From 9e5c353510b26500bd6b8309823ac9ef2837b761 Mon Sep 17 00:00:00 2001
From: Slava Pestov <sp@daterainc.com>
Date: Thu, 1 May 2014 13:48:57 -0700
Subject: [PATCH] bcache: fix uninterruptible sleep in writeback thread

There were two issues here:

- writeback thread did not start until the device first became dirty
- writeback thread used uninterruptible sleep once running

Without this patch I see kernel warnings printed and a load average of
1.52 after booting my test VM. With this patch the warnings are gone and
the load average is near 0.00 as expected.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
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