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[RFC,11/16] selftests: second test for mounting detached mounts onto detached mounts

Message ID 20250221-brauner-open_tree-v1-11-dbcfcb98c676@kernel.org (mailing list archive)
State New
Headers show
Series fs: expand abilities of anonymous mount namespaces | expand

Commit Message

Christian Brauner Feb. 21, 2025, 1:13 p.m. UTC
Add a test to verify that detached mounts behave correctly.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 .../selftests/mount_setattr/mount_setattr_test.c   | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)
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Patch

diff --git a/tools/testing/selftests/mount_setattr/mount_setattr_test.c b/tools/testing/selftests/mount_setattr/mount_setattr_test.c
index 0641d2e22e02..082fdf19a9be 100644
--- a/tools/testing/selftests/mount_setattr/mount_setattr_test.c
+++ b/tools/testing/selftests/mount_setattr/mount_setattr_test.c
@@ -1829,4 +1829,53 @@  TEST_F(mount_setattr, mount_detached_mount_on_detached_mount_then_close)
 	EXPECT_EQ(close(fd_tree_subdir), 0);
 }
 
+TEST_F(mount_setattr, mount_detached_mount_on_detached_mount_and_attach)
+{
+	int fd_tree_base = -EBADF, fd_tree_subdir = -EBADF;
+	struct statx stx;
+	__u64 mnt_id = 0;
+
+	fd_tree_base = sys_open_tree(-EBADF, "/mnt",
+				     AT_NO_AUTOMOUNT | AT_SYMLINK_NOFOLLOW |
+				     OPEN_TREE_CLOEXEC | OPEN_TREE_CLONE);
+	ASSERT_GE(fd_tree_base, 0);
+	/*
+	 * /mnt testing tmpfs
+	 */
+	ASSERT_EQ(statx(fd_tree_base, "A", 0, 0, &stx), 0);
+	ASSERT_FALSE(stx.stx_attributes & STATX_ATTR_MOUNT_ROOT);
+
+	fd_tree_subdir = sys_open_tree(fd_tree_base, "",
+				       AT_NO_AUTOMOUNT | AT_SYMLINK_NOFOLLOW |
+				       AT_EMPTY_PATH | OPEN_TREE_CLOEXEC |
+				       OPEN_TREE_CLONE);
+	ASSERT_GE(fd_tree_subdir, 0);
+	/*
+	 * /mnt testing tmpfs
+	 */
+	ASSERT_EQ(statx(fd_tree_subdir, "A", 0, 0, &stx), 0);
+	ASSERT_FALSE(stx.stx_attributes & STATX_ATTR_MOUNT_ROOT);
+
+	/*
+	 * /mnt   testing tmpfs
+	 * `-/mnt testing tmpfs
+	 */
+	ASSERT_EQ(move_mount(fd_tree_subdir, "", fd_tree_base, "", MOVE_MOUNT_F_EMPTY_PATH | MOVE_MOUNT_T_EMPTY_PATH), 0);
+	ASSERT_EQ(statx(fd_tree_subdir, "", AT_EMPTY_PATH, STATX_MNT_ID_UNIQUE, &stx), 0);
+	ASSERT_TRUE(stx.stx_attributes & STATX_ATTR_MOUNT_ROOT);
+	ASSERT_TRUE(stx.stx_mask & STATX_MNT_ID_UNIQUE);
+	mnt_id = stx.stx_mnt_id;
+
+	ASSERT_NE(move_mount(fd_tree_subdir, "", fd_tree_base, "", MOVE_MOUNT_F_EMPTY_PATH | MOVE_MOUNT_T_EMPTY_PATH), 0);
+
+	ASSERT_EQ(move_mount(fd_tree_base, "", -EBADF, "/tmp/target1", MOVE_MOUNT_F_EMPTY_PATH), 0);
+	ASSERT_EQ(statx(-EBADF, "/tmp/target1", 0, STATX_MNT_ID_UNIQUE, &stx), 0);
+	ASSERT_TRUE(stx.stx_attributes & STATX_ATTR_MOUNT_ROOT);
+	ASSERT_TRUE(stx.stx_mask & STATX_MNT_ID_UNIQUE);
+	ASSERT_EQ(stx.stx_mnt_id, mnt_id);
+
+	EXPECT_EQ(close(fd_tree_base), 0);
+	EXPECT_EQ(close(fd_tree_subdir), 0);
+}
+
 TEST_HARNESS_MAIN