null_blk: remove legacy IO path
We're planning on removing this code completely, kill the old path. Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
parent
4e6da0fe80
commit
e50b1e327a
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@ -616,10 +616,6 @@ static void end_cmd(struct nullb_cmd *cmd)
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case NULL_Q_MQ:
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blk_mq_end_request(cmd->rq, cmd->error);
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return;
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case NULL_Q_RQ:
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INIT_LIST_HEAD(&cmd->rq->queuelist);
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blk_end_request_all(cmd->rq, cmd->error);
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break;
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case NULL_Q_BIO:
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cmd->bio->bi_status = cmd->error;
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bio_endio(cmd->bio);
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@ -627,15 +623,6 @@ static void end_cmd(struct nullb_cmd *cmd)
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}
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free_cmd(cmd);
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/* Restart queue if needed, as we are freeing a tag */
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if (queue_mode == NULL_Q_RQ && blk_queue_stopped(q)) {
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unsigned long flags;
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spin_lock_irqsave(q->queue_lock, flags);
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blk_start_queue_async(q);
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spin_unlock_irqrestore(q->queue_lock, flags);
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}
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}
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static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer)
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@ -1136,25 +1123,14 @@ static void null_stop_queue(struct nullb *nullb)
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if (nullb->dev->queue_mode == NULL_Q_MQ)
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blk_mq_stop_hw_queues(q);
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else {
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spin_lock_irq(q->queue_lock);
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blk_stop_queue(q);
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spin_unlock_irq(q->queue_lock);
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}
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}
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static void null_restart_queue_async(struct nullb *nullb)
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{
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struct request_queue *q = nullb->q;
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unsigned long flags;
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if (nullb->dev->queue_mode == NULL_Q_MQ)
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blk_mq_start_stopped_hw_queues(q, true);
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else {
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spin_lock_irqsave(q->queue_lock, flags);
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blk_start_queue_async(q);
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spin_unlock_irqrestore(q->queue_lock, flags);
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}
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}
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static bool cmd_report_zone(struct nullb *nullb, struct nullb_cmd *cmd)
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@ -1197,15 +1173,6 @@ static blk_status_t null_handle_cmd(struct nullb_cmd *cmd)
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/* race with timer */
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if (atomic_long_read(&nullb->cur_bytes) > 0)
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null_restart_queue_async(nullb);
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if (dev->queue_mode == NULL_Q_RQ) {
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struct request_queue *q = nullb->q;
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spin_lock_irq(q->queue_lock);
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rq->rq_flags |= RQF_DONTPREP;
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blk_requeue_request(q, rq);
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spin_unlock_irq(q->queue_lock);
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return BLK_STS_OK;
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} else
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/* requeue request */
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return BLK_STS_DEV_RESOURCE;
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}
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@ -1278,9 +1245,6 @@ static blk_status_t null_handle_cmd(struct nullb_cmd *cmd)
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case NULL_Q_MQ:
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blk_mq_complete_request(cmd->rq);
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break;
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case NULL_Q_RQ:
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blk_complete_request(cmd->rq);
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break;
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case NULL_Q_BIO:
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/*
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* XXX: no proper submitting cpu information available.
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@ -1349,30 +1313,6 @@ static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio)
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return BLK_QC_T_NONE;
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}
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static enum blk_eh_timer_return null_rq_timed_out_fn(struct request *rq)
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{
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pr_info("null: rq %p timed out\n", rq);
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__blk_complete_request(rq);
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return BLK_EH_DONE;
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}
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static int null_rq_prep_fn(struct request_queue *q, struct request *req)
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{
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struct nullb *nullb = q->queuedata;
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struct nullb_queue *nq = nullb_to_queue(nullb);
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struct nullb_cmd *cmd;
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cmd = alloc_cmd(nq, 0);
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if (cmd) {
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cmd->rq = req;
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req->special = cmd;
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return BLKPREP_OK;
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}
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blk_stop_queue(q);
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return BLKPREP_DEFER;
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}
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static bool should_timeout_request(struct request *rq)
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{
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#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION
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@ -1391,27 +1331,6 @@ static bool should_requeue_request(struct request *rq)
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return false;
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}
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static void null_request_fn(struct request_queue *q)
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{
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struct request *rq;
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while ((rq = blk_fetch_request(q)) != NULL) {
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struct nullb_cmd *cmd = rq->special;
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/* just ignore the request */
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if (should_timeout_request(rq))
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continue;
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if (should_requeue_request(rq)) {
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blk_requeue_request(q, rq);
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continue;
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}
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spin_unlock_irq(q->queue_lock);
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null_handle_cmd(cmd);
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spin_lock_irq(q->queue_lock);
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}
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}
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static enum blk_eh_timer_return null_timeout_rq(struct request *rq, bool res)
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{
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pr_info("null: rq %p timed out\n", rq);
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@ -1766,24 +1685,6 @@ static int null_add_dev(struct nullb_device *dev)
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rv = init_driver_queues(nullb);
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if (rv)
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goto out_cleanup_blk_queue;
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} else {
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nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock,
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dev->home_node);
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if (!nullb->q) {
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rv = -ENOMEM;
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goto out_cleanup_queues;
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}
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if (!null_setup_fault())
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goto out_cleanup_blk_queue;
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blk_queue_prep_rq(nullb->q, null_rq_prep_fn);
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blk_queue_softirq_done(nullb->q, null_softirq_done_fn);
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blk_queue_rq_timed_out(nullb->q, null_rq_timed_out_fn);
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nullb->q->rq_timeout = 5 * HZ;
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rv = init_driver_queues(nullb);
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if (rv)
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goto out_cleanup_blk_queue;
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}
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if (dev->mbps) {
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@ -1865,6 +1766,10 @@ static int __init null_init(void)
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return -EINVAL;
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}
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if (g_queue_mode == NULL_Q_RQ) {
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pr_err("null_blk: legacy IO path no longer available\n");
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return -EINVAL;
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}
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if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) {
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if (g_submit_queues != nr_online_nodes) {
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pr_warn("null_blk: submit_queues param is set to %u.\n",
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