md/r5cache: handle FLUSH and FUA
With raid5 cache, we committing data from journal device. When there is flush request, we need to flush journal device's cache. This was not needed in raid5 journal, because we will flush the journal before committing data to raid disks. This is similar to FUA, except that we also need flush journal for FUA. Otherwise, corruptions in earlier meta data will stop recovery from reaching FUA data. slightly changed the code by Shaohua Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Shaohua Li <shli@fb.com>
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