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_struct.h> 13 #include <linux/fs_context.h> 14 #include <linux/fs_parser.h> 15 #include <linux/init.h> 16 #include <linux/statfs.h> 17 #include <linux/magic.h> 18 #include <linux/sched.h> 19 #include <linux/bitmap.h> 20 #include <linux/slab.h> 21 #include <linux/seq_file.h> 22 23 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ 24 25 static void mark_dirty(struct super_block *s, int remount) 26 { 27 if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) { 28 struct buffer_head *bh; 29 struct hpfs_spare_block *sb; 30 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 31 sb->dirty = 1; 32 sb->old_wrote = 0; 33 mark_buffer_dirty(bh); 34 sync_dirty_buffer(bh); 35 brelse(bh); 36 } 37 } 38 } 39 40 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there 41 were errors) */ 42 43 static void unmark_dirty(struct super_block *s) 44 { 45 struct buffer_head *bh; 46 struct hpfs_spare_block *sb; 47 if (sb_rdonly(s)) return; 48 sync_blockdev(s->s_bdev); 49 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { 50 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error; 51 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error; 52 mark_buffer_dirty(bh); 53 sync_dirty_buffer(bh); 54 brelse(bh); 55 } 56 } 57 58 /* Filesystem error... */ 59 void hpfs_error(struct super_block *s, const char *fmt, ...) 60 { 61 struct va_format vaf; 62 va_list args; 63 64 va_start(args, fmt); 65 66 vaf.fmt = fmt; 67 vaf.va = &args; 68 69 pr_err("filesystem error: %pV", &vaf); 70 71 va_end(args); 72 73 if (!hpfs_sb(s)->sb_was_error) { 74 if (hpfs_sb(s)->sb_err == 2) { 75 pr_cont("; crashing the system because you wanted it\n"); 76 mark_dirty(s, 0); 77 panic("HPFS panic"); 78 } else if (hpfs_sb(s)->sb_err == 1) { 79 if (sb_rdonly(s)) 80 pr_cont("; already mounted read-only\n"); 81 else { 82 pr_cont("; remounting read-only\n"); 83 mark_dirty(s, 0); 84 s->s_flags |= SB_RDONLY; 85 } 86 } else if (sb_rdonly(s)) 87 pr_cont("; going on - but anything won't be destroyed because it's read-only\n"); 88 else 89 pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); 90 } else 91 pr_cont("\n"); 92 hpfs_sb(s)->sb_was_error = 1; 93 } 94 95 /* 96 * A little trick to detect cycles in many hpfs structures and don't let the 97 * kernel crash on corrupted filesystem. When first called, set c2 to 0. 98 * 99 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories 100 * nested each in other, chkdsk locked up happilly. 101 */ 102 103 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, 104 char *msg) 105 { 106 if (*c2 && *c1 == key) { 107 hpfs_error(s, "cycle detected on key %08x in %s", key, msg); 108 return 1; 109 } 110 (*c2)++; 111 if (!((*c2 - 1) & *c2)) *c1 = key; 112 return 0; 113 } 114 115 static void free_sbi(struct hpfs_sb_info *sbi) 116 { 117 kfree(sbi->sb_cp_table); 118 kfree(sbi->sb_bmp_dir); 119 kfree(sbi); 120 } 121 122 static void lazy_free_sbi(struct rcu_head *rcu) 123 { 124 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); 125 } 126 127 static void hpfs_put_super(struct super_block *s) 128 { 129 hpfs_lock(s); 130 unmark_dirty(s); 131 hpfs_unlock(s); 132 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); 133 } 134 135 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) 136 { 137 struct quad_buffer_head qbh; 138 unsigned long *bits; 139 unsigned count; 140 141 bits = hpfs_map_4sectors(s, secno, &qbh, 0); 142 if (!bits) 143 return (unsigned)-1; 144 