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dm: fix native zone append devices on top of emulated ones

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If a DM device that can pass down zone append commands is stacked on top
of a device that emulates zone append commands, it will allocate zone
append emulation resources, even though it doesn't use them. This is
because the underlying device will have max_hw_zone_append_sectors set
to 0 to request zone append emulation. When the DM device is stacked on
top of it, it will inherit that max_hw_zone_append_sectors limit,
despite being able to pass down zone append bios. Solve this by making
sure max_hw_zone_append_sectors is non-zero for DM devices that do not
need zone append emulation.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Tested-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Benjamin Marzinski 2025-04-10 15:49:43 -04:00 committed by Mikulas Patocka
parent 121218bef4
commit ad320ae276
1 changed files with 5 additions and 1 deletions
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6
drivers/md/dm-zone.c
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@ -347,11 +347,15 @@ int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q,
/*
* Check if zone append is natively supported, and if not, set the
* mapped device queue as needing zone append emulation.
* mapped device queue as needing zone append emulation. If zone
* append is natively supported, make sure that
* max_hw_zone_append_sectors is not set to 0.
*/
WARN_ON_ONCE(queue_is_mq(q));
if (!dm_table_supports_zone_append(t))
lim->max_hw_zone_append_sectors = 0;
else if (lim->max_hw_zone_append_sectors == 0)
lim->max_hw_zone_append_sectors = lim->max_zone_append_sectors;
/*
* Determine the max open and max active zone limits for the mapped