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/smp_lock.h>
  17 #include <linux/bitmap.h>
  18 #include <linux/slab.h>
  19
  20 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
  21
  22 static void mark_dirty(struct super_block *s)
  23 {
  24         if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
  25                 struct buffer_head *bh;
  26                 struct hpfs_spare_block *sb;
  27                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  28                         sb->dirty = 1;
  29                         sb->old_wrote = 0;
  30                         mark_buffer_dirty(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         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  45                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
  46                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
  47                 mark_buffer_dirty(bh);
  48                 brelse(bh);
  49         }
  50 }
  51
  52 /* Filesystem error... */
  53 static char err_buf[1024];
  54
  55 void hpfs_error(struct super_block *s, const char *fmt, ...)
  56 {
  57         va_list args;
  58
  59         va_start(args, fmt);
  60         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
  61         va_end(args);
  62
  63         printk("HPFS: filesystem error: %s", err_buf);
  64         if (!hpfs_sb(s)->sb_was_error) {
  65                 if (hpfs_sb(s)->sb_err == 2) {
  66                         printk("; crashing the system because you wanted it\n");
  67                         mark_dirty(s);
  68                         panic("HPFS panic");
  69                 } else if (hpfs_sb(s)->sb_err == 1) {
  70                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
  71                         else {
  72                                 printk("; remounting read-only\n");
  73                                 mark_dirty(s);
  74                                 s->s_flags |= MS_RDONLY;
  75                         }
  76                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
  77                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  78         } else printk("\n");
  79         hpfs_sb(s)->sb_was_error = 1;
  80 }
  81
  82 /*
  83  * A little trick to detect cycles in many hpfs structures and don't let the
  84  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  85  *
  86  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  87  * nested each in other, chkdsk locked up happilly.
  88  */
  89
  90 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
  91                 char *msg)
  92 {
  93         if (*c2 && *c1 == key) {
  94                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
  95                 return 1;
  96         }
  97         (*c2)++;
  98         if (!((*c2 - 1) & *c2)) *c1 = key;
  99         return 0;
 100 }
 101
 102 static void hpfs_put_super(struct super_block *s)
 103 {
 104         struct hpfs_sb_info *sbi = hpfs_sb(s);
 105
 106         lock_kernel();
 107
 108         kfree(sbi->sb_cp_table);
 109         kfree(sbi->sb_bmp_dir);
 110         unmark_dirty(s);
 111         s->s_fs_info = NULL;
 112         kfree(sbi);
 113
 114         unlock_kernel();
 115 }
 116
 117 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 118 {
 119         struct quad_buffer_head qbh;
 120         unsigned long *bits;
 121         unsigned count;
 122
 123         bits = hpfs_map_4sectors(s, secno, &qbh, 4);
 124         if (!bits)
 125                 return 0;
 126         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 127         hpfs_brelse4(&qbh);
 128         return count;
 129 }
 130
 131 static unsigned count_bitmaps(struct super_block *s)
 132 {
 133         unsigned n, count, n_bands;
 134         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 135         count = 0;
 136         for (n = 0; n < n_bands; n++)
 137                 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
 138         return count;
 139 }
 140
 141 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 142 {
 143         struct super_block *s = dentry->d_sb;
 144         struct hpfs_sb_info *sbi = hpfs_sb(s);
 145         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 146         lock_kernel();
 147
 148         /*if (sbi->sb_n_free == -1) {*/
 149                 sbi->sb_n_free = count_bitmaps(s);
 150                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 151         /*}*/
 152         buf->f_type = s->s_magic;
 153         buf->f_bsize = 512;
 154         buf->f_blocks = sbi->sb_fs_size;
 155         buf->f_bfree = sbi->sb_n_free;
 156         buf->f_bavail = sbi->sb_n_free;
 157         buf->f_files = sbi->sb_dirband_size / 4;
 158         buf->f_ffree = sbi->sb_n_free_dnodes;
