From 85db36cfb3de1422aeafb4e2ce83396333b744bb Mon Sep 17 00:00:00 2001
From: Chris Mason <clm@fb.com>
Date: Thu, 23 Apr 2015 08:02:49 -0700
Subject: [PATCH] Btrfs: fix inode cache writeout

The code to fix stalls during free spache cache IO wasn't using
the correct root when waiting on the IO for inode caches.  This
is only a problem when the inode cache is enabled with

mount -o inode_cache

This fixes the inode cache writeout to preserve any error values and
makes sure not to override the root when inode cache writeout is done.

Reported-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
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