FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_vfsops.c
1 /* $NetBSD: nfs_vfsops.c,v 1.145.2.1 2005/09/27 10:31:29 tron Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993, 1995
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95
35 */
36
37 #include <sys/cdefs.h>
38 __KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.145.2.1 2005/09/27 10:31:29 tron Exp $");
39
40 #if defined(_KERNEL_OPT)
41 #include "opt_compat_netbsd.h"
42 #include "opt_nfs.h"
43 #endif
44
45 #include <sys/param.h>
46 #include <sys/ioctl.h>
47 #include <sys/signal.h>
48 #include <sys/proc.h>
49 #include <sys/namei.h>
50 #include <sys/device.h>
51 #include <sys/vnode.h>
52 #include <sys/kernel.h>
53 #include <sys/mount.h>
54 #include <sys/buf.h>
55 #include <sys/mbuf.h>
56 #include <sys/dirent.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/sysctl.h>
60 #include <sys/systm.h>
61
62 #include <net/if.h>
63 #include <net/route.h>
64 #include <netinet/in.h>
65
66 #include <nfs/rpcv2.h>
67 #include <nfs/nfsproto.h>
68 #include <nfs/nfsnode.h>
69 #include <nfs/nfs.h>
70 #include <nfs/nfsmount.h>
71 #include <nfs/xdr_subs.h>
72 #include <nfs/nfsm_subs.h>
73 #include <nfs/nfsdiskless.h>
74 #include <nfs/nqnfs.h>
75 #include <nfs/nfs_var.h>
76
77 extern struct nfsstats nfsstats;
78 extern int nfs_ticks;
79
80 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure");
81
82 /*
83 * nfs vfs operations.
84 */
85
86 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc;
87 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc;
88 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc;
89
90 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = {
91 &nfsv2_vnodeop_opv_desc,
92 &spec_nfsv2nodeop_opv_desc,
93 &fifo_nfsv2nodeop_opv_desc,
94 NULL,
95 };
96
97 struct vfsops nfs_vfsops = {
98 MOUNT_NFS,
99 nfs_mount,
100 nfs_start,
101 nfs_unmount,
102 nfs_root,
103 nfs_quotactl,
104 nfs_statvfs,
105 nfs_sync,
106 nfs_vget,
107 nfs_fhtovp,
108 nfs_vptofh,
109 nfs_vfs_init,
110 nfs_vfs_reinit,
111 nfs_vfs_done,
112 NULL,
113 nfs_mountroot,
114 nfs_checkexp,
115 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
116 vfs_stdextattrctl,
117 nfs_vnodeopv_descs,
118 };
119
120 extern u_int32_t nfs_procids[NFS_NPROCS];
121 extern u_int32_t nfs_prog, nfs_vers;
122
123 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *,
124 struct mount **, struct vnode **, struct proc *));
125
126 /*
127 * nfs statvfs call
128 */
129 int
130 nfs_statvfs(mp, sbp, p)
131 struct mount *mp;
132 struct statvfs *sbp;
133 struct proc *p;
134 {
135 struct vnode *vp;
136 struct nfs_statfs *sfp;
137 caddr_t cp;
138 u_int32_t *tl;
139 int32_t t1, t2;
140 caddr_t bpos, dpos, cp2;
141 struct nfsmount *nmp = VFSTONFS(mp);
142 int error = 0, retattr;
143 #ifdef NFS_V2_ONLY
144 const int v3 = 0;
145 #else
146 int v3 = (nmp->nm_flag & NFSMNT_NFSV3);
147 #endif
148 struct mbuf *mreq, *mrep = NULL, *md, *mb;
149 struct ucred *cred;
150 u_quad_t tquad;
151 struct nfsnode *np;
152
153 #ifndef nolint
154 sfp = (struct nfs_statfs *)0;
155 #endif
156 vp = nmp->nm_vnode;
157 np = VTONFS(vp);
158 cred = crget();
159 cred->cr_ngroups = 0;
160 #ifndef NFS_V2_ONLY
161 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
162 (void)nfs_fsinfo(nmp, vp, cred, p);
163 #endif
164 nfsstats.rpccnt[NFSPROC_FSSTAT]++;
165 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3));
166 nfsm_fhtom(np, v3);
167 nfsm_request(np, NFSPROC_FSSTAT, p, cred);
168 if (v3)
169 nfsm_postop_attr(vp, retattr, 0);
170 if (error) {
171 if (mrep != NULL) {
172 if (mrep->m_next != NULL)
173 printf("nfs_vfsops: nfs_statvfs would lose buffers\n");
174 m_freem(mrep);
175 }
176 goto nfsmout;
177 }
178 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
179 sbp->f_flag = nmp->nm_flag;
180 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize);
181 if (v3) {
182 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE;
183 tquad = fxdr_hyper(&sfp->sf_tbytes);
