1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Write ahead logging implementation copyright Chris Mason 2000 4 * 5 * The background commits make this code very interrelated, and 6 * overly complex. I need to rethink things a bit....The major players: 7 * 8 * journal_begin -- call with the number of blocks you expect to log. 9 * If the current transaction is too 10 * old, it will block until the current transaction is 11 * finished, and then start a new one. 12 * Usually, your transaction will get joined in with 13 * previous ones for speed. 14 * 15 * journal_join -- same as journal_begin, but won't block on the current 16 * transaction regardless of age. Don't ever call 17 * this. Ever. There are only two places it should be 18 * called from, and they are both inside this file. 19 * 20 * journal_mark_dirty -- adds blocks into this transaction. clears any flags 21 * that might make them get sent to disk 22 * and then marks them BH_JDirty. Puts the buffer head 23 * into the current transaction hash. 24 * 25 * journal_end -- if the current transaction is batchable, it does nothing 26 * otherwise, it could do an async/synchronous commit, or 27 * a full flush of all log and real blocks in the 28 * transaction. 29 * 30 * flush_old_commits -- if the current transaction is too old, it is ended and 31 * commit blocks are sent to disk. Forces commit blocks 32 * to disk for all backgrounded commits that have been 33 * around too long. 34 * -- Note, if you call this as an immediate flush from 35 * within kupdate, it will ignore the immediate flag 36 */ 37 38 #include <linux/time.h> 39 #include <linux/semaphore.h> 40 #include <linux/vmalloc.h> 41 #include "reiserfs.h" 42 #include <linux/kernel.h> 43 #include <linux/errno.h> 44 #include <linux/fcntl.h> 45 #include <linux/stat.h> 46 #include <linux/string.h> 47 #include <linux/buffer_head.h> 48 #include <linux/workqueue.h> 49 #include <linux/writeback.h> 50 #include <linux/blkdev.h> 51 #include <linux/backing-dev.h> 52 #include <linux/uaccess.h> 53 #include <linux/slab.h> 54 55 56 /* gets a struct reiserfs_journal_list * from a list head */ 57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ 58 j_list)) 59 60 /* must be correct to keep the desc and commit structs at 4k */ 61 #define JOURNAL_TRANS_HALF 1018 62 #define BUFNR 64 /*read ahead */ 63 64 /* cnode stat bits. Move these into reiserfs_fs.h */ 65 66 /* this block was freed, and can't be written. */ 67 #define BLOCK_FREED 2 68 /* this block was freed during this transaction, and can't be written */ 69 #define BLOCK_FREED_HOLDER 3 70 71 /* used in flush_journal_list */ 72 #define BLOCK_NEEDS_FLUSH 4 73 #define BLOCK_DIRTIED 5 74 75 /* journal list state bits */ 76 #define LIST_TOUCHED 1 77 #define LIST_DIRTY 2 78 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */ 79 80 /* flags for do_journal_end */ 81 #define FLUSH_ALL 1 /* flush commit and real blocks */ 82 #define COMMIT_NOW 2 /* end and commit this transaction */ 83 #define WAIT 4 /* wait for the log blocks to hit the disk */ 84 85 static int do_journal_end(struct reiserfs_transaction_handle *, int flags); 86 static int flush_journal_list(struct super_block *s, 87 struct reiserfs_journal_list *jl, int flushall); 88 static int flush_commit_list(struct super_block *s, 89 struct reiserfs_journal_list *jl, int flushall); 90 static int can_dirty(struct reiserfs_journal_cnode *cn); 91 static int journal_join(struct reiserfs_transaction_handle *th, 92 struct super_block *sb); 93 static void release_journal_dev(struct super_block *super, 94 struct reiserfs_journal *journal); 95 static void dirty_one_transaction(struct super_block *s, 96 struct reiserfs_journal_list *jl); 97 static void flush_async_commits(struct work_struct *work); 98 static void queue_log_writer(struct super_block *s); 99 100 /* values for join in do_journal_begin_r */ 101 enum { 102 JBEGIN_REG = 0, /* regular journal begin */ 103 /* join the running transaction if at all possible */ 104 JBEGIN_JOIN = 1, 105 /* called from cleanup code, ignores aborted flag */ 106 JBEGIN_ABORT = 2, 107 }; 108 109 static int do_journal_begin_r(struct reiserfs_transaction_handle *th, 110 struct super_block *sb, 111 unsigned long nblocks, int join); 112 113 static void init_journal_hash(struct super_block *sb) 114 { 115 struct reiserfs_journal *journal = SB_JOURNAL(sb); 116 memset(journal->j_hash_table, 0, 117 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); 118 } 119 120 /* 121 * clears BH_Dirty and sticks the buffer on the clean list. Called because 122 * I can't allow refile_buffer to make schedule happen after I've freed a 123 * block. Look at remove_from_transaction and journal_mark_freed for 124 * more details. 125 */ 126 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) 127 { 128 if (bh) { 129 clear_buffer_dirty(bh); 130 clear_buffer_journal_test(bh); 131 } 132 return 0; 133 } 134 135 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block 136 *sb) 137 { 138 struct reiserfs_bitmap_node *bn; 139 static int id; 140 141 bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS); 142 if (!bn) { 143 return NULL; 144 } 145 bn->data = kzalloc(sb->s_blocksize, GFP_NOFS); 146 if (!bn->data) { 147 kfree(bn); 148 return NULL; 149 } 150 bn->id = id++; 151 INIT_LIST_HEAD(&bn->list); 152 return bn; 153 } 154 155 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb) 156 { 157 struct reiserfs_journal *journal = SB_JOURNAL(sb); 158 struct reiserfs_bitmap_node *bn = NULL; 159 struct list_head *entry = journal->j_bitmap_nodes.next; 160 161 journal->j_used_bitmap_nodes++; 162 repeat: 163 164 if (entry != &journal->j_bitmap_nodes) { 165 bn = list_entry(entry, struct reiserfs_bitmap_node, list); 166 list_del(entry); 167 memset(bn->data, 0, sb->s_blocksize); 168 journal->j_free_bitmap_nodes--; 169 return bn; 170 } 171 bn = allocate_bitmap_node(sb); 172 if (!bn) { 173 yield(); 174 goto repeat; 175 } 176 return bn; 177 } 178 static inline void free_bitmap_node(struct super_block *sb, 179 struct reiserfs_bitmap_node *bn) 180 { 181 struct reiserfs_journal *journal = SB_JOURNAL(sb); 182 journal->j_used_bitmap_nodes--; 183 if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) { 184 kfree(bn->data); 185 kfree(bn); 186 } else { 187 list_add(&bn->list, &journal->j_bitmap_nodes); 188 journal->j_free_bitmap_nodes++; 189 } 190 } 191 192 static void allocate_bitmap_nodes(struct super_block *sb) 193 { 194 int i; 195 struct reiserfs_journal *journal = SB_JOURNAL(sb); 196 struct reiserfs_bitmap_node *bn = NULL; 197 for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) { 198 bn = allocate_bitmap_node(sb); 199 if (bn) { 200 list_add(&bn->list, &journal->j_bitmap_nodes); 201 journal->j_free_bitmap_nodes++; 202 } else { 203 /* this is ok, we'll try again when more are needed */ 204 break; 205 } 206 } 207 } 208 209 static int set_bit_in_list_bitmap(struct super_block *sb, 210 b_blocknr_t block, 211 struct reiserfs_list_bitmap *jb) 212 { 213 unsigned int bmap_nr = block / (sb->s_blocksize << 3); 214 unsigned int bit_nr = block % (sb->s_blocksize << 3); 215 216 if (!jb->bitmaps[bmap_nr]) { 217 jb->bitmaps[bmap_nr] = get_bitmap_node(sb); 218 } 219 set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data); 220 return 0; 221 } 222 223 static void cleanup_bitmap_list(struct super_block *sb, 224 struct reiserfs_list_bitmap *jb) 225 { 226 int i; 227 if (jb->bitmaps == NULL) 228 return; 229 230 for (i = 0; i < reiserfs_bmap_count(sb); i++) { 231 if (jb->bitmaps[i]) { 232 free_bitmap_node(sb, jb->bitmaps[i]); 233 jb->bitmaps[i] = NULL; 234 } 235 } 236 } 237 238 /* 239 * only call this on FS unmount. 240 */ 241 static int free_list_bitmaps(struct super_block *sb, 242 struct reiserfs_list_bitmap *jb_array) 243 { 244 int i; 245 struct reiserfs_list_bitmap *jb; 246 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { 247 jb = jb_array + i; 248 jb->journal_list = NULL; 249 cleanup_bitmap_list(sb, jb); 250 vfree(jb->bitmaps); 251 jb->bitmaps = NULL; 252 } 253 return 0; 254 } 255 256 static int free_bitmap_nodes(struct super_block *sb) 257 { 258 struct reiserfs_journal *journal = SB_JOURNAL(sb); 259 struct list_head *next = journal->j_bitmap_nodes.next; 260 struct reiserfs_bitmap_node *bn; 261 262 while (next != &journal->j_bitmap_nodes) { 263 bn = list_entry(next, struct reiserfs_bitmap_node, list); 264 list_del(next); 265 kfree(bn->data); 266 kfree(bn); 267 next = journal->j_bitmap_nodes.next; 268 journal->j_free_bitmap_nodes--; 269 } 270 271 return 0; 272 } 273 274 /* 275 * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. 276 * jb_array is the array to be filled in. 277 */ 278 int reiserfs_allocate_list_bitmaps(struct super_block *sb, 279 struct reiserfs_list_bitmap *jb_array, 280 unsigned int bmap_nr) 281 { 282 int i; 283 int failed = 0; 284 struct reiserfs_list_bitmap *jb; 285 int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *); 286 287 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { 288 jb = jb_array + i; 289 jb->journal_list = NULL; 290 jb->bitmaps = vzalloc(mem); 291 if (!jb->bitmaps) { 292 reiserfs_warning(sb, "clm-2000", "unable to " 293 "allocate bitmaps for journal lists"); 294 failed = 1; 295 break; 296 } 297 } 298 if (failed) { 299 free_list_bitmaps(sb, jb_array); 300 return -1; 301 } 302 return 0; 303 } 304 305 /* 306 * find an available list bitmap. If you can't find one, flush a commit list 307 * and try again 308 */ 309 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb, 310 struct reiserfs_journal_list 311 *jl) 312 { 313 int i, j; 314 struct reiserfs_journal *journal = SB_JOURNAL(sb); 315 struct reiserfs_list_bitmap *jb = NULL; 316 317 for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) { 318 i = journal->j_list_bitmap_index; 319 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS; 320 jb = journal->j_list_bitmap + i; 321 if (journal->j_list_bitmap[i].journal_list) { 322 flush_commit_list(sb, 323 journal->j_list_bitmap[i]. 324 journal_list, 1); 325 if (!journal->j_list_bitmap[i].journal_list) { 326 break; 327 } 328 } else { 329 break; 330 } 331 } 332 /* double check to make sure if flushed correctly */ 333 if (jb->journal_list) 334 return NULL; 335 jb->journal_list = jl; 336 return jb; 337 } 338 339 /* 340 * allocates a new chunk of X nodes, and links them all together as a list. 341 * Uses the cnode->next and cnode->prev pointers 342 * returns NULL on failure 343 */ 344 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) 345 { 346 struct reiserfs_journal_cnode *head; 347 int i; 348 if (num_cnodes <= 0) { 349 return NULL; 350 } 351 head = vzalloc(array_size(num_cnodes, 352 sizeof(struct reiserfs_journal_cnode))); 353 if (!head) { 354 return NULL; 355 } 356 head[0].prev = NULL; 357 head[0].next = head + 1; 358 for (i = 1; i < num_cnodes; i++) { 359 head[i].prev = head + (i - 1); 360 head[i].next = head + (i + 1); /* if last one, overwrite it after the if */ 361 } 362 head[num_cnodes - 1].next = NULL; 363 return head; 364 } 365 366 /* pulls a cnode off the free list, or returns NULL on failure */ 367 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb) 368 { 369 struct reiserfs_journal_cnode *cn; 370 struct reiserfs_journal *journal = SB_JOURNAL(sb); 371 372 reiserfs_check_lock_depth(sb, "get_cnode"); 373 374 if (journal->j_cnode_free <= 0) { 375 return NULL; 376 } 377 journal->j_cnode_used++; 378 journal->j_cnode_free--; 379 cn = journal->j_cnode_free_list; 380 if (!cn) { 381 return cn; 382 } 383 if (cn->next) { 384 cn->next->prev = NULL; 385 } 386 journal->j_cnode_free_list = cn->next; 387 memset(cn, 0, sizeof(struct reiserfs_journal_cnode)); 388 return cn; 389 } 390 391 /* 392 * returns a cnode to the free list 393 */ 394 static void free_cnode(struct super_block *sb, 395 struct reiserfs_journal_cnode *cn) 396 { 397 struct reiserfs_journal *journal = SB_JOURNAL(sb); 398 399 reiserfs_check_lock_depth(sb, "free_cnode"); 400 401 journal->j_cnode_used--; 402 journal->j_cnode_free++; 403 /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */ 404 cn->next = journal->j_cnode_free_list; 405 if (journal->j_cnode_free_list) { 406 journal->j_cnode_free_list->prev = cn; 407 } 408 cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */ 409 journal->j_cnode_free_list = cn; 410 } 411 412 static void clear_prepared_bits(struct buffer_head *bh) 413 { 414 clear_buffer_journal_prepared(bh); 415 clear_buffer_journal_restore_dirty(bh); 416 } 417 418 /* 419 * return a cnode with same dev, block number and size in table, 420 * or null if not found 421 */ 422 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct 423 super_block 424 *sb, 425 struct 426 reiserfs_journal_cnode 427 **table, 428 long bl) 429 { 430 struct reiserfs_journal_cnode *cn; 431 cn = journal_hash(table, sb, bl); 432 while (cn) { 433 if (cn->blocknr == bl && cn->sb == sb) 434 return cn; 435 cn = cn->hnext; 436 } 437 return (struct reiserfs_journal_cnode *)0; 438 } 439 440 /* 441 * this actually means 'can this block be reallocated yet?'. If you set 442 * search_all, a block can only be allocated if it is not in the current 443 * transaction, was not freed by the current transaction, and has no chance 444 * of ever 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 447 * in the current transaction. Since deleting a block removes it from the 448 * current transaction, this case should never happen. If you don't set 449 * search_all, make sure you never write the block without logging it. 450 * 451 * next_zero_bit is a suggestion about the next block to try for find_forward. 452 * when bl is rejected because it is set in a journal list bitmap, we search 453 * for the next zero bit in the bitmap that rejected bl. Then, we return 454 * that through next_zero_bit for find_forward to try. 455 * 456 * Just because we return something in next_zero_bit does not mean we won't 457 * reject it on the next call to reiserfs_in_journal 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_list_bitmap *jb; 465 int i; 466 unsigned long bl; 467 468 *next_zero_bit = 0; /* always start this at zero. */ 469 470 PROC_INFO_INC(sb, journal.in_journal); 471 /* 472 * If we aren't doing a search_all, this is a metablock, and it 473 * will be logged before use. if we crash before the transaction 474 * that freed it commits, this transaction won't have committed 475 * either, and the block will never be written 476 */ 477 if (search_all) { 478 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { 479 PROC_INFO_INC(sb, journal.in_journal_bitmap); 480 jb = journal->j_list_bitmap + i; 481 if (jb->journal_list && jb->bitmaps[bmap_nr] && 482 test_bit(bit_nr, 483 (unsigned long *)jb->bitmaps[bmap_nr]-> 484 data)) { 485 *next_zero_bit = 486 find_next_zero_bit((unsigned long *) 487 (jb->bitmaps[bmap_nr]-> 488 data), 489 sb->s_blocksize << 3, 490 bit_nr + 1); 491 return 1; 492 } 493 } 494 } 495 496 bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr; 497 /* is it in any old transactions? */ 498 if (search_all 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 ((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 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table, 516 struct reiserfs_journal_cnode *cn) 517 { 518 struct reiserfs_journal_cnode *cn_orig; 519 520 cn_orig = journal_hash(table, cn->sb, cn->blocknr); 521 cn->hnext = cn_orig; 522 cn->hprev = NULL; 523 if (cn_orig) { 524 cn_orig->hprev = cn; 525 } 526 journal_hash(table, cn->sb, cn->blocknr) = cn; 527 } 528 529 /* lock the current transaction */ 530 static inline void lock_journal(struct super_block *sb) 531 { 532 PROC_INFO_INC(sb, journal.lock_journal); 533 534 reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb); 535 } 536 537 /* unlock the current transaction */ 538 static inline void unlock_journal(struct super_block *sb) 539 { 540 mutex_unlock(&SB_JOURNAL(sb)->j_mutex); 541 } 542 543 static inline void get_journal_list(struct reiserfs_journal_list *jl) 544 { 545 jl->j_refcount++; 546 } 547 548 static inline void put_journal_list(struct super_block *s, 549 struct reiserfs_journal_list *jl) 550 { 551 if (jl->j_refcount < 1) { 552 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d", 553 jl->j_trans_id, jl->j_refcount); 554 } 555 if (--jl->j_refcount == 0) 556 kfree(jl); 557 } 558 559 /* 560 * this used to be much more involved, and I'm keeping it just in case 561 * things get ugly again. it gets called by flush_commit_list, and 562 * cleans up any data stored about blocks freed during a transaction. 