[PATCH] split chroot(9) into kern_chroot() and chroot()

[Paul Herman <pherman@xxxxxxxxxxxxxxx>]

Hey there,

As just mentioned on kernel@, I'm porting jail_attach(2) from
FreeBSD and ran into a snag because I needed to call chroot() from
within the kernel.  The attached patch will help by splitting
chroot() into kern_chroot() and the syscall hook.

Perhaps the only oddity is that kern_chroot() takes a struct vnode*
rather than struct nameidata*.  This is intentional because I will
need to call kern_chroot() from jail_attach() with only a vnode
reference available to me.  Not the same as most other kern_*
functions, but it should be OK.

I've got this running now and it seems to work, but I'd appreciate
any comments/suggestions. Thanks!

-Paul.

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