184 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
185 tquad = fxdr_hyper(&sfp->sf_fbytes);
186 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
187 tquad = fxdr_hyper(&sfp->sf_abytes);
188 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
189 sbp->f_bresvd = sbp->f_bfree - tquad;
190 sbp->f_bavail = tquad;
191 #ifdef COMPAT_20
192 /* Handle older NFS servers returning negative values */
193 if ((quad_t)sbp->f_bavail < 0)
194 sbp->f_bavail = 0;
195 #endif
196 tquad = fxdr_hyper(&sfp->sf_tfiles);
197 sbp->f_files = tquad;
198 tquad = fxdr_hyper(&sfp->sf_ffiles);
199 sbp->f_ffree = tquad;
200 sbp->f_favail = tquad;
201 sbp->f_fresvd = 0;
202 sbp->f_namemax = MAXNAMLEN;
203 } else {
204 sbp->f_bsize = NFS_FABLKSIZE;
205 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
206 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
207 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
208 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
209 sbp->f_fresvd = 0;
210 sbp->f_files = 0;
211 sbp->f_ffree = 0;
212 sbp->f_favail = 0;
213 sbp->f_fresvd = 0;
214 sbp->f_namemax = MAXNAMLEN;
215 }
216 copy_statvfs_info(sbp, mp);
217 nfsm_reqdone;
218 crfree(cred);
219 return (error);
220 }
221
222 #ifndef NFS_V2_ONLY
223 /*
224 * nfs version 3 fsinfo rpc call
225 */
226 int
227 nfs_fsinfo(nmp, vp, cred, p)
228 struct nfsmount *nmp;
229 struct vnode *vp;
230 struct ucred *cred;
231 struct proc *p;
232 {
233 struct nfsv3_fsinfo *fsp;
234 caddr_t cp;
235 int32_t t1, t2;
236 u_int32_t *tl, pref, max;
237 caddr_t bpos, dpos, cp2;
238 int error = 0, retattr;
239 struct mbuf *mreq, *mrep, *md, *mb;
240 u_int64_t maxfsize;
241 struct nfsnode *np = VTONFS(vp);
242
243 nfsstats.rpccnt[NFSPROC_FSINFO]++;
244 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1));
245 nfsm_fhtom(np, 1);
246 nfsm_request(np, NFSPROC_FSINFO, p, cred);
247 nfsm_postop_attr(vp, retattr, 0);
248 if (!error) {
249 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
250 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
251 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 &&
252 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
253 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
254 ~(NFS_FABLKSIZE - 1);
255 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
256 if (max < nmp->nm_wsize && max > 0) {
257 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
258 if (nmp->nm_wsize == 0)
259 nmp->nm_wsize = max;
260 }
261 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
262 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 &&
263 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
264 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
265 ~(NFS_FABLKSIZE - 1);
266 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
267 if (max < nmp->nm_rsize && max > 0) {
268 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
269 if (nmp->nm_rsize == 0)
270 nmp->nm_rsize = max;
271 }
272 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
273 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ)
274 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) &
275 ~(NFS_DIRFRAGSIZ - 1);
276 if (max < nmp->nm_readdirsize && max > 0) {
277 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1);
278 if (nmp->nm_readdirsize == 0)
279 nmp->nm_readdirsize = max;
280 }
281 /* XXX */
282 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
283 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
284 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
285 nmp->nm_maxfilesize = maxfsize;
286 nmp->nm_mountp->mnt_fs_bshift =
287 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
288 nmp->nm_iflag |= NFSMNT_GOTFSINFO;
289 }
290 nfsm_reqdone;
291 return (error);
292 }
293 #endif
294
295 /*
296 * Mount a remote root fs via. NFS. It goes like this:
297 * - Call nfs_boot_init() to fill in the nfs_diskless struct
298 * - build the rootfs mount point and call mountnfs() to do the rest.
