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.val[0] = (u32)id; 196 buf->f_fsid.val[1] = (u32)(id >> 32); 197 buf->f_namelen = 254; 198 199 hpfs_unlock(s); 200 201 return 0; 202 } 203 204 205 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg) 206 { 207 switch (cmd) { 208 case FITRIM: { 209 struct fstrim_range range; 210 secno n_trimmed; 211 int r; 212 if (!capable(CAP_SYS_ADMIN)) 213 return -EPERM; 214 if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) 215 return -EFAULT; 216 r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed); 217 if (r) 218 return r; 219 range.len = (u64)n_trimmed << 9; 220 if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range))) 221 return -EFAULT; 222 return 0; 223 } 224 default: { 225 return -ENOIOCTLCMD; 226 } 227 } 228 } 229 230 231 static struct kmem_cache * hpfs_inode_cachep; 232 233 static struct inode *hpfs_alloc_inode(struct super_block *sb) 234 { 235 struct hpfs_inode_info *ei; 236 ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); 237 if (!ei) 238 return NULL; 239 return &ei->vfs_inode; 240 } 241 242 static void hpfs_free_inode(struct inode *inode) 243 { 244 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); 245 } 246 247 static void init_once(void *foo) 248 { 249 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; 250 251 inode_init_once(&ei->vfs_inode); 252 } 253 254 static int init_inodecache(void) 255 { 256 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", 257 sizeof(struct hpfs_inode_info), 258 0, (SLAB_RECLAIM_ACCOUNT| 259 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 260 init_once); 261 if (hpfs_inode_cachep == NULL) 262 return -ENOMEM; 263 return 0; 264 } 265 266 static void destroy_inodecache(void) 267 { 268 /* 269 * Make sure all delayed rcu free inodes are flushed before we 270 * destroy cache. 271 */ 272 rcu_barrier(); 273 kmem_cache_destroy(hpfs_inode_cachep); 274 } 275 276 /* 277 * A tiny parser for option strings, stolen from dosfs. 278 * Stolen again from read-only hpfs. 279 * And updated for table-driven option parsing. 280 */ 281 282 enum { 283 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, 284 Opt_check_none, Opt_check_normal, Opt_check_strict, 285 Opt_err_cont, Opt_err_ro, Opt_err_panic, 286 Opt_eas_no, Opt_eas_ro, Opt_eas_rw, 287 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, 288 Opt_timeshift, Opt_err, 289 }; 290 291 static const match_table_t tokens = { 292 {Opt_help, "help"}, 293 {Opt_uid, "uid=%u"}, 294 {Opt_gid, "gid=%u"}, 295 {Opt_umask, "umask=%o"}, 296 {Opt_case_lower, "case=lower"}, 297 {Opt_case_asis, "case=asis"}, 298 {Opt_check_none, "check=none"}, 299 {Opt_check_normal, "check=normal"}, 300 {Opt_check_strict, "check=strict"}, 301 {Opt_err_cont, "errors=continue"}, 302 {Opt_err_ro, "errors=remount-ro"}, 303 {Opt_err_panic, "errors=panic"}, 304 {Opt_eas_no, "eas=no"}, 305 {Opt_eas_ro, "eas=ro"}, 306 {Opt_eas_rw, "eas=rw"}, 307 {Opt_chkdsk_no, "chkdsk=no"}, 308 {Opt_chkdsk_errors, "chkdsk=errors"}, 309 {Opt_chkdsk_always, "chkdsk=always"}, 310 {Opt_timeshift, "timeshift=%d"}, 311 {Opt_err, NULL}, 312 }; 313 314 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, 315 int *lowercase, int *eas, int *chk, int *errs, 316 int *chkdsk, int *timeshift) 317 { 318 char *p; 319 int option; 320 321 if (!opts) 322 return 1; 323 324 /*pr_info("Parsing opts: '%s'\n",opts);*/ 325 326 while ((p = strsep(&opts, ",")) != NULL) { 327 substring_t args[MAX_OPT_ARGS]; 328 int token; 329 if (!