fs/affs/super.c

   1 /*
   2  *  linux/fs/affs/inode.c
   3  *
   4  *  (c) 1996  Hans-Joachim Widmaier - Rewritten
   5  *
   6  *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
   7  *
   8  *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
   9  *
  10  *  (C) 1991  Linus Torvalds - minix filesystem
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/statfs.h>
  16 #include <linux/parser.h>
  17 #include <linux/magic.h>
  18 #include <linux/sched.h>
  19 #include <linux/cred.h>
  20 #include <linux/slab.h>
  21 #include <linux/writeback.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/iversion.h>
  25 #include "affs.h"
  26
  27 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
  28 static int affs_show_options(struct seq_file *m, struct dentry *root);
  29 static int affs_remount (struct super_block *sb, int *flags, char *data);
  30
  31 static void
  32 affs_commit_super(struct super_block *sb, int wait)
  33 {
  34         struct affs_sb_info *sbi = AFFS_SB(sb);
  35         struct buffer_head *bh = sbi->s_root_bh;
  36         struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
  37
  38         lock_buffer(bh);
  39         affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
  40         affs_fix_checksum(sb, bh);
  41         unlock_buffer(bh);
  42
  43         mark_buffer_dirty(bh);
  44         if (wait)
  45                 sync_dirty_buffer(bh);
  46 }
  47
  48 static void
  49 affs_put_super(struct super_block *sb)
  50 {
  51         struct affs_sb_info *sbi = AFFS_SB(sb);
  52         pr_debug("%s()\n", __func__);
  53
  54         cancel_delayed_work_sync(&sbi->sb_work);
  55 }
  56
  57 static int
  58 affs_sync_fs(struct super_block *sb, int wait)
  59 {
  60         affs_commit_super(sb, wait);
  61         return 0;
  62 }
  63
  64 static void flush_superblock(struct work_struct *work)
  65 {
  66         struct affs_sb_info *sbi;
  67         struct super_block *sb;
  68
  69         sbi = container_of(work, struct affs_sb_info, sb_work.work);
  70         sb = sbi->sb;
  71
  72         spin_lock(&sbi->work_lock);
  73         sbi->work_queued = 0;
  74         spin_unlock(&sbi->work_lock);
  75
  76         affs_commit_super(sb, 1);
  77 }
  78
  79 void affs_mark_sb_dirty(struct super_block *sb)
  80 {
  81         struct affs_sb_info *sbi = AFFS_SB(sb);
  82         unsigned long delay;
  83
  84         if (sb_rdonly(sb))
  85                return;
  86
  87         spin_lock(&sbi->work_lock);
  88         if (!sbi->work_queued) {
  89                delay = msecs_to_jiffies(dirty_writeback_interval * 10);
  90                queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
  91                sbi->work_queued = 1;
  92         }
  93         spin_unlock(&sbi->work_lock);
  94 }
  95
  96 static struct kmem_cache * affs_inode_cachep;
  97
  98 static struct inode *affs_alloc_inode(struct super_block *sb)
  99 {
 100         struct affs_inode_info *i;
 101
 102         i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
 103         if (!i)
 104                 return NULL;
 105
 106         inode_set_iversion(&i->vfs_inode, 1);
 107         i->i_lc = NULL;
 108         i->i_ext_bh = NULL;
 109         i->i_pa_cnt = 0;
 110
 111         return &i->vfs_inode;
 112 }
 113
 114 static void affs_i_callback(struct rcu_head *head)
 115 {
 116         struct inode *inode = container_of(head, struct inode, i_rcu);
 117         kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
 118 }
 119
 120 static void affs_destroy_inode(struct inode *inode)
 121 {
 122         call_rcu(&inode->i_rcu, affs_i_callback);
 123 }
 124
 125 static void init_once(void *foo)
 126 {
 127         struct affs_inode_info *ei = (struct affs_inode_info *) foo;
 128
 129         sema_init(&ei->i_link_lock, 1);
 130         sema_init(&ei->i_ext_lock, 1);
 131         inode_init_once(&ei->vfs_inode);
 132 }
 133
 134 static int __init init_inodecache(void)
 135 {
 136         affs_inode_cachep = kmem_cache_create("affs_inode_cache",
 137                                              sizeof(struct affs_inode_info),
 138                                              0, (SLAB_RECLAIM_ACCOUNT|
 139                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 140                                              init_once);
 141         if (affs_inode_cachep == NULL)
 142                 return -ENOMEM;
 143         return 0;
 144 }
 145
 146 static void destroy_inodecache(void)
 147 {
 148         /*
 149          * Make sure all delayed rcu free inodes are flushed before we
 150          * destroy cache.
