From 9ba20527f4d1430b5f3e5f566be5af3e156a3284 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 29 Oct 2018 10:15:10 -0600 Subject: [PATCH] blk-mq: provide mq_ops->busy() hook We'll hook into this from blk_lld_busy(), allowing blk-mq to also return whether or not a given queue currently has requests in progress. Reviewed-by: Hannes Reinecke Tested-by: Ming Lei Reviewed-by: Omar Sandoval Signed-off-by: Jens Axboe --- block/blk-core.c | 2 ++ include/linux/blk-mq.h | 6 ++++++ 2 files changed, 8 insertions(+) diff --git a/block/blk-core.c b/block/blk-core.c index ce12515f9b9b..ca1a3af49f87 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -3431,6 +3431,8 @@ int blk_lld_busy(struct request_queue *q) { if (q->lld_busy_fn) return q->lld_busy_fn(q); + if (q->mq_ops && q->mq_ops->busy) + return q->mq_ops->busy(q); return 0; } diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 2286dc12c6bc..5c8418ebbfd6 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -114,6 +114,7 @@ typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *, typedef void (busy_tag_iter_fn)(struct request *, void *, bool); typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int); typedef int (map_queues_fn)(struct blk_mq_tag_set *set); +typedef bool (busy_fn)(struct request_queue *); struct blk_mq_ops { @@ -165,6 +166,11 @@ struct blk_mq_ops { /* Called from inside blk_get_request() */ void (*initialize_rq_fn)(struct request *rq); + /* + * If set, returns whether or not this queue currently is busy + */ + busy_fn *busy; + map_queues_fn *map_queues; #ifdef CONFIG_BLK_DEBUG_FS -- 2.30.2