xfs: verify xfs_quota commands against invalid mount path

Introduce a new test to verify xfs_quota administrator commands can
deal with invalid XFS mount path properly without NULL pointer
dereference issue.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>

tests/xfs/303

@@ -0,0 +1,66 @@
+#! /bin/bash
+# FS QA Test No. 303
+#
+# Test to verify xfs_quota(8) administrator commands can deal with invalid
+# storage mount point without NULL pointer dereference problem.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2013 Oracle 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!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+    cd /
+    rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs xfs
+_supported_os IRIX Linux
+
+echo "Silence is golden"
+
+# To run this sanity check we don't need to enable quota function
+# nor need a scratch device as quota tool will get the mount path
+# at first.
+# An non-existent xfs mount point
+INVALID_PATH="/INVALID_XFS_MOUNT_POINT"
+
+xfs_quota -x -c 'report -a' $INVALID_PATH	2>/dev/null
+xfs_quota -x -c 'state -a' $INVALID_PATH	2>/dev/null
+xfs_quota -x -c 'free -h' $INVALID_PATH		2>/dev/null
+xfs_quota -x -c 'quot -v' $INVALID_PATH		2>/dev/null
+xfs_quota -x -c 'remove' $INALID_PATH		2>/dev/null
+xfs_quota -x -c 'disable' $INVALID_PATH		2>/dev/null
+xfs_quota -x -c 'enable' $INVALID_PATH		2>/dev/null
+
+# success, all done
+status=0
+exit

tests/xfs/303.out

@@ -0,0 +1,2 @@
+QA output created by 303
+Silence is golden

tests/xfs/group

@@ -182,3 +182,4 @@
 300 auto fsr
 301 auto dump
 302 auto dump
+303 auto quick quota