summaryrefslogtreecommitdiff
path: root/include/linux/bio.h
diff options
context:
space:
mode:
authorDennis Zhou (Facebook) <dennisszhou@gmail.com>2018-09-11 21:41:29 +0300
committerJens Axboe <axboe@kernel.dk>2018-09-22 05:29:06 +0300
commita7b39b4e961c4e2b3ed837803a7441a65c90ce33 (patch)
tree7dda6dda4a341971504ccd16a44dbda27d57a0f8 /include/linux/bio.h
parent07b05bcc3213ac9f8c28c9d835b4bf3d5798cc60 (diff)
downloadlinux-a7b39b4e961c4e2b3ed837803a7441a65c90ce33.tar.xz
blkcg: always associate a bio with a blkg
Previously, blkg's were only assigned as needed by blk-iolatency and blk-throttle. bio->css was also always being associated while blkg was being looked up and then thrown away in blkcg_bio_issue_check. This patch begins the cleanup of bio->css and bio->bi_blkg by always associating a blkg in blkcg_bio_issue_check. This tries to create the blkg, but if it is not possible, falls back to using the root_blkg of the request_queue. Therefore, a bio will always be associated with a blkg. The duplicate association logic is removed from blk-throttle and blk-iolatency. Signed-off-by: Dennis Zhou <dennisszhou@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/bio.h')
-rw-r--r--include/linux/bio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 14b4fa266357..829cd0bb407d 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -542,11 +542,14 @@ static inline int bio_associate_blkcg_from_page(struct bio *bio,
#ifdef CONFIG_BLK_CGROUP
int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css);
int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg);
+int bio_associate_create_blkg(struct request_queue *q, struct bio *bio);
void bio_disassociate_task(struct bio *bio);
void bio_clone_blkcg_association(struct bio *dst, struct bio *src);
#else /* CONFIG_BLK_CGROUP */
static inline int bio_associate_blkcg(struct bio *bio,
struct cgroup_subsys_state *blkcg_css) { return 0; }
+static inline int bio_associate_create_blkg(struct request_queue *q,
+ struct bio *bio) { return 0; }
static inline void bio_disassociate_task(struct bio *bio) { }
static inline void bio_clone_blkcg_association(struct bio *dst,
struct bio *src) { }