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 static 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 (unsigned)-1;
 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                 unsigned c;
 139                 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
 140                 if (c != (unsigned)-1)
 141                         count += c;
 142         }
 143         return count;
 144 }
 145
 146 unsigned hpfs_get_free_dnodes(struct super_block *s)
 147 {
 148         struct hpfs_sb_info *sbi = hpfs_sb(s);
 149         if (sbi->sb_n_free_dnodes == (unsigned)-1) {
 150                 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 151                 if (c == (unsigned)-1)
 152                         return 0;
 153                 sbi->sb_n_free_dnodes = c;
 154         }
 155         return sbi->sb_n_free_dnodes;
 156 }
 157
 158 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 159 {
 160         struct super_block *s = dentry->d_sb;
 161         struct hpfs_sb_info *sbi = hpfs_sb(s);
 162         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 163
 164         hpfs_lock(s);
 165
 166         if (sbi->sb_n_free == (unsigned)-1)
 167                 sbi->sb_n_free = count_bitmaps(s);
 168
 169         buf->f_type = s->s_magic;
 170         buf->f_bsize = 512;
 171         buf->f_blocks = sbi->sb_fs_size;
 172         buf->f_bfree = sbi->sb_n_free;
 173         buf->f_bavail = sbi->sb_n_free;
 174         buf->f_files = sbi->sb_dirband_size / 4;
 175         buf->f_ffree = hpfs_get_free_dnodes(s);
 176         buf->f_fsid.val[0] = (u32)id;
 177         buf->f_fsid.val[1] = (u32)(id >> 32);
 178         buf->f_namelen = 254;
 179
 180         hpfs_unlock(s);
 181
 182         return 0;
 183 }
 184
 185 static struct kmem_cache * hpfs_inode_cachep;
 186
 187 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 188 {
 189         struct hpfs_inode_info *ei;
 190         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 191         if (!ei)
 192                 return NULL;
 193         ei->vfs_inode.i_version = 1;
 194         return &ei->vfs_inode;
 195 }
 196
 197 static void hpfs_i_callback(struct rcu_head *head)
 198 {
 199         struct inode *inode = container_of(head, struct inode, i_rcu);
 200         INIT_LIST_HEAD(&inode->i_dentry);
 201         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 202 }
 203
 204 static void hpfs_destroy_inode(struct inode *inode)
 205 {
 206         call_rcu(&inode->i_rcu, hpfs_i_callback);
 207 }
 208
 209 static void init_once(void *foo)
 210 {
 211         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 212
 213         inode_init_once(&ei->vfs_inode);
 214 }
 215
 216 static int init_inodecache(void)
 217 {
 218         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 219                                              sizeof(struct hpfs_inode_info),
 220                                              0, (SLAB_RECLAIM_ACCOUNT|
 221                                                 SLAB_MEM_SPREAD),
 222                                              init_once);
 223         if (hpfs_inode_cachep == NULL)
 224                 return -ENOMEM;
 225         return 0;
 226 }
 227
 228 static void destroy_inodecache(void)
 229 {
 230         kmem_cache_destroy(hpfs_inode_cachep);
 231 }
 232
 233 /*
 234  * A tiny parser for option strings, stolen from dosfs.
 235  * Stolen again from read-only hpfs.
 236  * And updated for table-driven option parsing.
