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Subject[PATCH blktests] loop/002: Regression testing for loop device flush
Date
Add a regression testing for loop device. when an unbound device
be close that take too long time. kernel will consume serveral orders
of magnitude more wall time than it does for a mounted device.

Signed-off-by: James Wang <jnwang@suse.com>
---
tests/loop/002 | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
tests/loop/002.out | 2 ++
2 files changed, 79 insertions(+)

diff --git a/tests/loop/002 b/tests/loop/002
new file mode 100755
index 0000000..fd607d1
--- /dev/null
+++ b/tests/loop/002
@@ -0,0 +1,77 @@
+#!/bin/bash
+#
+# Test if close()ing a unbound loop device is too slow
+# Copyright (C) 2017 James Wang
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+DESCRIPTION="Test if close()ing a unbound loop device is too slow"
+
+QUICK=1
+
+function run_test() {
+ TIMEFORMAT='%5R'
+ time {
+ for f in `ls /dev/loop[0-9]*|sort`; do dd if=$f of=/dev/null bs=512 count=1 >/dev/null 2>&1; done
+ }
+}
+function clean_up() {
+ if lsmod | grep loop >/dev/null 2>&1; then
+ umount /dev/loop* >/dev/null 2>&1
+ losetup -D
+ sleep 5
+
+ if ! rmmod loop;then
+ return 2;
+ fi
+ fi
+}
+
+function prepare() {
+ modprobe loop max_loop=64
+ dd if=/dev/zero of=${TMPDIR}/disk bs=512 count=200K >/dev/null 2>&1
+ for((i=0;i<4;i++))
+ do
+ losetup -f ${TMPDIR}/disk;
+ done
+ mkfs.ext4 -F /dev/loop0 >/dev/null 2>&1
+ for((i=0;i<4;i++))
+ do
+ mkdir -p t$i;
+ mount /dev/loop$i t$i;
+ done
+
+}
+
+
+test() {
+ echo "Running ${TEST_NAME}"
+
+ prepare
+ SECONDS=0
+ run_test >/dev/null 2>&1
+ DURATION=${SECONDS}
+
+ clean_up
+ if ! clean_up; then
+ echo "Test complete"
+ return 2
+ fi
+ echo "Test complete"
+ if [[ "${DURATION}" -gt 1 ]]; then
+ return 1
+ else
+ return 0
+ fi
+}
diff --git a/tests/loop/002.out b/tests/loop/002.out
new file mode 100644
index 0000000..5c34a37
--- /dev/null
+++ b/tests/loop/002.out
@@ -0,0 +1,2 @@
+Running loop/002
+Test complete
--
2.12.3
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