[PATCH] fstests: generic: Test SHARED flag about fiemap ioctl before and after sync

[Qu Wenruo <quwenruo@cn.fujitsu.com>]

The test case will check SHARED flag returned by fiemap ioctl on
reflinked files before and after sync.

Normally SHARED flag won't change just due to a normal sync operation.

But btrfs doesn't handle SHARED flag well, and this time it won't check
any delayed extent tree(reverse extent searching tree) modification, but
only metadata already committed to disk.

So btrfs will not return correct SHARED flag on reflinked files if there
is no sync to commit all metadata.

This testcase will just check it.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
------
And of course, xfs handles it quite well. Nice work Darrick.
Also the test case needs the new infrastructure introduced in previous
generic/352 test case.
---
 tests/generic/353     | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/generic/353.out |  9 ++++++
 tests/generic/group   |  1 +
 3 files changed, 96 insertions(+)
 create mode 100755 tests/generic/353
 create mode 100644 tests/generic/353.out

diff --git a/tests/generic/353 b/tests/generic/353
new file mode 100755
index 0000000..1e9117e
--- /dev/null
+++ b/tests/generic/353
@@ -0,0 +1,86 @@
+#! /bin/bash
+# FS QA Test 353
+#
+# Check if fiemap ioctl returns correct SHARED flag on reflinked file
+# before and after sync the fs
+#
+# Btrfs has a bug in checking shared extent, which can only handle metadata
+# already committed to disk, but not delayed extent tree modification.
+# This caused SHARED flag only occurs after sync.
+#
+#-----------------------------------------------------------------------
+# 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
+. ./common/punch
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os Linux
+_require_scratch_reflink
+_require_fiemap
+
+_scratch_mkfs > /dev/null 2>&1
+_scratch_mount
+
+blocksize=64k
+file1="$SCRATCH_MNT/file1"
+file2="$SCRATCH_MNT/file2"
+
+# write the initial file
+_pwrite_byte 0xcdcdcdcd 0 $blocksize $file1 | _filter_xfs_io
+
+# reflink initial file
+_reflink_range $file1 0 $file2 0 $blocksize | _filter_xfs_io
+
+# check their fiemap to make sure it's correct
+$XFS_IO_PROG -c "fiemap -v" $file1 | _filter_fiemap_flags
+$XFS_IO_PROG -c "fiemap -v" $file2 | _filter_fiemap_flags
+
+# sync and recheck, to make sure the fiemap doesn't change just
+# due to sync
+sync
+$XFS_IO_PROG -c "fiemap -v" $file1 | _filter_fiemap_flags
+$XFS_IO_PROG -c "fiemap -v" $file2 | _filter_fiemap_flags
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/353.out b/tests/generic/353.out
new file mode 100644
index 0000000..0cd8981
--- /dev/null
+++ b/tests/generic/353.out
@@ -0,0 +1,9 @@
+QA output created by 353
+wrote 65536/65536 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+linked 65536/65536 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+0: [0..127]: 0x2001
+0: [0..127]: 0x2001
+0: [0..127]: 0x2001
+0: [0..127]: 0x2001
diff --git a/tests/generic/group b/tests/generic/group
index 3f00386..0392d4d 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -355,3 +355,4 @@
 350 blockdev quick rw
 351 blockdev quick rw
 352 auto clone
+353 auto quick clone
-- 
2.5.5