[PATCH 04/11] reflink: test CoW behaviors of reflinked files

Darrick J. Wong
2015-11-11T19:27:31Z

Ensure that CoW happens correctly with buffered, directio, and mmap writes.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
tests/generic/808 | 152 +++++++++++++++++++++++++++++++++++++++++++++++++
tests/generic/808.out | 19 ++++++
tests/generic/809 | 151 +++++++++++++++++++++++++++++++++++++++++++++++++
tests/generic/809.out | 19 ++++++
tests/generic/810 | 152 +++++++++++++++++++++++++++++++++++++++++++++++++
tests/generic/810.out | 19 ++++++
tests/generic/837 | 91 +++++++++++++++++++++++++++++
tests/generic/837.out | 8 +++
tests/generic/838 | 91 +++++++++++++++++++++++++++++
tests/generic/838.out | 8 +++
tests/generic/group | 5 ++
11 files changed, 715 insertions(+)
create mode 100755 tests/generic/808
create mode 100644 tests/generic/808.out
create mode 100755 tests/generic/809
create mode 100644 tests/generic/809.out
create mode 100755 tests/generic/810
create mode 100644 tests/generic/810.out
create mode 100755 tests/generic/837
create mode 100644 tests/generic/837.out
create mode 100755 tests/generic/838
create mode 100644 tests/generic/838.out

diff --git a/tests/generic/808 b/tests/generic/808
new file mode 100755
index 0000000..3a3ec58
--- /dev/null
+++ b/tests/generic/808
@@ -0,0 +1,152 @@
+#! /bin/bash
+# FS QA Test No. 808
+#
+# Ensuring that copy on write through the page cache works:
+# - Reflink two files together
+# - Write to the beginning, middle, and end
+# - Check that the files are now different where we say they're different.
+#
+#-----------------------------------------------------------------------
+# 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 * 48 - 3)) "$TESTDIR/file1" >> "$seqres.full"
+_cp_reflink "$TESTDIR/file1" "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x61 0 $((BLKSZ * 48 - 3)) "$TESTDIR/file3" >> "$seqres.full"
+_test_remount
+
+echo "Compare files"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file3" | _filter_test_dir
+
+cmp -s "$TESTDIR/file1" "$TESTDIR/file2" || echo "Files 1-2 do not match"
+cmp -s "$TESTDIR/file1" "$TESTDIR/file3" || echo "Files 1-3 do not match"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file3" || echo "Files 2-3 do not match"
+
+echo "pagecache CoW the second file"
+_pwrite_byte 0x62 0 17 "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x62 0 17 "$TESTDIR/file3" >> "$seqres.full"
+
+_pwrite_byte 0x62 $((BLKSZ * 16 - 34)) 17 "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x62 $((BLKSZ * 16 - 34)) 17 "$TESTDIR/file3" >> "$seqres.full"
+
+_pwrite_byte 0x62 $((BLKSZ * 48 - 8)) 17 "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x62 $((BLKSZ * 48 - 8)) 17 "$TESTDIR/file3" >> "$seqres.full"
+_test_remount
+
+echo "Compare files"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file3" | _filter_test_dir
+
+cmp -s "$TESTDIR/file1" "$TESTDIR/file2" || echo "Files 1-2 do not match (intentional)"
+cmp -s "$TESTDIR/file1" "$TESTDIR/file3" || echo "Files 1-3 do not match (intentional)"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file3" || echo "Files 2-3 do not match"
+
+echo "Compare the CoW'd section to the before file"
+_compare_range "$TESTDIR/file1" 0 "$TESTDIR/file2" 0 17 \
+ || echo "Start sections do not match (intentional)"
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 16 - 34)) \
+ "$TESTDIR/file2" $((BLKSZ * 16 - 34)) 17 \
+ || echo "Middle sections do not match (intentional)"
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 48 - 8)) \
+ "$TESTDIR/file2" $((BLKSZ * 48 - 8)) 17 \
+ || echo "End sections do not match (intentional)"
+
+echo "Compare the CoW'd section to the after file"
+_compare_range "$TESTDIR/file2" 0 "$TESTDIR/file3" 0 17 \
+ || echo "Start sections do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 16 - 34)) \
+ "$TESTDIR/file3" $((BLKSZ * 16 - 34)) 17 \