299 */
300 int
301 nfs_mountroot()
302 {
303 struct nfs_diskless *nd;
304 struct vattr attr;
305 struct mount *mp;
306 struct vnode *vp;
307 struct proc *procp;
308 long n;
309 int error;
310
311 procp = curproc; /* XXX */
312
313 if (root_device->dv_class != DV_IFNET)
314 return (ENODEV);
315
316 /*
317 * XXX time must be non-zero when we init the interface or else
318 * the arp code will wedge. [Fixed now in if_ether.c]
319 * However, the NFS attribute cache gives false "hits" when
320 * time.tv_sec < NFS_ATTRTIMEO(nmp, np) so keep this in for now.
321 */
322 if (time.tv_sec < NFS_MAXATTRTIMO)
323 time.tv_sec = NFS_MAXATTRTIMO;
324
325 /*
326 * Call nfs_boot_init() to fill in the nfs_diskless struct.
327 * Side effect: Finds and configures a network interface.
328 */
329 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK);
330 memset((caddr_t)nd, 0, sizeof(*nd));
331 error = nfs_boot_init(nd, procp);
332 if (error) {
333 free(nd, M_NFSMNT);
334 return (error);
335 }
336
337 /*
338 * Create the root mount point.
339 */
340 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp);
341 if (error)
342 goto out;
343 printf("root on %s\n", nd->nd_root.ndm_host);
344
345 /*
346 * Link it into the mount list.
347 */
348 simple_lock(&mountlist_slock);
349 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
350 simple_unlock(&mountlist_slock);
351 rootvp = vp;
352 mp->mnt_vnodecovered = NULLVP;
353 vfs_unbusy(mp);
354
355 /* Get root attributes (for the time). */
356 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp);
357 if (error)
358 panic("nfs_mountroot: getattr for root");
359 n = attr.va_atime.tv_sec;
360 #ifdef DEBUG
361 printf("root time: 0x%lx\n", n);
362 #endif
363 setrootfstime(n);
364
365 out:
366 if (error)
367 nfs_boot_cleanup(nd, procp);
368 free(nd, M_NFSMNT);
369 return (error);
370 }
371
372 /*
373 * Internal version of mount system call for diskless setup.
374 * Separate function because we used to call it twice.
375 * (once for root and once for swap)
376 */
377 static int
378 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p)
379 struct nfs_dlmount *ndmntp;
380 const char *mntname; /* mount point name */
381 struct mount **mpp;
382 struct vnode **vpp;
383 struct proc *p;
384 {
385 struct mount *mp;
386 struct mbuf *m;
387 int error;
388
389 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp);
390
391 mp->mnt_op = &nfs_vfsops;
392
393 /*
394 * Historical practice expects NFS root file systems to
395 * be initially mounted r/w.
396 */
397 mp->mnt_flag &= ~MNT_RDONLY;
398
399 /* Get mbuf for server sockaddr. */
400 m = m_get(M_WAIT, MT_SONAME);
401 if (m == NULL)
402 panic("nfs_mountroot: mget soname for %s", mntname);
403 MCLAIM(m, &nfs_mowner);
404 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr,
405 (m->m_len = ndmntp->ndm_args.addr->sa_len));
406
407 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname,
408 ndmntp->ndm_args.hostname, vpp, p);
409 if (error) {
410 mp->mnt_op->vfs_refcount--;
411 vfs_unbusy(mp);
412 printf("nfs_mountroot: mount %s failed: %d\n",
413 mntname, error);
414 free(mp, M_MOUNT);
415 } else
416 *mpp = mp;
417
418 return (error);
419 }
420
421 void
422 nfs_decode_args(nmp, argp, p)
423 struct nfsmount *nmp;
424 struct nfs_args *argp;
425 struct proc *p;
426 {
427 int s;
428 int adjsock;
429 int maxio;
430
431 s = splsoftnet();
432
433 /*
434 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
435 * no sense in that context.
