1 /* 2 ** Write ahead logging implementation copyright Chris Mason 2000 3 ** 4 ** The background commits make this code very interrelated, and 5 ** overly complex. I need to rethink things a bit....The major players: 6 ** 7 ** journal_begin -- call with the number of blocks you expect to log. 8 ** If the current transaction is too 9 ** old, it will block until the current transaction is 10 ** finished, and then start a new one. 11 ** Usually, your transaction will get joined in with 12 ** previous ones for speed. 13 ** 14 ** journal_join -- same as journal_begin, but won't block on the current 15 ** transaction regardless of age. Don't ever call 16 ** this. Ever. There are only two places it should be 17 ** called from, and they are both inside this file. 18 ** 19 ** journal_mark_dirty -- adds blocks into this transaction. clears any flags 20 ** that might make them get sent to disk 21 ** and then marks them BH_JDirty. Puts the buffer head 22 ** into the current transaction hash. 23 ** 24 ** journal_end -- if the current transaction is batchable, it does nothing 25 ** otherwise, it could do an async/synchronous commit, or 26 ** a full flush of all log and real blocks in the 27 ** transaction. 28 ** 29 ** flush_old_commits -- if the current transaction is too old, it is ended and 30 ** commit blocks are sent to disk. Forces commit blocks 31 ** to disk for all backgrounded commits that have been 32 ** around too long. 33 ** -- Note, if you call this as an immediate flush from 34 ** from within kupdate, it will ignore the immediate flag 35 */ 36 37 #include <linux/time.h> 38 #include <linux/semaphore.h> 39 #include <linux/vmalloc.h> 40 #include "reiserfs.h" 41 #include <linux/kernel.h> 42 #include <linux/errno.h> 43 #include <linux/fcntl.h> 44 #include <linux/stat.h> 45 #include <linux/string.h> 46 #include <linux/buffer_head.h> 47 #include <linux/workqueue.h> 48 #include <linux/writeback.h> 49 #include <linux/blkdev.h> 50 #include <linux/backing-dev.h> 51 #include <linux/uaccess.h> 52 #include <linux/slab.h> 53 54 55 /* gets a struct reiserfs_journal_list * from a list head */ 56 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ 57 j_list)) 58 #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ 59 j_working_list)) 60 61 /* the number of mounted filesystems. This is used to decide when to 62 ** start and kill the commit workqueue 63 */ 64 static int reiserfs_mounted_fs_count; 65 66 static struct workqueue_struct *commit_wq; 67 68 #define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit 69 structs at 4k */ 70 #define BUFNR 64 /*read ahead */ 71 72 /* cnode stat bits. Move these into reiserfs_fs.h */ 73 74 #define BLOCK_FREED 2 /* this block was freed, and can't be written. */ 75 #define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */ 76 77 #define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */ 78 #define BLOCK_DIRTIED 5 79 80 /* journal list state bits */ 81 #define LIST_TOUCHED 1 82 #define LIST_DIRTY 2 83 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */ 84 85 /* flags for do_journal_end */ 86 #define FLUSH_ALL 1 /* flush commit and real blocks */ 87 #define COMMIT_NOW 2 /* end and commit this transaction */ 88 #define WAIT 4 /* wait for the log blocks to hit the disk */ 89 90 static int do_journal_end(struct reiserfs_transaction_handle *, 91 struct super_block *, unsigned long nblocks, 92 int flags); 93 static int flush_journal_list(struct super_block *s, 94 struct reiserfs_journal_list *jl, int flushall); 95 static int flush_commit_list(struct super_block *s, 96 struct reiserfs_journal_list *jl, int flushall); 97 static int can_dirty(struct reiserfs_journal_cnode *cn); 98 static int journal_join(struct reiserfs_transaction_handle *th, 99 struct super_block *sb, unsigned long nblocks); 100 static int release_journal_dev(struct super_block *super, 101 struct reiserfs_journal *journal); 102 static int dirty_one_transaction(struct super_block *s, 103 struct reiserfs_journal_list *jl); 104 static void flush_async_commits(struct work_struct *work); 105 static void queue_log_writer(struct super_block *s); 106 107 /* values for join in do_journal_begin_r */ 108 enum { 109 JBEGIN_REG = 0, /* regular journal begin */ 110 JBEGIN_JOIN = 1, /* join the running transaction if at all possible */ 111 JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */ 112 }; 113 114 static int do_journal_begin_r(struct reiserfs_transaction_handle *th, 115 struct super_block *sb, 116 unsigned long nblocks, int join); 117 118 static void init_journal_hash(struct super_block *sb) 119 { 120 struct reiserfs_journal *journal = SB_JOURNAL(sb); 121 memset(journal->j_hash_table, 0, 122 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); 123 } 124 125 /* 126 ** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to 127 ** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for 128 ** more details. 129 */ 130 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) 131 { 132 if (bh) { 133 clear_buffer_dirty(bh); 134 clear_buffer_journal_test(bh); 135 } 136 return 0; 137 } 138 139 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block 140 *sb) 141 { 142 struct reiserfs_bitmap_node *bn; 143 static int id; 144 145 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS); 146 if (!bn) { 147 return NULL; 148 } 149 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS); 150 if (!bn->data) { 151 kfree(bn); 152 return NULL; 153 } 154 bn->id = id++; 155 INIT_LIST_HEAD(&bn->list); 156 return bn; 157 } 158 159 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb) 160 { 161 struct reiserfs_journal *journal = SB_JOURNAL(sb); 162 struct reiserfs_bitmap_node *bn = NULL; 163 struct list_head *entry = journal->j_bitmap_nodes.next; 164 165 journal->j_used_bitmap_nodes++; 166 repeat: 167 168 if (entry != &journal->j_bitmap_nodes) { 169 bn = list_entry(entry, struct reiserfs_bitmap_node, list); 170 list_del(entry); 171 memset(bn->data, 0, sb->s_blocksize); 172 journal->j_free_bitmap_nodes--; 173 return bn; 174 } 175 bn = allocate_bitmap_node(sb); 176 if (!bn) { 177 yield(); 178 goto repeat; 179 } 180 return bn; 181 } 182 static inline void free_bitmap_node(struct super_block *sb, 183 struct reiserfs_bitmap_node *bn) 184 { 185 struct reiserfs_journal *journal = SB_JOURNAL(sb); 186 journal->j_used_bitmap_nodes--; 187 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) { 188 kfree(bn->data); 189 kfree(bn); 190 } else { 191 list_add(&bn->list, &journal->j_bitmap_nodes); 192 journal->j_free_bitmap_nodes++; 193 } 194 } 195 196 static void allocate_bitmap_nodes(struct super_block *sb) 197 { 198 int i; 199 struct reiserfs_journal *journal = SB_JOURNAL(sb); 200 struct reiserfs_bitmap_node *bn = NULL; 201 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) { 202 bn = allocate_bitmap_node(sb); 203 if (bn) { 204 list_add(&bn->list, &journal->j_bitmap_nodes); 205 journal->j_free_bitmap_nodes++; 206 } else { 207 break; /* this is ok, we'll try again when more are needed */ 208 } 209 } 210 } 211 212 static int set_bit_in_list_bitmap(struct super_block *sb, 213 b_blocknr_t block, 214 struct reiserfs_list_bitmap *jb) 215 { 216 unsigned int bmap_nr = block / (sb->s_blocksize << 3); 217 unsigned int bit_nr = block % (sb->s_blocksize << 3); 218 219 if (!jb->bitmaps[bmap_nr]) { 220 jb->bitmaps[bmap_nr] = get_bitmap_node(sb); 221 } 222 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data); 223 return 0; 224 } 225 226 static void cleanup_bitmap_list(struct super_block *sb, 227 struct reiserfs_list_bitmap *jb) 228 { 229 int i; 230 if (jb->bitmaps == NULL) 231 return; 232 233 for (i = 0; i < reiserfs_bmap_count(sb); i++) { 234 if (jb->bitmaps[i]) { 235 free_bitmap_node(sb, jb->bitmaps[i]); 236 jb->bitmaps[i] = NULL; 237 } 238 } 239 } 240 241 /* 242 ** only call this on FS unmount. 243 */ 244 static int free_list_bitmaps(struct super_block *sb, 245 struct reiserfs_list_bitmap *jb_array) 246 { 247 int i; 248 struct reiserfs_list_bitmap *jb; 249 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { 250 jb = jb_array + i; 251 jb->journal_list = NULL; 252 cleanup_bitmap_list(sb, jb); 253 vfree(jb->bitmaps); 254 jb->bitmaps = NULL; 255 } 256 return 0; 257 } 258 259 static int free_bitmap_nodes(struct super_block *sb) 260 { 261 struct reiserfs_journal *journal = SB_JOURNAL(sb); 262 struct list_head *next = journal->j_bitmap_nodes.next; 263 struct reiserfs_bitmap_node *bn; 264 265 while (next != &journal->j_bitmap_nodes) { 266 bn = list_entry(next, struct reiserfs_bitmap_node, list); 267 list_del(next); 268 kfree(bn->data); 269 kfree(bn); 270 next = journal->j_bitmap_nodes.next; 271 journal->j_free_bitmap_nodes--; 272 } 273 274 return 0; 275 } 276 277 /* 278 ** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. 279 ** jb_array is the array to be filled in. 280 */ 281 int reiserfs_allocate_list_bitmaps(struct super_block *sb, 282 struct reiserfs_list_bitmap *jb_array, 283 unsigned int bmap_nr) 284 { 285 int i; 286 int failed = 0; 287 struct reiserfs_list_bitmap *jb; 288 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *); 289 290 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { 291 jb = jb_array + i; 292 jb->journal_list = NULL; 293 jb->bitmaps = vzalloc(mem); 294 if (!jb->bitmaps) { 295 reiserfs_warning(sb, "clm-2000", "unable to " 296 "allocate bitmaps for journal lists"); 297 failed = 1; 298 break; 299 } 300 } 301 if (failed) { 302 free_list_bitmaps(sb, jb_array); 303 return -1; 304 } 305 return 0; 306 } 307 308 /* 309 ** find an available list bitmap. If you can't find one, flush a commit list 310 ** and try again 311 */ 312 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb, 313 struct reiserfs_journal_list 314 *jl) 315 { 316 int i, j; 317 struct reiserfs_journal *journal = SB_JOURNAL(sb); 318 struct reiserfs_list_bitmap *jb = NULL; 319 320 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) { 321 i = journal->j_list_bitmap_index; 322 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS; 323 jb = journal->j_list_bitmap + i; 324 if (journal->j_list_bitmap[i].journal_list) { 325 flush_commit_list(sb, 326 journal->j_list_bitmap[i]. 327 journal_list, 1); 328 if (!journal->j_list_bitmap[i].journal_list) { 329 break; 330 } 331 } else { 332 break; 333 } 334 } 335 if (jb->journal_list) { /* double check to make sure if flushed correctly */ 336 return NULL; 337 } 338 jb->journal_list = jl; 339 return jb; 340 } 341 342 /* 343 ** allocates a new chunk of X nodes, and links them all together as a list. 344 ** Uses the cnode->next and cnode->prev pointers 345 ** returns NULL on failure 346 */ 347 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) 348 { 349 struct reiserfs_journal_cnode *head; 350 int i; 351 if (num_cnodes <= 0) { 352 return NULL; 353 } 354 head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)); 355 if (!head) { 356 return NULL; 357 } 358 head[0].prev = NULL; 359 head[0].next = head + 1; 360 for (i = 1; i < num_cnodes; i++) { 361 head[i].prev = head + (i - 1); 362 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */ 363 } 364 head[num_cnodes - 1].next = NULL; 365 return head; 366 } 367 368 /* 369 ** pulls a cnode off the free list, or returns NULL on failure 370 */ 371 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb) 372 { 373 struct reiserfs_journal_cnode *cn; 374 struct reiserfs_journal *journal = SB_JOURNAL(sb); 375 376 reiserfs_check_lock_depth(sb, "get_cnode"); 377 378 if (journal->j_cnode_free <= 0) { 379 return NULL; 380 } 381 journal->j_cnode_used++; 382 journal->j_cnode_free--; 383 cn = journal->j_cnode_free_list; 384 if (!cn) { 385 return cn; 386 } 387 if (cn->next) { 388 cn->next->prev = NULL; 389 } 390 journal->j_cnode_free_list = cn->next; 391 memset(cn, 0, sizeof(struct reiserfs_journal_cnode)); 392 return cn; 393 } 394 395 /* 396 ** returns a cnode to the free list 397 */ 398 static void free_cnode(struct super_block *sb, 399 struct reiserfs_journal_cnode *cn) 400 { 401 struct reiserfs_journal *journal = SB_JOURNAL(sb); 402 403 reiserfs_check_lock_depth(sb, "free_cnode"); 404 405 journal->j_cnode_used--; 406 journal->j_cnode_free++; 407 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */ 408 cn->next = journal->j_cnode_free_list; 409 if (journal->j_cnode_free_list) { 410 journal->j_cnode_free_list->prev = cn; 411 } 412 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */ 413 journal->j_cnode_free_list = cn; 414 } 415 416 static void clear_prepared_bits(struct buffer_head *bh) 417 { 418 clear_buffer_journal_prepared(bh); 419 clear_buffer_journal_restore_dirty(bh); 420 } 421 422 /* return a cnode with same dev, block number and size in table, or null if not found */ 423 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct 424 super_block 425 *sb, 426 struct 427 reiserfs_journal_cnode 428 **table, 429 long bl) 430 { 431 struct reiserfs_journal_cnode *cn; 432 cn = journal_hash(table, sb, bl); 433 while (cn) { 434 if (cn->blocknr == bl && cn->sb == sb) 435 return cn; 436 cn = cn->hnext; 437 } 438 return (struct reiserfs_journal_cnode *)0; 439 } 440 441 /* 442 ** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated 443 ** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever 444 ** being overwritten by a replay after crashing. 445 ** 446 ** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting 447 ** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make 448 ** sure you never write the block without logging it. 449 ** 450 ** next_zero_bit is a suggestion about the next block to try for find_forward. 451 ** when bl is rejected because it is set in a journal list bitmap, we search 452 ** for the next zero bit in the bitmap that rejected bl. Then, we return that 453 ** through next_zero_bit for find_forward to try. 454 ** 455 ** Just because we return something in next_zero_bit does not mean we won't 456 ** reject it on the next call to reiserfs_in_journal 457 ** 458 */ 459 int reiserfs_in_journal(struct super_block *sb, 460 unsigned int bmap_nr, int bit_nr, int search_all, 461 b_blocknr_t * next_zero_bit) 462 { 463 struct reiserfs_journal *journal = SB_JOURNAL(sb); 464 struct reiserfs_journal_cnode *cn; 465 struct reiserfs_list_bitmap *jb; 466 int i; 467 unsigned long bl; 468 469 *next_zero_bit = 0; /* always start this at zero. */ 470 471 PROC_INFO_INC(sb, journal.in_journal); 472 /* If we aren't doing a search_all, this is a metablock, and it will be logged before use. 473 ** if we crash before the transaction that freed it commits, this transaction won't 474 ** have committed either, and the block will never be written 475 */ 476 if (search_all) { 477 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { 478 PROC_INFO_INC(sb, journal.in_journal_bitmap); 479 jb = journal->j_list_bitmap + i; 480 if (jb->journal_list && jb->bitmaps[bmap_nr] && 481 test_bit(bit_nr, 482 (unsigned long *)jb->bitmaps[bmap_nr]-> 483 data)) { 484 *next_zero_bit = 485 find_next_zero_bit((unsigned long *) 486 (jb->bitmaps[bmap_nr]-> 487 data), 488 sb->s_blocksize << 3, 489 bit_nr + 1); 490 return 1; 491 } 492 } 493 } 494 495 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr; 496 /* is it in any old transactions? */ 497 if (search_all 498 && (cn = 499 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) { 500 return 1; 501 } 502 503 /* is it in the current transaction. This should never happen */ 504 if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) { 505 BUG(); 506 return 1; 507 } 508 509 PROC_INFO_INC(sb, journal.in_journal_reusable); 510 /* safe for reuse */ 511 return 0; 512 } 513 514 /* insert cn into table 515 */ 516 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table, 517 struct reiserfs_journal_cnode *cn) 518 { 519 struct reiserfs_journal_cnode *cn_orig; 520 521 cn_orig = journal_hash(table, cn->sb, cn->blocknr); 522 cn->hnext = cn_orig; 523 cn->hprev = NULL; 524 if (cn_orig) { 525 cn_orig->hprev = cn; 526 } 527 journal_hash(table, cn->sb, cn->blocknr) = cn; 528 } 529 530 /* lock the current transaction */ 531 static inline void lock_journal(struct super_block *sb) 532 { 533 PROC_INFO_INC(sb, journal.lock_journal); 534 535 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb); 536 } 537 538 /* unlock the current transaction */ 539 static inline void unlock_journal(struct super_block *sb) 540 { 541 mutex_unlock(&SB_JOURNAL(sb)->j_mutex); 542 } 543 544 static inline void get_journal_list(struct reiserfs_journal_list *jl) 545 { 546 jl->j_refcount++; 547 } 548 549 static inline void put_journal_list(struct super_block *s, 550 struct reiserfs_journal_list *jl) 551 { 552 if (jl->j_refcount < 1) { 553 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d", 554 jl->j_trans_id, jl->j_refcount); 555 } 556 if (--jl->j_refcount == 0) 557 kfree(jl); 558 } 559 560 /* 561 ** this used to be much more involved, and I'm keeping it just in case things get ugly again. 