 237  */
 238
 239 enum {
 240         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 241         Opt_check_none, Opt_check_normal, Opt_check_strict,
 242         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 243         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 244         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 245         Opt_timeshift, Opt_err,
 246 };
 247
 248 static const match_table_t tokens = {
 249         {Opt_help, "help"},
 250         {Opt_uid, "uid=%u"},
 251         {Opt_gid, "gid=%u"},
 252         {Opt_umask, "umask=%o"},
 253         {Opt_case_lower, "case=lower"},
 254         {Opt_case_asis, "case=asis"},
 255         {Opt_check_none, "check=none"},
 256         {Opt_check_normal, "check=normal"},
 257         {Opt_check_strict, "check=strict"},
 258         {Opt_err_cont, "errors=continue"},
 259         {Opt_err_ro, "errors=remount-ro"},
 260         {Opt_err_panic, "errors=panic"},
 261         {Opt_eas_no, "eas=no"},
 262         {Opt_eas_ro, "eas=ro"},
 263         {Opt_eas_rw, "eas=rw"},
 264         {Opt_chkdsk_no, "chkdsk=no"},
 265         {Opt_chkdsk_errors, "chkdsk=errors"},
 266         {Opt_chkdsk_always, "chkdsk=always"},
 267         {Opt_timeshift, "timeshift=%d"},
 268         {Opt_err, NULL},
 269 };
 270
 271 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 272                       int *lowercase, int *eas, int *chk, int *errs,
 273                       int *chkdsk, int *timeshift)
 274 {
 275         char *p;
 276         int option;
 277
 278         if (!opts)
 279                 return 1;
 280
 281         /*printk("Parsing opts: '%s'\n",opts);*/
 282
 283         while ((p = strsep(&opts, ",")) != NULL) {
 284                 substring_t args[MAX_OPT_ARGS];
 285                 int token;
 286                 if (!*p)
 287                         continue;
 288
 289                 token = match_token(p, tokens, args);
 290                 switch (token) {
 291                 case Opt_help:
 292                         return 2;
 293                 case Opt_uid:
 294                         if (match_int(args, &option))
 295                                 return 0;
 296                         *uid = option;
 297                         break;
 298                 case Opt_gid:
 299                         if (match_int(args, &option))
 300                                 return 0;
 301                         *gid = option;
 302                         break;
 303                 case Opt_umask:
 304                         if (match_octal(args, &option))
 305                                 return 0;
 306                         *umask = option;
 307                         break;
 308                 case Opt_case_lower:
 309                         *lowercase = 1;
 310                         break;
 311                 case Opt_case_asis:
 312                         *lowercase = 0;
 313                         break;
 314                 case Opt_check_none:
 315                         *chk = 0;
 316                         break;
 317                 case Opt_check_normal:
 318                         *chk = 1;
 319                         break;
 320                 case Opt_check_strict:
 321                         *chk = 2;
 322                         break;
 323                 case Opt_err_cont:
 324                         *errs = 0;
 325                         break;
 326                 case Opt_err_ro:
 327                         *errs = 1;
 328                         break;
 329                 case Opt_err_panic:
 330                         *errs = 2;
 331                         break;
 332                 case Opt_eas_no:
 333                         *eas = 0;
 334                         break;
 335                 case Opt_eas_ro:
 336                         *eas = 1;
 337                         break;
 338                 case Opt_eas_rw:
 339                         *eas = 2;
 340                         break;
 341                 case Opt_chkdsk_no:
 342                         *chkdsk = 0;
 343                         break;
 344                 case Opt_chkdsk_errors:
 345                         *chkdsk = 1;
 346                         break;
 347                 case Opt_chkdsk_always:
 348                         *chkdsk = 2;
 349                         break;
 350                 case Opt_timeshift:
 351                 {
 352                         int m = 1;
 353                         char *rhs = args[0].from;
 354                         if (!rhs || !*rhs)
 355                                 return 0;
 356                         if (*rhs == '-') m = -1;
 357                         if (*rhs == '+' || *rhs == '-') rhs++;
 358                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 359                         if (*rhs)
 360                                 return 0;
 361                         break;
 362                 }
 363                 default:
 364                         return 0;
 365                 }
 366         }
 367         return 1;
 368 }
 369
 370 static inline void hpfs_help(void)
 371 {
 372         printk("\n\
 373 HPFS filesystem options:\n\
 374       help              do not mount and display this text\n\
 375       uid=xxx           set uid of files that don't have uid specified in eas\n\
 376       gid=xxx           set gid of files that don't have gid specified in eas\n\
 377       umask=xxx         set mode of files that don't have mode specified in eas\n\
 378       case=lower        lowercase all files\n\
 379       case=asis         do not lowercase files (default)\n\
 380       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 381       check=normal      do some checks - it should not crash (default)\n\
 382       check=strict      do extra time-consuming checks, used for debugging\n\
 383       errors=continue   continue on errors\n\
