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 (!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 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_show_option(seq, "jdev", 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_show_option(seq, "usrjquota", 725 REISERFS_SB(s)->s_qf_names[USRQUOTA]); 726 else if (opts & (1 << REISERFS_USRQUOTA)) 727 seq_puts(seq, ",usrquota"); 728 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA]) 729 seq_show_option(seq, "grpjquota", 730 REISERFS_SB(s)->s_qf_names[GRPQUOTA]); 731 else if (opts & (1 << REISERFS_GRPQUOTA)) 732 seq_puts(seq, ",grpquota"); 733 if (REISERFS_SB(s)->s_jquota_fmt) { 734 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD) 735 seq_puts(seq, ",jqfmt=vfsold"); 736 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0) 737 seq_puts(seq, ",jqfmt=vfsv0"); 738 } 739 #endif 740 741 /* Block allocator options */ 742 if (opts & (1 << REISERFS_NO_BORDER)) 743 seq_puts(seq, ",block-allocator=noborder"); 744 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION)) 745 seq_puts(seq, ",block-allocator=no_unhashed_relocation"); 746 if (opts & (1 << REISERFS_HASHED_RELOCATION)) 747 seq_puts(seq, ",block-allocator=hashed_relocation"); 748 if (opts & (1 << REISERFS_TEST4)) 749 seq_puts(seq, ",block-allocator=test4"); 750 show_alloc_options(seq, s); 751 return 0; 752 } 753 754 #ifdef CONFIG_QUOTA 755 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *, 756 size_t, loff_t); 757 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t, 758 loff_t); 759 760 static struct dquot **reiserfs_get_dquots(struct inode *inode) 761 { 762 return REISERFS_I(inode)->i_dquot; 763 } 764 #endif 765 766 static const struct super_operations reiserfs_sops = { 767 .alloc_inode = reiserfs_alloc_inode, 768 .destroy_inode = reiserfs_destroy_inode, 769 .write_inode = reiserfs_write_inode, 770 .dirty_inode = reiserfs_dirty_inode, 771 .evict_inode = reiserfs_evict_inode, 772 .put_super = reiserfs_put_super, 773 .sync_fs = reiserfs_sync_fs, 774 .freeze_fs = reiserfs_freeze, 775 .unfreeze_fs = reiserfs_unfreeze, 776 .statfs = reiserfs_statfs, 777 .remount_fs = reiserfs_remount, 778 .show_options = reiserfs_show_options, 779 #ifdef CONFIG_QUOTA 780 .quota_read = reiserfs_quota_read, 781 .quota_write = reiserfs_quota_write, 782 .get_dquots = reiserfs_get_dquots, 783 #endif 784 }; 785 786 #ifdef CONFIG_QUOTA 787 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 788 789 static int reiserfs_write_dquot(struct dquot *); 790 static int reiserfs_acquire_dquot(struct dquot *); 791 static int reiserfs_release_dquot(struct dquot *); 792 static int reiserfs_mark_dquot_dirty(struct dquot *); 793 static int reiserfs_write_info(struct super_block *, int); 794 static int reiserfs_quota_on(struct super_block *, int, int, struct path *); 795 796 static const struct dquot_operations reiserfs_quota_operations = { 797 .write_dquot = reiserfs_write_dquot, 798 .acquire_dquot = reiserfs_acquire_dquot, 799 .release_dquot = reiserfs_release_dquot, 800 .mark_dirty = reiserfs_mark_dquot_dirty, 801 .write_info = reiserfs_write_info, 802 .alloc_dquot = dquot_alloc, 803 .destroy_dquot = dquot_destroy, 804 }; 805 806 static const struct quotactl_ops reiserfs_qctl_operations = { 807 .quota_on = reiserfs_quota_on, 808 .quota_off = dquot_quota_off, 809 .quota_sync = dquot_quota_sync, 810 .get_state = dquot_get_state, 811 .set_info = dquot_set_dqinfo, 812 .get_dqblk = dquot_get_dqblk, 813 .set_dqblk = dquot_set_dqblk, 814 }; 815 #endif 816 817 static const struct export_operations reiserfs_export_ops = { 818 .encode_fh = reiserfs_encode_fh, 819 .fh_to_dentry = reiserfs_fh_to_dentry, 820 .fh_to_parent = reiserfs_fh_to_parent, 821 .get_parent = reiserfs_get_parent, 822 }; 823 824 /* 825 * this struct is used in reiserfs_getopt () for containing the value for 826 * those mount options that have values rather than being toggles. 827 */ 828 typedef struct { 829 char *value; 830 /* 831 * bitmask which is to set on mount_options bitmask 832 * when this value is found, 0 is no bits are to be changed. 833 */ 834 int setmask; 835 /* 836 * bitmask which is to clear on mount_options bitmask 837 * when this value is found, 0 is no bits are to be changed. 838 * This is applied BEFORE setmask 839 */ 840 int clrmask; 841 } arg_desc_t; 842 843 /* Set this bit in arg_required to allow empty arguments */ 844 #define REISERFS_OPT_ALLOWEMPTY 31 845 846 /* 847 * this struct is used in reiserfs_getopt() for describing the 848 * set of reiserfs mount options 849 */ 850 typedef struct { 851 char *option_name; 852 853 /* 0 if argument is not required, not 0 otherwise */ 854 int arg_required; 855 856 /* list of values accepted by an option */ 857 const arg_desc_t *values; 858 859 /* 860 * bitmask which is to set on mount_options bitmask 861 * when this value is found, 0 is no bits are to be changed. 862 */ 863 int setmask; 864 865 /* 866 * bitmask which is to clear on mount_options bitmask 867 * when this value is found, 0 is no bits are to be changed. 868 * This is applied BEFORE setmask 869 */ 870 int clrmask; 871 } opt_desc_t; 872 873 /* possible values for -o data= */ 874 static const arg_desc_t logging_mode[] = { 875 {"ordered", 1 << REISERFS_DATA_ORDERED, 876 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)}, 877 {"journal", 1 << REISERFS_DATA_LOG, 878 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)}, 879 {"writeback", 1 << REISERFS_DATA_WRITEBACK, 880 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)}, 881 {.value = NULL} 882 }; 883 884 /* possible values for -o barrier= */ 885 static const arg_desc_t barrier_mode[] = { 886 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH}, 887 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE}, 888 {.value = NULL} 889 }; 890 891 /* 892 * possible values for "-o block-allocator=" and bits which are to be set in 893 * s_mount_opt of reiserfs specific part of in-core super block 894 */ 895 static const arg_desc_t balloc[] = { 896 {"noborder", 1 << REISERFS_NO_BORDER, 0}, 897 {"border", 0, 1 << REISERFS_NO_BORDER}, 898 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0}, 899 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0}, 900 {"test4", 1 << REISERFS_TEST4, 0}, 901 {"notest4", 0, 1 << REISERFS_TEST4}, 902 {NULL, 0, 0} 903 }; 904 905 static const arg_desc_t tails[] = { 906 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL}, 907 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, 908 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL}, 909 {NULL, 0, 0} 910 }; 911 912 static const arg_desc_t error_actions[] = { 913 {"panic", 1 << REISERFS_ERROR_PANIC, 914 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)}, 915 {"ro-remount", 1 << REISERFS_ERROR_RO, 916 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)}, 917 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG 918 {"continue", 1 << REISERFS_ERROR_CONTINUE, 919 