562 ** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a 563 ** transaction. 564 */ 565 static void cleanup_freed_for_journal_list(struct super_block *sb, 566 struct reiserfs_journal_list *jl) 567 { 568 569 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap; 570 if (jb) { 571 cleanup_bitmap_list(sb, jb); 572 } 573 jl->j_list_bitmap->journal_list = NULL; 574 jl->j_list_bitmap = NULL; 575 } 576 577 static int journal_list_still_alive(struct super_block *s, 578 unsigned int trans_id) 579 { 580 struct reiserfs_journal *journal = SB_JOURNAL(s); 581 struct list_head *entry = &journal->j_journal_list; 582 struct reiserfs_journal_list *jl; 583 584 if (!list_empty(entry)) { 585 jl = JOURNAL_LIST_ENTRY(entry->next); 586 if (jl->j_trans_id <= trans_id) { 587 return 1; 588 } 589 } 590 return 0; 591 } 592 593 /* 594 * If page->mapping was null, we failed to truncate this page for 595 * some reason. Most likely because it was truncated after being 596 * logged via data=journal. 597 * 598 * This does a check to see if the buffer belongs to one of these 599 * lost pages before doing the final put_bh. If page->mapping was 600 * null, it tries to free buffers on the page, which should make the 601 * final page_cache_release drop the page from the lru. 602 */ 603 static void release_buffer_page(struct buffer_head *bh) 604 { 605 struct page *page = bh->b_page; 606 if (!page->mapping && trylock_page(page)) { 607 page_cache_get(page); 608 put_bh(bh); 609 if (!page->mapping) 610 try_to_free_buffers(page); 611 unlock_page(page); 612 page_cache_release(page); 613 } else { 614 put_bh(bh); 615 } 616 } 617 618 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) 619 { 620 char b[BDEVNAME_SIZE]; 621 622 if (buffer_journaled(bh)) { 623 reiserfs_warning(NULL, "clm-2084", 624 "pinned buffer %lu:%s sent to disk", 625 bh->b_blocknr, bdevname(bh->b_bdev, b)); 626 } 627 if (uptodate) 628 set_buffer_uptodate(bh); 629 else 630 clear_buffer_uptodate(bh); 631 632 unlock_buffer(bh); 633 release_buffer_page(bh); 634 } 635 636 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate) 637 { 638 if (uptodate) 639 set_buffer_uptodate(bh); 640 else 641 clear_buffer_uptodate(bh); 642 unlock_buffer(bh); 643 put_bh(bh); 644 } 645 646 static void submit_logged_buffer(struct buffer_head *bh) 647 { 648 get_bh(bh); 649 bh->b_end_io = reiserfs_end_buffer_io_sync; 650 clear_buffer_journal_new(bh); 651 clear_buffer_dirty(bh); 652 if (!test_clear_buffer_journal_test(bh)) 653 BUG(); 654 if (!buffer_uptodate(bh)) 655 BUG(); 656 submit_bh(WRITE, bh); 657 } 658 659 static void submit_ordered_buffer(struct buffer_head *bh) 660 { 661 get_bh(bh); 662 bh->b_end_io = reiserfs_end_ordered_io; 663 clear_buffer_dirty(bh); 664 if (!buffer_uptodate(bh)) 665 BUG(); 666 submit_bh(WRITE, bh); 667 } 668 669 #define CHUNK_SIZE 32 670 struct buffer_chunk { 671 struct buffer_head *bh[CHUNK_SIZE]; 672 int nr; 673 }; 674 675 static void write_chunk(struct buffer_chunk *chunk) 676 { 677 int i; 678 for (i = 0; i < chunk->nr; i++) { 679 submit_logged_buffer(chunk->bh[i]); 680 } 681 chunk->nr = 0; 682 } 683 684 static void write_ordered_chunk(struct buffer_chunk *chunk) 685 { 686 int i; 687 for (i = 0; i < chunk->nr; i++) { 688 submit_ordered_buffer(chunk->bh[i]); 689 } 690 chunk->nr = 0; 691 } 692 693 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh, 694 spinlock_t * lock, void (fn) (struct buffer_chunk *)) 695 { 696 int ret = 0; 697 BUG_ON(chunk->nr >= CHUNK_SIZE); 698 chunk->bh[chunk->nr++] = bh; 699 if (chunk->nr >= CHUNK_SIZE) { 700 ret = 1; 701 if (lock) 702 spin_unlock(lock); 703 fn(chunk); 704 if (lock) 705 spin_lock(lock); 706 } 707 return ret; 708 } 709 710 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0); 711 static struct reiserfs_jh *alloc_jh(void) 712 { 713 struct reiserfs_jh *jh; 714 while (1) { 715 jh = kmalloc(sizeof(*jh), GFP_NOFS); 716 if (jh) { 717 atomic_inc(&nr_reiserfs_jh); 718 return jh; 719 } 720 yield(); 721 } 722 } 723 724 /* 725 * we want to free the jh when the buffer has been written 726 * and waited on 727 */ 728 void reiserfs_free_jh(struct buffer_head *bh) 729 { 730 struct reiserfs_jh *jh; 731 732 jh = bh->b_private; 733 if (jh) { 734 bh->b_private = NULL; 735 jh->bh = NULL; 736 list_del_init(&jh->list); 737 kfree(jh); 738 if (atomic_read(&nr_reiserfs_jh) <= 0) 739 BUG(); 740 atomic_dec(&nr_reiserfs_jh); 741 put_bh(bh); 742 } 743 } 744 745 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh, 746 int tail) 747 { 748 struct reiserfs_jh *jh; 749 750 if (bh->b_private) { 751 spin_lock(&j->j_dirty_buffers_lock); 752 if (!bh->b_private) { 753 spin_unlock(&j->j_dirty_buffers_lock); 754 goto no_jh; 755 } 756 jh = bh->b_private; 757 list_del_init(&jh->list); 758 } else { 759 no_jh: 760 get_bh(bh); 761 jh = alloc_jh(); 762 spin_lock(&j->j_dirty_buffers_lock); 763 /* buffer must be locked for __add_jh, should be able to have 764 * two adds at the same time 765 */ 766 BUG_ON(bh->b_private); 767 jh->bh = bh; 768 bh->b_private = jh; 769 } 770 jh->jl = j->j_current_jl; 771 if (tail) 772 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list); 773 else { 774 list_add_tail(&jh->list, &jh->jl->j_bh_list); 775 } 776 spin_unlock(&j->j_dirty_buffers_lock); 777 return 0; 778 } 779 780 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh) 781 { 782 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1); 783 } 784 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh) 785 { 786 return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0); 787 } 788 789 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list) 790 static int write_ordered_buffers(spinlock_t * lock, 791 struct reiserfs_journal *j, 792 struct reiserfs_journal_list *jl, 793 struct list_head *list) 794 { 795 struct buffer_head *bh; 796 struct reiserfs_jh *jh; 797 int ret = j->j_errno; 798 struct buffer_chunk chunk; 799 struct list_head tmp; 800 INIT_LIST_HEAD(&tmp); 801 802 chunk.nr = 0; 803 spin_lock(lock); 804 while (!list_empty(list)) { 805 jh = JH_ENTRY(list->next); 806 bh = jh->bh; 807 get_bh(bh); 808 if (!trylock_buffer(bh)) { 809 if (!buffer_dirty(bh)) { 810 list_move(&jh->list, &tmp); 811 goto loop_next; 812 } 813 spin_unlock(lock); 814 if (chunk.nr) 815 write_ordered_chunk(&chunk); 816 wait_on_buffer(bh); 817 cond_resched(); 818 spin_lock(lock); 819 goto loop_next; 820 } 821 /* in theory, dirty non-uptodate buffers should never get here, 822 * but the upper layer io error paths still have a few quirks. 823 * Handle them here as gracefully as we can 824 */ 825 if (!buffer_uptodate(bh) && buffer_dirty(bh)) { 826 clear_buffer_dirty(bh); 827 ret = -EIO; 828 } 829 if (buffer_dirty(bh)) { 830 list_move(&jh->list, &tmp); 831 add_to_chunk(&chunk, bh, lock, write_ordered_chunk); 832 } else { 833 reiserfs_free_jh(bh); 834 unlock_buffer(bh); 835 } 836 loop_next: 837 put_bh(bh); 838 cond_resched_lock(lock); 839 } 840 if (chunk.nr) { 841 spin_unlock(lock); 842 write_ordered_chunk(&chunk); 843 spin_lock(lock); 844 } 845 while (!list_empty(&tmp)) { 846 jh = JH_ENTRY(tmp.prev); 847 bh = jh->bh; 848 get_bh(bh); 849 reiserfs_free_jh(bh); 850 851 if (buffer_locked(bh)) { 852 spin_unlock(lock); 853 wait_on_buffer(bh); 854 spin_lock(lock); 855 } 856 if (!buffer_uptodate(bh)) { 857 ret = -EIO; 858 } 859 /* ugly interaction with invalidatepage here. 860 * reiserfs_invalidate_page will pin any buffer that has a valid 861 * journal head from an older transaction. If someone else sets 862 * our buffer dirty after we write it in the first loop, and 863 * then someone truncates the page away, nobody will ever write 864 * the buffer. We're safe if we write the page one last time 865 * after freeing the journal header. 866 */ 867 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) { 868 spin_unlock(lock); 869 ll_rw_block(WRITE, 1, &bh); 870 spin_lock(lock); 871 } 872 put_bh(bh); 873 cond_resched_lock(lock); 874 } 875 spin_unlock(lock); 876 return ret; 877 } 878 879 static int flush_older_commits(struct super_block *s, 880 struct reiserfs_journal_list *jl) 881 { 882 struct reiserfs_journal *journal = SB_JOURNAL(s); 883 struct reiserfs_journal_list *other_jl; 884 struct reiserfs_journal_list *first_jl; 885 struct list_head *entry; 886 unsigned int trans_id = jl->j_trans_id; 887 unsigned int other_trans_id; 888 unsigned int first_trans_id; 889 890 find_first: 891 /* 892 * first we walk backwards to find the oldest uncommitted transation 893 */ 894 first_jl = jl; 895 entry = jl->j_list.prev; 896 while (1) { 897 other_jl = JOURNAL_LIST_ENTRY(entry); 898 if (entry == &journal->j_journal_list || 899 atomic_read(&other_jl->j_older_commits_done)) 900 break; 901 902 first_jl = other_jl; 903 entry = other_jl->j_list.prev; 904 } 905 906 /* if we didn't find any older uncommitted transactions, return now */ 907 if (first_jl == jl) { 908 return 0; 909 } 910 911 first_trans_id = first_jl->j_trans_id; 912 913 entry = &first_jl->j_list; 914 while (1) { 915 other_jl = JOURNAL_LIST_ENTRY(entry); 916 other_trans_id = other_jl->j_trans_id; 917 918 if (other_trans_id < trans_id) { 919 if (atomic_read(&other_jl->j_commit_left) != 0) { 920 flush_commit_list(s, other_jl, 0); 921 922 /* list we were called with is gone, return */ 923 if (!journal_list_still_alive(s, trans_id)) 924 return 1; 925 926 /* the one we just flushed is gone, this means all 927 * older lists are also gone, so first_jl is no longer 928 * valid either. Go back to the beginning. 929 */ 930 if (!journal_list_still_alive 931 (s, other_trans_id)) { 932 goto find_first; 933 } 934 } 935 entry = entry->next; 936 if (entry == &journal->j_journal_list) 937 return 0; 938 } else { 939 return 0; 940 } 941 } 942 return 0; 943 } 944 945 static int reiserfs_async_progress_wait(struct super_block *s) 946 { 947 struct reiserfs_journal *j = SB_JOURNAL(s); 948 949 if (atomic_read(&j->j_async_throttle)) { 950 reiserfs_write_unlock(s); 951 congestion_wait(BLK_RW_ASYNC, HZ / 10); 952 reiserfs_write_lock(s); 953 } 954 955 return 0; 956 } 957 958 /* 959 ** if this journal list still has commit blocks unflushed, send them to disk. 960 ** 961 ** log areas must be flushed in order (transaction 2 can't commit before transaction 1) 962 ** Before the commit block can by written, every other log block must be safely on disk 963 ** 964 */ 965 static int flush_commit_list(struct super_block *s, 966 struct reiserfs_journal_list *jl, int flushall) 967 { 968 int i; 969 b_blocknr_t bn; 970 struct buffer_head *tbh = NULL; 971 unsigned int trans_id = jl->j_trans_id; 972 struct reiserfs_journal *journal = SB_JOURNAL(s); 973 int retval = 0; 974 int write_len; 975 976 reiserfs_check_lock_depth(s, "flush_commit_list"); 977 978 if (atomic_read(&jl->j_older_commits_done)) { 979 return 0; 980 } 981 982 /* before we can put our commit blocks on disk, we have to make sure everyone older than 983 ** us is on disk too 984 */ 985 BUG_ON(jl->j_len <= 0); 986 BUG_ON(trans_id == journal->j_trans_id); 987 988 get_journal_list(jl); 989 if (flushall) { 990 if (flush_older_commits(s, jl) == 1) { 991 /* list disappeared during flush_older_commits. return */ 992 goto put_jl; 993 } 994 } 995 996 /* make sure nobody is trying to flush this one at the same time */ 997 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s); 998 999 if (!journal_list_still_alive(s, trans_id)) { 1000 mutex_unlock(&jl->j_commit_mutex); 1001 goto put_jl; 1002 } 1003 BUG_ON(jl->j_trans_id == 0); 1004 1005 /* this commit is done, exit */ 1006 if (atomic_read(&(jl->j_commit_left)) <= 0) { 1007 if (flushall) { 1008 atomic_set(&(jl->j_older_commits_done), 1); 1009 } 1010 mutex_unlock(&jl->j_commit_mutex); 1011 goto put_jl; 1012 } 1013 1014 if (!list_empty(&jl->j_bh_list)) { 1015 int ret; 1016 1017 /* 1018 * We might sleep in numerous places inside 1019 * write_ordered_buffers. Relax the write lock. 1020 */ 1021 reiserfs_write_unlock(s); 1022 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock, 1023 journal, jl, &jl->j_bh_list); 1024 if (ret < 0 && retval == 0) 1025 retval = ret; 1026 reiserfs_write_lock(s); 1027 } 1028 BUG_ON(!list_empty(&jl->j_bh_list)); 1029 /* 1030 * for the description block and all the log blocks, submit any buffers 1031 * that haven't already reached the disk. Try to write at least 256 1032 * log blocks. later on, we will only wait on blocks that correspond 1033 * to this transaction, but while we're unplugging we might as well 1034 * get a chunk of data on there. 1035 */ 1036 atomic_inc(&journal->j_async_throttle); 1037 write_len = jl->j_len + 1; 1038 if (write_len < 256) 1039 write_len = 256; 1040 for (i = 0 ; i < write_len ; i++) { 1041 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) % 1042 SB_ONDISK_JOURNAL_SIZE(s); 1043 tbh = journal_find_get_block(s, bn); 1044 if (tbh) { 1045 if (buffer_dirty(tbh)) { 1046 reiserfs_write_unlock(s); 1047 ll_rw_block(WRITE, 1, &tbh); 1048 reiserfs_write_lock(s); 1049 } 1050 put_bh(tbh) ; 1051 } 1052 } 1053 atomic_dec(&journal->j_async_throttle); 1054 1055 for (i = 0; i < (jl->j_len + 1); i++) { 1056 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + 1057 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s); 1058 tbh = journal_find_get_block(s, bn); 1059 1060 reiserfs_write_unlock(s); 1061 wait_on_buffer(tbh); 1062 reiserfs_write_lock(s); 1063 // since we're using ll_rw_blk above, it might have skipped over 1064 // a locked buffer. Double check here 1065 // 1066 /* redundant, sync_dirty_buffer() checks */ 1067 if (buffer_dirty(tbh)) { 1068 reiserfs_write_unlock(s); 1069 sync_dirty_buffer(tbh); 1070 reiserfs_write_lock(s); 1071 } 1072 if (unlikely(!buffer_uptodate(tbh))) { 1073 #ifdef CONFIG_REISERFS_CHECK 1074 reiserfs_warning(s, "journal-601", 1075 "buffer write failed"); 1076 #endif 1077 retval = -EIO; 1078 } 1079 put_bh(tbh); /* once for journal_find_get_block */ 1080 put_bh(tbh); /* once due to original getblk in do_journal_end */ 1081 atomic_dec(&(jl->j_commit_left)); 1082 } 1083 1084 BUG_ON(atomic_read(&(jl->j_commit_left)) != 1); 1085 1086 /* If there was a write error in the journal - we can't commit 1087 * this transaction - it will be invalid and, if successful, 1088 * will just end up propagating the write error out to 1089 * the file system. */ 1090 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) { 1091 if (buffer_dirty(jl->j_commit_bh)) 1092 BUG(); 1093 mark_buffer_dirty(jl->j_commit_bh) ; 1094 reiserfs_write_unlock(s); 1095 if (reiserfs_barrier_flush(s)) 1096 __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA); 1097 else 1098 sync_dirty_buffer(jl->j_commit_bh); 1099 reiserfs_write_lock(s); 1100 } 1101 1102 /* If there was a write error in the journal - we can't commit this 1103 * transaction - it will be invalid and, if successful, will just end 1104 * up propagating the write error out to the filesystem. */ 1105 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) { 1106 #ifdef CONFIG_REISERFS_CHECK 1107 reiserfs_warning(s, "journal-615", "buffer write failed"); 1108 #endif 1109 retval = -EIO; 1110 } 1111 bforget(jl->j_commit_bh); 1112 if (journal->j_last_commit_id != 0 && 1113 (jl->j_trans_id - journal->j_last_commit_id) != 1) { 1114 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu", 1115 journal->j_last_commit_id, jl->j_trans_id); 1116 } 1117 journal->j_last_commit_id = jl->j_trans_id; 1118 1119 /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */ 1120 cleanup_freed_for_journal_list(s, jl); 1121 1122 retval = retval ? retval : journal->j_errno; 1123 1124 /* mark the metadata dirty */ 1125 if (!retval) 1126 dirty_one_transaction(s, jl); 1127 atomic_dec(&(jl->j_commit_left)); 1128 1129 if (flushall) { 1130 atomic_set(&(jl->j_older_commits_done), 1); 1131 } 1132 mutex_unlock(&jl->j_commit_mutex); 1133 put_jl: 1134 put_journal_list(s, jl); 1135 1136 if (retval) 1137 reiserfs_abort(s, retval, "Journal write error in %s", 1138 __func__); 1139 return retval; 1140 } 1141 1142 /* 1143 ** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or 1144 ** returns NULL if it can't find anything 1145 */ 1146 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct 1147 reiserfs_journal_cnode 1148 *cn) 1149 { 1150 struct super_block *sb = cn->sb; 1151 b_blocknr_t blocknr = cn->blocknr; 1152 1153 cn = cn->hprev; 1154 while (cn) { 1155 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) { 1156 return cn->jlist; 1157 } 1158 cn = cn->hprev; 1159 } 1160 return NULL; 1161 } 1162 1163 static int newer_jl_done(struct reiserfs_journal_cnode *cn) 1164 { 1165 struct super_block *sb = cn->sb; 1166 b_blocknr_t blocknr = cn->blocknr; 1167 1168 cn = cn->hprev; 1169 while (cn) { 1170 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist && 1171 atomic_read(&cn->jlist->j_commit_left) != 0) 1172 return 0; 1173 cn = cn->hprev; 1174 } 1175 return 1; 1176 } 1177 1178 static void remove_journal_hash(struct super_block *, 1179 struct reiserfs_journal_cnode **, 1180 struct reiserfs_journal_list *, unsigned long, 1181 int); 1182 1183 /* 1184 ** once all the real blocks have been flushed, it is safe to remove them from the 1185 ** journal list for this transaction. Aside from freeing the cnode, this also allows the 1186 ** block to be reallocated for data blocks if it had been deleted. 