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 }; 806 807 static const struct quotactl_ops reiserfs_qctl_operations = { 808 .quota_on = reiserfs_quota_on, 809 .quota_off = dquot_quota_off, 810 .quota_sync = dquot_quota_sync, 811 .get_state = dquot_get_state, 812 .set_info = dquot_set_dqinfo, 813 .get_dqblk = dquot_get_dqblk, 814 .set_dqblk = dquot_set_dqblk, 815 }; 816 #endif 817 818 static const struct export_operations reiserfs_export_ops = { 819 .encode_fh = reiserfs_encode_fh, 820 .fh_to_dentry = reiserfs_fh_to_dentry, 821 .fh_to_parent = reiserfs_fh_to_parent, 822 .get_parent = reiserfs_get_parent, 823 }; 824 825 /* 826 * this struct is used in reiserfs_getopt () for containing the value for 827 * those mount options that have values rather than being toggles. 828 */ 829 typedef struct { 830 char *value; 831 /* 832 * bitmask which is to set on mount_options bitmask 833 * when this value is found, 0 is no bits are to be changed. 834 */ 835 int setmask; 836 /* 837 * bitmask which is to clear on mount_options bitmask 838 * when this value is found, 0 is no bits are to be changed. 839 * This is applied BEFORE setmask 840 */ 841 int clrmask; 842 } arg_desc_t; 843 844 /* Set this bit in arg_required to allow empty arguments */ 845 #define REISERFS_OPT_ALLOWEMPTY 31 846 847 /* 848 * this struct is used in reiserfs_getopt() for describing the 849 * set of reiserfs mount options 850 */ 851 typedef struct { 852 char *option_name; 853 854 /* 0 if argument is not required, not 0 otherwise */ 855 int arg_required; 856 857 /* list of values accepted by an option */ 858 const arg_desc_t *values; 859 860 /* 861 * bitmask which is to set on mount_options bitmask 862 * when this value is found, 0 is no bits are to be changed. 863 */ 864 int setmask; 865 866 /* 867 * bitmask which is to clear on mount_options bitmask 868 * when this value is found, 0 is no bits are to be changed. 869 * This is applied BEFORE setmask 870 */ 871 int clrmask; 872 } opt_desc_t; 873 874 /* possible values for -o data= */ 875 static const arg_desc_t logging_mode[] = { 876 {"ordered", 1 << REISERFS_DATA_ORDERED, 877 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)}, 878 {"journal", 1 << REISERFS_DATA_LOG, 879 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)}, 880 {"writeback", 1 << REISERFS_DATA_WRITEBACK, 881 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)}, 882 {.value = NULL} 883 }; 884 885 /* possible values for -o barrier= */ 886 static const arg_desc_t barrier_mode[] = { 887 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH}, 888 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE}, 889 {.value = NULL} 890 }; 891 892 /* 893 * possible values for "-o block-allocator=" and bits which are to be set in 894 * s_mount_opt of reiserfs specific part of in-core super block 895 */ 896 static const arg_desc_t balloc[] = { 897 {"noborder", 1 << REISERFS_NO_BORDER, 0}, 898 {"border", 0, 1 << REISERFS_NO_BORDER}, 899 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0}, 900 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0}, 901 {"test4", 1 << REISERFS_TEST4, 0}, 902 {"notest4", 0, 1 << REISERFS_TEST4}, 903 {NULL, 0, 0} 904 }; 905 906 static const arg_desc_t tails[] = { 907 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL}, 908 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, 909 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL}, 910 {NULL, 0, 0} 911 }; 912 913 static const arg_desc_t error_actions[] = { 914 {"panic", 1 << REISERFS_ERROR_PANIC, 915 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)}, 916 {"ro-remount", 1 << REISERFS_ERROR_RO, 917 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)}, 918 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG 919 {"continue", 1 << REISERFS_ERROR_CONTINUE, 920 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)}, 921 #endif 922 {NULL, 0, 0}, 923 }; 924 925 /* 926 * proceed only one option from a list *cur - string containing of mount 927 * options 928 * opts - array of options which are accepted 929 * opt_arg - if option is found and requires an argument and if it is specifed 930 * in the input - pointer to the argument is stored here 931 * bit_flags - if option requires to set a certain bit - it is set here 932 * return -1 if unknown option is found, opt->arg_required otherwise 933 */ 934 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts, 935 char **opt_arg, unsigned long *bit_flags) 936 { 937 char *p; 938 /* 939 * foo=bar, 940 * ^ ^ ^ 941 * | | +-- option_end 942 * | +-- arg_start 943 * +-- option_start 944 */ 945 const opt_desc_t *opt; 946 const arg_desc_t *arg; 947 948 p = *cur; 949 950 /* assume argument cannot contain commas */ 951 *cur = strchr(p, ','); 952 if (*cur) { 953 *(*cur) = '\0'; 954 (*cur)++; 955 } 956 957 if (!strncmp(p, "alloc=", 6)) { 958 /* 959 * Ugly special case, probably we should redo options 960 * parser so that it can understand several arguments for 961 * some options, also so that it can fill several bitfields 962 * with option values. 963 */ 964 if (reiserfs_parse_alloc_options(s, p + 6)) { 965 return -1; 966 } else { 967 return 0; 968 } 969 } 970 971 /* for every option in the list */ 972 for (opt = opts; opt->option_name; opt++) { 973 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) { 974 if (bit_flags) { 975 if (opt->clrmask == 976 (1 << REISERFS_UNSUPPORTED_OPT)) 977 reiserfs_warning(s, "super-6500", 978 "%s not supported.\n", 979 p); 980 else 981 *bit_flags &= ~opt->clrmask; 982 if (opt->setmask == 983 (1 << REISERFS_UNSUPPORTED_OPT)) 984 reiserfs_warning(s, "super-6501", 985 "%s not supported.