1/* $NetBSD: nfs_vfsops.c,v 1.231 2015/11/02 09:57:43 pgoyette 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 1.231 2015/11/02 09:57:43 pgoyette Exp $");
39
40#if defined(_KERNEL_OPT)
41#include "opt_nfs.h"
42#endif
43
44#include <sys/param.h>
45#include <sys/ioctl.h>
46#include <sys/signal.h>
47#include <sys/proc.h>
48#include <sys/namei.h>
49#include <sys/device.h>
50#include <sys/vnode.h>
51#include <sys/kernel.h>
52#include <sys/mount.h>
53#include <sys/buf.h>
54#include <sys/mbuf.h>
55#include <sys/dirent.h>
56#include <sys/socket.h>
57#include <sys/socketvar.h>
58#include <sys/sysctl.h>
59#include <sys/systm.h>
60#include <sys/timetc.h>
61#include <sys/kauth.h>
62#include <sys/module.h>
63
64#include <net/if.h>
65#include <net/route.h>
66#include <netinet/in.h>
67
68#include <nfs/rpcv2.h>
69#include <nfs/nfsproto.h>
70#include <nfs/nfsnode.h>
71#include <nfs/nfs.h>
72#include <nfs/nfsmount.h>
73#include <nfs/xdr_subs.h>
74#include <nfs/nfsm_subs.h>
75#include <nfs/nfsdiskless.h>
76#include <nfs/nfs_var.h>
77
78MODULE(MODULE_CLASS_VFS, nfs, NULL);
79
80extern struct nfsstats nfsstats;
81extern int nfs_ticks;
82
83/*
84 * keep a count of the nfs mounts to generate ficticious drive names
85 * for the per drive stats.
86 */
87unsigned int nfs_mount_count = 0;
88
89int nfs_commitsize;
90
91/*
92 * nfs vfs operations.
93 */
94
95extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc;
96extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc;
97extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc;
98
99const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = {
100 &nfsv2_vnodeop_opv_desc,
101 &spec_nfsv2nodeop_opv_desc,
102 &fifo_nfsv2nodeop_opv_desc,
103 NULL,
104};
105
106struct vfsops nfs_vfsops = {
107 .vfs_name = MOUNT_NFS,
108 .vfs_min_mount_data = sizeof (struct nfs_args),
109 .vfs_mount = nfs_mount,
110 .vfs_start = nfs_start,
111 .vfs_unmount = nfs_unmount,
112 .vfs_root = nfs_root,
113 .vfs_quotactl = (void *)eopnotsupp,
114 .vfs_statvfs = nfs_statvfs,
115 .vfs_sync = nfs_sync,
116 .vfs_loadvnode = nfs_loadvnode,
117 .vfs_vget = nfs_vget,
118 .vfs_fhtovp = nfs_fhtovp,
119 .vfs_vptofh = nfs_vptofh,
120 .vfs_init = nfs_vfs_init,
121 .vfs_done = nfs_vfs_done,
122 .vfs_mountroot = nfs_mountroot,
123 .vfs_snapshot = (void *)eopnotsupp,
124 .vfs_extattrctl = vfs_stdextattrctl,
125 .vfs_suspendctl = (void *)eopnotsupp,
126 .vfs_renamelock_enter = genfs_renamelock_enter,
127 .vfs_renamelock_exit = genfs_renamelock_exit,
128 .vfs_fsync = (void *)eopnotsupp,
129 .vfs_opv_descs = nfs_vnodeopv_descs
130};
131
132extern u_int32_t nfs_procids[NFS_NPROCS];
133extern u_int32_t nfs_prog, nfs_vers;
134static struct sysctllog *nfs_clog;
135
136static int nfs_mount_diskless(struct nfs_dlmount *, const char *,
137 struct mount **, struct vnode **, struct lwp *);
138static void nfs_sysctl_init(void);
139static void nfs_sysctl_fini(void);
140
141static int
142nfs_modcmd(modcmd_t cmd, void *arg)
143{
144 int error;
145
146 switch (cmd) {
147 case MODULE_CMD_INIT:
148 error = vfs_attach(&nfs_vfsops);
149 if (error == 0) {
150 nfs_sysctl_init();
151 }
152 return error;
153 case MODULE_CMD_FINI:
154 error = vfs_detach(&nfs_vfsops);
155 if (error == 0) {
156 nfs_sysctl_fini();
157 }
158 return error;
159 default:
160 return ENOTTY;
161 }
162}
163
164/*
165 * nfs statvfs call
166 */
167int
168nfs_statvfs(struct mount *mp, struct statvfs *sbp)
169{
170 struct lwp *l = curlwp;
171 struct vnode *vp;
172 struct nfs_statfs *sfp;
173 char *cp;
174 u_int32_t *tl;
175 int32_t t1, t2;
176 char *bpos, *dpos, *cp2;
177 struct nfsmount *nmp = VFSTONFS(mp);
178 int error = 0, retattr;
179#ifdef NFS_V2_ONLY
180 const int v3 = 0;
181#else
182 int v3 = (nmp->nm_flag & NFSMNT_NFSV3);
183#endif
184 struct mbuf *mreq, *mrep = NULL, *md, *mb;
185 kauth_cred_t cred;
186 u_quad_t tquad;
187 struct nfsnode *np;
188
189#ifndef nolint
190 sfp = (struct nfs_statfs *)0;
191#endif
192 vp = nmp->nm_vnode;
193 np = VTONFS(vp);
194 cred = kauth_cred_alloc();
195#ifndef NFS_V2_ONLY
196 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
197 (void)nfs_fsinfo(nmp, vp, cred, l);
198#endif
199 nfsstats.rpccnt[NFSPROC_FSSTAT]++;
200 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3));
201 nfsm_fhtom(np, v3);
202 nfsm_request(np, NFSPROC_FSSTAT, l, cred);
203 if (v3)