436 */
437 if (argp->sotype == SOCK_STREAM)
438 argp->flags &= ~NFSMNT_NOCONN;
439
440 /*
441 * Cookie translation is not needed for v2, silently ignore it.
442 */
443 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) ==
444 NFSMNT_XLATECOOKIE)
445 argp->flags &= ~NFSMNT_XLATECOOKIE;
446
447 /* Re-bind if rsrvd port requested and wasn't on one */
448 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
449 && (argp->flags & NFSMNT_RESVPORT);
450 /* Also re-bind if we're switching to/from a connected UDP socket */
451 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
452 (argp->flags & NFSMNT_NOCONN));
453
454 /* Update flags. */
455 nmp->nm_flag = argp->flags;
456 splx(s);
457
458 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
459 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
460 if (nmp->nm_timeo < NFS_MINTIMEO)
461 nmp->nm_timeo = NFS_MINTIMEO;
462 else if (nmp->nm_timeo > NFS_MAXTIMEO)
463 nmp->nm_timeo = NFS_MAXTIMEO;
464 }
465
466 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
467 nmp->nm_retry = argp->retrans;
468 if (nmp->nm_retry > NFS_MAXREXMIT)
469 nmp->nm_retry = NFS_MAXREXMIT;
470 }
471
472 #ifndef NFS_V2_ONLY
473 if (argp->flags & NFSMNT_NFSV3) {
474 if (argp->sotype == SOCK_DGRAM)
475 maxio = NFS_MAXDGRAMDATA;
476 else
477 maxio = NFS_MAXDATA;
478 } else
479 #endif
480 maxio = NFS_V2MAXDATA;
481
482 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
483 int osize = nmp->nm_wsize;
484 nmp->nm_wsize = argp->wsize;
485 /* Round down to multiple of blocksize */
486 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
487 if (nmp->nm_wsize <= 0)
488 nmp->nm_wsize = NFS_FABLKSIZE;
489 adjsock |= (nmp->nm_wsize != osize);
490 }
491 if (nmp->nm_wsize > maxio)
492 nmp->nm_wsize = maxio;
493 if (nmp->nm_wsize > MAXBSIZE)
494 nmp->nm_wsize = MAXBSIZE;
495
496 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
497 int osize = nmp->nm_rsize;
498 nmp->nm_rsize = argp->rsize;
499 /* Round down to multiple of blocksize */
500 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
501 if (nmp->nm_rsize <= 0)
502 nmp->nm_rsize = NFS_FABLKSIZE;
503 adjsock |= (nmp->nm_rsize != osize);
504 }
505 if (nmp->nm_rsize > maxio)
506 nmp->nm_rsize = maxio;
507 if (nmp->nm_rsize > MAXBSIZE)
508 nmp->nm_rsize = MAXBSIZE;
509
510 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
511 nmp->nm_readdirsize = argp->readdirsize;
512 /* Round down to multiple of minimum blocksize */
513 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1);
514 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ)
515 nmp->nm_readdirsize = NFS_DIRFRAGSIZ;
516 /* Bigger than buffer size makes no sense */
517 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ)
518 nmp->nm_readdirsize = NFS_DIRBLKSIZ;
519 } else if (argp->flags & NFSMNT_RSIZE)
520 nmp->nm_readdirsize = nmp->nm_rsize;
521
522 if (nmp->nm_readdirsize > maxio)
523 nmp->nm_readdirsize = maxio;
524
525 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
526 argp->maxgrouplist <= NFS_MAXGRPS)
527 nmp->nm_numgrps = argp->maxgrouplist;
528 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
529 argp->readahead <= NFS_MAXRAHEAD)
530 nmp->nm_readahead = argp->readahead;
531 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 &&
532 argp->leaseterm <= NQ_MAXLEASE)
533 nmp->nm_leaseterm = argp->leaseterm;
534 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
535 argp->deadthresh <= NQ_NEVERDEAD)
536 nmp->nm_deadthresh = argp->deadthresh;
537
538 adjsock |= ((nmp->nm_sotype != argp->sotype) ||
539 (nmp->nm_soproto != argp->proto));
540 nmp->nm_sotype = argp->sotype;
541 nmp->nm_soproto = argp->proto;
542
543 if (nmp->nm_so && adjsock) {
544 nfs_safedisconnect(nmp);
545 if (nmp->nm_sotype == SOCK_DGRAM)
546 while (nfs_connect(nmp, (struct nfsreq *)0, p)) {
547 printf("nfs_args: retrying connect\n");
548 (void) tsleep((caddr_t)&lbolt,
549 PSOCK, "nfscn3", 0);
550 }
551 }
552 }
553
554 /*
555 * VFS Operations.
