kernel/fs/hpfs/super.c

   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 void hpfs_error(struct super_block *s, const char *fmt, ...)
  56 {
  57         struct va_format vaf;
  58         va_list args;
  59
  60         va_start(args, fmt);
  61
  62         vaf.fmt = fmt;
  63         vaf.va = &args;
  64
  65         pr_err("filesystem error: %pV", &vaf);
  66
  67         va_end(args);
  68
  69         if (!hpfs_sb(s)->sb_was_error) {
  70                 if (hpfs_sb(s)->sb_err == 2) {
  71                         pr_cont("; crashing the system because you wanted it\n");
  72                         mark_dirty(s, 0);
  73                         panic("HPFS panic");
  74                 } else if (hpfs_sb(s)->sb_err == 1) {
  75                         if (s->s_flags & MS_RDONLY)
  76                                 pr_cont("; already mounted read-only\n");
  77                         else {
  78                                 pr_cont("; remounting read-only\n");
  79                                 mark_dirty(s, 0);
  80                                 s->s_flags |= MS_RDONLY;
  81                         }
  82                 } else if (s->s_flags & MS_RDONLY)
  83                                 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
  84                 else
  85                         pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  86         } else
  87                 pr_cont("\n");
  88         hpfs_sb(s)->sb_was_error = 1;
  89 }
  90
  91 /*
  92  * A little trick to detect cycles in many hpfs structures and don't let the
  93  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  94  *
  95  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  96  * nested each in other, chkdsk locked up happilly.
  97  */
  98
  99 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
 100                 char *msg)
 101 {
 102         if (*c2 && *c1 == key) {
 103                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
 104                 return 1;
 105         }
 106         (*c2)++;
 107         if (!((*c2 - 1) & *c2)) *c1 = key;
 108         return 0;
 109 }
 110
 111 static void free_sbi(struct hpfs_sb_info *sbi)
 112 {
 113         kfree(sbi->sb_cp_table);
 114         kfree(sbi->sb_bmp_dir);
 115         kfree(sbi);
 116 }
 117
 118 static void lazy_free_sbi(struct rcu_head *rcu)
 119 {
 120         free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
 121 }
 122
 123 static void hpfs_put_super(struct super_block *s)
 124 {
 125         hpfs_lock(s);
 126         unmark_dirty(s);
 127         hpfs_unlock(s);
 128         call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
 129 }
 130
 131 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 132 {
 133         struct quad_buffer_head qbh;
 134         unsigned long *bits;
 135         unsigned count;
 136
 137         bits = hpfs_map_4sectors(s, secno, &qbh, 0);
 138         if (!bits)
 139                 return (unsigned)-1;
 140         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 141         hpfs_brelse4(&qbh);
 142         return count;
 143 }
 144
 145 static unsigned count_bitmaps(struct super_block *s)
 146 {
 147         unsigned n, count, n_bands;
 148         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 149         count = 0;
 150         for (n = 0; n < COUNT_RD_AHEAD; n++) {
 151                 hpfs_prefetch_bitmap(s, n);
 152         }
 153         for (n = 0; n < n_bands; n++) {
 154                 unsigned c;
 155                 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
 156                 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
 157                 if (c != (unsigned)-1)
 158                         count += c;
 159         }
 160         return count;
 161 }
 162
 163 unsigned hpfs_get_free_dnodes(struct super_block *s)
 164 {
 165         struct hpfs_sb_info *sbi = hpfs_sb(s);
 166         if (sbi->sb_n_free_dnodes == (unsigned)-1) {
 167                 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 168                 if (c == (unsigned)-1)
 169                         return 0;
 170                 sbi->sb_n_free_dnodes = c;
 171         }
 172         return sbi->sb_n_free_dnodes;
 173 }
 174
 175 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 176 {
 177         struct super_block *s = dentry->d_sb;
 178         struct hpfs_sb_info *sbi = hpfs_sb(s);
 179         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 180
 181         hpfs_lock(s);
 182
 183         if (sbi->sb_n_free == (unsigned)-1)
 184                 sbi->sb_n_free = count_bitmaps(s);
 185
 186         buf->f_type = s->s_magic;
 187         buf->f_bsize = 512;
 188         buf->f_blocks = sbi->sb_fs_size;
 189         buf->f_bfree = sbi->sb_n_free;
 190         buf->f_bavail = sbi->sb_n_free;
 191         buf->f_files = sbi->sb_dirband_size / 4;
 192         buf->f_ffree = hpfs_get_free_dnodes(s);
 193         buf->f_fsid.val[0] = (u32)id;
 194         buf->f_fsid.val[1] = (u32)(id >> 32);
 195         buf->f_namelen = 254;
 196
 197         hpfs_unlock(s);
 198
 199         return 0;
 200 }
 201
 202 static struct kmem_cache * hpfs_inode_cachep;
 203
 204 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 205 {