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)}, 920 #endif 921 {NULL, 0, 0}, 922 }; 923 924 /* 925 * proceed only one option from a list *cur - string containing of mount 926 * options 927 * opts - array of options which are accepted 928 * opt_arg - if option is found and requires an argument and if it is specifed 929 * in the input - pointer to the argument is stored here 930 * bit_flags - if option requires to set a certain bit - it is set here 931 * return -1 if unknown option is found, opt->arg_required otherwise 932 */ 933 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts, 934 char **opt_arg, unsigned long *bit_flags) 935 { 936 char *p; 937 /* 938 * foo=bar, 939 * ^ ^ ^ 940 * | | +-- option_end 941 * | +-- arg_start 942 * +-- option_start 943 */ 944 const opt_desc_t *opt; 945 const arg_desc_t *arg; 946 947 p = *cur; 948 949 /* assume argument cannot contain commas */ 950 *cur = strchr(p, ','); 951 if (*cur) { 952 *(*cur) = '\0'; 953 (*cur)++; 954 } 955 956 if (!strncmp(p, "alloc=", 6)) { 957 /* 958 * Ugly special case, probably we should redo options 959 * parser so that it can understand several arguments for 960 * some options, also so that it can fill several bitfields 961 * with option values. 962 */ 963 if (reiserfs_parse_alloc_options(s, p + 6)) { 964 return -1; 965 } else { 966 return 0; 967 } 968 } 969 970 /* for every option in the list */ 971 for (opt = opts; opt->option_name; opt++) { 972 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) { 973 if (bit_flags) { 974 if (opt->clrmask == 975 (1 << REISERFS_UNSUPPORTED_OPT)) 976 reiserfs_warning(s, "super-6500", 977 "%s not supported.\n", 978 p); 979 else 980 *bit_flags &= ~opt->clrmask; 981 if (opt->setmask == 982 (1 << REISERFS_UNSUPPORTED_OPT)) 983 reiserfs_warning(s, "super-6501", 984 "%s not supported.\n", 985 p); 986 else 987 *bit_flags |= opt->setmask; 988 } 989 break; 990 } 991 } 992 if (!opt->option_name) { 993 reiserfs_warning(s, "super-6502", 994 "unknown mount option \"%s\"", p); 995 return -1; 996 } 997 998 p += strlen(opt->option_name); 999 switch (*p) { 1000 case '=': 1001 if (!opt->arg_required) { 1002 reiserfs_warning(s, "super-6503", 1003 "the option \"%s\" does not " 1004 "require an argument\n", 1005 opt->option_name); 1006 return -1; 1007 } 1008 break; 1009 1010 case 0: 1011 if (opt->arg_required) { 1012 reiserfs_warning(s, "super-6504", 1013 "the option \"%s\" requires an " 1014 "argument\n", opt->option_name); 1015 return -1; 1016 } 1017 break; 1018 default: 1019 reiserfs_warning(s, "super-6505", 1020 "head of option \"%s\" is only correct\n", 1021 opt->option_name); 1022 return -1; 1023 } 1024 1025 /* 1026 * move to the argument, or to next option if argument is not 1027 * required 1028 */ 1029 p++; 1030 1031 if (opt->arg_required 1032 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY)) 1033 && !strlen(p)) { 1034 /* this catches "option=," if not allowed */ 1035 reiserfs_warning(s, "super-6506", 1036 "empty argument for \"%s\"\n", 1037 opt->option_name); 1038 return -1; 1039 } 1040 1041 if (!opt->values) { 1042 /* *=NULLopt_arg contains pointer to argument */ 1043 *opt_arg = p; 1044 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY); 1045 } 1046 1047 /* values possible for this option are listed in opt->values */ 1048 for (arg = opt->values; arg->value; arg++) { 1049 if (!strcmp(p, arg->value)) { 1050 if (bit_flags) { 1051 *bit_flags &= ~arg->clrmask; 1052 *bit_flags |= arg->setmask; 1053 } 1054 return opt->arg_required; 1055 } 1056 } 1057 1058 reiserfs_warning(s, "super-6506", 1059 "bad value \"%s\" for option \"%s\"\n", p, 1060 opt->option_name); 1061 return -1; 1062 } 1063 1064 /* returns 0 if something is wrong in option string, 1 - otherwise */ 1065 static int reiserfs_parse_options(struct super_block *s, 1066 1067 /* string given via mount's -o */ 1068 char *options, 1069 1070 /* 1071 * after the parsing phase, contains the 1072 * collection of bitflags defining what 1073 * mount options were selected. 1074 */ 1075 unsigned long *mount_options, 1076 1077 /* strtol-ed from NNN of resize=NNN */ 1078 unsigned long *blocks, 1079 char **jdev_name, 1080 unsigned int *commit_max_age, 1081 char **qf_names, 1082 unsigned int *qfmt) 1083 { 1084 int c; 1085 char *arg = NULL; 1086 char *pos; 1087 opt_desc_t opts[] = { 1088 /* 1089 * Compatibility stuff, so that -o notail for old 1090 * setups still work 1091 */ 1092 {"tails",.arg_required = 't',.values = tails}, 1093 {"notail",.clrmask = 1094 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, 1095 {"conv",.setmask = 1 << REISERFS_CONVERT}, 1096 {"attrs",.setmask = 1 << REISERFS_ATTRS}, 1097 {"noattrs",.clrmask = 1 << REISERFS_ATTRS}, 1098 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT}, 1099 #ifdef CONFIG_REISERFS_FS_XATTR 1100 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER}, 1101 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER}, 1102 #else 1103 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1104 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1105 #endif 1106 #ifdef CONFIG_REISERFS_FS_POSIX_ACL 1107 {"acl",.setmask = 1 << REISERFS_POSIXACL}, 1108 {"noacl",.clrmask = 1 << REISERFS_POSIXACL}, 1109 #else 1110 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1111 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, 1112 #endif 1113 {.option_name = "nolog"}, 1114 {"replayonly",.setmask = 1 << REPLAYONLY}, 1115 {"block-allocator",.arg_required = 'a',.values = balloc}, 1116 {"data",.arg_required = 'd',.values = logging_mode}, 1117 {"barrier",.arg_required = 'b',.values = barrier_mode}, 1118 {"resize",.arg_required = 'r',.values = NULL}, 1119 {"jdev",.arg_required = 'j',.values = NULL}, 1120 {"nolargeio",.arg_required = 'w',.values = NULL}, 1121 {"commit",.arg_required = 'c',.values = NULL}, 1122 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA}, 1123 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA}, 1124 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA}, 1125 {"errors",.arg_required = 'e',.values = error_actions}, 1126 {"usrjquota",.arg_required = 1127 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, 1128 {"grpjquota",.arg_required = 1129 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, 1130 {"jqfmt",.arg_required = 'f',.values = NULL}, 1131 {.option_name = NULL} 1132 }; 1133 1134 *blocks = 0; 1135 if (!options || !*options) 1136 /* 1137 * use default configuration: create tails, journaling on, no 1138 * conversion to newest format 1139 */ 1140 return 1; 1141 1142 for (pos = options; pos;) { 1143 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options); 1144 if (c == -1) 1145 /* wrong option is given */ 1146 return 0; 1147 1148 if (c == 'r') { 1149 char *p; 1150 1151 p = NULL; 1152 /* "resize=NNN" or "resize=auto" */ 1153 1154 if (!strcmp(arg, "auto")) { 1155 /* From JFS code, to auto-get the size. */ 1156 *blocks = 1157 s->s_bdev->bd_inode->i_size >> s-> 1158 s_blocksize_bits; 1159 } else { 1160 *blocks = simple_strtoul(arg, &p, 0); 1161 if (*p != '\0') { 1162 /* NNN does not look like a number */ 1163 reiserfs_warning(s, "super-6507", 1164 "bad value %s for " 1165 "-oresize\n", arg); 1166 return 0; 1167 } 1168 } 1169 } 1170 1171 if (c == 'c') { 1172 char *p = NULL; 1173 unsigned long val = simple_strtoul(arg, &p, 0); 1174 /* commit=NNN (time in seconds) */ 1175 if (*p != '\0' || val >= (unsigned int)-1) { 1176 reiserfs_warning(s, "super-6508", 1177 "bad value %s for -ocommit\n", 1178 arg); 1179 return 0; 1180 } 1181 *commit_max_age = (unsigned int)val; 1182 } 1183 1184 if (c == 'w') { 1185 reiserfs_warning(s, "super-6509", "nolargeio option " 1186 "is no longer supported"); 1187 return 0; 1188 } 1189 1190 if (c == 'j') { 1191 if (arg && *arg && jdev_name) { 1192 /* Hm, already assigned? */ 1193 if (*jdev_name) { 1194 reiserfs_warning(s, "super-6510", 1195 "journal device was " 1196 "already specified to " 1197 "be %s", *jdev_name); 1198 return 0; 1199 } 1200 *jdev_name = arg; 1201 } 1202 } 1203 #ifdef CONFIG_QUOTA 1204 if (c == 'u' || c == 'g') { 1205 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA; 1206 1207 if (sb_any_quota_loaded(s) && 1208 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) { 1209 reiserfs_warning(s, "super-6511", 1210 "cannot change journaled " 1211 "quota options when quota " 1212 "turned on."); 1213 return 0; 1214 } 1215 if (*arg) { /* Some filename specified? */ 1216 if (REISERFS_SB(s)->s_qf_names[qtype] 1217 && strcmp(REISERFS_SB(s)->s_qf_names[qtype], 1218 arg)) { 1219 reiserfs_warning(s, "super-6512", 1220 "%s quota file " 1221 "already specified.", 1222 QTYPE2NAME(qtype)); 1223 return 0; 1224 } 1225 if (strchr(arg, '/')) { 1226 reiserfs_warning(s, "super-6513", 1227 "quotafile must be " 1228 "on filesystem root."); 1229 return 0; 1230 } 1231 qf_names[qtype] = kstrdup(arg, GFP_KERNEL); 1232 if (!qf_names[qtype]) { 1233 reiserfs_warning(s, "reiserfs-2502", 1234 "not enough memory " 1235 "for storing " 1236 "quotafile name."); 1237 return 0; 1238 } 1239 if (qtype == USRQUOTA) 1240 *mount_options |= 1 << REISERFS_USRQUOTA; 1241 else 1242 *mount_options |= 1 << REISERFS_GRPQUOTA; 1243 } else { 1244 if (qf_names[qtype] != 1245 REISERFS_SB(s)->s_qf_names[qtype]) 1246 kfree(qf_names[qtype]); 1247 qf_names[qtype] = NULL; 1248 if (qtype == USRQUOTA) 1249 *mount_options &= ~(1 << REISERFS_USRQUOTA); 1250 else 1251 *mount_options &= ~(1 << REISERFS_GRPQUOTA); 1252 } 1253 } 1254 if (c == 'f') { 1255 if (!strcmp(arg, "vfsold")) 1256 *qfmt = QFMT_VFS_OLD; 1257 else if (!strcmp(arg, "vfsv0")) 1258 *qfmt = QFMT_VFS_V0; 1259 else { 1260 reiserfs_warning(s, "super-6514", 1261 "unknown quota format " 1262 "specified."); 1263 return 0; 1264 } 1265 if (sb_any_quota_loaded(s) && 1266 *qfmt != REISERFS_SB(s)->s_jquota_fmt) { 1267 reiserfs_warning(s, "super-6515", 1268 "cannot change journaled " 1269 "quota options when quota " 1270 "turned on."); 1271 return 0; 1272 } 1273 } 1274 #else 1275 if (c == 'u' || c == 'g' || c == 'f') { 1276 reiserfs_warning(s, "reiserfs-2503", "journaled " 1277 "quota options not supported."); 1278 return 0; 1279 } 1280 #endif 1281 } 1282 1283 #ifdef CONFIG_QUOTA 1284 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt 1285 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) { 1286 reiserfs_warning(s, "super-6515", 1287 "journaled quota format not specified."); 1288 return 0; 1289 } 1290 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) && 1291 sb_has_quota_loaded(s, USRQUOTA)) || 1292 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) && 1293 sb_has_quota_loaded(s, GRPQUOTA))) { 1294 reiserfs_warning(s, "super-6516", "quota options must " 1295 "be present when quota is turned on."); 1296 return 0; 1297 } 1298 #endif 1299 1300 return 1; 1301 } 1302 1303 static void switch_data_mode(struct super_block *s, unsigned long mode) 1304 { 1305 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) | 1306 (1 << REISERFS_DATA_ORDERED) | 1307 (1 << REISERFS_DATA_WRITEBACK)); 1308 REISERFS_SB(s)->s_mount_opt |= (1 << mode); 1309 } 1310 1311 static void handle_data_mode(struct super_block *s, unsigned long mount_options) 1312 { 1313 if (mount_options & (1 << REISERFS_DATA_LOG)) { 1314 if (!reiserfs_data_log(s)) { 1315 switch_data_mode(s, REISERFS_DATA_LOG); 1316 reiserfs_info(s, "switching to journaled data mode\n"); 1317 } 1318 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) { 1319 if (!reiserfs_data_ordered(s)) { 1320 switch_data_mode(s, REISERFS_DATA_ORDERED); 1321 reiserfs_info(s, "switching to ordered data mode\n"); 1322 } 1323 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) { 1324 if (!reiserfs_data_writeback(s)) { 1325 switch_data_mode(s, REISERFS_DATA_WRITEBACK); 1326 reiserfs_info(s, "switching to writeback data mode\n"); 1327 } 1328 } 1329 } 1330 1331 static void handle_barrier_mode(struct super_block *s, unsigned long bits) 1332 { 1333 int flush = (1 << REISERFS_BARRIER_FLUSH); 1334 int none = (1 << REISERFS_BARRIER_NONE); 1335 int all_barrier = flush | none; 1336 1337 if (bits & all_barrier) { 1338 REISERFS_SB(s)->s_mount_opt &= ~all_barrier; 1339 if (bits & flush) { 1340 REISERFS_SB(s)->s_mount_opt |= flush; 1341 printk("reiserfs: enabling write barrier flush mode\n"); 1342 } else if (bits & none) { 1343 REISERFS_SB(s)->s_mount_opt |= none; 1344 printk("reiserfs: write barriers turned off\n"); 1345 } 1346 } 1347 } 1348 1349 static void handle_attrs(struct super_block *s) 1350 { 1351 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s); 1352 1353 if (reiserfs_attrs(s)) { 1354 if (old_format_only(s)) { 1355 reiserfs_warning(s, "super-6517", "cannot support " 1356 "attributes on 3.5.x disk format"); 1357 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); 1358 return; 1359 } 1360 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) { 1361 reiserfs_warning(s, "super-6518", "cannot support " 1362 "attributes until flag is set in " 1363 "super-block"); 1364 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); 1365 } 1366 } 1367 } 1368 1369 #ifdef CONFIG_QUOTA 1370 static void handle_quota_files(struct super_block *s, char **qf_names, 1371 unsigned int *qfmt) 1372 { 1373 int i; 1374 1375 for (i = 0; i < REISERFS_MAXQUOTAS; i++) { 1376 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) 1377 kfree(REISERFS_SB(s)->s_qf_names[i]); 1378 REISERFS_SB(s)->s_qf_names[i] = qf_names[i]; 1379 } 1380 if (*qfmt) 1381 REISERFS_SB(s)->s_jquota_fmt = *qfmt; 1382 } 1383 #endif 1384 1385 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg) 1386 { 1387 struct reiserfs_super_block *rs; 1388 struct reiserfs_transaction_handle th; 1389 unsigned long blocks; 1390 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt; 1391 unsigned long safe_mask = 0; 1392 unsigned int commit_max_age = (unsigned int)-1; 1393 struct reiserfs_journal *journal = SB_JOURNAL(s); 1394 char *new_opts = kstrdup(arg, GFP_KERNEL); 1395 int