From df4a04484aeffa5e88488a42307af4d60a4f3e62 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.com>
Date: Mon, 4 Sep 2017 18:33:48 +0200
Subject: [PATCH] btrfs-progs: tests: missing device and slack space report

Verify that a missing device will not result in reporting a negative
value interpreted as 16EiB.

Signed-off-by: David Sterba <dsterba@suse.com>
---
 .../test.sh                                   | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100755 tests/misc-tests/023-device-usage-with-missing-device/test.sh

diff --git a/tests/misc-tests/023-device-usage-with-missing-device/test.sh b/tests/misc-tests/023-device-usage-with-missing-device/test.sh
new file mode 100755
index 00000000..3c8ba85c
--- /dev/null
+++ b/tests/misc-tests/023-device-usage-with-missing-device/test.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+# check if 'device slack' is reported as zero when a device is missing
+
+source "$TOP/tests/common"
+
+check_prereq btrfs-image
+check_prereq mkfs.btrfs
+check_prereq btrfs
+
+setup_root_helper
+
+test_run()
+{
+	# empty filesystem, with enough redundancy so degraded mount works
+	run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f -d raid1 -m raid1 $dev1 $dev2
+
+	TEST_DEV="$dev1"
+	run_check_mount_test_dev
+	run_check $SUDO_HELPER "$TOP/btrfs" filesystem usage "$TEST_MNT"
+	run_check_stdout $SUDO_HELPER "$TOP/btrfs" device usage "$TEST_MNT" | \
+		grep -q "slack.*16\\.00EiB" && _fail
+	run_check_umount_test_dev
+
+	run_mayfail wipefs -a $dev2
+	run_check $SUDO_HELPER losetup -d $dev2
+	unset loopdevs[2]
+
+	run_check_mount_test_dev -o degraded,ro
+	run_check $SUDO_HELPER "$TOP/btrfs" filesystem usage "$TEST_MNT"
+	run_check_stdout $SUDO_HELPER "$TOP/btrfs" device usage "$TEST_MNT" | \
+		grep -q "slack.*16\\.00EiB" && _fail
+	run_check_umount_test_dev
+}
+
+setup_loopdevs 2
+prepare_loopdevs
+dev1=${loopdevs[1]}
+dev2=${loopdevs[2]}
+test_run
+cleanup_loopdevs