generic: check fiemap SHARED flag on sync

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>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/generic/353

@@ -0,0 +1,92 @@
+#! /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 $blocksize | _filter_xfs_io
+
+# check their fiemap to make sure it's correct
+echo "before sync:"
+echo "$file1" | _filter_scratch
+$XFS_IO_PROG -c "fiemap -v" $file1 | _filter_fiemap_flags
+echo "$file2" | _filter_scratch
+$XFS_IO_PROG -c "fiemap -v" $file2 | _filter_fiemap_flags
+
+# sync and recheck, to make sure the fiemap doesn't change just
+# due to sync
+sync
+echo "after sync:"
+echo "$file1" | _filter_scratch
+$XFS_IO_PROG -c "fiemap -v" $file1 | _filter_fiemap_flags
+echo "$file2" | _filter_scratch
+$XFS_IO_PROG -c "fiemap -v" $file2 | _filter_fiemap_flags
+
+# success, all done
+status=0
+exit

tests/generic/353.out

@@ -0,0 +1,15 @@
+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)
+before sync:
+SCRATCH_MNT/file1
+0: [0..127]: 0x2001
+SCRATCH_MNT/file2
+0: [0..127]: 0x2001
+after sync:
+SCRATCH_MNT/file1
+0: [0..127]: 0x2001
+SCRATCH_MNT/file2
+0: [0..127]: 0x2001

tests/generic/group

@@ -355,3 +355,4 @@
 350 blockdev quick rw
 351 blockdev quick rw
 352 auto clone
+353 auto quick clone