Btrfs: btrfs_rm_dev_replace_blocked(): Use wait_event()

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 2 insertions, 11 deletions

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 92109b7c865c..5ec03d999c37 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -440,18 +440,9 @@ leave:
  */
 static void btrfs_rm_dev_replace_blocked(struct btrfs_fs_info *fs_info)
 {
-        s64 writers;
-        DEFINE_WAIT(wait);
-
         set_bit(BTRFS_FS_STATE_DEV_REPLACING, &fs_info->fs_state);
-        do {
-                prepare_to_wait(&fs_info->replace_wait, &wait,
-                                TASK_UNINTERRUPTIBLE);
-                writers = percpu_counter_sum(&fs_info->bio_counter);
-                if (writers)
-                        schedule();
-                finish_wait(&fs_info->replace_wait, &wait);
-        } while (writers);
+        wait_event(fs_info->replace_wait, !percpu_counter_sum(
+                   &fs_info->bio_counter));
 }
 
 /*