btrfs: test incremental send after renaming and linking file

Test that an incremental send operation works correctly when an inode A
is renamed, a new hard link added to it and some other inode B is renamed
to the old name of inode A.

The btrfs bug is fixed by the following patch for the linux kernel:

  "Btrfs: send, fix invalid path after renaming and linking file"

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/btrfs/144

@@ -0,0 +1,118 @@
+#! /bin/bash
+# FS QA Test No. btrfs/144
+#
+# Test that an incremental send operation works correctly when an inode A is
+# renamed, a new hard link added to it and some other inode B is renamed to
+# the old name of inode A.
+#
+#-----------------------------------------------------------------------
+#
+# Copyright (C) 2017 SUSE Linux Products GmbH. All Rights Reserved.
+# Author: Filipe Manana <fdmanana@suse.com>
+#
+# 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"
+
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -fr $send_files_dir
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs btrfs
+_supported_os Linux
+_require_test
+_require_scratch
+_require_fssum
+
+send_files_dir=$TEST_DIR/btrfs-test-$seq
+
+rm -f $seqres.full
+rm -fr $send_files_dir
+mkdir $send_files_dir
+
+_scratch_mkfs >>$seqres.full 2>&1
+_scratch_mount
+
+touch $SCRATCH_MNT/f1
+touch $SCRATCH_MNT/f2
+touch $SCRATCH_MNT/f3
+
+# Filesystem looks like:
+#
+# .                                                             (ino 256)
+# |
+# |--- f1                                                       (ino 257)
+# |--- f2                                                       (ino 258)
+# |--- f3                                                       (ino 259)
+#
+$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
+	$SCRATCH_MNT/mysnap1 > /dev/null
+
+$BTRFS_UTIL_PROG send -f $send_files_dir/1.snap \
+	$SCRATCH_MNT/mysnap1 2>&1 1>/dev/null | _filter_scratch
+
+mv $SCRATCH_MNT/f3 $SCRATCH_MNT/f4
+ln $SCRATCH_MNT/f2 $SCRATCH_MNT/f5
+mv $SCRATCH_MNT/f2 $SCRATCH_MNT/f3
+mv $SCRATCH_MNT/f1 $SCRATCH_MNT/f2
+
+# Filesystem now looks like:
+#
+# .                                                             (ino 256)
+# |
+# |--- f2                                                       (ino 257)
+# |--- f3                                                       (ino 258)
+# |--- f4                                                       (ino 259)
+# |--- f5                                                       (ino 258)
+#
+
+$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
+		 $SCRATCH_MNT/mysnap2 > /dev/null
+
+$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \
+		 $SCRATCH_MNT/mysnap2 2>&1 1>/dev/null | _filter_scratch
+
+$FSSUM_PROG -A -f -w $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
+$FSSUM_PROG -A -f -w $send_files_dir/2.fssum \
+	-x $SCRATCH_MNT/mysnap2/mysnap1 $SCRATCH_MNT/mysnap2
+
+# Now recreate the filesystem by receiving both send streams and verify we get
+# the same content that the original filesystem had.
+_scratch_unmount
+_scratch_mkfs >>$seqres.full 2>&1
+_scratch_mount
+
+$BTRFS_UTIL_PROG receive -f $send_files_dir/1.snap $SCRATCH_MNT > /dev/null
+$BTRFS_UTIL_PROG receive -f $send_files_dir/2.snap $SCRATCH_MNT > /dev/null
+$FSSUM_PROG -r $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
+$FSSUM_PROG -r $send_files_dir/2.fssum $SCRATCH_MNT/mysnap2
+
+status=0
+exit

tests/btrfs/144.out

@@ -0,0 +1,6 @@
+QA output created by 144
+At subvol SCRATCH_MNT/mysnap1
+At subvol SCRATCH_MNT/mysnap2
+At subvol mysnap1
+OK
+OK

tests/btrfs/group

@@ -146,3 +146,4 @@
 141 auto quick
 142 auto quick
 143 auto quick
+144 auto quick send