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); 123 } 124 125 static void hpfs_put_super(struct super_block *s) 126 { 127 hpfs_lock(s); 128 unmark_dirty(s); 129 hpfs_unlock(s); 130 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); 131 } 132 133 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) 134 { 135 struct quad_buffer_head qbh; 136 unsigned long *bits; 137 unsigned count; 138 139 bits = hpfs_map_4sectors(s, secno, &qbh, 0); 140 if (!bits) 141 return (unsigned)-1; 142 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); 143 hpfs_brelse4(&qbh); 144 return count; 145 } 146 147 static unsigned count_bitmaps(struct super_block *s) 148 { 149 unsigned n, count, n_bands; 150 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; 151 count = 0; 152 for (n = 0; n < COUNT_RD_AHEAD; n++) { 153 hpfs_prefetch_bitmap(s, n); 154 } 155 for (n = 0; n < n_bands; n++) { 156 unsigned c; 157 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); 158 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); 159 if (c != (unsigned)-1) 160 count += c; 161 } 162 return count; 163 } 164 165 unsigned hpfs_get_free_dnodes(struct super_block *s) 166 { 167 struct hpfs_sb_info *sbi = hpfs_sb(s); 168 if (sbi->sb_n_free_dnodes == (unsigned)-1) { 169 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap); 170 if (c == (unsigned)-1) 171 return 0; 172 sbi->sb_n_free_dnodes = c; 173 } 174 return sbi->sb_n_free_dnodes; 175 } 176 177 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) 178 { 179 struct super_block *s = dentry->d_sb; 180 struct hpfs_sb_info *sbi = hpfs_sb(s); 181 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 182 183 hpfs_lock(s); 184 185 if (sbi->sb_n_free == (unsigned)-1) 186 sbi->sb_n_free = count_bitmaps(s); 187 188 buf->f_type = s->s_magic; 189 buf->f_bsize = 512; 190 buf->f_blocks = sbi->sb_fs_size; 191 buf->f_bfree = sbi->sb_n_free; 192 buf->f_bavail = sbi->sb_n_free; 193 buf->f_files = sbi->sb_dirband_size / 4; 194 buf->f_ffree = hpfs_get_free_dnodes(s); 195 buf->f_fsid = u64_to_fsid(id); 196 buf->f_namelen = 254; 197 198 hpfs_unlock(s); 199 200 return 0; 201 } 202 203 204 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg) 205 { 206 switch (cmd) { 207 case FITRIM: { 208 struct fstrim_range range; 209 secno n_trimmed; 210 int r; 211 if (!capable(CAP_SYS_ADMIN)) 212 return -EPERM; 213 if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) 214 return -EFAULT; 215 r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed); 216 if (r) 217 return r; 218 range.len = (u64)n_trimmed << 9; 219 if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range))) 220 return -EFAULT; 221 return 0; 222 } 223 default: { 224 return -ENOIOCTLCMD; 225 } 226 } 227 } 228 229 230 static struct kmem_cache * hpfs_inode_cachep; 231 232 static struct inode *hpfs_alloc_inode(struct super_block *sb) 233 { 234 struct hpfs_inode_info *ei; 235 ei = alloc_inode_sb(sb, hpfs_inode_cachep, GFP_NOFS); 236 if (!ei) 237 return NULL; 238 return &ei->vfs_inode; 239 } 240 241 static void hpfs_free_inode(struct inode *inode) 242 { 243 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); 244 } 245 246 static void init_once(void *foo) 247 { 248 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; 249 250 inode_init_once(&ei->vfs_inode); 251 } 252 253 static int init_inodecache(void) 254 { 255 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", 256 sizeof(struct hpfs_inode_info), 257 0, (SLAB_RECLAIM_ACCOUNT| 258 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 259 init_once); 260 if (hpfs_inode_cachep == NULL) 261 return -ENOMEM; 262 return 0; 263 } 264 265 static void destroy_inodecache(void) 266 { 267 /* 268 * Make sure all delayed rcu free inodes are flushed before we 269 * destroy cache. 