95648f9ed0
If pivot_root() fails, we'll fall back to switching root via MS_MOVE. Unlike pivot_root() that won't place the old root fs anyway, but just hide it. That's problematic during shutdown for example, since after all we might still want to access it from the exitrd, to disassemble it properly. Hence let's make things somewhat systematic: regardless if pivot_root() or MS_MOVE is used, always make the old root fs show up in the selected new dir.
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