2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
36 * @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/sysproto.h>
45 #include <sys/kernel.h>
46 #include <sys/sysctl.h>
48 #include <sys/filedesc.h>
49 #include <sys/vnode.h>
50 #include <sys/malloc.h>
51 #include <sys/mount.h>
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
58 #include <sys/domain.h>
59 #include <sys/protosw.h>
60 #include <sys/namei.h>
61 #include <sys/unistd.h>
62 #include <sys/kthread.h>
63 #include <sys/fcntl.h>
64 #include <sys/lockf.h>
65 #include <sys/mutex.h>
67 #include <netinet/in.h>
68 #include <netinet/tcp.h>
69 #include <nfs/xdr_subs.h>
70 #include <nfs/rpcv2.h>
71 #include <nfs/nfsproto.h>
72 #include <nfsclient/nfs.h>
73 #include <nfsclient/nfsm_subs.h>
74 #include <nfsclient/nfsmount.h>
75 #include <nfsclient/nfsnode.h>
76 #include <nfsclient/nfs_lock.h>
78 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
80 static void nfssvc_iod(void *);
82 static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON];
84 SYSCTL_DECL(_vfs_nfs);
86 /* Maximum number of seconds a nfsiod kthread will sleep before exiting */
87 static unsigned int nfs_iodmaxidle = 120;
88 SYSCTL_UINT(_vfs_nfs, OID_AUTO, iodmaxidle, CTLFLAG_RW, &nfs_iodmaxidle, 0, "");
90 /* Maximum number of nfsiod kthreads */
91 static unsigned int nfs_iodmax = 20;
93 /* Minimum number of nfsiod kthreads to keep as spares */
94 static unsigned int nfs_iodmin = 4;
97 sysctl_iodmin(SYSCTL_HANDLER_ARGS)
103 error = sysctl_handle_int(oidp, &newmin, 0, req);
104 if (error || (req->newptr == NULL))
106 if (newmin > nfs_iodmax)
109 if (nfs_numasync >= nfs_iodmin)
112 * If the current number of nfsiod is lower
113 * than the new minimum, create some more.
115 for (i = nfs_iodmin - nfs_numasync; i > 0; i--)
119 SYSCTL_PROC(_vfs_nfs, OID_AUTO, iodmin, CTLTYPE_UINT | CTLFLAG_RW, 0,
120 sizeof (nfs_iodmin), sysctl_iodmin, "IU", "");
124 sysctl_iodmax(SYSCTL_HANDLER_ARGS)
130 error = sysctl_handle_int(oidp, &newmax, 0, req);
131 if (error || (req->newptr == NULL))
133 if (newmax > NFS_MAXASYNCDAEMON)
136 if (nfs_numasync <= nfs_iodmax)
139 * If there are some asleep nfsiods that should
140 * exit, wakeup() them so that they check nfs_iodmax
141 * and exit. Those who are active will exit as
142 * soon as they finish I/O.
144 iod = nfs_numasync - 1;
145 for (i = 0; i < nfs_numasync - nfs_iodmax; i++) {
146 if (nfs_iodwant[iod])
147 wakeup((caddr_t)&nfs_iodwant[iod]);
152 SYSCTL_PROC(_vfs_nfs, OID_AUTO, iodmax, CTLTYPE_UINT | CTLFLAG_RW, 0,
153 sizeof (nfs_iodmax), sysctl_iodmax, "IU", "");
161 if (nfs_numasync >= nfs_iodmax)
164 for (i = 0; i < nfs_iodmax; i++)
165 if (nfs_asyncdaemon[i] == 0) {
166 nfs_asyncdaemon[i]++;
172 error = kthread_create(nfssvc_iod, nfs_asyncdaemon + i, NULL, RFHIGHPID,
173 "nfsiod %d", newiod);
181 nfsiod_setup(void *dummy)
186 TUNABLE_INT_FETCH("vfs.nfs.iodmin", &nfs_iodmin);
187 /* Silently limit the start number of nfsiod's */
188 if (nfs_iodmin > NFS_MAXASYNCDAEMON)
189 nfs_iodmin = NFS_MAXASYNCDAEMON;
191 for (i = 0; i < nfs_iodmin; i++) {
192 error = nfs_nfsiodnew();
194 panic("nfsiod_setup: nfs_nfsiodnew failed");
197 SYSINIT(nfsiod, SI_SUB_KTHREAD_IDLE, SI_ORDER_ANY, nfsiod_setup, NULL);
199 static int nfs_defect = 0;
200 SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, "");
203 nfsclnt(struct thread *td, struct nfsclnt_args *uap)
208 if ((uap->flag & NFSCLNT_LOCKDANS) != 0) {
209 error = copyin(uap->argp, &la, sizeof(la));
210 return (error != 0 ? error : nfslockdans(td, &la));
216 * Asynchronous I/O daemons for client nfs.
217 * They do read-ahead and write-behind operations on the block I/O cache.
218 * Returns if we hit the timeout defined by the iodmaxidle sysctl.
221 nfssvc_iod(void *instance)
224 struct nfsmount *nmp;
229 myiod = (int *)instance - nfs_asyncdaemon;
234 while (((nmp = nfs_iodmount[myiod]) == NULL
235 || !TAILQ_FIRST(&nmp->nm_bufq))
237 if (myiod >= nfs_iodmax)
241 nfs_iodwant[myiod] = curthread->td_proc;
242 nfs_iodmount[myiod] = NULL;
244 * Always keep at least nfs_iodmin kthreads.
246 timo = (myiod < nfs_iodmin) ? 0 : nfs_iodmaxidle * hz;
247 error = tsleep((caddr_t)&nfs_iodwant[myiod], PWAIT | PCATCH,
252 while ((bp = TAILQ_FIRST(&nmp->nm_bufq)) != NULL) {
253 /* Take one off the front of the list */
254 TAILQ_REMOVE(&nmp->nm_bufq, bp, b_freelist);
256 if (nmp->nm_bufqwant && nmp->nm_bufqlen <= nfs_numasync) {
257 nmp->nm_bufqwant = 0;
258 wakeup(&nmp->nm_bufq);
260 if (bp->b_iocmd == BIO_READ)
261 (void) nfs_doio(bp, bp->b_rcred, NULL);
263 (void) nfs_doio(bp, bp->b_wcred, NULL);
265 * If there are more than one iod on this mount, then defect
266 * so that the iods can be shared out fairly between the mounts
268 if (nfs_defect && nmp->nm_bufqiods > 1) {
270 ("nfssvc_iod: iod %d defecting from mount %p\n",
272 nfs_iodmount[myiod] = NULL;
279 nfs_asyncdaemon[myiod] = 0;
282 nfs_iodwant[myiod] = NULL;
283 nfs_iodmount[myiod] = NULL;
285 if ((error == 0) || (error == EWOULDBLOCK))
287 /* Abnormal termination */