f51667685749e (Theodore Ts'o 2017-12-17 22:00:59 -0500 1) // SPDX-License-Identifier: GPL-2.0+
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 2) /*
5886269962f94 (Uwe Kleine-König 2007-05-09 07:51:49 +0200 3) * linux/fs/jbd2/checkpoint.c
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 4) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 5) * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 6) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 7) * Copyright 1999 Red Hat Software --- All Rights Reserved
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 8) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 9) * Checkpoint routines for the generic filesystem journaling code.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 10) * Part of the ext2fs journaling system.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 11) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 12) * Checkpointing is the process of ensuring that a section of the log is
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 13) * committed fully to disk, so that that portion of the log can be
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 14) * reused.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 15) */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 16)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 17) #include <linux/time.h>
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 18) #include <linux/fs.h>
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 19) #include <linux/jbd2.h>
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 20) #include <linux/errno.h>
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 21) #include <linux/slab.h>
cc3e1bea5d876 (Theodore Ts'o 2009-12-23 06:52:08 -0500 22) #include <linux/blkdev.h>
879c5e6b7cb4c (Theodore Ts'o 2009-06-17 11:47:48 -0400 23) #include <trace/events/jbd2.h>
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 24)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 25) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 26) * Unlink a buffer from a transaction checkpoint list.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 27) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 28) * Called with j_list_lock held.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 29) */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 30) static inline void __buffer_unlink_first(struct journal_head *jh)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 31) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 32) transaction_t *transaction = jh->b_cp_transaction;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 33)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 34) jh->b_cpnext->b_cpprev = jh->b_cpprev;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 35) jh->b_cpprev->b_cpnext = jh->b_cpnext;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 36) if (transaction->t_checkpoint_list == jh) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 37) transaction->t_checkpoint_list = jh->b_cpnext;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 38) if (transaction->t_checkpoint_list == jh)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 39) transaction->t_checkpoint_list = NULL;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 40) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 41) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 42)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 43) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 44) * Unlink a buffer from a transaction checkpoint(io) list.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 45) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 46) * Called with j_list_lock held.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 47) */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 48) static inline void __buffer_unlink(struct journal_head *jh)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 49) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 50) transaction_t *transaction = jh->b_cp_transaction;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 51)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 52) __buffer_unlink_first(jh);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 53) if (transaction->t_checkpoint_io_list == jh) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 54) transaction->t_checkpoint_io_list = jh->b_cpnext;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 55) if (transaction->t_checkpoint_io_list == jh)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 56) transaction->t_checkpoint_io_list = NULL;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 57) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 58) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 59)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 60) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 61) * Move a buffer from the checkpoint list to the checkpoint io list
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 62) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 63) * Called with j_list_lock held
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 64) */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 65) static inline void __buffer_relink_io(struct journal_head *jh)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 66) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 67) transaction_t *transaction = jh->b_cp_transaction;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 68)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 69) __buffer_unlink_first(jh);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 70)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 71) if (!transaction->t_checkpoint_io_list) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 72) jh->b_cpnext = jh->b_cpprev = jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 73) } else {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 74) jh->b_cpnext = transaction->t_checkpoint_io_list;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 75) jh->b_cpprev = transaction->t_checkpoint_io_list->b_cpprev;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 76) jh->b_cpprev->b_cpnext = jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 77) jh->b_cpnext->b_cpprev = jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 78) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 79) transaction->t_checkpoint_io_list = jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 80) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 81)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 82) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 83) * Try to release a checkpointed buffer from its transaction.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 84) * Returns 1 if we released it and 2 if we also released the
