[PATCH] btrfs/298: add test for showing qgroups include staled sorted by path

[Sidong Yang <realwakka@gmail.com>]

Test for showing qgroups include a staled qgroup list sorted by path.
It crashed without checking qgroup has empty path. It fixed by the
following commit in btrfs-progs:

cd7f1e48 ("btrfs-progs: qgroup: check null in comparing paths")

Signed-off-by: Sidong Yang <realwakka@gmail.com>
---
 tests/btrfs/298     | 34 ++++++++++++++++++++++++++++++++++
 tests/btrfs/298.out |  2 ++
 2 files changed, 36 insertions(+)
 create mode 100755 tests/btrfs/298
 create mode 100644 tests/btrfs/298.out

diff --git a/tests/btrfs/298 b/tests/btrfs/298
new file mode 100755
index 00000000..5457423d
--- /dev/null
+++ b/tests/btrfs/298
@@ -0,0 +1,34 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2023 Sidong Yang.  All Rights Reserved.
+#
+# FS QA Test 298
+#
+# Test that showing qgourps list includes a staled qgroup without crash.
+#
+. ./common/preamble
+_begin_fstest auto quick qgroup
+
+ . ./common/filter
+
+_supported_fs btrfs
+_require_test
+_require_scratch
+
+_scratch_mkfs > /dev/null 2>&1
+_scratch_mount
+
+# Create stale qgroup with creating and deleting a subvolume.
+$BTRFS_UTIL_PROG quota enable $SCRATCH_MNT >> $seqres.full
+$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/a >> $seqres.full
+$BTRFS_UTIL_PROG subvolume delete $SCRATCH_MNT/a >> $seqres.full
+
+# Show qgroups list with sorting path without crash.
+$BTRFS_UTIL_PROG qgroup show --sort path $SCRATCH_MNT >> $seqres.full
+
+_scratch_unmount
+
+# success, all done
+echo "Silence is golden"
+status=0
+exit
diff --git a/tests/btrfs/298.out b/tests/btrfs/298.out
new file mode 100644
index 00000000..63434267
--- /dev/null
+++ b/tests/btrfs/298.out
@@ -0,0 +1,2 @@
+QA output created by 298
+Silence is golden
-- 
2.34.1