f2fs: use wq_has_sleeper for cp_wait wait_queue

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

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-01-26 11:55:35 -08:00
commit 7c506896cf