1 /* $OpenBSD: nfs_vfsops.c,v 1.57 2005/05/22 17:37:49 pedro Exp $ */
2 /* $NetBSD: nfs_vfsops.c,v 1.46.4.1 1996/05/25 22:40:35 fvdl Exp $ */
3
4 /*
5 * Copyright (c) 1989, 1993, 1995
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Rick Macklem at The University of Guelph.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95
36 */
37
38 #include <sys/param.h>
39 #include <sys/conf.h>
40 #include <sys/ioctl.h>
41 #include <sys/signal.h>
42 #include <sys/proc.h>
43 #include <sys/namei.h>
44 #include <sys/vnode.h>
45 #include <sys/kernel.h>
46 #include <sys/mount.h>
47 #include <sys/buf.h>
48 #include <sys/mbuf.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/systm.h>
52 #include <sys/sysctl.h>
53
54 #include <net/if.h>
55 #include <net/route.h>
56 #include <netinet/in.h>
57
58 #include <nfs/rpcv2.h>
59 #include <nfs/nfsproto.h>
60 #include <nfs/nfsnode.h>
61 #include <nfs/nfs.h>
62 #include <nfs/nfsmount.h>
63 #include <nfs/xdr_subs.h>
64 #include <nfs/nfsm_subs.h>
65 #include <nfs/nfsdiskless.h>
66 #include <nfs/nfs_var.h>
67
68 #define NQ_DEADTHRESH NQ_NEVERDEAD /* Default nm_deadthresh */
69 #define NQ_NEVERDEAD 9 /* Greater than max. nm_timeouts */
70
71 extern struct nfsstats nfsstats;
72 extern int nfs_ticks;
73
74 int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, struct proc *);
75 int nfs_checkexp(struct mount *mp, struct mbuf *nam,
76 int *extflagsp, struct ucred **credanonp);
77
78 /*
79 * nfs vfs operations.
80 */
81 const struct vfsops nfs_vfsops = {
82 nfs_mount,
83 nfs_start,
84 nfs_unmount,
85 nfs_root,
86 nfs_quotactl,
87 nfs_statfs,
88 nfs_sync,
89 nfs_vget,
90 nfs_fhtovp,
91 nfs_vptofh,
92 nfs_vfs_init,
93 nfs_sysctl,
94 nfs_checkexp
95 };
96
97 extern u_int32_t nfs_procids[NFS_NPROCS];
98 extern u_int32_t nfs_prog, nfs_vers;
99
100 struct mount *nfs_mount_diskless(struct nfs_dlmount *, char *, int);
101
102 #define TRUE 1
103 #define FALSE 0
104
105 /*
106 * nfs statfs call
107 */
108 int
nfs_statfs(mp,sbp,p)109 nfs_statfs(mp, sbp, p)
110 struct mount *mp;
111 struct statfs *sbp;
112 struct proc *p;
113 {
114 struct vnode *vp;
115 struct nfs_statfs *sfp = NULL;
116 caddr_t cp;
117 u_int32_t *tl;
118 int32_t t1, t2;
119 caddr_t bpos, dpos, cp2;
120 struct nfsmount *nmp = VFSTONFS(mp);
121 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
122 struct mbuf *mreq, *mrep = NULL, *md, *mb, *mb2;
123 struct ucred *cred;
124 struct nfsnode *np;
125 u_quad_t tquad;
126
127 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
128 if (error)
129 return (error);
130 vp = NFSTOV(np);
131 cred = crget();
132 cred->cr_ngroups = 0;
133 if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0)
134 (void)nfs_fsinfo(nmp, vp, cred, p);
135 nfsstats.rpccnt[NFSPROC_FSSTAT]++;
136 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
137 nfsm_fhtom(vp, v3);
138 nfsm_request(vp, NFSPROC_FSSTAT, p, cred);
139 if (v3)
140 nfsm_postop_attr(vp, retattr);
141 if (error) {
142 if (mrep != NULL)
143 m_free(mrep);
144 goto nfsmout;
145 }
146 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
147 sbp->f_flags = nmp->nm_flag;
148 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize);
149 if (v3) {
150 sbp->f_bsize = NFS_FABLKSIZE;
151 tquad = fxdr_hyper(&sfp->sf_tbytes);
152 sbp->f_blocks = (u_int32_t)(tquad / (u_quad_t)NFS_FABLKSIZE);
153 tquad = fxdr_hyper(&sfp->sf_fbytes);
154 sbp->f_bfree = (u_int32_t)(tquad / (u_quad_t)NFS_FABLKSIZE);
155 tquad = fxdr_hyper(&sfp->sf_abytes);
156 sbp->f_bavail = (int32_t)((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
