[RFC][PATCH v7 08/14] writeback: add memcg fields to writeback_control

[Greg Thelen <gthelen@google.com>]

Add writeback_control fields to differentiate between bdi-wide and
per-cgroup writeback.  Cgroup writeback is also able to differentiate
between writing inodes isolated to a particular cgroup and inodes shared
by multiple cgroups.

Signed-off-by: Greg Thelen <gthelen@google.com>
---
 include/linux/writeback.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index d10d133..4f5c0d2 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -47,6 +47,8 @@ struct writeback_control {
 	unsigned for_reclaim:1;		/* Invoked from the page allocator */
 	unsigned range_cyclic:1;	/* range_start is cyclic */
 	unsigned more_io:1;		/* more io to be dispatched */
+	unsigned for_cgroup:1;		/* enable cgroup writeback */
+	unsigned shared_inodes:1;	/* write inodes spanning cgroups */
 };
 
 /*
-- 
1.7.3.1

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