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)
  22 {
  23         if (hpfs_sb(s)->sb_chkdsk && !(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                         brelse(bh);
  31                 }
  32         }
  33 }
  34
  35 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
  36    were errors) */
  37
  38 static void unmark_dirty(struct super_block *s)
  39 {
  40         struct buffer_head *bh;
  41         struct hpfs_spare_block *sb;
  42         if (s->s_flags & MS_RDONLY) return;
  43         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  44                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
  45                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
  46                 mark_buffer_dirty(bh);
  47                 brelse(bh);
  48         }
  49 }
  50
  51 /* Filesystem error... */
  52 static char err_buf[1024];
  53
  54 void hpfs_error(struct super_block *s, const char *fmt, ...)
  55 {
  56         va_list args;
  57
  58         va_start(args, fmt);
  59         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
  60         va_end(args);
  61
  62         printk("HPFS: filesystem error: %s", err_buf);
  63         if (!hpfs_sb(s)->sb_was_error) {
  64                 if (hpfs_sb(s)->sb_err == 2) {
  65                         printk("; crashing the system because you wanted it\n");
  66                         mark_dirty(s);
  67                         panic("HPFS panic");
  68                 } else if (hpfs_sb(s)->sb_err == 1) {
  69                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
  70                         else {
  71                                 printk("; remounting read-only\n");
  72                                 mark_dirty(s);
  73                                 s->s_flags |= MS_RDONLY;
  74                         }
  75                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
  76                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  77         } else printk("\n");
  78         hpfs_sb(s)->sb_was_error = 1;
  79 }
  80
  81 /*
  82  * A little trick to detect cycles in many hpfs structures and don't let the
  83  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  84  *
  85  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  86  * nested each in other, chkdsk locked up happilly.
  87  */
  88
  89 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
  90                 char *msg)
  91 {
  92         if (*c2 && *c1 == key) {
  93                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
  94                 return 1;
  95         }
  96         (*c2)++;
  97         if (!((*c2 - 1) & *c2)) *c1 = key;
  98         return 0;
  99 }
 100
 101 static void hpfs_put_super(struct super_block *s)
 102 {
 103         struct hpfs_sb_info *sbi = hpfs_sb(s);
 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
 112 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 113 {
 114         struct quad_buffer_head qbh;
 115         unsigned long *bits;
 116         unsigned count;
 117
 118         bits = hpfs_map_4sectors(s, secno, &qbh, 4);
 119         if (!bits)
 120                 return 0;
 121         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 122         hpfs_brelse4(&qbh);
 123         return count;
 124 }
 125
 126 static unsigned count_bitmaps(struct super_block *s)
 127 {
 128         unsigned n, count, n_bands;
 129         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 130         count = 0;
 131         for (n = 0; n < n_bands; n++)
 132                 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
 133         return count;
 134 }
 135
 136 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 137 {
 138         struct super_block *s = dentry->d_sb;
 139         struct hpfs_sb_info *sbi = hpfs_sb(s);
 140         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 141         hpfs_lock(s);
 142
 143         /*if (sbi->sb_n_free == -1) {*/
 144                 sbi->sb_n_free = count_bitmaps(s);
 145                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 146         /*}*/
 147         buf->f_type = s->s_magic;
 148         buf->f_bsize = 512;
 149         buf->f_blocks = sbi->sb_fs_size;
 150         buf->f_bfree = sbi->sb_n_free;
 151         buf->f_bavail = sbi->sb_n_free;
 152         buf->f_files = sbi->sb_dirband_size / 4;
 153         buf->f_ffree = sbi->sb_n_free_dnodes;
 154         buf->f_fsid.val[0] = (u32)id;
 155         buf->f_fsid.val[1] = (u32)(id >> 32);
 156         buf->f_namelen = 254;
 157
 158         hpfs_unlock(s);
 159
 160         return 0;
 161 }
 162
 163 static struct kmem_cache * hpfs_inode_cachep;
 164
 165 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 166 {
 167         struct hpfs_inode_info *ei;
 168         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 169         if (!ei)
 170                 return NULL;
 171         ei->vfs_inode.i_version = 1;
 172         return &ei->vfs_inode;
 173 }
 174
 175 static void hpfs_i_callback(struct rcu_head *head)
 176 {
 177         struct inode *inode = container_of(head, struct inode, i_rcu);
 178         INIT_LIST_HEAD(&inode->i_dentry);
 179         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 180 }
 181
 182 static void hpfs_destroy_inode(struct inode *inode)
 183 {
 184         call_rcu(&inode->i_rcu, hpfs_i_callback);
 185 }
 186
 187 static void init_once(void *foo)
 188 {
 189         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 190
 191         mutex_init(&ei->i_mutex);
 192         mutex_init(&ei->i_parent_mutex);
 193         inode_init_once(&ei->vfs_inode);
 194 }
 195
 196 static int init_inodecache(void)
 197 {
 198         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 199                                              sizeof(struct hpfs_inode_info),
 200                                              0, (SLAB_RECLAIM_ACCOUNT|
 201                                                 SLAB_MEM_SPREAD),
 202                                              init_once);
 203         if (hpfs_inode_cachep == NULL)
 204                 return -ENOMEM;
 205         return 0;
 206 }
 207
 208 static void destroy_inodecache(void)
 209 {
 210         kmem_cache_destroy(hpfs_inode_cachep);
 211 }
 212
 213 /*
 214  * A tiny parser for option strings, stolen from dosfs.
