ext4 with 64k blocksize (passed by user config) fails with below error for
this given test which requires dmhugedisk. Since this test anyways only
requires 4k bs, so use _mkfs_dev_blocksized() to fix this.

<error log with 64k bs>
mkfs.ext4: Input/output error while writing out and closing file system

Signed-off-by: Ritesh Harjani <redacted>
---
 tests/generic/620 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/generic/620 b/tests/generic/620
index b052376f..444e682d 100755
--- a/tests/generic/620
+++ b/tests/generic/620

@@ -42,7 +42,9 @@ sectors=$((2*1024*1024*1024*17))
 chunk_size=128
 
 _dmhugedisk_init $sectors $chunk_size
-_mkfs_dev $DMHUGEDISK_DEV
+
+# Use 4k blocksize.
+_mkfs_dev_blocksized 4096 $DMHUGEDISK_DEV
 _mount $DMHUGEDISK_DEV $SCRATCH_MNT || _fail "mount failed for $DMHUGEDISK_DEV $SCRATCH_MNT"
 testfile=$SCRATCH_MNT/testfile-$seq
 

-- 
2.31.1