 151          */
 152         rcu_barrier();
 153         kmem_cache_destroy(affs_inode_cachep);
 154 }
 155
 156 static const struct super_operations affs_sops = {
 157         .alloc_inode    = affs_alloc_inode,
 158         .destroy_inode  = affs_destroy_inode,
 159         .write_inode    = affs_write_inode,
 160         .evict_inode    = affs_evict_inode,
 161         .put_super      = affs_put_super,
 162         .sync_fs        = affs_sync_fs,
 163         .statfs         = affs_statfs,
 164         .remount_fs     = affs_remount,
 165         .show_options   = affs_show_options,
 166 };
 167
 168 enum {
 169         Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
 170         Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
 171         Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
 172 };
 173
 174 static const match_table_t tokens = {
 175         {Opt_bs, "bs=%u"},
 176         {Opt_mode, "mode=%o"},
 177         {Opt_mufs, "mufs"},
 178         {Opt_notruncate, "nofilenametruncate"},
 179         {Opt_prefix, "prefix=%s"},
 180         {Opt_protect, "protect"},
 181         {Opt_reserved, "reserved=%u"},
 182         {Opt_root, "root=%u"},
 183         {Opt_setgid, "setgid=%u"},
 184         {Opt_setuid, "setuid=%u"},
 185         {Opt_verbose, "verbose"},
 186         {Opt_volume, "volume=%s"},
 187         {Opt_ignore, "grpquota"},
 188         {Opt_ignore, "noquota"},
 189         {Opt_ignore, "quota"},
 190         {Opt_ignore, "usrquota"},
 191         {Opt_err, NULL},
 192 };
 193
 194 static int
 195 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
 196                 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
 197 {
 198         char *p;
 199         substring_t args[MAX_OPT_ARGS];
 200
 201         /* Fill in defaults */
 202
 203         *uid        = current_uid();
 204         *gid        = current_gid();
 205         *reserved   = 2;
 206         *root       = -1;
 207         *blocksize  = -1;
 208         volume[0]   = ':';
 209         volume[1]   = 0;
 210         *mount_opts = 0;
 211         if (!options)
 212                 return 1;
 213
 214         while ((p = strsep(&options, ",")) != NULL) {
 215                 int token, n, option;
 216                 if (!*p)
 217                         continue;
 218
 219                 token = match_token(p, tokens, args);
 220                 switch (token) {
 221                 case Opt_bs:
 222                         if (match_int(&args[0], &n))
 223                                 return 0;
 224                         if (n != 512 && n != 1024 && n != 2048
 225                             && n != 4096) {
 226                                 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
 227                                 return 0;
 228                         }
 229                         *blocksize = n;
 230                         break;
 231                 case Opt_mode:
 232                         if (match_octal(&args[0], &option))
 233                                 return 0;
 234                         *mode = option & 0777;
 235                         affs_set_opt(*mount_opts, SF_SETMODE);
 236                         break;
 237                 case Opt_mufs:
 238                         affs_set_opt(*mount_opts, SF_MUFS);
 239                         break;
 240                 case Opt_notruncate:
 241                         affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
 242                         break;
 243                 case Opt_prefix:
 244                         *prefix = match_strdup(&args[0]);
 245                         if (!*prefix)
 246                                 return 0;
 247                         affs_set_opt(*mount_opts, SF_PREFIX);
 248                         break;
 249                 case Opt_protect:
 250                         affs_set_opt(*mount_opts, SF_IMMUTABLE);
 251                         break;
