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blkcg: associate blkg when associating a device

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Previously, blkg association was handled by controller specific code in
blk-throttle and blk-iolatency. However, because a blkg represents a
relationship between a blkcg and a request_queue, it makes sense to keep
the blkg->q and bio->bi_disk->queue consistent.

This patch moves association into the bio_set_dev macro(). This should
cover the majority of cases where the device is set/changed keeping the
two pointers consistent. Fallback code is added to
blkcg_bio_issue_check() to catch any missing paths.

Signed-off-by: Dennis Zhou <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Dennis Zhou 2018-12-05 12:10:31 -05:00 • committed by Jens Axboe
commit 5cdf2e3fea
5 changed files with 14 additions and 12 deletions
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4
block/blk-iolatency.c
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@ -472,14 +472,12 @@ static void check_scale_change(struct iolatency_grp *iolat)
static void blkcg_iolatency_throttle(struct rq_qos *rqos, struct bio *bio)
{
struct blk_iolatency *blkiolat = BLKIOLATENCY(rqos);
struct blkcg_gq *blkg;
struct blkcg_gq *blkg = bio->bi_blkg;
bool issue_as_root = bio_issue_as_root_blkg(bio);
if (!blk_iolatency_enabled(blkiolat))
return;
bio_associate_blkg(bio);
blkg = bio->bi_blkg;
bio_issue_init(&bio->bi_issue, bio_sectors(bio));
while (blkg && blkg->parent) {