204 nfsm_postop_attr(vp, retattr, 0);
205 if (error) {
206 if (mrep != NULL) {
207 if (mrep->m_next != NULL)
208 printf("nfs_vfsops: nfs_statvfs would lose buffers\n");
209 m_freem(mrep);
210 }
211 goto nfsmout;
212 }
213 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
214 sbp->f_flag = nmp->nm_flag;
215 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize);
216 if (v3) {
217 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE;
218 tquad = fxdr_hyper(&sfp->sf_tbytes);
219 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
220 tquad = fxdr_hyper(&sfp->sf_fbytes);
221 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
222 tquad = fxdr_hyper(&sfp->sf_abytes);
223 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
224 sbp->f_bresvd = sbp->f_bfree - tquad;
225 sbp->f_bavail = tquad;
226 /* Handle older NFS servers returning negative values */
227 if ((quad_t)sbp->f_bavail < 0)
228 sbp->f_bavail = 0;
229 tquad = fxdr_hyper(&sfp->sf_tfiles);
230 sbp->f_files = tquad;
231 tquad = fxdr_hyper(&sfp->sf_ffiles);
232 sbp->f_ffree = tquad;
233 sbp->f_favail = tquad;
234 sbp->f_fresvd = 0;
235 sbp->f_namemax = NFS_MAXNAMLEN;
236 } else {
237 sbp->f_bsize = NFS_FABLKSIZE;
238 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
239 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
240 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
241 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
242 sbp->f_fresvd = 0;
243 sbp->f_files = 0;
244 sbp->f_ffree = 0;
245 sbp->f_favail = 0;
246 sbp->f_fresvd = 0;
247 sbp->f_namemax = NFS_MAXNAMLEN;
248 }
249 copy_statvfs_info(sbp, mp);
250 nfsm_reqdone;
251 kauth_cred_free(cred);
252 return (error);
253}
254
255#ifndef NFS_V2_ONLY
256/*
257 * nfs version 3 fsinfo rpc call
258 */
259int
260nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l)
261{
262 struct nfsv3_fsinfo *fsp;
263 char *cp;
264 int32_t t1, t2;
265 u_int32_t *tl, pref, xmax;
266 char *bpos, *dpos, *cp2;
267 int error = 0, retattr;
268 struct mbuf *mreq, *mrep, *md, *mb;
269 u_int64_t maxfsize;
270 struct nfsnode *np = VTONFS(vp);
271
272 nfsstats.rpccnt[NFSPROC_FSINFO]++;
273 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1));
274 nfsm_fhtom(np, 1);
275 nfsm_request(np, NFSPROC_FSINFO, l, cred);
276 nfsm_postop_attr(vp, retattr, 0);
277 if (!error) {
278 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
279 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
280 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 &&
281 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
282 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
283 ~(NFS_FABLKSIZE - 1);
284 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
285 if (xmax < nmp->nm_wsize && xmax > 0) {
286 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1);
287 if (nmp->nm_wsize == 0)
288 nmp->nm_wsize = xmax;
289 }
290 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
291 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 &&
292 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
293 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
294 ~(NFS_FABLKSIZE - 1);
295 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
296 if (xmax < nmp->nm_rsize && xmax > 0) {
297 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1);
298 if (nmp->nm_rsize == 0)
299 nmp->nm_rsize = xmax;
300 }
301 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
302 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ)
303 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) &
304 ~(NFS_DIRFRAGSIZ - 1);
305 if (xmax < nmp->nm_readdirsize && xmax > 0) {
306 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1);
307 if (nmp->nm_readdirsize == 0)
308 nmp->nm_readdirsize = xmax;
309 }
310 /* XXX */
311 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
312 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
313 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
314 nmp->nm_maxfilesize = maxfsize;
315 nmp->nm_mountp->mnt_fs_bshift =
316 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
317 nmp->nm_iflag |= NFSMNT_GOTFSINFO;
318 }
319 nfsm_reqdone;
320 return (error);
321}
322#endif
323
324/*
325 * Mount a remote root fs via. NFS. It goes like this:
326 * - Call nfs_boot_init() to fill in the nfs_diskless struct
327 * - build the rootfs mount point and call mountnfs() to do the rest.
