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 22 static 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 40 static 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... */ 56 void 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 */ 99 100 int 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 } 111 112 static 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 } 118 119 static void lazy_free_sbi(struct rcu_head *rcu) 120 { 121 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); 122 } 123 124 static 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 } 131 132 static 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 } 145 146 static 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 } 163 164 unsigned 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 } 175 176 static 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 } 202 203 204 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 = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); 236 if (!ei) 237 return NULL; 238 ei->vfs_inode.i_version = 1; 239 return &ei->vfs_inode; 240 } 241 242 static void hpfs_i_callback(struct rcu_head *head) 243 { 244 struct inode *inode = container_of(head, struct inode, i_rcu); 245 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); 246 } 247 248 static void hpfs_destroy_inode(struct inode *inode) 249 { 250 call_rcu(&inode->i_rcu, hpfs_i_callback); 251 } 252 253 static void init_once(void *foo) 254 { 255 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; 256 257 inode_init_once(&ei->vfs_inode); 258 } 259 260 static int init_inodecache(void) 261 { 262 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", 263 sizeof(struct hpfs_inode_info), 264 0, (SLAB_RECLAIM_ACCOUNT| 265 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 266 init_once); 267 if (hpfs_inode_cachep == NULL) 268 return -ENOMEM; 269 return 0; 270 } 271 272 static void destroy_inodecache(void) 273 { 274 /* 275 * Make sure all delayed rcu free inodes are flushed before we 276 * destroy cache. 277 */ 278 rcu_barrier(); 279 kmem_cache_destroy(hpfs_inode_cachep); 280 } 281 282 /* 283 * A tiny parser for option strings, stolen from dosfs. 284 * Stolen again from read-only hpfs. 285 * And updated for table-driven option parsing. 286 */ 287 288 enum { 289 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, 290 Opt_check_none, Opt_check_normal, Opt_check_strict, 291 Opt_err_cont, Opt_err_ro, Opt_err_panic, 292 Opt_eas_no, Opt_eas_ro, Opt_eas_rw, 293 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, 294 Opt_timeshift, Opt_err, 295 }; 296 297 static const match_table_t tokens = { 298 {Opt_help, "help"}, 299 {Opt_uid, "uid=%u"}, 300 {Opt_gid, "gid=%u"}, 301 {Opt_umask, "umask=%o"}, 302 {Opt_case_lower, "case=lower"}, 303 {Opt_case_asis, "case=asis"}, 304 {Opt_check_none, "check=none"}, 305 {Opt_check_normal, "check=normal"}, 306 {Opt_check_strict, "check=strict"}, 307 {Opt_err_cont, "errors=continue"}, 308 {Opt_err_ro, "errors=remount-ro"}, 309 {Opt_err_panic, "errors=panic"}, 310 {Opt_eas_no, "eas=no"}, 311 {Opt_eas_ro, "eas=ro"}, 312 {Opt_eas_rw, "eas=rw"}, 313 {Opt_chkdsk_no, "chkdsk=no"}, 314 {Opt_chkdsk_errors, "chkdsk=errors"}, 315 {Opt_chkdsk_always, "chkdsk=always"}, 316 {Opt_timeshift, "timeshift=%d"}, 317 {Opt_err, NULL}, 318 }; 319 320 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, 321 int *lowercase, int *eas, int *chk, int *errs, 322 int *chkdsk, int *timeshift) 323 { 324 char *p; 325 int option; 326 327 if (!opts) 328 return 1; 329 330 /*pr_info("Parsing opts: '%s'\n",opts);*/ 331 332 while ((p = strsep(&opts, ",")) != NULL) { 333 substring_t args[MAX_OPT_ARGS]; 334 int token; 335 if (!