[PATCH] btrfs: test unmount during quota rescan

[Justin Maggard <jmaggard10@gmail.com>]

This test case tests if we are able to unmount a filesystem while
a quota rescan is running.  Up to now (4.3-rc4) this would result
in a kernel NULL pointer dereference.

Signed-off-by: Justin Maggard <jmaggard@netgear.com>
---
 tests/btrfs/104     | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/btrfs/104.out |  1 +
 tests/btrfs/group   |  1 +
 3 files changed, 87 insertions(+)
 create mode 100755 tests/btrfs/104
 create mode 100644 tests/btrfs/104.out

diff --git a/tests/btrfs/104 b/tests/btrfs/104
new file mode 100755
index 0000000..7c51298
--- /dev/null
+++ b/tests/btrfs/104
@@ -0,0 +1,85 @@
+#! /bin/bash
+# FS QA Test No. btrfs/200
+#
+# btrfs quota scan/unmount sanity test
+#
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015 NETGEAR, Inc.  All Rights Reserved.
+#
+# 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.
+#
+# This program is distributed in the hope that it would 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, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+
+status=1	# failure is the default!
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+	$UMOUNT_PROG $loop_mnt >/dev/null 2>&1
+	_destroy_loop_device $loop_dev1
+	rm -rf $loop_mnt
+	rm -f $fs_img1
+}
+
+trap "_cleanup ; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs btrfs
+_supported_os Linux
+_require_test
+
+rm -f $seqres.full
+
+loop_mnt=$TEST_DIR/$seq.$$.mnt
+fs_img1=$TEST_DIR/$seq.$$.img1
+mkdir $loop_mnt
+$XFS_IO_PROG -f -c "truncate 1G" $fs_img1 >>$seqres.full 2>&1
+
+loop_dev1=`_create_loop_device $fs_img1`
+
+_mkfs_dev $loop_dev1 >>$seqres.full 2>&1
+_mount $loop_dev1 $loop_mnt
+for i in 0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p
+do
+  for j in 0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p
+  do
+    for k in 0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p
+    do
+      for l in 0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p
+      do
+	touch $loop_mnt/${i}${j}${k}${l}
+      done
+    done
+  done
+done >>$seqres.full 2>&1
+echo 3 > /proc/sys/vm/drop_caches
+$BTRFS_UTIL_PROG quota enable $loop_mnt
+$UMOUNT_PROG $loop_mnt
+
+status=0
+exit
diff --git a/tests/btrfs/104.out b/tests/btrfs/104.out
new file mode 100644
index 0000000..1ed84bc
--- /dev/null
+++ b/tests/btrfs/104.out
@@ -0,0 +1 @@
+QA output created by 104
diff --git a/tests/btrfs/group b/tests/btrfs/group
index e92a65a..6218adf 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -106,3 +106,4 @@
 101 auto quick replace
 102 auto quick metadata enospc
 103 auto quick clone compress
+104 auto qgroup
-- 
2.6.1