157 sbp->f_files = (fxdr_unsigned(int32_t,
158 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
159 sbp->f_ffree = (fxdr_unsigned(int32_t,
160 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
161 } else {
162 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
163 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
164 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
165 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
166 sbp->f_files = 0;
167 sbp->f_ffree = 0;
168 }
169 if (sbp != &mp->mnt_stat) {
170 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
171 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
172 bcopy(&mp->mnt_stat.mount_info.nfs_args,
173 &sbp->mount_info.nfs_args, sizeof(struct nfs_args));
174 }
175 strncpy(&sbp->f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN);
176 nfsm_reqdone;
177 vrele(vp);
178 crfree(cred);
179 return (error);
180 }
181
182 /*
183 * nfs version 3 fsinfo rpc call
184 */
185 int
nfs_fsinfo(nmp,vp,cred,p)186 nfs_fsinfo(nmp, vp, cred, p)
187 struct nfsmount *nmp;
188 struct vnode *vp;
189 struct ucred *cred;
190 struct proc *p;
191 {
192 struct nfsv3_fsinfo *fsp;
193 caddr_t cp;
194 int32_t t1, t2;
195 u_int32_t *tl, pref, max;
196 caddr_t bpos, dpos, cp2;
197 int error = 0, retattr;
198 struct mbuf *mreq, *mrep, *md, *mb, *mb2;
199
200 nfsstats.rpccnt[NFSPROC_FSINFO]++;
201 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
202 nfsm_fhtom(vp, 1);
203 nfsm_request(vp, NFSPROC_FSINFO, p, cred);
204 nfsm_postop_attr(vp, retattr);
205 if (!error) {
206 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
207 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
208 if (pref < nmp->nm_wsize)
209 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
210 ~(NFS_FABLKSIZE - 1);
211 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
212 if (max < nmp->nm_wsize) {
213 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
214 if (nmp->nm_wsize == 0)
215 nmp->nm_wsize = max;
216 }
217 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
218 if (pref < nmp->nm_rsize)
219 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
220 ~(NFS_FABLKSIZE - 1);
221 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
222 if (max < nmp->nm_rsize) {
223 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
224 if (nmp->nm_rsize == 0)
225 nmp->nm_rsize = max;
226 }
227 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
228 if (pref < nmp->nm_readdirsize)
229 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
230 ~(NFS_DIRBLKSIZ - 1);
231 if (max < nmp->nm_readdirsize) {
232 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
233 if (nmp->nm_readdirsize == 0)
234 nmp->nm_readdirsize = max;
235 }
236 nmp->nm_flag |= NFSMNT_GOTFSINFO;
237 }
238 nfsm_reqdone;
239 return (error);
240 }
241
242 /*
243 * Mount a remote root fs via. NFS. It goes like this:
244 * - Call nfs_boot_init() to fill in the nfs_diskless struct
245 * (using RARP, bootparam RPC, mountd RPC)
246 * - hand craft the swap nfs vnode hanging off a fake mount point
247 * if swdevt[0].sw_dev == NODEV
248 * - build the rootfs mount point and call mountnfs() to do the rest.
249 */
250 int
nfs_mountroot()251 nfs_mountroot()
252 {
253 struct nfs_diskless nd;
254 struct vattr attr;
255 struct mount *mp;
256 struct vnode *vp;
257 struct proc *procp;
258 long n;
259 int error;
260
261 procp = curproc; /* XXX */
262
263 /*
264 * Call nfs_boot_init() to fill in the nfs_diskless struct.