\n", 986 p); 987 else 988 *bit_flags |= opt->setmask; 989 } 990 break; 991 } 992 } 993 if (!opt->option_name) { 994 reiserfs_warning(s, "super-6502", 995 "unknown mount option \"%s\"", p); 996 return -1; 997 } 998 999 p += strlen(opt->option_name); 1000 switch (*p) { 1001 case '=': 1002 if (!opt->arg_required) { 1003 reiserfs_warning(s, "super-6503", 1004 "the option \"%s\" does not " 1005 "require an argument\n", 1006 opt->option_name); 1007 return -1; 1008 } 1009 break; 1010 1011 case 0: 1012 if (opt->arg_required) { 1013 reiserfs_warning(s, "super-6504", 1014 "the option \"%s\" requires an " 1015 "argument\n", opt->option_name); 1016 return -1; 1017 } 1018 break; 1019 default: 1020 reiserfs_warning(s, "super-6505", 1021 "head of option \"%s\" is only correct\n", 1022 opt->option_name); 1023 return -1; 1024 } 1025 1026 /* 1027 * move to the argument, or to next option if argument is not 1028 * required 1029 */ 1030 p++; 1031 1032 if (opt->arg_required 1033 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY)) 1034 && !strlen(p)) { 1035 /* this catches "option=," if not allowed */ 1036 reiserfs_warning(s, "super-6506", 1037 "empty argument for \"%s\"\n", 1038 opt->option_name); 1039 return -1; 1040 } 1041 1042 if (!opt->values) { 1043 /* *=NULLopt_arg contains pointer to argument */ 1044 *opt_arg = p; 1045 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY); 1046 } 1047 1048 /* values possible for this option are listed in opt->values */ 1049 for (arg = opt->values; arg->value; arg++) { 1050 if (!strcmp(p, arg->value)) { 1051 if (bit_flags) { 1052 *bit_flags &= ~arg->clrmask; 1053 *bit_flags |= arg->setmask; 1054 } 1055 return opt->arg_required; 1056 } 1057 } 1058 1059 reiserfs_warning(s, "super-6506", 1060 "bad value \"%s\" for option \"%s\"\n", p, 1061 opt->option_name); 1062 return -1; 1063 } 1064 1065 /* returns 0 if something is wrong in option string, 1 - otherwise */ 1066 static int reiserfs_parse_options(struct super_block *s, 1067 1068 /* string given via mount's -o */ 1069 char *options, 1070 1071 /* 1072 * after the parsing phase, contains the 1073 * collection of bitflags defining what 1074 * mount options were selected. 1075 */ 1076 unsigned long *mount_options, 1077 1078 /* strtol-ed from NNN of resize=NNN */ 1079 unsigned long *blocks, 1080 char **jdev_name, 1081 unsigned int *commit_max_age, 1082 char **qf_names, 1083 unsigned int *qfmt) 1084 { 1085 int c; 1086 char *arg = NULL; 1087 char *pos; 1088 opt_desc_t opts[] = { 1089 /* 1090 * Compatibility stuff, so that -o notail for old 1091 * setups still work 1092 */ 1093 {"tails",.arg_required = 't',.values = tails}, 1094 {"notail",.clrmask = 1095 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, 1096 {"conv",.setmask = 1 << REISERFS_CONVERT}, 1097 {"attrs",.setmask = 1 << REISERFS_ATTRS}, 1098 {"noattrs",.clrmask = 1 << REISERFS_ATTRS}, 1099 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT}, 1100 #ifdef CONFIG_REISERFS_FS_XATTR 1101 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER}, 1102 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER}, 1103 #else 1104 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1105 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1106 #endif 1107 #ifdef CONFIG_REISERFS_FS_POSIX_ACL 1108 {"acl",.setmask = 1 << REISERFS_POSIXACL}, 1109 {"noacl",.clrmask = 1 << REISERFS_POSIXACL}, 1110 #else 1111 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1112 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1113 #endif 1114 {.option_name = "nolog"}, 1115 {"replayonly",.setmask = 1 << REPLAYONLY}, 1116 {"block-allocator",.arg_required = 'a',.values = balloc}, 1117 {"data",.arg_required = 'd',.values = logging_mode}, 1118 {"barrier",.arg_required = 'b',.values = barrier_mode}, 1119 {"resize",.arg_required = 'r',.values = NULL}, 1120 {"jdev",.arg_required = 'j',.values = NULL}, 1121 {"nolargeio",.arg_required = 'w',.values = NULL}, 1122 {"commit",.arg_required = 'c',.values = NULL}, 1123 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA}, 1124 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA}, 1125 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA}, 1126 {"errors",.arg_required = 'e',.values = error_actions}, 1127 {"usrjquota",.arg_required = 1128 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, 1129 {"grpjquota",.arg_required = 1130 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, 1131 {"jqfmt",.arg_required = 'f',.values = NULL}, 1132 {.option_name = NULL} 1133 }; 1134 1135 *blocks = 0; 1136 if (!options || !*options) 1137 /* 1138 * use default configuration: create tails, journaling on, no 1139 * conversion to newest format 1140 */ 1141 return 1; 1142 1143 for (pos = options; pos;) { 1144 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options); 1145 if (c == -1) 1146 /* wrong option is given */ 1147 return 0; 1148 1149 if (c == 'r') { 1150 char *p; 1151 1152 p = NULL; 1153 /* "resize=NNN" or "resize=auto" */ 1154 1155 if (!strcmp(arg, "auto")) { 1156 /* From JFS code, to auto-get the size. */ 1157 *blocks = 1158 s->s_bdev->bd_inode->i_size >> s-> 1159 s_blocksize_bits; 1160 } else { 1161 *blocks = simple_strtoul(arg, &p, 0); 1162 if (*p != '\0') { 1163 /* NNN does not look like a number */ 1164 reiserfs_warning(s, "super-6507", 1165 "bad value %s for " 1166 "-oresize\n", arg); 1167 return 0; 1168 } 1169 } 1170 } 1171 1172 if (c == 'c') { 1173 char *p = NULL; 1174 unsigned long val = simple_strtoul(arg, &p, 0); 1175 /* commit=NNN (time in seconds) */ 1176 if (*p != '\0' || val >= (unsigned int)-1) { 1177 reiserfs_warning(s, "super-6508", 1178 "bad value %s for -ocommit\n", 1179 arg); 1180 return 0; 1181 } 1182 *commit_max_age = (unsigned int)val; 1183 } 1184 1185 if (c == 'w') { 1186 reiserfs_warning(s, "super-6509", "nolargeio option " 1187 "is no longer supported"); 1188 return 0; 1189 } 1190 1191 if (c == 'j') { 1192 if (arg && *arg && jdev_name) { 1193 /* Hm, already assigned? */ 1194 if (*jdev_name) { 1195 reiserfs_warning(s, "super-6510", 1196 "journal device was " 1197 "already specified to " 1198 "be %s", *jdev_name); 1199 return 0; 1200 } 1201 *jdev_name = arg; 1202 } 1203 } 1204 #ifdef CONFIG_QUOTA 1205 if (c == 'u' || c == 'g') { 1206 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA; 1207 1208 if (sb_any_quota_loaded(s) && 1209 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) { 1210 reiserfs_warning(s, "super-6511", 1211 "cannot change journaled " 1212 "quota options when quota " 1213 "turned on."); 1214 return 0; 1215 } 1216 if (*arg) { /* Some filename specified? */ 1217 if (REISERFS_SB(s)->s_qf_names[qtype] 1218 && strcmp(REISERFS_SB(s)->s_qf_names[qtype], 1219 arg)) { 1220 reiserfs_warning(s, "super-6512", 1221 "%s quota file " 1222 "already specified.", 1223 QTYPE2NAME(qtype)); 1224 return 0; 1225 } 1226 if (strchr(arg, '/')) { 1227 reiserfs_warning(s, "super-6513", 1228 "quotafile must be " 1229 "on filesystem root."); 1230 return 0; 1231 } 1232 qf_names[qtype] = kstrdup(arg, GFP_KERNEL); 1233 if (!qf_names[qtype]) { 1234 reiserfs_warning(s, "reiserfs-2502", 1235 "not enough memory " 1236 "for storing " 1237 "quotafile name."); 1238 return 0; 1239 } 1240 if (qtype == USRQUOTA) 1241 *mount_options |= 1 << REISERFS_USRQUOTA; 1242 else 1243 *mount_options |= 1 << REISERFS_GRPQUOTA; 1244 } else { 1245 if (qf_names[qtype] != 1246 REISERFS_SB(s)->s_qf_names[qtype]) 1247 kfree(qf_names[qtype]); 1248 qf_names[qtype] = NULL; 1249 if (qtype == USRQUOTA) 