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 free_sbi(struct hpfs_sb_info *sbi)
 105 {
 106         kfree(sbi->sb_cp_table);
 107         kfree(sbi->sb_bmp_dir);
 108         kfree(sbi);
 109 }
 110
 111 static void lazy_free_sbi(struct rcu_head *rcu)
 112 {
 113         free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
 114 }
 115
 116 static void hpfs_put_super(struct super_block *s)
 117 {
 118         hpfs_lock(s);
 119         unmark_dirty(s);
 120         hpfs_unlock(s);
 121         call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
 122 }
 123
 124 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 125 {
 126         struct quad_buffer_head qbh;
 127         unsigned long *bits;
 128         unsigned count;
 129
 130         bits = hpfs_map_4sectors(s, secno, &qbh, 0);
 131         if (!bits)
 132                 return 0;
 133         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 134         hpfs_brelse4(&qbh);
 135         return count;
 136 }
 137
 138 static unsigned count_bitmaps(struct super_block *s)
 139 {
 140         unsigned n, count, n_bands;
 141         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 142         count = 0;
 143         for (n = 0; n < COUNT_RD_AHEAD; n++) {
 144                 hpfs_prefetch_bitmap(s, n);
 145         }
 146         for (n = 0; n < n_bands; n++) {
 147                 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
 148                 count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
 149         }
 150         return count;
 151 }
 152
 153 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 154 {
 155         struct super_block *s = dentry->d_sb;
 156         struct hpfs_sb_info *sbi = hpfs_sb(s);
 157         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 158         hpfs_lock(s);
 159
 160         /*if (sbi->sb_n_free == -1) {*/
 161                 sbi->sb_n_free = count_bitmaps(s);
 162                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 163         /*}*/
 164         buf->f_type = s->s_magic;
 165         buf->f_bsize = 512;
 166         buf->f_blocks = sbi->sb_fs_size;
 167         buf->f_bfree = sbi->sb_n_free;
 168         buf->f_bavail = sbi->sb_n_free;
 169         buf->f_files = sbi->sb_dirband_size / 4;
 170         buf->f_ffree = sbi->sb_n_free_dnodes;
 171         buf->f_fsid.val[0] = (u32)id;
 172         buf->f_fsid.val[1] = (u32)(id >> 32);
 173         buf->f_namelen = 254;
 174
 175         hpfs_unlock(s);
 176
 177         return 0;
 178 }
 179
 180 static struct kmem_cache * hpfs_inode_cachep;
 181
 182 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 183 {
 184         struct hpfs_inode_info *ei;
 185         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 186         if (!ei)
 187                 return NULL;
 188         ei->vfs_inode.i_version = 1;
 189         return &ei->vfs_inode;
 190 }
 191
 192 static void hpfs_i_callback(struct rcu_head *head)
 193 {
 194         struct inode *inode = container_of(head, struct inode, i_rcu);
 195         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 196 }
 197
 198 static void hpfs_destroy_inode(struct inode *inode)
 199 {
 200         call_rcu(&inode->i_rcu, hpfs_i_callback);
 201 }
 202
 203 static void init_once(void *foo)
 204 {
 205         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 206
 207         inode_init_once(&ei->vfs_inode);
 208 }
 209
 210 static int init_inodecache(void)
 211 {
 212         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 213                                              sizeof(struct hpfs_inode_info),
 214                                              0, (SLAB_RECLAIM_ACCOUNT|
 215                                                 SLAB_MEM_SPREAD),
 216                                              init_once);
 217         if (hpfs_inode_cachep == NULL)
 218                 return -ENOMEM;
 219         return 0;
 220 }
 221
 222 static void destroy_inodecache(void)
 223 {
 224         /*
 225          * Make sure all delayed rcu free inodes are flushed before we
 226          * destroy cache.
 227          */
 228         rcu_barrier();
 229         kmem_cache_destroy(hpfs_inode_cachep);
 230 }
 231
 232 /*
 233  * A tiny parser for option strings, stolen from dosfs.
 234  * Stolen again from read-only hpfs.
 235  * And updated for table-driven option parsing.