 252                 case Opt_reserved:
 253                         if (match_int(&args[0], reserved))
 254                                 return 0;
 255                         break;
 256                 case Opt_root:
 257                         if (match_int(&args[0], root))
 258                                 return 0;
 259                         break;
 260                 case Opt_setgid:
 261                         if (match_int(&args[0], &option))
 262                                 return 0;
 263                         *gid = make_kgid(current_user_ns(), option);
 264                         if (!gid_valid(*gid))
 265                                 return 0;
 266                         affs_set_opt(*mount_opts, SF_SETGID);
 267                         break;
 268                 case Opt_setuid:
 269                         if (match_int(&args[0], &option))
 270                                 return 0;
 271                         *uid = make_kuid(current_user_ns(), option);
 272                         if (!uid_valid(*uid))
 273                                 return 0;
 274                         affs_set_opt(*mount_opts, SF_SETUID);
 275                         break;
 276                 case Opt_verbose:
 277                         affs_set_opt(*mount_opts, SF_VERBOSE);
 278                         break;
 279                 case Opt_volume: {
 280                         char *vol = match_strdup(&args[0]);
 281                         if (!vol)
 282                                 return 0;
 283                         strlcpy(volume, vol, 32);
 284                         kfree(vol);
 285                         break;
 286                 }
 287                 case Opt_ignore:
 288                         /* Silently ignore the quota options */
 289                         break;
 290                 default:
 291                         pr_warn("Unrecognized mount option \"%s\" or missing value\n",
 292                                 p);
 293                         return 0;
 294                 }
 295         }
 296         return 1;
 297 }
 298
 299 static int affs_show_options(struct seq_file *m, struct dentry *root)
 300 {
 301         struct super_block *sb = root->d_sb;
 302         struct affs_sb_info *sbi = AFFS_SB(sb);
 303
 304         if (sb->s_blocksize)
 305                 seq_printf(m, ",bs=%lu", sb->s_blocksize);
 306         if (affs_test_opt(sbi->s_flags, SF_SETMODE))
 307                 seq_printf(m, ",mode=%o", sbi->s_mode);
 308         if (affs_test_opt(sbi->s_flags, SF_MUFS))
 309                 seq_puts(m, ",mufs");
 310         if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
 311                 seq_puts(m, ",nofilenametruncate");
 312         if (affs_test_opt(sbi->s_flags, SF_PREFIX))
 313                 seq_printf(m, ",prefix=%s", sbi->s_prefix);
 314         if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
 315                 seq_puts(m, ",protect");
 316         if (sbi->s_reserved != 2)
 317                 seq_printf(m, ",reserved=%u", sbi->s_reserved);
 318         if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
 319                 seq_printf(m, ",root=%u", sbi->s_root_block);
 320         if (affs_test_opt(sbi->s_flags, SF_SETGID))
 321                 seq_printf(m, ",setgid=%u",
 322                            from_kgid_munged(&init_user_ns, sbi->s_gid));
 323         if (affs_test_opt(sbi->s_flags, SF_SETUID))
 324                 seq_printf(m, ",setuid=%u",
 325                            from_kuid_munged(&init_user_ns, sbi->s_uid));
 326         if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
 327                 seq_puts(m, ",verbose");
 328         if (sbi->s_volume[0])
 329                 seq_printf(m, ",volume=%s", sbi->s_volume);
 330         return 0;
 331 }
 332
 333 /* This function definitely needs to be split up. Some fine day I'll
 334  * hopefully have the guts to do so. Until then: sorry for the mess.
