1 /*
2 * Copyright (c) 1989, 1993, 1995
3 * The Regents of the University of California. 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 * %sccs.include.redist.c%
9 *
10 * @(#)nfs_vfsops.c 8.12 (Berkeley) 05/20/95
11 */
12
13 #include <sys/param.h>
14 #include <sys/conf.h>
15 #include <sys/ioctl.h>
16 #include <sys/signal.h>
17 #include <sys/proc.h>
18 #include <sys/namei.h>
19 #include <sys/vnode.h>
20 #include <sys/kernel.h>
21 #include <sys/mount.h>
22 #include <sys/buf.h>
23 #include <sys/mbuf.h>
24 #include <sys/socket.h>
25 #include <sys/socketvar.h>
26 #include <sys/systm.h>
27
28 #include <net/if.h>
29 #include <net/route.h>
30 #include <netinet/in.h>
31
32 #include <nfs/rpcv2.h>
33 #include <nfs/nfsproto.h>
34 #include <nfs/nfsnode.h>
35 #include <nfs/nfs.h>
36 #include <nfs/nfsmount.h>
37 #include <nfs/xdr_subs.h>
38 #include <nfs/nfsm_subs.h>
39 #include <nfs/nfsdiskless.h>
40 #include <nfs/nqnfs.h>
41
42 struct nfsstats nfsstats;
43 static int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t,
44 struct proc *);
45 extern int nfs_ticks;
46
47 /*
48 * nfs vfs operations.
49 */
50 struct vfsops nfs_vfsops = {
51 nfs_mount,
52 nfs_start,
53 nfs_unmount,
54 nfs_root,
55 nfs_quotactl,
56 nfs_statfs,
57 nfs_sync,
58 nfs_vget,
59 nfs_fhtovp,
60 nfs_vptofh,
61 nfs_init,
62 nfs_sysctl
63 };
64
65 /*
66 * This structure must be filled in by a primary bootstrap or bootstrap
67 * server for a diskless/dataless machine. It is initialized below just
68 * to ensure that it is allocated to initialized data (.data not .bss).
69 */
70 struct nfs_diskless nfs_diskless = { 0 };
71 int nfs_diskless_valid = 0;
72
73 void nfs_disconnect __P((struct nfsmount *));
74 void nfsargs_ntoh __P((struct nfs_args *));
75 int nfs_fsinfo __P((struct nfsmount *, struct vnode *, struct ucred *,
76 struct proc *));
77 static int nfs_mountdiskless __P((char *, char *, int, struct sockaddr_in *,
78 struct nfs_args *, struct proc *, struct vnode **, struct mount **));
79
80 /*
81 * nfs statfs call
82 */
83 int
nfs_statfs(mp,sbp,p)84 nfs_statfs(mp, sbp, p)
85 struct mount *mp;
86 register struct statfs *sbp;
87 struct proc *p;
88 {
89 register struct vnode *vp;
90 register struct nfs_statfs *sfp;
91 register caddr_t cp;
92 register u_long *tl;
93 register long t1, t2;
94 caddr_t bpos, dpos, cp2;
95 struct nfsmount *nmp = VFSTONFS(mp);
96 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
97 struct mbuf *mreq, *mrep, *md, *mb, *mb2;
98 struct ucred *cred;
99 struct nfsnode *np;
100 u_quad_t tquad;
101
102 #ifndef nolint
103 sfp = (struct nfs_statfs *)0;
104 #endif
105 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
106 if (error)
107 return (error);
108 vp = NFSTOV(np);
109 cred = crget();
110 cred->cr_ngroups = 1;
111 if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0)
112 (void)nfs_fsinfo(nmp, vp, cred, p);
113 nfsstats.rpccnt[NFSPROC_FSSTAT]++;
114 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
115 nfsm_fhtom(vp, v3);
116 nfsm_request(vp, NFSPROC_FSSTAT, p, cred);
117 if (v3)
118 nfsm_postop_attr(vp, retattr);
119 if (!error)
120 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
121 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize);
122 if (v3) {
123 sbp->f_bsize = NFS_FABLKSIZE;
124 fxdr_hyper(&sfp->sf_tbytes, &tquad);
125 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE));
126 fxdr_hyper(&sfp->sf_fbytes, &tquad);
127 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE));
128 fxdr_hyper(&sfp->sf_abytes, &tquad);
129 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE));
130 sbp->f_files = (fxdr_unsigned(long, sfp->sf_tfiles.nfsuquad[1])