265 * Side effect: Finds and configures a network interface.
266 */
267 bzero((caddr_t) &nd, sizeof(nd));
268 nfs_boot_init(&nd, procp);
269
270 /*
271 * Create the root mount point.
272 */
273 if (nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root, -1))
274 panic("nfs_mountroot: root");
275 mp = nfs_mount_diskless(&nd.nd_root, "/", 0);
276 nfs_root(mp, &rootvp);
277 printf("root on %s\n", nd.nd_root.ndm_host);
278
279 /*
280 * Link it into the mount list.
281 */
282 simple_lock(&mountlist_slock);
283 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
284 simple_unlock(&mountlist_slock);
285 vfs_unbusy(mp, procp);
286
287 /* Get root attributes (for the time). */
288 error = VOP_GETATTR(rootvp, &attr, procp->p_ucred, procp);
289 if (error) panic("nfs_mountroot: getattr for root");
290 n = attr.va_atime.tv_sec;
291 #ifdef DEBUG
292 printf("root time: 0x%lx\n", n);
293 #endif
294 inittodr(n);
295
296 #ifdef notyet
297 /* Set up swap credentials. */
298 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid);
299 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid);
300 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) >
301 NGROUPS)
302 proc0.p_ucred->cr_ngroups = NGROUPS;
303 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++)
304 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]);
305 #endif
306
307 /*
308 * "Mount" the swap device.
309 *
310 * On a "dataless" configuration (swap on disk) we will have:
311 * (swdevt[0].sw_dev != NODEV) identifying the swap device.
312 */
313 if (bdevvp(swapdev, &swapdev_vp))
314 panic("nfs_mountroot: can't setup swap vp");
315 if (swdevt[0].sw_dev != NODEV) {
316 printf("swap on device 0x%x\n", swdevt[0].sw_dev);
317 return (0);
318 }
319
320 /*
321 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV)
322 * Create a fake mount point just for the swap vnode so that the
323 * swap file can be on a different server from the rootfs.
324 *
325 * Wait 5 retries, finally no swap is cool. -mickey
326 */
327 error = nfs_boot_getfh(&nd.nd_boot, "swap", &nd.nd_swap, 5);
328 if (!error) {
329 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0);
330 nfs_root(mp, &vp);
331 vfs_unbusy(mp, procp);
332
333 /*
334 * Since the swap file is not the root dir of a file system,
335 * hack it to a regular file.
336 */
337 vp->v_type = VREG;
338 vp->v_flag = 0;
339
340 /*
341 * Next line is a hack to make swapmount() work on NFS swap files.
342 * XXX-smurph
343 */
344 swdevt[0].sw_dev = NETDEV;
345 /* end hack */
346 swdevt[0].sw_vp = vp;
347
348 /*
349 * Find out how large the swap file is.
350 */
351 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp);
352 if (error)
353 printf("nfs_mountroot: getattr for swap\n");
354 n = (long) (attr.va_size >> DEV_BSHIFT);
355
356 printf("swap on %s\n", nd.nd_swap.ndm_host);
357 #ifdef DEBUG
358 printf("swap size: 0x%lx (blocks)\n", n);
359 #endif
360 swdevt[0].sw_nblks = n;
361 return (0);
362 }
363
364 printf("WARNING: no swap\n");
365 swdevt[0].sw_dev = NODEV;
366 swdevt[0].sw_vp = NULL;
367 swdevt[0].sw_nblks = 0;
368
369 return (0);
370 }
371
372 /*
373 * Internal version of mount system call for diskless setup.
