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)
  22 {
  23         if (hpfs_sb(s)->sb_chkdsk && !(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                         brelse(bh);
  31                 }
  32         }
  33 }
  34
  35 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
  36    were errors) */
  37
  38 static void unmark_dirty(struct super_block *s)
  39 {
  40         struct buffer_head *bh;
  41         struct hpfs_spare_block *sb;
  42         if (s->s_flags & MS_RDONLY) return;
  43         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  44                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
  45                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
  46                 mark_buffer_dirty(bh);
  47                 brelse(bh);
  48         }
  49 }
  50
  51 /* Filesystem error... */
  52 static char err_buf[1024];
  53
  54 void hpfs_error(struct super_block *s, const char *fmt, ...)
  55 {
  56         va_list args;
  57
  58         va_start(args, fmt);
  59         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
  60         va_end(args);
  61
  62         printk("HPFS: filesystem error: %s", err_buf);
  63         if (!hpfs_sb(s)->sb_was_error) {
  64                 if (hpfs_sb(s)->sb_err == 2) {
  65                         printk("; crashing the system because you wanted it\n");
  66                         mark_dirty(s);
  67                         panic("HPFS panic");
  68                 } else if (hpfs_sb(s)->sb_err == 1) {
  69                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
  70                         else {
  71                                 printk("; remounting read-only\n");
  72                                 mark_dirty(s);
  73                                 s->s_flags |= MS_RDONLY;
  74                         }
  75                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
  76                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  77         } else printk("\n");
  78         hpfs_sb(s)->sb_was_error = 1;
  79 }
  80
  81 /*
  82  * A little trick to detect cycles in many hpfs structures and don't let the
  83  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  84  *
  85  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  86  * nested each in other, chkdsk locked up happilly.
  87  */
  88
  89 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
  90                 char *msg)
  91 {
  92         if (*c2 && *c1 == key) {
  93                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
  94                 return 1;
  95         }
  96         (*c2)++;
  97         if (!((*c2 - 1) & *c2)) *c1 = key;
  98         return 0;
  99 }
 100
 101 static void hpfs_put_super(struct super_block *s)
 102 {
 103         struct hpfs_sb_info *sbi = hpfs_sb(s);
 104
 105         hpfs_lock(s);
 106         unmark_dirty(s);
 107         hpfs_unlock(s);
 108
 109         kfree(sbi->sb_cp_table);
 110         kfree(sbi->sb_bmp_dir);
 111         s->s_fs_info = NULL;
 112         kfree(sbi);
 113 }
 114
 115 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 116 {
 117         struct quad_buffer_head qbh;
 118         unsigned long *bits;
 119         unsigned count;
 120
 121         bits = hpfs_map_4sectors(s, secno, &qbh, 4);
 122         if (!bits)
 123                 return 0;
 124         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 125         hpfs_brelse4(&qbh);
 126         return count;
 127 }
 128
 129 static unsigned count_bitmaps(struct super_block *s)
 130 {
 131         unsigned n, count, n_bands;
 132         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 133         count = 0;
 134         for (n = 0; n < n_bands; n++)
 135                 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
 136         return count;
 137 }
 138
 139 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 140 {
 141         struct super_block *s = dentry->d_sb;
 142         struct hpfs_sb_info *sbi = hpfs_sb(s);
 143         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 144         hpfs_lock(s);
 145
 146         /*if (sbi->sb_n_free == -1) {*/
 147                 sbi->sb_n_free = count_bitmaps(s);
 148                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 149         /*}*/
 150         buf->f_type = s->s_magic;
 151         buf->f_bsize = 512;
 152         buf->f_blocks = sbi->sb_fs_size;
 153         buf->f_bfree = sbi->sb_n_free;
 154         buf->f_bavail = sbi->sb_n_free;
 155         buf->f_files = sbi->sb_dirband_size / 4;
 156         buf->f_ffree = sbi->sb_n_free_dnodes;
 157         buf->f_fsid.val[0] = (u32)id;
 158         buf->f_fsid.val[1] = (u32)(id >> 32);
 159         buf->f_namelen = 254;
 160
 161         hpfs_unlock(s);
 162
 163         return 0;
 164 }
 165
 166 static struct kmem_cache * hpfs_inode_cachep;
 167
 168 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 169 {
 170         struct hpfs_inode_info *ei;
 171         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 172         if (!ei)
