[unix-history] / usr / src / sys.386bsd / 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.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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_syscalls.c	7.26 (Berkeley) 4/16/91
 */

#include "param.h"
#include "systm.h"
#include "kernel.h"
#include "file.h"
#include "stat.h"
#include "namei.h"
#include "vnode.h"
#include "mount.h"
#include "proc.h"
#include "malloc.h"
#include "buf.h"
#include "mbuf.h"
#include "socket.h"
#include "socketvar.h"
#include "domain.h"
#include "protosw.h"

#include "../netinet/in.h"
#include "../netinet/tcp.h"

#include "nfsv2.h"
#include "nfs.h"
#include "nfsrvcache.h"

/* Global defs. */
extern u_long nfs_prog, nfs_vers;
extern int (*nfsrv_procs[NFS_NPROCS])();
extern struct buf nfs_bqueue;
extern int nfs_numasync;
extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
extern int nfs_tcpnodelay;
struct mbuf *nfs_compress();

#define	TRUE	1
#define	FALSE	0

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

/*
 * Get file handle system call
 */
/* ARGSUSED */
getfh(p, uap, retval)
	struct proc *p;
	register struct args {
		char	*fname;
		fhandle_t *fhp;
	} *uap;
	int *retval;
{
	register struct nameidata *ndp;
	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);
	ndp = &nd;
	ndp->ni_nameiop = LOOKUP | LOCKLEAF | FOLLOW;
	ndp->ni_segflg = UIO_USERSPACE;
	ndp->ni_dirp = uap->fname;
	if (error = namei(ndp, p))
		return (error);
	vp = ndp->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);
}

/*
 * Nfs server psuedo system call for the nfsd's
 * Never returns unless it fails or gets killed
 */
/* ARGSUSED */
nfssvc(p, uap, retval)
	struct proc *p;
	register struct args {
		int s;
		caddr_t mskval;
		int msklen;
		caddr_t mtchval;
		int mtchlen;
	} *uap;
	int *retval;
{
	register struct mbuf *m;
	register int siz;
	register struct ucred *cr;
	struct file *fp;
	struct mbuf *mreq, *mrep, *nam, *md;
	struct mbuf msk, mtch;
	struct socket *so;
	caddr_t dpos;
	int procid, repstat, error, cacherep, wascomp;
	u_long retxid;

	/*
	 * Must be super user
	 */
	if (error = suser(p->p_ucred, &p->p_acflag))
		return (error);
	if (error = getsock(p->p_fd, uap->s, &fp))
		return (error);
	so = (struct socket *)fp->f_data;
	if (sosendallatonce(so))
		siz = NFS_MAXPACKET;
	else
		siz = NFS_MAXPACKET + sizeof(u_long);
	if (error = soreserve(so, siz, siz))
		goto bad;
	if (error = sockargs(&nam, uap->mskval, uap->msklen, MT_SONAME))
		goto bad;
	bcopy((caddr_t)nam, (caddr_t)&msk, sizeof (struct mbuf));
	msk.m_data = msk.m_dat;
	m_freem(nam);
	if (error = sockargs(&nam, uap->mtchval, uap->mtchlen, MT_SONAME))
		goto bad;
	bcopy((caddr_t)nam, (caddr_t)&mtch, sizeof (struct mbuf));
	mtch.m_data = mtch.m_dat;
	m_freem(nam);

	/* Copy the cred so others don't see changes */
	cr = p->p_ucred = crcopy(p->p_ucred);

	/*
	 * 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_proto->pr_flags & PR_CONNREQUIRED) {
		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 &&
	    nfs_tcpnodelay) {
		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;

	/*
	 * Just loop around doin our stuff until SIGKILL
	 */
	for (;;) {
		if (error = nfs_getreq(so, nfs_prog, nfs_vers, NFS_NPROCS-1,
		   &nam, &mrep, &md, &dpos, &retxid, &procid, cr,
		   &msk, &mtch, &wascomp)) {
			if (nam)
				m_freem(nam);
			if (error == EPIPE || error == EINTR ||
			    error == ERESTART) {
				error = 0;
				goto bad;
			}
			so->so_error = 0;
			continue;
		}

