[PATCH 2/4] overlay: fix regression in _repair_overlay_scratch_fs

[Amir Goldstein <amir73il@gmail.com>]

_repair_overlay_scratch_fs assumed that the base fs is mounted.
This was a wrong assumption to make, and that was exposed by commit
4c6bc456 ("fstests: clean up mount and unmount operations") that
converted open coded umount in generic/332 to _scratch_unmount.

After this change, there errors were observed when running generic/332
if fsck.overlay is installed:

     Check for damage
    +fsck.overlay:[Error]: Faile to resolve upperdir:/vdf/ovl-upper:
                           No such file or directory
    +fsck.overlay failed, err=8
    +umount: /vdf: not mounted.

Fix this by making sure that base fs is mounted before running the
layers check and fix test generic/330 to conform with the umount
conversion patch.

Fixes: 4c6bc456 ("fstests: clean up mount and unmount operations")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 common/overlay    | 2 ++
 tests/generic/330 | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/common/overlay b/common/overlay
index 2e36fa3d..f05f8180 100644
--- a/common/overlay
+++ b/common/overlay
@@ -433,6 +433,8 @@ _check_overlay_scratch_fs()
 
 _repair_overlay_scratch_fs()
 {
+	# Base fs needs to be mounted for overlayfs check
+	_overlay_base_scratch_mount
 	_overlay_fsck_dirs $OVL_BASE_SCRATCH_MNT/$OVL_LOWER \
 		$OVL_BASE_SCRATCH_MNT/$OVL_UPPER \
 		$OVL_BASE_SCRATCH_MNT/$OVL_WORK -y
diff --git a/tests/generic/330 b/tests/generic/330
index c67defc4..901b17b1 100755
--- a/tests/generic/330
+++ b/tests/generic/330
@@ -61,7 +61,7 @@ md5sum $testdir/file1 | _filter_scratch
 md5sum $testdir/file2 | _filter_scratch
 
 echo "Check for damage"
-umount $SCRATCH_MNT
+_scratch_unmount
 _repair_scratch_fs >> $seqres.full
 
 # success, all done
-- 
2.34.1