+ || echo "Middle sections do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 48 - 8)) \
+ "$TESTDIR/file3" $((BLKSZ * 48 - 8)) 17 \
+ || echo "End sections do not match"
+
+echo "Compare the not CoW'd sections"
+_compare_range "$TESTDIR/file1" 18 "$TESTDIR/file2" 18 17 \
+ || echo "Start sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" 18 "$TESTDIR/file3" 18 17 \
+ || echo "Start sections of 2-3 do not match"
+
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 16 - 17)) \
+ "$TESTDIR/file2" $((BLKSZ * 16 - 17)) 82 \
+ || echo "Middle sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 16 - 17)) \
+ "$TESTDIR/file3" $((BLKSZ * 16 - 17)) 82 \
+ || echo "Middle sections of 2-3 do not match"
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 48 - 108)) \
+ "$TESTDIR/file2" $((BLKSZ * 48 - 108)) 100 \
+ || echo "End sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 48 - 108)) \
+ "$TESTDIR/file3" $((BLKSZ * 48 - 108)) 100 \
+ || echo "End sections of 2-3 do not match"
+
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 14)) \
+ "$TESTDIR/file2" $((BLKSZ * 14)) $BLKSZ \
+ || echo "Untouched sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 14)) \
+ "$TESTDIR/file3" $((BLKSZ * 14)) $BLKSZ \
+ || echo "Untouched sections of 2-3 do not match"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/808.out b/tests/generic/808.out
new file mode 100644
index 0000000..1e82e2d
--- /dev/null
+++ b/tests/generic/808.out
@@ -0,0 +1,19 @@
+QA output created by 808
+Create the original files
+Compare files
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-808/file1
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-808/file2
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-808/file3
+pagecache CoW the second file
+Compare files
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-808/file1
+4a879c2f322121f6f4b8ebede1909a7c TEST_DIR/test-808/file2
+4a879c2f322121f6f4b8ebede1909a7c TEST_DIR/test-808/file3
+Files 1-2 do not match (intentional)
+Files 1-3 do not match (intentional)
+Compare the CoW'd section to the before file
+Start sections do not match (intentional)
+Middle sections do not match (intentional)
+End sections do not match (intentional)
+Compare the CoW'd section to the after file
+Compare the not CoW'd sections
diff --git a/tests/generic/809 b/tests/generic/809
new file mode 100755
index 0000000..99e88f6
--- /dev/null
+++ b/tests/generic/809
@@ -0,0 +1,151 @@
+#! /bin/bash
+# FS QA Test No. 809
+#
+# Ensuring that copy on write in direct-io mode works:
+# - Reflink two files together
+# - Write to the beginning, middle, and end in direct-io mode
+# - Check that the files are now different where we say they're different.
+#
+#-----------------------------------------------------------------------
+# 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 $((BLKSZ * 48 - 3)) "$TESTDIR/file1" >> "$seqres.full"
+_cp_reflink "$TESTDIR/file1" "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x61 0 $((BLKSZ * 48 - 3)) "$TESTDIR/file3" >> "$seqres.full"
+_test_remount
+
+echo "Compare files"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file3" | _filter_test_dir
+
+cmp -s "$TESTDIR/file1" "$TESTDIR/file2" || echo "Files 1-2 should match"
+cmp -s "$TESTDIR/file1" "$TESTDIR/file3" || echo "Files 1-3 should match"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file3" || echo "Files 2-3 should match"
+
+echo "directio CoW the second file"
+_pwrite_byte 0x62 0 $BLKSZ "$TESTDIR/file2" -d >> "$seqres.full"
+_pwrite_byte 0x62 0 $BLKSZ "$TESTDIR/file3" -d >> "$seqres.full"
+
+_pwrite_byte 0x62 $((BLKSZ * 16 - 512)) 512 "$TESTDIR/file2" -d >> "$seqres.full"
+_pwrite_byte 0x62 $((BLKSZ * 16 - 512)) 512 "$TESTDIR/file3" -d >> "$seqres.full"
+
+_pwrite_byte 0x62 $((BLKSZ * 48)) $BLKSZ "$TESTDIR/file2" -d >> "$seqres.full"
+_pwrite_byte 0x62 $((BLKSZ * 48)) $BLKSZ "$TESTDIR/file3" -d >> "$seqres.full"
+_test_remount