131 & 0x7fffffff);
132 sbp->f_ffree = (fxdr_unsigned(long, sfp->sf_ffiles.nfsuquad[1])
133 & 0x7fffffff);
134 } else {
135 sbp->f_bsize = fxdr_unsigned(long, sfp->sf_bsize);
136 sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks);
137 sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree);
138 sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail);
139 sbp->f_files = 0;
140 sbp->f_ffree = 0;
141 }
142 if (sbp != &mp->mnt_stat) {
143 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
144 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
145 }
146 nfsm_reqdone;
147 vrele(vp);
148 crfree(cred);
149 return (error);
150 }
151
152 /*
153 * nfs version 3 fsinfo rpc call
154 */
155 int
nfs_fsinfo(nmp,vp,cred,p)156 nfs_fsinfo(nmp, vp, cred, p)
157 register struct nfsmount *nmp;
158 register struct vnode *vp;
159 struct ucred *cred;
160 struct proc *p;
161 {
162 register struct nfsv3_fsinfo *fsp;
163 register caddr_t cp;
164 register long t1, t2;
165 register u_long *tl, pref, max;
166 caddr_t bpos, dpos, cp2;
167 int error = 0, retattr;
168 struct mbuf *mreq, *mrep, *md, *mb, *mb2;
169
170 nfsstats.rpccnt[NFSPROC_FSINFO]++;
171 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
172 nfsm_fhtom(vp, 1);
173 nfsm_request(vp, NFSPROC_FSINFO, p, cred);
174 nfsm_postop_attr(vp, retattr);
175 if (!error) {
176 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
177 pref = fxdr_unsigned(u_long, fsp->fs_wtpref);
178 if (pref < nmp->nm_wsize)
179 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
180 ~(NFS_FABLKSIZE - 1);
181 max = fxdr_unsigned(u_long, fsp->fs_wtmax);
182 if (max < nmp->nm_wsize) {
183 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
184 if (nmp->nm_wsize == 0)
185 nmp->nm_wsize = max;
186 }
187 pref = fxdr_unsigned(u_long, fsp->fs_rtpref);
188 if (pref < nmp->nm_rsize)
189 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
190 ~(NFS_FABLKSIZE - 1);
191 max = fxdr_unsigned(u_long, fsp->fs_rtmax);
192 if (max < nmp->nm_rsize) {
193 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
194 if (nmp->nm_rsize == 0)
195 nmp->nm_rsize = max;
196 }
197 pref = fxdr_unsigned(u_long, fsp->fs_dtpref);
198 if (pref < nmp->nm_readdirsize)
199 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
200 ~(NFS_DIRBLKSIZ - 1);
201 if (max < nmp->nm_readdirsize) {
202 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
203 if (nmp->nm_readdirsize == 0)
204 nmp->nm_readdirsize = max;
205 }
206 nmp->nm_flag |= NFSMNT_GOTFSINFO;
207 }
208 nfsm_reqdone;
209 return (error);
210 }
211
212 /*
213 * Mount a remote root fs via. nfs. This depends on the info in the
214 * nfs_diskless structure that has been filled in properly by some primary
215 * bootstrap.
216 * It goes something like this:
217 * - do enough of "ifconfig" by calling ifioctl() so that the system
218 * can talk to the server
219 * - If nfs_diskless.mygateway is filled in, use that address as
220 * a default gateway.
221 * - hand craft the swap nfs vnode hanging off a fake mount point
222 * if swdevt[0].sw_dev == NODEV
223 * - build the rootfs mount point and call mountnfs() to do the rest.
224 */
225 int
nfs_mountroot()226 nfs_mountroot()
227 {
228 struct mount *mp, *swap_mp;
229 struct nfs_diskless *nd = &nfs_diskless;
230 struct socket *so;
231 struct vnode *vp;
232 struct proc *p = curproc; /* XXX */
233 int error, i;
234 u_long l;
235 char buf[128];
236
237 /*
238 * XXX time must be non-zero when we init the interface or else
239 * the arp code will wedge...
240 */
241 if (time.tv_sec == 0)
242 time.tv_sec = 1;
243
244 /*
245 * XXX splnet, so networks will receive...
