linux-kernel - [PATCH] selftests/mount_setattr: fix idmap_mount_tree

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Message-Id: <20241024095013.1213852-1-zhouyuhang1010@163.com>
Date: Thu, 24 Oct 2024 17:50:13 +0800
From: zhouyuhang <zhouyuhang1010@....com>
To: brauner@...nel.org,
	sforshee@...nel.org,
	shuah@...nel.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	zhouyuhang <zhouyuhang@...inos.cn>
Subject: [PATCH] selftests/mount_setattr: fix idmap_mount_tree_invalid failed to run

From: zhouyuhang <zhouyuhang@...inos.cn>

Test case idmap_mount_tree_invalid failed to run on the newer kernel
with the following output:

 #  RUN           mount_setattr_idmapped.idmap_mount_tree_invalid ...
 # mount_setattr_test.c:1428:idmap_mount_tree_invalid:Expected sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr,  sizeof(attr)) (0) ! = 0 (0)
 # idmap_mount_tree_invalid: Test terminated by assertion

This is because tmpfs is mounted at "/mnt/A", and tmpfs already
contains the flag FS_ALLOW_IDMAP after the commit 7a80e5b8c6fa ("shmem:
support idmapped mounts for tmpfs"). So calling sys_mount_setattr here
returns 0 instead of -EINVAL as expected.

Ramfs is mounted at "/mnt/B" and does not support idmap mounts.
So we can use "/mnt/B" instead of "/mnt/A" to make the test run
successfully with the following output:

 # Starting 1 tests from 1 test cases.
 #  RUN           mount_setattr_idmapped.idmap_mount_tree_invalid ...
 #            OK  mount_setattr_idmapped.idmap_mount_tree_invalid
 ok 1 mount_setattr_idmapped.idmap_mount_tree_invalid
 # PASSED: 1 / 1 tests passed.

Signed-off-by: zhouyuhang <zhouyuhang@...inos.cn>
---
 tools/testing/selftests/mount_setattr/mount_setattr_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mount_setattr/mount_setattr_test.c b/tools/testing/selftests/mount_setattr/mount_setattr_test.c
index c6a8c732b802..54552c19bc24 100644
--- a/tools/testing/selftests/mount_setattr/mount_setattr_test.c
+++ b/tools/testing/selftests/mount_setattr/mount_setattr_test.c
@@ -1414,7 +1414,7 @@ TEST_F(mount_setattr_idmapped, idmap_mount_tree_invalid)
 	ASSERT_EQ(expected_uid_gid(-EBADF, "/tmp/B/b", 0, 0, 0), 0);
 	ASSERT_EQ(expected_uid_gid(-EBADF, "/tmp/B/BB/b", 0, 0, 0), 0);
 
-	open_tree_fd = sys_open_tree(-EBADF, "/mnt/A",
+	open_tree_fd = sys_open_tree(-EBADF, "/mnt/B",
 				     AT_RECURSIVE |
 				     AT_EMPTY_PATH |
 				     AT_NO_AUTOMOUNT |
-- 
2.27.0