tree 20a3c1c9b7a37e3266db0b8532fbeabf5ed42ab6
parent d2bb24e506596ad0c10e4a7f4b2fca88cc75c0bc
author Alex Elder <elder@inktank.com> 1342735979 -0500
committer Alex Elder <elder@inktank.com> 1349119848 -0500

rbd: rearrange rbd_header_from_disk()

This just moves code around for the most part.  It was pulled out as
a separate patch to avoid 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 <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>