1 /*-
2 * Copyright (c) 1989, 1991, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: releng/8.3/sys/nfsclient/nfs_krpc.c 229906 2012-01-10 02:55:43Z rmacklem $");
37
38 /*
39 * Socket operations for use by nfs
40 */
41
42 #include "opt_inet6.h"
43 #include "opt_kdtrace.h"
44 #include "opt_kgssapi.h"
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/limits.h>
50 #include <sys/lock.h>
51 #include <sys/malloc.h>
52 #include <sys/mbuf.h>
53 #include <sys/mount.h>
54 #include <sys/mutex.h>
55 #include <sys/proc.h>
56 #include <sys/signalvar.h>
57 #include <sys/syscallsubr.h>
58 #include <sys/sysctl.h>
59 #include <sys/syslog.h>
60 #include <sys/vnode.h>
61
62 #include <rpc/rpc.h>
63
64 #include <nfs/nfsproto.h>
65 #include <nfsclient/nfs.h>
66 #include <nfs/xdr_subs.h>
67 #include <nfsclient/nfsm_subs.h>
68 #include <nfsclient/nfsmount.h>
69 #include <nfsclient/nfsnode.h>
70
71 #ifdef KDTRACE_HOOKS
72 #include <sys/dtrace_bsd.h>
73
74 dtrace_nfsclient_nfs23_start_probe_func_t
75 dtrace_nfsclient_nfs23_start_probe;
76
77 dtrace_nfsclient_nfs23_done_probe_func_t
78 dtrace_nfsclient_nfs23_done_probe;
79
80 /*
81 * Registered probes by RPC type.
82 */
83 uint32_t nfsclient_nfs2_start_probes[NFS_NPROCS];
84 uint32_t nfsclient_nfs2_done_probes[NFS_NPROCS];
85
86 uint32_t nfsclient_nfs3_start_probes[NFS_NPROCS];
87 uint32_t nfsclient_nfs3_done_probes[NFS_NPROCS];
88 #endif
89
90 static int nfs_bufpackets = 4;
91 static int nfs_reconnects;
92 static int nfs3_jukebox_delay = 10;
93 static int nfs_skip_wcc_data_onerr = 1;
94 static int fake_wchan;
95
96 SYSCTL_DECL(_vfs_nfs);
97
98 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0,
99 "Buffer reservation size 2 < x < 64");
100 SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0,
101 "Number of times the nfs client has had to reconnect");
102 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs3_jukebox_delay, CTLFLAG_RW,
103 &nfs3_jukebox_delay, 0,
104 "Number of seconds to delay a retry after receiving EJUKEBOX");
105 SYSCTL_INT(_vfs_nfs, OID_AUTO, skip_wcc_data_onerr, CTLFLAG_RW,
106 &nfs_skip_wcc_data_onerr, 0,
107 "Disable weak cache consistency checking when server returns an error");
108
109 static void nfs_down(struct nfsmount *, struct thread *, const char *,
110 int, int);
111 static void nfs_up(struct nfsmount *, struct thread *, const char *,
112 int, int);
113 static int nfs_msg(struct thread *, const char *, const char *, int);
114
115 extern int nfsv2_procid[];
116
117 struct nfs_cached_auth {
118 int ca_refs; /* refcount, including 1 from the cache */
119 uid_t ca_uid; /* uid that corresponds to this auth */
120 AUTH *ca_auth; /* RPC auth handle */
121 };
122
123 /*
124 * RTT estimator
125 */
126
127 static enum nfs_rto_timer_t nfs_proct[NFS_NPROCS] = {
128 NFS_DEFAULT_TIMER, /* NULL */
129 NFS_GETATTR_TIMER, /* GETATTR */
130 NFS_DEFAULT_TIMER, /* SETATTR */
131 NFS_LOOKUP_TIMER, /* LOOKUP */
132 NFS_GETATTR_TIMER, /* ACCESS */
133 NFS_READ_TIMER, /* READLINK */
134 NFS_READ_TIMER, /* READ */
135 NFS_WRITE_TIMER, /* WRITE */
136 NFS_DEFAULT_TIMER, /* CREATE */
137 NFS_DEFAULT_TIMER, /* MKDIR */
138 NFS_DEFAULT_TIMER, /* SYMLINK */
139 NFS_DEFAULT_TIMER, /* MKNOD */
140 NFS_DEFAULT_TIMER, /* REMOVE */
141 NFS_DEFAULT_TIMER, /* RMDIR */
142 NFS_DEFAULT_TIMER, /* RENAME */
143 NFS_DEFAULT_TIMER, /* LINK */
144 NFS_READ_TIMER, /* READDIR */
145 NFS_READ_TIMER, /* READDIRPLUS */
146 NFS_DEFAULT_TIMER, /* FSSTAT */
147 NFS_DEFAULT_TIMER, /* FSINFO */
148 NFS_DEFAULT_TIMER, /* PATHCONF */
149 NFS_DEFAULT_TIMER, /* COMMIT */
150 NFS_DEFAULT_TIMER, /* NOOP */
151 };
152
153 /*
154 * Choose the correct RTT timer for this NFS procedure.
