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 static char err_buf[1024];
  56
  57 void hpfs_error(struct super_block *s, const char *fmt, ...)
  58 {
  59         va_list args;
  60
  61         va_start(args, fmt);
  62         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
  63         va_end(args);
  64
  65         printk("HPFS: filesystem error: %s", err_buf);
  66         if (!hpfs_sb(s)->sb_was_error) {
  67                 if (hpfs_sb(s)->sb_err == 2) {
  68                         printk("; crashing the system because you wanted it\n");
  69                         mark_dirty(s, 0);
  70                         panic("HPFS panic");
  71                 } else if (hpfs_sb(s)->sb_err == 1) {
  72                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
  73                         else {
  74                                 printk("; remounting read-only\n");
  75                                 mark_dirty(s, 0);
  76                                 s->s_flags |= MS_RDONLY;
  77                         }
  78                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
  79                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  80         } else printk("\n");
  81         hpfs_sb(s)->sb_was_error = 1;
  82 }
  83
  84 /*
  85  * A little trick to detect cycles in many hpfs structures and don't let the
  86  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  87  *
  88  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  89  * nested each in other, chkdsk locked up happilly.
  90  */
  91
  92 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
  93                 char *msg)
  94 {
  95         if (*c2 && *c1 == key) {
  96                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
  97                 return 1;
  98         }
  99         (*c2)++;
 100         if (!((*c2 - 1) & *c2)) *c1 = key;
 101         return 0;
 102 }
 103
 104 static void hpfs_put_super(struct super_block *s)
 105 {
 106         struct hpfs_sb_info *sbi = hpfs_sb(s);
 107
 108         hpfs_lock(s);
 109         unmark_dirty(s);
 110         hpfs_unlock(s);
 111
 112         kfree(sbi->sb_cp_table);
 113         kfree(sbi->sb_bmp_dir);
 114         s->s_fs_info = NULL;
 115         kfree(sbi);
 116 }
 117
 118 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 119 {
 120         struct quad_buffer_head qbh;
 121         unsigned long *bits;
 122         unsigned count;
 123
 124         bits = hpfs_map_4sectors(s, secno, &qbh, 4);
 125         if (!bits)
 126                 return 0;
 127         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 128         hpfs_brelse4(&qbh);
 129         return count;
 130 }
 131
 132 static unsigned count_bitmaps(struct super_block *s)
 133 {
 134         unsigned n, count, n_bands;
 135         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 136         count = 0;
 137         for (n = 0; n < n_bands; n++)
 138                 count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
 139         return count;
 140 }
 141
 142 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 143 {
 144         struct super_block *s = dentry->d_sb;
 145         struct hpfs_sb_info *sbi = hpfs_sb(s);
 146         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 147         hpfs_lock(s);
 148
 149         /*if (sbi->sb_n_free == -1) {*/
 150                 sbi->sb_n_free = count_bitmaps(s);
 151                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 152         /*}*/
 153         buf->f_type = s->s_magic;
 154         buf->f_bsize = 512;
 155         buf->f_blocks = sbi->sb_fs_size;
 156         buf->f_bfree = sbi->sb_n_free;
 157         buf->f_bavail = sbi->sb_n_free;
 158         buf->f_files = sbi->sb_dirband_size / 4;
 159         buf->f_ffree = sbi->sb_n_free_dnodes;
 160         buf->f_fsid.val[0] = (u32)id;
 161         buf->f_fsid.val[1] = (u32)(id >> 32);
 162         buf->f_namelen = 254;
 163
 164         hpfs_unlock(s);
 165
 166         return 0;
 167 }
 168
 169 static struct kmem_cache * hpfs_inode_cachep;
 170
 171 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 172 {
 173         struct hpfs_inode_info *ei;
 174         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 175         if (!ei)
 176                 return NULL;
 177         ei->vfs_inode.i_version = 1;
 178         return &ei->vfs_inode;
 179 }
 180
 181 static void hpfs_i_callback(struct rcu_head *head)
 182 {
 183         struct inode *inode = container_of(head, struct inode, i_rcu);
 184         INIT_LIST_HEAD(&inode->i_dentry);
 185         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 186 }
 187
 188 static void hpfs_destroy_inode(struct inode *inode)
 189 {
 190         call_rcu(&inode->i_rcu, hpfs_i_callback);
 191 }
 192
 193 static void init_once(void *foo)
 194 {
 195         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 196
 197         inode_init_once(&ei->vfs_inode);
 198 }
 199
 200 static int init_inodecache(void)
 201 {
 202         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 203                                              sizeof(struct hpfs_inode_info),
 204                                              0, (SLAB_RECLAIM_ACCOUNT|
 205                                                 SLAB_MEM_SPREAD),
 206                                              init_once);
 207         if (hpfs_inode_cachep == NULL)
 208                 return -ENOMEM;
 209         return 0;
 210 }
 211
 212 static void destroy_inodecache(void)
 213 {
 214         kmem_cache_destroy(hpfs_inode_cachep);
 215 }
 216
 217 /*
 218  * A tiny parser for option strings, stolen from dosfs.
