1 /* 2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README 3 * 4 * Trivial changes by Alan Cox to add the LFS fixes 5 * 6 * Trivial Changes: 7 * Rights granted to Hans Reiser to redistribute under other terms providing 8 * he accepts all liability including but not limited to patent, fitness 9 * for purpose, and direct or indirect claims arising from failure to perform. 10 * 11 * NO WARRANTY 12 */ 13 14 #include <linux/module.h> 15 #include <linux/slab.h> 16 #include <linux/vmalloc.h> 17 #include <linux/time.h> 18 #include <linux/uaccess.h> 19 #include "reiserfs.h" 20 #include "acl.h" 21 #include "xattr.h" 22 #include <linux/init.h> 23 #include <linux/blkdev.h> 24 #include <linux/backing-dev.h> 25 #include <linux/buffer_head.h> 26 #include <linux/exportfs.h> 27 #include <linux/quotaops.h> 28 #include <linux/vfs.h> 29 #include <linux/mount.h> 30 #include <linux/namei.h> 31 #include <linux/crc32.h> 32 #include <linux/seq_file.h> 33 34 struct file_system_type reiserfs_fs_type; 35 36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING; 37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING; 38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING; 39 40 int is_reiserfs_3_5(struct reiserfs_super_block *rs) 41 { 42 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string, 43 strlen(reiserfs_3_5_magic_string)); 44 } 45 46 int is_reiserfs_3_6(struct reiserfs_super_block *rs) 47 { 48 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string, 49 strlen(reiserfs_3_6_magic_string)); 50 } 51 52 int is_reiserfs_jr(struct reiserfs_super_block *rs) 53 { 54 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string, 55 strlen(reiserfs_jr_magic_string)); 56 } 57 58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs) 59 { 60 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) || 61 is_reiserfs_jr(rs)); 62 } 63 64 static int reiserfs_remount(struct super_block *s, int *flags, char *data); 65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf); 66 67 static int reiserfs_sync_fs(struct super_block *s, int wait) 68 { 69 struct reiserfs_transaction_handle th; 70 71 /* 72 * Writeback quota in non-journalled quota case - journalled quota has 73 * no dirty dquots 74 */ 75 dquot_writeback_dquots(s, -1); 76 reiserfs_write_lock(s); 77 if (!journal_begin(&th, s, 1)) 78 if (!journal_end_sync(&th)) 79 reiserfs_flush_old_commits(s); 80 reiserfs_write_unlock(s); 81 return 0; 82 } 83 84 static void flush_old_commits(struct work_struct *work) 85 { 86 struct reiserfs_sb_info *sbi; 87 struct super_block *s; 88 89 sbi = container_of(work, struct reiserfs_sb_info, old_work.work); 90 s = sbi->s_journal->j_work_sb; 91 92 spin_lock(&sbi->old_work_lock); 93 sbi->work_queued = 0; 94 spin_unlock(&sbi->old_work_lock); 95 96 reiserfs_sync_fs(s, 1); 97 } 98 99 void reiserfs_schedule_old_flush(struct super_block *s) 100 { 101 struct reiserfs_sb_info *sbi = REISERFS_SB(s); 102 unsigned long delay; 103 104 /* 105 * Avoid scheduling flush when sb is being shut down. It can race 106 * with journal shutdown and free still queued delayed work. 107 */ 108 if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE)) 109 return; 110 111 spin_lock(&sbi->old_work_lock); 112 if (!sbi->work_queued) { 113 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 114 queue_delayed_work(system_long_wq, &sbi->old_work, delay); 115 sbi->work_queued = 1; 116 } 117 spin_unlock(&sbi->old_work_lock); 118 } 119 120 static void cancel_old_flush(struct super_block *s) 121 { 122 struct reiserfs_sb_info *sbi = REISERFS_SB(s); 123 124 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work); 125 spin_lock(&sbi->old_work_lock); 126 sbi->work_queued = 0; 127 spin_unlock(&sbi->old_work_lock); 128 } 129 130 static int reiserfs_freeze(struct super_block *s) 131 { 132 struct reiserfs_transaction_handle th; 133 134 cancel_old_flush(s); 135 136 reiserfs_write_lock(s); 137 if (!(s->s_flags & MS_RDONLY)) { 138 int err = journal_begin(&th, s, 1); 139 if (err) { 140 reiserfs_block_writes(&th); 141 } else { 142 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 143 1); 144 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 145 reiserfs_block_writes(&th); 146 journal_end_sync(&th); 147 } 148 } 149 reiserfs_write_unlock(s); 150 return 0; 151 } 152 153 static int reiserfs_unfreeze(struct super_block *s) 154 { 155 reiserfs_allow_writes(s); 156 return 0; 157 } 158 159 extern const struct in_core_key MAX_IN_CORE_KEY; 160 161 /* 162 * this is used to delete "save link" when there are no items of a 163 * file it points to. It can either happen if unlink is completed but 164 * "save unlink" removal, or if file has both unlink and truncate 165 * pending and as unlink completes first (because key of "save link" 166 * protecting unlink is bigger that a key lf "save link" which 167 * protects truncate), so there left no items to make truncate 168 * completion on 169 */ 170 static int remove_save_link_only(struct super_block *s, 171 struct reiserfs_key *key, int oid_free) 172 { 173 struct reiserfs_transaction_handle th; 174 int err; 175 176 /* we are going to do one balancing */ 177 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT); 178 if (err) 179 return err; 180 181 reiserfs_delete_solid_item(&th, NULL, key); 182 if (oid_free) 183 /* removals are protected by direct items */ 184 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid)); 185 186 return journal_end(&th); 187 } 188 189 #ifdef CONFIG_QUOTA 190 static int reiserfs_quota_on_mount(struct super_block *, int); 191 #endif 192 193 /* look for uncompleted unlinks and truncates and complete them */ 194 static int finish_unfinished(struct super_block *s) 195 { 196 INITIALIZE_PATH(path); 197 struct cpu_key max_cpu_key, obj_key; 198 struct reiserfs_key save_link_key, last_inode_key; 199 int retval = 0; 200 struct item_head *ih; 201 struct buffer_head *bh; 202 int item_pos; 203 char *item; 204 int done; 205 struct inode *inode; 206 int truncate; 207 #ifdef CONFIG_QUOTA 208 int i; 209 int ms_active_set; 210 int quota_enabled[REISERFS_MAXQUOTAS]; 211 #endif 212 213 /* compose key to look for "save" links */ 214 max_cpu_key.version = KEY_FORMAT_3_5; 215 max_cpu_key.on_disk_key.k_dir_id = ~0U; 216 max_cpu_key.on_disk_key.k_objectid = ~0U; 217 set_cpu_key_k_offset(&max_cpu_key, ~0U); 218 max_cpu_key.key_length = 3; 219 220 memset(&last_inode_key, 0, sizeof(last_inode_key)); 221 222 #ifdef CONFIG_QUOTA 223 /* Needed for iput() to work correctly and not trash data */ 224 if (s->s_flags & MS_ACTIVE) { 225 ms_active_set = 0; 226 } else { 227 ms_active_set = 1; 228 s->s_flags |= MS_ACTIVE; 229 } 230 /* Turn on quotas so that they are updated correctly */ 231 for (i = 0; i < REISERFS_MAXQUOTAS; i++) { 232 quota_enabled[i] = 1; 233 if (REISERFS_SB(s)->s_qf_names[i]) { 234 int ret; 235 236 if (sb_has_quota_active(s, i)) { 237 quota_enabled[i] = 0; 238 continue; 239 } 240 ret = reiserfs_quota_on_mount(s, i); 241 if (ret < 0) 242 reiserfs_warning(s, "reiserfs-2500", 243 "cannot turn on journaled " 244 "quota: error %d", ret); 245 } 246 } 247 #endif 248 249 done = 0; 250 REISERFS_SB(s)->s_is_unlinked_ok = 1; 251 while (!retval) { 252 int depth; 253 retval = search_item(s, &max_cpu_key, &path); 254 if (retval != ITEM_NOT_FOUND) { 255 reiserfs_error(s, "vs-2140", 256 "search_by_key returned %d", retval); 257 break; 258 } 259 260 bh = get_last_bh(&path); 261 item_pos = get_item_pos(&path); 262 if (item_pos != B_NR_ITEMS(bh)) { 263 reiserfs_warning(s, "vs-2060", 264 "wrong position found"); 265 break; 266 } 267 item_pos--; 268 ih = item_head(bh, item_pos); 269 270 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID) 271 /* there are no "save" links anymore */ 272 break; 273 274 save_link_key = ih->ih_key; 275 if (is_indirect_le_ih(ih)) 276 truncate = 1; 277 else 278 truncate = 0; 279 280 /* reiserfs_iget needs k_dirid and k_objectid only */ 281 item = ih_item_body(bh, ih); 282 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item); 283 obj_key.on_disk_key.k_objectid = 284 le32_to_cpu(ih->ih_key.k_objectid); 285 obj_key.on_disk_key.k_offset = 0; 286 obj_key.on_disk_key.k_type = 0; 287 288 pathrelse(&path); 289 290 inode = reiserfs_iget(s, &obj_key); 291 if (IS_ERR_OR_NULL(inode)) { 292 /* 293 * the unlink almost completed, it just did not 294 * manage to remove "save" link and release objectid 295 */ 296 reiserfs_warning(s, "vs-2180", "iget failed for %K", 297 &obj_key); 298 retval = remove_save_link_only(s, &save_link_key, 1); 299 continue; 300 } 301 302 if (!truncate && inode->i_nlink) { 303 /* file is not unlinked */ 304 reiserfs_warning(s, "vs-2185", 305 "file %K is not unlinked", 306 &obj_key); 307 retval = remove_save_link_only(s, &save_link_key, 0); 308 continue; 309 } 310 depth = reiserfs_write_unlock_nested(inode->i_sb); 311 dquot_initialize(inode); 312 reiserfs_write_lock_nested(inode->i_sb, depth); 313 314 if (truncate && S_ISDIR(inode->i_mode)) { 315 /* 316 * We got a truncate request for a dir which 317 * is impossible. The only imaginable way is to 318 * execute unfinished truncate request then boot 319 * into old kernel, remove the file and create dir 320 * with the same key. 321 */ 322 reiserfs_warning(s, "green-2101", 323 "impossible truncate on a " 324 "directory %k. Please report", 325 INODE_PKEY(inode)); 326 retval = remove_save_link_only(s, &save_link_key, 0); 327 truncate = 0; 328 iput(inode); 329 continue; 330 } 331 332 if (truncate) { 333 REISERFS_I(inode)->i_flags |= 334 i_link_saved_truncate_mask; 335 /* 336 * not completed truncate found. New size was 337 * committed together with "save" link 338 */ 339 reiserfs_info(s, "Truncating %k to %lld ..", 340 INODE_PKEY(inode), inode->i_size); 341 342 /* don't update modification time */ 343 reiserfs_truncate_file(inode, 0); 344 345 retval = remove_save_link(inode, truncate); 346 } else { 347 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask; 348 /* not completed unlink (rmdir) found */ 349 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode)); 350 if (memcmp(&last_inode_key, INODE_PKEY(inode), 351 sizeof(last_inode_key))){ 352 last_inode_key = *INODE_PKEY(inode); 353 /* removal gets completed in iput */ 354 retval = 0; 355 } else { 356 reiserfs_warning(s, "super-2189", "Dead loop " 357 "in finish_unfinished " 358 "detected, just remove " 359 "save link\n"); 360 retval = remove_save_link_only(s, 361 &save_link_key, 0); 362 } 363 } 364 365 iput(inode); 366 printk("done\n"); 367 done++; 368 } 369 REISERFS_SB(s)->s_is_unlinked_ok = 0; 370 371 #ifdef CONFIG_QUOTA 372 /* Turn quotas off */ 373 reiserfs_write_unlock(s); 374 for (i = 0; i < REISERFS_MAXQUOTAS; i++) { 375 if (sb_dqopt(s)->files[i] && quota_enabled[i]) 376 dquot_quota_off(s, i); 377 } 378 reiserfs_write_lock(s); 379 if (ms_active_set) 380 /* Restore the flag back */ 381 s->s_flags &= ~MS_ACTIVE; 382 #endif 383 pathrelse(&path); 384 if (done) 385 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. " 386 "Completed\n", done); 387 return retval; 388 } 389 390 /* 391 * to protect file being unlinked from getting lost we "safe" link files 392 * being unlinked. This link will be deleted in the same transaction with last 393 * item of file. mounting the filesystem we scan all these links and remove 394 * files which almost got lost 395 */ 396 void add_save_link(struct reiserfs_transaction_handle *th, 397 struct inode *inode, int truncate) 398 { 399 INITIALIZE_PATH(path); 400 int retval; 401 struct cpu_key key; 402 struct item_head ih; 403 __le32 link; 404 405 BUG_ON(!th->t_trans_id); 406 407 /* file can only get one "save link" of each kind */ 408 RFALSE(truncate && 409 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask), 410 "saved link already exists for truncated inode %lx", 411 (long)inode->i_ino); 412 RFALSE(!truncate && 413 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask), 414 "saved link already exists for unlinked inode %lx", 415 (long)inode->i_ino); 416 417 /* setup key of "save" link */ 418 key.version = KEY_FORMAT_3_5; 419 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID; 420 key.on_disk_key.k_objectid = inode->i_ino; 421 if (!truncate) { 422 /* unlink, rmdir, rename */ 423 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize); 424 set_cpu_key_k_type(&key, TYPE_DIRECT); 425 426 /* item head of "safe" link */ 427 make_le_item_head(&ih, &key, key.version, 428 1 + inode->i_sb->s_blocksize, TYPE_DIRECT, 429 4 /*length */ , 0xffff /*free space */ ); 430 } else { 431 /* truncate */ 432 if (S_ISDIR(inode->i_mode)) 433 reiserfs_warning(inode->i_sb, "green-2102", 434 "Adding a truncate savelink for " 435 "a directory %k! Please report", 436 INODE_PKEY(inode)); 437 set_cpu_key_k_offset(&key, 1); 438 set_cpu_key_k_type(&key, TYPE_INDIRECT); 439 440 /* item head of "safe" link */ 441 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT, 442 4 /*length */ , 0 /*free space */ ); 443 } 444 key.key_length = 3; 445 446 /* look for its place in the tree */ 447 retval = search_item(inode->i_sb, &key, &path); 448 if (retval != ITEM_NOT_FOUND) { 449 if (retval != -ENOSPC) 450 reiserfs_error(inode->i_sb, "vs-2100", 451 "search_by_key (%K) returned %d", &key, 452 retval); 453 pathrelse(&path); 454 return; 455 } 456 457 /* body of "save" link */ 458 link = INODE_PKEY(inode)->k_dir_id; 459 460 /* put "save" link into tree, don't charge quota to anyone */ 461 retval = 462 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link); 463 if (retval) { 464 if (retval != -ENOSPC) 465 reiserfs_error(inode->i_sb, "vs-2120", 466 "insert_item returned %d", retval); 467 } else { 468 if (truncate) 469 REISERFS_I(inode)->i_flags |= 470 i_link_saved_truncate_mask; 471 else 472 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask; 473 } 474 } 475 476 /* this opens transaction unlike add_save_link */ 477 int remove_save_link(struct inode *inode, int truncate) 478 { 479 struct reiserfs_transaction_handle th; 480 struct reiserfs_key key; 481 int err; 482 483 /* we are going to do one balancing only */ 484 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT); 485 if (err) 486 return err; 487 488 /* setup key of "save" link */ 489 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID); 490 key.k_objectid = INODE_PKEY(inode)->k_objectid; 491 if (!truncate) { 492 /* unlink, rmdir, rename */ 493 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 494 1 + inode->i_sb->s_blocksize); 495 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT); 496 } else { 497 /* truncate */ 498 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1); 499 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT); 500 } 501 502 if ((truncate && 503 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) || 504 (!truncate && 505 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask))) 506 /* don't take quota bytes from anywhere */ 507 reiserfs_delete_solid_item(&th, NULL, &key); 508 if (!truncate) { 509 reiserfs_release_objectid(&th, inode->i_ino); 510 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask; 511 } else 512 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask; 513 514 return journal_end(&th); 515 } 516 517 static void reiserfs_kill_sb(struct super_block *s) 518 { 519 if (REISERFS_SB(s)) { 520 reiserfs_proc_info_done(s); 521 /* 522 * Force any pending inode evictions to occur now. Any 523 * inodes to be removed that have extended attributes 524 * associated with them need to clean them up before 525 * we can release the extended attribute root dentries. 526 * shrink_dcache_for_umount will BUG if we don't release 527 * those before it's called so ->put_super is too late. 528 */ 529 shrink_dcache_sb(s); 530 531 dput(REISERFS_SB(s)->xattr_root); 532 REISERFS_SB(s)->xattr_root = NULL; 533 dput(REISERFS_SB(s)->priv_root); 534 REISERFS_SB(s)->priv_root = NULL; 535 } 536 537 kill_block_super(s); 538 } 539 540 static void reiserfs_put_super(struct super_block *s) 541 { 542 struct reiserfs_transaction_handle th; 543 th.t_trans_id = 0; 544 545 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 546 547 reiserfs_write_lock(s); 548 549 /* 550 * change file system state to current state if it was mounted 551 * with read-write permissions 552 */ 553 if (!(s->s_flags & MS_RDONLY)) { 554 if (!journal_begin(&th, s, 10)) { 555 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 556 1); 557 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s), 558 REISERFS_SB(s)->s_mount_state); 559 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 560 } 561 } 562 563 /* 564 * note, journal_release checks for readonly mount, and can 565 * decide not to do a journal_end 566 */ 567 journal_release(&th, s); 568 569 reiserfs_free_bitmap_cache(s); 570 571 brelse(SB_BUFFER_WITH_SB(s)); 572 573 print_statistics(s); 574 575 if (REISERFS_SB(s)->reserved_blocks != 0) { 576 reiserfs_warning(s, "green-2005", "reserved blocks left %d", 577 REISERFS_SB(s)->reserved_blocks); 578 } 579 580 reiserfs_write_unlock(s); 581 mutex_destroy(&REISERFS_SB(s)->lock); 582 destroy_workqueue(REISERFS_SB(s)->commit_wq); 583 kfree(s->s_fs_info); 584 s->s_fs_info = NULL; 585 } 586 587 static struct kmem_cache *reiserfs_inode_cachep; 588 589 static struct inode *reiserfs_alloc_inode(struct super_block *sb) 590 { 591 struct reiserfs_inode_info *ei; 592 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL); 593 if (!ei) 594 return NULL; 595 atomic_set(&ei->openers, 0); 596 mutex_init(&ei->tailpack); 597 #ifdef CONFIG_QUOTA 598 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 599 #endif 600 601 return &ei->vfs_inode; 602 } 603 604 static void reiserfs_i_callback(struct rcu_head *head) 605 { 606 struct inode *inode = container_of(head, struct inode, i_rcu); 607 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode)); 608 } 609 610 static void reiserfs_destroy_inode(struct inode *inode) 611 { 612 call_rcu(&inode->i_rcu, reiserfs_i_callback); 613 } 614 615 static void init_once(void *foo) 616 { 617 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo; 618 619 INIT_LIST_HEAD(&ei->i_prealloc_list); 620 inode_init_once(&ei->vfs_inode); 621 } 622 623 static int __init init_inodecache(void) 624 { 625 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache", 626 sizeof(struct 627 reiserfs_inode_info), 628 0, (SLAB_RECLAIM_ACCOUNT| 629 SLAB_MEM_SPREAD| 630 SLAB_ACCOUNT), 631 init_once); 632 if (reiserfs_inode_cachep == NULL) 633 return -ENOMEM; 634 return 0; 635 } 636 637 static void destroy_inodecache(void) 638 { 639 /* 640 * Make sure all delayed rcu free inodes are flushed before we 641 * destroy cache. 642 */ 643 rcu_barrier(); 644 kmem_cache_destroy(reiserfs_inode_cachep); 645 } 646 647 /* we don't mark inodes dirty, we just log them */ 648 static void reiserfs_dirty_inode(struct inode *inode, int flags) 649 { 650 struct reiserfs_transaction_handle th; 651 652 int err = 0; 653 654 if (inode->i_sb->s_flags & MS_RDONLY) { 655 reiserfs_warning(inode->i_sb, "clm-6006", 656 "writing inode %lu on readonly FS", 657 inode->i_ino); 658 return; 659 } 660 reiserfs_write_lock(inode->i_sb); 661 662 /* 663 * this is really only used for atime updates, so they don't have 664 * to be included in O_SYNC or fsync 665 */ 666 err = journal_begin(&th, inode->i_sb, 1); 667 if (err) 668 goto out; 669 670 reiserfs_update_sd(&th, inode); 671 journal_end(&th); 672 673 out: 674 reiserfs_write_unlock(inode->i_sb); 675 } 676 677 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root) 678 { 679 struct super_block *s = root->d_sb; 680 struct reiserfs_journal *journal = SB_JOURNAL(s); 681 long opts = REISERFS_SB(s)->s_mount_opt; 682 683 if (opts & (1 << REISERFS_LARGETAIL)) 684 seq_puts(seq, ",tails=on"); 685 else if (!