err; 1396 char *qf_names[REISERFS_MAXQUOTAS]; 1397 unsigned int qfmt = 0; 1398 #ifdef CONFIG_QUOTA 1399 int i; 1400 #endif 1401 1402 sync_filesystem(s); 1403 reiserfs_write_lock(s); 1404 1405 #ifdef CONFIG_QUOTA 1406 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names)); 1407 #endif 1408 1409 rs = SB_DISK_SUPER_BLOCK(s); 1410 1411 if (!reiserfs_parse_options 1412 (s, arg, &mount_options, &blocks, NULL, &commit_max_age, 1413 qf_names, &qfmt)) { 1414 #ifdef CONFIG_QUOTA 1415 for (i = 0; i < REISERFS_MAXQUOTAS; i++) 1416 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) 1417 kfree(qf_names[i]); 1418 #endif 1419 err = -EINVAL; 1420 goto out_err_unlock; 1421 } 1422 #ifdef CONFIG_QUOTA 1423 handle_quota_files(s, qf_names, &qfmt); 1424 #endif 1425 1426 handle_attrs(s); 1427 1428 /* Add options that are safe here */ 1429 safe_mask |= 1 << REISERFS_SMALLTAIL; 1430 safe_mask |= 1 << REISERFS_LARGETAIL; 1431 safe_mask |= 1 << REISERFS_NO_BORDER; 1432 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION; 1433 safe_mask |= 1 << REISERFS_HASHED_RELOCATION; 1434 safe_mask |= 1 << REISERFS_TEST4; 1435 safe_mask |= 1 << REISERFS_ATTRS; 1436 safe_mask |= 1 << REISERFS_XATTRS_USER; 1437 safe_mask |= 1 << REISERFS_POSIXACL; 1438 safe_mask |= 1 << REISERFS_BARRIER_FLUSH; 1439 safe_mask |= 1 << REISERFS_BARRIER_NONE; 1440 safe_mask |= 1 << REISERFS_ERROR_RO; 1441 safe_mask |= 1 << REISERFS_ERROR_CONTINUE; 1442 safe_mask |= 1 << REISERFS_ERROR_PANIC; 1443 safe_mask |= 1 << REISERFS_USRQUOTA; 1444 safe_mask |= 1 << REISERFS_GRPQUOTA; 1445 1446 /* 1447 * Update the bitmask, taking care to keep 1448 * the bits we're not allowed to change here 1449 */ 1450 REISERFS_SB(s)->s_mount_opt = 1451 (REISERFS_SB(s)-> 1452 s_mount_opt & ~safe_mask) | (mount_options & safe_mask); 1453 1454 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) { 1455 journal->j_max_commit_age = commit_max_age; 1456 journal->j_max_trans_age = commit_max_age; 1457 } else if (commit_max_age == 0) { 1458 /* 0 means restore defaults. */ 1459 journal->j_max_commit_age = journal->j_default_max_commit_age; 1460 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; 1461 } 1462 1463 if (blocks) { 1464 err = reiserfs_resize(s, blocks); 1465 if (err != 0) 1466 goto out_err_unlock; 1467 } 1468 1469 if (*mount_flags & MS_RDONLY) { 1470 reiserfs_write_unlock(s); 1471 reiserfs_xattr_init(s, *mount_flags); 1472 /* remount read-only */ 1473 if (s->s_flags & MS_RDONLY) 1474 /* it is read-only already */ 1475 goto out_ok_unlocked; 1476 1477 err = dquot_suspend(s, -1); 1478 if (err < 0) 1479 goto out_err; 1480 1481 /* try to remount file system with read-only permissions */ 1482 if (sb_umount_state(rs) == REISERFS_VALID_FS 1483 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) { 1484 goto out_ok_unlocked; 1485 } 1486 1487 reiserfs_write_lock(s); 1488 1489 err = journal_begin(&th, s, 10); 1490 if (err) 1491 goto out_err_unlock; 1492 1493 /* Mounting a rw partition read-only. */ 1494 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 1495 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state); 1496 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 1497 } else { 1498 /* remount read-write */ 1499 if (!(s->s_flags & MS_RDONLY)) { 1500 reiserfs_write_unlock(s); 1501 reiserfs_xattr_init(s, *mount_flags); 1502 goto out_ok_unlocked; /* We are read-write already */ 1503 } 1504 1505 if (reiserfs_is_journal_aborted(journal)) { 1506 err = journal->j_errno; 1507 goto out_err_unlock; 1508 } 1509 1510 handle_data_mode(s, mount_options); 1511 handle_barrier_mode(s, mount_options); 1512 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); 1513 1514 /* now it is safe to call journal_begin */ 1515 s->s_flags &= ~MS_RDONLY; 1516 err = journal_begin(&th, s, 10); 1517 if (err) 1518 goto out_err_unlock; 1519 1520 /* Mount a partition which is read-only, read-write */ 1521 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 1522 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); 1523 s->s_flags &= ~MS_RDONLY; 1524 set_sb_umount_state(rs, REISERFS_ERROR_FS); 1525 if (!old_format_only(s)) 1526 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); 1527 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */ 1528 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 1529 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS; 1530 } 1531 /* this will force a full flush of all journal lists */ 1532 SB_JOURNAL(s)->j_must_wait = 1; 1533 err = journal_end(&th); 1534 if (err) 1535 goto out_err_unlock; 1536 1537 reiserfs_write_unlock(s); 1538 if (!(*mount_flags & MS_RDONLY)) { 1539 dquot_resume(s, -1); 1540 reiserfs_write_lock(s); 1541 finish_unfinished(s); 1542 reiserfs_write_unlock(s); 1543 reiserfs_xattr_init(s, *mount_flags); 1544 } 1545 1546 out_ok_unlocked: 1547 replace_mount_options(s, new_opts); 1548 return 0; 1549 1550 out_err_unlock: 1551 reiserfs_write_unlock(s); 1552 out_err: 1553 kfree(new_opts); 1554 return err; 1555 } 1556 1557 static int read_super_block(struct super_block *s, int offset) 1558 { 1559 struct buffer_head *bh; 1560 struct reiserfs_super_block *rs; 1561 int fs_blocksize; 1562 1563 bh = sb_bread(s, offset / s->s_blocksize); 1564 if (!bh) { 1565 reiserfs_warning(s, "sh-2006", 1566 "bread failed (dev %s, block %lu, size %lu)", 1567 s->s_id, offset / s->s_blocksize, 1568 s->s_blocksize); 1569 return 1; 1570 } 1571 1572 rs = (struct reiserfs_super_block *)bh->b_data; 1573 if (!is_any_reiserfs_magic_string(rs)) { 1574 brelse(bh); 1575 return 1; 1576 } 1577 /* 1578 * ok, reiserfs signature (old or new) found in at the given offset 1579 */ 1580 fs_blocksize = sb_blocksize(rs); 1581 brelse(bh); 1582 sb_set_blocksize(s, fs_blocksize); 1583 1584 bh = sb_bread(s, offset / s->s_blocksize); 1585 if (!bh) { 1586 reiserfs_warning(s, "sh-2007", 1587 "bread failed (dev %s, block %lu, size %lu)", 1588 s->s_id, offset / s->s_blocksize, 1589 s->s_blocksize); 1590 return 1; 1591 } 1592 1593 rs = (struct reiserfs_super_block *)bh->b_data; 1594 if (sb_blocksize(rs) != s->s_blocksize) { 1595 reiserfs_warning(s, "sh-2011", "can't find a reiserfs " 1596 "filesystem on (dev %s, block %llu, size %lu)", 1597 s->s_id, 1598 (unsigned long long)bh->b_blocknr, 1599 s->s_blocksize); 1600 brelse(bh); 1601 return 1; 1602 } 1603 1604 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) { 1605 brelse(bh); 1606 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck " 1607 "--rebuild-tree run detected. Please run\n" 1608 "reiserfsck --rebuild-tree and wait for a " 1609 "completion. If that fails\n" 1610 "get newer reiserfsprogs package"); 1611 return 1; 1612 } 1613 1614 SB_BUFFER_WITH_SB(s) = bh; 1615 SB_DISK_SUPER_BLOCK(s) = rs; 1616 1617 /* 1618 * magic is of non-standard journal filesystem, look at s_version to 1619 * find which format is in use 1620 */ 1621 if (is_reiserfs_jr(rs)) { 1622 if (sb_version(rs) == REISERFS_VERSION_2) 1623 reiserfs_info(s, "found reiserfs