 219  * Stolen again from read-only hpfs.
 220  * And updated for table-driven option parsing.
 221  */
 222
 223 enum {
 224         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 225         Opt_check_none, Opt_check_normal, Opt_check_strict,
 226         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 227         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 228         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 229         Opt_timeshift, Opt_err,
 230 };
 231
 232 static const match_table_t tokens = {
 233         {Opt_help, "help"},
 234         {Opt_uid, "uid=%u"},
 235         {Opt_gid, "gid=%u"},
 236         {Opt_umask, "umask=%o"},
 237         {Opt_case_lower, "case=lower"},
 238         {Opt_case_asis, "case=asis"},
 239         {Opt_check_none, "check=none"},
 240         {Opt_check_normal, "check=normal"},
 241         {Opt_check_strict, "check=strict"},
 242         {Opt_err_cont, "errors=continue"},
 243         {Opt_err_ro, "errors=remount-ro"},
 244         {Opt_err_panic, "errors=panic"},
 245         {Opt_eas_no, "eas=no"},
 246         {Opt_eas_ro, "eas=ro"},
 247         {Opt_eas_rw, "eas=rw"},
 248         {Opt_chkdsk_no, "chkdsk=no"},
 249         {Opt_chkdsk_errors, "chkdsk=errors"},
 250         {Opt_chkdsk_always, "chkdsk=always"},
 251         {Opt_timeshift, "timeshift=%d"},
 252         {Opt_err, NULL},
 253 };
 254
 255 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 256                       int *lowercase, int *eas, int *chk, int *errs,
 257                       int *chkdsk, int *timeshift)
 258 {
 259         char *p;
 260         int option;
 261
 262         if (!opts)
 263                 return 1;
 264
 265         /*printk("Parsing opts: '%s'\n",opts);*/
 266
 267         while ((p = strsep(&opts, ",")) != NULL) {
 268                 substring_t args[MAX_OPT_ARGS];
 269                 int token;
 270                 if (!*p)
 271                         continue;
 272
 273                 token = match_token(p, tokens, args);
 274                 switch (token) {
 275                 case Opt_help:
 276                         return 2;
 277                 case Opt_uid:
 278                         if (match_int(args, &option))
 279                                 return 0;
 280                         *uid = option;
 281                         break;
 282                 case Opt_gid:
 283                         if (match_int(args, &option))
 284                                 return 0;
 285                         *gid = option;
 286                         break;
 287                 case Opt_umask:
 288                         if (match_octal(args, &option))
 289                                 return 0;
 290                         *umask = option;
 291                         break;
 292                 case Opt_case_lower:
 293                         *lowercase = 1;
 294                         break;
 295                 case Opt_case_asis:
 296                         *lowercase = 0;
 297                         break;
 298                 case Opt_check_none:
 299                         *chk = 0;
 300                         break;
 301                 case Opt_check_normal:
 302                         *chk = 1;
 303                         break;
 304                 case Opt_check_strict:
 305                         *chk = 2;
 306                         break;
 307                 case Opt_err_cont:
 308                         *errs = 0;
 309                         break;
 310                 case Opt_err_ro:
 311                         *errs = 1;
 312                         break;
 313                 case Opt_err_panic:
 314                         *errs = 2;
 315                         break;
 316                 case Opt_eas_no:
 317                         *eas = 0;
 318                         break;
 319                 case Opt_eas_ro:
 320                         *eas = 1;
 321                         break;
 322                 case Opt_eas_rw:
 323                         *eas = 2;
 324                         break;
 325                 case Opt_chkdsk_no:
 326                         *chkdsk = 0;
 327                         break;
 328                 case Opt_chkdsk_errors:
 329                         *chkdsk = 1;
 330                         break;
 331                 case Opt_chkdsk_always:
 332                         *chkdsk = 2;
 333                         break;
 334                 case Opt_timeshift:
 335                 {
 336                         int m = 1;
 337                         char *rhs = args[0].from;
 338                         if (!rhs || !*rhs)
 339                                 return 0;
