From: Luis Chamberlain <[email protected]>
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 <[email protected]>
Signed-off-by: Luis Chamberlain <[email protected]>
Signed-off-by: Pankaj Raghav <[email protected]>
---
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