1187 */ 1188 static void remove_all_from_journal_list(struct super_block *sb, 1189 struct reiserfs_journal_list *jl, 1190 int debug) 1191 { 1192 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1193 struct reiserfs_journal_cnode *cn, *last; 1194 cn = jl->j_realblock; 1195 1196 /* which is better, to lock once around the whole loop, or 1197 ** to lock for each call to remove_journal_hash? 1198 */ 1199 while (cn) { 1200 if (cn->blocknr != 0) { 1201 if (debug) { 1202 reiserfs_warning(sb, "reiserfs-2201", 1203 "block %u, bh is %d, state %ld", 1204 cn->blocknr, cn->bh ? 1 : 0, 1205 cn->state); 1206 } 1207 cn->state = 0; 1208 remove_journal_hash(sb, journal->j_list_hash_table, 1209 jl, cn->blocknr, 1); 1210 } 1211 last = cn; 1212 cn = cn->next; 1213 free_cnode(sb, last); 1214 } 1215 jl->j_realblock = NULL; 1216 } 1217 1218 /* 1219 ** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block. 1220 ** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start 1221 ** releasing blocks in this transaction for reuse as data blocks. 1222 ** called by flush_journal_list, before it calls remove_all_from_journal_list 1223 ** 1224 */ 1225 static int _update_journal_header_block(struct super_block *sb, 1226 unsigned long offset, 1227 unsigned int trans_id) 1228 { 1229 struct reiserfs_journal_header *jh; 1230 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1231 1232 if (reiserfs_is_journal_aborted(journal)) 1233 return -EIO; 1234 1235 if (trans_id >= journal->j_last_flush_trans_id) { 1236 if (buffer_locked((journal->j_header_bh))) { 1237 reiserfs_write_unlock(sb); 1238 wait_on_buffer((journal->j_header_bh)); 1239 reiserfs_write_lock(sb); 1240 if (unlikely(!buffer_uptodate(journal->j_header_bh))) { 1241 #ifdef CONFIG_REISERFS_CHECK 1242 reiserfs_warning(sb, "journal-699", 1243 "buffer write failed"); 1244 #endif 1245 return -EIO; 1246 } 1247 } 1248 journal->j_last_flush_trans_id = trans_id; 1249 journal->j_first_unflushed_offset = offset; 1250 jh = (struct reiserfs_journal_header *)(journal->j_header_bh-> 1251 b_data); 1252 jh->j_last_flush_trans_id = cpu_to_le32(trans_id); 1253 jh->j_first_unflushed_offset = cpu_to_le32(offset); 1254 jh->j_mount_id = cpu_to_le32(journal->j_mount_id); 1255 1256 set_buffer_dirty(journal->j_header_bh); 1257 reiserfs_write_unlock(sb); 1258 1259 if (reiserfs_barrier_flush(sb)) 1260 __sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA); 1261 else 1262 sync_dirty_buffer(journal->j_header_bh); 1263 1264 reiserfs_write_lock(sb); 1265 if (!buffer_uptodate(journal->j_header_bh)) { 1266 reiserfs_warning(sb, "journal-837", 1267 "IO error during journal replay"); 1268 return -EIO; 1269 } 1270 } 1271 return 0; 1272 } 1273 1274 static int update_journal_header_block(struct super_block *sb, 1275 unsigned long offset, 1276 unsigned int trans_id) 1277 { 1278 return _update_journal_header_block(sb, offset, trans_id); 1279 } 1280 1281 /* 1282 ** flush any and all journal lists older than you are 1283 ** can only be called from flush_journal_list 1284 */ 1285 static int flush_older_journal_lists(struct super_block *sb, 1286 struct reiserfs_journal_list *jl) 1287 { 1288 struct list_head *entry; 1289 struct reiserfs_journal_list *other_jl; 1290 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1291 unsigned int trans_id = jl->j_trans_id; 1292 1293 /* we know we are the only ones flushing things, no extra race 1294 * protection is required. 1295 */ 1296 restart: 1297 entry = journal->j_journal_list.next; 1298 /* Did we wrap? */ 1299 if (entry == &journal->j_journal_list) 1300 return 0; 1301 other_jl = JOURNAL_LIST_ENTRY(entry); 1302 if (other_jl->j_trans_id < trans_id) { 1303 BUG_ON(other_jl->j_refcount <= 0); 1304 /* do not flush all */ 1305 flush_journal_list(sb, other_jl, 0); 1306 1307 /* other_jl is now deleted from the list */ 1308 goto restart; 1309 } 1310 return 0; 1311 } 1312 1313 static void del_from_work_list(struct super_block *s, 1314 struct reiserfs_journal_list *jl) 1315 { 1316 struct reiserfs_journal *journal = SB_JOURNAL(s); 1317 if (!list_empty(&jl->j_working_list)) { 1318 list_del_init(&jl->j_working_list); 1319 journal->j_num_work_lists--; 1320 } 1321 } 1322 1323 /* flush a journal list, both commit and real blocks 1324 ** 1325 ** always set flushall to 1, unless you are calling from inside 1326 ** flush_journal_list 1327 ** 1328 ** IMPORTANT. This can only be called while there are no journal writers, 1329 ** and the journal is locked. That means it can only be called from 1330 ** do_journal_end, or by journal_release 1331 */ 1332 static int flush_journal_list(struct super_block *s, 1333 struct reiserfs_journal_list *jl, int flushall) 1334 { 1335 struct reiserfs_journal_list *pjl; 1336 struct reiserfs_journal_cnode *cn, *last; 1337 int count; 1338 int was_jwait = 0; 1339 int was_dirty = 0; 1340 struct buffer_head *saved_bh; 1341 unsigned long j_len_saved = jl->j_len; 1342 struct reiserfs_journal *journal = SB_JOURNAL(s); 1343 int err = 0; 1344 1345 BUG_ON(j_len_saved <= 0); 1346 1347 if (atomic_read(&journal->j_wcount) != 0) { 1348 reiserfs_warning(s, "clm-2048", "called with wcount %d", 1349 atomic_read(&journal->j_wcount)); 1350 } 1351 BUG_ON(jl->j_trans_id == 0); 1352 1353 /* if flushall == 0, the lock is already held */ 1354 if (flushall) { 1355 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); 1356 } else if (mutex_trylock(&journal->j_flush_mutex)) { 1357 BUG(); 1358 } 1359 1360 count = 0; 1361 if (j_len_saved > journal->j_trans_max) { 1362 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu", 1363 j_len_saved, jl->j_trans_id); 1364 return 0; 1365 } 1366 1367 /* if all the work is already done, get out of here */ 1368 if (atomic_read(&(jl->j_nonzerolen)) <= 0 && 1369 atomic_read(&(jl->j_commit_left)) <= 0) { 1370 goto flush_older_and_return; 1371 } 1372 1373 /* start by putting the commit list on disk. This will also flush 1374 ** the commit lists of any olders transactions 1375 */ 1376 flush_commit_list(s, jl, 1); 1377 1378 if (!(jl->j_state & LIST_DIRTY) 1379 && !reiserfs_is_journal_aborted(journal)) 1380 BUG(); 1381 1382 /* are we done now? */ 1383 if (atomic_read(&(jl->j_nonzerolen)) <= 0 && 1384 atomic_read(&(jl->j_commit_left)) <= 0) { 1385 goto flush_older_and_return; 1386 } 1387 1388 /* loop through each cnode, see if we need to write it, 1389 ** or wait on a more recent transaction, or just ignore it 1390 */ 1391 if (atomic_read(&(journal->j_wcount)) != 0) { 1392 reiserfs_panic(s, "journal-844", "journal list is flushing, " 1393 "wcount is not 0"); 1394 } 1395 cn = jl->j_realblock; 1396 while (cn) { 1397 was_jwait = 0; 1398 was_dirty = 0; 1399 saved_bh = NULL; 1400 /* blocknr of 0 is no longer in the hash, ignore it */ 1401 if (cn->blocknr == 0) { 1402 goto free_cnode; 1403 } 1404 1405 /* This transaction failed commit. Don't write out to the disk */ 1406 if (!(jl->j_state & LIST_DIRTY)) 1407 goto free_cnode; 1408 1409 pjl = find_newer_jl_for_cn(cn); 1410 /* the order is important here. We check pjl to make sure we 1411 ** don't clear BH_JDirty_wait if we aren't the one writing this 1412 ** block to disk 1413 */ 1414 if (!pjl && cn->bh) { 1415 saved_bh = cn->bh; 1416 1417 /* we do this to make sure nobody releases the buffer while 1418 ** we are working with it 1419 */ 1420 get_bh(saved_bh); 1421 1422 if (buffer_journal_dirty(saved_bh)) { 1423 BUG_ON(!can_dirty(cn)); 1424 was_jwait = 1; 1425 was_dirty = 1; 1426 } else if (can_dirty(cn)) { 1427 /* everything with !pjl && jwait should be writable */ 1428 BUG(); 1429 } 1430 } 1431 1432 /* if someone has this block in a newer transaction, just make 1433 ** sure they are committed, and don't try writing it to disk 1434 */ 1435 if (pjl) { 1436 if (atomic_read(&pjl->j_commit_left)) 1437 flush_commit_list(s, pjl, 1); 1438 goto free_cnode; 1439 } 1440 1441 /* bh == NULL when the block got to disk on its own, OR, 1442 ** the block got freed in a future transaction 1443 */ 1444 if (saved_bh == NULL) { 1445 goto free_cnode; 1446 } 1447 1448 /* this should never happen. kupdate_one_transaction has this list 1449 ** locked while it works, so we should never see a buffer here that 1450 ** is not marked JDirty_wait 1451 */ 1452 if ((!was_jwait) && !buffer_locked(saved_bh)) { 1453 reiserfs_warning(s, "journal-813", 1454 "BAD! buffer %llu %cdirty %cjwait, " 1455 "not in a newer tranasction", 1456 (unsigned long long)saved_bh-> 1457 b_blocknr, was_dirty ? ' ' : '!', 1458 was_jwait ? ' ' : '!'); 1459 } 1460 if (was_dirty) { 1461 /* we inc again because saved_bh gets decremented at free_cnode */ 1462 get_bh(saved_bh); 1463 set_bit(BLOCK_NEEDS_FLUSH, &cn->state); 1464 lock_buffer(saved_bh); 1465 BUG_ON(cn->blocknr != saved_bh->b_blocknr); 1466 if (buffer_dirty(saved_bh)) 1467 submit_logged_buffer(saved_bh); 1468 else 1469 unlock_buffer(saved_bh); 1470 count++; 1471 } else { 1472 reiserfs_warning(s, "clm-2082", 1473 "Unable to flush buffer %llu in %s", 1474 (unsigned long long)saved_bh-> 1475 b_blocknr, __func__); 1476 } 1477 free_cnode: 1478 last = cn; 1479 cn = cn->next; 1480 if (saved_bh) { 1481 /* we incremented this to keep others from taking the buffer head away */ 1482 put_bh(saved_bh); 1483 if (atomic_read(&(saved_bh->b_count)) < 0) { 1484 reiserfs_warning(s, "journal-945", 1485 "saved_bh->b_count < 0"); 1486 } 1487 } 1488 } 1489 if (count > 0) { 1490 cn = jl->j_realblock; 1491 while (cn) { 1492 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) { 1493 if (!cn->bh) { 1494 reiserfs_panic(s, "journal-1011", 1495 "cn->bh is NULL"); 1496 } 1497 1498 reiserfs_write_unlock(s); 1499 wait_on_buffer(cn->bh); 1500 reiserfs_write_lock(s); 1501 1502 if (!cn->bh) { 1503 reiserfs_panic(s, "journal-1012", 1504 "cn->bh is NULL"); 1505 } 1506 if (unlikely(!buffer_uptodate(cn->bh))) { 1507 #ifdef CONFIG_REISERFS_CHECK 1508 reiserfs_warning(s, "journal-949", 1509 "buffer write failed"); 1510 #endif 1511 err = -EIO; 1512 } 1513 /* note, we must clear the JDirty_wait bit after the up to date 1514 ** check, otherwise we race against our flushpage routine 1515 */ 1516 BUG_ON(!test_clear_buffer_journal_dirty 1517 (cn->bh)); 1518 1519 /* drop one ref for us */ 1520 put_bh(cn->bh); 1521 /* drop one ref for journal_mark_dirty */ 1522 release_buffer_page(cn->bh); 1523 } 1524 cn = cn->next; 1525 } 1526 } 1527 1528 if (err) 1529 reiserfs_abort(s, -EIO, 1530 "Write error while pushing transaction to disk in %s", 1531 __func__); 1532 flush_older_and_return: 1533 1534 /* before we can update the journal header block, we _must_ flush all 1535 ** real blocks from all older transactions to disk. This is because 1536 ** once the header block is updated, this transaction will not be 1537 ** replayed after a crash 1538 */ 1539 if (flushall) { 1540 flush_older_journal_lists(s, jl); 1541 } 1542 1543 err = journal->j_errno; 1544 /* before we can remove everything from the hash tables for this 1545 ** transaction, we must make sure it can never be replayed 1546 ** 1547 ** since we are only called from do_journal_end, we know for sure there 1548 ** are no allocations going on while we are flushing journal lists. So, 1549 ** we only need to update the journal header block for the last list 1550 ** being flushed 1551 */ 1552 if (!err && flushall) { 1553 err = 1554 update_journal_header_block(s, 1555 (jl->j_start + jl->j_len + 1556 2) % SB_ONDISK_JOURNAL_SIZE(s), 1557 jl->j_trans_id); 1558 if (err) 1559 reiserfs_abort(s, -EIO, 1560 "Write error while updating journal header in %s", 1561 __func__); 1562 } 1563 remove_all_from_journal_list(s, jl, 0); 1564 list_del_init(&jl->j_list); 1565 journal->j_num_lists--; 1566 del_from_work_list(s, jl); 1567 1568 if (journal->j_last_flush_id != 0 && 1569 (jl->j_trans_id - journal->j_last_flush_id) != 1) { 1570 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu", 1571 journal->j_last_flush_id, jl->j_trans_id); 1572 } 1573 journal->j_last_flush_id = jl->j_trans_id; 1574 1575 /* not strictly required since we are freeing the list, but it should 1576 * help find code using dead lists later on 1577 */ 1578 jl->j_len = 0; 1579 atomic_set(&(jl->j_nonzerolen), 0); 1580 jl->j_start = 0; 1581 jl->j_realblock = NULL; 1582 jl->j_commit_bh = NULL; 1583 jl->j_trans_id = 0; 1584 jl->j_state = 0; 1585 put_journal_list(s, jl); 1586 if (flushall) 1587 mutex_unlock(&journal->j_flush_mutex); 1588 return err; 1589 } 1590 1591 static int test_transaction(struct super_block *s, 1592 struct reiserfs_journal_list *jl) 1593 { 1594 struct reiserfs_journal_cnode *cn; 1595 1596 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) 1597 return 1; 1598 1599 cn = jl->j_realblock; 1600 while (cn) { 1601 /* if the blocknr == 0, this has been cleared from the hash, 1602 ** skip it 1603 */ 1604 if (cn->blocknr == 0) { 1605 goto next; 1606 } 1607 if (cn->bh && !newer_jl_done(cn)) 1608 return 0; 1609 next: 1610 cn = cn->next; 1611 cond_resched(); 1612 } 1613 return 0; 1614 } 1615 1616 static int write_one_transaction(struct super_block *s, 1617 struct reiserfs_journal_list *jl, 1618 struct buffer_chunk *chunk) 1619 { 1620 struct reiserfs_journal_cnode *cn; 1621 int ret = 0; 1622 1623 jl->j_state |= LIST_TOUCHED; 1624 del_from_work_list(s, jl); 1625 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) { 1626 return 0; 1627 } 1628 1629 cn = jl->j_realblock; 1630 while (cn) { 1631 /* if the blocknr == 0, this has been cleared from the hash, 1632 ** skip it 1633 */ 1634 if (cn->blocknr == 0) { 1635 goto next; 1636 } 1637 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) { 1638 struct buffer_head *tmp_bh; 1639 /* we can race against journal_mark_freed when we try 1640 * to lock_buffer(cn->bh), so we have to inc the buffer 1641 * count, and recheck things after locking 1642 */ 1643 tmp_bh = cn->bh; 1644 get_bh(tmp_bh); 1645 lock_buffer(tmp_bh); 1646 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) { 1647 if (!buffer_journal_dirty(tmp_bh) || 1648 buffer_journal_prepared(tmp_bh)) 1649 BUG(); 1650 add_to_chunk(chunk, tmp_bh, NULL, write_chunk); 1651 ret++; 1652 } else { 1653 /* note, cn->bh might be null now */ 1654 unlock_buffer(tmp_bh); 1655 } 1656 put_bh(tmp_bh); 1657 } 1658 next: 1659 cn = cn->next; 1660 cond_resched(); 1661 } 1662 return ret; 1663 } 1664 1665 /* used by flush_commit_list */ 1666 static int dirty_one_transaction(struct super_block *s, 1667 struct reiserfs_journal_list *jl) 1668 { 1669 struct reiserfs_journal_cnode *cn; 1670 struct reiserfs_journal_list *pjl; 1671 int ret = 0; 1672 1673 jl->j_state |= LIST_DIRTY; 1674 cn = jl->j_realblock; 1675 while (cn) { 1676 /* look for a more recent transaction that logged this 1677 ** buffer. Only the most recent transaction with a buffer in 1678 ** it is allowed to send that buffer to disk 1679 */ 1680 pjl = find_newer_jl_for_cn(cn); 1681 if (!pjl && cn->blocknr && cn->bh 1682 && buffer_journal_dirty(cn->bh)) { 1683 BUG_ON(!can_dirty(cn)); 1684 /* if the buffer is prepared, it will either be logged 1685 * or restored. If restored, we need to make sure 1686 * it actually gets marked dirty 1687 */ 1688 clear_buffer_journal_new(cn->bh); 1689 if (buffer_journal_prepared(cn->bh)) { 1690 set_buffer_journal_restore_dirty(cn->bh); 1691 } else { 1692 set_buffer_journal_test(cn->bh); 1693 mark_buffer_dirty(cn->bh); 1694 } 1695 } 1696 cn = cn->next; 1697 } 1698 return ret; 1699 } 1700 1701 static int kupdate_transactions(struct super_block *s, 1702 struct reiserfs_journal_list *jl, 1703 struct reiserfs_journal_list **next_jl, 1704 unsigned int *next_trans_id, 1705 int num_blocks, int num_trans) 1706 { 1707 int ret = 0; 1708 int written = 0; 1709 int transactions_flushed = 0; 1710 unsigned int orig_trans_id = jl->j_trans_id; 1711 struct buffer_chunk chunk; 1712 struct list_head *entry; 1713 struct reiserfs_journal *journal = SB_JOURNAL(s); 1714 chunk.nr = 0; 1715 1716 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); 1717 if (!journal_list_still_alive(s, orig_trans_id)) { 1718 goto done; 1719 } 1720 1721 /* we've got j_flush_mutex held, nobody is going to delete any 1722 * of these lists out from underneath us 1723 */ 1724 while ((num_trans && transactions_flushed < num_trans) || 1725 (!num_trans && written < num_blocks)) { 1726 1727 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) || 1728 atomic_read(&jl->j_commit_left) 1729 || !