*p) 330 continue; 331 332 token = match_token(p, tokens, args); 333 switch (token) { 334 case Opt_help: 335 return 2; 336 case Opt_uid: 337 if (match_int(args, &option)) 338 return 0; 339 *uid = make_kuid(current_user_ns(), option); 340 if (!uid_valid(*uid)) 341 return 0; 342 break; 343 case Opt_gid: 344 if (match_int(args, &option)) 345 return 0; 346 *gid = make_kgid(current_user_ns(), option); 347 if (!gid_valid(*gid)) 348 return 0; 349 break; 350 case Opt_umask: 351 if (match_octal(args, &option)) 352 return 0; 353 *umask = option; 354 break; 355 case Opt_case_lower: 356 *lowercase = 1; 357 break; 358 case Opt_case_asis: 359 *lowercase = 0; 360 break; 361 case Opt_check_none: 362 *chk = 0; 363 break; 364 case Opt_check_normal: 365 *chk = 1; 366 break; 367 case Opt_check_strict: 368 *chk = 2; 369 break; 370 case Opt_err_cont: 371 *errs = 0; 372 break; 373 case Opt_err_ro: 374 *errs = 1; 375 break; 376 case Opt_err_panic: 377 *errs = 2; 378 break; 379 case Opt_eas_no: 380 *eas = 0; 381 break; 382 case Opt_eas_ro: 383 *eas = 1; 384 break; 385 case Opt_eas_rw: 386 *eas = 2; 387 break; 388 case Opt_chkdsk_no: 389 *chkdsk = 0; 390 break; 391 case Opt_chkdsk_errors: 392 *chkdsk = 1; 393 break; 394 case Opt_chkdsk_always: 395 *chkdsk = 2; 396 break; 397 case Opt_timeshift: 398 { 399 int m = 1; 400 char *rhs = args[0].from; 401 if (!rhs || !*rhs) 402 return 0; 403 if (*rhs == '-') m = -1; 404 if (*rhs == '+' || *rhs == '-') rhs++; 405 *timeshift = simple_strtoul(rhs, &rhs, 0) * m; 406 if (*rhs) 407 return 0; 408 break; 409 } 410 default: 411 return 0; 412 } 413 } 414 return 1; 415 } 416 417 static inline void hpfs_help(void) 418 { 419 pr_info("\n\ 420 HPFS filesystem options:\n\ 421 help do not mount and display this text\n\ 422 uid=xxx set uid of files that don't have uid specified in eas\n\ 423 gid=xxx set gid of files that don't have gid specified in eas\n\ 424 umask=xxx set mode of files that don't have mode specified in eas\n\ 425 case=lower lowercase all files\n\ 426 case=asis do not lowercase files (default)\n\ 427 check=none no fs checks - kernel may crash on corrupted filesystem\n\ 428 check=normal do some checks - it should not crash (default)\n\ 429 check=strict do extra time-consuming checks, used for debugging\n\ 430 errors=continue continue on errors\n\ 431 errors=remount-ro remount read-only if errors found (default)\n\ 432 errors=panic panic on errors\n\ 433 chkdsk=no do not mark fs for chkdsking even if there were errors\n\ 434 chkdsk=errors mark fs dirty if errors found (default)\n\ 435 chkdsk=always always mark fs dirty - used for debugging\n\ 436 eas=no ignore extended attributes\n\ 437 eas=ro read but do not write extended attributes\n\ 438 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ 439 timeshift=nnn add nnn seconds to file times\n\ 440 \n"); 441 } 442 443 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) 444 { 445 kuid_t uid; 446 kgid_t gid; 447 umode_t umask; 448 int lowercase, eas, chk, errs, chkdsk, timeshift; 449 int o; 450 struct hpfs_sb_info *sbi = hpfs_sb(s); 451 452 sync_filesystem(s); 453 454 *flags |= SB_NOATIME; 455 456 hpfs_lock(s); 457 uid = sbi->sb_uid; gid = sbi->sb_gid; 458 umask = 0777 & ~sbi->sb_mode; 459 lowercase = sbi->sb_lowercase; 460 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; 461 errs = sbi->sb_err; timeshift = sbi->sb_timeshift; 462 463 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, 464 &eas, &chk, &errs, &chkdsk, ×hift))) { 465 pr_err("bad mount options.\n"); 466 goto out_err; 467 } 468 if (o == 2) { 469 hpfs_help(); 470 goto out_err; 471 } 472 if (timeshift != sbi->sb_timeshift) { 473 pr_err("timeshift can't be changed using remount.\n"); 474 goto out_err; 475 } 476 477 unmark_dirty(s); 478 479 sbi->sb_uid = uid; sbi->sb_gid = gid; 480 sbi->sb_mode = 0777 & ~umask; 481 sbi->sb_lowercase = lowercase; 482 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; 483 sbi->sb_err = errs; sbi->sb_timeshift = timeshift; 484 485 if (!