Currently when the osd client gets a request that involves a bio list, it assumes the initiator (the rbd client) has taken an extra reference to the first bio on that list. When the request is done, the initiator calls ceph_osdc_release_request() and at that time the osd client drops that presumed reference. The second patch in this series simply gets rid of that extra reference entirely, because it's not needed. Doing this creates an incompatibility between differing versions of both rbd and the osd client (libceph). So The first patch adds a simple compatibility check capability so it's possible to avoid that causing any problems. -Alex [PATCH 1/2] libceph: add a compatibility check interface [PATCH 2/2] rbd: don't take extra bio reference for osd client -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
