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                         kfree(*prefix);
 245                         *prefix = match_strdup(&args[0]);
 246                         if (!*prefix)
 247                                 return 0;
 248                         affs_set_opt(*mount_opts, SF_PREFIX);
 249                         break;
 250                 case Opt_protect:
 251                         affs_set_opt(*mount_opts, SF_IMMUTABLE);
 252                         break;
 253                 case Opt_reserved:
 254                         if (match_int(&args[0], reserved))
 255                                 return 0;
 256                         break;
 257                 case Opt_root:
 258                         if (match_int(&args[0], root))
 259                                 return 0;
 260                         break;
 261                 case Opt_setgid:
 262                         if (match_int(&args[0], &option))
 263                                 return 0;
 264                         *gid = make_kgid(current_user_ns(), option);
 265                         if (!gid_valid(*gid))
 266                                 return 0;
 267                         affs_set_opt(*mount_opts, SF_SETGID);
 268                         break;
 269                 case Opt_setuid:
 270                         if (match_int(&args[0], &option))
 271                                 return 0;
 272                         *uid = make_kuid(current_user_ns(), option);
 273                         if (!uid_valid(*uid))
 274                                 return 0;
 275                         affs_set_opt(*mount_opts, SF_SETUID);
 276                         break;
 277                 case Opt_verbose:
 278                         affs_set_opt(*mount_opts, SF_VERBOSE);
 279                         break;
 280                 case Opt_volume: {
 281                         char *vol = match_strdup(&args[0]);
 282                         if (!vol)
 283                                 return 0;
 284                         strlcpy(volume, vol, 32);
 285                         kfree(vol);
 286                         break;
 287                 }
 288                 case Opt_ignore:
 289                         /* Silently ignore the quota options */
 290                         break;
 291                 default:
 292                         pr_warn("Unrecognized mount option \"%s\" or missing value\n",
 293                                 p);
 294                         return 0;
 295                 }
 296         }
 297         return 1;
 298 }
 299
 300 static int affs_show_options(struct seq_file *m, struct dentry *root)
 301 {
 302         struct super_block *sb = root->d_sb;
 303         struct affs_sb_info *sbi = AFFS_SB(sb);
 304
 305         if (sb->s_blocksize)
 306                 seq_printf(m, ",bs=%lu", sb->s_blocksize);
 307         if (affs_test_opt(sbi->s_flags, SF_SETMODE))
 308                 seq_printf(m, ",mode=%o", sbi->s_mode);
 309         if (affs_test_opt(sbi->s_flags, SF_MUFS))
 310                 seq_puts(m, ",mufs");
 311         if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
 312                 seq_puts(m, ",nofilenametruncate");
 313         if (affs_test_opt(sbi->s_flags, SF_PREFIX))
 314                 seq_printf(m, ",prefix=%s", sbi->s_prefix);
 315         if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
 316                 seq_puts(m, ",protect");
 317         if (sbi->s_reserved != 2)
 318                 seq_printf(m, ",reserved=%u", sbi->s_reserved);
 319         if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
 320                 seq_printf(m, ",root=%u", sbi->s_root_block);
 321         if (affs_test_opt(sbi->s_flags, SF_SETGID))
 322                 seq_printf(m, ",setgid=%u",
 323                            from_kgid_munged(&init_user_ns, sbi->s_gid));
 324         if (affs_test_opt(sbi->s_flags, SF_SETUID))
 325                 seq_printf(m, ",setuid=%u",
 326                            from_kuid_munged(&init_user_ns, sbi->s_uid));
 327         if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
 328                 seq_puts(m, ",verbose");
 329         if (sbi->s_volume[0])
 330                 seq_printf(m, ",volume=%s", sbi->s_volume);
 331         return 0;
 332 }
 333
 334 /* This function definitely needs to be split up. Some fine day I'll
 335  * hopefully have the guts to do so. Until then: sorry for the mess.