563 */ 564 static void cleanup_freed_for_journal_list(struct super_block *sb, 565 struct reiserfs_journal_list *jl) 566 { 567 568 struct reiserfs_list_bitmap *jb = jl->j_list_bitmap; 569 if (jb) { 570 cleanup_bitmap_list(sb, jb); 571 } 572 jl->j_list_bitmap->journal_list = NULL; 573 jl->j_list_bitmap = NULL; 574 } 575 576 static int journal_list_still_alive(struct super_block *s, 577 unsigned int trans_id) 578 { 579 struct reiserfs_journal *journal = SB_JOURNAL(s); 580 struct list_head *entry = &journal->j_journal_list; 581 struct reiserfs_journal_list *jl; 582 583 if (!list_empty(entry)) { 584 jl = JOURNAL_LIST_ENTRY(entry->next); 585 if (jl->j_trans_id <= trans_id) { 586 return 1; 587 } 588 } 589 return 0; 590 } 591 592 /* 593 * If page->mapping was null, we failed to truncate this page for 594 * some reason. Most likely because it was truncated after being 595 * logged via data=journal. 596 * 597 * This does a check to see if the buffer belongs to one of these 598 * lost pages before doing the final put_bh. If page->mapping was 599 * null, it tries to free buffers on the page, which should make the 600 * final put_page drop the page from the lru. 601 */ 602 static void release_buffer_page(struct buffer_head *bh) 603 { 604 struct folio *folio = bh->b_folio; 605 if (!folio->mapping && folio_trylock(folio)) { 606 folio_get(folio); 607 put_bh(bh); 608 if (!folio->mapping) 609 try_to_free_buffers(folio); 610 folio_unlock(folio); 611 folio_put(folio); 612 } else { 613 put_bh(bh); 614 } 615 } 616 617 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) 618 { 619 if (buffer_journaled(bh)) { 620 reiserfs_warning(NULL, "clm-2084", 621 "pinned buffer %lu:%pg sent to disk", 622 bh->b_blocknr, bh->b_bdev); 623 } 624 if (uptodate) 625 set_buffer_uptodate(bh); 626 else 627 clear_buffer_uptodate(bh); 628 629 unlock_buffer(bh); 630 release_buffer_page(bh); 631 } 632 633 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate) 634 { 635 if (uptodate) 636 set_buffer_uptodate(bh); 637 else 638 clear_buffer_uptodate(bh); 639 unlock_buffer(bh); 640 put_bh(bh); 641 } 642 643 static void submit_logged_buffer(struct buffer_head *bh) 644 { 645 get_bh(bh); 646 bh->b_end_io = reiserfs_end_buffer_io_sync; 647 clear_buffer_journal_new(bh); 648 clear_buffer_dirty(bh); 649 if (!test_clear_buffer_journal_test(bh)) 650 BUG(); 651 if (!buffer_uptodate(bh)) 652 BUG(); 653 submit_bh(REQ_OP_WRITE, bh); 654 } 655 656 static void submit_ordered_buffer(struct buffer_head *bh) 657 { 658 get_bh(bh); 659 bh->b_end_io = reiserfs_end_ordered_io; 660 clear_buffer_dirty(bh); 661 if (!buffer_uptodate(bh)) 662 BUG(); 663 submit_bh(REQ_OP_WRITE, bh); 664 } 665 666 #define CHUNK_SIZE 32 667 struct buffer_chunk { 668 struct buffer_head *bh[CHUNK_SIZE]; 669 int nr; 670 }; 671 672 static void write_chunk(struct buffer_chunk *chunk) 673 { 674 int i; 675 for (i = 0; i < chunk->nr; i++) { 676 submit_logged_buffer(chunk->bh[i]); 677 } 678 chunk->nr = 0; 679 } 680 681 static void write_ordered_chunk(struct buffer_chunk *chunk) 682 { 683 int i; 684 for (i = 0; i < chunk->nr; i++) { 685 submit_ordered_buffer(chunk->bh[i]); 686 } 687 chunk->nr = 0; 688 } 689 690 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh, 691 spinlock_t * lock, void (fn) (struct buffer_chunk *)) 692 { 693 int ret = 0; 694 BUG_ON(chunk->nr >= CHUNK_SIZE); 695 chunk->bh[chunk->nr++] = bh; 696 if (chunk->nr >= CHUNK_SIZE) { 697 ret = 1; 698 if (lock) { 699 spin_unlock(lock); 700 fn(chunk); 701 spin_lock(lock); 702 } else { 703 fn(chunk); 704 } 705 } 706 return ret; 707 } 708 709 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0); 710 static struct reiserfs_jh *alloc_jh(void) 711 { 712 struct reiserfs_jh *jh; 713 while (1) { 714 jh = kmalloc(sizeof(*jh), GFP_NOFS); 715 if (jh) { 716 atomic_inc(&nr_reiserfs_jh); 717 return jh; 718 } 719 yield(); 720 } 721 } 722 723 /* 724 * we want to free the jh when the buffer has been written 725 * and waited on 726 */ 727 void reiserfs_free_jh(struct buffer_head *bh) 728 { 729 struct reiserfs_jh *jh; 730 731 jh = bh->b_private; 732 if (jh) { 733 bh->b_private = NULL; 734 jh->bh = NULL; 735 list_del_init(&jh->list); 736 kfree(jh); 737 if (atomic_read(&nr_reiserfs_jh) <= 0) 738 BUG(); 739 atomic_dec(&nr_reiserfs_jh); 740 put_bh(bh); 741 } 742 } 743 744 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh, 745 int tail) 746 { 747 struct reiserfs_jh *jh; 748 749 if (bh->b_private) { 750 spin_lock(&j->j_dirty_buffers_lock); 751 if (!bh->b_private) { 752 spin_unlock(&j->j_dirty_buffers_lock); 753 goto no_jh; 754 } 755 jh = bh->b_private; 756 list_del_init(&jh->list); 757 } else { 758 no_jh: 759 get_bh(bh); 760 jh = alloc_jh(); 761 spin_lock(&j->j_dirty_buffers_lock); 762 /* 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 /* 822 * in theory, dirty non-uptodate buffers should never get here, 823 * but the upper layer io error paths still have a few quirks. 824 * Handle them here as gracefully as we can 825 */ 826 if (!buffer_uptodate(bh) && buffer_dirty(bh)) { 827 clear_buffer_dirty(bh); 828 ret = -EIO; 829 } 830 if (buffer_dirty(bh)) { 831 list_move(&jh->list, &tmp); 832 add_to_chunk(&chunk, bh, lock, write_ordered_chunk); 833 } else { 834 reiserfs_free_jh(bh); 835 unlock_buffer(bh); 836 } 837 loop_next: 838 put_bh(bh); 839 cond_resched_lock(lock); 840 } 841 if (chunk.nr) { 842 spin_unlock(lock); 843 write_ordered_chunk(&chunk); 844 spin_lock(lock); 845 } 846 while (!list_empty(&tmp)) { 847 jh = JH_ENTRY(tmp.prev); 848 bh = jh->bh; 849 get_bh(bh); 850 reiserfs_free_jh(bh); 851 852 if (buffer_locked(bh)) { 853 spin_unlock(lock); 854 wait_on_buffer(bh); 855 spin_lock(lock); 856 } 857 if (!buffer_uptodate(bh)) { 858 ret = -EIO; 859 } 860 /* 861 * ugly interaction with invalidate_folio here. 862 * reiserfs_invalidate_folio will pin any buffer that has a 863 * valid journal head from an older transaction. If someone 864 * else sets our buffer dirty after we write it in the first 865 * loop, and then someone truncates the page away, nobody 866 * will ever write the buffer. We're safe if we write the 867 * page one last time after freeing the journal header. 868 */ 869 if (buffer_dirty(bh) && unlikely(bh->b_folio->mapping == NULL)) { 870 spin_unlock(lock); 871 write_dirty_buffer(bh, 0); 872 spin_lock(lock); 873 } 874 put_bh(bh); 875 cond_resched_lock(lock); 876 } 877 spin_unlock(lock); 878 return ret; 879 } 880 881 static int flush_older_commits(struct super_block *s, 882 struct reiserfs_journal_list *jl) 883 { 884 struct reiserfs_journal *journal = SB_JOURNAL(s); 885 struct reiserfs_journal_list *other_jl; 886 struct reiserfs_journal_list *first_jl; 887 struct list_head *entry; 888 unsigned int trans_id = jl->j_trans_id; 889 unsigned int other_trans_id; 890 891 find_first: 892 /* 893 * first we walk backwards to find the oldest uncommitted transation 894 */ 895 first_jl = jl; 896 entry = jl->j_list.prev; 897 while (1) { 898 other_jl = JOURNAL_LIST_ENTRY(entry); 899 if (entry == &journal->j_journal_list || 900 atomic_read(&other_jl->j_older_commits_done)) 901 break; 902 903 first_jl = other_jl; 904 entry = other_jl->j_list.prev; 905 } 906 907 /* if we didn't find any older uncommitted transactions, return now */ 908 if (first_jl == jl) { 909 return 0; 910 } 911 912 entry = &first_jl->j_list; 913 while (1) { 914 other_jl = JOURNAL_LIST_ENTRY(entry); 915 other_trans_id = other_jl->j_trans_id; 916 917 if (other_trans_id < trans_id) { 918 if (atomic_read(&other_jl->j_commit_left) != 0) { 919 flush_commit_list(s, other_jl, 0); 920 921 /* list we were called with is gone, return */ 922 if (!journal_list_still_alive(s, trans_id)) 923 return 1; 924 925 /* 926 * the one we just flushed is gone, this means 927 * all older lists are also gone, so first_jl 928 * is no longer valid either. Go back to the 929 * beginning. 930 */ 931 if (!journal_list_still_alive 932 (s, other_trans_id)) { 933 goto find_first; 934 } 935 } 936 entry = entry->next; 937 if (entry == &journal->j_journal_list) 938 return 0; 939 } else { 940 return 0; 941 } 942 } 943 return 0; 944 } 945 946 static int reiserfs_async_progress_wait(struct super_block *s) 947 { 948 struct reiserfs_journal *j = SB_JOURNAL(s); 949 950 if (atomic_read(&j->j_async_throttle)) { 951 int depth; 952 953 depth = reiserfs_write_unlock_nested(s); 954 wait_var_event_timeout(&j->j_async_throttle, 955 atomic_read(&j->j_async_throttle) == 0, 956 HZ / 10); 957 reiserfs_write_lock_nested(s, depth); 958 } 959 960 return 0; 961 } 962 963 /* 964 * if this journal list still has commit blocks unflushed, send them to disk. 965 * 966 * log areas must be flushed in order (transaction 2 can't commit before 967 * transaction 1) Before the commit block can by written, every other log 968 * block must be safely on disk 969 */ 970 static int flush_commit_list(struct super_block *s, 971 struct reiserfs_journal_list *jl, int flushall) 972 { 973 int i; 974 b_blocknr_t bn; 975 struct buffer_head *tbh = NULL; 976 unsigned int trans_id = jl->j_trans_id; 977 struct reiserfs_journal *journal = SB_JOURNAL(s); 978 int retval = 0; 979 int write_len; 980 int depth; 981 982 reiserfs_check_lock_depth(s, "flush_commit_list"); 983 984 if (atomic_read(&jl->j_older_commits_done)) { 985 return 0; 986 } 987 988 /* 989 * before we can put our commit blocks on disk, we have to make 990 * sure everyone older than us is on disk too 991 */ 992 BUG_ON(jl->j_len <= 0); 993 BUG_ON(trans_id == journal->j_trans_id); 994 995 get_journal_list(jl); 996 if (flushall) { 997 if (flush_older_commits(s, jl) == 1) { 998 /* 999 * list disappeared during flush_older_commits. 1000 * return 1001 */ 1002 goto put_jl; 1003 } 1004 } 1005 1006 /* make sure nobody is trying to flush this one at the same time */ 1007 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s); 1008 1009 if (!journal_list_still_alive(s, trans_id)) { 1010 mutex_unlock(&jl->j_commit_mutex); 1011 goto put_jl; 1012 } 1013 BUG_ON(jl->j_trans_id == 0); 1014 1015 /* this commit is done, exit */ 1016 if (atomic_read(&jl->j_commit_left) <= 0) { 1017 if (flushall) { 1018 atomic_set(&jl->j_older_commits_done, 1); 1019 } 1020 mutex_unlock(&jl->j_commit_mutex); 1021 goto put_jl; 1022 } 1023 1024 if (!list_empty(&jl->j_bh_list)) { 1025 int ret; 1026 1027 /* 1028 * We might sleep in numerous places inside 1029 * write_ordered_buffers. Relax the write lock. 1030 */ 1031 depth = reiserfs_write_unlock_nested(s); 1032 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock, 1033 journal, jl, &jl->j_bh_list); 1034 if (ret < 0 && retval == 0) 1035 retval = ret; 1036 reiserfs_write_lock_nested(s, depth); 1037 } 1038 BUG_ON(!list_empty(&jl->j_bh_list)); 1039 /* 1040 * for the description block and all the log blocks, submit any buffers 1041 * that haven't already reached the disk. Try to write at least 256 1042 * log blocks. later on, we will only wait on blocks that correspond 1043 * to this transaction, but while we're unplugging we might as well 1044 * get a chunk of data on there. 1045 */ 1046 atomic_inc(&journal->j_async_throttle); 1047 write_len = jl->j_len + 1; 1048 if (write_len < 256) 1049 write_len = 256; 1050 for (i = 0 ; i < write_len ; i++) { 1051 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) % 1052 SB_ONDISK_JOURNAL_SIZE(s); 1053 tbh = journal_find_get_block(s, bn); 1054 if (tbh) { 1055 if (buffer_dirty(tbh)) { 1056 depth = reiserfs_write_unlock_nested(s); 1057 write_dirty_buffer(tbh, 0); 1058 reiserfs_write_lock_nested(s, depth); 1059 } 1060 put_bh(tbh) ; 1061 } 1062 } 1063 if (atomic_dec_and_test(&journal->j_async_throttle)) 1064 wake_up_var(&journal->j_async_throttle); 1065 1066 for (i = 0; i < (jl->j_len + 1); i++) { 1067 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + 1068 (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s); 1069 tbh = journal_find_get_block(s, bn); 1070 1071 depth = reiserfs_write_unlock_nested(s); 1072 __wait_on_buffer(tbh); 1073 reiserfs_write_lock_nested(s, depth); 1074 /* 1075 * since we're using ll_rw_blk above, it might have skipped 1076 * over a locked buffer. Double check here 1077 */ 1078 /* redundant, sync_dirty_buffer() checks */ 1079 if (buffer_dirty(tbh)) { 1080 depth = reiserfs_write_unlock_nested(s); 1081 sync_dirty_buffer(tbh); 1082 reiserfs_write_lock_nested(s, depth); 1083 } 1084 if (unlikely(!buffer_uptodate(tbh))) { 1085 #ifdef CONFIG_REISERFS_CHECK 1086 reiserfs_warning(s, "journal-601", 1087 "buffer write failed"); 1088 #endif 1089 retval = -EIO; 1090 } 1091 /* once for journal_find_get_block */ 1092 put_bh(tbh); 1093 /* once due to original getblk in do_journal_end */ 1094 put_bh(tbh); 1095 atomic_dec(&jl->j_commit_left); 1096 } 1097 1098 BUG_ON(atomic_read(&jl->j_commit_left) != 1); 1099 1100 /* 1101 * If there was a write error in the journal - we can't commit 1102 * this transaction - it will be invalid and, if successful, 1103 * will just end up propagating the write error out to 1104 * the file system. 1105 */ 1106 if (likely(!retval && !reiserfs_is_journal_aborted (journal))) { 1107 if (buffer_dirty(jl->j_commit_bh)) 1108 BUG(); 1109 mark_buffer_dirty(jl->j_commit_bh) ; 1110 depth = reiserfs_write_unlock_nested(s); 1111 if (reiserfs_barrier_flush(s)) 1112 __sync_dirty_buffer(jl->j_commit_bh, 1113 REQ_SYNC | REQ_PREFLUSH | REQ_FUA); 1114 else 1115 sync_dirty_buffer(jl->j_commit_bh); 1116 reiserfs_write_lock_nested(s, depth); 1117 } 1118 1119 /* 1120 * If there was a write error in the journal - we can't commit this 1121 * transaction - it will be invalid and, if successful, will just end 1122 * up propagating the write error out to the filesystem. 1123 */ 1124 if (unlikely(!buffer_uptodate(jl->j_commit_bh))) { 1125 #ifdef CONFIG_REISERFS_CHECK 1126 reiserfs_warning(s, "journal-615", "buffer write failed"); 1127 #endif 1128 retval = -EIO; 1129 } 1130 bforget(jl->j_commit_bh); 1131 if (journal->j_last_commit_id != 0 && 1132 (jl->j_trans_id - journal->j_last_commit_id) != 1) { 1133 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu", 1134 journal->j_last_commit_id, jl->j_trans_id); 1135 } 1136 journal->j_last_commit_id = jl->j_trans_id; 1137 1138 /* 1139 * now, every commit block is on the disk. It is safe to allow 1140 * blocks freed during this transaction to be reallocated 1141 */ 1142 cleanup_freed_for_journal_list(s, jl); 1143 1144 retval = retval ? retval : journal->j_errno; 1145 1146 /* mark the metadata dirty */ 1147 if (!retval) 1148 dirty_one_transaction(s, jl); 1149 atomic_dec(&jl->j_commit_left); 1150 1151 if (flushall) { 1152 atomic_set(&jl->j_older_commits_done, 1); 1153 } 1154 mutex_unlock(&jl->j_commit_mutex); 1155 put_jl: 1156 put_journal_list(s, jl); 1157 1158 if (retval) 1159 reiserfs_abort(s, retval, "Journal write error in %s", 1160 __func__); 1161 return retval; 1162 } 1163 1164 /* 1165 * flush_journal_list frequently needs to find a newer transaction for a 1166 * given block. This does that, or returns NULL if it can't find anything 1167 */ 1168 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct 1169 reiserfs_journal_cnode 1170 *cn) 1171 { 1172 struct super_block *sb = cn->sb; 1173 b_blocknr_t blocknr = cn->blocknr; 1174 1175 cn = cn->hprev; 1176 while (cn) { 1177 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) { 1178 return cn->jlist; 1179 } 1180 cn = cn->hprev; 1181 } 1182 return NULL; 1183 } 1184 1185 static void remove_journal_hash(struct super_block *, 1186 struct reiserfs_journal_cnode **, 1187 struct reiserfs_journal_list *, unsigned long, 1188 int); 1189 1190 /* 1191 * once all the real blocks have been flushed, it is safe to remove them 1192 * from the journal list for this transaction. Aside from freeing the 1193 * cnode, this also allows the block to be reallocated for data blocks 1194 * if it had been deleted. 1195 */ 1196 static void remove_all_from_journal_list(struct super_block *sb, 1197 struct reiserfs_journal_list *jl, 1198 int debug) 1199 { 1200 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1201 struct reiserfs_journal_cnode *cn, *last; 1202 cn = jl->j_realblock; 1203 1204 /* 1205 * which is better, to lock once around the whole loop, or 1206 * to lock for each call to remove_journal_hash? 1207 */ 1208 while (cn) { 1209 if (cn->blocknr != 0) { 1210 if (debug) { 1211 reiserfs_warning(sb, "reiserfs-2201", 1212 "block %u, bh is %d, state %ld", 1213 cn->blocknr, cn->bh ? 