From: Sage Weil <sage@newdream.net>
Date: Fri, 19 Mar 2010 20:24:39 +0000 (-0700)
Subject: ceph: fix snap rebuild condition
X-Git-Tag: v2.6.34-rc3~6^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ec4318bcb4c59d8b8bf7037c9f444a9887ccb265;p=pandora-kernel.git

ceph: fix snap rebuild condition

We were rebuilding the snap context when it was not necessary
(i.e. when the realm seq hadn't changed _and_ the parent seq
was still older), which caused page snapc pointers to not match
the realm's snapc pointer (even though the snap context itself
was identical).  This confused begin_write and put it into an
endless loop.

The correct logic is: rebuild snapc if _my_ realm seq changed, or
if my parent realm's seq is newer than mine (and thus mine needs
to be rebuilt too).

Signed-off-by: Sage Weil <sage@newdream.net>
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