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