1 : 0, 1214 cn->state); 1215 } 1216 cn->state = 0; 1217 remove_journal_hash(sb, journal->j_list_hash_table, 1218 jl, cn->blocknr, 1); 1219 } 1220 last = cn; 1221 cn = cn->next; 1222 free_cnode(sb, last); 1223 } 1224 jl->j_realblock = NULL; 1225 } 1226 1227 /* 1228 * if this timestamp is greater than the timestamp we wrote last to the 1229 * header block, write it to the header block. once this is done, I can 1230 * safely say the log area for this transaction won't ever be replayed, 1231 * and I can start releasing blocks in this transaction for reuse as data 1232 * blocks. called by flush_journal_list, before it calls 1233 * remove_all_from_journal_list 1234 */ 1235 static int _update_journal_header_block(struct super_block *sb, 1236 unsigned long offset, 1237 unsigned int trans_id) 1238 { 1239 struct reiserfs_journal_header *jh; 1240 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1241 int depth; 1242 1243 if (reiserfs_is_journal_aborted(journal)) 1244 return -EIO; 1245 1246 if (trans_id >= journal->j_last_flush_trans_id) { 1247 if (buffer_locked((journal->j_header_bh))) { 1248 depth = reiserfs_write_unlock_nested(sb); 1249 __wait_on_buffer(journal->j_header_bh); 1250 reiserfs_write_lock_nested(sb, depth); 1251 if (unlikely(!buffer_uptodate(journal->j_header_bh))) { 1252 #ifdef CONFIG_REISERFS_CHECK 1253 reiserfs_warning(sb, "journal-699", 1254 "buffer write failed"); 1255 #endif 1256 return -EIO; 1257 } 1258 } 1259 journal->j_last_flush_trans_id = trans_id; 1260 journal->j_first_unflushed_offset = offset; 1261 jh = (struct reiserfs_journal_header *)(journal->j_header_bh-> 1262 b_data); 1263 jh->j_last_flush_trans_id = cpu_to_le32(trans_id); 1264 jh->j_first_unflushed_offset = cpu_to_le32(offset); 1265 jh->j_mount_id = cpu_to_le32(journal->j_mount_id); 1266 1267 set_buffer_dirty(journal->j_header_bh); 1268 depth = reiserfs_write_unlock_nested(sb); 1269 1270 if (reiserfs_barrier_flush(sb)) 1271 __sync_dirty_buffer(journal->j_header_bh, 1272 REQ_SYNC | REQ_PREFLUSH | REQ_FUA); 1273 else 1274 sync_dirty_buffer(journal->j_header_bh); 1275 1276 reiserfs_write_lock_nested(sb, depth); 1277 if (!buffer_uptodate(journal->j_header_bh)) { 1278 reiserfs_warning(sb, "journal-837", 1279 "IO error during journal replay"); 1280 return -EIO; 1281 } 1282 } 1283 return 0; 1284 } 1285 1286 static int update_journal_header_block(struct super_block *sb, 1287 unsigned long offset, 1288 unsigned int trans_id) 1289 { 1290 return _update_journal_header_block(sb, offset, trans_id); 1291 } 1292 1293 /* 1294 ** flush any and all journal lists older than you are 1295 ** can only be called from flush_journal_list 1296 */ 1297 static int flush_older_journal_lists(struct super_block *sb, 1298 struct reiserfs_journal_list *jl) 1299 { 1300 struct list_head *entry; 1301 struct reiserfs_journal_list *other_jl; 1302 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1303 unsigned int trans_id = jl->j_trans_id; 1304 1305 /* 1306 * we know we are the only ones flushing things, no extra race 1307 * protection is required. 1308 */ 1309 restart: 1310 entry = journal->j_journal_list.next; 1311 /* Did we wrap? */ 1312 if (entry == &journal->j_journal_list) 1313 return 0; 1314 other_jl = JOURNAL_LIST_ENTRY(entry); 1315 if (other_jl->j_trans_id < trans_id) { 1316 BUG_ON(other_jl->j_refcount <= 0); 1317 /* do not flush all */ 1318 flush_journal_list(sb, other_jl, 0); 1319 1320 /* other_jl is now deleted from the list */ 1321 goto restart; 1322 } 1323 return 0; 1324 } 1325 1326 static void del_from_work_list(struct super_block *s, 1327 struct reiserfs_journal_list *jl) 1328 { 1329 struct reiserfs_journal *journal = SB_JOURNAL(s); 1330 if (!list_empty(&jl->j_working_list)) { 1331 list_del_init(&jl->j_working_list); 1332 journal->j_num_work_lists--; 1333 } 1334 } 1335 1336 /* 1337 * flush a journal list, both commit and real blocks 1338 * 1339 * always set flushall to 1, unless you are calling from inside 1340 * flush_journal_list 1341 * 1342 * IMPORTANT. This can only be called while there are no journal writers, 1343 * and the journal is locked. That means it can only be called from 1344 * do_journal_end, or by journal_release 1345 */ 1346 static int flush_journal_list(struct super_block *s, 1347 struct reiserfs_journal_list *jl, int flushall) 1348 { 1349 struct reiserfs_journal_list *pjl; 1350 struct reiserfs_journal_cnode *cn; 1351 int count; 1352 int was_jwait = 0; 1353 int was_dirty = 0; 1354 struct buffer_head *saved_bh; 1355 unsigned long j_len_saved = jl->j_len; 1356 struct reiserfs_journal *journal = SB_JOURNAL(s); 1357 int err = 0; 1358 int depth; 1359 1360 BUG_ON(j_len_saved <= 0); 1361 1362 if (atomic_read(&journal->j_wcount) != 0) { 1363 reiserfs_warning(s, "clm-2048", "called with wcount %d", 1364 atomic_read(&journal->j_wcount)); 1365 } 1366 1367 /* if flushall == 0, the lock is already held */ 1368 if (flushall) { 1369 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); 1370 } else if (mutex_trylock(&journal->j_flush_mutex)) { 1371 BUG(); 1372 } 1373 1374 count = 0; 1375 if (j_len_saved > journal->j_trans_max) { 1376 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu", 1377 j_len_saved, jl->j_trans_id); 1378 return 0; 1379 } 1380 1381 /* if all the work is already done, get out of here */ 1382 if (atomic_read(&jl->j_nonzerolen) <= 0 && 1383 atomic_read(&jl->j_commit_left) <= 0) { 1384 goto flush_older_and_return; 1385 } 1386 1387 /* 1388 * start by putting the commit list on disk. This will also flush 1389 * the commit lists of any olders transactions 1390 */ 1391 flush_commit_list(s, jl, 1); 1392 1393 if (!(jl->j_state & LIST_DIRTY) 1394 && !reiserfs_is_journal_aborted(journal)) 1395 BUG(); 1396 1397 /* are we done now? */ 1398 if (atomic_read(&jl->j_nonzerolen) <= 0 && 1399 atomic_read(&jl->j_commit_left) <= 0) { 1400 goto flush_older_and_return; 1401 } 1402 1403 /* 1404 * loop through each cnode, see if we need to write it, 1405 * or wait on a more recent transaction, or just ignore it 1406 */ 1407 if (atomic_read(&journal->j_wcount) != 0) { 1408 reiserfs_panic(s, "journal-844", "journal list is flushing, " 1409 "wcount is not 0"); 1410 } 1411 cn = jl->j_realblock; 1412 while (cn) { 1413 was_jwait = 0; 1414 was_dirty = 0; 1415 saved_bh = NULL; 1416 /* blocknr of 0 is no longer in the hash, ignore it */ 1417 if (cn->blocknr == 0) { 1418 goto free_cnode; 1419 } 1420 1421 /* 1422 * This transaction failed commit. 1423 * Don't write out to the disk 1424 */ 1425 if (!(jl->j_state & LIST_DIRTY)) 1426 goto free_cnode; 1427 1428 pjl = find_newer_jl_for_cn(cn); 1429 /* 1430 * the order is important here. We check pjl to make sure we 1431 * don't clear BH_JDirty_wait if we aren't the one writing this 1432 * block to disk 1433 */ 1434 if (!pjl && cn->bh) { 1435 saved_bh = cn->bh; 1436 1437 /* 1438 * we do this to make sure nobody releases the 1439 * buffer while we are working with it 1440 */ 1441 get_bh(saved_bh); 1442 1443 if (buffer_journal_dirty(saved_bh)) { 1444 BUG_ON(!can_dirty(cn)); 1445 was_jwait = 1; 1446 was_dirty = 1; 1447 } else if (can_dirty(cn)) { 1448 /* 1449 * everything with !pjl && jwait 1450 * should be writable 1451 */ 1452 BUG(); 1453 } 1454 } 1455 1456 /* 1457 * if someone has this block in a newer transaction, just make 1458 * sure they are committed, and don't try writing it to disk 1459 */ 1460 if (pjl) { 1461 if (atomic_read(&pjl->j_commit_left)) 1462 flush_commit_list(s, pjl, 1); 1463 goto free_cnode; 1464 } 1465 1466 /* 1467 * bh == NULL when the block got to disk on its own, OR, 1468 * the block got freed in a future transaction 1469 */ 1470 if (saved_bh == NULL) { 1471 goto free_cnode; 1472 } 1473 1474 /* 1475 * this should never happen. kupdate_one_transaction has 1476 * this list locked while it works, so we should never see a 1477 * buffer here that is not marked JDirty_wait 1478 */ 1479 if ((!was_jwait) && !buffer_locked(saved_bh)) { 1480 reiserfs_warning(s, "journal-813", 1481 "BAD! buffer %llu %cdirty %cjwait, " 1482 "not in a newer transaction", 1483 (unsigned long long)saved_bh-> 1484 b_blocknr, was_dirty ? ' ' : '!', 1485 was_jwait ? ' ' : '!'); 1486 } 1487 if (was_dirty) { 1488 /* 1489 * we inc again because saved_bh gets decremented 1490 * at free_cnode 1491 */ 1492 get_bh(saved_bh); 1493 set_bit(BLOCK_NEEDS_FLUSH, &cn->state); 1494 lock_buffer(saved_bh); 1495 BUG_ON(cn->blocknr != saved_bh->b_blocknr); 1496 if (buffer_dirty(saved_bh)) 1497 submit_logged_buffer(saved_bh); 1498 else 1499 unlock_buffer(saved_bh); 1500 count++; 1501 } else { 1502 reiserfs_warning(s, "clm-2082", 1503 "Unable to flush buffer %llu in %s", 1504 (unsigned long long)saved_bh-> 1505 b_blocknr, __func__); 1506 } 1507 free_cnode: 1508 cn = cn->next; 1509 if (saved_bh) { 1510 /* 1511 * we incremented this to keep others from 1512 * taking the buffer head away 1513 */ 1514 put_bh(saved_bh); 1515 if (atomic_read(&saved_bh->b_count) < 0) { 1516 reiserfs_warning(s, "journal-945", 1517 "saved_bh->b_count < 0"); 1518 } 1519 } 1520 } 1521 if (count > 0) { 1522 cn = jl->j_realblock; 1523 while (cn) { 1524 if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) { 1525 if (!cn->bh) { 1526 reiserfs_panic(s, "journal-1011", 1527 "cn->bh is NULL"); 1528 } 1529 1530 depth = reiserfs_write_unlock_nested(s); 1531 __wait_on_buffer(cn->bh); 1532 reiserfs_write_lock_nested(s, depth); 1533 1534 if (!cn->bh) { 1535 reiserfs_panic(s, "journal-1012", 1536 "cn->bh is NULL"); 1537 } 1538 if (unlikely(!buffer_uptodate(cn->bh))) { 1539 #ifdef CONFIG_REISERFS_CHECK 1540 reiserfs_warning(s, "journal-949", 1541 "buffer write failed"); 1542 #endif 1543 err = -EIO; 1544 } 1545 /* 1546 * note, we must clear the JDirty_wait bit 1547 * after the up to date check, otherwise we 1548 * race against our flushpage routine 1549 */ 1550 BUG_ON(!test_clear_buffer_journal_dirty 1551 (cn->bh)); 1552 1553 /* drop one ref for us */ 1554 put_bh(cn->bh); 1555 /* drop one ref for journal_mark_dirty */ 1556 release_buffer_page(cn->bh); 1557 } 1558 cn = cn->next; 1559 } 1560 } 1561 1562 if (err) 1563 reiserfs_abort(s, -EIO, 1564 "Write error while pushing transaction to disk in %s", 1565 __func__); 1566 flush_older_and_return: 1567 1568 /* 1569 * before we can update the journal header block, we _must_ flush all 1570 * real blocks from all older transactions to disk. This is because 1571 * once the header block is updated, this transaction will not be 1572 * replayed after a crash 1573 */ 1574 if (flushall) { 1575 flush_older_journal_lists(s, jl); 1576 } 1577 1578 err = journal->j_errno; 1579 /* 1580 * before we can remove everything from the hash tables for this 1581 * transaction, we must make sure it can never be replayed 1582 * 1583 * since we are only called from do_journal_end, we know for sure there 1584 * are no allocations going on while we are flushing journal lists. So, 1585 * we only need to update the journal header block for the last list 1586 * being flushed 1587 */ 1588 if (!err && flushall) { 1589 err = 1590 update_journal_header_block(s, 1591 (jl->j_start + jl->j_len + 1592 2) % SB_ONDISK_JOURNAL_SIZE(s), 1593 jl->j_trans_id); 1594 if (err) 1595 reiserfs_abort(s, -EIO, 1596 "Write error while updating journal header in %s", 1597 __func__); 1598 } 1599 remove_all_from_journal_list(s, jl, 0); 1600 list_del_init(&jl->j_list); 1601 journal->j_num_lists--; 1602 del_from_work_list(s, jl); 1603 1604 if (journal->j_last_flush_id != 0 && 1605 (jl->j_trans_id - journal->j_last_flush_id) != 1) { 1606 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu", 1607 journal->j_last_flush_id, jl->j_trans_id); 1608 } 1609 journal->j_last_flush_id = jl->j_trans_id; 1610 1611 /* 1612 * not strictly required since we are freeing the list, but it should 1613 * help find code using dead lists later on 1614 */ 1615 jl->j_len = 0; 1616 atomic_set(&jl->j_nonzerolen, 0); 1617 jl->j_start = 0; 1618 jl->j_realblock = NULL; 1619 jl->j_commit_bh = NULL; 1620 jl->j_trans_id = 0; 1621 jl->j_state = 0; 1622 put_journal_list(s, jl); 1623 if (flushall) 1624 mutex_unlock(&journal->j_flush_mutex); 1625 return err; 1626 } 1627 1628 static int write_one_transaction(struct super_block *s, 1629 struct reiserfs_journal_list *jl, 1630 struct buffer_chunk *chunk) 1631 { 1632 struct reiserfs_journal_cnode *cn; 1633 int ret = 0; 1634 1635 jl->j_state |= LIST_TOUCHED; 1636 del_from_work_list(s, jl); 1637 if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) { 1638 return 0; 1639 } 1640 1641 cn = jl->j_realblock; 1642 while (cn) { 1643 /* 1644 * if the blocknr == 0, this has been cleared from the hash, 1645 * skip it 1646 */ 1647 if (cn->blocknr == 0) { 1648 goto next; 1649 } 1650 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) { 1651 struct buffer_head *tmp_bh; 1652 /* 1653 * we can race against journal_mark_freed when we try 1654 * to lock_buffer(cn->bh), so we have to inc the buffer 1655 * count, and recheck things after locking 1656 */ 1657 tmp_bh = cn->bh; 1658 get_bh(tmp_bh); 1659 lock_buffer(tmp_bh); 1660 if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) { 1661 if (!buffer_journal_dirty(tmp_bh) || 1662 buffer_journal_prepared(tmp_bh)) 1663 BUG(); 1664 add_to_chunk(chunk, tmp_bh, NULL, write_chunk); 1665 ret++; 1666 } else { 1667 /* note, cn->bh might be null now */ 1668 unlock_buffer(tmp_bh); 1669 } 1670 put_bh(tmp_bh); 1671 } 1672 next: 1673 cn = cn->next; 1674 cond_resched(); 1675 } 1676 return ret; 1677 } 1678 1679 /* used by flush_commit_list */ 1680 static void dirty_one_transaction(struct super_block *s, 1681 struct reiserfs_journal_list *jl) 1682 { 1683 struct reiserfs_journal_cnode *cn; 1684 struct reiserfs_journal_list *pjl; 1685 1686 jl->j_state |= LIST_DIRTY; 1687 cn = jl->j_realblock; 1688 while (cn) { 1689 /* 1690 * look for a more recent transaction that logged this 1691 * buffer. Only the most recent transaction with a buffer in 1692 * it is allowed to send that buffer to disk 1693 */ 1694 pjl = find_newer_jl_for_cn(cn); 1695 if (!pjl && cn->blocknr && cn->bh 1696 && buffer_journal_dirty(cn->bh)) { 1697 BUG_ON(!can_dirty(cn)); 1698 /* 1699 * if the buffer is prepared, it will either be logged 1700 * or restored. If restored, we need to make sure 1701 * it actually gets marked dirty 1702 */ 1703 clear_buffer_journal_new(cn->bh); 1704 if (buffer_journal_prepared(cn->bh)) { 1705 set_buffer_journal_restore_dirty(cn->bh); 1706 } else { 1707 set_buffer_journal_test(cn->bh); 1708 mark_buffer_dirty(cn->bh); 1709 } 1710 } 1711 cn = cn->next; 1712 } 1713 } 1714 1715 static int kupdate_transactions(struct super_block *s, 1716 struct reiserfs_journal_list *jl, 1717 struct reiserfs_journal_list **next_jl, 1718 unsigned int *next_trans_id, 1719 int num_blocks, int num_trans) 1720 { 1721 int ret = 0; 1722 int written = 0; 1723 int transactions_flushed = 0; 1724 unsigned int orig_trans_id = jl->j_trans_id; 1725 struct buffer_chunk chunk; 1726 struct list_head *entry; 1727 struct reiserfs_journal *journal = SB_JOURNAL(s); 1728 chunk.nr = 0; 1729 1730 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); 1731 if (!journal_list_still_alive(s, orig_trans_id)) { 1732 goto done; 1733 } 1734 1735 /* 1736 * we've got j_flush_mutex held, nobody is going to delete any 1737 * of these lists out from underneath us 1738 */ 1739 while ((num_trans && transactions_flushed < num_trans) || 1740 (!num_trans && written < num_blocks)) { 1741 1742 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) || 1743 atomic_read(&jl->j_commit_left) 1744 || !(jl->j_state & LIST_DIRTY)) { 1745 del_from_work_list(s, jl); 1746 break; 1747 } 1748 ret = write_one_transaction(s, jl, &chunk); 1749 1750 if (ret < 0) 1751 goto done; 1752 transactions_flushed++; 1753 written += ret; 1754 entry = jl->j_list.next; 1755 1756 /* did we wrap? */ 1757 if (entry == &journal->j_journal_list) { 1758 break; 1759 } 1760 jl = JOURNAL_LIST_ENTRY(entry); 1761 1762 /* don't bother with older transactions */ 1763 if (jl->j_trans_id <= orig_trans_id) 1764 break; 1765 } 1766 if (chunk.nr) { 1767 write_chunk(&chunk); 1768 } 1769 1770 done: 1771 mutex_unlock(&journal->j_flush_mutex); 1772 return ret; 1773 } 1774 1775 /* 1776 * for o_sync and fsync heavy applications, they tend to use 1777 * all the journa list slots with tiny transactions. These 1778 * trigger lots and lots of calls to update the header block, which 1779 * adds seeks and slows things down. 1780 * 1781 * This function tries to clear out a large chunk of the journal lists 1782 * at once, which makes everything faster since only the newest journal 1783 * list updates the header block 1784 */ 1785 static int flush_used_journal_lists(struct super_block *s, 1786 struct reiserfs_journal_list *jl) 1787 { 1788 unsigned long len = 0; 1789 unsigned long cur_len; 1790 int i; 1791 int limit = 256; 1792 struct reiserfs_journal_list *tjl; 1793 struct reiserfs_journal_list *flush_jl; 1794 unsigned int trans_id; 1795 struct reiserfs_journal *journal = SB_JOURNAL(s); 1796 1797 flush_jl = tjl = jl; 1798 1799 /* in data logging mode, try harder to flush a lot of blocks */ 1800 if (reiserfs_data_log(s)) 1801 limit = 1024; 1802 /* flush for 256 transactions or limit blocks, whichever comes first */ 1803 for (i = 0; i < 256 && len < limit; i++) { 1804 if (atomic_read(&tjl->j_commit_left) || 1805 tjl->j_trans_id < jl->j_trans_id) { 1806 break; 1807 } 1808 cur_len = atomic_read(&tjl->j_nonzerolen); 1809 if (cur_len > 0) { 1810 tjl->j_state &= ~LIST_TOUCHED; 1811 } 1812 len += cur_len; 1813 flush_jl = tjl; 1814 if (tjl->j_list.next == &journal->j_journal_list) 1815 break; 1816 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next); 1817 } 1818 get_journal_list(jl); 1819 get_journal_list(flush_jl); 1820 1821 /* 1822 * try to find a group of blocks we can flush across all the 1823 * transactions, but only bother if we've actually spanned 1824 * across multiple lists 1825 */ 1826 if (flush_jl != jl) 1827 kupdate_transactions(s, jl, &tjl, &trans_id, len, i); 1828 1829 flush_journal_list(s, flush_jl, 1); 1830 put_journal_list(s, flush_jl); 1831 put_journal_list(s, jl); 1832 return 0; 1833 } 1834 1835 /* 1836 * removes any nodes in table with name block and dev as bh. 1837 * only touchs the hnext and hprev pointers. 