1/* 2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README 3 * 4 * Trivial changes by Alan Cox to add the LFS fixes 5 * 6 * Trivial Changes: 7 * Rights granted to Hans Reiser to redistribute under other terms providing 8 * he accepts all liability including but not limited to patent, fitness 9 * for purpose, and direct or indirect claims arising from failure to perform. 10 * 11 * NO WARRANTY 12 */ 13 14#include <linux/module.h> 15#include <linux/slab.h> 16#include <linux/vmalloc.h> 17#include <linux/time.h> 18#include <asm/uaccess.h> 19#include <linux/reiserfs_fs.h> 20#include <linux/reiserfs_acl.h> 21#include <linux/reiserfs_xattr.h> 22#include <linux/init.h> 23#include <linux/blkdev.h> 24#include <linux/buffer_head.h> 25#include <linux/exportfs.h> 26#include <linux/quotaops.h> 27#include <linux/vfs.h> 28#include <linux/mount.h> 29#include <linux/namei.h> 30#include <linux/crc32.h> 31#include <linux/smp_lock.h> 32 33struct file_system_type reiserfs_fs_type; 34 35static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING; 36static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING; 37static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING; 38 39int is_reiserfs_3_5(struct reiserfs_super_block *rs) 40{ 41 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string, 42 strlen(reiserfs_3_5_magic_string)); 43} 44 45int is_reiserfs_3_6(struct reiserfs_super_block *rs) 46{ 47 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string, 48 strlen(reiserfs_3_6_magic_string)); 49} 50 51int is_reiserfs_jr(struct reiserfs_super_block *rs) 52{ 53 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string, 54 strlen(reiserfs_jr_magic_string)); 55} 56 57static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs) 58{ 59 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) || 60 is_reiserfs_jr(rs)); 61} 62 63static int reiserfs_remount(struct super_block *s, int *flags, char *data); 64static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf); 65 66static int reiserfs_sync_fs(struct super_block *s, int wait) 67{ 68 struct reiserfs_transaction_handle th; 69 70 reiserfs_write_lock(s); 71 if (!journal_begin(&th, s, 1)) 72 if (!journal_end_sync(&th, s, 1)) 73 reiserfs_flush_old_commits(s); 74 s->s_dirt = 0; /* Even if it's not true. 75 * We'll loop forever in sync_supers otherwise */ 76 reiserfs_write_unlock(s); 77 return 0; 78} 79 80static void reiserfs_write_super(struct super_block *s) 81{ 82 reiserfs_sync_fs(s, 1); 83} 84 85static int reiserfs_freeze(struct super_block *s) 86{ 87 struct reiserfs_transaction_handle th; 88 reiserfs_write_lock(s); 89 if (!(s->s_flags & MS_RDONLY)) { 90 int err = journal_begin(&th, s, 1); 91 if (err) { 92 reiserfs_block_writes(&th); 93 } else { 94 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 95 1); 96 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s)); 97 reiserfs_block_writes(&th); 98 journal_end_sync(&th, s, 1); 99 } 100 } 101 s->s_dirt = 0; 102 reiserfs_write_unlock(s); 103 return 0; 104} 105 106static int reiserfs_unfreeze(struct super_block *s) 107{ 108 reiserfs_allow_writes(s); 109 return 0; 110} 111 112extern const struct in_core_key MAX_IN_CORE_KEY; 113 114/* this is used to delete "save link" when there are no items of a 115 file it points to. It can either happen if unlink is completed but 116 "save unlink" removal, or if file has both unlink and truncate 117 pending and as unlink completes first (because key of "save link" 118 protecting unlink is bigger that a key lf "save link" which 119 protects truncate), so there left no items to make truncate 120 completion on */ 121static int remove_save_link_only(struct super_block *s, 122 struct reiserfs_key *key, int oid_free) 123{ 124 struct reiserfs_transaction_handle th; 125 int err; 126 127 /* we are going to do one balancing */ 128 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT); 129 if (err) 130 return err; 131 132 reiserfs_delete_solid_item(&th, NULL, key); 133 if (oid_free) 134 /* removals are protected by direct items */ 135 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid)); 136 137 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT); 138} 139 140#ifdef CONFIG_QUOTA 141static int reiserfs_quota_on_mount(struct super_block *, int); 142#endif 143 144/* look for uncompleted unlinks and truncates and complete them */ 145static int finish_unfinished(struct super_block *s) 146{ 147 INITIALIZE_PATH(path); 148 struct cpu_key max_cpu_key, obj_key; 149 struct reiserfs_key save_link_key, last_inode_key; 150 int retval = 0; 151 struct item_head *ih; 152 struct buffer_head *bh; 153 int item_pos; 154 char *item; 155 int done; 156 struct inode *inode; 157 int truncate; 158#ifdef CONFIG_QUOTA 159 int i; 160 int ms_active_set; 161 int quota_enabled[MAXQUOTAS]; 162#endif 163 164 /* compose key to look for "save" links */ 165 max_cpu_key.version = KEY_FORMAT_3_5; 166 max_cpu_key.on_disk_key.k_dir_id = ~0U; 167 max_cpu_key.on_disk_key.k_objectid = ~0U; 168 set_cpu_key_k_offset(&max_cpu_key, ~0U); 169 max_cpu_key.key_length = 3; 170 171 memset(&last_inode_key, 0, sizeof(last_inode_key)); 172 173#ifdef CONFIG_QUOTA 174 /* Needed for iput() to work correctly and not trash data */ 175 if (s->s_flags & MS_ACTIVE) { 176 ms_active_set = 0; 177 } else { 178 ms_active_set = 1; 179 s->s_flags |= MS_ACTIVE; 180 } 181 /* Turn on quotas so that they are updated correctly */ 182 for (i = 0; i < MAXQUOTAS; i++) { 183 quota_enabled[i] = 1; 184 if (REISERFS_SB(s)->s_qf_names[i]) { 185 int ret; 186 187 if (sb_has_quota_active(s, i)) { 188 quota_enabled[i] = 0; 189 continue; 190 } 191 ret = reiserfs_quota_on_mount(s, i); 192 if (ret < 0) 193 reiserfs_warning(s, "reiserfs-2500", 194 "cannot turn on journaled " 195 "quota: error %d", ret); 196 } 197 } 198#endif 199 200 done = 0; 201 REISERFS_SB(s)->s_is_unlinked_ok = 1; 202 while (!retval) { 203 retval = search_item(s, &max_cpu_key, &path); 204 if (retval != ITEM_NOT_FOUND) { 205 reiserfs_error(s, "vs-2140", 206 "search_by_key returned %d", retval); 207 break; 208 } 209 210 bh = get_last_bh(&path); 211 item_pos = get_item_pos(&path); 212 if (item_pos != B_NR_ITEMS(bh)) { 213 reiserfs_warning(s, "vs-2060", 214 "wrong position found"); 215 break; 216 } 217 item_pos--; 218 ih = B_N_PITEM_HEAD(bh, item_pos); 219 220 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID) 221 /* there are no "save" links anymore */ 222 break; 223 224 save_link_key = ih->ih_key; 225 if (is_indirect_le_ih(ih)) 226 truncate = 1; 227 else 228 truncate = 0; 229 230 /* reiserfs_iget needs k_dirid and k_objectid only */ 231 item = B_I_PITEM(bh, ih); 232 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item); 233 obj_key.on_disk_key.k_objectid = 234 le32_to_cpu(ih->ih_key.k_objectid); 235 obj_key.on_disk_key.k_offset = 0; 236 obj_key.on_disk_key.k_type = 0; 237 238 pathrelse(&path); 239 240 inode = reiserfs_iget(s, &obj_key); 241 if (!inode) { 242 /* the unlink almost completed, it just did not manage to remove 243 "save" link and release objectid */ 244 reiserfs_warning(s, "vs-2180", "iget failed for %K", 245 &obj_key); 246 retval = remove_save_link_only(s, &save_link_key, 1); 247 continue; 248 } 249 250 if (!truncate && inode->i_nlink) { 251 /* file is not unlinked */ 252 reiserfs_warning(s, "vs-2185", 253 "file %K is not unlinked", 254 &obj_key); 255 retval = remove_save_link_only(s, &save_link_key, 0); 256 continue; 257 } 258 dquot_initialize(inode); 259 260 if (truncate && S_ISDIR(inode->i_mode)) { 261 /* We got a truncate request for a dir which is impossible. 