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 static char err_buf[1024]; 56 57 void hpfs_error(struct super_block *s, const char *fmt, ...) 58 { 59 va_list args; 60 61 va_start(args, fmt); 62 vsnprintf(err_buf, sizeof(err_buf), fmt, args); 63 va_end(args); 64 65 printk("HPFS: filesystem error: %s", err_buf); 66 if (!hpfs_sb(s)->sb_was_error) { 67 if (hpfs_sb(s)->sb_err == 2) { 68 printk("; crashing the system because you wanted it\n"); 69 mark_dirty(s, 0); 70 panic("HPFS panic"); 71 } else if (hpfs_sb(s)->sb_err == 1) { 72 if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n"); 73 else { 74 printk("; remounting read-only\n"); 75 mark_dirty(s, 0); 76 s->s_flags |= MS_RDONLY; 77 } 78 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n"); 79 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); 80 } else printk("\n"); 81 hpfs_sb(s)->sb_was_error = 1; 82 } 83 84 /* 85 * A little trick to detect cycles in many hpfs structures and don't let the 86 * kernel crash on corrupted filesystem. When first called, set c2 to 0. 87 * 88 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories 89 * nested each in other, chkdsk locked up happilly. 90 */ 91 92 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, 93 char *msg) 94 { 95 if (*c2 && *c1 == key) { 96 hpfs_error(s, "cycle detected on key %08x in %s", key, msg); 97 return 1; 98 } 99 (*c2)++; 100 if (!((*c2 - 1) & *c2)) *c1 = key; 101 return 0; 102 } 103 104 static void free_sbi(struct hpfs_sb_info *sbi) 105 { 106 kfree(sbi->sb_cp_table); 107 kfree(sbi->sb_bmp_dir); 108 kfree(sbi); 109 } 110 111 static void lazy_free_sbi(struct rcu_head *rcu) 112 { 113 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); 114 } 115 116 static void hpfs_put_super(struct super_block *s) 117 { 118 hpfs_lock(s); 119 unmark_dirty(s); 120 hpfs_unlock(s); 121 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); 122 } 123 124 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) 125 { 126 struct quad_buffer_head qbh; 127 unsigned long *bits; 128 unsigned count; 129 130 bits = hpfs_map_4sectors(s, secno, &qbh, 0); 131 if (!bits) 132 return 0; 133 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); 134 hpfs_brelse4(&qbh); 135 return count; 136 } 137 138 static unsigned count_bitmaps(struct super_block *s) 139 { 140 unsigned n, count, n_bands; 141 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; 142 count = 0; 143 for (n = 0; n < COUNT_RD_AHEAD; n++) { 144 hpfs_prefetch_bitmap(s, n); 145 } 146 for (n = 0; n < n_bands; n++) { 147 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); 148 count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); 149 } 150 return count; 151 } 152 153 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) 154 { 155 struct super_block *s = dentry->d_sb; 156 struct hpfs_sb_info *sbi = hpfs_sb(s); 157 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 158 hpfs_lock(s); 159 160 /*if (sbi->sb_n_free == -1) {*/ 161 sbi->sb_n_free = count_bitmaps(s); 162 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap); 163 /*}*/ 164 buf->f_type = s->s_magic; 165 buf->f_bsize = 512; 166 buf->f_blocks = sbi->sb_fs_size; 167 buf->f_bfree = sbi->sb_n_free; 168 buf->f_bavail = sbi->sb_n_free; 169 buf->f_files = sbi->sb_dirband_size / 4; 170 buf->f_ffree = sbi->sb_n_free_dnodes; 171 buf->f_fsid.val[0] = (u32)id; 172 buf->f_fsid.val[1] = (u32)(id >> 32); 173 buf->f_namelen = 254; 174 175 hpfs_unlock(s); 176 177 return 0; 178 } 179 180 static struct kmem_cache * hpfs_inode_cachep; 181 182 static struct inode *hpfs_alloc_inode(struct super_block *sb) 183 { 184 struct hpfs_inode_info *ei; 185 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); 