 173                 return NULL;
 174         ei->vfs_inode.i_version = 1;
 175         return &ei->vfs_inode;
 176 }
 177
 178 static void hpfs_i_callback(struct rcu_head *head)
 179 {
 180         struct inode *inode = container_of(head, struct inode, i_rcu);
 181         INIT_LIST_HEAD(&inode->i_dentry);
 182         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 183 }
 184
 185 static void hpfs_destroy_inode(struct inode *inode)
 186 {
 187         call_rcu(&inode->i_rcu, hpfs_i_callback);
 188 }
 189
 190 static void init_once(void *foo)
 191 {
 192         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 193
 194         inode_init_once(&ei->vfs_inode);
 195 }
 196
 197 static int init_inodecache(void)
 198 {
 199         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 200                                              sizeof(struct hpfs_inode_info),
 201                                              0, (SLAB_RECLAIM_ACCOUNT|
 202                                                 SLAB_MEM_SPREAD),
 203                                              init_once);
 204         if (hpfs_inode_cachep == NULL)
 205                 return -ENOMEM;
 206         return 0;
 207 }
 208
 209 static void destroy_inodecache(void)
 210 {
 211         kmem_cache_destroy(hpfs_inode_cachep);
 212 }
 213
 214 /*
 215  * A tiny parser for option strings, stolen from dosfs.
 216  * Stolen again from read-only hpfs.
 217  * And updated for table-driven option parsing.
 218  */
 219
 220 enum {
 221         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 222         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
 223         Opt_check_none, Opt_check_normal, Opt_check_strict,
 224         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 225         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 226         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 227         Opt_timeshift, Opt_err,
 228 };
 229
 230 static const match_table_t tokens = {
 231         {Opt_help, "help"},
 232         {Opt_uid, "uid=%u"},
 233         {Opt_gid, "gid=%u"},
 234         {Opt_umask, "umask=%o"},
 235         {Opt_case_lower, "case=lower"},
 236         {Opt_case_asis, "case=asis"},
 237         {Opt_conv_binary, "conv=binary"},
 238         {Opt_conv_text, "conv=text"},
 239         {Opt_conv_auto, "conv=auto"},
 240         {Opt_check_none, "check=none"},
 241         {Opt_check_normal, "check=normal"},
 242         {Opt_check_strict, "check=strict"},
 243         {Opt_err_cont, "errors=continue"},
 244         {Opt_err_ro, "errors=remount-ro"},
 245         {Opt_err_panic, "errors=panic"},
 246         {Opt_eas_no, "eas=no"},
 247         {Opt_eas_ro, "eas=ro"},
 248         {Opt_eas_rw, "eas=rw"},
 249         {Opt_chkdsk_no, "chkdsk=no"},
 250         {Opt_chkdsk_errors, "chkdsk=errors"},
 251         {Opt_chkdsk_always, "chkdsk=always"},
 252         {Opt_timeshift, "timeshift=%d"},
 253         {Opt_err, NULL},
 254 };
 255
 256 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 257                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
 258                       int *chkdsk, int *timeshift)
 259 {
 260         char *p;
 261         int option;
 262
 263         if (!opts)
 264                 return 1;
 265
 266         /*printk("Parsing opts: '%s'\n",opts);*/
 267
 268         while ((p = strsep(&opts, ",")) != NULL) {
 269                 substring_t args[MAX_OPT_ARGS];
 270                 int token;
 271                 if (!*p)
 272                         continue;
 273
 274                 token = match_token(p, tokens, args);
 275                 switch (token) {
 276                 case Opt_help:
 277                         return 2;
 278                 case Opt_uid:
 279                         if (match_int(args, &option))
 280                                 return 0;
 281                         *uid = option;
 282                         break;
 283                 case Opt_gid:
 284                         if (match_int(args, &option))
 285                                 return 0;
 286                         *gid = option;
 287                         break;
 288                 case Opt_umask:
 289                         if (match_octal(args, &option))
 290                                 return 0;
 291                         *umask = option;
 292                         break;
 293                 case Opt_case_lower:
 294                         *lowercase = 1;
 295                         break;
 296                 case Opt_case_asis:
 297                         *lowercase = 0;
 298                         break;
 299                 case Opt_conv_binary:
 300                         *conv = CONV_BINARY;
 301                         break;
 302                 case Opt_conv_text:
 303                         *conv = CONV_TEXT;
 304                         break;
 305                 case Opt_conv_auto:
 306                         *conv = CONV_AUTO;
 307                         break;
 308                 case Opt_check_none:
 309                         *chk = 0;
 310                         break;
