Re: pivot_root()

[serue]

Quoting Lai Zit Seng (lzs@xxxxxxxxx):
> 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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