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selftests: first 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-v1-10-dbcfcb98c676@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-02-21 14:13:09 +01:00
parent 2110772383
commit d83a55b826
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 40 additions and 0 deletions
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40
tools/testing/selftests/mount_setattr/mount_setattr_test.c
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@ -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