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