From: Sage Weil <sage@newdream.net>
Date: Sun, 6 Nov 2011 05:06:31 +0000 (-0700)
Subject: ceph: fix iput race when queueing inode work
X-Git-Tag: v3.2-rc3~22^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15a2015fbc692e1c97d7ce12d96e077f5ae7ea6d;p=pandora-kernel.git

ceph: fix iput race when queueing inode work

If we queue a work item that calls iput(), make sure we ihold() before
attempting to queue work. Otherwise our queued work might miraculously run
before we notice the queue_work() succeeded and call ihold(), allowing the
inode to be destroyed.

That is, instead of

	if (queue_work(...))
		ihold();

we need to do

	ihold();
	if (!queue_work(...))
		iput();

Reported-by: Amon Ott <a.ott@m-privacy.de>
Signed-off-by: Sage Weil <sage@newdream.net>
---

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