374 */
375 struct mount *
nfs_mount_diskless(ndmntp,mntname,mntflag)376 nfs_mount_diskless(ndmntp, mntname, mntflag)
377 struct nfs_dlmount *ndmntp;
378 char *mntname;
379 int mntflag;
380 {
381 struct nfs_args args;
382 struct mount *mp;
383 struct mbuf *m;
384 int error;
385
386 if (vfs_rootmountalloc("nfs", mntname, &mp))
387 panic("nfs_mount_diskless: vfs_rootmountalloc failed");
388 mp->mnt_flag |= mntflag;
389
390 /* Initialize mount args. */
391 bzero((caddr_t) &args, sizeof(args));
392 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr;
393 args.addrlen = args.addr->sa_len;
394 args.sotype = SOCK_DGRAM;
395 args.fh = ndmntp->ndm_fh;
396 args.fhsize = NFSX_V2FH;
397 args.hostname = ndmntp->ndm_host;
398
399 #ifdef NFS_BOOT_OPTIONS
400 args.flags |= NFS_BOOT_OPTIONS;
401 #endif
402 #ifdef NFS_BOOT_RWSIZE
403 /*
404 * Reduce rsize,wsize for interfaces that consistently
405 * drop fragments of long UDP messages. (i.e. wd8003).
406 * You can always change these later via remount.
407 */
408 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE;
409 args.wsize = NFS_BOOT_RWSIZE;
410 args.rsize = NFS_BOOT_RWSIZE;
411 #endif
412
413 /* Get mbuf for server sockaddr. */
414 m = m_get(M_WAIT, MT_SONAME);
415 bcopy((caddr_t)args.addr, mtod(m, caddr_t),
416 (m->m_len = args.addr->sa_len));
417
418 error = mountnfs(&args, mp, m, mntname, args.hostname);
419 if (error)
420 panic("nfs_mountroot: mount %s failed: %d", mntname, error);
421
422 return (mp);
423 }
424
425 void
nfs_decode_args(nmp,argp,nargp)426 nfs_decode_args(nmp, argp, nargp)
427 struct nfsmount *nmp;
428 struct nfs_args *argp;
429 struct nfs_args *nargp;
430 {
431 int s;
432 int adjsock = 0;
433 int maxio;
434
435 s = splsoftnet();
436
437 #if 0
438 /* Re-bind if rsrvd port requested and wasn't on one */
439 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
440 && (argp->flags & NFSMNT_RESVPORT);
441 #endif
442 /* Also re-bind if we're switching to/from a connected UDP socket */
443 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
444 (argp->flags & NFSMNT_NOCONN));
445
446 /* Update flags atomically. Don't change the lock bits. */
447 nmp->nm_flag =
448 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL);
449 splx(s);
450
451 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
452 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
453 if (nmp->nm_timeo < NFS_MINTIMEO)
454 nmp->nm_timeo = NFS_MINTIMEO;
455 else if (nmp->nm_timeo > NFS_MAXTIMEO)
456 nmp->nm_timeo = NFS_MAXTIMEO;
457 }
458
459 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
460 nmp->nm_retry = argp->retrans;
461 if (nmp->nm_retry > NFS_MAXREXMIT)
462 nmp->nm_retry = NFS_MAXREXMIT;
463 }
464
465 if (argp->flags & NFSMNT_NFSV3) {
466 if (argp->sotype == SOCK_DGRAM)
467 maxio = NFS_MAXDGRAMDATA;
468 else
469 maxio = NFS_MAXDATA;
470 } else
471 maxio = NFS_V2MAXDATA;
472
473 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
474 int osize = nmp->nm_wsize;
475 nmp->nm_wsize = argp->wsize;
476 /* Round down to multiple of blocksize */
477 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
478 if (nmp->nm_wsize <= 0)
479 nmp->nm_wsize = NFS_FABLKSIZE;
480 adjsock |= (nmp->nm_wsize != osize);
481 }
482 if (nmp->nm_wsize > maxio)
483 nmp->nm_wsize = maxio;
484 if (nmp->nm_wsize > MAXBSIZE)
485 nmp->nm_wsize = MAXBSIZE;
486
