From: Filipe Manana <fdmanana@gmail.com>
Date: Fri, 14 Mar 2014 20:55:01 +0000 (+0000)
Subject: Btrfs: fix race when updating existing ref head
X-Git-Tag: v3.15-rc1~96^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=21543baddcdbaa49db5ac8766ae564381e7c64d9;p=pandora-kernel.git

Btrfs: fix race when updating existing ref head

While we update an existing ref head's extent_op, we're not holding
its spinlock, so while we're updating its extent_op contents (key,
flags) we can have a task running __btrfs_run_delayed_refs() that
holds the ref head's lock and sets its extent_op to NULL right after
the task updating the ref head just checked its extent_op was not NULL.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>
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