1838 */ 1839 static void remove_journal_hash(struct super_block *sb, 1840 struct reiserfs_journal_cnode **table, 1841 struct reiserfs_journal_list *jl, 1842 unsigned long block, int remove_freed) 1843 { 1844 struct reiserfs_journal_cnode *cur; 1845 struct reiserfs_journal_cnode **head; 1846 1847 head = &(journal_hash(table, sb, block)); 1848 if (!head) { 1849 return; 1850 } 1851 cur = *head; 1852 while (cur) { 1853 if (cur->blocknr == block && cur->sb == sb 1854 && (jl == NULL || jl == cur->jlist) 1855 && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) { 1856 if (cur->hnext) { 1857 cur->hnext->hprev = cur->hprev; 1858 } 1859 if (cur->hprev) { 1860 cur->hprev->hnext = cur->hnext; 1861 } else { 1862 *head = cur->hnext; 1863 } 1864 cur->blocknr = 0; 1865 cur->sb = NULL; 1866 cur->state = 0; 1867 /* 1868 * anybody who clears the cur->bh will also 1869 * dec the nonzerolen 1870 */ 1871 if (cur->bh && cur->jlist) 1872 atomic_dec(&cur->jlist->j_nonzerolen); 1873 cur->bh = NULL; 1874 cur->jlist = NULL; 1875 } 1876 cur = cur->hnext; 1877 } 1878 } 1879 1880 static void free_journal_ram(struct super_block *sb) 1881 { 1882 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1883 kfree(journal->j_current_jl); 1884 journal->j_num_lists--; 1885 1886 vfree(journal->j_cnode_free_orig); 1887 free_list_bitmaps(sb, journal->j_list_bitmap); 1888 free_bitmap_nodes(sb); /* must be after free_list_bitmaps */ 1889 if (journal->j_header_bh) { 1890 brelse(journal->j_header_bh); 1891 } 1892 /* 1893 * j_header_bh is on the journal dev, make sure 1894 * not to release the journal dev until we brelse j_header_bh 1895 */ 1896 release_journal_dev(sb, journal); 1897 vfree(journal); 1898 } 1899 1900 /* 1901 * call on unmount. Only set error to 1 if you haven't made your way out 1902 * of read_super() yet. Any other caller must keep error at 0. 1903 */ 1904 static int do_journal_release(struct reiserfs_transaction_handle *th, 1905 struct super_block *sb, int error) 1906 { 1907 struct reiserfs_transaction_handle myth; 1908 struct reiserfs_journal *journal = SB_JOURNAL(sb); 1909 1910 /* 1911 * we only want to flush out transactions if we were 1912 * called with error == 0 1913 */ 1914 if (!error && !sb_rdonly(sb)) { 1915 /* end the current trans */ 1916 BUG_ON(!th->t_trans_id); 1917 do_journal_end(th, FLUSH_ALL); 1918 1919 /* 1920 * make sure something gets logged to force 1921 * our way into the flush code 1922 */ 1923 if (!journal_join(&myth, sb)) { 1924 reiserfs_prepare_for_journal(sb, 1925 SB_BUFFER_WITH_SB(sb), 1926 1); 1927 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb)); 1928 do_journal_end(&myth, FLUSH_ALL); 1929 } 1930 } 1931 1932 /* this also catches errors during the do_journal_end above */ 1933 if (!error && reiserfs_is_journal_aborted(journal)) { 1934 memset(&myth, 0, sizeof(myth)); 1935 if (!journal_join_abort(&myth, sb)) { 1936 reiserfs_prepare_for_journal(sb, 1937 SB_BUFFER_WITH_SB(sb), 1938 1); 1939 journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb)); 1940 do_journal_end(&myth, FLUSH_ALL); 1941 } 1942 } 1943 1944 1945 /* 1946 * We must release the write lock here because 1947 * the workqueue job (flush_async_commit) needs this lock 1948 */ 1949 reiserfs_write_unlock(sb); 1950 1951 /* 1952 * Cancel flushing of old commits. Note that neither of these works 1953 * will be requeued because superblock is being shutdown and doesn't 1954 * have SB_ACTIVE set. 1955 */ 1956 reiserfs_cancel_old_flush(sb); 1957 /* wait for all commits to finish */ 1958 cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work); 1959 1960 free_journal_ram(sb); 1961 1962 reiserfs_write_lock(sb); 1963 1964 return 0; 1965 } 1966 1967 /* * call on unmount. flush all journal trans, release all alloc'd ram */ 1968 int journal_release(struct reiserfs_transaction_handle *th, 1969 struct super_block *sb) 1970 { 1971 return do_journal_release(th, sb, 0); 1972 } 1973 1974 /* only call from an error condition inside reiserfs_read_super! */ 1975 int journal_release_error(struct reiserfs_transaction_handle *th, 1976 struct super_block *sb) 1977 { 1978 return do_journal_release(th, sb, 1); 1979 } 1980 1981 /* 1982 * compares description block with commit block. 1983 * returns 1 if they differ, 0 if they are the same 1984 */ 1985 static int journal_compare_desc_commit(struct super_block *sb, 1986 struct reiserfs_journal_desc *desc, 1987 struct reiserfs_journal_commit *commit) 1988 { 1989 if (get_commit_trans_id(commit) != get_desc_trans_id(desc) || 1990 get_commit_trans_len(commit) != get_desc_trans_len(desc) || 1991 get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max || 1992 get_commit_trans_len(commit) <= 0) { 1993 return 1; 1994 } 1995 return 0; 1996 } 1997 1998 /* 1999 * returns 0 if it did not find a description block 2000 * returns -1 if it found a corrupt commit block 2001 * returns 1 if both desc and commit were valid 2002 * NOTE: only called during fs mount 2003 */ 2004 static int journal_transaction_is_valid(struct super_block *sb, 2005 struct buffer_head *d_bh, 2006 unsigned int *oldest_invalid_trans_id, 2007 unsigned long *newest_mount_id) 2008 { 2009 struct reiserfs_journal_desc *desc; 2010 struct reiserfs_journal_commit *commit; 2011 struct buffer_head *c_bh; 2012 unsigned long offset; 2013 2014 if (!d_bh) 2015 return 0; 2016 2017 desc = (struct reiserfs_journal_desc *)d_bh->b_data; 2018 if (get_desc_trans_len(desc) > 0 2019 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) { 2020 if (oldest_invalid_trans_id && *oldest_invalid_trans_id 2021 && get_desc_trans_id(desc) > *oldest_invalid_trans_id) { 2022 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2023 "journal-986: transaction " 2024 "is valid returning because trans_id %d is greater than " 2025 "oldest_invalid %lu", 2026 get_desc_trans_id(desc), 2027 *oldest_invalid_trans_id); 2028 return 0; 2029 } 2030 if (newest_mount_id 2031 && *newest_mount_id > get_desc_mount_id(desc)) { 2032 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2033 "journal-1087: transaction " 2034 "is valid returning because mount_id %d is less than " 2035 "newest_mount_id %lu", 2036 get_desc_mount_id(desc), 2037 *newest_mount_id); 2038 return -1; 2039 } 2040 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) { 2041 reiserfs_warning(sb, "journal-2018", 2042 "Bad transaction length %d " 2043 "encountered, ignoring transaction", 2044 get_desc_trans_len(desc)); 2045 return -1; 2046 } 2047 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2048 2049 /* 2050 * ok, we have a journal description block, 2051 * let's see if the transaction was valid 2052 */ 2053 c_bh = 2054 journal_bread(sb, 2055 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2056 ((offset + get_desc_trans_len(desc) + 2057 1) % SB_ONDISK_JOURNAL_SIZE(sb))); 2058 if (!c_bh) 2059 return 0; 2060 commit = (struct reiserfs_journal_commit *)c_bh->b_data; 2061 if (journal_compare_desc_commit(sb, desc, commit)) { 2062 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2063 "journal_transaction_is_valid, commit offset %ld had bad " 2064 "time %d or length %d", 2065 c_bh->b_blocknr - 2066 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2067 get_commit_trans_id(commit), 2068 get_commit_trans_len(commit)); 2069 brelse(c_bh); 2070 if (oldest_invalid_trans_id) { 2071 *oldest_invalid_trans_id = 2072 get_desc_trans_id(desc); 2073 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2074 "journal-1004: " 2075 "transaction_is_valid setting oldest invalid trans_id " 2076 "to %d", 2077 get_desc_trans_id(desc)); 2078 } 2079 return -1; 2080 } 2081 brelse(c_bh); 2082 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2083 "journal-1006: found valid " 2084 "transaction start offset %llu, len %d id %d", 2085 d_bh->b_blocknr - 2086 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2087 get_desc_trans_len(desc), 2088 get_desc_trans_id(desc)); 2089 return 1; 2090 } else { 2091 return 0; 2092 } 2093 } 2094 2095 static void brelse_array(struct buffer_head **heads, int num) 2096 { 2097 int i; 2098 for (i = 0; i < num; i++) { 2099 brelse(heads[i]); 2100 } 2101 } 2102 2103 /* 2104 * given the start, and values for the oldest acceptable transactions, 2105 * this either reads in a replays a transaction, or returns because the 2106 * transaction is invalid, or too old. 2107 * NOTE: only called during fs mount 2108 */ 2109 static int journal_read_transaction(struct super_block *sb, 2110 unsigned long cur_dblock, 2111 unsigned long oldest_start, 2112 unsigned int oldest_trans_id, 2113 unsigned long newest_mount_id) 2114 { 2115 struct reiserfs_journal *journal = SB_JOURNAL(sb); 2116 struct reiserfs_journal_desc *desc; 2117 struct reiserfs_journal_commit *commit; 2118 unsigned int trans_id = 0; 2119 struct buffer_head *c_bh; 2120 struct buffer_head *d_bh; 2121 struct buffer_head **log_blocks = NULL; 2122 struct buffer_head **real_blocks = NULL; 2123 unsigned int trans_offset; 2124 int i; 2125 int trans_half; 2126 2127 d_bh = journal_bread(sb, cur_dblock); 2128 if (!d_bh) 2129 return 1; 2130 desc = (struct reiserfs_journal_desc *)d_bh->b_data; 2131 trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2132 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: " 2133 "journal_read_transaction, offset %llu, len %d mount_id %d", 2134 d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2135 get_desc_trans_len(desc), get_desc_mount_id(desc)); 2136 if (get_desc_trans_id(desc) < oldest_trans_id) { 2137 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: " 2138 "journal_read_trans skipping because %lu is too old", 2139 cur_dblock - 2140 SB_ONDISK_JOURNAL_1st_BLOCK(sb)); 2141 brelse(d_bh); 2142 return 1; 2143 } 2144 if (get_desc_mount_id(desc) != newest_mount_id) { 2145 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: " 2146 "journal_read_trans skipping because %d is != " 2147 "newest_mount_id %lu", get_desc_mount_id(desc), 2148 newest_mount_id); 2149 brelse(d_bh); 2150 return 1; 2151 } 2152 c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2153 ((trans_offset + get_desc_trans_len(desc) + 1) % 2154 SB_ONDISK_JOURNAL_SIZE(sb))); 2155 if (!c_bh) { 2156 brelse(d_bh); 2157 return 1; 2158 } 2159 commit = (struct reiserfs_journal_commit *)c_bh->b_data; 2160 if (journal_compare_desc_commit(sb, desc, commit)) { 2161 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2162 "journal_read_transaction, " 2163 "commit offset %llu had bad time %d or length %d", 2164 c_bh->b_blocknr - 2165 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2166 get_commit_trans_id(commit), 2167 get_commit_trans_len(commit)); 2168 brelse(c_bh); 2169 brelse(d_bh); 2170 return 1; 2171 } 2172 2173 if (bdev_read_only(sb->s_bdev)) { 2174 reiserfs_warning(sb, "clm-2076", 2175 "device is readonly, unable to replay log"); 2176 brelse(c_bh); 2177 brelse(d_bh); 2178 return -EROFS; 2179 } 2180 2181 trans_id = get_desc_trans_id(desc); 2182 /* 2183 * now we know we've got a good transaction, and it was 2184 * inside the valid time ranges 2185 */ 2186 log_blocks = kmalloc_array(get_desc_trans_len(desc), 2187 sizeof(struct buffer_head *), 2188 GFP_NOFS); 2189 real_blocks = kmalloc_array(get_desc_trans_len(desc), 2190 sizeof(struct buffer_head *), 2191 GFP_NOFS); 2192 if (!log_blocks || !real_blocks) { 2193 brelse(c_bh); 2194 brelse(d_bh); 2195 kfree(log_blocks); 2196 kfree(real_blocks); 2197 reiserfs_warning(sb, "journal-1169", 2198 "kmalloc failed, unable to mount FS"); 2199 return -1; 2200 } 2201 /* get all the buffer heads */ 2202 trans_half = journal_trans_half(sb->s_blocksize); 2203 for (i = 0; i < get_desc_trans_len(desc); i++) { 2204 log_blocks[i] = 2205 journal_getblk(sb, 2206 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2207 (trans_offset + 1 + 2208 i) % SB_ONDISK_JOURNAL_SIZE(sb)); 2209 if (i < trans_half) { 2210 real_blocks[i] = 2211 sb_getblk(sb, 2212 le32_to_cpu(desc->j_realblock[i])); 2213 } else { 2214 real_blocks[i] = 2215 sb_getblk(sb, 2216 le32_to_cpu(commit-> 2217 j_realblock[i - trans_half])); 2218 } 2219 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) { 2220 reiserfs_warning(sb, "journal-1207", 2221 "REPLAY FAILURE fsck required! " 2222 "Block to replay is outside of " 2223 "filesystem"); 2224 goto abort_replay; 2225 } 2226 /* make sure we don't try to replay onto log or reserved area */ 2227 if (is_block_in_log_or_reserved_area 2228 (sb, real_blocks[i]->b_blocknr)) { 2229 reiserfs_warning(sb, "journal-1204", 2230 "REPLAY FAILURE fsck required! " 2231 "Trying to replay onto a log block"); 2232 abort_replay: 2233 brelse_array(log_blocks, i); 2234 brelse_array(real_blocks, i); 2235 brelse(c_bh); 2236 brelse(d_bh); 2237 kfree(log_blocks); 2238 kfree(real_blocks); 2239 return -1; 2240 } 2241 } 2242 /* read in the log blocks, memcpy to the corresponding real block */ 2243 bh_read_batch(get_desc_trans_len(desc), log_blocks); 2244 for (i = 0; i < get_desc_trans_len(desc); i++) { 2245 2246 wait_on_buffer(log_blocks[i]); 2247 if (!buffer_uptodate(log_blocks[i])) { 2248 reiserfs_warning(sb, "journal-1212", 2249 "REPLAY FAILURE fsck required! " 2250 "buffer write failed"); 2251 brelse_array(log_blocks + i, 2252 get_desc_trans_len(desc) - i); 2253 brelse_array(real_blocks, get_desc_trans_len(desc)); 2254 brelse(c_bh); 2255 brelse(d_bh); 2256 kfree(log_blocks); 2257 kfree(real_blocks); 2258 return -1; 2259 } 2260 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, 2261 real_blocks[i]->b_size); 2262 set_buffer_uptodate(real_blocks[i]); 2263 brelse(log_blocks[i]); 2264 } 2265 /* flush out the real blocks */ 2266 for (i = 0; i < get_desc_trans_len(desc); i++) { 2267 set_buffer_dirty(real_blocks[i]); 2268 write_dirty_buffer(real_blocks[i], 0); 2269 } 2270 for (i = 0; i < get_desc_trans_len(desc); i++) { 2271 wait_on_buffer(real_blocks[i]); 2272 if (!buffer_uptodate(real_blocks[i])) { 2273 reiserfs_warning(sb, "journal-1226", 2274 "REPLAY FAILURE, fsck required! " 2275 "buffer write failed"); 2276 brelse_array(real_blocks + i, 2277 get_desc_trans_len(desc) - i); 2278 brelse(c_bh); 2279 brelse(d_bh); 2280 kfree(log_blocks); 2281 kfree(real_blocks); 2282 return -1; 2283 } 2284 brelse(real_blocks[i]); 2285 } 2286 cur_dblock = 2287 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2288 ((trans_offset + get_desc_trans_len(desc) + 2289 2) % SB_ONDISK_JOURNAL_SIZE(sb)); 2290 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2291 "journal-1095: setting journal " "start to offset %ld", 2292 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb)); 2293 2294 /* 2295 * init starting values for the first transaction, in case 2296 * this is the last transaction to be replayed. 2297 */ 2298 journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2299 journal->j_last_flush_trans_id = trans_id; 2300 journal->j_trans_id = trans_id + 1; 2301 /* check for trans_id overflow */ 2302 if (journal->j_trans_id == 0) 2303 journal->j_trans_id = 10; 2304 brelse(c_bh); 2305 brelse(d_bh); 2306 kfree(log_blocks); 2307 kfree(real_blocks); 2308 return 0; 2309 } 2310 2311 /* 2312 * This function reads blocks starting from block and to max_block of bufsize 2313 * size (but no more than BUFNR blocks at a time). This proved to improve 2314 * mounting speed on self-rebuilding raid5 arrays at least. 