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block: split elevator_switch
Split an elevator_disable helper from elevator_switch for the case where we want to switch to no scheduler at all. This includes removing the pointless elevator_switch_mq helper and removing the switch to no schedule logic from blk_mq_init_sched. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20221030100714.876891-8-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -564,13 +564,6 @@ int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e)
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unsigned long i;
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int ret;
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if (!e) {
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blk_queue_flag_clear(QUEUE_FLAG_SQ_SCHED, q);
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q->elevator = NULL;
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q->nr_requests = q->tag_set->queue_depth;
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return 0;
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}
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/*
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* Default to double of smaller one between hw queue_depth and 128,
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* since we don't split into sync/async like the old code did.
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@ -4588,7 +4588,7 @@ static bool blk_mq_elv_switch_none(struct list_head *head,
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__elevator_get(qe->type);
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qe->type = q->elevator->type;
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list_add(&qe->node, head);
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elevator_switch(q, NULL);
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elevator_disable(q);
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mutex_unlock(&q->sysfs_lock);
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return true;
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@ -278,6 +278,7 @@ bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
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void blk_insert_flush(struct request *rq);
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int elevator_switch(struct request_queue *q, struct elevator_type *new_e);
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void elevator_disable(struct request_queue *q);
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void elevator_exit(struct request_queue *q);
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int elv_register_queue(struct request_queue *q, bool uevent);
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void elv_unregister_queue(struct request_queue *q);
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@ -554,39 +554,6 @@ void elv_unregister(struct elevator_type *e)
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}
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EXPORT_SYMBOL_GPL(elv_unregister);
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static int elevator_switch_mq(struct request_queue *q,
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struct elevator_type *new_e)
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{
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int ret;
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lockdep_assert_held(&q->sysfs_lock);
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if (q->elevator) {
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elv_unregister_queue(q);
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elevator_exit(q);
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}
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ret = blk_mq_init_sched(q, new_e);
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if (ret)
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goto out;
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if (new_e) {
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ret = elv_register_queue(q, true);
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if (ret) {
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elevator_exit(q);
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goto out;
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}
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}
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if (new_e)
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blk_add_trace_msg(q, "elv switch: %s", new_e->elevator_name);
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else
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blk_add_trace_msg(q, "elv switch: none");
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out:
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return ret;
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}
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static inline bool elv_support_iosched(struct request_queue *q)
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{
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if (!queue_is_mq(q) ||
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@ -691,19 +658,51 @@ void elevator_init_mq(struct request_queue *q)
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*/
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int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
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{
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int err;
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int ret;
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lockdep_assert_held(&q->sysfs_lock);
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blk_mq_freeze_queue(q);
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blk_mq_quiesce_queue(q);
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err = elevator_switch_mq(q, new_e);
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if (q->elevator) {
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elv_unregister_queue(q);
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elevator_exit(q);
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}
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ret = blk_mq_init_sched(q, new_e);
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if (ret)
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goto out_unfreeze;
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ret = elv_register_queue(q, true);
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if (ret) {
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elevator_exit(q);
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goto out_unfreeze;
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}
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blk_add_trace_msg(q, "elv switch: %s", new_e->elevator_name);
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out_unfreeze:
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blk_mq_unquiesce_queue(q);
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blk_mq_unfreeze_queue(q);
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return ret;
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}
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void elevator_disable(struct request_queue *q)
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{
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lockdep_assert_held(&q->sysfs_lock);
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blk_mq_freeze_queue(q);
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blk_mq_quiesce_queue(q);
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elv_unregister_queue(q);
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elevator_exit(q);
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blk_queue_flag_clear(QUEUE_FLAG_SQ_SCHED, q);
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q->elevator = NULL;
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q->nr_requests = q->tag_set->queue_depth;
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blk_add_trace_msg(q, "elv switch: none");
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blk_mq_unquiesce_queue(q);
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blk_mq_unfreeze_queue(q);
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return err;
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}
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/*
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@ -722,9 +721,9 @@ static int elevator_change(struct request_queue *q, const char *elevator_name)
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* Special case for mq, turn off scheduling
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*/
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if (!strncmp(elevator_name, "none", 4)) {
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if (!q->elevator)
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return 0;
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return elevator_switch(q, NULL);
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if (q->elevator)
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elevator_disable(q);
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return 0;
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}
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if (q->elevator && elevator_match(q->elevator->type, elevator_name))
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