xfs/098: fix xfs_repair on newer xfsprogs

1) use _repair_scratch_fs instead of xfs_repair
   The obsolete xfs_repair always cleared the log regardless of
   whether it is corrupted and current xfs_repair only cleared the
   log when -L option is specified.  xfs_repair -L option should be
   used to clear it if xfs_repair failed to clear log.
2) catch non-zero return value instead of 2
   It can be applied to both the old return value 1 and the new
   return value 2
3) add filter_xfs_dmesg to ignore mount related warnings
   If we corrupt log and mount on a CONFIG_XFS_WARN build, there
   will be mount related warnings in dmesg as expected.

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

common/rc

@@ -1152,7 +1152,7 @@ _repair_scratch_fs()
     xfs)
         _scratch_xfs_repair "$@" 2>&1
 	res=$?
-	if [ "$res" -eq 2 ]; then
+	if [ "$res" -ne 0 ]; then
 		echo "xfs_repair returns $res; replay log?"
 		_scratch_mount
 		res=$?

tests/xfs/098

@@ -54,6 +54,17 @@ _require_xfs_db_blocktrash_z_command
 test -z "${FUZZ_ARGS}" && FUZZ_ARGS="-n 8 -3"
 
 rm -f $seqres.full
+
+# If we corrupt log on a CONFIG_XFS_WARN build, there will be mount related
+# WARNINGs in dmesg as expected.  We don't want to simply _disable_dmesg_check
+# which could miss other potential bugs, so filter out the intentional WARNINGs,
+# make sure test doesn't fail because of this warning and fails on other WARNINGs.
+filter_xfs_dmesg()
+{
+	local warn="WARNING:.*fs/xfs/xfs_message\.c:.*asswarn.*"
+	sed -e "s#$warn#Intentional warnings in asswarn#"
+}
+
 TESTDIR="${SCRATCH_MNT}/scratchdir"
 TESTFILE="${TESTDIR}/testfile"
 
@@ -93,7 +104,10 @@ echo "+ mount image"
 _scratch_mount 2>/dev/null && _fail "mount should not succeed"
 
 echo "+ repair fs"
-_scratch_xfs_repair >> $seqres.full 2>&1
+_repair_scratch_fs >> $seqres.full 2>&1
+
+# mount may trigger related WARNINGs, so filter them.
+_check_dmesg filter_xfs_dmesg
 
 echo "+ mount image (2)"
 _scratch_mount