1/* 2 * linux/fs/jbd/checkpoint.c 3 * 4 * Written by Stephen C. Tweedie <sct@redhat.com>, 1999 5 * 6 * Copyright 1999 Red Hat Software --- All Rights Reserved 7 * 8 * This file is part of the Linux kernel and is made available under 9 * the terms of the GNU General Public License, version 2, or at your 10 * option, any later version, incorporated herein by reference. 11 * 12 * Checkpoint routines for the generic filesystem journaling code. 13 * Part of the ext2fs journaling system. 14 * 15 * Checkpointing is the process of ensuring that a section of the log is 16 * committed fully to disk, so that that portion of the log can be 17 * reused. 18 */ 19 20#include <linux/time.h> 21#include <linux/fs.h> 22#include <linux/jbd.h> 23#include <linux/errno.h> 24#include <linux/slab.h> 25 26/* 27 * Unlink a buffer from a transaction checkpoint list. 28 * 29 * Called with j_list_lock held. 30 */ 31static inline void __buffer_unlink_first(struct journal_head *jh) 32{ 33 transaction_t *transaction = jh->b_cp_transaction; 34 35 jh->b_cpnext->b_cpprev = jh->b_cpprev; 36 jh->b_cpprev->b_cpnext = jh->b_cpnext; 37 if (transaction->t_checkpoint_list == jh) { 38 transaction->t_checkpoint_list = jh->b_cpnext; 39 if (transaction->t_checkpoint_list == jh) 40 transaction->t_checkpoint_list = NULL; 41 } 42} 43 44/* 45 * Unlink a buffer from a transaction checkpoint(io) list. 46 * 47 * Called with j_list_lock held. 48 */ 49static inline void __buffer_unlink(struct journal_head *jh) 50{ 51 transaction_t *transaction = jh->b_cp_transaction; 52 53 __buffer_unlink_first(jh); 54 if (transaction->t_checkpoint_io_list == jh) { 55 transaction->t_checkpoint_io_list = jh->b_cpnext; 56 if (transaction->t_checkpoint_io_list == jh) 57 transaction->t_checkpoint_io_list = NULL; 58 } 59} 60 61/* 62 * Move a buffer from the checkpoint list to the checkpoint io list 63 * 64 * Called with j_list_lock held 65 */ 66static inline void __buffer_relink_io(struct journal_head *jh) 67{ 68 transaction_t *transaction = jh->b_cp_transaction; 69 70 __buffer_unlink_first(jh); 71 72 if (!transaction->t_checkpoint_io_list) { 73 jh->b_cpnext = jh->b_cpprev = jh; 74 } else { 75 jh->b_cpnext = transaction->t_checkpoint_io_list; 76 jh->b_cpprev = transaction->t_checkpoint_io_list->b_cpprev; 77 jh->b_cpprev->b_cpnext = jh; 78 jh->b_cpnext->b_cpprev = jh; 79 } 80 transaction->t_checkpoint_io_list = jh; 81} 82 83/* 84 * Try to release a checkpointed buffer from its transaction. 85 * Returns 1 if we released it and 2 if we also released the 86 * whole transaction. 87 * 88 * Requires j_list_lock 89 * Called under jbd_lock_bh_state(jh2bh(jh)), and drops it 90 */ 91static int __try_to_free_cp_buf(struct journal_head *jh) 92{ 93 int ret = 0; 94 struct buffer_head *bh = jh2bh(jh); 95 96 if (jh->b_jlist == BJ_None && !buffer_locked(bh) && 97 !buffer_dirty(bh) && !buffer_write_io_error(bh)) { 98 JBUFFER_TRACE(jh, "remove from checkpoint list"); 99 ret = __journal_remove_checkpoint(jh) + 1; 100 jbd_unlock_bh_state(bh); 101 journal_remove_journal_head(bh); 102 BUFFER_TRACE(bh, "release"); 103 __brelse(bh); 104 } else { 105 jbd_unlock_bh_state(bh); 106 } 107 return ret; 108} 109 110/* 111 * __log_wait_for_space: wait until there is space in the journal. 112 * 113 * Called under j-state_lock *only*. It will be unlocked if we have to wait 114 * for a checkpoint to free up some space in the log. 115 */ 116void __log_wait_for_space(journal_t *journal) 117{ 118 int nblocks, space_left; 119 assert_spin_locked(&journal->j_state_lock); 120 121 nblocks = jbd_space_needed(journal); 122 while (__log_space_left(journal) < nblocks) { 123 if (journal->j_flags & JFS_ABORT) 124 return; 125 spin_unlock(&journal->j_state_lock); 126 mutex_lock(&journal->j_checkpoint_mutex); 127 128 /* 129 * Test again, another process may have checkpointed while we 130 * were waiting for the checkpoint lock. If there are no 131 * transactions ready to be checkpointed, try to recover 132 * journal space by calling cleanup_journal_tail(), and if 133 * that doesn't work, by waiting for the currently committing 134 * transaction to complete. If there is absolutely no way 135 * to make progress, this is either a BUG or corrupted 136 * filesystem, so abort the journal and leave a stack 137 * trace for forensic evidence. 