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| author |   Dennis Zhou (Facebook) <dennisszhou@gmail.com> | 2018-09-11 14:41:34 -0400 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2018-09-21 20:29:15 -0600 |
| commit | f0fcb3ec89f37167810e660b0595d9a6155d9807 (patch) | |
| tree | dd230c9477e3b316863a589639280965efcbf429 /include/linux/cgroup.h | |
| parent | blkcg: remove bio->bi_css and instead use bio->bi_blkg (diff) | |
| download | linux-dev-f0fcb3ec89f37167810e660b0595d9a6155d9807.tar.xz linux-dev-f0fcb3ec89f37167810e660b0595d9a6155d9807.zip | |
blkcg: remove additional reference to the css
The previous patch in this series removed carrying around a pointer to
the css in blkg. However, the blkg association logic still relied on
taking a reference on the css to ensure we wouldn't fail in getting a
reference for the blkg.
Here the implicit dependency on the css is removed. The association
continues to rely on the tryget logic walking up the blkg tree. This
streamlines the three ways that association can happen: normal, swap,
and writeback.
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/cgroup.h')
| -rw-r--r-- | include/linux/cgroup.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 32c553556bbd..b8bcbdeb2eac 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -93,6 +93,8 @@ extern struct css_set init_css_set; bool css_has_online_children(struct cgroup_subsys_state *css); struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss); +struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgroup, + struct cgroup_subsys *ss); struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup, struct cgroup_subsys *ss); struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry, |