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5421681bc3
Currently issue io can grab queue_lock three times from bfq_bio_merge(), bfq_limit_depth() and bfq_prepare_request(), the queue_lock is not necessary if icq is already created because both queue and ioc can't be freed before io issuing is done, hence remove the unnecessary queue_lock and use rcu to protect radix tree lookup. Noted this is also a prep patch to support request batch dispatching[1]. [1] https://lore.kernel.org/all/20250722072431.610354-1-yukuai1@huaweicloud.com/ Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20250729023229.2944898-1-yukuai1@huaweicloud.com Signed-off-by: Jens Axboe <axboe@kernel.dk>