 206         struct hpfs_inode_info *ei;
 207         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 208         if (!ei)
 209                 return NULL;
 210         ei->vfs_inode.i_version = 1;
 211         return &ei->vfs_inode;
 212 }
 213
 214 static void hpfs_i_callback(struct rcu_head *head)
 215 {
 216         struct inode *inode = container_of(head, struct inode, i_rcu);
 217         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 218 }
 219
 220 static void hpfs_destroy_inode(struct inode *inode)
 221 {
 222         call_rcu(&inode->i_rcu, hpfs_i_callback);
 223 }
 224
 225 static void init_once(void *foo)
 226 {
 227         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 228
 229         inode_init_once(&ei->vfs_inode);
 230 }
 231
 232 static int init_inodecache(void)
 233 {
 234         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 235                                              sizeof(struct hpfs_inode_info),
 236                                              0, (SLAB_RECLAIM_ACCOUNT|
 237                                                 SLAB_MEM_SPREAD),
 238                                              init_once);
 239         if (hpfs_inode_cachep == NULL)
 240                 return -ENOMEM;
 241         return 0;
 242 }
 243
 244 static void destroy_inodecache(void)
 245 {
 246         /*
 247          * Make sure all delayed rcu free inodes are flushed before we
 248          * destroy cache.
 249          */
 250         rcu_barrier();
 251         kmem_cache_destroy(hpfs_inode_cachep);
 252 }
 253
 254 /*
 255  * A tiny parser for option strings, stolen from dosfs.
 256  * Stolen again from read-only hpfs.
 257  * And updated for table-driven option parsing.
 258  */
 259
 260 enum {
 261         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 262         Opt_check_none, Opt_check_normal, Opt_check_strict,
 263         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 264         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 265         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 266         Opt_timeshift, Opt_err,
 267 };
 268
 269 static const match_table_t tokens = {
 270         {Opt_help, "help"},
 271         {Opt_uid, "uid=%u"},
 272         {Opt_gid, "gid=%u"},
 273         {Opt_umask, "umask=%o"},
 274         {Opt_case_lower, "case=lower"},
 275         {Opt_case_asis, "case=asis"},
 276         {Opt_check_none, "check=none"},
 277         {Opt_check_normal, "check=normal"},
 278         {Opt_check_strict, "check=strict"},
 279         {Opt_err_cont, "errors=continue"},
 280         {Opt_err_ro, "errors=remount-ro"},
 281         {Opt_err_panic, "errors=panic"},
 282         {Opt_eas_no, "eas=no"},
 283         {Opt_eas_ro, "eas=ro"},
 284         {Opt_eas_rw, "eas=rw"},
 285         {Opt_chkdsk_no, "chkdsk=no"},
 286         {Opt_chkdsk_errors, "chkdsk=errors"},
 287         {Opt_chkdsk_always, "chkdsk=always"},
 288         {Opt_timeshift, "timeshift=%d"},
 289         {Opt_err, NULL},
 290 };
 291
 292 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
 293                       int *lowercase, int *eas, int *chk, int *errs,
 294                       int *chkdsk, int *timeshift)
 295 {
 296         char *p;
 297         int option;
 298
 299         if (!opts)
 300                 return 1;
 301
 302         /*pr_info("Parsing opts: '%s'\n",opts);*/
 303
 304         while ((p = strsep(&opts, ",")) != NULL) {
 305                 substring_t args[MAX_OPT_ARGS];
 306                 int token;
 307                 if (!*p)
 308                         continue;
 309
 310                 token = match_token(p, tokens, args);
 311                 switch (token) {
 312                 case Opt_help:
 313                         return 2;
 314                 case Opt_uid:
 315                         if (match_int(args, &option))
 316                                 return 0;
 317                         *uid = make_kuid(current_user_ns(), option);
 318                         if (!uid_valid(*uid))
 319                                 return 0;
 320                         break;
 321                 case Opt_gid:
 322                         if (match_int(args, &option))
 323                                 return 0;
 324                         *gid = make_kgid(current_user_ns(), option);
 325                         if (!gid_valid(*gid))
 326                                 return 0;
 327                         break;
 328                 case Opt_umask:
 329                         if (match_octal(args, &option))
 330                                 return 0;
 331                         *umask = option;
 332                         break;
 333                 case Opt_case_lower:
 334                         *lowercase = 1;
 335                         break;
 336                 case Opt_case_asis:
 337                         *lowercase = 0;
 338                         break;
 339                 case Opt_check_none:
 340                         *chk = 0;
 341                         break;
 342                 case Opt_check_normal:
 343                         *chk = 1;
 344                         break;
 345                 case Opt_check_strict:
