[LTP] [PATCH v2] mount_setattr02.c: Check mount_setattr attr.propagation

[Petr Vorel]

Hi Wei,

nit: You did not change commit message subject (we talked about it).

> --- /dev/null
> +++ b/testcases/kernel/syscalls/mount_setattr/mount_setattr02.c
> @@ -0,0 +1,103 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2025 SUSE LLC Wei Gao <wegao@suse.com>
> + */
> +
> +/*\
> + * [Description]
NOTE: this '[Description]' should no longer be added.

See:
https://github.com/linux-test-project/ltp/commit/a3e27df34d6cb49477c9bd6f9bbaa1ce4de155f9
(it updated also examples in doc)

and follow ups
https://github.com/linux-test-project/ltp/commit/63eceaa2a83bca41997edcd649eb62272622a100
https://github.com/linux-test-project/ltp/commit/824f66ca72fc7505a31c30792334905b646c9d37
> + *
> + * Basic mount_setattr() test.
nit: here is better a blank line.
> + * Test basic propagation mount attributes are set correctly.
> + */
> +
> +#define _GNU_SOURCE
> +
> +#include <sys/statvfs.h>
> +#include "tst_test.h"
> +#include "lapi/fsmount.h"
> +#include "tst_safe_stdio.h"
> +
> +#define DIRA "/DIRA_PROPAGATION_CHECK"

Also, I found a way to test into TMPDIR. There is no need to touch a real root.
It works even on separate /tmp.

If you agree, I merge with following diff.
https://github.com/pevik/ltp/blob/wei/mount_setattr02.v2.fixes/testcases/kernel/syscalls/mount_setattr/mount_setattr02.c

With changes below.
Reviewed-by: Petr Vorel <pvorel@suse.cz>

Kind regards,
Petr

+++ testcases/kernel/syscalls/mount_setattr/mount_setattr02.c
@@ -4,9 +4,8 @@
  */
 
 /*\
- * [Description]
- *
  * Basic mount_setattr() test.
+ *
  * Test basic propagation mount attributes are set correctly.
  */
 
@@ -17,9 +16,9 @@
 #include "lapi/fsmount.h"
 #include "tst_safe_stdio.h"
 
-#define DIRA "/DIRA_PROPAGATION_CHECK"
+static char *tmpdir;
 
-static int dir_created, mounted;
+static int mounted;
 
 static bool is_shared_mount(const char *path)
 {
@@ -52,19 +51,15 @@ static bool is_shared_mount(const char *path)
 static void cleanup(void)
 {
 	if (mounted)
-		SAFE_UMOUNT(DIRA);
-
-	if (dir_created)
-		SAFE_RMDIR(DIRA);
+		SAFE_UMOUNT(tmpdir);
 }
 
 static void setup(void)
 {
-	SAFE_MKDIR(DIRA, 0777);
+	tmpdir = tst_tmpdir_path();
 	SAFE_UNSHARE(CLONE_NEWNS);
-	dir_created = 1;
 	SAFE_MOUNT(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0);
-	SAFE_MOUNT("testing", DIRA, "tmpfs", MS_NOATIME | MS_NODEV, "");
+	SAFE_MOUNT("testing", tmpdir, "tmpfs", MS_NOATIME | MS_NODEV, "");
 	mounted = 1;
 }
 
@@ -75,24 +70,24 @@ static void run(void)
 		.attr_clr       = MOUNT_ATTR__ATIME,
 	};
 
-	TST_EXP_PASS_SILENT(mount_setattr(-1, DIRA, 0, &attr, sizeof(attr)));
-	TST_EXP_EQ_LI(is_shared_mount(DIRA), 0);
+	TST_EXP_PASS_SILENT(mount_setattr(-1, tmpdir, 0, &attr, sizeof(attr)));
+	TST_EXP_EQ_LI(is_shared_mount(tmpdir), 0);
 
 	attr.propagation = -1;
-	TST_EXP_FAIL_SILENT(mount_setattr(-1, DIRA, 0, &attr, sizeof(attr)), EINVAL);
-	TST_EXP_EQ_LI(is_shared_mount(DIRA), 0);
+	TST_EXP_FAIL_SILENT(mount_setattr(-1, tmpdir, 0, &attr, sizeof(attr)), EINVAL);
+	TST_EXP_EQ_LI(is_shared_mount(tmpdir), 0);
 
 	attr.propagation = MS_SHARED;
-	TST_EXP_PASS_SILENT(mount_setattr(-1, DIRA, 0, &attr, sizeof(attr)));
-	TST_EXP_EQ_LI(is_shared_mount(DIRA), 1);
+	TST_EXP_PASS_SILENT(mount_setattr(-1, tmpdir, 0, &attr, sizeof(attr)));
+	TST_EXP_EQ_LI(is_shared_mount(tmpdir), 1);
 
 	attr.propagation = MS_PRIVATE;
-	TST_EXP_PASS_SILENT(mount_setattr(-1, DIRA, 0, &attr, sizeof(attr)));
-	TST_EXP_EQ_LI(is_shared_mount(DIRA), 0);
+	TST_EXP_PASS_SILENT(mount_setattr(-1, tmpdir, 0, &attr, sizeof(attr)));
+	TST_EXP_EQ_LI(is_shared_mount(tmpdir), 0);
 
 	attr.propagation = MS_SLAVE;
-	TST_EXP_PASS_SILENT(mount_setattr(-1, DIRA, 0, &attr, sizeof(attr)));
-	TST_EXP_EQ_LI(is_shared_mount(DIRA), 0);
+	TST_EXP_PASS_SILENT(mount_setattr(-1, tmpdir, 0, &attr, sizeof(attr)));
+	TST_EXP_EQ_LI(is_shared_mount(tmpdir), 0);
 }
 
 static struct tst_test test = {
@@ -100,4 +95,5 @@ static struct tst_test test = {
 	.setup = setup,
 	.cleanup = cleanup,
 	.needs_root = 1,
+	.needs_tmpdir = 1,
 };