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