+
+echo "Compare files"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file3" | _filter_test_dir
+
+cmp -s "$TESTDIR/file1" "$TESTDIR/file2" || echo "Files 1-2 should not match (intentional)"
+cmp -s "$TESTDIR/file1" "$TESTDIR/file3" || echo "Files 1-3 should not match (intentional)"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file3" || echo "Files 2-3 should match"
+
+echo "Compare the CoW'd section to the before file"
+_compare_range "$TESTDIR/file1" 0 "$TESTDIR/file2" 0 $BLKSZ \
+ || echo "Start sections do not match (intentional)"
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 16 - 512)) \
+ "$TESTDIR/file2" $((BLKSZ * 16 - 512)) 512 \
+ || echo "Middle sections do not match (intentional)"
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 48 - 512)) \
+ "$TESTDIR/file2" $((BLKSZ * 48 - 512)) $BLKSZ \
+ || echo "End sections do not match (intentional)"
+
+echo "Compare the CoW'd section to the after file"
+_compare_range "$TESTDIR/file2" 0 "$TESTDIR/file3" 0 $BLKSZ \
+ || echo "Start sections do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 16 - 512)) \
+ "$TESTDIR/file3" $((BLKSZ * 16 - 512)) 512 \
+ || echo "Middle sections do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 48 - 512)) \
+ "$TESTDIR/file3" $((BLKSZ * 48 - 512)) $BLKSZ \
+ || echo "End sections do not match"
+
+echo "Compare the not CoW'd sections"
+_compare_range "$TESTDIR/file1" $BLKSZ "$TESTDIR/file2" $BLKSZ 512 \
+ || echo "Start sections of 1-2 do not match"
+_compare_range "$TESTDIR/file2" $BLKSZ "$TESTDIR/file3" $BLKSZ 512 \
+ || echo "Start sections of 2-3 do not match"
+
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 16 - 1024)) \
+ "$TESTDIR/file2" $((BLKSZ * 16 - 1024)) 512 \
+ || echo "Middle sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 16 - 1024)) \
+ "$TESTDIR/file3" $((BLKSZ * 16 - 1024)) 512 \
+ || echo "Middle sections of 2-3 do not match"
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 48 - 1024)) \
+ "$TESTDIR/file2" $((BLKSZ * 48 - 1024)) 512 \
+ || echo "End sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 48 - 1024)) \
+ "$TESTDIR/file3" $((BLKSZ * 48 - 1024)) 512 \
+ || echo "End sections of 2-3 do not match"
+
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 16)) \
+ "$TESTDIR/file2" $((BLKSZ * 16)) 512 \
+ || echo "Untouched sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 16)) \
+ "$TESTDIR/file3" $((BLKSZ * 16)) 512 \
+ || echo "Untouched sections of 2-3 do not match"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/809.out b/tests/generic/809.out
new file mode 100644
index 0000000..ad63e4e
--- /dev/null
+++ b/tests/generic/809.out
@@ -0,0 +1,19 @@
+QA output created by 809
+Create the original files
+Compare files
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-809/file1
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-809/file2
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-809/file3
+directio CoW the second file
+Compare files
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-809/file1
+ff5626fb6c71b242d6b1a43de25c9a85 TEST_DIR/test-809/file2
+ff5626fb6c71b242d6b1a43de25c9a85 TEST_DIR/test-809/file3
+Files 1-2 should not match (intentional)
+Files 1-3 should not match (intentional)
+Compare the CoW'd section to the before file
+Start sections do not match (intentional)
+Middle sections do not match (intentional)
+End sections do not match (intentional)
+Compare the CoW'd section to the after file
+Compare the not CoW'd sections
diff --git a/tests/generic/810 b/tests/generic/810
new file mode 100755
index 0000000..3b635f8
--- /dev/null
+++ b/tests/generic/810
@@ -0,0 +1,152 @@
+#! /bin/bash
+# FS QA Test No. 810
+#
+# Ensuring that mmap copy on write through the page cache works:
+# - Reflink two files together
+# - Write to the beginning, middle, and end
+# - Check that the files are now different where we say they're different.
