From: Tejun Heo <tj@kernel.org>
Date: Fri, 22 May 2015 21:13:22 +0000 (-0400)
Subject: cgroup, block: implement task_get_css() and use it in bio_associate_current()
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~117^2~77
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ec438699a9ae0856c2ce20a50dd39cdc7e92a732;p=pandora-kernel.git

cgroup, block: implement task_get_css() and use it in bio_associate_current()

bio_associate_current() currently open codes task_css() and
css_tryget_online() to find and pin $current's blkcg css.  Abstract it
into task_get_css() which is implemented from cgroup side.  As a task
is always associated with an online css for every subsystem except
while the css_set update is propagating, task_get_css() retries till
css_tryget_online() succeeds.

This is a cleanup and shouldn't lead to noticeable behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

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