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  *  mouning, unmounting, error handling
   7  */
   8
   9 #include <linux/string.h>
  10 #include "hpfs_fn.h"
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13
  14 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
  15
  16 static void mark_dirty(struct super_block *s)
  17 {
  18         if (s->s_hpfs_chkdsk && !(s->s_flags & MS_RDONLY)) {
  19                 struct buffer_head *bh;
  20                 struct hpfs_spare_block *sb;
  21                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  22                         sb->dirty = 1;
  23                         sb->old_wrote = 0;
  24                         mark_buffer_dirty(bh);
  25                         brelse(bh);
  26                 }
  27         }
  28 }
  29
  30 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
  31    were errors) */
  32
  33 static void unmark_dirty(struct super_block *s)
  34 {
  35         struct buffer_head *bh;
  36         struct hpfs_spare_block *sb;
  37         if (s->s_flags & MS_RDONLY) return;
  38         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  39                 sb->dirty = s->s_hpfs_chkdsk > 1 - s->s_hpfs_was_error;
  40                 sb->old_wrote = s->s_hpfs_chkdsk >= 2 && !s->s_hpfs_was_error;
  41                 mark_buffer_dirty(bh);
  42                 brelse(bh);
  43         }
  44 }
  45
  46 /* Filesystem error... */
  47
  48 #define ERR_BUF_SIZE 1024
  49
  50 void hpfs_error(struct super_block *s, char *m,...)
  51 {
  52         char *buf;
  53         va_list l;
  54         va_start(l, m);
  55         if (!(buf = kmalloc(ERR_BUF_SIZE, GFP_KERNEL)))
  56                 printk("HPFS: No memory for error message '%s'\n",m);
  57         else if (vsprintf(buf, m, l) >= ERR_BUF_SIZE)
  58                 printk("HPFS: Grrrr... Kernel memory corrupted ... going on, but it'll crash very soon :-(\n");
  59         printk("HPFS: filesystem error: ");
  60         if (buf) printk("%s", buf);
  61         else printk("%s\n",m);
  62         if (!s->s_hpfs_was_error) {
  63                 if (s->s_hpfs_err == 2) {
  64                         printk("; crashing the system because you wanted it\n");
  65                         mark_dirty(s);
  66                         panic("HPFS panic");
  67                 } else if (s->s_hpfs_err == 1) {
  68                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
  69                         else {
  70                                 printk("; remounting read-only\n");
  71                                 mark_dirty(s);
  72                                 s->s_flags |= MS_RDONLY;
  73                         }
  74                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
  75                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  76         } else printk("\n");
  77         if (buf) kfree(buf);
  78         s->s_hpfs_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 void hpfs_put_super(struct super_block *s)
 102 {
 103         if (s->s_hpfs_cp_table) kfree(s->s_hpfs_cp_table);
 104         if (s->s_hpfs_bmp_dir) kfree(s->s_hpfs_bmp_dir);
 105         unmark_dirty(s);
 106 }
 107
 108 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 109 {
 110         struct quad_buffer_head qbh;
 111         unsigned *bits;
 112         unsigned i, count;
 113         if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
 114         count = 0;
 115         for (i = 0; i < 2048 / sizeof(unsigned); i++) {
 116                 unsigned b;
 117                 if (!bits[i]) continue;
 118                 for (b = bits[i]; b; b>>=1) count += b & 1;
 119         }
 120         hpfs_brelse4(&qbh);
 121         return count;
 122 }
 123
 124 static unsigned count_bitmaps(struct super_block *s)
 125 {
 126         unsigned n, count, n_bands;
 127         n_bands = (s->s_hpfs_fs_size + 0x3fff) >> 14;
 128         count = 0;
 129         for (n = 0; n < n_bands; n++)
 130                 count += hpfs_count_one_bitmap(s, s->s_hpfs_bmp_dir[n]);
 131         return count;
 132 }
 133
 134 int hpfs_statfs(struct super_block *s, struct statfs *buf)
 135 {
 136         /*if (s->s_hpfs_n_free == -1) {*/
 137                 s->s_hpfs_n_free = count_bitmaps(s);
 138                 s->s_hpfs_n_free_dnodes = hpfs_count_one_bitmap(s, s->s_hpfs_dmap);
 139         /*}*/
 140         buf->f_type = s->s_magic;
 141         buf->f_bsize = 512;
 142         buf->f_blocks = s->s_hpfs_fs_size;
 143         buf->f_bfree = s->s_hpfs_n_free;
 144         buf->f_bavail = s->s_hpfs_n_free;
 145         buf->f_files = s->s_hpfs_dirband_size / 4;
 146         buf->f_ffree = s->s_hpfs_n_free_dnodes;
 147         buf->f_namelen = 254;
 148         return 0;
 149 }
 150
 151 /* Super operations */
 152
 153 static struct super_operations hpfs_sops =
 154 {
 155         read_inode:     hpfs_read_inode,
 156         delete_inode:   hpfs_delete_inode,
 157         put_super:      hpfs_put_super,
 158         statfs:         hpfs_statfs,
 159         remount_fs:     hpfs_remount_fs,
 160 };
 161
 162 /*
 163  * A tiny parser for option strings, stolen from dosfs.
