Btrfs: wake up @scrub_pause_wait as much as we can

[firefly-linux-kernel-4.4.55.git] / fs / btrfs / scrub.c

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index f2f8803ea79cb722c466ca76dec9a3b1b732fd69..682ec3fca4a1b5d412523c68ed96c7292c95ee0c 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);
 }