Btrfs: wake up @scrub_pause_wait as much as we can

check if @scrubs_running=@scrubs_paused condition inside wait_event()
is not an atomic operation which means we may inc/dec @scrub_running/
paused at any time. Let's wake up @scrub_pause_wait as much as we can
to let commit transaction blocked less.

An example below:

Thread1				Thread2
|->scrub_blocked_if_needed()	|->scrub_pending_trans_workers_inc
  |->increase @scrub_paused
                                       |->increase @scrub_running
  |->wake up scrub_pause_wait list
                                       |->scrub blocked
                                       |->increase @scrub_paused

Thread3 is commiting transaction which is blocked at btrfs_scrub_pause().
So after Thread2 increase @scrub_paused, we meet the condition
@scrub_paused=@scrub_running, but transaction will be still blocked until
another calling to wake up @scrub_pause_wait.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index f2f8803..682ec3f 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -315,6 +315,16 @@ static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
        atomic_inc(&fs_info->scrubs_running);
        atomic_inc(&fs_info->scrubs_paused);
        mutex_unlock(&fs_info->scrub_lock);
+
+       /*
+        * check if @scrubs_running=@scrubs_paused condition
+        * inside wait_event() is not an atomic operation.
+        * which means we may inc/dec @scrub_running/paused
+        * at any time. Let's wake up @scrub_pause_wait as
+        * much as we can to let commit transaction blocked less.
+        */
+       wake_up(&fs_info->scrub_pause_wait);
+
        atomic_inc(&sctx->workers_pending);
 }