cd7d469c2570 ("libceph: fail sparse-read if the data length doesn't match")
f628d7999727 ("libceph: add sparse read support to OSD client")
a679e50f7286 ("libceph: define struct ceph_sparse_extent and add some helpers")
08b8a0440eee ("libceph: add spinlock around osd->o_requests")