556 *
557 * mount system call
558 * It seems a bit dumb to copyinstr() the host and path here and then
559 * memcpy() them in mountnfs(), but I wanted to detect errors before
560 * doing the sockargs() call because sockargs() allocates an mbuf and
561 * an error after that means that I have to release the mbuf.
562 */
563 /* ARGSUSED */
564 int
565 nfs_mount(mp, path, data, ndp, p)
566 struct mount *mp;
567 const char *path;
568 void *data;
569 struct nameidata *ndp;
570 struct proc *p;
571 {
572 int error;
573 struct nfs_args args;
574 struct mbuf *nam;
575 struct nfsmount *nmp = VFSTONFS(mp);
576 struct sockaddr *sa;
577 struct vnode *vp;
578 char *pth, *hst;
579 size_t len;
580 u_char *nfh;
581
582 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args));
583 if (error)
584 return (error);
585
586 if (mp->mnt_flag & MNT_GETARGS) {
587
588 if (nmp == NULL)
589 return (EIO);
590 if (args.addr != NULL) {
591 sa = mtod(nmp->nm_nam, struct sockaddr *);
592 error = copyout(sa, args.addr, sa->sa_len);
593 if (error)
594 return (error);
595 args.addrlen = sa->sa_len;
596 } else
597 args.addrlen = 0;
598
599 args.version = NFS_ARGSVERSION;
600 args.sotype = nmp->nm_sotype;
601 args.proto = nmp->nm_soproto;
602 args.fh = NULL;
603 args.fhsize = 0;
604 args.flags = nmp->nm_flag;
605 args.wsize = nmp->nm_wsize;
606 args.rsize = nmp->nm_rsize;
607 args.readdirsize = nmp->nm_readdirsize;
608 args.timeo = nmp->nm_timeo;
609 args.retrans = nmp->nm_retry;
610 args.maxgrouplist = nmp->nm_numgrps;
611 args.readahead = nmp->nm_readahead;
612 args.leaseterm = nmp->nm_leaseterm;
613 args.deadthresh = nmp->nm_deadthresh;
614 args.hostname = NULL;
615 return (copyout(&args, data, sizeof(args)));
616 }
617
618 if (args.version != NFS_ARGSVERSION)
619 return (EPROGMISMATCH);
620 #ifdef NFS_V2_ONLY
621 if (args.flags & NFSMNT_NQNFS)
622 return (EPROGUNAVAIL);
623 if (args.flags & NFSMNT_NFSV3)
624 return (EPROGMISMATCH);
625 #endif
626 if (mp->mnt_flag & MNT_UPDATE) {
627 if (nmp == NULL)
628 return (EIO);
629 /*
630 * When doing an update, we can't change from or to
631 * v3 and/or nqnfs, or change cookie translation
632 */
633 args.flags = (args.flags &
634 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) |
635 (nmp->nm_flag &
636 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE));
637 nfs_decode_args(nmp, &args, p);
638 return (0);
639 }
640 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX)
641 return (EINVAL);
642 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK);
643 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
644 if (error)
645 return (error);
646 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK);
647 error = copyinstr(path, pth, MNAMELEN - 1, &len);
648 if (error)
649 goto free_nfh;
650 memset(&pth[len], 0, MNAMELEN - len);
651 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK);
652 error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len);
653 if (error)
654 goto free_pth;
655 memset(&hst[len], 0, MNAMELEN - len);
656 /* sockargs() call must be after above copyin() calls */
657 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME);
658 if (error)
659 goto free_hst;
660 MCLAIM(nam, &nfs_mowner);
661 args.fh = nfh;
662 error = mountnfs(&args, mp, nam, pth, hst, &vp, p);
663
664 free_hst:
665 FREE(hst, M_TEMP);
666 free_pth:
667 FREE(pth, M_TEMP);
668 free_nfh:
669 FREE(nfh, M_TEMP);
670
671 return (error);
672 }
673
674 /*
675 * Common code for mount and mountroot
676 */
677 int
678 mountnfs(argp, mp, nam, pth, hst, vpp, p)
679 struct nfs_args *argp;
680 struct mount *mp;
681 struct mbuf *nam;
682 const char *pth, *hst;
683 struct vnode **vpp;
684 struct proc *p;
685 {
686 struct nfsmount *nmp;
687 struct nfsnode *np;
688 int error;
689 struct vattr *attrs;
690 struct ucred *cr;
691
692 /*
693 * If the number of nfs iothreads to use has never
694 * been set, create a reasonable number of them.