(opts & (1 << REISERFS_SMALLTAIL))) 686 seq_puts(seq, ",notail"); 687 /* tails=small is default so we don't show it */ 688 689 if (!(opts & (1 << REISERFS_BARRIER_FLUSH))) 690 seq_puts(seq, ",barrier=none"); 691 /* barrier=flush is default so we don't show it */ 692 693 if (opts & (1 << REISERFS_ERROR_CONTINUE)) 694 seq_puts(seq, ",errors=continue"); 695 else if (opts & (1 << REISERFS_ERROR_PANIC)) 696 seq_puts(seq, ",errors=panic"); 697 /* errors=ro is default so we don't show it */ 698 699 if (opts & (1 << REISERFS_DATA_LOG)) 700 seq_puts(seq, ",data=journal"); 701 else if (opts & (1 << REISERFS_DATA_WRITEBACK)) 702 seq_puts(seq, ",data=writeback"); 703 /* data=ordered is default so we don't show it */ 704 705 if (opts & (1 << REISERFS_ATTRS)) 706 seq_puts(seq, ",attrs"); 707 708 if (opts & (1 << REISERFS_XATTRS_USER)) 709 seq_puts(seq, ",user_xattr"); 710 711 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT)) 712 seq_puts(seq, ",expose_privroot"); 713 714 if (opts & (1 << REISERFS_POSIXACL)) 715 seq_puts(seq, ",acl"); 716 717 if (REISERFS_SB(s)->s_jdev) 718 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev); 719 720 if (journal->j_max_commit_age != journal->j_default_max_commit_age) 721 seq_printf(seq, ",commit=%d", journal->j_max_commit_age); 722 723 #ifdef CONFIG_QUOTA 724 if (REISERFS_SB(s)->s_qf_names[USRQUOTA]) 725 seq_show_option(seq, "usrjquota", 726 REISERFS_SB(s)->s_qf_names[USRQUOTA]); 727 else if (opts & (1 << REISERFS_USRQUOTA)) 728 seq_puts(seq, ",usrquota"); 729 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA]) 730 seq_show_option(seq, "grpjquota", 731 REISERFS_SB(s)->s_qf_names[GRPQUOTA]); 732 else if (opts & (1 << REISERFS_GRPQUOTA)) 733 seq_puts(seq, ",grpquota"); 734 if (REISERFS_SB(s)->s_jquota_fmt) { 735 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD) 736 seq_puts(seq, ",jqfmt=vfsold"); 737 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0) 738 seq_puts(seq, ",jqfmt=vfsv0"); 739 } 740 #endif 741 742 /* Block allocator options */ 743 if (opts & (1 << REISERFS_NO_BORDER)) 744 seq_puts(seq, ",block-allocator=noborder"); 745 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION)) 746 seq_puts(seq, ",block-allocator=no_unhashed_relocation"); 747 if (opts & (1 << REISERFS_HASHED_RELOCATION)) 748 seq_puts(seq, ",block-allocator=hashed_relocation"); 749 if (opts & (1 << REISERFS_TEST4)) 750 seq_puts(seq, ",block-allocator=test4"); 751 show_alloc_options(seq, s); 752 return 0; 753 } 754 755 #ifdef CONFIG_QUOTA 756 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *, 757 size_t, loff_t); 758 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t, 759 loff_t); 760 761 static struct dquot **reiserfs_get_dquots(struct inode *inode) 762 { 763 return REISERFS_I(inode)->i_dquot; 764 } 765 #endif 766 767 static const struct super_operations reiserfs_sops = { 768 .alloc_inode = reiserfs_alloc_inode, 769 .destroy_inode = reiserfs_destroy_inode, 770 .write_inode = reiserfs_write_inode, 771 .dirty_inode = reiserfs_dirty_inode, 772 .evict_inode = reiserfs_evict_inode, 773 .put_super = reiserfs_put_super, 774 .sync_fs = reiserfs_sync_fs, 775 .freeze_fs = reiserfs_freeze, 776 .unfreeze_fs = reiserfs_unfreeze, 777 .statfs = reiserfs_statfs, 778 .remount_fs = reiserfs_remount, 779 .show_options = reiserfs_show_options, 780 #ifdef CONFIG_QUOTA 781 .quota_read = reiserfs_quota_read, 782 .quota_write = reiserfs_quota_write, 783 .get_dquots = reiserfs_get_dquots, 784 #endif 785 }; 786 787 #ifdef CONFIG_QUOTA 788 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 789 790 static int reiserfs_write_dquot(struct dquot *); 791 static int reiserfs_acquire_dquot(struct dquot *); 792 static int reiserfs_release_dquot(struct dquot *); 793 static int reiserfs_mark_dquot_dirty(struct dquot *); 794 static int reiserfs_write_info(struct super_block *, int); 795 static int reiserfs_quota_on(struct super_block *, int, int, struct path *); 796 797 static const struct dquot_operations reiserfs_quota_operations = { 798 .write_dquot = reiserfs_write_dquot, 799 .acquire_dquot = reiserfs_acquire_dquot, 800 .release_dquot = reiserfs_release_dquot, 801 .mark_dirty = reiserfs_mark_dquot_dirty, 802 .write_info = reiserfs_write_info, 803 .alloc_dquot = dquot_alloc, 804 .destroy_dquot = dquot_destroy, 805 .get_next_id = dquot_get_next_id, 806 }; 807 808 static const struct quotactl_ops reiserfs_qctl_operations = { 809 .quota_on = reiserfs_quota_on, 810 .quota_off = dquot_quota_off, 811 .quota_sync = dquot_quota_sync, 812 .get_state = dquot_get_state, 813 .set_info = dquot_set_dqinfo, 814 .get_dqblk = dquot_get_dqblk, 815 .set_dqblk = dquot_set_dqblk, 816 }; 817 #endif 818 819 static const struct export_operations reiserfs_export_ops = { 820 .encode_fh = reiserfs_encode_fh, 821 .fh_to_dentry = reiserfs_fh_to_dentry, 822 .fh_to_parent = reiserfs_fh_to_parent, 823 .get_parent = reiserfs_get_parent, 824 }; 825 826 /* 827 * this struct is used in reiserfs_getopt () for containing the value for 828 * those mount options that have values rather than being toggles. 829 */ 830 typedef struct { 831 char *value; 832 /* 833 * bitmask which is to set on mount_options bitmask 834 * when this value is found, 0 is no bits are to be changed. 835 */ 836 int setmask; 837 /* 838 * bitmask which is to clear on mount_options bitmask 839 * when this value is found, 0 is no bits are to be changed. 840 * This is applied BEFORE setmask 841 */ 842 int clrmask; 843 } arg_desc_t; 844 845 /* Set this bit in arg_required to allow empty arguments */ 846 #define REISERFS_OPT_ALLOWEMPTY 31 847 848 /* 849 * this struct is used in reiserfs_getopt() for describing the 850 * set of reiserfs mount options 851 */ 852 typedef struct { 853 char *option_name; 854 855 /* 0 if argument is not required, not 0 otherwise */ 856 int arg_required; 857 858 /* list of values accepted by an option */ 859 const arg_desc_t *values; 860 861 /* 862 * bitmask which is to set on mount_options bitmask 863 * when this value is found, 0 is no bits are to be changed. 864 */ 865 int setmask; 866 867 /* 868 * bitmask which is to clear on mount_options bitmask 869 * when this value is found, 0 is no bits are to be changed. 870 * This is applied BEFORE setmask 871 */ 872 int clrmask; 873 } opt_desc_t; 874 875 /* possible values for -o data= */ 876 static const arg_desc_t logging_mode[] = { 877 {"ordered", 1 << REISERFS_DATA_ORDERED, 878 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)}, 879 {"journal", 1 << REISERFS_DATA_LOG, 880 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)}, 881 {"writeback", 1 << REISERFS_DATA_WRITEBACK, 882 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)}, 883 {.value = NULL} 884 }; 885 886 /* possible values for -o barrier= */ 887 static const arg_desc_t barrier_mode[] = { 888 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH}, 889 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE}, 890 {.value = NULL} 891 }; 892 893 /* 894 * possible values for "-o block-allocator=" and bits which are to be set in 895 * s_mount_opt of reiserfs specific part of in-core super block 896 */ 897 static const arg_desc_t balloc[] = { 898 {"noborder", 1 << REISERFS_NO_BORDER, 0}, 899 {"border", 0, 1 << REISERFS_NO_BORDER}, 900 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0}, 901 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0}, 902 {"test4", 1 << REISERFS_TEST4, 0}, 903 {"notest4", 0, 1 << REISERFS_TEST4}, 904 {NULL, 0, 0} 905 }; 906 907 static const arg_desc_t tails[] = { 908 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL}, 909 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, 910 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL}, 911 {NULL, 0, 0} 912 }; 913 914 static const arg_desc_t error_actions[] = { 915 {"panic", 1 << REISERFS_ERROR_PANIC, 916 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)}, 917 {"ro-remount", 1 << REISERFS_ERROR_RO, 918 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)}, 919 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG 920 {"continue", 1 << REISERFS_ERROR_CONTINUE, 921 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)}, 922 #endif 923 {NULL, 0, 0}, 924 }; 925 926 /* 927 * proceed only one option from a list *cur - string containing of mount 928 * options 929 * opts - array of options which are accepted 930 * opt_arg - if option is found and requires an argument and if it is specifed 931 * in the input - pointer to the argument is stored here 932 * bit_flags - if option requires to set a certain bit - it is set here 933 * return -1 if unknown option is found, opt->arg_required otherwise 934 */ 935 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts, 936 char **opt_arg, unsigned long *bit_flags) 937 { 938 char *p; 939 /* 940 * foo=bar, 941 * ^ ^ ^ 942 * | | +-- option_end 943 * | +-- arg_start 944 * +-- option_start 945 */ 946 const opt_desc_t *opt; 947 const arg_desc_t *arg; 948 949 p = *cur; 950 951 /* assume argument cannot contain commas */ 952 *cur = strchr(p, ','); 953 if (*cur) { 954 *(*cur) = '\0'; 955 (*cur)++; 956 } 957 958 if (!strncmp(p, "alloc=", 6)) { 959 /* 960 * Ugly special case, probably we should redo options 961 * parser so that it can understand several arguments for 962 * some options, also so that it can fill several bitfields 963 * with option values. 