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_i_callback(struct rcu_head *head)
 181 {
 182         struct inode *inode = container_of(head, struct inode, i_rcu);
 183         INIT_LIST_HEAD(&inode->i_dentry);
 184         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 185 }
 186
 187 static void hpfs_destroy_inode(struct inode *inode)
 188 {
 189         call_rcu(&inode->i_rcu, hpfs_i_callback);
 190 }
 191
 192 static void init_once(void *foo)
 193 {
 194         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 195
 196         mutex_init(&ei->i_mutex);
 197         mutex_init(&ei->i_parent_mutex);
 198         inode_init_once(&ei->vfs_inode);
 199 }
 200
 201 static int init_inodecache(void)
 202 {
 203         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 204                                              sizeof(struct hpfs_inode_info),
 205                                              0, (SLAB_RECLAIM_ACCOUNT|
 206                                                 SLAB_MEM_SPREAD),
 207                                              init_once);
 208         if (hpfs_inode_cachep == NULL)
 209                 return -ENOMEM;
 210         return 0;
 211 }
 212
 213 static void destroy_inodecache(void)
 214 {
 215         kmem_cache_destroy(hpfs_inode_cachep);
 216 }
 217
 218 /*
 219  * A tiny parser for option strings, stolen from dosfs.
 220  * Stolen again from read-only hpfs.
 221  * And updated for table-driven option parsing.
 222  */
 223
 224 enum {
 225         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 226         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
 227         Opt_check_none, Opt_check_normal, Opt_check_strict,
 228         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 229         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 230         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 231         Opt_timeshift, Opt_err,
 232 };
 233
 234 static const match_table_t tokens = {
 235         {Opt_help, "help"},
 236         {Opt_uid, "uid=%u"},
 237         {Opt_gid, "gid=%u"},
 238         {Opt_umask, "umask=%o"},
 239         {Opt_case_lower, "case=lower"},
 240         {Opt_case_asis, "case=asis"},
 241         {Opt_conv_binary, "conv=binary"},
 242         {Opt_conv_text, "conv=text"},
 243         {Opt_conv_auto, "conv=auto"},
 244         {Opt_check_none, "check=none"},
 245         {Opt_check_normal, "check=normal"},
 246         {Opt_check_strict, "check=strict"},
 247         {Opt_err_cont, "errors=continue"},
 248         {Opt_err_ro, "errors=remount-ro"},
 249         {Opt_err_panic, "errors=panic"},
 250         {Opt_eas_no, "eas=no"},
 251         {Opt_eas_ro, "eas=ro"},
 252         {Opt_eas_rw, "eas=rw"},
 253         {Opt_chkdsk_no, "chkdsk=no"},
 254         {Opt_chkdsk_errors, "chkdsk=errors"},
 255         {Opt_chkdsk_always, "chkdsk=always"},
 256         {Opt_timeshift, "timeshift=%d"},
 257         {Opt_err, NULL},
 258 };
 259
 260 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 261                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
 262                       int *chkdsk, int *timeshift)
 263 {
 264         char *p;
 265         int option;
 266
 267         if (!opts)
 268                 return 1;
 269
 270         /*printk("Parsing opts: '%s'\n",opts);*/
 271
 272         while ((p = strsep(&opts, ",")) != NULL) {
 273                 substring_t args[MAX_OPT_ARGS];
 274                 int token;
 275                 if (!*p)
 276                         continue;
 277
 278                 token = match_token(p, tokens, args);
 279                 switch (token) {
 280                 case Opt_help:
 281                         return 2;
 282                 case Opt_uid:
 283                         if (match_int(args, &option))
 284                                 return 0;
 285                         *uid = option;
 286                         break;
 287                 case Opt_gid:
 288                         if (match_int(args, &option))
 289                                 return 0;
 290                         *gid = option;
 291                         break;
 292                 case Opt_umask:
 293                         if (match_octal(args, &option))
 294                                 return 0;
 295                         *umask = option;
 296                         break;
 297                 case Opt_case_lower:
 298                         *lowercase = 1;
 299                         break;
 300                 case Opt_case_asis:
 301                         *lowercase = 0;
 302                         break;
 303                 case Opt_conv_binary:
 304                         *conv = CONV_BINARY;
 305                         break;
 306                 case Opt_conv_text:
 307                         *conv = CONV_TEXT;
 308                         break;
 309                 case Opt_conv_auto:
 310                         *conv = CONV_AUTO;
 311                         break;
 312                 case Opt_check_none:
 313                         *chk = 0;
 314                         break;
 315                 case Opt_check_normal:
 316                         *chk = 1;
 317                         break;
