From: Alex Elder <elder@inktank.com>
Date: Wed, 6 Feb 2013 05:41:50 +0000 (-0600)
Subject: rbd: add barriers near done flag operations
X-Git-Tag: v3.9-rc1~41^2~21^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=077413082f9ade9ca4d9774dbdc81ee7256d8089;p=pandora-kernel.git

rbd: add barriers near done flag operations

Somehow, I missed this little item in Documentation/atomic_ops.txt:
    *** WARNING: atomic_read() and atomic_set() DO NOT IMPLY BARRIERS! ***

Create and use some helper functions that include the proper memory
barriers for manipulating the done field.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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