964 */ 965 if (reiserfs_parse_alloc_options(s, p + 6)) { 966 return -1; 967 } else { 968 return 0; 969 } 970 } 971 972 /* for every option in the list */ 973 for (opt = opts; opt->option_name; opt++) { 974 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) { 975 if (bit_flags) { 976 if (opt->clrmask == 977 (1 << REISERFS_UNSUPPORTED_OPT)) 978 reiserfs_warning(s, "super-6500", 979 "%s not supported.\n", 980 p); 981 else 982 *bit_flags &= ~opt->clrmask; 983 if (opt->setmask == 984 (1 << REISERFS_UNSUPPORTED_OPT)) 985 reiserfs_warning(s, "super-6501", 986 "%s not supported.\n", 987 p); 988 else 989 *bit_flags |= opt->setmask; 990 } 991 break; 992 } 993 } 994 if (!opt->option_name) { 995 reiserfs_warning(s, "super-6502", 996 "unknown mount option \"%s\"", p); 997 return -1; 998 } 999 1000 p += strlen(opt->option_name); 1001 switch (*p) { 1002 case '=': 1003 if (!opt->arg_required) { 1004 reiserfs_warning(s, "super-6503", 1005 "the option \"%s\" does not " 1006 "require an argument\n", 1007 opt->option_name); 1008 return -1; 1009 } 1010 break; 1011 1012 case 0: 1013 if (opt->arg_required) { 1014 reiserfs_warning(s, "super-6504", 1015 "the option \"%s\" requires an " 1016 "argument\n", opt->option_name); 1017 return -1; 1018 } 1019 break; 1020 default: 1021 reiserfs_warning(s, "super-6505", 1022 "head of option \"%s\" is only correct\n", 1023 opt->option_name); 1024 return -1; 1025 } 1026 1027 /* 1028 * move to the argument, or to next option if argument is not 1029 * required 1030 */ 1031 p++; 1032 1033 if (opt->arg_required 1034 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY)) 1035 && !strlen(p)) { 1036 /* this catches "option=," if not allowed */ 1037 reiserfs_warning(s, "super-6506", 1038 "empty argument for \"%s\"\n", 1039 opt->option_name); 1040 return -1; 1041 } 1042 1043 if (!opt->values) { 1044 /* *=NULLopt_arg contains pointer to argument */ 1045 *opt_arg = p; 1046 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY); 1047 } 1048 1049 /* values possible for this option are listed in opt->values */ 1050 for (arg = opt->values; arg->value; arg++) { 1051 if (!strcmp(p, arg->value)) { 1052 if (bit_flags) { 1053 *bit_flags &= ~arg->clrmask; 1054 *bit_flags |= arg->setmask; 1055 } 1056 return opt->arg_required; 1057 } 1058 } 1059 1060 reiserfs_warning(s, "super-6506", 1061 "bad value \"%s\" for option \"%s\"\n", p, 1062 opt->option_name); 1063 return -1; 1064 } 1065 1066 /* returns 0 if something is wrong in option string, 1 - otherwise */ 1067 static int reiserfs_parse_options(struct super_block *s, 1068 1069 /* string given via mount's -o */ 1070 char *options, 1071 1072 /* 1073 * after the parsing phase, contains the 1074 * collection of bitflags defining what 1075 * mount options were selected. 1076 */ 1077 unsigned long *mount_options, 1078 1079 /* strtol-ed from NNN of resize=NNN */ 1080 unsigned long *blocks, 1081 char **jdev_name, 1082 unsigned int *commit_max_age, 1083 char **qf_names, 1084 unsigned int *qfmt) 1085 { 1086 int c; 1087 char *arg = NULL; 1088 char *pos; 1089 opt_desc_t opts[] = { 1090 /* 1091 * Compatibility stuff, so that -o notail for old 1092 * setups still work 1093 */ 1094 {"tails",.arg_required = 't',.values = tails}, 1095 {"notail",.clrmask = 1096 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, 1097 {"conv",.setmask = 1 << REISERFS_CONVERT}, 1098 {"attrs",.setmask = 1 << REISERFS_ATTRS}, 1099 {"noattrs",.clrmask = 1 << REISERFS_ATTRS}, 1100 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT}, 1101 #ifdef CONFIG_REISERFS_FS_XATTR 1102 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER}, 1103 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER}, 1104 #else 1105 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1106 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1107 #endif 1108 #ifdef CONFIG_REISERFS_FS_POSIX_ACL 1109 {"acl",.setmask = 1 << REISERFS_POSIXACL}, 1110 {"noacl",.clrmask = 1 << REISERFS_POSIXACL}, 1111 #else 1112 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1113 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1114 #endif 1115 {.option_name = "nolog"}, 1116 {"replayonly",.setmask = 1 << REPLAYONLY}, 1117 {"block-allocator",.arg_required = 'a',.values = balloc}, 1118 {"data",.arg_required = 'd',.values = logging_mode}, 1119 {"barrier",.arg_required = 'b',.values = barrier_mode}, 1120 {"resize",.arg_required = 'r',.values = NULL}, 1121 {"jdev",.arg_required = 'j',.values = NULL}, 1122 {"nolargeio",.arg_required = 'w',.values = NULL}, 1123 {"commit",.arg_required = 'c',.values = NULL}, 1124 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA}, 1125 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA}, 1126 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA}, 1127 {"errors",.arg_required = 'e',.values = error_actions}, 1128 {"usrjquota",.arg_required = 1129 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, 1130 {"grpjquota",.arg_required = 1131 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, 1132 {"jqfmt",.arg_required = 'f',.values = NULL}, 1133 {.option_name = NULL} 1134 }; 1135 1136 *blocks = 0; 1137 if (!options || !*options) 1138 /* 1139 * use default configuration: create tails, journaling on, no 1140 * conversion to newest format 1141 */ 1142 return 1; 1143 1144 for (pos = options; pos;) { 1145 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options); 1146 if (c == -1) 1147 /* wrong option is given */ 1148 return 0; 1149 1150 if (c == 'r') { 1151 char *p; 1152 1153 p = NULL; 1154 /* "resize=NNN" or "resize=auto" */ 1155 1156 if (!strcmp(arg, "auto")) { 1157 /* From JFS code, to auto-get the size. */ 1158 *blocks = 1159 s->s_bdev->bd_inode->i_size >> s-> 1160 s_blocksize_bits; 1161 } else { 1162 *blocks = simple_strtoul(arg, &p, 0); 1163 if (*p != '\0') { 1164 /* NNN does not look like a number */ 1165 reiserfs_warning(s, "super-6507", 1166 "bad value %s for " 1167 "-oresize\n", arg); 1168 return 0; 1169 } 1170 } 1171 } 1172 1173 if (c == 'c') { 1174 char *p = NULL; 1175 unsigned long val = simple_strtoul(arg, &p, 0); 1176 /* commit=NNN (time in seconds) */ 1177 if (*p != '\0' || val >= (unsigned int)-1) { 1178 reiserfs_warning(s, "super-6508", 1179 "bad value %s for -ocommit\n", 1180 arg); 1181 return 0; 1182 } 1183 *commit_max_age = (unsigned int)val; 1184 } 1185 1186 if (c == 'w') { 1187 reiserfs_warning(s, "super-6509", "nolargeio option " 1188 "is no longer supported"); 1189 return 0; 1190 } 1191 1192 if (c == 'j') { 1193 if (arg && *arg && jdev_name) { 1194 /* Hm, already assigned? */ 1195 if (*jdev_name) { 1196 reiserfs_warning(s, "super-6510", 1197 "journal device was " 1198 "already specified to " 1199 "be %s", *jdev_name); 1200 return 0; 1201 } 1202 *jdev_name = arg; 1203 } 1204 } 1205 #ifdef CONFIG_QUOTA 1206 if (c == 'u' || c == 'g') { 1207 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA; 1208 1209 if (sb_any_quota_loaded(s) && 1210 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) { 1211 reiserfs_warning(s, "super-6511", 1212 "cannot change journaled " 1213 "quota options when quota " 1214 "turned on."); 1215 return 0; 1216 } 1217 if (*arg) { /* Some filename specified? */ 1218 if (REISERFS_SB(s)->s_qf_names[qtype] 1219 && strcmp(REISERFS_SB(s)->s_qf_names[qtype], 1220 arg)) { 1221 reiserfs_warning(s, "super-6512", 1222 "%s quota file " 1223 "already specified.", 1224 QTYPE2NAME(qtype)); 1225 return 0; 1226 } 1227 if (strchr(arg, '/')) { 1228 reiserfs_warning(s, "super-6513", 1229 "quotafile must be " 1230 "on filesystem root."); 1231 return 0; 1232 } 1233 qf_names[qtype] = kstrdup(arg, GFP_KERNEL); 1234 if (!qf_names[qtype]) { 1235 reiserfs_warning(s, "reiserfs-2502", 1236 "not enough memory " 1237 "for storing " 1238 "quotafile name."); 1239 return 0; 1240 } 1241 if (qtype == USRQUOTA) 1242 *mount_options |= 1 << REISERFS_USRQUOTA; 1243 else 1244 *mount_options |= 1 << REISERFS_GRPQUOTA; 1245 } else { 1246 if (qf_names[qtype] != 1247 REISERFS_SB(s)->s_qf_names[qtype]) 1248 kfree(qf_names[qtype]); 1249 qf_names[qtype] = NULL; 1250 if (qtype == USRQUOTA) 1251 *mount_options &= ~(1 << REISERFS_USRQUOTA); 1252 else 1253 *mount_options &= ~(1 << REISERFS_GRPQUOTA); 1254 } 1255 } 1256 if (c == 'f') { 1257 if (!strcmp(arg, "vfsold")) 1258 *qfmt = QFMT_VFS_OLD; 1259 else if (!strcmp(arg, "vfsv0")) 1260 *qfmt = QFMT_VFS_V0; 1261 else { 1262 reiserfs_warning(s, "super-6514", 1263 "unknown quota format " 1264 "specified."); 1265 return 0; 1266 } 1267 if (sb_any_quota_loaded(s) && 1268 *qfmt != REISERFS_SB(s)->s_jquota_fmt) { 1269 reiserfs_warning(s, "super-6515", 1270 "cannot change journaled " 1271 "quota options when quota " 1272 "turned on."); 1273 return 0; 1274 } 1275 } 1276 #else 1277 if (c == 'u' || c == 'g' || c == 'f') { 1278 reiserfs_warning(s, "reiserfs-2503", "journaled " 1279 "quota options not supported."); 1280 return 0; 1281 } 1282 #endif 1283 } 1284 1285 #ifdef CONFIG_QUOTA 1286 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt 1287 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) { 1288 reiserfs_warning(s, "super-6515", 1289 "journaled quota format not specified."); 1290 return 0; 1291 } 1292 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) && 1293 sb_has_quota_loaded(s, USRQUOTA)) || 