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 85) * whole transaction.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 86) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 87) * Requires j_list_lock
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 88) */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 89) static int __try_to_free_cp_buf(struct journal_head *jh)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 90) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 91) int ret = 0;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 92) struct buffer_head *bh = jh2bh(jh);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 93)
932bb305ba2a0 (Jan Kara 2012-03-13 22:45:25 -0400 94) if (jh->b_transaction == NULL && !buffer_locked(bh) &&
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 95) !buffer_dirty(bh) && !buffer_write_io_error(bh)) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 96) JBUFFER_TRACE(jh, "remove from checkpoint list");
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 97) ret = __jbd2_journal_remove_checkpoint(jh) + 1;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 98) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 99) return ret;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 100) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 101)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 102) /*
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 103) * __jbd2_log_wait_for_space: wait until there is space in the journal.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 104) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 105) * Called under j-state_lock *only*. It will be unlocked if we have to wait
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 106) * for a checkpoint to free up some space in the log.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 107) */
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 108) void __jbd2_log_wait_for_space(journal_t *journal)
05d5233df85e9 (Theodore Ts'o 2020-11-07 00:00:49 -0500 109) __acquires(&journal->j_state_lock)
05d5233df85e9 (Theodore Ts'o 2020-11-07 00:00:49 -0500 110) __releases(&journal->j_state_lock)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 111) {
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 112) int nblocks, space_left;
a931da6ac9331 (Theodore Ts'o 2010-08-03 21:35:12 -0400 113) /* assert_spin_locked(&journal->j_state_lock); */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 114)
77444ac4f9537 (Jan Kara 2019-11-05 17:44:25 +0100 115) nblocks = journal->j_max_transaction_buffers;
76c3990456100 (Jan Kara 2013-06-04 12:12:57 -0400 116) while (jbd2_log_space_left(journal) < nblocks) {
a931da6ac9331 (Theodore Ts'o 2010-08-03 21:35:12 -0400 117) write_unlock(&journal->j_state_lock);
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 118) mutex_lock_io(&journal->j_checkpoint_mutex);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 119)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 120) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 121) * Test again, another process may have checkpointed while we
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 122) * were waiting for the checkpoint lock. If there are no
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 123) * transactions ready to be checkpointed, try to recover
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 124) * journal space by calling cleanup_journal_tail(), and if
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 125) * that doesn't work, by waiting for the currently committing
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 126) * transaction to complete. If there is absolutely no way
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 127) * to make progress, this is either a BUG or corrupted
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 128) * filesystem, so abort the journal and leave a stack
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 129) * trace for forensic evidence.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 130) */
a931da6ac9331 (Theodore Ts'o 2010-08-03 21:35:12 -0400 131) write_lock(&journal->j_state_lock);
1245799f752fa (Dmitry Monakhov 2014-09-16 14:50:50 -0400 132) if (journal->j_flags & JBD2_ABORT) {
1245799f752fa (Dmitry Monakhov 2014-09-16 14:50:50 -0400 133) mutex_unlock(&journal->j_checkpoint_mutex);
1245799f752fa (Dmitry Monakhov 2014-09-16 14:50:50 -0400 134) return;
1245799f752fa (Dmitry Monakhov 2014-09-16 14:50:50 -0400 135) }
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 136) spin_lock(&journal->j_list_lock);
76c3990456100 (Jan Kara 2013-06-04 12:12:57 -0400 137) space_left = jbd2_log_space_left(journal);
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 138) if (space_left < nblocks) {
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 139) int chkpt = journal->j_checkpoint_transactions != NULL;
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 140) tid_t tid = 0;
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 141)
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 142) if (journal->j_committing_transaction)
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 143) tid = journal->j_committing_transaction->t_tid;
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 144) spin_unlock(&journal->j_list_lock);
a931da6ac9331 (Theodore Ts'o 2010-08-03 21:35:12 -0400 145) write_unlock(&journal->j_state_lock);
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 146) if (chkpt) {
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 147) jbd2_log_do_checkpoint(journal);
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 148) } else if (jbd2_cleanup_journal_tail(journal) == 0) {
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 149) /* We were able to recover space; yay! */
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 150) ;
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 151) } else if (tid) {
0ef54180e0187 (Paul Gortmaker 2013-06-12 22:47:35 -0400 152) /*
0ef54180e0187 (Paul Gortmaker 2013-06-12 22:47:35 -0400 153) * jbd2_journal_commit_transaction() may want
0ef54180e0187 (Paul Gortmaker 2013-06-12 22:47:35 -0400 154) * to take the checkpoint_mutex if JBD2_FLUSHED
0ef54180e0187 (Paul Gortmaker 2013-06-12 22:47:35 -0400 155) * is set. So we need to temporarily drop it.