138 */ 139 spin_lock(&journal->j_state_lock); 140 spin_lock(&journal->j_list_lock); 141 nblocks = jbd_space_needed(journal); 142 space_left = __log_space_left(journal); 143 if (space_left < nblocks) { 144 int chkpt = journal->j_checkpoint_transactions != NULL; 145 tid_t tid = 0; 146 147 if (journal->j_committing_transaction) 148 tid = journal->j_committing_transaction->t_tid; 149 spin_unlock(&journal->j_list_lock); 150 spin_unlock(&journal->j_state_lock); 151 if (chkpt) { 152 log_do_checkpoint(journal); 153 } else if (cleanup_journal_tail(journal) == 0) { 154 /* We were able to recover space; yay! */ 155 ; 156 } else if (tid) { 157 log_wait_commit(journal, tid); 158 } else { 159 printk(KERN_ERR "%s: needed %d blocks and " 160 "only had %d space available\n", 161 __func__, nblocks, space_left); 162 printk(KERN_ERR "%s: no way to get more " 163 "journal space\n", __func__); 164 WARN_ON(1); 165 journal_abort(journal, 0); 166 } 167 spin_lock(&journal->j_state_lock); 168 } else { 169 spin_unlock(&journal->j_list_lock); 170 } 171 mutex_unlock(&journal->j_checkpoint_mutex); 172 } 173} 174 175/* 176 * We were unable to perform jbd_trylock_bh_state() inside j_list_lock. 177 * The caller must restart a list walk. Wait for someone else to run 178 * jbd_unlock_bh_state(). 179 */ 180static void jbd_sync_bh(journal_t *journal, struct buffer_head *bh) 181 __releases(journal->j_list_lock) 182{ 183 get_bh(bh); 184 spin_unlock(&journal->j_list_lock); 185 jbd_lock_bh_state(bh); 186 jbd_unlock_bh_state(bh); 187 put_bh(bh); 188} 189 190/* 191 * Clean up transaction's list of buffers submitted for io. 192 * We wait for any pending IO to complete and remove any clean 193 * buffers. Note that we take the buffers in the opposite ordering 194 * from the one in which they were submitted for IO. 195 * 196 * Return 0 on success, and return <0 if some buffers have failed 197 * to be written out. 198 * 199 * Called with j_list_lock held. 200 */ 201static int __wait_cp_io(journal_t *journal, transaction_t *transaction) 202{ 203 struct journal_head *jh; 204 struct buffer_head *bh; 205 tid_t this_tid; 206 int released = 0; 207 int ret = 0; 208 209 this_tid = transaction->t_tid; 210restart: 211 /* Did somebody clean up the transaction in the meanwhile? */ 212 if (journal->j_checkpoint_transactions != transaction || 213 transaction->t_tid != this_tid) 214 return ret; 215 while (!released && transaction->t_checkpoint_io_list) { 216 jh = transaction->t_checkpoint_io_list; 217 bh = jh2bh(jh); 218 if (!jbd_trylock_bh_state(bh)) { 219 jbd_sync_bh(journal, bh); 220 spin_lock(&journal->j_list_lock); 221 goto restart; 222 } 223 if (buffer_locked(bh)) { 224 atomic_inc(&bh->b_count); 225 spin_unlock(&journal->j_list_lock); 226 jbd_unlock_bh_state(bh); 227 wait_on_buffer(bh); 228 /* the journal_head may have gone by now */ 229 BUFFER_TRACE(bh, "brelse"); 230 __brelse(bh); 231 spin_lock(&journal->j_list_lock); 232 goto restart; 233 } 234 if (unlikely(buffer_write_io_error(bh))) 235 ret = -EIO; 236 237 /* 238 * Now in whatever state the buffer currently is, we know that 239 * it has been written out and so we can drop it from the list 240 */ 241 released = __journal_remove_checkpoint(jh); 242 jbd_unlock_bh_state(bh); 243 journal_remove_journal_head(bh); 244 __brelse(bh); 245 } 246 247 return ret; 248} 249 250#define NR_BATCH 64 251 252static void 253__flush_batch(journal_t *journal, struct buffer_head **bhs, int *batch_count) 254{ 255 int