328 */
329int
330nfs_mountroot(void)
331{
332 struct timespec ts;
333 struct nfs_diskless *nd;
334 struct vattr attr;
335 struct mount *mp;
336 struct vnode *vp;
337 struct lwp *l;
338 long n;
339 int error;
340
341 l = curlwp; /* XXX */
342
343 if (device_class(root_device) != DV_IFNET)
344 return (ENODEV);
345
346 /*
347 * XXX time must be non-zero when we init the interface or else
348 * the arp code will wedge. [Fixed now in if_ether.c]
349 * However, the NFS attribute cache gives false "hits" when the
350 * current time < nfs_attrtimeo(nmp, np) so keep this in for now.
351 */
352 if (time_second < NFS_MAXATTRTIMO) {
353 ts.tv_sec = NFS_MAXATTRTIMO;
354 ts.tv_nsec = 0;
355 tc_setclock(&ts);
356 }
357
358 /*
359 * Call nfs_boot_init() to fill in the nfs_diskless struct.
360 * Side effect: Finds and configures a network interface.
361 */
362 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP);
363 error = nfs_boot_init(nd, l);
364 if (error) {
365 kmem_free(nd, sizeof(*nd));
366 return (error);
367 }
368
369 /*
370 * Create the root mount point.
371 */
372 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l);
373 if (error)
374 goto out;
375 printf("root on %s\n", nd->nd_root.ndm_host);
376
377 /*
378 * Link it into the mount list.
379 */
380 mountlist_append(mp);
381 rootvp = vp;
382 mp->mnt_vnodecovered = NULLVP;
383 vfs_unbusy(mp, false, NULL);
384
385 /* Get root attributes (for the time). */
386 vn_lock(vp, LK_SHARED | LK_RETRY);
387 error = VOP_GETATTR(vp, &attr, l->l_cred);
388 VOP_UNLOCK(vp);
389 if (error)
390 panic("nfs_mountroot: getattr for root");
391 n = attr.va_atime.tv_sec;
392#ifdef DEBUG
393 printf("root time: 0x%lx\n", n);
394#endif
395 setrootfstime(n);
396
397out:
398 if (error)
399 nfs_boot_cleanup(nd, l);
400 kmem_free(nd, sizeof(*nd));
401 return (error);
402}
403
404/*
405 * Internal version of mount system call for diskless setup.
406 * Separate function because we used to call it twice.
407 * (once for root and once for swap)
408 */
409static int
410nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l)
411 /* mntname: mount point name */
412{
413 struct mount *mp;
414 struct mbuf *m;
415 int error;
416
417 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp);
418
419 mp->mnt_op = &nfs_vfsops;
420
421 /*
422 * Historical practice expects NFS root file systems to
423 * be initially mounted r/w.
424 */
425 mp->mnt_flag &= ~MNT_RDONLY;
426
427 /* Get mbuf for server sockaddr. */
428 m = m_get(M_WAIT, MT_SONAME);
429 if (m == NULL)
430 panic("nfs_mountroot: mget soname for %s", mntname);
431 MCLAIM(m, &nfs_mowner);
432 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr,
433 (m->m_len = ndmntp->ndm_args.addr->sa_len));
434
435 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname,
436 ndmntp->ndm_args.hostname, vpp, l);
437 if (error) {
438 vfs_unbusy(mp, false, NULL);
439 vfs_destroy(mp);
440 printf("nfs_mountroot: mount %s failed: %d\n",
441 mntname, error);
442 } else
443 *mpp = mp;
444
445 return (error);
446}
447
448void
449nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l)
450{
451 int s;
452 int adjsock;
453 int maxio;
454
455 s = splsoftnet();
456
457 /*
458 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
459 * no sense in that context.
