diff mbox

[3/3] reflink: more tests

Message ID 20151208062904.21871.30589.stgit@birch.djwong.org (mailing list archive)
State Not Applicable
Headers show

Commit Message

Darrick J. Wong Dec. 8, 2015, 6:29 a.m. UTC 
Add more tests for unaligned copy-on-write things, and explicitly
test the ability to pass "len == 0" to mean reflink/dedupe all
the way to the end of the file".

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 tests/generic/820     |   77 ++++++++++++++++++++++++++++++++
 tests/generic/820.out |    8 +++
 tests/generic/847     |   96 ++++++++++++++++++++++++++++++++++++++++
 tests/generic/847.out |   11 +++++
 tests/generic/848     |   96 ++++++++++++++++++++++++++++++++++++++++
 tests/generic/848.out |   11 +++++
 tests/generic/849     |   80 ++++++++++++++++++++++++++++++++++
 tests/generic/849.out |    6 +++
 tests/generic/850     |  117 +++++++++++++++++++++++++++++++++++++++++++++++++
 tests/generic/850.out |   17 +++++++
 tests/generic/group   |    5 ++
 11 files changed, 524 insertions(+)
 create mode 100755 tests/generic/820
 create mode 100644 tests/generic/820.out
 create mode 100755 tests/generic/847
 create mode 100644 tests/generic/847.out
 create mode 100755 tests/generic/848
 create mode 100644 tests/generic/848.out
 create mode 100755 tests/generic/849
 create mode 100644 tests/generic/849.out
 create mode 100755 tests/generic/850
 create mode 100644 tests/generic/850.out



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Comments

Christoph Hellwig Dec. 10, 2015, 4:34 p.m. UTC | #1 
The new 849 fails reliably on btrfs, which makes me wonder if either
the test is doing something wrong, or the btrfs whole file clone
behavior is broken, which wouldn't be very reasuring.  I didn't have
time to look into why it's failing yet.
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Darrick J. Wong Dec. 10, 2015, 7:14 p.m. UTC | #2 
On Thu, Dec 10, 2015 at 08:34:49AM -0800, Christoph Hellwig wrote:
> The new 849 fails reliably on btrfs, which makes me wonder if either
> the test is doing something wrong, or the btrfs whole file clone
> behavior is broken, which wouldn't be very reasuring.  I didn't have
> time to look into why it's failing yet.

Huh.  Works reliably for /me; could you send me the output from 849?

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Christoph Hellwig Dec. 11, 2015, 12:07 a.m. UTC | #3 
On Thu, Dec 10, 2015 at 11:14:29AM -0800, Darrick J. Wong wrote:
> On Thu, Dec 10, 2015 at 08:34:49AM -0800, Christoph Hellwig wrote:
> > The new 849 fails reliably on btrfs, which makes me wonder if either
> > the test is doing something wrong, or the btrfs whole file clone
> > behavior is broken, which wouldn't be very reasuring.  I didn't have
> > time to look into why it's failing yet.
> 
> Huh.  Works reliably for /me; could you send me the output from 849?

--- tests/generic/849.out	2015-12-09 15:31:50.492879152 +0000
+++ /root/xfstests/results//generic/849.out.bad	2015-12-11
00:02:25.154347175 +0000
@@ -1,6 +1,7 @@
 QA output created by 849
 Create the original files
 f4820540fc0ac02750739896fe028d56  TEST_DIR/test-849/file1
-dc881c004745c49f7f4e9cc766f57bc8  TEST_DIR/test-849/file2
+eb34153e9ed1e774db28cbbe4090a449  TEST_DIR/test-849/file2
 dc881c004745c49f7f4e9cc766f57bc8  TEST_DIR/test-849/file2.chk
 Compare against check files
+file2 and file2.chk do not match
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diff mbox

