From: Filipe Manana <fdmanana@suse.com>
Date: Wed, 2 Jul 2014 19:07:54 +0000 (+0100)
Subject: Btrfs: read lock extent buffer while walking backrefs
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~48^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6f7ff6d7832c6be13e8c95598884dbc40ad69fb7;p=pandora-kernel.git

Btrfs: read lock extent buffer while walking backrefs

Before processing the extent buffer, acquire a read lock on it, so
that we're safe against concurrent updates on the extent buffer.

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