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
  17 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
  18
  19 static void mark_dirty(struct super_block *s)
  20 {
  21         if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
  22                 struct buffer_head *bh;
  23                 struct hpfs_spare_block *sb;
  24                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  25                         sb->dirty = 1;
  26                         sb->old_wrote = 0;
  27                         mark_buffer_dirty(bh);
  28                         brelse(bh);
  29                 }
  30         }
  31 }
  32
  33 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
  34    were errors) */
  35
  36 static void unmark_dirty(struct super_block *s)
  37 {
  38         struct buffer_head *bh;
  39         struct hpfs_spare_block *sb;
  40         if (s->s_flags & MS_RDONLY) return;
  41         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  42                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
  43                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
  44                 mark_buffer_dirty(bh);
  45                 brelse(bh);
  46         }
  47 }
  48
  49 /* Filesystem error... */
  50 static char err_buf[1024];
  51
  52 void hpfs_error(struct super_block *s, const char *fmt, ...)
  53 {
  54         va_list args;
  55
  56         va_start(args, fmt);
  57         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
  58         va_end(args);
  59
  60         printk("HPFS: filesystem error: %s", err_buf);
  61         if (!hpfs_sb(s)->sb_was_error) {
  62                 if (hpfs_sb(s)->sb_err == 2) {
  63                         printk("; crashing the system because you wanted it\n");
  64                         mark_dirty(s);
  65                         panic("HPFS panic");
  66                 } else if (hpfs_sb(s)->sb_err == 1) {
  67                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
  68                         else {
  69                                 printk("; remounting read-only\n");
  70                                 mark_dirty(s);
  71                                 s->s_flags |= MS_RDONLY;
  72                         }
  73                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
  74                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  75         } else printk("\n");
  76         hpfs_sb(s)->sb_was_error = 1;
  77 }
  78
  79 /*
  80  * A little trick to detect cycles in many hpfs structures and don't let the
  81  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  82  *
  83  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  84  * nested each in other, chkdsk locked up happilly.
  85  */
  86
  87 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
  88                 char *msg)
  89 {
  90         if (*c2 && *c1 == key) {
  91                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
  92                 return 1;
  93         }
  94         (*c2)++;
  95         if (!((*c2 - 1) & *c2)) *c1 = key;
  96         return 0;
  97 }
  98
  99 static void hpfs_put_super(struct super_block *s)
 100 {
 101         struct hpfs_sb_info *sbi = hpfs_sb(s);
 102         kfree(sbi->sb_cp_table);
 103         kfree(sbi->sb_bmp_dir);
 104         unmark_dirty(s);
 105         s->s_fs_info = NULL;
 106         kfree(sbi);
 107 }
 108
 109 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 110 {
 111         struct quad_buffer_head qbh;
 112         unsigned *bits;
 113         unsigned i, count;
 114         if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
 115         count = 0;
 116         for (i = 0; i < 2048 / sizeof(unsigned); i++) {
 117                 unsigned b;
 118                 if (!bits[i]) continue;
 119                 for (b = bits[i]; b; b>>=1) count += b & 1;
 120         }
 121         hpfs_brelse4(&qbh);
 122         return count;
 123 }
 124
 125 static unsigned count_bitmaps(struct super_block *s)
 126 {
 127         unsigned n, count, n_bands;
 128         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 129         count = 0;
 130         for (n = 0; n < n_bands; n++)
 131                 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
 132         return count;
 133 }
 134
 135 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 136 {
 137         struct super_block *s = dentry->d_sb;
 138         struct hpfs_sb_info *sbi = hpfs_sb(s);
 139         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 140         lock_kernel();
 141
 142         /*if (sbi->sb_n_free == -1) {*/
 143                 sbi->sb_n_free = count_bitmaps(s);
 144                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 145         /*}*/
 146         buf->f_type = s->s_magic;
 147         buf->f_bsize = 512;
 148         buf->f_blocks = sbi->sb_fs_size;
 149         buf->f_bfree = sbi->sb_n_free;
 150         buf->f_bavail = sbi->sb_n_free;
 151         buf->f_files = sbi->sb_dirband_size / 4;
 152         buf->f_ffree = sbi->sb_n_free_dnodes;
 153         buf->f_fsid.val[0] = (u32)id;
 154         buf->f_fsid.val[1] = (u32)(id >> 32);
 155         buf->f_namelen = 254;
 156
