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| author |   Christian Brauner <brauner@kernel.org> | 2025-02-21 14:13:09 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-03-04 09:29:53 +0100 |
| commit | d83a55b826e3f830f0772bd9d7f68b4ed63d2122 (patch) | |
| tree | 6573230ae923f36504b03d2216c26e74fc8506a2 | |
| parent | fs: mount detached mounts onto detached mounts (diff) | |
| download | wireguard-linux-d83a55b826e3f830f0772bd9d7f68b4ed63d2122.tar.xz wireguard-linux-d83a55b826e3f830f0772bd9d7f68b4ed63d2122.zip | |
selftests: first test for mounting detached mounts onto detached mounts
Add a test to verify that detached mounts behave correctly.
Link: https://lore.kernel.org/r/20250221-brauner-open_tree-v1-10-dbcfcb98c676@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
| -rw-r--r-- | tools/testing/selftests/mount_setattr/mount_setattr_test.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/tools/testing/selftests/mount_setattr/mount_setattr_test.c b/tools/testing/selftests/mount_setattr/mount_setattr_test.c index 885d98f2d889..0641d2e22e02 100644 --- a/tools/testing/selftests/mount_setattr/mount_setattr_test.c +++ b/tools/testing/selftests/mount_setattr/mount_setattr_test.c @@ -1789,4 +1789,44 @@ TEST_F(mount_setattr, open_tree_detached_fail3) ASSERT_EQ(errno, EINVAL); } +TEST_F(mount_setattr, mount_detached_mount_on_detached_mount_then_close) +{ + 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); + /* + * /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, 0, &stx), 0); + ASSERT_TRUE(stx.stx_attributes & STATX_ATTR_MOUNT_ROOT); + + ASSERT_NE(move_mount(fd_tree_subdir, "", fd_tree_base, "", MOVE_MOUNT_F_EMPTY_PATH | MOVE_MOUNT_T_EMPTY_PATH), 0); + + EXPECT_EQ(close(fd_tree_base), 0); + EXPECT_EQ(close(fd_tree_subdir), 0); +} + TEST_HARNESS_MAIN |