1 /* $NetBSD: nfs_vfsops.c,v 1.245 2023/03/21 15:47:46 christos 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 1.245 2023/03/21 15:47:46 christos 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
78 MODULE(MODULE_CLASS_VFS, nfs, NULL);
79
80 extern struct nfsstats nfsstats;
81 extern 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 */
87 unsigned int nfs_mount_count = 0;
88
89 int nfs_commitsize;
90
91 /*
92 * nfs vfs operations.
93 */
94
95 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc;
96 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc;
97 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc;
98
99 const 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
106 struct 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 = genfs_suspendctl,
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
132 extern u_int32_t nfs_procids[NFS_NPROCS];
133 extern u_int32_t nfs_prog, nfs_vers;
134
135 static int nfs_mount_diskless(struct nfs_dlmount *, const char *,
136 struct mount **, struct vnode **, struct lwp *);
137
138 static int
nfs_modcmd(modcmd_t cmd,void * arg)139 nfs_modcmd(modcmd_t cmd, void *arg)
140 {
141 int error;
142
143 switch (cmd) {
144 case MODULE_CMD_INIT:
145 error = vfs_attach(&nfs_vfsops);
146 return error;
147 case MODULE_CMD_FINI:
148 error = vfs_detach(&nfs_vfsops);
149 return error;
150 default:
151 return ENOTTY;
152 }
153 }
154
155 /*
156 * nfs statvfs call
157 */
158 int
nfs_statvfs(struct mount * mp,struct statvfs * sbp)159 nfs_statvfs(struct mount *mp, struct statvfs *sbp)
160 {
161 struct lwp *l = curlwp;
162 struct vnode *vp;
163 struct nfs_statfs *sfp;
164 char *cp;
165 u_int32_t *tl;
166 int32_t t1, t2;
167 char *bpos, *dpos, *cp2;
168 struct nfsmount *nmp = VFSTONFS(mp);
169 int error = 0, retattr;
170 #ifdef NFS_V2_ONLY
171 const int v3 = 0;
172 #else
173 int v3 = (nmp->nm_flag & NFSMNT_NFSV3);
174 #endif
175 struct mbuf *mreq, *mrep = NULL, *md, *mb;
176 kauth_cred_t cred;
177 u_quad_t tquad;
178 struct nfsnode *np;
179
180 #ifndef nolint
181 sfp = (struct nfs_statfs *)0;
182 #endif
183 vp = nmp->nm_vnode;
184 np = VTONFS(vp);
185 cred = kauth_cred_alloc();
186 #ifndef NFS_V2_ONLY
187 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
188 (void)nfs_fsinfo(nmp, vp, cred, l);
189 #endif
190 nfsstats.rpccnt[NFSPROC_FSSTAT]++;
191 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3));
192 nfsm_fhtom(np, v3);
193 nfsm_request(np, NFSPROC_FSSTAT, l, cred);
194 if (v3)
195 nfsm_postop_attr(vp, retattr, 0);
196 if (error) {
197 if (mrep != NULL) {
198 if (mrep->m_next != NULL)
199 printf("nfs_vfsops: nfs_statvfs would lose buffers\n");
200 m_freem(mrep);
201 }
202 goto nfsmout;
203 }
204 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
205 sbp->f_flag = nmp->nm_flag;
206 sbp->f_iosize = uimin(nmp->nm_rsize, nmp->nm_wsize);
207 if (v3) {
208 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE;
209 tquad = fxdr_hyper(&sfp->sf_tbytes);
210 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
211 tquad = fxdr_hyper(&sfp->sf_fbytes);
212 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
213 tquad = fxdr_hyper(&sfp->sf_abytes);
214 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
215 sbp->f_bresvd = sbp->f_bfree - tquad;
216 sbp->f_bavail = tquad;
217 /* Handle older NFS servers returning negative values */
218 if ((quad_t)sbp->f_bavail < 0)
219 sbp->f_bavail = 0;
220 tquad = fxdr_hyper(&sfp->sf_tfiles);
221 sbp->f_files = tquad;
222 tquad = fxdr_hyper(&sfp->sf_ffiles);
223 sbp->f_ffree = tquad;
224 sbp->f_favail = tquad;
225 sbp->f_fresvd = 0;
226 } else {
227 sbp->f_bsize = NFS_FABLKSIZE;
228 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
229 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
230 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
231 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
232 sbp->f_fresvd = 0;
233 sbp->f_files = 0;
234 sbp->f_ffree = 0;
235 sbp->f_favail = 0;
236 sbp->f_fresvd = 0;
237 }
238 copy_statvfs_info(sbp, mp);
239 nfsm_reqdone;
240 kauth_cred_free(cred);