format \"3.6\"" 1624 " with non-standard journal\n"); 1625 else if (sb_version(rs) == REISERFS_VERSION_1) 1626 reiserfs_info(s, "found reiserfs format \"3.5\"" 1627 " with non-standard journal\n"); 1628 else { 1629 reiserfs_warning(s, "sh-2012", "found unknown " 1630 "format \"%u\" of reiserfs with " 1631 "non-standard magic", sb_version(rs)); 1632 return 1; 1633 } 1634 } else 1635 /* 1636 * s_version of standard format may contain incorrect 1637 * information, so we just look at the magic string 1638 */ 1639 reiserfs_info(s, 1640 "found reiserfs format \"%s\" with standard journal\n", 1641 is_reiserfs_3_5(rs) ? "3.5" : "3.6"); 1642 1643 s->s_op = &reiserfs_sops; 1644 s->s_export_op = &reiserfs_export_ops; 1645 #ifdef CONFIG_QUOTA 1646 s->s_qcop = &reiserfs_qctl_operations; 1647 s->dq_op = &reiserfs_quota_operations; 1648 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1649 #endif 1650 1651 /* 1652 * new format is limited by the 32 bit wide i_blocks field, want to 1653 * be one full block below that. 1654 */ 1655 s->s_maxbytes = (512LL << 32) - s->s_blocksize; 1656 return 0; 1657 } 1658 1659 /* after journal replay, reread all bitmap and super blocks */ 1660 static int reread_meta_blocks(struct super_block *s) 1661 { 1662 ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s)); 1663 wait_on_buffer(SB_BUFFER_WITH_SB(s)); 1664 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) { 1665 reiserfs_warning(s, "reiserfs-2504", "error reading the super"); 1666 return 1; 1667 } 1668 1669 return 0; 1670 } 1671 1672 /* hash detection stuff */ 1673 1674 /* 1675 * if root directory is empty - we set default - Yura's - hash and 1676 * warn about it 1677 * FIXME: we look for only one name in a directory. If tea and yura 1678 * both have the same value - we ask user to send report to the 1679 * mailing list 1680 */ 1681 static __u32 find_hash_out(struct super_block *s) 1682 { 1683 int retval; 1684 struct inode *inode; 1685 struct cpu_key key; 1686 INITIALIZE_PATH(path); 1687 struct reiserfs_dir_entry de; 1688 struct reiserfs_de_head *deh; 1689 __u32 hash = DEFAULT_HASH; 1690 __u32 deh_hashval, teahash, r5hash, yurahash; 1691 1692 inode = d_inode(s->s_root); 1693 1694 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3); 1695 retval = search_by_entry_key(s, &key, &path, &de); 1696 if (retval == IO_ERROR) { 1697 pathrelse(&path); 1698 return UNSET_HASH; 1699 } 1700 if (retval == NAME_NOT_FOUND) 1701 de.de_entry_num--; 1702 1703 set_de_name_and_namelen(&de); 1704 deh = de.de_deh + de.de_entry_num; 1705 1706 if (deh_offset(deh) == DOT_DOT_OFFSET) { 1707 /* allow override in this case */ 1708 if (reiserfs_rupasov_hash(s)) 1709 hash = YURA_HASH; 1710 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n"); 1711 goto out; 1712 } 1713 1714 deh_hashval = GET_HASH_VALUE(deh_offset(deh)); 1715 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen)); 1716 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen)); 1717 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen)); 1718 1719 if ((teahash == r5hash && deh_hashval == r5hash) || 1720 (teahash == yurahash && deh_hashval == yurahash) || 1721 (r5hash == yurahash && deh_hashval == yurahash)) { 1722 reiserfs_warning(s, "reiserfs-2506", 1723 "Unable to automatically detect hash " 1724 "function. Please mount with -o " 1725 "hash={tea,rupasov,r5}"); 1726 hash = UNSET_HASH; 1727 goto out; 1728 } 1729 1730 if (deh_hashval == yurahash) 1731 hash = YURA_HASH; 1732 else if (deh_hashval == teahash) 1733 hash = TEA_HASH; 1734 else if (deh_hashval == r5hash) 1735 hash = R5_HASH; 1736 else { 1737 reiserfs_warning(s, "reiserfs-2506", 1738 "Unrecognised hash function"); 1739 hash = UNSET_HASH; 1740 } 1741 out: 1742 pathrelse(&path); 1743 return hash; 1744 } 1745 1746 /* finds out which hash names are sorted with */ 1747 static int what_hash(struct super_block *s) 1748 { 1749 __u32 code; 1750 1751 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s)); 1752 1753 /* 1754 * reiserfs_hash_detect() == true if any of the hash mount options 1755 * were used. We must check them to make sure the user isn't 1756 * using a bad hash value 1757 */ 1758 if (code == UNSET_HASH || reiserfs_hash_detect(s)) 1759 code = find_hash_out(s); 1760 1761 if (code != UNSET_HASH && reiserfs_hash_detect(s)) { 1762 /* 1763 * detection has found the hash, and we must check against the 1764 * mount options 1765 */ 1766 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) { 1767 reiserfs_warning(s, "reiserfs-2507", 1768 "Error, %s hash detected, " 1769 "unable to force rupasov hash", 1770 reiserfs_hashname(code)); 1771 code = UNSET_HASH; 1772 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) { 1773 reiserfs_warning(s, "reiserfs-2508", 1774 "Error, %s hash detected, " 1775 "unable to force tea hash", 1776 reiserfs_hashname(code)); 1777 code = UNSET_HASH; 1778 } else if (reiserfs_r5_hash(s) && code != R5_HASH) { 1779 reiserfs_warning(s, "reiserfs-2509", 1780 "Error, %s hash detected, " 1781 "unable to force r5 hash", 1782 reiserfs_hashname(code)); 1783 code = UNSET_HASH; 1784 } 1785 } else { 1786 /* 1787 * find_hash_out was not called or 1788 * could not determine the hash 1789 */ 1790 if (reiserfs_rupasov_hash(s)) { 1791 code = YURA_HASH; 1792 } else if (reiserfs_tea_hash(s)) { 1793 code = TEA_HASH; 1794 } else if (reiserfs_r5_hash(s)) { 1795 code = R5_HASH; 1796 } 1797 } 1798 1799 /* 1800 * if we are mounted RW, and we have a new valid hash code, update 1801 * the super 1802 */ 1803 if (code != UNSET_HASH && 1804 !(s->s_flags & MS_RDONLY) && 1805 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) { 1806 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code); 1807 } 1808 return code; 1809 } 1810 1811 /* return pointer to appropriate function */ 1812 static hashf_t hash_function(struct super_block *s) 1813 { 1814 switch (what_hash(s)) { 1815 case TEA_HASH: 1816 reiserfs_info(s, "Using tea hash to sort names\n"); 1817 return keyed_hash; 1818 case YURA_HASH: 1819 reiserfs_info(s, "Using rupasov hash to sort names\n"); 1820 return yura_hash; 1821 case R5_HASH: 1822 reiserfs_info(s, "Using r5 hash to sort names\n"); 1823 return r5_hash; 1824 } 1825 return NULL; 1826 } 1827 1828 /* this is used to set up correct value for old partitions */ 1829 static int function2code(hashf_t func) 1830 { 1831 if (func == keyed_hash) 1832 return TEA_HASH; 1833 if (func == yura_hash) 1834 return YURA_HASH; 1835 if (func == r5_hash) 1836 return R5_HASH; 1837 1838 BUG(); /* should never happen */ 1839 1840 return 0; 1841 } 1842 1843 #define SWARN(silent, s, id, ...) \ 1844 if (!