 159         buf->f_fsid.val[0] = (u32)id;
 160         buf->f_fsid.val[1] = (u32)(id >> 32);
 161         buf->f_namelen = 254;
 162
 163         unlock_kernel();
 164
 165         return 0;
 166 }
 167
 168 static struct kmem_cache * hpfs_inode_cachep;
 169
 170 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 171 {
 172         struct hpfs_inode_info *ei;
 173         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 174         if (!ei)
 175                 return NULL;
 176         ei->vfs_inode.i_version = 1;
 177         return &ei->vfs_inode;
 178 }
 179
 180 static void hpfs_destroy_inode(struct inode *inode)
 181 {
 182         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 183 }
 184
 185 static void init_once(void *foo)
 186 {
 187         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 188
 189         mutex_init(&ei->i_mutex);
 190         mutex_init(&ei->i_parent_mutex);
 191         inode_init_once(&ei->vfs_inode);
 192 }
 193
 194 static int init_inodecache(void)
 195 {
 196         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 197                                              sizeof(struct hpfs_inode_info),
 198                                              0, (SLAB_RECLAIM_ACCOUNT|
 199                                                 SLAB_MEM_SPREAD),
 200                                              init_once);
 201         if (hpfs_inode_cachep == NULL)
 202                 return -ENOMEM;
 203         return 0;
 204 }
 205
 206 static void destroy_inodecache(void)
 207 {
 208         kmem_cache_destroy(hpfs_inode_cachep);
 209 }
 210
 211 /*
 212  * A tiny parser for option strings, stolen from dosfs.
 213  * Stolen again from read-only hpfs.
 214  * And updated for table-driven option parsing.
 215  */
 216
 217 enum {
 218         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 219         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
 220         Opt_check_none, Opt_check_normal, Opt_check_strict,
 221         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 222         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 223         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 224         Opt_timeshift, Opt_err,
 225 };
 226
 227 static const match_table_t tokens = {
 228         {Opt_help, "help"},
 229         {Opt_uid, "uid=%u"},
 230         {Opt_gid, "gid=%u"},
 231         {Opt_umask, "umask=%o"},
 232         {Opt_case_lower, "case=lower"},
 233         {Opt_case_asis, "case=asis"},
 234         {Opt_conv_binary, "conv=binary"},
 235         {Opt_conv_text, "conv=text"},
 236         {Opt_conv_auto, "conv=auto"},
 237         {Opt_check_none, "check=none"},
 238         {Opt_check_normal, "check=normal"},
 239         {Opt_check_strict, "check=strict"},
 240         {Opt_err_cont, "errors=continue"},
 241         {Opt_err_ro, "errors=remount-ro"},
 242         {Opt_err_panic, "errors=panic"},
 243         {Opt_eas_no, "eas=no"},
 244         {Opt_eas_ro, "eas=ro"},
 245         {Opt_eas_rw, "eas=rw"},
 246         {Opt_chkdsk_no, "chkdsk=no"},
 247         {Opt_chkdsk_errors, "chkdsk=errors"},
 248         {Opt_chkdsk_always, "chkdsk=always"},
 249         {Opt_timeshift, "timeshift=%d"},
 250         {Opt_err, NULL},
 251 };
 252
 253 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 254                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
 255                       int *chkdsk, int *timeshift)
 256 {
 257         char *p;
 258         int option;
 259
 260         if (!opts)
 261                 return 1;
 262
 263         /*printk("Parsing opts: '%s'\n",opts);*/
 264
 265         while ((p = strsep(&opts, ",")) != NULL) {
 266                 substring_t args[MAX_OPT_ARGS];
 267                 int token;
 268                 if (!*p)
 269                         continue;
 270
 271                 token = match_token(p, tokens, args);
 272                 switch (token) {
 273                 case Opt_help:
 274                         return 2;
 275                 case Opt_uid:
 276                         if (match_int(args, &option))
 277                                 return 0;
 278                         *uid = option;
 279                         break;
 280                 case Opt_gid:
 281                         if (match_int(args, &option))
 282                                 return 0;
 283                         *gid = option;
 284                         break;
 285                 case Opt_umask:
 286                         if (match_octal(args, &option))
 287                                 return 0;
 288                         *umask = option;
 289                         break;
 290                 case Opt_case_lower:
 291                         *lowercase = 1;