i; 256 257 for (i = 0; i < *batch_count; i++) 258 write_dirty_buffer(bhs[i], WRITE); 259 260 for (i = 0; i < *batch_count; i++) { 261 struct buffer_head *bh = bhs[i]; 262 clear_buffer_jwrite(bh); 263 BUFFER_TRACE(bh, "brelse"); 264 __brelse(bh); 265 } 266 *batch_count = 0; 267} 268 269/* 270 * Try to flush one buffer from the checkpoint list to disk. 271 * 272 * Return 1 if something happened which requires us to abort the current 273 * scan of the checkpoint list. Return <0 if the buffer has failed to 274 * be written out. 275 * 276 * Called with j_list_lock held and drops it if 1 is returned 277 * Called under jbd_lock_bh_state(jh2bh(jh)), and drops it 278 */ 279static int __process_buffer(journal_t *journal, struct journal_head *jh, 280 struct buffer_head **bhs, int *batch_count) 281{ 282 struct buffer_head *bh = jh2bh(jh); 283 int ret = 0; 284 285 if (buffer_locked(bh)) { 286 atomic_inc(&bh->b_count); 287 spin_unlock(&journal->j_list_lock); 288 jbd_unlock_bh_state(bh); 289 wait_on_buffer(bh); 290 /* the journal_head may have gone by now */ 291 BUFFER_TRACE(bh, "brelse"); 292 __brelse(bh); 293 ret = 1; 294 } else if (jh->b_transaction != NULL) { 295 transaction_t *t = jh->b_transaction; 296 tid_t tid = t->t_tid; 297 298 spin_unlock(&journal->j_list_lock); 299 jbd_unlock_bh_state(bh); 300 log_start_commit(journal, tid); 301 log_wait_commit(journal, tid); 302 ret = 1; 303 } else if (!buffer_dirty(bh)) { 304 ret = 1; 305 if (unlikely(buffer_write_io_error(bh))) 306 ret = -EIO; 307 J_ASSERT_JH(jh, !buffer_jbddirty(bh)); 308 BUFFER_TRACE(bh, "remove from checkpoint"); 309 __journal_remove_checkpoint(jh); 310 spin_unlock(&journal->j_list_lock); 311 jbd_unlock_bh_state(bh); 312 journal_remove_journal_head(bh); 313 __brelse(bh); 314 } else { 315 /* 316 * Important: we are about to write the buffer, and 317 * possibly block, while still holding the journal lock. 318 * We cannot afford to let the transaction logic start 319 * messing around with this buffer before we write it to 320 * disk, as that would break recoverability. 321 */ 322 BUFFER_TRACE(bh, "queue"); 323 get_bh(bh); 324 J_ASSERT_BH(bh, !buffer_jwrite(bh)); 325 set_buffer_jwrite(bh); 326 bhs[*batch_count] = bh; 327 __buffer_relink_io(jh); 328 jbd_unlock_bh_state(bh); 329 (*batch_count)++; 330 if (*batch_count == NR_BATCH) { 331 spin_unlock(&journal->j_list_lock); 332 __flush_batch(journal, bhs, batch_count); 333 ret = 1; 334 } 335 } 336 return ret; 337} 338 339/* 340 * Perform an actual checkpoint. We take the first transaction on the 341 * list of transactions to be checkpointed and send all its buffers 342 * to disk. We submit larger chunks of data at once. 343 * 344 * The journal should be locked before calling this function. 345 * Called with j_checkpoint_mutex held. 346 */ 347int log_do_checkpoint(journal_t *journal) 348{ 349 transaction_t *transaction; 350 tid_t this_tid; 351 int result; 352 353 jbd_debug(1, "Start checkpoint\n"); 354 355 /* 356 * First thing: if there are any transactions in the log which 357 * don't need checkpointing, just eliminate them from the 358 * journal straight away. 359 */ 360 result = cleanup_journal_tail(journal); 361 jbd_debug(1, "cleanup_journal_tail returned %d\n", result); 362 if (result <= 0) 363 return result; 364 365 /* 366 * OK, we need to start writing disk blocks. Take one transaction 367 * and write it. 368 */ 369 result = 0; 370 spin_lock(&journal->j_list_lock); 371 if (!journal->j_checkpoint_transactions) 372 goto out; 373 transaction = journal->j_checkpoint_transactions; 374 this_tid = transaction->t_tid; 375restart: 376 /* 377 * If someone cleaned up this transaction while we slept, we're 378 * done (maybe it's a new transaction, but it fell at the same 379 * address). 