[PATCH 3/5] block: add a queue_has_disk helper

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Add a helper to check if a gendisk is associated with a request_queue.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 include/linux/blkdev.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ac3642c88a4d..96f3d9617cd8 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -664,6 +664,7 @@ extern void blk_clear_pm_only(struct request_queue *q);
 	dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
 	(dir), (attrs))
 
+#define queue_has_disk(q)	((q)->kobj.parent != NULL)
 #define queue_to_disk(q)	(dev_to_disk(kobj_to_dev((q)->kobj.parent)))
 
 static inline bool queue_is_mq(struct request_queue *q)
-- 
2.30.2




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