(jl->j_state & LIST_DIRTY)) { 1730 del_from_work_list(s, jl); 1731 break; 1732 } 1733 ret = write_one_transaction(s, jl, &chunk); 1734 1735 if (ret < 0) 1736 goto done; 1737 transactions_flushed++; 1738 written += ret; 1739 entry = jl->j_list.next; 1740 1741 /* did we wrap? */ 1742 if (entry == &journal->j_journal_list) { 1743 break; 1744 } 1745 jl = JOURNAL_LIST_ENTRY(entry); 1746 1747 /* don't bother with older transactions */ 1748 if (jl->j_trans_id <= orig_trans_id) 1749 break; 1750 } 1751 if (chunk.nr) { 1752 write_chunk(&chunk); 1753 } 1754 1755 done: 1756 mutex_unlock(&journal->j_flush_mutex); 1757 return ret; 1758 } 1759 1760 /* for o_sync and fsync heavy applications, they tend to use 1761 ** all the journa list slots with tiny transactions. These 1762 ** trigger lots and lots of calls to update the header block, which 1763 ** adds seeks and slows things down. 1764 ** 1765 ** This function tries to clear out a large chunk of the journal lists 1766 ** at once, which makes everything faster since only the newest journal 1767 ** list updates the header block 1768 */ 1769 static int flush_used_journal_lists(struct super_block *s, 1770 struct reiserfs_journal_list *jl) 1771 { 1772 unsigned long len = 0; 1773 unsigned long cur_len; 1774 int ret; 1775 int i; 1776 int limit = 256; 1777 struct reiserfs_journal_list *tjl; 1778 struct reiserfs_journal_list *flush_jl; 1779 unsigned int trans_id; 1780 struct reiserfs_journal *journal = SB_JOURNAL(s); 1781 1782 flush_jl = tjl = jl; 1783 1784 /* in data logging mode, try harder to flush a lot of blocks */ 1785 if (reiserfs_data_log(s)) 1786 limit = 1024; 1787 /* flush for 256 transactions or limit blocks, whichever comes first */ 1788 for (i = 0; i < 256 && len < limit; i++) { 1789 if (atomic_read(&tjl->j_commit_left) || 1790 tjl->j_trans_id < jl->j_trans_id) { 1791 break; 1792 } 1793 cur_len = atomic_read(&tjl->j_nonzerolen); 1794 if (cur_len > 0) { 1795 tjl->j_state &= ~LIST_TOUCHED; 1796 } 1797 len += cur_len; 1798 flush_jl = tjl; 1799 if (tjl->j_list.next == &journal->j_journal_list) 1800 break; 1801 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next); 1802 } 1803 /* try to find a group of blocks we can flush across all the 1804 ** transactions, but only bother if we've actually spanned 1805 ** across multiple lists 1806 */ 1807 if (flush_jl != jl) { 1808 ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i); 1809 } 1810 flush_journal_list(s, flush_jl, 1); 1811 return 0; 1812 } 1813 1814 /* 1815 ** removes any nodes in table with name block and dev as bh. 1816 ** only touchs the hnext and hprev pointers. 1817 */ 1818 void remove_journal_hash(struct super_block *sb, 1819 struct reiserfs_journal_cnode **table, 1820 struct reiserfs_journal_list *jl, 1821 unsigned long block, int remove_freed) 1822 { 1823 struct reiserfs_journal_cnode *cur; 1824 struct reiserfs_journal_cnode **head; 1825 1826 head = &(journal_hash(table, sb, block)); 1827 if (!head) { 1828 return; 1829 } 1830 cur = *head; 1831 while (cur) { 1832 if (cur->blocknr == block && cur->sb == sb 1833 && (jl == NULL || jl == cur->jlist) 1834 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) { 1835 if (cur->hnext) { 1836 cur->hnext->hprev = cur->hprev; 1837 } 1838 if (cur->hprev) { 1839 cur->hprev->hnext = cur->hnext; 1840 } else { 1841 *head = cur->hnext; 1842 } 1843 cur->blocknr = 0; 1844 cur->sb = NULL; 1845 cur->state = 0; 1846 if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */ 1847 atomic_dec(&(cur->jlist->j_nonzerolen)); 1848 cur->bh = NULL; 1849 cur->jlist = NULL; 1850 } 1851 cur = cur->hnext; 1852 } 1853 } 1854 1855 static void free_journal_ram(struct super_block *sb) 1856 { 1857 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1858 kfree(journal->j_current_jl); 1859 journal->j_num_lists--; 1860 1861 vfree(journal->j_cnode_free_orig); 1862 free_list_bitmaps(sb, journal->j_list_bitmap); 1863 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */ 1864 if (journal->j_header_bh) { 1865 brelse(journal->j_header_bh); 1866 } 1867 /* j_header_bh is on the journal dev, make sure not to release the journal 1868 * dev until we brelse j_header_bh 1869 */ 1870 release_journal_dev(sb, journal); 1871 vfree(journal); 1872 } 1873 1874 /* 1875 ** call on unmount. Only set error to 1 if you haven't made your way out 1876 ** of read_super() yet. Any other caller must keep error at 0. 1877 */ 1878 static int do_journal_release(struct reiserfs_transaction_handle *th, 1879 struct super_block *sb, int error) 1880 { 1881 struct reiserfs_transaction_handle myth; 1882 int flushed = 0; 1883 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1884 1885 /* we only want to flush out transactions if we were called with error == 0 1886 */ 1887 if (!error && !(sb->s_flags & MS_RDONLY)) { 1888 /* end the current trans */ 1889 BUG_ON(!th->t_trans_id); 1890 do_journal_end(th, sb, 10, FLUSH_ALL); 1891 1892 /* make sure something gets logged to force our way into the flush code */ 1893 if (!journal_join(&myth, sb, 1)) { 1894 reiserfs_prepare_for_journal(sb, 1895 SB_BUFFER_WITH_SB(sb), 1896 1); 1897 journal_mark_dirty(&myth, sb, 1898 SB_BUFFER_WITH_SB(sb)); 1899 do_journal_end(&myth, sb, 1, FLUSH_ALL); 1900 flushed = 1; 1901 } 1902 } 1903 1904 /* this also catches errors during the do_journal_end above */ 1905 if (!error && reiserfs_is_journal_aborted(journal)) { 1906 memset(&myth, 0, sizeof(myth)); 1907 if (!journal_join_abort(&myth, sb, 1)) { 1908 reiserfs_prepare_for_journal(sb, 1909 SB_BUFFER_WITH_SB(sb), 1910 1); 1911 journal_mark_dirty(&myth, sb, 1912 SB_BUFFER_WITH_SB(sb)); 1913 do_journal_end(&myth, sb, 1, FLUSH_ALL); 1914 } 1915 } 1916 1917 reiserfs_mounted_fs_count--; 1918 /* wait for all commits to finish */ 1919 cancel_delayed_work(&SB_JOURNAL(sb)->j_work); 1920 1921 /* 1922 * We must release the write lock here because 1923 * the workqueue job (flush_async_commit) needs this lock 1924 */ 1925 reiserfs_write_unlock(sb); 1926 1927 cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work); 1928 flush_workqueue(commit_wq); 1929 1930 if (!reiserfs_mounted_fs_count) { 1931 destroy_workqueue(commit_wq); 1932 commit_wq = NULL; 1933 } 1934 1935 free_journal_ram(sb); 1936 1937 reiserfs_write_lock(sb); 1938 1939 return 0; 1940 } 1941 1942 /* 1943 ** call on unmount. flush all journal trans, release all alloc'd ram 1944 */ 1945 int journal_release(struct reiserfs_transaction_handle *th, 1946 struct super_block *sb) 1947 { 1948 return do_journal_release(th, sb, 0); 1949 } 1950 1951 /* 1952 ** only call from an error condition inside reiserfs_read_super! 1953 */ 1954 int journal_release_error(struct reiserfs_transaction_handle *th, 1955 struct super_block *sb) 1956 { 1957 return do_journal_release(th, sb, 1); 1958 } 1959 1960 /* compares description block with commit block. returns 1 if they differ, 0 if they are the same */ 1961 static int journal_compare_desc_commit(struct super_block *sb, 1962 struct reiserfs_journal_desc *desc, 1963 struct reiserfs_journal_commit *commit) 1964 { 1965 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) || 1966 get_commit_trans_len(commit) != get_desc_trans_len(desc) || 1967 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max || 1968 get_commit_trans_len(commit) <= 0) { 1969 return 1; 1970 } 1971 return 0; 1972 } 1973 1974 /* returns 0 if it did not find a description block 1975 ** returns -1 if it found a corrupt commit block 1976 ** returns 1 if both desc and commit were valid 1977 */ 1978 static int journal_transaction_is_valid(struct super_block *sb, 1979 struct buffer_head *d_bh, 1980 unsigned int *oldest_invalid_trans_id, 1981 unsigned long *newest_mount_id) 1982 { 1983 struct reiserfs_journal_desc *desc; 1984 struct reiserfs_journal_commit *commit; 1985 struct buffer_head *c_bh; 1986 unsigned long offset; 1987 1988 if (!d_bh) 1989 return 0; 1990 1991 desc = (struct reiserfs_journal_desc *)d_bh->b_data; 1992 if (get_desc_trans_len(desc) > 0 1993 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) { 1994 if (oldest_invalid_trans_id && *oldest_invalid_trans_id 1995 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) { 1996 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 1997 "journal-986: transaction " 1998 "is valid returning because trans_id %d is greater than " 1999 "oldest_invalid %lu", 2000 get_desc_trans_id(desc), 2001 *oldest_invalid_trans_id); 2002 return 0; 2003 } 2004 if (newest_mount_id 2005 && *newest_mount_id > get_desc_mount_id(desc)) { 2006 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2007 "journal-1087: transaction " 2008 "is valid returning because mount_id %d is less than " 2009 "newest_mount_id %lu", 2010 get_desc_mount_id(desc), 2011 *newest_mount_id); 2012 return -1; 2013 } 2014 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) { 2015 reiserfs_warning(sb, "journal-2018", 2016 "Bad transaction length %d " 2017 "encountered, ignoring transaction", 2018 get_desc_trans_len(desc)); 2019 return -1; 2020 } 2021 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2022 2023 /* ok, we have a journal description block, lets see if the transaction was valid */ 2024 c_bh = 2025 journal_bread(sb, 2026 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2027 ((offset + get_desc_trans_len(desc) + 2028 1) % SB_ONDISK_JOURNAL_SIZE(sb))); 2029 if (!c_bh) 2030 return 0; 2031 commit = (struct reiserfs_journal_commit *)c_bh->b_data; 2032 if (journal_compare_desc_commit(sb, desc, commit)) { 2033 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2034 "journal_transaction_is_valid, commit offset %ld had bad " 2035 "time %d or length %d", 2036 c_bh->b_blocknr - 2037 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2038 get_commit_trans_id(commit), 2039 get_commit_trans_len(commit)); 2040 brelse(c_bh); 2041 if (oldest_invalid_trans_id) { 2042 *oldest_invalid_trans_id = 2043 get_desc_trans_id(desc); 2044 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2045 "journal-1004: " 2046 "transaction_is_valid setting oldest invalid trans_id " 2047 "to %d", 2048 get_desc_trans_id(desc)); 2049 } 2050 return -1; 2051 } 2052 brelse(c_bh); 2053 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2054 "journal-1006: found valid " 2055 "transaction start offset %llu, len %d id %d", 2056 d_bh->b_blocknr - 2057 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2058 get_desc_trans_len(desc), 2059 get_desc_trans_id(desc)); 2060 return 1; 2061 } else { 2062 return 0; 2063 } 2064 } 2065 2066 static void brelse_array(struct buffer_head **heads, int num) 2067 { 2068 int i; 2069 for (i = 0; i < num; i++) { 2070 brelse(heads[i]); 2071 } 2072 } 2073 2074 /* 2075 ** given the start, and values for the oldest acceptable transactions, 2076 ** this either reads in a replays a transaction, or returns because the transaction 2077 ** is invalid, or too old. 2078 */ 2079 static int journal_read_transaction(struct super_block *sb, 2080 unsigned long cur_dblock, 2081 unsigned long oldest_start, 2082 unsigned int oldest_trans_id, 2083 unsigned long newest_mount_id) 2084 { 2085 struct reiserfs_journal *journal = SB_JOURNAL(sb); 2086 struct reiserfs_journal_desc *desc; 2087 struct reiserfs_journal_commit *commit; 2088 unsigned int trans_id = 0; 2089 struct buffer_head *c_bh; 2090 struct buffer_head *d_bh; 2091 struct buffer_head **log_blocks = NULL; 2092 struct buffer_head **real_blocks = NULL; 2093 unsigned int trans_offset; 2094 int i; 2095 int trans_half; 2096 2097 d_bh = journal_bread(sb, cur_dblock); 2098 if (!d_bh) 2099 return 1; 2100 desc = (struct reiserfs_journal_desc *)d_bh->b_data; 2101 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2102 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: " 2103 "journal_read_transaction, offset %llu, len %d mount_id %d", 2104 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2105 get_desc_trans_len(desc), get_desc_mount_id(desc)); 2106 if (get_desc_trans_id(desc) < oldest_trans_id) { 2107 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: " 2108 "journal_read_trans skipping because %lu is too old", 2109 cur_dblock - 2110 SB_ONDISK_JOURNAL_1st_BLOCK(sb)); 2111 brelse(d_bh); 2112 return 1; 2113 } 2114 if (get_desc_mount_id(desc) != newest_mount_id) { 2115 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: " 2116 "journal_read_trans skipping because %d is != " 2117 "newest_mount_id %lu", get_desc_mount_id(desc), 2118 newest_mount_id); 2119 brelse(d_bh); 2120 return 1; 2121 } 2122 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2123 ((trans_offset + get_desc_trans_len(desc) + 1) % 2124 SB_ONDISK_JOURNAL_SIZE(sb))); 2125 if (!c_bh) { 2126 brelse(d_bh); 2127 return 1; 2128 } 2129 commit = (struct reiserfs_journal_commit *)c_bh->b_data; 2130 if (journal_compare_desc_commit(sb, desc, commit)) { 2131 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2132 "journal_read_transaction, " 2133 "commit offset %llu had bad time %d or length %d", 2134 c_bh->b_blocknr - 2135 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2136 get_commit_trans_id(commit), 2137 get_commit_trans_len(commit)); 2138 brelse(c_bh); 2139 brelse(d_bh); 2140 return 1; 2141 } 2142 2143 if (bdev_read_only(sb->s_bdev)) { 2144 reiserfs_warning(sb, "clm-2076", 2145 "device is readonly, unable to replay log"); 2146 brelse(c_bh); 2147 brelse(d_bh); 2148 return -EROFS; 2149 } 2150 2151 trans_id = get_desc_trans_id(desc); 2152 /* now we know we've got a good transaction, and it was inside the valid time ranges */ 2153 log_blocks = kmalloc(get_desc_trans_len(desc) * 2154 sizeof(struct buffer_head *), GFP_NOFS); 2155 real_blocks = kmalloc(get_desc_trans_len(desc) * 2156 sizeof(struct buffer_head *), GFP_NOFS); 2157 if (!log_blocks || !real_blocks) { 2158 brelse(c_bh); 2159 brelse(d_bh); 2160 kfree(log_blocks); 2161 kfree(real_blocks); 2162 reiserfs_warning(sb, "journal-1169", 2163 "kmalloc failed, unable to mount FS"); 2164 return -1; 2165 } 2166 /* get all the buffer heads */ 2167 trans_half = journal_trans_half(sb->s_blocksize); 2168 for (i = 0; i < get_desc_trans_len(desc); i++) { 2169 log_blocks[i] = 2170 journal_getblk(sb, 2171 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2172 (trans_offset + 1 + 2173 i) % SB_ONDISK_JOURNAL_SIZE(sb)); 2174 if (i < trans_half) { 2175 real_blocks[i] = 2176 sb_getblk(sb, 2177 le32_to_cpu(desc->j_realblock[i])); 2178 } else { 2179 real_blocks[i] = 2180 sb_getblk(sb, 2181 le32_to_cpu(commit-> 2182 j_realblock[i - trans_half])); 2183 } 2184 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) { 2185 reiserfs_warning(sb, "journal-1207", 2186 "REPLAY FAILURE fsck required! " 2187 "Block to replay is outside of " 2188 "filesystem"); 2189 goto abort_replay; 2190 } 2191 /* make sure we don't try to replay onto log or reserved area */ 2192 if (is_block_in_log_or_reserved_area 2193 (sb, real_blocks[i]->b_blocknr)) { 2194 reiserfs_warning(sb, "journal-1204", 2195 "REPLAY FAILURE fsck required! " 2196 "Trying to replay onto a log block"); 2197 abort_replay: 2198 brelse_array(log_blocks, i); 2199 brelse_array(real_blocks, i); 2200 brelse(c_bh); 2201 brelse(d_bh); 2202 kfree(log_blocks); 2203 kfree(real_blocks); 2204 return -1; 2205 } 2206 } 2207 /* read in the log blocks, memcpy to the corresponding real block */ 2208 ll_rw_block(READ, get_desc_trans_len(desc), log_blocks); 2209 for (i = 0; i < get_desc_trans_len(desc); i++) { 2210 2211 reiserfs_write_unlock(sb); 2212 wait_on_buffer(log_blocks[i]); 2213 reiserfs_write_lock(sb); 2214 2215 if (!buffer_uptodate(log_blocks[i])) { 2216 reiserfs_warning(sb, "journal-1212", 2217 "REPLAY FAILURE fsck required! " 2218 "buffer write failed"); 2219 brelse_array(log_blocks + i, 2220 get_desc_trans_len(desc) - i); 2221 brelse_array(real_blocks, get_desc_trans_len(desc)); 2222 brelse(c_bh); 2223 brelse(d_bh); 2224 kfree(log_blocks); 2225 kfree(real_blocks); 2226 return -1; 2227 } 2228 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, 2229 real_blocks[i]->b_size); 2230 set_buffer_uptodate(real_blocks[i]); 2231 brelse(log_blocks[i]); 2232 } 2233 /* flush out the real blocks */ 2234 for (i = 0; i < get_desc_trans_len(desc); i++) { 2235 set_buffer_dirty(real_blocks[i]); 2236 write_dirty_buffer(real_blocks[i], WRITE); 2237 } 2238 for (i = 0; i < get_desc_trans_len(desc); i++) { 2239 wait_on_buffer(real_blocks[i]); 2240 if (!buffer_uptodate(real_blocks[i])) { 2241 reiserfs_warning(sb, "journal-1226", 2242 "REPLAY FAILURE, fsck required! " 2243 "buffer write failed"); 2244 brelse_array(real_blocks + i, 2245 get_desc_trans_len(desc) - i); 2246 brelse(c_bh); 2247 brelse(d_bh); 2248 kfree(log_blocks); 2249 kfree(real_blocks); 2250 return -1; 2251 } 2252 brelse(real_blocks[i]); 2253 } 2254 cur_dblock = 2255 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2256 ((trans_offset + get_desc_trans_len(desc) + 2257 2) % SB_ONDISK_JOURNAL_SIZE(sb)); 2258 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2259 "journal-1095: setting journal " "start to offset %ld", 2260 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb)); 2261 2262 /* init starting values for the first transaction, in case this is the last transaction to be replayed. */ 2263 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2264 journal->j_last_flush_trans_id = trans_id; 2265 journal->j_trans_id = trans_id + 1; 2266 /* check for trans_id overflow */ 2267 if (journal->j_trans_id == 0) 2268 journal->j_trans_id = 10; 2269 brelse(c_bh); 2270 brelse(d_bh); 2271 kfree(log_blocks); 2272 kfree(real_blocks); 2273 return 0; 2274 } 2275 2276 /* This function reads blocks starting from block and to max_block of bufsize 2277 size (but no more than BUFNR blocks at a time). This proved to improve 2278 mounting speed on self-rebuilding raid5 arrays at least. 