 318                 case Opt_check_strict:
 319                         *chk = 2;
 320                         break;
 321                 case Opt_err_cont:
 322                         *errs = 0;
 323                         break;
 324                 case Opt_err_ro:
 325                         *errs = 1;
 326                         break;
 327                 case Opt_err_panic:
 328                         *errs = 2;
 329                         break;
 330                 case Opt_eas_no:
 331                         *eas = 0;
 332                         break;
 333                 case Opt_eas_ro:
 334                         *eas = 1;
 335                         break;
 336                 case Opt_eas_rw:
 337                         *eas = 2;
 338                         break;
 339                 case Opt_chkdsk_no:
 340                         *chkdsk = 0;
 341                         break;
 342                 case Opt_chkdsk_errors:
 343                         *chkdsk = 1;
 344                         break;
 345                 case Opt_chkdsk_always:
 346                         *chkdsk = 2;
 347                         break;
 348                 case Opt_timeshift:
 349                 {
 350                         int m = 1;
 351                         char *rhs = args[0].from;
 352                         if (!rhs || !*rhs)
 353                                 return 0;
 354                         if (*rhs == '-') m = -1;
 355                         if (*rhs == '+' || *rhs == '-') rhs++;
 356                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 357                         if (*rhs)
 358                                 return 0;
 359                         break;
 360                 }
 361                 default:
 362                         return 0;
 363                 }
 364         }
 365         return 1;
 366 }
 367
 368 static inline void hpfs_help(void)
 369 {
 370         printk("\n\
 371 HPFS filesystem options:\n\
 372       help              do not mount and display this text\n\
 373       uid=xxx           set uid of files that don't have uid specified in eas\n\
 374       gid=xxx           set gid of files that don't have gid specified in eas\n\
 375       umask=xxx         set mode of files that don't have mode specified in eas\n\
 376       case=lower        lowercase all files\n\
 377       case=asis         do not lowercase files (default)\n\
 378       conv=binary       do not convert CR/LF -> LF (default)\n\
 379       conv=auto         convert only files with known text extensions\n\
 380       conv=text         convert all files\n\
 381       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 382       check=normal      do some checks - it should not crash (default)\n\
 383       check=strict      do extra time-consuming checks, used for debugging\n\
 384       errors=continue   continue on errors\n\
 385       errors=remount-ro remount read-only if errors found (default)\n\
 386       errors=panic      panic on errors\n\
 387       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 388       chkdsk=errors     mark fs dirty if errors found (default)\n\
 389       chkdsk=always     always mark fs dirty - used for debugging\n\
 390       eas=no            ignore extended attributes\n\
 391       eas=ro            read but do not write extended attributes\n\
 392       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 393       timeshift=nnn     add nnn seconds to file times\n\
 394 \n");
 395 }
 396
 397 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 398 {
 399         uid_t uid;
 400         gid_t gid;
 401         umode_t umask;
 402         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 403         int o;
 404         struct hpfs_sb_info *sbi = hpfs_sb(s);
 405         char *new_opts = kstrdup(data, GFP_KERNEL);
 406
 407         *flags |= MS_NOATIME;
 408
 409         lock_kernel();
 410         lock_super(s);
 411         uid = sbi->sb_uid; gid = sbi->sb_gid;
 412         umask = 0777 & ~sbi->sb_mode;
 413         lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
 414         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 415         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 416
 417         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
 418             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 419                 printk("HPFS: bad mount options.\n");
 420                 goto out_err;
 421         }
 422         if (o == 2) {
 423                 hpfs_help();
 424                 goto out_err;
 425         }
 426         if (timeshift != sbi->sb_timeshift) {
 427                 printk("HPFS: timeshift can't be changed using remount.\n");
 428                 goto out_err;
 429         }
 430
 431         unmark_dirty(s);
 432
 433         sbi->sb_uid = uid; sbi->sb_gid = gid;
 434         sbi->sb_mode = 0777 & ~umask;
 435         sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
 436         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 437         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 438
 439         if (!(*flags & MS_RDONLY)) mark_dirty(s);
 440
 441         replace_mount_options(s, new_opts);
 442
 443         unlock_super(s);