1294 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) && 1295 sb_has_quota_loaded(s, GRPQUOTA))) { 1296 reiserfs_warning(s, "super-6516", "quota options must " 1297 "be present when quota is turned on."); 1298 return 0; 1299 } 1300 #endif 1301 1302 return 1; 1303 } 1304 1305 static void switch_data_mode(struct super_block *s, unsigned long mode) 1306 { 1307 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) | 1308 (1 << REISERFS_DATA_ORDERED) | 1309 (1 << REISERFS_DATA_WRITEBACK)); 1310 REISERFS_SB(s)->s_mount_opt |= (1 << mode); 1311 } 1312 1313 static void handle_data_mode(struct super_block *s, unsigned long mount_options) 1314 { 1315 if (mount_options & (1 << REISERFS_DATA_LOG)) { 1316 if (!reiserfs_data_log(s)) { 1317 switch_data_mode(s, REISERFS_DATA_LOG); 1318 reiserfs_info(s, "switching to journaled data mode\n"); 1319 } 1320 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) { 1321 if (!reiserfs_data_ordered(s)) { 1322 switch_data_mode(s, REISERFS_DATA_ORDERED); 1323 reiserfs_info(s, "switching to ordered data mode\n"); 1324 } 1325 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) { 1326 if (!reiserfs_data_writeback(s)) { 1327 switch_data_mode(s, REISERFS_DATA_WRITEBACK); 1328 reiserfs_info(s, "switching to writeback data mode\n"); 1329 } 1330 } 1331 } 1332 1333 static void handle_barrier_mode(struct super_block *s, unsigned long bits) 1334 { 1335 int flush = (1 << REISERFS_BARRIER_FLUSH); 1336 int none = (1 << REISERFS_BARRIER_NONE); 1337 int all_barrier = flush | none; 1338 1339 if (bits & all_barrier) { 1340 REISERFS_SB(s)->s_mount_opt &= ~all_barrier; 1341 if (bits & flush) { 1342 REISERFS_SB(s)->s_mount_opt |= flush; 1343 printk("reiserfs: enabling write barrier flush mode\n"); 1344 } else if (bits & none) { 1345 REISERFS_SB(s)->s_mount_opt |= none; 1346 printk("reiserfs: write barriers turned off\n"); 1347 } 1348 } 1349 } 1350 1351 static void handle_attrs(struct super_block *s) 1352 { 1353 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s); 1354 1355 if (reiserfs_attrs(s)) { 1356 if (old_format_only(s)) { 1357 reiserfs_warning(s, "super-6517", "cannot support " 1358 "attributes on 3.5.x disk format"); 1359 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); 1360 return; 1361 } 1362 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) { 1363 reiserfs_warning(s, "super-6518", "cannot support " 1364 "attributes until flag is set in " 1365 "super-block"); 1366 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); 1367 } 1368 } 1369 } 1370 1371 #ifdef CONFIG_QUOTA 1372 static void handle_quota_files(struct super_block *s, char **qf_names, 1373 unsigned int *qfmt) 1374 { 1375 int i; 1376 1377 for (i = 0; i < REISERFS_MAXQUOTAS; i++) { 1378 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) 1379 kfree(REISERFS_SB(s)->s_qf_names[i]); 1380 REISERFS_SB(s)->s_qf_names[i] = qf_names[i]; 1381 } 1382 if (*qfmt) 1383 REISERFS_SB(s)->s_jquota_fmt = *qfmt; 1384 } 1385 #endif 1386 1387 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg) 1388 { 1389 struct reiserfs_super_block *rs; 1390 struct reiserfs_transaction_handle th; 1391 unsigned long blocks; 1392 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt; 1393 unsigned long safe_mask = 0; 1394 unsigned int commit_max_age = (unsigned int)-1; 1395 struct reiserfs_journal *journal = SB_JOURNAL(s); 1396 char *new_opts; 1397 int err; 1398 char *qf_names[REISERFS_MAXQUOTAS]; 1399 unsigned int qfmt = 0; 1400 #ifdef CONFIG_QUOTA 1401 int i; 1402 #endif 1403 1404 new_opts = kstrdup(arg, GFP_KERNEL); 1405 if (arg && !new_opts) 1406 return -ENOMEM; 1407 1408 sync_filesystem(s); 1409 reiserfs_write_lock(s); 1410 1411 #ifdef CONFIG_QUOTA 1412 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names)); 1413 #endif 1414 1415 rs = SB_DISK_SUPER_BLOCK(s); 1416 1417 if (!reiserfs_parse_options 1418 (s, arg, &mount_options, &blocks, NULL, &commit_max_age, 1419 qf_names, &qfmt)) { 1420 #ifdef CONFIG_QUOTA 1421 for (i = 0; i < REISERFS_MAXQUOTAS; i++) 1422 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) 1423 kfree(qf_names[i]); 1424 #endif 1425 err = -EINVAL; 1426 goto out_err_unlock; 1427 } 1428 #ifdef CONFIG_QUOTA 1429 handle_quota_files(s, qf_names, &qfmt); 1430 #endif 1431 1432 handle_attrs(s); 1433 1434 /* Add options that are safe here */ 1435 safe_mask |= 1 << REISERFS_SMALLTAIL; 1436 safe_mask |= 1 << REISERFS_LARGETAIL; 1437 safe_mask |= 1 << REISERFS_NO_BORDER; 1438 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION; 1439 safe_mask |= 1 << REISERFS_HASHED_RELOCATION; 1440 safe_mask |= 1 << REISERFS_TEST4; 1441 safe_mask |= 1 << REISERFS_ATTRS; 1442 safe_mask |= 1 << REISERFS_XATTRS_USER; 1443 safe_mask |= 1 << REISERFS_POSIXACL; 1444 safe_mask |= 1 << REISERFS_BARRIER_FLUSH; 1445 safe_mask |= 1 << REISERFS_BARRIER_NONE; 1446 safe_mask |= 1 << REISERFS_ERROR_RO; 1447 safe_mask |= 1 << REISERFS_ERROR_CONTINUE; 1448 safe_mask |= 1 << REISERFS_ERROR_PANIC; 1449 safe_mask |= 1 << REISERFS_USRQUOTA; 1450 safe_mask |= 1 << REISERFS_GRPQUOTA; 1451 1452 /* 1453 * Update the bitmask, taking care to keep 1454 * the bits we're not allowed to change here 1455 */ 1456 REISERFS_SB(s)->s_mount_opt = 1457 (REISERFS_SB(s)-> 1458 s_mount_opt & ~safe_mask) | (mount_options & safe_mask); 1459 1460 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) { 1461 journal->j_max_commit_age = commit_max_age; 1462 journal->j_max_trans_age = commit_max_age; 1463 } else if (commit_max_age == 0) { 1464 /* 0 means restore defaults. */ 1465 journal->j_max_commit_age = journal->j_default_max_commit_age; 1466 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; 1467 } 1468 1469 if (blocks) { 1470 err = reiserfs_resize(s, blocks); 1471 if (err != 0) 1472 goto out_err_unlock; 1473 } 1474 1475 if (*mount_flags & MS_RDONLY) { 1476 reiserfs_write_unlock(s); 1477 reiserfs_xattr_init(s, *mount_flags); 1478 /* remount read-only */ 1479 if (s->s_flags & MS_RDONLY) 1480 /* it is read-only already */ 1481 goto out_ok_unlocked; 1482 1483 err = dquot_suspend(s, -1); 1484 if (err < 0) 1485 goto out_err; 1486 1487 /* try to remount file system with read-only permissions */ 1488 if (sb_umount_state(rs) == REISERFS_VALID_FS 1489 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) { 1490 goto out_ok_unlocked; 1491 } 1492 1493 reiserfs_write_lock(s); 1494 1495 err = journal_begin(&th, s, 10); 1496 if (err) 1497 goto out_err_unlock; 1498 1499 /* Mounting a rw partition read-only. */ 1500 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 1501 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state); 1502 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 1503 } else { 1504 /* remount read-write */ 1505 if (!(s->s_flags & MS_RDONLY)) { 1506 reiserfs_write_unlock(s); 1507 reiserfs_xattr_init(s, *mount_flags); 1508 goto out_ok_unlocked; /* We are read-write already */ 1509 } 1510 1511 if (reiserfs_is_journal_aborted(journal)) { 1512 err = journal->j_errno; 1513 goto out_err_unlock; 1514 } 1515 1516 handle_data_mode(s, mount_options); 1517 handle_barrier_mode(s, mount_options); 1518 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); 1519 1520 /* now it is safe to call journal_begin */ 1521 s->s_flags &= ~MS_RDONLY; 1522 err = journal_begin(&th, s, 10); 1523 if (err) 1524 goto out_err_unlock; 1525 1526 /* Mount a partition which is read-only, read-write */ 1527 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 1528 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); 1529 s->s_flags &= ~MS_RDONLY; 1530 set_sb_umount_state(rs, REISERFS_ERROR_FS); 1531 if (!old_format_only(s)) 1532 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); 1533 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */ 1534 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 1535 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS; 1536 } 1537 /* this will force a full flush of all journal lists */ 1538 SB_JOURNAL(s)->j_must_wait = 1; 1539 err = journal_end(&th); 1540 if (err) 1541 goto out_err_unlock; 1542 1543 reiserfs_write_unlock(s); 1544 if (!(*mount_flags & MS_RDONLY)) { 1545 dquot_resume(s, -1); 1546 reiserfs_write_lock(s); 1547 finish_unfinished(s); 1548 reiserfs_write_unlock(s); 1549 reiserfs_xattr_init(s, *mount_flags); 1550 } 1551 1552 out_ok_unlocked: 1553 if (new_opts) 1554 replace_mount_options(s, new_opts); 1555 return 0; 1556 1557 out_err_unlock: 1558 reiserfs_write_unlock(s); 1559 out_err: 1560 kfree(new_opts); 1561 return err; 1562 } 1563 1564 static int read_super_block(struct super_block *s, int offset) 1565 { 1566 struct buffer_head *bh; 1567 struct reiserfs_super_block *rs; 1568 int fs_blocksize; 1569 1570 bh = sb_bread(s, offset / s->s_blocksize); 1571 if (!bh) { 1572 reiserfs_warning(s, "sh-2006", 1573 "bread failed (dev %s, block %lu, size %lu)", 1574 s->s_id, offset / s->s_blocksize, 1575 s->s_blocksize); 1576 return 1; 1577 } 1578 1579 rs = (struct reiserfs_super_block *)bh->b_data; 1580 if (!is_any_reiserfs_magic_string(rs)) { 1581 brelse(bh); 1582 return 1; 1583 } 1584 /* 1585 * ok, reiserfs signature (old or new) found in at the given offset 1586 */ 1587 fs_blocksize = sb_blocksize(rs); 1588 brelse(bh); 1589 sb_set_blocksize(s, fs_blocksize); 1590 1591 bh = sb_bread(s, offset / s->s_blocksize); 1592 if (!bh) { 1593 reiserfs_warning(s, "sh-2007", 1594 "bread failed (dev %s, block %lu, size %lu)", 1595 s->s_id, offset / s->s_blocksize, 1596 s->s_blocksize); 1597 return 1; 1598 } 1599 1600 rs = (struct reiserfs_super_block *)bh->b_data; 1601 if (sb_blocksize(rs) != s->s_blocksize) { 