From 3a9508b0221dfd290b95fb0ab199958fe078bbdf Mon Sep 17 00:00:00 2001
From: Chris Mason <clm@fb.com>
Date: Fri, 21 Aug 2015 10:05:39 -0700
Subject: [PATCH] btrfs: fix compile when block cgroups are not enabled

bio->bi_css and bio->bi_ioc don't exist when block cgroups are not on.
This adds an ifdef around them.  It's not perfect, but our
use of bi_ioc is being removed in the 4.3 merge window.

The bi_css usage really should go into bio_clone, but I want to make
sure that doesn't introduce problems for other bio_clone use cases.

Signed-off-by: Chris Mason <clm@fb.com>
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