		if (nam)
			cacherep = nfsrv_getcache(nam, retxid, procid, &mreq);
		else
			cacherep = RC_DOIT;
		switch (cacherep) {
		case RC_DOIT:
			if (error = (*(nfsrv_procs[procid]))(mrep, md, dpos,
				cr, retxid, &mreq, &repstat, p)) {
				nfsstats.srv_errs++;
				if (nam) {
					nfsrv_updatecache(nam, retxid, procid,
						FALSE, repstat, mreq);
					m_freem(nam);
				}
				break;
			}
			nfsstats.srvrpccnt[procid]++;
			if (nam)
				nfsrv_updatecache(nam, retxid, procid, TRUE,
					repstat, mreq);
			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");
			}
			mreq->m_pkthdr.len = siz;
			mreq->m_pkthdr.rcvif = (struct ifnet *)0;
			if (wascomp && compressreply[procid]) {
				mreq = nfs_compress(mreq);
				siz = mreq->m_pkthdr.len;
			}
			/*
			 * For non-atomic protocols, prepend a Sun RPC
			 * Record Mark.
			 */
			if (!sosendallatonce(so)) {
				M_PREPEND(mreq, sizeof(u_long), M_WAIT);
				*mtod(mreq, u_long *) = htonl(0x80000000 | siz);
			}
			error = nfs_send(so, nam, mreq, (struct nfsreq *)0);
			if (nam)
				m_freem(nam);
			if (mrep)
				m_freem(mrep);
			if (error) {
				if (error == EPIPE || error == EINTR ||
				    error == ERESTART)
					goto bad;
				so->so_error = 0;
			}
			break;
		case RC_DROPIT:
			m_freem(mrep);
			m_freem(nam);
			break;
		};
	}
bad:
	return (error);
}

/*
 * Nfs pseudo system call for asynchronous i/o daemons.
 * These babies just pretend to be disk interrupt service routines
 * for client nfs. They are mainly here for read ahead/write behind.
 * Never returns unless it fails or gets killed
 */
/* ARGSUSED */
async_daemon(p, uap, retval)
	struct proc *p;
	struct args *uap;
	int *retval;
{
	register struct buf *bp, *dp;
	register int i, myiod;
	int error;

	/*
	 * Must be super user
	 */
	if (error = suser(p->p_ucred, &p->p_acflag))
		return (error);
	/*
	 * 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++;
	dp = &nfs_bqueue;
	/*
	 * Just loop around doin our stuff until SIGKILL
	 */
	for (;;) {
		while (dp->b_actf == 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 (dp->b_actf != NULL) {
			/* Take one off the end of the list */
			bp = dp->b_actl;
			if (bp->b_actl == dp) {
				dp->b_actf = dp->b_actl = (struct buf *)0;
			} else {
				dp->b_actl = bp->b_actl;
				bp->b_actl->b_actf = dp;
			}
			(void) nfs_doio(bp);
		}
		if (error) {
			nfs_asyncdaemon[myiod] = 0;
			nfs_numasync--;
			return (error);
		}
	}
}
Commit	Line	Data
b688fc87 WJ	1	/*
	2	* Copyright (c) 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Rick Macklem at The University of Guelph.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*
	36	* @(#)nfs_syscalls.c 7.26 (Berkeley) 4/16/91
	37	*/
	38
	39	#include "param.h"
	40	#include "systm.h"
	41	#include "kernel.h"
	42	#include "file.h"
	43	#include "stat.h"
	44	#include "namei.h"
	45	#include "vnode.h"
	46	#include "mount.h"
	47	#include "proc.h"
	48	#include "malloc.h"
	49	#include "buf.h"
	50	#include "mbuf.h"
	51	#include "socket.h"
	52	#include "socketvar.h"
	53	#include "domain.h"
	54	#include "protosw.h"
	55
	56	#include "../netinet/in.h"
	57	#include "../netinet/tcp.h"
	58
	59	#include "nfsv2.h"
	60	#include "nfs.h"
	61	#include "nfsrvcache.h"
	62
	63	/* Global defs. */
	64	extern u_long nfs_prog, nfs_vers;
65	extern int (*nfsrv_procs[NFS_NPROCS])();
66	extern struct buf nfs_bqueue;
67	extern int nfs_numasync;
68	extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
69	extern int nfs_tcpnodelay;
70	struct mbuf *nfs_compress();
71
72	#define TRUE 1
73	#define FALSE 0
74
75	static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON];
76	static int compressreply[NFS_NPROCS] = {
77	FALSE,
78	TRUE,
79	TRUE,
80	FALSE,
81	TRUE,
82	TRUE,
83	FALSE,
84	FALSE,
85	TRUE,
86	TRUE,
87	TRUE,
88	TRUE,
89	TRUE,
90	TRUE,
91	TRUE,
92	TRUE,
93	TRUE,
94	TRUE,
95	};
96	/*
97	* NFS server system calls
98	* getfh() lives here too, but maybe should move to kern/vfs_syscalls.c
99	*/
100
101	/*
102	* Get file handle system call
103	*/
104	/* ARGSUSED */
105	getfh(p, uap, retval)
106	struct proc *p;
107	register struct args {
108	char *fname;
109	fhandle_t *fhp;
110	} *uap;
111	int *retval;
112	{
113	register struct nameidata *ndp;
114	register struct vnode *vp;
115	fhandle_t fh;
116	int error;
117	struct nameidata nd;
118
119	/*
120	* Must be super user
121	*/
122	if (error = suser(p->p_ucred, &p->p_acflag))
123	return (error);
124	ndp = &nd;
125	ndp->ni_nameiop = LOOKUP \| LOCKLEAF \| FOLLOW;
126	ndp->ni_segflg = UIO_USERSPACE;
127	ndp->ni_dirp = uap->fname;
128	if (error = namei(ndp, p))
129	return (error);
130	vp = ndp->ni_vp;
131	bzero((caddr_t)&fh, sizeof(fh));
132	fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
133	error = VFS_VPTOFH(vp, &fh.fh_fid);
134	vput(vp);
135	if (error)
136	return (error);
137	error = copyout((caddr_t)&fh, (caddr_t)uap->fhp, sizeof (fh));
138	return (error);
139	}
140
141	/*
142	* Nfs server psuedo system call for the nfsd's
143	* Never returns unless it fails or gets killed
144	*/
145	/* ARGSUSED */
146	nfssvc(p, uap, retval)
147	struct proc *p;
148	register struct args {
149	int s;
150	caddr_t mskval;
151	int msklen;
152	caddr_t mtchval;
153	int mtchlen;
154	} *uap;
155	int *retval;
156	{
157	register struct mbuf *m;
158	register int siz;
159	register struct ucred *cr;
160	struct file *fp;
161	struct mbuf mreq, mrep, nam, md;
162	struct mbuf msk, mtch;
163	struct socket *so;
164	caddr_t dpos;
165	int procid, repstat, error, cacherep, wascomp;
166	u_long retxid;
167
168	/*
169	* Must be super user
170	*/
171	if (error = suser(p->p_ucred, &p->p_acflag))
172	return (error);
173	if (error = getsock(p->p_fd, uap->s, &fp))
174	return (error);
175	so = (struct socket *)fp->f_data;
176	if (sosendallatonce(so))
177	siz = NFS_MAXPACKET;
178	else
179	siz = NFS_MAXPACKET + sizeof(u_long);
180	if (error = soreserve(so, siz, siz))
181	goto bad;
182	if (error = sockargs(&nam, uap->mskval, uap->msklen, MT_SONAME))
183	goto bad;
184	bcopy((caddr_t)nam, (caddr_t)&msk, sizeof (struct mbuf));
185	msk.m_data = msk.m_dat;
186	m_freem(nam);
187	if (error = sockargs(&nam, uap->mtchval, uap->mtchlen, MT_SONAME))
188	goto bad;
189	bcopy((caddr_t)nam, (caddr_t)&mtch, sizeof (struct mbuf));
190	mtch.m_data = mtch.m_dat;
