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docs: sysfs-block: document virt_boundary_mask

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/sys/block/<disk>/queue/virt_boundary_mask is completely undocumented.
Document it.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20211209003833.6396-7-ebiggers@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Eric Biggers 2021-12-08 16:38:31 -08:00 committed by Jens Axboe
parent 1163010418
commit 8bc2f7c670
1 changed files with 12 additions and 0 deletions
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@ -544,6 +544,18 @@ Description:
CONFIG_BLK_DEV_THROTTLING_LOW is enabled.
What: /sys/block/<disk>/queue/virt_boundary_mask
Date: April 2021
Contact: linux-block@vger.kernel.org
Description:
[RO] This file shows the I/O segment memory alignment mask for
the block device. I/O requests to this device will be split
between segments wherever either the memory address of the end
of the previous segment or the memory address of the beginning
of the current segment is not aligned to virt_boundary_mask + 1
bytes.
What: /sys/block/<disk>/queue/wbt_lat_usec
Date: November 2016
Contact: linux-block@vger.kernel.org