Patch

diff --git a/tests/generic/820 b/tests/generic/820
new file mode 100755
index 0000000..e475f71
--- /dev/null
+++ b/tests/generic/820
@@ -0,0 +1,77 @@ 
+#! /bin/bash
+# FS QA Test No. 820
+#
+# Ensure that punch-hole doesn't clobber CoW.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015, 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/reflink
+
+# real QA test starts here
+_supported_os Linux
+_require_test_reflink
+_require_cp_reflink
+_require_xfs_io_command "fpunch"
+
+rm -f "$seqres.full"
+
+TESTDIR="$TEST_DIR/test-$seq"
+rm -rf "$TESTDIR"
+mkdir "$TESTDIR"
+
+echo "Create the original files"
+BLKSZ=65536
+NR=512
+_pwrite_byte 0x61 0 $((BLKSZ * NR)) "$TESTDIR/file1" >> "$seqres.full"
+
+_cp_reflink "$TESTDIR/file1" "$TESTDIR/file2"
+_test_remount
+
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+
+echo "Write and punch"
+_pwrite_byte 0x62 0 $((BLKSZ * 256)) "$TESTDIR/file2" >> "$seqres.full"
+"$XFS_IO_PROG" -f -c "fpunch $BLKSZ $((BLKSZ * 254))" "$TESTDIR/file2"
+_test_remount
+
+echo "Compare results"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/820.out b/tests/generic/820.out
new file mode 100644
index 0000000..527617d
--- /dev/null
+++ b/tests/generic/820.out
@@ -0,0 +1,8 @@ 
+QA output created by 820
+Create the original files
+bc3d7c2ff64219e33239f2e13c2d21db  TEST_DIR/test-820/file1
+bc3d7c2ff64219e33239f2e13c2d21db  TEST_DIR/test-820/file2
+Write and punch
+Compare results
+bc3d7c2ff64219e33239f2e13c2d21db  TEST_DIR/test-820/file1
+95cfd19ce56010430dc2057413d7efc5  TEST_DIR/test-820/file2
diff --git a/tests/generic/847 b/tests/generic/847
new file mode 100755
index 0000000..ee8b53b
--- /dev/null
+++ b/tests/generic/847
@@ -0,0 +1,96 @@ 
+#! /bin/bash
+# FS QA Test No. 847
+#
+# Ensure that unaligned punch-hole steps around reflinked ranges:
+#   - Create a reflink clone of a file
+#   - Perform an unaligned punch in the middle of the file.
+#   - Check that the reflinked areas are still there.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015, 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/reflink
+
+# real QA test starts here
+_supported_os Linux
+_require_test_reflink
+_require_cp_reflink
+_require_xfs_io_command "fpunch"
+
+rm -f "$seqres.full"
+
+TESTDIR="$TEST_DIR/test-$seq"
+rm -rf "$TESTDIR"
+mkdir "$TESTDIR"
+
+echo "Create the original files"
+BLKSZ=65536
+_pwrite_byte 0x61 0 $((BLKSZ * 3)) "$TESTDIR/file1" >> "$seqres.full"
+
+_cp_reflink "$TESTDIR/file1" "$TESTDIR/file2"
+
+_pwrite_byte 0x61 0 $((BLKSZ * 3)) "$TESTDIR/file2.chk" >> "$seqres.full"
+_pwrite_byte 0x00 $((BLKSZ - 17)) $((BLKSZ + 17)) "$TESTDIR/file2.chk" >> "$seqres.full"
+_test_remount
+
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file2.chk" | _filter_test_dir
+
+C1="$(_md5_checksum "$TESTDIR/file1")"
+C2="$(_md5_checksum "$TESTDIR/file2")"
+
+test "${C1}" = "${C2}" || echo "file1 and file2 should match"
+
+echo "fpunch files"
+"$XFS_IO_PROG" -f -c "fpunch $((BLKSZ - 17)) $((BLKSZ + 17))" "$TESTDIR/file2"
+_test_remount
+
+echo "Compare files"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file2.chk" | _filter_test_dir
+
+C1="$(_md5_checksum "$TESTDIR/file1")"
+C2="$(_md5_checksum "$TESTDIR/file2")"
+
