make kernel includes standard

[unix-history] / usr / src / sys / nfs / nfs_syscalls.c

/*
* Copyright (c) 1989 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.
*
* %sccs.include.redist.c%
*
*      @(#)nfs_syscalls.c      7.35 (Berkeley) %G%
*/

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/namei.h>

#include <netinet/in.h>
#include <netinet/tcp.h>
#ifdef ISO
#include <netiso/iso.h>
#endif
#include <nfs/rpcv2.h>
#include <nfs/nfsv2.h>
#include <nfs/nfs.h>
#include <nfs/nfsrvcache.h>
#include <nfs/nfsmount.h>
#include <nfs/nqnfs.h>

/* Global defs. */
extern u_long nfs_prog, nfs_vers;
extern int (*nfsrv_procs[NFS_NPROCS])();
extern struct queue_entry nfs_bufq;
extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
extern int nfs_numasync;
extern time_t nqnfsstarttime;
extern struct nfsrv_req nsrvq_head;
extern struct nfsd nfsd_head;
extern int nqsrv_writeslack;
struct nfssvc_sock *nfs_udpsock, *nfs_cltpsock;
int nuidhash_max = NFS_MAXUIDHASH;
static int nfs_numnfsd = 0;
int nfsd_waiting = 0;
static int notstarted = 1;
static int modify_flag = 0;
void nfsrv_cleancache(), nfsrv_rcv(), nfsrv_wakenfsd(), nfs_sndunlock();
void nfsrv_slpderef(), nfsrv_init();

#define TRUE    1
#define FALSE   0

static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON];
/*
* NFS server system calls
* getfh() lives here too, but maybe should move to kern/vfs_syscalls.c
*/

/*
* Get file handle system call
*/
struct getfh_args {
       char    *fname;
       fhandle_t *fhp;
};
getfh(p, uap, retval)
       struct proc *p;
       register struct getfh_args *uap;
       int *retval;
{
       register struct vnode *vp;
       fhandle_t fh;
       int error;
       struct nameidata nd;

       /*
        * Must be super user
        */
       if (error = suser(p->p_ucred, &p->p_acflag))
               return (error);
       NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, uap->fname, p);
       if (error = namei(&nd))
               return (error);
       vp = nd.ni_vp;
       bzero((caddr_t)&fh, sizeof(fh));
       fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
       error = VFS_VPTOFH(vp, &fh.fh_fid);
       vput(vp);
       if (error)
               return (error);
       error = copyout((caddr_t)&fh, (caddr_t)uap->fhp, sizeof (fh));
       return (error);
}

static struct nfssvc_sock nfssvc_sockhead;

#define SLP_DEREFFREE   0x100
#define SLP_CLRFREE     0x200

/*
* Nfs server psuedo system call for the nfsd's
* Based on the flag value it either:
* - adds a socket to the selection list
* - remains in the kernel as an nfsd
* - remains in the kernel as an nfsiod
*/
struct nfssvc_args {
       int flag;
       caddr_t argp;
};
nfssvc(p, uap, retval)
       struct proc *p;
       register struct nfssvc_args *uap;
       int *retval;
{
       struct nameidata nd;
       struct file *fp;
       struct mbuf *nam;
       struct nfsd_args nfsdarg;
       struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
       struct nfsd_cargs ncd;
       struct nfsd *nfsd;
       struct nfssvc_sock *slp;
       struct nfsuid *nuidp, **nuh;
       struct nfsmount *nmp;
       int error;