 340                         if (*rhs == '-') m = -1;
 341                         if (*rhs == '+' || *rhs == '-') rhs++;
 342                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 343                         if (*rhs)
 344                                 return 0;
 345                         break;
 346                 }
 347                 default:
 348                         return 0;
 349                 }
 350         }
 351         return 1;
 352 }
 353
 354 static inline void hpfs_help(void)
 355 {
 356         printk("\n\
 357 HPFS filesystem options:\n\
 358       help              do not mount and display this text\n\
 359       uid=xxx           set uid of files that don't have uid specified in eas\n\
 360       gid=xxx           set gid of files that don't have gid specified in eas\n\
 361       umask=xxx         set mode of files that don't have mode specified in eas\n\
 362       case=lower        lowercase all files\n\
 363       case=asis         do not lowercase files (default)\n\
 364       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 365       check=normal      do some checks - it should not crash (default)\n\
 366       check=strict      do extra time-consuming checks, used for debugging\n\
 367       errors=continue   continue on errors\n\
 368       errors=remount-ro remount read-only if errors found (default)\n\
 369       errors=panic      panic on errors\n\
 370       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 371       chkdsk=errors     mark fs dirty if errors found (default)\n\
 372       chkdsk=always     always mark fs dirty - used for debugging\n\
 373       eas=no            ignore extended attributes\n\
 374       eas=ro            read but do not write extended attributes\n\
 375       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 376       timeshift=nnn     add nnn seconds to file times\n\
 377 \n");
 378 }
 379
 380 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 381 {
 382         uid_t uid;
 383         gid_t gid;
 384         umode_t umask;
 385         int lowercase, eas, chk, errs, chkdsk, timeshift;
 386         int o;
 387         struct hpfs_sb_info *sbi = hpfs_sb(s);
 388         char *new_opts = kstrdup(data, GFP_KERNEL);
 389
 390         *flags |= MS_NOATIME;
 391
 392         hpfs_lock(s);
 393         lock_super(s);
 394         uid = sbi->sb_uid; gid = sbi->sb_gid;
 395         umask = 0777 & ~sbi->sb_mode;
 396         lowercase = sbi->sb_lowercase;
 397         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 398         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 399
 400         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 401             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 402                 printk("HPFS: bad mount options.\n");
 403                 goto out_err;
 404         }
 405         if (o == 2) {
 406                 hpfs_help();
 407                 goto out_err;
 408         }
 409         if (timeshift != sbi->sb_timeshift) {
 410                 printk("HPFS: timeshift can't be changed using remount.\n");
 411                 goto out_err;
 412         }
 413
 414         unmark_dirty(s);
 415
 416         sbi->sb_uid = uid; sbi->sb_gid = gid;
 417         sbi->sb_mode = 0777 & ~umask;
 418         sbi->sb_lowercase = lowercase;
 419         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 420         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 421
 422         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
 423
 424         replace_mount_options(s, new_opts);
 425
 426         unlock_super(s);
 427         hpfs_unlock(s);
 428         return 0;
 429
 430 out_err:
 431         unlock_super(s);
 432         hpfs_unlock(s);
 433         kfree(new_opts);
 434         return -EINVAL;
 435 }
 436
 437 /* Super operations */
 438
 439 static const struct super_operations hpfs_sops =
 440 {
 441         .alloc_inode    = hpfs_alloc_inode,
 442         .destroy_inode  = hpfs_destroy_inode,
 443         .evict_inode    = hpfs_evict_inode,
 444         .put_super      = hpfs_put_super,
 445         .statfs         = hpfs_statfs,
 446         .remount_fs     = hpfs_remount_fs,
 447         .show_options   = generic_show_options,
 448 };
 449
 450 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 451 {
 452         struct buffer_head *bh0, *bh1, *bh2;
 453         struct hpfs_boot_block *bootblock;
 454         struct hpfs_super_block *superblock;
 455         struct hpfs_spare_block *spareblock;
 456         struct hpfs_sb_info *sbi;
 457         struct inode *root;
 458
 459         uid_t uid;
 460         gid_t gid;
 461         umode_t umask;
 462         int lowercase, eas, chk, errs, chkdsk, timeshift;