0ef54180e0187 (Paul Gortmaker 2013-06-12 22:47:35 -0400 156) */
0ef54180e0187 (Paul Gortmaker 2013-06-12 22:47:35 -0400 157) mutex_unlock(&journal->j_checkpoint_mutex);
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 158) jbd2_log_wait_commit(journal, tid);
0ef54180e0187 (Paul Gortmaker 2013-06-12 22:47:35 -0400 159) write_lock(&journal->j_state_lock);
0ef54180e0187 (Paul Gortmaker 2013-06-12 22:47:35 -0400 160) continue;
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 161) } else {
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 162) printk(KERN_ERR "%s: needed %d blocks and "
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 163) "only had %d space available\n",
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 164) __func__, nblocks, space_left);
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 165) printk(KERN_ERR "%s: no way to get more "
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 166) "journal space in %s\n", __func__,
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 167) journal->j_devname);
8c3f25d8950c3 (Theodore Ts'o 2008-11-06 22:38:07 -0500 168) WARN_ON(1);
51f57b01e4a3c (zhangyi (F) 2019-12-04 20:46:12 +0800 169) jbd2_journal_abort(journal, -EIO);
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 170) }
a931da6ac9331 (Theodore Ts'o 2010-08-03 21:35:12 -0400 171) write_lock(&journal->j_state_lock);
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 172) } else {
23f8b79eae8a7 (Duane Griffin 2008-10-08 23:28:31 -0400 173) spin_unlock(&journal->j_list_lock);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 174) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 175) mutex_unlock(&journal->j_checkpoint_mutex);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 176) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 177) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 178)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 179) static void
1a0d3786dd57d (Theodore Ts'o 2008-11-05 00:09:22 -0500 180) __flush_batch(journal_t *journal, int *batch_count)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 181) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 182) int i;
d3ad8434aa83e (Tao Ma 2011-06-27 12:36:29 -0400 183) struct blk_plug plug;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 184)
d3ad8434aa83e (Tao Ma 2011-06-27 12:36:29 -0400 185) blk_start_plug(&plug);
9cb569d601e0b (Christoph Hellwig 2010-08-11 17:06:24 +0200 186) for (i = 0; i < *batch_count; i++)
70fd76140a6cb (Christoph Hellwig 2016-11-01 07:40:10 -0600 187) write_dirty_buffer(journal->j_chkpt_bhs[i], REQ_SYNC);
d3ad8434aa83e (Tao Ma 2011-06-27 12:36:29 -0400 188) blk_finish_plug(&plug);
9cb569d601e0b (Christoph Hellwig 2010-08-11 17:06:24 +0200 189)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 190) for (i = 0; i < *batch_count; i++) {
1a0d3786dd57d (Theodore Ts'o 2008-11-05 00:09:22 -0500 191) struct buffer_head *bh = journal->j_chkpt_bhs[i];
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 192) BUFFER_TRACE(bh, "brelse");
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 193) __brelse(bh);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 194) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 195) *batch_count = 0;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 196) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 197)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 198) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 199) * Perform an actual checkpoint. We take the first transaction on the
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 200) * list of transactions to be checkpointed and send all its buffers
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 201) * to disk. We submit larger chunks of data at once.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 202) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 203) * The journal should be locked before calling this function.
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 204) * Called with j_checkpoint_mutex held.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 205) */
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 206) int jbd2_log_do_checkpoint(journal_t *journal)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 207) {
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 208) struct journal_head *jh;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 209) struct buffer_head *bh;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 210) transaction_t *transaction;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 211) tid_t this_tid;
dc6e8d669cf5c (Theodore Ts'o 2014-09-04 18:09:22 -0400 212) int result, batch_count = 0;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 213)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 214) jbd_debug(1, "Start checkpoint\n");
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 215)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 216) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 217) * First thing: if there are any transactions in the log which
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 218) * don't need checkpointing, just eliminate them from the
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 219) * journal straight away.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 220) */
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 221) result = jbd2_cleanup_journal_tail(journal);
879c5e6b7cb4c (Theodore Ts'o 2009-06-17 11:47:48 -0400 222) trace_jbd2_checkpoint(journal, result);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 223) jbd_debug(1, "cleanup_journal_tail returned %d\n", result);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 224) if (result <= 0)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 225) return result;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 226)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 227) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 228) * OK, we need to start writing disk blocks. Take one transaction
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 229) * and write it.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 230) */
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 231) result = 0;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 232) spin_lock(&journal->j_list_lock);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 233) if (!journal->j_checkpoint_transactions)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 234) goto out;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 235) transaction = journal->j_checkpoint_transactions;
8e85fb3f305b2 (Johann Lombardi 2008-01-28 23:58:27 -0500 236) if (transaction->t_chp_stats.cs_chp_time == 0)
8e85fb3f305b2 (Johann Lombardi 2008-01-28 23:58:27 -0500 237) transaction->t_chp_stats.cs_chp_time = jiffies;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 238) this_tid = transaction->t_tid;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 239) restart:
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 240) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 241) * If someone cleaned up this transaction while we slept, we're
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 242) * done (maybe it's a new transaction, but it fell at the same
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 243) * address).