246 */
247 splnet();
248
249 #ifdef notyet
250 /* Set up swap credentials. */
251 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid);
252 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid);
253 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) >
254 NGROUPS)
255 proc0.p_ucred->cr_ngroups = NGROUPS;
256 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++)
257 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]);
258 #endif
259
260 /*
261 * Do enough of ifconfig(8) so that the critical net interface can
262 * talk to the server.
263 */
264 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0);
265 if (error) {
266 printf("nfs_mountroot: socreate(%04x): %d",
267 nd->myif.ifra_addr.sa_family, error);
268 return (error);
269 }
270
271 /*
272 * We might not have been told the right interface, so we pass
273 * over the first ten interfaces of the same kind, until we get
274 * one of them configured.
275 */
276
277 for (i = strlen(nd->myif.ifra_name) - 1;
278 nd->myif.ifra_name[i] >= '0' &&
279 nd->myif.ifra_name[i] <= '9';
280 nd->myif.ifra_name[i] ++) {
281 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p);
282 if(!error)
283 break;
284 }
285 if (error) {
286 printf("nfs_mountroot: SIOCAIFADDR: %d", error);
287 return (error);
288 }
289 soclose(so);
290
291 /*
292 * If the gateway field is filled in, set it as the default route.
293 */
294 if (nd->mygateway.sin_len != 0) {
295 struct sockaddr_in mask, sin;
296
297 bzero((caddr_t)&mask, sizeof(mask));
298 sin = mask;
299 sin.sin_family = AF_INET;
300 sin.sin_len = sizeof(sin);
301 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin,
302 (struct sockaddr *)&nd->mygateway,
303 (struct sockaddr *)&mask,
304 RTF_UP | RTF_GATEWAY, (struct rtentry **)0);
305 if (error) {
306 printf("nfs_mountroot: RTM_ADD: %d", error);
307 return (error);
308 }
309 }
310
311 swap_mp = NULL;
312 if (nd->swap_nblks) {
313 /*
314 * Create a fake mount point just for the swap vnode so that the
315 * swap file can be on a different server from the rootfs.
316 */
317 nd->swap_args.fh = nd->swap_fh;
318 /*
319 * If using nfsv3_diskless, replace NFSX_V2FH with
320 * nd->swap_fhsize.
321 */
322 nd->swap_args.fhsize = NFSX_V2FH;
323 l = ntohl(nd->swap_saddr.sin_addr.s_addr);
324 sprintf(buf,"%ld.%ld.%ld.%ld:%s",
325 (l >> 24) & 0xff, (l >> 16) & 0xff,
326 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam);
327 printf("NFS SWAP: %s\n",buf);
328 if (error = nfs_mountdiskless(buf, "/swap", 0,
329 &nd->swap_saddr, &nd->swap_args, p, &vp, &swap_mp))
330 return (error);
331 vfs_unbusy(swap_mp, p);
332
333 for (i=0;swdevt[i].sw_dev != NODEV;i++) ;
334
335 /*
336 * Since the swap file is not the root dir of a file system,
337 * hack it to a regular file.
338 */
339 vp->v_type = VREG;
340 vp->v_flag = 0;
341 swapdev_vp = vp;
342 VREF(vp);
343 swdevt[i].sw_vp = vp;
344 swdevt[i].sw_nblks = nd->swap_nblks*2;
345
346 if (!swdevt[i].sw_nblks) {
347 swdevt[i].sw_nblks = 2048;
348 printf("defaulting to %d kbyte.\n",
349 swdevt[i].sw_nblks/2);
350 } else
351 printf("using %d kbyte.\n",swdevt[i].sw_nblks/2);
352 }
353
354 /*
355 * Create the rootfs mount point.
356 */
357 nd->root_args.fh = nd->root_fh;
358 /*
359 * If using nfsv3_diskless, replace NFSX_V2FH with nd->root_fhsize.