(*flags & SB_RDONLY)) mark_dirty(s, 1); 486 487 hpfs_unlock(s); 488 return 0; 489 490 out_err: 491 hpfs_unlock(s); 492 return -EINVAL; 493 } 494 495 static int hpfs_show_options(struct seq_file *seq, struct dentry *root) 496 { 497 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb); 498 499 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid)); 500 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid)); 501 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777)); 502 if (sbi->sb_lowercase) 503 seq_printf(seq, ",case=lower"); 504 if (!sbi->sb_chk) 505 seq_printf(seq, ",check=none"); 506 if (sbi->sb_chk == 2) 507 seq_printf(seq, ",check=strict"); 508 if (!sbi->sb_err) 509 seq_printf(seq, ",errors=continue"); 510 if (sbi->sb_err == 2) 511 seq_printf(seq, ",errors=panic"); 512 if (!sbi->sb_chkdsk) 513 seq_printf(seq, ",chkdsk=no"); 514 if (sbi->sb_chkdsk == 2) 515 seq_printf(seq, ",chkdsk=always"); 516 if (!sbi->sb_eas) 517 seq_printf(seq, ",eas=no"); 518 if (sbi->sb_eas == 1) 519 seq_printf(seq, ",eas=ro"); 520 if (sbi->sb_timeshift) 521 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift); 522 return 0; 523 } 524 525 /* Super operations */ 526 527 static const struct super_operations hpfs_sops = 528 { 529 .alloc_inode = hpfs_alloc_inode, 530 .free_inode = hpfs_free_inode, 531 .evict_inode = hpfs_evict_inode, 532 .put_super = hpfs_put_super, 533 .statfs = hpfs_statfs, 534 .remount_fs = hpfs_remount_fs, 535 .show_options = hpfs_show_options, 536 }; 537 538 static int hpfs_fill_super(struct super_block *s, void *options, int silent) 539 { 540 struct buffer_head *bh0, *bh1, *bh2; 541 struct hpfs_boot_block *bootblock; 542 struct hpfs_super_block *superblock; 543 struct hpfs_spare_block *spareblock; 544 struct hpfs_sb_info *sbi; 545 struct inode *root; 546 547 kuid_t uid; 548 kgid_t gid; 549 umode_t umask; 550 int lowercase, eas, chk, errs, chkdsk, timeshift; 551 552 dnode_secno root_dno; 553 struct hpfs_dirent *de = NULL; 554 struct quad_buffer_head qbh; 555 556 int o; 557 558 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 559 if (!sbi) { 560 return -ENOMEM; 561 } 562 s->s_fs_info = sbi; 563 564 mutex_init(&sbi->hpfs_mutex); 565 hpfs_lock(s); 566 567 uid = current_uid(); 568 gid = current_gid(); 569 umask = current_umask(); 570 lowercase = 0; 571 eas = 2; 572 chk = 1; 573 errs = 1; 574 chkdsk = 1; 575 timeshift = 0; 576 577 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, 578 &eas, &chk, &errs, &chkdsk, ×hift))) { 579 pr_err("bad mount options.\n"); 580 goto bail0; 581 } 582 if (o==2) { 583 hpfs_help(); 584 goto bail0; 585 } 586 587 /*sbi->sb_mounting = 1;*/ 588 sb_set_blocksize(s, 512); 589 sbi->sb_fs_size = -1; 590 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; 591 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; 592 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; 593 594 /* Check magics */ 595 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC 596 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC 597 || le32_to_cpu(spareblock->magic) != SP_MAGIC) { 598 if (!silent) 599 pr_err("Bad magic ... probably not HPFS\n"); 600 goto bail4; 601 } 602 603 /* Check version */ 604 if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) { 605 pr_err("Bad version %d,%d. Mount readonly to go around\n", 606 (int)superblock->version, (int)superblock->funcversion); 607 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"); 608 goto bail4; 609 } 610 611 s->s_flags |= SB_NOATIME; 612 613 /* Fill superblock stuff */ 614 s->s_magic = HPFS_SUPER_MAGIC; 615 s->s_op = &hpfs_sops; 616 s->s_d_op = &hpfs_dentry_operations; 617 s->s_time_min = local_to_gmt(s, 0); 618 s->s_time_max = local_to_gmt(s, U32_MAX); 619 620 sbi->sb_root = le32_to_cpu(superblock->root); 621 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); 622 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); 623 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); 624 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); 625 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); 626 sbi->sb_uid = uid; 627 sbi->sb_gid = gid; 628 sbi->sb_mode = 0777 & ~umask; 629 sbi->sb_n_free = -1; 630 sbi->sb_n_free_dnodes = -1; 631 sbi->sb_lowercase = lowercase; 632 sbi->sb_eas = eas; 633 sbi->sb_chk = chk; 634 sbi->sb_chkdsk = chkdsk; 635 sbi->sb_err = errs; 636 sbi->sb_timeshift = timeshift; 637 sbi->sb_was_error = 0; 638 sbi->sb_cp_table = NULL; 639 sbi->sb_c_bitmap = -1; 640 sbi->sb_max_fwd_alloc = 0xffffff; 641 642 if (sbi->sb_fs_size >= 0x80000000) { 643 hpfs_error(s, "invalid size in superblock: %08x", 644 (unsigned)sbi->sb_fs_size); 645 goto bail4; 646 } 647 648 if (spareblock->n_spares_used) 649 hpfs_load_hotfix_map(s, spareblock); 650 651 /* Load bitmap directory */ 652 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) 653 goto bail4; 654 655 /* Check for general fs errors*/ 656 if (spareblock->dirty && !spareblock->old_wrote) { 657 if (errs == 2) { 658 pr_err("Improperly stopped, not mounted\n"); 659 goto bail4; 660 } 661 hpfs_error(s, "improperly stopped"); 662 } 663 664 if (!sb_rdonly(s)) { 665 spareblock->dirty = 1; 666 spareblock->old_wrote = 0; 667 mark_buffer_dirty(bh2); 668 } 669 670 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { 671 if (errs >= 2) { 672 pr_err("Spare dnodes used, try chkdsk\n"); 673 mark_dirty(s, 0); 674 goto bail4; 675 } 676 hpfs_error(s, "warning: spare dnodes used, try chkdsk"); 677 if (errs == 0) 678 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); 679 } 680 if (chk) { 681 unsigned a; 682 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || 683 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { 684 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", 685 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); 686 goto bail4; 687 } 688 a = sbi->sb_dirband_size; 689 sbi->sb_dirband_size = 0; 690 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || 691 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || 692 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { 693 mark_dirty(s, 0); 694 goto bail4; 695 } 696 sbi->sb_dirband_size = a; 697 } else 698 pr_err("You really don't want any checks? You are crazy...\n"); 699 700 /* Load code page table */ 701 if (le32_to_cpu(spareblock->n_code_pages)) 702 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) 703 pr_err("code page support is disabled\n"); 704 705 brelse(bh2); 706 brelse(bh1); 707 brelse(bh0); 708 709 root = iget_locked(s, sbi->sb_root); 710 if (!root) 711 goto bail0; 712 hpfs_init_inode(root); 713 hpfs_read_inode(root); 714 unlock_new_inode(root); 715 s->s_root = d_make_root(root); 716 if (!s->s_root) 717 goto bail0; 718 719 /* 720 * find the root directory's . pointer & finish filling in the inode 721 */ 722 723 root_dno = hpfs_fnode_dno(s, sbi->sb_root); 724 if (root_dno) 725 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); 726 if (!de) 727 hpfs_error(s, "unable to find root dir"); 728 else { 729 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); 730 root->i_atime.tv_nsec = 0; 731 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); 732 root->i_mtime.tv_nsec = 0; 733 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); 734 root->i_ctime.tv_nsec = 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