 236  */
 237
 238 enum {
 239         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 240         Opt_check_none, Opt_check_normal, Opt_check_strict,
 241         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 242         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 243         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 244         Opt_timeshift, Opt_err,
 245 };
 246
 247 static const match_table_t tokens = {
 248         {Opt_help, "help"},
 249         {Opt_uid, "uid=%u"},
 250         {Opt_gid, "gid=%u"},
 251         {Opt_umask, "umask=%o"},
 252         {Opt_case_lower, "case=lower"},
 253         {Opt_case_asis, "case=asis"},
 254         {Opt_check_none, "check=none"},
 255         {Opt_check_normal, "check=normal"},
 256         {Opt_check_strict, "check=strict"},
 257         {Opt_err_cont, "errors=continue"},
 258         {Opt_err_ro, "errors=remount-ro"},
 259         {Opt_err_panic, "errors=panic"},
 260         {Opt_eas_no, "eas=no"},
 261         {Opt_eas_ro, "eas=ro"},
 262         {Opt_eas_rw, "eas=rw"},
 263         {Opt_chkdsk_no, "chkdsk=no"},
 264         {Opt_chkdsk_errors, "chkdsk=errors"},
 265         {Opt_chkdsk_always, "chkdsk=always"},
 266         {Opt_timeshift, "timeshift=%d"},
 267         {Opt_err, NULL},
 268 };
 269
 270 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
 271                       int *lowercase, int *eas, int *chk, int *errs,
 272                       int *chkdsk, int *timeshift)
 273 {
 274         char *p;
 275         int option;
 276
 277         if (!opts)
 278                 return 1;
 279
 280         /*printk("Parsing opts: '%s'\n",opts);*/
 281
 282         while ((p = strsep(&opts, ",")) != NULL) {
 283                 substring_t args[MAX_OPT_ARGS];
 284                 int token;
 285                 if (!*p)
 286                         continue;
 287
 288                 token = match_token(p, tokens, args);
 289                 switch (token) {
 290                 case Opt_help:
 291                         return 2;
 292                 case Opt_uid:
 293                         if (match_int(args, &option))
 294                                 return 0;
 295                         *uid = make_kuid(current_user_ns(), option);
 296                         if (!uid_valid(*uid))
 297                                 return 0;
 298                         break;
 299                 case Opt_gid:
 300                         if (match_int(args, &option))
 301                                 return 0;
 302                         *gid = make_kgid(current_user_ns(), option);
 303                         if (!gid_valid(*gid))
 304                                 return 0;
 305                         break;
 306                 case Opt_umask:
 307                         if (match_octal(args, &option))
 308                                 return 0;
 309                         *umask = option;
 310                         break;
 311                 case Opt_case_lower:
 312                         *lowercase = 1;
 313                         break;
 314                 case Opt_case_asis:
 315                         *lowercase = 0;
 316                         break;
 317                 case Opt_check_none:
 318                         *chk = 0;
 319                         break;
 320                 case Opt_check_normal:
 321                         *chk = 1;
 322                         break;
 323                 case Opt_check_strict:
 324                         *chk = 2;
 325                         break;
 326                 case Opt_err_cont:
 327                         *errs = 0;
 328                         break;
 329                 case Opt_err_ro:
 330                         *errs = 1;
 331                         break;
 332                 case Opt_err_panic:
 333                         *errs = 2;
 334                         break;
 335                 case Opt_eas_no:
 336                         *eas = 0;
 337                         break;
 338                 case Opt_eas_ro:
 339                         *eas = 1;
 340                         break;
 341                 case Opt_eas_rw:
 342                         *eas = 2;
 343                         break;
 344                 case Opt_chkdsk_no:
 345                         *chkdsk = 0;
 346                         break;
 347                 case Opt_chkdsk_errors:
 348                         *chkdsk = 1;
 349                         break;
 350                 case Opt_chkdsk_always:
 351                         *chkdsk = 2;
 352                         break;
 353                 case Opt_timeshift:
 354                 {
 355                         int m = 1;
 356                         char *rhs = args[0].from;
 357                         if (!rhs || !*rhs)
 358                                 return 0;
 359                         if (*rhs == '-') m = -1;
 360                         if (*rhs == '+' || *rhs == '-') rhs++;
 361                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 362                         if (*rhs)
 363                                 return 0;
 364                         break;
 365                 }
 366                 default:
 367                         return 0;
 368                 }
 369         }
 370         return 1;
 371 }
 372
 373 static inline void hpfs_help(void)
 374 {
 375         printk("\n\
 376 HPFS filesystem options:\n\
 377       help              do not mount and display this text\n\
 378       uid=xxx           set uid of files that don't have uid specified in eas\n\