487 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
488 int osize = nmp->nm_rsize;
489 nmp->nm_rsize = argp->rsize;
490 /* Round down to multiple of blocksize */
491 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
492 if (nmp->nm_rsize <= 0)
493 nmp->nm_rsize = NFS_FABLKSIZE;
494 adjsock |= (nmp->nm_rsize != osize);
495 }
496 if (nmp->nm_rsize > maxio)
497 nmp->nm_rsize = maxio;
498 if (nmp->nm_rsize > MAXBSIZE)
499 nmp->nm_rsize = MAXBSIZE;
500
501 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
502 nmp->nm_readdirsize = argp->readdirsize;
503 /* Round down to multiple of blocksize */
504 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1);
505 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
506 nmp->nm_readdirsize = NFS_DIRBLKSIZ;
507 } else if (argp->flags & NFSMNT_RSIZE)
508 nmp->nm_readdirsize = nmp->nm_rsize;
509
510 if (nmp->nm_readdirsize > maxio)
511 nmp->nm_readdirsize = maxio;
512
513 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
514 argp->maxgrouplist <= NFS_MAXGRPS)
515 nmp->nm_numgrps = argp->maxgrouplist;
516 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
517 argp->readahead <= NFS_MAXRAHEAD)
518 nmp->nm_readahead = argp->readahead;
519 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
520 argp->deadthresh <= NQ_NEVERDEAD)
521 nmp->nm_deadthresh = argp->deadthresh;
522 if (argp->flags & NFSMNT_ACREGMIN && argp->acregmin >= 0) {
523 if (argp->acregmin > 0xffff)
524 nmp->nm_acregmin = 0xffff;
525 else
526 nmp->nm_acregmin = argp->acregmin;
527 }
528 if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0) {
529 if (argp->acregmax > 0xffff)
530 nmp->nm_acregmax = 0xffff;
531 else
532 nmp->nm_acregmax = argp->acregmax;
533 }
534 if (nmp->nm_acregmin > nmp->nm_acregmax)
535 nmp->nm_acregmin = nmp->nm_acregmax;
536
537 if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0) {
538 if (argp->acdirmin > 0xffff)
539 nmp->nm_acdirmin = 0xffff;
540 else
541 nmp->nm_acdirmin = argp->acdirmin;
542 }
543 if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0) {
544 if (argp->acdirmax > 0xffff)
545 nmp->nm_acdirmax = 0xffff;
546 else
547 nmp->nm_acdirmax = argp->acdirmax;
548 }
549 if (nmp->nm_acdirmin > nmp->nm_acdirmax)
550 nmp->nm_acdirmin = nmp->nm_acdirmax;
551
552 if (nmp->nm_so && adjsock) {
553 nfs_disconnect(nmp);
554 if (nmp->nm_sotype == SOCK_DGRAM)
555 while (nfs_connect(nmp, (struct nfsreq *)0)) {
556 printf("nfs_args: retrying connect\n");
557 (void) tsleep((caddr_t)&lbolt,
558 PSOCK, "nfscon", 0);
559 }
560 }
561
562 /* Update nargp based on nmp */
563 nargp->wsize = nmp->nm_wsize;
564 nargp->rsize = nmp->nm_rsize;
565 nargp->readdirsize = nmp->nm_readdirsize;
566 nargp->timeo = nmp->nm_timeo;
567 nargp->retrans = nmp->nm_retry;
568 nargp->maxgrouplist = nmp->nm_numgrps;
569 nargp->readahead = nmp->nm_readahead;
570 nargp->deadthresh = nmp->nm_deadthresh;
571 nargp->acregmin = nmp->nm_acregmin;
572 nargp->acregmax = nmp->nm_acregmax;
573 nargp->acdirmin = nmp->nm_acdirmin;
574 nargp->acdirmax = nmp->nm_acdirmax;
575 }
576
577 /*
578 * VFS Operations.
579 *
580 * mount system call
581 * It seems a bit dumb to copyinstr() the host and path here and then
582 * bcopy() them in mountnfs(), but I wanted to detect errors before
583 * doing the sockargs() call because sockargs() allocates an mbuf and
584 * an error after that means that I have to release the mbuf.
