f2fs: wake up discard_thread iff there is a candidate
This patch fixes to avoid needless wake ups. Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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This patch fixes to avoid needless wake ups. Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>