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2017-02-13MD: add doc for raid5-cacheShaohua Li
I'm starting document of the raid5-cache feature. Please note this is a kernel doc instead of a mdadm manual, so I don't add the details about how to use the feature in mdadm side. Cc: NeilBrown <neilb@suse.com> Reviewed-by: Song Liu <songliubraving@fb.com> Signed-off-by: Shaohua Li <shli@fb.com>