 463
 464         dnode_secno root_dno;
 465         struct hpfs_dirent *de = NULL;
 466         struct quad_buffer_head qbh;
 467
 468         int o;
 469
 470         save_mount_options(s, options);
 471
 472         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 473         if (!sbi) {
 474                 return -ENOMEM;
 475         }
 476         s->s_fs_info = sbi;
 477
 478         sbi->sb_bmp_dir = NULL;
 479         sbi->sb_cp_table = NULL;
 480
 481         mutex_init(&sbi->hpfs_mutex);
 482         hpfs_lock(s);
 483
 484         uid = current_uid();
 485         gid = current_gid();
 486         umask = current_umask();
 487         lowercase = 0;
 488         eas = 2;
 489         chk = 1;
 490         errs = 1;
 491         chkdsk = 1;
 492         timeshift = 0;
 493
 494         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 495             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 496                 printk("HPFS: bad mount options.\n");
 497                 goto bail0;
 498         }
 499         if (o==2) {
 500                 hpfs_help();
 501                 goto bail0;
 502         }
 503
 504         /*sbi->sb_mounting = 1;*/
 505         sb_set_blocksize(s, 512);
 506         sbi->sb_fs_size = -1;
 507         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 508         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 509         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 510
 511         /* Check magics */
 512         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 513             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 514             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 515                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
 516                 goto bail4;
 517         }
 518
 519         /* Check version */
 520         if (!(s->s_flags & MS_RDONLY) &&
 521               superblock->funcversion != 2 && superblock->funcversion != 3) {
 522                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
 523                         (int)superblock->version, (int)superblock->funcversion);
 524                 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");
 525                 goto bail4;
 526         }
 527
 528         s->s_flags |= MS_NOATIME;
 529
 530         /* Fill superblock stuff */
 531         s->s_magic = HPFS_SUPER_MAGIC;
 532         s->s_op = &hpfs_sops;
 533         s->s_d_op = &hpfs_dentry_operations;
 534
 535         sbi->sb_root = le32_to_cpu(superblock->root);
 536         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 537         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 538         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 539         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 540         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 541         sbi->sb_uid = uid;
 542         sbi->sb_gid = gid;
 543         sbi->sb_mode = 0777 & ~umask;
 544         sbi->sb_n_free = -1;
 545         sbi->sb_n_free_dnodes = -1;
 546         sbi->sb_lowercase = lowercase;
 547         sbi->sb_eas = eas;
 548         sbi->sb_chk = chk;
 549         sbi->sb_chkdsk = chkdsk;
 550         sbi->sb_err = errs;
 551         sbi->sb_timeshift = timeshift;
 552         sbi->sb_was_error = 0;
 553         sbi->sb_cp_table = NULL;
 554         sbi->sb_c_bitmap = -1;
 555         sbi->sb_max_fwd_alloc = 0xffffff;
 556
 557         /* Load bitmap directory */
 558         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 559                 goto bail4;
 560
 561         /* Check for general fs errors*/
 562         if (spareblock->dirty && !spareblock->old_wrote) {
 563                 if (errs == 2) {
 564                         printk("HPFS: Improperly stopped, not mounted\n");
 565                         goto bail4;
 566                 }
 567                 hpfs_error(s, "improperly stopped");
 568         }
 569
 570         if (!(s->s_flags & MS_RDONLY)) {
 571                 spareblock->dirty = 1;
 572                 spareblock->old_wrote = 0;
 573                 mark_buffer_dirty(bh2);
 574         }
 575
 576         if (le32_to_cpu(spareblock->hotfixes_used) || le32_to_cpu(spareblock->n_spares_used)) {
 577                 if (errs >= 2) {
 578                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 579                         mark_dirty(s, 0);
 580                         goto bail4;
 581                 }
 582                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 583                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 584                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 585         }
