ceph: set up page array mempool with correct size
In create_fs_client() a memory pool is set up be used for arrays of pages that might be needed in ceph_writepages_start() if memory is tight. There are two problems with the way it's initialized: - The size provided is the number of pages we want in the array, but it should be the number of bytes required for that many page pointers. - The number of pages computed can end up being 0, while we will always need at least one page. This patch fixes both of these problems. This resolves the two simple problems defined in: http://tracker.ceph.com/issues/4603Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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