 335  */
 336
 337 static int affs_fill_super(struct super_block *sb, void *data, int silent)
 338 {
 339         struct affs_sb_info     *sbi;
 340         struct buffer_head      *root_bh = NULL;
 341         struct buffer_head      *boot_bh;
 342         struct inode            *root_inode = NULL;
 343         s32                      root_block;
 344         int                      size, blocksize;
 345         u32                      chksum;
 346         int                      num_bm;
 347         int                      i, j;
 348         kuid_t                   uid;
 349         kgid_t                   gid;
 350         int                      reserved;
 351         unsigned long            mount_flags;
 352         int                      tmp_flags;     /* fix remount prototype... */
 353         u8                       sig[4];
 354         int                      ret;
 355
 356         pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
 357
 358         sb->s_magic             = AFFS_SUPER_MAGIC;
 359         sb->s_op                = &affs_sops;
 360         sb->s_flags |= SB_NODIRATIME;
 361
 362         sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
 363         if (!sbi)
 364                 return -ENOMEM;
 365
 366         sb->s_fs_info = sbi;
 367         sbi->sb = sb;
 368         mutex_init(&sbi->s_bmlock);
 369         spin_lock_init(&sbi->symlink_lock);
 370         spin_lock_init(&sbi->work_lock);
 371         INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
 372
 373         if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
 374                                 &blocksize,&sbi->s_prefix,
 375                                 sbi->s_volume, &mount_flags)) {
 376                 pr_err("Error parsing options\n");
 377                 return -EINVAL;
 378         }
 379         /* N.B. after this point s_prefix must be released */
 380
 381         sbi->s_flags   = mount_flags;
 382         sbi->s_mode    = i;
 383         sbi->s_uid     = uid;
 384         sbi->s_gid     = gid;
 385         sbi->s_reserved= reserved;
 386
 387         /* Get the size of the device in 512-byte blocks.
 388          * If we later see that the partition uses bigger
 389          * blocks, we will have to change it.
 390          */
 391
 392         size = i_size_read(sb->s_bdev->bd_inode) >> 9;
 393         pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
 394
 395         affs_set_blocksize(sb, PAGE_SIZE);
 396         /* Try to find root block. Its location depends on the block size. */
 397
 398         i = bdev_logical_block_size(sb->s_bdev);
 399         j = PAGE_SIZE;
 400         if (blocksize > 0) {
 401                 i = j = blocksize;
 402                 size = size / (blocksize / 512);
 403         }
 404
 405         for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
 406                 sbi->s_root_block = root_block;
 407                 if (root_block < 0)
 408                         sbi->s_root_block = (reserved + size - 1) / 2;
 409                 pr_debug("setting blocksize to %d\n", blocksize);
 410                 affs_set_blocksize(sb, blocksize);
 411                 sbi->s_partition_size = size;
 412
 413                 /* The root block location that was calculated above is not
 414                  * correct if the partition size is an odd number of 512-
 415                  * byte blocks, which will be rounded down to a number of
 416                  * 1024-byte blocks, and if there were an even number of
 417                  * reserved blocks. Ideally, all partition checkers should
 418                  * report the real number of blocks of the real blocksize,
 419                  * but since this just cannot be done, we have to try to
 420                  * find the root block anyways. In the above case, it is one
 421                  * block behind the calculated one. So we check this one, too.
 422                  */
 423                 for (num_bm = 0; num_bm < 2; num_bm++) {
 424                         pr_debug("Dev %s, trying root=%u, bs=%d, "
 425                                 "size=%d, reserved=%d\n",
 426                                 sb->s_id,
 427                                 sbi->s_root_block + num_bm,
 428                                 blocksize, size, reserved);
 429                         root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
 430                         if (!root_bh)
 431                                 continue;
 432                         if (!affs_checksum_block(sb, root_bh) &&
 433                             be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
 434                             be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
 435                                 sbi->s_hashsize    = blocksize / 4 - 56;
 436                                 sbi->s_root_block += num_bm;
 437                                 goto got_root;
 438                         }
 439                         affs_brelse(root_bh);
 440                         root_bh = NULL;
 441                 }
 442         }
 443         if (!silent)
 444                 pr_err("No valid root block on device %s\n", sb->s_id);
 445         return -EINVAL;
 446
 447         /* N.B. after this point bh must be released */
 448 got_root:
 449         /* Keep super block in cache */
 450         sbi->s_root_bh = root_bh;
 451         root_block = sbi->s_root_block;
 452
 453         /* Find out which kind of FS we have */
 454         boot_bh = sb_bread(sb, 0);
 455         if (!boot_bh) {
 456                 pr_err("Cannot read boot block\n");
 457                 return -EINVAL;
 458         }
 459         memcpy(sig, boot_bh->b_data, 4);
 460         brelse(boot_bh);
 461         chksum = be32_to_cpu(*(__be32 *)sig);
 462
 463         /* Dircache filesystems are compatible with non-dircache ones
 464          * when reading. As long as they aren't supported, writing is
 465          * not recommended.