2315 * Right now it is only used from journal code. But later we might use it 2316 * from other places. 2317 * Note: Do not use journal_getblk/sb_getblk functions here! 2318 */ 2319 static struct buffer_head *reiserfs_breada(struct block_device *dev, 2320 b_blocknr_t block, int bufsize, 2321 b_blocknr_t max_block) 2322 { 2323 struct buffer_head *bhlist[BUFNR]; 2324 unsigned int blocks = BUFNR; 2325 struct buffer_head *bh; 2326 int i, j; 2327 2328 bh = __getblk(dev, block, bufsize); 2329 if (buffer_uptodate(bh)) 2330 return (bh); 2331 2332 if (block + BUFNR > max_block) { 2333 blocks = max_block - block; 2334 } 2335 bhlist[0] = bh; 2336 j = 1; 2337 for (i = 1; i < blocks; i++) { 2338 bh = __getblk(dev, block + i, bufsize); 2339 if (buffer_uptodate(bh)) { 2340 brelse(bh); 2341 break; 2342 } else 2343 bhlist[j++] = bh; 2344 } 2345 bh = bhlist[0]; 2346 bh_read_nowait(bh, 0); 2347 bh_readahead_batch(j - 1, &bhlist[1], 0); 2348 for (i = 1; i < j; i++) 2349 brelse(bhlist[i]); 2350 wait_on_buffer(bh); 2351 if (buffer_uptodate(bh)) 2352 return bh; 2353 brelse(bh); 2354 return NULL; 2355 } 2356 2357 /* 2358 * read and replay the log 2359 * on a clean unmount, the journal header's next unflushed pointer will be 2360 * to an invalid transaction. This tests that before finding all the 2361 * transactions in the log, which makes normal mount times fast. 2362 * 2363 * After a crash, this starts with the next unflushed transaction, and 2364 * replays until it finds one too old, or invalid. 2365 * 2366 * On exit, it sets things up so the first transaction will work correctly. 2367 * NOTE: only called during fs mount 2368 */ 2369 static int journal_read(struct super_block *sb) 2370 { 2371 struct reiserfs_journal *journal = SB_JOURNAL(sb); 2372 struct reiserfs_journal_desc *desc; 2373 unsigned int oldest_trans_id = 0; 2374 unsigned int oldest_invalid_trans_id = 0; 2375 time64_t start; 2376 unsigned long oldest_start = 0; 2377 unsigned long cur_dblock = 0; 2378 unsigned long newest_mount_id = 9; 2379 struct buffer_head *d_bh; 2380 struct reiserfs_journal_header *jh; 2381 int valid_journal_header = 0; 2382 int replay_count = 0; 2383 int continue_replay = 1; 2384 int ret; 2385 2386 cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb); 2387 reiserfs_info(sb, "checking transaction log (%pg)\n", 2388 journal->j_dev_bd); 2389 start = ktime_get_seconds(); 2390 2391 /* 2392 * step 1, read in the journal header block. Check the transaction 2393 * it says is the first unflushed, and if that transaction is not 2394 * valid, replay is done 2395 */ 2396 journal->j_header_bh = journal_bread(sb, 2397 SB_ONDISK_JOURNAL_1st_BLOCK(sb) 2398 + SB_ONDISK_JOURNAL_SIZE(sb)); 2399 if (!journal->j_header_bh) { 2400 return 1; 2401 } 2402 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data); 2403 if (le32_to_cpu(jh->j_first_unflushed_offset) < 2404 SB_ONDISK_JOURNAL_SIZE(sb) 2405 && le32_to_cpu(jh->j_last_flush_trans_id) > 0) { 2406 oldest_start = 2407 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2408 le32_to_cpu(jh->j_first_unflushed_offset); 2409 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1; 2410 newest_mount_id = le32_to_cpu(jh->j_mount_id); 2411 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2412 "journal-1153: found in " 2413 "header: first_unflushed_offset %d, last_flushed_trans_id " 2414 "%lu", le32_to_cpu(jh->j_first_unflushed_offset), 2415 le32_to_cpu(jh->j_last_flush_trans_id)); 2416 valid_journal_header = 1; 2417 2418 /* 2419 * now, we try to read the first unflushed offset. If it 2420 * is not valid, there is nothing more we can do, and it 2421 * makes no sense to read through the whole log. 2422 */ 2423 d_bh = 2424 journal_bread(sb, 2425 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2426 le32_to_cpu(jh->j_first_unflushed_offset)); 2427 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL); 2428 if (!ret) { 2429 continue_replay = 0; 2430 } 2431 brelse(d_bh); 2432 goto start_log_replay; 2433 } 2434 2435 /* 2436 * ok, there are transactions that need to be replayed. start 2437 * with the first log block, find all the valid transactions, and 2438 * pick out the oldest. 2439 */ 2440 while (continue_replay 2441 && cur_dblock < 2442 (SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2443 SB_ONDISK_JOURNAL_SIZE(sb))) { 2444 /* 2445 * Note that it is required for blocksize of primary fs 2446 * device and journal device to be the same 2447 */ 2448 d_bh = 2449 reiserfs_breada(journal->j_dev_bd, cur_dblock, 2450 sb->s_blocksize, 2451 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2452 SB_ONDISK_JOURNAL_SIZE(sb)); 2453 ret = 2454 journal_transaction_is_valid(sb, d_bh, 2455 &oldest_invalid_trans_id, 2456 &newest_mount_id); 2457 if (ret == 1) { 2458 desc = (struct reiserfs_journal_desc *)d_bh->b_data; 2459 if (oldest_start == 0) { /* init all oldest_ values */ 2460 oldest_trans_id = get_desc_trans_id(desc); 2461 oldest_start = d_bh->b_blocknr; 2462 newest_mount_id = get_desc_mount_id(desc); 2463 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2464 "journal-1179: Setting " 2465 "oldest_start to offset %llu, trans_id %lu", 2466 oldest_start - 2467 SB_ONDISK_JOURNAL_1st_BLOCK 2468 (sb), oldest_trans_id); 2469 } else if (oldest_trans_id > get_desc_trans_id(desc)) { 2470 /* one we just read was older */ 2471 oldest_trans_id = get_desc_trans_id(desc); 2472 oldest_start = d_bh->b_blocknr; 2473 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2474 "journal-1180: Resetting " 2475 "oldest_start to offset %lu, trans_id %lu", 2476 oldest_start - 2477 SB_ONDISK_JOURNAL_1st_BLOCK 2478 (sb), oldest_trans_id); 2479 } 2480 if (newest_mount_id < get_desc_mount_id(desc)) { 2481 newest_mount_id = get_desc_mount_id(desc); 2482 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2483 "journal-1299: Setting " 2484 "newest_mount_id to %d", 2485 get_desc_mount_id(desc)); 2486 } 2487 cur_dblock += get_desc_trans_len(desc) + 2; 2488 } else { 2489 cur_dblock++; 2490 } 2491 brelse(d_bh); 2492 } 2493 2494 start_log_replay: 2495 cur_dblock = oldest_start; 2496 if (oldest_trans_id) { 2497 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2498 "journal-1206: Starting replay " 2499 "from offset %llu, trans_id %lu", 2500 cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2501 oldest_trans_id); 2502 2503 } 2504 replay_count = 0; 2505 while (continue_replay && oldest_trans_id > 0) { 2506 ret = 2507 journal_read_transaction(sb, cur_dblock, oldest_start, 2508 oldest_trans_id, newest_mount_id); 2509 if (ret < 0) { 2510 return ret; 2511 } else if (ret != 0) { 2512 break; 2513 } 2514 cur_dblock = 2515 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start; 2516 replay_count++; 2517 if (cur_dblock == oldest_start) 2518 break; 2519 } 2520 2521 if (oldest_trans_id == 0) { 2522 reiserfs_debug(sb, REISERFS_DEBUG_CODE, 2523 "journal-1225: No valid " "transactions found"); 2524 } 2525 /* 2526 * j_start does not get set correctly if we don't replay any 2527 * transactions. if we had a valid journal_header, set j_start 2528 * to the first unflushed transaction value, copy the trans_id 2529 * from the header 2530 */ 2531 if (valid_journal_header && replay_count == 0) { 2532 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset); 2533 journal->j_trans_id = 2534 le32_to_cpu(jh->j_last_flush_trans_id) + 1; 2535 /* check for trans_id overflow */ 2536 if (journal->j_trans_id == 0) 2537 journal->j_trans_id = 10; 2538 journal->j_last_flush_trans_id = 2539 le32_to_cpu(jh->j_last_flush_trans_id); 2540 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1; 2541 } else { 2542 journal->j_mount_id = newest_mount_id + 1; 2543 } 2544 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " 2545 "newest_mount_id to %lu", journal->j_mount_id); 2546 journal->j_first_unflushed_offset = journal->j_start; 2547 if (replay_count > 0) { 2548 reiserfs_info(sb, 2549 "replayed %d transactions in %lu seconds\n", 2550 replay_count, ktime_get_seconds() - start); 2551 } 2552 /* needed to satisfy the locking in _update_journal_header_block */ 2553 reiserfs_write_lock(sb); 2554 if (!bdev_read_only(sb->s_bdev) && 2555 _update_journal_header_block(sb, journal->j_start, 2556 journal->j_last_flush_trans_id)) { 2557 reiserfs_write_unlock(sb); 2558 /* 2559 * replay failed, caller must call free_journal_ram and abort 2560 * the mount 2561 */ 2562 return -1; 2563 } 2564 reiserfs_write_unlock(sb); 2565 return 0; 2566 } 2567 2568 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s) 2569 { 2570 struct reiserfs_journal_list *jl; 2571 jl = kzalloc(sizeof(struct reiserfs_journal_list), 2572 GFP_NOFS | __GFP_NOFAIL); 2573 INIT_LIST_HEAD(&jl->j_list); 2574 INIT_LIST_HEAD(&jl->j_working_list); 2575 INIT_LIST_HEAD(&jl->j_tail_bh_list); 2576 INIT_LIST_HEAD(&jl->j_bh_list); 2577 mutex_init(&jl->j_commit_mutex); 2578 SB_JOURNAL(s)->j_num_lists++; 2579 get_journal_list(jl); 2580 return jl; 2581 } 2582 2583 static void journal_list_init(struct super_block *sb) 2584 { 2585 SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb); 2586 } 2587 2588 static void release_journal_dev(struct super_block *super, 2589 struct reiserfs_journal *journal) 2590 { 2591 if (journal->j_dev_bd != NULL) { 2592 void *holder = NULL; 2593 2594 if (journal->j_dev_bd->bd_dev != super->s_dev) 2595 holder = journal; 2596 2597 blkdev_put(journal->j_dev_bd, holder); 2598 journal->j_dev_bd = NULL; 2599 } 2600 } 2601 2602 static int journal_init_dev(struct super_block *super, 2603 struct reiserfs_journal *journal, 2604 const char *jdev_name) 2605 { 2606 blk_mode_t blkdev_mode = BLK_OPEN_READ; 2607 void *holder = journal; 2608 int result; 2609 dev_t jdev; 2610 2611 result = 0; 2612 2613 journal->j_dev_bd = NULL; 2614 jdev = SB_ONDISK_JOURNAL_DEVICE(super) ? 2615 new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev; 2616 2617 if (!bdev_read_only(super->s_bdev)) 2618 blkdev_mode |= BLK_OPEN_WRITE; 2619 2620 /* there is no "jdev" option and journal is on separate device */ 2621 if ((!jdev_name || !jdev_name[0])) { 2622 if (jdev == super->s_dev) 2623 holder = NULL; 2624 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode, holder, 2625 NULL); 2626 if (IS_ERR(journal->j_dev_bd)) { 2627 result = PTR_ERR(journal->j_dev_bd); 2628 journal->j_dev_bd = NULL; 2629 reiserfs_warning(super, "sh-458", 2630 "cannot init journal device unknown-block(%u,%u): %i", 2631 MAJOR(jdev), MINOR(jdev), result); 2632 return result; 2633 } else if (jdev != super->s_dev) 2634 set_blocksize(journal->j_dev_bd, super->s_blocksize); 2635 2636 return 0; 2637 } 2638 2639 journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, holder, 2640 NULL); 2641 if (IS_ERR(journal->j_dev_bd)) { 2642 result = PTR_ERR(journal->j_dev_bd); 2643 journal->j_dev_bd = NULL; 2644 reiserfs_warning(super, "sh-457", 2645 "journal_init_dev: Cannot open '%s': %i", 2646 jdev_name, result); 2647 return result; 2648 } 2649 2650 set_blocksize(journal->j_dev_bd, super->s_blocksize); 2651 reiserfs_info(super, 2652 "journal_init_dev: journal device: %pg\n", 2653 journal->j_dev_bd); 2654 return 0; 2655 } 2656 2657 /* 2658 * When creating/tuning a file system user can assign some 2659 * journal params within boundaries which depend on the ratio 2660 * blocksize/standard_blocksize. 2661 * 2662 * For blocks >= standard_blocksize transaction size should 2663 * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more 2664 * then JOURNAL_TRANS_MAX_DEFAULT. 2665 * 2666 * For blocks < standard_blocksize these boundaries should be 2667 * decreased proportionally. 2668 */ 2669 #define REISERFS_STANDARD_BLKSIZE (4096) 2670 2671 static int check_advise_trans_params(struct super_block *sb, 2672 struct reiserfs_journal *journal) 2673 { 2674 if (journal->j_trans_max) { 2675 /* Non-default journal params. Do sanity check for them. */ 2676 int ratio = 1; 2677 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE) 2678 ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize; 2679 2680 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio || 2681 journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio || 2682 SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max < 2683 JOURNAL_MIN_RATIO) { 2684 reiserfs_warning(sb, "sh-462", 2685 "bad transaction max size (%u). " 2686 "FSCK?", journal->j_trans_max); 2687 return 1; 2688 } 2689 if (journal->j_max_batch != (journal->j_trans_max) * 2690 JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) { 2691 reiserfs_warning(sb, "sh-463", 2692 "bad transaction max batch (%u). " 2693 "FSCK?", journal->j_max_batch); 2694 return 1; 2695 } 2696 } else { 2697 /* 2698 * Default journal params. 2699 * The file system was created by old version 2700 * of mkreiserfs, so some fields contain zeros, 2701 * and we need to advise proper values for them 2702 */ 2703 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) { 2704 reiserfs_warning(sb, "sh-464", "bad blocksize (%u)", 2705 sb->s_blocksize); 2706 return 1; 2707 } 2708 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT; 2709 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT; 2710 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE; 2711 } 2712 return 0; 2713 } 2714 2715 /* must be called once on fs mount. calls journal_read for you */ 2716 int journal_init(struct super_block *sb, const char *j_dev_name, 2717 int old_format, unsigned int commit_max_age) 2718 { 2719 int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2; 2720 struct buffer_head *bhjh; 2721 struct reiserfs_super_block *rs; 2722 struct reiserfs_journal_header *jh; 2723 struct reiserfs_journal *journal; 2724 struct reiserfs_journal_list *jl; 2725 int ret; 2726 2727 journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal)); 2728 if (!journal) { 2729 reiserfs_warning(sb, "journal-1256", 2730 "unable to get memory for journal structure"); 2731 return 1; 2732 } 2733 INIT_LIST_HEAD(&journal->j_bitmap_nodes); 2734 INIT_LIST_HEAD(&journal->j_prealloc_list); 2735 INIT_LIST_HEAD(&journal->j_working_list); 2736 INIT_LIST_HEAD(&journal->j_journal_list); 2737 journal->j_persistent_trans = 0; 2738 if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap, 2739 reiserfs_bmap_count(sb))) 2740 goto free_and_return; 2741 2742 allocate_bitmap_nodes(sb); 2743 2744 /* reserved for journal area support */ 2745 SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ? 2746 REISERFS_OLD_DISK_OFFSET_IN_BYTES 2747 / sb->s_blocksize + 2748 reiserfs_bmap_count(sb) + 2749 1 : 2750 REISERFS_DISK_OFFSET_IN_BYTES / 2751 sb->s_blocksize + 2); 2752 2753 /* 2754 * Sanity check to see is the standard journal fitting 2755 * within first bitmap (actual for small blocksizes) 2756 */ 2757 if (!SB_ONDISK_JOURNAL_DEVICE(sb) && 2758 (SB_JOURNAL_1st_RESERVED_BLOCK(sb) + 2759 SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) { 2760 reiserfs_warning(sb, "journal-1393", 2761 "journal does not fit for area addressed " 2762 "by first of bitmap blocks. It starts at " 2763 "%u and its size is %u. Block size %ld", 2764 SB_JOURNAL_1st_RESERVED_BLOCK(sb), 2765 SB_ONDISK_JOURNAL_SIZE(sb), 2766 sb->s_blocksize); 2767 goto free_and_return; 2768 } 2769 2770 /* 2771 * Sanity check to see if journal first block is correct. 2772 * If journal first block is invalid it can cause 2773 * zeroing important superblock members. 