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); 145 hpfs_brelse4(&qbh); 146 return count; 147 } 148 149 static unsigned count_bitmaps(struct super_block *s) 150 { 151 unsigned n, count, n_bands; 152 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; 153 count = 0; 154 for (n = 0; n < COUNT_RD_AHEAD; n++) { 155 hpfs_prefetch_bitmap(s, n); 156 } 157 for (n = 0; n < n_bands; n++) { 158 unsigned c; 159 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); 160 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); 161 if (c != (unsigned)-1) 162 count += c; 163 } 164 return count; 165 } 166 167 unsigned hpfs_get_free_dnodes(struct super_block *s) 168 { 169 struct hpfs_sb_info *sbi = hpfs_sb(s); 170 if (sbi->sb_n_free_dnodes == (unsigned)-1) { 171 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap); 172 if (c == (unsigned)-1) 173 return 0; 174 sbi->sb_n_free_dnodes = c; 175 } 176 return sbi->sb_n_free_dnodes; 177 } 178 179 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) 180 { 181 struct super_block *s = dentry->d_sb; 182 struct hpfs_sb_info *sbi = hpfs_sb(s); 183 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 184 185 hpfs_lock(s); 186 187 if (sbi->sb_n_free == (unsigned)-1) 188 sbi->sb_n_free = count_bitmaps(s); 189 190 buf->f_type = s->s_magic; 191 buf->f_bsize = 512; 192 buf->f_blocks = sbi->sb_fs_size; 193 buf->f_bfree = sbi->sb_n_free; 194 buf->f_bavail = sbi->sb_n_free; 195 buf->f_files = sbi->sb_dirband_size / 4; 196 buf->f_ffree = hpfs_get_free_dnodes(s); 197 buf->f_fsid = u64_to_fsid(id); 198 buf->f_namelen = 254; 199 200 hpfs_unlock(s); 201 202 return 0; 203 } 204 205 206 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg) 207 { 208 switch (cmd) { 209 case FITRIM: { 210 struct fstrim_range range; 211 secno n_trimmed; 212 int r; 213 if (!capable(CAP_SYS_ADMIN)) 214 return -EPERM; 215 if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) 216 return -EFAULT; 217 r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed); 218 if (r) 219 return r; 220 range.len = (u64)n_trimmed << 9; 221 if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range))) 222 return -EFAULT; 223 return 0; 224 } 225 default: { 226 return -ENOIOCTLCMD; 227 } 228 } 229 } 230 231 232 static struct kmem_cache * hpfs_inode_cachep; 233 234 static struct inode *hpfs_alloc_inode(struct super_block *sb) 235 { 236 struct hpfs_inode_info *ei; 237 ei = alloc_inode_sb(sb, hpfs_inode_cachep, GFP_NOFS); 238 if (!ei) 239 return NULL; 240 return &ei->vfs_inode; 241 } 242 243 static void hpfs_free_inode(struct inode *inode) 244 { 245 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); 246 } 247 248 static void init_once(void *foo) 249 { 250 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; 251 252 inode_init_once(&ei->vfs_inode); 253 } 254 255 static int init_inodecache(void) 256 { 257 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", 258 sizeof(struct hpfs_inode_info), 259 0, (SLAB_RECLAIM_ACCOUNT| 260 SLAB_ACCOUNT), 261 init_once); 262 if (hpfs_inode_cachep == NULL) 263 return -ENOMEM; 264 return 0; 265 } 266 267 static void destroy_inodecache(void) 268 { 269 /* 270 * Make sure all delayed rcu free inodes are flushed before we 271 * destroy cache. 