 215  * Stolen again from read-only hpfs.
 216  * And updated for table-driven option parsing.
 217  */
 218
 219 enum {
 220         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 221         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
 222         Opt_check_none, Opt_check_normal, Opt_check_strict,
 223         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 224         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 225         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 226         Opt_timeshift, Opt_err,
 227 };
 228
 229 static const match_table_t tokens = {
 230         {Opt_help, "help"},
 231         {Opt_uid, "uid=%u"},
 232         {Opt_gid, "gid=%u"},
 233         {Opt_umask, "umask=%o"},
 234         {Opt_case_lower, "case=lower"},
 235         {Opt_case_asis, "case=asis"},
 236         {Opt_conv_binary, "conv=binary"},
 237         {Opt_conv_text, "conv=text"},
 238         {Opt_conv_auto, "conv=auto"},
 239         {Opt_check_none, "check=none"},
 240         {Opt_check_normal, "check=normal"},
 241         {Opt_check_strict, "check=strict"},
 242         {Opt_err_cont, "errors=continue"},
 243         {Opt_err_ro, "errors=remount-ro"},
 244         {Opt_err_panic, "errors=panic"},
 245         {Opt_eas_no, "eas=no"},
 246         {Opt_eas_ro, "eas=ro"},
 247         {Opt_eas_rw, "eas=rw"},
 248         {Opt_chkdsk_no, "chkdsk=no"},
 249         {Opt_chkdsk_errors, "chkdsk=errors"},
 250         {Opt_chkdsk_always, "chkdsk=always"},
 251         {Opt_timeshift, "timeshift=%d"},
 252         {Opt_err, NULL},
 253 };
 254
 255 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 256                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
 257                       int *chkdsk, int *timeshift)
 258 {
 259         char *p;
 260         int option;
 261
 262         if (!opts)
 263                 return 1;
 264
 265         /*printk("Parsing opts: '%s'\n",opts);*/
 266
 267         while ((p = strsep(&opts, ",")) != NULL) {
 268                 substring_t args[MAX_OPT_ARGS];
 269                 int token;
 270                 if (!*p)
 271                         continue;
 272
 273                 token = match_token(p, tokens, args);
 274                 switch (token) {
 275                 case Opt_help:
 276                         return 2;
 277                 case Opt_uid:
 278                         if (match_int(args, &option))
 279                                 return 0;
 280                         *uid = option;
 281                         break;
 282                 case Opt_gid:
 283                         if (match_int(args, &option))
 284                                 return 0;
 285                         *gid = option;
 286                         break;
 287                 case Opt_umask:
 288                         if (match_octal(args, &option))
 289                                 return 0;
 290                         *umask = option;
 291                         break;
 292                 case Opt_case_lower:
 293                         *lowercase = 1;
 294                         break;
 295                 case Opt_case_asis:
 296                         *lowercase = 0;
 297                         break;
 298                 case Opt_conv_binary:
 299                         *conv = CONV_BINARY;
 300                         break;
 301                 case Opt_conv_text:
 302                         *conv = CONV_TEXT;
 303                         break;
 304                 case Opt_conv_auto:
 305                         *conv = CONV_AUTO;
 306                         break;
 307                 case Opt_check_none:
 308                         *chk = 0;
 309                         break;
 310                 case Opt_check_normal:
 311                         *chk = 1;
 312                         break;
 313                 case Opt_check_strict:
 314                         *chk = 2;
 315                         break;
 316                 case Opt_err_cont:
 317                         *errs = 0;
 318                         break;
 319                 case Opt_err_ro:
 320                         *errs = 1;
 321                         break;
 322                 case Opt_err_panic:
 323                         *errs = 2;
 324                         break;
 325                 case Opt_eas_no:
 326                         *eas = 0;
 327                         break;
 328                 case Opt_eas_ro:
 329                         *eas = 1;
 330                         break;
 331                 case Opt_eas_rw:
 332                         *eas = 2;
 333                         break;
 334                 case Opt_chkdsk_no:
 335                         *chkdsk = 0;
 336                         break;
 337                 case Opt_chkdsk_errors:
 338                         *chkdsk = 1;
 339                         break;