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 244) */
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 245) if (journal->j_checkpoint_transactions != transaction ||
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 246) transaction->t_tid != this_tid)
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 247) goto out;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 248)
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 249) /* checkpoint all of the transaction's buffers */
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 250) while (transaction->t_checkpoint_list) {
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 251) jh = transaction->t_checkpoint_list;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 252) bh = jh2bh(jh);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 253)
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 254) if (buffer_locked(bh)) {
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 255) get_bh(bh);
ccd3c4373eacb (Jan Kara 2018-10-05 18:44:40 -0400 256) spin_unlock(&journal->j_list_lock);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 257) wait_on_buffer(bh);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 258) /* the journal_head may have gone by now */
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 259) BUFFER_TRACE(bh, "brelse");
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 260) __brelse(bh);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 261) goto retry;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 262) }
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 263) if (jh->b_transaction != NULL) {
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 264) transaction_t *t = jh->b_transaction;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 265) tid_t tid = t->t_tid;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 266)
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 267) transaction->t_chp_stats.cs_forced_to_close++;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 268) spin_unlock(&journal->j_list_lock);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 269) if (unlikely(journal->j_flags & JBD2_UNMOUNT))
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 270) /*
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 271) * The journal thread is dead; so
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 272) * starting and waiting for a commit
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 273) * to finish will cause us to wait for
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 274) * a _very_ long time.
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 275) */
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 276) printk(KERN_ERR
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 277) "JBD2: %s: Waiting for Godot: block %llu\n",
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 278) journal->j_devname, (unsigned long long) bh->b_blocknr);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 279)
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 280) if (batch_count)
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 281) __flush_batch(journal, &batch_count);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 282) jbd2_log_start_commit(journal, tid);
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 283) /*
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 284) * jbd2_journal_commit_transaction() may want
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 285) * to take the checkpoint_mutex if JBD2_FLUSHED
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 286) * is set, jbd2_update_log_tail() called by
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 287) * jbd2_journal_commit_transaction() may also take
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 288) * checkpoint_mutex. So we need to temporarily
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 289) * drop it.
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 290) */
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 291) mutex_unlock(&journal->j_checkpoint_mutex);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 292) jbd2_log_wait_commit(journal, tid);
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 293) mutex_lock_io(&journal->j_checkpoint_mutex);
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 294) spin_lock(&journal->j_list_lock);
53cf978457325 (Xiaoguang Wang 2019-01-31 23:42:11 -0500 295) goto restart;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 296) }
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 297) if (!buffer_dirty(bh)) {
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 298) if (unlikely(buffer_write_io_error(bh)) && !result)
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 299) result = -EIO;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 300) BUFFER_TRACE(bh, "remove from checkpoint");
0e5ecf0a76262 (Jan Kara 2014-09-04 18:09:29 -0400 301) if (__jbd2_journal_remove_checkpoint(jh))
0e5ecf0a76262 (Jan Kara 2014-09-04 18:09:29 -0400 302) /* The transaction was released; we're done */
0e5ecf0a76262 (Jan Kara 2014-09-04 18:09:29 -0400 303) goto out;
0e5ecf0a76262 (Jan Kara 2014-09-04 18:09:29 -0400 304) continue;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 305) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 306) /*
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 307) * Important: we are about to write the buffer, and
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 308) * possibly block, while still holding the journal
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 309) * lock. We cannot afford to let the transaction
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 310) * logic start messing around with this buffer before
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 311) * we write it to disk, as that would break
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 312) * recoverability.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 313) */
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 314) BUFFER_TRACE(bh, "queue");
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 315) get_bh(bh);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 316) J_ASSERT_BH(bh, !buffer_jwrite(bh));
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 317) journal->j_chkpt_bhs[batch_count++] = bh;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 318) __buffer_relink_io(jh);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 319) transaction->t_chp_stats.cs_written++;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 320) if ((batch_count == JBD2_NR_BATCH) ||
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 321) need_resched() ||
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 322) spin_needbreak(&journal->j_list_lock))
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 323) goto unlock_and_flush;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 324) }
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 325)
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 326) if (batch_count) {
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 327) unlock_and_flush:
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 328) spin_unlock(&journal->j_list_lock);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 329) retry:
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 330) if (batch_count)
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 331) __flush_batch(journal, &batch_count);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 332) spin_lock(&journal->j_list_lock);
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 333) goto restart;
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 334) }
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 335)
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 336) /*
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 337) * Now we issued all of the transaction's buffers, let's deal
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 338) * with the buffers that are out for I/O.
