From aa833bdd8aa6a3e3557b19fa3877b0eee806df63 Mon Sep 17 00:00:00 2001
From: David Teigland <teigland@redhat.com>
Date: Mon, 9 Apr 2018 13:57:44 -0500
Subject: [PATCH] bcache: intercept test mode before write

Don't allow writes in test mode.  test mode should be
more sophisticated than just faking writes, and this
should be a last defense for cases where test mode is
not being checked correctly.
---
 lib/label/label.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/label/label.c b/lib/label/label.c
index c11a040a9..4b18f5682 100644
--- a/lib/label/label.c
+++ b/lib/label/label.c
@@ -922,6 +922,9 @@ bool dev_write_bytes(struct device *dev, off_t start, size_t len, void *data)
 {
 	int ret;
 
+	if (test_mode())
+		return true;
+
 	if (!scan_bcache) {
 		if (!dev_open(dev))
 			return false;
@@ -955,6 +958,9 @@ bool dev_write_zeros(struct device *dev, off_t start, size_t len)
 {
 	int ret;
 
+	if (test_mode())
+		return true;
+
 	if (!scan_bcache) {
 		if (!dev_open(dev))
 			return false;