 311                 case Opt_check_normal:
 312                         *chk = 1;
 313                         break;
 314                 case Opt_check_strict:
 315                         *chk = 2;
 316                         break;
 317                 case Opt_err_cont:
 318                         *errs = 0;
 319                         break;
 320                 case Opt_err_ro:
 321                         *errs = 1;
 322                         break;
 323                 case Opt_err_panic:
 324                         *errs = 2;
 325                         break;
 326                 case Opt_eas_no:
 327                         *eas = 0;
 328                         break;
 329                 case Opt_eas_ro:
 330                         *eas = 1;
 331                         break;
 332                 case Opt_eas_rw:
 333                         *eas = 2;
 334                         break;
 335                 case Opt_chkdsk_no:
 336                         *chkdsk = 0;
 337                         break;
 338                 case Opt_chkdsk_errors:
 339                         *chkdsk = 1;
 340                         break;
 341                 case Opt_chkdsk_always:
 342                         *chkdsk = 2;
 343                         break;
 344                 case Opt_timeshift:
 345                 {
 346                         int m = 1;
 347                         char *rhs = args[0].from;
 348                         if (!rhs || !*rhs)
 349                                 return 0;
 350                         if (*rhs == '-') m = -1;
 351                         if (*rhs == '+' || *rhs == '-') rhs++;
 352                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 353                         if (*rhs)
 354                                 return 0;
 355                         break;
 356                 }
 357                 default:
 358                         return 0;
 359                 }
 360         }
 361         return 1;
 362 }
 363
 364 static inline void hpfs_help(void)
 365 {
 366         printk("\n\
 367 HPFS filesystem options:\n\
 368       help              do not mount and display this text\n\
 369       uid=xxx           set uid of files that don't have uid specified in eas\n\
 370       gid=xxx           set gid of files that don't have gid specified in eas\n\
 371       umask=xxx         set mode of files that don't have mode specified in eas\n\
 372       case=lower        lowercase all files\n\
 373       case=asis         do not lowercase files (default)\n\
 374       conv=binary       do not convert CR/LF -> LF (default)\n\
 375       conv=auto         convert only files with known text extensions\n\
 376       conv=text         convert all files\n\
 377       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 378       check=normal      do some checks - it should not crash (default)\n\
 379       check=strict      do extra time-consuming checks, used for debugging\n\
 380       errors=continue   continue on errors\n\
 381       errors=remount-ro remount read-only if errors found (default)\n\
 382       errors=panic      panic on errors\n\
 383       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 384       chkdsk=errors     mark fs dirty if errors found (default)\n\
 385       chkdsk=always     always mark fs dirty - used for debugging\n\
 386       eas=no            ignore extended attributes\n\
 387       eas=ro            read but do not write extended attributes\n\
 388       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 389       timeshift=nnn     add nnn seconds to file times\n\
 390 \n");
 391 }
 392
 393 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 394 {
 395         uid_t uid;
 396         gid_t gid;
 397         umode_t umask;
 398         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 399         int o;
 400         struct hpfs_sb_info *sbi = hpfs_sb(s);
 401         char *new_opts = kstrdup(data, GFP_KERNEL);
 402
 403         *flags |= MS_NOATIME;
 404
 405         hpfs_lock(s);
 406         lock_super(s);
 407         uid = sbi->sb_uid; gid = sbi->sb_gid;
 408         umask = 0777 & ~sbi->sb_mode;
 409         lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
 410         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 411         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 412
 413         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
 414             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 415                 printk("HPFS: bad mount options.\n");
 416                 goto out_err;
 417         }
 418         if (o == 2) {
 419                 hpfs_help();
 420                 goto out_err;
 421         }
 422         if (timeshift != sbi->sb_timeshift) {
 423                 printk("HPFS: timeshift can't be changed using remount.\n");
 424                 goto out_err;
 425         }
 426
 427         unmark_dirty(s);
 428
 429         sbi->sb_uid = uid; sbi->sb_gid = gid;
 430         sbi->sb_mode = 0777 & ~umask;
 431         sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
