commit e93f3152357ca75284284bef8eeea7d45fe1bab1
author Alex Elder <elder@inktank.com> Wed May 08 22:50:04 2013 -0500
committer Alex Elder <elder@inktank.com> Mon May 13 15:06:44 2013 -0500
tree 772595e38dcf482119c938228c2e4db699bcbaa3
parent fb65d2284c117cfc28d30217d25a14a8e7a75a94

rbd: define parent image request routines

Define rbd_parent_request_create() and rbd_parent_request_destroy()
to handle the creation of parent image requests submitted for
layered image objects.  For simplicity, let rbd_img_request_put()
handle dropping the reference to any image request (parent or not),
and call whichever destructor is appropriate on the last put.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>