 164  *
 165  * Stolen again from read-only hpfs.
 166  */
 167
 168 int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 169                int *lowercase, int *conv, int *eas, int *chk, int *errs,
 170                int *chkdsk, int *timeshift)
 171 {
 172         char *p, *rhs;
 173
 174         if (!opts)
 175                 return 1;
 176
 177         /*printk("Parsing opts: '%s'\n",opts);*/
 178
 179         for (p = strtok(opts, ","); p != 0; p = strtok(0, ",")) {
 180                 if ((rhs = strchr(p, '=')) != 0)
 181                         *rhs++ = '\0';
 182                 if (!strcmp(p, "help")) return 2;
 183                 if (!strcmp(p, "uid")) {
 184                         if (!rhs || !*rhs)
 185                                 return 0;
 186                         *uid = simple_strtoul(rhs, &rhs, 0);
 187                         if (*rhs)
 188                                 return 0;
 189                 }
 190                 else if (!strcmp(p, "gid")) {
 191                         if (!rhs || !*rhs)
 192                                 return 0;
 193                         *gid = simple_strtoul(rhs, &rhs, 0);
 194                         if (*rhs)
 195                                 return 0;
 196                 }
 197                 else if (!strcmp(p, "umask")) {
 198                         if (!rhs || !*rhs)
 199                                 return 0;
 200                         *umask = simple_strtoul(rhs, &rhs, 8);
 201                         if (*rhs)
 202                                 return 0;
 203                 }
 204                 else if (!strcmp(p, "timeshift")) {
 205                         int m = 1;
 206                         if (!rhs || !*rhs)
 207                                 return 0;
 208                         if (*rhs == '-') m = -1;
 209                         if (*rhs == '+' || *rhs == '-') rhs++;
 210                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 211                         if (*rhs)
 212                                 return 0;
 213                 }
 214                 else if (!strcmp(p, "case")) {
 215                         if (!strcmp(rhs, "lower"))
 216                                 *lowercase = 1;
 217                         else if (!strcmp(rhs, "asis"))
 218                                 *lowercase = 0;
 219                         else
 220                                 return 0;
 221                 }
 222                 else if (!strcmp(p, "conv")) {
 223                         if (!strcmp(rhs, "binary"))
 224                                 *conv = CONV_BINARY;
 225                         else if (!strcmp(rhs, "text"))
 226                                 *conv = CONV_TEXT;
 227                         else if (!strcmp(rhs, "auto"))
 228                                 *conv = CONV_AUTO;
 229                         else
 230                                 return 0;
 231                 }
 232                 else if (!strcmp(p, "check")) {
 233                         if (!strcmp(rhs, "none"))
 234                                 *chk = 0;
 235                         else if (!strcmp(rhs, "normal"))
 236                                 *chk = 1;
 237                         else if (!strcmp(rhs, "strict"))
 238                                 *chk = 2;
 239                         else
 240                                 return 0;
 241                 }
 242                 else if (!strcmp(p, "errors")) {
 243                         if (!strcmp(rhs, "continue"))
 244                                 *errs = 0;
 245                         else if (!strcmp(rhs, "remount-ro"))
 246                                 *errs = 1;
 247                         else if (!strcmp(rhs, "panic"))
 248                                 *errs = 2;
 249                         else
 250                                 return 0;
 251                 }
 252                 else if (!strcmp(p, "eas")) {
 253                         if (!strcmp(rhs, "no"))
 254                                 *eas = 0;
 255                         else if (!strcmp(rhs, "ro"))
 256                                 *eas = 1;
 257                         else if (!strcmp(rhs, "rw"))
 258                                 *eas = 2;
