[PATCH RFC] xfs: test mkfs.xfs config file generation

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Test configuration file generation via mkfs, xfs_db, and xfs_spaceman.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
 tests/xfs/1909     |  123 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/1909.out |    2 +
 2 files changed, 125 insertions(+)
 create mode 100755 tests/xfs/1909
 create mode 100644 tests/xfs/1909.out

diff --git a/tests/xfs/1909 b/tests/xfs/1909
new file mode 100755
index 00000000000000..d405064c3e3d1d
--- /dev/null
+++ b/tests/xfs/1909
@@ -0,0 +1,123 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Oracle.  All Rights Reserved.
+#
+# FS QA Test 1909
+#
+# Functional testing for mkfs.xfs config file generation.
+#
+. ./common/preamble
+_begin_fstest auto mkfs
+
+# . ./common/filter
+
+_require_scratch
+_require_xfs_mkfs_cfgfile
+_require_xfs_spaceman_command "makecfg"
+_require_xfs_db_command "makecfg"
+_require_command "$XFS_ADMIN_PROG" "xfs_admin"
+
+# t1: Make sure all three tools generate the same config file
+_scratch_mkfs >> $seqres.full
+_scratch_mount
+$XFS_SPACEMAN_PROG -c "makecfg $tmp.spaceman1" $SCRATCH_MNT
+$XFS_ADMIN_PROG -C $tmp.onadmin1 $SCRATCH_MNT
+_scratch_unmount
+# strip out deprecation warnings (e.g. v4 filesystems)
+_scratch_mkfs -c makecfg=$tmp.mkfs1
+_scratch_xfs_db -c "makecfg $tmp.db1"
+_scratch_xfs_admin -C $tmp.offadmin1
+
+cmp -s $tmp.mkfs1 $tmp.spaceman1 || echo "mkfs config1 does not match spaceman?"
+cmp -s $tmp.db1 $tmp.spaceman1 || echo "db config1 does not match spaceman?"
+cmp -s $tmp.db1 $tmp.mkfs1 || echo "db config1 does not match mkfs?"
+cmp -s $tmp.onadmin1 $tmp.mkfs1 || echo "online admin config1 does not match mkfs?"
+cmp -s $tmp.offadmin1 $tmp.mkfs1 || echo "offline admin config1 does not match mkfs?"
+
+echo "*** spaceman config1" >> $seqres.full
+cat $tmp.spaceman1 >> $seqres.full
+echo "*** mkfs config1" >> $seqres.full
+cat $tmp.mkfs1 >> $seqres.full
+echo "*** db config1" >> $seqres.full
+cat $tmp.db1 >> $seqres.full
+echo "*** online admin config1" >> $seqres.full
+cat $tmp.onadmin1 >> $seqres.full
+echo "*** offline admin config1" >> $seqres.full
+cat $tmp.offadmin1 >> $seqres.full
+
+# t2: Make sure the output changes if we set a new rootdir inherit option
+_scratch_mount
+$XFS_IO_PROG -c 'chattr +P' -c 'chproj 33' $SCRATCH_MNT
+$XFS_SPACEMAN_PROG -c "makecfg $tmp.spaceman2" $SCRATCH_MNT
+_scratch_unmount
+_scratch_xfs_db -c "makecfg $tmp.db2"
+
+cmp -s $tmp.db2 $tmp.spaceman2 || echo "db config2 does not match spaceman?"
+cmp -s $tmp.db1 $tmp.db2 && echo "db config1 should be different from db config2"
+
+echo "*** spaceman config2" >> $seqres.full
+cat $tmp.spaceman2 >> $seqres.full
+echo "*** db config2" >> $seqres.full
+cat $tmp.db2 >> $seqres.full
+
+# t3: Format with t2 config file, make sure the results match t2 and not t1
+_scratch_mkfs -c options=$tmp.db2 >> $seqres.full
+_scratch_mount
+$XFS_SPACEMAN_PROG -c "makecfg $tmp.spaceman3" $SCRATCH_MNT
+_scratch_unmount
+_scratch_xfs_db -c "makecfg $tmp.db3"
+
+cmp -s $tmp.db3 $tmp.spaceman3 || echo "db config3 does not match spaceman?"
+cmp -s $tmp.db3 $tmp.db1 && echo "db config3 should be different from db config1"
+cmp -s $tmp.db3 $tmp.db2 || echo "db config3 does not match db config2?"
+
+echo "*** spaceman config3" >> $seqres.full
+cat $tmp.spaceman3 >> $seqres.full
+echo "*** db config3" >> $seqres.full
+cat $tmp.db3 >> $seqres.full
+
+# t4: Set autofsck filesystem property, make sure that gets reflected
+autofsck="$(grep 'autofsck=' $tmp.spaceman3 | sed -e 's/^.*autofsck=//g')"
+case "$autofsck" in
+"")
+	if grep -q 'crc=1' $tmp.spaceman3; then
+		new_autofsck=check
+	fi
+	;;
+repair) new_autofsck=check;;
+*)	new_autofsck=repair;;
+esac
+if [ -n "$new_autofsck" ]; then
+	$XFS_PROPERTY_PROG $SCRATCH_DEV set "autofsck=$new_autofsck" >> $seqres.full
+	_scratch_mount
+	$XFS_SPACEMAN_PROG -c "makecfg $tmp.spaceman4" $SCRATCH_MNT
+	_scratch_unmount
+	_scratch_xfs_db -c "makecfg $tmp.db4"
+
+	cmp -s $tmp.db4 $tmp.spaceman4 || echo "db config4 does not match spaceman?"
+	cmp -s $tmp.db4 $tmp.db3 && echo "db config4 should be different from db config3"
+
+	echo "*** spaceman config4" >> $seqres.full
+	cat $tmp.spaceman4 >> $seqres.full
+	echo "*** db config4" >> $seqres.full
+	cat $tmp.db4 >> $seqres.full
+
+	_scratch_mkfs -c options=$tmp.db4 >> $seqres.full
+	_scratch_mount
+	$XFS_SPACEMAN_PROG -c "makecfg $tmp.spaceman4a" $SCRATCH_MNT
+	_scratch_unmount
+	_scratch_xfs_db -c "makecfg $tmp.db4a"
+
+	cmp -s $tmp.db4a $tmp.spaceman4a || echo "db config4a does not match spaceman?"
+	cmp -s $tmp.db4a $tmp.db3 && echo "db config4a should be different from db config3"
+	cmp -s $tmp.db4a $tmp.db4 || echo "db config4a does not match db config4?"
+
+	echo "*** spaceman config4a" >> $seqres.full
+	cat $tmp.spaceman4a >> $seqres.full
+	echo "*** db config4a" >> $seqres.full
+	cat $tmp.db4a >> $seqres.full
+
+fi
+
+echo Silence is golden
+_exit 0
diff --git a/tests/xfs/1909.out b/tests/xfs/1909.out
new file mode 100644
index 00000000000000..c17c5522d48db4
--- /dev/null
+++ b/tests/xfs/1909.out
@@ -0,0 +1,2 @@
+QA output created by 1909
+Silence is golden