 346                         *chk = 2;
 347                         break;
 348                 case Opt_err_cont:
 349                         *errs = 0;
 350                         break;
 351                 case Opt_err_ro:
 352                         *errs = 1;
 353                         break;
 354                 case Opt_err_panic:
 355                         *errs = 2;
 356                         break;
 357                 case Opt_eas_no:
 358                         *eas = 0;
 359                         break;
 360                 case Opt_eas_ro:
 361                         *eas = 1;
 362                         break;
 363                 case Opt_eas_rw:
 364                         *eas = 2;
 365                         break;
 366                 case Opt_chkdsk_no:
 367                         *chkdsk = 0;
 368                         break;
 369                 case Opt_chkdsk_errors:
 370                         *chkdsk = 1;
 371                         break;
 372                 case Opt_chkdsk_always:
 373                         *chkdsk = 2;
 374                         break;
 375                 case Opt_timeshift:
 376                 {
 377                         int m = 1;
 378                         char *rhs = args[0].from;
 379                         if (!rhs || !*rhs)
 380                                 return 0;
 381                         if (*rhs == '-') m = -1;
 382                         if (*rhs == '+' || *rhs == '-') rhs++;
 383                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 384                         if (*rhs)
 385                                 return 0;
 386                         break;
 387                 }
 388                 default:
 389                         return 0;
 390                 }
 391         }
 392         return 1;
 393 }
 394
 395 static inline void hpfs_help(void)
 396 {
 397         pr_info("\n\
 398 HPFS filesystem options:\n\
 399       help              do not mount and display this text\n\
 400       uid=xxx           set uid of files that don't have uid specified in eas\n\
 401       gid=xxx           set gid of files that don't have gid specified in eas\n\
 402       umask=xxx         set mode of files that don't have mode specified in eas\n\
 403       case=lower        lowercase all files\n\
 404       case=asis         do not lowercase files (default)\n\
 405       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 406       check=normal      do some checks - it should not crash (default)\n\
 407       check=strict      do extra time-consuming checks, used for debugging\n\
 408       errors=continue   continue on errors\n\
 409       errors=remount-ro remount read-only if errors found (default)\n\
 410       errors=panic      panic on errors\n\
 411       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 412       chkdsk=errors     mark fs dirty if errors found (default)\n\
 413       chkdsk=always     always mark fs dirty - used for debugging\n\
 414       eas=no            ignore extended attributes\n\
 415       eas=ro            read but do not write extended attributes\n\
 416       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 417       timeshift=nnn     add nnn seconds to file times\n\
 418 \n");
 419 }
 420
 421 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 422 {
 423         kuid_t uid;
 424         kgid_t gid;
 425         umode_t umask;
 426         int lowercase, eas, chk, errs, chkdsk, timeshift;
 427         int o;
 428         struct hpfs_sb_info *sbi = hpfs_sb(s);
 429         char *new_opts = kstrdup(data, GFP_KERNEL);
 430
 431         if (!new_opts)
 432                 return -ENOMEM;
 433
 434         sync_filesystem(s);
 435
 436         *flags |= MS_NOATIME;
 437
 438         hpfs_lock(s);
 439         uid = sbi->sb_uid; gid = sbi->sb_gid;
 440         umask = 0777 & ~sbi->sb_mode;
 441         lowercase = sbi->sb_lowercase;
 442         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 443         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 444
 445         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 446             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 447                 pr_err("bad mount options.\n");
 448                 goto out_err;
 449         }
 450         if (o == 2) {
 451                 hpfs_help();
 452                 goto out_err;
 453         }
 454         if (timeshift != sbi->sb_timeshift) {
 455                 pr_err("timeshift can't be changed using remount.\n");
 456                 goto out_err;
 457         }
 458
 459         unmark_dirty(s);
 460
 461         sbi->sb_uid = uid; sbi->sb_gid = gid;
 462         sbi->sb_mode = 0777 & ~umask;
 463         sbi->sb_lowercase = lowercase;
 464         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 465         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 466
 467         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
 468
 469         replace_mount_options(s, new_opts);
 470
 471         hpfs_unlock(s);
 472         return 0;
 473
 474 out_err:
 475         hpfs_unlock(s);
 476         kfree(new_opts);
 477         return -EINVAL;
 478 }
 479
 480 /* Super operations */