       /*
        * Must be super user
        */
       if (error = suser(p->p_ucred, &p->p_acflag))
               return (error);
       while (nfssvc_sockhead.ns_flag & SLP_INIT) {
               nfssvc_sockhead.ns_flag |= SLP_WANTINIT;
               (void) tsleep((caddr_t)&nfssvc_sockhead, PSOCK, "nfsd init", 0);
       }
       if (uap->flag & NFSSVC_BIOD)
               error = nfssvc_iod(p);
       else if (uap->flag & NFSSVC_MNTD) {
               if (error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd)))
                       return (error);
               NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
                       ncd.ncd_dirp, p);
               if (error = namei(&nd))
                       return (error);
               if ((nd.ni_vp->v_flag & VROOT) == 0)
                       error = EINVAL;
               nmp = VFSTONFS(nd.ni_vp->v_mount);
               vput(nd.ni_vp);
               if (error)
                       return (error);
               else if (nmp->nm_flag & NFSMNT_MNTD)
                       return (0);
               nmp->nm_flag |= NFSMNT_MNTD;
               error = nqnfs_clientd(nmp, p->p_ucred, &ncd, uap->flag,
                       uap->argp, p);
       } else if (uap->flag & NFSSVC_ADDSOCK) {
               if (error = copyin(uap->argp, (caddr_t)&nfsdarg,
                   sizeof(nfsdarg)))
                       return (error);
               if (error = getsock(p->p_fd, nfsdarg.sock, &fp))
                       return (error);
               /*
                * Get the client address for connected sockets.
                */
               if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
                       nam = (struct mbuf *)0;
               else if (error = sockargs(&nam, nfsdarg.name, nfsdarg.namelen,
                       MT_SONAME))
                       return (error);
               error = nfssvc_addsock(fp, nam);
       } else {
               if (error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd)))
                       return (error);
               if ((uap->flag & NFSSVC_AUTHIN) && (nfsd = nsd->nsd_nfsd) &&
                       (nfsd->nd_slp->ns_flag & SLP_VALID)) {
                       slp = nfsd->nd_slp;
                       if (slp->ns_numuids < nuidhash_max) {
                               slp->ns_numuids++;
                               nuidp = (struct nfsuid *)
                                  malloc(sizeof (struct nfsuid), M_NFSUID, M_WAITOK);
                       } else
                               nuidp = (struct nfsuid *)0;
                       if ((slp->ns_flag & SLP_VALID) == 0) {
                           if (nuidp)
                               free((caddr_t)nuidp, M_NFSUID);
                       } else {
                           if (nuidp == (struct nfsuid *)0) {
                               nuidp = slp->ns_lruprev;
                               remque(nuidp);
                               if (nuidp->nu_hprev)
                                       nuidp->nu_hprev->nu_hnext = nuidp->nu_hnext;
                               if (nuidp->nu_hnext)
                                       nuidp->nu_hnext->nu_hprev = nuidp->nu_hprev;
                           }
                           nuidp->nu_cr = nsd->nsd_cr;
                           nuidp->nu_cr.cr_ref = 1;
                           nuidp->nu_uid = nsd->nsd_uid;
                           insque(nuidp, (struct nfsuid *)slp);
                           nuh = &slp->ns_uidh[NUIDHASH(nsd->nsd_uid)];
                           if (nuidp->nu_hnext = *nuh)
                               nuidp->nu_hnext->nu_hprev = nuidp;
                           nuidp->nu_hprev = (struct nfsuid *)0;
                           *nuh = nuidp;
                       }
               }
               if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
                       nfsd->nd_flag |= NFSD_AUTHFAIL;
               error = nfssvc_nfsd(nsd, uap->argp, p);
       }
       if (error == EINTR || error == ERESTART)
               error = 0;
       return (error);
}

/*
* Adds a socket to the list for servicing by nfsds.
*/
nfssvc_addsock(fp, mynam)
       struct file *fp;
       struct mbuf *mynam;
{
       register struct mbuf *m;
       register int siz;
       register struct nfssvc_sock *slp;
       register struct socket *so;
       struct nfssvc_sock *tslp;
       int error, s;

       so = (struct socket *)fp->f_data;
       tslp = (struct nfssvc_sock *)0;
       /*
        * Add it to the list, as required.
        */
       if (so->so_proto->pr_protocol == IPPROTO_UDP) {
               tslp = nfs_udpsock;
               if (tslp->ns_flag & SLP_VALID) {
                       m_freem(mynam);
                       return (EPERM);
               }
#ifdef ISO
       } else if (so->so_proto->pr_protocol == ISOPROTO_CLTP) {
               tslp = nfs_cltpsock;
               if (tslp->ns_flag & SLP_VALID) {
                       m_freem(mynam);
                       return (EPERM);
               }
#endif /* ISO */
       }
       if (so->so_type == SOCK_STREAM)
               siz = NFS_MAXPACKET + sizeof (u_long);
       else
               siz = NFS_MAXPACKET;
       if (error = soreserve(so, siz, siz)) {
               m_freem(mynam);
               return (error);
       }

       /*
        * Set protocol specific options { for now TCP only } and
        * reserve some space. For datagram sockets, this can get called
        * repeatedly for the same socket, but that isn't harmful.
        */
       if (so->so_type == SOCK_STREAM) {
               MGET(m, M_WAIT, MT_SOOPTS);
               *mtod(m, int *) = 1;
               m->m_len = sizeof(int);
               sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m);
       }
       if (so->so_proto->pr_domain->dom_family == AF_INET &&
           so->so_proto->pr_protocol == IPPROTO_TCP) {
               MGET(m, M_WAIT, MT_SOOPTS);
               *mtod(m, int *) = 1;
               m->m_len = sizeof(int);
               sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m);
       }
       so->so_rcv.sb_flags &= ~SB_NOINTR;
       so->so_rcv.sb_timeo = 0;
       so->so_snd.sb_flags &= ~SB_NOINTR;
       so->so_snd.sb_timeo = 0;
       if (tslp)
               slp = tslp;
       else {
               slp = (struct nfssvc_sock *)
                       malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK);
               printf("Alloc nfssvc_sock 0x%x\n", slp);
               bzero((caddr_t)slp, sizeof (struct nfssvc_sock));
               slp->ns_prev = nfssvc_sockhead.ns_prev;
               slp->ns_prev->ns_next = slp;
               slp->ns_next = &nfssvc_sockhead;
               nfssvc_sockhead.ns_prev = slp;
               slp->ns_lrunext = slp->ns_lruprev = (struct nfsuid *)slp;
       }
       slp->ns_so = so;
       slp->ns_nam = mynam;
       fp->f_count++;
       slp->ns_fp = fp;
       s = splnet();
       so->so_upcallarg = (caddr_t)slp;
       so->so_upcall = nfsrv_rcv;
       slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
       nfsrv_wakenfsd(slp);
       splx(s);
       return (0);
}

/*
* Called by nfssvc() for nfsds. Just loops around servicing rpc requests
* until it is killed by a signal.
*/
nfssvc_nfsd(nsd, argp, p)
       struct nfsd_srvargs *nsd;
       caddr_t argp;
       struct proc *p;
{
       register struct mbuf *m, *nam2;
       register int siz;
       register struct nfssvc_sock *slp;
       register struct socket *so;
       register int *solockp;
       struct nfssvc_sock *oslp;
       struct nfsd *nd = nsd->nsd_nfsd;
       struct mbuf *mreq, *nam;
       int error, cacherep, s;
       int sotype;

       s = splnet();
       if (nd == (struct nfsd *)0) {
               nsd->nsd_nfsd = nd = (struct nfsd *)
                       malloc(sizeof (struct nfsd), M_NFSD, M_WAITOK);
               bzero((caddr_t)nd, sizeof (struct nfsd));
               nd->nd_procp = p;
               nd->nd_cr.cr_ref = 1;
               insque(nd, &nfsd_head);
               nfs_numnfsd++;
       }
       /*
        * Loop getting rpc requests until SIGKILL.
        */
       for (;;) {
               if ((nd->nd_flag & NFSD_REQINPROG) == 0) {
                       while (nd->nd_slp == (struct nfssvc_sock *)0 &&
                                (nfsd_head.nd_flag & NFSD_CHECKSLP) == 0) {
                               nd->nd_flag |= NFSD_WAITING;
                               nfsd_waiting++;
                               error = tsleep((caddr_t)nd, PSOCK | PCATCH, "nfsd", 0);
                               nfsd_waiting--;
                               if (error)
                                       goto done;
                       }
                       if (nd->nd_slp == (struct nfssvc_sock *)0 &&
                               (nfsd_head.nd_flag & NFSD_CHECKSLP)) {
                               slp = nfssvc_sockhead.ns_next;
                               while (slp != &nfssvc_sockhead) {
                                   if ((slp->ns_flag & (SLP_VALID | SLP_DOREC))
                                       == (SLP_VALID | SLP_DOREC)) {
                                           slp->ns_flag &= ~SLP_DOREC;
                                           slp->ns_sref++;
                                           nd->nd_slp = slp;
                                           break;
                                   }
                                   slp = slp->ns_next;
                               }
                               if (slp == &nfssvc_sockhead)
                                       nfsd_head.nd_flag &= ~NFSD_CHECKSLP;
                       }
                       if ((slp = nd->nd_slp) == (struct nfssvc_sock *)0)
                               continue;
                       if (slp->ns_flag & SLP_VALID) {
                               if (slp->ns_flag & SLP_DISCONN)
                                       nfsrv_zapsock(slp);
                               else if (slp->ns_flag & SLP_NEEDQ) {
                                       slp->ns_flag &= ~SLP_NEEDQ;
                                       (void) nfs_sndlock(&slp->ns_solock,
                                               (struct nfsreq *)0);
                                       nfsrv_rcv(slp->ns_so, (caddr_t)slp,
                                               M_WAIT);
                                       nfs_sndunlock(&slp->ns_solock);
                               }
                               error = nfsrv_dorec(slp, nd);
                               nd->nd_flag |= NFSD_REQINPROG;
                       }
               } else {
                       error = 0;
                       slp = nd->nd_slp;
               }
               if (error || (slp->ns_flag & SLP_VALID) == 0) {
                       nd->nd_slp = (struct nfssvc_sock *)0;
                       nd->nd_flag &= ~NFSD_REQINPROG;
                       nfsrv_slpderef(slp);
                       continue;
               }
               splx(s);
               so = slp->ns_so;
               sotype = so->so_type;

               /*
                * Check to see if authorization is needed.
                */
               if (nd->nd_flag & NFSD_NEEDAUTH) {
                       nd->nd_flag &= ~NFSD_NEEDAUTH;
                       nsd->nsd_uid = nd->nd_cr.cr_uid;
                       nsd->nsd_haddr =
                           mtod(slp->ns_nam, struct sockaddr_in *)->sin_addr.s_addr;
                       nsd->nsd_authlen = nd->nd_authlen;
                       (void) copyout(nd->nd_authstr, nsd->nsd_authstr,
                                nd->nd_authlen);
                       (void) copyout((caddr_t)nsd, argp, sizeof (*nsd));
                       return (ENEEDAUTH);
               }
               if (so->so_proto->pr_flags & PR_CONNREQUIRED)
                       solockp = &slp->ns_solock;
               else
                       solockp = (int *)0;
               /*
                * nam == nam2 for connectionless protocols such as UDP
                * nam2 == NULL for connection based protocols to disable
                *    recent request caching.
                */
               nam2 = nd->nd_nam;

               if (nam2) {
                       nam = nam2;
                       cacherep = nfsrv_getcache(nam2, nd, &mreq);
               } else {
                       nam = slp->ns_nam;
                       cacherep = RC_DOIT;
               }

               /*
                * Check for just starting up for NQNFS and send
                * fake "try again later" replies to the NQNFS clients.
                */
               if (notstarted && nqnfsstarttime <= time.tv_sec) {
                       if (modify_flag) {
                               nqnfsstarttime = time.tv_sec + nqsrv_writeslack;
                               modify_flag = 0;
                       } else
                               notstarted = 0;
               }
               if (notstarted) {
                       if (nd->nd_nqlflag == NQL_NOVAL)
                               cacherep = RC_DROPIT;
                       else if (nd->nd_procnum != NFSPROC_WRITE) {
                               nd->nd_procnum = NFSPROC_NOOP;
                               nd->nd_repstat = NQNFS_TRYLATER;
                               cacherep = RC_DOIT;
                       } else
                               modify_flag = 1;
               } else if (nd->nd_flag & NFSD_AUTHFAIL) {
                       nd->nd_flag &= ~NFSD_AUTHFAIL;
                       nd->nd_procnum = NFSPROC_NOOP;
                       nd->nd_repstat = NQNFS_AUTHERR;
                       cacherep = RC_DOIT;
               }

               switch (cacherep) {
               case RC_DOIT:
                       error = (*(nfsrv_procs[nd->nd_procnum]))(nd,
                               nd->nd_mrep, nd->nd_md, nd->nd_dpos, &nd->nd_cr,
                               nam, &mreq);
                       if (nd->nd_cr.cr_ref != 1) {
                               printf("nfssvc cref=%d\n", nd->nd_cr.cr_ref);
                               panic("nfssvc cref");
                       }
                       if (error) {
                               if (nd->nd_procnum != NQNFSPROC_VACATED)
                                       nfsstats.srv_errs++;
                               if (nam2) {
                                       nfsrv_updatecache(nam2, nd, FALSE, mreq);
                                       m_freem(nam2);
                               }
                               break;
                       }
                       nfsstats.srvrpccnt[nd->nd_procnum]++;
                       if (nam2)
                               nfsrv_updatecache(nam2, nd, TRUE, mreq);
                       nd->nd_mrep = (struct mbuf *)0;
               case RC_REPLY:
                       m = mreq;
                       siz = 0;
                       while (m) {
                               siz += m->m_len;
                               m = m->m_next;
                       }
                       if (siz <= 0 || siz > NFS_MAXPACKET) {
                               printf("mbuf siz=%d\n",siz);
                               panic("Bad nfs svc reply");
                       }
                       m = mreq;
                       m->m_pkthdr.len = siz;
                       m->m_pkthdr.rcvif = (struct ifnet *)0;
                       /*
                        * For stream protocols, prepend a Sun RPC
                        * Record Mark.
                        */
                       if (sotype == SOCK_STREAM) {
                               M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
                               *mtod(m, u_long *) = htonl(0x80000000 | siz);
                       }
                       if (solockp)
                               (void) nfs_sndlock(solockp, (struct nfsreq *)0);
                       if (slp->ns_flag & SLP_VALID)
                           error = nfs_send(so, nam2, m, (struct nfsreq *)0);
                       else {
                           error = EPIPE;
                           m_freem(m);
                       }
                       if (nam2)
                               MFREE(nam2, m);
                       if (nd->nd_mrep)
                               m_freem(nd->nd_mrep);
                       if (error == EPIPE)
                               nfsrv_zapsock(slp);
                       if (solockp)
                               nfs_sndunlock(solockp);
                       if (error == EINTR || error == ERESTART) {
                               nfsrv_slpderef(slp);
                               s = splnet();
                               goto done;
                       }
                       break;
               case RC_DROPIT:
                       m_freem(nd->nd_mrep);
                       m_freem(nam2);
                       break;
               };
               s = splnet();
               if (nfsrv_dorec(slp, nd)) {
                       nd->nd_flag &= ~NFSD_REQINPROG;
                       nd->nd_slp = (struct nfssvc_sock *)0;
                       nfsrv_slpderef(slp);
               }
#ifdef DIAGNOSTIC
               if (p->p_spare[0])
                       panic("nfssvc: M_NAMEI");
               if (p->p_spare[1])
                       panic("nfssvc: STARTSAVE");
#endif
       }
done:
       remque(nd);
       splx(s);
       free((caddr_t)nd, M_NFSD);
       nsd->nsd_nfsd = (struct nfsd *)0;
       if (--nfs_numnfsd == 0)
               nfsrv_init(TRUE);       /* Reinitialize everything */
       return (error);
}

/*
* Asynchronous I/O daemons for client nfs.
* These babies just pretend to be disk interrupt service routines.
* They are mainly here for read ahead/write behind.
* Never returns unless it fails or gets killed.
*/
nfssvc_iod(p)
       struct proc *p;
{
       register struct buf *bp, *dp;
       register int i, myiod;
       int error = 0;

       /*
        * Assign my position or return error if too many already running
        */
       myiod = -1;
       for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
               if (nfs_asyncdaemon[i] == 0) {
                       nfs_asyncdaemon[i]++;
                       myiod = i;
                       break;
               }
       if (myiod == -1)
               return (EBUSY);
       nfs_numasync++;
       /*
        * Just loop around doin our stuff until SIGKILL
        */
       for (;;) {
               while (nfs_bufq.qe_next == NULL && error == 0) {
                       nfs_iodwant[myiod] = p;
                       error = tsleep((caddr_t)&nfs_iodwant[myiod],
                               PWAIT | PCATCH, "nfsidl", 0);
                       nfs_iodwant[myiod] = (struct proc *)0;
               }
               while ((bp = nfs_bufq.qe_next) != NULL) {
                       /* Take one off the front of the list */
                       queue_remove(&nfs_bufq, bp, struct buf *, b_freelist);
                       (void) nfs_doio(bp, (struct proc *)0);
               }
               if (error) {
                       nfs_asyncdaemon[myiod] = 0;
                       nfs_numasync--;
                       return (error);
               }
       }
}

/*
* Shut down a socket associated with an nfssvc_sock structure.
* Should be called with the send lock set, if required.
* The trick here is to increment the sref at the start, so that the nfsds
* will stop using it and clear ns_flag at the end so that it will not be
* reassigned during cleanup.
*/
nfsrv_zapsock(slp)
       register struct nfssvc_sock *slp;
{
       register struct nfsuid *nuidp, *onuidp;
       register int i;
       struct socket *so;
       struct file *fp;
       struct mbuf *m;

       slp->ns_flag &= ~SLP_ALLFLAGS;
       if (fp = slp->ns_fp) {
               slp->ns_fp = (struct file *)0;
               so = slp->ns_so;
               so->so_upcall = NULL;
               soshutdown(so, 2);
               closef(fp, (struct proc *)0);
               if (slp->ns_nam)
                       MFREE(slp->ns_nam, m);
               m_freem(slp->ns_raw);
               m_freem(slp->ns_rec);
               nuidp = slp->ns_lrunext;
               while (nuidp != (struct nfsuid *)slp) {
                       onuidp = nuidp;
                       nuidp = nuidp->nu_lrunext;
                       free((caddr_t)onuidp, M_NFSUID);
               }
               slp->ns_lrunext = slp->ns_lruprev = (struct nfsuid *)slp;
               for (i = 0; i < NUIDHASHSIZ; i++)
                       slp->ns_uidh[i] = (struct nfsuid *)0;
       }
}

/*
* Get an authorization string for the uid by having the mount_nfs sitting
* on this mount point porpous out of the kernel and do it.
*/
nfs_getauth(nmp, rep, cred, auth_type, auth_str, auth_len)
       register struct nfsmount *nmp;
       struct nfsreq *rep;
       struct ucred *cred;
       int *auth_type;
       char **auth_str;
       int *auth_len;
{
       int error = 0;

       while ((nmp->nm_flag & NFSMNT_WAITAUTH) == 0) {
               nmp->nm_flag |= NFSMNT_WANTAUTH;
               (void) tsleep((caddr_t)&nmp->nm_authtype, PSOCK,
                       "nfsauth1", 2 * hz);
               if (error = nfs_sigintr(nmp, rep, rep->r_procp)) {
                       nmp->nm_flag &= ~NFSMNT_WANTAUTH;
                       return (error);
               }
       }
       nmp->nm_flag &= ~(NFSMNT_WAITAUTH | NFSMNT_WANTAUTH);
       nmp->nm_authstr = *auth_str = (char *)malloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
       nmp->nm_authuid = cred->cr_uid;
       wakeup((caddr_t)&nmp->nm_authstr);

       /*
        * And wait for mount_nfs to do its stuff.
        */
       while ((nmp->nm_flag & NFSMNT_HASAUTH) == 0 && error == 0) {
               (void) tsleep((caddr_t)&nmp->nm_authlen, PSOCK,
                       "nfsauth2", 2 * hz);
               error = nfs_sigintr(nmp, rep, rep->r_procp);
       }
       if (nmp->nm_flag & NFSMNT_AUTHERR) {
               nmp->nm_flag &= ~NFSMNT_AUTHERR;
               error = EAUTH;
       }
       if (error)
               free((caddr_t)*auth_str, M_TEMP);
       else {
               *auth_type = nmp->nm_authtype;
               *auth_len = nmp->nm_authlen;
       }
       nmp->nm_flag &= ~NFSMNT_HASAUTH;
       nmp->nm_flag |= NFSMNT_WAITAUTH;
       if (nmp->nm_flag & NFSMNT_WANTAUTH) {
               nmp->nm_flag &= ~NFSMNT_WANTAUTH;
               wakeup((caddr_t)&nmp->nm_authtype);
       }
       return (error);
}

