pivot_root()

[Lai Zit Seng]

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 :)

Regards,

.lzs
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