1602 reiserfs_warning(s, "sh-2011", "can't find a reiserfs " 1603 "filesystem on (dev %s, block %llu, size %lu)", 1604 s->s_id, 1605 (unsigned long long)bh->b_blocknr, 1606 s->s_blocksize); 1607 brelse(bh); 1608 return 1; 1609 } 1610 1611 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) { 1612 brelse(bh); 1613 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck " 1614 "--rebuild-tree run detected. Please run\n" 1615 "reiserfsck --rebuild-tree and wait for a " 1616 "completion. If that fails\n" 1617 "get newer reiserfsprogs package"); 1618 return 1; 1619 } 1620 1621 SB_BUFFER_WITH_SB(s) = bh; 1622 SB_DISK_SUPER_BLOCK(s) = rs; 1623 1624 /* 1625 * magic is of non-standard journal filesystem, look at s_version to 1626 * find which format is in use 1627 */ 1628 if (is_reiserfs_jr(rs)) { 1629 if (sb_version(rs) == REISERFS_VERSION_2) 1630 reiserfs_info(s, "found reiserfs format \"3.6\"" 1631 " with non-standard journal\n"); 1632 else if (sb_version(rs) == REISERFS_VERSION_1) 1633 reiserfs_info(s, "found reiserfs format \"3.5\"" 1634 " with non-standard journal\n"); 1635 else { 1636 reiserfs_warning(s, "sh-2012", "found unknown " 1637 "format \"%u\" of reiserfs with " 1638 "non-standard magic", sb_version(rs)); 1639 return 1; 1640 } 1641 } else 1642 /* 1643 * s_version of standard format may contain incorrect 1644 * information, so we just look at the magic string 1645 */ 1646 reiserfs_info(s, 1647 "found reiserfs format \"%s\" with standard journal\n", 1648 is_reiserfs_3_5(rs) ? "3.5" : "3.6"); 1649 1650 s->s_op = &reiserfs_sops; 1651 s->s_export_op = &reiserfs_export_ops; 1652 #ifdef CONFIG_QUOTA 1653 s->s_qcop = &reiserfs_qctl_operations; 1654 s->dq_op = &reiserfs_quota_operations; 1655 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1656 #endif 1657 1658 /* 1659 * new format is limited by the 32 bit wide i_blocks field, want to 1660 * be one full block below that. 1661 */ 1662 s->s_maxbytes = (512LL << 32) - s->s_blocksize; 1663 return 0; 1664 } 1665 1666 /* after journal replay, reread all bitmap and super blocks */ 1667 static int reread_meta_blocks(struct super_block *s) 1668 { 1669 ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s)); 1670 wait_on_buffer(SB_BUFFER_WITH_SB(s)); 1671 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) { 1672 reiserfs_warning(s, "reiserfs-2504", "error reading the super"); 1673 return 1; 1674 } 1675 1676 return 0; 1677 } 1678 1679 /* hash detection stuff */ 1680 1681 /* 1682 * if root directory is empty - we set default - Yura's - hash and 1683 * warn about it 1684 * FIXME: we look for only one name in a directory. If tea and yura 1685 * both have the same value - we ask user to send report to the 1686 * mailing list 1687 */ 1688 static __u32 find_hash_out(struct super_block *s) 1689 { 1690 int retval; 1691 struct inode *inode; 1692 struct cpu_key key; 1693 INITIALIZE_PATH(path); 1694 struct reiserfs_dir_entry de; 1695 struct reiserfs_de_head *deh; 1696 __u32 hash = DEFAULT_HASH; 1697 __u32 deh_hashval, teahash, r5hash, yurahash; 1698 1699 inode = d_inode(s->s_root); 1700 1701 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3); 1702 retval = search_by_entry_key(s, &key, &path, &de); 1703 if (retval == IO_ERROR) { 1704 pathrelse(&path); 1705 return UNSET_HASH; 1706 } 1707 if (retval == NAME_NOT_FOUND) 1708 de.de_entry_num--; 1709 1710 set_de_name_and_namelen(&de); 1711 deh = de.de_deh + de.de_entry_num; 1712 1713 if (deh_offset(deh) == DOT_DOT_OFFSET) { 1714 /* allow override in this case */ 1715 if (reiserfs_rupasov_hash(s)) 1716 hash = YURA_HASH; 1717 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n"); 1718 goto out; 1719 } 1720 1721 deh_hashval = GET_HASH_VALUE(deh_offset(deh)); 1722 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen)); 1723 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen)); 1724 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen)); 1725 1726 if ((teahash == r5hash && deh_hashval == r5hash) || 1727 (teahash == yurahash && deh_hashval == yurahash) || 1728 (r5hash == yurahash && deh_hashval == yurahash)) { 1729 reiserfs_warning(s, "reiserfs-2506", 1730 "Unable to automatically detect hash " 1731 "function. Please mount with -o " 1732 "hash={tea,rupasov,r5}"); 1733 hash = UNSET_HASH; 1734 goto out; 1735 } 1736 1737 if (deh_hashval == yurahash) 1738 hash = YURA_HASH; 1739 else if (deh_hashval == teahash) 1740 hash = TEA_HASH; 1741 else if (deh_hashval == r5hash) 1742 hash = R5_HASH; 1743 else { 1744 reiserfs_warning(s, "reiserfs-2506", 1745 "Unrecognised hash function"); 1746 hash = UNSET_HASH; 1747 } 1748 out: 1749 pathrelse(&path); 1750 return hash; 1751 } 1752 1753 /* finds out which hash names are sorted with */ 1754 static int what_hash(struct super_block *s) 1755 { 1756 __u32 code; 1757 1758 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s)); 1759 1760 /* 1761 * reiserfs_hash_detect() == true if any of the hash mount options 1762 * were used. We must check them to make sure the user isn't 1763 * using a bad hash value 1764 */ 1765 if (code == UNSET_HASH || reiserfs_hash_detect(s)) 1766 code = find_hash_out(s); 1767 1768 if (code != UNSET_HASH && reiserfs_hash_detect(s)) { 1769 /* 1770 * detection has found the hash, and we must check against the 1771 * mount options 1772 */ 1773 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) { 1774 reiserfs_warning(s, "reiserfs-2507", 1775 "Error, %s hash detected, " 1776 "unable to force rupasov hash", 1777 reiserfs_hashname(code)); 1778 code = UNSET_HASH; 1779 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) { 1780 reiserfs_warning(s, "reiserfs-2508", 1781 "Error, %s hash detected, " 1782 "unable to force tea hash", 1783 reiserfs_hashname(code)); 1784 code = UNSET_HASH; 1785 } else if (reiserfs_r5_hash(s) && code != R5_HASH) { 1786 reiserfs_warning(s, "reiserfs-2509", 1787 "Error, %s hash detected, " 1788 "unable to force r5 hash", 1789 reiserfs_hashname(code)); 1790 code = UNSET_HASH; 1791 } 1792 } else { 1793 /* 1794 * find_hash_out was not called or 1795 * could not determine the hash 1796 */ 1797 if (reiserfs_rupasov_hash(s)) { 1798 code = YURA_HASH; 1799 } else if (reiserfs_tea_hash(s)) { 1800 code = TEA_HASH; 1801 } else if (reiserfs_r5_hash(s)) { 1802 code = R5_HASH; 1803 } 1804 } 1805 1806 /* 1807 * if we are mounted RW, and we have a new valid hash code, update 1808 * the super 1809 */ 1810 if (code != UNSET_HASH && 1811 !(s->s_flags & MS_RDONLY) && 1812 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) { 1813 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code); 1814 } 1815 return code; 1816 } 1817 1818 /* return pointer to appropriate function */ 1819 static hashf_t hash_function(struct super_block *s) 1820 { 1821 switch (what_hash(s)) { 1822 case TEA_HASH: 1823 reiserfs_info(s, "Using tea hash to sort names\n"); 1824 return keyed_hash; 1825 case YURA_HASH: 1826 reiserfs_info(s, "Using rupasov hash to sort names\n"); 1827 return yura_hash; 1828 case R5_HASH: 1829 reiserfs_info(s, "Using r5 hash to sort names\n"); 1830 return r5_hash; 1831 } 1832 return NULL; 1833 } 1834 1835 /* this is used to set up correct value for old partitions */ 1836 static int function2code(hashf_t func) 1837 { 1838 if (func == keyed_hash) 1839 return TEA_HASH; 1840 if (func == yura_hash) 1841 return YURA_HASH; 1842 if (func == r5_hash) 1843 return R5_HASH; 1844 1845 BUG(); /* should never happen */ 1846 1847 return 0; 1848 } 1849 1850 #define SWARN(silent, s, id, ...) \ 1851 if (!(silent)) \ 1852 reiserfs_warning(s, id, __VA_ARGS__) 1853 1854 static int reiserfs_fill_super(struct super_block *s, void *data, int silent) 1855 { 1856 struct inode *root_inode; 1857 struct reiserfs_transaction_handle th; 1858 int old_format = 0; 1859 unsigned long blocks; 1860 unsigned int commit_max_age = 0; 1861 int jinit_done = 0; 1862 struct reiserfs_iget_args args; 1863 struct reiserfs_super_block *rs; 1864 char *jdev_name; 1865 struct reiserfs_sb_info *sbi; 1866 int errval = -EINVAL; 1867 char *qf_names[REISERFS_MAXQUOTAS] = {}; 1868 unsigned int qfmt = 0; 1869 1870 save_mount_options(s, data); 1871 1872 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL); 1873 if (!sbi) 1874 return -ENOMEM; 1875 s->s_fs_info = sbi; 1876 /* Set default values for options: non-aggressive tails, RO on errors */ 1877 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL); 1878 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO); 1879 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH); 1880 /* no preallocation minimum, be smart in reiserfs_file_write instead */ 1881 sbi->s_alloc_options.preallocmin = 0; 1882 /* Preallocate by 16 blocks (17-1) at once */ 1883 sbi->s_alloc_options.preallocsize = 17; 1884 /* setup default block allocator options */ 1885 reiserfs_init_alloc_options(s); 1886 1887 spin_lock_init(&sbi->old_work_lock); 1888 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits); 1889 mutex_init(&sbi->lock); 1890 sbi->lock_depth = -1; 1891 1892 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0, 1893 s->s_id); 1894 if (!sbi->commit_wq) { 1895 SWARN(silent, s, "", "Cannot allocate commit workqueue"); 1896 errval = -ENOMEM; 1897 goto error_unlocked; 1898 } 1899 1900 jdev_name = NULL; 1901 if (reiserfs_parse_options 1902 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name, 1903 &commit_max_age, qf_names, &qfmt) == 0) { 1904 goto error_unlocked; 1905 } 1906 if (jdev_name && jdev_name[0]) { 1907 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL); 1908 if (!sbi->s_jdev) { 1909 SWARN(silent, s, "", "Cannot allocate memory for " 1910 "journal device name"); 1911 goto error; 1912 } 1913 } 1914 #ifdef CONFIG_QUOTA 1915 handle_quota_files(s, qf_names, &qfmt); 1916 #endif 1917 1918 if (blocks) { 1919 SWARN(silent, s, "jmacd-7", "resize option for remount only"); 1920 goto error_unlocked; 1921 } 1922 1923 /* 1924 * try old format (undistributed bitmap, super block in 8-th 1k 1925 * block of a device) 1926 */ 1927 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES)) 1928 old_format = 1; 1929 1930 /* 1931 * try new format (64-th 1k block), which can contain reiserfs 1932 * super block 1933 */ 1934 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) { 1935 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s", 1936 s->s_id); 1937 goto error_unlocked; 1938 } 1939 1940 rs = SB_DISK_SUPER_BLOCK(s); 1941 /* 1942 * Let's do basic sanity check to verify that underlying device is not 1943 * smaller than the filesystem. If the check fails then abort and 1944 * scream, because bad stuff will happen otherwise. 