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>

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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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9

block/bio.c

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4

block/fops.c

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5

include/linux/blkdev.h

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