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Btrfs: fix the skipped transaction commit during the file sync 

We may abort the wait earlier if ->last_trans_log_full_commit was set to
the current transaction id, at this case, we need commit the current
transaction instead of the log sub-transaction. But the current code
didn't tell the caller to do it (return 0, not -EAGAIN). Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Miao Xie 2014-02-20 18:08:52 +08:00 committed by Josef Bacik
parent 5c902ba622
commit 48cab2e071
1 changed files with 16 additions and 10 deletions
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26
fs/btrfs/tree-log.c
View File

@ -2364,6 +2364,7 @@ static int wait_log_commit(struct btrfs_trans_handle *trans,
{
DEFINE_WAIT(wait);
int index = transid % 2;
int ret = 0;
/*
* we only allow two pending log transactions at a time,
@ -2371,21 +2372,26 @@ static int wait_log_commit(struct btrfs_trans_handle *trans,
* current transaction, we're done
*/
do {
if (ACCESS_ONCE(root->fs_info->last_trans_log_full_commit) ==
trans->transid) {
ret = -EAGAIN;
break;
}
prepare_to_wait(&root->log_commit_wait[index],
&wait, TASK_UNINTERRUPTIBLE);
mutex_unlock(&root->log_mutex);
if (ACCESS_ONCE(root->fs_info->last_trans_log_full_commit) !=
trans->transid && root->log_transid < transid + 2 &&
if (root->log_transid < transid + 2 &&
atomic_read(&root->log_commit[index]))
schedule();
finish_wait(&root->log_commit_wait[index], &wait);
mutex_lock(&root->log_mutex);
} while (ACCESS_ONCE(root->fs_info->last_trans_log_full_commit) !=
trans->transid && root->log_transid < transid + 2 &&
} while (root->log_transid < transid + 2 &&
atomic_read(&root->log_commit[index]));
return 0;
return ret;
}
static void wait_for_writer(struct btrfs_trans_handle *trans,
@ -2433,15 +2439,16 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
log_transid = root->log_transid;
index1 = root->log_transid % 2;
if (atomic_read(&root->log_commit[index1])) {
wait_log_commit(trans, root, root->log_transid);
ret = wait_log_commit(trans, root, root->log_transid);
mutex_unlock(&root->log_mutex);
return 0;
return ret;
}
atomic_set(&root->log_commit[index1], 1);
/* wait for previous tree log sync to complete */
if (atomic_read(&root->log_commit[(index1 + 1) % 2]))
wait_log_commit(trans, root, root->log_transid - 1);
while (1) {
int batch = atomic_read(&root->log_batch);
/* when we're on an ssd, just kick the log commit out */
@ -2529,11 +2536,10 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
if (atomic_read(&log_root_tree->log_commit[index2])) {
blk_finish_plug(&plug);
btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark);
wait_log_commit(trans, log_root_tree,
log_root_tree->log_transid);
ret = wait_log_commit(trans, log_root_tree,
log_root_tree->log_transid);
btrfs_free_logged_extents(log, log_transid);
mutex_unlock(&log_root_tree->log_mutex);
ret = 0;
goto out;
}
atomic_set(&log_root_tree->log_commit[index2], 1);