241 return (error);
242 }
243
244 #ifndef NFS_V2_ONLY
245 /*
246 * nfs version 3 fsinfo rpc call
247 */
248 int
nfs_fsinfo(struct nfsmount * nmp,struct vnode * vp,kauth_cred_t cred,struct lwp * l)249 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l)
250 {
251 struct nfsv3_fsinfo *fsp;
252 char *cp;
253 int32_t t1, t2;
254 u_int32_t *tl, pref, xmax;
255 char *bpos, *dpos, *cp2;
256 int error = 0, retattr;
257 struct mbuf *mreq, *mrep, *md, *mb;
258 u_int64_t maxfsize;
259 struct nfsnode *np = VTONFS(vp);
260
261 nfsstats.rpccnt[NFSPROC_FSINFO]++;
262 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1));
263 nfsm_fhtom(np, 1);
264 nfsm_request(np, NFSPROC_FSINFO, l, cred);
265 nfsm_postop_attr(vp, retattr, 0);
266 if (!error) {
267 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
268 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
269 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 &&
270 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
271 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
272 ~(NFS_FABLKSIZE - 1);
273 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
274 if (xmax < nmp->nm_wsize && xmax > 0) {
275 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1);
276 if (nmp->nm_wsize == 0)
277 nmp->nm_wsize = xmax;
278 }
279 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
280 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 &&
281 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
282 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
283 ~(NFS_FABLKSIZE - 1);
284 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
285 if (xmax < nmp->nm_rsize && xmax > 0) {
286 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1);
287 if (nmp->nm_rsize == 0)
288 nmp->nm_rsize = xmax;
289 }
290 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
291 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ)
292 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) &
293 ~(NFS_DIRFRAGSIZ - 1);
294 if (xmax < nmp->nm_readdirsize && xmax > 0) {
295 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1);
296 if (nmp->nm_readdirsize == 0)
297 nmp->nm_readdirsize = xmax;
298 }
299 nmp->nm_maxfilesize = 0xffffffffffffffffull;
300 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
301 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
302 nmp->nm_maxfilesize = maxfsize;
303 nmp->nm_mountp->mnt_fs_bshift =
304 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
305 nmp->nm_iflag |= NFSMNT_GOTFSINFO;
306 }
307 nfsm_reqdone;
308 return (error);
309 }
310 #endif
311
312 /*
313 * Mount a remote root fs via. NFS. It goes like this:
314 * - Call nfs_boot_init() to fill in the nfs_diskless struct
315 * - build the rootfs mount point and call mountnfs() to do the rest.
316 */
317 int
nfs_mountroot(void)318 nfs_mountroot(void)
319 {
320 struct timespec ts;
321 struct nfs_diskless *nd;
322 struct vattr attr;
323 struct mount *mp;
324 struct vnode *vp;
325 struct lwp *l;
326 time_t n;
327 int error;
328
329 l = curlwp; /* XXX */
330
331 if (device_class(root_device) != DV_IFNET)
332 return (ENODEV);
333
334 /*
335 * XXX time must be non-zero when we init the interface or else
336 * the arp code will wedge. [Fixed now in if_ether.c]
337 * However, the NFS attribute cache gives false "hits" when the
338 * current time < nfs_attrtimeo(nmp, np) so keep this in for now.
339 */
340 if (time_second < NFS_MAXATTRTIMO) {
341 ts.tv_sec = NFS_MAXATTRTIMO;
342 ts.tv_nsec = 0;
343 tc_setclock(&ts);
344 }
345
346 /*
347 * Call nfs_boot_init() to fill in the nfs_diskless struct.
348 * Side effect: Finds and configures a network interface.
349 */
350 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP);
351 error = nfs_boot_init(nd, l);
352 if (error) {
353 kmem_free(nd, sizeof(*nd));
354 return (error);
355 }
356
357 /*
358 * Create the root mount point.
359 */
360 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l);
361 if (error)
362 goto out;
363 printf("root on %s\n", nd->nd_root.ndm_host);
364
365 /*
366 * Link it into the mount list.
