tests: add mount_setattr() selftests
Add a range of selftests for the new mount_setattr() syscall to verify
that it works as expected. This tests that:
- no invalid flags can be specified
- changing properties of a single mount works and leaves other mounts in
the mount tree unchanged
- changing a mount tre to read-only when one of the mounts has writers
fails and leaves the whole mount tree unchanged
- changing mount properties from multiple threads works
- changing atime settings works
- changing mount propagation works
- changing the mount options of a mount tree where the individual mounts
in the tree have different mount options only changes the flags that
were requested to change
- changing mount options from another mount namespace fails
- changing mount options from another user namespace fails
[==========] Running 9 tests from 2 test cases.
[ RUN ] mount_setattr.invalid_attributes
[ OK ] mount_setattr.invalid_attributes
[ RUN ] mount_setattr.basic
[ OK ] mount_setattr.basic
[ RUN ] mount_setattr.basic_recursive
[ OK ] mount_setattr.basic_recursive
[ RUN ] mount_setattr.mount_has_writers
[ OK ] mount_setattr.mount_has_writers
[ RUN ] mount_setattr.mixed_mount_options
[ OK ] mount_setattr.mixed_mount_options
[ RUN ] mount_setattr.time_changes
[ OK ] mount_setattr.time_changes
[ RUN ] mount_setattr.multi_threaded
[ OK ] mount_setattr.multi_threaded
[ RUN ] mount_setattr.wrong_user_namespace
[ OK ] mount_setattr.wrong_user_namespace
[ RUN ] mount_setattr.wrong_mount_namespace
[ OK ] mount_setattr.wrong_mount_namespace
[==========] 9 / 9 tests passed.
[ PASSED ]
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
6 files changed