272 */ 273 rcu_barrier(); 274 kmem_cache_destroy(hpfs_inode_cachep); 275 } 276 277 enum { 278 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case, 279 Opt_check, Opt_err, Opt_eas, Opt_chkdsk, Opt_timeshift, 280 }; 281 282 static const struct constant_table hpfs_param_case[] = { 283 {"asis", 0}, 284 {"lower", 1}, 285 {} 286 }; 287 288 static const struct constant_table hpfs_param_check[] = { 289 {"none", 0}, 290 {"normal", 1}, 291 {"strict", 2}, 292 {} 293 }; 294 295 static const struct constant_table hpfs_param_err[] = { 296 {"continue", 0}, 297 {"remount-ro", 1}, 298 {"panic", 2}, 299 {} 300 }; 301 302 static const struct constant_table hpfs_param_eas[] = { 303 {"no", 0}, 304 {"ro", 1}, 305 {"rw", 2}, 306 {} 307 }; 308 309 static const struct constant_table hpfs_param_chkdsk[] = { 310 {"no", 0}, 311 {"errors", 1}, 312 {"always", 2}, 313 {} 314 }; 315 316 static const struct fs_parameter_spec hpfs_param_spec[] = { 317 fsparam_flag ("help", Opt_help), 318 fsparam_uid ("uid", Opt_uid), 319 fsparam_gid ("gid", Opt_gid), 320 fsparam_u32oct ("umask", Opt_umask), 321 fsparam_enum ("case", Opt_case, hpfs_param_case), 322 fsparam_enum ("check", Opt_check, hpfs_param_check), 323 fsparam_enum ("errors", Opt_err, hpfs_param_err), 324 fsparam_enum ("eas", Opt_eas, hpfs_param_eas), 325 fsparam_enum ("chkdsk", Opt_chkdsk, hpfs_param_chkdsk), 326 fsparam_s32 ("timeshift", Opt_timeshift), 327 {} 328 }; 329 330 struct hpfs_fc_context { 331 kuid_t uid; 332 kgid_t gid; 333 umode_t umask; 334 int lowercase; 335 int eas; 336 int chk; 337 int errs; 338 int chkdsk; 339 int timeshift; 340 }; 341 342 static inline void hpfs_help(void) 343 { 344 pr_info("\n\ 345 HPFS filesystem options:\n\ 346 help do not mount and display this text\n\ 347 uid=xxx set uid of files that don't have uid specified in eas\n\ 348 gid=xxx set gid of files that don't have gid specified in eas\n\ 349 umask=xxx set mode of files that don't have mode specified in eas\n\ 350 case=lower lowercase all files\n\ 351 case=asis do not lowercase files (default)\n\ 352 check=none no fs checks - kernel may crash on corrupted filesystem\n\ 353 check=normal do some checks - it should not crash (default)\n\ 354 check=strict do extra time-consuming checks, used for debugging\n\ 355 errors=continue continue on errors\n\ 356 errors=remount-ro remount read-only if errors found (default)\n\ 357 errors=panic panic on errors\n\ 358 chkdsk=no do not mark fs for chkdsking even if there were errors\n\ 359 chkdsk=errors mark fs dirty if errors found (default)\n\ 360 chkdsk=always always mark fs dirty - used for debugging\n\ 361 eas=no ignore extended attributes\n\ 362 eas=ro read but do not write extended attributes\n\ 363 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ 364 timeshift=nnn add nnn seconds to file times\n\ 365 \n"); 366 } 367 368 static int hpfs_parse_param(struct fs_context *fc, struct fs_parameter *param) 369 { 370 struct hpfs_fc_context *ctx = fc->fs_private; 371 struct fs_parse_result result; 372 int opt; 373 374 opt = fs_parse(fc, hpfs_param_spec, param, &result); 375 if (opt < 0) 376 return opt; 377 378 switch (opt) { 379 case Opt_help: 380 hpfs_help(); 381 return -EINVAL; 382 case Opt_uid: 383 ctx->uid = result.uid; 384 break; 385 case Opt_gid: 386 ctx->gid = result.gid; 387 break; 388 case Opt_umask: 389 ctx->umask = result.uint_32; 390 break; 391 case Opt_case: 392 ctx->lowercase = result.uint_32; 393 break; 394 case Opt_check: 395 ctx->chk = result.uint_32; 396 break; 397 case Opt_err: 398 ctx->errs = result.uint_32; 399 break; 400 case Opt_eas: 401 ctx->eas = result.uint_32; 402 break; 403 case Opt_chkdsk: 404 ctx->chkdsk = result.uint_32; 405 break; 406 case Opt_timeshift: 407 { 408 char *rhs = param->string; 409 int