367 */
368 mountlist_append(mp);
369 rootvp = vp;
370 mp->mnt_vnodecovered = NULLVP;
371 vfs_unbusy(mp);
372
373 /* Get root attributes (for the time). */
374 vn_lock(vp, LK_SHARED | LK_RETRY);
375 error = VOP_GETATTR(vp, &attr, l->l_cred);
376 VOP_UNLOCK(vp);
377 if (error)
378 panic("nfs_mountroot: getattr for root");
379 n = attr.va_atime.tv_sec;
380 #ifdef DEBUG
381 printf("root time: 0x%jx\n", (intmax_t)n);
382 #endif
383 setrootfstime(n);
384
385 out:
386 if (error)
387 nfs_boot_cleanup(nd, l);
388 kmem_free(nd, sizeof(*nd));
389 return (error);
390 }
391
392 /*
393 * Internal version of mount system call for diskless setup.
394 * Separate function because we used to call it twice.
395 * (once for root and once for swap)
396 */
397 static int
nfs_mount_diskless(struct nfs_dlmount * ndmntp,const char * mntname,struct mount ** mpp,struct vnode ** vpp,struct lwp * l)398 nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l)
399 /* mntname: mount point name */
400 {
401 struct mount *mp;
402 struct mbuf *m;
403 int error;
404
405 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp);
406
407 mp->mnt_op = &nfs_vfsops;
408
409 /*
410 * Historical practice expects NFS root file systems to
411 * be initially mounted r/w.
412 */
413 mp->mnt_flag &= ~MNT_RDONLY;
414
415 /* Get mbuf for server sockaddr. */
416 m = m_get(M_WAIT, MT_SONAME);
417 if (m == NULL)
418 panic("nfs_mountroot: mget soname for %s", mntname);
419 MCLAIM(m, &nfs_mowner);
420 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr,
421 (m->m_len = ndmntp->ndm_args.addr->sa_len));
422
423 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname,
424 ndmntp->ndm_args.hostname, vpp, l);
425 if (error) {
426 vfs_unbusy(mp);
427 vfs_rele(mp);
428 printf("nfs_mountroot: mount %s failed: %d\n",
429 mntname, error);
430 } else
431 *mpp = mp;
432
433 return (error);
434 }
435
436 void
nfs_decode_args(struct nfsmount * nmp,struct nfs_args * argp,struct lwp * l)437 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l)
438 {
439 int s;
440 int adjsock;
441 int maxio;
442
443 s = splsoftnet();
444
445 /*
446 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
447 * no sense in that context.
448 */
449 if (argp->sotype == SOCK_STREAM)
450 argp->flags &= ~NFSMNT_NOCONN;
451
452 /*
453 * Cookie translation is not needed for v2, silently ignore it.
454 */
455 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) ==
456 NFSMNT_XLATECOOKIE)
457 argp->flags &= ~NFSMNT_XLATECOOKIE;
458
459 /* Re-bind if rsrvd port requested and wasn't on one */
460 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
461 && (argp->flags & NFSMNT_RESVPORT);
462 /* Also re-bind if we're switching to/from a connected UDP socket */
463 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
464 (argp->flags & NFSMNT_NOCONN));
465
466 /* Update flags. */
467 nmp->nm_flag = argp->flags;
468 splx(s);
469
470 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
471 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
472 if (nmp->nm_timeo < NFS_MINTIMEO)
473 nmp->nm_timeo = NFS_MINTIMEO;
474 else if (nmp->nm_timeo > NFS_MAXTIMEO)
475 nmp->nm_timeo = NFS_MAXTIMEO;
476 }
477
478 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
479 nmp->nm_retry = argp->retrans;
480 if (nmp->nm_retry > NFS_MAXREXMIT)
481 nmp->nm_retry = NFS_MAXREXMIT;
482 }
483
484 #ifndef NFS_V2_ONLY
485 if (argp->flags & NFSMNT_NFSV3) {
486 if (argp->sotype == SOCK_DGRAM)
487 maxio = NFS_MAXDGRAMDATA;
488 else
489 maxio = NFS_MAXDATA;
490 } else
491 #endif
492 maxio = NFS_V2MAXDATA;
493
494 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
495 int osize = nmp->nm_wsize;
496 nmp->nm_wsize = argp->wsize;
497 /* Round down to multiple of blocksize */
498 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
499 if (nmp->nm_wsize <= 0)
500 nmp->nm_wsize = NFS_FABLKSIZE;
501 adjsock |= (nmp->nm_wsize != osize);
502 }
503 if (nmp->nm_wsize > maxio)