2279 Right now it is only used from journal code. But later we might use it 2280 from other places. 2281 Note: Do not use journal_getblk/sb_getblk functions here! */ 2282 static struct buffer_head *reiserfs_breada(struct block_device *dev, 2283 b_blocknr_t block, int bufsize, 2284 b_blocknr_t max_block) 2285 { 2286 struct buffer_head *bhlist[BUFNR]; 2287 unsigned int blocks = BUFNR; 2288 struct buffer_head *bh; 2289 int i, j; 2290 2291 bh = __getblk(dev, block, bufsize); 2292 if (buffer_uptodate(bh)) 2293 return (bh); 2294 2295 if (block + BUFNR > max_block) { 2296 blocks = max_block - block; 2297 } 2298 bhlist[0] = bh; 2299 j = 1; 2300 for (i = 1; i < blocks; i++) { 2301 bh = __getblk(dev, block + i, bufsize); 2302 if (buffer_uptodate(bh)) { 2303 brelse(bh); 2304 break; 2305 } else 2306 bhlist[j++] = bh; 2307 } 2308 ll_rw_block(READ, j, bhlist); 2309 for (i = 1; i < j; i++) 2310 brelse(bhlist[i]); 2311 bh = bhlist[0]; 2312 wait_on_buffer(bh); 2313 if (buffer_uptodate(bh)) 2314 return bh; 2315 brelse(bh); 2316 return NULL; 2317 } 2318 2319 /* 2320 ** read and replay the log 2321 ** on a clean unmount, the journal header's next unflushed pointer will be to an invalid 2322 ** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast. 2323 ** 2324 ** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid. 2325 ** 2326 ** On exit, it sets things up so the first transaction will work correctly. 2327 */ 2328 static int journal_read(struct super_block *sb) 2329 { 2330 struct reiserfs_journal *journal = SB_JOURNAL(sb); 2331 struct reiserfs_journal_desc *desc; 2332 unsigned int oldest_trans_id = 0; 2333 unsigned int oldest_invalid_trans_id = 0; 2334 time_t start; 2335 unsigned long oldest_start = 0; 2336 unsigned long cur_dblock = 0; 2337 unsigned long newest_mount_id = 9; 2338 struct buffer_head *d_bh; 2339 struct reiserfs_journal_header *jh; 2340 int valid_journal_header = 0; 2341 int replay_count = 0; 2342 int continue_replay = 1; 2343 int ret; 2344 char b[BDEVNAME_SIZE]; 2345 2346 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2347 reiserfs_info(sb, "checking transaction log (%s)\n", 2348 bdevname(journal->j_dev_bd, b)); 2349 start = get_seconds(); 2350 2351 /* step 1, read in the journal header block. Check the transaction it says 2352 ** is the first unflushed, and if that transaction is not valid, 2353 ** replay is done 2354 */ 2355 journal->j_header_bh = journal_bread(sb, 2356 SB_ONDISK_JOURNAL_1st_BLOCK(sb) 2357 + SB_ONDISK_JOURNAL_SIZE(sb)); 2358 if (!journal->j_header_bh) { 2359 return 1; 2360 } 2361 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data); 2362 if (le32_to_cpu(jh->j_first_unflushed_offset) < 2363 SB_ONDISK_JOURNAL_SIZE(sb) 2364 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) { 2365 oldest_start = 2366 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2367 le32_to_cpu(jh->j_first_unflushed_offset); 2368 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1; 2369 newest_mount_id = le32_to_cpu(jh->j_mount_id); 2370 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2371 "journal-1153: found in " 2372 "header: first_unflushed_offset %d, last_flushed_trans_id " 2373 "%lu", le32_to_cpu(jh->j_first_unflushed_offset), 2374 le32_to_cpu(jh->j_last_flush_trans_id)); 2375 valid_journal_header = 1; 2376 2377 /* now, we try to read the first unflushed offset. If it is not valid, 2378 ** there is nothing more we can do, and it makes no sense to read 2379 ** through the whole log. 2380 */ 2381 d_bh = 2382 journal_bread(sb, 2383 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2384 le32_to_cpu(jh->j_first_unflushed_offset)); 2385 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL); 2386 if (!ret) { 2387 continue_replay = 0; 2388 } 2389 brelse(d_bh); 2390 goto start_log_replay; 2391 } 2392 2393 /* ok, there are transactions that need to be replayed. start with the first log block, find 2394 ** all the valid transactions, and pick out the oldest. 2395 */ 2396 while (continue_replay 2397 && cur_dblock < 2398 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2399 SB_ONDISK_JOURNAL_SIZE(sb))) { 2400 /* Note that it is required for blocksize of primary fs device and journal 2401 device to be the same */ 2402 d_bh = 2403 reiserfs_breada(journal->j_dev_bd, cur_dblock, 2404 sb->s_blocksize, 2405 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2406 SB_ONDISK_JOURNAL_SIZE(sb)); 2407 ret = 2408 journal_transaction_is_valid(sb, d_bh, 2409 &oldest_invalid_trans_id, 2410 &newest_mount_id); 2411 if (ret == 1) { 2412 desc = (struct reiserfs_journal_desc *)d_bh->b_data; 2413 if (oldest_start == 0) { /* init all oldest_ values */ 2414 oldest_trans_id = get_desc_trans_id(desc); 2415 oldest_start = d_bh->b_blocknr; 2416 newest_mount_id = get_desc_mount_id(desc); 2417 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2418 "journal-1179: Setting " 2419 "oldest_start to offset %llu, trans_id %lu", 2420 oldest_start - 2421 SB_ONDISK_JOURNAL_1st_BLOCK 2422 (sb), oldest_trans_id); 2423 } else if (oldest_trans_id > get_desc_trans_id(desc)) { 2424 /* one we just read was older */ 2425 oldest_trans_id = get_desc_trans_id(desc); 2426 oldest_start = d_bh->b_blocknr; 2427 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2428 "journal-1180: Resetting " 2429 "oldest_start to offset %lu, trans_id %lu", 2430 oldest_start - 2431 SB_ONDISK_JOURNAL_1st_BLOCK 2432 (sb), oldest_trans_id); 2433 } 2434 if (newest_mount_id < get_desc_mount_id(desc)) { 2435 newest_mount_id = get_desc_mount_id(desc); 2436 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2437 "journal-1299: Setting " 2438 "newest_mount_id to %d", 2439 get_desc_mount_id(desc)); 2440 } 2441 cur_dblock += get_desc_trans_len(desc) + 2; 2442 } else { 2443 cur_dblock++; 2444 } 2445 brelse(d_bh); 2446 } 2447 2448 start_log_replay: 2449 cur_dblock = oldest_start; 2450 if (oldest_trans_id) { 2451 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2452 "journal-1206: Starting replay " 2453 "from offset %llu, trans_id %lu", 2454 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2455 oldest_trans_id); 2456 2457 } 2458 replay_count = 0; 2459 while (continue_replay && oldest_trans_id > 0) { 2460 ret = 2461 journal_read_transaction(sb, cur_dblock, oldest_start, 2462 oldest_trans_id, newest_mount_id); 2463 if (ret < 0) { 2464 return ret; 2465 } else if (ret != 0) { 2466 break; 2467 } 2468 cur_dblock = 2469 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start; 2470 replay_count++; 2471 if (cur_dblock == oldest_start) 2472 break; 2473 } 2474 2475 if (oldest_trans_id == 0) { 2476 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2477 "journal-1225: No valid " "transactions found"); 2478 } 2479 /* j_start does not get set correctly if we don't replay any transactions. 2480 ** if we had a valid journal_header, set j_start to the first unflushed transaction value, 2481 ** copy the trans_id from the header 2482 */ 2483 if (valid_journal_header && replay_count == 0) { 2484 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset); 2485 journal->j_trans_id = 2486 le32_to_cpu(jh->j_last_flush_trans_id) + 1; 2487 /* check for trans_id overflow */ 2488 if (journal->j_trans_id == 0) 2489 journal->j_trans_id = 10; 2490 journal->j_last_flush_trans_id = 2491 le32_to_cpu(jh->j_last_flush_trans_id); 2492 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1; 2493 } else { 2494 journal->j_mount_id = newest_mount_id + 1; 2495 } 2496 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " 2497 "newest_mount_id to %lu", journal->j_mount_id); 2498 journal->j_first_unflushed_offset = journal->j_start; 2499 if (replay_count > 0) { 2500 reiserfs_info(sb, 2501 "replayed %d transactions in %lu seconds\n", 2502 replay_count, get_seconds() - start); 2503 } 2504 if (!bdev_read_only(sb->s_bdev) && 2505 _update_journal_header_block(sb, journal->j_start, 2506 journal->j_last_flush_trans_id)) { 2507 /* replay failed, caller must call free_journal_ram and abort 2508 ** the mount 2509 */ 2510 return -1; 2511 } 2512 return 0; 2513 } 2514 2515 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s) 2516 { 2517 struct reiserfs_journal_list *jl; 2518 jl = kzalloc(sizeof(struct reiserfs_journal_list), 2519 GFP_NOFS | __GFP_NOFAIL); 2520 INIT_LIST_HEAD(&jl->j_list); 2521 INIT_LIST_HEAD(&jl->j_working_list); 2522 INIT_LIST_HEAD(&jl->j_tail_bh_list); 2523 INIT_LIST_HEAD(&jl->j_bh_list); 2524 mutex_init(&jl->j_commit_mutex); 2525 SB_JOURNAL(s)->j_num_lists++; 2526 get_journal_list(jl); 2527 return jl; 2528 } 2529 2530 static void journal_list_init(struct super_block *sb) 2531 { 2532 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb); 2533 } 2534 2535 static int release_journal_dev(struct super_block *super, 2536 struct reiserfs_journal *journal) 2537 { 2538 int result; 2539 2540 result = 0; 2541 2542 if (journal->j_dev_bd != NULL) { 2543 result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode); 2544 journal->j_dev_bd = NULL; 2545 } 2546 2547 if (result != 0) { 2548 reiserfs_warning(super, "sh-457", 2549 "Cannot release journal device: %i", result); 2550 } 2551 return result; 2552 } 2553 2554 static int journal_init_dev(struct super_block *super, 2555 struct reiserfs_journal *journal, 2556 const char *jdev_name) 2557 { 2558 int result; 2559 dev_t jdev; 2560 fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL; 2561 char b[BDEVNAME_SIZE]; 2562 2563 result = 0; 2564 2565 journal->j_dev_bd = NULL; 2566 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ? 2567 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev; 2568 2569 if (bdev_read_only(super->s_bdev)) 2570 blkdev_mode = FMODE_READ; 2571 2572 /* there is no "jdev" option and journal is on separate device */ 2573 if ((!jdev_name || !jdev_name[0])) { 2574 if (jdev == super->s_dev) 2575 blkdev_mode &= ~FMODE_EXCL; 2576 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode, 2577 journal); 2578 journal->j_dev_mode = blkdev_mode; 2579 if (IS_ERR(journal->j_dev_bd)) { 2580 result = PTR_ERR(journal->j_dev_bd); 2581 journal->j_dev_bd = NULL; 2582 reiserfs_warning(super, "sh-458", 2583 "cannot init journal device '%s': %i", 2584 __bdevname(jdev, b), result); 2585 return result; 2586 } else if (jdev != super->s_dev) 2587 set_blocksize(journal->j_dev_bd, super->s_blocksize); 2588 2589 return 0; 2590 } 2591 2592 journal->j_dev_mode = blkdev_mode; 2593 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal); 2594 if (IS_ERR(journal->j_dev_bd)) { 2595 result = PTR_ERR(journal->j_dev_bd); 2596 journal->j_dev_bd = NULL; 2597 reiserfs_warning(super, 2598 "journal_init_dev: Cannot open '%s': %i", 2599 jdev_name, result); 2600 return result; 2601 } 2602 2603 set_blocksize(journal->j_dev_bd, super->s_blocksize); 2604 reiserfs_info(super, 2605 "journal_init_dev: journal device: %s\n", 2606 bdevname(journal->j_dev_bd, b)); 2607 return 0; 2608 } 2609 2610 /** 2611 * When creating/tuning a file system user can assign some 2612 * journal params within boundaries which depend on the ratio 2613 * blocksize/standard_blocksize. 2614 * 2615 * For blocks >= standard_blocksize transaction size should 2616 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more 2617 * then JOURNAL_TRANS_MAX_DEFAULT. 2618 * 2619 * For blocks < standard_blocksize these boundaries should be 2620 * decreased proportionally. 2621 */ 2622 #define REISERFS_STANDARD_BLKSIZE (4096) 2623 2624 static int check_advise_trans_params(struct super_block *sb, 2625 struct reiserfs_journal *journal) 2626 { 2627 if (journal->j_trans_max) { 2628 /* Non-default journal params. 2629 Do sanity check for them. */ 2630 int ratio = 1; 2631 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE) 2632 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize; 2633 2634 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio || 2635 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio || 2636 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max < 2637 JOURNAL_MIN_RATIO) { 2638 reiserfs_warning(sb, "sh-462", 2639 "bad transaction max size (%u). " 2640 "FSCK?", journal->j_trans_max); 2641 return 1; 2642 } 2643 if (journal->j_max_batch != (journal->j_trans_max) * 2644 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) { 2645 reiserfs_warning(sb, "sh-463", 2646 "bad transaction max batch (%u). " 2647 "FSCK?", journal->j_max_batch); 2648 return 1; 2649 } 2650 } else { 2651 /* Default journal params. 2652 The file system was created by old version 2653 of mkreiserfs, so some fields contain zeros, 2654 and we need to advise proper values for them */ 2655 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) { 2656 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)", 2657 sb->s_blocksize); 2658 return 1; 2659 } 2660 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT; 2661 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT; 2662 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE; 2663 } 2664 return 0; 2665 } 2666 2667 /* 2668 ** must be called once on fs mount. calls journal_read for you 2669 */ 2670 int journal_init(struct super_block *sb, const char *j_dev_name, 2671 int old_format, unsigned int commit_max_age) 2672 { 2673 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2; 2674 struct buffer_head *bhjh; 2675 struct reiserfs_super_block *rs; 2676 struct reiserfs_journal_header *jh; 2677 struct reiserfs_journal *journal; 2678 struct reiserfs_journal_list *jl; 2679 char b[BDEVNAME_SIZE]; 2680 int ret; 2681 2682 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal)); 2683 if (!journal) { 2684 reiserfs_warning(sb, "journal-1256", 2685 "unable to get memory for journal structure"); 2686 return 1; 2687 } 2688 INIT_LIST_HEAD(&journal->j_bitmap_nodes); 2689 INIT_LIST_HEAD(&journal->j_prealloc_list); 2690 INIT_LIST_HEAD(&journal->j_working_list); 2691 INIT_LIST_HEAD(&journal->j_journal_list); 2692 journal->j_persistent_trans = 0; 2693 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap, 2694 reiserfs_bmap_count(sb))) 2695 goto free_and_return; 2696 2697 allocate_bitmap_nodes(sb); 2698 2699 /* reserved for journal area support */ 2700 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ? 