[PATCHv2 7/9] generic/620: Use _mkfs_dev_blocksized to use 4k bs

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