504 nmp->nm_wsize = maxio;
505 if (nmp->nm_wsize > MAXBSIZE)
506 nmp->nm_wsize = MAXBSIZE;
507
508 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
509 int osize = nmp->nm_rsize;
510 nmp->nm_rsize = argp->rsize;
511 /* Round down to multiple of blocksize */
512 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
513 if (nmp->nm_rsize <= 0)
514 nmp->nm_rsize = NFS_FABLKSIZE;
515 adjsock |= (nmp->nm_rsize != osize);
516 }
517 if (nmp->nm_rsize > maxio)
518 nmp->nm_rsize = maxio;
519 if (nmp->nm_rsize > MAXBSIZE)
520 nmp->nm_rsize = MAXBSIZE;
521
522 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
523 nmp->nm_readdirsize = argp->readdirsize;
524 /* Round down to multiple of minimum blocksize */
525 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1);
526 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ)
527 nmp->nm_readdirsize = NFS_DIRFRAGSIZ;
528 /* Bigger than buffer size makes no sense */
529 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ)
530 nmp->nm_readdirsize = NFS_DIRBLKSIZ;
531 } else if (argp->flags & NFSMNT_RSIZE)
532 nmp->nm_readdirsize = nmp->nm_rsize;
533
534 if (nmp->nm_readdirsize > maxio)
535 nmp->nm_readdirsize = maxio;
536
537 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
538 argp->maxgrouplist <= NFS_MAXGRPS)
539 nmp->nm_numgrps = argp->maxgrouplist;
540 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
541 argp->readahead <= NFS_MAXRAHEAD)
542 nmp->nm_readahead = argp->readahead;
543 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
544 argp->deadthresh <= NFS_NEVERDEAD)
545 nmp->nm_deadthresh = argp->deadthresh;
546
547 adjsock |= ((nmp->nm_sotype != argp->sotype) ||
548 (nmp->nm_soproto != argp->proto));
549 nmp->nm_sotype = argp->sotype;
550 nmp->nm_soproto = argp->proto;
551
552 if (nmp->nm_so && adjsock) {
553 nfs_safedisconnect(nmp);
554 if (nmp->nm_sotype == SOCK_DGRAM)
555 while (nfs_connect(nmp, (struct nfsreq *)0, l)) {
556 printf("nfs_args: retrying connect\n");
557 kpause("nfscn3", false, hz, NULL);
558 }
559 }
560 }
561
562 /*
563 * VFS Operations.
564 *
565 * mount system call
566 * It seems a bit dumb to copyinstr() the host and path here and then
567 * memcpy() them in mountnfs(), but I wanted to detect errors before
568 * doing the sockargs() call because sockargs() allocates an mbuf and
569 * an error after that means that I have to release the mbuf.
570 */
571 /* ARGSUSED */
572 int
nfs_mount(struct mount * mp,const char * path,void * data,size_t * data_len)573 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
574 {
575 struct lwp *l = curlwp;
576 int error;
577 struct nfs_args *args = data;
578 struct mbuf *nam;
579 struct nfsmount *nmp = VFSTONFS(mp);
580 struct sockaddr *sa;
581 struct vnode *vp;
582 char *pth, *hst;
583 size_t len;
584 u_char *nfh;
585
586 if (args == NULL)
587 return EINVAL;
588 if (*data_len < sizeof *args)
589 return EINVAL;
590
591 if (mp->mnt_flag & MNT_GETARGS) {
592
593 if (nmp == NULL)
594 return (EIO);
595 if (args->addr != NULL) {
596 sa = mtod(nmp->nm_nam, struct sockaddr *);
597 error = copyout(sa, args->addr, sa->sa_len);
598 if (error)
599 return (error);
600 args->addrlen = sa->sa_len;
601 } else
602 args->addrlen = 0;
603
604 args->version = NFS_ARGSVERSION;
605 args->sotype = nmp->nm_sotype;
606 args->proto = nmp->nm_soproto;
607 args->fh = NULL;
608 args->fhsize = 0;
609 args->flags = nmp->nm_flag;
610 args->wsize = nmp->nm_wsize;
611 args->rsize = nmp->nm_rsize;
612 args->readdirsize = nmp->nm_readdirsize;
613 args->timeo = nmp->nm_timeo;
614 args->retrans = nmp->nm_retry;
615 args->maxgrouplist = nmp->nm_numgrps;
616 args->readahead = nmp->nm_readahead;
617 args->leaseterm = 0; /* dummy */
618 args->deadthresh = nmp->nm_deadthresh;
619 args->hostname = NULL;
620 *data_len = sizeof *args;
621 return 0;
622 }
623
624 if (args->version != NFS_ARGSVERSION)
625 return (EPROGMISMATCH);
