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blkcg: remove bio->bi_css and instead use bio->bi_blkg

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Prior patches ensured that all bios are now associated with some blkg.
This now makes bio->bi_css unnecessary as blkg maintains a reference to
the blkcg already.

This patch removes the field bi_css and transfers corresponding uses to
access via bi_blkg.

Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dennis Zhou (Facebook) 2018-09-11 14:41:33 -04:00 • committed by Jens Axboe
parent bdc2491708
commit c839e7a03f
8 changed files with 25 additions and 62 deletions
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4
kernel/trace/blktrace.c
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@ -764,9 +764,9 @@ blk_trace_bio_get_cgid(struct request_queue *q, struct bio *bio)
if (!bt || !(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP))
return NULL;
if (!bio->bi_css)
if (!bio->bi_blkg)
return NULL;
return cgroup_get_kernfs_id(bio->bi_css->cgroup);
return cgroup_get_kernfs_id(bio_blkcg(bio)->css.cgroup);
}
#else
static union kernfs_node_id *