[PATCH 4/4] generic/475: skip test when using an external log device

["Theodore Ts'o" <tytso@mit.edu>]

This test tests log recovery by kicking off fstress on the scratch fs,
then switching out the underlying the device with dm-error to see what
happens when the disk goes down.  But when there is an external log
device writes to the log device still succeed, while writes to the
rest of the file system fail, and this leads to file system
corruption.  So skip this test when there is an external log.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 tests/generic/475 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/generic/475 b/tests/generic/475
index c426402e..43c26303 100755
--- a/tests/generic/475
+++ b/tests/generic/475
@@ -34,6 +34,10 @@ _require_scratch
 _require_dm_target error
 _require_command "$KILLALL_PROG" "killall"
 
+if test "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ; then
+    _notrun "Cannot have external log device"
+fi
+
 echo "Silence is golden."
 
 _scratch_mkfs >> $seqres.full 2>&1
-- 
2.31.0