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Commit 8ef1a191 authored by Bart Van Assche's avatar Bart Van Assche Committed by Jens Axboe
Browse files

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: default avatarBart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Reviewed-by: default avatarMing Lei <ming.lei@redhat.com>
Reviewed-by: default avatarEduardo Valentin <eduval@amazon.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Omar Sandoval <osandov@fb.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent c0cb1c6d

block/blk-mq-debugfs.c

+32 −0
Original line number Diff line number Diff line
@@ -308,6 +308,37 @@ int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) 
}

EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);



static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)

	__acquires(&q->requeue_lock)

{

	struct request_queue *q = m->private;



	spin_lock_irq(&q->requeue_lock);

	return seq_list_start(&q->requeue_list, *pos);

}



static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)

{

	struct request_queue *q = m->private;



	return seq_list_next(v, &q->requeue_list, pos);

}



static void queue_requeue_list_stop(struct seq_file *m, void *v)

	__releases(&q->requeue_lock)

{

	struct request_queue *q = m->private;



	spin_unlock_irq(&q->requeue_lock);

}



static const struct seq_operations queue_requeue_list_seq_ops = {

	.start	= queue_requeue_list_start,

	.next	= queue_requeue_list_next,

	.stop	= queue_requeue_list_stop,

	.show	= blk_mq_debugfs_rq_show,

};



static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)

	__acquires(&hctx->lock)

{
@@ -665,6 +696,7 @@ const struct file_operations blk_mq_debugfs_fops = { 


static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {

	{"poll_stat", 0400, queue_poll_stat_show},

	{"requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops},

	{"state", 0600, queue_state_show, queue_state_write},

	{},

};