626 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB))
627 return (EPROGUNAVAIL);
628 #ifdef NFS_V2_ONLY
629 if (args->flags & NFSMNT_NFSV3)
630 return (EPROGMISMATCH);
631 #endif
632 if (mp->mnt_flag & MNT_UPDATE) {
633 if (nmp == NULL)
634 return (EIO);
635 /*
636 * When doing an update, we can't change from or to
637 * v3, or change cookie translation
638 */
639 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) |
640 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE));
641 nfs_decode_args(nmp, args, l);
642 return (0);
643 }
644 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX)
645 return (EINVAL);
646 nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK);
647 error = copyin(args->fh, nfh, args->fhsize);
648 if (error)
649 goto free_nfh;
650 pth = malloc(MNAMELEN, M_TEMP, M_WAITOK);
651 error = copyinstr(path, pth, MNAMELEN - 1, &len);
652 if (error)
653 goto free_pth;
654 memset(&pth[len], 0, MNAMELEN - len);
655 hst = malloc(MNAMELEN, M_TEMP, M_WAITOK);
656 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len);
657 if (error)
658 goto free_hst;
659 memset(&hst[len], 0, MNAMELEN - len);
660 /* sockargs() call must be after above copyin() calls */
661 error = sockargs(&nam, args->addr, args->addrlen, UIO_USERSPACE,
662 MT_SONAME);
663 if (error)
664 goto free_hst;
665 MCLAIM(nam, &nfs_mowner);
666 args->fh = nfh;
667 error = mountnfs(args, mp, nam, pth, hst, &vp, l);
668
669 free_hst:
670 free(hst, M_TEMP);
671 free_pth:
672 free(pth, M_TEMP);
673 free_nfh:
674 free(nfh, M_TEMP);
675
676 return (error);
677 }
678
679 /*
680 * Common code for mount and mountroot
681 */
682 int
mountnfs(struct nfs_args * argp,struct mount * mp,struct mbuf * nam,const char * pth,const char * hst,struct vnode ** vpp,struct lwp * l)683 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l)
684 {
685 struct nfsmount *nmp;
686 struct nfsnode *np;
687 struct vnode *vp;
688 int error;
689 struct vattr *attrs;
690 kauth_cred_t cr;
691 char iosname[IOSTATNAMELEN];
692
693 /*
694 * If the number of nfs iothreads to use has never
695 * been set, create a reasonable number of them.
696 */
697
698 if (nfs_niothreads < 0) {
699 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS);
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 }
708 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP);
709 TAILQ_INIT(&nmp->nm_uidlruhead);
710 TAILQ_INIT(&nmp->nm_bufq);
711 rw_init(&nmp->nm_writeverflock);
712 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE);
713 cv_init(&nmp->nm_rcvcv, "nfsrcv");
714 cv_init(&nmp->nm_sndcv, "nfssnd");
715 cv_init(&nmp->nm_aiocv, "nfsaio");
716 cv_init(&nmp->nm_disconcv, "nfsdis");
717
718 mp->mnt_data = nmp;
719 mp->mnt_stat.f_namemax = NFS_MAXNAMLEN;
720 vfs_getnewfsid(mp);
721 nmp->nm_mountp = mp;
722
723 #ifndef NFS_V2_ONLY
724 if ((argp->flags & NFSMNT_NFSV3) == 0)
725 #endif
726 {
727 if (argp->fhsize != NFSX_V2FH) {
728 return EINVAL;
729 }
730 }
731
732 /*
733 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
734 * will overwrite this.
735 */
736 nmp->nm_maxfilesize = 0xffffffffLL;
737
738 nmp->nm_timeo = NFS_TIMEO;
739 nmp->nm_retry = NFS_RETRANS;
740 nmp->nm_wsize = NFS_WSIZE;
741 nmp->nm_rsize = NFS_RSIZE;
742 nmp->nm_readdirsize = NFS_READDIRSIZE;
743 nmp->nm_numgrps = NFS_MAXGRPS;
744 nmp->nm_readahead = NFS_DEFRAHEAD;
745 nmp->nm_deadthresh = NFS_DEFDEADTHRESH;
746 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE,
747 mp->mnt_op->vfs_name, mp, l);
748 if (error)
749 goto bad;
750 nmp->nm_nam = nam;
751
752 /* Set up the sockets and per-host congestion */
753 nmp->nm_sotype = argp->sotype;
754 nmp->nm_soproto = argp->proto;
755
756 nfs_decode_args(nmp, argp, l);
757
758 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
759 mp->mnt_dev_bshift = DEV_BSHIFT;
760
761 /*
762 * For Connection based sockets (TCP,...) defer the connect until
763 * the first request, in case the server is not responding.