2701 REISERFS_OLD_DISK_OFFSET_IN_BYTES 2702 / sb->s_blocksize + 2703 reiserfs_bmap_count(sb) + 2704 1 : 2705 REISERFS_DISK_OFFSET_IN_BYTES / 2706 sb->s_blocksize + 2); 2707 2708 /* Sanity check to see is the standard journal fitting within first bitmap 2709 (actual for small blocksizes) */ 2710 if (!SB_ONDISK_JOURNAL_DEVICE(sb) && 2711 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) + 2712 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) { 2713 reiserfs_warning(sb, "journal-1393", 2714 "journal does not fit for area addressed " 2715 "by first of bitmap blocks. It starts at " 2716 "%u and its size is %u. Block size %ld", 2717 SB_JOURNAL_1st_RESERVED_BLOCK(sb), 2718 SB_ONDISK_JOURNAL_SIZE(sb), 2719 sb->s_blocksize); 2720 goto free_and_return; 2721 } 2722 2723 if (journal_init_dev(sb, journal, j_dev_name) != 0) { 2724 reiserfs_warning(sb, "sh-462", 2725 "unable to initialize jornal device"); 2726 goto free_and_return; 2727 } 2728 2729 rs = SB_DISK_SUPER_BLOCK(sb); 2730 2731 /* read journal header */ 2732 bhjh = journal_bread(sb, 2733 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2734 SB_ONDISK_JOURNAL_SIZE(sb)); 2735 if (!bhjh) { 2736 reiserfs_warning(sb, "sh-459", 2737 "unable to read journal header"); 2738 goto free_and_return; 2739 } 2740 jh = (struct reiserfs_journal_header *)(bhjh->b_data); 2741 2742 /* make sure that journal matches to the super block */ 2743 if (is_reiserfs_jr(rs) 2744 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) != 2745 sb_jp_journal_magic(rs))) { 2746 reiserfs_warning(sb, "sh-460", 2747 "journal header magic %x (device %s) does " 2748 "not match to magic found in super block %x", 2749 jh->jh_journal.jp_journal_magic, 2750 bdevname(journal->j_dev_bd, b), 2751 sb_jp_journal_magic(rs)); 2752 brelse(bhjh); 2753 goto free_and_return; 2754 } 2755 2756 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max); 2757 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch); 2758 journal->j_max_commit_age = 2759 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age); 2760 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; 2761 2762 if (check_advise_trans_params(sb, journal) != 0) 2763 goto free_and_return; 2764 journal->j_default_max_commit_age = journal->j_max_commit_age; 2765 2766 if (commit_max_age != 0) { 2767 journal->j_max_commit_age = commit_max_age; 2768 journal->j_max_trans_age = commit_max_age; 2769 } 2770 2771 reiserfs_info(sb, "journal params: device %s, size %u, " 2772 "journal first block %u, max trans len %u, max batch %u, " 2773 "max commit age %u, max trans age %u\n", 2774 bdevname(journal->j_dev_bd, b), 2775 SB_ONDISK_JOURNAL_SIZE(sb), 2776 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2777 journal->j_trans_max, 2778 journal->j_max_batch, 2779 journal->j_max_commit_age, journal->j_max_trans_age); 2780 2781 brelse(bhjh); 2782 2783 journal->j_list_bitmap_index = 0; 2784 journal_list_init(sb); 2785 2786 memset(journal->j_list_hash_table, 0, 2787 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); 2788 2789 INIT_LIST_HEAD(&journal->j_dirty_buffers); 2790 spin_lock_init(&journal->j_dirty_buffers_lock); 2791 2792 journal->j_start = 0; 2793 journal->j_len = 0; 2794 journal->j_len_alloc = 0; 2795 atomic_set(&(journal->j_wcount), 0); 2796 atomic_set(&(journal->j_async_throttle), 0); 2797 journal->j_bcount = 0; 2798 journal->j_trans_start_time = 0; 2799 journal->j_last = NULL; 2800 journal->j_first = NULL; 2801 init_waitqueue_head(&(journal->j_join_wait)); 2802 mutex_init(&journal->j_mutex); 2803 mutex_init(&journal->j_flush_mutex); 2804 2805 journal->j_trans_id = 10; 2806 journal->j_mount_id = 10; 2807 journal->j_state = 0; 2808 atomic_set(&(journal->j_jlock), 0); 2809 journal->j_cnode_free_list = allocate_cnodes(num_cnodes); 2810 journal->j_cnode_free_orig = journal->j_cnode_free_list; 2811 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0; 2812 journal->j_cnode_used = 0; 2813 journal->j_must_wait = 0; 2814 2815 if (journal->j_cnode_free == 0) { 2816 reiserfs_warning(sb, "journal-2004", "Journal cnode memory " 2817 "allocation failed (%ld bytes). Journal is " 2818 "too large for available memory. Usually " 2819 "this is due to a journal that is too large.", 2820 sizeof (struct reiserfs_journal_cnode) * num_cnodes); 2821 goto free_and_return; 2822 } 2823 2824 init_journal_hash(sb); 2825 jl = journal->j_current_jl; 2826 2827 /* 2828 * get_list_bitmap() may call flush_commit_list() which 2829 * requires the lock. Calling flush_commit_list() shouldn't happen 2830 * this early but I like to be paranoid. 2831 */ 2832 reiserfs_write_lock(sb); 2833 jl->j_list_bitmap = get_list_bitmap(sb, jl); 2834 reiserfs_write_unlock(sb); 2835 if (!jl->j_list_bitmap) { 2836 reiserfs_warning(sb, "journal-2005", 2837 "get_list_bitmap failed for journal list 0"); 2838 goto free_and_return; 2839 } 2840 2841 /* 2842 * Journal_read needs to be inspected in order to push down 2843 * the lock further inside (or even remove it). 2844 */ 2845 reiserfs_write_lock(sb); 2846 ret = journal_read(sb); 2847 reiserfs_write_unlock(sb); 2848 if (ret < 0) { 2849 reiserfs_warning(sb, "reiserfs-2006", 2850 "Replay Failure, unable to mount"); 2851 goto free_and_return; 2852 } 2853 2854 reiserfs_mounted_fs_count++; 2855 if (reiserfs_mounted_fs_count <= 1) 2856 commit_wq = alloc_workqueue("reiserfs", WQ_MEM_RECLAIM, 0); 2857 2858 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits); 2859 journal->j_work_sb = sb; 2860 return 0; 2861 free_and_return: 2862 free_journal_ram(sb); 2863 return 1; 2864 } 2865 2866 /* 2867 ** test for a polite end of the current transaction. Used by file_write, and should 2868 ** be used by delete to make sure they don't write more than can fit inside a single 2869 ** transaction 2870 */ 2871 int journal_transaction_should_end(struct reiserfs_transaction_handle *th, 2872 int new_alloc) 2873 { 2874 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); 2875 time_t now = get_seconds(); 2876 /* cannot restart while nested */ 2877 BUG_ON(!th->t_trans_id); 2878 if (th->t_refcount > 1) 2879 return 0; 2880 if (journal->j_must_wait > 0 || 2881 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch || 2882 atomic_read(&(journal->j_jlock)) || 2883 (now - journal->j_trans_start_time) > journal->j_max_trans_age || 2884 journal->j_cnode_free < (journal->j_trans_max * 3)) { 2885 return 1; 2886 } 2887 2888 journal->j_len_alloc += new_alloc; 2889 th->t_blocks_allocated += new_alloc ; 2890 return 0; 2891 } 2892 2893 /* this must be called inside a transaction 2894 */ 2895 void reiserfs_block_writes(struct reiserfs_transaction_handle *th) 2896 { 2897 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); 2898 BUG_ON(!th->t_trans_id); 2899 journal->j_must_wait = 1; 2900 set_bit(J_WRITERS_BLOCKED, &journal->j_state); 2901 return; 2902 } 2903 2904 /* this must be called without a transaction started 2905 */ 2906 void reiserfs_allow_writes(struct super_block *s) 2907 { 2908 struct reiserfs_journal *journal = SB_JOURNAL(s); 2909 clear_bit(J_WRITERS_BLOCKED, &journal->j_state); 2910 wake_up(&journal->j_join_wait); 2911 } 2912 2913 /* this must be called without a transaction started 2914 */ 2915 void reiserfs_wait_on_write_block(struct super_block *s) 2916 { 2917 struct reiserfs_journal *journal = SB_JOURNAL(s); 2918 wait_event(journal->j_join_wait, 2919 !test_bit(J_WRITERS_BLOCKED, &journal->j_state)); 2920 } 2921 2922 static void queue_log_writer(struct super_block *s) 2923 { 2924 wait_queue_t wait; 2925 struct reiserfs_journal *journal = SB_JOURNAL(s); 2926 set_bit(J_WRITERS_QUEUED, &journal->j_state); 2927 2928 /* 2929 * we don't want to use wait_event here because 2930 * we only want to wait once. 2931 */ 2932 init_waitqueue_entry(&wait, current); 2933 add_wait_queue(&journal->j_join_wait, &wait); 2934 set_current_state(TASK_UNINTERRUPTIBLE); 2935 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) { 2936 reiserfs_write_unlock(s); 2937 schedule(); 2938 reiserfs_write_lock(s); 2939 } 2940 __set_current_state(TASK_RUNNING); 2941 remove_wait_queue(&journal->j_join_wait, &wait); 2942 } 2943 2944 static void wake_queued_writers(struct super_block *s) 2945 { 2946 struct reiserfs_journal *journal = SB_JOURNAL(s); 2947 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state)) 2948 wake_up(&journal->j_join_wait); 2949 } 2950 2951 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id) 2952 { 2953 struct reiserfs_journal *journal = SB_JOURNAL(sb); 2954 unsigned long bcount = journal->j_bcount; 2955 while (1) { 2956 reiserfs_write_unlock(sb); 2957 schedule_timeout_uninterruptible(1); 2958 reiserfs_write_lock(sb); 2959 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING; 2960 while ((atomic_read(&journal->j_wcount) > 0 || 2961 atomic_read(&journal->j_jlock)) && 2962 journal->j_trans_id == trans_id) { 2963 queue_log_writer(sb); 2964 } 2965 if (journal->j_trans_id != trans_id) 2966 break; 2967 if (bcount == journal->j_bcount) 2968 break; 2969 bcount = journal->j_bcount; 2970 } 2971 } 2972 2973 /* join == true if you must join an existing transaction. 2974 ** join == false if you can deal with waiting for others to finish 2975 ** 2976 ** this will block until the transaction is joinable. send the number of blocks you 2977 ** expect to use in nblocks. 2978 */ 2979 static int do_journal_begin_r(struct reiserfs_transaction_handle *th, 2980 struct super_block *sb, unsigned long nblocks, 2981 int join) 2982 { 2983 time_t now = get_seconds(); 2984 unsigned int old_trans_id; 2985 struct reiserfs_journal *journal = SB_JOURNAL(sb); 2986 struct reiserfs_transaction_handle myth; 2987 int sched_count = 0; 2988 int retval; 2989 2990 reiserfs_check_lock_depth(sb, "journal_begin"); 2991 BUG_ON(nblocks > journal->j_trans_max); 2992 2993 PROC_INFO_INC(sb, journal.journal_being); 2994 /* set here for journal_join */ 2995 th->t_refcount = 1; 2996 th->t_super = sb; 2997 2998 relock: 2999 lock_journal(sb); 3000 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) { 3001 unlock_journal(sb); 3002 retval = journal->j_errno; 3003 goto out_fail; 3004 } 3005 journal->j_bcount++; 3006 3007 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) { 3008 unlock_journal(sb); 3009 reiserfs_write_unlock(sb); 3010 reiserfs_wait_on_write_block(sb); 3011 reiserfs_write_lock(sb); 3012 PROC_INFO_INC(sb, journal.journal_relock_writers); 3013 goto relock; 3014 } 3015 now = get_seconds(); 3016 3017 /* if there is no room in the journal OR 3018 ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning 3019 ** we don't sleep if there aren't other writers 3020 */ 3021 3022 if ((!join && journal->j_must_wait > 0) || 3023 (!join 3024 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch) 3025 || (!join && atomic_read(&journal->j_wcount) > 0 3026 && journal->j_trans_start_time > 0 3027 && (now - journal->j_trans_start_time) > 3028 journal->j_max_trans_age) || (!join 3029 && atomic_read(&journal->j_jlock)) 3030 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) { 3031 3032 old_trans_id = journal->j_trans_id; 3033 unlock_journal(sb); /* allow others to finish this transaction */ 3034 3035 if (!join && (journal->j_len_alloc + nblocks + 2) >= 3036 journal->j_max_batch && 3037 ((journal->j_len + nblocks + 2) * 100) < 3038 (journal->j_len_alloc * 75)) { 3039 if (atomic_read(&journal->j_wcount) > 10) { 3040 sched_count++; 3041 queue_log_writer(sb); 3042 goto relock; 3043 } 3044 } 3045 /* don't mess with joining the transaction if all we have to do is 3046 * wait for someone else to do a commit 3047 */ 3048 if (atomic_read(&journal->j_jlock)) { 3049 while (journal->j_trans_id == old_trans_id && 3050 atomic_read(&journal->j_jlock)) { 3051 queue_log_writer(sb); 3052 } 3053 goto relock; 3054 } 3055 retval = journal_join(&myth, sb, 1); 3056 if (retval) 3057 goto out_fail; 3058 3059 /* someone might have ended the transaction while we joined */ 3060 if (old_trans_id != journal->j_trans_id) { 3061 retval = do_journal_end(&myth, sb, 1, 0); 3062 } else { 3063 retval = do_journal_end(&myth, sb, 1, COMMIT_NOW); 3064 } 3065 3066 if (retval) 3067 goto out_fail; 3068 3069 PROC_INFO_INC(sb, journal.journal_relock_wcount); 3070 goto relock; 3071 } 3072 /* we are the first writer, set trans_id */ 3073 if (journal->j_trans_start_time == 0) { 3074 journal->j_trans_start_time = get_seconds(); 3075 } 3076 atomic_inc(&(journal->j_wcount)); 3077 journal->j_len_alloc += nblocks; 3078 th->t_blocks_logged = 0; 3079 th->t_blocks_allocated = nblocks; 3080 th->t_trans_id = journal->j_trans_id; 3081 unlock_journal(sb); 3082 INIT_LIST_HEAD(&th->t_list); 3083 return 0; 3084 3085 out_fail: 3086 memset(th, 0, sizeof(*th)); 3087 /* Re-set th->t_super, so we can properly keep track of how many 3088 * persistent transactions there are. We need to do this so if this 3089 * call is part of a failed restart_transaction, we can free it later */ 3090 th->t_super = sb; 3091 return retval; 3092 } 3093 3094 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct 3095 super_block 3096 *s, 3097 int nblocks) 3098 { 3099 int ret; 3100 struct reiserfs_transaction_handle *th; 3101 3102 /* if we're nesting into an existing transaction. It will be 3103 ** persistent on its own 3104 */ 3105 if (reiserfs_transaction_running(s)) { 3106 th = current->journal_info; 3107 th->t_refcount++; 3108 BUG_ON(th->t_refcount < 2); 3109 3110 return th; 3111 } 3112 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS); 3113 if (!th) 3114 return NULL; 3115 ret = journal_begin(th, s, nblocks); 3116 if (ret) { 3117 kfree(th); 3118 return NULL; 3119 } 3120 3121 SB_JOURNAL(s)->j_persistent_trans++; 3122 return th; 3123 } 3124 3125 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th) 3126 { 3127 struct super_block *s = th->t_super; 3128 int ret = 0; 3129 if (th->t_trans_id) 3130 ret = journal_end(th, th->t_super, th->t_blocks_allocated); 3131 else 3132 ret = -EIO; 3133 if (th->t_refcount == 0) { 3134 SB_JOURNAL(s)->j_persistent_trans--; 3135 kfree(th); 3136 } 3137 return ret; 3138 } 3139 3140 static int journal_join(struct reiserfs_transaction_handle *th, 3141 struct super_block *sb, unsigned long nblocks) 3142 { 3143 struct reiserfs_transaction_handle *cur_th = current->journal_info; 3144 3145 /* this keeps do_journal_end from NULLing out the current->journal_info 3146 ** pointer 3147 */ 3148 th->t_handle_save = cur_th; 3149 BUG_ON(cur_th && cur_th->t_refcount > 1); 3150 return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN); 3151 } 3152 3153 int journal_join_abort(struct reiserfs_transaction_handle *th, 3154 struct super_block *sb, unsigned long nblocks) 3155 { 3156 struct reiserfs_transaction_handle *cur_th = current->journal_info; 3157 3158 /* this keeps do_journal_end from NULLing out the current->journal_info 3159 ** pointer 3160 */ 3161 th->t_handle_save = cur_th; 3162 BUG_ON(cur_th && cur_th->t_refcount > 1); 3163 return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT); 3164 } 3165 3166 int journal_begin(struct reiserfs_transaction_handle *th, 3167 struct super_block *sb, unsigned long nblocks) 3168 { 3169 struct reiserfs_transaction_handle *cur_th = current->journal_info; 3170 int ret; 3171 3172 th->t_handle_save = NULL; 3173 if (cur_th) { 3174 /* we are nesting into the current transaction */ 3175 if (cur_th->t_super == sb) { 3176 BUG_ON(!cur_th->t_refcount); 3177 cur_th->t_refcount++; 3178 memcpy(th, cur_th, sizeof(*th)); 3179 if (th->t_refcount <= 1) 3180 reiserfs_warning(sb, "reiserfs-2005", 3181 "BAD: refcount <= 1, but " 3182 "journal_info != 0"); 3183 return 0; 3184 } else { 3185 /* we've ended up with a handle from a different filesystem. 3186 ** save it and restore on journal_end. This should never 3187 ** really happen... 3188 */ 3189 reiserfs_warning(sb, "clm-2100", 3190 "nesting info a different FS"); 3191 th->t_handle_save = current->journal_info; 3192 current->journal_info = th; 3193 } 3194 } else { 3195 current->journal_info = th; 3196 } 3197 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG); 3198 BUG_ON(current->journal_info != th); 3199 3200 /* I guess this boils down to being the reciprocal of clm-2100 above. 3201 * If do_journal_begin_r fails, we need to put it back, since journal_end 3202 * won't be called to do it. */ 3203 if (ret) 3204 current->journal_info = th->t_handle_save; 3205 else 3206 BUG_ON(!th->t_refcount); 3207 3208 return ret; 3209 } 3210 3211 /* 3212 ** puts bh into the current transaction. If it was already there, reorders removes the 3213 ** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order). 3214 ** 3215 ** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the 3216 ** transaction is committed. 3217 ** 3218 ** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. 3219 */ 3220 int journal_mark_dirty(struct reiserfs_transaction_handle *th, 3221 struct super_block *sb, struct buffer_head *bh) 3222 { 3223 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3224 struct reiserfs_journal_cnode *cn = NULL; 3225 int count_already_incd = 0; 3226 int prepared = 0; 3227 BUG_ON(!th->t_trans_id); 3228 3229 PROC_INFO_INC(sb, journal.mark_dirty); 3230 if (th->t_trans_id != journal->j_trans_id) { 3231 reiserfs_panic(th->t_super, "journal-1577", 3232 "handle trans id %ld != current trans id %ld", 3233 th->t_trans_id, journal->j_trans_id); 3234 } 3235 3236 prepared = test_clear_buffer_journal_prepared(bh); 3237 clear_buffer_journal_restore_dirty(bh); 3238 /* already in this transaction, we are done */ 3239 if (buffer_journaled(bh)) { 3240 PROC_INFO_INC(sb, journal.mark_dirty_already); 3241 return 0; 3242 } 3243 3244 /* this must be turned into a panic instead of a warning. We can't allow 3245 ** a dirty or journal_dirty or locked buffer to be logged, as some changes 3246 ** could get to disk too early. NOT GOOD. 3247 */ 3248 if (!prepared || buffer_dirty(bh)) { 3249 reiserfs_warning(sb, "journal-1777", 3250 "buffer %llu bad state " 3251 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT", 3252 (unsigned long long)bh->b_blocknr, 3253 prepared ? ' ' : '!', 3254 buffer_locked(bh) ? ' ' : '!', 3255 buffer_dirty(bh) ? ' ' : '!', 3256 buffer_journal_dirty(bh) ? ' ' : '!'); 3257 } 3258 3259 if (atomic_read(&(journal->j_wcount)) <= 0) { 3260 reiserfs_warning(sb, "journal-1409", 3261 "returning because j_wcount was %d", 3262 atomic_read(&(journal->j_wcount))); 3263 return 1; 3264 } 3265 /* this error means I've screwed up, and we've overflowed the transaction. 