 481
 482 static const struct super_operations hpfs_sops =
 483 {
 484         .alloc_inode    = hpfs_alloc_inode,
 485         .destroy_inode  = hpfs_destroy_inode,
 486         .evict_inode    = hpfs_evict_inode,
 487         .put_super      = hpfs_put_super,
 488         .statfs         = hpfs_statfs,
 489         .remount_fs     = hpfs_remount_fs,
 490         .show_options   = generic_show_options,
 491 };
 492
 493 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 494 {
 495         struct buffer_head *bh0, *bh1, *bh2;
 496         struct hpfs_boot_block *bootblock;
 497         struct hpfs_super_block *superblock;
 498         struct hpfs_spare_block *spareblock;
 499         struct hpfs_sb_info *sbi;
 500         struct inode *root;
 501
 502         kuid_t uid;
 503         kgid_t gid;
 504         umode_t umask;
 505         int lowercase, eas, chk, errs, chkdsk, timeshift;
 506
 507         dnode_secno root_dno;
 508         struct hpfs_dirent *de = NULL;
 509         struct quad_buffer_head qbh;
 510
 511         int o;
 512
 513         save_mount_options(s, options);
 514
 515         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 516         if (!sbi) {
 517                 return -ENOMEM;
 518         }
 519         s->s_fs_info = sbi;
 520
 521         mutex_init(&sbi->hpfs_mutex);
 522         hpfs_lock(s);
 523
 524         uid = current_uid();
 525         gid = current_gid();
 526         umask = current_umask();
 527         lowercase = 0;
 528         eas = 2;
 529         chk = 1;
 530         errs = 1;
 531         chkdsk = 1;
 532         timeshift = 0;
 533
 534         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 535             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 536                 pr_err("bad mount options.\n");
 537                 goto bail0;
 538         }
 539         if (o==2) {
 540                 hpfs_help();
 541                 goto bail0;
 542         }
 543
 544         /*sbi->sb_mounting = 1;*/
 545         sb_set_blocksize(s, 512);
 546         sbi->sb_fs_size = -1;
 547         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 548         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 549         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 550
 551         /* Check magics */
 552         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 553             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 554             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 555                 if (!silent)
 556                         pr_err("Bad magic ... probably not HPFS\n");
 557                 goto bail4;
 558         }
 559
 560         /* Check version */
 561         if (!(s->s_flags & MS_RDONLY) &&
 562               superblock->funcversion != 2 && superblock->funcversion != 3) {
 563                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
 564                         (int)superblock->version, (int)superblock->funcversion);
 565                 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");
 566                 goto bail4;
 567         }
 568
 569         s->s_flags |= MS_NOATIME;
 570
 571         /* Fill superblock stuff */
 572         s->s_magic = HPFS_SUPER_MAGIC;
 573         s->s_op = &hpfs_sops;
 574         s->s_d_op = &hpfs_dentry_operations;
 575
 576         sbi->sb_root = le32_to_cpu(superblock->root);
 577         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 578         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 579         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 580         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 581         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 582         sbi->sb_uid = uid;
 583         sbi->sb_gid = gid;
 584         sbi->sb_mode = 0777 & ~umask;
 585         sbi->sb_n_free = -1;
 586         sbi->sb_n_free_dnodes = -1;
 587         sbi->sb_lowercase = lowercase;
 588         sbi->sb_eas = eas;
 589         sbi->sb_chk = chk;
 590         sbi->sb_chkdsk = chkdsk;
 591         sbi->sb_err = errs;
 592         sbi->sb_timeshift = timeshift;
 593         sbi->sb_was_error = 0;
 594         sbi->sb_cp_table = NULL;
 595         sbi->sb_c_bitmap = -1;
 596         sbi->sb_max_fwd_alloc = 0xffffff;
 597
 598         if (sbi->sb_fs_size >= 0x80000000) {
 599                 hpfs_error(s, "invalid size in superblock: %08x",
 600                         (unsigned)sbi->sb_fs_size);
 601                 goto bail4;
 602         }
 603
 604         /* Load bitmap directory */
 605         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 606                 goto bail4;
 607
 608         /* Check for general fs errors*/
 609         if (spareblock->dirty && !spareblock->old_wrote) {
 610                 if (errs == 2) {
 611                         pr_err("Improperly stopped, not mounted\n");
 612                         goto bail4;
 613                 }
 614                 hpfs_error(s, "improperly stopped");
 615         }
 616
 617         if (!(s->s_flags & MS_RDONLY)) {
 618                 spareblock->dirty = 1;
 619                 spareblock->old_wrote = 0;
 620                 mark_buffer_dirty(bh2);
 621         }
 622
