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 *new_opts; 565 char volume[32]; 566 char *prefix = NULL; 567 568 new_opts = kstrdup(data, GFP_KERNEL); 569 if (data && !new_opts) 570 return -ENOMEM; 571 572 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data); 573 574 sync_filesystem(sb); 575 *flags |= SB_NODIRATIME; 576 577 memcpy(volume, sbi->s_volume, 32); 578 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, 579 &blocksize, &prefix, volume, 580 &mount_flags)) { 581 kfree(prefix); 582 kfree(new_opts); 583 return -EINVAL; 584 } 585 586 flush_delayed_work(&sbi->sb_work); 587 588 sbi->s_flags = mount_flags; 589 sbi->s_mode = mode; 590 sbi->s_uid = uid; 591 sbi->s_gid = gid; 592 /* protect against readers */ 593 spin_lock(&sbi->symlink_lock); 594 if (prefix) { 595 kfree(sbi->s_prefix); 596 sbi->s_prefix = prefix; 597 } 598 memcpy(sbi->s_volume, volume, 32); 599 spin_unlock(&sbi->symlink_lock); 600 601 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 602 return 0; 603 604 if (*flags & SB_RDONLY) 605 affs_free_bitmap(sb); 606 else 607 res = affs_init_bitmap(sb, flags); 608 609 return res; 610 } 611 612 static int 613 affs_statfs(struct dentry *dentry, struct kstatfs *buf) 614 { 615 struct super_block *sb = dentry->d_sb; 616 int free; 617 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 618 619 pr_debug("%s() partsize=%d, reserved=%d\n", 620 __func__, AFFS_SB(sb)->s_partition_size, 621 AFFS_SB(sb)->s_reserved); 622 623 free = affs_count_free_blocks(sb); 624 buf->f_type = AFFS_SUPER_MAGIC; 625 buf->f_bsize = sb->s_blocksize; 626 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; 627 buf->f_bfree = free; 628 buf->f_bavail = free; 629 buf->f_fsid.val[0] = (u32)id; 630 buf->f_fsid.val[1] = (u32)(id >> 32); 631 buf->f_namelen = AFFSNAMEMAX; 632 return 0; 633 } 634 635 static struct dentry *affs_mount(struct file_system_type *fs_type, 636 int flags, const char *dev_name, void *data) 637 { 638 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); 639 } 640 641 static void affs_kill_sb(struct super_block *sb) 642 { 643 struct affs_sb_info *sbi = AFFS_SB(sb); 644 kill_block_super(sb); 645 if (sbi) { 646 affs_free_bitmap(sb); 647 affs_brelse(sbi->s_root_bh); 648 kfree(sbi->s_prefix); 649 mutex_destroy(&sbi->s_bmlock); 650 kfree(sbi); 651 } 652 } 653 654 static struct file_system_type affs_fs_type = { 655 .owner = THIS_MODULE, 656 .name = "affs", 657 .mount = affs_mount, 658 .kill_sb = affs_kill_sb, 659 .fs_flags = FS_REQUIRES_DEV, 660 }; 661 MODULE_ALIAS_FS("affs"); 662 663 static int __init init_affs_fs(void) 664 { 665 int err = init_inodecache(); 666 if (err) 667 goto out1; 668 err = register_filesystem(&affs_fs_type); 669 if (err) 670 goto out; 671 return 0; 672 out: 673 destroy_inodecache(); 674 out1: 675 return err; 676 } 677 678 static void __exit exit_affs_fs(void) 679 { 680 unregister_filesystem(&affs_fs_type); 681 destroy_inodecache(); 682 } 683 684 MODULE_DESCRIPTION("Amiga filesystem support for Linux"); 685 MODULE_LICENSE("GPL"); 686 687 module_init(init_affs_fs) 688 module_exit(exit_affs_fs) 689