From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Wed, 20 Apr 2011 10:07:30 +0000 (+0000)
Subject: Btrfs: fix the race between reading and updating devices
X-Git-Tag: v3.0-rc1~38^2~5^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c9513edb0079f97749c2ac00c887a22c4ba44792;p=pandora-kernel.git

Btrfs: fix the race between reading and updating devices

On btrfs_congested_fn and __unplug_io_fn paths, we should hold
device_list_mutex to avoid remove/add device path to
update fs_devices->devices

On __btrfs_close_devices and btrfs_prepare_sprout paths, the devices in
fs_devices->devices or fs_devices->devices is updated, so we should hold
the mutex to avoid the reader side to reach them

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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