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Btrfs: properly wait log writers during log sync

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A recently fsync optimization make btrfs_sync_log skip calling
wait_for_writer in the single log writer case. This is incorrect
since the writer count can also be increased by btrfs_pin_log.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng 2009-10-14 09:24:59 -04:00 committed by Chris Mason
parent 5d5e103a70
commit 86df7eb921
1 changed files with 6 additions and 5 deletions
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11
fs/btrfs/tree-log.c
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@ -1995,12 +1995,13 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
if (atomic_read(&root->log_commit[(index1 + 1) % 2]))
wait_log_commit(trans, root, root->log_transid - 1);
while (root->log_multiple_pids) {
while (1) {
unsigned long batch = root->log_batch;
mutex_unlock(&root->log_mutex);
schedule_timeout_uninterruptible(1);
mutex_lock(&root->log_mutex);
if (root->log_multiple_pids) {
mutex_unlock(&root->log_mutex);
schedule_timeout_uninterruptible(1);
mutex_lock(&root->log_mutex);
}
wait_for_writer(trans, root);
if (batch == root->log_batch)
break;