460 */
461 if (argp->sotype == SOCK_STREAM)
462 argp->flags &= ~NFSMNT_NOCONN;
463
464 /*
465 * Cookie translation is not needed for v2, silently ignore it.
466 */
467 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) ==
468 NFSMNT_XLATECOOKIE)
469 argp->flags &= ~NFSMNT_XLATECOOKIE;
470
471 /* Re-bind if rsrvd port requested and wasn't on one */
472 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
473 && (argp->flags & NFSMNT_RESVPORT);
474 /* Also re-bind if we're switching to/from a connected UDP socket */
475 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
476 (argp->flags & NFSMNT_NOCONN));
477
478 /* Update flags. */
479 nmp->nm_flag = argp->flags;
480 splx(s);
481
482 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
483 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
484 if (nmp->nm_timeo < NFS_MINTIMEO)
485 nmp->nm_timeo = NFS_MINTIMEO;
486 else if (nmp->nm_timeo > NFS_MAXTIMEO)
487 nmp->nm_timeo = NFS_MAXTIMEO;
488 }
489
490 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
491 nmp->nm_retry = argp->retrans;
492 if (nmp->nm_retry > NFS_MAXREXMIT)
493 nmp->nm_retry = NFS_MAXREXMIT;
494 }
495
496#ifndef NFS_V2_ONLY
497 if (argp->flags & NFSMNT_NFSV3) {
498 if (argp->sotype == SOCK_DGRAM)
499 maxio = NFS_MAXDGRAMDATA;
500 else
501 maxio = NFS_MAXDATA;
502 } else
503#endif
504 maxio = NFS_V2MAXDATA;
505
506 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
507 int osize = nmp->nm_wsize;
508 nmp->nm_wsize = argp->wsize;
509 /* Round down to multiple of blocksize */
510 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
511 if (nmp->nm_wsize <= 0)
512 nmp->nm_wsize = NFS_FABLKSIZE;
513 adjsock |= (nmp->nm_wsize != osize);
514 }
515 if (nmp->nm_wsize > maxio)
516 nmp->nm_wsize = maxio;
517 if (nmp->nm_wsize > MAXBSIZE)
518 nmp->nm_wsize = MAXBSIZE;
519
520 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
521 int osize = nmp->nm_rsize;
522 nmp->nm_rsize = argp->rsize;
523 /* Round down to multiple of blocksize */
524 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
525 if (nmp->nm_rsize <= 0)
526 nmp->nm_rsize = NFS_FABLKSIZE;
527 adjsock |= (nmp->nm_rsize != osize);
528 }
529 if (nmp->nm_rsize > maxio)
530 nmp->nm_rsize = maxio;
531 if (nmp->nm_rsize > MAXBSIZE)
532 nmp->nm_rsize = MAXBSIZE;
533
534 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
535 nmp->nm_readdirsize = argp->readdirsize;
536 /* Round down to multiple of minimum blocksize */
537 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1);
538 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ)
539 nmp->nm_readdirsize = NFS_DIRFRAGSIZ;
540 /* Bigger than buffer size makes no sense */
541 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ)
542 nmp->nm_readdirsize = NFS_DIRBLKSIZ;
543 } else if (argp->flags & NFSMNT_RSIZE)
544 nmp->nm_readdirsize = nmp->nm_rsize;
545
546 if (nmp->nm_readdirsize > maxio)
547 nmp->nm_readdirsize = maxio;
548
549 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
550 argp->maxgrouplist <= NFS_MAXGRPS)
551 nmp->nm_numgrps = argp->maxgrouplist;
552 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
553 argp->readahead <= NFS_MAXRAHEAD)
554 nmp->nm_readahead = argp->readahead;
555 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
556 argp->deadthresh <= NFS_NEVERDEAD)
557 nmp->nm_deadthresh = argp->deadthresh;
558
559 adjsock |= ((nmp->nm_sotype != argp->sotype) ||
560 (nmp->nm_soproto != argp->proto));
561 nmp->nm_sotype = argp->sotype;
562 nmp->nm_soproto = argp->proto;
563
564 if (nmp->nm_so && adjsock) {
565 nfs_safedisconnect(nmp);
566 if (nmp->nm_sotype == SOCK_DGRAM)
567 while (nfs_connect(nmp, (struct nfsreq *)0, l)) {
568 printf("nfs_args: retrying connect\n");
569 kpause("nfscn3", false, hz, NULL);
570 }
571 }
572}
573
574/*
575 * VFS Operations.
576 *
577 * mount system call
578 * It seems a bit dumb to copyinstr() the host and path here and then
579 * memcpy() them in mountnfs(), but I wanted to detect errors before
580 * doing the sockargs() call because sockargs() allocates an mbuf and
581 * an error after that means that I have to release the mbuf.
