From: Tejun Heo <tj@kernel.org>
Date: Fri, 22 May 2015 21:13:36 +0000 (-0400)
Subject: writeback: add {CONFIG|BDI_CAP|FS}_CGROUP_WRITEBACK
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~117^2~63
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=89e9b9e07a390c50980d10aa37a04631db5a23ab;p=pandora-kernel.git

writeback: add {CONFIG|BDI_CAP|FS}_CGROUP_WRITEBACK

cgroup writeback requires support from both bdi and filesystem sides.
Add BDI_CAP_CGROUP_WRITEBACK and FS_CGROUP_WRITEBACK to indicate
support and enable BDI_CAP_CGROUP_WRITEBACK on block based bdi's by
default.  Also, define CONFIG_CGROUP_WRITEBACK which is enabled if
both MEMCG and BLK_CGROUP are enabled.

inode_cgwb_enabled() which determines whether a given inode's both bdi
and fs support cgroup writeback is added.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

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