 623         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 624                 if (errs >= 2) {
 625                         pr_err("Hotfixes not supported here, try chkdsk\n");
 626                         mark_dirty(s, 0);
 627                         goto bail4;
 628                 }
 629                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 630                 if (errs == 0)
 631                         pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 632                 else
 633                         pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n");
 634         }
 635         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 636                 if (errs >= 2) {
 637                         pr_err("Spare dnodes used, try chkdsk\n");
 638                         mark_dirty(s, 0);
 639                         goto bail4;
 640                 }
 641                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 642                 if (errs == 0)
 643                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 644         }
 645         if (chk) {
 646                 unsigned a;
 647                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 648                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 649                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 650                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 651                         goto bail4;
 652                 }
 653                 a = sbi->sb_dirband_size;
 654                 sbi->sb_dirband_size = 0;
 655                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 656                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 657                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 658                         mark_dirty(s, 0);
 659                         goto bail4;
 660                 }
 661                 sbi->sb_dirband_size = a;
 662         } else
 663                 pr_err("You really don't want any checks? You are crazy...\n");
 664
 665         /* Load code page table */
 666         if (le32_to_cpu(spareblock->n_code_pages))
 667                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 668                         pr_err("code page support is disabled\n");
 669
 670         brelse(bh2);
 671         brelse(bh1);
 672         brelse(bh0);
 673
 674         root = iget_locked(s, sbi->sb_root);
 675         if (!root)
 676                 goto bail0;
 677         hpfs_init_inode(root);
 678         hpfs_read_inode(root);
 679         unlock_new_inode(root);
 680         s->s_root = d_make_root(root);
 681         if (!s->s_root)
 682                 goto bail0;
 683
 684         /*
 685          * find the root directory's . pointer & finish filling in the inode
 686          */
 687
 688         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 689         if (root_dno)
 690                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 691         if (!de)
 692                 hpfs_error(s, "unable to find root dir");
 693         else {
 694                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 695                 root->i_atime.tv_nsec = 0;
 696                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 697                 root->i_mtime.tv_nsec = 0;
 698                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 699                 root->i_ctime.tv_nsec = 0;
 700                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 701                 hpfs_i(root)->i_parent_dir = root->i_ino;
 702                 if (root->i_size == -1)
 703                         root->i_size = 2048;
 704                 if (root->i_blocks == -1)
 705                         root->i_blocks = 5;
 706                 hpfs_brelse4(&qbh);
 707         }
 708         hpfs_unlock(s);
 709         return 0;
 710
 711 bail4:  brelse(bh2);
 712 bail3:  brelse(bh1);
 713 bail2:  brelse(bh0);
 714 bail1:
 715 bail0:
 716         hpfs_unlock(s);
 717         free_sbi(sbi);
 718         return -EINVAL;
 719 }
 720
 721 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 722         int flags, const char *dev_name, void *data)
 723 {
 724         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 725 }
 726
 727 static struct file_system_type hpfs_fs_type = {
 728         .owner          = THIS_MODULE,
 729         .name           = "hpfs",
 730         .mount          = hpfs_mount,
 731         .kill_sb        = kill_block_super,
 732         .fs_flags       = FS_REQUIRES_DEV,
 733 };
 734 MODULE_ALIAS_FS("hpfs");
 735
 736 static int __init init_hpfs_fs(void)
 737 {
 738         int err = init_inodecache();
 739         if (err)
 740                 goto out1;
 741         err = register_filesystem(&hpfs_fs_type);
 742         if (err)
 743                 goto out;
 744         return 0;
 745 out:
 746         destroy_inodecache();
 747 out1:
 748         return err;
 749 }
 750
 751 static void __exit exit_hpfs_fs(void)
 752 {
 753         unregister_filesystem(&hpfs_fs_type);
 754         destroy_inodecache();
 755 }
 756
 757 module_init(init_hpfs_fs)
 758 module_exit(exit_hpfs_fs)
 759 MODULE_LICENSE("GPL");