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