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authorYan, Zheng <zheng.yan@oracle.com>2009-10-14 09:24:59 -0400
committerChris Mason <chris.mason@oracle.com>2009-10-14 10:32:48 -0400
commit86df7eb921a009515285e7171363fa57dd2d7d31 (patch)
tree884e8cda2535dc43cf57ce9fa273381b827d2f4f /fs/btrfs
parent5d5e103a70f74ae98e3965a4add1ab951d0651d1 (diff)
Btrfs: properly wait log writers during log sync
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>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/tree-log.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 4aff766d171a..f51bf13125c0 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -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;