raid5-cache: use a mempool for the metadata block
We only have a limited number in flight, so use a page based mempool. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NNeilBrown <neilb@suse.com>
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We only have a limited number in flight, so use a page based mempool. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NNeilBrown <neilb@suse.com>