186 if (!ei) 187 return NULL; 188 ei->vfs_inode.i_version = 1; 189 return &ei->vfs_inode; 190 } 191 192 static void hpfs_i_callback(struct rcu_head *head) 193 { 194 struct inode *inode = container_of(head, struct inode, i_rcu); 195 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); 196 } 197 198 static void hpfs_destroy_inode(struct inode *inode) 199 { 200 call_rcu(&inode->i_rcu, hpfs_i_callback); 201 } 202 203 static void init_once(void *foo) 204 { 205 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; 206 207 inode_init_once(&ei->vfs_inode); 208 } 209 210 static int init_inodecache(void) 211 { 212 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", 213 sizeof(struct hpfs_inode_info), 214 0, (SLAB_RECLAIM_ACCOUNT| 215 SLAB_MEM_SPREAD), 216 init_once); 217 if (hpfs_inode_cachep == NULL) 218 return -ENOMEM; 219 return 0; 220 } 221 222 static void destroy_inodecache(void) 223 { 224 /* 225 * Make sure all delayed rcu free inodes are flushed before we 226 * destroy cache. 227 */ 228 rcu_barrier(); 229 kmem_cache_destroy(hpfs_inode_cachep); 230 } 231 232 /* 233 * A tiny parser for option strings, stolen from dosfs. 234 * Stolen again from read-only hpfs. 235 * And updated for table-driven option parsing. 236 */ 237 238 enum { 239 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, 240 Opt_check_none, Opt_check_normal, Opt_check_strict, 241 Opt_err_cont, Opt_err_ro, Opt_err_panic, 242 Opt_eas_no, Opt_eas_ro, Opt_eas_rw, 243 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, 244 Opt_timeshift, Opt_err, 245 }; 246 247 static const match_table_t tokens = { 248 {Opt_help, "help"}, 249 {Opt_uid, "uid=%u"}, 250 {Opt_gid, "gid=%u"}, 251 {Opt_umask, "umask=%o"}, 252 {Opt_case_lower, "case=lower"}, 253 {Opt_case_asis, "case=asis"}, 254 {Opt_check_none, "check=none"}, 255 {Opt_check_normal, "check=normal"}, 256 {Opt_check_strict, "check=strict"}, 257 {Opt_err_cont, "errors=continue"}, 258 {Opt_err_ro, "errors=remount-ro"}, 259 {Opt_err_panic, "errors=panic"}, 260 {Opt_eas_no, "eas=no"}, 261 {Opt_eas_ro, "eas=ro"}, 262 {Opt_eas_rw, "eas=rw"}, 263 {Opt_chkdsk_no, "chkdsk=no"}, 264 {Opt_chkdsk_errors, "chkdsk=errors"}, 265 {Opt_chkdsk_always, "chkdsk=always"}, 266 {Opt_timeshift, "timeshift=%d"}, 267 {Opt_err, NULL}, 268 }; 269 270 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, 271 int *lowercase, int *eas, int *chk, int *errs, 272 int *chkdsk, int *timeshift) 273 { 274 char *p; 275 int option; 276 277 if (!opts) 278 return 1; 279 280 /*printk("Parsing opts: '%s'\n",opts);*/ 281 282 while ((p = strsep(&opts, ",")) != NULL) { 283 substring_t args[MAX_OPT_ARGS]; 284 int token; 285 if (!*p) 286 continue; 287 288 token = match_token(p, tokens, args); 289 switch (token) { 290 case Opt_help: 291 return 2; 292 case Opt_uid: 293 if (match_int(args, &option)) 294 return 0; 295 *uid = make_kuid(current_user_ns(), option); 296 if (!uid_valid(*uid)) 297 return 0; 298 break; 299 case Opt_gid: 300 if (match_int(args, &option)) 301 return 0; 302 *gid = make_kgid(current_user_ns(), option); 303 if (!gid_valid(*gid)) 304 return 0; 305 break; 306 case Opt_umask: 307 if (match_octal(args, &option)) 308 return 0; 309 *umask = option; 310 break; 311 case Opt_case_lower: 312 *lowercase = 1; 313 break; 314 case Opt_case_asis: 315 *lowercase = 0; 316 break; 317 case Opt_check_none: 318 *chk = 0; 319 break; 320 case Opt_check_normal: 321 *chk = 1; 322 break; 323 case Opt_check_strict: 324 *chk = 2; 325 break; 326 case Opt_err_cont: 327 *errs = 0; 328 break; 329 case Opt_err_ro: 330 *errs = 1; 331 break; 332 case Opt_err_panic: 333 *errs = 2; 334 break; 335 case Opt_eas_no: 336 *eas = 0; 337 break; 338 case Opt_eas_ro: 339 *eas = 1; 340 break; 341 case Opt_eas_rw: 342 *eas = 2; 343 break; 344 case Opt_chkdsk_no: 345 *chkdsk = 0; 346 break; 347 case Opt_chkdsk_errors: 348 *chkdsk = 1; 349 break; 350 case Opt_chkdsk_always: 351 *chkdsk = 2; 352 break; 353 case Opt_timeshift: 354 { 355 int m = 1; 356 char *rhs = args[0].from; 357 if (!rhs || !