be1158cc615fd (Theodore Ts'o 2014-09-01 21:19:01 -0400 339) */
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 340) restart2:
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 341) /* Did somebody clean up the transaction in the meanwhile? */
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 342) if (journal->j_checkpoint_transactions != transaction ||
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 343) transaction->t_tid != this_tid)
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 344) goto out;
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 345)
dc6e8d669cf5c (Theodore Ts'o 2014-09-04 18:09:22 -0400 346) while (transaction->t_checkpoint_io_list) {
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 347) jh = transaction->t_checkpoint_io_list;
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 348) bh = jh2bh(jh);
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 349) if (buffer_locked(bh)) {
dc6e8d669cf5c (Theodore Ts'o 2014-09-04 18:09:22 -0400 350) get_bh(bh);
ccd3c4373eacb (Jan Kara 2018-10-05 18:44:40 -0400 351) spin_unlock(&journal->j_list_lock);
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 352) wait_on_buffer(bh);
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 353) /* the journal_head may have gone by now */
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 354) BUFFER_TRACE(bh, "brelse");
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 355) __brelse(bh);
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 356) spin_lock(&journal->j_list_lock);
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 357) goto restart2;
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 358) }
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 359) if (unlikely(buffer_write_io_error(bh)) && !result)
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 360) result = -EIO;
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 361)
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 362) /*
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 363) * Now in whatever state the buffer currently is, we
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 364) * know that it has been written out and so we can
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 365) * drop it from the list
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 366) */
dc6e8d669cf5c (Theodore Ts'o 2014-09-04 18:09:22 -0400 367) if (__jbd2_journal_remove_checkpoint(jh))
dc6e8d669cf5c (Theodore Ts'o 2014-09-04 18:09:22 -0400 368) break;
88fe1acb5bedf (Theodore Ts'o 2014-09-01 21:26:09 -0400 369) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 370) out:
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 371) spin_unlock(&journal->j_list_lock);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 372) if (result < 0)
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 373) jbd2_journal_abort(journal, result);
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 374) else
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 375) result = jbd2_cleanup_journal_tail(journal);
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 376)
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 377) return (result < 0) ? result : 0;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 378) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 379)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 380) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 381) * Check the list of checkpoint transactions for the journal to see if
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 382) * we have already got rid of any since the last update of the log tail
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 383) * in the journal superblock. If so, we can instantly roll the
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 384) * superblock forward to remove those transactions from the log.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 385) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 386) * Return <0 on error, 0 on success, 1 if there was nothing to clean up.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 387) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 388) * Called with the journal lock held.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 389) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 390) * This is the only part of the journaling code which really needs to be
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 391) * aware of transaction aborts. Checkpointing involves writing to the
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 392) * main filesystem area rather than to the journal, so it can proceed
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 393) * even in abort state, but we must not update the super block if
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 394) * checkpointing may have failed. Otherwise, we would lose some metadata
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 395) * buffers which should be written-back to the filesystem.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 396) */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 397)
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 398) int jbd2_cleanup_journal_tail(journal_t *journal)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 399) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 400) tid_t first_tid;
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 401) unsigned long blocknr;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 402)
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 403) if (is_journal_aborted(journal))
6f6a6fda29450 (Joseph Qi 2015-06-15 14:36:01 -0400 404) return -EIO;
44519faf22ad6 (Hidehiro Kawai 2008-10-10 20:29:13 -0400 405)
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 406) if (!jbd2_journal_get_log_tail(journal, &first_tid, &blocknr))
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 407) return 1;
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 408) J_ASSERT(blocknr != 0);
cc3e1bea5d876 (Theodore Ts'o 2009-12-23 06:52:08 -0500 409)
cc3e1bea5d876 (Theodore Ts'o 2009-12-23 06:52:08 -0500 410) /*
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 411) * We need to make sure that any blocks that were recently written out
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 412) * --- perhaps by jbd2_log_do_checkpoint() --- are flushed out before
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 413) * we drop the transactions from the journal. It's unlikely this will
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 414) * be necessary, especially with an appropriately sized journal, but we
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 415) * need this to guarantee correctness. Fortunately
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 416) * jbd2_cleanup_journal_tail() doesn't get called all that often.
