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