 157         unlock_kernel();
 158
 159         return 0;
 160 }
 161
 162 static struct kmem_cache * hpfs_inode_cachep;
 163
 164 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 165 {
 166         struct hpfs_inode_info *ei;
 167         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 168         if (!ei)
 169                 return NULL;
 170         ei->vfs_inode.i_version = 1;
 171         return &ei->vfs_inode;
 172 }
 173
 174 static void hpfs_destroy_inode(struct inode *inode)
 175 {
 176         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 177 }
 178
 179 static void init_once(void *foo)
 180 {
 181         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 182
 183         mutex_init(&ei->i_mutex);
 184         mutex_init(&ei->i_parent_mutex);
 185         inode_init_once(&ei->vfs_inode);
 186 }
 187
 188 static int init_inodecache(void)
 189 {
 190         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 191                                              sizeof(struct hpfs_inode_info),
 192                                              0, (SLAB_RECLAIM_ACCOUNT|
 193                                                 SLAB_MEM_SPREAD),
 194                                              init_once);
 195         if (hpfs_inode_cachep == NULL)
 196                 return -ENOMEM;
 197         return 0;
 198 }
 199
 200 static void destroy_inodecache(void)
 201 {
 202         kmem_cache_destroy(hpfs_inode_cachep);
 203 }
 204
 205 /*
 206  * A tiny parser for option strings, stolen from dosfs.
 207  * Stolen again from read-only hpfs.
 208  * And updated for table-driven option parsing.
 209  */
 210
 211 enum {
 212         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 213         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
 214         Opt_check_none, Opt_check_normal, Opt_check_strict,
 215         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 216         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 217         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 218         Opt_timeshift, Opt_err,
 219 };
 220
 221 static const match_table_t tokens = {
 222         {Opt_help, "help"},
 223         {Opt_uid, "uid=%u"},
 224         {Opt_gid, "gid=%u"},
 225         {Opt_umask, "umask=%o"},
 226         {Opt_case_lower, "case=lower"},
 227         {Opt_case_asis, "case=asis"},
 228         {Opt_conv_binary, "conv=binary"},
 229         {Opt_conv_text, "conv=text"},
 230         {Opt_conv_auto, "conv=auto"},
 231         {Opt_check_none, "check=none"},
 232         {Opt_check_normal, "check=normal"},
 233         {Opt_check_strict, "check=strict"},
 234         {Opt_err_cont, "errors=continue"},
 235         {Opt_err_ro, "errors=remount-ro"},
 236         {Opt_err_panic, "errors=panic"},
 237         {Opt_eas_no, "eas=no"},
 238         {Opt_eas_ro, "eas=ro"},
 239         {Opt_eas_rw, "eas=rw"},
 240         {Opt_chkdsk_no, "chkdsk=no"},
 241         {Opt_chkdsk_errors, "chkdsk=errors"},
 242         {Opt_chkdsk_always, "chkdsk=always"},
 243         {Opt_timeshift, "timeshift=%d"},
 244         {Opt_err, NULL},
 245 };
 246
 247 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 248                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
 249                       int *chkdsk, int *timeshift)
 250 {
 251         char *p;
 252         int option;
 253
 254         if (!opts)
 255                 return 1;
 256
 257         /*printk("Parsing opts: '%s'\n",opts);*/
 258
 259         while ((p = strsep(&opts, ",")) != NULL) {
 260                 substring_t args[MAX_OPT_ARGS];
 261                 int token;
 262                 if (!*p)
 263                         continue;
 264
 265                 token = match_token(p, tokens, args);
 266                 switch (token) {
 267                 case Opt_help:
 268                         return 2;
 269                 case Opt_uid:
 270                         if (match_int(args, &option))
 271                                 return 0;
 272                         *uid = option;
 273                         break;
 274                 case Opt_gid:
 275                         if (match_int(args, &option))
 276                                 return 0;
 277                         *gid = option;
 278                         break;
 279                 case Opt_umask:
 280                         if (match_octal(args, &option))
 281                                 return 0;
 282                         *umask = option;
 283                         break;
 284                 case Opt_case_lower:
 285                         *lowercase = 1;
 286                         break;
 287                 case Opt_case_asis:
 288                         *lowercase = 0;
 289                         break;
 290                 case Opt_conv_binary:
 291                         *conv = CONV_BINARY;
 292                         break;
 293                 case Opt_conv_text:
 294                         *conv = CONV_TEXT;
 295                         break;
 296                 case Opt_conv_auto:
 297                         *conv = CONV_AUTO;
 298                         break;
 299                 case Opt_check_none:
 300                         *chk = 0;