360 */
361 nd->root_args.fhsize = NFSX_V2FH;
362 l = ntohl(nd->swap_saddr.sin_addr.s_addr);
363 sprintf(buf,"%ld.%ld.%ld.%ld:%s",
364 (l >> 24) & 0xff, (l >> 16) & 0xff,
365 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam);
366 printf("NFS ROOT: %s\n",buf);
367 if (error = nfs_mountdiskless(buf, "/", MNT_RDONLY,
368 &nd->root_saddr, &nd->root_args, p, &vp, &mp)) {
369 if (swap_mp) {
370 mp->mnt_vfc->vfc_refcount--;
371 free(swap_mp, M_MOUNT);
372 }
373 return (error);
374 }
375
376 simple_lock(&mountlist_slock);
377 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
378 simple_unlock(&mountlist_slock);
379 rootvp = vp;
380 vfs_unbusy(mp, p);
381
382 /*
383 * This is not really an nfs issue, but it is much easier to
384 * set hostname here and then let the "/etc/rc.xxx" files
385 * mount the right /var based upon its preset value.
386 */
387 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN);
388 hostname[MAXHOSTNAMELEN - 1] = '\0';
389 for (i = 0; i < MAXHOSTNAMELEN; i++)
390 if (hostname[i] == '\0')
391 break;
392 hostnamelen = i;
393 inittodr(ntohl(nd->root_time));
394 return (0);
395 }
396
397 /*
398 * Internal version of mount system call for diskless setup.
399 */
400 static int
nfs_mountdiskless(path,which,mountflag,sin,args,p,vpp,mpp)401 nfs_mountdiskless(path, which, mountflag, sin, args, p, vpp, mpp)
402 char *path;
403 char *which;
404 int mountflag;
405 struct sockaddr_in *sin;
406 struct nfs_args *args;
407 struct proc *p;
408 struct vnode **vpp;
409 struct mount **mpp;
410 {
411 struct mount *mp;
412 struct mbuf *m;
413 int error;
414
415 if (error = vfs_rootmountalloc("nfs", path, &mp)) {
416 printf("nfs_mountroot: NFS not configured");
417 return (error);
418 }
419 mp->mnt_flag = mountflag;
420 MGET(m, MT_SONAME, M_WAITOK);
421 bcopy((caddr_t)sin, mtod(m, caddr_t), sin->sin_len);
422 m->m_len = sin->sin_len;
423 if (error = mountnfs(args, mp, m, which, path, vpp)) {
424 printf("nfs_mountroot: mount %s on %s: %d", path, which, error);
425 mp->mnt_vfc->vfc_refcount--;
426 vfs_unbusy(mp, p);
427 free(mp, M_MOUNT);
428 return (error);
429 }
430 (void) copystr(which, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0);
431 *mpp = mp;
432 return (0);
433 }
434
435 /*
436 * VFS Operations.
437 *
438 * mount system call
439 * It seems a bit dumb to copyinstr() the host and path here and then
440 * bcopy() them in mountnfs(), but I wanted to detect errors before
441 * doing the sockargs() call because sockargs() allocates an mbuf and
442 * an error after that means that I have to release the mbuf.
443 */
444 /* ARGSUSED */
445 int
nfs_mount(mp,path,data,ndp,p)446 nfs_mount(mp, path, data, ndp, p)
447 struct mount *mp;
448 char *path;
449 caddr_t data;
450 struct nameidata *ndp;
451 struct proc *p;
452 {
453 int error;
454 struct nfs_args args;
455 struct mbuf *nam;
456 struct vnode *vp;
457 char pth[MNAMELEN], hst[MNAMELEN];
458 u_int len;
459 u_char nfh[NFSX_V3FHMAX];
460
461 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args));
462 if (error)
463 return (error);
464 if (args.version != NFS_ARGSVERSION)
465 return (EPROGMISMATCH);
466 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
467 if (error)
468 return (error);
469 error = copyinstr(path, pth, MNAMELEN-1, &len);
470 if (error)
471 return (error);
472 bzero(&pth[len], MNAMELEN - len);
473 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
474 if (error)
475 return (error);
476 bzero(&hst[len], MNAMELEN - len);
477 /* sockargs() call must be after above copyin() calls */
478 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME);
479 if (error)
480 return (error);
481 args.fh = nfh;
482 error = mountnfs(&args, mp, nam, pth, hst, &vp);
483 return (error);
484 }
485
486 /*
487 * Common code for mount and mountroot
488 */
489 int
mountnfs(argp,mp,nam,pth,hst,vpp)490 mountnfs(argp, mp, nam, pth, hst, vpp)
491 register struct nfs_args *argp;
492 register struct mount *mp;
493 struct mbuf *nam;
494 char *pth, *hst;
495 struct vnode **vpp;
496 {
497 register struct nfsmount *nmp;
498 struct nfsnode *np;
499 int error, maxio;
500
501 if (mp->mnt_flag & MNT_UPDATE) {
502 nmp = VFSTONFS(mp);
503 /* update paths, file handles, etc, here XXX */
504 m_freem(nam);
505 return (0);
506 } else {
507 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount),
508 M_NFSMNT, M_WAITOK);
509 bzero((caddr_t)nmp, sizeof (struct nfsmount));
510 TAILQ_INIT(&nmp->nm_uidlruhead);
511 mp->mnt_data = (qaddr_t)nmp;
512 }
513 vfs_getnewfsid(mp);
514 nmp->nm_mountp = mp;
515 nmp->nm_flag = argp->flags;
516 if (nmp->nm_flag & NFSMNT_NQNFS)
517 /*
518 * We have to set mnt_maxsymlink to a non-zero value so
519 * that COMPAT_43 routines will know that we are setting
520 * the d_type field in directories (and can zero it for
521 * unsuspecting binaries).