+#
+#-----------------------------------------------------------------------
+# 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 * 48 - 3)) "$TESTDIR/file1" >> "$seqres.full"
+_cp_reflink "$TESTDIR/file1" "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x61 0 $((BLKSZ * 48 - 3)) "$TESTDIR/file3" >> "$seqres.full"
+_test_remount
+
+echo "Compare files"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file3" | _filter_test_dir
+
+cmp -s "$TESTDIR/file1" "$TESTDIR/file2" || echo "Files 1-2 do not match"
+cmp -s "$TESTDIR/file1" "$TESTDIR/file3" || echo "Files 1-3 do not match"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file3" || echo "Files 2-3 do not match"
+
+echo "mmap CoW the second file"
+_mwrite_byte 0x62 0 17 $((BLKSZ * 48 - 3)) "$TESTDIR/file2" >> "$seqres.full"
+_mwrite_byte 0x62 0 17 $((BLKSZ * 48 - 3)) "$TESTDIR/file3" >> "$seqres.full"
+
+_mwrite_byte 0x62 $((BLKSZ * 16 - 34)) 17 $((BLKSZ * 48 - 3)) "$TESTDIR/file2" >> "$seqres.full"
+_mwrite_byte 0x62 $((BLKSZ * 16 - 34)) 17 $((BLKSZ * 48 - 3)) "$TESTDIR/file3" >> "$seqres.full"
+
+_mwrite_byte 0x62 $((BLKSZ * 48 - 20)) 17 $((BLKSZ * 48 - 3)) "$TESTDIR/file2" >> "$seqres.full"
+_mwrite_byte 0x62 $((BLKSZ * 48 - 20)) 17 $((BLKSZ * 48 - 3)) "$TESTDIR/file3" >> "$seqres.full"
+_test_remount
+
+echo "Compare files"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+md5sum "$TESTDIR/file3" | _filter_test_dir
+
+cmp -s "$TESTDIR/file1" "$TESTDIR/file2" || echo "Files 1-2 do not match (intentional)"
+cmp -s "$TESTDIR/file1" "$TESTDIR/file3" || echo "Files 1-3 do not match (intentional)"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file3" || echo "Files 2-3 do not match"
+
+echo "Compare the CoW'd section to the before file"
+_compare_range "$TESTDIR/file1" 0 "$TESTDIR/file2" 0 17 \
+ || echo "Start sections do not match (intentional)"
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 16 - 34)) \
+ "$TESTDIR/file2" $((BLKSZ * 16 - 34)) 17 \
+ || echo "Middle sections do not match (intentional)"
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 48 - 20)) \
+ "$TESTDIR/file2" $((BLKSZ * 48 - 20)) 17 \
+ || echo "End sections do not match (intentional)"
+
+echo "Compare the CoW'd section to the after file"
+_compare_range "$TESTDIR/file2" 0 "$TESTDIR/file3" 0 17 \
+ || echo "Start sections do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 16 - 34)) \
+ "$TESTDIR/file3" $((BLKSZ * 16 - 34)) 17 \
+ || echo "Middle sections do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 48 - 20)) \
+ "$TESTDIR/file3" $((BLKSZ * 48 - 20)) 17 \
+ || echo "End sections do not match"
+
+echo "Compare the not CoW'd sections"
+_compare_range "$TESTDIR/file1" 18 "$TESTDIR/file2" 18 17 \
+ || echo "Start sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" 18 "$TESTDIR/file3" 18 17 \
+ || echo "Start sections of 2-3 do not match"
+
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 16 - 17)) \
+ "$TESTDIR/file2" $((BLKSZ * 16 - 17)) 82 \
+ || echo "Middle sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 16 - 17)) \
+ "$TESTDIR/file3" $((BLKSZ * 16 - 17)) 82 \
+ || echo "Middle sections of 2-3 do not match"
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 48 - 120)) \
+ "$TESTDIR/file2" $((BLKSZ * 48 - 120)) 100 \
+ || echo "End sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 48 - 120)) \
+ "$TESTDIR/file3" $((BLKSZ * 48 - 120)) 100 \
+ || echo "End sections of 2-3 do not match"
+
+
+_compare_range "$TESTDIR/file1" $((BLKSZ * 14)) \
+ "$TESTDIR/file2" $((BLKSZ * 14)) $BLKSZ \
+ || echo "Untouched sections of 1-2 do not match"
+
+_compare_range "$TESTDIR/file2" $((BLKSZ * 14)) \
+ "$TESTDIR/file3" $((BLKSZ * 14)) $BLKSZ \
+ || echo "Untouched sections of 2-3 do not match"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/810.out b/tests/generic/810.out
new file mode 100644
index 0000000..8cc94ab
--- /dev/null
+++ b/tests/generic/810.out
@@ -0,0 +1,19 @@
+QA output created by 810
+Create the original files
+Compare files
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-810/file1
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-810/file2
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-810/file3
+mmap CoW the second file
+Compare files
+60ebe700450b6015c17fa15cacb9493b TEST_DIR/test-810/file1
+795ecfd281dbda4916431376228e4187 TEST_DIR/test-810/file2
+795ecfd281dbda4916431376228e4187 TEST_DIR/test-810/file3
+Files 1-2 do not match (intentional)
+Files 1-3 do not match (intentional)
+Compare the CoW'd section to the before file
+Start sections do not match (intentional)
+Middle sections do not match (intentional)
+End sections do not match (intentional)
+Compare the CoW'd section to the after file
+Compare the not CoW'd sections
diff --git a/tests/generic/837 b/tests/generic/837
new file mode 100755
index 0000000..de5f233
--- /dev/null
+++ b/tests/generic/837
@@ -0,0 +1,91 @@
+#! /bin/bash
+# FS QA Test No. 837
+#
+# Ensure that reflinking a file N times and CoWing the copies leaves the
+# original intact.