1250 *mount_options &= ~(1 << REISERFS_USRQUOTA); 1251 else 1252 *mount_options &= ~(1 << REISERFS_GRPQUOTA); 1253 } 1254 } 1255 if (c == 'f') { 1256 if (!strcmp(arg, "vfsold")) 1257 *qfmt = QFMT_VFS_OLD; 1258 else if (!strcmp(arg, "vfsv0")) 1259 *qfmt = QFMT_VFS_V0; 1260 else { 1261 reiserfs_warning(s, "super-6514", 1262 "unknown quota format " 1263 "specified."); 1264 return 0; 1265 } 1266 if (sb_any_quota_loaded(s) && 1267 *qfmt != REISERFS_SB(s)->s_jquota_fmt) { 1268 reiserfs_warning(s, "super-6515", 1269 "cannot change journaled " 1270 "quota options when quota " 1271 "turned on."); 1272 return 0; 1273 } 1274 } 1275 #else 1276 if (c == 'u' || c == 'g' || c == 'f') { 1277 reiserfs_warning(s, "reiserfs-2503", "journaled " 1278 "quota options not supported."); 1279 return 0; 1280 } 1281 #endif 1282 } 1283 1284 #ifdef CONFIG_QUOTA 1285 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt 1286 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) { 1287 reiserfs_warning(s, "super-6515", 1288 "journaled quota format not specified."); 1289 return 0; 1290 } 1291 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) && 1292 sb_has_quota_loaded(s, USRQUOTA)) || 1293 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) && 1294 sb_has_quota_loaded(s, GRPQUOTA))) { 1295 reiserfs_warning(s, "super-6516", "quota options must " 1296 "be present when quota is turned on."); 1297 return 0; 1298 } 1299 #endif 1300 1301 return 1; 1302 } 1303 1304 static void switch_data_mode(struct super_block *s, unsigned long mode) 1305 { 1306 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) | 1307 (1 << REISERFS_DATA_ORDERED) | 1308 (1 << REISERFS_DATA_WRITEBACK)); 1309 REISERFS_SB(s)->s_mount_opt |= (1 << mode); 1310 } 1311 1312 static void handle_data_mode(struct super_block *s, unsigned long mount_options) 1313 { 1314 if (mount_options & (1 << REISERFS_DATA_LOG)) { 1315 if (!reiserfs_data_log(s)) { 1316 switch_data_mode(s, REISERFS_DATA_LOG); 1317 reiserfs_info(s, "switching to journaled data mode\n"); 1318 } 1319 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) { 1320 if (!reiserfs_data_ordered(s)) { 1321 switch_data_mode(s, REISERFS_DATA_ORDERED); 1322 reiserfs_info(s, "switching to ordered data mode\n"); 1323 } 1324 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) { 1325 if (!reiserfs_data_writeback(s)) { 1326 switch_data_mode(s, REISERFS_DATA_WRITEBACK); 1327 reiserfs_info(s, "switching to writeback data mode\n"); 1328 } 1329 } 1330 } 1331 1332 static void handle_barrier_mode(struct super_block *s, unsigned long bits) 1333 { 1334 int flush = (1 << REISERFS_BARRIER_FLUSH); 1335 int none = (1 << REISERFS_BARRIER_NONE); 1336 int all_barrier = flush | none; 1337 1338 if (bits & all_barrier) { 1339 REISERFS_SB(s)->s_mount_opt &= ~all_barrier; 1340 if (bits & flush) { 1341 REISERFS_SB(s)->s_mount_opt |= flush; 1342 printk("reiserfs: enabling write barrier flush mode\n"); 1343 } else if (bits & none) { 1344 REISERFS_SB(s)->s_mount_opt |= none; 1345 printk("reiserfs: write barriers turned off\n"); 1346 } 1347 } 1348 } 1349 1350 static void handle_attrs(struct super_block *s) 1351 { 1352 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s); 1353 1354 if (reiserfs_attrs(s)) { 1355 if (old_format_only(s)) { 1356 reiserfs_warning(s, "super-6517", "cannot support " 1357 "attributes on 3.5.x disk format"); 1358 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); 1359 return; 1360 } 1361 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) { 1362 reiserfs_warning(s, "super-6518", "cannot support " 1363 "attributes until flag is set in " 1364 "super-block"); 1365 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); 1366 } 1367 } 1368 } 1369 1370 #ifdef CONFIG_QUOTA 1371 static void handle_quota_files(struct super_block *s, char **qf_names, 1372 unsigned int *qfmt) 1373 { 1374 int i; 1375 1376 for (i = 0; i < REISERFS_MAXQUOTAS; i++) { 1377 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) 1378 kfree(REISERFS_SB(s)->s_qf_names[i]); 1379 REISERFS_SB(s)->s_qf_names[i] = qf_names[i]; 1380 } 1381 if (*qfmt) 1382 REISERFS_SB(s)->s_jquota_fmt = *qfmt; 1383 } 1384 #endif 1385 1386 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg) 1387 { 1388 struct reiserfs_super_block *rs; 1389 struct reiserfs_transaction_handle th; 1390 unsigned long blocks; 1391 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt; 1392 unsigned long safe_mask = 0; 1393 unsigned int commit_max_age = (unsigned int)-1; 1394 struct reiserfs_journal *journal = SB_JOURNAL(s); 1395 char *new_opts = kstrdup(arg, GFP_KERNEL); 1396 int err; 1397 char *qf_names[REISERFS_MAXQUOTAS]; 1398 unsigned int qfmt = 0; 1399 #ifdef CONFIG_QUOTA 1400 int i; 1401 #endif 1402 1403 sync_filesystem(s); 1404 reiserfs_write_lock(s); 1405 1406 #ifdef CONFIG_QUOTA 1407 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names)); 1408 #endif 1409 1410 rs = SB_DISK_SUPER_BLOCK(s); 1411 1412 if (!reiserfs_parse_options 1413 (s, arg, &mount_options, &blocks, NULL, &commit_max_age, 1414 qf_names, &qfmt)) { 1415 #ifdef CONFIG_QUOTA 1416 for (i = 0; i < REISERFS_MAXQUOTAS; i++) 1417 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) 1418 kfree(qf_names[i]); 1419 #endif 1420 err = -EINVAL; 1421 goto out_err_unlock; 1422 } 1423 #ifdef CONFIG_QUOTA 1424 handle_quota_files(s, qf_names, &qfmt); 1425 #endif 1426 1427 handle_attrs(s); 1428 1429 /* Add options that are safe here */ 1430 safe_mask |= 1 << REISERFS_SMALLTAIL; 1431 safe_mask |= 1 << REISERFS_LARGETAIL; 1432 safe_mask |= 1 << REISERFS_NO_BORDER; 1433 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION; 1434 safe_mask |= 1 << REISERFS_HASHED_RELOCATION; 1435 safe_mask |= 1 << REISERFS_TEST4; 1436 safe_mask |= 1 << REISERFS_ATTRS; 1437 safe_mask |= 1 << REISERFS_XATTRS_USER; 1438 safe_mask |= 1 << REISERFS_POSIXACL; 1439 safe_mask |= 1 << REISERFS_BARRIER_FLUSH; 1440 safe_mask |= 1 << REISERFS_BARRIER_NONE; 1441 safe_mask |= 1 << REISERFS_ERROR_RO; 1442 safe_mask |= 1 << REISERFS_ERROR_CONTINUE; 1443 safe_mask |= 1 << REISERFS_ERROR_PANIC; 1444 safe_mask |= 1 << REISERFS_USRQUOTA; 1445 safe_mask |= 1 << REISERFS_GRPQUOTA; 1446 1447 /* 1448 * Update the bitmask, taking care to keep 1449 * the bits we're not allowed to change here 1450 */ 1451 REISERFS_SB(s)->s_mount_opt = 1452 (REISERFS_SB(s)-> 1453 s_mount_opt & ~safe_mask) | (mount_options & safe_mask); 1454 1455 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) { 1456 journal->j_max_commit_age = commit_max_age; 1457 journal->j_max_trans_age = commit_max_age; 