(silent)) \ 1845 reiserfs_warning(s, id, __VA_ARGS__) 1846 1847 static int reiserfs_fill_super(struct super_block *s, void *data, int silent) 1848 { 1849 struct inode *root_inode; 1850 struct reiserfs_transaction_handle th; 1851 int old_format = 0; 1852 unsigned long blocks; 1853 unsigned int commit_max_age = 0; 1854 int jinit_done = 0; 1855 struct reiserfs_iget_args args; 1856 struct reiserfs_super_block *rs; 1857 char *jdev_name; 1858 struct reiserfs_sb_info *sbi; 1859 int errval = -EINVAL; 1860 char *qf_names[REISERFS_MAXQUOTAS] = {}; 1861 unsigned int qfmt = 0; 1862 1863 save_mount_options(s, data); 1864 1865 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL); 1866 if (!sbi) 1867 return -ENOMEM; 1868 s->s_fs_info = sbi; 1869 /* Set default values for options: non-aggressive tails, RO on errors */ 1870 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL); 1871 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO); 1872 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH); 1873 /* no preallocation minimum, be smart in reiserfs_file_write instead */ 1874 sbi->s_alloc_options.preallocmin = 0; 1875 /* Preallocate by 16 blocks (17-1) at once */ 1876 sbi->s_alloc_options.preallocsize = 17; 1877 /* setup default block allocator options */ 1878 reiserfs_init_alloc_options(s); 1879 1880 spin_lock_init(&sbi->old_work_lock); 1881 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits); 1882 mutex_init(&sbi->lock); 1883 sbi->lock_depth = -1; 1884 1885 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0, 1886 s->s_id); 1887 if (!sbi->commit_wq) { 1888 SWARN(silent, s, "", "Cannot allocate commit workqueue"); 1889 errval = -ENOMEM; 1890 goto error_unlocked; 1891 } 1892 1893 jdev_name = NULL; 1894 if (reiserfs_parse_options 1895 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name, 1896 &commit_max_age, qf_names, &qfmt) == 0) { 1897 goto error_unlocked; 1898 } 1899 if (jdev_name && jdev_name[0]) { 1900 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL); 1901 if (!sbi->s_jdev) { 1902 SWARN(silent, s, "", "Cannot allocate memory for " 1903 "journal device name"); 1904 goto error; 1905 } 1906 } 1907 #ifdef CONFIG_QUOTA 1908 handle_quota_files(s, qf_names, &qfmt); 1909 #endif 1910 1911 if (blocks) { 1912 SWARN(silent, s, "jmacd-7", "resize option for remount only"); 1913 goto error_unlocked; 1914 } 1915 1916 /* 1917 * try old format (undistributed bitmap, super block in 8-th 1k 1918 * block of a device) 1919 */ 1920 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES)) 1921 old_format = 1; 1922 1923 /* 1924 * try new format (64-th 1k block), which can contain reiserfs 1925 * super block 1926 */ 1927 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) { 1928 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s", 1929 s->s_id); 1930 goto error_unlocked; 1931 } 1932 1933 rs = SB_DISK_SUPER_BLOCK(s); 1934 /* 1935 * Let's do basic sanity check to verify that underlying device is not 1936 * smaller than the filesystem. If the check fails then abort and 1937 * scream, because bad stuff will happen otherwise. 1938 */ 1939 if (s->s_bdev && s->s_bdev->bd_inode 1940 && i_size_read(s->s_bdev->bd_inode) < 1941 sb_block_count(rs) * sb_blocksize(rs)) { 1942 SWARN(silent, s, "", "Filesystem cannot be " 1943 "mounted because it is bigger than the device"); 1944 SWARN(silent, s, "", "You may need to run fsck " 1945 "or increase size of your LVM partition"); 1946 SWARN(silent, s, "", "Or may be you forgot to " 1947 "reboot after fdisk when it told you to"); 1948 goto error_unlocked; 1949 } 1950 1951 sbi->s_mount_state = SB_REISERFS_STATE(s); 1952 sbi->s_mount_state = REISERFS_VALID_FS; 1953 1954 if ((errval = reiserfs_init_bitmap_cache(s))) { 1955 SWARN(silent, s, "jmacd-8", "unable to read bitmap"); 1956 goto error_unlocked; 1957 } 1958 1959 errval = -EINVAL; 1960 #ifdef CONFIG_REISERFS_CHECK 1961 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON"); 1962 SWARN(silent, s, "", "- it is slow mode for debugging."); 1963 #endif 1964 1965 /* make data=ordered the default */ 1966 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) && 1967 !reiserfs_data_writeback(s)) { 1968 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED); 1969 } 1970 1971 if (reiserfs_data_log(s)) { 1972 reiserfs_info(s, "using journaled data mode\n"); 1973 } else if (reiserfs_data_ordered(s)) { 1974 reiserfs_info(s, "using ordered data mode\n"); 1975 } else { 1976 reiserfs_info(s, "using writeback data mode\n"); 1977 } 1978 if (reiserfs_barrier_flush(s)) { 1979 printk("reiserfs: using flush barriers\n"); 1980 } 1981 1982 if (journal_init(s, jdev_name, old_format, commit_max_age)) { 1983 SWARN(silent, s, "sh-2022", 1984 "unable to initialize journal space"); 1985 goto error_unlocked; 1986 } else { 1987 /* 1988 * once this is set, journal_release must be called 1989 * if we error out of the mount 1990 */ 1991 jinit_done = 1; 1992 } 1993 1994 if (reread_meta_blocks(s)) { 1995 SWARN(silent, s, "jmacd-9", 1996 "unable to reread meta blocks after journal init"); 1997 goto error_unlocked; 1998 } 1999 2000 if (replay_only(s)) 2001 goto error_unlocked; 2002 2003 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) { 2004 SWARN(silent, s, "clm-7000", 2005 "Detected readonly device, marking FS readonly"); 2006 s->s_flags |= MS_RDONLY; 2007 } 2008 args.objectid = REISERFS_ROOT_OBJECTID; 2009 args.dirid = REISERFS_ROOT_PARENT_OBJECTID; 2010 root_inode = 2011 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor, 2012 reiserfs_init_locked_inode, (void *)&args); 2013 if (!root_inode) { 2014 SWARN(silent, s, "jmacd-10", "get root inode failed"); 2015 goto error_unlocked; 2016 } 2017 2018 /* 2019 * This path assumed to be called with the BKL in the old times. 2020 * Now we have inherited the big reiserfs lock from it and many 2021 * reiserfs helpers called in the mount path and elsewhere require 2022 * this lock to be held even if it's not always necessary. Let's be 2023 * conservative and hold it early. The window can be reduced after 2024 * careful review of the code. 2025 */ 2026 reiserfs_write_lock(s); 2027 2028 if (root_inode->i_state & I_NEW) { 2029 reiserfs_read_locked_inode(root_inode, &args); 2030 unlock_new_inode(root_inode); 2031 } 2032 2033 s->s_root = d_make_root(root_inode); 2034 if (!s->s_root) 2035 goto error; 2036 /* define and initialize hash function */ 2037 sbi->s_hash_function = hash_function(s); 2038 if (sbi->s_hash_function == NULL) { 2039 dput(s->s_root); 2040 s->s_root = NULL; 2041 goto error; 2042 } 2043 2044 if (is_reiserfs_3_5(rs) 2045 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1)) 2046 set_bit(REISERFS_3_5, &sbi->s_properties); 2047 else if (old_format) 2048 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties); 2049 else 2050 set_bit(REISERFS_3_6, &sbi->s_properties); 2051 2052 if (!