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