*p) 336 continue; 337 338 token = match_token(p, tokens, args); 339 switch (token) { 340 case Opt_help: 341 return 2; 342 case Opt_uid: 343 if (match_int(args, &option)) 344 return 0; 345 *uid = make_kuid(current_user_ns(), option); 346 if (!uid_valid(*uid)) 347 return 0; 348 break; 349 case Opt_gid: 350 if (match_int(args, &option)) 351 return 0; 352 *gid = make_kgid(current_user_ns(), option); 353 if (!gid_valid(*gid)) 354 return 0; 355 break; 356 case Opt_umask: 357 if (match_octal(args, &option)) 358 return 0; 359 *umask = option; 360 break; 361 case Opt_case_lower: 362 *lowercase = 1; 363 break; 364 case Opt_case_asis: 365 *lowercase = 0; 366 break; 367 case Opt_check_none: 368 *chk = 0; 369 break; 370 case Opt_check_normal: 371 *chk = 1; 372 break; 373 case Opt_check_strict: 374 *chk = 2; 375 break; 376 case Opt_err_cont: 377 *errs = 0; 378 break; 379 case Opt_err_ro: 380 *errs = 1; 381 break; 382 case Opt_err_panic: 383 *errs = 2; 384 break; 385 case Opt_eas_no: 386 *eas = 0; 387 break; 388 case Opt_eas_ro: 389 *eas = 1; 390 break; 391 case Opt_eas_rw: 392 *eas = 2; 393 break; 394 case Opt_chkdsk_no: 395 *chkdsk = 0; 396 break; 397 case Opt_chkdsk_errors: 398 *chkdsk = 1; 399 break; 400 case Opt_chkdsk_always: 401 *chkdsk = 2; 402 break; 403 case Opt_timeshift: 404 { 405 int m = 1; 406 char *rhs = args[0].from; 407 if (!rhs || !*rhs) 408 return 0; 409 if (*rhs == '-') m = -1; 410 if (*rhs == '+' || *rhs == '-') rhs++; 411 *timeshift = simple_strtoul(rhs, &rhs, 0) * m; 412 if (*rhs) 413 return 0; 414 break; 415 } 416 default: 417 return 0; 418 } 419 } 420 return 1; 421 } 422 423 static inline void hpfs_help(void) 424 { 425 pr_info("\n\ 426 HPFS filesystem options:\n\ 427 help do not mount and display this text\n\ 428 uid=xxx set uid of files that don't have uid specified in eas\n\ 429 gid=xxx set gid of files that don't have gid specified in eas\n\ 430 umask=xxx set mode of files that don't have mode specified in eas\n\ 431 case=lower lowercase all files\n\ 432 case=asis do not lowercase files (default)\n\ 433 check=none no fs checks - kernel may crash on corrupted filesystem\n\ 434 check=normal do some checks - it should not crash (default)\n\ 435 check=strict do extra time-consuming checks, used for debugging\n\ 436 errors=continue continue on errors\n\ 437 errors=remount-ro remount read-only if errors found (default)\n\ 438 errors=panic panic on errors\n\ 439 chkdsk=no do not mark fs for chkdsking even if there were errors\n\ 440 chkdsk=errors mark fs dirty if errors found (default)\n\ 441 chkdsk=always always mark fs dirty - used for debugging\n\ 442 eas=no ignore extended attributes\n\ 443 eas=ro read but do not write extended attributes\n\ 444 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ 445 timeshift=nnn add nnn seconds to file times\n\ 446 \n"); 447 } 448 449 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) 450 { 451 kuid_t uid; 452 kgid_t gid; 453 umode_t umask; 454 int lowercase, eas, chk, errs, chkdsk, timeshift; 455 int o; 456 struct hpfs_sb_info *sbi = hpfs_sb(s); 457 458 sync_filesystem(s); 459 460 *flags |= MS_NOATIME; 461 462 hpfs_lock(s); 463 uid = sbi->sb_uid; gid = sbi->sb_gid; 464 umask = 0777 & ~sbi->sb_mode; 465 lowercase = sbi->sb_lowercase; 466 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; 467 errs = sbi->sb_err; timeshift = sbi->sb_timeshift; 468 469 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, 470 &eas, &chk, &errs, &chkdsk, ×hift))) { 471 pr_err("bad mount options.\n"); 472 goto out_err; 473 } 474 if (o == 2) { 475 hpfs_help(); 476 goto out_err; 477 } 478 if (timeshift != sbi->sb_timeshift) { 479 pr_err("timeshift can't be changed using remount.\n"); 480 goto out_err; 481 } 482 483 unmark_dirty(s); 484 485 sbi->sb_uid = uid; sbi->sb_gid = gid; 486 sbi->sb_mode = 0777 & ~umask; 487 sbi->sb_lowercase = lowercase; 488 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; 489 sbi->sb_err = errs; sbi->sb_timeshift = timeshift; 490 491 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); 492 493 hpfs_unlock(s); 494 return 0; 495 496 out_err: 497 hpfs_unlock(s); 498 return -EINVAL; 499 } 500 501 static int hpfs_show_options(struct seq_file *seq, struct dentry *root) 502 { 503 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb); 504 505 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid)); 506 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid)); 507 