loop: set dma_alignment from the backing file for direct I/O

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Direct I/O user pages are forwarded to the backing file unchanged, so
the backing's DMA alignment requirement applies to them. Track the
backing's dio_mem_align and advertise it as the loop device's
dma_alignment so we advertise proper limits and misaligned I/O is
rejected here instead of being dispatched to the backend.

Reviewed-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://patch.msgid.link/20260720201057.1862857-4-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Keith Busch 2026-07-20 13:10:55 -07:00 • committed by Jens Axboe

parent 702a2a9f3d

commit 6c8dec275c

1 changed files with 38 additions and 8 deletions

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drivers/block/loop.c

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