rbd: allocate image object names with a slab allocator
The names of objects used for image object requests are always fixed size. So create a slab cache to manage them. Define a new function rbd_segment_name_free() to match rbd_segment_name() (which is what supplies the dynamically-allocated name buffer). This is part of: http://tracker.ceph.com/issues/3926Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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