(s->s_flags & MS_RDONLY)) { 2053 2054 errval = journal_begin(&th, s, 1); 2055 if (errval) { 2056 dput(s->s_root); 2057 s->s_root = NULL; 2058 goto error; 2059 } 2060 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 2061 2062 set_sb_umount_state(rs, REISERFS_ERROR_FS); 2063 set_sb_fs_state(rs, 0); 2064 2065 /* 2066 * Clear out s_bmap_nr if it would wrap. We can handle this 2067 * case, but older revisions can't. This will cause the 2068 * file system to fail mount on those older implementations, 2069 * avoiding corruption. -jeffm 2070 */ 2071 if (bmap_would_wrap(reiserfs_bmap_count(s)) && 2072 sb_bmap_nr(rs) != 0) { 2073 reiserfs_warning(s, "super-2030", "This file system " 2074 "claims to use %u bitmap blocks in " 2075 "its super block, but requires %u. " 2076 "Clearing to zero.", sb_bmap_nr(rs), 2077 reiserfs_bmap_count(s)); 2078 2079 set_sb_bmap_nr(rs, 0); 2080 } 2081 2082 if (old_format_only(s)) { 2083 /* 2084 * filesystem of format 3.5 either with standard 2085 * or non-standard journal 2086 */ 2087 if (convert_reiserfs(s)) { 2088 /* and -o conv is given */ 2089 if (!silent) 2090 reiserfs_info(s, 2091 "converting 3.5 filesystem to the 3.6 format"); 2092 2093 if (is_reiserfs_3_5(rs)) 2094 /* 2095 * put magic string of 3.6 format. 2096 * 2.2 will not be able to 2097 * mount this filesystem anymore 2098 */ 2099 memcpy(rs->s_v1.s_magic, 2100 reiserfs_3_6_magic_string, 2101 sizeof 2102 (reiserfs_3_6_magic_string)); 2103 2104 set_sb_version(rs, REISERFS_VERSION_2); 2105 reiserfs_convert_objectid_map_v1(s); 2106 set_bit(REISERFS_3_6, &sbi->s_properties); 2107 clear_bit(REISERFS_3_5, &sbi->s_properties); 2108 } else if (!silent) { 2109 reiserfs_info(s, "using 3.5.x disk format\n"); 2110 } 2111 } else 2112 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); 2113 2114 2115 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); 2116 errval = journal_end(&th); 2117 if (errval) { 2118 dput(s->s_root); 2119 s->s_root = NULL; 2120 goto error; 2121 } 2122 2123 reiserfs_write_unlock(s); 2124 if ((errval = reiserfs_lookup_privroot(s)) || 2125 (errval = reiserfs_xattr_init(s, s->s_flags))) { 2126 dput(s->s_root); 2127 s->s_root = NULL; 2128 goto error_unlocked; 2129 } 2130 reiserfs_write_lock(s); 2131 2132 /* 2133 * look for files which were to be removed in previous session 2134 */ 2135 finish_unfinished(s); 2136 } else { 2137 if (old_format_only(s) && !silent) { 2138 reiserfs_info(s, "using 3.5.x disk format\n"); 2139 } 2140 2141 reiserfs_write_unlock(s); 2142 if ((errval = reiserfs_lookup_privroot(s)) || 2143 (errval = reiserfs_xattr_init(s, s->s_flags))) { 2144 dput(s->s_root); 2145 s->s_root = NULL; 2146 goto error_unlocked; 2147 } 2148 reiserfs_write_lock(s); 2149 } 2150 /* 2151 * mark hash in super block: it could be unset. overwrite should be ok 2152 */ 2153 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function)); 2154 2155 handle_attrs(s); 2156 2157 reiserfs_proc_info_init(s); 2158 2159 init_waitqueue_head(&(sbi->s_wait)); 2160 spin_lock_init(&sbi->bitmap_lock); 2161 2162 reiserfs_write_unlock(s); 2163 2164 return (0); 2165 2166 error: 2167 reiserfs_write_unlock(s); 2168 2169 error_unlocked: 2170 /* kill the commit thread, free journal ram */ 2171 if (jinit_done) { 2172 reiserfs_write_lock(s); 2173 journal_release_error(NULL, s); 2174 reiserfs_write_unlock(s); 2175 } 2176 2177 if (sbi->commit_wq) 2178 destroy_workqueue(sbi->commit_wq); 2179 2180 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work); 2181 2182 reiserfs_free_bitmap_cache(s); 2183 if (SB_BUFFER_WITH_SB(s)) 2184 brelse(SB_BUFFER_WITH_SB(s)); 2185 #ifdef CONFIG_QUOTA 2186 { 2187 int j; 2188 for (j = 0; j < REISERFS_MAXQUOTAS; j++) 2189 kfree(qf_names[j]); 2190 } 2191 #endif 2192 kfree(sbi); 2193 2194 s->s_fs_info = NULL; 2195 return errval; 2196 } 2197 2198 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf) 2199 { 2200 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb); 2201 2202 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize)); 2203 buf->f_bfree = sb_free_blocks(rs); 2204 buf->f_bavail = buf->f_bfree; 2205 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1; 2206 buf->f_bsize = dentry->d_sb->s_blocksize; 2207 /* changed to accommodate gcc folks. */ 2208 buf->f_type = REISERFS_SUPER_MAGIC; 2209 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2); 2210 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2, 2211 sizeof(rs->s_uuid)/2); 2212 2213 return 0; 2214 } 2215 2216 #ifdef CONFIG_QUOTA 2217 static int reiserfs_write_dquot(struct dquot *dquot) 2218 { 2219 struct reiserfs_transaction_handle th; 2220 int ret, err; 2221 int depth; 2222 2223 reiserfs_write_lock(dquot->dq_sb); 2224 ret = 2225 journal_begin(&th, dquot->dq_sb, 2226 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 2227 if (ret) 2228 goto out; 2229 depth = reiserfs_write_unlock_nested(dquot->dq_sb); 2230 ret = dquot_commit(dquot); 2231 reiserfs_write_lock_nested(dquot->dq_sb, depth); 2232 err = journal_end(&th); 2233 if (!ret && err) 2234 ret = err; 2235 out: 2236 reiserfs_write_unlock(dquot->dq_sb); 2237 return ret; 2238 } 2239 2240 static int reiserfs_acquire_dquot(struct dquot *dquot) 2241 { 2242 struct reiserfs_transaction_handle th; 2243 int ret, err; 2244 int depth; 2245 2246 reiserfs_write_lock(dquot->dq_sb); 2247 ret = 2248 journal_begin(&th, dquot->dq_sb, 2249 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 2250 if (ret) 2251 goto out; 2252 depth = reiserfs_write_unlock_nested(dquot->dq_sb); 2253 ret = dquot_acquire(dquot); 2254 reiserfs_write_lock_nested(dquot->dq_sb, depth); 2255 err = journal_end(&th); 2256 if (!ret && err) 2257 ret = err; 2258 out: 2259 reiserfs_write_unlock(dquot->dq_sb); 2260 return ret; 2261 } 2262 2263 static int reiserfs_release_dquot(struct dquot *dquot) 2264 { 2265 struct reiserfs_transaction_handle th; 2266 int ret, err; 2267 2268 reiserfs_write_lock(dquot->dq_sb); 2269 ret = 2270 journal_begin(&th, dquot->dq_sb, 2271 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 2272 reiserfs_write_unlock(dquot->dq_sb); 2273 if (ret) { 2274 /* Release dquot anyway to avoid endless cycle in dqput() */ 2275 dquot_release(dquot); 2276 goto out; 2277 } 2278 ret = dquot_release(dquot); 2279 reiserfs_write_lock(dquot->dq_sb); 2280 err = journal_end(&th); 2281 if (!ret && err) 2282 ret = err; 2283 reiserfs_write_unlock(dquot->dq_sb); 2284 out: 2285 return ret; 2286 } 2287 2288 static int reiserfs_mark_dquot_dirty(struct dquot *dquot) 2289 { 2290 /* Are we journaling quotas? */ 2291 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 2292 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 2293 dquot_mark_dquot_dirty(dquot); 2294 return reiserfs_write_dquot(dquot); 2295 } else 2296 return dquot_mark_dquot_dirty(dquot); 2297 } 2298 2299 static int reiserfs_write_info(struct super_block *sb, int type) 2300 { 2301 struct reiserfs_transaction_handle th; 2302 int ret, err; 2303 int depth; 2304 2305 /* Data block + inode block */ 2306 reiserfs_write_lock(sb); 2307 ret = journal_begin(&th, sb, 2); 2308 if (ret) 2309 goto out; 2310 depth = reiserfs_write_unlock_nested(sb); 2311 ret = dquot_commit_info(sb, type); 2312 reiserfs_write_lock_nested(sb, depth); 2313 err = journal_end(&th); 2314 if (!ret && err) 2315 ret = err; 2316 out: 2317 reiserfs_write_unlock(sb); 2318 return ret; 2319 } 2320 2321 /* 2322 * Turn on quotas during mount time - we need to