[PATCH] generic/730: don't override $SCRATCH_DEV

generic/730 operates on a scsi_debug device, but overrides SCRATCH_DEV
to test for shutdown support.  Switch this to test the shutdown support
on the actual scratch device without overriding it, as shutdown support
should not depend on the actual device, and this ensures that options
that might not work on the scsi_debug device don't get applied to it.

Signed-off-by: Christoph Hellwig <[email protected]>
---
 tests/generic/730 | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/tests/generic/730 b/tests/generic/730
index 1798afb7deea..64d10bba73db 100755
--- a/tests/generic/730
+++ b/tests/generic/730
@@ -25,14 +25,17 @@ _cleanup()
 _require_test
 _require_block_device $TEST_DEV
 _require_scsi_debug
-# scsi_debug doesn't support DAX, so skip this test if MOUNT_OPTIONS
-# contains "dax"
-_exclude_scratch_mount_option "dax"
+
+# The actual test does not use the scratch device, but _require_scratch_shutdown
+# is the most sensible way to check that a file system supports shutdown.
+# Require scratch to use that check, but otherwise just use the scsi_debug
+# device.
+_require_scratch_nocheck
+_require_scratch_shutdown
 
 size=$(_small_fs_size_mb 256)
 SCSI_DEBUG_DEV=`_get_scsi_debug_dev 512 512 0 $size`
 test -b "$SCSI_DEBUG_DEV" || _notrun "Failed to initialize scsi debug device"
-SCRATCH_DEV=$SCSI_DEBUG_DEV _require_scratch_shutdown
 echo "SCSI debug device $SCSI_DEBUG_DEV" >>$seqres.full
 
 run_check _mkfs_dev $SCSI_DEBUG_DEV
-- 
2.53.0