+test "${C1}" != "${C2}" || echo "file1 and file2 should not match"
+
+echo "Compare against check files"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file2.chk" || echo "file2 and file2.chk do not match"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/847.out b/tests/generic/847.out
new file mode 100644
index 0000000..8139857
--- /dev/null
+++ b/tests/generic/847.out
@@ -0,0 +1,11 @@ 
+QA output created by 847
+Create the original files
+998b4ba52f2940dc515001e75926b19f  TEST_DIR/test-847/file1
+998b4ba52f2940dc515001e75926b19f  TEST_DIR/test-847/file2
+8cdf70c9cfb33bdc7397806b87e7c7ea  TEST_DIR/test-847/file2.chk
+fpunch files
+Compare files
+998b4ba52f2940dc515001e75926b19f  TEST_DIR/test-847/file1
+8cdf70c9cfb33bdc7397806b87e7c7ea  TEST_DIR/test-847/file2
+8cdf70c9cfb33bdc7397806b87e7c7ea  TEST_DIR/test-847/file2.chk
+Compare against check files
diff --git a/tests/generic/848 b/tests/generic/848
new file mode 100755
index 0000000..cb848fb
--- /dev/null
+++ b/tests/generic/848
@@ -0,0 +1,96 @@ 
+#! /bin/bash
+# FS QA Test No. 848
+#
+# Ensure that unaligned zero-range steps around reflinked ranges:
+#   - Create a reflink clone of a file
+#   - Perform an unaligned zero-range in the middle of the file.
+#   - Check that the reflinked areas are still there.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015, 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/reflink
+
+# real QA test starts here
+_supported_os Linux
+_require_test_reflink
+_require_cp_reflink
+_require_xfs_io_command "fzero"
+
+rm -f "$seqres.full"
+
+TESTDIR="$TEST_DIR/test-$seq"
+rm -rf "$TESTDIR"
+mkdir "$TESTDIR"
+
+echo "Create the original files"
+BLKSZ=65536
+_pwrite_byte 0x61 0 $((BLKSZ * 3)) "$TESTDIR/file1" >> "$seqres.full"
+
+_cp_reflink "$TESTDIR/file1" "$TESTDIR/file2"
+
+_pwrite_byte 0x61 0 $((BLKSZ * 3)) "$TESTDIR/file2.chk" >> "$seqres.full"
+_pwrite_byte 0x00 $((BLKSZ - 17)) $((BLKSZ + 17)) "$TESTDIR/file2.chk" >> "$seqres.full"
+_test_remount
+
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file2.chk" | _filter_test_dir
+
+C1="$(_md5_checksum "$TESTDIR/file1")"
+C2="$(_md5_checksum "$TESTDIR/file2")"
+
+test "${C1}" = "${C2}" || echo "file1 and file2 should match"
+
+echo "fzero files"
+"$XFS_IO_PROG" -f -c "fzero $((BLKSZ - 17)) $((BLKSZ + 17))" "$TESTDIR/file2"
+_test_remount
+
+echo "Compare files"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file2.chk" | _filter_test_dir
+
+C1="$(_md5_checksum "$TESTDIR/file1")"
+C2="$(_md5_checksum "$TESTDIR/file2")"
+
+test "${C1}" != "${C2}" || echo "file1 and file2 should not match"
+
+echo "Compare against check files"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file2.chk" || echo "file2 and file2.chk do not match"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/848.out b/tests/generic/848.out
new file mode 100644
index 0000000..94c674b
--- /dev/null
+++ b/tests/generic/848.out
@@ -0,0 +1,11 @@ 
+QA output created by 848
+Create the original files
+998b4ba52f2940dc515001e75926b19f  TEST_DIR/test-848/file1
+998b4ba52f2940dc515001e75926b19f  TEST_DIR/test-848/file2
+8cdf70c9cfb33bdc7397806b87e7c7ea  TEST_DIR/test-848/file2.chk
+fzero files
+Compare files
+998b4ba52f2940dc515001e75926b19f  TEST_DIR/test-848/file1