 259                         else
 260                                 return 0;
 261                 }
 262                 else if (!strcmp(p, "chkdsk")) {
 263                         if (!strcmp(rhs, "no"))
 264                                 *chkdsk = 0;
 265                         else if (!strcmp(rhs, "errors"))
 266                                 *chkdsk = 1;
 267                         else if (!strcmp(rhs, "always"))
 268                                 *chkdsk = 2;
 269                         else
 270                                 return 0;
 271                 }
 272                 else
 273                         return 0;
 274         }
 275         return 1;
 276 }
 277
 278 static inline void hpfs_help(void)
 279 {
 280         printk("\n\
 281 HPFS filesystem options:\n\
 282       help              do not mount and display this text\n\
 283       uid=xxx           set uid of files that don't have uid specified in eas\n\
 284       gid=xxx           set gid of files that don't have gid specified in eas\n\
 285       umask=xxx         set mode of files that don't have mode specified in eas\n\
 286       case=lower        lowercase all files\n\
 287       case=asis         do not lowercase files (default)\n\
 288       conv=binary       do not convert CR/LF -> LF (default)\n\
 289       conv=auto         convert only files with known text extensions\n\
 290       conv=text         convert all files\n\
 291       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 292       check=normal      do some checks - it should not crash (default)\n\
 293       check=strict      do extra time-consuming checks, used for debugging\n\
 294       errors=continue   continue on errors\n\
 295       errors=remount-ro remount read-only if errors found (default)\n\
 296       errors=panic      panic on errors\n\
 297       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 298       chkdsk=errors     mark fs dirty if errors found (default)\n\
 299       chkdsk=always     always mark fs dirty - used for debugging\n\
 300       eas=no            ignore extended attributes\n\
 301       eas=ro            read but do not write extended attributes\n\
 302       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 303       timeshift=nnn     add nnn seconds to file times\n\
 304 \n");
 305 }
 306
 307 int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 308 {
 309         uid_t uid;
 310         gid_t gid;
 311         umode_t umask;
 312         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 313         int o;
 314
 315         *flags |= MS_NOATIME;
 316
 317         uid = s->s_hpfs_uid; gid = s->s_hpfs_gid;
 318         umask = 0777 & ~s->s_hpfs_mode;
 319         lowercase = s->s_hpfs_lowercase; conv = s->s_hpfs_conv;
 320         eas = s->s_hpfs_eas; chk = s->s_hpfs_chk; chkdsk = s->s_hpfs_chkdsk;
 321         errs = s->s_hpfs_err; timeshift = s->s_hpfs_timeshift;
 322
 323         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
 324             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 325                 printk("HPFS: bad mount options.\n");
 326                 return 1;
 327         }
 328         if (o == 2) {
 329                 hpfs_help();
 330                 return 1;
 331         }
 332         if (timeshift != s->s_hpfs_timeshift) {
 333                 printk("HPFS: timeshift can't be changed using remount.\n");
 334                 return 1;
 335         }
 336
 337         unmark_dirty(s);
 338
 339         s->s_hpfs_uid = uid; s->s_hpfs_gid = gid;
 340         s->s_hpfs_mode = 0777 & ~umask;
 341         s->s_hpfs_lowercase = lowercase; s->s_hpfs_conv = conv;
 342         s->s_hpfs_eas = eas; s->s_hpfs_chk = chk; s->s_hpfs_chkdsk = chkdsk;
 343         s->s_hpfs_err = errs; s->s_hpfs_timeshift = timeshift;
 344
 345         if (!(*flags & MS_RDONLY)) mark_dirty(s);
 346
 347         return 0;
 348 }
 349
 350 struct super_block *hpfs_read_super(struct super_block *s, void *options,
 351                                     int silent)
 352 {
 353         kdev_t dev;
 354         struct buffer_head *bh0, *bh1, *bh2;
 355         struct hpfs_boot_block *bootblock;
 356         struct hpfs_super_block *superblock;
 357         struct hpfs_spare_block *spareblock;
 358
