This series makes a few small unrelated changes to the rbd code.
The first is a set of simple cleanups. The second makes
ceph_parse_options() return a pointer to make the interface
a little more obvious. The third gets rid of a duplicate
copy of the pointer to a ceph_client held in an rbd_device,
and the last one makes it so RBD_SNAP_HEAD_NAME is the only
way used for identifying the head snapshot.
-Alex
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