 340                 case Opt_chkdsk_always:
 341                         *chkdsk = 2;
 342                         break;
 343                 case Opt_timeshift:
 344                 {
 345                         int m = 1;
 346                         char *rhs = args[0].from;
 347                         if (!rhs || !*rhs)
 348                                 return 0;
 349                         if (*rhs == '-') m = -1;
 350                         if (*rhs == '+' || *rhs == '-') rhs++;
 351                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 352                         if (*rhs)
 353                                 return 0;
 354                         break;
 355                 }
 356                 default:
 357                         return 0;
 358                 }
 359         }
 360         return 1;
 361 }
 362
 363 static inline void hpfs_help(void)
 364 {
 365         printk("\n\
 366 HPFS filesystem options:\n\
 367       help              do not mount and display this text\n\
 368       uid=xxx           set uid of files that don't have uid specified in eas\n\
 369       gid=xxx           set gid of files that don't have gid specified in eas\n\
 370       umask=xxx         set mode of files that don't have mode specified in eas\n\
 371       case=lower        lowercase all files\n\
 372       case=asis         do not lowercase files (default)\n\
 373       conv=binary       do not convert CR/LF -> LF (default)\n\
 374       conv=auto         convert only files with known text extensions\n\
 375       conv=text         convert all files\n\
 376       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 377       check=normal      do some checks - it should not crash (default)\n\
 378       check=strict      do extra time-consuming checks, used for debugging\n\
 379       errors=continue   continue on errors\n\
 380       errors=remount-ro remount read-only if errors found (default)\n\
 381       errors=panic      panic on errors\n\
 382       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 383       chkdsk=errors     mark fs dirty if errors found (default)\n\
 384       chkdsk=always     always mark fs dirty - used for debugging\n\
 385       eas=no            ignore extended attributes\n\
 386       eas=ro            read but do not write extended attributes\n\
 387       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 388       timeshift=nnn     add nnn seconds to file times\n\
 389 \n");
 390 }
 391
 392 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 393 {
 394         uid_t uid;
 395         gid_t gid;
 396         umode_t umask;
 397         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 398         int o;
 399         struct hpfs_sb_info *sbi = hpfs_sb(s);
 400         char *new_opts = kstrdup(data, GFP_KERNEL);
 401
 402         *flags |= MS_NOATIME;
 403
 404         hpfs_lock(s);
 405         lock_super(s);
 406         uid = sbi->sb_uid; gid = sbi->sb_gid;
 407         umask = 0777 & ~sbi->sb_mode;
 408         lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
 409         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 410         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 411
 412         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
 413             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 414                 printk("HPFS: bad mount options.\n");
 415                 goto out_err;
 416         }
 417         if (o == 2) {
 418                 hpfs_help();
 419                 goto out_err;
 420         }
 421         if (timeshift != sbi->sb_timeshift) {
 422                 printk("HPFS: timeshift can't be changed using remount.\n");
 423                 goto out_err;
 424         }
 425
 426         unmark_dirty(s);
 427
 428         sbi->sb_uid = uid; sbi->sb_gid = gid;
 429         sbi->sb_mode = 0777 & ~umask;
 430         sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
 431         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 432         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 433
 434         if (!(*flags & MS_RDONLY)) mark_dirty(s);
 435
 436         replace_mount_options(s, new_opts);
 437
 438         unlock_super(s);
 439         hpfs_unlock(s);
 440         return 0;
 441
 442 out_err:
 443         unlock_super(s);
 444         hpfs_unlock(s);
 445         kfree(new_opts);
 446         return -EINVAL;
 447 }
 448
 449 /* Super operations */
 450
 451 static const struct super_operations hpfs_sops =
 452 {
 453         .alloc_inode    = hpfs_alloc_inode,
 454         .destroy_inode  = hpfs_destroy_inode,
 455         .evict_inode    = hpfs_evict_inode,
 456         .put_super      = hpfs_put_super,
 457         .statfs         = hpfs_statfs,
 458         .remount_fs     = hpfs_remount_fs,
 459         .show_options   = generic_show_options,
 460 };
 461
 462 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 463 {
 464         struct buffer_head *bh0, *bh1, *bh2;
 465         struct hpfs_boot_block *bootblock;
 466         struct hpfs_super_block *superblock;
 467         struct hpfs_spare_block *spareblock;
 468         struct hpfs_sb_info *sbi;
 469         struct inode *root;
 470
 471         uid_t uid;
 472         gid_t gid;
 473         umode_t umask;
 474         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 475
 476         dnode_secno root_dno;
 477         struct hpfs_dirent *de = NULL;
 478         struct quad_buffer_head qbh;
 479
 480         int o;
 481
 482         if (num_possible_cpus() > 1) {
 483                 printk(KERN_ERR "HPFS is not SMP safe\n");
 484                 return -EINVAL;
 485         }
 486
 487         save_mount_options(s, options);
 488
 489         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 490         if (!sbi) {
 491                 return -ENOMEM;
 492         }
 493         s->s_fs_info = sbi;
 494
 495         sbi->sb_bmp_dir = NULL;
 496         sbi->sb_cp_table = NULL;
 497
 498         mutex_init(&sbi->hpfs_creation_de);
 499
 500         uid = current_uid();
 501         gid = current_gid();
 502         umask = current_umask();
 503         lowercase = 0;
 504         conv = CONV_BINARY;
 505         eas = 2;
 506         chk = 1;
 507         errs = 1;
 508         chkdsk = 1;
 509         timeshift = 0;
 510
 511         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
 512             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 513                 printk("HPFS: bad mount options.\n");
 514                 goto bail0;
 515         }
 516         if (o==2) {
 517                 hpfs_help();
 518                 goto bail0;
 519         }
 520
 521         /*sbi->sb_mounting = 1;*/
 522         sb_set_blocksize(s, 512);
 523         sbi->sb_fs_size = -1;
 524         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 525         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 526         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 527
 528         /* Check magics */
 529         if (/*bootblock->magic != BB_MAGIC
 530             ||*/ superblock->magic != SB_MAGIC
 531             || spareblock->magic != SP_MAGIC) {
 532                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
 533                 goto bail4;
 534         }
 535
 536         /* Check version */
 537         if (!(s->s_flags & MS_RDONLY) &&
 538               superblock->funcversion != 2 && superblock->funcversion != 3) {
 539                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
 540                         (int)superblock->version, (int)superblock->funcversion);
 541                 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");
 542                 goto bail4;
 543         }
 544
 545         s->s_flags |= MS_NOATIME;
 546
 547         /* Fill superblock stuff */
 548         s->s_magic = HPFS_SUPER_MAGIC;
 549         s->s_op = &hpfs_sops;
 550         s->s_d_op = &hpfs_dentry_operations;
 551
 552         sbi->sb_root = superblock->root;
 553         sbi->sb_fs_size = superblock->n_sectors;
 554         sbi->sb_bitmaps = superblock->bitmaps;
 555         sbi->sb_dirband_start = superblock->dir_band_start;
 556         sbi->sb_dirband_size = superblock->n_dir_band;
 557         sbi->sb_dmap = superblock->dir_band_bitmap;
 558         sbi->sb_uid = uid;
 559         sbi->sb_gid = gid;
 560         sbi->sb_mode = 0777 & ~umask;
 561         sbi->sb_n_free = -1;
 562         sbi->sb_n_free_dnodes = -1;
 563         sbi->sb_lowercase = lowercase;
 564         sbi->sb_conv = conv;
 565         sbi->sb_eas = eas;
 566         sbi->sb_chk = chk;
 567         sbi->sb_chkdsk = chkdsk;
 568         sbi->sb_err = errs;
 569         sbi->sb_timeshift = timeshift;
 570         sbi->sb_was_error = 0;
 571         sbi->sb_cp_table = NULL;
 572         sbi->sb_c_bitmap = -1;
 573         sbi->sb_max_fwd_alloc = 0xffffff;
 574
 575         /* Load bitmap directory */
 576         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
 577                 goto bail4;
 578
 579         /* Check for general fs errors*/
 580         if (spareblock->dirty && !spareblock->old_wrote) {
 581                 if (errs == 2) {
 582                         printk("HPFS: Improperly stopped, not mounted\n");
 583                         goto bail4;
 584                 }
 585                 hpfs_error(s, "improperly stopped");
 586         }
 587
 588         if (!(s->s_flags & MS_RDONLY)) {
 589                 spareblock->dirty = 1;
 590                 spareblock->old_wrote = 0;
 591                 mark_buffer_dirty(bh2);
 592         }
 593
 594         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 595                 if (errs >= 2) {
 596                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 597                         mark_dirty(s);
 598                         goto bail4;
 599                 }
 600                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 601                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 602                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 603         }
 604         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
 605                 if (errs >= 2) {
 606                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 607                         mark_dirty(s);
 608                         goto bail4;
 609                 }
 610                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 611                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 612         }
 613         if (chk) {
 614                 unsigned a;
 615                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
 616                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
 617                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 618                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
 619                         goto bail4;
 620                 }
 621                 a = sbi->sb_dirband_size;
 622                 sbi->sb_dirband_size = 0;
 623                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
 624                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
 625                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
 626                         mark_dirty(s);
 627                         goto bail4;
 628                 }
 629                 sbi->sb_dirband_size = a;
 630         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 631
 632         /* Load code page table */
 633         if (spareblock->n_code_pages)
 634                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
 635                         printk("HPFS: Warning: code page support is disabled\n");
 636
 637         brelse(bh2);
 638         brelse(bh1);
 639         brelse(bh0);
 640
 641         root = iget_locked(s, sbi->sb_root);
 642         if (!root)
 643                 goto bail0;
 644         hpfs_init_inode(root);
 645         hpfs_read_inode(root);
 646         unlock_new_inode(root);
 647         s->s_root = d_alloc_root(root);
 648         if (!s->s_root) {
 649                 iput(root);
 650                 goto bail0;
 651         }
 652
 653         /*
 654          * find the root directory's . pointer & finish filling in the inode
 655          */
 656
 657         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 658         if (root_dno)
 659                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 660         if (!de)
 661                 hpfs_error(s, "unable to find root dir");
 662         else {
 663                 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
 664                 root->i_atime.tv_nsec = 0;
 665                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
 666                 root->i_mtime.tv_nsec = 0;
 667                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
 668                 root->i_ctime.tv_nsec = 0;
 669                 hpfs_i(root)->i_ea_size = de->ea_size;
 670                 hpfs_i(root)->i_parent_dir = root->i_ino;
 671                 if (root->i_size == -1)
 672                         root->i_size = 2048;
 673                 if (root->i_blocks == -1)
 674                         root->i_blocks = 5;
 675                 hpfs_brelse4(&qbh);
 676         }
 677         return 0;
 678
 679 bail4:  brelse(bh2);
 680 bail3:  brelse(bh1);
 681 bail2:  brelse(bh0);
 682 bail1:
 683 bail0:
 684         kfree(sbi->sb_bmp_dir);
 685         kfree(sbi->sb_cp_table);
 686         s->s_fs_info = NULL;
 687         kfree(sbi);
 688         return -EINVAL;
 689 }
 690
 691 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 692         int flags, const char *dev_name, void *data)
 693 {
 694         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 695 }
 696
 697 static struct file_system_type hpfs_fs_type = {
 698         .owner          = THIS_MODULE,
 699         .name           = "hpfs",
 700         .mount          = hpfs_mount,
 701         .kill_sb        = kill_block_super,
 702         .fs_flags       = FS_REQUIRES_DEV,
 703 };
 704
 705 static int __init init_hpfs_fs(void)
 706 {
 707         int err = init_inodecache();
 708         if (err)
 709                 goto out1;
 710         err = register_filesystem(&hpfs_fs_type);
 711         if (err)
 712                 goto out;
 713         return 0;
 714 out:
 715         destroy_inodecache();
 716 out1:
 717         return err;
 718 }
 719
 720 static void __exit exit_hpfs_fs(void)
 721 {
 722         unregister_filesystem(&hpfs_fs_type);
 723         destroy_inodecache();
 724 }
 725
 726 module_init(init_hpfs_fs)
 727 module_exit(exit_hpfs_fs)
 728 MODULE_LICENSE("GPL");