timeshift; 410 411 if (kstrtoint(rhs, 0, ×hift)) 412 return -EINVAL; 413 ctx->timeshift = timeshift; 414 break; 415 } 416 default: 417 return -EINVAL; 418 } 419 420 return 0; 421 } 422 423 static int hpfs_reconfigure(struct fs_context *fc) 424 { 425 struct hpfs_fc_context *ctx = fc->fs_private; 426 struct super_block *s = fc->root->d_sb; 427 struct hpfs_sb_info *sbi = hpfs_sb(s); 428 429 sync_filesystem(s); 430 431 fc->sb_flags |= SB_NOATIME; 432 433 hpfs_lock(s); 434 435 if (ctx->timeshift != sbi->sb_timeshift) { 436 pr_err("timeshift can't be changed using remount.\n"); 437 goto out_err; 438 } 439 440 unmark_dirty(s); 441 442 sbi->sb_uid = ctx->uid; sbi->sb_gid = ctx->gid; 443 sbi->sb_mode = 0777 & ~ctx->umask; 444 sbi->sb_lowercase = ctx->lowercase; 445 sbi->sb_eas = ctx->eas; sbi->sb_chk = ctx->chk; 446 sbi->sb_chkdsk = ctx->chkdsk; 447 sbi->sb_err = ctx->errs; sbi->sb_timeshift = ctx->timeshift; 448 449 if (!(fc->sb_flags & SB_RDONLY)) mark_dirty(s, 1); 450 451 hpfs_unlock(s); 452 return 0; 453 454 out_err: 455 hpfs_unlock(s); 456 return -EINVAL; 457 } 458 459 static int hpfs_show_options(struct seq_file *seq, struct dentry *root) 460 { 461 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb); 462 463 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid)); 464 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid)); 465 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777)); 466 if (sbi->sb_lowercase) 467 seq_printf(seq, ",case=lower"); 468 if (!sbi->sb_chk) 469 seq_printf(seq, ",check=none"); 470 if (sbi->sb_chk == 2) 471 seq_printf(seq, ",check=strict"); 472 if (!sbi->sb_err) 473 seq_printf(seq, ",errors=continue"); 474 if (sbi->sb_err == 2) 475 seq_printf(seq, ",errors=panic"); 476 if (!sbi->sb_chkdsk) 477 seq_printf(seq, ",chkdsk=no"); 478 if (sbi->sb_chkdsk == 2) 479 seq_printf(seq, ",chkdsk=always"); 480 if (!sbi->sb_eas) 481 seq_printf(seq, ",eas=no"); 482 if (sbi->sb_eas == 1) 483 seq_printf(seq, ",eas=ro"); 484 if (sbi->sb_timeshift) 485 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift); 486 return 0; 487 } 488 489 /* Super operations */ 490 491 static const struct super_operations hpfs_sops = 492 { 493 .alloc_inode = hpfs_alloc_inode, 494 .free_inode = hpfs_free_inode, 495 .evict_inode = hpfs_evict_inode, 496 .put_super = hpfs_put_super, 497 .statfs = hpfs_statfs, 498 .show_options = hpfs_show_options, 499 }; 500 501 static int hpfs_fill_super(struct super_block *s, struct fs_context *fc) 502 { 503 struct hpfs_fc_context *ctx = fc->fs_private; 504 struct buffer_head *bh0, *bh1, *bh2; 505 struct hpfs_boot_block *bootblock; 506 struct hpfs_super_block *superblock; 507 struct hpfs_spare_block *spareblock; 508 struct hpfs_sb_info *sbi; 509 struct inode *root; 510 int silent = fc->sb_flags & SB_SILENT; 511 512 dnode_secno root_dno; 513 struct hpfs_dirent *de = NULL; 514 struct quad_buffer_head qbh; 515 516 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 517 if (!sbi) { 518 return -ENOMEM; 519 } 520 s->s_fs_info = sbi; 521 522 mutex_init(&sbi->hpfs_mutex); 523 hpfs_lock(s); 524 525 /*sbi->sb_mounting = 1;*/ 526 sb_set_blocksize(s, 512); 527 sbi->sb_fs_size = -1; 528 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; 529 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; 530 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; 531 532 /* Check magics */ 533 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC 534 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC 535 || le32_to_cpu(spareblock->magic) != SP_MAGIC) { 536 if (!silent) 537 pr_err("Bad magic ... probably not HPFS\n"); 538 goto bail4; 539 } 540 541 /* Check version */ 542 if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) { 543 pr_err("Bad version %d,%d. Mount readonly to go around\n", 544 (int)superblock->version, (int)superblock->funcversion); 545 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"); 546 goto bail4; 547 } 548 549 s->s_flags |= SB_NOATIME; 550 551 /* Fill superblock stuff */ 552 s->s_magic = HPFS_SUPER_MAGIC; 553 s->s_op = &hpfs_sops; 554 set_default_d_op(s, &hpfs_dentry_operations); 555 s->s_time_min = local_to_gmt(s, 0); 556 s->s_time_max = local_to_gmt(s, U32_MAX); 557 558 sbi->sb_root = le32_to_cpu(superblock->root); 559 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); 560 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); 561 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); 562 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); 563 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); 564 sbi->sb_uid = ctx->uid; 565 sbi->sb_gid = ctx->gid; 566 sbi->sb_mode = 0777 & ~ctx->umask; 567 sbi->sb_n_free = -1; 568 sbi->sb_n_free_dnodes = -1; 569 sbi->sb_lowercase = ctx->lowercase; 570 sbi->sb_eas = ctx->eas; 571 sbi->sb_chk = ctx->chk; 572 sbi->sb_chkdsk = ctx->chkdsk; 573 sbi->sb_err = ctx->errs; 574 sbi->sb_timeshift = ctx->timeshift; 575 sbi->sb_was_error = 0; 576 sbi->sb_cp_table = NULL; 577 sbi->sb_c_bitmap = -1; 578 sbi->sb_max_fwd_alloc = 0xffffff; 579 580 if (sbi->sb_fs_size >= 0x80000000) { 581 hpfs_error(s, "invalid size in superblock: %08x", 582 (unsigned)sbi->sb_fs_size); 583 goto bail4; 584 } 585 586 if (spareblock->n_spares_used) 587 hpfs_load_hotfix_map(s, spareblock); 588 589 /* Load bitmap directory */ 590 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) 591 goto bail4; 592 593 /* Check for general fs errors*/ 594 if (spareblock->dirty && !spareblock->old_wrote) { 595 if (sbi->sb_err == 2) { 596 pr_err("Improperly stopped, not mounted\n"); 597 goto bail4; 598 } 599 hpfs_error(s, "improperly stopped"); 600 } 601 602 if (!sb_rdonly(s)) { 603 spareblock->dirty = 1; 604 spareblock->old_wrote = 0; 605 mark_buffer_dirty(bh2); 606 } 607 608 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { 609 if (sbi->sb_err >= 2) { 610 pr_err("Spare dnodes used, try chkdsk\n"); 611 mark_dirty(s, 0); 612 goto bail4; 613 } 614 hpfs_error(s, "warning: spare dnodes used, try chkdsk"); 615 if (sbi->sb_err == 0) 616 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); 617 } 618 if (sbi->sb_chk) { 619 unsigned a; 620 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || 621 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { 622 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", 623 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); 624 goto bail4; 625 } 626 a = sbi->sb_dirband_size; 627 sbi->sb_dirband_size = 0; 628 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || 629 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || 630 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { 631 mark_dirty(s, 0); 632 goto bail4; 633 } 634 sbi->sb_dirband_size = a; 635 } else 636 pr_err("You really don't want any checks? You are crazy...