2774 */ 2775 if (!SB_ONDISK_JOURNAL_DEVICE(sb) && 2776 SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) { 2777 reiserfs_warning(sb, "journal-1393", 2778 "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d", 2779 SB_JOURNAL_1st_RESERVED_BLOCK(sb), 2780 SB_ONDISK_JOURNAL_1st_BLOCK(sb)); 2781 goto free_and_return; 2782 } 2783 2784 if (journal_init_dev(sb, journal, j_dev_name) != 0) { 2785 reiserfs_warning(sb, "sh-462", 2786 "unable to initialize journal device"); 2787 goto free_and_return; 2788 } 2789 2790 rs = SB_DISK_SUPER_BLOCK(sb); 2791 2792 /* read journal header */ 2793 bhjh = journal_bread(sb, 2794 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 2795 SB_ONDISK_JOURNAL_SIZE(sb)); 2796 if (!bhjh) { 2797 reiserfs_warning(sb, "sh-459", 2798 "unable to read journal header"); 2799 goto free_and_return; 2800 } 2801 jh = (struct reiserfs_journal_header *)(bhjh->b_data); 2802 2803 /* make sure that journal matches to the super block */ 2804 if (is_reiserfs_jr(rs) 2805 && (le32_to_cpu(jh->jh_journal.jp_journal_magic) != 2806 sb_jp_journal_magic(rs))) { 2807 reiserfs_warning(sb, "sh-460", 2808 "journal header magic %x (device %pg) does " 2809 "not match to magic found in super block %x", 2810 jh->jh_journal.jp_journal_magic, 2811 journal->j_dev_bd, 2812 sb_jp_journal_magic(rs)); 2813 brelse(bhjh); 2814 goto free_and_return; 2815 } 2816 2817 journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max); 2818 journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch); 2819 journal->j_max_commit_age = 2820 le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age); 2821 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; 2822 2823 if (check_advise_trans_params(sb, journal) != 0) 2824 goto free_and_return; 2825 journal->j_default_max_commit_age = journal->j_max_commit_age; 2826 2827 if (commit_max_age != 0) { 2828 journal->j_max_commit_age = commit_max_age; 2829 journal->j_max_trans_age = commit_max_age; 2830 } 2831 2832 reiserfs_info(sb, "journal params: device %pg, size %u, " 2833 "journal first block %u, max trans len %u, max batch %u, " 2834 "max commit age %u, max trans age %u\n", 2835 journal->j_dev_bd, 2836 SB_ONDISK_JOURNAL_SIZE(sb), 2837 SB_ONDISK_JOURNAL_1st_BLOCK(sb), 2838 journal->j_trans_max, 2839 journal->j_max_batch, 2840 journal->j_max_commit_age, journal->j_max_trans_age); 2841 2842 brelse(bhjh); 2843 2844 journal->j_list_bitmap_index = 0; 2845 journal_list_init(sb); 2846 2847 memset(journal->j_list_hash_table, 0, 2848 JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); 2849 2850 INIT_LIST_HEAD(&journal->j_dirty_buffers); 2851 spin_lock_init(&journal->j_dirty_buffers_lock); 2852 2853 journal->j_start = 0; 2854 journal->j_len = 0; 2855 journal->j_len_alloc = 0; 2856 atomic_set(&journal->j_wcount, 0); 2857 atomic_set(&journal->j_async_throttle, 0); 2858 journal->j_bcount = 0; 2859 journal->j_trans_start_time = 0; 2860 journal->j_last = NULL; 2861 journal->j_first = NULL; 2862 init_waitqueue_head(&journal->j_join_wait); 2863 mutex_init(&journal->j_mutex); 2864 mutex_init(&journal->j_flush_mutex); 2865 2866 journal->j_trans_id = 10; 2867 journal->j_mount_id = 10; 2868 journal->j_state = 0; 2869 atomic_set(&journal->j_jlock, 0); 2870 journal->j_cnode_free_list = allocate_cnodes(num_cnodes); 2871 journal->j_cnode_free_orig = journal->j_cnode_free_list; 2872 journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0; 2873 journal->j_cnode_used = 0; 2874 journal->j_must_wait = 0; 2875 2876 if (journal->j_cnode_free == 0) { 2877 reiserfs_warning(sb, "journal-2004", "Journal cnode memory " 2878 "allocation failed (%ld bytes). Journal is " 2879 "too large for available memory. Usually " 2880 "this is due to a journal that is too large.", 2881 sizeof (struct reiserfs_journal_cnode) * num_cnodes); 2882 goto free_and_return; 2883 } 2884 2885 init_journal_hash(sb); 2886 jl = journal->j_current_jl; 2887 2888 /* 2889 * get_list_bitmap() may call flush_commit_list() which 2890 * requires the lock. Calling flush_commit_list() shouldn't happen 2891 * this early but I like to be paranoid. 2892 */ 2893 reiserfs_write_lock(sb); 2894 jl->j_list_bitmap = get_list_bitmap(sb, jl); 2895 reiserfs_write_unlock(sb); 2896 if (!jl->j_list_bitmap) { 2897 reiserfs_warning(sb, "journal-2005", 2898 "get_list_bitmap failed for journal list 0"); 2899 goto free_and_return; 2900 } 2901 2902 ret = journal_read(sb); 2903 if (ret < 0) { 2904 reiserfs_warning(sb, "reiserfs-2006", 2905 "Replay Failure, unable to mount"); 2906 goto free_and_return; 2907 } 2908 2909 INIT_DELAYED_WORK(&journal->j_work, flush_async_commits); 2910 journal->j_work_sb = sb; 2911 return 0; 2912 free_and_return: 2913 free_journal_ram(sb); 2914 return 1; 2915 } 2916 2917 /* 2918 * test for a polite end of the current transaction. Used by file_write, 2919 * and should be used by delete to make sure they don't write more than 2920 * can fit inside a single transaction 2921 */ 2922 int journal_transaction_should_end(struct reiserfs_transaction_handle *th, 2923 int new_alloc) 2924 { 2925 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); 2926 time64_t now = ktime_get_seconds(); 2927 /* cannot restart while nested */ 2928 BUG_ON(!th->t_trans_id); 2929 if (th->t_refcount > 1) 2930 return 0; 2931 if (journal->j_must_wait > 0 || 2932 (journal->j_len_alloc + new_alloc) >= journal->j_max_batch || 2933 atomic_read(&journal->j_jlock) || 2934 (now - journal->j_trans_start_time) > journal->j_max_trans_age || 2935 journal->j_cnode_free < (journal->j_trans_max * 3)) { 2936 return 1; 2937 } 2938 2939 journal->j_len_alloc += new_alloc; 2940 th->t_blocks_allocated += new_alloc ; 2941 return 0; 2942 } 2943 2944 /* this must be called inside a transaction */ 2945 void reiserfs_block_writes(struct reiserfs_transaction_handle *th) 2946 { 2947 struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); 2948 BUG_ON(!th->t_trans_id); 2949 journal->j_must_wait = 1; 2950 set_bit(J_WRITERS_BLOCKED, &journal->j_state); 2951 return; 2952 } 2953 2954 /* this must be called without a transaction started */ 2955 void reiserfs_allow_writes(struct super_block *s) 2956 { 2957 struct reiserfs_journal *journal = SB_JOURNAL(s); 2958 clear_bit(J_WRITERS_BLOCKED, &journal->j_state); 2959 wake_up(&journal->j_join_wait); 2960 } 2961 2962 /* this must be called without a transaction started */ 2963 void reiserfs_wait_on_write_block(struct super_block *s) 2964 { 2965 struct reiserfs_journal *journal = SB_JOURNAL(s); 2966 wait_event(journal->j_join_wait, 2967 !test_bit(J_WRITERS_BLOCKED, &journal->j_state)); 2968 } 2969 2970 static void queue_log_writer(struct super_block *s) 2971 { 2972 wait_queue_entry_t wait; 2973 struct reiserfs_journal *journal = SB_JOURNAL(s); 2974 set_bit(J_WRITERS_QUEUED, &journal->j_state); 2975 2976 /* 2977 * we don't want to use wait_event here because 2978 * we only want to wait once. 2979 */ 2980 init_waitqueue_entry(&wait, current); 2981 add_wait_queue(&journal->j_join_wait, &wait); 2982 set_current_state(TASK_UNINTERRUPTIBLE); 2983 if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) { 2984 int depth = reiserfs_write_unlock_nested(s); 2985 schedule(); 2986 reiserfs_write_lock_nested(s, depth); 2987 } 2988 __set_current_state(TASK_RUNNING); 2989 remove_wait_queue(&journal->j_join_wait, &wait); 2990 } 2991 2992 static void wake_queued_writers(struct super_block *s) 2993 { 2994 struct reiserfs_journal *journal = SB_JOURNAL(s); 2995 if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state)) 2996 wake_up(&journal->j_join_wait); 2997 } 2998 2999 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id) 3000 { 3001 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3002 unsigned long bcount = journal->j_bcount; 3003 while (1) { 3004 int depth; 3005 3006 depth = reiserfs_write_unlock_nested(sb); 3007 schedule_timeout_uninterruptible(1); 3008 reiserfs_write_lock_nested(sb, depth); 3009 3010 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING; 3011 while ((atomic_read(&journal->j_wcount) > 0 || 3012 atomic_read(&journal->j_jlock)) && 3013 journal->j_trans_id == trans_id) { 3014 queue_log_writer(sb); 3015 } 3016 if (journal->j_trans_id != trans_id) 3017 break; 3018 if (bcount == journal->j_bcount) 3019 break; 3020 bcount = journal->j_bcount; 3021 } 3022 } 3023 3024 /* 3025 * join == true if you must join an existing transaction. 3026 * join == false if you can deal with waiting for others to finish 3027 * 3028 * this will block until the transaction is joinable. send the number of 3029 * blocks you expect to use in nblocks. 3030 */ 3031 static int do_journal_begin_r(struct reiserfs_transaction_handle *th, 3032 struct super_block *sb, unsigned long nblocks, 3033 int join) 3034 { 3035 time64_t now = ktime_get_seconds(); 3036 unsigned int old_trans_id; 3037 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3038 struct reiserfs_transaction_handle myth; 3039 int retval; 3040 int depth; 3041 3042 reiserfs_check_lock_depth(sb, "journal_begin"); 3043 BUG_ON(nblocks > journal->j_trans_max); 3044 3045 PROC_INFO_INC(sb, journal.journal_being); 3046 /* set here for journal_join */ 3047 th->t_refcount = 1; 3048 th->t_super = sb; 3049 3050 relock: 3051 lock_journal(sb); 3052 if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) { 3053 unlock_journal(sb); 3054 retval = journal->j_errno; 3055 goto out_fail; 3056 } 3057 journal->j_bcount++; 3058 3059 if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) { 3060 unlock_journal(sb); 3061 depth = reiserfs_write_unlock_nested(sb); 3062 reiserfs_wait_on_write_block(sb); 3063 reiserfs_write_lock_nested(sb, depth); 3064 PROC_INFO_INC(sb, journal.journal_relock_writers); 3065 goto relock; 3066 } 3067 now = ktime_get_seconds(); 3068 3069 /* 3070 * if there is no room in the journal OR 3071 * if this transaction is too old, and we weren't called joinable, 3072 * wait for it to finish before beginning we don't sleep if there 3073 * aren't other writers 3074 */ 3075 3076 if ((!join && journal->j_must_wait > 0) || 3077 (!join 3078 && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch) 3079 || (!join && atomic_read(&journal->j_wcount) > 0 3080 && journal->j_trans_start_time > 0 3081 && (now - journal->j_trans_start_time) > 3082 journal->j_max_trans_age) || (!join 3083 && atomic_read(&journal->j_jlock)) 3084 || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) { 3085 3086 old_trans_id = journal->j_trans_id; 3087 /* allow others to finish this transaction */ 3088 unlock_journal(sb); 3089 3090 if (!join && (journal->j_len_alloc + nblocks + 2) >= 3091 journal->j_max_batch && 3092 ((journal->j_len + nblocks + 2) * 100) < 3093 (journal->j_len_alloc * 75)) { 3094 if (atomic_read(&journal->j_wcount) > 10) { 3095 queue_log_writer(sb); 3096 goto relock; 3097 } 3098 } 3099 /* 3100 * don't mess with joining the transaction if all we 3101 * have to do is wait for someone else to do a commit 3102 */ 3103 if (atomic_read(&journal->j_jlock)) { 3104 while (journal->j_trans_id == old_trans_id && 3105 atomic_read(&journal->j_jlock)) { 3106 queue_log_writer(sb); 3107 } 3108 goto relock; 3109 } 3110 retval = journal_join(&myth, sb); 3111 if (retval) 3112 goto out_fail; 3113 3114 /* someone might have ended the transaction while we joined */ 3115 if (old_trans_id != journal->j_trans_id) { 3116 retval = do_journal_end(&myth, 0); 3117 } else { 3118 retval = do_journal_end(&myth, COMMIT_NOW); 3119 } 3120 3121 if (retval) 3122 goto out_fail; 3123 3124 PROC_INFO_INC(sb, journal.journal_relock_wcount); 3125 goto relock; 3126 } 3127 /* we are the first writer, set trans_id */ 3128 if (journal->j_trans_start_time == 0) { 3129 journal->j_trans_start_time = ktime_get_seconds(); 3130 } 3131 atomic_inc(&journal->j_wcount); 3132 journal->j_len_alloc += nblocks; 3133 th->t_blocks_logged = 0; 3134 th->t_blocks_allocated = nblocks; 3135 th->t_trans_id = journal->j_trans_id; 3136 unlock_journal(sb); 3137 INIT_LIST_HEAD(&th->t_list); 3138 return 0; 3139 3140 out_fail: 3141 memset(th, 0, sizeof(*th)); 3142 /* 3143 * Re-set th->t_super, so we can properly keep track of how many 3144 * persistent transactions there are. We need to do this so if this 3145 * call is part of a failed restart_transaction, we can free it later 3146 */ 3147 th->t_super = sb; 3148 return retval; 3149 } 3150 3151 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct 3152 super_block 3153 *s, 3154 int nblocks) 3155 { 3156 int ret; 3157 struct reiserfs_transaction_handle *th; 3158 3159 /* 3160 * if we're nesting into an existing transaction. It will be 3161 * persistent on its own 3162 */ 3163 if (reiserfs_transaction_running(s)) { 3164 th = current->journal_info; 3165 th->t_refcount++; 3166 BUG_ON(th->t_refcount < 2); 3167 3168 return th; 3169 } 3170 th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS); 3171 if (!th) 3172 return NULL; 3173 ret = journal_begin(th, s, nblocks); 3174 if (ret) { 3175 kfree(th); 3176 return NULL; 3177 } 3178 3179 SB_JOURNAL(s)->j_persistent_trans++; 3180 return th; 3181 } 3182 3183 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th) 3184 { 3185 struct super_block *s = th->t_super; 3186 int ret = 0; 3187 if (th->t_trans_id) 3188 ret = journal_end(th); 3189 else 3190 ret = -EIO; 3191 if (th->t_refcount == 0) { 3192 SB_JOURNAL(s)->j_persistent_trans--; 3193 kfree(th); 3194 } 3195 return ret; 3196 } 3197 3198 static int journal_join(struct reiserfs_transaction_handle *th, 3199 struct super_block *sb) 3200 { 3201 struct reiserfs_transaction_handle *cur_th = current->journal_info; 3202 3203 /* 3204 * this keeps do_journal_end from NULLing out the 3205 * current->journal_info pointer 3206 */ 3207 th->t_handle_save = cur_th; 3208 BUG_ON(cur_th && cur_th->t_refcount > 1); 3209 return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN); 3210 } 3211 3212 int journal_join_abort(struct reiserfs_transaction_handle *th, 3213 struct super_block *sb) 3214 { 3215 struct reiserfs_transaction_handle *cur_th = current->journal_info; 3216 3217 /* 3218 * this keeps do_journal_end from NULLing out the 3219 * current->journal_info pointer 3220 */ 3221 th->t_handle_save = cur_th; 3222 BUG_ON(cur_th && cur_th->t_refcount > 1); 3223 return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT); 3224 } 3225 3226 int journal_begin(struct reiserfs_transaction_handle *th, 3227 struct super_block *sb, unsigned long nblocks) 3228 { 3229 struct reiserfs_transaction_handle *cur_th = current->journal_info; 3230 int ret; 3231 3232 th->t_handle_save = NULL; 3233 if (cur_th) { 3234 /* we are nesting into the current transaction */ 3235 if (cur_th->t_super == sb) { 3236 BUG_ON(!cur_th->t_refcount); 3237 cur_th->t_refcount++; 3238 memcpy(th, cur_th, sizeof(*th)); 3239 if (th->t_refcount <= 1) 3240 reiserfs_warning(sb, "reiserfs-2005", 3241 "BAD: refcount <= 1, but " 3242 "journal_info != 0"); 3243 return 0; 3244 } else { 3245 /* 3246 * we've ended up with a handle from a different 3247 * filesystem. save it and restore on journal_end. 3248 * This should never really happen... 3249 */ 3250 reiserfs_warning(sb, "clm-2100", 3251 "nesting info a different FS"); 3252 th->t_handle_save = current->journal_info; 3253 current->journal_info = th; 3254 } 3255 } else { 3256 current->journal_info = th; 3257 } 3258 ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG); 3259 BUG_ON(current->journal_info != th); 3260 3261 /* 3262 * I guess this boils down to being the reciprocal of clm-2100 above. 3263 * If do_journal_begin_r fails, we need to put it back, since 3264 * journal_end won't be called to do it. */ 3265 if (ret) 3266 current->journal_info = th->t_handle_save; 3267 else 3268 BUG_ON(!th->t_refcount); 3269 3270 return ret; 3271 } 3272 3273 /* 3274 * puts bh into the current transaction. If it was already there, reorders 3275 * removes the old pointers from the hash, and puts new ones in (to make 3276 * sure replay happen in the right order). 3277 * 3278 * if it was dirty, cleans and files onto the clean list. I can't let it 3279 * be dirty again until the transaction is committed. 3280 * 3281 * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. 3282 */ 3283 int journal_mark_dirty(struct reiserfs_transaction_handle *th, 3284 struct buffer_head *bh) 3285 { 3286 struct super_block *sb = th->t_super; 3287 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3288 struct reiserfs_journal_cnode *cn = NULL; 3289 int count_already_incd = 0; 3290 int prepared = 0; 3291 BUG_ON(!th->t_trans_id); 3292 3293 PROC_INFO_INC(sb, journal.mark_dirty); 3294 if (th->t_trans_id != journal->j_trans_id) { 3295 reiserfs_panic(th->t_super, "journal-1577", 3296 "handle trans id %ld != current trans id %ld", 3297 th->t_trans_id, journal->j_trans_id); 3298 } 3299 3300 prepared = test_clear_buffer_journal_prepared(bh); 3301 clear_buffer_journal_restore_dirty(bh); 3302 /* already in this transaction, we are done */ 3303 if (buffer_journaled(bh)) { 3304 PROC_INFO_INC(sb, journal.mark_dirty_already); 3305 return 0; 3306 } 3307 3308 /* 3309 * this must be turned into a panic instead of a warning. We can't 3310 * allow a dirty or journal_dirty or locked buffer to be logged, as 3311 * some changes could get to disk too early. NOT GOOD. 3312 */ 3313 if (!prepared || buffer_dirty(bh)) { 3314 reiserfs_warning(sb, "journal-1777", 3315 "buffer %llu bad state " 3316 "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT", 3317 (unsigned long long)bh->b_blocknr, 3318 prepared ? ' ' : '!', 3319 buffer_locked(bh) ? ' ' : '!', 3320 buffer_dirty(bh) ? ' ' : '!', 3321 buffer_journal_dirty(bh) ? ' ' : '!'); 3322 } 3323 3324 if (atomic_read(&journal->j_wcount) <= 0) { 3325 reiserfs_warning(sb, "journal-1409", 3326 "returning because j_wcount was %d", 3327 atomic_read(&journal->j_wcount)); 3328 return 1; 3329 } 3330 /* 3331 * this error means I've screwed up, and we've overflowed 3332 * the transaction. Nothing can be done here, except make the 3333 * FS readonly or panic. 