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