 359         uid_t uid;
 360         gid_t gid;
 361         umode_t umask;
 362         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
 363
 364         dnode_secno root_dno;
 365         struct hpfs_dirent *de = NULL;
 366         struct quad_buffer_head qbh;
 367
 368         int o;
 369
 370         s->s_hpfs_bmp_dir = NULL;
 371         s->s_hpfs_cp_table = NULL;
 372
 373         s->s_hpfs_creation_de_lock = s->s_hpfs_rd_inode = 0;
 374         init_waitqueue_head(&s->s_hpfs_creation_de);
 375         init_waitqueue_head(&s->s_hpfs_iget_q);
 376
 377         uid = current->uid;
 378         gid = current->gid;
 379         umask = current->fs->umask;
 380         lowercase = 0;
 381         conv = CONV_BINARY;
 382         eas = 2;
 383         chk = 1;
 384         errs = 1;
 385         chkdsk = 1;
 386         timeshift = 0;
 387
 388         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
 389             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 390                 printk("HPFS: bad mount options.\n");
 391                 goto bail0;
 392         }
 393         if (o==2) {
 394                 hpfs_help();
 395                 goto bail0;
 396         }
 397
 398         /*s->s_hpfs_mounting = 1;*/
 399         dev = s->s_dev;
 400         set_blocksize(dev, 512);
 401         s->s_hpfs_fs_size = -1;
 402         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 403         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 404         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 405
 406         /* Check magics */
 407         if (/*bootblock->magic != BB_MAGIC
 408             ||*/ superblock->magic != SB_MAGIC
 409             || spareblock->magic != SP_MAGIC) {
 410                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
 411                 goto bail4;
 412         }
 413
 414         /* Check version */
 415         if (!(s->s_flags & MS_RDONLY) &&
 416               superblock->funcversion != 2 && superblock->funcversion != 3) {
 417                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
 418                         (int)superblock->version, (int)superblock->funcversion);
 419                 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");
 420                 goto bail4;
 421         }
 422
 423         s->s_flags |= MS_NOATIME;
 424
 425         /* Fill superblock stuff */
 426         s->s_magic = HPFS_SUPER_MAGIC;
 427         s->s_blocksize = 512;
 428         s->s_blocksize_bits = 9;
 429         s->s_op = &hpfs_sops;
 430
 431         s->s_hpfs_root = superblock->root;
 432         s->s_hpfs_fs_size = superblock->n_sectors;
 433         s->s_hpfs_bitmaps = superblock->bitmaps;
 434         s->s_hpfs_dirband_start = superblock->dir_band_start;
 435         s->s_hpfs_dirband_size = superblock->n_dir_band;
 436         s->s_hpfs_dmap = superblock->dir_band_bitmap;
 437         s->s_hpfs_uid = uid;
 438         s->s_hpfs_gid = gid;
 439         s->s_hpfs_mode = 0777 & ~umask;
 440         s->s_hpfs_n_free = -1;
 441         s->s_hpfs_n_free_dnodes = -1;
 442         s->s_hpfs_lowercase = lowercase;
 443         s->s_hpfs_conv = conv;
 444         s->s_hpfs_eas = eas;
 445         s->s_hpfs_chk = chk;
 446         s->s_hpfs_chkdsk = chkdsk;
 447         s->s_hpfs_err = errs;
 448         s->s_hpfs_timeshift = timeshift;
 449         s->s_hpfs_was_error = 0;
 450         s->s_hpfs_cp_table = NULL;
 451         s->s_hpfs_c_bitmap = -1;
 452
 453         /* Load bitmap directory */
 454         if (!(s->s_hpfs_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
 455                 goto bail4;
 456
 457         /* Check for general fs errors*/
 458         if (spareblock->dirty && !spareblock->old_wrote) {
 459                 if (errs == 2) {
 460                         printk("HPFS: Improperly stopped, not mounted\n");
 461                         goto bail4;
 462                 }
 463                 hpfs_error(s, "improperly stopped");
 464         }
 465
 466         if (!(s->s_flags & MS_RDONLY)) {
 467                 spareblock->dirty = 1;
 468                 spareblock->old_wrote = 0;
 469                 mark_buffer_dirty(bh2);
 470         }
 471
 472         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 473                 if (errs >= 2) {
