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Documentation: block: zloop: clarify capacity alignment

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zloop divides the requested capacity by the zone size to determine the
number of zones. Since it uses one zone size for all zones, a smaller last
zone is not supported and an unaligned capacity is rounded down.

The capacity_mb description incorrectly states that the capacity is rounded
up. Correct it to document the actual behavior.

Fixes: 9e4f11c122 ("Documentation: Document the new zoned loop block device driver")
Suggested-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Xu Rao <raoxu@uniontech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/4659F8F0C6C328EA+20260804052942.1186727-1-raoxu@uniontech.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Xu Rao
2026-08-04 13:29:41 +08:00
committed by Jens Axboe
parent af0955c8f2
commit d73b5b0690
1 changed files with 4 additions and 2 deletions
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6
Documentation/admin-guide/blockdev/zoned_loop.rst
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@@ -70,8 +70,10 @@ follows.
=================== =========================================================
id Device number (the X in /dev/zloopX).
Default: automatically assigned.
capacity_mb Device total capacity in MiB. This is always rounded up
to the nearest higher multiple of the zone size.
capacity_mb Device total capacity in MiB. A smaller last zone is not
supported, so a capacity value that is not a multiple of
the zone size is rounded down to the closest multiple of
the zone size.
Default: 16384 MiB (16 GiB).
zone_size_mb Device zone size in MiB. Default: 256 MiB.
zone_capacity_mb Device zone capacity (must always be equal to or lower