 301                         break;
 302                 case Opt_check_normal:
 303                         *chk = 1;
 304                         break;
 305                 case Opt_check_strict:
 306                         *chk = 2;
 307                         break;
 308                 case Opt_err_cont:
 309                         *errs = 0;
 310                         break;
 311                 case Opt_err_ro:
 312                         *errs = 1;
 313                         break;
 314                 case Opt_err_panic:
 315                         *errs = 2;
 316                         break;
 317                 case Opt_eas_no:
 318                         *eas = 0;
 319                         break;
 320                 case Opt_eas_ro:
 321                         *eas = 1;
 322                         break;
 323                 case Opt_eas_rw:
 324                         *eas = 2;
 325                         break;
 326                 case Opt_chkdsk_no:
 327                         *chkdsk = 0;
 328                         break;
 329                 case Opt_chkdsk_errors:
 330                         *chkdsk = 1;
 331                         break;
 332                 case Opt_chkdsk_always:
 333                         *chkdsk = 2;
 334                         break;
 335                 case Opt_timeshift:
 336                 {
 337                         int m = 1;
 338                         char *rhs = args[0].from;
 339                         if (!rhs || !*rhs)
 340                                 return 0;
 341                         if (*rhs == '-') m = -1;
 342                         if (*rhs == '+' || *rhs == '-') rhs++;
 343                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 344                         if (*rhs)
 345                                 return 0;
 346                         break;
 347                 }
 348                 default:
 349                         return 0;
 350                 }
 351         }
 352         return 1;
 353 }
 354
 355 static inline void hpfs_help(void)
 356 {
 357         printk("\n\
 358 HPFS filesystem options:\n\
 359       help              do not mount and display this text\n\
 360       uid=xxx           set uid of files that don't have uid specified in eas\n\
 361       gid=xxx           set gid of files that don't have gid specified in eas\n\
 362       umask=xxx         set mode of files that don't have mode specified in eas\n\
 363       case=lower        lowercase all files\n\
 364       case=asis         do not lowercase files (default)\n\
 365       conv=binary       do not convert CR/LF -> LF (default)\n\
 366       conv=auto         convert only files with known text extensions\n\
 367       conv=text         convert all files\n\
 368       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 369       check=normal      do some checks - it should not crash (default)\n\
 370       check=strict      do extra time-consuming checks, used for debugging\n\
 371       errors=continue   continue on errors\n\
 372       errors=remount-ro remount read-only if errors found (default)\n\
 373       errors=panic      panic on errors\n\
 374       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 375       chkdsk=errors     mark fs dirty if errors found (default)\n\
 376       chkdsk=always     always mark fs dirty - used for debugging\n\
 377       eas=no            ignore extended attributes\n\
 378       eas=ro            read but do not write extended attributes\n\
 379       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 380       timeshift=nnn     add nnn seconds to file times\n\
 381 \n");
 382 }
 383
 384 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 385 {
 386         uid_t uid;
 387         gid_t gid;
 388         umode_t umask;
 389         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 390         int o;
 391         struct hpfs_sb_info *sbi = hpfs_sb(s);
 392         char *new_opts = kstrdup(data, GFP_KERNEL);
 393
 394         *flags |= MS_NOATIME;
 395
 396         uid = sbi->sb_uid; gid = sbi->sb_gid;
 397         umask = 0777 & ~sbi->sb_mode;
 398         lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
 399         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 400         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 401
 402         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
 403             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 404                 printk("HPFS: bad mount options.\n");
 405                 goto out_err;
 406         }
 407         if (o == 2) {
 408                 hpfs_help();
 409                 goto out_err;
 410         }
 411         if (timeshift != sbi->sb_timeshift) {
 412                 printk("HPFS: timeshift can't be changed using remount.\n");
 413                 goto out_err;
 414         }
 415
 416         unmark_dirty(s);
 417
 418         sbi->sb_uid = uid; sbi->sb_gid = gid;
 419         sbi->sb_mode = 0777 & ~umask;
 420         sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
 421         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 422         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 423