764 */
765 if (nmp->nm_sotype == SOCK_DGRAM &&
766 (error = nfs_connect(nmp, (struct nfsreq *)0, l)))
767 goto bad;
768
769 /*
770 * This is silly, but it has to be set so that vinifod() works.
771 * We do not want to do an nfs_statvfs() here since we can get
772 * stuck on a dead server and we are holding a lock on the mount
773 * point.
774 */
775 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA;
776 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np);
777 if (error)
778 goto bad;
779 vp = NFSTOV(np);
780 attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK);
781 VOP_GETATTR(vp, attrs, l->l_cred);
782 if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) {
783 cr = kauth_cred_alloc();
784 kauth_cred_setuid(cr, attrs->va_uid);
785 kauth_cred_seteuid(cr, attrs->va_uid);
786 kauth_cred_setsvuid(cr, attrs->va_uid);
787 kauth_cred_setgid(cr, attrs->va_gid);
788 kauth_cred_setegid(cr, attrs->va_gid);
789 kauth_cred_setsvgid(cr, attrs->va_gid);
790 nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr);
791 kauth_cred_free(cr);
792 }
793 free(attrs, M_TEMP);
794
795 /*
796 * A reference count is needed on the nfsnode representing the
797 * remote root. If this object is not persistent, then backward
798 * traversals of the mount point (i.e. "..") will not work if
799 * the nfsnode gets flushed out of the cache. Ufs does not have
800 * this problem, because one can identify root inodes by their
801 * number == UFS_ROOTINO (2). So, just unlock, but no rele.
802 */
803
804 nmp->nm_vnode = vp;
805 if (vp->v_type == VNON)
806 vp->v_type = VDIR;
807 vp->v_vflag |= VV_ROOT;
808 VOP_UNLOCK(vp);
809 *vpp = vp;
810
811 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++);
812 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname);
813
814 return (0);
815 bad:
816 nfs_disconnect(nmp);
817 rw_destroy(&nmp->nm_writeverflock);
818 mutex_destroy(&nmp->nm_lock);
819 cv_destroy(&nmp->nm_rcvcv);
820 cv_destroy(&nmp->nm_sndcv);
821 cv_destroy(&nmp->nm_aiocv);
822 cv_destroy(&nmp->nm_disconcv);
823 kmem_free(nmp, sizeof(*nmp));
824 m_freem(nam);
825 return (error);
826 }
827
828 /*
829 * unmount system call
830 */
831 int
nfs_unmount(struct mount * mp,int mntflags)832 nfs_unmount(struct mount *mp, int mntflags)
833 {
834 struct nfsmount *nmp = VFSTONFS(mp);
835 struct vnode *vp;
836 int error, flags = 0;
837
838 if (mntflags & MNT_FORCE) {
839 mutex_enter(&nmp->nm_lock);
840 flags |= FORCECLOSE;
841 nmp->nm_iflag |= NFSMNT_DISMNTFORCE;
842 mutex_exit(&nmp->nm_lock);
843
844 }
845
846 /*
847 * Goes something like this..
848 * - Check for activity on the root vnode (other than ourselves).
849 * - Call vflush() to clear out vnodes for this file system,
850 * except for the root vnode.
851 * - Decrement reference on the vnode representing remote root.
852 * - Close the socket
853 * - Free up the data structures
854 */
855 /*
856 * We need to decrement the ref. count on the nfsnode representing
857 * the remote root. See comment in mountnfs().
858 */
859 vp = nmp->nm_vnode;
860 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
861 if (error != 0)
862 goto err;
863
864 if ((mntflags & MNT_FORCE) == 0 && vrefcnt(vp) > 1) {
865 VOP_UNLOCK(vp);
866 error = EBUSY;
867 goto err;
868 }
869
870 error = vflush(mp, vp, flags);
871 if (error) {
872 VOP_UNLOCK(vp);
873 goto err;
874 }
875
876 /*
877 * We are now committed to the unmount; mark the mount structure
878 * as doomed so that any sleepers kicked awake by nfs_disconnect
879 * will go away cleanly.
880 */
881 nmp->nm_iflag |= NFSMNT_DISMNT;
882
883 /*
884 * No new async I/O will be added, but await for pending
885 * ones to drain.
