d cluttering up some upcoming patches which are more substantive. The point is basically to group everything related to initializing the snapshot context together. The only functional change is that rbd_header_from_disk() now ensures the (in-core) header it is passed is zero-filled. This allows a simpler error handling path in rbd_header_from_disk(). Signed-off-by: Alex Elder Reviewed-by: Josh Durgin ӑ