From a947f3929bb1a7a266e3b098c9a247a652769307 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Sat, 22 Jan 2022 19:10:44 +0800 Subject: [PATCH] block: move blkcg initialization/destroy into disk allocation/release handler blkcg works on FS bio level, so it is reasonable to make both blkcg and gendisk sharing same lifetime. Meantime there won't be any FS IO when releasing disk, so safe to move blkcg initialization/destroy into disk allocation/release handler Long term, we can move blkcg into gendisk completely. Signed-off-by: Ming Lei Reviewed-by: Bart Van Assche Signed-off-by: Christoph Hellwig --- block/blk-core.c | 5 ----- block/blk-sysfs.c | 7 ------- block/genhd.c | 8 ++++++++ 3 files changed, 8 insertions(+), 12 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 839b13f0703e..26cc1f071f5c 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -490,17 +490,12 @@ struct request_queue *blk_alloc_queue(int node_id, bool alloc_srcu) PERCPU_REF_INIT_ATOMIC, GFP_KERNEL)) goto fail_stats; - if (blkcg_init_queue(q)) - goto fail_ref; - blk_queue_dma_alignment(q, 511); blk_set_default_limits(&q->limits); q->nr_requests = BLKDEV_DEFAULT_RQ; return q; -fail_ref: - percpu_ref_exit(&q->q_usage_counter); fail_stats: blk_free_queue_stats(q->stats); fail_split: diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 241ded62f458..220085109d7f 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -751,13 +751,6 @@ static void blk_exit_queue(struct request_queue *q) ioc_clear_queue(q); elevator_exit(q); } - - /* - * Remove all references to @q from the block cgroup controller before - * restoring @q->queue_lock to avoid that restoring this pointer causes - * e.g. blkcg_print_blkgs() to crash. - */ - blkcg_exit_queue(q); } /** diff --git a/block/genhd.c b/block/genhd.c index 11c761afd64f..9fc3ce7e563c 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1134,9 +1134,12 @@ static void disk_release(struct device *dev) blk_mq_cancel_work_sync(disk->queue); + blkcg_exit_queue(disk->queue); + disk_release_events(disk); kfree(disk->random); xa_destroy(&disk->part_tbl); + disk->queue->disk = NULL; blk_put_queue(disk->queue); @@ -1342,6 +1345,9 @@ struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, if (xa_insert(&disk->part_tbl, 0, disk->part0, GFP_KERNEL)) goto out_destroy_part_tbl; + if (blkcg_init_queue(q)) + goto out_erase_part0; + rand_initialize_disk(disk); disk_to_dev(disk)->class = &block_class; disk_to_dev(disk)->type = &disk_type; @@ -1354,6 +1360,8 @@ struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, #endif return disk; +out_erase_part0: + xa_erase(&disk->part_tbl, 0); out_destroy_part_tbl: xa_destroy(&disk->part_tbl); disk->part0->bd_disk = NULL; -- 2.50.1