270 */ 271 rcu_barrier(); 272 kmem_cache_destroy(hpfs_inode_cachep); 273 } 274 275 /* 276 * A tiny parser for option strings, stolen from dosfs. 277 * Stolen again from read-only hpfs. 278 * And updated for table-driven option parsing. 279 */ 280 281 enum { 282 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, 283 Opt_check_none, Opt_check_normal, Opt_check_strict, 284 Opt_err_cont, Opt_err_ro, Opt_err_panic, 285 Opt_eas_no, Opt_eas_ro, Opt_eas_rw, 286 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, 287 Opt_timeshift, Opt_err, 288 }; 289 290 static const match_table_t tokens = { 291 {Opt_help, "help"}, 292 {Opt_uid, "uid=%u"}, 293 {Opt_gid, "gid=%u"}, 294 {Opt_umask, "umask=%o"}, 295 {Opt_case_lower, "case=lower"}, 296 {Opt_case_asis, "case=asis"}, 297 {Opt_check_none, "check=none"}, 298 {Opt_check_normal, "check=normal"}, 299 {Opt_check_strict, "check=strict"}, 300 {Opt_err_cont, "errors=continue"}, 301 {Opt_err_ro, "errors=remount-ro"}, 302 {Opt_err_panic, "errors=panic"}, 303 {Opt_eas_no, "eas=no"}, 304 {Opt_eas_ro, "eas=ro"}, 305 {Opt_eas_rw, "eas=rw"}, 306 {Opt_chkdsk_no, "chkdsk=no"}, 307 {Opt_chkdsk_errors, "chkdsk=errors"}, 308 {Opt_chkdsk_always, "chkdsk=always"}, 309 {Opt_timeshift, "timeshift=%d"}, 310 {Opt_err, NULL}, 311 }; 312 313 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, 314 int *lowercase, int *eas, int *chk, int *errs, 315 int *chkdsk, int *timeshift) 316 { 317 char *p; 318 int option; 319 320 if (!opts) 321 return 1; 322 323 /*pr_info("Parsing opts: '%s'\n",opts);*/ 324 325 while ((p = strsep(&opts, ",")) != NULL) { 326 substring_t args[MAX_OPT_ARGS]; 327 int token; 328 if (!*p) 329 continue; 330 331 token = match_token(p, tokens, args); 332 switch (token) { 333 case Opt_help: 334 return 2; 335 case Opt_uid: 336 if (match_int(args, &option)) 337 return 0; 338 *uid = make_kuid(current_user_ns(), option); 339 if (!uid_valid(*uid)) 340 return 0; 341 break; 342 case Opt_gid: 343 if (match_int(args, &option)) 344 return 0; 345 *gid = make_kgid(current_user_ns(), option); 346 if (!gid_valid(*gid)) 347 return 0; 348 break; 349 case Opt_umask: 350 if (match_octal(args, &option)) 351 return 0; 352 *umask = option; 353 break; 354 case Opt_case_lower: 355 *lowercase = 1; 356 break; 357 case Opt_case_asis: 358 *lowercase = 0; 359 break; 360 case Opt_check_none: 361 *chk = 0; 362 break; 363 case Opt_check_normal: 364 *chk = 1; 365 break; 366 case Opt_check_strict: 367 *chk = 2; 368 break; 369 case Opt_err_cont: 370 *errs = 0; 371 break; 372 case Opt_err_ro: 373 *errs = 1; 374 break; 375 case Opt_err_panic: 376 *errs = 2; 377 break; 378 case Opt_eas_no: 379 *eas = 0; 380 break; 381 case Opt_eas_ro: 382 *eas = 1; 383 break; 384 case Opt_eas_rw: 385 *eas = 2; 386 break; 387 case Opt_chkdsk_no: 388 *chkdsk = 0; 389 break; 390 case Opt_chkdsk_errors: 391 *chkdsk = 1; 392 break; 393 case Opt_chkdsk_always: 394 *chkdsk = 2; 395 break; 396 case Opt_timeshift: 397 { 398 int m = 1; 399 char *rhs = args[0].from; 400 if (!rhs || !