 292                         break;
 293                 case Opt_case_asis:
 294                         *lowercase = 0;
 295                         break;
 296                 case Opt_conv_binary:
 297                         *conv = CONV_BINARY;
 298                         break;
 299                 case Opt_conv_text:
 300                         *conv = CONV_TEXT;
 301                         break;
 302                 case Opt_conv_auto:
 303                         *conv = CONV_AUTO;
 304                         break;
 305                 case Opt_check_none:
 306                         *chk = 0;
 307                         break;
 308                 case Opt_check_normal:
 309                         *chk = 1;
 310                         break;
 311                 case Opt_check_strict:
 312                         *chk = 2;
 313                         break;
 314                 case Opt_err_cont:
 315                         *errs = 0;
 316                         break;
 317                 case Opt_err_ro:
 318                         *errs = 1;
 319                         break;
 320                 case Opt_err_panic:
 321                         *errs = 2;
 322                         break;
 323                 case Opt_eas_no:
 324                         *eas = 0;
 325                         break;
 326                 case Opt_eas_ro:
 327                         *eas = 1;
 328                         break;
 329                 case Opt_eas_rw:
 330                         *eas = 2;
 331                         break;
 332                 case Opt_chkdsk_no:
 333                         *chkdsk = 0;
 334                         break;
 335                 case Opt_chkdsk_errors:
 336                         *chkdsk = 1;
 337                         break;
 338                 case Opt_chkdsk_always:
 339                         *chkdsk = 2;
 340                         break;
 341                 case Opt_timeshift:
 342                 {
 343                         int m = 1;
 344                         char *rhs = args[0].from;
 345                         if (!rhs || !*rhs)
 346                                 return 0;
 347                         if (*rhs == '-') m = -1;
 348                         if (*rhs == '+' || *rhs == '-') rhs++;
 349                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 350                         if (*rhs)
 351                                 return 0;
 352                         break;
 353                 }
 354                 default:
 355                         return 0;
 356                 }
 357         }
 358         return 1;
 359 }
 360
 361 static inline void hpfs_help(void)
 362 {
 363         printk("\n\
 364 HPFS filesystem options:\n\
 365       help              do not mount and display this text\n\
 366       uid=xxx           set uid of files that don't have uid specified in eas\n\
 367       gid=xxx           set gid of files that don't have gid specified in eas\n\
 368       umask=xxx         set mode of files that don't have mode specified in eas\n\
 369       case=lower        lowercase all files\n\
 370       case=asis         do not lowercase files (default)\n\
 371       conv=binary       do not convert CR/LF -> LF (default)\n\
 372       conv=auto         convert only files with known text extensions\n\
 373       conv=text         convert all files\n\
 374       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 375       check=normal      do some checks - it should not crash (default)\n\
 376       check=strict      do extra time-consuming checks, used for debugging\n\
 377       errors=continue   continue on errors\n\
 378       errors=remount-ro remount read-only if errors found (default)\n\
 379       errors=panic      panic on errors\n\
 380       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 381       chkdsk=errors     mark fs dirty if errors found (default)\n\
 382       chkdsk=always     always mark fs dirty - used for debugging\n\
 383       eas=no            ignore extended attributes\n\
 384       eas=ro            read but do not write extended attributes\n\
 385       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 386       timeshift=nnn     add nnn seconds to file times\n\
 387 \n");
 388 }
 389
 390 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 391 {
 392         uid_t uid;
 393         gid_t gid;
 394         umode_t umask;
 395         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 396         int o;
 397         struct hpfs_sb_info *sbi = hpfs_sb(s);
 398         char *new_opts = kstrdup(data, GFP_KERNEL);
 399
 400         *flags |= MS_NOATIME;
 401
 402         lock_kernel();
 403         lock_super(s);
 404         uid = sbi->sb_uid; gid = sbi->sb_gid;
