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blk-mq-debugfs: factor out a helper to register debugfs for all rq_qos

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There is already a helper blk_mq_debugfs_register_rqos() to register
one rqos, however this helper is called synchronously when the rqos is
created with queue frozen.

Prepare to fix possible deadlock to create blk-mq debugfs entries while
queue is still frozen.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai
2026-02-02 16:05:18 +08:00
committed by Jens Axboe
parent 41afaeeda5
commit 3f0bea9f3b
2 changed files with 20 additions and 8 deletions
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23
block/blk-mq-debugfs.c
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@@ -631,14 +631,7 @@ void blk_mq_debugfs_register(struct request_queue *q)
blk_mq_debugfs_register_hctx(q, hctx);
}
if (q->rq_qos) {
struct rq_qos *rqos = q->rq_qos;
while (rqos) {
blk_mq_debugfs_register_rqos(rqos);
rqos = rqos->next;
}
}
blk_mq_debugfs_register_rq_qos(q);
}
static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
@@ -769,6 +762,20 @@ void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
}
void blk_mq_debugfs_register_rq_qos(struct request_queue *q)
{
lockdep_assert_held(&q->debugfs_mutex);
if (q->rq_qos) {
struct rq_qos *rqos = q->rq_qos;
while (rqos) {
blk_mq_debugfs_register_rqos(rqos);
rqos = rqos->next;
}
}
}
void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
struct blk_mq_hw_ctx *hctx)
{