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/fs_context.h> 13 #include <linux/fs_parser.h> 14 #include <linux/init.h> 15 #include <linux/statfs.h> 16 #include <linux/magic.h> 17 #include <linux/sched.h> 18 #include <linux/bitmap.h> 19 #include <linux/slab.h> 20 #include <linux/seq_file.h> 21 22 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ 23 24 static void mark_dirty(struct super_block *s, int remount) 25 { 26 if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) { 27 struct buffer_head *bh; 28 struct hpfs_spare_block *sb; 29 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 30 sb->dirty = 1; 31 sb->old_wrote = 0; 32 mark_buffer_dirty(bh); 33 sync_dirty_buffer(bh); 34 brelse(bh); 35 } 36 } 37 } 38 39 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there 40 were errors) */ 41 42 static void unmark_dirty(struct super_block *s) 43 { 44 struct buffer_head *bh; 45 struct hpfs_spare_block *sb; 46 if (sb_rdonly(s)) return; 47 sync_blockdev(s->s_bdev); 48 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 49 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error; 50 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error; 51 mark_buffer_dirty(bh); 52 sync_dirty_buffer(bh); 53 brelse(bh); 54 } 55 } 56 57 /* Filesystem error... */ 58 void hpfs_error(struct super_block *s, const char *fmt, ...) 59 { 60 struct va_format vaf; 61 va_list args; 62 63 va_start(args, fmt); 64 65 vaf.fmt = fmt; 66 vaf.va = &args; 67 68 pr_err("filesystem error: %pV", &vaf); 69 70 va_end(args); 71 72 if (!hpfs_sb(s)->sb_was_error) { 73 if (hpfs_sb(s)->sb_err == 2) { 74 pr_cont("; crashing the system because you wanted it\n"); 75 mark_dirty(s, 0); 76 panic("HPFS panic"); 77 } else if (hpfs_sb(s)->sb_err == 1) { 78 if (sb_rdonly(s)) 79 pr_cont("; already mounted read-only\n"); 80 else { 81 pr_cont("; remounting read-only\n"); 82 mark_dirty(s, 0); 83 s->s_flags |= SB_RDONLY; 84 } 85 } else if (sb_rdonly(s)) 86 pr_cont("; going on - but anything won't be destroyed because it's read-only\n"); 87 else 88 pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); 89 } else 90 pr_cont("\n"); 91 hpfs_sb(s)->sb_was_error = 1; 92 } 93 94 /* 95 * A little trick to detect cycles in many hpfs structures and don't let the 96 * kernel crash on corrupted filesystem. When first called, set c2 to 0. 97 * 98 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories 99 * nested each in other, chkdsk locked up happilly. 100 */ 101 102 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, 103 char *msg) 104 { 105 if (*c2 && *c1 == key) { 106 hpfs_error(s, "cycle detected on key %08x in %s", key, msg); 107 return 1; 108 } 109 (*c2)++; 110 if (!((*c2 - 1) & *c2)) *c1 = key; 111 return 0; 112 } 113 114 static void free_sbi(struct hpfs_sb_info *sbi) 115 { 116 kfree(sbi->sb_cp_table); 117 kfree(sbi->sb_bmp_dir); 118 kfree(sbi); 119 } 120 121 static void lazy_free_sbi(struct rcu_head *rcu) 122 { 123 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); 124 } 125 126 static void hpfs_put_super(struct super_block *s) 127 { 128 hpfs_lock(s); 129 unmark_dirty(s); 130 hpfs_unlock(s); 131 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); 132 } 133 134 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) 135 { 136 struct quad_buffer_head qbh; 137 unsigned long *bits; 138 unsigned count; 139 140 bits = hpfs_map_4sectors(s, secno, &qbh, 0); 141 if (!bits) 142 return (unsigned)-1; 143 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); 144 hpfs_brelse4(&qbh); 145 return count; 146 } 147 148 static unsigned count_bitmaps(struct super_block *s) 149 { 150 unsigned n, count, n_bands; 151 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; 152 count = 0; 153 for (n = 0; n < COUNT_RD_AHEAD; n++) { 154 hpfs_prefetch_bitmap(s, n); 155 } 156 for (n = 0; n < n_bands; n++) { 157 unsigned c; 158 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); 