585 */
586 /* ARGSUSED */
587 int
nfs_mount(mp,path,data,ndp,p)588 nfs_mount(mp, path, data, ndp, p)
589 struct mount *mp;
590 const char *path;
591 void *data;
592 struct nameidata *ndp;
593 struct proc *p;
594 {
595 int error;
596 struct nfs_args args;
597 struct mbuf *nam;
598 char pth[MNAMELEN], hst[MNAMELEN];
599 size_t len;
600 u_char nfh[NFSX_V3FHMAX];
601
602 error = copyin (data, &args, sizeof (args.version));
603 if (error)
604 return (error);
605 if (args.version == 3) {
606 error = copyin (data, (caddr_t)&args,
607 sizeof (struct nfs_args3));
608 args.flags &= ~(NFSMNT_INTERNAL|NFSMNT_NOAC);
609 }
610 else if (args.version == NFS_ARGSVERSION) {
611 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args));
612 args.flags &= ~NFSMNT_NOAC; /* XXX - compatibility */
613 }
614 else
615 return (EPROGMISMATCH);
616 if (error)
617 return (error);
618
619 if (nfs_niothreads < 0) {
620 nfs_niothreads = 4;
621 nfs_getset_niothreads(TRUE);
622 }
623
624 if (mp->mnt_flag & MNT_UPDATE) {
625 struct nfsmount *nmp = VFSTONFS(mp);
626
627 if (nmp == NULL)
628 return (EIO);
629 /*
630 * When doing an update, we can't change from or to
631 * v3.
632 */
633 args.flags = (args.flags & ~(NFSMNT_NFSV3)) |
634 (nmp->nm_flag & (NFSMNT_NFSV3));
635 nfs_decode_args(nmp, &args, &mp->mnt_stat.mount_info.nfs_args);
636 return (0);
637 }
638 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX)
639 return (EINVAL);
640 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
641 if (error)
642 return (error);
643 error = copyinstr(path, pth, MNAMELEN-1, &len);
644 if (error)
645 return (error);
646 bzero(&pth[len], MNAMELEN - len);
647 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
648 if (error)
649 return (error);
650 bzero(&hst[len], MNAMELEN - len);
651 /* sockargs() call must be after above copyin() calls */
652 error = sockargs(&nam, args.addr, args.addrlen, MT_SONAME);
653 if (error)
654 return (error);
655 args.fh = nfh;
656 error = mountnfs(&args, mp, nam, pth, hst);
657 return (error);
658 }
659
660 /*
661 * Common code for mount and mountroot
662 */
663 int
mountnfs(argp,mp,nam,pth,hst)664 mountnfs(argp, mp, nam, pth, hst)
665 struct nfs_args *argp;
666 struct mount *mp;
667 struct mbuf *nam;
668 char *pth, *hst;
669 {
670 struct nfsmount *nmp;
671 int error;
672
673 if (mp->mnt_flag & MNT_UPDATE) {
674 nmp = VFSTONFS(mp);
675 /* update paths, file handles, etc, here XXX */
676 m_freem(nam);
677 return (0);
678 } else {
679 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount),
680 M_NFSMNT, M_WAITOK);
681 bzero((caddr_t)nmp, sizeof (struct nfsmount));
682 mp->mnt_data = (qaddr_t)nmp;
683 TAILQ_INIT(&nmp->nm_uidlruhead);
684 }
685
686 vfs_getnewfsid(mp);
687 nmp->nm_mountp = mp;
688 nmp->nm_timeo = NFS_TIMEO;
689 nmp->nm_retry = NFS_RETRANS;
690 nmp->nm_wsize = NFS_WSIZE;
691 nmp->nm_rsize = NFS_RSIZE;
692 nmp->nm_readdirsize = NFS_READDIRSIZE;
693 nmp->nm_numgrps = NFS_MAXGRPS;
694 nmp->nm_readahead = NFS_DEFRAHEAD;
695 nmp->nm_deadthresh = NQ_DEADTHRESH;
696 CIRCLEQ_INIT(&nmp->nm_timerhead);
697 nmp->nm_inprog = NULLVP;
698 nmp->nm_fhsize = argp->fhsize;
699 nmp->nm_acregmin = NFS_MINATTRTIMO;
700 nmp->nm_acregmax = NFS_MAXATTRTIMO;
701 nmp->nm_acdirmin = NFS_MINATTRTIMO;
702 nmp->nm_acdirmax = NFS_MAXATTRTIMO;
703 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
704 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN);
705 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
706 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN);
707 bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp));
708 nmp->nm_nam = nam;
709 nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args);
710
711 /* Set up the sockets and per-host congestion */
712 nmp->nm_sotype = argp->sotype;
713 nmp->nm_soproto = argp->proto;
714
715 /*
716 * For Connection based sockets (TCP,...) defer the connect until
717 * the first request, in case the server is not responding.