886 */
887 while (nfs_iodbusy(nmp))
888 kpause("nfsumnt", false, hz, NULL);
889
890 /*
891 * Clean up the stats... note that we carefully avoid decrementing
892 * nfs_mount_count here for good reason - we may not be unmounting
893 * the last thing mounted.
894 */
895 iostat_free(nmp->nm_stats);
896
897 /*
898 * There is one reference count to get rid of here
899 * (see comment in mountnfs()).
900 */
901 VOP_UNLOCK(vp);
902 vgone(vp);
903 nfs_disconnect(nmp);
904 m_freem(nmp->nm_nam);
905
906 rw_destroy(&nmp->nm_writeverflock);
907 mutex_destroy(&nmp->nm_lock);
908 cv_destroy(&nmp->nm_rcvcv);
909 cv_destroy(&nmp->nm_sndcv);
910 cv_destroy(&nmp->nm_aiocv);
911 cv_destroy(&nmp->nm_disconcv);
912 kmem_free(nmp, sizeof(*nmp));
913 return (0);
914
915 err:
916 if (mntflags & MNT_FORCE) {
917 mutex_enter(&nmp->nm_lock);
918 nmp->nm_iflag &= ~NFSMNT_DISMNTFORCE;
919 mutex_exit(&nmp->nm_lock);
920 }
921
922 return error;
923 }
924
925 /*
926 * Return root of a filesystem
927 */
928 int
nfs_root(struct mount * mp,int lktype,struct vnode ** vpp)929 nfs_root(struct mount *mp, int lktype, struct vnode **vpp)
930 {
931 struct vnode *vp;
932 struct nfsmount *nmp;
933 int error;
934
935 nmp = VFSTONFS(mp);
936 vp = nmp->nm_vnode;
937 vref(vp);
938 error = vn_lock(vp, lktype | LK_RETRY);
939 if (error != 0) {
940 vrele(vp);
941 return error;
942 }
943 *vpp = vp;
944 return (0);
945 }
946
947 extern int syncprt;
948
949 static bool
nfs_sync_selector(void * cl,struct vnode * vp)950 nfs_sync_selector(void *cl, struct vnode *vp)
951 {
952
953 KASSERT(mutex_owned(vp->v_interlock));
954
955 return !LIST_EMPTY(&vp->v_dirtyblkhd) ||
956 (vp->v_iflag & VI_ONWORKLST) != 0;
957 }
958
959 /*
960 * Flush out the buffer cache
961 */
962 /* ARGSUSED */
963 int
nfs_sync(struct mount * mp,int waitfor,kauth_cred_t cred)964 nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
965 {
966 struct vnode *vp;
967 struct vnode_iterator *marker;
968 int error, allerror = 0;
969
970 /*
971 * Force stale buffer cache information to be flushed.
972 */
973 vfs_vnode_iterator_init(mp, &marker);
974 while ((vp = vfs_vnode_iterator_next(marker, nfs_sync_selector,
975 NULL)))
976 {
977 error = vn_lock(vp, LK_EXCLUSIVE);
978 if (error) {
979 vrele(vp);
980 continue;
981 }
982 error = VOP_FSYNC(vp, cred,
983 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
984 if (error)
985 allerror = error;
986 vput(vp);
987 }
988 vfs_vnode_iterator_destroy(marker);
989 return allerror;
990 }
991
992 /*
993 * NFS flat namespace lookup.
994 * Currently unsupported.
995 */
996 /* ARGSUSED */
997 int
nfs_vget(struct mount * mp,ino_t ino,int lktype,struct vnode ** vpp)998 nfs_vget(struct mount *mp, ino_t ino, int lktype, struct vnode **vpp)
999 {
1000
1001 return (EOPNOTSUPP);
1002 }
1003
1004 /*
1005 * Do that sysctl thang...