 474                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 475                         mark_dirty(s);
 476                         goto bail4;
 477                 }
 478                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 479                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 480                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 481         }
 482         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
 483                 if (errs >= 2) {
 484                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 485                         mark_dirty(s);
 486                         goto bail4;
 487                 }
 488                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 489                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 490         }
 491         if (chk) {
 492                 unsigned a;
 493                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
 494                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
 495                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 496                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
 497                         goto bail4;
 498                 }
 499                 a = s->s_hpfs_dirband_size;
 500                 s->s_hpfs_dirband_size = 0;
 501                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
 502                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
 503                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
 504                         mark_dirty(s);
 505                         goto bail4;
 506                 }
 507                 s->s_hpfs_dirband_size = a;
 508         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 509
 510         /* Load code page table */
 511         if (spareblock->n_code_pages)
 512                 if (!(s->s_hpfs_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
 513                         printk("HPFS: Warning: code page support is disabled\n");
 514
 515         brelse(bh2);
 516         brelse(bh1);
 517         brelse(bh0);
 518
 519         hpfs_lock_iget(s, 1);
 520         s->s_root = d_alloc_root(iget(s, s->s_hpfs_root));
 521         hpfs_unlock_iget(s);
 522         if (!s->s_root || !s->s_root->d_inode) {
 523                 printk("HPFS: iget failed. Why???\n");
 524                 goto bail0;
 525         }
 526         hpfs_set_dentry_operations(s->s_root);
 527
 528         /*
 529          * find the root directory's . pointer & finish filling in the inode
 530          */
 531
 532         root_dno = hpfs_fnode_dno(s, s->s_hpfs_root);
 533         if (root_dno)
 534                 de = map_dirent(s->s_root->d_inode, root_dno, "\001\001", 2, NULL, &qbh);
 535         if (!root_dno || !de) hpfs_error(s, "unable to find root dir");
 536         else {
 537                 s->s_root->d_inode->i_atime = local_to_gmt(s, de->read_date);
 538                 s->s_root->d_inode->i_mtime = local_to_gmt(s, de->write_date);
 539                 s->s_root->d_inode->i_ctime = local_to_gmt(s, de->creation_date);
 540                 s->s_root->d_inode->i_hpfs_ea_size = de->ea_size;
 541                 s->s_root->d_inode->i_hpfs_parent_dir = s->s_root->d_inode->i_ino;
 542                 if (s->s_root->d_inode->i_size == -1) s->s_root->d_inode->i_size = 2048;
 543                 if (s->s_root->d_inode->i_blocks == -1) s->s_root->d_inode->i_blocks = 5;
 544         }
 545         if (de) hpfs_brelse4(&qbh);
 546
 547         return s;
 548
 549 bail4:  brelse(bh2);
 550 bail3:  brelse(bh1);
 551 bail2:  brelse(bh0);
 552 bail1:
 553 bail0:
 554         if (s->s_hpfs_bmp_dir) kfree(s->s_hpfs_bmp_dir);
 555         if (s->s_hpfs_cp_table) kfree(s->s_hpfs_cp_table);
 556         return NULL;
 557 }
 558
 559 DECLARE_FSTYPE_DEV(hpfs_fs_type, "hpfs", hpfs_read_super);
 560
 561 static int __init init_hpfs_fs(void)
 562 {
 563         return register_filesystem(&hpfs_fs_type);
 564 }
 565
 566 static void __exit exit_hpfs_fs(void)
 567 {
 568         unregister_filesystem(&hpfs_fs_type);
 569 }
 570
 571 EXPORT_NO_SYMBOLS;
 572
 573 module_init(init_hpfs_fs)
 574 module_exit(exit_hpfs_fs)