1458 } else if (commit_max_age == 0) { 1459 /* 0 means restore defaults. */ 1460 journal->j_max_commit_age = journal->j_default_max_commit_age; 1461 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; 1462 } 1463 1464 if (blocks) { 1465 err = reiserfs_resize(s, blocks); 1466 if (err != 0) 1467 goto out_err_unlock; 1468 } 1469 1470 if (*mount_flags & MS_RDONLY) { 1471 reiserfs_write_unlock(s); 1472 reiserfs_xattr_init(s, *mount_flags); 1473 /* remount read-only */ 1474 if (s->s_flags & MS_RDONLY) 1475 /* it is read-only already */ 1476 goto out_ok_unlocked; 1477 1478 err = dquot_suspend(s, -1); 1479 if (err < 0) 1480 goto out_err; 1481 1482 /* try to remount file system with read-only permissions */ 1483 if (sb_umount_state(rs) == REISERFS_VALID_FS 1484 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) { 1485 goto out_ok_unlocked; 1486 } 1487 1488 reiserfs_write_lock(s); 1489 1490 err = journal_begin(&th, s, 10); 1491 if (err) 1492 goto out_err_unlock; 1493 1494 /* Mounting a rw partition read-only. */ 1495 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 1496 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state); 1497 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 1498 } else { 1499 /* remount read-write */ 1500 if (!(s->s_flags & MS_RDONLY)) { 1501 reiserfs_write_unlock(s); 1502 reiserfs_xattr_init(s, *mount_flags); 1503 goto out_ok_unlocked; /* We are read-write already */ 1504 } 1505 1506 if (reiserfs_is_journal_aborted(journal)) { 1507 err = journal->j_errno; 1508 goto out_err_unlock; 1509 } 1510 1511 handle_data_mode(s, mount_options); 1512 handle_barrier_mode(s, mount_options); 1513 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); 1514 1515 /* now it is safe to call journal_begin */ 1516 s->s_flags &= ~MS_RDONLY; 1517 err = journal_begin(&th, s, 10); 1518 if (err) 1519 goto out_err_unlock; 1520 1521 /* Mount a partition which is read-only, read-write */ 1522 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 1523 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); 1524 s->s_flags &= ~MS_RDONLY; 1525 set_sb_umount_state(rs, REISERFS_ERROR_FS); 1526 if (!old_format_only(s)) 1527 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); 1528 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */ 1529 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 1530 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS; 1531 } 1532 /* this will force a full flush of all journal lists */ 1533 SB_JOURNAL(s)->j_must_wait = 1; 1534 err = journal_end(&th); 1535 if (err) 1536 goto out_err_unlock; 1537 1538 reiserfs_write_unlock(s); 1539 if (!(*mount_flags & MS_RDONLY)) { 1540 dquot_resume(s, -1); 1541 reiserfs_write_lock(s); 1542 finish_unfinished(s); 1543 reiserfs_write_unlock(s); 1544 reiserfs_xattr_init(s, *mount_flags); 1545 } 1546 1547 out_ok_unlocked: 1548 replace_mount_options(s, new_opts); 1549 return 0; 1550 1551 out_err_unlock: 1552 reiserfs_write_unlock(s); 1553 out_err: 1554 kfree(new_opts); 1555 return err; 1556 } 1557 1558 static int read_super_block(struct super_block *s, int offset) 1559 { 1560 struct buffer_head *bh; 1561 struct reiserfs_super_block *rs; 1562 int fs_blocksize; 1563 1564 bh = sb_bread(s, offset / s->s_blocksize); 1565 if (!bh) { 1566 reiserfs_warning(s, "sh-2006", 1567 "bread failed (dev %s, block %lu, size %lu)", 1568 s->s_id, offset / s->s_blocksize, 1569 s->s_blocksize); 1570 return 1; 1571 } 1572 1573 rs = (struct reiserfs_super_block *)bh->b_data; 1574 if (!is_any_reiserfs_magic_string(rs)) { 1575 brelse(bh); 1576 return 1; 1577 } 1578 /* 1579 * ok, reiserfs signature (old or new) found in at the given offset 1580 */ 1581 fs_blocksize = sb_blocksize(rs); 1582 brelse(bh); 1583 sb_set_blocksize(s, fs_blocksize); 1584 1585 bh = sb_bread(s, offset / s->s_blocksize); 1586 if (!bh) { 1587 reiserfs_warning(s, "sh-2007", 1588 "bread failed (dev %s, block %lu, size %lu)", 1589 s->s_id, offset / s->s_blocksize, 1590 s->s_blocksize); 1591 return 1; 1592 } 1593 1594 rs = (struct reiserfs_super_block *)bh->b_data; 1595 if (sb_blocksize(rs) != s->s_blocksize) { 1596 reiserfs_warning(s, "sh-2011", "can't find a reiserfs " 1597 "filesystem on (dev %s, block %llu, size %lu)", 1598 s->s_id, 1599 (unsigned long long)bh->b_blocknr, 1600 s->s_blocksize); 1601 brelse(bh); 1602 return 1; 1603 } 1604 1605 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) { 1606 brelse(bh); 1607 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck " 1608 "--rebuild-tree run detected. Please run\n" 1609 "reiserfsck --rebuild-tree and wait for a " 1610 "completion. If that fails\n" 1611 "get newer reiserfsprogs package"); 1612 return 1; 1613 } 1614 1615 SB_BUFFER_WITH_SB(s) = bh; 1616 SB_DISK_SUPER_BLOCK(s) = rs; 1617 1618 /* 1619 * magic is of non-standard journal filesystem, look at s_version to 1620 * find which format is in use 1621 */ 1622 if (is_reiserfs_jr(rs)) { 1623 if (sb_version(rs) == REISERFS_VERSION_2) 1624 reiserfs_info(s, "found reiserfs format \"3.6\"" 1625 " with non-standard journal\n"); 1626 else if (sb_version(rs) == REISERFS_VERSION_1) 1627 reiserfs_info(s, "found reiserfs format \"3.5\"" 1628 " with non-standard journal\n"); 1629 else { 1630 reiserfs_warning(s, "sh-2012", "found unknown " 1631 "format \"%u\" of reiserfs with " 1632 "non-standard magic", sb_version(rs)); 1633 return 1; 1634 } 1635 } else 1636 /* 1637 * s_version of standard format may contain incorrect 1638 * information, so we just look at the magic string 1639 */ 1640 reiserfs_info(s, 1641 "found reiserfs format \"%s\" with standard journal\n", 1642 is_reiserfs_3_5(rs) ? "3.5" : "3.6"); 1643 1644 s->s_op = &reiserfs_sops; 1645 s->s_export_op = &reiserfs_export_ops; 1646 #ifdef CONFIG_QUOTA 1647 s->s_qcop = &reiserfs_qctl_operations; 1648 s->dq_op = &reiserfs_quota_operations; 1649 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1650 #endif 1651 1652 /* 1653 * new format is limited by the 32 bit wide i_blocks field, want to 1654 * be one full block below that. 1655 */ 1656 s->s_maxbytes = (512LL << 32) - s->s_blocksize; 1657 return 0; 1658 } 1659 1660 /* after journal replay, reread all bitmap and super blocks */ 1661 static int reread_meta_blocks(struct super_block *s) 1662 { 1663 ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s)); 1664 wait_on_buffer(SB_BUFFER_WITH_SB(s)); 1665 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) { 1666 reiserfs_warning(s, "reiserfs-2504", "error reading the super"); 1667 return 1; 1668 } 1669 1670 return 0; 1671 } 1672 1673 /* hash detection stuff */ 1674 1675 /* 1676 * if root directory is empty - we set default - Yura's - hash and 1677 * warn about it 1678 * FIXME: we look for only one name in a directory. If tea and yura 1679 * both have the same value - we ask user to send report to the 1680 * mailing list 1681 */ 1682 static __u32 find_hash_out(struct super_block *s) 1683 { 1684 int retval; 1685 struct inode *inode; 1686 struct cpu_key key; 1687 INITIALIZE_PATH(path); 1688 struct reiserfs_dir_entry de; 1689 struct reiserfs_de_head *deh; 1690 __u32 hash = DEFAULT_HASH; 1691 __u32 deh_hashval, teahash, r5hash, yurahash; 1692 1693 inode = d_inode(s->s_root); 1694 1695 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3); 1696 retval = search_by_entry_key(s, &key, &path, &de); 1697 if (retval == IO_ERROR) { 1698 pathrelse(&path); 1699 return UNSET_HASH; 1700 } 1701 if (retval == NAME_NOT_FOUND) 1702 de.de_entry_num--; 1703 1704 set_de_name_and_namelen(&de); 1705 deh = de.de_deh + de.de_entry_num; 1706 1707 if (deh_offset(deh) == DOT_DOT_OFFSET) { 1708 /* allow override in this case */ 1709 if (reiserfs_rupasov_hash(s)) 1710 hash = YURA_HASH; 1711 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n"); 1712 goto out; 1713 } 1714 1715 deh_hashval = GET_HASH_VALUE(deh_offset(deh)); 1716 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen)); 1717 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen)); 1718 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen)); 1719 1720 if ((teahash == r5hash && deh_hashval == r5hash) || 1721 (teahash == yurahash && deh_hashval == yurahash) || 1722 (r5hash == yurahash && deh_hashval == yurahash)) { 1723 reiserfs_warning(s, "reiserfs-2506", 1724 "Unable to automatically detect hash " 1725 "function. Please mount with -o " 1726 "hash={tea,rupasov,r5}"); 1727 hash = UNSET_HASH; 1728 goto out; 1729 } 1730 1731 if (deh_hashval == yurahash) 1732 hash = YURA_HASH; 1733 else if (deh_hashval == teahash) 1734 hash = TEA_HASH; 1735 else if (deh_hashval == r5hash) 1736 hash = R5_HASH; 1737 else { 1738 reiserfs_warning(s, "reiserfs-2506", 1739 "Unrecognised hash function"); 1740 hash = UNSET_HASH; 1741 } 1742 out: 1743 pathrelse(&path); 1744 return hash; 1745 } 1746 1747 /* finds out which hash names are sorted with */ 1748 static int what_hash(struct super_block *s) 1749 { 1750 __u32 code; 1751 1752 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s)); 1753 1754 /* 1755 * reiserfs_hash_detect() == true if any of the hash mount options 1756 * were used. We must check them to make sure the user isn't 1757 * using a bad hash value 1758 */ 1759 if (code == UNSET_HASH || reiserfs_hash_detect(s)) 1760 code = find_hash_out(s); 1761 1762 if (code != UNSET_HASH && reiserfs_hash_detect(s)) { 1763 /* 1764 * detection has found the hash, and we must check against the 1765 * mount options 1766 */ 1767 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) { 1768 reiserfs_warning(s, "reiserfs-2507", 1769 "Error, %s hash detected, " 1770 "unable to force rupasov hash", 1771 reiserfs_hashname(code)); 1772 code = UNSET_HASH; 1773 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) { 1774 reiserfs_warning(s, "reiserfs-2508", 1775 "Error, %s hash detected, " 1776 "unable to force tea hash", 1777 reiserfs_hashname(code)); 1778 code = UNSET_HASH; 1779 } else if (reiserfs_r5_hash(s) && code != R5_HASH) { 1780 reiserfs_warning(s, "reiserfs-2509", 1781 "Error, %s hash detected, " 1782 "unable to force r5 hash", 1783 reiserfs_hashname(code)); 1784 code = UNSET_HASH; 1785 } 1786 } else { 1787 /* 1788 * find_hash_out was not called or 1789 * could not determine the hash 1790 */ 1791 if (reiserfs_rupasov_hash(s)) { 1792 code = YURA_HASH; 1793 } else if (reiserfs_tea_hash(s)) { 1794 code = TEA_HASH; 1795 } else if (reiserfs_r5_hash(s)) { 1796 code = R5_HASH; 1797 } 1798 } 1799 1800 /* 1801 * if we are mounted RW, and we have a new valid hash code, update 1802 * the super 1803 */ 1804 if (code != UNSET_HASH && 1805 !(s->s_flags & MS_RDONLY) && 1806 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) { 1807 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code); 1808 } 1809 return code; 1810 } 1811 1812 /* return pointer to appropriate function */ 1813 static hashf_t hash_function(struct super_block *s) 1814 { 1815 switch (what_hash(s)) { 1816 case TEA_HASH: 1817 reiserfs_info(s, "Using tea hash to sort names\n"); 1818 return keyed_hash; 1819 case YURA_HASH: 1820 reiserfs_info(s, "Using rupasov hash to sort names\n"); 1821 return yura_hash; 1822 case R5_HASH: 1823 reiserfs_info(s, "Using r5 hash to sort names\n"); 1824 return r5_hash; 1825 } 1826 return NULL; 1827 } 1828 1829 /* this is used to set up correct value for old partitions */ 1830 static int function2code(hashf_t func) 1831 { 1832 if (func == keyed_hash) 1833 return TEA_HASH; 1834 if (func == yura_hash) 1835 return YURA_HASH; 1836 if (func == r5_hash) 1837 return R5_HASH; 1838 1839 BUG(); /* should never happen */ 1840 1841 return 0; 1842 } 1843 1844 #define SWARN(silent, s, id, ...) \ 1845 if (!(silent)) \ 1846 reiserfs_warning(s, id, __VA_ARGS__) 1847 1848 static int reiserfs_fill_super(struct super_block *s, void *data, int silent) 1849 { 1850 struct inode *root_inode; 1851 struct reiserfs_transaction_handle th; 1852 int old_format = 0; 1853 unsigned long blocks; 1854 unsigned int commit_max_age = 0; 1855 int jinit_done = 0; 1856 struct reiserfs_iget_args args; 1857 struct reiserfs_super_block *rs; 1858 char *jdev_name; 1859 struct reiserfs_sb_info *sbi; 1860 int errval = -EINVAL; 1861 char *qf_names[REISERFS_MAXQUOTAS] = {}; 1862 unsigned int qfmt = 0; 1863 1864 save_mount_options(s, data); 1865 1866 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL); 1867 if (!sbi) 1868 return -ENOMEM; 1869 s->s_fs_info = sbi; 1870 /* Set default values for options: non-aggressive tails, RO on errors */ 1871 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL); 1872 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO); 1873 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH); 1874 /* no preallocation minimum, be smart in reiserfs_file_write instead */ 1875 sbi->s_alloc_options.preallocmin = 0; 1876 /* Preallocate by 16 blocks (17-1) at once */ 1877 sbi->s_alloc_options.preallocsize = 17; 1878 /* setup default block allocator options */ 1879 reiserfs_init_alloc_options(s); 1880 1881 spin_lock_init(&sbi->old_work_lock); 1882 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits); 1883 mutex_init(&sbi->lock); 1884 sbi->lock_depth = -1; 1885 1886 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0, 