*rhs) 401 return 0; 402 if (*rhs == '-') m = -1; 403 if (*rhs == '+' || *rhs == '-') rhs++; 404 *timeshift = simple_strtoul(rhs, &rhs, 0) * m; 405 if (*rhs) 406 return 0; 407 break; 408 } 409 default: 410 return 0; 411 } 412 } 413 return 1; 414 } 415 416 static inline void hpfs_help(void) 417 { 418 pr_info("\n\ 419 HPFS filesystem options:\n\ 420 help do not mount and display this text\n\ 421 uid=xxx set uid of files that don't have uid specified in eas\n\ 422 gid=xxx set gid of files that don't have gid specified in eas\n\ 423 umask=xxx set mode of files that don't have mode specified in eas\n\ 424 case=lower lowercase all files\n\ 425 case=asis do not lowercase files (default)\n\ 426 check=none no fs checks - kernel may crash on corrupted filesystem\n\ 427 check=normal do some checks - it should not crash (default)\n\ 428 check=strict do extra time-consuming checks, used for debugging\n\ 429 errors=continue continue on errors\n\ 430 errors=remount-ro remount read-only if errors found (default)\n\ 431 errors=panic panic on errors\n\ 432 chkdsk=no do not mark fs for chkdsking even if there were errors\n\ 433 chkdsk=errors mark fs dirty if errors found (default)\n\ 434 chkdsk=always always mark fs dirty - used for debugging\n\ 435 eas=no ignore extended attributes\n\ 436 eas=ro read but do not write extended attributes\n\ 437 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ 438 timeshift=nnn add nnn seconds to file times\n\ 439 \n"); 440 } 441 442 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) 443 { 444 kuid_t uid; 445 kgid_t gid; 446 umode_t umask; 447 int lowercase, eas, chk, errs, chkdsk, timeshift; 448 int o; 449 struct hpfs_sb_info *sbi = hpfs_sb(s); 450 451 sync_filesystem(s); 452 453 *flags |= SB_NOATIME; 454 455 hpfs_lock(s); 456 uid = sbi->sb_uid; gid = sbi->sb_gid; 457 umask = 0777 & ~sbi->sb_mode; 458 lowercase = sbi->sb_lowercase; 459 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; 460 errs = sbi->sb_err; timeshift = sbi->sb_timeshift; 461 462 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, 463 &eas, &chk, &errs, &chkdsk, ×hift))) { 464 pr_err("bad mount options.\n"); 465 goto out_err; 466 } 467 if (o == 2) { 468 hpfs_help(); 469 goto out_err; 470 } 471 if (timeshift != sbi->sb_timeshift) { 472 pr_err("timeshift can't be changed using remount.\n"); 473 goto out_err; 474 } 475 476 unmark_dirty(s); 477 478 sbi->sb_uid = uid; sbi->sb_gid = gid; 479 sbi->sb_mode = 0777 & ~umask; 480 sbi->sb_lowercase = lowercase; 481 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; 482 sbi->sb_err = errs; sbi->sb_timeshift = timeshift; 483 484 if (!(*flags & SB_RDONLY)) mark_dirty(s, 1); 485 486 hpfs_unlock(s); 487 return 0; 488 489 out_err: 490 hpfs_unlock(s); 491 return -EINVAL; 492 } 493 494 static int hpfs_show_options(struct seq_file *seq, struct dentry *root) 495 { 496 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb); 497 498 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid)); 499 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid)); 500 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777)); 501 if (sbi->sb_lowercase) 502 seq_printf(seq, ",case=lower"); 503 if (!sbi->sb_chk) 504 seq_printf(seq, ",check=none"); 505 if (sbi->sb_chk == 2) 506 seq_printf(seq, ",check=strict"); 507 if (!sbi->sb_err) 508 seq_printf(seq, ",errors=continue"); 509 if (sbi->sb_err == 2) 510 seq_printf(seq, ",errors=panic"); 511 if (!sbi->sb_chkdsk) 512 seq_printf(seq, ",chkdsk=no"); 513 if (sbi->sb_chkdsk == 2) 514 seq_printf(seq, ",chkdsk=always"); 515 if (!sbi->sb_eas) 516 seq_printf(seq, ",eas=no"); 517 if (sbi->sb_eas == 1) 518 seq_printf(seq, ",eas=ro"); 519 if (sbi->sb_timeshift) 520 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift); 521 return 0; 522 } 523 524 /* Super operations */ 525 526 static const struct super_operations hpfs_sops = 527 { 528 .alloc_inode = hpfs_alloc_inode, 529 .free_inode = hpfs_free_inode, 530 .evict_inode = hpfs_evict_inode, 531 .put_super = hpfs_put_super, 532 .statfs = hpfs_statfs, 533 .remount_fs = hpfs_remount_fs, 534 .show_options = hpfs_show_options, 535 }; 536 537 static int hpfs_fill_super(struct super_block *s, void *options, int silent) 538 { 539 struct buffer_head *bh0, *bh1, *bh2; 540 struct hpfs_boot_block *bootblock; 541 struct hpfs_super_block *superblock; 542 struct hpfs_spare_block *spareblock; 543 struct hpfs_sb_info *sbi; 544 struct inode *root; 545 546 kuid_t uid; 547 kgid_t gid; 548 umode_t umask; 549 int lowercase, eas, chk, errs, chkdsk, timeshift; 550 551 dnode_secno root_dno; 552 struct hpfs_dirent *de = NULL; 553 struct quad_buffer_head qbh; 554 555 int o; 556 557 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 558 if (!sbi) { 559 return -ENOMEM; 560 } 561 s->s_fs_info = sbi; 562 563 mutex_init(&sbi->hpfs_mutex); 564 hpfs_lock(s); 565 566 uid = current_uid(); 567 gid = current_gid(); 568 umask = current_umask(); 569 lowercase = 0; 570 eas = 2; 571 chk = 1; 572 errs = 1; 573 chkdsk = 1; 574 timeshift = 0; 575 576 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, 577 &eas, &chk, &errs, &chkdsk, ×hift))) { 578 pr_err("bad mount options.\n"); 579 goto bail0; 580 } 581 if (o==2) { 582 hpfs_help(); 583 goto bail0; 584 } 585 586 /*sbi->sb_mounting = 1;*/ 587 sb_set_blocksize(s, 512); 588 sbi->sb_fs_size = -1; 589 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; 590 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; 591 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; 592 593 /* Check magics */ 594 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC 595 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC 596 || le32_to_cpu(spareblock->magic) != SP_MAGIC) { 597 if (!silent) 598 pr_err("Bad magic ... probably not HPFS\n"); 599 goto bail4; 600 } 601 602 /* Check version */ 603 if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) { 604 pr_err("Bad version %d,%d. Mount readonly to go around\n", 605 (int)superblock->version, (int)superblock->funcversion); 606 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"); 607 goto bail4; 608 } 609 610 s->s_flags |= SB_NOATIME; 611 612 /* Fill superblock stuff */ 613 s->s_magic = HPFS_SUPER_MAGIC; 614 s->s_op = &hpfs_sops; 615 s->s_d_op = &hpfs_dentry_operations; 616 s->s_time_min = local_to_gmt(s, 0); 617 s->s_time_max = local_to_gmt(s, U32_MAX); 618 619 sbi->sb_root = le32_to_cpu(superblock->root); 620 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); 621 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); 622 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); 623 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); 624 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); 625 sbi->sb_uid = uid; 626 sbi->sb_gid = gid; 627 sbi->sb_mode = 0777 & ~umask; 628 sbi->sb_n_free = -1; 629 sbi->sb_n_free_dnodes = -1; 630 sbi->sb_lowercase = lowercase; 631 sbi->sb_eas = eas; 632 sbi->sb_chk = chk; 633 sbi->sb_chkdsk = chkdsk; 634 sbi->sb_err = errs; 635 sbi->sb_timeshift = timeshift; 636 sbi->sb_was_error = 0; 637 sbi->sb_cp_table = NULL; 638 sbi->sb_c_bitmap = -1; 639 sbi->sb_max_fwd_alloc = 0xffffff; 640 641 if (sbi->sb_fs_size >= 0x80000000) { 642 hpfs_error(s, "invalid size in superblock: %08x", 643 (unsigned)sbi->sb_fs_size); 644 goto bail4; 645 } 646 647 if (spareblock->n_spares_used) 648 hpfs_load_hotfix_map(s, spareblock); 649 650 /* Load bitmap directory */ 651 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) 652 goto bail4; 653 654 /* Check for general fs errors*/ 655 if (spareblock->dirty && !spareblock->old_wrote) { 656 if (errs == 2) { 657 pr_err("Improperly stopped, not