1945 */ 1946 if (s->s_bdev && s->s_bdev->bd_inode 1947 && i_size_read(s->s_bdev->bd_inode) < 1948 sb_block_count(rs) * sb_blocksize(rs)) { 1949 SWARN(silent, s, "", "Filesystem cannot be " 1950 "mounted because it is bigger than the device"); 1951 SWARN(silent, s, "", "You may need to run fsck " 1952 "or increase size of your LVM partition"); 1953 SWARN(silent, s, "", "Or may be you forgot to " 1954 "reboot after fdisk when it told you to"); 1955 goto error_unlocked; 1956 } 1957 1958 sbi->s_mount_state = SB_REISERFS_STATE(s); 1959 sbi->s_mount_state = REISERFS_VALID_FS; 1960 1961 if ((errval = reiserfs_init_bitmap_cache(s))) { 1962 SWARN(silent, s, "jmacd-8", "unable to read bitmap"); 1963 goto error_unlocked; 1964 } 1965 1966 errval = -EINVAL; 1967 #ifdef CONFIG_REISERFS_CHECK 1968 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON"); 1969 SWARN(silent, s, "", "- it is slow mode for debugging."); 1970 #endif 1971 1972 /* make data=ordered the default */ 1973 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) && 1974 !reiserfs_data_writeback(s)) { 1975 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED); 1976 } 1977 1978 if (reiserfs_data_log(s)) { 1979 reiserfs_info(s, "using journaled data mode\n"); 1980 } else if (reiserfs_data_ordered(s)) { 1981 reiserfs_info(s, "using ordered data mode\n"); 1982 } else { 1983 reiserfs_info(s, "using writeback data mode\n"); 1984 } 1985 if (reiserfs_barrier_flush(s)) { 1986 printk("reiserfs: using flush barriers\n"); 1987 } 1988 1989 if (journal_init(s, jdev_name, old_format, commit_max_age)) { 1990 SWARN(silent, s, "sh-2022", 1991 "unable to initialize journal space"); 1992 goto error_unlocked; 1993 } else { 1994 /* 1995 * once this is set, journal_release must be called 1996 * if we error out of the mount 1997 */ 1998 jinit_done = 1; 1999 } 2000 2001 if (reread_meta_blocks(s)) { 2002 SWARN(silent, s, "jmacd-9", 2003 "unable to reread meta blocks after journal init"); 2004 goto error_unlocked; 2005 } 2006 2007 if (replay_only(s)) 2008 goto error_unlocked; 2009 2010 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) { 2011 SWARN(silent, s, "clm-7000", 2012 "Detected readonly device, marking FS readonly"); 2013 s->s_flags |= MS_RDONLY; 2014 } 2015 args.objectid = REISERFS_ROOT_OBJECTID; 2016 args.dirid = REISERFS_ROOT_PARENT_OBJECTID; 2017 root_inode = 2018 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor, 2019 reiserfs_init_locked_inode, (void *)&args); 2020 if (!root_inode) { 2021 SWARN(silent, s, "jmacd-10", "get root inode failed"); 2022 goto error_unlocked; 2023 } 2024 2025 /* 2026 * This path assumed to be called with the BKL in the old times. 2027 * Now we have inherited the big reiserfs lock from it and many 2028 * reiserfs helpers called in the mount path and elsewhere require 2029 * this lock to be held even if it's not always necessary. Let's be 2030 * conservative and hold it early. The window can be reduced after 2031 * careful review of the code. 2032 */ 2033 reiserfs_write_lock(s); 2034 2035 if (root_inode->i_state & I_NEW) { 2036 reiserfs_read_locked_inode(root_inode, &args); 2037 unlock_new_inode(root_inode); 2038 } 2039 2040 s->s_root = d_make_root(root_inode); 2041 if (!s->s_root) 2042 goto error; 2043 /* define and initialize hash function */ 2044 sbi->s_hash_function = hash_function(s); 2045 if (sbi->s_hash_function == NULL) { 2046 dput(s->s_root); 2047 s->s_root = NULL; 2048 goto error; 2049 } 2050 2051 if (is_reiserfs_3_5(rs) 2052 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1)) 2053 set_bit(REISERFS_3_5, &sbi->s_properties); 2054 else if (old_format) 2055 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties); 2056 else 2057 set_bit(REISERFS_3_6, &sbi->s_properties); 2058 2059 if (!(s->s_flags & MS_RDONLY)) { 2060 2061 errval = journal_begin(&th, s, 1); 2062 if (errval) { 2063 dput(s->s_root); 2064 s->s_root = NULL; 2065 goto error; 2066 } 2067 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 2068 2069 set_sb_umount_state(rs, REISERFS_ERROR_FS); 2070 set_sb_fs_state(rs, 0); 2071 2072 /* 2073 * Clear out s_bmap_nr if it would wrap. We can handle this 2074 * case, but older revisions can't. This will cause the 2075 * file system to fail mount on those older implementations, 2076 * avoiding corruption. -jeffm 2077 */ 2078 if (bmap_would_wrap(reiserfs_bmap_count(s)) && 2079 sb_bmap_nr(rs) != 0) { 2080 reiserfs_warning(s, "super-2030", "This file system " 2081 "claims to use %u bitmap blocks in " 2082 "its super block, but requires %u. " 2083 "Clearing to zero.", sb_bmap_nr(rs), 2084 reiserfs_bmap_count(s)); 2085 2086 set_sb_bmap_nr(rs, 0); 2087 } 2088 2089 if (old_format_only(s)) { 2090 /* 2091 * filesystem of format 3.5 either with standard 2092 * or non-standard journal 2093 */ 2094 if (convert_reiserfs(s)) { 2095 /* and -o conv is given */ 2096 if (!silent) 2097 reiserfs_info(s, 2098 "converting 3.5 filesystem to the 3.6 format"); 2099 2100 if (is_reiserfs_3_5(rs)) 2101 /* 2102 * put magic string of 3.6 format. 2103 * 2.2 will not be able to 2104 * mount this filesystem anymore 2105 */ 2106 memcpy(rs->s_v1.s_magic, 2107 reiserfs_3_6_magic_string, 2108 sizeof 2109 (reiserfs_3_6_magic_string)); 2110 2111 set_sb_version(rs, REISERFS_VERSION_2); 2112 reiserfs_convert_objectid_map_v1(s); 2113 set_bit(REISERFS_3_6, &sbi->s_properties); 2114 clear_bit(REISERFS_3_5, &sbi->s_properties); 2115 } else if (!silent) { 2116 reiserfs_info(s, "using 3.5.x disk format\n"); 2117 } 2118 } else 2119 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); 2120 2121 2122 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 2123 errval = journal_end(&th); 2124 if (errval) { 2125 dput(s->s_root); 2126 s->s_root = NULL; 2127 goto error; 2128 } 2129 2130 reiserfs_write_unlock(s); 2131 if ((errval = reiserfs_lookup_privroot(s)) || 2132 (errval = reiserfs_xattr_init(s, s->s_flags))) { 2133 dput(s->s_root); 2134 s->s_root = NULL; 2135 goto error_unlocked; 2136 } 2137 reiserfs_write_lock(s); 2138 2139 /* 2140 * look for files which were to be removed in previous session 2141 */ 2142 finish_unfinished(s); 2143 } else { 2144 if (old_format_only(s) && !silent) { 2145 reiserfs_info(s, "using 3.5.x disk format\n"); 2146 } 2147 2148 reiserfs_write_unlock(s); 2149 if ((errval = reiserfs_lookup_privroot(s)) || 2150 (errval = reiserfs_xattr_init(s, s->s_flags))) { 2151 dput(s->s_root); 2152 s->s_root = NULL; 2153 goto error_unlocked; 2154 } 2155 reiserfs_write_lock(s); 2156 } 2157 /* 2158 * mark hash in super block: it could be unset. overwrite should be ok 2159 */ 2160 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function)); 2161 2162 handle_attrs(s); 2163 2164 reiserfs_proc_info_init(s); 2165 2166 init_waitqueue_head(&(sbi->s_wait)); 2167 spin_lock_init(&sbi->bitmap_lock); 2168 2169 reiserfs_write_unlock(s); 2170 2171 return (0); 2172 2173 error: 2174 reiserfs_write_unlock(s); 2175 2176 error_unlocked: 2177 /* kill the commit thread, free journal ram */ 2178 if (jinit_done) { 2179 reiserfs_write_lock(s); 2180 journal_release_error(NULL, s); 2181 reiserfs_write_unlock(s); 2182 } 2183 2184 if (sbi->commit_wq) 2185 destroy_workqueue(sbi->commit_wq); 2186 2187 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work); 2188 2189 reiserfs_free_bitmap_cache(s); 2190 if (SB_BUFFER_WITH_SB(s)) 2191 brelse(SB_BUFFER_WITH_SB(s)); 2192 #ifdef CONFIG_QUOTA 2193 { 2194 int j; 2195 for (j = 0; j < REISERFS_MAXQUOTAS; j++) 2196 kfree(qf_names[j]); 2197 } 2198 #endif 2199 kfree(sbi); 2200 2201 s->s_fs_info = NULL; 2202 return errval; 2203 } 2204 2205 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2206 { 2207 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb); 2208 2209 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize)); 2210 buf->f_bfree = sb_free_blocks(rs); 2211 buf->f_bavail = buf->f_bfree; 2212 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1; 2213 buf->f_bsize = dentry->d_sb->s_blocksize; 2214 /* changed to accommodate gcc folks. */ 2215 buf->f_type = REISERFS_SUPER_MAGIC; 2216 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2); 2217 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2, 2218 sizeof(rs->s_uuid)/2); 2219 2220 return 0; 2221 } 2222 2223 #ifdef CONFIG_QUOTA 2224 static int reiserfs_write_dquot(struct dquot *dquot) 2225 { 2226 struct reiserfs_transaction_handle th; 2227 int ret, err; 2228 int depth; 2229 2230 reiserfs_write_lock(dquot->dq_sb); 2231 ret = 2232 journal_begin(&th, dquot->dq_sb, 2233 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 