[PATCH] xfstests: avoid ext4/306 failures caused by incompatible mount options

[Eric Whitney <enwlinux@xxxxxxxxx>]

ext4/306 will fail when mounting the ext3 file system it creates if an
ext3-incompatible mount option is applied by _scratch_mount.  This can
happen if EXT_MOUNT_OPTIONS is defined appropriately in the test
environment.  For example, the block_validity option is commonly used
to enhance ext4 testing, and it is not supported by ext3.  Fix this by
not including any mount options defined by the test environment.

Signed-off-by: Eric Whitney <enwlinux@xxxxxxxxx>
---
 tests/ext4/306 | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tests/ext4/306 b/tests/ext4/306
index 398c4c0..e59c8ed 100755
--- a/tests/ext4/306
+++ b/tests/ext4/306
@@ -52,9 +52,10 @@ grep -q ext3 /proc/filesystems || _notrun "This test 
requires ext3 support"
 
 rm -f $seqres.full
 
-# Make a small ext3 fs, (extents disabled) & mount it
+# Make a small ext3 fs, (extents disabled)
 yes | mkfs.ext3 $SCRATCH_DEV 512m >> $seqres.full 2>&1
-_scratch_mount -t ext3 || _fail "couldn't mount fs as ext3"
+# Mount it without _scratch_mount to avoid any ext3-incompatible mount options
+_mount -t ext3 $SCRATCH_DEV $SCRATCH_MNT || _fail "couldn't mount fs as ext3"
 # Create a small non-extent-based file
 echo "Create 1m testfile1"
 $XFS_IO_PROG -f $SCRATCH_MNT/testfile1 -c "pwrite 0 1m" | _filter_xfs_io
-- 
1.8.3.2