| commit.c (79feb521a44705262d15cc819a4117a447b11ea7) | commit.c (3339578f05787259917788f461f4196b7349c2a4) |
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| 1/* 2 * linux/fs/jbd2/commit.c 3 * 4 * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 5 * 6 * Copyright 1998 Red Hat corp --- All Rights Reserved 7 * 8 * This file is part of the Linux kernel and is made available under --- 317 unchanged lines hidden (view full) --- 326 int space_left = 0; 327 int first_tag = 0; 328 int tag_flag; 329 int i, to_free = 0; 330 int tag_bytes = journal_tag_bytes(journal); 331 struct buffer_head *cbh = NULL; /* For transactional checksums */ 332 __u32 crc32_sum = ~0; 333 struct blk_plug plug; | 1/* 2 * linux/fs/jbd2/commit.c 3 * 4 * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 5 * 6 * Copyright 1998 Red Hat corp --- All Rights Reserved 7 * 8 * This file is part of the Linux kernel and is made available under --- 317 unchanged lines hidden (view full) --- 326 int space_left = 0; 327 int first_tag = 0; 328 int tag_flag; 329 int i, to_free = 0; 330 int tag_bytes = journal_tag_bytes(journal); 331 struct buffer_head *cbh = NULL; /* For transactional checksums */ 332 __u32 crc32_sum = ~0; 333 struct blk_plug plug; |
| 334 /* Tail of the journal */ 335 unsigned long first_block; 336 tid_t first_tid; 337 int update_tail; |
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| 334 335 /* 336 * First job: lock down the current transaction and wait for 337 * all outstanding updates to complete. 338 */ 339 340 /* Do we need to erase the effects of a prior jbd2_journal_flush? */ 341 if (journal->j_flags & JBD2_FLUSHED) { --- 341 unchanged lines hidden (view full) --- 683 printk(KERN_WARNING 684 "JBD2: Detected IO errors while flushing file data " 685 "on %s\n", journal->j_devname); 686 if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) 687 jbd2_journal_abort(journal, err); 688 err = 0; 689 } 690 | 338 339 /* 340 * First job: lock down the current transaction and wait for 341 * all outstanding updates to complete. 342 */ 343 344 /* Do we need to erase the effects of a prior jbd2_journal_flush? */ 345 if (journal->j_flags & JBD2_FLUSHED) { --- 341 unchanged lines hidden (view full) --- 687 printk(KERN_WARNING 688 "JBD2: Detected IO errors while flushing file data " 689 "on %s\n", journal->j_devname); 690 if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) 691 jbd2_journal_abort(journal, err); 692 err = 0; 693 } 694 |
| 695 /* 696 * Get current oldest transaction in the log before we issue flush 697 * to the filesystem device. After the flush we can be sure that 698 * blocks of all older transactions are checkpointed to persistent 699 * storage and we will be safe to update journal start in the 700 * superblock with the numbers we get here. 701 */ 702 update_tail = 703 jbd2_journal_get_log_tail(journal, &first_tid, &first_block); 704 |
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| 691 write_lock(&journal->j_state_lock); | 705 write_lock(&journal->j_state_lock); |
| 706 if (update_tail) { 707 long freed = first_block - journal->j_tail; 708 709 if (first_block < journal->j_tail) 710 freed += journal->j_last - journal->j_first; 711 /* Update tail only if we free significant amount of space */ 712 if (freed < journal->j_maxlen / 4) 713 update_tail = 0; 714 } |
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| 692 J_ASSERT(commit_transaction->t_state == T_COMMIT); 693 commit_transaction->t_state = T_COMMIT_DFLUSH; 694 write_unlock(&journal->j_state_lock); | 715 J_ASSERT(commit_transaction->t_state == T_COMMIT); 716 commit_transaction->t_state = T_COMMIT_DFLUSH; 717 write_unlock(&journal->j_state_lock); |
| 718 |
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| 695 /* 696 * If the journal is not located on the file system device, 697 * then we must flush the file system device before we issue 698 * the commit record 699 */ 700 if (commit_transaction->t_need_data_flush && 701 (journal->j_fs_dev != journal->j_dev) && 702 (journal->j_flags & JBD2_BARRIER)) --- 134 unchanged lines hidden (view full) --- 837 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT) && 838 journal->j_flags & JBD2_BARRIER) { 839 blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL); 840 } 841 842 if (err) 843 jbd2_journal_abort(journal, err); 844 | 719 /* 720 * If the journal is not located on the file system device, 721 * then we must flush the file system device before we issue 722 * the commit record 723 */ 724 if (commit_transaction->t_need_data_flush && 725 (journal->j_fs_dev != journal->j_dev) && 726 (journal->j_flags & JBD2_BARRIER)) --- 134 unchanged lines hidden (view full) --- 861 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT) && 862 journal->j_flags & JBD2_BARRIER) { 863 blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL); 864 } 865 866 if (err) 867 jbd2_journal_abort(journal, err); 868 |
| 869 /* 870 * Now disk caches for filesystem device are flushed so we are safe to 871 * erase checkpointed transactions from the log by updating journal 872 * superblock. 873 */ 874 if (update_tail) 875 jbd2_update_log_tail(journal, first_tid, first_block); 876 |
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| 845 /* End of a transaction! Finally, we can do checkpoint 846 processing: any buffers committed as a result of this 847 transaction can be removed from any checkpoint list it was on 848 before. */ 849 850 jbd_debug(3, "JBD2: commit phase 6\n"); 851 852 J_ASSERT(list_empty(&commit_transaction->t_inode_list)); --- 213 unchanged lines hidden --- | 877 /* End of a transaction! Finally, we can do checkpoint 878 processing: any buffers committed as a result of this 879 transaction can be removed from any checkpoint list it was on 880 before. */ 881 882 jbd_debug(3, "JBD2: commit phase 6\n"); 883 884 J_ASSERT(list_empty(&commit_transaction->t_inode_list)); --- 213 unchanged lines hidden --- |