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