mounted\n"); 658 goto bail4; 659 } 660 hpfs_error(s, "improperly stopped"); 661 } 662 663 if (!sb_rdonly(s)) { 664 spareblock->dirty = 1; 665 spareblock->old_wrote = 0; 666 mark_buffer_dirty(bh2); 667 } 668 669 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { 670 if (errs >= 2) { 671 pr_err("Spare dnodes used, try chkdsk\n"); 672 mark_dirty(s, 0); 673 goto bail4; 674 } 675 hpfs_error(s, "warning: spare dnodes used, try chkdsk"); 676 if (errs == 0) 677 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); 678 } 679 if (chk) { 680 unsigned a; 681 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || 682 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { 683 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", 684 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); 685 goto bail4; 686 } 687 a = sbi->sb_dirband_size; 688 sbi->sb_dirband_size = 0; 689 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || 690 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || 691 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { 692 mark_dirty(s, 0); 693 goto bail4; 694 } 695 sbi->sb_dirband_size = a; 696 } else 697 pr_err("You really don't want any checks? You are crazy...\n"); 698 699 /* Load code page table */ 700 if (le32_to_cpu(spareblock->n_code_pages)) 701 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) 702 pr_err("code page support is disabled\n"); 703 704 brelse(bh2); 705 brelse(bh1); 706 brelse(bh0); 707 708 root = iget_locked(s, sbi->sb_root); 709 if (!root) 710 goto bail0; 711 hpfs_init_inode(root); 712 hpfs_read_inode(root); 713 unlock_new_inode(root); 714 s->s_root = d_make_root(root); 715 if (!s->s_root) 716 goto bail0; 717 718 /* 719 * find the root directory's . pointer & finish filling in the inode 720 */ 721 722 root_dno = hpfs_fnode_dno(s, sbi->sb_root); 723 if (root_dno) 724 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); 725 if (!de) 726 hpfs_error(s, "unable to find root dir"); 727 else { 728 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); 729 root->i_atime.tv_nsec = 0; 730 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); 731 root->i_mtime.tv_nsec = 0; 732 inode_set_ctime(root, 733 local_to_gmt(s, le32_to_cpu(de->creation_date)), 734 0); 735 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); 736 hpfs_i(root)->i_parent_dir = root->i_ino; 737 if (root->i_size == -1) 738 root->i_size = 2048; 739 if (root->i_blocks == -1) 740 root->i_blocks = 5; 741 hpfs_brelse4(&qbh); 742 } 743 hpfs_unlock(s); 744 return 0; 745 746 bail4: brelse(bh2); 747 bail3: brelse(bh1); 748 bail2: brelse(bh0); 749 bail1: 750 bail0: 751 hpfs_unlock(s); 752 free_sbi(sbi); 753 return -EINVAL; 754 } 755 756 static struct dentry *hpfs_mount(struct file_system_type *fs_type, 757 int flags, const char *dev_name, void *data) 758 { 759 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); 760 } 761 762 static struct file_system_type hpfs_fs_type = { 763 .owner = THIS_MODULE, 764 .name = "hpfs", 765 .mount = hpfs_mount, 766 .kill_sb = kill_block_super, 767 .fs_flags = FS_REQUIRES_DEV, 768 }; 769 MODULE_ALIAS_FS("hpfs"); 770 771 static int __init init_hpfs_fs(void) 772 { 773 int err = init_inodecache(); 774 if (err) 775 goto out1; 776 err = register_filesystem(&hpfs_fs_type); 777 if (err) 778 goto out; 779 return 0; 780 out: 781 destroy_inodecache(); 782 out1: 783 return err; 784 } 785 786 static void __exit exit_hpfs_fs(void) 787 { 788 unregister_filesystem(&hpfs_fs_type); 789 destroy_inodecache(); 790 } 791 792 module_init(init_hpfs_fs) 793 module_exit(exit_hpfs_fs) 794 MODULE_LICENSE("GPL"); 795