3266 ** Nothing can be done here, except make the FS readonly or panic. 3267 */ 3268 if (journal->j_len >= journal->j_trans_max) { 3269 reiserfs_panic(th->t_super, "journal-1413", 3270 "j_len (%lu) is too big", 3271 journal->j_len); 3272 } 3273 3274 if (buffer_journal_dirty(bh)) { 3275 count_already_incd = 1; 3276 PROC_INFO_INC(sb, journal.mark_dirty_notjournal); 3277 clear_buffer_journal_dirty(bh); 3278 } 3279 3280 if (journal->j_len > journal->j_len_alloc) { 3281 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT; 3282 } 3283 3284 set_buffer_journaled(bh); 3285 3286 /* now put this guy on the end */ 3287 if (!cn) { 3288 cn = get_cnode(sb); 3289 if (!cn) { 3290 reiserfs_panic(sb, "journal-4", "get_cnode failed!"); 3291 } 3292 3293 if (th->t_blocks_logged == th->t_blocks_allocated) { 3294 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT; 3295 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT; 3296 } 3297 th->t_blocks_logged++; 3298 journal->j_len++; 3299 3300 cn->bh = bh; 3301 cn->blocknr = bh->b_blocknr; 3302 cn->sb = sb; 3303 cn->jlist = NULL; 3304 insert_journal_hash(journal->j_hash_table, cn); 3305 if (!count_already_incd) { 3306 get_bh(bh); 3307 } 3308 } 3309 cn->next = NULL; 3310 cn->prev = journal->j_last; 3311 cn->bh = bh; 3312 if (journal->j_last) { 3313 journal->j_last->next = cn; 3314 journal->j_last = cn; 3315 } else { 3316 journal->j_first = cn; 3317 journal->j_last = cn; 3318 } 3319 reiserfs_schedule_old_flush(sb); 3320 return 0; 3321 } 3322 3323 int journal_end(struct reiserfs_transaction_handle *th, 3324 struct super_block *sb, unsigned long nblocks) 3325 { 3326 if (!current->journal_info && th->t_refcount > 1) 3327 reiserfs_warning(sb, "REISER-NESTING", 3328 "th NULL, refcount %d", th->t_refcount); 3329 3330 if (!th->t_trans_id) { 3331 WARN_ON(1); 3332 return -EIO; 3333 } 3334 3335 th->t_refcount--; 3336 if (th->t_refcount > 0) { 3337 struct reiserfs_transaction_handle *cur_th = 3338 current->journal_info; 3339 3340 /* we aren't allowed to close a nested transaction on a different 3341 ** filesystem from the one in the task struct 3342 */ 3343 BUG_ON(cur_th->t_super != th->t_super); 3344 3345 if (th != cur_th) { 3346 memcpy(current->journal_info, th, sizeof(*th)); 3347 th->t_trans_id = 0; 3348 } 3349 return 0; 3350 } else { 3351 return do_journal_end(th, sb, nblocks, 0); 3352 } 3353 } 3354 3355 /* removes from the current transaction, relsing and descrementing any counters. 3356 ** also files the removed buffer directly onto the clean list 3357 ** 3358 ** called by journal_mark_freed when a block has been deleted 3359 ** 3360 ** returns 1 if it cleaned and relsed the buffer. 0 otherwise 3361 */ 3362 static int remove_from_transaction(struct super_block *sb, 3363 b_blocknr_t blocknr, int already_cleaned) 3364 { 3365 struct buffer_head *bh; 3366 struct reiserfs_journal_cnode *cn; 3367 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3368 int ret = 0; 3369 3370 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); 3371 if (!cn || !cn->bh) { 3372 return ret; 3373 } 3374 bh = cn->bh; 3375 if (cn->prev) { 3376 cn->prev->next = cn->next; 3377 } 3378 if (cn->next) { 3379 cn->next->prev = cn->prev; 3380 } 3381 if (cn == journal->j_first) { 3382 journal->j_first = cn->next; 3383 } 3384 if (cn == journal->j_last) { 3385 journal->j_last = cn->prev; 3386 } 3387 if (bh) 3388 remove_journal_hash(sb, journal->j_hash_table, NULL, 3389 bh->b_blocknr, 0); 3390 clear_buffer_journaled(bh); /* don't log this one */ 3391 3392 if (!already_cleaned) { 3393 clear_buffer_journal_dirty(bh); 3394 clear_buffer_dirty(bh); 3395 clear_buffer_journal_test(bh); 3396 put_bh(bh); 3397 if (atomic_read(&(bh->b_count)) < 0) { 3398 reiserfs_warning(sb, "journal-1752", 3399 "b_count < 0"); 3400 } 3401 ret = 1; 3402 } 3403 journal->j_len--; 3404 journal->j_len_alloc--; 3405 free_cnode(sb, cn); 3406 return ret; 3407 } 3408 3409 /* 3410 ** for any cnode in a journal list, it can only be dirtied of all the 3411 ** transactions that include it are committed to disk. 3412 ** this checks through each transaction, and returns 1 if you are allowed to dirty, 3413 ** and 0 if you aren't 3414 ** 3415 ** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log 3416 ** blocks for a given transaction on disk 3417 ** 3418 */ 3419 static int can_dirty(struct reiserfs_journal_cnode *cn) 3420 { 3421 struct super_block *sb = cn->sb; 3422 b_blocknr_t blocknr = cn->blocknr; 3423 struct reiserfs_journal_cnode *cur = cn->hprev; 3424 int can_dirty = 1; 3425 3426 /* first test hprev. These are all newer than cn, so any node here 3427 ** with the same block number and dev means this node can't be sent 3428 ** to disk right now. 3429 */ 3430 while (cur && can_dirty) { 3431 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb && 3432 cur->blocknr == blocknr) { 3433 can_dirty = 0; 3434 } 3435 cur = cur->hprev; 3436 } 3437 /* then test hnext. These are all older than cn. As long as they 3438 ** are committed to the log, it is safe to write cn to disk 3439 */ 3440 cur = cn->hnext; 3441 while (cur && can_dirty) { 3442 if (cur->jlist && cur->jlist->j_len > 0 && 3443 atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh && 3444 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) { 3445 can_dirty = 0; 3446 } 3447 cur = cur->hnext; 3448 } 3449 return can_dirty; 3450 } 3451 3452 /* syncs the commit blocks, but does not force the real buffers to disk 3453 ** will wait until the current transaction is done/committed before returning 3454 */ 3455 int journal_end_sync(struct reiserfs_transaction_handle *th, 3456 struct super_block *sb, unsigned long nblocks) 3457 { 3458 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3459 3460 BUG_ON(!th->t_trans_id); 3461 /* you can sync while nested, very, very bad */ 3462 BUG_ON(th->t_refcount > 1); 3463 if (journal->j_len == 0) { 3464 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 3465 1); 3466 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb)); 3467 } 3468 return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT); 3469 } 3470 3471 /* 3472 ** writeback the pending async commits to disk 3473 */ 3474 static void flush_async_commits(struct work_struct *work) 3475 { 3476 struct reiserfs_journal *journal = 3477 container_of(work, struct reiserfs_journal, j_work.work); 3478 struct super_block *sb = journal->j_work_sb; 3479 struct reiserfs_journal_list *jl; 3480 struct list_head *entry; 3481 3482 reiserfs_write_lock(sb); 3483 if (!list_empty(&journal->j_journal_list)) { 3484 /* last entry is the youngest, commit it and you get everything */ 3485 entry = journal->j_journal_list.prev; 3486 jl = JOURNAL_LIST_ENTRY(entry); 3487 flush_commit_list(sb, jl, 1); 3488 } 3489 reiserfs_write_unlock(sb); 3490 } 3491 3492 /* 3493 ** flushes any old transactions to disk 3494 ** ends the current transaction if it is too old 3495 */ 3496 void reiserfs_flush_old_commits(struct super_block *sb) 3497 { 3498 time_t now; 3499 struct reiserfs_transaction_handle th; 3500 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3501 3502 now = get_seconds(); 3503 /* safety check so we don't flush while we are replaying the log during 3504 * mount 3505 */ 3506 if (list_empty(&journal->j_journal_list)) 3507 return; 3508 3509 /* check the current transaction. If there are no writers, and it is 3510 * too old, finish it, and force the commit blocks to disk 3511 */ 3512 if (atomic_read(&journal->j_wcount) <= 0 && 3513 journal->j_trans_start_time > 0 && 3514 journal->j_len > 0 && 3515 (now - journal->j_trans_start_time) > journal->j_max_trans_age) { 3516 if (!journal_join(&th, sb, 1)) { 3517 reiserfs_prepare_for_journal(sb, 3518 SB_BUFFER_WITH_SB(sb), 3519 1); 3520 journal_mark_dirty(&th, sb, 3521 SB_BUFFER_WITH_SB(sb)); 3522 3523 /* we're only being called from kreiserfsd, it makes no sense to do 3524 ** an async commit so that kreiserfsd can do it later 3525 */ 3526 do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT); 3527 } 3528 } 3529 } 3530 3531 /* 3532 ** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit 3533 ** 3534 ** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all 3535 ** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just 3536 ** flushes the commit list and returns 0. 3537 ** 3538 ** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait. 3539 ** 3540 ** Note, we can't allow the journal_end to proceed while there are still writers in the log. 3541 */ 3542 static int check_journal_end(struct reiserfs_transaction_handle *th, 3543 struct super_block *sb, unsigned long nblocks, 3544 int flags) 3545 { 3546 3547 time_t now; 3548 int flush = flags & FLUSH_ALL; 3549 int commit_now = flags & COMMIT_NOW; 3550 int wait_on_commit = flags & WAIT; 3551 struct reiserfs_journal_list *jl; 3552 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3553 3554 BUG_ON(!th->t_trans_id); 3555 3556 if (th->t_trans_id != journal->j_trans_id) { 3557 reiserfs_panic(th->t_super, "journal-1577", 3558 "handle trans id %ld != current trans id %ld", 3559 th->t_trans_id, journal->j_trans_id); 3560 } 3561 3562 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged); 3563 if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */ 3564 atomic_dec(&(journal->j_wcount)); 3565 } 3566 3567 /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released 3568 ** will be dealt with by next transaction that actually writes something, but should be taken 3569 ** care of in this trans 3570 */ 3571 BUG_ON(journal->j_len == 0); 3572 3573 /* if wcount > 0, and we are called to with flush or commit_now, 3574 ** we wait on j_join_wait. We will wake up when the last writer has 3575 ** finished the transaction, and started it on its way to the disk. 3576 ** Then, we flush the commit or journal list, and just return 0 3577 ** because the rest of journal end was already done for this transaction. 3578 */ 3579 if (atomic_read(&(journal->j_wcount)) > 0) { 3580 if (flush || commit_now) { 3581 unsigned trans_id; 3582 3583 jl = journal->j_current_jl; 3584 trans_id = jl->j_trans_id; 3585 if (wait_on_commit) 3586 jl->j_state |= LIST_COMMIT_PENDING; 3587 atomic_set(&(journal->j_jlock), 1); 3588 if (flush) { 3589 journal->j_next_full_flush = 1; 3590 } 3591 unlock_journal(sb); 3592 3593 /* sleep while the current transaction is still j_jlocked */ 3594 while (journal->j_trans_id == trans_id) { 3595 if (atomic_read(&journal->j_jlock)) { 3596 queue_log_writer(sb); 3597 } else { 3598 lock_journal(sb); 3599 if (journal->j_trans_id == trans_id) { 3600 atomic_set(&(journal->j_jlock), 3601 1); 3602 } 3603 unlock_journal(sb); 3604 } 3605 } 3606 BUG_ON(journal->j_trans_id == trans_id); 3607 3608 if (commit_now 3609 && journal_list_still_alive(sb, trans_id) 3610 && wait_on_commit) { 3611 flush_commit_list(sb, jl, 1); 3612 } 3613 return 0; 3614 } 3615 unlock_journal(sb); 3616 return 0; 3617 } 3618 3619 /* deal with old transactions where we are the last writers */ 3620 now = get_seconds(); 3621 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) { 3622 commit_now = 1; 3623 journal->j_next_async_flush = 1; 3624 } 3625 /* don't batch when someone is waiting on j_join_wait */ 3626 /* don't batch when syncing the commit or flushing the whole trans */ 3627 if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock))) 3628 && !flush && !commit_now && (journal->j_len < journal->j_max_batch) 3629 && journal->j_len_alloc < journal->j_max_batch 3630 && journal->j_cnode_free > (journal->j_trans_max * 3)) { 3631 journal->j_bcount++; 3632 unlock_journal(sb); 3633 return 0; 3634 } 3635 3636 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) { 3637 reiserfs_panic(sb, "journal-003", 3638 "j_start (%ld) is too high", 3639 journal->j_start); 3640 } 3641 return 1; 3642 } 3643 3644 /* 3645 ** Does all the work that makes deleting blocks safe. 3646 ** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on. 3647 ** 3648 ** otherwise: 3649 ** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes 3650 ** before this transaction has finished. 3651 ** 3652 ** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with 3653 ** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash, 3654 ** the block can't be reallocated yet. 3655 ** 3656 ** Then remove it from the current transaction, decrementing any counters and filing it on the clean list. 3657 */ 3658 int journal_mark_freed(struct reiserfs_transaction_handle *th, 3659 struct super_block *sb, b_blocknr_t blocknr) 3660 { 3661 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3662 struct reiserfs_journal_cnode *cn = NULL; 3663 struct buffer_head *bh = NULL; 3664 struct reiserfs_list_bitmap *jb = NULL; 3665 int cleaned = 0; 3666 BUG_ON(!th->t_trans_id); 3667 3668 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); 3669 if (cn && cn->bh) { 3670 bh = cn->bh; 3671 get_bh(bh); 3672 } 3673 /* if it is journal new, we just remove it from this transaction */ 3674 if (bh && buffer_journal_new(bh)) { 3675 clear_buffer_journal_new(bh); 3676 clear_prepared_bits(bh); 3677 reiserfs_clean_and_file_buffer(bh); 3678 cleaned = remove_from_transaction(sb, blocknr, cleaned); 3679 } else { 3680 /* set the bit for this block in the journal bitmap for this transaction */ 3681 jb = journal->j_current_jl->j_list_bitmap; 3682 if (!jb) { 3683 reiserfs_panic(sb, "journal-1702", 3684 "journal_list_bitmap is NULL"); 3685 } 3686 set_bit_in_list_bitmap(sb, blocknr, jb); 3687 3688 /* Note, the entire while loop is not allowed to schedule. */ 3689 3690 if (bh) { 3691 clear_prepared_bits(bh); 3692 reiserfs_clean_and_file_buffer(bh); 3693 } 3694 cleaned = remove_from_transaction(sb, blocknr, cleaned); 3695 3696 /* find all older transactions with this block, make sure they don't try to write it out */ 3697 cn = get_journal_hash_dev(sb, journal->j_list_hash_table, 3698 blocknr); 3699 while (cn) { 3700 if (sb == cn->sb && blocknr == cn->blocknr) { 3701 set_bit(BLOCK_FREED, &cn->state); 3702 if (cn->bh) { 3703 if (!cleaned) { 3704 /* remove_from_transaction will brelse the buffer if it was 3705 ** in the current trans 3706 */ 3707 clear_buffer_journal_dirty(cn-> 3708 bh); 3709 clear_buffer_dirty(cn->bh); 3710 clear_buffer_journal_test(cn-> 3711 bh); 3712 cleaned = 1; 3713 put_bh(cn->bh); 3714 if (atomic_read 3715 (&(cn->bh->b_count)) < 0) { 3716 reiserfs_warning(sb, 3717 "journal-2138", 3718 "cn->bh->b_count < 0"); 3719 } 3720 } 3721 if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */ 3722 atomic_dec(& 3723 (cn->jlist-> 3724 j_nonzerolen)); 3725 } 3726 cn->bh = NULL; 3727 } 3728 } 3729 cn = cn->hnext; 3730 } 3731 } 3732 3733 if (bh) 3734 release_buffer_page(bh); /* get_hash grabs the buffer */ 3735 return 0; 3736 } 3737 3738 void reiserfs_update_inode_transaction(struct inode *inode) 3739 { 3740 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb); 3741 REISERFS_I(inode)->i_jl = journal->j_current_jl; 3742 REISERFS_I(inode)->i_trans_id = journal->j_trans_id; 3743 } 3744 3745 /* 3746 * returns -1 on error, 0 if no commits/barriers were done and 1 3747 * if a transaction was actually committed and the barrier was done 3748 */ 3749 static int __commit_trans_jl(struct inode *inode, unsigned long id, 3750 struct reiserfs_journal_list *jl) 3751 { 3752 struct reiserfs_transaction_handle th; 3753 struct super_block *sb = inode->i_sb; 3754 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3755 int ret = 0; 3756 3757 /* is it from the current transaction, or from an unknown transaction? */ 3758 if (id == journal->j_trans_id) { 3759 jl = journal->j_current_jl; 3760 /* try to let other writers come in and grow this transaction */ 3761 let_transaction_grow(sb, id); 3762 if (journal->j_trans_id != id) { 3763 goto flush_commit_only; 3764 } 3765 3766 ret = journal_begin(&th, sb, 1); 3767 if (ret) 3768 return ret; 3769 3770 /* someone might have ended this transaction while we joined */ 3771 if (journal->j_trans_id != id) { 3772 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 3773 1); 3774 journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb)); 3775 ret = journal_end(&th, sb, 1); 3776 goto flush_commit_only; 3777 } 3778 3779 ret = journal_end_sync(&th, sb, 1); 3780 if (!ret) 3781 ret = 1; 3782 3783 } else { 3784 /* this gets tricky, we have to make sure the journal list in 3785 * the inode still exists. We know the list is still around 3786 * if we've got a larger transaction id than the oldest list 3787 */ 3788 flush_commit_only: 3789 if (journal_list_still_alive(inode->i_sb, id)) { 3790 /* 3791 * we only set ret to 1 when we know for sure 3792 * the barrier hasn't been started yet on the commit 3793 * block. 