 432         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 433         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 434
 435         if (!(*flags & MS_RDONLY)) mark_dirty(s);
 436
 437         replace_mount_options(s, new_opts);
 438
 439         unlock_super(s);
 440         hpfs_unlock(s);
 441         return 0;
 442
 443 out_err:
 444         unlock_super(s);
 445         hpfs_unlock(s);
 446         kfree(new_opts);
 447         return -EINVAL;
 448 }
 449
 450 /* Super operations */
 451
 452 static const struct super_operations hpfs_sops =
 453 {
 454         .alloc_inode    = hpfs_alloc_inode,
 455         .destroy_inode  = hpfs_destroy_inode,
 456         .evict_inode    = hpfs_evict_inode,
 457         .put_super      = hpfs_put_super,
 458         .statfs         = hpfs_statfs,
 459         .remount_fs     = hpfs_remount_fs,
 460         .show_options   = generic_show_options,
 461 };
 462
 463 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 464 {
 465         struct buffer_head *bh0, *bh1, *bh2;
 466         struct hpfs_boot_block *bootblock;
 467         struct hpfs_super_block *superblock;
 468         struct hpfs_spare_block *spareblock;
 469         struct hpfs_sb_info *sbi;
 470         struct inode *root;
 471
 472         uid_t uid;
 473         gid_t gid;
 474         umode_t umask;
 475         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 476
 477         dnode_secno root_dno;
 478         struct hpfs_dirent *de = NULL;
 479         struct quad_buffer_head qbh;
 480
 481         int o;
 482
 483         save_mount_options(s, options);
 484
 485         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 486         if (!sbi) {
 487                 return -ENOMEM;
 488         }
 489         s->s_fs_info = sbi;
 490
 491         sbi->sb_bmp_dir = NULL;
 492         sbi->sb_cp_table = NULL;
 493
 494         mutex_init(&sbi->hpfs_mutex);
 495         hpfs_lock(s);
 496
 497         uid = current_uid();
 498         gid = current_gid();
 499         umask = current_umask();
 500         lowercase = 0;
 501         conv = CONV_BINARY;
 502         eas = 2;
 503         chk = 1;
 504         errs = 1;
 505         chkdsk = 1;
 506         timeshift = 0;
 507
 508         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
 509             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 510                 printk("HPFS: bad mount options.\n");
 511                 goto bail0;
 512         }
 513         if (o==2) {
 514                 hpfs_help();
 515                 goto bail0;
 516         }
 517
 518         /*sbi->sb_mounting = 1;*/
 519         sb_set_blocksize(s, 512);
 520         sbi->sb_fs_size = -1;
 521         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 522         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 523         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 524
 525         /* Check magics */
 526         if (/*bootblock->magic != BB_MAGIC
 527             ||*/ superblock->magic != SB_MAGIC
 528             || spareblock->magic != SP_MAGIC) {
 529                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
 530                 goto bail4;
 531         }
 532
 533         /* Check version */
 534         if (!(s->s_flags & MS_RDONLY) &&
 535               superblock->funcversion != 2 && superblock->funcversion != 3) {
 536                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
 537                         (int)superblock->version, (int)superblock->funcversion);
 538                 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");
 539                 goto bail4;
 540         }
 541
 542         s->s_flags |= MS_NOATIME;
 543
 544         /* Fill superblock stuff */
 545         s->s_magic = HPFS_SUPER_MAGIC;
 546         s->s_op = &hpfs_sops;
 547         s->s_d_op = &hpfs_dentry_operations;
 548
 549         sbi->sb_root = superblock->root;
 550         sbi->sb_fs_size = superblock->n_sectors;
 551         sbi->sb_bitmaps = superblock->bitmaps;
 552         sbi->sb_dirband_start = superblock->dir_band_start;
 553         sbi->sb_dirband_size = superblock->n_dir_band;
 554         sbi->sb_dmap = superblock->dir_band_bitmap;
 555         sbi->sb_uid = uid;
 556         sbi->sb_gid = gid;
 557         sbi->sb_mode = 0777 & ~umask;
 558         sbi->sb_n_free = -1;
 559         sbi->sb_n_free_dnodes = -1;
 560         sbi->sb_lowercase = lowercase;
 561         sbi->sb_conv = conv;
 562         sbi->sb_eas = eas;
 563         sbi->sb_chk = chk;
 564         sbi->sb_chkdsk = chkdsk;
 565         sbi->sb_err = errs;
 566         sbi->sb_timeshift = timeshift;
 567         sbi->sb_was_error = 0;
 568         sbi->sb_cp_table = NULL;
 569         sbi->sb_c_bitmap = -1;
 570         sbi->sb_max_fwd_alloc = 0xffffff;
 571
 572         /* Load bitmap directory */
 573         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
 574                 goto bail4;
 575
 576         /* Check for general fs errors*/
 577         if (spareblock->dirty && !spareblock->old_wrote) {