 384       errors=remount-ro remount read-only if errors found (default)\n\
 385       errors=panic      panic on errors\n\
 386       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 387       chkdsk=errors     mark fs dirty if errors found (default)\n\
 388       chkdsk=always     always mark fs dirty - used for debugging\n\
 389       eas=no            ignore extended attributes\n\
 390       eas=ro            read but do not write extended attributes\n\
 391       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 392       timeshift=nnn     add nnn seconds to file times\n\
 393 \n");
 394 }
 395
 396 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 397 {
 398         uid_t uid;
 399         gid_t gid;
 400         umode_t umask;
 401         int lowercase, eas, chk, errs, chkdsk, timeshift;
 402         int o;
 403         struct hpfs_sb_info *sbi = hpfs_sb(s);
 404         char *new_opts = kstrdup(data, GFP_KERNEL);
 405
 406         *flags |= MS_NOATIME;
 407
 408         hpfs_lock(s);
 409         lock_super(s);
 410         uid = sbi->sb_uid; gid = sbi->sb_gid;
 411         umask = 0777 & ~sbi->sb_mode;
 412         lowercase = sbi->sb_lowercase;
 413         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 414         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 415
 416         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 417             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 418                 printk("HPFS: bad mount options.\n");
 419                 goto out_err;
 420         }
 421         if (o == 2) {
 422                 hpfs_help();
 423                 goto out_err;
 424         }
 425         if (timeshift != sbi->sb_timeshift) {
 426                 printk("HPFS: timeshift can't be changed using remount.\n");
 427                 goto out_err;
 428         }
 429
 430         unmark_dirty(s);
 431
 432         sbi->sb_uid = uid; sbi->sb_gid = gid;
 433         sbi->sb_mode = 0777 & ~umask;
 434         sbi->sb_lowercase = lowercase;
 435         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 436         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 437
 438         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
 439
 440         replace_mount_options(s, new_opts);
 441
 442         unlock_super(s);
 443         hpfs_unlock(s);
 444         return 0;
 445
 446 out_err:
 447         unlock_super(s);
 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         uid_t uid;
 476         gid_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         sbi->sb_bmp_dir = NULL;
 495         sbi->sb_cp_table = NULL;
 496
 497         mutex_init(&sbi->hpfs_mutex);
 498         hpfs_lock(s);
 499
 500         uid = current_uid();
 501         gid = current_gid();
 502         umask = current_umask();
 503         lowercase = 0;
 504         eas = 2;
 505         chk = 1;
 506         errs = 1;
 507         chkdsk = 1;
 508         timeshift = 0;
 509
 510         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 511             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 512                 printk("HPFS: bad mount options.\n");
 513                 goto bail0;
 514         }
 515         if (o==2) {
 516                 hpfs_help();
 517                 goto bail0;
 518         }
 519
 520         /*sbi->sb_mounting = 1;*/
 521         sb_set_blocksize(s, 512);
 522         sbi->sb_fs_size = -1;
 523         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 524         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 525         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 526
 527         /* Check magics */
 528         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 529             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 530             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 531                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
 532                 goto bail4;
 533         }
 534
 535         /* Check version */
 536         if (!(s->s_flags & MS_RDONLY) &&
 537               superblock->funcversion != 2 && superblock->funcversion != 3) {
 538                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
 539                         (int)superblock->version, (int)superblock->funcversion);
 540                 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");
 541                 goto bail4;
 542         }
 543
 544         s->s_flags |= MS_NOATIME;
 545
 546         /* Fill superblock stuff */
 547         s->s_magic = HPFS_SUPER_MAGIC;
 548         s->s_op = &hpfs_sops;
 549         s->s_d_op = &hpfs_dentry_operations;
 550
 551         sbi->sb_root = le32_to_cpu(superblock->root);
 552         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 553         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 554         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 555         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 556         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 557         sbi->sb_uid = uid;
 558         sbi->sb_gid = gid;
 559         sbi->sb_mode = 0777 & ~umask;
 560         sbi->sb_n_free = -1;
 561         sbi->sb_n_free_dnodes = -1;
 562         sbi->sb_lowercase = lowercase;
 563         sbi->sb_eas = eas;
 564         sbi->sb_chk = chk;
 565         sbi->sb_chkdsk = chkdsk;
 566         sbi->sb_err = errs;
 567         sbi->sb_timeshift = timeshift;
 568         sbi->sb_was_error = 0;
 569         sbi->sb_cp_table = NULL;
 570         sbi->sb_c_bitmap = -1;
 571         sbi->sb_max_fwd_alloc = 0xffffff;
 572
 573         if (sbi->sb_fs_size >= 0x80000000) {
 574                 hpfs_error(s, "invalid size in superblock: %08x",
 575                         (unsigned)sbi->sb_fs_size);
 576                 goto bail4;
 577         }
 578
 579         /* Load bitmap directory */