582 */
583/* ARGSUSED */
584int
585nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
586{
587 struct lwp *l = curlwp;
588 int error;
589 struct nfs_args *args = data;
590 struct mbuf *nam;
591 struct nfsmount *nmp = VFSTONFS(mp);
592 struct sockaddr *sa;
593 struct vnode *vp;
594 char *pth, *hst;
595 size_t len;
596 u_char *nfh;
597
598 if (args == NULL)
599 return EINVAL;
600 if (*data_len < sizeof *args)
601 return EINVAL;
602
603 if (mp->mnt_flag & MNT_GETARGS) {
604
605 if (nmp == NULL)
606 return (EIO);
607 if (args->addr != NULL) {
608 sa = mtod(nmp->nm_nam, struct sockaddr *);
609 error = copyout(sa, args->addr, sa->sa_len);
610 if (error)
611 return (error);
612 args->addrlen = sa->sa_len;
613 } else
614 args->addrlen = 0;
615
616 args->version = NFS_ARGSVERSION;
617 args->sotype = nmp->nm_sotype;
618 args->proto = nmp->nm_soproto;
619 args->fh = NULL;
620 args->fhsize = 0;
621 args->flags = nmp->nm_flag;
622 args->wsize = nmp->nm_wsize;
623 args->rsize = nmp->nm_rsize;
624 args->readdirsize = nmp->nm_readdirsize;
625 args->timeo = nmp->nm_timeo;
626 args->retrans = nmp->nm_retry;
627 args->maxgrouplist = nmp->nm_numgrps;
628 args->readahead = nmp->nm_readahead;
629 args->leaseterm = 0; /* dummy */
630 args->deadthresh = nmp->nm_deadthresh;
631 args->hostname = NULL;
632 *data_len = sizeof *args;
633 return 0;
634 }
635
636 if (args->version != NFS_ARGSVERSION)
637 return (EPROGMISMATCH);
638 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB))
639 return (EPROGUNAVAIL);
640#ifdef NFS_V2_ONLY
641 if (args->flags & NFSMNT_NFSV3)
642 return (EPROGMISMATCH);
643#endif
644 if (mp->mnt_flag & MNT_UPDATE) {
645 if (nmp == NULL)
646 return (EIO);
647 /*
648 * When doing an update, we can't change from or to
649 * v3, or change cookie translation
650 */
651 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) |
652 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE));
653 nfs_decode_args(nmp, args, l);
654 return (0);
655 }
656 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX)
657 return (EINVAL);
658 nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK);
659 error = copyin(args->fh, nfh, args->fhsize);
660 if (error)
661 goto free_nfh;
662 pth = malloc(MNAMELEN, M_TEMP, M_WAITOK);
663 error = copyinstr(path, pth, MNAMELEN - 1, &len);
664 if (error)
665 goto free_pth;
666 memset(&pth[len], 0, MNAMELEN - len);
667 hst = malloc(MNAMELEN, M_TEMP, M_WAITOK);
668 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len);
669 if (error)
670 goto free_hst;
671 memset(&hst[len], 0, MNAMELEN - len);
672 /* sockargs() call must be after above copyin() calls */
673 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME);
674 if (error)
675 goto free_hst;
676 MCLAIM(nam, &nfs_mowner);
677 args->fh = nfh;
678 error = mountnfs(args, mp, nam, pth, hst, &vp, l);
679
680free_hst:
681 free(hst, M_TEMP);
682free_pth:
683 free(pth, M_TEMP);
684free_nfh:
685 free(nfh, M_TEMP);
686
687 return (error);
688}
689
690/*
691 * Common code for mount and mountroot
692 */
693int
694mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l)
695{
696 struct nfsmount *nmp;
697 struct nfsnode *np;
698 struct vnode *vp;
699 int error;
700 struct vattr *attrs;
701 kauth_cred_t cr;
702 char iosname[IOSTATNAMELEN];
703
704 /*
705 * If the number of nfs iothreads to use has never
706 * been set, create a reasonable number of them.
