> >how about letting nfs_readlink() hold a credential in n_rcred as
> >nfs_open() does, so that it can be used by nfs_doio_read() later?
> 
> That sounds fine. For reference, FreeBSD passes thread info and
> credentials through to nfs_doio().

iirc, we used to do it, prior to ubc.

YAMAMOTO Takashi