 578                 if (errs == 2) {
 579                         printk("HPFS: Improperly stopped, not mounted\n");
 580                         goto bail4;
 581                 }
 582                 hpfs_error(s, "improperly stopped");
 583         }
 584
 585         if (!(s->s_flags & MS_RDONLY)) {
 586                 spareblock->dirty = 1;
 587                 spareblock->old_wrote = 0;
 588                 mark_buffer_dirty(bh2);
 589         }
 590
 591         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 592                 if (errs >= 2) {
 593                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 594                         mark_dirty(s);
 595                         goto bail4;
 596                 }
 597                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 598                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 599                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 600         }
 601         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
 602                 if (errs >= 2) {
 603                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 604                         mark_dirty(s);
 605                         goto bail4;
 606                 }
 607                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 608                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 609         }
 610         if (chk) {
 611                 unsigned a;
 612                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
 613                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
 614                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 615                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
 616                         goto bail4;
 617                 }
 618                 a = sbi->sb_dirband_size;
 619                 sbi->sb_dirband_size = 0;
 620                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
 621                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
 622                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
 623                         mark_dirty(s);
 624                         goto bail4;
 625                 }
 626                 sbi->sb_dirband_size = a;
 627         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 628
 629         /* Load code page table */
 630         if (spareblock->n_code_pages)
 631                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
 632                         printk("HPFS: Warning: code page support is disabled\n");
 633
 634         brelse(bh2);
 635         brelse(bh1);
 636         brelse(bh0);
 637
 638         root = iget_locked(s, sbi->sb_root);
 639         if (!root)
 640                 goto bail0;
 641         hpfs_init_inode(root);
 642         hpfs_read_inode(root);
 643         unlock_new_inode(root);
 644         s->s_root = d_alloc_root(root);
 645         if (!s->s_root) {
 646                 iput(root);
 647                 goto bail0;
 648         }
 649
 650         /*
 651          * find the root directory's . pointer & finish filling in the inode
 652          */
 653
 654         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 655         if (root_dno)
 656                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 657         if (!de)
 658                 hpfs_error(s, "unable to find root dir");
 659         else {
 660                 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
 661                 root->i_atime.tv_nsec = 0;
 662                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
 663                 root->i_mtime.tv_nsec = 0;
 664                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
 665                 root->i_ctime.tv_nsec = 0;
 666                 hpfs_i(root)->i_ea_size = de->ea_size;
 667                 hpfs_i(root)->i_parent_dir = root->i_ino;
 668                 if (root->i_size == -1)
 669                         root->i_size = 2048;
 670                 if (root->i_blocks == -1)
 671                         root->i_blocks = 5;
 672                 hpfs_brelse4(&qbh);
 673         }
 674         hpfs_unlock(s);
 675         return 0;
 676
 677 bail4:  brelse(bh2);
 678 bail3:  brelse(bh1);
 679 bail2:  brelse(bh0);
 680 bail1:
 681 bail0:
 682         hpfs_unlock(s);
 683         kfree(sbi->sb_bmp_dir);
 684         kfree(sbi->sb_cp_table);
 685         s->s_fs_info = NULL;
 686         kfree(sbi);
 687         return -EINVAL;
 688 }
 689
 690 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 691         int flags, const char *dev_name, void *data)
 692 {
 693         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 694 }
 695
 696 static struct file_system_type hpfs_fs_type = {
 697         .owner          = THIS_MODULE,
 698         .name           = "hpfs",
 699         .mount          = hpfs_mount,
 700         .kill_sb        = kill_block_super,
 701         .fs_flags       = FS_REQUIRES_DEV,
 702 };
 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");