new file mode 100755
@@ -0,0 +1,81 @@
+#! /bin/bash
+# FS QA Test 004
+#
+# Check that live filesystem survives blockdev pagecache truncation.
+# blkdev page cache can be truncated due to various reasons
+# 1)ioctl: BLKDISCARD
+# 2)blkdev: falloc{ FALLOC_FL_ZERO_RANGE, FALLOC_FL_PUNCH_HOLE }
+# 3)nbd: NBD_CLEAR_SOCK
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 Dmitry Monakhov <dmonakhov@openvz.org>
+# 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/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+ $UMOUNT_PROG $fs_mnt
+ _destroy_loop_device $loop_dev
+ cd /
+ rm -rf $TEST_DIR/$$
+ rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+_require_loop
+
+# create the fs image and mount point
+
+mkdir -p $TEST_DIR/$$ || _fail "Can not make test dir"
+fs_img=$TEST_DIR/$$/fs.img
+fs_mnt=$TEST_DIR/$$/mnt
+$XFS_IO_PROG -fc "truncate 1g" $fs_img >>$seqres.full 2>&1
+mkdir -p $fs_mnt
+loop_dev=$(_create_loop_device $fs_img)
+_mkfs_dev $loop_dev
+_mount $loop_dev $fs_mnt
+
+# Issue zeroout on block device, this act just a giant hammer for fs,
+# A lot of complains are expected, bug_on/panic is not.
+$XFS_IO_PROG -c "fzero -k 0 1G" -f $loop_dev >>$seqres.full 2>&1
+# Try IO on corrupted fs
+for ((i=0;i<1000;i++));do
+ $XFS_IO_PROG -fc "pwrite -S $i 0 16k" $fs_mnt/test-$i >>$seqres.full 2>&1
+done
+$XFS_IO_PROG -fc "fsync" $fs_mnt/test-0 >>$seqres.full 2>&1
+
+# success, all done
+echo "Silence is golden"
+status=0
+exit
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+QA output created by 004
+Silence is golden
@@ -6,3 +6,4 @@
001 rw blockdev
002 rw blockdev liotarget
003 rw blockdev liotarget integrity dangerous
+004 rw blockdev dangerous zero
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> --- tests/blockdev/004 | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++ tests/blockdev/004.out | 2 ++ tests/blockdev/group | 1 + 3 files changed, 84 insertions(+) create mode 100755 tests/blockdev/004 create mode 100644 tests/blockdev/004.out