ceph/ceph — pull request #2494 by dillaman (2014-09-15 18:11:49+00:00)
Title: rbd: ObjectCacher reads can hang when reading sparse files

The pending read list was not properly flushed when empty objects
were read from a space file.

Signed-off-by: Jason Dillaman
(cherry picked from commit cdb7675a21c9107e3596c90c2b1598def3c6899f)