1887 s->s_id); 1888 if (!sbi->commit_wq) { 1889 SWARN(silent, s, "", "Cannot allocate commit workqueue"); 1890 errval = -ENOMEM; 1891 goto error_unlocked; 1892 } 1893 1894 jdev_name = NULL; 1895 if (reiserfs_parse_options 1896 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name, 1897 &commit_max_age, qf_names, &qfmt) == 0) { 1898 goto error_unlocked; 1899 } 1900 if (jdev_name && jdev_name[0]) { 1901 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL); 1902 if (!sbi->s_jdev) { 1903 SWARN(silent, s, "", "Cannot allocate memory for " 1904 "journal device name"); 1905 goto error; 1906 } 1907 } 1908 #ifdef CONFIG_QUOTA 1909 handle_quota_files(s, qf_names, &qfmt); 1910 #endif 1911 1912 if (blocks) { 1913 SWARN(silent, s, "jmacd-7", "resize option for remount only"); 1914 goto error_unlocked; 1915 } 1916 1917 /* 1918 * try old format (undistributed bitmap, super block in 8-th 1k 1919 * block of a device) 1920 */ 1921 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES)) 1922 old_format = 1; 1923 1924 /* 1925 * try new format (64-th 1k block), which can contain reiserfs 1926 * super block 1927 */ 1928 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) { 1929 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s", 1930 s->s_id); 1931 goto error_unlocked; 1932 } 1933 1934 rs = SB_DISK_SUPER_BLOCK(s); 1935 /* 1936 * Let's do basic sanity check to verify that underlying device is not 1937 * smaller than the filesystem. If the check fails then abort and 1938 * scream, because bad stuff will happen otherwise. 1939 */ 1940 if (s->s_bdev && s->s_bdev->bd_inode 1941 && i_size_read(s->s_bdev->bd_inode) < 1942 sb_block_count(rs) * sb_blocksize(rs)) { 1943 SWARN(silent, s, "", "Filesystem cannot be " 1944 "mounted because it is bigger than the device"); 1945 SWARN(silent, s, "", "You may need to run fsck " 1946 "or increase size of your LVM partition"); 1947 SWARN(silent, s, "", "Or may be you forgot to " 1948 "reboot after fdisk when it told you to"); 1949 goto error_unlocked; 1950 } 1951 1952 sbi->s_mount_state = SB_REISERFS_STATE(s); 1953 sbi->s_mount_state = REISERFS_VALID_FS; 1954 1955 if ((errval = reiserfs_init_bitmap_cache(s))) { 1956 SWARN(silent, s, "jmacd-8", "unable to read bitmap"); 1957 goto error_unlocked; 1958 } 1959 1960 errval = -EINVAL; 1961 #ifdef CONFIG_REISERFS_CHECK 1962 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON"); 1963 SWARN(silent, s, "", "- it is slow mode for debugging."); 1964 #endif 1965 1966 /* make data=ordered the default */ 1967 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) && 1968 !reiserfs_data_writeback(s)) { 1969 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED); 1970 } 1971 1972 if (reiserfs_data_log(s)) { 1973 reiserfs_info(s, "using journaled data mode\n"); 1974 } else if (reiserfs_data_ordered(s)) { 1975 reiserfs_info(s, "using ordered data mode\n"); 1976 } else { 1977 reiserfs_info(s, "using writeback data mode\n"); 1978 } 1979 if (reiserfs_barrier_flush(s)) { 1980 printk("reiserfs: using flush barriers\n"); 1981 } 1982 1983 if (journal_init(s, jdev_name, old_format, commit_max_age)) { 1984 SWARN(silent, s, "sh-2022", 1985 "unable to initialize journal space"); 1986 goto error_unlocked; 1987 } else { 1988 /* 1989 * once this is set, journal_release must be called 1990 * if we error out of the mount 1991 */ 1992 jinit_done = 1; 1993 } 1994 1995 if (reread_meta_blocks(s)) { 1996 SWARN(silent, s, "jmacd-9", 1997 "unable to reread meta blocks after journal init"); 1998 goto error_unlocked; 1999 } 2000 2001 if (replay_only(s)) 2002 goto error_unlocked; 2003 2004 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) { 2005 SWARN(silent, s, "clm-7000", 2006 "Detected readonly device, marking FS readonly"); 2007 s->s_flags |= MS_RDONLY; 2008 } 2009 args.objectid = REISERFS_ROOT_OBJECTID; 2010 args.dirid = REISERFS_ROOT_PARENT_OBJECTID; 2011 root_inode = 2012 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor, 2013 reiserfs_init_locked_inode, (void *)&args); 2014 if (!root_inode) { 2015 SWARN(silent, s, "jmacd-10", "get root inode failed"); 2016 goto error_unlocked; 2017 } 2018 2019 /* 2020 * This path assumed to be called with the BKL in the old times. 2021 * Now we have inherited the big reiserfs lock from it and many 2022 * reiserfs helpers called in the mount path and elsewhere require 2023 * this lock to be held even if it's not always necessary. Let's be 2024 * conservative and hold it early. The window can be reduced after 2025 * careful review of the code. 2026 */ 2027 reiserfs_write_lock(s); 2028 2029 if (root_inode->i_state & I_NEW) { 2030 reiserfs_read_locked_inode(root_inode, &args); 2031 unlock_new_inode(root_inode); 2032 } 2033 2034 s->s_root = d_make_root(root_inode); 2035 if (!s->s_root) 2036 goto error; 2037 /* define and initialize hash function */ 2038 sbi->s_hash_function = hash_function(s); 2039 if (sbi->s_hash_function == NULL) { 2040 dput(s->s_root); 2041 s->s_root = NULL; 2042 goto error; 2043 } 2044 2045 if (is_reiserfs_3_5(rs) 2046 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1)) 2047 set_bit(REISERFS_3_5, &sbi->s_properties); 2048 else if (old_format) 2049 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties); 2050 else 2051 set_bit(REISERFS_3_6, &sbi->s_properties); 2052 2053 if (!(s->s_flags & MS_RDONLY)) { 2054 2055 errval = journal_begin(&th, s, 1); 2056 if (errval) { 2057 dput(s->s_root); 2058 s->s_root = NULL; 2059 goto error; 2060 } 2061 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 2062 2063 set_sb_umount_state(rs, REISERFS_ERROR_FS); 2064 set_sb_fs_state(rs, 0); 2065 2066 /* 2067 * Clear out s_bmap_nr if it would wrap. We can handle this 2068 * case, but older revisions can't. This will cause the 2069 * file system to fail mount on those older implementations, 2070 * avoiding corruption. -jeffm 2071 */ 2072 if (bmap_would_wrap(reiserfs_bmap_count(s)) && 2073 sb_bmap_nr(rs) != 0) { 2074 reiserfs_warning(s, "super-2030", "This file system " 2075 "claims to use %u bitmap blocks in " 2076 "its super block, but requires %u. " 2077 "Clearing to zero.", sb_bmap_nr(rs), 2078 reiserfs_bmap_count(s)); 2079 2080 set_sb_bmap_nr(rs, 0); 2081 } 2082 2083 if (old_format_only(s)) { 2084 /* 2085 * filesystem of format 3.5 either with standard 2086 * or non-standard journal 2087 */ 2088 if (convert_reiserfs(s)) { 2089 /* and -o conv is given */ 2090 if (!silent) 2091 reiserfs_info(s, 2092 "converting 3.5 filesystem to the 3.6 format"); 2093 2094 if (is_reiserfs_3_5(rs)) 2095 /* 2096 * put magic string of 3.6 format. 