*rhs) 358 return 0; 359 if (*rhs == '-') m = -1; 360 if (*rhs == '+' || *rhs == '-') rhs++; 361 *timeshift = simple_strtoul(rhs, &rhs, 0) * m; 362 if (*rhs) 363 return 0; 364 break; 365 } 366 default: 367 return 0; 368 } 369 } 370 return 1; 371 } 372 373 static inline void hpfs_help(void) 374 { 375 printk("\n\ 376 HPFS filesystem options:\n\ 377 help do not mount and display this text\n\ 378 uid=xxx set uid of files that don't have uid specified in eas\n\ 379 gid=xxx set gid of files that don't have gid specified in eas\n\ 380 umask=xxx set mode of files that don't have mode specified in eas\n\ 381 case=lower lowercase all files\n\ 382 case=asis do not lowercase files (default)\n\ 383 check=none no fs checks - kernel may crash on corrupted filesystem\n\ 384 check=normal do some checks - it should not crash (default)\n\ 385 check=strict do extra time-consuming checks, used for debugging\n\ 386 errors=continue continue on errors\n\ 387 errors=remount-ro remount read-only if errors found (default)\n\ 388 errors=panic panic on errors\n\ 389 chkdsk=no do not mark fs for chkdsking even if there were errors\n\ 390 chkdsk=errors mark fs dirty if errors found (default)\n\ 391 chkdsk=always always mark fs dirty - used for debugging\n\ 392 eas=no ignore extended attributes\n\ 393 eas=ro read but do not write extended attributes\n\ 394 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ 395 timeshift=nnn add nnn seconds to file times\n\ 396 \n"); 397 } 398 399 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) 400 { 401 kuid_t uid; 402 kgid_t gid; 403 umode_t umask; 404 int lowercase, eas, chk, errs, chkdsk, timeshift; 405 int o; 406 struct hpfs_sb_info *sbi = hpfs_sb(s); 407 char *new_opts = kstrdup(data, GFP_KERNEL); 408 409 *flags |= MS_NOATIME; 410 411 hpfs_lock(s); 412 uid = sbi->sb_uid; gid = sbi->sb_gid; 413 umask = 0777 & ~sbi->sb_mode; 414 lowercase = sbi->sb_lowercase; 415 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; 416 errs = sbi->sb_err; timeshift = sbi->sb_timeshift; 417 418 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, 419 &eas, &chk, &errs, &chkdsk, ×hift))) { 420 printk("HPFS: bad mount options.\n"); 421 goto out_err; 422 } 423 if (o == 2) { 424 hpfs_help(); 425 goto out_err; 426 } 427 if (timeshift != sbi->sb_timeshift) { 428 printk("HPFS: timeshift can't be changed using remount.\n"); 429 goto out_err; 430 } 431 432 unmark_dirty(s); 433 434 sbi->sb_uid = uid; sbi->sb_gid = gid; 435 sbi->sb_mode = 0777 & ~umask; 436 sbi->sb_lowercase = lowercase; 437 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; 438 sbi->sb_err = errs; sbi->sb_timeshift = timeshift; 439 440 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); 441 442 replace_mount_options(s, new_opts); 443 444 hpfs_unlock(s); 445 return 0; 446 447 out_err: 448 hpfs_unlock(s); 449 kfree(new_opts); 450 return -EINVAL; 451 } 452 453 /* Super operations */ 454 455 static const struct super_operations hpfs_sops = 456 { 457 .alloc_inode = hpfs_alloc_inode, 458 .destroy_inode = hpfs_destroy_inode, 459 .evict_inode = hpfs_evict_inode, 460 .put_super = hpfs_put_super, 461 .statfs = hpfs_statfs, 462 .remount_fs = hpfs_remount_fs, 463 .show_options = generic_show_options, 464 }; 465 466 static int hpfs_fill_super(struct super_block *s, void *options, int silent) 467 { 468 struct