159 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); 160 if (c != (unsigned)-1) 161 count += c; 162 } 163 return count; 164 } 165 166 unsigned hpfs_get_free_dnodes(struct super_block *s) 167 { 168 struct hpfs_sb_info *sbi = hpfs_sb(s); 169 if (sbi->sb_n_free_dnodes == (unsigned)-1) { 170 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap); 171 if (c == (unsigned)-1) 172 return 0; 173 sbi->sb_n_free_dnodes = c; 174 } 175 return sbi->sb_n_free_dnodes; 176 } 177 178 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) 179 { 180 struct super_block *s = dentry->d_sb; 181 struct hpfs_sb_info *sbi = hpfs_sb(s); 182 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 183 184 hpfs_lock(s); 185 186 if (sbi->sb_n_free == (unsigned)-1) 187 sbi->sb_n_free = count_bitmaps(s); 188 189 buf->f_type = s->s_magic; 190 buf->f_bsize = 512; 191 buf->f_blocks = sbi->sb_fs_size; 192 buf->f_bfree = sbi->sb_n_free; 193 buf->f_bavail = sbi->sb_n_free; 194 buf->f_files = sbi->sb_dirband_size / 4; 195 buf->f_ffree = hpfs_get_free_dnodes(s); 196 buf->f_fsid = u64_to_fsid(id); 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 = alloc_inode_sb(sb, 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_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 enum { 277 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case, 278 Opt_check, Opt_err, Opt_eas, Opt_chkdsk, Opt_timeshift, 279 }; 280 281 static const struct constant_table hpfs_param_case[] = { 282 {"asis", 0}, 283 {"lower", 1}, 284 {} 285 }; 286 287 static const struct constant_table hpfs_param_check[] = { 288 {"none", 0}, 289 {"normal", 1}, 290 {"strict", 2}, 291 {} 292 }; 293 294 static const struct constant_table hpfs_param_err[] = { 295 {"continue", 0}, 296 {"remount-ro", 1}, 297 {"panic", 2}, 298 {} 299 }; 300 301 static const struct constant_table hpfs_param_eas[] = { 302 {"no", 0}, 303 {"ro", 1}, 304 {"rw", 2}, 305 {} 306 }; 307 308 static const struct constant_table hpfs_param_chkdsk[] = { 309 {"no", 0}, 310 {"errors", 1}, 311 {"always", 2}, 312 {} 313 }; 314 315 static const struct fs_parameter_spec hpfs_param_spec[] = { 316 fsparam_flag ("help", Opt_help), 317 fsparam_uid ("uid", Opt_uid), 318 fsparam_gid ("gid", Opt_gid), 319 fsparam_u32oct ("umask", Opt_umask), 320 fsparam_enum ("case", Opt_case, hpfs_param_case), 321 fsparam_enum ("check", Opt_check, hpfs_param_check), 322 fsparam_enum ("errors", Opt_err, hpfs_param_err), 323 fsparam_enum ("eas", Opt_eas, hpfs_param_eas), 324 fsparam_enum ("chkdsk", Opt_chkdsk, hpfs_param_chkdsk), 325 fsparam_s32 ("timeshift", Opt_timeshift), 326 {} 327 }; 328 329 struct hpfs_fc_context { 330 kuid_t uid; 331 kgid_t gid; 332 umode_t umask; 333 int lowercase; 334 int eas; 335 int chk; 336 int errs; 337 int chkdsk; 338 int timeshift; 339 }; 340 341 static inline void hpfs_help(void) 342 { 343 pr_info("\n\ 344 HPFS filesystem options:\n\ 345 help do not mount and display this text\n\ 346 uid=xxx set uid of files that don't have uid specified in eas\n\ 347 gid=xxx set gid of files that don't have gid specified in eas\n\ 348 umask=xxx set mode of files that don't have mode specified in eas\n\ 349 case=lower lowercase all files\n\ 350 case=asis do not lowercase files (default)\n\ 351 check=none no fs checks - kernel may crash on corrupted filesystem\n\ 352 check=normal do some checks - it should not crash (default)\n\ 353 check=strict do extra time-consuming checks, used for debugging\n\ 354 errors=continue continue on errors\n\ 355 errors=remount-ro remount read-only if errors found (default)\n\ 356 errors=panic panic on errors\n\ 357 chkdsk=no do not mark fs for chkdsking even if there were errors\n\ 358 chkdsk=errors mark fs dirty if errors found (default)\n\ 359 chkdsk=always always mark fs dirty - used for debugging\n\ 360 eas=no ignore extended attributes\n\ 361 eas=ro read but do not write