2097 * 2.2 will not be able to 2098 * mount this filesystem anymore 2099 */ 2100 memcpy(rs->s_v1.s_magic, 2101 reiserfs_3_6_magic_string, 2102 sizeof 2103 (reiserfs_3_6_magic_string)); 2104 2105 set_sb_version(rs, REISERFS_VERSION_2); 2106 reiserfs_convert_objectid_map_v1(s); 2107 set_bit(REISERFS_3_6, &sbi->s_properties); 2108 clear_bit(REISERFS_3_5, &sbi->s_properties); 2109 } else if (!silent) { 2110 reiserfs_info(s, "using 3.5.x disk format\n"); 2111 } 2112 } else 2113 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); 2114 2115 2116 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 2117 errval = journal_end(&th); 2118 if (errval) { 2119 dput(s->s_root); 2120 s->s_root = NULL; 2121 goto error; 2122 } 2123 2124 reiserfs_write_unlock(s); 2125 if ((errval = reiserfs_lookup_privroot(s)) || 2126 (errval = reiserfs_xattr_init(s, s->s_flags))) { 2127 dput(s->s_root); 2128 s->s_root = NULL; 2129 goto error_unlocked; 2130 } 2131 reiserfs_write_lock(s); 2132 2133 /* 2134 * look for files which were to be removed in previous session 2135 */ 2136 finish_unfinished(s); 2137 } else { 2138 if (old_format_only(s) && !silent) { 2139 reiserfs_info(s, "using 3.5.x disk format\n"); 2140 } 2141 2142 reiserfs_write_unlock(s); 2143 if ((errval = reiserfs_lookup_privroot(s)) || 2144 (errval = reiserfs_xattr_init(s, s->s_flags))) { 2145 dput(s->s_root); 2146 s->s_root = NULL; 2147 goto error_unlocked; 2148 } 2149 reiserfs_write_lock(s); 2150 } 2151 /* 2152 * mark hash in super block: it could be unset. overwrite should be ok 2153 */ 2154 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function)); 2155 2156 handle_attrs(s); 2157 2158 reiserfs_proc_info_init(s); 2159 2160 init_waitqueue_head(&(sbi->s_wait)); 2161 spin_lock_init(&sbi->bitmap_lock); 2162 2163 reiserfs_write_unlock(s); 2164 2165 return (0); 2166 2167 error: 2168 reiserfs_write_unlock(s); 2169 2170 error_unlocked: 2171 /* kill the commit thread, free journal ram */ 2172 if (jinit_done) { 2173 reiserfs_write_lock(s); 2174 journal_release_error(NULL, s); 2175 reiserfs_write_unlock(s); 2176 } 2177 2178 if (sbi->commit_wq) 2179 destroy_workqueue(sbi->commit_wq); 2180 2181 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work); 2182 2183 reiserfs_free_bitmap_cache(s); 2184 if (SB_BUFFER_WITH_SB(s)) 2185 brelse(SB_BUFFER_WITH_SB(s)); 2186 #ifdef CONFIG_QUOTA 2187 { 2188 int j; 2189 for (j = 0; j < REISERFS_MAXQUOTAS; j++) 2190 kfree(qf_names[j]); 2191 } 2192 #endif 2193 kfree(sbi); 2194 2195 s->s_fs_info = NULL; 2196 return errval; 2197 } 2198 2199 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2200 { 2201 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb); 2202 2203 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize)); 2204 buf->f_bfree = sb_free_blocks(rs); 2205 buf->f_bavail = buf->f_bfree; 2206 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1; 2207 buf->f_bsize = dentry->d_sb->s_blocksize; 2208 /* changed to accommodate gcc folks. */ 2209 buf->f_type = REISERFS_SUPER_MAGIC; 2210 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2); 2211 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2, 2212 sizeof(rs->s_uuid)/2); 2213 2214 return 0; 2215 } 2216 2217 #ifdef CONFIG_QUOTA 2218 static int reiserfs_write_dquot(struct dquot *dquot) 2219 { 2220 struct reiserfs_transaction_handle th; 2221 int ret, err; 2222 int depth; 2223 2224 reiserfs_write_lock(dquot->dq_sb); 2225 ret = 2226 journal_begin(&th, dquot->dq_sb, 2227 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 2228 if (ret) 2229 goto out; 2230 depth = reiserfs_write_unlock_nested(dquot->dq_sb); 2231 ret = dquot_commit(dquot); 2232 reiserfs_write_lock_nested(dquot->dq_sb, depth); 2233 err = journal_end(&th); 2234 if (!ret && err) 2235 ret = err; 2236 out: 2237 reiserfs_write_unlock(dquot->dq_sb); 2238 return ret; 2239 } 2240 2241 static int reiserfs_acquire_dquot(struct dquot *dquot) 2242 { 2243 struct reiserfs_transaction_handle th; 2244 int ret, err; 2245 int depth; 2246 2247 reiserfs_write_lock(dquot->dq_sb); 2248 ret = 2249 journal_begin(&th, dquot->dq_sb, 2250 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 2251 if (ret) 2252 goto out; 2253 depth = reiserfs_write_unlock_nested(dquot->dq_sb); 2254 ret = dquot_acquire(dquot); 2255 reiserfs_write_lock_nested(dquot->dq_sb, depth); 2256 err = journal_end(&th); 2257 if (!ret && err) 2258 ret = err; 2259 out: 2260 reiserfs_write_unlock(dquot->dq_sb); 2261 return ret; 2262 } 2263 2264 static int reiserfs_release_dquot(struct dquot *dquot) 2265 { 2266 struct reiserfs_transaction_handle th; 2267 int ret, err; 2268 2269 reiserfs_write_lock(dquot->dq_sb); 2270 ret = 2271 journal_begin(&th, dquot->dq_sb, 2272 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 2273 reiserfs_write_unlock(dquot->dq_sb); 2274 if (ret) { 2275 /* Release dquot anyway to avoid endless cycle in dqput() */ 2276 dquot_release(dquot); 2277 goto out; 2278 } 2279 ret = dquot_release(dquot); 2280 reiserfs_write_lock(dquot->dq_sb); 2281 err = journal_end(&th); 2282 if (!ret && err) 2283 ret = err; 2284 reiserfs_write_unlock(dquot->dq_sb); 2285 out: 2286 return ret; 2287 } 2288 2289 static int reiserfs_mark_dquot_dirty(struct dquot *dquot) 2290 { 2291 /* Are we journaling quotas? */ 2292 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 2293 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 2294 dquot_mark_dquot_dirty(dquot); 2295 return reiserfs_write_dquot(dquot); 2296 } else 2297 return dquot_mark_dquot_dirty(dquot); 2298 } 2299 2300 static int reiserfs_write_info(struct super_block *sb, int type) 2301 { 2302 struct reiserfs_transaction_handle th; 2303 int ret, err; 2304 int depth; 2305 2306 /* Data block + inode block */ 2307 reiserfs_write_lock(sb); 2308 ret = journal_begin(&th, sb, 2); 2309 if (ret) 2310 goto out; 2311 depth = reiserfs_write_unlock_nested(sb); 2312 ret = dquot_commit_info(sb, type); 2313 reiserfs_write_lock_nested(sb, depth); 2314 err = journal_end(&th); 2315 if (!ret && err) 2316 ret = err; 2317 out: 2318 reiserfs_write_unlock(sb); 2319 return ret; 2320 } 2321 2322 /* 2323 * Turn on quotas during mount time - we need to find the quota file and such... 2324 */ 2325 static int reiserfs_quota_on_mount(struct super_block *sb, int type) 2326 { 2327 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type], 2328 REISERFS_SB(sb)->s_jquota_fmt, type); 2329 } 2330 2331 /* 2332 * Standard function to be called on quota_on 2333 */ 2334 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id, 2335 struct path *path) 