522 */
523 mp->mnt_maxsymlinklen = 1;
524 nmp->nm_timeo = NFS_TIMEO;
525 nmp->nm_retry = NFS_RETRANS;
526 nmp->nm_wsize = NFS_WSIZE;
527 nmp->nm_rsize = NFS_RSIZE;
528 nmp->nm_readdirsize = NFS_READDIRSIZE;
529 nmp->nm_numgrps = NFS_MAXGRPS;
530 nmp->nm_readahead = NFS_DEFRAHEAD;
531 nmp->nm_leaseterm = NQ_DEFLEASE;
532 nmp->nm_deadthresh = NQ_DEADTHRESH;
533 CIRCLEQ_INIT(&nmp->nm_timerhead);
534 nmp->nm_inprog = NULLVP;
535 nmp->nm_fhsize = argp->fhsize;
536 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
537 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
538 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN);
539 nmp->nm_nam = nam;
540
541 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
542 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
543 if (nmp->nm_timeo < NFS_MINTIMEO)
544 nmp->nm_timeo = NFS_MINTIMEO;
545 else if (nmp->nm_timeo > NFS_MAXTIMEO)
546 nmp->nm_timeo = NFS_MAXTIMEO;
547 }
548
549 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
550 nmp->nm_retry = argp->retrans;
551 if (nmp->nm_retry > NFS_MAXREXMIT)
552 nmp->nm_retry = NFS_MAXREXMIT;
553 }
554
555 if (argp->flags & NFSMNT_NFSV3) {
556 if (argp->sotype == SOCK_DGRAM)
557 maxio = NFS_MAXDGRAMDATA;
558 else
559 maxio = NFS_MAXDATA;
560 } else
561 maxio = NFS_V2MAXDATA;
562
563 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
564 nmp->nm_wsize = argp->wsize;
565 /* Round down to multiple of blocksize */
566 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
567 if (nmp->nm_wsize <= 0)
568 nmp->nm_wsize = NFS_FABLKSIZE;
569 }
570 if (nmp->nm_wsize > maxio)
571 nmp->nm_wsize = maxio;
572 if (nmp->nm_wsize > MAXBSIZE)
573 nmp->nm_wsize = MAXBSIZE;
574
575 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
576 nmp->nm_rsize = argp->rsize;
577 /* Round down to multiple of blocksize */
578 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
579 if (nmp->nm_rsize <= 0)
580 nmp->nm_rsize = NFS_FABLKSIZE;
581 }
582 if (nmp->nm_rsize > maxio)
583 nmp->nm_rsize = maxio;
584 if (nmp->nm_rsize > MAXBSIZE)
585 nmp->nm_rsize = MAXBSIZE;
586
587 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
588 nmp->nm_readdirsize = argp->readdirsize;
589 /* Round down to multiple of blocksize */
590 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1);
591 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
592 nmp->nm_readdirsize = NFS_DIRBLKSIZ;
593 }
594 if (nmp->nm_readdirsize > maxio)
595 nmp->nm_readdirsize = maxio;
596
597 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
598 argp->maxgrouplist <= NFS_MAXGRPS)
599 nmp->nm_numgrps = argp->maxgrouplist;
600 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
601 argp->readahead <= NFS_MAXRAHEAD)
602 nmp->nm_readahead = argp->readahead;
603 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 &&
604 argp->leaseterm <= NQ_MAXLEASE)
605 nmp->nm_leaseterm = argp->leaseterm;
606 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
607 argp->deadthresh <= NQ_NEVERDEAD)
608 nmp->nm_deadthresh = argp->deadthresh;
609 /* Set up the sockets and per-host congestion */
610 nmp->nm_sotype = argp->sotype;
611 nmp->nm_soproto = argp->proto;
612
613 /*
614 * For Connection based sockets (TCP,...) defer the connect until
615 * the first request, in case the server is not responding.
