generic: test that xattrs can have slashes in their names

Eric Sandeen recently found a bug in xfs_repair that flagged extended
attribute names containing "/" as corrupt and purged them.  There's
nothing in the IRIX or Linux manuals that say anything about slashes not
being allowed (and Linux certainly allows this) so let's make sure this
continues to work.

[Eryu: use $SETFATTR and _getfattr helper]

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

tests/generic/523

@@ -0,0 +1,50 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (c) 2019 Oracle, Inc.  All Rights Reserved.
+#
+# FS QA Test No. 523
+#
+# Check that xattrs can have slashes in their name.
+#
+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 -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/attr
+. ./common/filter
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+_require_scratch
+_require_attrs
+
+rm -f $seqres.full
+
+_scratch_mkfs >> $seqres.full 2>&1
+_scratch_mount
+
+echo "set attr"
+file=$SCRATCH_MNT/moofile
+touch $file
+$SETFATTR_PROG -n "user.boo/hoo" -v "woof" $file
+
+echo "check attr"
+_getfattr -d --absolute-names $file | _filter_scratch
+
+# Now we let the fsck tool check the filesystem, because xfs_repair had a
+# regression where it would flag and erase any xattr with a '/' in it.
+
+status=0
+exit

tests/generic/523.out

@@ -0,0 +1,6 @@
+QA output created by 523
+set attr
+check attr
+# file: SCRATCH_MNT/moofile
+user.boo/hoo="woof"
+

tests/generic/group

@@ -525,3 +525,4 @@
 520 auto quick log
 521 soak long_rw
 522 soak long_rw
+523 auto quick attr