[PATCH v3 2/2] xfs/533: test xfs_db whether still can get corrupted field value

[Yang Xu <xuyang2018.jy@fujitsu.com>]

This is a regression test that xfs_db code doesn't clean up the
LIBXFS_READBUF_SALVAGE call sites in set_cur so that we can't use the
return value directly and scraping it out later.

Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
---
 tests/xfs/533     | 34 ++++++++++++++++++++++++++++++++++
 tests/xfs/533.out |  5 +++++
 2 files changed, 39 insertions(+)
 create mode 100755 tests/xfs/533
 create mode 100644 tests/xfs/533.out

diff --git a/tests/xfs/533 b/tests/xfs/533
new file mode 100755
index 00000000..c0a4c0d2
--- /dev/null
+++ b/tests/xfs/533
@@ -0,0 +1,34 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 FUJITSU LIMITED. All rights reserved.
+#
+# FS QA Test 533
+#
+# Regression test for xfsprogs commit
+# f4afdcb0ad11 ("xfs_db: clean up the salvage read callsites in set_cur()")
+#
+# This case test xfs_db whether can get the new magicnum field value even we
+# just have corrupted this field value.
+#
+
+. ./common/preamble
+_begin_fstest auto quick db
+
+# real QA test starts here
+_supported_fs xfs
+_fixed_by_git_commit xfsprogs f4afdcb0ad11 \
+	"xfs_db: clean up the salvage read callsites in set_cur()"
+#skip fs check because invalid superblock 1
+_require_scratch_nocheck
+
+_scratch_mkfs_xfs >>$seqres.full 2>&1
+
+# write the bad magicnum field value(0) to the superblock 1
+_scratch_xfs_set_metadata_field "magicnum" "0" "sb 1"
+
+#Even magicnum filed has been corrupted, we still can read this filed value
+_scratch_xfs_get_metadata_field "magicnum" "sb 1"
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/533.out b/tests/xfs/533.out
new file mode 100644
index 00000000..7deb78a3
--- /dev/null
+++ b/tests/xfs/533.out
@@ -0,0 +1,5 @@
+QA output created by 533
+Allowing write of corrupted data with good CRC
+magicnum = 0
+bad magic number
+0
-- 
2.23.0