From 5cdf2e3fea5ee37b66842d76a9b06e6dac0b933d Mon Sep 17 00:00:00 2001 From: Dennis Zhou Date: Wed, 5 Dec 2018 12:10:31 -0500 Subject: blkcg: associate blkg when associating a device 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 Reviewed-by: Josef Bacik Signed-off-by: Jens Axboe --- block/bio.c | 1 + block/blk-iolatency.c | 4 +--- block/blk-throttle.c | 1 - 3 files changed, 2 insertions(+), 4 deletions(-) (limited to 'block') diff --git a/block/bio.c b/block/bio.c index 41ebb3f8e2fc..1e852ab904aa 100644 --- a/block/bio.c +++ b/block/bio.c @@ -2074,6 +2074,7 @@ void bio_associate_blkg(struct bio *bio) rcu_read_unlock(); } +EXPORT_SYMBOL_GPL(bio_associate_blkg); /** * bio_disassociate_task - undo bio_associate_current() diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c index cdbd10564e66..e6b47c255521 100644 --- a/block/blk-iolatency.c +++ b/block/blk-iolatency.c @@ -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) { diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 228c3a007ebc..1c6529df2002 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -2118,7 +2118,6 @@ static inline void throtl_update_latency_buckets(struct throtl_data *td) static void blk_throtl_assoc_bio(struct bio *bio) { #ifdef CONFIG_BLK_DEV_THROTTLING_LOW - bio_associate_blkg(bio); bio_issue_init(&bio->bi_issue, bio_sectors(bio)); #endif } -- cgit v1.2.3