cc3e1bea5d876 (Theodore Ts'o 2009-12-23 06:52:08 -0500 417) */
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 418) if (journal->j_flags & JBD2_BARRIER)
c6bf3f0e25f4c (Christoph Hellwig 2021-01-26 15:52:35 +0100 419) blkdev_issue_flush(journal->j_fs_dev);
79feb521a4470 (Jan Kara 2012-03-13 22:22:54 -0400 420)
6f6a6fda29450 (Joseph Qi 2015-06-15 14:36:01 -0400 421) return __jbd2_update_log_tail(journal, first_tid, blocknr);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 422) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 423)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 424)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 425) /* Checkpoint list management */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 426)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 427) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 428) * journal_clean_one_cp_list
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 429) *
de1b794130b13 (Jan Kara 2011-06-13 15:38:22 -0400 430) * Find all the written-back checkpoint buffers in the given list and
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 431) * release them. If 'destroy' is set, clean all buffers unconditionally.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 432) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 433) * Called with j_list_lock held.
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 434) * Returns 1 if we freed the transaction, 0 otherwise.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 435) */
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 436) static int journal_clean_one_cp_list(struct journal_head *jh, bool destroy)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 437) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 438) struct journal_head *last_jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 439) struct journal_head *next_jh = jh;
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 440) int ret;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 441)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 442) if (!jh)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 443) return 0;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 444)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 445) last_jh = jh->b_cpprev;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 446) do {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 447) jh = next_jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 448) next_jh = jh->b_cpnext;
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 449) if (!destroy)
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 450) ret = __try_to_free_cp_buf(jh);
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 451) else
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 452) ret = __jbd2_journal_remove_checkpoint(jh) + 1;
cc97f1a7c7eed (Jan Kara 2014-09-18 00:42:16 -0400 453) if (!ret)
33d14975e5ac4 (Jan Kara 2015-10-17 22:35:09 -0400 454) return 0;
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 455) if (ret == 2)
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 456) return 1;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 457) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 458) * This function only frees up some memory
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 459) * if possible so we dont have an obligation
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 460) * to finish processing. Bail out if preemption
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 461) * requested:
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 462) */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 463) if (need_resched())
33d14975e5ac4 (Jan Kara 2015-10-17 22:35:09 -0400 464) return 0;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 465) } while (jh != last_jh);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 466)
33d14975e5ac4 (Jan Kara 2015-10-17 22:35:09 -0400 467) return 0;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 468) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 469)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 470) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 471) * journal_clean_checkpoint_list
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 472) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 473) * Find all the written-back checkpoint buffers in the journal and release them.
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 474) * If 'destroy' is set, release all buffers unconditionally.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 475) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 476) * Called with j_list_lock held.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 477) */
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 478) void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 479) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 480) transaction_t *transaction, *last_transaction, *next_transaction;
cc97f1a7c7eed (Jan Kara 2014-09-18 00:42:16 -0400 481) int ret;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 482)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 483) transaction = journal->j_checkpoint_transactions;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 484) if (!transaction)
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 485) return;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 486)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 487) last_transaction = transaction->t_cpprev;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 488) next_transaction = transaction;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 489) do {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 490) transaction = next_transaction;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 491) next_transaction = transaction->t_cpnext;
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 492) ret = journal_clean_one_cp_list(transaction->t_checkpoint_list,
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 493) destroy);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 494) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 495) * This function only frees up some memory if possible so we
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 496) * dont have an obligation to finish processing. Bail out if
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 497) * preemption requested:
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 498) */
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 499) if (need_resched())
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 500) return;
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 501) if (ret)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 502) continue;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 503) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 504) * It is essential that we are as careful as in the case of
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 505) * t_checkpoint_list with removing the buffer from the list as
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 506) * we can possibly see not yet submitted buffers on io_list
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 507) */
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 508) ret = journal_clean_one_cp_list(transaction->
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 509) t_checkpoint_io_list, destroy);
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 510) if (need_resched())
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 511) return;
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 512) /*
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 513) * Stop scanning if we couldn't free the transaction. This
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 514) * avoids pointless scanning of transactions which still
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 515) * weren't checkpointed.