3334 */ 3335 if (journal->j_len >= journal->j_trans_max) { 3336 reiserfs_panic(th->t_super, "journal-1413", 3337 "j_len (%lu) is too big", 3338 journal->j_len); 3339 } 3340 3341 if (buffer_journal_dirty(bh)) { 3342 count_already_incd = 1; 3343 PROC_INFO_INC(sb, journal.mark_dirty_notjournal); 3344 clear_buffer_journal_dirty(bh); 3345 } 3346 3347 if (journal->j_len > journal->j_len_alloc) { 3348 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT; 3349 } 3350 3351 set_buffer_journaled(bh); 3352 3353 /* now put this guy on the end */ 3354 if (!cn) { 3355 cn = get_cnode(sb); 3356 if (!cn) { 3357 reiserfs_panic(sb, "journal-4", "get_cnode failed!"); 3358 } 3359 3360 if (th->t_blocks_logged == th->t_blocks_allocated) { 3361 th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT; 3362 journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT; 3363 } 3364 th->t_blocks_logged++; 3365 journal->j_len++; 3366 3367 cn->bh = bh; 3368 cn->blocknr = bh->b_blocknr; 3369 cn->sb = sb; 3370 cn->jlist = NULL; 3371 insert_journal_hash(journal->j_hash_table, cn); 3372 if (!count_already_incd) { 3373 get_bh(bh); 3374 } 3375 } 3376 cn->next = NULL; 3377 cn->prev = journal->j_last; 3378 cn->bh = bh; 3379 if (journal->j_last) { 3380 journal->j_last->next = cn; 3381 journal->j_last = cn; 3382 } else { 3383 journal->j_first = cn; 3384 journal->j_last = cn; 3385 } 3386 reiserfs_schedule_old_flush(sb); 3387 return 0; 3388 } 3389 3390 int journal_end(struct reiserfs_transaction_handle *th) 3391 { 3392 struct super_block *sb = th->t_super; 3393 if (!current->journal_info && th->t_refcount > 1) 3394 reiserfs_warning(sb, "REISER-NESTING", 3395 "th NULL, refcount %d", th->t_refcount); 3396 3397 if (!th->t_trans_id) { 3398 WARN_ON(1); 3399 return -EIO; 3400 } 3401 3402 th->t_refcount--; 3403 if (th->t_refcount > 0) { 3404 struct reiserfs_transaction_handle *cur_th = 3405 current->journal_info; 3406 3407 /* 3408 * we aren't allowed to close a nested transaction on a 3409 * different filesystem from the one in the task struct 3410 */ 3411 BUG_ON(cur_th->t_super != th->t_super); 3412 3413 if (th != cur_th) { 3414 memcpy(current->journal_info, th, sizeof(*th)); 3415 th->t_trans_id = 0; 3416 } 3417 return 0; 3418 } else { 3419 return do_journal_end(th, 0); 3420 } 3421 } 3422 3423 /* 3424 * removes from the current transaction, relsing and descrementing any counters. 3425 * also files the removed buffer directly onto the clean list 3426 * 3427 * called by journal_mark_freed when a block has been deleted 3428 * 3429 * returns 1 if it cleaned and relsed the buffer. 0 otherwise 3430 */ 3431 static int remove_from_transaction(struct super_block *sb, 3432 b_blocknr_t blocknr, int already_cleaned) 3433 { 3434 struct buffer_head *bh; 3435 struct reiserfs_journal_cnode *cn; 3436 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3437 int ret = 0; 3438 3439 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); 3440 if (!cn || !cn->bh) { 3441 return ret; 3442 } 3443 bh = cn->bh; 3444 if (cn->prev) { 3445 cn->prev->next = cn->next; 3446 } 3447 if (cn->next) { 3448 cn->next->prev = cn->prev; 3449 } 3450 if (cn == journal->j_first) { 3451 journal->j_first = cn->next; 3452 } 3453 if (cn == journal->j_last) { 3454 journal->j_last = cn->prev; 3455 } 3456 remove_journal_hash(sb, journal->j_hash_table, NULL, 3457 bh->b_blocknr, 0); 3458 clear_buffer_journaled(bh); /* don't log this one */ 3459 3460 if (!already_cleaned) { 3461 clear_buffer_journal_dirty(bh); 3462 clear_buffer_dirty(bh); 3463 clear_buffer_journal_test(bh); 3464 put_bh(bh); 3465 if (atomic_read(&bh->b_count) < 0) { 3466 reiserfs_warning(sb, "journal-1752", 3467 "b_count < 0"); 3468 } 3469 ret = 1; 3470 } 3471 journal->j_len--; 3472 journal->j_len_alloc--; 3473 free_cnode(sb, cn); 3474 return ret; 3475 } 3476 3477 /* 3478 * for any cnode in a journal list, it can only be dirtied of all the 3479 * transactions that include it are committed to disk. 3480 * this checks through each transaction, and returns 1 if you are allowed 3481 * to dirty, and 0 if you aren't 3482 * 3483 * it is called by dirty_journal_list, which is called after 3484 * flush_commit_list has gotten all the log blocks for a given 3485 * transaction on disk 3486 * 3487 */ 3488 static int can_dirty(struct reiserfs_journal_cnode *cn) 3489 { 3490 struct super_block *sb = cn->sb; 3491 b_blocknr_t blocknr = cn->blocknr; 3492 struct reiserfs_journal_cnode *cur = cn->hprev; 3493 int can_dirty = 1; 3494 3495 /* 3496 * first test hprev. These are all newer than cn, so any node here 3497 * with the same block number and dev means this node can't be sent 3498 * to disk right now. 3499 */ 3500 while (cur && can_dirty) { 3501 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb && 3502 cur->blocknr == blocknr) { 3503 can_dirty = 0; 3504 } 3505 cur = cur->hprev; 3506 } 3507 /* 3508 * then test hnext. These are all older than cn. As long as they 3509 * are committed to the log, it is safe to write cn to disk 3510 */ 3511 cur = cn->hnext; 3512 while (cur && can_dirty) { 3513 if (cur->jlist && cur->jlist->j_len > 0 && 3514 atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh && 3515 cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) { 3516 can_dirty = 0; 3517 } 3518 cur = cur->hnext; 3519 } 3520 return can_dirty; 3521 } 3522 3523 /* 3524 * syncs the commit blocks, but does not force the real buffers to disk 3525 * will wait until the current transaction is done/committed before returning 3526 */ 3527 int journal_end_sync(struct reiserfs_transaction_handle *th) 3528 { 3529 struct super_block *sb = th->t_super; 3530 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3531 3532 BUG_ON(!th->t_trans_id); 3533 /* you can sync while nested, very, very bad */ 3534 BUG_ON(th->t_refcount > 1); 3535 if (journal->j_len == 0) { 3536 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 3537 1); 3538 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb)); 3539 } 3540 return do_journal_end(th, COMMIT_NOW | WAIT); 3541 } 3542 3543 /* writeback the pending async commits to disk */ 3544 static void flush_async_commits(struct work_struct *work) 3545 { 3546 struct reiserfs_journal *journal = 3547 container_of(work, struct reiserfs_journal, j_work.work); 3548 struct super_block *sb = journal->j_work_sb; 3549 struct reiserfs_journal_list *jl; 3550 struct list_head *entry; 3551 3552 reiserfs_write_lock(sb); 3553 if (!list_empty(&journal->j_journal_list)) { 3554 /* last entry is the youngest, commit it and you get everything */ 3555 entry = journal->j_journal_list.prev; 3556 jl = JOURNAL_LIST_ENTRY(entry); 3557 flush_commit_list(sb, jl, 1); 3558 } 3559 reiserfs_write_unlock(sb); 3560 } 3561 3562 /* 3563 * flushes any old transactions to disk 3564 * ends the current transaction if it is too old 3565 */ 3566 void reiserfs_flush_old_commits(struct super_block *sb) 3567 { 3568 time64_t now; 3569 struct reiserfs_transaction_handle th; 3570 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3571 3572 now = ktime_get_seconds(); 3573 /* 3574 * safety check so we don't flush while we are replaying the log during 3575 * mount 3576 */ 3577 if (list_empty(&journal->j_journal_list)) 3578 return; 3579 3580 /* 3581 * check the current transaction. If there are no writers, and it is 3582 * too old, finish it, and force the commit blocks to disk 3583 */ 3584 if (atomic_read(&journal->j_wcount) <= 0 && 3585 journal->j_trans_start_time > 0 && 3586 journal->j_len > 0 && 3587 (now - journal->j_trans_start_time) > journal->j_max_trans_age) { 3588 if (!journal_join(&th, sb)) { 3589 reiserfs_prepare_for_journal(sb, 3590 SB_BUFFER_WITH_SB(sb), 3591 1); 3592 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb)); 3593 3594 /* 3595 * we're only being called from kreiserfsd, it makes 3596 * no sense to do an async commit so that kreiserfsd 3597 * can do it later 3598 */ 3599 do_journal_end(&th, COMMIT_NOW | WAIT); 3600 } 3601 } 3602 } 3603 3604 /* 3605 * returns 0 if do_journal_end should return right away, returns 1 if 3606 * do_journal_end should finish the commit 3607 * 3608 * if the current transaction is too old, but still has writers, this will 3609 * wait on j_join_wait until all the writers are done. By the time it 3610 * wakes up, the transaction it was called has already ended, so it just 3611 * flushes the commit list and returns 0. 3612 * 3613 * Won't batch when flush or commit_now is set. Also won't batch when 3614 * others are waiting on j_join_wait. 3615 * 3616 * Note, we can't allow the journal_end to proceed while there are still 3617 * writers in the log. 3618 */ 3619 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags) 3620 { 3621 3622 time64_t now; 3623 int flush = flags & FLUSH_ALL; 3624 int commit_now = flags & COMMIT_NOW; 3625 int wait_on_commit = flags & WAIT; 3626 struct reiserfs_journal_list *jl; 3627 struct super_block *sb = th->t_super; 3628 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3629 3630 BUG_ON(!th->t_trans_id); 3631 3632 if (th->t_trans_id != journal->j_trans_id) { 3633 reiserfs_panic(th->t_super, "journal-1577", 3634 "handle trans id %ld != current trans id %ld", 3635 th->t_trans_id, journal->j_trans_id); 3636 } 3637 3638 journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged); 3639 /* <= 0 is allowed. unmounting might not call begin */ 3640 if (atomic_read(&journal->j_wcount) > 0) 3641 atomic_dec(&journal->j_wcount); 3642 3643 /* 3644 * BUG, deal with case where j_len is 0, but people previously 3645 * freed blocks need to be released will be dealt with by next 3646 * transaction that actually writes something, but should be taken 3647 * care of in this trans 3648 */ 3649 BUG_ON(journal->j_len == 0); 3650 3651 /* 3652 * if wcount > 0, and we are called to with flush or commit_now, 3653 * we wait on j_join_wait. We will wake up when the last writer has 3654 * finished the transaction, and started it on its way to the disk. 3655 * Then, we flush the commit or journal list, and just return 0 3656 * because the rest of journal end was already done for this 3657 * transaction. 3658 */ 3659 if (atomic_read(&journal->j_wcount) > 0) { 3660 if (flush || commit_now) { 3661 unsigned trans_id; 3662 3663 jl = journal->j_current_jl; 3664 trans_id = jl->j_trans_id; 3665 if (wait_on_commit) 3666 jl->j_state |= LIST_COMMIT_PENDING; 3667 atomic_set(&journal->j_jlock, 1); 3668 if (flush) { 3669 journal->j_next_full_flush = 1; 3670 } 3671 unlock_journal(sb); 3672 3673 /* 3674 * sleep while the current transaction is 3675 * still j_jlocked 3676 */ 3677 while (journal->j_trans_id == trans_id) { 3678 if (atomic_read(&journal->j_jlock)) { 3679 queue_log_writer(sb); 3680 } else { 3681 lock_journal(sb); 3682 if (journal->j_trans_id == trans_id) { 3683 atomic_set(&journal->j_jlock, 3684 1); 3685 } 3686 unlock_journal(sb); 3687 } 3688 } 3689 BUG_ON(journal->j_trans_id == trans_id); 3690 3691 if (commit_now 3692 && journal_list_still_alive(sb, trans_id) 3693 && wait_on_commit) { 3694 flush_commit_list(sb, jl, 1); 3695 } 3696 return 0; 3697 } 3698 unlock_journal(sb); 3699 return 0; 3700 } 3701 3702 /* deal with old transactions where we are the last writers */ 3703 now = ktime_get_seconds(); 3704 if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) { 3705 commit_now = 1; 3706 journal->j_next_async_flush = 1; 3707 } 3708 /* don't batch when someone is waiting on j_join_wait */ 3709 /* don't batch when syncing the commit or flushing the whole trans */ 3710 if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock)) 3711 && !flush && !commit_now && (journal->j_len < journal->j_max_batch) 3712 && journal->j_len_alloc < journal->j_max_batch 3713 && journal->j_cnode_free > (journal->j_trans_max * 3)) { 3714 journal->j_bcount++; 3715 unlock_journal(sb); 3716 return 0; 3717 } 3718 3719 if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) { 3720 reiserfs_panic(sb, "journal-003", 3721 "j_start (%ld) is too high", 3722 journal->j_start); 3723 } 3724 return 1; 3725 } 3726 3727 /* 3728 * Does all the work that makes deleting blocks safe. 3729 * when deleting a block mark BH_JNew, just remove it from the current 3730 * transaction, clean it's buffer_head and move on. 3731 * 3732 * otherwise: 3733 * set a bit for the block in the journal bitmap. That will prevent it from 3734 * being allocated for unformatted nodes before this transaction has finished. 3735 * 3736 * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. 3737 * That will prevent any old transactions with this block from trying to flush 3738 * to the real location. Since we aren't removing the cnode from the 3739 * journal_list_hash, *the block can't be reallocated yet. 3740 * 3741 * Then remove it from the current transaction, decrementing any counters and 3742 * filing it on the clean list. 3743 */ 3744 int journal_mark_freed(struct reiserfs_transaction_handle *th, 3745 struct super_block *sb, b_blocknr_t blocknr) 3746 { 3747 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3748 struct reiserfs_journal_cnode *cn = NULL; 3749 struct buffer_head *bh = NULL; 3750 struct reiserfs_list_bitmap *jb = NULL; 3751 int cleaned = 0; 3752 BUG_ON(!th->t_trans_id); 3753 3754 cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); 3755 if (cn && cn->bh) { 3756 bh = cn->bh; 3757 get_bh(bh); 3758 } 3759 /* if it is journal new, we just remove it from this transaction */ 3760 if (bh && buffer_journal_new(bh)) { 3761 clear_buffer_journal_new(bh); 3762 clear_prepared_bits(bh); 3763 reiserfs_clean_and_file_buffer(bh); 3764 cleaned = remove_from_transaction(sb, blocknr, cleaned); 3765 } else { 3766 /* 3767 * set the bit for this block in the journal bitmap 3768 * for this transaction 3769 */ 3770 jb = journal->j_current_jl->j_list_bitmap; 3771 if (!jb) { 3772 reiserfs_panic(sb, "journal-1702", 3773 "journal_list_bitmap is NULL"); 3774 } 3775 set_bit_in_list_bitmap(sb, blocknr, jb); 3776 3777 /* Note, the entire while loop is not allowed to schedule. */ 3778 3779 if (bh) { 3780 clear_prepared_bits(bh); 3781 reiserfs_clean_and_file_buffer(bh); 3782 } 3783 cleaned = remove_from_transaction(sb, blocknr, cleaned); 3784 3785 /* 3786 * find all older transactions with this block, 3787 * make sure they don't try to write it out 3788 */ 3789 cn = get_journal_hash_dev(sb, journal->j_list_hash_table, 3790 blocknr); 3791 while (cn) { 3792 if (sb == cn->sb && blocknr == cn->blocknr) { 3793 set_bit(BLOCK_FREED, &cn->state); 3794 if (cn->bh) { 3795 /* 3796 * remove_from_transaction will brelse 3797 * the buffer if it was in the current 3798 * trans 3799 */ 3800 if (!cleaned) { 3801 clear_buffer_journal_dirty(cn-> 3802 bh); 3803 clear_buffer_dirty(cn->bh); 3804 clear_buffer_journal_test(cn-> 3805 bh); 3806 cleaned = 1; 3807 put_bh(cn->bh); 3808 if (atomic_read 3809 (&cn->bh->b_count) < 0) { 3810 reiserfs_warning(sb, 3811 "journal-2138", 3812 "cn->bh->b_count < 0"); 3813 } 3814 } 3815 /* 3816 * since we are clearing the bh, 3817 * we MUST dec nonzerolen 3818 */ 3819 if (cn->jlist) { 3820 atomic_dec(&cn->jlist-> 3821 j_nonzerolen); 3822 } 3823 cn->bh = NULL; 3824 } 3825 } 3826 cn = cn->hnext; 3827 } 3828 } 3829 3830 if (bh) 3831 release_buffer_page(bh); /* get_hash grabs the buffer */ 3832 return 0; 3833 } 3834 3835 void reiserfs_update_inode_transaction(struct inode *inode) 3836 { 3837 struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb); 3838 REISERFS_I(inode)->i_jl = journal->j_current_jl; 3839 REISERFS_I(inode)->i_trans_id = journal->j_trans_id; 3840 } 3841 3842 /* 3843 * returns -1 on error, 0 if no commits/barriers were done and 1 3844 * if a transaction was actually committed and the barrier was done 3845 */ 3846 static int __commit_trans_jl(struct inode *inode, unsigned long id, 3847 struct reiserfs_journal_list *jl) 3848 { 3849 struct reiserfs_transaction_handle th; 3850 struct super_block *sb = inode->i_sb; 3851 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3852 int ret = 0; 3853 3854 /* 3855 * is it from the current transaction, 3856 * or from an unknown transaction? 