generic: test negative SEEK_HOLE/SEEK_DATA offsets

Check that we get -ENXIO if the user calls SEEK_HOLE/SEEK_DATA with
a negative file offset.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/generic/448

@@ -0,0 +1,64 @@
+#! /bin/bash
+# FS QA Test No. 448
+#
+# Check what happens when SEEK_HOLE/SEEK_DATA are fed negative offsets.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017, Oracle and/or its affiliates.  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()
+{
+	rm -f $tmp.* $BASE_TEST_FILE.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+_supported_fs generic
+_supported_os Linux
+
+_require_test
+_require_seek_data_hole
+
+BASE_TEST_FILE=$TEST_DIR/seek_sanity_testfile_$seq
+
+_require_test_program "seek_sanity_test"
+
+# Disable extent zeroing for ext4 as that change where holes are created
+if [ "$FSTYP" = "ext4" ]; then
+	DEV=`_short_dev $TEST_DEV`
+	echo 0 >/sys/fs/ext4/$DEV/extent_max_zeroout_kb
+fi
+
+$here/src/seek_sanity_test -s 18 -e 18 $BASE_TEST_FILE > $seqres.full 2>&1 ||
+	_fail "seek sanity check failed!"
+
+_check_dmesg
+# success, all done
+echo "Silence is golden"
+status=0
+exit

tests/generic/448.out

@@ -0,0 +1,2 @@
+QA output created by 448
+Silence is golden

tests/generic/group

@@ -450,3 +450,4 @@
 445 auto quick rw
 446 auto quick rw dangerous
 447 auto quick clone
+448 auto quick rw