155 */
156 static inline enum nfs_rto_timer_t
157 nfs_rto_timer(u_int32_t procnum)
158 {
159
160 return (nfs_proct[procnum]);
161 }
162
163 /*
164 * Initialize the RTT estimator state for a new mount point.
165 */
166 static void
167 nfs_init_rtt(struct nfsmount *nmp)
168 {
169 int i;
170
171 for (i = 0; i < NFS_MAX_TIMER; i++) {
172 nmp->nm_timers[i].rt_srtt = hz;
173 nmp->nm_timers[i].rt_deviate = 0;
174 nmp->nm_timers[i].rt_rtxcur = hz;
175 }
176 }
177
178 /*
179 * Initialize sockets and congestion for a new NFS connection.
180 * We do not free the sockaddr if error.
181 */
182 int
183 nfs_connect(struct nfsmount *nmp)
184 {
185 int rcvreserve, sndreserve;
186 int pktscale;
187 struct sockaddr *saddr;
188 struct ucred *origcred;
189 struct thread *td = curthread;
190 CLIENT *client;
191 struct netconfig *nconf;
192 rpcvers_t vers;
193 int one = 1, retries;
194 struct timeval timo;
195
196 /*
197 * We need to establish the socket using the credentials of
198 * the mountpoint. Some parts of this process (such as
199 * sobind() and soconnect()) will use the curent thread's
200 * credential instead of the socket credential. To work
201 * around this, temporarily change the current thread's
202 * credential to that of the mountpoint.
203 *
204 * XXX: It would be better to explicitly pass the correct
205 * credential to sobind() and soconnect().
206 */
207 origcred = td->td_ucred;
208 td->td_ucred = nmp->nm_mountp->mnt_cred;
209 saddr = nmp->nm_nam;
210
211 vers = NFS_VER2;
212 if (nmp->nm_flag & NFSMNT_NFSV3)
213 vers = NFS_VER3;
214 else if (nmp->nm_flag & NFSMNT_NFSV4)
215 vers = NFS_VER4;
216 if (saddr->sa_family == AF_INET)
217 if (nmp->nm_sotype == SOCK_DGRAM)
218 nconf = getnetconfigent("udp");
219 else
220 nconf = getnetconfigent("tcp");
221 else
222 if (nmp->nm_sotype == SOCK_DGRAM)
223 nconf = getnetconfigent("udp6");
224 else
225 nconf = getnetconfigent("tcp6");
226
227 /*
228 * Get buffer reservation size from sysctl, but impose reasonable
229 * limits.
230 */
231 pktscale = nfs_bufpackets;
232 if (pktscale < 2)
233 pktscale = 2;
234 if (pktscale > 64)
235 pktscale = 64;
236 mtx_lock(&nmp->nm_mtx);
237 if (nmp->nm_sotype == SOCK_DGRAM) {
238 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
239 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
240 NFS_MAXPKTHDR) * pktscale;
241 } else if (nmp->nm_sotype == SOCK_SEQPACKET) {
242 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
243 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
244 NFS_MAXPKTHDR) * pktscale;
245 } else {
246 if (nmp->nm_sotype != SOCK_STREAM)
247 panic("nfscon sotype");
248 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR +
249 sizeof (u_int32_t)) * pktscale;
250 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR +
251 sizeof (u_int32_t)) * pktscale;
252 }
253 mtx_unlock(&nmp->nm_mtx);
254
255 client = clnt_reconnect_create(nconf, saddr, NFS_PROG, vers,
256 sndreserve, rcvreserve);
257 CLNT_CONTROL(client, CLSET_WAITCHAN, "nfsreq");
258 if (nmp->nm_flag & NFSMNT_INT)
259 CLNT_CONTROL(client, CLSET_INTERRUPTIBLE, &one);
260 if (nmp->nm_flag & NFSMNT_RESVPORT)
261 CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
262 if ((nmp->nm_flag & NFSMNT_SOFT) != 0) {
263 if (nmp->nm_sotype == SOCK_DGRAM)
264 /*
265 * For UDP, the large timeout for a reconnect will
266 * be set to "nm_retry * nm_timeo / 2", so we only
267 * want to do 2 reconnect timeout retries.