718 */
719 if (nmp->nm_sotype == SOCK_DGRAM &&
720 (error = nfs_connect(nmp, (struct nfsreq *)0)))
721 goto bad;
722
723 /*
724 * This is silly, but it has to be set so that vinifod() works.
725 * We do not want to do an nfs_statfs() here since we can get
726 * stuck on a dead server and we are holding a lock on the mount
727 * point.
728 */
729 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA;
730
731 return (0);
732 bad:
733 nfs_disconnect(nmp);
734 free((caddr_t)nmp, M_NFSMNT);
735 m_freem(nam);
736 return (error);
737 }
738
739 /*
740 * unmount system call
741 */
742 int
nfs_unmount(mp,mntflags,p)743 nfs_unmount(mp, mntflags, p)
744 struct mount *mp;
745 int mntflags;
746 struct proc *p;
747 {
748 struct nfsmount *nmp;
749 int error, flags = 0;
750
751 if (mntflags & MNT_FORCE)
752 flags |= FORCECLOSE;
753 nmp = VFSTONFS(mp);
754 /*
755 * Goes something like this..
756 * - Call vflush() to clear out vnodes for this file system,
757 * except for the root vnode.
758 * - Close the socket
759 * - Free up the data structures
760 */
761
762 /*
763 * Must handshake with nqnfs_clientd() if it is active.
764 */
765 nmp->nm_flag |= NFSMNT_DISMINPROG;
766 while (nmp->nm_inprog != NULLVP)
767 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0);
768 error = vflush(mp, NULL, flags);
769 if (error) {
770 nmp->nm_flag &= ~NFSMNT_DISMINPROG;
771 return (error);
772 }
773
774 /*
775 * We are now committed to the unmount.
776 * For NQNFS, let the server daemon free the nfsmount structure.
777 */
778 if (nmp->nm_flag & NFSMNT_KERB)
779 nmp->nm_flag |= NFSMNT_DISMNT;
780
781 nfs_disconnect(nmp);
782 m_freem(nmp->nm_nam);
783
784 if ((nmp->nm_flag & NFSMNT_KERB) == 0)
785 free((caddr_t)nmp, M_NFSMNT);
786 return (0);
787 }
788
789 /*
790 * Return root of a filesystem
791 */
792 int
nfs_root(mp,vpp)793 nfs_root(mp, vpp)
794 struct mount *mp;
795 struct vnode **vpp;
796 {
797 struct nfsmount *nmp;
798 struct nfsnode *np;
799 int error;
800
801 nmp = VFSTONFS(mp);
802 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
803 if (error)
804 return (error);
805 *vpp = NFSTOV(np);
806 return (0);
807 }
808
809 extern int syncprt;
810
811 /*
812 * Flush out the buffer cache
813 */
814 /* ARGSUSED */
815 int
nfs_sync(mp,waitfor,cred,p)816 nfs_sync(mp, waitfor, cred, p)
817 struct mount *mp;
818 int waitfor;
819 struct ucred *cred;
820 struct proc *p;
821 {
822 struct vnode *vp;
823 int error, allerror = 0;
824
825 /*
826 * Don't traverse the vnode list if we want to skip all of them.
827 */
828 if (waitfor == MNT_LAZY)
829 return (allerror);
830
831 /*
832 * Force stale buffer cache information to be flushed.
833 */
834 loop:
835 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL;
836 vp = LIST_NEXT(vp, v_mntvnodes)) {
837 /*
838 * If the vnode that we are about to sync is no longer
839 * associated with this mount point, start over.
