From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: [PATCH 08/49] blkcg: implement task_get_blkcg_css() Date: Mon, 6 Apr 2015 15:57:57 -0400 Message-ID: <1428350318-8215-9-git-send-email-tj@kernel.org> References: <1428350318-8215-1-git-send-email-tj@kernel.org> Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=6QhiKnG6awNOOoUyM/l2PLv1fwkjCAIuOPIXvUwqjBQ=; b=anJh4+ry/+nUW0QA2lD1hKjU6gqtb4QluOrzru3fTdgC72e89KeWzGBvnFBH91Bb70 /hmH6kb0mPR/eR3yWY7AuhcsD10X8fki4xhg30RE3kqPnj+Xu7KAb2YdxIJMFWrQk/db l5SyWmmN8r5Jc0Zbgz+h4K/AE2XcF+Vf9WPHCeiSuTcnpBsGXMI7tgqWb6TsVJtB7Brc AiA20HkVaGL7pz9OGAqU5HYp4mFAmOm0SlCnXdM79pyEgBNwUn//93/BGnHL6gU2zp/C zZa0dXvJbBnGgWlt+2G4nIB2O//qh7tIn3F/WtPCuViTeps8Y1zealz4wCRrtvu6ik5U abeQ== In-Reply-To: <1428350318-8215-1-git-send-email-tj@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: axboe@kernel.dk Cc: linux-kernel@vger.kernel.org, jack@suse.cz, hch@infradead.org, hannes@cmpxchg.org, linux-fsdevel@vger.kernel.org, vgoyal@redhat.com, lizefan@huawei.com, cgroups@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.cz, clm@fb.com, fengguang.wu@intel.com, david@fromorbit.com, gthelen@google.com, Tejun Heo 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 --- include/linux/blk-cgroup.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index 65f0c17..4dc643f 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -195,6 +195,12 @@ static inline struct blkcg *bio_blkcg(struct bio *bio) return task_blkcg(current); } +static inline struct cgroup_subsys_state * +task_get_blkcg_css(struct task_struct *task) +{ + return task_get_css(task, blkio_cgrp_id); +} + /** * blkcg_parent - get the parent of a blkcg * @blkcg: blkcg of interest @@ -573,6 +579,12 @@ struct blkcg_policy { #define blkcg_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL)) +static inline struct cgroup_subsys_state * +task_get_blkcg_css(struct task_struct *task) +{ + return NULL; +} + #ifdef CONFIG_BLOCK static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; } -- 2.1.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org