 586         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 587                 if (errs >= 2) {
 588                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 589                         mark_dirty(s, 0);
 590                         goto bail4;
 591                 }
 592                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 593                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 594         }
 595         if (chk) {
 596                 unsigned a;
 597                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 598                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 599                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 600                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 601                         goto bail4;
 602                 }
 603                 a = sbi->sb_dirband_size;
 604                 sbi->sb_dirband_size = 0;
 605                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 606                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 607                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 608                         mark_dirty(s, 0);
 609                         goto bail4;
 610                 }
 611                 sbi->sb_dirband_size = a;
 612         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 613
 614         /* Load code page table */
 615         if (le32_to_cpu(spareblock->n_code_pages))
 616                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 617                         printk("HPFS: Warning: code page support is disabled\n");
 618
 619         brelse(bh2);
 620         brelse(bh1);
 621         brelse(bh0);
 622
 623         root = iget_locked(s, sbi->sb_root);
 624         if (!root)
 625                 goto bail0;
 626         hpfs_init_inode(root);
 627         hpfs_read_inode(root);
 628         unlock_new_inode(root);
 629         s->s_root = d_alloc_root(root);
 630         if (!s->s_root) {
 631                 iput(root);
 632                 goto bail0;
 633         }
 634
 635         /*
 636          * find the root directory's . pointer & finish filling in the inode
 637          */
 638
 639         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 640         if (root_dno)
 641                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 642         if (!de)
 643                 hpfs_error(s, "unable to find root dir");
 644         else {
 645                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 646                 root->i_atime.tv_nsec = 0;
 647                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 648                 root->i_mtime.tv_nsec = 0;
 649                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 650                 root->i_ctime.tv_nsec = 0;
 651                 hpfs_i(root)->i_ea_size = le16_to_cpu(de->ea_size);
 652                 hpfs_i(root)->i_parent_dir = root->i_ino;
 653                 if (root->i_size == -1)
 654                         root->i_size = 2048;
 655                 if (root->i_blocks == -1)
 656                         root->i_blocks = 5;
 657                 hpfs_brelse4(&qbh);
 658         }
 659         hpfs_unlock(s);
 660         return 0;
 661
 662 bail4:  brelse(bh2);
 663 bail3:  brelse(bh1);
 664 bail2:  brelse(bh0);
 665 bail1:
 666 bail0:
 667         hpfs_unlock(s);
 668         kfree(sbi->sb_bmp_dir);
 669         kfree(sbi->sb_cp_table);
 670         s->s_fs_info = NULL;
 671         kfree(sbi);
 672         return -EINVAL;
 673 }
 674
 675 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 676         int flags, const char *dev_name, void *data)
 677 {
 678         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 679 }
 680
 681 static struct file_system_type hpfs_fs_type = {
 682         .owner          = THIS_MODULE,
 683         .name           = "hpfs",
 684         .mount          = hpfs_mount,
 685         .kill_sb        = kill_block_super,
 686         .fs_flags       = FS_REQUIRES_DEV,
 687 };
 688
 689 static int __init init_hpfs_fs(void)
 690 {
 691         int err = init_inodecache();
 692         if (err)
 693                 goto out1;
 694         err = register_filesystem(&hpfs_fs_type);
 695         if (err)
 696                 goto out;
 697         return 0;
 698 out:
 699         destroy_inodecache();
 700 out1:
 701         return err;
 702 }
 703
 704 static void __exit exit_hpfs_fs(void)
 705 {
 706         unregister_filesystem(&hpfs_fs_type);
 707         destroy_inodecache();
 708 }
 709
 710 module_init(init_hpfs_fs)
 711 module_exit(exit_hpfs_fs)
 712 MODULE_LICENSE("GPL");