[PATCH] generic: check whether we can truncate heavily reflinked file

[Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>]

Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
---
 tests/generic/377     | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/generic/377.out |  2 ++
 tests/generic/group   |  1 +
 3 files changed, 77 insertions(+)
 create mode 100755 tests/generic/377
 create mode 100644 tests/generic/377.out

diff --git a/tests/generic/377 b/tests/generic/377
new file mode 100755
index 0000000..3a0c27e
--- /dev/null
+++ b/tests/generic/377
@@ -0,0 +1,74 @@
+#! /bin/bash
+# FS QA Test 377
+#
+# Create a heavily reflinked file, then check whether we can truncate
+# it correctly.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2016 Fujitsu.  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
+. ./common/reflink
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os Linux
+_require_scratch
+_require_scratch_reflink
+_require_cp_reflink
+
+_scratch_mkfs_sized $((128 * 1024 * 1024)) >> $seqres.full 2>&1
+_scratch_mount
+
+file=$SCRATCH_MNT/testfile
+blocksize=$((128 * 1024))
+
+# create the initial file.
+_pwrite_byte 0xcdcdcdcd 0 $blocksize  $file > /dev/null
+
+echo "Silence is golden"
+# filesize is 20GB, and here 20GB is choosen deliberately, so it
+# can consume enough fs free space.
+for ((i=1; i<163840; i++)); do
+	_reflink_range $file 0 $file $(($i * $blocksize)) $blocksize \
+		>> $seqres.full 2>&1
+done
+$XFS_IO_PROG -f -c 'truncate 0' $file
+
+status=0
+exit
diff --git a/tests/generic/377.out b/tests/generic/377.out
new file mode 100644
index 0000000..d14a512
--- /dev/null
+++ b/tests/generic/377.out
@@ -0,0 +1,2 @@
+QA output created by 377
+Silence is golden
diff --git a/tests/generic/group b/tests/generic/group
index bad71bc..ea98752 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -379,3 +379,4 @@
 374 auto quick clone dedupe
 375 auto quick acl
 376 auto quick metadata
+377 auto clone
-- 
2.9.0