2336 { 2337 int err; 2338 struct inode *inode; 2339 struct reiserfs_transaction_handle th; 2340 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA; 2341 2342 reiserfs_write_lock(sb); 2343 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) { 2344 err = -EINVAL; 2345 goto out; 2346 } 2347 2348 /* Quotafile not on the same filesystem? */ 2349 if (path->dentry->d_sb != sb) { 2350 err = -EXDEV; 2351 goto out; 2352 } 2353 inode = d_inode(path->dentry); 2354 /* 2355 * We must not pack tails for quota files on reiserfs for quota 2356 * IO to work 2357 */ 2358 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) { 2359 err = reiserfs_unpack(inode, NULL); 2360 if (err) { 2361 reiserfs_warning(sb, "super-6520", 2362 "Unpacking tail of quota file failed" 2363 " (%d). Cannot turn on quotas.", err); 2364 err = -EINVAL; 2365 goto out; 2366 } 2367 mark_inode_dirty(inode); 2368 } 2369 /* Journaling quota? */ 2370 if (REISERFS_SB(sb)->s_qf_names[type]) { 2371 /* Quotafile not of fs root? */ 2372 if (path->dentry->d_parent != sb->s_root) 2373 reiserfs_warning(sb, "super-6521", 2374 "Quota file not on filesystem root. " 2375 "Journalled quota will not work."); 2376 } 2377 2378 /* 2379 * When we journal data on quota file, we have to flush journal to see 2380 * all updates to the file when we bypass pagecache... 2381 */ 2382 if (reiserfs_file_data_log(inode)) { 2383 /* Just start temporary transaction and finish it */ 2384 err = journal_begin(&th, sb, 1); 2385 if (err) 2386 goto out; 2387 err = journal_end_sync(&th); 2388 if (err) 2389 goto out; 2390 } 2391 reiserfs_write_unlock(sb); 2392 return dquot_quota_on(sb, type, format_id, path); 2393 out: 2394 reiserfs_write_unlock(sb); 2395 return err; 2396 } 2397 2398 /* 2399 * Read data from quotafile - avoid pagecache and such because we cannot afford 2400 * acquiring the locks... As quota files are never truncated and quota code 2401 * itself serializes the operations (and no one else should touch the files) 2402 * we don't have to be afraid of races 2403 */ 2404 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data, 2405 size_t len, loff_t off) 2406 { 2407 struct inode *inode = sb_dqopt(sb)->files[type]; 2408 unsigned long blk = off >> sb->s_blocksize_bits; 2409 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; 2410 size_t toread; 2411 struct buffer_head tmp_bh, *bh; 2412 loff_t i_size = i_size_read(inode); 2413 2414 if (off > i_size) 2415 return 0; 2416 if (off + len > i_size) 2417 len = i_size - off; 2418 toread = len; 2419 while (toread > 0) { 2420 tocopy = 2421 sb->s_blocksize - offset < 2422 toread ? sb->s_blocksize - offset : toread; 2423 tmp_bh.b_state = 0; 2424 /* 2425 * Quota files are without tails so we can safely 2426 * use this function 2427 */ 2428 reiserfs_write_lock(sb); 2429 err = reiserfs_get_block(inode, blk, &tmp_bh, 0); 2430 reiserfs_write_unlock(sb); 2431 if (err) 2432 return err; 2433 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 2434 memset(data, 0, tocopy); 2435 else { 2436 bh = sb_bread(sb, tmp_bh.b_blocknr); 2437 if (!bh) 2438 return -EIO; 2439 memcpy(data, bh->b_data + offset, tocopy); 2440 brelse(bh); 2441 } 2442 offset = 0; 2443 toread -= tocopy; 2444 data += tocopy; 2445 blk++; 2446 } 2447 return len; 2448 } 2449 2450 /* 2451 * Write to quotafile (we know the transaction is already started and has 2452 * enough credits) 2453 */ 2454 static ssize_t reiserfs_quota_write(struct super_block *sb, int type, 2455 const char *data, size_t len, loff_t off) 2456 { 2457 struct inode *inode = sb_dqopt(sb)->files[type]; 2458 unsigned long blk = off >> sb->s_blocksize_bits; 2459 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; 2460 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL; 2461 size_t towrite = len; 2462 struct buffer_head tmp_bh, *bh; 2463 2464 if (!current->journal_info) { 2465 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n", 2466 (unsigned long long)off, (unsigned long long)len); 2467 return -EIO; 2468 } 2469 while (towrite > 0) { 2470 tocopy = sb->s_blocksize - offset < towrite ? 2471 sb->s_blocksize - offset : towrite; 2472 tmp_bh.b_state = 0; 2473 reiserfs_write_lock(sb); 2474 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE); 2475 reiserfs_write_unlock(sb); 2476 if (err) 2477 goto out; 2478 if (offset || tocopy != sb->s_blocksize) 2479 bh = sb_bread(sb, tmp_bh.b_blocknr); 2480 else 2481 bh = sb_getblk(sb, tmp_bh.b_blocknr); 2482 if (!bh) { 2483 err = -EIO; 2484 goto out; 2485 } 2486 lock_buffer(bh); 2487 memcpy(bh->b_data + offset, data, tocopy); 2488 flush_dcache_page(bh->b_page); 2489 set_buffer_uptodate(bh); 2490 unlock_buffer(bh); 2491 reiserfs_write_lock(sb); 2492 reiserfs_prepare_for_journal(sb, bh, 1); 2493 journal_mark_dirty(current->journal_info, bh); 2494 if (!journal_quota) 2495 reiserfs_add_ordered_list(inode, bh); 2496 reiserfs_write_unlock(sb); 2497 brelse(bh); 2498 offset = 0; 2499 towrite -= tocopy; 2500 data += tocopy; 2501 blk++; 2502 } 2503 out: 2504 if (len == towrite) 2505 return err; 2506 if (inode->i_size < off + len - towrite) 2507 i_size_write(inode, off + len - towrite); 2508 inode->i_version++; 2509 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2510 mark_inode_dirty(inode); 2511 return len - towrite; 2512 } 2513 2514 #endif 2515 2516 static struct dentry *get_super_block(struct file_system_type *fs_type, 2517 int flags, const char *dev_name, 2518 void *data) 2519 { 2520 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super); 2521 } 2522 2523 static int __init init_reiserfs_fs(void) 2524 { 2525 int ret; 2526 2527 ret = init_inodecache(); 2528 if (ret) 2529 return ret; 2530 2531 reiserfs_proc_info_global_init(); 2532 2533 ret = register_filesystem(&reiserfs_fs_type); 2534 if (ret) 2535 goto out; 2536 2537 return 0; 2538 out: 2539 reiserfs_proc_info_global_done(); 2540 destroy_inodecache(); 2541 2542 return ret; 2543 } 2544 2545 static void __exit exit_reiserfs_fs(void) 2546 { 2547 reiserfs_proc_info_global_done(); 2548 unregister_filesystem(&reiserfs_fs_type); 2549 destroy_inodecache(); 2550 } 2551 2552 struct file_system_type reiserfs_fs_type = { 2553 .owner = THIS_MODULE, 2554 .name = "reiserfs", 2555 .mount = get_super_block, 2556 .kill_sb = reiserfs_kill_sb, 2557 .fs_flags = FS_REQUIRES_DEV, 2558 }; 2559 MODULE_ALIAS_FS("reiserfs"); 2560 2561 MODULE_DESCRIPTION("ReiserFS journaled filesystem"); 2562 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>"); 2563 MODULE_LICENSE("GPL"); 2564 2565 module_init(init_reiserfs_fs); 2566 module_exit(exit_reiserfs_fs); 2567