From: Luis Chamberlain <mcgrof@xxxxxxxxxx> Today dm-zoned relies on the assumption that you have a zone size with a power of 2. Even though the block layer today enforces this requirement, these devices do exist and so provide a stop-gap measure to ensure these devices cannot be used by mistake Reviewed-by: Hannes Reinecke <hare@xxxxxxx> Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx> Signed-off-by: Pankaj Raghav <p.raghav@xxxxxxxxxxx> --- 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 0ec5d8b9b..ad4228db5 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 = blk_queue_zone_sectors(q); + if (!is_power_of_2(zone_nr_sectors)) { + ti->error = "Zone size not power of 2"; + return -EINVAL; + } zoned_dev->zone_nr_sectors = zone_nr_sectors; zoned_dev->nr_zones = blkdev_nr_zones(zoned_dev->bdev->bd_disk); @@ -806,6 +810,10 @@ static int dmz_fixup_devices(struct dm_target *ti) q = bdev_get_queue(zoned_dev->bdev); zoned_dev->zone_nr_sectors = blk_queue_zone_sectors(q); zoned_dev->nr_zones = blkdev_nr_zones(zoned_dev->bdev->bd_disk); + if (!is_power_of_2(zoned_dev->zone_nr_sectors)) { + ti->error = "Zone size not power of 2"; + return -EINVAL; + } } if (reg_dev) { -- 2.25.1 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel