text: /*
   * Copyright (c) 1992, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Rick Macklem at The University of Guelph.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)nfs_nqlease.c	8.9 (Berkeley) 5/20/95
   * $FreeBSD: src/sys/nfs/nfs_nqlease.c,v 1.50 2000/02/13 03:32:05 peter Exp $
   * $DragonFly: src/sys/vfs/nfs/nfs_kerb.c,v 1.3 2006/09/05 00:55:50 dillon Exp $
   */
  
  #include <sys/param.h>
  #include <sys/vnode.h>
  #include <sys/malloc.h>
  #include <sys/mount.h>
  #include <sys/kernel.h>
  #include <sys/proc.h>
  #include <sys/systm.h>
  #include <sys/mbuf.h>
  #include <sys/socket.h>
  #include <sys/socketvar.h>
  #include <sys/protosw.h>
  
  #include <netinet/in.h>
  #include "rpcv2.h"
  #include "nfsproto.h"
  #include "nfs.h"
  #include "nfsm_subs.h"
  #include "xdr_subs.h"
  #include "nfsmount.h"
  #include "nfsnode.h"
  
  #include <sys/thread2.h>
  
  #define TRUE	1
  #define	FALSE	0
  
  #ifndef NFS_NOSERVER 
  
  /*
   * Nqnfs client helper daemon. Runs once a second to expire leases.
   * It also get authorization strings for "kerb" mounts.
   * It must start at the beginning of the list again after any potential
   * "sleep" since nfs_reclaim() called from vclean() can pull a node off
   * the list asynchronously.
   */
  int
  nfs_clientd(struct nfsmount *nmp, struct ucred *cred, struct nfsd_cargs *ncd,
  	    int flag, caddr_t argp, struct thread *td)
  {
  	struct nfsuid *nuidp, *nnuidp;
  	int error = 0;
  
  	/*
  	 * If an authorization string is being passed in, get it.
  	 */
  	if ((flag & NFSSVC_GOTAUTH) &&
  	    (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT)) == 0) {
  	    if (nmp->nm_state & NFSSTA_HASAUTH)
  		panic("cld kerb");
  	    if ((flag & NFSSVC_AUTHINFAIL) == 0) {
  		if (ncd->ncd_authlen <= nmp->nm_authlen &&
  		    ncd->ncd_verflen <= nmp->nm_verflen &&
  		    !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&&
  		    !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){
  		    nmp->nm_authtype = ncd->ncd_authtype;
  		    nmp->nm_authlen = ncd->ncd_authlen;
  		    nmp->nm_verflen = ncd->ncd_verflen;
  #ifdef NFSKERB
  		    nmp->nm_key = ncd->ncd_key;
  #endif
  		} else
  		    nmp->nm_state |= NFSSTA_AUTHERR;
  	    } else
  		nmp->nm_state |= NFSSTA_AUTHERR;
  	    nmp->nm_state |= NFSSTA_HASAUTH;
  	    wakeup((caddr_t)&nmp->nm_authlen);
  	} else
  	    nmp->nm_state |= NFSSTA_WAITAUTH;
  
  	/*
  	 * Loop every second updating queue until there is a termination sig.
  	 */
  	while ((nmp->nm_state & NFSSTA_DISMNT) == 0) {
  	    /*
  	     * Get an authorization string, if required.
  	     */
  	    if ((nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT | NFSSTA_HASAUTH)) == 0) {
  		ncd->ncd_authuid = nmp->nm_authuid;
  		if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs)))
  			nmp->nm_state |= NFSSTA_WAITAUTH;
  		else
  			return (ENEEDAUTH);
  	    }
  
  	    /*
  	     * Wait a bit (no pun) and do it again.
  	     */
  	    if ((nmp->nm_state & NFSSTA_DISMNT) == 0 &&
  		(nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_HASAUTH))) {
  		    error = tsleep((caddr_t)&nmp->nm_authstr, PCATCH,
  			"nqnfstimr", hz / 3);
  		    if (error == EINTR || error == ERESTART)
  			(void) dounmount(nmp->nm_mountp, 0, 0);
  	    }
  	}
  
  	/*
  	 * Finally, we can free up the mount structure.
  	 */
  	TAILQ_FOREACH_MUTABLE(nuidp, &nmp->nm_uidlruhead, nu_lru, nnuidp) {
  		LIST_REMOVE(nuidp, nu_hash);
  		TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
  		kfree((caddr_t)nuidp, M_NFSUID);
  	}
  	nfs_free_mount(nmp);
  	if (error == EWOULDBLOCK)
  		error = 0;
  	return (error);
  }
  
  #endif /* NFS_NOSERVER */
  
  