 336  */
 337
 338 static int affs_fill_super(struct super_block *sb, void *data, int silent)
 339 {
 340         struct affs_sb_info     *sbi;
 341         struct buffer_head      *root_bh = NULL;
 342         struct buffer_head      *boot_bh;
 343         struct inode            *root_inode = NULL;
 344         s32                      root_block;
 345         int                      size, blocksize;
 346         u32                      chksum;
 347         int                      num_bm;
 348         int                      i, j;
 349         kuid_t                   uid;
 350         kgid_t                   gid;
 351         int                      reserved;
 352         unsigned long            mount_flags;
 353         int                      tmp_flags;     /* fix remount prototype... */
 354         u8                       sig[4];
 355         int                      ret;
 356
 357         pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
 358
 359         sb->s_magic             = AFFS_SUPER_MAGIC;
 360         sb->s_op                = &affs_sops;
 361         sb->s_flags |= SB_NODIRATIME;
 362
 363         sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
 364         if (!sbi)
 365                 return -ENOMEM;
 366
 367         sb->s_fs_info = sbi;
 368         sbi->sb = sb;
 369         mutex_init(&sbi->s_bmlock);
 370         spin_lock_init(&sbi->symlink_lock);
 371         spin_lock_init(&sbi->work_lock);
 372         INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
 373
 374         if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
 375                                 &blocksize,&sbi->s_prefix,
 376                                 sbi->s_volume, &mount_flags)) {
 377                 pr_err("Error parsing options\n");
 378                 return -EINVAL;
 379         }
 380         /* N.B. after this point s_prefix must be released */
 381
 382         sbi->s_flags   = mount_flags;
 383         sbi->s_mode    = i;
 384         sbi->s_uid     = uid;
 385         sbi->s_gid     = gid;
 386         sbi->s_reserved= reserved;
 387
 388         /* Get the size of the device in 512-byte blocks.
 389          * If we later see that the partition uses bigger
 390          * blocks, we will have to change it.
 391          */
 392
 393         size = i_size_read(sb->s_bdev->bd_inode) >> 9;
 394         pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
 395
 396         affs_set_blocksize(sb, PAGE_SIZE);
 397         /* Try to find root block. Its location depends on the block size. */
 398
 399         i = bdev_logical_block_size(sb->s_bdev);
 400         j = PAGE_SIZE;
 401         if (blocksize > 0) {
 402                 i = j = blocksize;
 403                 size = size / (blocksize / 512);
 404         }
 405
 406         for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
 407                 sbi->s_root_block = root_block;
 408                 if (root_block < 0)
 409                         sbi->s_root_block = (reserved + size - 1) / 2;
 410                 pr_debug("setting blocksize to %d\n", blocksize);
 411                 affs_set_blocksize(sb, blocksize);
 412                 sbi->s_partition_size = size;
 413
 414                 /* The root block location that was calculated above is not
 415                  * correct if the partition size is an odd number of 512-
 416                  * byte blocks, which will be rounded down to a number of
 417                  * 1024-byte blocks, and if there were an even number of
 418                  * reserved blocks. Ideally, all partition checkers should
 419                  * report the real number of blocks of the real blocksize,
 420                  * but since this just cannot be done, we have to try to
 421                  * find the root block anyways. In the above case, it is one
 422                  * block behind the calculated one. So we check this one, too.
 423                  */
 424                 for (num_bm = 0; num_bm < 2; num_bm++) {
 425                         pr_debug("Dev %s, trying root=%u, bs=%d, "
 426                                 "size=%d, reserved=%d\n",
 427                                 sb->s_id,
 428                                 sbi->s_root_block + num_bm,
 429                                 blocksize, size, reserved);
 430                         root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
 431                         if (!root_bh)
 432                                 continue;
 433                         if (!affs_checksum_block(sb, root_bh) &&
 434                             be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
 435                             be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
 436                                 sbi->s_hashsize    = blocksize / 4 - 56;
 437                                 sbi->s_root_block += num_bm;
 438                                 goto got_root;
 439                         }
 440                         affs_brelse(root_bh);
 441                         root_bh = NULL;
 442                 }
 443         }
 444         if (!silent)
 445                 pr_err("No valid root block on device %s\n", sb->s_id);
 446         return -EINVAL;
 447
 448         /* N.B. after this point bh must be released */
 449 got_root:
 450         /* Keep super block in cache */
 451         sbi->s_root_bh = root_bh;
 452         root_block = sbi->s_root_block;
 453
 454         /* Find out which kind of FS we have */
 455         boot_bh = sb_bread(sb, 0);
 456         if (!boot_bh) {
 457                 pr_err("Cannot read boot block\n");
 458                 return -EINVAL;
 459         }
 460         memcpy(sig, boot_bh->b_data, 4);
 461         brelse(boot_bh);
 462         chksum = be32_to_cpu(*(__be32 *)sig);
 463
 464         /* Dircache filesystems are compatible with non-dircache ones
 465          * when reading. As long as they aren't supported, writing is
 466          * not recommended.
