[PATCH] common/rc: don't clear superblock for zoned scratch pools

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_require_scratch_dev_pool() zeros the first 100 sectors of each device to
clear eventual remains of older filesystems.

On zoned devices this creates all sorts of problems, so just skip the
clearing there.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
 common/rc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/common/rc b/common/rc
index 654730b21ead..d763501be2b2 100644
--- a/common/rc
+++ b/common/rc
@@ -3461,7 +3461,9 @@ _require_scratch_dev_pool()
 		# to help better debug when something fails, we remove
 		# traces of previous btrfs FS on the dev.
-		dd if=/dev/zero of=$i bs=4096 count=100 > /dev/null 2>&1
+		if [ "`_zone_type "$i"`" = "none" ]; then
+			dd if=/dev/zero of=$i bs=4096 count=100 > /dev/null 2>&1
+		fi

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