 444         unlock_kernel();
 445         return 0;
 446
 447 out_err:
 448         unlock_super(s);
 449         unlock_kernel();
 450         kfree(new_opts);
 451         return -EINVAL;
 452 }
 453
 454 /* Super operations */
 455
 456 static const struct super_operations hpfs_sops =
 457 {
 458         .alloc_inode    = hpfs_alloc_inode,
 459         .destroy_inode  = hpfs_destroy_inode,
 460         .evict_inode    = hpfs_evict_inode,
 461         .put_super      = hpfs_put_super,
 462         .statfs         = hpfs_statfs,
 463         .remount_fs     = hpfs_remount_fs,
 464         .show_options   = generic_show_options,
 465 };
 466
 467 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 468 {
 469         struct buffer_head *bh0, *bh1, *bh2;
 470         struct hpfs_boot_block *bootblock;
 471         struct hpfs_super_block *superblock;
 472         struct hpfs_spare_block *spareblock;
 473         struct hpfs_sb_info *sbi;
 474         struct inode *root;
 475
 476         uid_t uid;
 477         gid_t gid;
 478         umode_t umask;
 479         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 480
 481         dnode_secno root_dno;
 482         struct hpfs_dirent *de = NULL;
 483         struct quad_buffer_head qbh;
 484
 485         int o;
 486
 487         lock_kernel();
 488
 489         save_mount_options(s, options);
 490
 491         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 492         if (!sbi) {
 493                 unlock_kernel();
 494                 return -ENOMEM;
 495         }
 496         s->s_fs_info = sbi;
 497
 498         sbi->sb_bmp_dir = NULL;
 499         sbi->sb_cp_table = NULL;
 500
 501         mutex_init(&sbi->hpfs_creation_de);
 502
 503         uid = current_uid();
 504         gid = current_gid();
 505         umask = current_umask();
 506         lowercase = 0;
 507         conv = CONV_BINARY;
 508         eas = 2;
 509         chk = 1;
 510         errs = 1;
 511         chkdsk = 1;
 512         timeshift = 0;
 513
 514         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
 515             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 516                 printk("HPFS: bad mount options.\n");
 517                 goto bail0;
 518         }
 519         if (o==2) {
 520                 hpfs_help();
 521                 goto bail0;
 522         }
 523
 524         /*sbi->sb_mounting = 1;*/
 525         sb_set_blocksize(s, 512);
 526         sbi->sb_fs_size = -1;
 527         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 528         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 529         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 530
 531         /* Check magics */
 532         if (/*bootblock->magic != BB_MAGIC
 533             ||*/ superblock->magic != SB_MAGIC
 534             || spareblock->magic != SP_MAGIC) {
 535                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
 536                 goto bail4;
 537         }
 538
 539         /* Check version */
 540         if (!(s->s_flags & MS_RDONLY) &&
 541               superblock->funcversion != 2 && superblock->funcversion != 3) {
 542                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
 543                         (int)superblock->version, (int)superblock->funcversion);
 544                 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");
 545                 goto bail4;
 546         }
 547
 548         s->s_flags |= MS_NOATIME;
 549
 550         /* Fill superblock stuff */
 551         s->s_magic = HPFS_SUPER_MAGIC;
 552         s->s_op = &hpfs_sops;
 553
 554         sbi->sb_root = superblock->root;
 555         sbi->sb_fs_size = superblock->n_sectors;
 556         sbi->sb_bitmaps = superblock->bitmaps;
 557         sbi->sb_dirband_start = superblock->dir_band_start;
 558         sbi->sb_dirband_size = superblock->n_dir_band;
 559         sbi->sb_dmap = superblock->dir_band_bitmap;
 560         sbi->sb_uid = uid;
 561         sbi->sb_gid = gid;
 562         sbi->sb_mode = 0777 & ~umask;
 563         sbi->sb_n_free = -1;
 564         sbi->sb_n_free_dnodes = -1;
 565         sbi->sb_lowercase = lowercase;
 566         sbi->sb_conv = conv;
 567         sbi->sb_eas = eas;
 568         sbi->sb_chk = chk;
 569         sbi->sb_chkdsk = chkdsk;
 570         sbi->sb_err = errs;
 571         sbi->sb_timeshift = timeshift;
 572         sbi->sb_was_error = 0;
 573         sbi->sb_cp_table = NULL;
 574         sbi->sb_c_bitmap = -1;
 575         sbi->sb_max_fwd_alloc = 0xffffff;
 576
 577         /* Load bitmap directory */
 578         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
 579                 goto bail4;
 580
 581         /* Check for general fs errors*/
 582         if (spareblock->dirty && !spareblock->old_wrote) {
 583                 if (errs == 2) {
 584                         printk("HPFS: Improperly stopped, not mounted\n");
 585                         goto bail4;
 586                 }
 587                 hpfs_error(s, "improperly stopped");
 588         }
 589
 590         if (!(s->s_flags & MS_RDONLY)) {
 591                 spareblock->dirty = 1;
 592                 spareblock->old_wrote = 0;
 593                 mark_buffer_dirty(bh2);
 594         }
