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This idea is borrowed from simonpunk's susfs4ksu. What we see here is that, yeah well, lets just have userspace send us what it wants unmounted, this is better than hardcoding everything. This also solves that issue where MNT_DETACH fails, as long as we send unmountables in proper order. A small anti-duplicate mechanism is also added. While in-kernel umount is a bit worse than zygisk-provider-based ones, this can still serve as a healthy alternative. --------- Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com> Co-authored-by: weishu <twsxtd@gmail.com> Signed-off-by: fc5b87cf <rissu.ntk@gmail.com>