840 */
841 if (vp->v_mount != mp)
842 goto loop;
843 if (VOP_ISLOCKED(vp) || LIST_FIRST(&vp->v_dirtyblkhd) == NULL)
844 continue;
845 if (vget(vp, LK_EXCLUSIVE, p))
846 goto loop;
847 error = VOP_FSYNC(vp, cred, waitfor, p);
848 if (error)
849 allerror = error;
850 vput(vp);
851 }
852
853 return (allerror);
854 }
855
856 /*
857 * NFS flat namespace lookup.
858 * Currently unsupported.
859 */
860 /* ARGSUSED */
861 int
nfs_vget(mp,ino,vpp)862 nfs_vget(mp, ino, vpp)
863 struct mount *mp;
864 ino_t ino;
865 struct vnode **vpp;
866 {
867
868 return (EOPNOTSUPP);
869 }
870
871 /*
872 * Do that sysctl thang...
873 */
874 int
nfs_sysctl(int * name,u_int namelen,void * oldp,size_t * oldlenp,void * newp,size_t newlen,struct proc * p)875 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
876 size_t newlen, struct proc *p)
877 {
878 int rv;
879
880 /*
881 * All names at this level are terminal.
882 */
883 if(namelen > 1)
884 return ENOTDIR; /* overloaded */
885
886 switch(name[0]) {
887 case NFS_NFSSTATS:
888 if(!oldp) {
889 *oldlenp = sizeof nfsstats;
890 return 0;
891 }
892
893 if(*oldlenp < sizeof nfsstats) {
894 *oldlenp = sizeof nfsstats;
895 return ENOMEM;
896 }
897
898 rv = copyout(&nfsstats, oldp, sizeof nfsstats);
899 if(rv) return rv;
900
901 if(newp && newlen != sizeof nfsstats)
902 return EINVAL;
903
904 if(newp) {
905 return copyin(newp, &nfsstats, sizeof nfsstats);
906 }
907 return 0;
908
909 case NFS_NIOTHREADS:
910 nfs_getset_niothreads(0);
911
912 rv = sysctl_int(oldp, oldlenp, newp, newlen, &nfs_niothreads);
913 if (newp)
914 nfs_getset_niothreads(1);
915
916 return rv;
917
918 default:
919 return EOPNOTSUPP;
920 }
921 }
922
923
924 /*
925 * At this point, this should never happen
926 */
927 /* ARGSUSED */
928 int
nfs_fhtovp(mp,fhp,vpp)929 nfs_fhtovp(mp, fhp, vpp)
930 struct mount *mp;
931 struct fid *fhp;
932 struct vnode **vpp;
933 {
934
935 return (EINVAL);
936 }
937
938 /*
939 * Vnode pointer to File handle, should never happen either
940 */
941 /* ARGSUSED */
942 int
nfs_vptofh(vp,fhp)943 nfs_vptofh(vp, fhp)
944 struct vnode *vp;
945 struct fid *fhp;
946 {
947
948 return (EINVAL);
949 }
950
951 /*
952 * Vfs start routine, a no-op.
953 */
954 /* ARGSUSED */
955 int
nfs_start(mp,flags,p)956 nfs_start(mp, flags, p)
957 struct mount *mp;
958 int flags;
959 struct proc *p;
960 {
961
962 return (0);
963 }
964
965 /*
966 * Do operations associated with quotas, not supported
967 */
968 /* ARGSUSED */
969 int
nfs_quotactl(mp,cmd,uid,arg,p)970 nfs_quotactl(mp, cmd, uid, arg, p)
971 struct mount *mp;
972 int cmd;
973 uid_t uid;
974 caddr_t arg;
975 struct proc *p;
976 {
977
978 return (EOPNOTSUPP);
979 }
980
981 /*
982 * check export permission, not supported
983 */
984 /* ARGUSED */
985 int
nfs_checkexp(mp,nam,exflagsp,credanonp)986 nfs_checkexp(mp, nam, exflagsp, credanonp)
987 struct mount *mp;
988 struct mbuf *nam;
989 int *exflagsp;
990 struct ucred **credanonp;
991 {
992 return (EOPNOTSUPP);
993 }
994
995