Userland version of struct vnode ?

[Pranav Peshwe]

Hello,
          Why is the 'Userland version' struct vnode created i.e struct
xvnode (in vnode.h) ? The comment says that it is 'for sysctl'.There are
also userland versions of struct file and struct tty.Can anybody please
explain about their use ?

TIA.

Regards,
Pranav

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