+8cdf70c9cfb33bdc7397806b87e7c7ea  TEST_DIR/test-848/file2
+8cdf70c9cfb33bdc7397806b87e7c7ea  TEST_DIR/test-848/file2.chk
+Compare against check files
diff --git a/tests/generic/849 b/tests/generic/849
new file mode 100755
index 0000000..76f1e70
--- /dev/null
+++ b/tests/generic/849
@@ -0,0 +1,80 @@ 
+#! /bin/bash
+# FS QA Test No. 849
+#
+# Test the convention that reflink with length == 0 means "to the end of fileA"
+#   - Create a file.
+#   - Try to reflink "zero" bytes.
+#   - Check that the reflink happened.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015, 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/reflink
+
+# real QA test starts here
+_supported_os Linux
+_require_test_reflink
+_require_cp_reflink
+
+rm -f "$seqres.full"
+
+TESTDIR="$TEST_DIR/test-$seq"
+rm -rf "$TESTDIR"
+mkdir "$TESTDIR"
+
+echo "Create the original files"
+BLKSZ=65536
+_pwrite_byte 0x61 0 $((BLKSZ * 256)) "$TESTDIR/file1" >> "$seqres.full"
+_pwrite_byte 0x62 0 $((BLKSZ * 256)) "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x62 0 $((BLKSZ * 2)) "$TESTDIR/file2.chk" >> "$seqres.full"
+_pwrite_byte 0x61 $((BLKSZ * 2)) $((BLKSZ * 255)) "$TESTDIR/file2.chk" >> "$seqres.full"
+_reflink_range "$TESTDIR/file1" $BLKSZ "$TESTDIR/file2" $((BLKSZ * 2)) 0 >> "$seqres.full"
+_test_remount
+
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file2.chk" | _filter_test_dir
+
+C1="$(_md5_checksum "$TESTDIR/file1")"
+C2="$(_md5_checksum "$TESTDIR/file2")"
+
+test "${C1}" != "${C2}" || echo "file1 and file2 should not match"
+
+echo "Compare against check files"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file2.chk" || echo "file2 and file2.chk do not match"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/849.out b/tests/generic/849.out
new file mode 100644
index 0000000..159305a
--- /dev/null
+++ b/tests/generic/849.out
@@ -0,0 +1,6 @@ 
+QA output created by 849
+Create the original files
+f4820540fc0ac02750739896fe028d56  TEST_DIR/test-849/file1
+dc881c004745c49f7f4e9cc766f57bc8  TEST_DIR/test-849/file2
+dc881c004745c49f7f4e9cc766f57bc8  TEST_DIR/test-849/file2.chk
+Compare against check files
diff --git a/tests/generic/850 b/tests/generic/850
new file mode 100755
index 0000000..954d41d
--- /dev/null
+++ b/tests/generic/850
@@ -0,0 +1,117 @@ 
+#! /bin/bash
+# FS QA Test No. 850
+#
+# Test the convention that reflink with length == 0 means "to the end of fileA"
+#   - Create a file.
+#   - Try to reflink "zero" bytes (which means reflink to EOF).
+#   - Check that the reflink happened.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015, 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/reflink
+
+# real QA test starts here
+_supported_os Linux
+_require_test_reflink
+_require_cp_reflink
+
+rm -f "$seqres.full"
+
+TESTDIR="$TEST_DIR/test-$seq"
+rm -rf "$TESTDIR"
+mkdir "$TESTDIR"
+
+echo "Create the original files"
+BLKSZ=65536
+_pwrite_byte 0x61 0 $((BLKSZ * 256)) "$TESTDIR/file1" >> "$seqres.full"
+_pwrite_byte 0x62 0 $((BLKSZ * 257)) "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x62 0 $((BLKSZ * 257)) "$TESTDIR/file2.chk" >> "$seqres.full"
+_dedupe_range "$TESTDIR/file1" $BLKSZ "$TESTDIR/file2" $((BLKSZ * 2)) 0 >> "$seqres.full"