 466          */
 467         if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
 468              || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
 469                 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
 470                 sb->s_flags |= SB_RDONLY;
 471         }
 472         switch (chksum) {
 473         case MUFS_FS:
 474         case MUFS_INTLFFS:
 475         case MUFS_DCFFS:
 476                 affs_set_opt(sbi->s_flags, SF_MUFS);
 477                 /* fall thru */
 478         case FS_INTLFFS:
 479         case FS_DCFFS:
 480                 affs_set_opt(sbi->s_flags, SF_INTL);
 481                 break;
 482         case MUFS_FFS:
 483                 affs_set_opt(sbi->s_flags, SF_MUFS);
 484                 break;
 485         case FS_FFS:
 486                 break;
 487         case MUFS_OFS:
 488                 affs_set_opt(sbi->s_flags, SF_MUFS);
 489                 /* fall thru */
 490         case FS_OFS:
 491                 affs_set_opt(sbi->s_flags, SF_OFS);
 492                 sb->s_flags |= SB_NOEXEC;
 493                 break;
 494         case MUFS_DCOFS:
 495         case MUFS_INTLOFS:
 496                 affs_set_opt(sbi->s_flags, SF_MUFS);
 497         case FS_DCOFS:
 498         case FS_INTLOFS:
 499                 affs_set_opt(sbi->s_flags, SF_INTL);
 500                 affs_set_opt(sbi->s_flags, SF_OFS);
 501                 sb->s_flags |= SB_NOEXEC;
 502                 break;
 503         default:
 504                 pr_err("Unknown filesystem on device %s: %08X\n",
 505                        sb->s_id, chksum);
 506                 return -EINVAL;
 507         }
 508
 509         if (affs_test_opt(mount_flags, SF_VERBOSE)) {
 510                 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
 511                 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
 512                         len > 31 ? 31 : len,
 513                         AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
 514                         sig, sig[3] + '0', blocksize);
 515         }
 516
 517         sb->s_flags |= SB_NODEV | SB_NOSUID;
 518
 519         sbi->s_data_blksize = sb->s_blocksize;
 520         if (affs_test_opt(sbi->s_flags, SF_OFS))
 521                 sbi->s_data_blksize -= 24;
 522
 523         tmp_flags = sb->s_flags;
 524         ret = affs_init_bitmap(sb, &tmp_flags);
 525         if (ret)
 526                 return ret;
 527         sb->s_flags = tmp_flags;
 528
 529         /* set up enough so that it can read an inode */
 530
 531         root_inode = affs_iget(sb, root_block);
 532         if (IS_ERR(root_inode))
 533                 return PTR_ERR(root_inode);
 534
 535         if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
 536                 sb->s_d_op = &affs_intl_dentry_operations;
 537         else
 538                 sb->s_d_op = &affs_dentry_operations;
 539
 540         sb->s_root = d_make_root(root_inode);
 541         if (!sb->s_root) {
 542                 pr_err("AFFS: Get root inode failed\n");
 543                 return -ENOMEM;
 544         }
 545
 546         sb->s_export_op = &affs_export_ops;
 547         pr_debug("s_flags=%lX\n", sb->s_flags);
 548         return 0;
 549 }
 550
 551 static int
 552 affs_remount(struct super_block *sb, int *flags, char *data)
 553 {
 554         struct affs_sb_info     *sbi = AFFS_SB(sb);
 555         int                      blocksize;
 556         kuid_t                   uid;
 557         kgid_t                   gid;
 558         int                      mode;
 559         int                      reserved;
 560         int                      root_block;
 561         unsigned long            mount_flags;
 562         int                      res = 0;
 563         char                    *new_opts;
 564         char                     volume[32];
 565         char                    *prefix = NULL;
 566