262 The only imaginable way is to execute unfinished truncate request 263 then boot into old kernel, remove the file and create dir with 264 the same key. */ 265 reiserfs_warning(s, "green-2101", 266 "impossible truncate on a " 267 "directory %k. Please report", 268 INODE_PKEY(inode)); 269 retval = remove_save_link_only(s, &save_link_key, 0); 270 truncate = 0; 271 iput(inode); 272 continue; 273 } 274 275 if (truncate) { 276 REISERFS_I(inode)->i_flags |= 277 i_link_saved_truncate_mask; 278 /* not completed truncate found. New size was committed together 279 with "save" link */ 280 reiserfs_info(s, "Truncating %k to %Ld ..", 281 INODE_PKEY(inode), inode->i_size); 282 reiserfs_truncate_file(inode, 283 0 284 /*don't update modification time */ 285 ); 286 retval = remove_save_link(inode, truncate); 287 } else { 288 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask; 289 /* not completed unlink (rmdir) found */ 290 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode)); 291 if (memcmp(&last_inode_key, INODE_PKEY(inode), 292 sizeof(last_inode_key))){ 293 last_inode_key = *INODE_PKEY(inode); 294 /* removal gets completed in iput */ 295 retval = 0; 296 } else { 297 reiserfs_warning(s, "super-2189", "Dead loop " 298 "in finish_unfinished " 299 "detected, just remove " 300 "save link\n"); 301 retval = remove_save_link_only(s, 302 &save_link_key, 0); 303 } 304 } 305 306 iput(inode); 307 printk("done\n"); 308 done++; 309 } 310 REISERFS_SB(s)->s_is_unlinked_ok = 0; 311 312#ifdef CONFIG_QUOTA 313 /* Turn quotas off */ 314 for (i = 0; i < MAXQUOTAS; i++) { 315 if (sb_dqopt(s)->files[i] && quota_enabled[i]) 316 dquot_quota_off(s, i); 317 } 318 if (ms_active_set) 319 /* Restore the flag back */ 320 s->s_flags &= ~MS_ACTIVE; 321#endif 322 pathrelse(&path); 323 if (done) 324 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. " 325 "Completed\n", done); 326 return retval; 327} 328 329/* to protect file being unlinked from getting lost we "safe" link files 330 being unlinked. This link will be deleted in the same transaction with last 331 item of file. mounting the filesystem we scan all these links and remove 332 files which almost got lost */ 333void add_save_link(struct reiserfs_transaction_handle *th, 334 struct inode *inode, int truncate) 335{ 336 INITIALIZE_PATH(path); 337 int retval; 338 struct cpu_key key; 339 struct item_head ih; 340 __le32 link; 341 342 BUG_ON(!th->t_trans_id); 343 344 /* file can only get one "save link" of each kind */ 345 RFALSE(truncate && 346 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask), 347 "saved link already exists for truncated inode %lx", 348 (long)inode->i_ino); 349 RFALSE(!truncate && 350 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask), 351 "saved link already exists for unlinked inode %lx", 352 (long)inode->i_ino); 353 354 /* setup key of "save" link */ 355 key.version = KEY_FORMAT_3_5; 356 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID; 357 key.on_disk_key.k_objectid = inode->i_ino; 358 if (!truncate) { 359 /* unlink, rmdir, rename */ 360 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize); 361 set_cpu_key_k_type(&key, TYPE_DIRECT); 362 363 /* item head of "safe" link */ 364 make_le_item_head(&ih, &key, key.version, 365 1 + inode->i_sb->s_blocksize, TYPE_DIRECT, 366 4 /*length */ , 0xffff /*free space */ ); 367 } else { 368 /* truncate */ 369 if (S_ISDIR(inode->i_mode)) 370 reiserfs_warning(inode->i_sb, "green-2102", 371 "Adding a truncate savelink for " 372 "a directory %k! Please report", 373 INODE_PKEY(inode)); 374 set_cpu_key_k_offset(&key, 1); 375 set_cpu_key_k_type(&key, TYPE_INDIRECT); 376 377 /* item head of "safe" link */ 378 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT, 379 4 /*length */ , 0 /*free space */ ); 380 } 381 key.key_length = 3; 382 383 /* look for its place in the tree */ 384 retval = search_item(inode->i_sb, &key, &path); 385 if (retval != ITEM_NOT_FOUND) { 386 if (retval != -ENOSPC) 387 reiserfs_error(inode->i_sb, "vs-2100", 388 "search_by_key (%K) returned %d", &key, 389 retval); 390 pathrelse(&path); 391 return; 392 } 393 394 /* body of "save" link */ 395 link = INODE_PKEY(inode)->k_dir_id; 396 397 /* put "save" link inot tree, don't charge quota to anyone */ 398 retval = 399 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link); 400 if (retval) { 401 if (retval != -ENOSPC) 402 reiserfs_error(inode->i_sb, "vs-2120", 403 "insert_item returned %d", retval); 404 } else { 405 if (truncate) 406 REISERFS_I(inode)->i_flags |= 407 i_link_saved_truncate_mask; 408 else 409 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask; 410 } 411} 412 413/* this opens transaction unlike add_save_link */ 414int remove_save_link(struct inode *inode, int truncate) 415{ 416 struct reiserfs_transaction_handle th; 417 struct reiserfs_key key; 418 int err; 419 420 /* we are going to do one balancing only */ 421 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT); 422 if (err) 423 return err; 424 425 /* setup key of "save" link */ 426 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID); 427 key.k_objectid = INODE_PKEY(inode)->k_objectid; 428 if (!truncate) { 429 /* unlink, rmdir, rename */ 430 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 431 1 + inode->i_sb->s_blocksize); 432 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT); 433 } else { 434 /* truncate */ 435 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1); 436 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT); 437 } 438 439 if ((truncate && 440 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) || 441 (!truncate && 442 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask))) 443 /* don't take quota bytes from anywhere */ 444 reiserfs_delete_solid_item(&th, NULL, &key); 445 if (!truncate) { 446 reiserfs_release_objectid(&th, inode->i_ino); 447 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask; 448 } else 449 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask; 450 451 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT); 452} 453 454static void reiserfs_kill_sb(struct super_block *s) 455{ 456 if (REISERFS_SB(s)) { 457 if (REISERFS_SB(s)->xattr_root) { 458 d_invalidate(REISERFS_SB(s)->xattr_root); 459 dput(REISERFS_SB(s)->xattr_root); 460 REISERFS_SB(s)->xattr_root = NULL; 461 } 462 if (REISERFS_SB(s)->priv_root) { 463 d_invalidate(REISERFS_SB(s)->priv_root); 464 dput(REISERFS_SB(s)->priv_root); 465 REISERFS_SB(s)->priv_root = NULL; 466 } 467 } 468 469 kill_block_super(s); 470} 471 472static void reiserfs_put_super(struct super_block *s) 473{ 474 struct reiserfs_transaction_handle th; 475 th.t_trans_id = 0; 476 477 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 478 479 reiserfs_write_lock(s); 480 481 if (s->s_dirt) 482 reiserfs_write_super(s); 483 484 /* change file system state to current state if it was mounted with read-write permissions */ 485 if (!(s->s_flags & MS_RDONLY)) { 486 if (!journal_begin(&th, s, 10)) { 487 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 488 1); 489 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s), 490 REISERFS_SB(s)->s_mount_state); 491 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s)); 492 } 493 } 494 495 /* note, journal_release checks for readonly mount, and can decide not 496 ** to do a journal_end 497 */ 498 journal_release(&th, s); 499 500 reiserfs_free_bitmap_cache(s); 501 502 brelse(SB_BUFFER_WITH_SB(s)); 503 504 print_statistics(s); 505 506 if (REISERFS_SB(s)->reserved_blocks != 0) { 507 reiserfs_warning(s, "green-2005", "reserved blocks left %d", 508 REISERFS_SB(s)->reserved_blocks); 509 } 510 511 reiserfs_proc_info_done(s); 512 513 reiserfs_write_unlock(s); 514 mutex_destroy(&REISERFS_SB(s)->lock); 515 kfree(s->s_fs_info); 516 s->s_fs_info = NULL; 517} 518 519static struct kmem_cache *reiserfs_inode_cachep; 520 521static struct inode *reiserfs_alloc_inode(struct super_block *sb) 522{ 523 struct reiserfs_inode_info *ei; 524 ei = (struct reiserfs_inode_info *) 525 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL); 526 if (!ei) 527 return NULL; 528 atomic_set(&ei->openers, 0); 529 mutex_init(&ei->tailpack); 530 return &ei->vfs_inode; 531} 532 533static void reiserfs_destroy_inode(struct inode *inode) 534{ 535 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode)); 536} 537 538static void init_once(void *foo) 539{ 540 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo; 541 542 INIT_LIST_HEAD(&ei->i_prealloc_list); 543 inode_init_once(&ei->vfs_inode); 544} 545 546static int init_inodecache(void) 547{ 548 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache", 549 sizeof(struct 550 reiserfs_inode_info), 551 0, (SLAB_RECLAIM_ACCOUNT| 552 SLAB_MEM_SPREAD), 553 init_once); 554 if (reiserfs_inode_cachep == NULL) 555 return -ENOMEM; 556 return 0; 557} 558 559static void destroy_inodecache(void) 560{ 561 kmem_cache_destroy(reiserfs_inode_cachep); 562} 563 564/* we don't mark inodes dirty, we just log them */ 565static void reiserfs_dirty_inode(struct inode *inode) 566{ 567 struct reiserfs_transaction_handle th; 568 569 int err = 0; 570 int lock_depth; 571 572 if (inode->i_sb->s_flags & MS_RDONLY) { 573 reiserfs_warning(inode->i_sb, "clm-6006", 574 "writing inode %lu on readonly FS", 575 inode->i_ino); 576 return; 577 } 578 lock_depth = reiserfs_write_lock_once(inode->i_sb); 579 580 /* this is really only used for atime updates, so they don't have 581 ** to be included in O_SYNC or fsync 582 */ 583 err = journal_begin(&th, inode->i_sb, 1); 584 if (err) 585 goto out; 586 587 reiserfs_update_sd(&th, inode); 588 journal_end(&th, inode->i_sb, 1); 589 590out: 591 reiserfs_write_unlock_once(inode->i_sb, lock_depth); 