2234 if (ret) 2235 goto out; 2236 depth = reiserfs_write_unlock_nested(dquot->dq_sb); 2237 ret = dquot_commit(dquot); 2238 reiserfs_write_lock_nested(dquot->dq_sb, depth); 2239 err = journal_end(&th); 2240 if (!ret && err) 2241 ret = err; 2242 out: 2243 reiserfs_write_unlock(dquot->dq_sb); 2244 return ret; 2245 } 2246 2247 static int reiserfs_acquire_dquot(struct dquot *dquot) 2248 { 2249 struct reiserfs_transaction_handle th; 2250 int ret, err; 2251 int depth; 2252 2253 reiserfs_write_lock(dquot->dq_sb); 2254 ret = 2255 journal_begin(&th, dquot->dq_sb, 2256 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 2257 if (ret) 2258 goto out; 2259 depth = reiserfs_write_unlock_nested(dquot->dq_sb); 2260 ret = dquot_acquire(dquot); 2261 reiserfs_write_lock_nested(dquot->dq_sb, depth); 2262 err = journal_end(&th); 2263 if (!ret && err) 2264 ret = err; 2265 out: 2266 reiserfs_write_unlock(dquot->dq_sb); 2267 return ret; 2268 } 2269 2270 static int reiserfs_release_dquot(struct dquot *dquot) 2271 { 2272 struct reiserfs_transaction_handle th; 2273 int ret, err; 2274 2275 reiserfs_write_lock(dquot->dq_sb); 2276 ret = 2277 journal_begin(&th, dquot->dq_sb, 2278 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 2279 reiserfs_write_unlock(dquot->dq_sb); 2280 if (ret) { 2281 /* Release dquot anyway to avoid endless cycle in dqput() */ 2282 dquot_release(dquot); 2283 goto out; 2284 } 2285 ret = dquot_release(dquot); 2286 reiserfs_write_lock(dquot->dq_sb); 2287 err = journal_end(&th); 2288 if (!ret && err) 2289 ret = err; 2290 reiserfs_write_unlock(dquot->dq_sb); 2291 out: 2292 return ret; 2293 } 2294 2295 static int reiserfs_mark_dquot_dirty(struct dquot *dquot) 2296 { 2297 /* Are we journaling quotas? */ 2298 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 2299 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 2300 dquot_mark_dquot_dirty(dquot); 2301 return reiserfs_write_dquot(dquot); 2302 } else 2303 return dquot_mark_dquot_dirty(dquot); 2304 } 2305 2306 static int reiserfs_write_info(struct super_block *sb, int type) 2307 { 2308 struct reiserfs_transaction_handle th; 2309 int ret, err; 2310 int depth; 2311 2312 /* Data block + inode block */ 2313 reiserfs_write_lock(sb); 2314 ret = journal_begin(&th, sb, 2); 2315 if (ret) 2316 goto out; 2317 depth = reiserfs_write_unlock_nested(sb); 2318 ret = dquot_commit_info(sb, type); 2319 reiserfs_write_lock_nested(sb, depth); 2320 err = journal_end(&th); 2321 if (!ret && err) 2322 ret = err; 2323 out: 2324 reiserfs_write_unlock(sb); 2325 return ret; 2326 } 2327 2328 /* 2329 * Turn on quotas during mount time - we need to find the quota file and such... 2330 */ 2331 static int reiserfs_quota_on_mount(struct super_block *sb, int type) 2332 { 2333 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type], 2334 REISERFS_SB(sb)->s_jquota_fmt, type); 2335 } 2336 2337 /* 2338 * Standard function to be called on quota_on 2339 */ 2340 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id, 2341 struct path *path) 2342 { 2343 int err; 2344 struct inode *inode; 2345 struct reiserfs_transaction_handle th; 2346 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA; 2347 2348 reiserfs_write_lock(sb); 2349 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) { 2350 err = -EINVAL; 2351 goto out; 2352 } 2353 2354 /* Quotafile not on the same filesystem? */ 2355 if (path->dentry->d_sb != sb) { 2356 err = -EXDEV; 2357 goto out; 2358 } 2359 inode = d_inode(path->dentry); 2360 /* 2361 * We must not pack tails for quota files on reiserfs for quota 2362 * IO to work 2363 */ 2364 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) { 2365 err = reiserfs_unpack(inode, NULL); 2366 if (err) { 2367 reiserfs_warning(sb, "super-6520", 2368 "Unpacking tail of quota file failed" 2369 " (%d). Cannot turn on quotas.", err); 2370 err = -EINVAL; 2371 goto out; 2372 } 2373 mark_inode_dirty(inode); 2374 } 2375 /* Journaling quota? */ 2376 if (REISERFS_SB(sb)->s_qf_names[type]) { 2377 /* Quotafile not of fs root? */ 2378 if (path->dentry->d_parent != sb->s_root) 2379 reiserfs_warning(sb, "super-6521", 2380 "Quota file not on filesystem root. " 2381 "Journalled quota will not work."); 2382 } 2383 2384 /* 2385 * When we journal data on quota file, we have to flush journal to see 2386 * all updates to the file when we bypass pagecache... 2387 */ 2388 if (reiserfs_file_data_log(inode)) { 2389 /* Just start temporary transaction and finish it */ 2390 err = journal_begin(&th, sb, 1); 2391 if (err) 2392 goto out; 2393 err = journal_end_sync(&th); 2394 if (err) 2395 goto out; 2396 } 2397 reiserfs_write_unlock(sb); 2398 return dquot_quota_on(sb, type, format_id, path); 2399 out: 2400 reiserfs_write_unlock(sb); 2401 return err; 2402 } 2403 2404 /* 2405 * Read data from quotafile - avoid pagecache and such because we cannot afford 2406 * acquiring the locks... As quota files are never truncated and quota code 2407 * itself serializes the operations (and no one else should touch the files) 2408 * we don't have to be afraid of races 2409 */ 2410 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data, 2411 size_t len, loff_t off) 2412 { 2413 struct inode *inode = sb_dqopt(sb)->files[type]; 2414 unsigned long blk = off >> sb->s_blocksize_bits; 2415 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; 2416 size_t toread; 2417 struct buffer_head tmp_bh, *bh; 2418 loff_t i_size = i_size_read(inode); 2419 2420 if (off > i_size) 2421 return 0; 2422 if (off + len > i_size) 2423 len = i_size - off; 2424 toread = len; 2425 while (toread > 0) { 2426 tocopy = 2427 sb->s_blocksize - offset < 2428 toread ? sb->s_blocksize - offset : toread; 2429 tmp_bh.b_state = 0; 2430 /* 2431 * Quota files are without tails so we can safely 2432 * use this function 2433 */ 2434 reiserfs_write_lock(sb); 2435 err = reiserfs_get_block(inode, blk, &tmp_bh, 0); 2436 reiserfs_write_unlock(sb); 2437 if (err) 2438 return err; 2439 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 2440 memset(data, 0, tocopy); 2441 else { 2442 bh = sb_bread(sb, tmp_bh.b_blocknr); 2443 if (!bh) 2444 return -EIO; 2445 memcpy(data, bh->b_data + offset, tocopy); 2446 brelse(bh); 2447 } 2448 offset = 0; 2449 toread -= tocopy; 2450 data += tocopy; 2451 blk++; 2452 } 2453 return len; 2454 } 2455 2456 /* 2457 * Write to quotafile (we know the transaction is already started and has 2458 * enough credits) 2459 */ 2460 static ssize_t reiserfs_quota_write(struct super_block *sb, int type, 2461 const char *data, size_t len, loff_t off) 2462 { 2463 struct inode *inode = sb_dqopt(sb)->files[type]; 2464 unsigned long blk = off >> sb->s_blocksize_bits; 2465 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; 2466 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL; 2467 size_t towrite = len; 2468 struct buffer_head tmp_bh, *bh; 2469 2470 if (!current->journal_info) { 2471 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n", 2472 (unsigned long long)off, (unsigned long long)len); 2473 return -EIO; 2474 } 2475 while (towrite > 0) { 2476 tocopy = sb->s_blocksize - offset < towrite ? 2477 sb->s_blocksize - offset : towrite; 2478 tmp_bh.b_state = 0; 2479 reiserfs_write_lock(sb); 2480 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE); 2481 reiserfs_write_unlock(sb); 2482 if (err) 2483 goto out; 2484 if (offset || tocopy != sb->s_blocksize) 2485 bh = sb_bread(sb, tmp_bh.b_blocknr); 2486 else 2487 bh = sb_getblk(sb, tmp_bh.b_blocknr); 2488 if (!bh) { 2489 err = -EIO; 2490 goto out; 2491 } 2492 lock_buffer(bh); 2493 memcpy(bh->b_data + offset, data, tocopy); 2494 flush_dcache_page(bh->b_page); 2495 set_buffer_uptodate(bh); 2496 unlock_buffer(bh); 2497 reiserfs_write_lock(sb); 2498 reiserfs_prepare_for_journal(sb, bh, 1); 2499 journal_mark_dirty(current->journal_info, bh); 2500 if (!journal_quota) 2501 reiserfs_add_ordered_list(inode, bh); 2502 reiserfs_write_unlock(sb); 2503 brelse(bh); 2504 offset = 0; 2505 towrite -= tocopy; 2506 data += tocopy; 2507 blk++; 2508 } 2509 out: 2510 if (len == towrite) 2511 return err; 2512 if (inode->i_size < off + len - towrite) 2513 i_size_write(inode, off + len - towrite); 2514 inode->i_version++; 2515 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2516 mark_inode_dirty(inode); 2517 return len - towrite; 2518 } 2519 2520 #endif 2521 2522 static struct dentry *get_super_block(struct file_system_type *fs_type, 2523 int flags, const char *dev_name, 2524 void *data) 2525 { 2526 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super); 2527 } 2528 2529 static int __init init_reiserfs_fs(void) 2530 { 2531 int ret; 2532 2533 ret = init_inodecache(); 2534 if (ret) 2535 return ret; 2536 2537 reiserfs_proc_info_global_init(); 2538 2539 ret = register_filesystem(&reiserfs_fs_type); 2540 if (ret) 2541 goto out; 2542 2543 return 0; 2544 out: 2545 reiserfs_proc_info_global_done(); 2546 destroy_inodecache(); 2547 2548 return ret; 2549 } 2550 2551 static void __exit exit_reiserfs_fs(void) 2552 { 2553 reiserfs_proc_info_global_done(); 2554 unregister_filesystem(&reiserfs_fs_type); 2555 destroy_inodecache(); 2556 } 2557 2558 struct file_system_type reiserfs_fs_type = { 2559 .owner = THIS_MODULE, 2560 .name = "reiserfs", 2561 .mount = get_super_block, 2562 .kill_sb = reiserfs_kill_sb, 2563 .fs_flags = FS_REQUIRES_DEV, 2564 }; 2565 MODULE_ALIAS_FS("reiserfs"); 2566 2567 MODULE_DESCRIPTION("ReiserFS journaled filesystem"); 2568 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>"); 2569 MODULE_LICENSE("GPL"); 2570 2571 module_init(init_reiserfs_fs); 2572 module_exit(exit_reiserfs_fs); 2573