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When the OSD sends back a sparse read reply, it contains an array of these structures. Define the structure and add a couple of helpers for dealing with them. Also add a place in struct ceph_osd_req_op to store the extent buffer, and code to free it if it's populated when the req is torn down. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Xiubo Li <xiubli@redhat.com> Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de> Reviewed-by: Milind Changire <mchangir@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>