695 */
696
697 if (nfs_niothreads < 0) {
698 nfs_niothreads = NFS_DEFAULT_NIOTHREADS;
699 nfs_getset_niothreads(TRUE);
700 }
701
702 if (mp->mnt_flag & MNT_UPDATE) {
703 nmp = VFSTONFS(mp);
704 /* update paths, file handles, etc, here XXX */
705 m_freem(nam);
706 return (0);
707 } else {
708 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount),
709 M_NFSMNT, M_WAITOK);
710 memset((caddr_t)nmp, 0, sizeof (struct nfsmount));
711 mp->mnt_data = nmp;
712 TAILQ_INIT(&nmp->nm_uidlruhead);
713 TAILQ_INIT(&nmp->nm_bufq);
714 lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0);
715 simple_lock_init(&nmp->nm_slock);
716 }
717 vfs_getnewfsid(mp);
718 nmp->nm_mountp = mp;
719
720 #ifndef NFS_V2_ONLY
721 if (argp->flags & NFSMNT_NQNFS)
722 mp->mnt_iflag |= IMNT_DTYPE;
723 #endif
724
725 #ifndef NFS_V2_ONLY
726 if ((argp->flags & NFSMNT_NFSV3) == 0)
727 #endif
728 /*
729 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
730 * will fill this in.
731 */
732 nmp->nm_maxfilesize = 0xffffffffLL;
733
734 nmp->nm_timeo = NFS_TIMEO;
735 nmp->nm_retry = NFS_RETRANS;
736 nmp->nm_wsize = NFS_WSIZE;
737 nmp->nm_rsize = NFS_RSIZE;
738 nmp->nm_readdirsize = NFS_READDIRSIZE;
739 nmp->nm_numgrps = NFS_MAXGRPS;
740 nmp->nm_readahead = NFS_DEFRAHEAD;
741 nmp->nm_leaseterm = NQ_DEFLEASE;
742 nmp->nm_deadthresh = NQ_DEADTHRESH;
743 CIRCLEQ_INIT(&nmp->nm_timerhead);
744 nmp->nm_inprog = NULLVP;
745 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, p);
746 if (error)
747 goto bad;
748 nmp->nm_nam = nam;
749
750 /* Set up the sockets and per-host congestion */
751 nmp->nm_sotype = argp->sotype;
752 nmp->nm_soproto = argp->proto;
753
754 nfs_decode_args(nmp, argp, p);
755
756 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
757 mp->mnt_dev_bshift = DEV_BSHIFT;
758
759 /*
760 * For Connection based sockets (TCP,...) defer the connect until
761 * the first request, in case the server is not responding.
762 */
763 if (nmp->nm_sotype == SOCK_DGRAM &&
764 (error = nfs_connect(nmp, (struct nfsreq *)0, p)))
765 goto bad;
766
767 /*
768 * This is silly, but it has to be set so that vinifod() works.
769 * We do not want to do an nfs_statvfs() here since we can get
770 * stuck on a dead server and we are holding a lock on the mount
771 * point.
772 */
773 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA;
774 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np);
775 if (error)
776 goto bad;
777 *vpp = NFSTOV(np);
778 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK);
779 VOP_GETATTR(*vpp, attrs, p->p_ucred, p);
780 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) {
781 cr = crget();
782 cr->cr_uid = attrs->va_uid;
783 cr->cr_gid = attrs->va_gid;
784 cr->cr_ngroups = 0;
785 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr);
786 crfree(cr);
787 }
788 FREE(attrs, M_TEMP);
789
790 /*
791 * A reference count is needed on the nfsnode representing the
792 * remote root. If this object is not persistent, then backward
793 * traversals of the mount point (i.e. "..") will not work if
794 * the nfsnode gets flushed out of the cache. Ufs does not have
795 * this problem, because one can identify root inodes by their
796 * number == ROOTINO (2). So, just unlock, but no rele.
