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block: relax direct io memory alignment

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Use the address alignment requirements from the block_device for direct
io instead of requiring addresses be aligned to the block size. User
space can discover the alignment requirements from the dma_alignment
queue attribute.

User space can specify any hardware compatible DMA offset for each
segment, but every segment length is still required to be a multiple of
the block size.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220610195830.3574005-11-kbusch@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2022-06-10 12:58:29 -07:00 • committed by Jens Axboe
parent 5debd9691c
commit b1a000d3b8
3 changed files with 16 additions and 2 deletions
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5
include/linux/blkdev.h
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@ -424,6 +424,11 @@ struct request_queue {
unsigned long nr_requests; /* Max # of requests */
unsigned int dma_pad_mask;
/*
* Drivers that set dma_alignment to less than 511 must be prepared to
* handle individual bvec's that are not a multiple of a SECTOR_SIZE
* due to possible offsets.
*/
unsigned int dma_alignment;
#ifdef CONFIG_BLK_INLINE_ENCRYPTION