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777)); 508 if (sbi->sb_lowercase) 509 seq_printf(seq, ",case=lower"); 510 if (!sbi->sb_chk) 511 seq_printf(seq, ",check=none"); 512 if (sbi->sb_chk == 2) 513 seq_printf(seq, ",check=strict"); 514 if (!sbi->sb_err) 515 seq_printf(seq, ",errors=continue"); 516 if (sbi->sb_err == 2) 517 seq_printf(seq, ",errors=panic"); 518 if (!sbi->sb_chkdsk) 519 seq_printf(seq, ",chkdsk=no"); 520 if (sbi->sb_chkdsk == 2) 521 seq_printf(seq, ",chkdsk=always"); 522 if (!sbi->sb_eas) 523 seq_printf(seq, ",eas=no"); 524 if (sbi->sb_eas == 1) 525 seq_printf(seq, ",eas=ro"); 526 if (sbi->sb_timeshift) 527 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift); 528 return 0; 529 } 530 531 /* Super operations */ 532 533 static const struct super_operations hpfs_sops = 534 { 535 .alloc_inode = hpfs_alloc_inode, 536 .destroy_inode = hpfs_destroy_inode, 537 .evict_inode = hpfs_evict_inode, 538 .put_super = hpfs_put_super, 539 .statfs = hpfs_statfs, 540 .remount_fs = hpfs_remount_fs, 541 .show_options = hpfs_show_options, 542 }; 543 544 static int hpfs_fill_super(struct super_block *s, void *options, int silent) 545 { 546 struct buffer_head *bh0, *bh1, *bh2; 547 struct hpfs_boot_block *bootblock; 548 struct hpfs_super_block *superblock; 549 struct hpfs_spare_block *spareblock; 550 struct hpfs_sb_info *sbi; 551 struct inode *root; 552 553 kuid_t uid; 554 kgid_t gid; 555 umode_t umask; 556 int lowercase, eas, chk, errs, chkdsk, timeshift; 557 558 dnode_secno root_dno; 559 struct hpfs_dirent *de = NULL; 560 struct quad_buffer_head qbh; 561 562 int o; 563 564 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 565 if (!sbi) { 566 return -ENOMEM; 567 } 568 s->s_fs_info = sbi; 569 570 mutex_init(&sbi->hpfs_mutex); 571 hpfs_lock(s); 572 573 uid = current_uid(); 574 gid = current_gid(); 575 umask = current_umask(); 576 lowercase = 0; 577 eas = 2; 578 chk = 1; 579 errs = 1; 580 chkdsk = 1; 581 timeshift = 0; 582 583 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, 584 &eas, &chk, &errs, &chkdsk, ×hift))) { 585 pr_err("bad mount options.\n"); 586 goto bail0; 587 } 588 if (o==2) { 589 hpfs_help(); 590 goto bail0; 591 } 592 593 /*sbi->sb_mounting = 1;*/ 594 sb_set_blocksize(s, 512); 595 sbi->sb_fs_size = -1; 596 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; 597 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; 598 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; 599 600 /* Check magics */ 601 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC 602 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC 603 || le32_to_cpu(spareblock->magic) != SP_MAGIC) { 604 if (!silent) 605 pr_err("Bad magic ... probably not HPFS\n"); 606 goto bail4; 607 } 608 609 /* Check version */ 610 if (!(s->s_flags & MS_RDONLY) && 611 superblock->funcversion != 2 && superblock->funcversion != 3) { 612 pr_err("Bad version %d,%d. Mount readonly to go around\n", 613 (int)superblock->version, (int)superblock->funcversion); 614 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"); 615 goto bail4; 616 } 617 618 s->s_flags |= MS_NOATIME; 619 620 /* Fill superblock stuff */ 621 s->s_magic = HPFS_SUPER_MAGIC; 622 s->s_op = &hpfs_sops; 623 s->s_d_op = &hpfs_dentry_operations; 624 625 sbi->sb_root = le32_to_cpu(superblock->root); 626 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); 627 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); 628 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); 629 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); 630 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); 631 sbi->sb_uid = uid; 632 sbi->sb_gid = gid; 633 sbi->sb_mode = 0777 & ~umask; 634 sbi->sb_n_free = -1; 635 sbi->sb_n_free_dnodes = -1; 636 sbi->sb_lowercase = lowercase; 637 sbi->sb_eas = eas; 638 sbi->sb_chk = chk; 639 sbi->sb_chkdsk = chkdsk; 640 sbi->sb_err = errs; 641 sbi->sb_timeshift = timeshift; 642 sbi->sb_was_error = 0; 643 sbi->sb_cp_table = NULL; 644 sbi->sb_c_bitmap = -1; 645 sbi->sb_max_fwd_alloc = 0xffffff; 646 647 if (sbi->sb_fs_size >= 0x80000000) { 648 hpfs_error(s, "invalid size in superblock: %08x", 649 (unsigned)sbi->sb_fs_size); 650 goto bail4; 651 } 652 653 if (spareblock->n_spares_used) 654 hpfs_load_hotfix_map(s, spareblock); 655 656 /* Load bitmap directory */ 657 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) 658 goto bail4; 659 660 /* Check for general fs errors*/ 661 if (spareblock->dirty && !spareblock->old_wrote) { 662 if (errs == 2) { 663 pr_err("Improperly stopped, not mounted\n"); 664 goto bail4; 665 } 666 hpfs_error(s, "improperly stopped"); 667 } 668 669 if (!