From: Jan Kara <jack@suse.cz>
Date: Mon, 21 Jan 2019 12:02:03 +0000 (+0100)
Subject: loop: Add test for changing capacity when filesystem is mounted
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=a58b9745fa4604b6aa9c2694dd25ddb39f46d0d8;p=users%2Fsagi%2Fblktests.git

loop: Add test for changing capacity when filesystem is mounted

Add test for changing capacity of a loop device when a filesystem with
non-default block size is mounted on it. This is a regression test for
"blockdev: Fix livelocks on loop device".

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
[Omar: mount under $TMPDIR]
Signed-off-by: Omar Sandoval <osandov@fb.com>
---

diff --git a/tests/loop/007 b/tests/loop/007
new file mode 100755
index 0000000..861b6b3
--- /dev/null
+++ b/tests/loop/007
@@ -0,0 +1,39 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2019 Jan Kara
+#
+# Test loop device capacity change handling with filesystem mounted on top.
+#
+# Regression test for commit 04906b2f542c "blockdev: Fix livelocks on loop
+# device".
+#
+
+. tests/loop/rc
+
+DESCRIPTION="update loop device capacity with filesystem"
+QUICK=1
+
+requires() {
+	_have_program mkfs.ext4
+}
+
+test() {
+	echo "Running ${TEST_NAME}"
+
+	local mount_dir="$TMPDIR/mnt"
+
+	truncate -s 1G "$TMPDIR/img"
+	mkdir -p "$mount_dir"
+	local loop_device
+	loop_device="$(losetup -P -f --show "$TMPDIR/img")"
+	mkfs.ext4 -b 1024 "$loop_device" &>/dev/null
+	mount -t ext4 "$loop_device" "$mount_dir"
+	losetup -c "$loop_device"
+	# This hangs if rereading capacity changed block size
+	ls -l "$mount_dir" >/dev/null
+	umount "$mount_dir"
+	losetup -d "$loop_device"
+	rm -fr "$mount_dir" "$TMPDIR/img"
+
+	echo "Test complete"
+}
diff --git a/tests/loop/007.out b/tests/loop/007.out
new file mode 100644
index 0000000..3275293
--- /dev/null
+++ b/tests/loop/007.out
@@ -0,0 +1,2 @@
+Running loop/007
+Test complete