380 */ 381 if (journal->j_checkpoint_transactions == transaction && 382 transaction->t_tid == this_tid) { 383 int batch_count = 0; 384 struct buffer_head *bhs[NR_BATCH]; 385 struct journal_head *jh; 386 int retry = 0, err; 387 388 while (!retry && transaction->t_checkpoint_list) { 389 struct buffer_head *bh; 390 391 jh = transaction->t_checkpoint_list; 392 bh = jh2bh(jh); 393 if (!jbd_trylock_bh_state(bh)) { 394 jbd_sync_bh(journal, bh); 395 retry = 1; 396 break; 397 } 398 retry = __process_buffer(journal, jh, bhs,&batch_count); 399 if (retry < 0 && !result) 400 result = retry; 401 if (!retry && (need_resched() || 402 spin_needbreak(&journal->j_list_lock))) { 403 spin_unlock(&journal->j_list_lock); 404 retry = 1; 405 break; 406 } 407 } 408 409 if (batch_count) { 410 if (!retry) { 411 spin_unlock(&journal->j_list_lock); 412 retry = 1; 413 } 414 __flush_batch(journal, bhs, &batch_count); 415 } 416 417 if (retry) { 418 spin_lock(&journal->j_list_lock); 419 goto restart; 420 } 421 /* 422 * Now we have cleaned up the first transaction's checkpoint 423 * list. Let's clean up the second one 424 */ 425 err = __wait_cp_io(journal, transaction); 426 if (!result) 427 result = err; 428 } 429out: 430 spin_unlock(&journal->j_list_lock); 431 if (result < 0) 432 journal_abort(journal, result); 433 else 434 result = cleanup_journal_tail(journal); 435 436 return (result < 0) ? result : 0; 437} 438 439/* 440 * Check the list of checkpoint transactions for the journal to see if 441 * we have already got rid of any since the last update of the log tail 442 * in the journal superblock. If so, we can instantly roll the 443 * superblock forward to remove those transactions from the log. 444 * 445 * Return <0 on error, 0 on success, 1 if there was nothing to clean up. 446 * 447 * Called with the journal lock held. 448 * 449 * This is the only part of the journaling code which really needs to be 450 * aware of transaction aborts. Checkpointing involves writing to the 451 * main filesystem area rather than to the journal, so it can proceed 452 * even in abort state, but we must not update the super block if 453 * checkpointing may have failed. Otherwise, we would lose some metadata 454 * buffers which should be written-back to the filesystem. 455 */ 456 457int cleanup_journal_tail(journal_t *journal) 458{ 459 transaction_t * transaction; 460 tid_t first_tid; 461 unsigned int blocknr, freed; 462 463 if (is_journal_aborted(journal)) 464 return 1; 465 466 /* OK, work out the oldest transaction remaining in the log, and 467 * the log block it starts at. 468 * 469 * If the log is now empty, we need to work out which is the 470 * next transaction ID we will write, and where it will 471 * start. */ 472 473 spin_lock(&journal->j_state_lock); 474 spin_lock(&journal->j_list_lock); 475 transaction = journal->j_checkpoint_transactions; 476 if (transaction) { 477 first_tid = transaction->t_tid; 478 blocknr = transaction->t_log_start; 479 } else if ((transaction = journal->j_committing_transaction) != NULL) { 480 first_tid = transaction->t_tid; 481 blocknr = transaction->t_log_start; 482 } else if ((transaction = journal->j_running_transaction) != NULL) { 483 first_tid = transaction->t_tid; 484 blocknr = journal->j_head; 485 } else { 486 first_tid = journal->j_transaction_sequence; 487 blocknr = journal->j_head; 488 } 489 spin_unlock(&journal->j_list_lock); 490 J_ASSERT(blocknr != 0); 491 492 /* If the oldest pinned transaction is at the tail of the log 493 already then there's not much we can do right now. */ 494 if (journal->j_tail_sequence == first_tid) { 495 spin_unlock(&journal->j_state_lock); 496 return 1; 497 } 498 499 /* OK, update the superblock to recover the freed space. 500 * Physical blocks come first: have we wrapped beyond the end of 501 * the log? */ 502 freed = blocknr - journal->j_tail; 503 if (blocknr < journal->j_tail) 504 freed = freed + journal->j_last - journal->j_first; 505 506 jbd_debug(1, 507 "Cleaning journal tail from %d to %d (offset %u), " 508 "freeing %u\n", 509 journal->j_tail_sequence, first_tid, blocknr, freed); 510 511 journal->j_free += freed; 512 journal->j_tail_sequence = first_tid; 513 journal->j_tail = blocknr; 514 spin_unlock(&journal->j_state_lock); 515 if (!