(s->s_flags & MS_RDONLY)) { 670 spareblock->dirty = 1; 671 spareblock->old_wrote = 0; 672 mark_buffer_dirty(bh2); 673 } 674 675 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { 676 if (errs >= 2) { 677 pr_err("Spare dnodes used, try chkdsk\n"); 678 mark_dirty(s, 0); 679 goto bail4; 680 } 681 hpfs_error(s, "warning: spare dnodes used, try chkdsk"); 682 if (errs == 0) 683 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); 684 } 685 if (chk) { 686 unsigned a; 687 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || 688 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { 689 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", 690 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); 691 goto bail4; 692 } 693 a = sbi->sb_dirband_size; 694 sbi->sb_dirband_size = 0; 695 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || 696 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || 697 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { 698 mark_dirty(s, 0); 699 goto bail4; 700 } 701 sbi->sb_dirband_size = a; 702 } else 703 pr_err("You really don't want any checks? You are crazy...\n"); 704 705 /* Load code page table */ 706 if (le32_to_cpu(spareblock->n_code_pages)) 707 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) 708 pr_err("code page support is disabled\n"); 709 710 brelse(bh2); 711 brelse(bh1); 712 brelse(bh0); 713 714 root = iget_locked(s, sbi->sb_root); 715 if (!root) 716 goto bail0; 717 hpfs_init_inode(root); 718 hpfs_read_inode(root); 719 unlock_new_inode(root); 720 s->s_root = d_make_root(root); 721 if (!s->s_root) 722 goto bail0; 723 724 /* 725 * find the root directory's . pointer & finish filling in the inode 726 */ 727 728 root_dno = hpfs_fnode_dno(s, sbi->sb_root); 729 if (root_dno) 730 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); 731 if (!de) 732 hpfs_error(s, "unable to find root dir"); 733 else { 734 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); 735 root->i_atime.tv_nsec = 0; 736 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); 737 root->i_mtime.tv_nsec = 0; 738 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); 739 root->i_ctime.tv_nsec = 0; 740 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); 741 hpfs_i(root)->i_parent_dir = root->i_ino; 742 if (root->i_size == -1) 743 root->i_size = 2048; 744 if (root->i_blocks == -1) 745 root->i_blocks = 5; 746 hpfs_brelse4(&qbh); 747 } 748 hpfs_unlock(s); 749 return 0; 750 751 bail4: brelse(bh2); 752 bail3: brelse(bh1); 753 bail2: brelse(bh0); 754 bail1: 755 bail0: 756 hpfs_unlock(s); 757 free_sbi(sbi); 758 return -EINVAL; 759 } 760 761 static struct dentry *hpfs_mount(struct file_system_type *fs_type, 762 int flags, const char *dev_name, void *data) 763 { 764 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); 765 } 766 767 static struct file_system_type hpfs_fs_type = { 768 .owner = THIS_MODULE, 769 .name = "hpfs", 770 .mount = hpfs_mount, 771 .kill_sb = kill_block_super, 772 .fs_flags = FS_REQUIRES_DEV, 773 }; 774 MODULE_ALIAS_FS("hpfs"); 775 776 static int __init init_hpfs_fs(void) 777 { 778 int err = init_inodecache(); 779 if (err) 780 goto out1; 781 err = register_filesystem(&hpfs_fs_type); 782 if (err) 783 goto out; 784 return 0; 785 out: 786 destroy_inodecache(); 787 out1: 788 return err; 789 } 790 791 static void __exit exit_hpfs_fs(void) 792 { 793 unregister_filesystem(&hpfs_fs_type); 794 destroy_inodecache(); 795 } 796 797 module_init(init_hpfs_fs) 798 module_exit(exit_hpfs_fs) 799 MODULE_LICENSE("GPL"); 800