reflink: high offset reflink and dedupe tests

Ensure that we can pass absurdly enormous offsets and lengths to
reflink/dedupe and it'll survive.

v2: Ask for dedupe in the dedupe test.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
[hch@lst.de: call _require_test_dedupe]
Signed-off-by: Christoph Hellwig <hch@lst.de>

tests/generic/303

@@ -0,0 +1,98 @@
+#! /bin/bash
+# FS QA Test No. 303
+#
+# Check that high-offset reflinks work.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2016, 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()
+{
+    cd /
+    rm -rf $tmp.* $testdir
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/attr
+. ./common/reflink
+
+# real QA test starts here
+_supported_os Linux
+_require_test_reflink
+_require_cp_reflink
+
+rm -f $seqres.full
+
+echo "Format and mount"
+testdir=$TEST_DIR/test-$seq
+mkdir $testdir
+
+echo "Create the original files"
+bigoff=9223372036854775806
+len=9223372036854775807
+bigoff_64k=9223372036854710272	# bigoff rounded down to 64k
+$XFS_IO_PROG -f -c "truncate $len" $testdir/file0 >> $seqres.full
+test -s $testdir/file0 || _notrun "High offset ftruncate failed"
+_pwrite_byte 0x61 $bigoff 1 $testdir/file1 >> $seqres.full
+_pwrite_byte 0x61 1048575 1 $testdir/file2 >> $seqres.full
+
+echo "Reflink large single byte file"
+_cp_reflink $testdir/file1 $testdir/file3 >> $seqres.full
+
+echo "Reflink large empty file"
+_cp_reflink $testdir/file0 $testdir/file4 >> $seqres.full
+
+echo "Reflink past maximum file size in dest file (should fail)"
+_reflink_range $testdir/file1 0 $testdir/file5 4611686018427322368 $len >> $seqres.full
+
+echo "Reflink high offset to low offset"
+_reflink_range $testdir/file1 $bigoff_64k $testdir/file6 1048576 65535 >> $seqres.full
+
+echo "Reflink past source file EOF (should fail)"
+_reflink_range $testdir/file2 524288 $testdir/file7 0 1048576 >> $seqres.full
+
+echo "Reflink max size at nonzero offset (should fail)"
+_reflink_range $testdir/file2 524288 $testdir/file8 0 $len >> $seqres.full
+
+echo "Reflink with huge off/len (should fail)"
+_reflink_range $testdir/file2 $bigoff_64k $testdir/file9 0 $bigoff_64k >> $seqres.full
+
+echo "Check file creation"
+_test_remount
+echo "file3"
+$XFS_IO_PROG -c "pread -v -q $bigoff 1" $testdir/file3
+echo "file4"
+$XFS_IO_PROG -c "pread -v -q $bigoff 1" $testdir/file4
+# file5 should fail above
+echo "file6"
+$XFS_IO_PROG -c "pread -v -q 1114110 1" $testdir/file6
+# file7 should fail above
+
+# success, all done
+status=0
+exit