[PATCH] f2fs: use wq_has_sleeper for cp_wait wait_queue

From: Jaegeuk Kim
Date: Tue Jan 26 2016 - 15:01:15 EST


We need to use wq_has_sleeper including smp_mb to consider cp_wait concurrency.

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/data.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index d0675e5..df4d4cc 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -74,8 +74,7 @@ static void f2fs_write_end_io(struct bio *bio)
dec_page_count(sbi, F2FS_WRITEBACK);
}

- if (!get_pages(sbi, F2FS_WRITEBACK) &&
- !list_empty(&sbi->cp_wait.task_list))
+ if (!get_pages(sbi, F2FS_WRITEBACK) && wq_has_sleeper(&sbi->cp_wait))
wake_up(&sbi->cp_wait);

bio_put(bio);
--
2.6.3