592} 593 594#ifdef CONFIG_QUOTA 595static ssize_t reiserfs_quota_write(struct super_block *, int, const char *, 596 size_t, loff_t); 597static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t, 598 loff_t); 599#endif 600 601static const struct super_operations reiserfs_sops = { 602 .alloc_inode = reiserfs_alloc_inode, 603 .destroy_inode = reiserfs_destroy_inode, 604 .write_inode = reiserfs_write_inode, 605 .dirty_inode = reiserfs_dirty_inode, 606 .evict_inode = reiserfs_evict_inode, 607 .put_super = reiserfs_put_super, 608 .write_super = reiserfs_write_super, 609 .sync_fs = reiserfs_sync_fs, 610 .freeze_fs = reiserfs_freeze, 611 .unfreeze_fs = reiserfs_unfreeze, 612 .statfs = reiserfs_statfs, 613 .remount_fs = reiserfs_remount, 614 .show_options = generic_show_options, 615#ifdef CONFIG_QUOTA 616 .quota_read = reiserfs_quota_read, 617 .quota_write = reiserfs_quota_write, 618#endif 619}; 620 621#ifdef CONFIG_QUOTA 622#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 623 624static int reiserfs_write_dquot(struct dquot *); 625static int reiserfs_acquire_dquot(struct dquot *); 626static int reiserfs_release_dquot(struct dquot *); 627static int reiserfs_mark_dquot_dirty(struct dquot *); 628static int reiserfs_write_info(struct super_block *, int); 629static int reiserfs_quota_on(struct super_block *, int, int, char *); 630 631static const struct dquot_operations reiserfs_quota_operations = { 632 .write_dquot = reiserfs_write_dquot, 633 .acquire_dquot = reiserfs_acquire_dquot, 634 .release_dquot = reiserfs_release_dquot, 635 .mark_dirty = reiserfs_mark_dquot_dirty, 636 .write_info = reiserfs_write_info, 637 .alloc_dquot = dquot_alloc, 638 .destroy_dquot = dquot_destroy, 639}; 640 641static const struct quotactl_ops reiserfs_qctl_operations = { 642 .quota_on = reiserfs_quota_on, 643 .quota_off = dquot_quota_off, 644 .quota_sync = dquot_quota_sync, 645 .get_info = dquot_get_dqinfo, 646 .set_info = dquot_set_dqinfo, 647 .get_dqblk = dquot_get_dqblk, 648 .set_dqblk = dquot_set_dqblk, 649}; 650#endif 651 652static const struct export_operations reiserfs_export_ops = { 653 .encode_fh = reiserfs_encode_fh, 654 .fh_to_dentry = reiserfs_fh_to_dentry, 655 .fh_to_parent = reiserfs_fh_to_parent, 656 .get_parent = reiserfs_get_parent, 657}; 658 659/* this struct is used in reiserfs_getopt () for containing the value for those 660 mount options that have values rather than being toggles. */ 661typedef struct { 662 char *value; 663 int setmask; /* bitmask which is to set on mount_options bitmask when this 664 value is found, 0 is no bits are to be changed. */ 665 int clrmask; /* bitmask which is to clear on mount_options bitmask when this 666 value is found, 0 is no bits are to be changed. This is 667 applied BEFORE setmask */ 668} arg_desc_t; 669 670/* Set this bit in arg_required to allow empty arguments */ 671#define REISERFS_OPT_ALLOWEMPTY 31 672 673/* this struct is used in reiserfs_getopt() for describing the set of reiserfs 674 mount options */ 675typedef struct { 676 char *option_name; 677 int arg_required; /* 0 if argument is not required, not 0 otherwise */ 678 const arg_desc_t *values; /* list of values accepted by an option */ 679 int setmask; /* bitmask which is to set on mount_options bitmask when this 680 value is found, 0 is no bits are to be changed. */ 681 int clrmask; /* bitmask which is to clear on mount_options bitmask when this 682 value is found, 0 is no bits are to be changed. This is 683 applied BEFORE setmask */ 684} opt_desc_t; 685 686/* possible values for -o data= */ 687static const arg_desc_t logging_mode[] = { 688 {"ordered", 1 << REISERFS_DATA_ORDERED, 689 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)}, 690 {"journal", 1 << REISERFS_DATA_LOG, 691 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)}, 692 {"writeback", 1 << REISERFS_DATA_WRITEBACK, 693 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)}, 694 {.value = NULL} 695}; 696 697/* possible values for -o barrier= */ 698static const arg_desc_t barrier_mode[] = { 699 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH}, 700 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE}, 701 {.value = NULL} 702}; 703 704/* possible values for "-o block-allocator=" and bits which are to be set in 705 s_mount_opt of reiserfs specific part of in-core super block */ 706static const arg_desc_t balloc[] = { 707 {"noborder", 1 << REISERFS_NO_BORDER, 0}, 708 {"border", 0, 1 << REISERFS_NO_BORDER}, 709 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0}, 710 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0}, 711 {"test4", 1 << REISERFS_TEST4, 0}, 712 {"notest4", 0, 1 << REISERFS_TEST4}, 713 {NULL, 0, 0} 714}; 715 716static const arg_desc_t tails[] = { 717 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL}, 718 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, 719 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL}, 720 {NULL, 0, 0} 721}; 722 723static const arg_desc_t error_actions[] = { 724 {"panic", 1 << REISERFS_ERROR_PANIC, 725 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)}, 726 {"ro-remount", 1 << REISERFS_ERROR_RO, 727 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)}, 728#ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG 729 {"continue", 1 << REISERFS_ERROR_CONTINUE, 730 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)}, 731#endif 732 {NULL, 0, 0}, 733}; 734 735/* proceed only one option from a list *cur - string containing of mount options 736 opts - array of options which are accepted 737 opt_arg - if option is found and requires an argument and if it is specifed 738 in the input - pointer to the argument is stored here 739 bit_flags - if option requires to set a certain bit - it is set here 740 return -1 if unknown option is found, opt->arg_required otherwise */ 741static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts, 742 char **opt_arg, unsigned long *bit_flags) 743{ 744 char *p; 745 /* foo=bar, 746 ^ ^ ^ 747 | | +-- option_end 748 | +-- arg_start 749 +-- option_start 750 */ 751 const opt_desc_t *opt; 752 const arg_desc_t *arg; 753 754 p = *cur; 755 756 /* assume argument cannot contain commas */ 757 *cur = strchr(p, ','); 758 if (*cur) { 759 *(*cur) = '\0'; 760 (*cur)++; 761 } 762 763 if (!strncmp(p, "alloc=", 6)) { 764 /* Ugly special case, probably we should redo options parser so that 765 it can understand several arguments for some options, also so that 766 it can fill several bitfields with option values. */ 767 if (reiserfs_parse_alloc_options(s, p + 6)) { 768 return -1; 769 } else { 770 return 0; 771 } 772 } 773 774 /* for every option in the list */ 775 for (opt = opts; opt->option_name; opt++) { 776 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) { 777 if (bit_flags) { 778 if (opt->clrmask == 779 (1 << REISERFS_UNSUPPORTED_OPT)) 780 reiserfs_warning(s, "super-6500", 781 "%s not supported.\n", 782 p); 783 else 784 *bit_flags &= ~opt->clrmask; 785 if (opt->setmask == 786 (1 << REISERFS_UNSUPPORTED_OPT)) 787 reiserfs_warning(s, "super-6501", 788 "%s not supported.\n", 789 p); 790 else 791 *bit_flags |= opt->setmask; 792 } 793 break; 794 } 795 } 796 if (!opt->option_name) { 797 reiserfs_warning(s, "super-6502", 798 "unknown mount option \"%s\"", p); 799 return -1; 800 } 801 802 p += strlen(opt->option_name); 803 switch (*p) { 804 case '=': 805 if (!opt->arg_required) { 806 reiserfs_warning(s, "super-6503", 807 "the option \"%s\" does not " 808 "require an argument\n", 809 opt->option_name); 810 return -1; 811 } 812 break; 813 814 case 0: 815 if (opt->arg_required) { 816 reiserfs_warning(s, "super-6504", 817 "the option \"%s\" requires an " 818 "argument\n", opt->option_name); 819 return -1; 820 } 821 break; 822 default: 823 reiserfs_warning(s, "super-6505", 824 "head of option \"%s\" is only correct\n", 825 opt->option_name); 826 return -1; 827 } 828 829 /* move to the argument, or to next option if argument is not required */ 830 p++; 831 832 if (opt->arg_required 833 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY)) 834 && !strlen(p)) { 835 /* this catches "option=," if not allowed */ 836 reiserfs_warning(s, "super-6506", 837 "empty argument for \"%s\"\n", 838 opt->option_name); 839 return -1; 840 } 841 842 if (!opt->values) { 843 /* *=NULLopt_arg contains pointer to argument */ 844 *opt_arg = p; 845 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY); 846 } 847 848 /* values possible for this option are listed in opt->values */ 849 for (arg = opt->values; arg->value; arg++) { 850 if (!strcmp(p, arg->value)) { 851 if (bit_flags) { 852 *bit_flags &= ~arg->clrmask; 853 *bit_flags |= arg->setmask; 854 } 855 return opt->arg_required; 856 } 857 } 858 859 reiserfs_warning(s, "super-6506", 860 "bad value \"%s\" for option \"%s\"\n", p, 861 opt->option_name); 862 return -1; 863} 864 865/* returns 0 if something is wrong in option string, 1 - otherwise */ 866static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */ 867 unsigned long *mount_options, 868 /* after the parsing phase, contains the 869 collection of bitflags defining what 870 mount options were selected. */ 871 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */ 872 char **jdev_name, 873 unsigned int *commit_max_age, 874 char **qf_names, 875 unsigned int *qfmt) 876{ 877 int c; 878 char *arg = NULL; 879 char *pos; 880 opt_desc_t opts[] = { 881 /* Compatibility stuff, so that -o notail for old setups still work */ 882 {"tails",.arg_required = 't',.values = tails}, 883 {"notail",.clrmask = 884 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)}, 885 {"conv",.setmask = 1 << REISERFS_CONVERT}, 886 {"attrs",.setmask = 1 << REISERFS_ATTRS}, 887 {"noattrs",.clrmask = 1 << REISERFS_ATTRS}, 888 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT}, 889#ifdef CONFIG_REISERFS_FS_XATTR 890 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER}, 891 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER}, 892#else 893 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, 894 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, 895#endif 896#ifdef CONFIG_REISERFS_FS_POSIX_ACL 897 {"acl",.setmask = 1 << REISERFS_POSIXACL}, 898 {"noacl",.clrmask = 1 << REISERFS_POSIXACL}, 899#else 900 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT}, 901 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT}, 902#endif 903 {.option_name = "nolog"}, 904 {"replayonly",.setmask = 1 << REPLAYONLY}, 905 {"block-allocator",.arg_required = 'a',.values = balloc}, 906 {"data",.arg_required = 'd',.values = logging_mode}, 907 {"barrier",.arg_required = 'b',.values = barrier_mode}, 908 {"resize",.arg_required = 'r',.values = NULL}, 909 {"jdev",.arg_required = 'j',.values = NULL}, 910 {"nolargeio",.arg_required = 'w',.values = NULL}, 911 {"commit",.arg_required = 'c',.values = NULL}, 912 {"usrquota",.setmask = 1 << REISERFS_QUOTA}, 913 {"grpquota",.setmask = 1 << REISERFS_QUOTA}, 914 {"noquota",.clrmask = 1 << REISERFS_QUOTA}, 915 {"errors",.arg_required = 'e',.values = error_actions}, 916 {"usrjquota",.arg_required = 917 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, 918 {"grpjquota",.arg_required = 919 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL}, 920 {"jqfmt",.arg_required = 'f',.values = NULL}, 921 {.option_name = NULL} 922 }; 923 924 *blocks = 0; 925 if (!options || !*options) 926 /* use default configuration: create tails, journaling on, no 927 conversion to newest format */ 928 return 1; 929 930 for (pos = options; pos;) { 931 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options); 932 if (c == -1) 933 /* wrong option is given */ 934 return 0; 935 936 if (c == 'r') { 937 char *p; 938 939 p = NULL; 940 /* "resize=NNN" or "resize=auto" */ 941 942 if (!strcmp(arg, "auto")) { 943 /* From JFS code, to auto-get the size. */ 944 *blocks = 945 s->s_bdev->bd_inode->i_size >> s-> 946 s_blocksize_bits; 947 } else { 948 *blocks = simple_strtoul(arg, &p, 0); 949 if (*p != '\0') { 950 /* NNN does not look like a number */ 951 reiserfs_warning(s, "super-6507", 952 "bad value %s for " 953 "-oresize\n", arg); 954 return 0; 955 } 956 } 957 } 958 959 if (c == 'c') { 960 char *p = NULL; 961 unsigned long val = simple_strtoul(arg, &p, 0); 962 /* commit=NNN (time in seconds) */ 963 if (*p != '\0' || val >= (unsigned int)-1) { 964 reiserfs_warning(s, "super-6508", 965 "bad value %s for -ocommit\n", 966 arg); 967 return 0; 968 } 969 *commit_max_age = (unsigned int)val; 970 } 971 972 if (c == 'w') { 973 reiserfs_warning(s, "super-6509", "nolargeio option " 974 "is no longer supported"); 975 return 0; 976 } 977 978 if (c == 'j') { 979 if (arg && *arg && jdev_name) { 980 if (*jdev_name) { //Hm, already assigned? 981 reiserfs_warning(s, "super-6510", 982 "journal device was " 983 "already specified to " 984 "be %s", *jdev_name); 985 return 0; 986 } 987 *jdev_name = arg; 988 } 989 } 990#ifdef CONFIG_QUOTA 991 if (c == 'u' || c == 'g') { 992 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA; 993 994 if (sb_any_quota_loaded(s) && 995 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) { 996 reiserfs_warning(s, "super-6511", 997 "cannot change journaled " 998 "quota options when quota " 999 "turned on."); 1000 return 0; 1001 } 1002 if (*arg) { /* Some filename specified? */ 1003 if (REISERFS_SB(s)->s_qf_names[qtype] 1004 && strcmp(REISERFS_SB(s)->s_qf_names[qtype], 1005 arg)) { 1006 reiserfs_warning(s, "super-6512", 1007 "%s quota file " 1008 "already specified.", 1009 QTYPE2NAME(qtype)); 1010 return 0; 1011 } 1012 if (strchr(arg, '/')) { 1013 reiserfs_warning(s, "super-6513", 1014 "quotafile must be " 1015 "on filesystem root."); 1016 return 0; 1017 } 1018 qf_names[qtype] = 1019 kmalloc(strlen(arg) + 1, GFP_KERNEL); 1020 if (!qf_names[qtype]) { 1021 reiserfs_warning(s, "reiserfs-2502", 1022 "not enough memory " 1023 "for storing " 1024 "quotafile name."); 1025 return 0; 1026 } 1027 strcpy(qf_names[qtype], arg); 1028 *mount_options |= 1 << REISERFS_QUOTA; 1029 } else { 1030 if (qf_names[qtype] != 1031 REISERFS_SB(s)->s_qf_names[qtype]) 1032 kfree(qf_names[qtype]); 1033 qf_names[qtype] = NULL; 1034 } 1035 } 1036 if (c == 'f') { 1037 if (!strcmp(arg, "vfsold")) 1038 *qfmt = QFMT_VFS_OLD; 1039 else if (!strcmp(arg, "vfsv0")) 1040 *qfmt = QFMT_VFS_V0; 1041 else { 1042 reiserfs_warning(s, "super-6514", 1043 "unknown quota format " 1044 "specified."); 1045 return 0; 1046 } 1047 if (sb_any_quota_loaded(s) && 1048 *qfmt != REISERFS_SB(s)->s_jquota_fmt) { 1049 reiserfs_warning(s, "super-6515", 1050 "cannot change journaled " 1051 "quota options when quota " 1052 "turned on."); 1053 return 0; 1054 } 1055 } 1056#else 1057 if (c == 'u' || c == 'g' || c == 'f') { 1058 reiserfs_warning(s, "reiserfs-2503", "journaled " 1059 "quota options not supported."); 1060 return 0; 1061 } 1062#endif 1063 } 1064 1065#ifdef CONFIG_QUOTA 1066 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt 1067 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) { 1068 reiserfs_warning(s, "super-6515", 1069 "journaled quota format not specified."); 1070 return 0; 1071 } 1072 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */ 1073 if (!(*mount_options & (1 << REISERFS_QUOTA)) 1074 && sb_any_quota_loaded(s)) { 1075 reiserfs_warning(s, "super-6516", "quota options must " 1076 "be present when quota is turned on."); 1077 return 0; 1078 } 1079#endif 1080 1081 return 1; 1082} 1083 1084static void switch_data_mode(struct super_block *s, unsigned long mode) 1085{ 1086 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) | 1087 (1 << REISERFS_DATA_ORDERED) | 1088 (1 << REISERFS_DATA_WRITEBACK)); 1089 REISERFS_SB(s)->s_mount_opt |= (1 << mode); 1090} 1091 1092static void handle_data_mode(struct super_block *s, unsigned long mount_options) 1093{ 1094 if (mount_options & (1 << REISERFS_DATA_LOG)) { 1095 if (!reiserfs_data_log(s)) { 1096 switch_data_mode(s, REISERFS_DATA_LOG); 1097 reiserfs_info(s, "switching to journaled data mode\n"); 1098 } 1099 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) { 1100 if (!reiserfs_data_ordered(s)) { 1101 switch_data_mode(s, REISERFS_DATA_ORDERED); 1102 reiserfs_info(s, "switching to ordered data mode\n"); 1103 } 1104 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) { 1105 if (!reiserfs_data_writeback(s)) { 1106 switch_data_mode(s, REISERFS_DATA_WRITEBACK); 1107 reiserfs_info(s, "switching to writeback data mode\n"); 1108 } 1109 } 1110} 1111 1112static void handle_barrier_mode(struct super_block *s, unsigned long bits) 1113{ 1114 int flush = (1 << REISERFS_BARRIER_FLUSH); 1115 int none = (1 << REISERFS_BARRIER_NONE); 1116 int all_barrier = flush | none; 1117 1118 if (bits & all_barrier) { 1119 REISERFS_SB(s)->s_mount_opt &= ~all_barrier; 1120 if (bits & flush) { 1121 REISERFS_SB(s)->s_mount_opt |= flush; 1122 printk("reiserfs: enabling write barrier flush mode\n"); 1123 } else if (bits & none) { 1124 REISERFS_SB(s)->s_mount_opt |= none; 1125 printk("reiserfs: write barriers turned off\n"); 1126 } 1127 } 1128} 1129 1130static void handle_attrs(struct super_block *s) 1131{ 1132 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s); 1133 1134 if (reiserfs_attrs(s)) { 1135 if (old_format_only(s)) { 1136 reiserfs_warning(s, "super-6517", "cannot support " 1137 "attributes on 3.5.x disk format"); 1138 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); 1139 return; 1140 } 1141 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) { 1142 reiserfs_warning(s, "super-6518", "cannot support " 1143 "attributes until flag is set in " 1144 "super-block"); 1145 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS); 1146 } 1147 } 1148} 1149 1150#ifdef CONFIG_QUOTA 1151static void handle_quota_files(struct super_block *s, char **qf_names, 1152 unsigned int *qfmt) 1153{ 1154 int i; 1155 1156 for (i = 0; i < MAXQUOTAS; i++) { 1157 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) 1158 kfree(REISERFS_SB(s)->s_qf_names[i]); 1159 REISERFS_SB(s)->s_qf_names[i] = qf_names[i]; 1160 } 1161 REISERFS_SB(s)->s_jquota_fmt = *qfmt; 1162} 1163#endif 1164 1165static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg) 1166{ 1167 struct reiserfs_super_block *rs; 1168 struct reiserfs_transaction_handle th; 1169 unsigned long blocks; 1170 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt; 1171 unsigned long safe_mask = 0; 1172 unsigned int commit_max_age = (unsigned int)-1; 1173 struct reiserfs_journal *journal = SB_JOURNAL(s); 1174 char *new_opts = kstrdup(arg, GFP_KERNEL); 1175 int err; 1176 char *qf_names[MAXQUOTAS]; 1177 unsigned int qfmt = 0; 1178#ifdef CONFIG_QUOTA 1179 int i; 1180#endif 1181 1182 reiserfs_write_lock(s); 1183 1184#ifdef CONFIG_QUOTA 1185 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names)); 1186#endif 1187 1188 rs = SB_DISK_SUPER_BLOCK(s); 1189 1190 if (!reiserfs_parse_options 1191 (s, arg, &mount_options, &blocks, NULL, &commit_max_age, 1192 qf_names, &qfmt)) { 1193#ifdef CONFIG_QUOTA 1194 for (i = 0; i < MAXQUOTAS; i++) 1195 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i]) 1196 kfree(qf_names[i]); 1197#endif 1198 err = -EINVAL; 1199 goto out_err; 1200 } 1201#ifdef CONFIG_QUOTA 1202 handle_quota_files(s, qf_names, &qfmt); 1203#endif 1204 1205 handle_attrs(s); 1206 1207 /* Add options that are safe here */ 1208 safe_mask |= 1 << REISERFS_SMALLTAIL; 1209 safe_mask |= 1 << REISERFS_LARGETAIL; 1210 safe_mask |= 1 << REISERFS_NO_BORDER; 1211 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION; 1212 safe_mask |= 1 << REISERFS_HASHED_RELOCATION; 1213 safe_mask |= 1 << REISERFS_TEST4; 1214 safe_mask |= 1 << REISERFS_ATTRS; 1215 safe_mask |= 1 << REISERFS_XATTRS_USER; 1216 safe_mask |= 1 << REISERFS_POSIXACL; 1217 safe_mask |= 1 << REISERFS_BARRIER_FLUSH; 1218 safe_mask |= 1 << REISERFS_BARRIER_NONE; 1219 safe_mask |= 1 << REISERFS_ERROR_RO; 1220 safe_mask |= 1 << REISERFS_ERROR_CONTINUE; 1221 safe_mask |= 1 << REISERFS_ERROR_PANIC; 1222 safe_mask |= 1 << REISERFS_QUOTA; 1223 1224 /* Update the bitmask, taking care to keep 1225 * the bits we're not allowed to change here */ 1226 REISERFS_SB(s)->s_mount_opt = 1227 (REISERFS_SB(s)-> 1228 s_mount_opt & ~safe_mask) | (mount_options & safe_mask); 1229 1230 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) { 1231 journal->j_max_commit_age = commit_max_age; 1232 journal->j_max_trans_age = commit_max_age; 1233 } else if (commit_max_age == 0) { 1234 /* 0 means restore defaults. */ 1235 journal->j_max_commit_age = journal->j_default_max_commit_age; 1236 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; 1237 } 1238 1239 if (blocks) { 1240 err = reiserfs_resize(s, blocks); 1241 if (err != 0) 1242 goto out_err; 1243 } 1244 1245 if (*mount_flags & MS_RDONLY) { 1246 reiserfs_xattr_init(s, *mount_flags); 1247 /* remount read-only */ 1248 if (s->s_flags & MS_RDONLY) 1249 /* it is read-only already */ 1250 goto out_ok; 1251 1252 err = dquot_suspend(s, -1); 1253 if (err < 0) 1254 goto out_err; 1255 1256 /* try to remount file system with read-only permissions */ 1257 if (sb_umount_state(rs) == REISERFS_VALID_FS 1258 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) { 1259 goto out_ok; 1260 } 1261 1262 err = journal_begin(&th, s, 10); 1263 if (err) 1264 goto out_err; 1265 1266 /* Mounting a rw partition read-only. */ 1267 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 1268 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state); 1269 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s)); 1270 } else { 1271 /* remount read-write */ 1272 if (!(s->s_flags & MS_RDONLY)) { 1273 reiserfs_xattr_init(s, *mount_flags); 1274 goto out_ok; /* We are read-write already */ 1275 } 1276 1277 if (reiserfs_is_journal_aborted(journal)) { 1278 err = journal->j_errno; 1279 goto out_err; 1280 } 1281 1282 handle_data_mode(s, mount_options); 1283 handle_barrier_mode(s, mount_options); 1284 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); 1285 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */ 1286 err = journal_begin(&th, s, 10); 1287 if (err) 1288 goto out_err; 1289 1290 /* Mount a partition which is read-only, read-write */ 1291 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 1292 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs); 1293 s->s_flags &= ~MS_RDONLY; 1294 set_sb_umount_state(rs, REISERFS_ERROR_FS); 1295 if (!old_format_only(s)) 1296 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); 1297 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */ 1298 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s)); 1299 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS; 1300 } 1301 /* this will force a full flush of all journal lists */ 1302 SB_JOURNAL(s)->j_must_wait = 1; 1303 err = journal_end(&th, s, 10); 1304 if (err) 1305 goto out_err; 1306 s->s_dirt = 0; 1307 1308 if (!(*mount_flags & MS_RDONLY)) { 1309 dquot_resume(s, -1); 1310 finish_unfinished(s); 1311 reiserfs_xattr_init(s, *mount_flags); 1312 } 1313 1314out_ok: 1315 replace_mount_options(s, new_opts); 1316 reiserfs_write_unlock(s); 1317 return 0; 1318 1319out_err: 1320 kfree(new_opts); 1321 reiserfs_write_unlock(s); 1322 return err; 1323} 1324 1325static int read_super_block(struct super_block *s, int offset) 1326{ 1327 struct buffer_head *bh; 1328 struct reiserfs_super_block *rs; 1329 int fs_blocksize; 1330 1331 bh = sb_bread(s, offset / s->s_blocksize); 1332 if (!bh) { 1333 reiserfs_warning(s, "sh-2006", 1334 "bread failed (dev %s, block %lu, size %lu)", 1335 reiserfs_bdevname(s), offset / s->s_blocksize, 1336 s->s_blocksize); 1337 return 1; 1338 } 1339 1340 rs = (struct reiserfs_super_block *)bh->b_data; 1341 if (!is_any_reiserfs_magic_string(rs)) { 1342 brelse(bh); 1343 return 1; 1344 } 1345 // 1346 // ok, reiserfs signature (old or new) found in at the given offset 1347 // 1348 fs_blocksize = sb_blocksize(rs); 1349 brelse(bh); 1350 sb_set_blocksize(s, fs_blocksize); 1351 1352 bh = sb_bread(s, offset / s->s_blocksize); 1353 if (!bh) { 1354 reiserfs_warning(s, "sh-2007", 1355 "bread failed (dev %s, block %lu, size %lu)", 1356 reiserfs_bdevname(s), offset / s->s_blocksize, 1357 s->s_blocksize); 1358 return 1; 1359 } 1360 1361 rs = (struct reiserfs_super_block *)bh->b_data; 1362 if (sb_blocksize(rs) != s->s_blocksize) { 1363 reiserfs_warning(s, "sh-2011", "can't find a reiserfs " 1364 "filesystem on (dev %s, block %Lu, size %lu)", 1365 reiserfs_bdevname(s), 1366 (unsigned long long)bh->b_blocknr, 1367 s->s_blocksize); 1368 brelse(bh); 1369 return 1; 1370 } 1371 1372 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) { 1373 brelse(bh); 1374 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck " 1375 "--rebuild-tree run detected. Please run\n" 1376 "reiserfsck --rebuild-tree and wait for a " 1377 "completion. If that fails\n" 1378 "get newer reiserfsprogs package"); 1379 return 1; 1380 } 1381 1382 SB_BUFFER_WITH_SB(s) = bh; 1383 SB_DISK_SUPER_BLOCK(s) = rs; 1384 1385 if (is_reiserfs_jr(rs)) { 1386 /* magic is of non-standard journal filesystem, look at s_version to 1387 find which format is in use */ 1388 if (sb_version(rs) == REISERFS_VERSION_2) 1389 reiserfs_info(s, "found reiserfs format \"3.6\"" 1390 " with non-standard journal\n"); 1391 else if (sb_version(rs) == REISERFS_VERSION_1) 1392 reiserfs_info(s, "found reiserfs format \"3.5\"" 1393 " with non-standard journal\n"); 1394 else { 1395 reiserfs_warning(s, "sh-2012", "found unknown " 1396 "format \"%u\" of reiserfs with " 1397 "non-standard magic", sb_version(rs)); 1398 return 1; 1399 } 1400 } else 1401 /* s_version of standard format may contain incorrect information, 1402 so we just look at the magic string */ 1403 reiserfs_info(s, 1404 "found reiserfs format \"%s\" with standard journal\n", 1405 is_reiserfs_3_5(rs) ? "3.5" : "3.6"); 1406 1407 s->s_op = &reiserfs_sops; 1408 s->s_export_op = &reiserfs_export_ops; 1409#ifdef CONFIG_QUOTA 1410 