From: Josef Bacik <jbacik@fusionio.com>
Date: Fri, 20 Jul 2012 20:25:24 +0000 (-0400)
Subject: Btrfs: lock the transition from dirty to writeback for an eb
X-Git-Tag: v3.6-rc1~81^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51561ffec9614618f3da362f9d1b03a95b717484;p=pandora-kernel.git

Btrfs: lock the transition from dirty to writeback for an eb

There is a small window where an eb can have no IO bits set on it, which
could potentially result in extent_buffer_under_io() returning false when we
want it to return true, which could result in not fun things happening.  So
in order to protect this case we need to hold the refs_lock when we make
this transition to make sure we get reliable results out of
extent_buffer_udner_io().  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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