 405         umask = 0777 & ~sbi->sb_mode;
 406         lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
 407         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 408         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 409
 410         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
 411             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 412                 printk("HPFS: bad mount options.\n");
 413                 goto out_err;
 414         }
 415         if (o == 2) {
 416                 hpfs_help();
 417                 goto out_err;
 418         }
 419         if (timeshift != sbi->sb_timeshift) {
 420                 printk("HPFS: timeshift can't be changed using remount.\n");
 421                 goto out_err;
 422         }
 423
 424         unmark_dirty(s);
 425
 426         sbi->sb_uid = uid; sbi->sb_gid = gid;
 427         sbi->sb_mode = 0777 & ~umask;
 428         sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
 429         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 430         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 431
 432         if (!(*flags & MS_RDONLY)) mark_dirty(s);
 433
 434         replace_mount_options(s, new_opts);
 435
 436         unlock_super(s);
 437         unlock_kernel();
 438         return 0;
 439
 440 out_err:
 441         unlock_super(s);
 442         unlock_kernel();
 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         uid_t uid;
 470         gid_t gid;
 471         umode_t umask;
 472         int lowercase, conv, 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         lock_kernel();
 481
 482         save_mount_options(s, options);
 483
 484         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 485         if (!sbi) {
 486                 unlock_kernel();
 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         init_MUTEX(&sbi->hpfs_creation_de);
 495
 496         uid = current_uid();
 497         gid = current_gid();
 498         umask = current_umask();
 499         lowercase = 0;
 500         conv = CONV_BINARY;
 501         eas = 2;
 502         chk = 1;
 503         errs = 1;
 504         chkdsk = 1;
 505         timeshift = 0;
 506
 507         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
 508             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 509                 printk("HPFS: bad mount options.\n");
 510                 goto bail0;
 511         }
 512         if (o==2) {
 513                 hpfs_help();
 514                 goto bail0;
 515         }
 516
 517         /*sbi->sb_mounting = 1;*/
 518         sb_set_blocksize(s, 512);
 519         sbi->sb_fs_size = -1;
 520         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 521         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 522         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 523
 524         /* Check magics */
 525         if (/*bootblock->magic != BB_MAGIC
 526             ||*/ superblock->magic != SB_MAGIC
 527             || spareblock->magic != SP_MAGIC) {
 528                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
 529                 goto bail4;
 530         }
 531
 532         /* Check version */
 533         if (!(s->s_flags & MS_RDONLY) &&
 534               superblock->funcversion != 2 && superblock->funcversion != 3) {
 535                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
 536                         (int)superblock->version, (int)superblock->funcversion);
 537                 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");
 538                 goto bail4;
 539         }
 540
 541         s->s_flags |= MS_NOATIME;
 542
 543         /* Fill superblock stuff */
 544         s->s_magic = HPFS_SUPER_MAGIC;
 545         s->s_op = &hpfs_sops;
 546
 547         sbi->sb_root = superblock->root;
 548         sbi->sb_fs_size = superblock->n_sectors;
 549         sbi->sb_bitmaps = superblock->bitmaps;
 550         sbi->sb_dirband_start = superblock->dir_band_start;
 551         sbi->sb_dirband_size = superblock->n_dir_band;
 552         sbi->sb_dmap = superblock->dir_band_bitmap;
 553         sbi->sb_uid = uid;
 554         sbi->sb_gid = gid;
 555         sbi->sb_mode = 0777 & ~umask;
 556         sbi->sb_n_free = -1;
 557         sbi->sb_n_free_dnodes = -1;
 558         sbi->sb_lowercase = lowercase;
 559         sbi->sb_conv = conv;
 560         sbi->sb_eas = eas;
 561         sbi->sb_chk = chk;
 562         sbi->sb_chkdsk = chkdsk;
 563         sbi->sb_err = errs;
 564         sbi->sb_timeshift = timeshift;
 565         sbi->sb_was_error = 0;
 566         sbi->sb_cp_table = NULL;
 567         sbi->sb_c_bitmap = -1;
 568         sbi->sb_max_fwd_alloc = 0xffffff;
 569
 570         /* Load bitmap directory */