797 */
798
799 nmp->nm_vnode = *vpp;
800 VOP_UNLOCK(*vpp, 0);
801
802 return (0);
803 bad:
804 nfs_disconnect(nmp);
805 free((caddr_t)nmp, M_NFSMNT);
806 m_freem(nam);
807 return (error);
808 }
809
810 /*
811 * unmount system call
812 */
813 int
814 nfs_unmount(mp, mntflags, p)
815 struct mount *mp;
816 int mntflags;
817 struct proc *p;
818 {
819 struct nfsmount *nmp;
820 struct vnode *vp;
821 int error, flags = 0;
822
823 if (mntflags & MNT_FORCE)
824 flags |= FORCECLOSE;
825 nmp = VFSTONFS(mp);
826 /*
827 * Goes something like this..
828 * - Check for activity on the root vnode (other than ourselves).
829 * - Call vflush() to clear out vnodes for this file system,
830 * except for the root vnode.
831 * - Decrement reference on the vnode representing remote root.
832 * - Close the socket
833 * - Free up the data structures
834 */
835 /*
836 * We need to decrement the ref. count on the nfsnode representing
837 * the remote root. See comment in mountnfs(). The VFS unmount()
838 * has done vput on this vnode, otherwise we would get deadlock!
839 */
840 vp = nmp->nm_vnode;
841 error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
842 if (error != 0)
843 return error;
844
845 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) {
846 vput(vp);
847 return (EBUSY);
848 }
849
850 /*
851 * Must handshake with nqnfs_clientd() if it is active.
852 */
853 nmp->nm_iflag |= NFSMNT_DISMINPROG;
854 while (nmp->nm_inprog != NULLVP)
855 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0);
856 error = vflush(mp, vp, flags);
857 if (error) {
858 vput(vp);
859 nmp->nm_iflag &= ~NFSMNT_DISMINPROG;
860 return (error);
861 }
862
863 /*
864 * We are now committed to the unmount; mark the mount structure
865 * as doomed so that any sleepers kicked awake by nfs_disconnect
866 * will go away cleanly.
867 */
868 nmp->nm_iflag |= NFSMNT_DISMNT;
869
870 /*
871 * There are two reference counts to get rid of here
872 * (see comment in mountnfs()).
873 */
874 vrele(vp);
875 vput(vp);
876 vgone(vp);
877 nfs_disconnect(nmp);
878 m_freem(nmp->nm_nam);
879
880 /*
881 * For NQNFS, let the server daemon free the nfsmount structure.
882 */
883 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0)
884 free((caddr_t)nmp, M_NFSMNT);
885 return (0);
886 }
887
888 /*
889 * Return root of a filesystem
890 */
891 int
892 nfs_root(mp, vpp)
893 struct mount *mp;
894 struct vnode **vpp;
895 {
896 struct vnode *vp;
897 struct nfsmount *nmp;
898 int error;
899
900 nmp = VFSTONFS(mp);
901 vp = nmp->nm_vnode;
902 error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
903 if (error != 0)
904 return error;
905 if (vp->v_type == VNON)
906 vp->v_type = VDIR;
907 vp->v_flag = VROOT;
908 *vpp = vp;
909 return (0);
910 }
911
912 extern int syncprt;
913
914 /*
915 * Flush out the buffer cache
916 */
917 /* ARGSUSED */
918 int
919 nfs_sync(mp, waitfor, cred, p)
920 struct mount *mp;
921 int waitfor;
922 struct ucred *cred;
923 struct proc *p;
924 {
925 struct vnode *vp;
926 int error, allerror = 0;
927
928 /*
929 * Force stale buffer cache information to be flushed.
930 */
931 loop:
932 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) {
933 /*
934 * If the vnode that we are about to sync is no longer
935 * associated with this mount point, start over.
