From: Xu Rao 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: 9e4f11c1228c ("Documentation: Document the new zoned loop block device driver") Suggested-by: Damien Le Moal Signed-off-by: Xu Rao --- Changes in v2: - Replace the code change with a documentation correction. - State that a smaller last zone is unsupported and that an unaligned capacity is rounded down. Documentation/admin-guide/blockdev/zoned_loop.rst | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/blockdev/zoned_loop.rst b/Documentation/admin-guide/blockdev/zoned_loop.rst index f4f1f31..fd99e5c 100644 --- a/Documentation/admin-guide/blockdev/zoned_loop.rst +++ b/Documentation/admin-guide/blockdev/zoned_loop.rst @@ -71,8 +71,9 @@ 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 an unaligned value is rounded down to a + zone-size multiple. 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 -- 2.47.3