[PATCH v2 3/6] generic/604: do not run with overlayfs

[Amir Goldstein <amir73il@gmail.com>]

Overlayfs does not allow mounting over again with the same layers
until umount is fully completed, so is not appropriate for this test
which tries to mount in parallel to umount.

This is manifested as the test failure below when overlayfs strict mount
checks are enabled by enabling the index feature:

$ echo Y > /sys/module/overlay/parameters/index
...
    +mount: /vdf/ovl-mnt: /vdf already mounted or mount point busy.
    +       dmesg(1) may have more information after failed mount system call.
    +mount /vdf /vdf/ovl-mnt failed

Opt-out of this test with overlayfs and remove the hacks that were placed
by commit 06cee932 ("generic/604: Fix for overlayfs") to make the test pass
with overlayfs in the first place.

Tested-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 tests/generic/604 | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tests/generic/604 b/tests/generic/604
index 744d3456..481250fd 100755
--- a/tests/generic/604
+++ b/tests/generic/604
@@ -13,6 +13,9 @@ _begin_fstest auto quick mount
 # Import common functions.
 . ./common/filter
 
+# Overlayfs does not allow mounting over again with the same layers
+# until umount is fully completed, so is not appropriate for this test.
+_exclude_fs overlay
 
 # Modify as appropriate.
 _require_scratch
@@ -22,11 +25,9 @@ _scratch_mount
 for i in $(seq 0 500); do
 	$XFS_IO_PROG -f -c "pwrite 0 4K" $SCRATCH_MNT/$i >/dev/null
 done
-# For overlayfs, avoid unmounting the base fs after _scratch_mount tries to
-# mount the base fs.  Delay the mount attempt by a small amount in the hope
-# that the mount() call will try to lock s_umount /after/ umount has already
-# taken it.
-_unmount $SCRATCH_MNT &
+# Delay the mount attempt by a small amount in the hope that the mount() call
+# will try to lock s_umount /after/ umount has already taken it.
+_scratch_unmount &
 sleep 0.01s ; _scratch_mount
 wait
 
-- 
2.34.1