616 */
617 if (nmp->nm_sotype == SOCK_DGRAM &&
618 (error = nfs_connect(nmp, (struct nfsreq *)0)))
619 goto bad;
620
621 /*
622 * This is silly, but it has to be set so that vinifod() works.
623 * We do not want to do an nfs_statfs() here since we can get
624 * stuck on a dead server and we are holding a lock on the mount
625 * point.
626 */
627 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA;
628 /*
629 * A reference count is needed on the nfsnode representing the
630 * remote root. If this object is not persistent, then backward
631 * traversals of the mount point (i.e. "..") will not work if
632 * the nfsnode gets flushed out of the cache. Ufs does not have
633 * this problem, because one can identify root inodes by their
634 * number == ROOTINO (2).
635 */
636 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
637 if (error)
638 goto bad;
639 *vpp = NFSTOV(np);
640
641 return (0);
642 bad:
643 nfs_disconnect(nmp);
644 free((caddr_t)nmp, M_NFSMNT);
645 m_freem(nam);
646 return (error);
647 }
648
649 /*
650 * unmount system call
651 */
652 int
nfs_unmount(mp,mntflags,p)653 nfs_unmount(mp, mntflags, p)
654 struct mount *mp;
655 int mntflags;
656 struct proc *p;
657 {
658 register struct nfsmount *nmp;
659 struct nfsnode *np;
660 struct vnode *vp;
661 int error, flags = 0;
662
663 if (mntflags & MNT_FORCE)
664 flags |= FORCECLOSE;
665 nmp = VFSTONFS(mp);
666 /*
667 * Goes something like this..
668 * - Check for activity on the root vnode (other than ourselves).
669 * - Call vflush() to clear out vnodes for this file system,
670 * except for the root vnode.
671 * - Decrement reference on the vnode representing remote root.
672 * - Close the socket
673 * - Free up the data structures
674 */
675 /*
676 * We need to decrement the ref. count on the nfsnode representing
677 * the remote root. See comment in mountnfs(). The VFS unmount()
678 * has done vput on this vnode, otherwise we would get deadlock!
679 */
680 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
681 if (error)
682 return(error);
683 vp = NFSTOV(np);
684 if (vp->v_usecount > 2) {
685 vput(vp);
686 return (EBUSY);
687 }
688
689 /*
690 * Must handshake with nqnfs_clientd() if it is active.
691 */
692 nmp->nm_flag |= NFSMNT_DISMINPROG;
693 while (nmp->nm_inprog != NULLVP)
694 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0);
695 error = vflush(mp, vp, flags);
696 if (error) {
697 vput(vp);
698 nmp->nm_flag &= ~NFSMNT_DISMINPROG;
699 return (error);
700 }
701
702 /*
703 * We are now committed to the unmount.
704 * For NQNFS, let the server daemon free the nfsmount structure.
705 */
706 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB))
707 nmp->nm_flag |= NFSMNT_DISMNT;
708
709 /*
710 * There are two reference counts to get rid of here.
711 */
712 vrele(vp);
713 vrele(vp);
714 vgone(vp);
715 nfs_disconnect(nmp);
716 m_freem(nmp->nm_nam);
717
718 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0)
719 free((caddr_t)nmp, M_NFSMNT);
720 return (0);
721 }
722
723 /*
724 * Return root of a filesystem
725 */
726 int
nfs_root(mp,vpp)727 nfs_root(mp, vpp)
728 struct mount *mp;
729 struct vnode **vpp;
730 {
731 register struct vnode *vp;
732 struct nfsmount *nmp;
733 struct nfsnode *np;
734 int error;
735
736 nmp = VFSTONFS(mp);
737 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
738 if (error)
739 return (error);
740 vp = NFSTOV(np);
741 vp->v_type = VDIR;
742 vp->v_flag = VROOT;
743 *vpp = vp;
744 return (0);
745 }
746
747 extern int syncprt;
748
749 /*
750 * Flush out the buffer cache
751 */
752 /* ARGSUSED */
753 int
nfs_sync(mp,waitfor,cred,p)754 nfs_sync(mp, waitfor, cred, p)
755 struct mount *mp;
756 int waitfor;
757 struct ucred *cred;
758 struct proc *p;
759 {
760 register struct vnode *vp;
761 int error, allerror = 0;
762
763 /*
764 * Force stale buffer cache information to be flushed.