191	m_freem(nam);
192
193	/* Copy the cred so others don't see changes */
194	cr = p->p_ucred = crcopy(p->p_ucred);
195
196	/*
197	* Set protocol specific options { for now TCP only } and
198	* reserve some space. For datagram sockets, this can get called
199	* repeatedly for the same socket, but that isn't harmful.
200	*/
201	if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
202	MGET(m, M_WAIT, MT_SOOPTS);
203	mtod(m, int ) = 1;
204	m->m_len = sizeof(int);
205	sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m);
206	}
207	if (so->so_proto->pr_domain->dom_family == AF_INET &&
208	so->so_proto->pr_protocol == IPPROTO_TCP &&
209	nfs_tcpnodelay) {
210	MGET(m, M_WAIT, MT_SOOPTS);
211	mtod(m, int ) = 1;
212	m->m_len = sizeof(int);
213	sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m);
214	}
215	so->so_rcv.sb_flags &= ~SB_NOINTR;
216	so->so_rcv.sb_timeo = 0;
217	so->so_snd.sb_flags &= ~SB_NOINTR;
218	so->so_snd.sb_timeo = 0;
219
220	/*
221	* Just loop around doin our stuff until SIGKILL
222	*/
223	for (;;) {
224	if (error = nfs_getreq(so, nfs_prog, nfs_vers, NFS_NPROCS-1,
225	&nam, &mrep, &md, &dpos, &retxid, &procid, cr,
226	&msk, &mtch, &wascomp)) {
227	if (nam)
228	m_freem(nam);
229	if (error == EPIPE \|\| error == EINTR \|\|
230	error == ERESTART) {
231	error = 0;
232	goto bad;
233	}
234	so->so_error = 0;
235	continue;
236	}
237
238	if (nam)
239	cacherep = nfsrv_getcache(nam, retxid, procid, &mreq);
240	else
241	cacherep = RC_DOIT;
242	switch (cacherep) {
243	case RC_DOIT:
244	if (error = (*(nfsrv_procs[procid]))(mrep, md, dpos,
245	cr, retxid, &mreq, &repstat, p)) {
246	nfsstats.srv_errs++;
247	if (nam) {
248	nfsrv_updatecache(nam, retxid, procid,
249	FALSE, repstat, mreq);
250	m_freem(nam);
251	}
252	break;
253	}
254	nfsstats.srvrpccnt[procid]++;
255	if (nam)
256	nfsrv_updatecache(nam, retxid, procid, TRUE,
257	repstat, mreq);
258	mrep = (struct mbuf *)0;
259	case RC_REPLY:
260	m = mreq;
261	siz = 0;
262	while (m) {
263	siz += m->m_len;
264	m = m->m_next;
265	}
266	if (siz <= 0 \|\| siz > NFS_MAXPACKET) {
267	printf("mbuf siz=%d\n",siz);
268	panic("Bad nfs svc reply");
269	}
270	mreq->m_pkthdr.len = siz;
271	mreq->m_pkthdr.rcvif = (struct ifnet *)0;
272	if (wascomp && compressreply[procid]) {
273	mreq = nfs_compress(mreq);
274	siz = mreq->m_pkthdr.len;
275	}
276	/*
277	* For non-atomic protocols, prepend a Sun RPC
278	* Record Mark.
279	*/
280	if (!sosendallatonce(so)) {
281	M_PREPEND(mreq, sizeof(u_long), M_WAIT);
282	mtod(mreq, u_long ) = htonl(0x80000000 \| siz);
283	}
284	error = nfs_send(so, nam, mreq, (struct nfsreq *)0);
285	if (nam)
286	m_freem(nam);
287	if (mrep)
288	m_freem(mrep);
289	if (error) {
290	if (error == EPIPE \|\| error == EINTR \|\|
291	error == ERESTART)
292	goto bad;
293	so->so_error = 0;
294	}
295	break;
296	case RC_DROPIT:
297	m_freem(mrep);
298	m_freem(nam);
299	break;
300	};
301	}
302	bad:
303	return (error);
304	}
305
306	/*
307	* Nfs pseudo system call for asynchronous i/o daemons.
308	* These babies just pretend to be disk interrupt service routines
309	* for client nfs. They are mainly here for read ahead/write behind.
310	* Never returns unless it fails or gets killed
311	*/
312	/* ARGSUSED */
313	async_daemon(p, uap, retval)
314	struct proc *p;
315	struct args *uap;
316	int *retval;
317	{
318	register struct buf bp, dp;
319	register int i, myiod;
320	int error;
321
322	/*
323	* Must be super user
324	*/
325	if (error = suser(p->p_ucred, &p->p_acflag))
326	return (error);
327	/*
328	* Assign my position or return error if too many already running
329	*/
330	myiod = -1;
331	for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
332	if (nfs_asyncdaemon[i] == 0) {
333	nfs_asyncdaemon[i]++;
334	myiod = i;
335	break;
336	}
337	if (myiod == -1)
338	return (EBUSY);
339	nfs_numasync++;
340	dp = &nfs_bqueue;
341	/*
342	* Just loop around doin our stuff until SIGKILL
343	*/
344	for (;;) {
345	while (dp->b_actf == NULL && error == 0) {
346	nfs_iodwant[myiod] = p;
347	error = tsleep((caddr_t)&nfs_iodwant[myiod],
348	PWAIT \| PCATCH, "nfsidl", 0);
349	nfs_iodwant[myiod] = (struct proc *)0;
350	}
351	while (dp->b_actf != NULL) {
352	/* Take one off the end of the list */
353	bp = dp->b_actl;
354	if (bp->b_actl == dp) {
355	dp->b_actf = dp->b_actl = (struct buf *)0;
356	} else {
357	dp->b_actl = bp->b_actl;
358	bp->b_actl->b_actf = dp;
359	}
360	(void) nfs_doio(bp);
361	}
362	if (error) {
363	nfs_asyncdaemon[myiod] = 0;
364	nfs_numasync--;
365	return (error);
366	}
367	}
368	}