 424         if (!(*flags & MS_RDONLY)) mark_dirty(s);
 425
 426         kfree(s->s_options);
 427         s->s_options = new_opts;
 428
 429         return 0;
 430
 431 out_err:
 432         kfree(new_opts);
 433         return -EINVAL;
 434 }
 435
 436 /* Super operations */
 437
 438 static const struct super_operations hpfs_sops =
 439 {
 440         .alloc_inode    = hpfs_alloc_inode,
 441         .destroy_inode  = hpfs_destroy_inode,
 442         .delete_inode   = hpfs_delete_inode,
 443         .put_super      = hpfs_put_super,
 444         .statfs         = hpfs_statfs,
 445         .remount_fs     = hpfs_remount_fs,
 446         .show_options   = generic_show_options,
 447 };
 448
 449 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 450 {
 451         struct buffer_head *bh0, *bh1, *bh2;
 452         struct hpfs_boot_block *bootblock;
 453         struct hpfs_super_block *superblock;
 454         struct hpfs_spare_block *spareblock;
 455         struct hpfs_sb_info *sbi;
 456         struct inode *root;
 457
 458         uid_t uid;
 459         gid_t gid;
 460         umode_t umask;
 461         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 462
 463         dnode_secno root_dno;
 464         struct hpfs_dirent *de = NULL;
 465         struct quad_buffer_head qbh;
 466
 467         int o;
 468
 469         save_mount_options(s, options);
 470
 471         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 472         if (!sbi)
 473                 return -ENOMEM;
 474         s->s_fs_info = sbi;
 475
 476         sbi->sb_bmp_dir = NULL;
 477         sbi->sb_cp_table = NULL;
 478
 479         init_MUTEX(&sbi->hpfs_creation_de);
 480
 481         uid = current_uid();
 482         gid = current_gid();
 483         umask = current_umask();
 484         lowercase = 0;
 485         conv = CONV_BINARY;
 486         eas = 2;
 487         chk = 1;
 488         errs = 1;
 489         chkdsk = 1;
 490         timeshift = 0;
 491
 492         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
 493             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 494                 printk("HPFS: bad mount options.\n");
 495                 goto bail0;
 496         }
 497         if (o==2) {
 498                 hpfs_help();
 499                 goto bail0;
 500         }
 501
 502         /*sbi->sb_mounting = 1;*/
 503         sb_set_blocksize(s, 512);
 504         sbi->sb_fs_size = -1;
 505         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 506         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 507         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 508
 509         /* Check magics */
 510         if (/*bootblock->magic != BB_MAGIC
 511             ||*/ superblock->magic != SB_MAGIC
 512             || spareblock->magic != SP_MAGIC) {
 513                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
 514                 goto bail4;
 515         }
 516
 517         /* Check version */
 518         if (!(s->s_flags & MS_RDONLY) &&
 519               superblock->funcversion != 2 && superblock->funcversion != 3) {
 520                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
 521                         (int)superblock->version, (int)superblock->funcversion);
 522                 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");
 523                 goto bail4;
 524         }
 525
 526         s->s_flags |= MS_NOATIME;
 527
 528         /* Fill superblock stuff */
 529         s->s_magic = HPFS_SUPER_MAGIC;
 530         s->s_op = &hpfs_sops;
 531
 532         sbi->sb_root = superblock->root;
 533         sbi->sb_fs_size = superblock->n_sectors;
 534         sbi->sb_bitmaps = superblock->bitmaps;
 535         sbi->sb_dirband_start = superblock->dir_band_start;
 536         sbi->sb_dirband_size = superblock->n_dir_band;
 537         sbi->sb_dmap = superblock->dir_band_bitmap;
 538         sbi->sb_uid = uid;
 539         sbi->sb_gid = gid;
 540         sbi->sb_mode = 0777 & ~umask;
 541         sbi->sb_n_free = -1;
 542         sbi->sb_n_free_dnodes = -1;
 543         sbi->sb_lowercase = lowercase;
 544         sbi->sb_conv = conv;
 545         sbi->sb_eas = eas;
 546         sbi->sb_chk = chk;
 547         sbi->sb_chkdsk = chkdsk;
 548         sbi->sb_err = errs;
 549         sbi->sb_timeshift = timeshift;
 550         sbi->sb_was_error = 0;
 551         sbi->sb_cp_table = NULL;
 552         sbi->sb_c_bitmap = -1;
 553         sbi->sb_max_fwd_alloc = 0xffffff;
 554
 555         /* Load bitmap directory */
 556         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
 557                 goto bail4;
 558
 559         /* Check for general fs errors*/
 560         if (spareblock->dirty && !spareblock->old_wrote) {
 561                 if (errs == 2) {
 562                         printk("HPFS: Improperly stopped, not mounted\n");
 563                         goto bail4;
 564                 }
 565                 hpfs_error(s, "improperly stopped");
 566         }
 567
 568         if (!(s->s_flags & MS_RDONLY)) {
 569                 spareblock->dirty = 1;
 570                 spareblock->old_wrote = 0;
 571                 mark_buffer_dirty(bh2);
 572         }
 573