s->s_qcop = &reiserfs_qctl_operations; 1411 s->dq_op = &reiserfs_quota_operations; 1412#endif 1413 1414 /* new format is limited by the 32 bit wide i_blocks field, want to 1415 ** be one full block below that. 1416 */ 1417 s->s_maxbytes = (512LL << 32) - s->s_blocksize; 1418 return 0; 1419} 1420 1421/* after journal replay, reread all bitmap and super blocks */ 1422static int reread_meta_blocks(struct super_block *s) 1423{ 1424 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s))); 1425 reiserfs_write_unlock(s); 1426 wait_on_buffer(SB_BUFFER_WITH_SB(s)); 1427 reiserfs_write_lock(s); 1428 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) { 1429 reiserfs_warning(s, "reiserfs-2504", "error reading the super"); 1430 return 1; 1431 } 1432 1433 return 0; 1434} 1435 1436///////////////////////////////////////////////////// 1437// hash detection stuff 1438 1439// if root directory is empty - we set default - Yura's - hash and 1440// warn about it 1441// bith have the same value - we ask user to send report to the 1442// mailing list 1443static __u32 find_hash_out(struct super_block *s) 1444{ 1445 int retval; 1446 struct inode *inode; 1447 struct cpu_key key; 1448 INITIALIZE_PATH(path); 1449 struct reiserfs_dir_entry de; 1450 __u32 hash = DEFAULT_HASH; 1451 1452 inode = s->s_root->d_inode; 1453 1454 do { // Some serious "goto"-hater was there ;) 1455 u32 teahash, r5hash, yurahash; 1456 1457 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3); 1458 retval = search_by_entry_key(s, &key, &path, &de); 1459 if (retval == IO_ERROR) { 1460 pathrelse(&path); 1461 return UNSET_HASH; 1462 } 1463 if (retval == NAME_NOT_FOUND) 1464 de.de_entry_num--; 1465 set_de_name_and_namelen(&de); 1466 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) { 1467 /* allow override in this case */ 1468 if (reiserfs_rupasov_hash(s)) { 1469 hash = YURA_HASH; 1470 } 1471 reiserfs_info(s, "FS seems to be empty, autodetect " 1472 "is using the default hash\n"); 1473 break; 1474 } 1475 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen)); 1476 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen)); 1477 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen)); 1478 if (((teahash == r5hash) 1479 && 1480 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) 1481 == r5hash)) || ((teahash == yurahash) 1482 && (yurahash == 1483 GET_HASH_VALUE(deh_offset 1484 (& 1485 (de. 1486 de_deh[de. 1487 de_entry_num]))))) 1488 || ((r5hash == yurahash) 1489 && (yurahash == 1490 GET_HASH_VALUE(deh_offset 1491 (&(de.de_deh[de.de_entry_num])))))) { 1492 reiserfs_warning(s, "reiserfs-2506", "Unable to " 1493 "automatically detect hash function. " 1494 "Please mount with -o " 1495 "hash={tea,rupasov,r5}"); 1496 hash = UNSET_HASH; 1497 break; 1498 } 1499 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) == 1500 yurahash) 1501 hash = YURA_HASH; 1502 else if (GET_HASH_VALUE 1503 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash) 1504 hash = TEA_HASH; 1505 else if (GET_HASH_VALUE 1506 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash) 1507 hash = R5_HASH; 1508 else { 1509 reiserfs_warning(s, "reiserfs-2506", 1510 "Unrecognised hash function"); 1511 hash = UNSET_HASH; 1512 } 1513 } while (0); 1514 1515 pathrelse(&path); 1516 return hash; 1517} 1518 1519// finds out which hash names are sorted with 1520static int what_hash(struct super_block *s) 1521{ 1522 __u32 code; 1523 1524 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s)); 1525 1526 /* reiserfs_hash_detect() == true if any of the hash mount options 1527 ** were used. We must check them to make sure the user isn't 1528 ** using a bad hash value 1529 */ 1530 if (code == UNSET_HASH || reiserfs_hash_detect(s)) 1531 code = find_hash_out(s); 1532 1533 if (code != UNSET_HASH && reiserfs_hash_detect(s)) { 1534 /* detection has found the hash, and we must check against the 1535 ** mount options 1536 */ 1537 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) { 1538 reiserfs_warning(s, "reiserfs-2507", 1539 "Error, %s hash detected, " 1540 "unable to force rupasov hash", 1541 reiserfs_hashname(code)); 1542 code = UNSET_HASH; 1543 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) { 1544 reiserfs_warning(s, "reiserfs-2508", 1545 "Error, %s hash detected, " 1546 "unable to force tea hash", 1547 reiserfs_hashname(code)); 1548 code = UNSET_HASH; 1549 } else if (reiserfs_r5_hash(s) && code != R5_HASH) { 1550 reiserfs_warning(s, "reiserfs-2509", 1551 "Error, %s hash detected, " 1552 "unable to force r5 hash", 1553 reiserfs_hashname(code)); 1554 code = UNSET_HASH; 1555 } 1556 } else { 1557 /* find_hash_out was not called or could not determine the hash */ 1558 if (reiserfs_rupasov_hash(s)) { 1559 code = YURA_HASH; 1560 } else if (reiserfs_tea_hash(s)) { 1561 code = TEA_HASH; 1562 } else if (reiserfs_r5_hash(s)) { 1563 code = R5_HASH; 1564 } 1565 } 1566 1567 /* if we are mounted RW, and we have a new valid hash code, update 1568 ** the super 1569 */ 1570 if (code != UNSET_HASH && 1571 !(s->s_flags & MS_RDONLY) && 1572 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) { 1573 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code); 1574 } 1575 return code; 1576} 1577 1578// return pointer to appropriate function 1579static hashf_t hash_function(struct super_block *s) 1580{ 1581 switch (what_hash(s)) { 1582 case TEA_HASH: 1583 reiserfs_info(s, "Using tea hash to sort names\n"); 1584 return keyed_hash; 1585 case YURA_HASH: 1586 reiserfs_info(s, "Using rupasov hash to sort names\n"); 1587 return yura_hash; 1588 case R5_HASH: 1589 reiserfs_info(s, "Using r5 hash to sort names\n"); 1590 return r5_hash; 1591 } 1592 return NULL; 1593} 1594 1595// this is used to set up correct value for old partitions 1596static int function2code(hashf_t func) 1597{ 1598 if (func == keyed_hash) 1599 return TEA_HASH; 1600 if (func == yura_hash) 1601 return YURA_HASH; 1602 if (func == r5_hash) 1603 return R5_HASH; 1604 1605 BUG(); // should never happen 1606 1607 return 0; 1608} 1609 1610#define SWARN(silent, s, id, ...) \ 1611 if (!(silent)) \ 1612 reiserfs_warning(s, id, __VA_ARGS__) 1613 1614static int reiserfs_fill_super(struct super_block *s, void *data, int silent) 1615{ 1616 struct inode *root_inode; 1617 struct reiserfs_transaction_handle th; 1618 int old_format = 0; 1619 unsigned long blocks; 1620 unsigned int commit_max_age = 0; 1621 int jinit_done = 0; 1622 struct reiserfs_iget_args args; 1623 struct reiserfs_super_block *rs; 1624 char *jdev_name; 1625 struct reiserfs_sb_info *sbi; 1626 int errval = -EINVAL; 1627 char *qf_names[MAXQUOTAS] = {}; 1628 unsigned int qfmt = 0; 1629 1630 save_mount_options(s, data); 1631 1632 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL); 1633 if (!sbi) 1634 return -ENOMEM; 1635 s->s_fs_info = sbi; 1636 /* Set default values for options: non-aggressive tails, RO on errors */ 1637 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL); 1638 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO); 1639 /* no preallocation minimum, be smart in 1640 reiserfs_file_write instead */ 1641 REISERFS_SB(s)->s_alloc_options.preallocmin = 0; 1642 /* Preallocate by 16 blocks (17-1) at once */ 1643 REISERFS_SB(s)->s_alloc_options.preallocsize = 17; 1644 /* setup default block allocator options */ 1645 reiserfs_init_alloc_options(s); 1646 1647 mutex_init(&REISERFS_SB(s)->lock); 1648 REISERFS_SB(s)->lock_depth = -1; 1649 1650 /* 1651 * This function is called with the bkl, which also was the old 1652 * locking used here. 1653 * do_journal_begin() will soon check if we hold the lock (ie: was the 1654 * bkl). This is likely because do_journal_begin() has several another 1655 * callers because at this time, it doesn't seem to be necessary to 1656 * protect against anything. 