Unverified Commit 70619d40 authored by Christian Brauner's avatar Christian Brauner
Browse files

selftests/kernfs: test xattr retrieval 

Make sure that listxattr() returns zero and that getxattr() returns
ENODATA when no extended attributs are set. Use /sys/kernel/warn_count
as that always exists and is a read-only file.

Link: https://lore.kernel.org/20250702-hochmoderne-abklatsch-af9c605b57b2@brauner


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 05a03931

tools/testing/selftests/filesystems/.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -3,3 +3,4 @@ dnotify_test 
devpts_pts

file_stressor

anon_inode_test

kernfs_test

tools/testing/selftests/filesystems/Makefile

+1 −1
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0



CFLAGS += $(KHDR_INCLUDES)

TEST_GEN_PROGS := devpts_pts file_stressor anon_inode_test

TEST_GEN_PROGS := devpts_pts file_stressor anon_inode_test kernfs_test

TEST_GEN_PROGS_EXTENDED := dnotify_test



include ../lib.mk

tools/testing/selftests/filesystems/kernfs_test.c

0 → 100644
+38 −0
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// SPDX-License-Identifier: GPL-2.0

#define _GNU_SOURCE

#define __SANE_USERSPACE_TYPES__



#include <fcntl.h>

#include <stdio.h>

#include <sys/stat.h>

#include <sys/xattr.h>



#include "../kselftest_harness.h"

#include "wrappers.h"



TEST(kernfs_listxattr)

{

	int fd;



	/* Read-only file that can never have any extended attributes set. */

	fd = open("/sys/kernel/warn_count", O_RDONLY | O_CLOEXEC);

	ASSERT_GE(fd, 0);

	ASSERT_EQ(flistxattr(fd, NULL, 0), 0);

	EXPECT_EQ(close(fd), 0);

}



TEST(kernfs_getxattr)

{

	int fd;

	char buf[1];



	/* Read-only file that can never have any extended attributes set. */

	fd = open("/sys/kernel/warn_count", O_RDONLY | O_CLOEXEC);

	ASSERT_GE(fd, 0);

	ASSERT_LT(fgetxattr(fd, "user.foo", buf, sizeof(buf)), 0);

	ASSERT_EQ(errno, ENODATA);

	EXPECT_EQ(close(fd), 0);

}



TEST_HARNESS_MAIN