blk-cgroup: replace bio_blkcg with bio_blkcg_css
All callers of bio_blkcg actually want the CSS, so replace it with an
interface that does return the CSS. This now allows to move
struct blkcg_gq to block/blk-cgroup.h instead of exposing it in a
public header.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 976cf98..fabcf64 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1829,12 +1829,14 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
cmd->blkcg_css = NULL;
cmd->memcg_css = NULL;
#ifdef CONFIG_BLK_CGROUP
- if (rq->bio && rq->bio->bi_blkg) {
- cmd->blkcg_css = &bio_blkcg(rq->bio)->css;
+ if (rq->bio) {
+ cmd->blkcg_css = bio_blkcg_css(rq->bio);
#ifdef CONFIG_MEMCG
- cmd->memcg_css =
- cgroup_get_e_css(cmd->blkcg_css->cgroup,
- &memory_cgrp_subsys);
+ if (cmd->blkcg_css) {
+ cmd->memcg_css =
+ cgroup_get_e_css(cmd->blkcg_css->cgroup,
+ &memory_cgrp_subsys);
+ }
#endif
}
#endif
