generic: add test of file mode when setfacl fails

Check that the group permission bits of a file are not altered when
setfacl fails. At the time of this patch the test fails for at least
ext2, ext4, jfs and btrfs.

The failure in setfacl is induced by filling the device and setting
as many user attributes to the file as possible. For xfs this is not
enough, and the test will not run.

[eguan replaced setfattr with $SETFATTR_PROG and added enospc group]

Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/generic/449

@@ -0,0 +1,98 @@
+#! /bin/bash
+# FS QA Test 449
+#
+# Fill the device and set as many extended attributes to a file as
+# possible. Then call setfacl on it and, if this fails for lack of
+# space, test that the permissions remain the same.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 Ernesto A. Fernandez.  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
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os Linux
+_require_scratch
+_require_test
+_require_acls
+_require_attrs
+
+_scratch_mkfs_sized $((50 * 1024 * 1024)) >> $seqres.full 2>&1
+_scratch_mount || _fail "mount failed"
+
+TFILE=$SCRATCH_MNT/testfile.$seq
+
+# Create the test file and choose its permissions
+touch $TFILE
+chmod u+rwx $TFILE
+chmod go-rwx $TFILE
+
+# Try to run out of space so setfacl will fail
+$XFS_IO_PROG -c "pwrite 0 50m" $TFILE >>$seqres.full 2>&1
+i=1
+j=1
+ret=0
+while [ $ret -eq 0 ]; do
+	ret=1
+	while [ $j -le 1000 ]; do
+		# On btrfs, setfattr will sometimes fail when free space is
+		# low, long before it's actually exhausted. Insist until it
+		# fails consistently.
+		$SETFATTR_PROG -n user.$i"x"$j $TFILE &>/dev/null
+		ret=$(( $ret && $? ))
+		((++j))
+	done
+	j=1
+	((++i))
+done
+
+if setfacl -m m:r $TFILE &>/dev/null; then
+	# setfacl succeeded, so the test was meaningless
+	# The filesystem might still have an issue
+	_notrun "$FSTYP succeeds in setting acls despite running out of space for user attrs"
+fi
+
+# Since setfacl failed, the permissions should not have changed
+stat -c %A $TFILE
+
+status=0
+exit

tests/generic/449.out

@@ -0,0 +1,2 @@
+QA output created by 449
+-rwx------

tests/generic/group

@@ -451,3 +451,4 @@
 446 auto quick rw dangerous
 447 auto quick clone
 448 auto quick rw
+449 auto quick acl enospc