blkcg: implement task_get_blkcg_css()

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Implement a wrapper around task_get_css() to acquire the blkcg css for
a given task.  The wrapper is necessary for cgroup writeback support
as there will be places outside blkcg proper trying to acquire
blkcg_css and blkio_cgrp_id will be undefined when !CONFIG_BLK_CGROUP.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>

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Tejun Heo 2015-05-22 17:13:23 -04:00 • committed by Jens Axboe

parent ec438699a9

commit fd383c2d3c

1 changed files with 12 additions and 0 deletions

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include/linux/blk-cgroup.h

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