buffer_head *bh0, *bh1, *bh2; 469 struct hpfs_boot_block *bootblock; 470 struct hpfs_super_block *superblock; 471 struct hpfs_spare_block *spareblock; 472 struct hpfs_sb_info *sbi; 473 struct inode *root; 474 475 kuid_t uid; 476 kgid_t gid; 477 umode_t umask; 478 int lowercase, eas, chk, errs, chkdsk, timeshift; 479 480 dnode_secno root_dno; 481 struct hpfs_dirent *de = NULL; 482 struct quad_buffer_head qbh; 483 484 int o; 485 486 save_mount_options(s, options); 487 488 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 489 if (!sbi) { 490 return -ENOMEM; 491 } 492 s->s_fs_info = sbi; 493 494 mutex_init(&sbi->hpfs_mutex); 495 hpfs_lock(s); 496 497 uid = current_uid(); 498 gid = current_gid(); 499 umask = current_umask(); 500 lowercase = 0; 501 eas = 2; 502 chk = 1; 503 errs = 1; 504 chkdsk = 1; 505 timeshift = 0; 506 507 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, 508 &eas, &chk, &errs, &chkdsk, ×hift))) { 509 printk("HPFS: bad mount options.\n"); 510 goto bail0; 511 } 512 if (o==2) { 513 hpfs_help(); 514 goto bail0; 515 } 516 517 /*sbi->sb_mounting = 1;*/ 518 sb_set_blocksize(s, 512); 519 sbi->sb_fs_size = -1; 520 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; 521 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; 522 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; 523 524 /* Check magics */ 525 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC 526 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC 527 || le32_to_cpu(spareblock->magic) != SP_MAGIC) { 528 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n"); 529 goto bail4; 530 } 531 532 /* Check version */ 533 if (!(s->s_flags & MS_RDONLY) && 534 superblock->funcversion != 2 && superblock->funcversion != 3) { 535 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n", 536 (int)superblock->version, (int)superblock->funcversion); 537 printk("HPFS: 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"); 538 goto bail4; 539 } 540 541 s->s_flags |= MS_NOATIME; 542 543 /* Fill superblock stuff */ 544 s->s_magic = HPFS_SUPER_MAGIC; 545 s->s_op = &hpfs_sops; 546 s->s_d_op = &hpfs_dentry_operations; 547 548 sbi->sb_root = le32_to_cpu(superblock->root); 549 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); 550 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); 551 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); 552 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); 553 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); 554 sbi->sb_uid = uid; 555 sbi->sb_gid = gid; 556 sbi->sb_mode = 0777 & ~umask; 557 sbi->sb_n_free = -1; 558 sbi->sb_n_free_dnodes = -1; 559 sbi->sb_lowercase = lowercase; 560 sbi->sb_eas = eas; 561 sbi->sb_chk = chk; 562 sbi->sb_chkdsk = chkdsk; 563 sbi->sb_err = errs; 564 sbi->sb_timeshift = timeshift; 565 sbi->sb_was_error = 0; 566 sbi->sb_cp_table = NULL; 567 sbi->sb_c_bitmap = -1; 568 sbi->sb_max_fwd_alloc = 0xffffff; 569 570 if (sbi->sb_fs_size >= 0x80000000) { 571 hpfs_error(s, "invalid size in superblock: %08x", 572 (unsigned)sbi->sb_fs_size); 573 goto bail4; 574 } 575 576 /* Load bitmap directory */ 577 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) 578 goto bail4; 579 580 /* Check for general fs errors*/ 581 if (spareblock->dirty && !spareblock->old_wrote) { 582 if (errs == 2) { 583 printk("HPFS: Improperly stopped, not mounted\n"); 584 goto bail4; 585 } 586 hpfs_error(s, "improperly stopped"); 587 } 588 589 if (!