3794 */ 3795 if (atomic_read(&jl->j_commit_left) > 1) 3796 ret = 1; 3797 flush_commit_list(sb, jl, 1); 3798 if (journal->j_errno) 3799 ret = journal->j_errno; 3800 } 3801 } 3802 /* otherwise the list is gone, and long since committed */ 3803 return ret; 3804 } 3805 3806 int reiserfs_commit_for_inode(struct inode *inode) 3807 { 3808 unsigned int id = REISERFS_I(inode)->i_trans_id; 3809 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl; 3810 3811 /* for the whole inode, assume unset id means it was 3812 * changed in the current transaction. More conservative 3813 */ 3814 if (!id || !jl) { 3815 reiserfs_update_inode_transaction(inode); 3816 id = REISERFS_I(inode)->i_trans_id; 3817 /* jl will be updated in __commit_trans_jl */ 3818 } 3819 3820 return __commit_trans_jl(inode, id, jl); 3821 } 3822 3823 void reiserfs_restore_prepared_buffer(struct super_block *sb, 3824 struct buffer_head *bh) 3825 { 3826 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3827 PROC_INFO_INC(sb, journal.restore_prepared); 3828 if (!bh) { 3829 return; 3830 } 3831 if (test_clear_buffer_journal_restore_dirty(bh) && 3832 buffer_journal_dirty(bh)) { 3833 struct reiserfs_journal_cnode *cn; 3834 cn = get_journal_hash_dev(sb, 3835 journal->j_list_hash_table, 3836 bh->b_blocknr); 3837 if (cn && can_dirty(cn)) { 3838 set_buffer_journal_test(bh); 3839 mark_buffer_dirty(bh); 3840 } 3841 } 3842 clear_buffer_journal_prepared(bh); 3843 } 3844 3845 extern struct tree_balance *cur_tb; 3846 /* 3847 ** before we can change a metadata block, we have to make sure it won't 3848 ** be written to disk while we are altering it. So, we must: 3849 ** clean it 3850 ** wait on it. 3851 ** 3852 */ 3853 int reiserfs_prepare_for_journal(struct super_block *sb, 3854 struct buffer_head *bh, int wait) 3855 { 3856 PROC_INFO_INC(sb, journal.prepare); 3857 3858 if (!trylock_buffer(bh)) { 3859 if (!wait) 3860 return 0; 3861 lock_buffer(bh); 3862 } 3863 set_buffer_journal_prepared(bh); 3864 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) { 3865 clear_buffer_journal_test(bh); 3866 set_buffer_journal_restore_dirty(bh); 3867 } 3868 unlock_buffer(bh); 3869 return 1; 3870 } 3871 3872 static void flush_old_journal_lists(struct super_block *s) 3873 { 3874 struct reiserfs_journal *journal = SB_JOURNAL(s); 3875 struct reiserfs_journal_list *jl; 3876 struct list_head *entry; 3877 time_t now = get_seconds(); 3878 3879 while (!list_empty(&journal->j_journal_list)) { 3880 entry = journal->j_journal_list.next; 3881 jl = JOURNAL_LIST_ENTRY(entry); 3882 /* this check should always be run, to send old lists to disk */ 3883 if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) && 3884 atomic_read(&jl->j_commit_left) == 0 && 3885 test_transaction(s, jl)) { 3886 flush_used_journal_lists(s, jl); 3887 } else { 3888 break; 3889 } 3890 } 3891 } 3892 3893 /* 3894 ** long and ugly. If flush, will not return until all commit 3895 ** blocks and all real buffers in the trans are on disk. 3896 ** If no_async, won't return until all commit blocks are on disk. 3897 ** 3898 ** keep reading, there are comments as you go along 3899 ** 3900 ** If the journal is aborted, we just clean up. Things like flushing 3901 ** journal lists, etc just won't happen. 3902 */ 3903 static int do_journal_end(struct reiserfs_transaction_handle *th, 3904 struct super_block *sb, unsigned long nblocks, 3905 int flags) 3906 { 3907 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3908 struct reiserfs_journal_cnode *cn, *next, *jl_cn; 3909 struct reiserfs_journal_cnode *last_cn = NULL; 3910 struct reiserfs_journal_desc *desc; 3911 struct reiserfs_journal_commit *commit; 3912 struct buffer_head *c_bh; /* commit bh */ 3913 struct buffer_head *d_bh; /* desc bh */ 3914 int cur_write_start = 0; /* start index of current log write */ 3915 int old_start; 3916 int i; 3917 int flush; 3918 int wait_on_commit; 3919 struct reiserfs_journal_list *jl, *temp_jl; 3920 struct list_head *entry, *safe; 3921 unsigned long jindex; 3922 unsigned int commit_trans_id; 3923 int trans_half; 3924 3925 BUG_ON(th->t_refcount > 1); 3926 BUG_ON(!th->t_trans_id); 3927 3928 /* protect flush_older_commits from doing mistakes if the 3929 transaction ID counter gets overflowed. */ 3930 if (th->t_trans_id == ~0U) 3931 flags |= FLUSH_ALL | COMMIT_NOW | WAIT; 3932 flush = flags & FLUSH_ALL; 3933 wait_on_commit = flags & WAIT; 3934 3935 current->journal_info = th->t_handle_save; 3936 reiserfs_check_lock_depth(sb, "journal end"); 3937 if (journal->j_len == 0) { 3938 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 3939 1); 3940 journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb)); 3941 } 3942 3943 lock_journal(sb); 3944 if (journal->j_next_full_flush) { 3945 flags |= FLUSH_ALL; 3946 flush = 1; 3947 } 3948 if (journal->j_next_async_flush) { 3949 flags |= COMMIT_NOW | WAIT; 3950 wait_on_commit = 1; 3951 } 3952 3953 /* check_journal_end locks the journal, and unlocks if it does not return 1 3954 ** it tells us if we should continue with the journal_end, or just return 3955 */ 3956 if (!check_journal_end(th, sb, nblocks, flags)) { 3957 reiserfs_schedule_old_flush(sb); 3958 wake_queued_writers(sb); 3959 reiserfs_async_progress_wait(sb); 3960 goto out; 3961 } 3962 3963 /* check_journal_end might set these, check again */ 3964 if (journal->j_next_full_flush) { 3965 flush = 1; 3966 } 3967 3968 /* 3969 ** j must wait means we have to flush the log blocks, and the real blocks for 3970 ** this transaction 3971 */ 3972 if (journal->j_must_wait > 0) { 3973 flush = 1; 3974 } 3975 #ifdef REISERFS_PREALLOCATE 3976 /* quota ops might need to nest, setup the journal_info pointer for them 3977 * and raise the refcount so that it is > 0. */ 3978 current->journal_info = th; 3979 th->t_refcount++; 3980 reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into 3981 * the transaction */ 3982 th->t_refcount--; 3983 current->journal_info = th->t_handle_save; 3984 #endif 3985 3986 /* setup description block */ 3987 d_bh = 3988 journal_getblk(sb, 3989 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 3990 journal->j_start); 3991 set_buffer_uptodate(d_bh); 3992 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data; 3993 memset(d_bh->b_data, 0, d_bh->b_size); 3994 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8); 3995 set_desc_trans_id(desc, journal->j_trans_id); 3996 3997 /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */ 3998 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 3999 ((journal->j_start + journal->j_len + 4000 1) % SB_ONDISK_JOURNAL_SIZE(sb))); 4001 commit = (struct reiserfs_journal_commit *)c_bh->b_data; 4002 memset(c_bh->b_data, 0, c_bh->b_size); 4003 set_commit_trans_id(commit, journal->j_trans_id); 4004 set_buffer_uptodate(c_bh); 4005 4006 /* init this journal list */ 4007 jl = journal->j_current_jl; 4008 4009 /* we lock the commit before doing anything because 4010 * we want to make sure nobody tries to run flush_commit_list until 4011 * the new transaction is fully setup, and we've already flushed the 4012 * ordered bh list 4013 */ 4014 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb); 4015 4016 /* save the transaction id in case we need to commit it later */ 4017 commit_trans_id = jl->j_trans_id; 4018 4019 atomic_set(&jl->j_older_commits_done, 0); 4020 jl->j_trans_id = journal->j_trans_id; 4021 jl->j_timestamp = journal->j_trans_start_time; 4022 jl->j_commit_bh = c_bh; 4023 jl->j_start = journal->j_start; 4024 jl->j_len = journal->j_len; 4025 atomic_set(&jl->j_nonzerolen, journal->j_len); 4026 atomic_set(&jl->j_commit_left, journal->j_len + 2); 4027 jl->j_realblock = NULL; 4028 4029 /* The ENTIRE FOR LOOP MUST not cause schedule to occur. 4030 ** for each real block, add it to the journal list hash, 4031 ** copy into real block index array in the commit or desc block 4032 */ 4033 trans_half = journal_trans_half(sb->s_blocksize); 4034 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) { 4035 if (buffer_journaled(cn->bh)) { 4036 jl_cn = get_cnode(sb); 4037 if (!jl_cn) { 4038 reiserfs_panic(sb, "journal-1676", 4039 "get_cnode returned NULL"); 4040 } 4041 if (i == 0) { 4042 jl->j_realblock = jl_cn; 4043 } 4044 jl_cn->prev = last_cn; 4045 jl_cn->next = NULL; 4046 if (last_cn) { 4047 last_cn->next = jl_cn; 4048 } 4049 last_cn = jl_cn; 4050 /* make sure the block we are trying to log is not a block 4051 of journal or reserved area */ 4052 4053 if (is_block_in_log_or_reserved_area 4054 (sb, cn->bh->b_blocknr)) { 4055 reiserfs_panic(sb, "journal-2332", 4056 "Trying to log block %lu, " 4057 "which is a log block", 4058 cn->bh->b_blocknr); 4059 } 4060 jl_cn->blocknr = cn->bh->b_blocknr; 4061 jl_cn->state = 0; 4062 jl_cn->sb = sb; 4063 jl_cn->bh = cn->bh; 4064 jl_cn->jlist = jl; 4065 insert_journal_hash(journal->j_list_hash_table, jl_cn); 4066 if (i < trans_half) { 4067 desc->j_realblock[i] = 4068 cpu_to_le32(cn->bh->b_blocknr); 4069 } else { 4070 commit->j_realblock[i - trans_half] = 4071 cpu_to_le32(cn->bh->b_blocknr); 4072 } 4073 } else { 4074 i--; 4075 } 4076 } 4077 set_desc_trans_len(desc, journal->j_len); 4078 set_desc_mount_id(desc, journal->j_mount_id); 4079 set_desc_trans_id(desc, journal->j_trans_id); 4080 set_commit_trans_len(commit, journal->j_len); 4081 4082 /* special check in case all buffers in the journal were marked for not logging */ 4083 BUG_ON(journal->j_len == 0); 4084 4085 /* we're about to dirty all the log blocks, mark the description block 4086 * dirty now too. Don't mark the commit block dirty until all the 4087 * others are on disk 4088 */ 4089 mark_buffer_dirty(d_bh); 4090 4091 /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */ 4092 cur_write_start = journal->j_start; 4093 cn = journal->j_first; 4094 jindex = 1; /* start at one so we don't get the desc again */ 4095 while (cn) { 4096 clear_buffer_journal_new(cn->bh); 4097 /* copy all the real blocks into log area. dirty log blocks */ 4098 if (buffer_journaled(cn->bh)) { 4099 struct buffer_head *tmp_bh; 4100 char *addr; 4101 struct page *page; 4102 tmp_bh = 4103 journal_getblk(sb, 4104 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 4105 ((cur_write_start + 4106 jindex) % 4107 SB_ONDISK_JOURNAL_SIZE(sb))); 4108 set_buffer_uptodate(tmp_bh); 4109 page = cn->bh->b_page; 4110 addr = kmap(page); 4111 memcpy(tmp_bh->b_data, 4112 addr + offset_in_page(cn->bh->b_data), 4113 cn->bh->b_size); 4114 kunmap(page); 4115 mark_buffer_dirty(tmp_bh); 4116 jindex++; 4117 set_buffer_journal_dirty(cn->bh); 4118 clear_buffer_journaled(cn->bh); 4119 } else { 4120 /* JDirty cleared sometime during transaction. don't log this one */ 4121 reiserfs_warning(sb, "journal-2048", 4122 "BAD, buffer in journal hash, " 4123 "but not JDirty!"); 4124 brelse(cn->bh); 4125 } 4126 next = cn->next; 4127 free_cnode(sb, cn); 4128 cn = next; 4129 reiserfs_write_unlock(sb); 4130 cond_resched(); 4131 reiserfs_write_lock(sb); 4132 } 4133 4134 /* we are done with both the c_bh and d_bh, but 4135 ** c_bh must be written after all other commit blocks, 4136 ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. 4137 */ 4138 4139 journal->j_current_jl = alloc_journal_list(sb); 4140 4141 /* now it is safe to insert this transaction on the main list */ 4142 list_add_tail(&jl->j_list, &journal->j_journal_list); 4143 list_add_tail(&jl->j_working_list, &journal->j_working_list); 4144 journal->j_num_work_lists++; 4145 4146 /* reset journal values for the next transaction */ 4147 old_start = journal->j_start; 4148 journal->j_start = 4149 (journal->j_start + journal->j_len + 4150 2) % SB_ONDISK_JOURNAL_SIZE(sb); 4151 atomic_set(&(journal->j_wcount), 0); 4152 journal->j_bcount = 0; 4153 journal->j_last = NULL; 4154 journal->j_first = NULL; 4155 journal->j_len = 0; 4156 journal->j_trans_start_time = 0; 4157 /* check for trans_id overflow */ 4158 if (++journal->j_trans_id == 0) 4159 journal->j_trans_id = 10; 4160 journal->j_current_jl->j_trans_id = journal->j_trans_id; 4161 journal->j_must_wait = 0; 4162 journal->j_len_alloc = 0; 4163 journal->j_next_full_flush = 0; 4164 journal->j_next_async_flush = 0; 4165 init_journal_hash(sb); 4166 4167 // make sure reiserfs_add_jh sees the new current_jl before we 4168 // write out the tails 4169 smp_mb(); 4170 4171 /* tail conversion targets have to hit the disk before we end the 4172 * transaction. Otherwise a later transaction might repack the tail 4173 * before this transaction commits, leaving the data block unflushed and 4174 * clean, if we crash before the later transaction commits, the data block 4175 * is lost. 4176 */ 4177 if (!list_empty(&jl->j_tail_bh_list)) { 4178 reiserfs_write_unlock(sb); 4179 write_ordered_buffers(&journal->j_dirty_buffers_lock, 4180 journal, jl, &jl->j_tail_bh_list); 4181 reiserfs_write_lock(sb); 4182 } 4183 BUG_ON(!list_empty(&jl->j_tail_bh_list)); 4184 mutex_unlock(&jl->j_commit_mutex); 4185 4186 /* honor the flush wishes from the caller, simple commits can 4187 ** be done outside the journal lock, they are done below 4188 ** 4189 ** if we don't flush the commit list right now, we put it into 4190 ** the work queue so the people waiting on the async progress work 4191 ** queue don't wait for this proc to flush journal lists and such. 4192 */ 4193 if (flush) { 4194 flush_commit_list(sb, jl, 1); 4195 flush_journal_list(sb, jl, 1); 4196 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) 4197 queue_delayed_work(commit_wq, &journal->j_work, HZ / 10); 4198 4199 /* if the next transaction has any chance of wrapping, flush 4200 ** transactions that might get overwritten. If any journal lists are very 4201 ** old flush them as well. 4202 */ 4203 first_jl: 4204 list_for_each_safe(entry, safe, &journal->j_journal_list) { 4205 temp_jl = JOURNAL_LIST_ENTRY(entry); 4206 if (journal->j_start <= temp_jl->j_start) { 4207 if ((journal->j_start + journal->j_trans_max + 1) >= 4208 temp_jl->j_start) { 4209 flush_used_journal_lists(sb, temp_jl); 4210 goto first_jl; 4211 } else if ((journal->j_start + 4212 journal->j_trans_max + 1) < 4213 SB_ONDISK_JOURNAL_SIZE(sb)) { 4214 /* if we don't cross into the next transaction and we don't 4215 * wrap, there is no way we can overlap any later transactions 4216 * break now 4217 */ 4218 break; 4219 } 4220 } else if ((journal->j_start + 4221 journal->j_trans_max + 1) > 4222 SB_ONDISK_JOURNAL_SIZE(sb)) { 4223 if (((journal->j_start + journal->j_trans_max + 1) % 4224 SB_ONDISK_JOURNAL_SIZE(sb)) >= 4225 temp_jl->j_start) { 4226 flush_used_journal_lists(sb, temp_jl); 4227 goto first_jl; 4228 } else { 4229 /* we don't overlap anything from out start to the end of the 4230 * log, and our wrapped portion doesn't overlap anything at 4231 * the start of the log. We can break 4232 */ 4233 break; 4234 } 4235 } 4236 } 4237 flush_old_journal_lists(sb); 4238 4239 journal->j_current_jl->j_list_bitmap = 4240 get_list_bitmap(sb, journal->j_current_jl); 4241 4242 if (!(journal->j_current_jl->j_list_bitmap)) { 4243 reiserfs_panic(sb, "journal-1996", 4244 "could not get a list bitmap"); 4245 } 4246 4247 atomic_set(&(journal->j_jlock), 0); 4248 unlock_journal(sb); 4249 /* wake up any body waiting to join. */ 4250 clear_bit(J_WRITERS_QUEUED, &journal->j_state); 4251 wake_up(&(journal->j_join_wait)); 4252 4253 if (!flush && wait_on_commit && 4254 journal_list_still_alive(sb, commit_trans_id)) { 4255 flush_commit_list(sb, jl, 1); 4256 } 4257 out: 4258 reiserfs_check_lock_depth(sb, "journal end2"); 4259 4260 memset(th, 0, sizeof(*th)); 4261 /* Re-set th->t_super, so we can properly keep track of how many 4262 * persistent transactions there are. We need to do this so if this 4263 * call is part of a failed restart_transaction, we can free it later */ 4264 th->t_super = sb; 4265 4266 return journal->j_errno; 4267 } 4268 4269 /* Send the file system read only and refuse new transactions */ 4270 void reiserfs_abort_journal(struct super_block *sb, int errno) 4271 { 4272 struct reiserfs_journal *journal = SB_JOURNAL(sb); 4273 if (test_bit(J_ABORTED, &journal->j_state)) 4274 return; 4275 4276 if (!journal->j_errno) 4277 journal->j_errno = errno; 4278 4279 sb->s_flags |= MS_RDONLY; 4280 set_bit(J_ABORTED, &journal->j_state); 4281 4282 #ifdef CONFIG_REISERFS_CHECK 4283 dump_stack(); 4284 #endif 4285 } 4286