1657 * Anyway, let's be conservative and lock for now. 1658 */ 1659 reiserfs_write_lock(s); 1660 1661 jdev_name = NULL; 1662 if (reiserfs_parse_options 1663 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name, 1664 &commit_max_age, qf_names, &qfmt) == 0) { 1665 goto error; 1666 } 1667#ifdef CONFIG_QUOTA 1668 handle_quota_files(s, qf_names, &qfmt); 1669#endif 1670 1671 if (blocks) { 1672 SWARN(silent, s, "jmacd-7", "resize option for remount only"); 1673 goto error; 1674 } 1675 1676 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */ 1677 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES)) 1678 old_format = 1; 1679 /* try new format (64-th 1k block), which can contain reiserfs super block */ 1680 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) { 1681 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s", 1682 reiserfs_bdevname(s)); 1683 goto error; 1684 } 1685 1686 rs = SB_DISK_SUPER_BLOCK(s); 1687 /* Let's do basic sanity check to verify that underlying device is not 1688 smaller than the filesystem. If the check fails then abort and scream, 1689 because bad stuff will happen otherwise. */ 1690 if (s->s_bdev && s->s_bdev->bd_inode 1691 && i_size_read(s->s_bdev->bd_inode) < 1692 sb_block_count(rs) * sb_blocksize(rs)) { 1693 SWARN(silent, s, "", "Filesystem cannot be " 1694 "mounted because it is bigger than the device"); 1695 SWARN(silent, s, "", "You may need to run fsck " 1696 "or increase size of your LVM partition"); 1697 SWARN(silent, s, "", "Or may be you forgot to " 1698 "reboot after fdisk when it told you to"); 1699 goto error; 1700 } 1701 1702 sbi->s_mount_state = SB_REISERFS_STATE(s); 1703 sbi->s_mount_state = REISERFS_VALID_FS; 1704 1705 if ((errval = reiserfs_init_bitmap_cache(s))) { 1706 SWARN(silent, s, "jmacd-8", "unable to read bitmap"); 1707 goto error; 1708 } 1709 errval = -EINVAL; 1710#ifdef CONFIG_REISERFS_CHECK 1711 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON"); 1712 SWARN(silent, s, "", "- it is slow mode for debugging."); 1713#endif 1714 1715 /* make data=ordered the default */ 1716 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) && 1717 !reiserfs_data_writeback(s)) { 1718 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED); 1719 } 1720 1721 if (reiserfs_data_log(s)) { 1722 reiserfs_info(s, "using journaled data mode\n"); 1723 } else if (reiserfs_data_ordered(s)) { 1724 reiserfs_info(s, "using ordered data mode\n"); 1725 } else { 1726 reiserfs_info(s, "using writeback data mode\n"); 1727 } 1728 if (reiserfs_barrier_flush(s)) { 1729 printk("reiserfs: using flush barriers\n"); 1730 } 1731 // set_device_ro(s->s_dev, 1) ; 1732 if (journal_init(s, jdev_name, old_format, commit_max_age)) { 1733 SWARN(silent, s, "sh-2022", 1734 "unable to initialize journal space"); 1735 goto error; 1736 } else { 1737 jinit_done = 1; /* once this is set, journal_release must be called 1738 ** if we error out of the mount 1739 */ 1740 } 1741 if (reread_meta_blocks(s)) { 1742 SWARN(silent, s, "jmacd-9", 1743 "unable to reread meta blocks after journal init"); 1744 goto error; 1745 } 1746 1747 if (replay_only(s)) 1748 goto error; 1749 1750 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) { 1751 SWARN(silent, s, "clm-7000", 1752 "Detected readonly device, marking FS readonly"); 1753 s->s_flags |= MS_RDONLY; 1754 } 1755 args.objectid = REISERFS_ROOT_OBJECTID; 1756 args.dirid = REISERFS_ROOT_PARENT_OBJECTID; 1757 root_inode = 1758 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor, 1759 reiserfs_init_locked_inode, (void *)(&args)); 1760 if (!root_inode) { 1761 SWARN(silent, s, "jmacd-10", "get root inode failed"); 1762 goto error; 1763 } 1764 1765 if (root_inode->i_state & I_NEW) { 1766 reiserfs_read_locked_inode(root_inode, &args); 1767 unlock_new_inode(root_inode); 1768 } 1769 1770 s->s_root = d_alloc_root(root_inode); 1771 if (!s->s_root) { 1772 iput(root_inode); 1773 goto error; 1774 } 1775 // define and initialize hash function 1776 sbi->s_hash_function = hash_function(s); 1777 if (sbi->s_hash_function == NULL) { 1778 dput(s->s_root); 1779 s->s_root = NULL; 1780 goto error; 1781 } 1782 1783 if (is_reiserfs_3_5(rs) 1784 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1)) 1785 set_bit(REISERFS_3_5, &(sbi->s_properties)); 1786 else if (old_format) 1787 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties)); 1788 else 1789 set_bit(REISERFS_3_6, &(sbi->s_properties)); 1790 1791 if (!(s->s_flags & MS_RDONLY)) { 1792 1793 errval = journal_begin(&th, s, 1); 1794 if (errval) { 1795 dput(s->s_root); 1796 s->s_root = NULL; 1797 goto error; 1798 } 1799 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); 1800 1801 set_sb_umount_state(rs, REISERFS_ERROR_FS); 1802 set_sb_fs_state(rs, 0); 1803 1804 /* Clear out s_bmap_nr if it would wrap. We can handle this 1805 * case, but older revisions can't. This will cause the 1806 * file system to fail mount on those older implementations, 1807 * avoiding corruption. -jeffm */ 1808 if (bmap_would_wrap(reiserfs_bmap_count(s)) && 1809 sb_bmap_nr(rs) != 0) { 1810 reiserfs_warning(s, "super-2030", "This file system " 1811 "claims to use %u bitmap blocks in " 1812 "its super block, but requires %u. " 1813 "Clearing to zero.", sb_bmap_nr(rs), 1814 reiserfs_bmap_count(s)); 1815 1816 set_sb_bmap_nr(rs, 0); 1817 } 1818 1819 if (old_format_only(s)) { 1820 /* filesystem of format 3.5 either with standard or non-standard 1821 journal */ 1822 if (convert_reiserfs(s)) { 1823 /* and -o conv is given */ 1824 if (!silent) 1825 reiserfs_info(s, 1826 "converting 3.5 filesystem to the 3.6 format"); 1827 1828 if (is_reiserfs_3_5(rs)) 1829 /* put magic string of 3.6 format. 2.2 will not be able to 1830 mount this filesystem anymore */ 1831 memcpy(rs->s_v1.s_magic, 1832 reiserfs_3_6_magic_string, 1833 sizeof 1834 (reiserfs_3_6_magic_string)); 1835 1836 set_sb_version(rs, REISERFS_VERSION_2); 1837 reiserfs_convert_objectid_map_v1(s); 1838 set_bit(REISERFS_3_6, &(sbi->s_properties)); 1839 clear_bit(REISERFS_3_5, &(sbi->s_properties)); 1840 } else if (!silent) { 1841 reiserfs_info(s, "using 3.5.x disk format\n"); 1842 } 1843 } else 1844 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1); 1845 1846 1847 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s)); 1848 errval = journal_end(&th, s, 1); 1849 if (errval) { 1850 dput(s->s_root); 1851 s->s_root = NULL; 1852 goto error; 1853 } 1854 1855 if ((errval = reiserfs_lookup_privroot(s)) || 1856 (errval = reiserfs_xattr_init(s, s->s_flags))) { 1857 dput(s->s_root); 1858 s->s_root = NULL; 1859 goto error; 1860 } 1861 1862 /* look for files which were to be removed in previous session */ 1863 finish_unfinished(s); 1864 } else { 1865 if (old_format_only(s) && !silent) { 1866 reiserfs_info(s, "using 3.5.x disk format\n"); 1867 } 1868 1869 if ((errval = reiserfs_lookup_privroot(s)) || 1870 (errval = reiserfs_xattr_init(s, s->s_flags))) { 1871 dput(s->s_root); 1872 s->s_root = NULL; 1873 goto error; 1874 } 1875 } 1876 // mark hash in super block: it could be unset. overwrite should be ok 1877 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function)); 1878 1879 handle_attrs(s); 1880 1881 reiserfs_proc_info_init(s); 1882 1883 init_waitqueue_head(&(sbi->s_wait)); 1884 spin_lock_init(&sbi->bitmap_lock); 1885 1886 reiserfs_write_unlock(s); 1887 1888 return (0); 1889 1890error: 1891 if (jinit_done) { /* kill the commit thread, free journal ram */ 1892 journal_release_error(NULL, s); 1893 } 1894 1895 reiserfs_write_unlock(s); 1896 1897 reiserfs_free_bitmap_cache(s); 1898 if (SB_BUFFER_WITH_SB(s)) 1899 brelse(SB_BUFFER_WITH_SB(s)); 1900#ifdef CONFIG_QUOTA 1901 { 1902 int j; 1903 for (j = 0; j < MAXQUOTAS; j++) 1904 kfree(qf_names[j]); 1905 } 1906#endif 1907 kfree(sbi); 1908 1909 s->s_fs_info = NULL; 1910 return errval; 1911} 1912 1913static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf) 1914{ 1915 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb); 1916 1917 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize)); 1918 buf->f_bfree = sb_free_blocks(rs); 1919 buf->f_bavail = buf->f_bfree; 1920 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1; 1921 buf->f_bsize = dentry->d_sb->s_blocksize; 1922 /* changed to accommodate gcc folks. */ 1923 buf->f_type = REISERFS_SUPER_MAGIC; 1924 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2); 1925 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2, 1926 sizeof(rs->s_uuid)/2); 1927 1928 return 0; 1929} 1930 1931#ifdef CONFIG_QUOTA 1932static int reiserfs_write_dquot(struct dquot *dquot) 1933{ 1934 struct reiserfs_transaction_handle th; 1935 int ret, err; 1936 1937 reiserfs_write_lock(dquot->dq_sb); 1938 ret = 1939 journal_begin(&th, dquot->dq_sb, 1940 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 1941 if (ret) 1942 goto out; 1943 ret = dquot_commit(dquot); 1944 err = 1945 journal_end(&th, dquot->dq_sb, 1946 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 1947 if (!ret && err) 1948 ret = err; 1949 out: 1950 reiserfs_write_unlock(dquot->dq_sb); 1951 return ret; 1952} 1953 1954static int reiserfs_acquire_dquot(struct dquot *dquot) 1955{ 1956 struct reiserfs_transaction_handle th; 1957 int ret, err; 1958 1959 reiserfs_write_lock(dquot->dq_sb); 1960 ret = 1961 journal_begin(&th, dquot->dq_sb, 1962 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 1963 if (ret) 1964 goto out; 1965 ret = dquot_acquire(dquot); 1966 err = 1967 journal_end(&th, dquot->dq_sb, 1968 