 379       gid=xxx           set gid of files that don't have gid specified in eas\n\
 380       umask=xxx         set mode of files that don't have mode specified in eas\n\
 381       case=lower        lowercase all files\n\
 382       case=asis         do not lowercase files (default)\n\
 383       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 384       check=normal      do some checks - it should not crash (default)\n\
 385       check=strict      do extra time-consuming checks, used for debugging\n\
 386       errors=continue   continue on errors\n\
 387       errors=remount-ro remount read-only if errors found (default)\n\
 388       errors=panic      panic on errors\n\
 389       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 390       chkdsk=errors     mark fs dirty if errors found (default)\n\
 391       chkdsk=always     always mark fs dirty - used for debugging\n\
 392       eas=no            ignore extended attributes\n\
 393       eas=ro            read but do not write extended attributes\n\
 394       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 395       timeshift=nnn     add nnn seconds to file times\n\
 396 \n");
 397 }
 398
 399 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 400 {
 401         kuid_t uid;
 402         kgid_t gid;
 403         umode_t umask;
 404         int lowercase, eas, chk, errs, chkdsk, timeshift;
 405         int o;
 406         struct hpfs_sb_info *sbi = hpfs_sb(s);
 407         char *new_opts = kstrdup(data, GFP_KERNEL);
 408
 409         *flags |= MS_NOATIME;
 410
 411         hpfs_lock(s);
 412         uid = sbi->sb_uid; gid = sbi->sb_gid;
 413         umask = 0777 & ~sbi->sb_mode;
 414         lowercase = sbi->sb_lowercase;
 415         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 416         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 417
 418         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 419             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 420                 printk("HPFS: bad mount options.\n");
 421                 goto out_err;
 422         }
 423         if (o == 2) {
 424                 hpfs_help();
 425                 goto out_err;
 426         }
 427         if (timeshift != sbi->sb_timeshift) {
 428                 printk("HPFS: timeshift can't be changed using remount.\n");
 429                 goto out_err;
 430         }
 431
 432         unmark_dirty(s);
 433
 434         sbi->sb_uid = uid; sbi->sb_gid = gid;
 435         sbi->sb_mode = 0777 & ~umask;
 436         sbi->sb_lowercase = lowercase;
 437         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 438         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 439
 440         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
 441
 442         replace_mount_options(s, new_opts);
 443
 444         hpfs_unlock(s);
 445         return 0;
 446
 447 out_err:
 448         hpfs_unlock(s);
 449         kfree(new_opts);
 450         return -EINVAL;
 451 }
 452
 453 /* Super operations */
 454
 455 static const struct super_operations hpfs_sops =
 456 {
 457         .alloc_inode    = hpfs_alloc_inode,
 458         .destroy_inode  = hpfs_destroy_inode,
 459         .evict_inode    = hpfs_evict_inode,
 460         .put_super      = hpfs_put_super,
 461         .statfs         = hpfs_statfs,
 462         .remount_fs     = hpfs_remount_fs,
 463         .show_options   = generic_show_options,
 464 };
 465
 466 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 467 {
 468         struct buffer_head *bh0, *bh1, *bh2;
 469         struct hpfs_boot_block *bootblock;
 470         struct hpfs_super_block *superblock;
 471         struct hpfs_spare_block *spareblock;
 472         struct hpfs_sb_info *sbi;
 473         struct inode *root;
 474
 475         kuid_t uid;
 476         kgid_t gid;
 477         umode_t umask;
 478         int lowercase, eas, chk, errs, chkdsk, timeshift;
 479
 480         dnode_secno root_dno;
 481         struct hpfs_dirent *de = NULL;
 482         struct quad_buffer_head qbh;
 483
 484         int o;
 485
 486         save_mount_options(s, options);
 487
 488         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 489         if (!sbi) {
 490                 return -ENOMEM;
 491         }
 492         s->s_fs_info = sbi;
 493
 494         mutex_init(&sbi->hpfs_mutex);
 495         hpfs_lock(s);
 496
 497         uid = current_uid();
 498         gid = current_gid();
 499         umask = current_umask();
 500         lowercase = 0;
 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,
 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 (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 526             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 527             || le32_to_cpu(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         s->s_d_op = &hpfs_dentry_operations;
 547
 548         sbi->sb_root = le32_to_cpu(superblock->root);
 549         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 550         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 551         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 552         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 553         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 554         sbi->sb_uid = uid;
 555         sbi->sb_gid = gid;
 556         sbi->sb_mode = 0777 & ~umask;
 557         sbi->sb_n_free = -1;
 558         sbi->sb_n_free_dnodes = -1;
 559         sbi->sb_lowercase = lowercase;
