From: Tejun Heo <tj@kernel.org>
Date: Fri, 22 May 2015 22:23:32 +0000 (-0400)
Subject: writeback: update wb_over_bg_thresh() to use wb_domain aware operations
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~117^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=947e9762a8ddefda38aa21e249e6a4fec215cd12;p=pandora-kernel.git

writeback: update wb_over_bg_thresh() to use wb_domain aware operations

wb_over_bg_thresh() currently uses global_dirty_limits() and
wb_dirty_limit() both of which are wrappers around operations which
take dirty_throttle_control.  For cgroup writeback support, the
function will be updated to also consider memcg wb_domains which
requires the context information carried in dirty_throttle_control.

This patch updates wb_over_bg_thresh() so that it uses the underlying
wb_domain aware operations directly and builds the global
dirty_throttle_control in the process.

This patch doesn't introduce any behavioral changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Greg Thelen <gthelen@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

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