/*
* Derefence a server socket structure. If it has no more references and
* is no longer valid, you can throw it away.
*/
void
nfsrv_slpderef(slp)
       register struct nfssvc_sock *slp;
{
       if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) {
#ifdef NOTYET
               slp->ns_prev->ns_next = slp->ns_next;
               slp->ns_next->ns_prev = slp->ns_prev;
               free((caddr_t)slp, M_NFSSVC);
#else
               if (slp->ns_flag & SLP_DEREFFREE)
                       panic("deref dup free 0x%x of deref free\n", slp);
               else {
                       slp->ns_prev->ns_next = slp->ns_next;
                       slp->ns_next->ns_prev = slp->ns_prev;
               }
               if (slp->ns_flag & SLP_CLRFREE)
                       panic("deref dup free 0x%x of clrall free\n", slp);
               slp->ns_flag |= SLP_DEREFFREE;
               printf("Free deref sock 0x%x\n", slp);
#endif
       }
}

/*
* Initialize the data structures for the server.
* Handshake with any new nfsds starting up to avoid any chance of
* corruption.
*/
void
nfsrv_init(terminating)
       int terminating;
{
       register struct nfssvc_sock *slp;
       struct nfssvc_sock *oslp;

       if (nfssvc_sockhead.ns_flag & SLP_INIT)
               panic("nfsd init");
       nfssvc_sockhead.ns_flag |= SLP_INIT;
       if (terminating) {
               slp = nfssvc_sockhead.ns_next;
               while (slp != &nfssvc_sockhead) {
                       if (slp->ns_flag & SLP_VALID)
                               nfsrv_zapsock(slp);
                       slp->ns_next->ns_prev = slp->ns_prev;
                       slp->ns_prev->ns_next = slp->ns_next;
                       oslp = slp;
                       slp = slp->ns_next;
#ifdef NOTYET
                       free((caddr_t)oslp, M_NFSSVC);
#else
                       if (oslp->ns_flag & SLP_DEREFFREE)
                               panic("clrall dup free 0x%x of deref free\n",
                                       oslp);
                       if (oslp->ns_flag & SLP_CLRFREE)
                               panic("clrall dup free 0x%x of clrall free\n",
                                       oslp);
                       oslp->ns_flag |= SLP_CLRFREE;
                       printf("Free all socks 0x%x\n", oslp);
#endif
               }
               nfsrv_cleancache();     /* And clear out server cache */
       }
       nfs_udpsock = (struct nfssvc_sock *)
           malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK);
       printf("Alloc nfs_udpsock 0x%x\n", nfs_udpsock);
       bzero((caddr_t)nfs_udpsock, sizeof (struct nfssvc_sock));
       nfs_cltpsock = (struct nfssvc_sock *)
           malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK);
       printf("Alloc nfs_cltpsock 0x%x\n", nfs_cltpsock);
       bzero((caddr_t)nfs_cltpsock, sizeof (struct nfssvc_sock));
       nfssvc_sockhead.ns_next = nfs_udpsock;
       nfs_udpsock->ns_next = nfs_cltpsock;
       nfs_cltpsock->ns_next = &nfssvc_sockhead;
       nfssvc_sockhead.ns_prev = nfs_cltpsock;
       nfs_cltpsock->ns_prev = nfs_udpsock;
       nfs_udpsock->ns_prev = &nfssvc_sockhead;
       nfs_udpsock->ns_lrunext = nfs_udpsock->ns_lruprev =
               (struct nfsuid *)nfs_udpsock;
       nfs_cltpsock->ns_lrunext = nfs_cltpsock->ns_lruprev =
               (struct nfsuid *)nfs_cltpsock;
       nfsd_head.nd_next = nfsd_head.nd_prev = &nfsd_head;
       nfsd_head.nd_flag = 0;
       nfssvc_sockhead.ns_flag &= ~SLP_INIT;
       if (nfssvc_sockhead.ns_flag & SLP_WANTINIT) {
               nfssvc_sockhead.ns_flag &= ~SLP_WANTINIT;
               wakeup((caddr_t)&nfssvc_sockhead);
       }
}