 467          */
 468         if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
 469              || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
 470                 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
 471                 sb->s_flags |= SB_RDONLY;
 472         }
 473         switch (chksum) {
 474         case MUFS_FS:
 475         case MUFS_INTLFFS:
 476         case MUFS_DCFFS:
 477                 affs_set_opt(sbi->s_flags, SF_MUFS);
 478                 /* fall thru */
 479         case FS_INTLFFS:
 480         case FS_DCFFS:
 481                 affs_set_opt(sbi->s_flags, SF_INTL);
 482                 break;
 483         case MUFS_FFS:
 484                 affs_set_opt(sbi->s_flags, SF_MUFS);
 485                 break;
 486         case FS_FFS:
 487                 break;
 488         case MUFS_OFS:
 489                 affs_set_opt(sbi->s_flags, SF_MUFS);
 490                 /* fall thru */
 491         case FS_OFS:
 492                 affs_set_opt(sbi->s_flags, SF_OFS);
 493                 sb->s_flags |= SB_NOEXEC;
 494                 break;
 495         case MUFS_DCOFS:
 496         case MUFS_INTLOFS:
 497                 affs_set_opt(sbi->s_flags, SF_MUFS);
 498         case FS_DCOFS:
 499         case FS_INTLOFS:
 500                 affs_set_opt(sbi->s_flags, SF_INTL);
 501                 affs_set_opt(sbi->s_flags, SF_OFS);
 502                 sb->s_flags |= SB_NOEXEC;
 503                 break;
 504         default:
 505                 pr_err("Unknown filesystem on device %s: %08X\n",
 506                        sb->s_id, chksum);
 507                 return -EINVAL;
 508         }
 509
 510         if (affs_test_opt(mount_flags, SF_VERBOSE)) {
 511                 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
 512                 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
 513                         len > 31 ? 31 : len,
 514                         AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
 515                         sig, sig[3] + '0', blocksize);
 516         }
 517
 518         sb->s_flags |= SB_NODEV | SB_NOSUID;
 519
 520         sbi->s_data_blksize = sb->s_blocksize;
 521         if (affs_test_opt(sbi->s_flags, SF_OFS))
 522                 sbi->s_data_blksize -= 24;
 523
 524         tmp_flags = sb->s_flags;
 525         ret = affs_init_bitmap(sb, &tmp_flags);
 526         if (ret)
 527                 return ret;
 528         sb->s_flags = tmp_flags;
 529
 530         /* set up enough so that it can read an inode */
 531
 532         root_inode = affs_iget(sb, root_block);
 533         if (IS_ERR(root_inode))
 534                 return PTR_ERR(root_inode);
 535
 536         if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
 537                 sb->s_d_op = &affs_intl_dentry_operations;
 538         else
 539                 sb->s_d_op = &affs_dentry_operations;
 540
 541         sb->s_root = d_make_root(root_inode);
 542         if (!sb->s_root) {
 543                 pr_err("AFFS: Get root inode failed\n");
 544                 return -ENOMEM;
 545         }
 546
 547         sb->s_export_op = &affs_export_ops;
 548         pr_debug("s_flags=%lX\n", sb->s_flags);
 549         return 0;
 550 }
 551
 552 static int
 553 affs_remount(struct super_block *sb, int *flags, char *data)
 554 {
 555         struct affs_sb_info     *sbi = AFFS_SB(sb);
 556         int                      blocksize;
 557         kuid_t                   uid;
 558         kgid_t                   gid;
 559         int                      mode;
 560         int                      reserved;
 561         int                      root_block;
 562         unsigned long            mount_flags;
 563         int                      res = 0;
 564         char                     volume[32];
