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| author | Tejun Heo <tj@kernel.org> | 2015-05-23 00:13:21 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-06-02 17:33:33 +0300 |
| commit | 496d5e7560dbb84399dbd92316fc33857aa83900 (patch) | |
| tree | 1e60d21e0c680643251ee309382abd7d46d11e67 /include/linux | |
| parent | 56161634e4824380a67243a4cf3fa52eb1e5d836 (diff) | |
| download | linux-496d5e7560dbb84399dbd92316fc33857aa83900.tar.xz | |
blkcg: add blkcg_root_css
Add global constant blkcg_root_css which points to &blkcg_root.css.
This will be used by cgroup writeback support. If blkcg is disabled,
it's defined as ERR_PTR(-EINVAL).
v2: The declarations moved to include/linux/blk-cgroup.h as suggested
by Vivek.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/blk-cgroup.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index 51f95b34d3f0..65f0c178fd04 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -134,6 +134,7 @@ struct blkcg_policy { }; extern struct blkcg blkcg_root; +extern struct cgroup_subsys_state * const blkcg_root_css; struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, struct request_queue *q); struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg, @@ -570,6 +571,8 @@ struct blkcg_gq { struct blkcg_policy { }; +#define blkcg_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL)) + #ifdef CONFIG_BLOCK static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; } |