extended attributes\n\ 362 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ 363 timeshift=nnn add nnn seconds to file times\n\ 364 \n"); 365 } 366 367 static int hpfs_parse_param(struct fs_context *fc, struct fs_parameter *param) 368 { 369 struct hpfs_fc_context *ctx = fc->fs_private; 370 struct fs_parse_result result; 371 int opt; 372 373 opt = fs_parse(fc, hpfs_param_spec, param, &result); 374 if (opt < 0) 375 return opt; 376 377 switch (opt) { 378 case Opt_help: 379 hpfs_help(); 380 return -EINVAL; 381 case Opt_uid: 382 ctx->uid = result.uid; 383 break; 384 case Opt_gid: 385 ctx->gid = result.gid; 386 break; 387 case Opt_umask: 388 ctx->umask = result.uint_32; 389 break; 390 case Opt_case: 391 ctx->lowercase = result.uint_32; 392 break; 393 case Opt_check: 394 ctx->chk = result.uint_32; 395 break; 396 case Opt_err: 397 ctx->errs = result.uint_32; 398 break; 399 case Opt_eas: 400 ctx->eas = result.uint_32; 401 break; 402 case Opt_chkdsk: 403 ctx->chkdsk = result.uint_32; 404 break; 405 case Opt_timeshift: 406 { 407 int m = 1; 408 char *rhs = param->string; 409 int timeshift; 410 411 if (*rhs == '-') m = -1; 412 if (*rhs == '+' || *rhs == '-') rhs++; 413 timeshift = simple_strtoul(rhs, &rhs, 0) * m; 414 if (*rhs) 415 return -EINVAL; 416 ctx->timeshift = timeshift; 417 break; 418 } 419 default: 420 return -EINVAL; 421 } 422 423 return 0; 424 } 425 426 static int hpfs_reconfigure(struct fs_context *fc) 427 { 428 struct hpfs_fc_context *ctx = fc->fs_private; 429 struct super_block *s = fc->root->d_sb; 430 struct hpfs_sb_info *sbi = hpfs_sb(s); 431 432 sync_filesystem(s); 433 434 fc->sb_flags |= SB_NOATIME; 435 436 hpfs_lock(s); 437 438 if (ctx->timeshift != sbi->sb_timeshift) { 439 pr_err("timeshift can't be changed using remount.\n"); 440 goto out_err; 441 } 442 443 unmark_dirty(s); 444 445 sbi->sb_uid = ctx->uid; sbi->sb_gid = ctx->gid; 446 sbi->sb_mode = 0777 & ~ctx->umask; 447 sbi->sb_lowercase = ctx->lowercase; 448 sbi->sb_eas = ctx->eas; sbi->sb_chk = ctx->chk; 449 sbi->sb_chkdsk = ctx->chkdsk; 450 sbi->sb_err = ctx->errs; sbi->sb_timeshift = ctx->timeshift; 451 452 if (!(fc->sb_flags & SB_RDONLY)) mark_dirty(s, 1); 453 454 hpfs_unlock(s); 455 return 0; 456 457 out_err: 458 hpfs_unlock(s); 459 return -EINVAL; 460 } 461 462 static int hpfs_show_options(struct seq_file *seq, struct dentry *root) 463 { 464 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb); 465 466 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid)); 467 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid)); 468 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777)); 469 if (sbi->sb_lowercase) 470 seq_printf(seq, ",case=lower"); 471 if (!sbi->sb_chk) 472 seq_printf(seq, ",check=none"); 473 if (sbi->sb_chk == 2) 474 seq_printf(seq, ",check=strict"); 475 if (!sbi->sb_err) 476 seq_printf(seq, ",errors=continue"); 477 if (sbi->sb_err == 2) 478 seq_printf(seq, ",errors=panic"); 479 if (!sbi->sb_chkdsk) 480 seq_printf(seq, ",chkdsk=no"); 481 if (sbi->sb_chkdsk == 2) 482 seq_printf(seq, ",chkdsk=always"); 483 if (!sbi->sb_eas) 484 seq_printf(seq, ",eas=no"); 485 if (sbi->sb_eas == 1) 486 seq_printf(seq, ",eas=ro"); 487 if (sbi->sb_timeshift) 488 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift); 489 return 0; 490 } 491 492 /* Super operations */ 493 494 static const struct super_operations hpfs_sops = 495 { 496 .alloc_inode = hpfs_alloc_inode, 497 .free_inode = hpfs_free_inode, 498 .evict_inode = hpfs_evict_inode, 499 .put_super = hpfs_put_super, 500 .statfs = hpfs_statfs, 501 .show_options = hpfs_show_options, 502 }; 503 504 static int hpfs_fill_super(struct super_block *s, struct fs_context *fc) 505 { 506 struct hpfs_fc_context *ctx = fc->fs_private; 507 struct buffer_head *bh0, *bh1, *bh2; 508 struct hpfs_boot_block *bootblock; 509 struct hpfs_super_block *superblock; 510 struct hpfs_spare_block *spareblock; 