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block: introduce max_write_streams queue limit

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Drivers with hardware that support write streams need a way to export how
many are available so applications can generically query this.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Nitesh Shetty <nj.shetty@samsung.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
[hch: renamed hints to streams, removed stacking]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Link: https://lore.kernel.org/r/20250506121732.8211-4-joshi.k@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch
2025-05-06 17:47:24 +05:30
committed by Jens Axboe
parent 5006f85ea2
commit d2f526ba27
3 changed files with 19 additions and 0 deletions
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7
Documentation/ABI/stable/sysfs-block
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@@ -547,6 +547,13 @@ Description:
[RO] Maximum size in bytes of a single element in a DMA
scatter/gather list.
What: /sys/block/<disk>/queue/max_write_streams
Date: November 2024
Contact: linux-block@vger.kernel.org
Description:
[RO] Maximum number of write streams supported, 0 if not
supported. If supported, valid values are 1 through
max_write_streams, inclusive.
What: /sys/block/<disk>/queue/max_segments
Date: March 2010