765 */
766 loop:
767 for (vp = mp->mnt_vnodelist.lh_first;
768 vp != NULL;
769 vp = vp->v_mntvnodes.le_next) {
770 /*
771 * If the vnode that we are about to sync is no longer
772 * associated with this mount point, start over.
773 */
774 if (vp->v_mount != mp)
775 goto loop;
776 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL)
777 continue;
778 if (vget(vp, LK_EXCLUSIVE, p))
779 goto loop;
780 error = VOP_FSYNC(vp, cred, waitfor, p);
781 if (error)
782 allerror = error;
783 vput(vp);
784 }
785 return (allerror);
786 }
787
788 /*
789 * NFS flat namespace lookup.
790 * Currently unsupported.
791 */
792 /* ARGSUSED */
793 int
nfs_vget(mp,ino,vpp)794 nfs_vget(mp, ino, vpp)
795 struct mount *mp;
796 ino_t ino;
797 struct vnode **vpp;
798 {
799
800 return (EOPNOTSUPP);
801 }
802
803 /*
804 * At this point, this should never happen
805 */
806 /* ARGSUSED */
807 int
nfs_fhtovp(mp,fhp,nam,vpp,exflagsp,credanonp)808 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
809 register struct mount *mp;
810 struct fid *fhp;
811 struct mbuf *nam;
812 struct vnode **vpp;
813 int *exflagsp;
814 struct ucred **credanonp;
815 {
816
817 return (EINVAL);
818 }
819
820 /*
821 * Vnode pointer to File handle, should never happen either
822 */
823 /* ARGSUSED */
824 int
nfs_vptofh(vp,fhp)825 nfs_vptofh(vp, fhp)
826 struct vnode *vp;
827 struct fid *fhp;
828 {
829
830 return (EINVAL);
831 }
832
833 /*
834 * Vfs start routine, a no-op.
835 */
836 /* ARGSUSED */
837 int
nfs_start(mp,flags,p)838 nfs_start(mp, flags, p)
839 struct mount *mp;
840 int flags;
841 struct proc *p;
842 {
843
844 return (0);
845 }
846
847 /*
848 * Do operations associated with quotas, not supported
849 */
850 /* ARGSUSED */
851 int
nfs_quotactl(mp,cmd,uid,arg,p)852 nfs_quotactl(mp, cmd, uid, arg, p)
853 struct mount *mp;
854 int cmd;
855 uid_t uid;
856 caddr_t arg;
857 struct proc *p;
858 {
859
860 return (EOPNOTSUPP);
861 }
862
863 /*
864 * Do that sysctl thang...
865 */
866 static int
nfs_sysctl(int * name,u_int namelen,void * oldp,size_t * oldlenp,void * newp,size_t newlen,struct proc * p)867 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
868 size_t newlen, struct proc *p)
869 {
870 int rv;
871
872 /*
873 * All names at this level are terminal.
874 */
875 if(namelen > 1)
876 return ENOTDIR; /* overloaded */
877
878 switch(name[0]) {
879 case NFS_NFSSTATS:
880 if(!oldp) {
881 *oldlenp = sizeof nfsstats;
882 return 0;
883 }
884
885 if(*oldlenp < sizeof nfsstats) {
886 *oldlenp = sizeof nfsstats;
887 return ENOMEM;
888 }
889
890 rv = copyout(&nfsstats, oldp, sizeof nfsstats);
891 if(rv) return rv;
892
893 if(newp && newlen != sizeof nfsstats)
894 return EINVAL;
895
896 if(newp) {
897 return copyin(newp, &nfsstats, sizeof nfsstats);
898 }
899 return 0;
900
901 default:
902 return EOPNOTSUPP;
903 }
904 }
905
906