Fix display of default xattr to show 'sa'

When the default value of the xattr property was changed from 'dir' to
'sa', the code that displays the property's value was not affected. The
problem with this state of affairs is that 1) user tooling that
specifically looked for 'sa' before will be confused now that the code
displays 'on' instead. And 2) users may be confused when manually
running the commands about which specific type of xattr is in use unless
they are up to date on the latest zfs changes.

The fix here is to show the actual type always, rather than 'on' if we
happen to be using the default. This turns out to be easy to do, by
simply reordering the list of xattr values in the properties code. When
the property is displayed, we iterate down the table until we find a row
with a matching value, and use that row's name as the
display. Reordering the row fixes the display without affecting any
other code.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Closes #17801

module/zcommon/zfs_prop.c

@@ -364,8 +364,8 @@ zfs_prop_init(void)
 
 	static const zprop_index_t xattr_table[] = {
 		{ "off",	ZFS_XATTR_OFF },
-		{ "on",		ZFS_XATTR_SA },
 		{ "sa",		ZFS_XATTR_SA },
+		{ "on",		ZFS_XATTR_SA },
 		{ "dir",	ZFS_XATTR_DIR },
 		{ NULL }
 	};

tests/runfiles/common.run

@@ -1090,7 +1090,8 @@ tags = ['functional', 'write_dirs']
 [tests/functional/xattr]
 tests = ['xattr_001_pos', 'xattr_002_neg', 'xattr_003_neg', 'xattr_004_pos',
     'xattr_005_pos', 'xattr_006_pos', 'xattr_007_neg',
-    'xattr_011_pos', 'xattr_012_pos', 'xattr_013_pos', 'xattr_compat']
+    'xattr_011_pos', 'xattr_012_pos', 'xattr_013_pos', 'xattr_014_pos',
+    'xattr_compat']
 tags = ['functional', 'xattr']
 
 [tests/functional/zvol/zvol_ENOSPC]

tests/runfiles/sanity.run

@@ -622,7 +622,7 @@ tags = ['functional', 'vdev_zaps']
 [tests/functional/xattr]
 tests = ['xattr_001_pos', 'xattr_002_neg', 'xattr_003_neg', 'xattr_004_pos',
     'xattr_005_pos', 'xattr_006_pos', 'xattr_007_neg',
-    'xattr_011_pos', 'xattr_013_pos', 'xattr_compat']
+    'xattr_011_pos', 'xattr_013_pos', 'xattr_014_pos', 'xattr_compat']
 tags = ['functional', 'xattr']
 
 [tests/functional/zvol/zvol_ENOSPC]

tests/zfs-tests/tests/Makefile.am

@@ -2234,6 +2234,7 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
 	functional/xattr/xattr_011_pos.ksh \
 	functional/xattr/xattr_012_pos.ksh \
 	functional/xattr/xattr_013_pos.ksh \
+	functional/xattr/xattr_014_pos.ksh \
 	functional/xattr/xattr_compat.ksh \
 	functional/zap_shrink/cleanup.ksh \
 	functional/zap_shrink/zap_shrink_001_pos.ksh \

tests/zfs-tests/tests/functional/delegate/delegate_common.kshlib

@@ -1234,10 +1234,10 @@ function verify_fs_aedsx
 	typeset oldval
 	set -A modes "on" "off"
 	oldval=$(get_prop $perm $fs)
-	if [[ $oldval == "on" ]]; then
-		n=1
-	elif [[ $oldval == "off" ]]; then
+	if [[ $oldval == "off" ]]; then
 		n=0
+	else
+		n=1
 	fi
 	log_note "$user zfs set $perm=${modes[$n]} $fs"
 	user_run $user zfs set $perm=${modes[$n]} $fs

tests/zfs-tests/tests/functional/xattr/xattr_014_pos.ksh

@@ -0,0 +1,53 @@
+#!/bin/ksh -p
+# SPDX-License-Identifier: CDDL-1.0
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or https://opensource.org/licenses/CDDL-1.0.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2025 by Klara, Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/xattr/xattr_common.kshlib
+
+#
+# DESCRIPTION:
+# The default xattr should be shown as 'sa', not 'on', for clarity.
+#
+# STRATEGY:
+#	1. Create a filesystem.
+#	2. Verify that the xattra is shown as 'sa'.
+#	3. Manually set the value to 'dir', 'sa', 'on', and 'off'.
+#	4. Verify that it is shown as 'dir', 'sa', 'sa', and 'off.
+#
+
+log_assert "The default and specific xattr values are displayed correctly."
+
+set -A args "dir" "sa" "on" "off"
+set -A display "dir" "sa" "sa" "off"
+
+log_must eval "[[ 'sa' == '$(zfs get -Hpo value xattr $TESTPOOL)' ]]"
+
+for i in `seq 0 3`; do
+	log_must zfs set xattr="${args[$i]}" $TESTPOOL
+	log_must eval "[[ '${display[$i]}' == '$(zfs get -Hpo value xattr $TESTPOOL)' ]]"
+done
+log_pass "The default and specific xattr values are displayed correctly."