(journal->j_flags & JFS_ABORT)) 516 journal_update_superblock(journal, 1); 517 return 0; 518} 519 520 521/* Checkpoint list management */ 522 523/* 524 * journal_clean_one_cp_list 525 * 526 * Find all the written-back checkpoint buffers in the given list and release them. 527 * 528 * Called with the journal locked. 529 * Called with j_list_lock held. 530 * Returns number of bufers reaped (for debug) 531 */ 532 533static int journal_clean_one_cp_list(struct journal_head *jh, int *released) 534{ 535 struct journal_head *last_jh; 536 struct journal_head *next_jh = jh; 537 int ret, freed = 0; 538 539 *released = 0; 540 if (!jh) 541 return 0; 542 543 last_jh = jh->b_cpprev; 544 do { 545 jh = next_jh; 546 next_jh = jh->b_cpnext; 547 /* Use trylock because of the ranking */ 548 if (jbd_trylock_bh_state(jh2bh(jh))) { 549 ret = __try_to_free_cp_buf(jh); 550 if (ret) { 551 freed++; 552 if (ret == 2) { 553 *released = 1; 554 return freed; 555 } 556 } 557 } 558 /* 559 * This function only frees up some memory 560 * if possible so we dont have an obligation 561 * to finish processing. Bail out if preemption 562 * requested: 563 */ 564 if (need_resched()) 565 return freed; 566 } while (jh != last_jh); 567 568 return freed; 569} 570 571/* 572 * journal_clean_checkpoint_list 573 * 574 * Find all the written-back checkpoint buffers in the journal and release them. 575 * 576 * Called with the journal locked. 577 * Called with j_list_lock held. 578 * Returns number of buffers reaped (for debug) 579 */ 580 581int __journal_clean_checkpoint_list(journal_t *journal) 582{ 583 transaction_t *transaction, *last_transaction, *next_transaction; 584 int ret = 0; 585 int released; 586 587 transaction = journal->j_checkpoint_transactions; 588 if (!transaction) 589 goto out; 590 591 last_transaction = transaction->t_cpprev; 592 next_transaction = transaction; 593 do { 594 transaction = next_transaction; 595 next_transaction = transaction->t_cpnext; 596 ret += journal_clean_one_cp_list(transaction-> 597 t_checkpoint_list, &released); 598 /* 599 * This function only frees up some memory if possible so we 600 * dont have an obligation to finish processing. Bail out if 601 * preemption requested: 602 */ 603 if (need_resched()) 604 goto out; 605 if (released) 606 continue; 607 /* 608 * It is essential that we are as careful as in the case of 609 * t_checkpoint_list with removing the buffer from the list as 610 * we can possibly see not yet submitted buffers on io_list 611 */ 612 ret += journal_clean_one_cp_list(transaction-> 613 t_checkpoint_io_list, &released); 614 if (need_resched()) 615 goto out; 616 } while (transaction != last_transaction); 617out: 618 return ret; 619} 620 621/* 622 * journal_remove_checkpoint: called after a buffer has been committed 623 * to disk (either by being write-back flushed to disk, or being 624 * committed to the log). 625 * 626 * We cannot safely clean a transaction out of the log until all of the 627 * buffer updates committed in that transaction have safely been stored 628 * elsewhere on disk. To achieve this, all of the buffers in a 629 * transaction need to be maintained on the transaction's checkpoint 630 * lists until they have been rewritten, at which point this function is 631 * called to remove the buffer from the existing transaction's 632 * checkpoint lists. 633 * 634 * The function returns 1 if it frees the transaction, 0 otherwise. 635 * 636 * This function is called with the journal locked. 