 565         char                    *prefix = NULL;
 566
 567         pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
 568
 569         sync_filesystem(sb);
 570         *flags |= SB_NODIRATIME;
 571
 572         memcpy(volume, sbi->s_volume, 32);
 573         if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
 574                            &blocksize, &prefix, volume,
 575                            &mount_flags)) {
 576                 kfree(prefix);
 577                 return -EINVAL;
 578         }
 579
 580         flush_delayed_work(&sbi->sb_work);
 581
 582         sbi->s_flags = mount_flags;
 583         sbi->s_mode  = mode;
 584         sbi->s_uid   = uid;
 585         sbi->s_gid   = gid;
 586         /* protect against readers */
 587         spin_lock(&sbi->symlink_lock);
 588         if (prefix) {
 589                 kfree(sbi->s_prefix);
 590                 sbi->s_prefix = prefix;
 591         }
 592         memcpy(sbi->s_volume, volume, 32);
 593         spin_unlock(&sbi->symlink_lock);
 594
 595         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 596                 return 0;
 597
 598         if (*flags & SB_RDONLY)
 599                 affs_free_bitmap(sb);
 600         else
 601                 res = affs_init_bitmap(sb, flags);
 602
 603         return res;
 604 }
 605
 606 static int
 607 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
 608 {
 609         struct super_block *sb = dentry->d_sb;
 610         int              free;
 611         u64              id = huge_encode_dev(sb->s_bdev->bd_dev);
 612
 613         pr_debug("%s() partsize=%d, reserved=%d\n",
 614                  __func__, AFFS_SB(sb)->s_partition_size,
 615                  AFFS_SB(sb)->s_reserved);
 616
 617         free          = affs_count_free_blocks(sb);
 618         buf->f_type    = AFFS_SUPER_MAGIC;
 619         buf->f_bsize   = sb->s_blocksize;
 620         buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
 621         buf->f_bfree   = free;
 622         buf->f_bavail  = free;
 623         buf->f_fsid.val[0] = (u32)id;
 624         buf->f_fsid.val[1] = (u32)(id >> 32);
 625         buf->f_namelen = AFFSNAMEMAX;
 626         return 0;
 627 }
 628
 629 static struct dentry *affs_mount(struct file_system_type *fs_type,
 630         int flags, const char *dev_name, void *data)
 631 {
 632         return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
 633 }
 634
 635 static void affs_kill_sb(struct super_block *sb)
 636 {
 637         struct affs_sb_info *sbi = AFFS_SB(sb);
 638         kill_block_super(sb);
 639         if (sbi) {
 640                 affs_free_bitmap(sb);
 641                 affs_brelse(sbi->s_root_bh);
 642                 kfree(sbi->s_prefix);
 643                 mutex_destroy(&sbi->s_bmlock);
 644                 kfree(sbi);
 645         }
 646 }
 647
 648 static struct file_system_type affs_fs_type = {
 649         .owner          = THIS_MODULE,
 650         .name           = "affs",
 651         .mount          = affs_mount,
 652         .kill_sb        = affs_kill_sb,
 653         .fs_flags       = FS_REQUIRES_DEV,
 654 };
 655 MODULE_ALIAS_FS("affs");
 656
 657 static int __init init_affs_fs(void)
 658 {
 659         int err = init_inodecache();
 660         if (err)
 661                 goto out1;
 662         err = register_filesystem(&affs_fs_type);
 663         if (err)
 664                 goto out;
 665         return 0;
 666 out:
 667         destroy_inodecache();
 668 out1:
 669         return err;
 670 }
 671
 672 static void __exit exit_affs_fs(void)
 673 {
 674         unregister_filesystem(&affs_fs_type);
 675         destroy_inodecache();
 676 }
 677
 678 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
 679 MODULE_LICENSE("GPL");
 680
 681 module_init(init_affs_fs)
 682 module_exit(exit_affs_fs)