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 516) */
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 517) if (!ret)
50849db32a9f5 (Jan Kara 2014-09-18 00:58:12 -0400 518) return;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 519) } while (transaction != last_transaction);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 520) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 521)
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 522) /*
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 523) * Remove buffers from all checkpoint lists as journal is aborted and we just
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 524) * need to free memory
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 525) */
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 526) void jbd2_journal_destroy_checkpoint(journal_t *journal)
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 527) {
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 528) /*
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 529) * We loop because __jbd2_journal_clean_checkpoint_list() may abort
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 530) * early due to a need of rescheduling.
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 531) */
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 532) while (1) {
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 533) spin_lock(&journal->j_list_lock);
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 534) if (!journal->j_checkpoint_transactions) {
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 535) spin_unlock(&journal->j_list_lock);
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 536) break;
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 537) }
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 538) __jbd2_journal_clean_checkpoint_list(journal, true);
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 539) spin_unlock(&journal->j_list_lock);
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 540) cond_resched();
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 541) }
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 542) }
841df7df19623 (Jan Kara 2015-07-28 14:57:14 -0400 543)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 544) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 545) * journal_remove_checkpoint: called after a buffer has been committed
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 546) * to disk (either by being write-back flushed to disk, or being
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 547) * committed to the log).
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 548) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 549) * We cannot safely clean a transaction out of the log until all of the
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 550) * buffer updates committed in that transaction have safely been stored
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 551) * elsewhere on disk. To achieve this, all of the buffers in a
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 552) * transaction need to be maintained on the transaction's checkpoint
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 553) * lists until they have been rewritten, at which point this function is
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 554) * called to remove the buffer from the existing transaction's
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 555) * checkpoint lists.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 556) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 557) * The function returns 1 if it frees the transaction, 0 otherwise.
de1b794130b13 (Jan Kara 2011-06-13 15:38:22 -0400 558) * The function can free jh and bh.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 559) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 560) * This function is called with j_list_lock held.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 561) */
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 562) int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 563) {
bf6993276f74d (Theodore Ts'o 2009-09-30 00:32:06 -0400 564) struct transaction_chp_stats_s *stats;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 565) transaction_t *transaction;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 566) journal_t *journal;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 567) int ret = 0;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 568)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 569) JBUFFER_TRACE(jh, "entry");
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 570)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 571) if ((transaction = jh->b_cp_transaction) == NULL) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 572) JBUFFER_TRACE(jh, "not on transaction");
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 573) goto out;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 574) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 575) journal = transaction->t_journal;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 576)
de1b794130b13 (Jan Kara 2011-06-13 15:38:22 -0400 577) JBUFFER_TRACE(jh, "removing from transaction");
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 578) __buffer_unlink(jh);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 579) jh->b_cp_transaction = NULL;
de1b794130b13 (Jan Kara 2011-06-13 15:38:22 -0400 580) jbd2_journal_put_journal_head(jh);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 581)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 582) if (transaction->t_checkpoint_list != NULL ||
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 583) transaction->t_checkpoint_io_list != NULL)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 584) goto out;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 585)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 586) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 587) * There is one special case to worry about: if we have just pulled the
f5a7a6b0d9b6a (Jan Kara 2008-01-28 23:58:27 -0500 588) * buffer off a running or committing transaction's checkpoing list,
f5a7a6b0d9b6a (Jan Kara 2008-01-28 23:58:27 -0500 589) * then even if the checkpoint list is empty, the transaction obviously
f5a7a6b0d9b6a (Jan Kara 2008-01-28 23:58:27 -0500 590) * cannot be dropped!
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 591) *
f5a7a6b0d9b6a (Jan Kara 2008-01-28 23:58:27 -0500 592) * The locking here around t_state is a bit sleazy.
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 593) * See the comment at the end of jbd2_journal_commit_transaction().
