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    Subject[PATCH v11 08/13] dm-zoned: ensure only power of 2 zone sizes are allowed
    Date
    From: Luis Chamberlain <mcgrof@kernel.org>

    dm-zoned relies on the assumption that the zone size is a
    power-of-2(po2) and the zone capacity is same as the zone size.

    Ensure only po2 devices can be used as dm-zoned target until a native
    support for zoned devices with non-po2 zone size is added.

    Reviewed-by: Hannes Reinecke <hare@suse.de>
    Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
    Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
    Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
    ---
    drivers/md/dm-zoned-target.c | 8 ++++++++
    1 file changed, 8 insertions(+)

    diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
    index 95b132b52f33..9325bf5dee81 100644
    --- a/drivers/md/dm-zoned-target.c
    +++ b/drivers/md/dm-zoned-target.c
    @@ -792,6 +792,10 @@ static int dmz_fixup_devices(struct dm_target *ti)
    return -EINVAL;
    }
    zone_nr_sectors = bdev_zone_sectors(bdev);
    + if (!is_power_of_2(zone_nr_sectors)) {
    + ti->error = "Zone size is not a power-of-2 number of sectors";
    + return -EINVAL;
    + }
    zoned_dev->zone_nr_sectors = zone_nr_sectors;
    zoned_dev->nr_zones = bdev_nr_zones(bdev);
    }
    @@ -804,6 +808,10 @@ static int dmz_fixup_devices(struct dm_target *ti)
    return -EINVAL;
    }
    zoned_dev->zone_nr_sectors = bdev_zone_sectors(bdev);
    + if (!is_power_of_2(zoned_dev->zone_nr_sectors)) {
    + ti->error = "Zone size is not a power-of-2 number of sectors";
    + return -EINVAL;
    + }
    zoned_dev->nr_zones = bdev_nr_zones(bdev);
    }

    --
    2.25.1
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