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selftests: third test for mounting detached mounts onto detached mounts

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Add a test to verify that detached mounts behave correctly.

Link: https://lore.kernel.org/r/20250221-brauner-open_tree-v1-12-dbcfcb98c676@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-02-21 14:13:11 +01:00
parent 89ddfd4af1
commit 4fd0aea1ea
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 31 additions and 0 deletions
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31
tools/testing/selftests/mount_setattr/mount_setattr_test.c
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@ -1878,4 +1878,35 @@ TEST_F(mount_setattr, mount_detached_mount_on_detached_mount_and_attach)
EXPECT_EQ(close(fd_tree_subdir), 0);
}
TEST_F(mount_setattr, move_mount_detached_fail)
{
int fd_tree_base = -EBADF, fd_tree_subdir = -EBADF;
struct statx stx;
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);
/* Attach the mount to the caller's mount namespace. */
ASSERT_EQ(move_mount(fd_tree_base, "", -EBADF, "/tmp/target1", MOVE_MOUNT_F_EMPTY_PATH), 0);
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(-EBADF, "/tmp/B",
AT_NO_AUTOMOUNT | AT_SYMLINK_NOFOLLOW |
OPEN_TREE_CLOEXEC | OPEN_TREE_CLONE);
ASSERT_GE(fd_tree_subdir, 0);
ASSERT_EQ(statx(fd_tree_subdir, "BB", 0, 0, &stx), 0);
ASSERT_FALSE(stx.stx_attributes & STATX_ATTR_MOUNT_ROOT);
/* Not allowed to move an attached mount to a detached mount. */
ASSERT_NE(move_mount(fd_tree_base, "", fd_tree_subdir, "", MOVE_MOUNT_F_EMPTY_PATH | MOVE_MOUNT_T_EMPTY_PATH), 0);
ASSERT_EQ(errno, EINVAL);
EXPECT_EQ(close(fd_tree_base), 0);
EXPECT_EQ(close(fd_tree_subdir), 0);
}
TEST_HARNESS_MAIN