+_test_remount
+
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file2.chk" | _filter_test_dir
+
+C1="$(_md5_checksum "$TESTDIR/file1")"
+C2="$(_md5_checksum "$TESTDIR/file2")"
+
+test "${C1}" != "${C2}" || echo "file1 and file2 should not match"
+
+echo "Compare against check files"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file2.chk" || echo "file2 and file2.chk do not match"
+
+echo "Make the original file almost dedup-able"
+_pwrite_byte 0x61 0 $((BLKSZ * 256)) "$TESTDIR/file1" >> "$seqres.full"
+_pwrite_byte 0x61 0 $((BLKSZ * 256)) "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x61 0 $((BLKSZ * 256)) "$TESTDIR/file2.chk" >> "$seqres.full"
+_dedupe_range "$TESTDIR/file1" $BLKSZ "$TESTDIR/file2" $((BLKSZ * 2)) 0 >> "$seqres.full"
+_test_remount
+
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file2.chk" | _filter_test_dir
+
+C1="$(_md5_checksum "$TESTDIR/file1")"
+C2="$(_md5_checksum "$TESTDIR/file2")"
+
+test "${C1}" != "${C2}" || echo "file1 and file2 should not match"
+
+echo "Compare against check files"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file2.chk" || echo "file2 and file2.chk do not match"
+
+echo "Make the original file dedup-able"
+_pwrite_byte 0x61 0 $((BLKSZ * 256)) "$TESTDIR/file1" >> "$seqres.full"
+_pwrite_byte 0x61 0 $((BLKSZ * 257)) "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x61 0 $((BLKSZ * 257)) "$TESTDIR/file2.chk" >> "$seqres.full"
+_dedupe_range "$TESTDIR/file1" $BLKSZ "$TESTDIR/file2" $((BLKSZ * 2)) 0 >> "$seqres.full"
+_test_remount
+
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file2.chk" | _filter_test_dir
+
+C1="$(_md5_checksum "$TESTDIR/file1")"
+C2="$(_md5_checksum "$TESTDIR/file2")"
+
+test "${C1}" = "${C2}" || echo "file1 and file2 should match"
+
+echo "Compare against check files"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file2.chk" || echo "file2 and file2.chk do not match"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/850.out b/tests/generic/850.out
new file mode 100644
index 0000000..126187e
--- /dev/null
+++ b/tests/generic/850.out
@@ -0,0 +1,17 @@ 
+QA output created by 850
+Create the original files
+f4820540fc0ac02750739896fe028d56  TEST_DIR/test-850/file1
+69ad53078a16243d98e21d9f8704a071  TEST_DIR/test-850/file2
+69ad53078a16243d98e21d9f8704a071  TEST_DIR/test-850/file2.chk
+Compare against check files
+Make the original file almost dedup-able
+f4820540fc0ac02750739896fe028d56  TEST_DIR/test-850/file1
+158d4e3578b94b89cbb44493a2110fb9  TEST_DIR/test-850/file2
+158d4e3578b94b89cbb44493a2110fb9  TEST_DIR/test-850/file2.chk
+Compare against check files
+Make the original file dedup-able
+f4820540fc0ac02750739896fe028d56  TEST_DIR/test-850/file1
+113c7055ffe3d24d2dec27e82ab55abd  TEST_DIR/test-850/file2
+113c7055ffe3d24d2dec27e82ab55abd  TEST_DIR/test-850/file2.chk
+file1 and file2 should match
+Compare against check files
diff --git a/tests/generic/group b/tests/generic/group
index 355603f..bf33541 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -257,3 +257,8 @@ 
 323 auto aio stress
 324 auto fsr quick
 325 auto quick data log
+820 auto quick clone
+847 auto quick clone
+848 auto quick clone
+849 auto quick clone
+850 auto quick clone