+# - Create a file and record its hash
+# - Create some reflink copies
+# - Rewrite all the reflink copies
+# - Compare the contents of the original file
+#
+#-----------------------------------------------------------------------
+# 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 file blocks"
+BLKSZ=65536
+NR=9
+_pwrite_byte 0x61 0 $((BLKSZ * 256)) "$TESTDIR/file1" >> "$seqres.full"
+_test_remount
+
+md5sum "$TESTDIR/file1" | _filter_test_dir
+csum="$(_md5_checksum "$TESTDIR/file1")"
+
+echo "Create the reflink copies"
+seq 2 $NR | while read i; do
+ _cp_reflink "$TESTDIR/file1" "$TESTDIR/file$i"
+done
+_test_remount
+
+echo "Rewrite the copies"
+seq 2 $NR | while read i; do
+ _pwrite_byte 0x62 0 $((BLKSZ * 256)) "$TESTDIR/file$i" >> "$seqres.full"
+done
+_test_remount
+
+echo "Examine original file"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+
+mod_csum="$(_md5_checksum "$TESTDIR/file2")"
+new_csum="$(_md5_checksum "$TESTDIR/file1")"
+test "${csum}" != "${mod_csum}" || echo "checksums do not match"
+test "${csum}" = "${new_csum}" || echo "checksums do not match"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/837.out b/tests/generic/837.out
new file mode 100644
index 0000000..3f9c2e5
--- /dev/null
+++ b/tests/generic/837.out
@@ -0,0 +1,8 @@
+QA output created by 837
+Create the original file blocks
+f4820540fc0ac02750739896fe028d56 TEST_DIR/test-837/file1
+Create the reflink copies
+Rewrite the copies
+Examine original file
+f4820540fc0ac02750739896fe028d56 TEST_DIR/test-837/file1
+eb34153e9ed1e774db28cbbe4090a449 TEST_DIR/test-837/file2
diff --git a/tests/generic/838 b/tests/generic/838
new file mode 100755
index 0000000..1130a2c
--- /dev/null
+++ b/tests/generic/838
@@ -0,0 +1,91 @@
+#! /bin/bash
+# FS QA Test No. 838
+#
+# Ensure that reflinking a file N times and DIO CoWing the copies leaves the
+# original intact.
+# - Create a file and record its hash
+# - Create some reflink copies
+# - Rewrite all the reflink copies w/ directio
+# - Compare the contents of the original file
+#
+#-----------------------------------------------------------------------
+# 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 file blocks"
+BLKSZ=65536
+NR=9
+_pwrite_byte 0x61 0 $((BLKSZ * 256)) "$TESTDIR/file1" >> "$seqres.full"
+_test_remount
+
+md5sum "$TESTDIR/file1" | _filter_test_dir
+csum="$(_md5_checksum "$TESTDIR/file1")"
+
+echo "Create the reflink copies"
+seq 2 $NR | while read i; do
+ _cp_reflink "$TESTDIR/file1" "$TESTDIR/file$i"
+done
+_test_remount
+
+echo "Rewrite the copies"
+seq 2 $NR | while read i; do
+ _pwrite_byte 0x62 0 $((BLKSZ * 256)) "$TESTDIR/file$i" -d >> "$seqres.full"
+done
+_test_remount
+
+echo "Examine original file"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+
+mod_csum="$(_md5_checksum "$TESTDIR/file2")"
+new_csum="$(_md5_checksum "$TESTDIR/file1")"
+test "${csum}" != "${mod_csum}" || echo "checksums do not match"
+test "${csum}" = "${new_csum}" || echo "checksums do not match"
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/838.out b/tests/generic/838.out
new file mode 100644
index 0000000..cc44815
--- /dev/null
+++ b/tests/generic/838.out
@@ -0,0 +1,8 @@
+QA output created by 838
+Create the original file blocks
+f4820540fc0ac02750739896fe028d56 TEST_DIR/test-838/file1
+Create the reflink copies
+Rewrite the copies
+Examine original file
+f4820540fc0ac02750739896fe028d56 TEST_DIR/test-838/file1
+eb34153e9ed1e774db28cbbe4090a449 TEST_DIR/test-838/file2
diff --git a/tests/generic/group b/tests/generic/group
index 7f25037..a72d416 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -216,6 +216,11 @@
805 auto quick clone
806 auto quick clone
807 auto quick clone
+808 auto quick clone
+809 auto quick clone
+810 auto quick clone
817 auto quick clone
818 auto quick clone
819 auto quick clone
+837 auto quick clone
+838 auto quick clone