511 struct hpfs_sb_info *sbi; 512 struct inode *root; 513 int silent = fc->sb_flags & SB_SILENT; 514 515 dnode_secno root_dno; 516 struct hpfs_dirent *de = NULL; 517 struct quad_buffer_head qbh; 518 519 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 520 if (!sbi) { 521 return -ENOMEM; 522 } 523 s->s_fs_info = sbi; 524 525 mutex_init(&sbi->hpfs_mutex); 526 hpfs_lock(s); 527 528 /*sbi->sb_mounting = 1;*/ 529 sb_set_blocksize(s, 512); 530 sbi->sb_fs_size = -1; 531 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; 532 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; 533 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; 534 535 /* Check magics */ 536 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC 537 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC 538 || le32_to_cpu(spareblock->magic) != SP_MAGIC) { 539 if (!silent) 540 pr_err("Bad magic ... probably not HPFS\n"); 541 goto bail4; 542 } 543 544 /* Check version */ 545 if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) { 546 pr_err("Bad version %d,%d. Mount readonly to go around\n", 547 (int)superblock->version, (int)superblock->funcversion); 548 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"); 549 goto bail4; 550 } 551 552 s->s_flags |= SB_NOATIME; 553 554 /* Fill superblock stuff */ 555 s->s_magic = HPFS_SUPER_MAGIC; 556 s->s_op = &hpfs_sops; 557 s->s_d_op = &hpfs_dentry_operations; 558 s->s_time_min = local_to_gmt(s, 0); 559 s->s_time_max = local_to_gmt(s, U32_MAX); 560 561 sbi->sb_root = le32_to_cpu(superblock->root); 562 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); 563 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); 564 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); 565 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); 566 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); 567 sbi->sb_uid = ctx->uid; 568 sbi->sb_gid = ctx->gid; 569 sbi->sb_mode = 0777 & ~ctx->umask; 570 sbi->sb_n_free = -1; 571 sbi->sb_n_free_dnodes = -1; 572 sbi->sb_lowercase = ctx->lowercase; 573 sbi->sb_eas = ctx->eas; 574 sbi->sb_chk = ctx->chk; 575 sbi->sb_chkdsk = ctx->chkdsk; 576 sbi->sb_err = ctx->errs; 577 sbi->sb_timeshift = ctx->timeshift; 578 sbi->sb_was_error = 0; 579 sbi->sb_cp_table = NULL; 580 sbi->sb_c_bitmap = -1; 581 sbi->sb_max_fwd_alloc = 0xffffff; 582 583 if (sbi->sb_fs_size >= 0x80000000) { 584 hpfs_error(s, "invalid size in superblock: %08x", 585 (unsigned)sbi->sb_fs_size); 586 goto bail4; 587 } 588 589 if (spareblock->n_spares_used) 590 hpfs_load_hotfix_map(s, spareblock); 591 592 /* Load bitmap directory */ 593 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) 594 goto bail4; 595 596 /* Check for general fs errors*/ 597 if (spareblock->dirty && !spareblock->old_wrote) { 598 if (sbi->sb_err == 2) { 599 pr_err("Improperly stopped, not mounted\n"); 600 goto bail4; 601 } 602 hpfs_error(s, "improperly stopped"); 603 } 604 605 if (!sb_rdonly(s)) { 606 spareblock->dirty = 1; 607 spareblock->old_wrote = 0; 608 mark_buffer_dirty(bh2); 609 } 610 611 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { 612 if (sbi->sb_err >= 2) { 613 pr_err("Spare dnodes used, try chkdsk\n"); 614 mark_dirty(s, 0); 615 goto bail4; 616 } 617 hpfs_error(s, "warning: spare dnodes used, try chkdsk"); 618 if (sbi->sb_err == 0) 619 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); 620 } 621 if (sbi->sb_chk) { 622 unsigned a; 623 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || 624 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { 625 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", 626 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); 627 goto bail4; 628 } 629 a = sbi->sb_dirband_size; 630 sbi->sb_dirband_size = 0; 631 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || 632 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || 633 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { 634 mark_dirty(s, 0); 635 goto bail4; 636 } 637 sbi->sb_dirband_size = a; 638 } else 639 pr_err("You really don't want any checks? You are crazy...