f2fs: split discard policy
There are many different scenarios such as fstrim, umount, urgent or background where we will issue discards, actually, they need use different policy in aspect of io aware, discard granularity, delay interval and so on. But now they just share one common discard policy, so there will be race when changing policy in between these scenarios, the interference of changing discard policy will be very serious. This patch changes to split discard policy for different scenarios. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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