(s->s_flags & MS_RDONLY)) { 590 spareblock->dirty = 1; 591 spareblock->old_wrote = 0; 592 mark_buffer_dirty(bh2); 593 } 594 595 if (spareblock->hotfixes_used || spareblock->n_spares_used) { 596 if (errs >= 2) { 597 printk("HPFS: Hotfixes not supported here, try chkdsk\n"); 598 mark_dirty(s, 0); 599 goto bail4; 600 } 601 hpfs_error(s, "hotfixes not supported here, try chkdsk"); 602 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n"); 603 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n"); 604 } 605 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { 606 if (errs >= 2) { 607 printk("HPFS: Spare dnodes used, try chkdsk\n"); 608 mark_dirty(s, 0); 609 goto bail4; 610 } 611 hpfs_error(s, "warning: spare dnodes used, try chkdsk"); 612 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); 613 } 614 if (chk) { 615 unsigned a; 616 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || 617 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { 618 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", 619 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); 620 goto bail4; 621 } 622 a = sbi->sb_dirband_size; 623 sbi->sb_dirband_size = 0; 624 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || 625 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || 626 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { 627 mark_dirty(s, 0); 628 goto bail4; 629 } 630 sbi->sb_dirband_size = a; 631 } else printk("HPFS: You really don't want any checks? You are crazy...\n"); 632 633 /* Load code page table */ 634 if (le32_to_cpu(spareblock->n_code_pages)) 635 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) 636 printk("HPFS: Warning: code page support is disabled\n"); 637 638 brelse(bh2); 639 brelse(bh1); 640 brelse(bh0); 641 642 root = iget_locked(s, sbi->sb_root); 643 if (!root) 644 goto bail0; 645 hpfs_init_inode(root); 646 hpfs_read_inode(root); 647 unlock_new_inode(root); 648 s->s_root = d_make_root(root); 649 if (!s->s_root) 650 goto bail0; 651 652 /* 653 * find the root directory's . pointer & finish filling in the inode 654 */ 655 656 root_dno = hpfs_fnode_dno(s, sbi->sb_root); 657 if (root_dno) 658 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); 659 if (!de) 660 hpfs_error(s, "unable to find root dir"); 661 else { 662 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); 663 root->i_atime.tv_nsec = 0; 664 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); 665 root->i_mtime.tv_nsec = 0; 666 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); 667 root->i_ctime.tv_nsec = 0; 668 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); 669 hpfs_i(root)->i_parent_dir = root->i_ino; 670 if (root->i_size == -1) 671 root->i_size = 2048; 672 if (root->i_blocks == -1) 673 root->i_blocks = 5; 674 hpfs_brelse4(&qbh); 675 } 676 hpfs_unlock(s); 677 return 0; 678 679 bail4: brelse(bh2); 680 bail3: brelse(bh1); 681 bail2: brelse(bh0); 682 bail1: 683 bail0: 684 hpfs_unlock(s); 685 free_sbi(sbi); 686 return -EINVAL; 687 } 688 689 static struct dentry *hpfs_mount(struct file_system_type *fs_type, 690 int flags, const char *dev_name, void *data) 691 { 692 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); 693 } 694 695 static struct file_system_type hpfs_fs_type = { 696 .owner = THIS_MODULE, 697 .name = "hpfs", 698 .mount = hpfs_mount, 699 .kill_sb = kill_block_super, 700 .fs_flags = FS_REQUIRES_DEV, 701 }; 702 MODULE_ALIAS_FS("hpfs"); 703 704 static int __init init_hpfs_fs(void) 705 { 706 int err = init_inodecache(); 707 if (err) 708 goto out1; 709 err = register_filesystem(&hpfs_fs_type); 710 if (err) 711 goto out; 712 return 0; 713 out: 714 destroy_inodecache(); 715 out1: 716 return err; 717 } 718 719 static void __exit exit_hpfs_fs(void) 720 { 721 unregister_filesystem(&hpfs_fs_type); 722 destroy_inodecache(); 723 } 724 725 module_init(init_hpfs_fs) 726 module_exit(exit_hpfs_fs) 727 MODULE_LICENSE("GPL"); 728