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 594) */
de1b794130b13 (Jan Kara 2011-06-13 15:38:22 -0400 595) if (transaction->t_state != T_FINISHED)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 596) goto out;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 597)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 598) /* OK, that was the last buffer for the transaction: we can now
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 599) safely remove this transaction from the log */
bf6993276f74d (Theodore Ts'o 2009-09-30 00:32:06 -0400 600) stats = &transaction->t_chp_stats;
bf6993276f74d (Theodore Ts'o 2009-09-30 00:32:06 -0400 601) if (stats->cs_chp_time)
bf6993276f74d (Theodore Ts'o 2009-09-30 00:32:06 -0400 602) stats->cs_chp_time = jbd2_time_diff(stats->cs_chp_time,
bf6993276f74d (Theodore Ts'o 2009-09-30 00:32:06 -0400 603) jiffies);
bf6993276f74d (Theodore Ts'o 2009-09-30 00:32:06 -0400 604) trace_jbd2_checkpoint_stats(journal->j_fs_dev->bd_dev,
bf6993276f74d (Theodore Ts'o 2009-09-30 00:32:06 -0400 605) transaction->t_tid, stats);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 606)
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 607) __jbd2_journal_drop_transaction(journal, transaction);
0c2022eccb016 (Yongqiang Yang 2012-02-20 17:53:02 -0500 608) jbd2_journal_free_transaction(transaction);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 609) ret = 1;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 610) out:
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 611) return ret;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 612) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 613)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 614) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 615) * journal_insert_checkpoint: put a committed buffer onto a checkpoint
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 616) * list so that we know when it is safe to clean the transaction out of
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 617) * the log.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 618) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 619) * Called with the journal locked.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 620) * Called with j_list_lock held.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 621) */
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 622) void __jbd2_journal_insert_checkpoint(struct journal_head *jh,
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 623) transaction_t *transaction)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 624) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 625) JBUFFER_TRACE(jh, "entry");
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 626) J_ASSERT_JH(jh, buffer_dirty(jh2bh(jh)) || buffer_jbddirty(jh2bh(jh)));
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 627) J_ASSERT_JH(jh, jh->b_cp_transaction == NULL);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 628)
de1b794130b13 (Jan Kara 2011-06-13 15:38:22 -0400 629) /* Get reference for checkpointing transaction */
de1b794130b13 (Jan Kara 2011-06-13 15:38:22 -0400 630) jbd2_journal_grab_journal_head(jh2bh(jh));
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 631) jh->b_cp_transaction = transaction;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 632)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 633) if (!transaction->t_checkpoint_list) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 634) jh->b_cpnext = jh->b_cpprev = jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 635) } else {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 636) jh->b_cpnext = transaction->t_checkpoint_list;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 637) jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 638) jh->b_cpprev->b_cpnext = jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 639) jh->b_cpnext->b_cpprev = jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 640) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 641) transaction->t_checkpoint_list = jh;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 642) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 643)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 644) /*
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 645) * We've finished with this transaction structure: adios...
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 646) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 647) * The transaction must have no links except for the checkpoint by this
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 648) * point.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 649) *
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 650) * Called with the journal locked.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 651) * Called with j_list_lock held.
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 652) */
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 653)
f7f4bccb72984 (Mingming Cao 2006-10-11 01:20:59 -0700 654) void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 655) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 656) assert_spin_locked(&journal->j_list_lock);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 657) if (transaction->t_cpnext) {
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 658) transaction->t_cpnext->t_cpprev = transaction->t_cpprev;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 659) transaction->t_cpprev->t_cpnext = transaction->t_cpnext;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 660) if (journal->j_checkpoint_transactions == transaction)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 661) journal->j_checkpoint_transactions =
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 662) transaction->t_cpnext;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 663) if (journal->j_checkpoint_transactions == transaction)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 664) journal->j_checkpoint_transactions = NULL;
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 665) }
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 666)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 667) J_ASSERT(transaction->t_state == T_FINISHED);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 668) J_ASSERT(transaction->t_buffers == NULL);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 669) J_ASSERT(transaction->t_forget == NULL);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 670) J_ASSERT(transaction->t_shadow_list == NULL);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 671) J_ASSERT(transaction->t_checkpoint_list == NULL);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 672) J_ASSERT(transaction->t_checkpoint_io_list == NULL);
a51dca9cd3bb4 (Theodore Ts'o 2010-08-02 08:43:25 -0400 673) J_ASSERT(atomic_read(&transaction->t_updates) == 0);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 674) J_ASSERT(journal->j_committing_transaction != transaction);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 675) J_ASSERT(journal->j_running_transaction != transaction);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 676)
2201c590dd6e8 (Seiji Aguchi 2012-02-20 17:53:01 -0500 677) trace_jbd2_drop_transaction(journal, transaction);
2201c590dd6e8 (Seiji Aguchi 2012-02-20 17:53:01 -0500 678)
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 679) jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);
470decc613ab2 (Dave Kleikamp 2006-10-11 01:20:57 -0700 680) }
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