Quoting Lai Zit Seng ([email protected]):
> Not sure where to post this, forgive me if there is a better place to
> post...
>
> I'm trying to use pivot_root() to change root to a directory that is not
> a mount point, i.e. it is under a mount point of a different device from
> the current root device.
>
> E.g.
>
> # /root is mounted from /dev/sda1
> pivot_root("/root/somewhere", "/root/somewhere/initrd");
>
> But pivot_root() returns EINVAL. Both /root/somewhere and
> /root/somewhere/initrd exists.
>
> Any pointers about what might be wrong? Many thanks :)
Try first doing
mount --bind <newroot> <newroot>
See the comments above fs/namespace.c:sys_pivot_root() for the
explanation.
-serge
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