 580         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 581                 goto bail4;
 582
 583         /* Check for general fs errors*/
 584         if (spareblock->dirty && !spareblock->old_wrote) {
 585                 if (errs == 2) {
 586                         printk("HPFS: Improperly stopped, not mounted\n");
 587                         goto bail4;
 588                 }
 589                 hpfs_error(s, "improperly stopped");
 590         }
 591
 592         if (!(s->s_flags & MS_RDONLY)) {
 593                 spareblock->dirty = 1;
 594                 spareblock->old_wrote = 0;
 595                 mark_buffer_dirty(bh2);
 596         }
 597
 598         if (le32_to_cpu(spareblock->hotfixes_used) || le32_to_cpu(spareblock->n_spares_used)) {
 599                 if (errs >= 2) {
 600                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 601                         mark_dirty(s, 0);
 602                         goto bail4;
 603                 }
 604                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 605                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 606                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 607         }
 608         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 609                 if (errs >= 2) {
 610                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 611                         mark_dirty(s, 0);
 612                         goto bail4;
 613                 }
 614                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 615                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 616         }
 617         if (chk) {
 618                 unsigned a;
 619                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 620                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 621                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 622                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 623                         goto bail4;
 624                 }
 625                 a = sbi->sb_dirband_size;
 626                 sbi->sb_dirband_size = 0;
 627                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 628                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 629                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 630                         mark_dirty(s, 0);
 631                         goto bail4;
 632                 }
 633                 sbi->sb_dirband_size = a;
 634         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 635
 636         /* Load code page table */
 637         if (le32_to_cpu(spareblock->n_code_pages))
 638                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 639                         printk("HPFS: Warning: code page support is disabled\n");
 640
 641         brelse(bh2);
 642         brelse(bh1);
 643         brelse(bh0);
 644
 645         root = iget_locked(s, sbi->sb_root);
 646         if (!root)
 647                 goto bail0;
 648         hpfs_init_inode(root);
 649         hpfs_read_inode(root);
 650         unlock_new_inode(root);
 651         s->s_root = d_alloc_root(root);
 652         if (!s->s_root) {
 653                 iput(root);
 654                 goto bail0;
 655         }
 656
 657         /*
 658          * find the root directory's . pointer & finish filling in the inode
 659          */
 660
 661         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 662         if (root_dno)
 663                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 664         if (!de)
 665                 hpfs_error(s, "unable to find root dir");
 666         else {
 667                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 668                 root->i_atime.tv_nsec = 0;
 669                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 670                 root->i_mtime.tv_nsec = 0;
 671                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 672                 root->i_ctime.tv_nsec = 0;
 673                 hpfs_i(root)->i_ea_size = le16_to_cpu(de->ea_size);
 674                 hpfs_i(root)->i_parent_dir = root->i_ino;
 675                 if (root->i_size == -1)
 676                         root->i_size = 2048;
 677                 if (root->i_blocks == -1)
 678                         root->i_blocks = 5;
 679                 hpfs_brelse4(&qbh);
 680         }
 681         hpfs_unlock(s);
 682         return 0;
 683
 684 bail4:  brelse(bh2);
 685 bail3:  brelse(bh1);
 686 bail2:  brelse(bh0);
 687 bail1:
 688 bail0:
 689         hpfs_unlock(s);
 690         kfree(sbi->sb_bmp_dir);
 691         kfree(sbi->sb_cp_table);
 692         s->s_fs_info = NULL;
 693         kfree(sbi);
 694         return -EINVAL;
 695 }
 696
 697 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 698         int flags, const char *dev_name, void *data)
 699 {
 700         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 701 }
 702
 703 static struct file_system_type hpfs_fs_type = {
 704         .owner          = THIS_MODULE,
 705         .name           = "hpfs",
 706         .mount          = hpfs_mount,
 707         .kill_sb        = kill_block_super,
 708         .fs_flags       = FS_REQUIRES_DEV,
 709 };
 710
 711 static int __init init_hpfs_fs(void)
 712 {
 713         int err = init_inodecache();
 714         if (err)
 715                 goto out1;
 716         err = register_filesystem(&hpfs_fs_type);
 717         if (err)
 718                 goto out;
 719         return 0;
 720 out:
 721         destroy_inodecache();
 722 out1:
 723         return err;
 724 }
 725
 726 static void __exit exit_hpfs_fs(void)
 727 {
 728         unregister_filesystem(&hpfs_fs_type);
 729         destroy_inodecache();
 730 }
 731
 732 module_init(init_hpfs_fs)
 733 module_exit(exit_hpfs_fs)
 734 MODULE_LICENSE("GPL");