find the quota file and such... 2323 */ 2324 static int reiserfs_quota_on_mount(struct super_block *sb, int type) 2325 { 2326 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type], 2327 REISERFS_SB(sb)->s_jquota_fmt, type); 2328 } 2329 2330 /* 2331 * Standard function to be called on quota_on 2332 */ 2333 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id, 2334 struct path *path) 2335 { 2336 int err; 2337 struct inode *inode; 2338 struct reiserfs_transaction_handle th; 2339 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA; 2340 2341 reiserfs_write_lock(sb); 2342 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) { 2343 err = -EINVAL; 2344 goto out; 2345 } 2346 2347 /* Quotafile not on the same filesystem? */ 2348 if (path->dentry->d_sb != sb) { 2349 err = -EXDEV; 2350 goto out; 2351 } 2352 inode = d_inode(path->dentry); 2353 /* 2354 * We must not pack tails for quota files on reiserfs for quota 2355 * IO to work 2356 */ 2357 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) { 2358 err = reiserfs_unpack(inode, NULL); 2359 if (err) { 2360 reiserfs_warning(sb, "super-6520", 2361 "Unpacking tail of quota file failed" 2362 " (%d). Cannot turn on quotas.", err); 2363 err = -EINVAL; 2364 goto out; 2365 } 2366 mark_inode_dirty(inode); 2367 } 2368 /* Journaling quota? */ 2369 if (REISERFS_SB(sb)->s_qf_names[type]) { 2370 /* Quotafile not of fs root? */ 2371 if (path->dentry->d_parent != sb->s_root) 2372 reiserfs_warning(sb, "super-6521", 2373 "Quota file not on filesystem root. " 2374 "Journalled quota will not work."); 2375 } 2376 2377 /* 2378 * When we journal data on quota file, we have to flush journal to see 2379 * all updates to the file when we bypass pagecache... 2380 */ 2381 if (reiserfs_file_data_log(inode)) { 2382 /* Just start temporary transaction and finish it */ 2383 err = journal_begin(&th, sb, 1); 2384 if (err) 2385 goto out; 2386 err = journal_end_sync(&th); 2387 if (err) 2388 goto out; 2389 } 2390 reiserfs_write_unlock(sb); 2391 return dquot_quota_on(sb, type, format_id, path); 2392 out: 2393 reiserfs_write_unlock(sb); 2394 return err; 2395 } 2396 2397 /* 2398 * Read data from quotafile - avoid pagecache and such because we cannot afford 2399 * acquiring the locks... As quota files are never truncated and quota code 2400 * itself serializes the operations (and no one else should touch the files) 2401 * we don't have to be afraid of races 2402 */ 2403 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data, 2404 size_t len, loff_t off) 2405 { 2406 struct inode *inode = sb_dqopt(sb)->files[type]; 2407 unsigned long blk = off >> sb->s_blocksize_bits; 2408 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; 2409 size_t toread; 2410 struct buffer_head tmp_bh, *bh; 2411 loff_t i_size = i_size_read(inode); 2412 2413 if (off > i_size) 2414 return 0; 2415 if (off + len > i_size) 2416 len = i_size - off; 2417 toread = len; 2418 while (toread > 0) { 2419 tocopy = 2420 sb->s_blocksize - offset < 2421 toread ? sb->s_blocksize - offset : toread; 2422 tmp_bh.b_state = 0; 2423 /* 2424 * Quota files are without tails so we can safely 2425 * use this function 2426 */ 2427 reiserfs_write_lock(sb); 2428 err = reiserfs_get_block(inode, blk, &tmp_bh, 0); 2429 reiserfs_write_unlock(sb); 2430 if (err) 2431 return err; 2432 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 2433 memset(data, 0, tocopy); 2434 else { 2435 bh = sb_bread(sb, tmp_bh.b_blocknr); 2436 if (!bh) 2437 return -EIO; 2438 memcpy(data, bh->b_data + offset, tocopy); 2439 brelse(bh); 2440 } 2441 offset = 0; 2442 toread -= tocopy; 2443 data += tocopy; 2444 blk++; 2445 } 2446 return len; 2447 } 2448 2449 /* 2450 * Write to quotafile (we know the transaction is already started and has 2451 * enough credits) 2452 */ 2453 static ssize_t reiserfs_quota_write(struct super_block *sb, int type, 2454 const char *data, size_t len, loff_t off) 2455 { 2456 struct inode *inode = sb_dqopt(sb)->files[type]; 2457 unsigned long blk = off >> sb->s_blocksize_bits; 2458 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; 2459 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL; 2460 size_t towrite = len; 2461 struct buffer_head tmp_bh, *bh; 2462 2463 if (!current->journal_info) { 2464 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n", 2465 (unsigned long long)off, (unsigned long long)len); 2466 return -EIO; 2467 } 2468 while (towrite > 0) { 2469 tocopy = sb->s_blocksize - offset < towrite ? 2470 sb->s_blocksize - offset : towrite; 2471 tmp_bh.b_state = 0; 2472 reiserfs_write_lock(sb); 2473 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE); 2474 reiserfs_write_unlock(sb); 2475 if (err) 2476 goto out; 2477 if (offset || tocopy != sb->s_blocksize) 2478 bh = sb_bread(sb, tmp_bh.b_blocknr); 2479 else 2480 bh = sb_getblk(sb, tmp_bh.b_blocknr); 2481 if (!bh) { 2482 err = -EIO; 2483 goto out; 2484 } 2485 lock_buffer(bh); 2486 memcpy(bh->b_data + offset, data, tocopy); 2487 flush_dcache_page(bh->b_page); 2488 set_buffer_uptodate(bh); 2489 unlock_buffer(bh); 2490 reiserfs_write_lock(sb); 2491 reiserfs_prepare_for_journal(sb, bh, 1); 2492 journal_mark_dirty(current->journal_info, bh); 2493 if (!journal_quota) 2494 reiserfs_add_ordered_list(inode, bh); 2495 reiserfs_write_unlock(sb); 2496 brelse(bh); 2497 offset = 0; 2498 towrite -= tocopy; 2499 data += tocopy; 2500 blk++; 2501 } 2502 out: 2503 if (len == towrite) 2504 return err; 2505 if (inode->i_size < off + len - towrite) 2506 i_size_write(inode, off + len - towrite); 2507 inode->i_version++; 2508 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2509 mark_inode_dirty(inode); 2510 return len - towrite; 2511 } 2512 2513 #endif 2514 2515 static struct dentry *get_super_block(struct file_system_type *fs_type, 2516 int flags, const char *dev_name, 2517 void *data) 2518 { 2519 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super); 2520 } 2521 2522 static int __init init_reiserfs_fs(void) 2523 { 2524 int ret; 2525 2526 ret = init_inodecache(); 2527 if (ret) 2528 return ret; 2529 2530 reiserfs_proc_info_global_init(); 2531 2532 ret = register_filesystem(&reiserfs_fs_type); 2533 if (ret) 2534 goto out; 2535 2536 return 0; 2537 out: 2538 reiserfs_proc_info_global_done(); 2539 destroy_inodecache(); 2540 2541 return ret; 2542 } 2543 2544 static void __exit exit_reiserfs_fs(void) 2545 { 2546 reiserfs_proc_info_global_done(); 2547 unregister_filesystem(&reiserfs_fs_type); 2548 destroy_inodecache(); 2549 } 2550 2551 struct file_system_type reiserfs_fs_type = { 2552 .owner = THIS_MODULE, 2553 .name = "reiserfs", 2554 .mount = get_super_block, 2555 .kill_sb = reiserfs_kill_sb, 2556 .fs_flags = FS_REQUIRES_DEV, 2557 }; 2558 MODULE_ALIAS_FS("reiserfs"); 2559 2560 MODULE_DESCRIPTION("ReiserFS journaled filesystem"); 2561 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>"); 2562 MODULE_LICENSE("GPL"); 2563 2564 module_init(init_reiserfs_fs); 2565 module_exit(exit_reiserfs_fs); 2566