3857 */ 3858 if (id == journal->j_trans_id) { 3859 jl = journal->j_current_jl; 3860 /* 3861 * try to let other writers come in and 3862 * grow this transaction 3863 */ 3864 let_transaction_grow(sb, id); 3865 if (journal->j_trans_id != id) { 3866 goto flush_commit_only; 3867 } 3868 3869 ret = journal_begin(&th, sb, 1); 3870 if (ret) 3871 return ret; 3872 3873 /* someone might have ended this transaction while we joined */ 3874 if (journal->j_trans_id != id) { 3875 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 3876 1); 3877 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb)); 3878 ret = journal_end(&th); 3879 goto flush_commit_only; 3880 } 3881 3882 ret = journal_end_sync(&th); 3883 if (!ret) 3884 ret = 1; 3885 3886 } else { 3887 /* 3888 * this gets tricky, we have to make sure the journal list in 3889 * the inode still exists. We know the list is still around 3890 * if we've got a larger transaction id than the oldest list 3891 */ 3892 flush_commit_only: 3893 if (journal_list_still_alive(inode->i_sb, id)) { 3894 /* 3895 * we only set ret to 1 when we know for sure 3896 * the barrier hasn't been started yet on the commit 3897 * block. 3898 */ 3899 if (atomic_read(&jl->j_commit_left) > 1) 3900 ret = 1; 3901 flush_commit_list(sb, jl, 1); 3902 if (journal->j_errno) 3903 ret = journal->j_errno; 3904 } 3905 } 3906 /* otherwise the list is gone, and long since committed */ 3907 return ret; 3908 } 3909 3910 int reiserfs_commit_for_inode(struct inode *inode) 3911 { 3912 unsigned int id = REISERFS_I(inode)->i_trans_id; 3913 struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl; 3914 3915 /* 3916 * for the whole inode, assume unset id means it was 3917 * changed in the current transaction. More conservative 3918 */ 3919 if (!id || !jl) { 3920 reiserfs_update_inode_transaction(inode); 3921 id = REISERFS_I(inode)->i_trans_id; 3922 /* jl will be updated in __commit_trans_jl */ 3923 } 3924 3925 return __commit_trans_jl(inode, id, jl); 3926 } 3927 3928 void reiserfs_restore_prepared_buffer(struct super_block *sb, 3929 struct buffer_head *bh) 3930 { 3931 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3932 PROC_INFO_INC(sb, journal.restore_prepared); 3933 if (!bh) { 3934 return; 3935 } 3936 if (test_clear_buffer_journal_restore_dirty(bh) && 3937 buffer_journal_dirty(bh)) { 3938 struct reiserfs_journal_cnode *cn; 3939 reiserfs_write_lock(sb); 3940 cn = get_journal_hash_dev(sb, 3941 journal->j_list_hash_table, 3942 bh->b_blocknr); 3943 if (cn && can_dirty(cn)) { 3944 set_buffer_journal_test(bh); 3945 mark_buffer_dirty(bh); 3946 } 3947 reiserfs_write_unlock(sb); 3948 } 3949 clear_buffer_journal_prepared(bh); 3950 } 3951 3952 extern struct tree_balance *cur_tb; 3953 /* 3954 * before we can change a metadata block, we have to make sure it won't 3955 * be written to disk while we are altering it. So, we must: 3956 * clean it 3957 * wait on it. 3958 */ 3959 int reiserfs_prepare_for_journal(struct super_block *sb, 3960 struct buffer_head *bh, int wait) 3961 { 3962 PROC_INFO_INC(sb, journal.prepare); 3963 3964 if (!trylock_buffer(bh)) { 3965 if (!wait) 3966 return 0; 3967 lock_buffer(bh); 3968 } 3969 set_buffer_journal_prepared(bh); 3970 if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) { 3971 clear_buffer_journal_test(bh); 3972 set_buffer_journal_restore_dirty(bh); 3973 } 3974 unlock_buffer(bh); 3975 return 1; 3976 } 3977 3978 /* 3979 * long and ugly. If flush, will not return until all commit 3980 * blocks and all real buffers in the trans are on disk. 3981 * If no_async, won't return until all commit blocks are on disk. 3982 * 3983 * keep reading, there are comments as you go along 3984 * 3985 * If the journal is aborted, we just clean up. Things like flushing 3986 * journal lists, etc just won't happen. 3987 */ 3988 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags) 3989 { 3990 struct super_block *sb = th->t_super; 3991 struct reiserfs_journal *journal = SB_JOURNAL(sb); 3992 struct reiserfs_journal_cnode *cn, *next, *jl_cn; 3993 struct reiserfs_journal_cnode *last_cn = NULL; 3994 struct reiserfs_journal_desc *desc; 3995 struct reiserfs_journal_commit *commit; 3996 struct buffer_head *c_bh; /* commit bh */ 3997 struct buffer_head *d_bh; /* desc bh */ 3998 int cur_write_start = 0; /* start index of current log write */ 3999 int i; 4000 int flush; 4001 int wait_on_commit; 4002 struct reiserfs_journal_list *jl, *temp_jl; 4003 struct list_head *entry, *safe; 4004 unsigned long jindex; 4005 unsigned int commit_trans_id; 4006 int trans_half; 4007 int depth; 4008 4009 BUG_ON(th->t_refcount > 1); 4010 BUG_ON(!th->t_trans_id); 4011 BUG_ON(!th->t_super); 4012 4013 /* 4014 * protect flush_older_commits from doing mistakes if the 4015 * transaction ID counter gets overflowed. 4016 */ 4017 if (th->t_trans_id == ~0U) 4018 flags |= FLUSH_ALL | COMMIT_NOW | WAIT; 4019 flush = flags & FLUSH_ALL; 4020 wait_on_commit = flags & WAIT; 4021 4022 current->journal_info = th->t_handle_save; 4023 reiserfs_check_lock_depth(sb, "journal end"); 4024 if (journal->j_len == 0) { 4025 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 4026 1); 4027 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb)); 4028 } 4029 4030 lock_journal(sb); 4031 if (journal->j_next_full_flush) { 4032 flags |= FLUSH_ALL; 4033 flush = 1; 4034 } 4035 if (journal->j_next_async_flush) { 4036 flags |= COMMIT_NOW | WAIT; 4037 wait_on_commit = 1; 4038 } 4039 4040 /* 4041 * check_journal_end locks the journal, and unlocks if it does 4042 * not return 1 it tells us if we should continue with the 4043 * journal_end, or just return 4044 */ 4045 if (!check_journal_end(th, flags)) { 4046 reiserfs_schedule_old_flush(sb); 4047 wake_queued_writers(sb); 4048 reiserfs_async_progress_wait(sb); 4049 goto out; 4050 } 4051 4052 /* check_journal_end might set these, check again */ 4053 if (journal->j_next_full_flush) { 4054 flush = 1; 4055 } 4056 4057 /* 4058 * j must wait means we have to flush the log blocks, and the 4059 * real blocks for this transaction 4060 */ 4061 if (journal->j_must_wait > 0) { 4062 flush = 1; 4063 } 4064 #ifdef REISERFS_PREALLOCATE 4065 /* 4066 * quota ops might need to nest, setup the journal_info pointer 4067 * for them and raise the refcount so that it is > 0. 4068 */ 4069 current->journal_info = th; 4070 th->t_refcount++; 4071 4072 /* it should not involve new blocks into the transaction */ 4073 reiserfs_discard_all_prealloc(th); 4074 4075 th->t_refcount--; 4076 current->journal_info = th->t_handle_save; 4077 #endif 4078 4079 /* setup description block */ 4080 d_bh = 4081 journal_getblk(sb, 4082 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 4083 journal->j_start); 4084 set_buffer_uptodate(d_bh); 4085 desc = (struct reiserfs_journal_desc *)(d_bh)->b_data; 4086 memset(d_bh->b_data, 0, d_bh->b_size); 4087 memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8); 4088 set_desc_trans_id(desc, journal->j_trans_id); 4089 4090 /* 4091 * setup commit block. Don't write (keep it clean too) this one 4092 * until after everyone else is written 4093 */ 4094 c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 4095 ((journal->j_start + journal->j_len + 4096 1) % SB_ONDISK_JOURNAL_SIZE(sb))); 4097 commit = (struct reiserfs_journal_commit *)c_bh->b_data; 4098 memset(c_bh->b_data, 0, c_bh->b_size); 4099 set_commit_trans_id(commit, journal->j_trans_id); 4100 set_buffer_uptodate(c_bh); 4101 4102 /* init this journal list */ 4103 jl = journal->j_current_jl; 4104 4105 /* 4106 * we lock the commit before doing anything because 4107 * we want to make sure nobody tries to run flush_commit_list until 4108 * the new transaction is fully setup, and we've already flushed the 4109 * ordered bh list 4110 */ 4111 reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb); 4112 4113 /* save the transaction id in case we need to commit it later */ 4114 commit_trans_id = jl->j_trans_id; 4115 4116 atomic_set(&jl->j_older_commits_done, 0); 4117 jl->j_trans_id = journal->j_trans_id; 4118 jl->j_timestamp = journal->j_trans_start_time; 4119 jl->j_commit_bh = c_bh; 4120 jl->j_start = journal->j_start; 4121 jl->j_len = journal->j_len; 4122 atomic_set(&jl->j_nonzerolen, journal->j_len); 4123 atomic_set(&jl->j_commit_left, journal->j_len + 2); 4124 jl->j_realblock = NULL; 4125 4126 /* 4127 * The ENTIRE FOR LOOP MUST not cause schedule to occur. 4128 * for each real block, add it to the journal list hash, 4129 * copy into real block index array in the commit or desc block 4130 */ 4131 trans_half = journal_trans_half(sb->s_blocksize); 4132 for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) { 4133 if (buffer_journaled(cn->bh)) { 4134 jl_cn = get_cnode(sb); 4135 if (!jl_cn) { 4136 reiserfs_panic(sb, "journal-1676", 4137 "get_cnode returned NULL"); 4138 } 4139 if (i == 0) { 4140 jl->j_realblock = jl_cn; 4141 } 4142 jl_cn->prev = last_cn; 4143 jl_cn->next = NULL; 4144 if (last_cn) { 4145 last_cn->next = jl_cn; 4146 } 4147 last_cn = jl_cn; 4148 /* 4149 * make sure the block we are trying to log 4150 * is not a block of journal or reserved area 4151 */ 4152 if (is_block_in_log_or_reserved_area 4153 (sb, cn->bh->b_blocknr)) { 4154 reiserfs_panic(sb, "journal-2332", 4155 "Trying to log block %lu, " 4156 "which is a log block", 4157 cn->bh->b_blocknr); 4158 } 4159 jl_cn->blocknr = cn->bh->b_blocknr; 4160 jl_cn->state = 0; 4161 jl_cn->sb = sb; 4162 jl_cn->bh = cn->bh; 4163 jl_cn->jlist = jl; 4164 insert_journal_hash(journal->j_list_hash_table, jl_cn); 4165 if (i < trans_half) { 4166 desc->j_realblock[i] = 4167 cpu_to_le32(cn->bh->b_blocknr); 4168 } else { 4169 commit->j_realblock[i - trans_half] = 4170 cpu_to_le32(cn->bh->b_blocknr); 4171 } 4172 } else { 4173 i--; 4174 } 4175 } 4176 set_desc_trans_len(desc, journal->j_len); 4177 set_desc_mount_id(desc, journal->j_mount_id); 4178 set_desc_trans_id(desc, journal->j_trans_id); 4179 set_commit_trans_len(commit, journal->j_len); 4180 4181 /* 4182 * special check in case all buffers in the journal 4183 * were marked for not logging 4184 */ 4185 BUG_ON(journal->j_len == 0); 4186 4187 /* 4188 * we're about to dirty all the log blocks, mark the description block 4189 * dirty now too. Don't mark the commit block dirty until all the 4190 * others are on disk 4191 */ 4192 mark_buffer_dirty(d_bh); 4193 4194 /* 4195 * first data block is j_start + 1, so add one to 4196 * cur_write_start wherever you use it 4197 */ 4198 cur_write_start = journal->j_start; 4199 cn = journal->j_first; 4200 jindex = 1; /* start at one so we don't get the desc again */ 4201 while (cn) { 4202 clear_buffer_journal_new(cn->bh); 4203 /* copy all the real blocks into log area. dirty log blocks */ 4204 if (buffer_journaled(cn->bh)) { 4205 struct buffer_head *tmp_bh; 4206 char *addr; 4207 struct page *page; 4208 tmp_bh = 4209 journal_getblk(sb, 4210 SB_ONDISK_JOURNAL_1st_BLOCK(sb) + 4211 ((cur_write_start + 4212 jindex) % 4213 SB_ONDISK_JOURNAL_SIZE(sb))); 4214 set_buffer_uptodate(tmp_bh); 4215 page = cn->bh->b_page; 4216 addr = kmap(page); 4217 memcpy(tmp_bh->b_data, 4218 addr + offset_in_page(cn->bh->b_data), 4219 cn->bh->b_size); 4220 kunmap(page); 4221 mark_buffer_dirty(tmp_bh); 4222 jindex++; 4223 set_buffer_journal_dirty(cn->bh); 4224 clear_buffer_journaled(cn->bh); 4225 } else { 4226 /* 4227 * JDirty cleared sometime during transaction. 4228 * don't log this one 4229 */ 4230 reiserfs_warning(sb, "journal-2048", 4231 "BAD, buffer in journal hash, " 4232 "but not JDirty!"); 4233 brelse(cn->bh); 4234 } 4235 next = cn->next; 4236 free_cnode(sb, cn); 4237 cn = next; 4238 reiserfs_cond_resched(sb); 4239 } 4240 4241 /* 4242 * we are done with both the c_bh and d_bh, but 4243 * c_bh must be written after all other commit blocks, 4244 * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. 4245 */ 4246 4247 journal->j_current_jl = alloc_journal_list(sb); 4248 4249 /* now it is safe to insert this transaction on the main list */ 4250 list_add_tail(&jl->j_list, &journal->j_journal_list); 4251 list_add_tail(&jl->j_working_list, &journal->j_working_list); 4252 journal->j_num_work_lists++; 4253 4254 /* reset journal values for the next transaction */ 4255 journal->j_start = 4256 (journal->j_start + journal->j_len + 4257 2) % SB_ONDISK_JOURNAL_SIZE(sb); 4258 atomic_set(&journal->j_wcount, 0); 4259 journal->j_bcount = 0; 4260 journal->j_last = NULL; 4261 journal->j_first = NULL; 4262 journal->j_len = 0; 4263 journal->j_trans_start_time = 0; 4264 /* check for trans_id overflow */ 4265 if (++journal->j_trans_id == 0) 4266 journal->j_trans_id = 10; 4267 journal->j_current_jl->j_trans_id = journal->j_trans_id; 4268 journal->j_must_wait = 0; 4269 journal->j_len_alloc = 0; 4270 journal->j_next_full_flush = 0; 4271 journal->j_next_async_flush = 0; 4272 init_journal_hash(sb); 4273 4274 /* 4275 * make sure reiserfs_add_jh sees the new current_jl before we 4276 * write out the tails 4277 */ 4278 smp_mb(); 4279 4280 /* 4281 * tail conversion targets have to hit the disk before we end the 4282 * transaction. Otherwise a later transaction might repack the tail 4283 * before this transaction commits, leaving the data block unflushed 4284 * and clean, if we crash before the later transaction commits, the 4285 * data block is lost. 4286 */ 4287 if (!list_empty(&jl->j_tail_bh_list)) { 4288 depth = reiserfs_write_unlock_nested(sb); 4289 write_ordered_buffers(&journal->j_dirty_buffers_lock, 4290 journal, jl, &jl->j_tail_bh_list); 4291 reiserfs_write_lock_nested(sb, depth); 4292 } 4293 BUG_ON(!list_empty(&jl->j_tail_bh_list)); 4294 mutex_unlock(&jl->j_commit_mutex); 4295 4296 /* 4297 * honor the flush wishes from the caller, simple commits can 4298 * be done outside the journal lock, they are done below 4299 * 4300 * if we don't flush the commit list right now, we put it into 4301 * the work queue so the people waiting on the async progress work 4302 * queue don't wait for this proc to flush journal lists and such. 4303 */ 4304 if (flush) { 4305 flush_commit_list(sb, jl, 1); 4306 flush_journal_list(sb, jl, 1); 4307 } else if (!(jl->j_state & LIST_COMMIT_PENDING)) { 4308 /* 4309 * Avoid queueing work when sb is being shut down. Transaction 4310 * will be flushed on journal shutdown. 4311 */ 4312 if (sb->s_flags & SB_ACTIVE) 4313 queue_delayed_work(REISERFS_SB(sb)->commit_wq, 4314 &journal->j_work, HZ / 10); 4315 } 4316 4317 /* 4318 * if the next transaction has any chance of wrapping, flush 4319 * transactions that might get overwritten. If any journal lists 4320 * are very old flush them as well. 4321 */ 4322 first_jl: 4323 list_for_each_safe(entry, safe, &journal->j_journal_list) { 4324 temp_jl = JOURNAL_LIST_ENTRY(entry); 4325 if (journal->j_start <= temp_jl->j_start) { 4326 if ((journal->j_start + journal->j_trans_max + 1) >= 4327 temp_jl->j_start) { 4328 flush_used_journal_lists(sb, temp_jl); 4329 goto first_jl; 4330 } else if ((journal->j_start + 4331 journal->j_trans_max + 1) < 4332 SB_ONDISK_JOURNAL_SIZE(sb)) { 4333 /* 4334 * if we don't cross into the next 4335 * transaction and we don't wrap, there is 4336 * no way we can overlap any later transactions 4337 * break now 4338 */ 4339 break; 4340 } 4341 } else if ((journal->j_start + 4342 journal->j_trans_max + 1) > 4343 SB_ONDISK_JOURNAL_SIZE(sb)) { 4344 if (((journal->j_start + journal->j_trans_max + 1) % 4345 SB_ONDISK_JOURNAL_SIZE(sb)) >= 4346 temp_jl->j_start) { 4347 flush_used_journal_lists(sb, temp_jl); 4348 goto first_jl; 4349 } else { 4350 /* 4351 * we don't overlap anything from out start 4352 * to the end of the log, and our wrapped 4353 * portion doesn't overlap anything at 4354 * the start of the log. We can break 4355 */ 4356 break; 4357 } 4358 } 4359 } 4360 4361 journal->j_current_jl->j_list_bitmap = 4362 get_list_bitmap(sb, journal->j_current_jl); 4363 4364 if (!(journal->j_current_jl->j_list_bitmap)) { 4365 reiserfs_panic(sb, "journal-1996", 4366 "could not get a list bitmap"); 4367 } 4368 4369 atomic_set(&journal->j_jlock, 0); 4370 unlock_journal(sb); 4371 /* wake up any body waiting to join. */ 4372 clear_bit(J_WRITERS_QUEUED, &journal->j_state); 4373 wake_up(&journal->j_join_wait); 4374 4375 if (!flush && wait_on_commit && 4376 journal_list_still_alive(sb, commit_trans_id)) { 4377 flush_commit_list(sb, jl, 1); 4378 } 4379 out: 4380 reiserfs_check_lock_depth(sb, "journal end2"); 4381 4382 memset(th, 0, sizeof(*th)); 4383 /* 4384 * Re-set th->t_super, so we can properly keep track of how many 4385 * persistent transactions there are. We need to do this so if this 4386 * call is part of a failed restart_transaction, we can free it later 4387 */ 4388 th->t_super = sb; 4389 4390 return journal->j_errno; 4391 } 4392 4393 /* Send the file system read only and refuse new transactions */ 4394 void reiserfs_abort_journal(struct super_block *sb, int errno) 4395 { 4396 struct reiserfs_journal *journal = SB_JOURNAL(sb); 4397 if (test_bit(J_ABORTED, &journal->j_state)) 4398 return; 4399 4400 if (!journal->j_errno) 4401 journal->j_errno = errno; 4402 4403 sb->s_flags |= SB_RDONLY; 4404 set_bit(J_ABORTED, &journal->j_state); 4405 4406 #ifdef CONFIG_REISERFS_CHECK 4407 dump_stack(); 4408 #endif 4409 } 4410