 571         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
 572                 goto bail4;
 573
 574         /* Check for general fs errors*/
 575         if (spareblock->dirty && !spareblock->old_wrote) {
 576                 if (errs == 2) {
 577                         printk("HPFS: Improperly stopped, not mounted\n");
 578                         goto bail4;
 579                 }
 580                 hpfs_error(s, "improperly stopped");
 581         }
 582
 583         if (!(s->s_flags & MS_RDONLY)) {
 584                 spareblock->dirty = 1;
 585                 spareblock->old_wrote = 0;
 586                 mark_buffer_dirty(bh2);
 587         }
 588
 589         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 590                 if (errs >= 2) {
 591                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 592                         mark_dirty(s);
 593                         goto bail4;
 594                 }
 595                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 596                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 597                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 598         }
 599         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
 600                 if (errs >= 2) {
 601                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 602                         mark_dirty(s);
 603                         goto bail4;
 604                 }
 605                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 606                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 607         }
 608         if (chk) {
 609                 unsigned a;
 610                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
 611                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
 612                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 613                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
 614                         goto bail4;
 615                 }
 616                 a = sbi->sb_dirband_size;
 617                 sbi->sb_dirband_size = 0;
 618                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
 619                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
 620                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
 621                         mark_dirty(s);
 622                         goto bail4;
 623                 }
 624                 sbi->sb_dirband_size = a;
 625         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 626
 627         /* Load code page table */
 628         if (spareblock->n_code_pages)
 629                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
 630                         printk("HPFS: Warning: code page support is disabled\n");
 631
 632         brelse(bh2);
 633         brelse(bh1);
 634         brelse(bh0);
 635
 636         root = iget_locked(s, sbi->sb_root);
 637         if (!root)
 638                 goto bail0;
 639         hpfs_init_inode(root);
 640         hpfs_read_inode(root);
 641         unlock_new_inode(root);
 642         s->s_root = d_alloc_root(root);
 643         if (!s->s_root) {
 644                 iput(root);
 645                 goto bail0;
 646         }
 647         hpfs_set_dentry_operations(s->s_root);
 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, de->read_date);
 660                 root->i_atime.tv_nsec = 0;
 661                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
 662                 root->i_mtime.tv_nsec = 0;
 663                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
 664                 root->i_ctime.tv_nsec = 0;
 665                 hpfs_i(root)->i_ea_size = 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         unlock_kernel();
 674         return 0;
 675
 676 bail4:  brelse(bh2);
 677 bail3:  brelse(bh1);
 678 bail2:  brelse(bh0);
 679 bail1:
 680 bail0:
 681         kfree(sbi->sb_bmp_dir);
 682         kfree(sbi->sb_cp_table);
 683         s->s_fs_info = NULL;
 684         kfree(sbi);
 685         unlock_kernel();
 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
 703 static int __init init_hpfs_fs(void)
 704 {
 705         int err = init_inodecache();
 706         if (err)
 707                 goto out1;
 708         err = register_filesystem(&hpfs_fs_type);
 709         if (err)
 710                 goto out;
 711         return 0;
 712 out:
 713         destroy_inodecache();
 714 out1:
 715         return err;
 716 }
 717
 718 static void __exit exit_hpfs_fs(void)
 719 {
 720         unregister_filesystem(&hpfs_fs_type);
 721         destroy_inodecache();
 722 }
 723
 724 module_init(init_hpfs_fs)
 725 module_exit(exit_hpfs_fs)
 726 MODULE_LICENSE("GPL");