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[PATCHv6,09/11] block: introduce bdev_iter_is_aligned helper

Message ID 20220610195830.3574005-10-kbusch@fb.com (mailing list archive)
State New, archived
Headers show
Series direct-io dma alignment | expand

Commit Message

Keith Busch June 10, 2022, 7:58 p.m. UTC 
From: Keith Busch <kbusch@kernel.org>

Provide a convenient function for this repeatable coding pattern.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/blkdev.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ab7e6aa17954..fb5c177708d5 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1371,6 +1371,13 @@  static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
 	return queue_dma_alignment(bdev_get_queue(bdev));
 }
 
+static inline bool bdev_iter_is_aligned(struct block_device *bdev,
+					struct iov_iter *iter)
+{
+	return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
+				   bdev_logical_block_size(bdev) - 1);
+}
+
 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
 				 unsigned int len)
 {