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blk-mq-debugfs: Show requeue list
When verifying whether or not a blk-mq driver forgot to kick the requeue list after having requeued a request it is important to be able to verify the contents of the requeue list. Hence export that list through debugfs. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Eduardo Valentin <eduval@amazon.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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1 changed files with 32 additions and 0 deletions
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@ -308,6 +308,37 @@ int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
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}
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}
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EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
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EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
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static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
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__acquires(&q->requeue_lock)
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{
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struct request_queue *q = m->private;
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spin_lock_irq(&q->requeue_lock);
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return seq_list_start(&q->requeue_list, *pos);
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}
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static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
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{
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struct request_queue *q = m->private;
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return seq_list_next(v, &q->requeue_list, pos);
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}
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static void queue_requeue_list_stop(struct seq_file *m, void *v)
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__releases(&q->requeue_lock)
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{
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struct request_queue *q = m->private;
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spin_unlock_irq(&q->requeue_lock);
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}
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static const struct seq_operations queue_requeue_list_seq_ops = {
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.start = queue_requeue_list_start,
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.next = queue_requeue_list_next,
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.stop = queue_requeue_list_stop,
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.show = blk_mq_debugfs_rq_show,
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};
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static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
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static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
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__acquires(&hctx->lock)
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__acquires(&hctx->lock)
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{
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{
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@ -665,6 +696,7 @@ const struct file_operations blk_mq_debugfs_fops = {
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static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
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static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
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{"poll_stat", 0400, queue_poll_stat_show},
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{"poll_stat", 0400, queue_poll_stat_show},
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{"requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops},
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{"state", 0600, queue_state_show, queue_state_write},
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{"state", 0600, queue_state_show, queue_state_write},
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{},
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{},
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};
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};
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