707 */
708
709 if (nfs_niothreads < 0) {
710 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS);
711 }
712
713 if (mp->mnt_flag & MNT_UPDATE) {
714 nmp = VFSTONFS(mp);
715 /* update paths, file handles, etc, here XXX */
716 m_freem(nam);
717 return (0);
718 } else {
719 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP);
720 mp->mnt_data = nmp;
721 TAILQ_INIT(&nmp->nm_uidlruhead);
722 TAILQ_INIT(&nmp->nm_bufq);
723 rw_init(&nmp->nm_writeverflock);
724 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE);
725 cv_init(&nmp->nm_rcvcv, "nfsrcv");
726 cv_init(&nmp->nm_sndcv, "nfssnd");
727 cv_init(&nmp->nm_aiocv, "nfsaio");
728 cv_init(&nmp->nm_disconcv, "nfsdis");
729 }
730 vfs_getnewfsid(mp);
731 nmp->nm_mountp = mp;
732
733#ifndef NFS_V2_ONLY
734 if ((argp->flags & NFSMNT_NFSV3) == 0)
735#endif
736 {
737 if (argp->fhsize != NFSX_V2FH) {
738 return EINVAL;
739 }
740 }
741
742 /*
743 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
744 * will overwrite this.
745 */
746 nmp->nm_maxfilesize = 0xffffffffLL;
747
748 nmp->nm_timeo = NFS_TIMEO;
749 nmp->nm_retry = NFS_RETRANS;
750 nmp->nm_wsize = NFS_WSIZE;
751 nmp->nm_rsize = NFS_RSIZE;
752 nmp->nm_readdirsize = NFS_READDIRSIZE;
753 nmp->nm_numgrps = NFS_MAXGRPS;
754 nmp->nm_readahead = NFS_DEFRAHEAD;
755 nmp->nm_deadthresh = NFS_DEFDEADTHRESH;
756 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE,
757 mp->mnt_op->vfs_name, mp, l);
758 if (error)
759 goto bad;
760 nmp->nm_nam = nam;
761
762 /* Set up the sockets and per-host congestion */
763 nmp->nm_sotype = argp->sotype;
764 nmp->nm_soproto = argp->proto;
765
766 nfs_decode_args(nmp, argp, l);
767
768 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
769 mp->mnt_dev_bshift = DEV_BSHIFT;
770
771 /*
772 * For Connection based sockets (TCP,...) defer the connect until
773 * the first request, in case the server is not responding.
774 */
775 if (nmp->nm_sotype == SOCK_DGRAM &&
776 (error = nfs_connect(nmp, (struct nfsreq *)0, l)))
777 goto bad;
778
779 /*
780 * This is silly, but it has to be set so that vinifod() works.
781 * We do not want to do an nfs_statvfs() here since we can get
782 * stuck on a dead server and we are holding a lock on the mount
783 * point.
784 */
785 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA;
786 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np);
787 if (error)
788 goto bad;
789 vp = NFSTOV(np);
790 attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK);
791 VOP_GETATTR(vp, attrs, l->l_cred);
792 if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) {
793 cr = kauth_cred_alloc();
794 kauth_cred_setuid(cr, attrs->va_uid);
795 kauth_cred_seteuid(cr, attrs->va_uid);
796 kauth_cred_setsvuid(cr, attrs->va_uid);
797 kauth_cred_setgid(cr, attrs->va_gid);
798 kauth_cred_setegid(cr, attrs->va_gid);
799 kauth_cred_setsvgid(cr, attrs->va_gid);
800 nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr);
801 kauth_cred_free(cr);
802 }
803 free(attrs, M_TEMP);
804
805 /*
806 * A reference count is needed on the nfsnode representing the
807 * remote root. If this object is not persistent, then backward
808 * traversals of the mount point (i.e. "..") will not work if
809 * the nfsnode gets flushed out of the cache. Ufs does not have
810 * this problem, because one can identify root inodes by their
811 * number == UFS_ROOTINO (2). So, just unlock, but no rele.
812 */
813
814 nmp->nm_vnode = vp;
815 if (vp->v_type == VNON)
816 vp->v_type = VDIR;
817 vp->v_vflag |= VV_ROOT;
818 VOP_UNLOCK(vp);
819 *vpp = vp;
820
821 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++);
822 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname);
823
824 return (0);
825bad:
826 nfs_disconnect(nmp);
827 rw_destroy(&nmp->nm_writeverflock);
828 mutex_destroy(&nmp->nm_lock);
829 cv_destroy(&nmp->nm_rcvcv);
830 cv_destroy(&nmp->nm_sndcv);
831 cv_destroy(&nmp->nm_aiocv);
832 cv_destroy(&nmp->nm_disconcv);
833 kmem_free(nmp, sizeof(*nmp));
834 m_freem(nam);
835 return (error);
836}
837
838/*
839 * unmount system call
840 */
841int
842nfs_unmount(struct mount *mp, int mntflags)
843{
844 struct nfsmount *nmp = VFSTONFS(mp);
845 struct vnode *vp;
846 int error, flags = 0;
847
848 if (mntflags & MNT_FORCE) {
849 mutex_enter(&nmp->nm_lock);
850 flags |= FORCECLOSE;
851 nmp->nm_iflag |= NFSMNT_DISMNTFORCE;
852 mutex_exit(&nmp->nm_lock);
853
854 }
855
856 /*
857 * Goes something like this..
