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| author | Keith Busch <kbusch@kernel.org> | 2022-06-10 12:58:22 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-06-27 06:29:11 -0600 |
| commit | 3850e13f2853a17c083eb00fad2c6da4fde0b41e (patch) | |
| tree | cdc879bb778abecd354f9a36798c026a4347031f /Documentation/ABI/stable | |
| parent | c58c0074c54c2e2bb3bb0d5a4d8896bb660cc8bc (diff) | |
| download | linux-3850e13f2853a17c083eb00fad2c6da4fde0b41e.tar.gz linux-3850e13f2853a17c083eb00fad2c6da4fde0b41e.tar.bz2 linux-3850e13f2853a17c083eb00fad2c6da4fde0b41e.zip | |
block: export dma_alignment attribute
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>
Diffstat (limited to 'Documentation/ABI/stable')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-block | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index e8797cd09aff..cd14ecb3c9a5 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -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 |