\n"); 640 641 /* Load code page table */ 642 if (le32_to_cpu(spareblock->n_code_pages)) 643 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) 644 pr_err("code page support is disabled\n"); 645 646 brelse(bh2); 647 brelse(bh1); 648 brelse(bh0); 649 650 root = iget_locked(s, sbi->sb_root); 651 if (!root) 652 goto bail0; 653 hpfs_init_inode(root); 654 hpfs_read_inode(root); 655 unlock_new_inode(root); 656 s->s_root = d_make_root(root); 657 if (!s->s_root) 658 goto bail0; 659 660 /* 661 * find the root directory's . pointer & finish filling in the inode 662 */ 663 664 root_dno = hpfs_fnode_dno(s, sbi->sb_root); 665 if (root_dno) 666 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); 667 if (!de) 668 hpfs_error(s, "unable to find root dir"); 669 else { 670 inode_set_atime(root, 671 local_to_gmt(s, le32_to_cpu(de->read_date)), 672 0); 673 inode_set_mtime(root, 674 local_to_gmt(s, le32_to_cpu(de->write_date)), 675 0); 676 inode_set_ctime(root, 677 local_to_gmt(s, le32_to_cpu(de->creation_date)), 678 0); 679 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); 680 hpfs_i(root)->i_parent_dir = root->i_ino; 681 if (root->i_size == -1) 682 root->i_size = 2048; 683 if (root->i_blocks == -1) 684 root->i_blocks = 5; 685 hpfs_brelse4(&qbh); 686 } 687 hpfs_unlock(s); 688 return 0; 689 690 bail4: brelse(bh2); 691 bail3: brelse(bh1); 692 bail2: brelse(bh0); 693 bail1: 694 bail0: 695 hpfs_unlock(s); 696 free_sbi(sbi); 697 return -EINVAL; 698 } 699 700 static int hpfs_get_tree(struct fs_context *fc) 701 { 702 return get_tree_bdev(fc, hpfs_fill_super); 703 } 704 705 static void hpfs_free_fc(struct fs_context *fc) 706 { 707 kfree(fc->fs_private); 708 } 709 710 static const struct fs_context_operations hpfs_fc_context_ops = { 711 .parse_param = hpfs_parse_param, 712 .get_tree = hpfs_get_tree, 713 .reconfigure = hpfs_reconfigure, 714 .free = hpfs_free_fc, 715 }; 716 717 static int hpfs_init_fs_context(struct fs_context *fc) 718 { 719 struct hpfs_fc_context *ctx; 720 721 ctx = kzalloc(sizeof(struct hpfs_fc_context), GFP_KERNEL); 722 if (!ctx) 723 return -ENOMEM; 724 725 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 726 struct super_block *sb = fc->root->d_sb; 727 struct hpfs_sb_info *sbi = hpfs_sb(sb); 728 729 ctx->uid = sbi->sb_uid; 730 ctx->gid = sbi->sb_gid; 731 ctx->umask = 0777 & ~sbi->sb_mode; 732 ctx->lowercase = sbi->sb_lowercase; 733 ctx->eas = sbi->sb_eas; 734 ctx->chk = sbi->sb_chk; 735 ctx->chkdsk = sbi->sb_chkdsk; 736 ctx->errs = sbi->sb_err; 737 ctx->timeshift = sbi->sb_timeshift; 738 739 } else { 740 ctx->uid = current_uid(); 741 ctx->gid = current_gid(); 742 ctx->umask = current_umask(); 743 ctx->lowercase = 0; 744 ctx->eas = 2; 745 ctx->chk = 1; 746 ctx->errs = 1; 747 ctx->chkdsk = 1; 748 ctx->timeshift = 0; 749 } 750 751 fc->fs_private = ctx; 752 fc->ops = &hpfs_fc_context_ops; 753 754 return 0; 755 }; 756 757 static struct file_system_type hpfs_fs_type = { 758 .owner = THIS_MODULE, 759 .name = "hpfs", 760 .kill_sb = kill_block_super, 761 .fs_flags = FS_REQUIRES_DEV, 762 .init_fs_context = hpfs_init_fs_context, 763 .parameters = hpfs_param_spec, 764 }; 765 MODULE_ALIAS_FS("hpfs"); 766 767 static int __init init_hpfs_fs(void) 768 { 769 int err = init_inodecache(); 770 if (err) 771 goto out1; 772 err = register_filesystem(&hpfs_fs_type); 773 if (err) 774 goto out; 775 return 0; 776 out: 777 destroy_inodecache(); 778 out1: 779 return err; 780 } 781 782 static void __exit exit_hpfs_fs(void) 783 { 784 unregister_filesystem(&hpfs_fs_type); 785 destroy_inodecache(); 786 } 787 788 module_init(init_hpfs_fs) 789 module_exit(exit_hpfs_fs) 790 MODULE_DESCRIPTION("OS/2 HPFS file system support"); 791 MODULE_LICENSE("GPL"); 792