 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         if (sbi->sb_fs_size >= 0x80000000) {
 571                 hpfs_error(s, "invalid size in superblock: %08x",
 572                         (unsigned)sbi->sb_fs_size);
 573                 goto bail4;
 574         }
 575
 576         /* Load bitmap directory */
 577         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 578                 goto bail4;
 579
 580         /* Check for general fs errors*/
 581         if (spareblock->dirty && !spareblock->old_wrote) {
 582                 if (errs == 2) {
 583                         printk("HPFS: Improperly stopped, not mounted\n");
 584                         goto bail4;
 585                 }
 586                 hpfs_error(s, "improperly stopped");
 587         }
 588
 589         if (!(s->s_flags & MS_RDONLY)) {
 590                 spareblock->dirty = 1;
 591                 spareblock->old_wrote = 0;
 592                 mark_buffer_dirty(bh2);
 593         }
 594
 595         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 596                 if (errs >= 2) {
 597                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 598                         mark_dirty(s, 0);
 599                         goto bail4;
 600                 }
 601                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 602                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 603                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 604         }
 605         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 606                 if (errs >= 2) {
 607                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 608                         mark_dirty(s, 0);
 609                         goto bail4;
 610                 }
 611                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 612                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 613         }
 614         if (chk) {
 615                 unsigned a;
 616                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 617                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 618                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 619                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 620                         goto bail4;
 621                 }
 622                 a = sbi->sb_dirband_size;
 623                 sbi->sb_dirband_size = 0;
 624                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 625                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 626                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 627                         mark_dirty(s, 0);
 628                         goto bail4;
 629                 }
 630                 sbi->sb_dirband_size = a;
 631         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 632
 633         /* Load code page table */
 634         if (le32_to_cpu(spareblock->n_code_pages))
 635                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 636                         printk("HPFS: Warning: code page support is disabled\n");
 637
 638         brelse(bh2);
 639         brelse(bh1);
 640         brelse(bh0);
 641
 642         root = iget_locked(s, sbi->sb_root);
 643         if (!root)
 644                 goto bail0;
 645         hpfs_init_inode(root);
 646         hpfs_read_inode(root);
 647         unlock_new_inode(root);
 648         s->s_root = d_make_root(root);
 649         if (!s->s_root)
 650                 goto bail0;
 651
 652         /*
 653          * find the root directory's . pointer & finish filling in the inode
 654          */
 655
 656         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 657         if (root_dno)
 658                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 659         if (!de)
 660                 hpfs_error(s, "unable to find root dir");
 661         else {
 662                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 663                 root->i_atime.tv_nsec = 0;
 664                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 665                 root->i_mtime.tv_nsec = 0;
 666                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 667                 root->i_ctime.tv_nsec = 0;
 668                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 669                 hpfs_i(root)->i_parent_dir = root->i_ino;
 670                 if (root->i_size == -1)
 671                         root->i_size = 2048;
 672                 if (root->i_blocks == -1)
 673                         root->i_blocks = 5;
 674                 hpfs_brelse4(&qbh);
 675         }
 676         hpfs_unlock(s);
 677         return 0;
 678
 679 bail4:  brelse(bh2);
 680 bail3:  brelse(bh1);
 681 bail2:  brelse(bh0);
 682 bail1:
 683 bail0:
 684         hpfs_unlock(s);
 685         free_sbi(sbi);
 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 MODULE_ALIAS_FS("hpfs");
 703
 704 static int __init init_hpfs_fs(void)
 705 {
 706         int err = init_inodecache();
 707         if (err)
 708                 goto out1;
 709         err = register_filesystem(&hpfs_fs_type);
 710         if (err)
 711                 goto out;
 712         return 0;
 713 out:
 714         destroy_inodecache();
 715 out1:
 716         return err;
 717 }
 718
 719 static void __exit exit_hpfs_fs(void)
 720 {
 721         unregister_filesystem(&hpfs_fs_type);
 722         destroy_inodecache();
 723 }
 724
 725 module_init(init_hpfs_fs)
 726 module_exit(exit_hpfs_fs)
 727 MODULE_LICENSE("GPL");