637 * This function is called with j_list_lock held. 638 * This function is called with jbd_lock_bh_state(jh2bh(jh)) 639 */ 640 641int __journal_remove_checkpoint(struct journal_head *jh) 642{ 643 transaction_t *transaction; 644 journal_t *journal; 645 int ret = 0; 646 647 JBUFFER_TRACE(jh, "entry"); 648 649 if ((transaction = jh->b_cp_transaction) == NULL) { 650 JBUFFER_TRACE(jh, "not on transaction"); 651 goto out; 652 } 653 journal = transaction->t_journal; 654 655 __buffer_unlink(jh); 656 jh->b_cp_transaction = NULL; 657 658 if (transaction->t_checkpoint_list != NULL || 659 transaction->t_checkpoint_io_list != NULL) 660 goto out; 661 JBUFFER_TRACE(jh, "transaction has no more buffers"); 662 663 /* 664 * There is one special case to worry about: if we have just pulled the 665 * buffer off a running or committing transaction's checkpoing list, 666 * then even if the checkpoint list is empty, the transaction obviously 667 * cannot be dropped! 668 * 669 * The locking here around t_state is a bit sleazy. 670 * See the comment at the end of journal_commit_transaction(). 671 */ 672 if (transaction->t_state != T_FINISHED) { 673 JBUFFER_TRACE(jh, "belongs to running/committing transaction"); 674 goto out; 675 } 676 677 /* OK, that was the last buffer for the transaction: we can now 678 safely remove this transaction from the log */ 679 680 __journal_drop_transaction(journal, transaction); 681 682 /* Just in case anybody was waiting for more transactions to be 683 checkpointed... */ 684 wake_up(&journal->j_wait_logspace); 685 ret = 1; 686out: 687 JBUFFER_TRACE(jh, "exit"); 688 return ret; 689} 690 691/* 692 * journal_insert_checkpoint: put a committed buffer onto a checkpoint 693 * list so that we know when it is safe to clean the transaction out of 694 * the log. 695 * 696 * Called with the journal locked. 697 * Called with j_list_lock held. 698 */ 699void __journal_insert_checkpoint(struct journal_head *jh, 700 transaction_t *transaction) 701{ 702 JBUFFER_TRACE(jh, "entry"); 703 J_ASSERT_JH(jh, buffer_dirty(jh2bh(jh)) || buffer_jbddirty(jh2bh(jh))); 704 J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); 705 706 jh->b_cp_transaction = transaction; 707 708 if (!transaction->t_checkpoint_list) { 709 jh->b_cpnext = jh->b_cpprev = jh; 710 } else { 711 jh->b_cpnext = transaction->t_checkpoint_list; 712 jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev; 713 jh->b_cpprev->b_cpnext = jh; 714 jh->b_cpnext->b_cpprev = jh; 715 } 716 transaction->t_checkpoint_list = jh; 717} 718 719/* 720 * We've finished with this transaction structure: adios... 721 * 722 * The transaction must have no links except for the checkpoint by this 723 * point. 724 * 725 * Called with the journal locked. 726 * Called with j_list_lock held. 727 */ 728 729void __journal_drop_transaction(journal_t *journal, transaction_t *transaction) 730{ 731 assert_spin_locked(&journal->j_list_lock); 732 if (transaction->t_cpnext) { 733 transaction->t_cpnext->t_cpprev = transaction->t_cpprev; 734 transaction->t_cpprev->t_cpnext = transaction->t_cpnext; 735 if (journal->j_checkpoint_transactions == transaction) 736 journal->j_checkpoint_transactions = 737 transaction->t_cpnext; 738 if (journal->j_checkpoint_transactions == transaction) 739 journal->j_checkpoint_transactions = NULL; 740 } 741 742 J_ASSERT(transaction->t_state == T_FINISHED); 743 J_ASSERT(transaction->t_buffers == NULL); 744 J_ASSERT(transaction->t_sync_datalist == NULL); 745 J_ASSERT(transaction->t_forget == NULL); 746 J_ASSERT(transaction->t_iobuf_list == NULL); 747 J_ASSERT(transaction->t_shadow_list == NULL); 748 J_ASSERT(transaction->t_log_list == NULL); 749 J_ASSERT(transaction->t_checkpoint_list == NULL); 750 J_ASSERT(transaction->t_checkpoint_io_list == NULL); 751 J_ASSERT(transaction->t_updates == 0); 752 J_ASSERT(journal->j_committing_transaction != transaction); 753 J_ASSERT(journal->j_running_transaction != transaction); 754 755 jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid); 756 kfree(transaction); 757} 758