rbd: move snap_rwsem to the device, rename to header_rwsem
A new temporary header is allocated each time the header changes, but only the changed properties are copied over. We don't need a new semaphore for each header update. This addresses http://tracker.newdream.net/issues/2174 Signed-off-by:Josh Durgin <josh.durgin@dreamhost.com> Reviewed-by:
Alex Elder <elder@dreamhost.com>
parent
3489b42a
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