UIO_NOCOPY in smbfs

[Jonas Trollvik <jontro@xxxxxxxxx>]

How hard would it be to add the UIO_NOCOPY functionality in smbfs?

This is required for sendfile(2) to work

in  /usr/src/sys/vfs/smbfs/smbfs_io.c on line 183 this exists:
        /*
         * Protect against method which is not supported for now
         */
        if (uiop->uio_segflg == UIO_NOCOPY)
                return EOPNOTSUPP;
EOPNOTSUPP is also the error that sendfile returns.

If it's not too hard, I might give it a try as a newbeginner kernel
hacker, given the right directions...
I've seen this error reported on various places since this problem
aslo exists in freebsd

Regards
Jonas Trollvik