 595
 596         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 597                 if (errs >= 2) {
 598                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 599                         mark_dirty(s);
 600                         goto bail4;
 601                 }
 602                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 603                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 604                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 605         }
 606         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
 607                 if (errs >= 2) {
 608                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 609                         mark_dirty(s);
 610                         goto bail4;
 611                 }
 612                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 613                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 614         }
 615         if (chk) {
 616                 unsigned a;
 617                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
 618                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
 619                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 620                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
 621                         goto bail4;
 622                 }
 623                 a = sbi->sb_dirband_size;
 624                 sbi->sb_dirband_size = 0;
 625                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
 626                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
 627                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
 628                         mark_dirty(s);
 629                         goto bail4;
 630                 }
 631                 sbi->sb_dirband_size = a;
 632         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 633
 634         /* Load code page table */
 635         if (spareblock->n_code_pages)
 636                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
 637                         printk("HPFS: Warning: code page support is disabled\n");
 638
 639         brelse(bh2);
 640         brelse(bh1);
 641         brelse(bh0);
 642
 643         root = iget_locked(s, sbi->sb_root);
 644         if (!root)
 645                 goto bail0;
 646         hpfs_init_inode(root);
 647         hpfs_read_inode(root);
 648         unlock_new_inode(root);
 649         s->s_root = d_alloc_root(root);
 650         if (!s->s_root) {
 651                 iput(root);
 652                 goto bail0;
 653         }
 654         hpfs_set_dentry_operations(s->s_root);
 655
 656         /*
 657          * find the root directory's . pointer & finish filling in the inode
 658          */
 659
 660         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 661         if (root_dno)
 662                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 663         if (!de)
 664                 hpfs_error(s, "unable to find root dir");
 665         else {
 666                 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
 667                 root->i_atime.tv_nsec = 0;
 668                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
 669                 root->i_mtime.tv_nsec = 0;
 670                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
 671                 root->i_ctime.tv_nsec = 0;
 672                 hpfs_i(root)->i_ea_size = de->ea_size;
 673                 hpfs_i(root)->i_parent_dir = root->i_ino;
 674                 if (root->i_size == -1)
 675                         root->i_size = 2048;
 676                 if (root->i_blocks == -1)
 677                         root->i_blocks = 5;
 678                 hpfs_brelse4(&qbh);
 679         }
 680         unlock_kernel();
 681         return 0;
 682
 683 bail4:  brelse(bh2);
 684 bail3:  brelse(bh1);
 685 bail2:  brelse(bh0);
 686 bail1:
 687 bail0:
 688         kfree(sbi->sb_bmp_dir);
 689         kfree(sbi->sb_cp_table);
 690         s->s_fs_info = NULL;
 691         kfree(sbi);
 692         unlock_kernel();
 693         return -EINVAL;
 694 }
 695
 696 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 697         int flags, const char *dev_name, void *data)
 698 {
 699         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 700 }
 701
 702 static struct file_system_type hpfs_fs_type = {
 703         .owner          = THIS_MODULE,
 704         .name           = "hpfs",
 705         .mount          = hpfs_mount,
 706         .kill_sb        = kill_block_super,
 707         .fs_flags       = FS_REQUIRES_DEV,
 708 };
 709
 710 static int __init init_hpfs_fs(void)
 711 {
 712         int err = init_inodecache();
 713         if (err)
 714                 goto out1;
 715         err = register_filesystem(&hpfs_fs_type);
 716         if (err)
 717                 goto out;
 718         return 0;
 719 out:
 720         destroy_inodecache();
 721 out1:
 722         return err;
 723 }
 724
 725 static void __exit exit_hpfs_fs(void)
 726 {
 727         unregister_filesystem(&hpfs_fs_type);
 728         destroy_inodecache();
 729 }
 730
 731 module_init(init_hpfs_fs)
 732 module_exit(exit_hpfs_fs)
 733 MODULE_LICENSE("GPL");