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block: export dma_alignment attribute

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User space may want to know how to align their buffers to avoid
bouncing. Export the queue attribute.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220610195830.3574005-4-kbusch@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch
2022-06-10 12:58:22 -07:00
committed by Jens Axboe
parent c58c0074c5
commit 3850e13f28
2 changed files with 16 additions and 0 deletions
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9
Documentation/ABI/stable/sysfs-block
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@@ -260,6 +260,15 @@ Description:
for discards, and don't read this file.
What: /sys/block/<disk>/queue/dma_alignment
Date: May 2022
Contact: linux-block@vger.kernel.org
Description:
Reports the alignment that user space addresses must have to be
used for raw block device access with O_DIRECT and other driver
specific passthrough mechanisms.
What: /sys/block/<disk>/queue/fua
Date: May 2018
Contact: linux-block@vger.kernel.org