1006 */
1007 static int
sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS)1008 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS)
1009 {
1010 struct sysctlnode node;
1011 int val;
1012 int error;
1013
1014 val = nfs_niothreads;
1015 node = *rnode;
1016 node.sysctl_data = &val;
1017 error = sysctl_lookup(SYSCTLFN_CALL(&node));
1018 if (error || newp == NULL)
1019 return error;
1020
1021 return nfs_set_niothreads(val);
1022 }
1023
1024 SYSCTL_SETUP(nfs_sysctl_init, "nfs sysctl")
1025 {
1026
1027 sysctl_createv(clog, 0, NULL, NULL,
1028 CTLFLAG_PERMANENT,
1029 CTLTYPE_NODE, "nfs",
1030 SYSCTL_DESCR("NFS vfs options"),
1031 NULL, 0, NULL, 0,
1032 CTL_VFS, 2, CTL_EOL);
1033 /*
1034 * XXX the "2" above could be dynamic, thereby eliminating one
1035 * more instance of the "number to vfs" mapping problem, but
1036 * "2" is the order as taken from sys/mount.h
1037 */
1038
1039 sysctl_createv(clog, 0, NULL, NULL,
1040 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1041 CTLTYPE_STRUCT, "nfsstats",
1042 SYSCTL_DESCR("NFS operation statistics"),
1043 NULL, 0, &nfsstats, sizeof(nfsstats),
1044 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL);
1045 sysctl_createv(clog, 0, NULL, NULL,
1046 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1047 CTLTYPE_INT, "iothreads",
1048 SYSCTL_DESCR("Number of NFS client processes desired"),
1049 sysctl_vfs_nfs_iothreads, 0, NULL, 0,
1050 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL);
1051 }
1052
1053 /* ARGSUSED */
1054 int
nfs_fhtovp(struct mount * mp,struct fid * fid,int lktype,struct vnode ** vpp)1055 nfs_fhtovp(struct mount *mp, struct fid *fid, int lktype, struct vnode **vpp)
1056 {
1057 size_t fidsize;
1058 size_t fhsize;
1059 struct nfsnode *np;
1060 int error;
1061 struct vattr va;
1062
1063 fidsize = fid->fid_len;
1064 if (fidsize < sizeof(*fid)) {
1065 return EINVAL;
1066 }
1067 fhsize = fidsize - sizeof(*fid);
1068 if ((fhsize % NFSX_UNSIGNED) != 0) {
1069 return EINVAL;
1070 }
1071 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) {
1072 if (fhsize > NFSX_V3FHMAX || fhsize == 0) {
1073 return EINVAL;
1074 }
1075 } else {
1076 if (fhsize != NFSX_V2FH) {
1077 return EINVAL;
1078 }
1079 }
1080 /* XXX lktype ignored */
1081 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np);
1082 if (error) {
1083 return error;
1084 }
1085 *vpp = NFSTOV(np);
1086 error = VOP_GETATTR(*vpp, &va, kauth_cred_get());
1087 if (error != 0) {
1088 vput(*vpp);
1089 *vpp = NULLVP;
1090 }
1091 return error;
1092 }
1093
1094 /* ARGSUSED */
1095 int
nfs_vptofh(struct vnode * vp,struct fid * buf,size_t * bufsize)1096 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize)
1097 {
1098 struct nfsnode *np;
1099 struct fid *fid;
1100 size_t fidsize;
1101 int error = 0;
1102
1103 np = VTONFS(vp);
1104 fidsize = sizeof(*fid) + np->n_fhsize;
1105 if (*bufsize < fidsize) {
1106 error = E2BIG;
1107 }
1108 *bufsize = fidsize;
1109 if (error == 0) {
1110 struct fid fid_store;
1111
1112 fid = &fid_store;
1113 memset(fid, 0, sizeof(*fid));
1114 fid->fid_len = fidsize;
1115 memcpy(buf, fid, sizeof(*fid));
1116 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize);
1117 }
1118 return error;
1119 }
1120
1121 /*
1122 * Vfs start routine, a no-op.
1123 */
1124 /* ARGSUSED */
1125 int
nfs_start(struct mount * mp,int flags)1126 nfs_start(struct mount *mp, int flags)
1127 {
1128
1129 return (0);
1130 }
1131
1132 /*
1133 * Called once at VFS init to initialize client-specific data structures.
1134 */
1135 void
nfs_vfs_init(void)1136 nfs_vfs_init(void)
1137 {
1138 unsigned scale;
1139
1140 /* Initialize NFS server / client shared data. */
1141 nfs_init();
1142 nfs_node_init();
1143
1144 /* Initialize the kqueue structures */
1145 nfs_kqinit();
1146 /* Initialize the iod structures */
1147 nfs_iodinit();
1148
1149 scale = PAGE_SHIFT - 4;
1150 nfs_commitsize = uimin(uvmexp.npages, INT_MAX >> scale) << scale;
1151 }
1152
1153 void
nfs_vfs_done(void)1154 nfs_vfs_done(void)
1155 {
1156
1157 nfs_node_done();
1158 nfs_kqfini();
1159 nfs_iodfini();
1160 nfs_fini();
1161 }
1162