858 * - Check for activity on the root vnode (other than ourselves).
859 * - Call vflush() to clear out vnodes for this file system,
860 * except for the root vnode.
861 * - Decrement reference on the vnode representing remote root.
862 * - Close the socket
863 * - Free up the data structures
864 */
865 /*
866 * We need to decrement the ref. count on the nfsnode representing
867 * the remote root. See comment in mountnfs().
868 */
869 vp = nmp->nm_vnode;
870 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
871 if (error != 0)
872 goto err;
873
874 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 1) {
875 VOP_UNLOCK(vp);
876 error = EBUSY;
877 goto err;
878 }
879
880 error = vflush(mp, vp, flags);
881 if (error) {
882 VOP_UNLOCK(vp);
883 goto err;
884 }
885
886 /*
887 * We are now committed to the unmount; mark the mount structure
888 * as doomed so that any sleepers kicked awake by nfs_disconnect
889 * will go away cleanly.
890 */
891 nmp->nm_iflag |= NFSMNT_DISMNT;
892
893 /*
894 * No new async I/O will be added, but await for pending
895 * ones to drain.
896 */
897 while (nfs_iodbusy(nmp))
898 kpause("nfsumnt", false, hz, NULL);
899
900 /*
901 * Clean up the stats... note that we carefully avoid decrementing
902 * nfs_mount_count here for good reason - we may not be unmounting
903 * the last thing mounted.
904 */
905 iostat_free(nmp->nm_stats);
906
907 /*
908 * There is one reference count to get rid of here
909 * (see comment in mountnfs()).
910 */
911 VOP_UNLOCK(vp);
912 vgone(vp);
913 nfs_disconnect(nmp);
914 m_freem(nmp->nm_nam);
915
916 rw_destroy(&nmp->nm_writeverflock);
917 mutex_destroy(&nmp->nm_lock);
918 cv_destroy(&nmp->nm_rcvcv);
919 cv_destroy(&nmp->nm_sndcv);
920 cv_destroy(&nmp->nm_aiocv);
921 cv_destroy(&nmp->nm_disconcv);
922 kmem_free(nmp, sizeof(*nmp));
923 return (0);
924
925err:
926 if (mntflags & MNT_FORCE) {
927 mutex_enter(&nmp->nm_lock);
928 nmp->nm_iflag &= ~NFSMNT_DISMNTFORCE;
929 mutex_exit(&nmp->nm_lock);
930 }
931
932 return error;
933}
934
935/*
936 * Return root of a filesystem
937 */
938int
939nfs_root(struct mount *mp, struct vnode **vpp)
940{
941 struct vnode *vp;
942 struct nfsmount *nmp;
943 int error;
944
945 nmp = VFSTONFS(mp);
946 vp = nmp->nm_vnode;
947 vref(vp);
948 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
949 if (error != 0) {
950 vrele(vp);
951 return error;
952 }
953 *vpp = vp;
954 return (0);
955}
956
957extern int syncprt;
958
959static bool
960nfs_sync_selector(void *cl, struct vnode *vp)
961{
962
963 return !LIST_EMPTY(&vp->v_dirtyblkhd) || !UVM_OBJ_IS_CLEAN(&vp->v_uobj);
964}
965
966/*
967 * Flush out the buffer cache
968 */
969/* ARGSUSED */
970int
971nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
972{
973 struct vnode *vp;
974 struct vnode_iterator *marker;
975 int error, allerror = 0;
976
977 /*
978 * Force stale buffer cache information to be flushed.
979 */
980 vfs_vnode_iterator_init(mp, &marker);
981 while ((vp = vfs_vnode_iterator_next(marker, nfs_sync_selector,
982 NULL)))
983 {
984 error = vn_lock(vp, LK_EXCLUSIVE);
985 if (error) {
986 vrele(vp);
987 continue;
988 }
989 error = VOP_FSYNC(vp, cred,
990 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
991 if (error)
992 allerror = error;
993 vput(vp);
994 }
995 vfs_vnode_iterator_destroy(marker);
996 return allerror;
997}
998
999/*
1000 * NFS flat namespace lookup.
1001 * Currently unsupported.
1002 */
1003/* ARGSUSED */
1004int
1005nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
1006{
1007
1008 return (EOPNOTSUPP);
1009}
1010
1011/*
1012 * Do that sysctl thang...