 574         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 575                 if (errs >= 2) {
 576                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 577                         mark_dirty(s);
 578                         goto bail4;
 579                 }
 580                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 581                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 582                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 583         }
 584         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
 585                 if (errs >= 2) {
 586                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 587                         mark_dirty(s);
 588                         goto bail4;
 589                 }
 590                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 591                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 592         }
 593         if (chk) {
 594                 unsigned a;
 595                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
 596                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
 597                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 598                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
 599                         goto bail4;
 600                 }
 601                 a = sbi->sb_dirband_size;
 602                 sbi->sb_dirband_size = 0;
 603                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
 604                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
 605                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
 606                         mark_dirty(s);
 607                         goto bail4;
 608                 }
 609                 sbi->sb_dirband_size = a;
 610         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 611
 612         /* Load code page table */
 613         if (spareblock->n_code_pages)
 614                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
 615                         printk("HPFS: Warning: code page support is disabled\n");
 616
 617         brelse(bh2);
 618         brelse(bh1);
 619         brelse(bh0);
 620
 621         root = iget_locked(s, sbi->sb_root);
 622         if (!root)
 623                 goto bail0;
 624         hpfs_init_inode(root);
 625         hpfs_read_inode(root);
 626         unlock_new_inode(root);
 627         s->s_root = d_alloc_root(root);
 628         if (!s->s_root) {
 629                 iput(root);
 630                 goto bail0;
 631         }
 632         hpfs_set_dentry_operations(s->s_root);
 633
 634         /*
 635          * find the root directory's . pointer & finish filling in the inode
 636          */
 637
 638         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 639         if (root_dno)
 640                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 641         if (!de)
 642                 hpfs_error(s, "unable to find root dir");
 643         else {
 644                 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
 645                 root->i_atime.tv_nsec = 0;
 646                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
 647                 root->i_mtime.tv_nsec = 0;
 648                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
 649                 root->i_ctime.tv_nsec = 0;
 650                 hpfs_i(root)->i_ea_size = de->ea_size;
 651                 hpfs_i(root)->i_parent_dir = root->i_ino;
 652                 if (root->i_size == -1)
 653                         root->i_size = 2048;
 654                 if (root->i_blocks == -1)
 655                         root->i_blocks = 5;
 656                 hpfs_brelse4(&qbh);
 657         }
 658         return 0;
 659
 660 bail4:  brelse(bh2);
 661 bail3:  brelse(bh1);
 662 bail2:  brelse(bh0);
 663 bail1:
 664 bail0:
 665         kfree(sbi->sb_bmp_dir);
 666         kfree(sbi->sb_cp_table);
 667         s->s_fs_info = NULL;
 668         kfree(sbi);
 669         return -EINVAL;
 670 }
 671
 672 static int hpfs_get_sb(struct file_system_type *fs_type,
 673         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 674 {
 675         return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
 676                            mnt);
 677 }
 678
 679 static struct file_system_type hpfs_fs_type = {
 680         .owner          = THIS_MODULE,
 681         .name           = "hpfs",
 682         .get_sb         = hpfs_get_sb,
 683         .kill_sb        = kill_block_super,
 684         .fs_flags       = FS_REQUIRES_DEV,
 685 };
 686
 687 static int __init init_hpfs_fs(void)
 688 {
 689         int err = init_inodecache();
 690         if (err)
 691                 goto out1;
 692         err = register_filesystem(&hpfs_fs_type);
 693         if (err)
 694                 goto out;
 695         return 0;
 696 out:
 697         destroy_inodecache();
 698 out1:
 699         return err;
 700 }
 701
 702 static void __exit exit_hpfs_fs(void)
 703 {
 704         unregister_filesystem(&hpfs_fs_type);
 705         destroy_inodecache();
 706 }
 707
 708 module_init(init_hpfs_fs)
 709 module_exit(exit_hpfs_fs)
 710 MODULE_LICENSE("GPL");