f2fs: wait for discard completion after submission

We don't need to wait for each discard commands when unmounting the image.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2017-02-22 19:58:23 -08:00
commit 40465257ac