936 */
937 if (vp->v_mount != mp)
938 goto loop;
939 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) ||
940 (LIST_EMPTY(&vp->v_dirtyblkhd) &&
941 vp->v_uobj.uo_npages == 0))
942 continue;
943 if (vget(vp, LK_EXCLUSIVE))
944 goto loop;
945 error = VOP_FSYNC(vp, cred,
946 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p);
947 if (error)
948 allerror = error;
949 vput(vp);
950 }
951 return (allerror);
952 }
953
954 /*
955 * NFS flat namespace lookup.
956 * Currently unsupported.
957 */
958 /* ARGSUSED */
959 int
960 nfs_vget(mp, ino, vpp)
961 struct mount *mp;
962 ino_t ino;
963 struct vnode **vpp;
964 {
965
966 return (EOPNOTSUPP);
967 }
968
969 /*
970 * Do that sysctl thang...
971 */
972 static int
973 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS)
974 {
975 int error;
976
977 nfs_getset_niothreads(0);
978 error = sysctl_lookup(SYSCTLFN_CALL(rnode));
979 if (error || newp == NULL)
980 return (error);
981 nfs_getset_niothreads(1);
982
983 return (0);
984 }
985
986 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup")
987 {
988
989 sysctl_createv(clog, 0, NULL, NULL,
990 CTLFLAG_PERMANENT,
991 CTLTYPE_NODE, "vfs", NULL,
992 NULL, 0, NULL, 0,
993 CTL_VFS, CTL_EOL);
994 sysctl_createv(clog, 0, NULL, NULL,
995 CTLFLAG_PERMANENT,
996 CTLTYPE_NODE, "nfs",
997 SYSCTL_DESCR("NFS vfs options"),
998 NULL, 0, NULL, 0,
999 CTL_VFS, 2, CTL_EOL);
1000 /*
1001 * XXX the "2" above could be dynamic, thereby eliminating one
1002 * more instance of the "number to vfs" mapping problem, but
1003 * "2" is the order as taken from sys/mount.h
1004 */
1005
1006 sysctl_createv(clog, 0, NULL, NULL,
1007 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1008 CTLTYPE_STRUCT, "nfsstats",
1009 SYSCTL_DESCR("NFS operation statistics"),
1010 NULL, 0, &nfsstats, sizeof(nfsstats),
1011 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL);
1012 sysctl_createv(clog, 0, NULL, NULL,
1013 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1014 CTLTYPE_INT, "iothreads",
1015 SYSCTL_DESCR("Number of NFS client processes desired"),
1016 sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0,
1017 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL);
1018 }
1019
1020 /*
1021 * At this point, this should never happen
1022 */
1023 /* ARGSUSED */
1024 int
1025 nfs_fhtovp(mp, fhp, vpp)
1026 struct mount *mp;
1027 struct fid *fhp;
1028 struct vnode **vpp;
1029 {
1030
1031 return (EINVAL);
1032 }
1033
1034 /* ARGSUSED */
1035 int
1036 nfs_checkexp(mp, nam, exflagsp, credanonp)
1037 struct mount *mp;
1038 struct mbuf *nam;
1039 int *exflagsp;
1040 struct ucred **credanonp;
1041 {
1042
1043 return (EINVAL);
1044 }
1045
1046 /*
1047 * Vnode pointer to File handle, should never happen either
1048 */
1049 /* ARGSUSED */
1050 int
1051 nfs_vptofh(vp, fhp)
1052 struct vnode *vp;
1053 struct fid *fhp;
1054 {
1055
1056 return (EINVAL);
1057 }
1058
1059 /*
1060 * Vfs start routine, a no-op.
1061 */
1062 /* ARGSUSED */
1063 int
1064 nfs_start(mp, flags, p)
1065 struct mount *mp;
1066 int flags;
1067 struct proc *p;
1068 {
1069
1070 return (0);
1071 }
1072
1073 /*
1074 * Do operations associated with quotas, not supported
1075 */
1076 /* ARGSUSED */
1077 int
1078 nfs_quotactl(mp, cmd, uid, arg, p)
1079 struct mount *mp;
1080 int cmd;
1081 uid_t uid;
1082 void *arg;
1083 struct proc *p;
1084 {
1085
1086 return (EOPNOTSUPP);
1087 }
Cache object: 84bf3866c320638289566705415d2e33
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