From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 6 Mar 2014 05:55:02 +0000 (+0800)
Subject: Btrfs: split the global ordered extents mutex
X-Git-Tag: v3.15-rc1~96^2~14
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=31f3d255c677073f83daa1e0671bbf2157bf8edc;p=pandora-kernel.git

Btrfs: split the global ordered extents mutex

When we create a snapshot, we just need wait the ordered extents in
the source fs/file root, but because we use the global mutex to protect
this ordered extents list of the source fs/file root to avoid accessing
a empty list, if someone got the mutex to access the ordered extents list
of the other fs/file root, we had to wait.

This patch splits the above global mutex, now every fs/file root has
its own mutex to protect its own list.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
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