\n"); 637 638 /* Load code page table */ 639 if (le32_to_cpu(spareblock->n_code_pages)) 640 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) 641 pr_err("code page support is disabled\n"); 642 643 brelse(bh2); 644 brelse(bh1); 645 brelse(bh0); 646 647 root = iget_locked(s, sbi->sb_root); 648 if (!root) 649 goto bail0; 650 hpfs_init_inode(root); 651 hpfs_read_inode(root); 652 unlock_new_inode(root); 653 s->s_root = d_make_root(root); 654 if (!s->s_root) 655 goto bail0; 656 657 /* 658 * find the root directory's . pointer & finish filling in the inode 659 */ 660 661 root_dno = hpfs_fnode_dno(s, sbi->sb_root); 662 if (root_dno) 663 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); 664 if (!de) 665 hpfs_error(s, "unable to find root dir"); 666 else { 667 inode_set_atime(root, 668 local_to_gmt(s, le32_to_cpu(de->read_date)), 669 0); 670 inode_set_mtime(root, 671 local_to_gmt(s, le32_to_cpu(de->write_date)), 672 0); 673 inode_set_ctime(root, 674 local_to_gmt(s, le32_to_cpu(de->creation_date)), 675 0); 676 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); 677 hpfs_i(root)->i_parent_dir = root->i_ino; 678 if (root->i_size == -1) 679 root->i_size = 2048; 680 if (root->i_blocks == -1) 681 root->i_blocks = 5; 682 hpfs_brelse4(&qbh); 683 } 684 hpfs_unlock(s); 685 return 0; 686 687 bail4: brelse(bh2); 688 bail3: brelse(bh1); 689 bail2: brelse(bh0); 690 bail1: 691 bail0: 692 hpfs_unlock(s); 693 free_sbi(sbi); 694 return -EINVAL; 695 } 696 697 static int hpfs_get_tree(struct fs_context *fc) 698 { 699 return get_tree_bdev(fc, hpfs_fill_super); 700 } 701 702 static void hpfs_free_fc(struct fs_context *fc) 703 { 704 kfree(fc->fs_private); 705 } 706 707 static const struct fs_context_operations hpfs_fc_context_ops = { 708 .parse_param = hpfs_parse_param, 709 .get_tree = hpfs_get_tree, 710 .reconfigure = hpfs_reconfigure, 711 .free = hpfs_free_fc, 712 }; 713 714 static int hpfs_init_fs_context(struct fs_context *fc) 715 { 716 struct hpfs_fc_context *ctx; 717 718 ctx = kzalloc(sizeof(struct hpfs_fc_context), GFP_KERNEL); 719 if (!ctx) 720 return -ENOMEM; 721 722 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 723 struct super_block *sb = fc->root->d_sb; 724 struct hpfs_sb_info *sbi = hpfs_sb(sb); 725 726 ctx->uid = sbi->sb_uid; 727 ctx->gid = sbi->sb_gid; 728 ctx->umask = 0777 & ~sbi->sb_mode; 729 ctx->lowercase = sbi->sb_lowercase; 730 ctx->eas = sbi->sb_eas; 731 ctx->chk = sbi->sb_chk; 732 ctx->chkdsk = sbi->sb_chkdsk; 733 ctx->errs = sbi->sb_err; 734 ctx->timeshift = sbi->sb_timeshift; 735 736 } else { 737 ctx->uid = current_uid(); 738 ctx->gid = current_gid(); 739 ctx->umask = current_umask(); 740 ctx->lowercase = 0; 741 ctx->eas = 2; 742 ctx->chk = 1; 743 ctx->errs = 1; 744 ctx->chkdsk = 1; 745 ctx->timeshift = 0; 746 } 747 748 fc->fs_private = ctx; 749 fc->ops = &hpfs_fc_context_ops; 750 751 return 0; 752 }; 753 754 static struct file_system_type hpfs_fs_type = { 755 .owner = THIS_MODULE, 756 .name = "hpfs", 757 .kill_sb = kill_block_super, 758 .fs_flags = FS_REQUIRES_DEV, 759 .init_fs_context = hpfs_init_fs_context, 760 .parameters = hpfs_param_spec, 761 }; 762 MODULE_ALIAS_FS("hpfs"); 763 764 static int __init init_hpfs_fs(void) 765 { 766 int err = init_inodecache(); 767 if (err) 768 goto out1; 769 err = register_filesystem(&hpfs_fs_type); 770 if (err) 771 goto out; 772 return 0; 773 out: 774 destroy_inodecache(); 775 out1: 776 return err; 777 } 778 779 static void __exit exit_hpfs_fs(void) 780 { 781 unregister_filesystem(&hpfs_fs_type); 782 destroy_inodecache(); 783 } 784 785 module_init(init_hpfs_fs) 786 module_exit(exit_hpfs_fs) 787 MODULE_DESCRIPTION("OS/2 HPFS file system support"); 788 MODULE_LICENSE("GPL"); 789