rbd: return an error when an invalid header is read
authorJosh Durgin <josh.durgin@dreamhost.com>
Tue, 15 Nov 2011 22:49:53 +0000 (14:49 -0800)
committerSage Weil <sage@newdream.net>
Wed, 7 Dec 2011 18:46:10 +0000 (10:46 -0800)
This protects against opening future rbd images that have incompatible format changes.

Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>

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