1013 */
1014static int
1015sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS)
1016{
1017 struct sysctlnode node;
1018 int val;
1019 int error;
1020
1021 val = nfs_niothreads;
1022 node = *rnode;
1023 node.sysctl_data = &val;
1024 error = sysctl_lookup(SYSCTLFN_CALL(&node));
1025 if (error || newp == NULL)
1026 return error;
1027
1028 return nfs_set_niothreads(val);
1029}
1030
1031static void
1032nfs_sysctl_init(void)
1033{
1034
1035 sysctl_createv(&nfs_clog, 0, NULL, NULL,
1036 CTLFLAG_PERMANENT,
1037 CTLTYPE_NODE, "nfs",
1038 SYSCTL_DESCR("NFS vfs options"),
1039 NULL, 0, NULL, 0,
1040 CTL_VFS, 2, CTL_EOL);
1041 /*
1042 * XXX the "2" above could be dynamic, thereby eliminating one
1043 * more instance of the "number to vfs" mapping problem, but
1044 * "2" is the order as taken from sys/mount.h
1045 */
1046
1047 sysctl_createv(&nfs_clog, 0, NULL, NULL,
1048 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1049 CTLTYPE_STRUCT, "nfsstats",
1050 SYSCTL_DESCR("NFS operation statistics"),
1051 NULL, 0, &nfsstats, sizeof(nfsstats),
1052 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL);
1053 sysctl_createv(&nfs_clog, 0, NULL, NULL,
1054 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1055 CTLTYPE_INT, "iothreads",
1056 SYSCTL_DESCR("Number of NFS client processes desired"),
1057 sysctl_vfs_nfs_iothreads, 0, NULL, 0,
1058 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL);
1059}
1060
1061static void
1062nfs_sysctl_fini(void)
1063{
1064
1065 sysctl_teardown(&nfs_clog);
1066}
1067
1068/* ARGSUSED */
1069int
1070nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
1071{
1072 size_t fidsize;
1073 size_t fhsize;
1074 struct nfsnode *np;
1075 int error;
1076 struct vattr va;
1077
1078 fidsize = fid->fid_len;
1079 if (fidsize < sizeof(*fid)) {
1080 return EINVAL;
1081 }
1082 fhsize = fidsize - sizeof(*fid);
1083 if ((fhsize % NFSX_UNSIGNED) != 0) {
1084 return EINVAL;
1085 }
1086 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) {
1087 if (fhsize > NFSX_V3FHMAX || fhsize == 0) {
1088 return EINVAL;
1089 }
1090 } else {
1091 if (fhsize != NFSX_V2FH) {
1092 return EINVAL;
1093 }
1094 }
1095 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np);
1096 if (error) {
1097 return error;
1098 }
1099 *vpp = NFSTOV(np);
1100 error = VOP_GETATTR(*vpp, &va, kauth_cred_get());
1101 if (error != 0) {
1102 vput(*vpp);
1103 *vpp = NULLVP;
1104 }
1105 return error;
1106}
1107
1108/* ARGSUSED */
1109int
1110nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize)
1111{
1112 struct nfsnode *np;
1113 struct fid *fid;
1114 size_t fidsize;
1115 int error = 0;
1116
1117 np = VTONFS(vp);
1118 fidsize = sizeof(*fid) + np->n_fhsize;
1119 if (*bufsize < fidsize) {
1120 error = E2BIG;
1121 }
1122 *bufsize = fidsize;
1123 if (error == 0) {
1124 struct fid fid_store;
1125
1126 fid = &fid_store;
1127 memset(fid, 0, sizeof(*fid));
1128 fid->fid_len = fidsize;
1129 memcpy(buf, fid, sizeof(*fid));
1130 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize);
1131 }
1132 return error;
1133}
1134
1135/*
1136 * Vfs start routine, a no-op.
1137 */
1138/* ARGSUSED */
1139int
1140nfs_start(struct mount *mp, int flags)
1141{
1142
1143 return (0);
1144}
1145
1146/*
1147 * Called once at VFS init to initialize client-specific data structures.
1148 */
1149void
1150nfs_vfs_init(void)
1151{
1152
1153 /* Initialize NFS server / client shared data. */
1154 nfs_init();
1155 nfs_node_init();
1156
1157 /* Initialize the kqueue structures */
1158 nfs_kqinit();
1159 /* Initialize the iod structures */
1160 nfs_iodinit();
1161
1162 nfs_commitsize = uvmexp.npages << (PAGE_SHIFT - 4);
1163}
1164
1165void
1166nfs_vfs_done(void)
1167{
1168
1169 nfs_node_done();
1170 nfs_kqfini();
1171 nfs_iodfini();
1172 nfs_fini();
1173}
1174