 567         new_opts = kstrdup(data, GFP_KERNEL);
 568         if (data && !new_opts)
 569                 return -ENOMEM;
 570
 571         pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
 572
 573         sync_filesystem(sb);
 574         *flags |= SB_NODIRATIME;
 575
 576         memcpy(volume, sbi->s_volume, 32);
 577         if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
 578                            &blocksize, &prefix, volume,
 579                            &mount_flags)) {
 580                 kfree(prefix);
 581                 kfree(new_opts);
 582                 return -EINVAL;
 583         }
 584
 585         flush_delayed_work(&sbi->sb_work);
 586
 587         sbi->s_flags = mount_flags;
 588         sbi->s_mode  = mode;
 589         sbi->s_uid   = uid;
 590         sbi->s_gid   = gid;
 591         /* protect against readers */
 592         spin_lock(&sbi->symlink_lock);
 593         if (prefix) {
 594                 kfree(sbi->s_prefix);
 595                 sbi->s_prefix = prefix;
 596         }
 597         memcpy(sbi->s_volume, volume, 32);
 598         spin_unlock(&sbi->symlink_lock);
 599
 600         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 601                 return 0;
 602
 603         if (*flags & SB_RDONLY)
 604                 affs_free_bitmap(sb);
 605         else
 606                 res = affs_init_bitmap(sb, flags);
 607
 608         return res;
 609 }
 610
 611 static int
 612 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
 613 {
 614         struct super_block *sb = dentry->d_sb;
 615         int              free;
 616         u64              id = huge_encode_dev(sb->s_bdev->bd_dev);
 617
 618         pr_debug("%s() partsize=%d, reserved=%d\n",
 619                  __func__, AFFS_SB(sb)->s_partition_size,
 620                  AFFS_SB(sb)->s_reserved);
 621
 622         free          = affs_count_free_blocks(sb);
 623         buf->f_type    = AFFS_SUPER_MAGIC;
 624         buf->f_bsize   = sb->s_blocksize;
 625         buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
 626         buf->f_bfree   = free;
 627         buf->f_bavail  = free;
 628         buf->f_fsid.val[0] = (u32)id;
 629         buf->f_fsid.val[1] = (u32)(id >> 32);
 630         buf->f_namelen = AFFSNAMEMAX;
 631         return 0;
 632 }
 633
 634 static struct dentry *affs_mount(struct file_system_type *fs_type,
 635         int flags, const char *dev_name, void *data)
 636 {
 637         return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
 638 }
 639
 640 static void affs_kill_sb(struct super_block *sb)
 641 {
 642         struct affs_sb_info *sbi = AFFS_SB(sb);
 643         kill_block_super(sb);
 644         if (sbi) {
 645                 affs_free_bitmap(sb);
 646                 affs_brelse(sbi->s_root_bh);
 647                 kfree(sbi->s_prefix);
 648                 mutex_destroy(&sbi->s_bmlock);
 649                 kfree(sbi);
 650         }
 651 }
 652
 653 static struct file_system_type affs_fs_type = {
 654         .owner          = THIS_MODULE,
 655         .name           = "affs",
 656         .mount          = affs_mount,
 657         .kill_sb        = affs_kill_sb,
 658         .fs_flags       = FS_REQUIRES_DEV,
 659 };
 660 MODULE_ALIAS_FS("affs");
 661
 662 static int __init init_affs_fs(void)
 663 {
 664         int err = init_inodecache();
 665         if (err)
 666                 goto out1;
 667         err = register_filesystem(&affs_fs_type);
 668         if (err)
 669                 goto out;
 670         return 0;
 671 out:
 672         destroy_inodecache();
 673 out1:
 674         return err;
 675 }
 676
 677 static void __exit exit_affs_fs(void)
 678 {
 679         unregister_filesystem(&affs_fs_type);
 680         destroy_inodecache();
 681 }
 682
 683 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
 684 MODULE_LICENSE("GPL");
 685
 686 module_init(init_affs_fs)
 687 module_exit(exit_affs_fs)