btrfs: setxattr on subvolume directory

This is a regression test for "Btrfs: disable xattr operations on
subvolume directories". On v4.9, it will result in an aborted
transaction.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/btrfs/047

@@ -0,0 +1,69 @@
+#! /bin/bash
+# FS QA Test 047
+#
+# Test that we can't set xattrs on subvolume placeholder directories.
+# Regression test for Btrfs: disable xattr operations on subvolume directories.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 Facebook.  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/attr
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+_supported_fs btrfs
+_supported_os Linux
+_require_attrs
+_require_scratch
+
+_scratch_mkfs >/dev/null 2>&1
+_scratch_mount
+
+$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/parent" >>$seqres.full
+$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/parent/child" >>$seqres.full
+$BTRFS_UTIL_PROG subvolume snapshot "$SCRATCH_MNT/parent" "$SCRATCH_MNT/snapshot" >>$seqres.full
+
+$SETFATTR_PROG -n user.test -v foo "$SCRATCH_MNT/snapshot/child" |& _filter_scratch
+
+# The original bug resulted in bogus delayed inodes being inserted, so run the
+# delayed inodes by doing a commit.
+$BTRFS_UTIL_PROG filesystem sync "$SCRATCH_MNT" >>$seqres.full
+
+status=0
+exit

tests/btrfs/047.out

@@ -0,0 +1,2 @@
+QA output created by 047
+setfattr: SCRATCH_MNT/snapshot/child: Operation not supported

tests/btrfs/group

@@ -49,6 +49,7 @@
 044 auto quick send
 045 auto quick send
 046 auto quick send
+047 auto quick snapshot attr
 048 auto quick
 049 auto quick
 050 auto quick send