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 1969 if (!ret && err) 1970 ret = err; 1971 out: 1972 reiserfs_write_unlock(dquot->dq_sb); 1973 return ret; 1974} 1975 1976static int reiserfs_release_dquot(struct dquot *dquot) 1977{ 1978 struct reiserfs_transaction_handle th; 1979 int ret, err; 1980 1981 reiserfs_write_lock(dquot->dq_sb); 1982 ret = 1983 journal_begin(&th, dquot->dq_sb, 1984 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 1985 if (ret) { 1986 /* Release dquot anyway to avoid endless cycle in dqput() */ 1987 dquot_release(dquot); 1988 goto out; 1989 } 1990 ret = dquot_release(dquot); 1991 err = 1992 journal_end(&th, dquot->dq_sb, 1993 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 1994 if (!ret && err) 1995 ret = err; 1996 out: 1997 reiserfs_write_unlock(dquot->dq_sb); 1998 return ret; 1999} 2000 2001static int reiserfs_mark_dquot_dirty(struct dquot *dquot) 2002{ 2003 /* Are we journaling quotas? */ 2004 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 2005 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 2006 dquot_mark_dquot_dirty(dquot); 2007 return reiserfs_write_dquot(dquot); 2008 } else 2009 return dquot_mark_dquot_dirty(dquot); 2010} 2011 2012static int reiserfs_write_info(struct super_block *sb, int type) 2013{ 2014 struct reiserfs_transaction_handle th; 2015 int ret, err; 2016 2017 /* Data block + inode block */ 2018 reiserfs_write_lock(sb); 2019 ret = journal_begin(&th, sb, 2); 2020 if (ret) 2021 goto out; 2022 ret = dquot_commit_info(sb, type); 2023 err = journal_end(&th, sb, 2); 2024 if (!ret && err) 2025 ret = err; 2026 out: 2027 reiserfs_write_unlock(sb); 2028 return ret; 2029} 2030 2031/* 2032 * Turn on quotas during mount time - we need to find the quota file and such... 2033 */ 2034static int reiserfs_quota_on_mount(struct super_block *sb, int type) 2035{ 2036 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type], 2037 REISERFS_SB(sb)->s_jquota_fmt, type); 2038} 2039 2040/* 2041 * Standard function to be called on quota_on 2042 */ 2043static int reiserfs_quota_on(struct super_block *sb, int type, int format_id, 2044 char *name) 2045{ 2046 int err; 2047 struct path path; 2048 struct inode *inode; 2049 struct reiserfs_transaction_handle th; 2050 2051 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA))) 2052 return -EINVAL; 2053 2054 err = kern_path(name, LOOKUP_FOLLOW, &path); 2055 if (err) 2056 return err; 2057 /* Quotafile not on the same filesystem? */ 2058 if (path.mnt->mnt_sb != sb) { 2059 err = -EXDEV; 2060 goto out; 2061 } 2062 inode = path.dentry->d_inode; 2063 /* We must not pack tails for quota files on reiserfs for quota IO to work */ 2064 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) { 2065 err = reiserfs_unpack(inode, NULL); 2066 if (err) { 2067 reiserfs_warning(sb, "super-6520", 2068 "Unpacking tail of quota file failed" 2069 " (%d). Cannot turn on quotas.", err); 2070 err = -EINVAL; 2071 goto out; 2072 } 2073 mark_inode_dirty(inode); 2074 } 2075 /* Journaling quota? */ 2076 if (REISERFS_SB(sb)->s_qf_names[type]) { 2077 /* Quotafile not of fs root? */ 2078 if (path.dentry->d_parent != sb->s_root) 2079 reiserfs_warning(sb, "super-6521", 2080 "Quota file not on filesystem root. " 2081 "Journalled quota will not work."); 2082 } 2083 2084 /* 2085 * When we journal data on quota file, we have to flush journal to see 2086 * all updates to the file when we bypass pagecache... 2087 */ 2088 if (reiserfs_file_data_log(inode)) { 2089 /* Just start temporary transaction and finish it */ 2090 err = journal_begin(&th, sb, 1); 2091 if (err) 2092 goto out; 2093 err = journal_end_sync(&th, sb, 1); 2094 if (err) 2095 goto out; 2096 } 2097 err = dquot_quota_on_path(sb, type, format_id, &path); 2098out: 2099 path_put(&path); 2100 return err; 2101} 2102 2103/* Read data from quotafile - avoid pagecache and such because we cannot afford 2104 * acquiring the locks... As quota files are never truncated and quota code 2105 * itself serializes the operations (and noone else should touch the files) 2106 * we don't have to be afraid of races */ 2107static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data, 2108 size_t len, loff_t off) 2109{ 2110 struct inode *inode = sb_dqopt(sb)->files[type]; 2111 unsigned long blk = off >> sb->s_blocksize_bits; 2112 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; 2113 size_t toread; 2114 struct buffer_head tmp_bh, *bh; 2115 loff_t i_size = i_size_read(inode); 2116 2117 if (off > i_size) 2118 return 0; 2119 if (off + len > i_size) 2120 len = i_size - off; 2121 toread = len; 2122 while (toread > 0) { 2123 tocopy = 2124 sb->s_blocksize - offset < 2125 toread ? sb->s_blocksize - offset : toread; 2126 tmp_bh.b_state = 0; 2127 /* Quota files are without tails so we can safely use this function */ 2128 reiserfs_write_lock(sb); 2129 err = reiserfs_get_block(inode, blk, &tmp_bh, 0); 2130 reiserfs_write_unlock(sb); 2131 if (err) 2132 return err; 2133 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 2134 memset(data, 0, tocopy); 2135 else { 2136 bh = sb_bread(sb, tmp_bh.b_blocknr); 2137 if (!bh) 2138 return -EIO; 2139 memcpy(data, bh->b_data + offset, tocopy); 2140 brelse(bh); 2141 } 2142 offset = 0; 2143 toread -= tocopy; 2144 data += tocopy; 2145 blk++; 2146 } 2147 return len; 2148} 2149 2150/* Write to quotafile (we know the transaction is already started and has 2151 * enough credits) */ 2152static ssize_t reiserfs_quota_write(struct super_block *sb, int type, 2153 const char *data, size_t len, loff_t off) 2154{ 2155 struct inode *inode = sb_dqopt(sb)->files[type]; 2156 unsigned long blk = off >> sb->s_blocksize_bits; 2157 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy; 2158 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL; 2159 size_t towrite = len; 2160 struct buffer_head tmp_bh, *bh; 2161 2162 if (!current->journal_info) { 2163 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)" 2164 " cancelled because transaction is not started.\n", 2165 (unsigned long long)off, (unsigned long long)len); 2166 return -EIO; 2167 } 2168 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2169 while (towrite > 0) { 2170 tocopy = sb->s_blocksize - offset < towrite ? 2171 sb->s_blocksize - offset : towrite; 2172 tmp_bh.b_state = 0; 2173 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE); 2174 if (err) 2175 goto out; 2176 if (offset || tocopy != sb->s_blocksize) 2177 bh = sb_bread(sb, tmp_bh.b_blocknr); 2178 else 2179 bh = sb_getblk(sb, tmp_bh.b_blocknr); 2180 if (!bh) { 2181 err = -EIO; 2182 goto out; 2183 } 2184 lock_buffer(bh); 2185 memcpy(bh->b_data + offset, data, tocopy); 2186 flush_dcache_page(bh->b_page); 2187 set_buffer_uptodate(bh); 2188 unlock_buffer(bh); 2189 reiserfs_prepare_for_journal(sb, bh, 1); 2190 journal_mark_dirty(current->journal_info, sb, bh); 2191 if (!journal_quota) 2192 reiserfs_add_ordered_list(inode, bh); 2193 brelse(bh); 2194 offset = 0; 2195 towrite -= tocopy; 2196 data += tocopy; 2197 blk++; 2198 } 2199out: 2200 if (len == towrite) { 2201 mutex_unlock(&inode->i_mutex); 2202 return err; 2203 } 2204 if (inode->i_size < off + len - towrite) 2205 i_size_write(inode, off + len - towrite); 2206 inode->i_version++; 2207 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2208 mark_inode_dirty(inode); 2209 mutex_unlock(&inode->i_mutex); 2210 return len - towrite; 2211} 2212 2213#endif 2214 2215static int get_super_block(struct file_system_type *fs_type, 2216 int flags, const char *dev_name, 2217 void *data, struct vfsmount *mnt) 2218{ 2219 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super, 2220 mnt); 2221} 2222 2223static int __init init_reiserfs_fs(void) 2224{ 2225 int ret; 2226 2227 if ((ret = init_inodecache())) { 2228 return ret; 2229 } 2230 2231 reiserfs_proc_info_global_init(); 2232 2233 ret = register_filesystem(&reiserfs_fs_type); 2234 2235 if (ret == 0) { 2236 return 0; 2237 } 2238 2239 reiserfs_proc_info_global_done(); 2240 destroy_inodecache(); 2241 2242 return ret; 2243} 2244 2245static void __exit exit_reiserfs_fs(void) 2246{ 2247 reiserfs_proc_info_global_done(); 2248 unregister_filesystem(&reiserfs_fs_type); 2249 destroy_inodecache(); 2250} 2251 2252struct file_system_type reiserfs_fs_type = { 2253 .owner = THIS_MODULE, 2254 .name = "reiserfs", 2255 .get_sb = get_super_block, 2256 .kill_sb = reiserfs_kill_sb, 2257 .fs_flags = FS_REQUIRES_DEV, 2258}; 2259 2260MODULE_DESCRIPTION("ReiserFS journaled filesystem"); 2261MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>"); 2262MODULE_LICENSE("GPL"); 2263 2264module_init(init_reiserfs_fs); 2265module_exit(exit_reiserfs_fs); 2266