tree c41312d8926e5f12f4f47426f46cce3da148c0a9
parent 0bbfdfe8d25fcc1d5c2edb6b060fb0c5cf66aff9
author Ilya Dryomov <ilya.dryomov@inktank.com> 1391428593 +0200
committer Sage Weil <sage@inktank.com> 1391798753 -0800

libceph: take map_sem for read in handle_reply()

Handling redirect replies requires both map_sem and request_mutex.
Taking map_sem unconditionally near the top of handle_reply() avoids
possible race conditions that arise from releasing request_mutex to be
able to acquire map_sem in redirect reply case.  (Lock ordering is:
map_sem, request_mutex, crush_mutex.)

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>