268 */
269 retries = 2;
270 else
271 retries = nmp->nm_retry;
272 } else
273 retries = INT_MAX;
274 CLNT_CONTROL(client, CLSET_RETRIES, &retries);
275
276 /*
277 * For UDP, there are 2 timeouts:
278 * - CLSET_RETRY_TIMEOUT sets the initial timeout for the timer
279 * that does a retransmit of an RPC request using the same socket
280 * and xid. This is what you normally want to do, since NFS
281 * servers depend on "same xid" for their Duplicate Request Cache.
282 * - timeout specified in CLNT_CALL_MBUF(), which specifies when
283 * retransmits on the same socket should fail and a fresh socket
284 * created. Each of these timeouts counts as one CLSET_RETRIES,
285 * as set above.
286 * Set the initial retransmit timeout for UDP. This timeout doesn't
287 * exist for TCP and the following call just fails, which is ok.
288 */
289 timo.tv_sec = nmp->nm_timeo / NFS_HZ;
290 timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
291 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, &timo);
292
293 mtx_lock(&nmp->nm_mtx);
294 if (nmp->nm_client) {
295 /*
296 * Someone else already connected.
297 */
298 CLNT_RELEASE(client);
299 } else
300 nmp->nm_client = client;
301
302 /*
303 * Protocols that do not require connections may be optionally left
304 * unconnected for servers that reply from a port other than NFS_PORT.
305 */
306 if (!(nmp->nm_flag & NFSMNT_NOCONN)) {
307 mtx_unlock(&nmp->nm_mtx);
308 CLNT_CONTROL(client, CLSET_CONNECT, &one);
309 } else
310 mtx_unlock(&nmp->nm_mtx);
311
312 /* Restore current thread's credentials. */
313 td->td_ucred = origcred;
314
315 mtx_lock(&nmp->nm_mtx);
316 /* Initialize other non-zero congestion variables. */
317 nfs_init_rtt(nmp);
318 mtx_unlock(&nmp->nm_mtx);
319 return (0);
320 }
321
322 /*
323 * NFS disconnect. Clean up and unlink.
324 */
325 void
326 nfs_disconnect(struct nfsmount *nmp)
327 {
328 CLIENT *client;
329
330 mtx_lock(&nmp->nm_mtx);
331 if (nmp->nm_client) {
332 client = nmp->nm_client;
333 nmp->nm_client = NULL;
334 mtx_unlock(&nmp->nm_mtx);
335 rpc_gss_secpurge_call(client);
336 CLNT_CLOSE(client);
337 CLNT_RELEASE(client);
338 } else
339 mtx_unlock(&nmp->nm_mtx);
340 }
341
342 void
343 nfs_safedisconnect(struct nfsmount *nmp)
344 {
345
346 nfs_disconnect(nmp);
347 }
348
349 static AUTH *
350 nfs_getauth(struct nfsmount *nmp, struct ucred *cred)
351 {
352 rpc_gss_service_t svc;
353 AUTH *auth;
354
355 switch (nmp->nm_secflavor) {
356 case RPCSEC_GSS_KRB5:
357 case RPCSEC_GSS_KRB5I:
358 case RPCSEC_GSS_KRB5P:
359 if (!nmp->nm_mech_oid)
360 if (!rpc_gss_mech_to_oid_call("kerberosv5",
361 &nmp->nm_mech_oid))
362 return (NULL);
363 if (nmp->nm_secflavor == RPCSEC_GSS_KRB5)
364 svc = rpc_gss_svc_none;
365 else if (nmp->nm_secflavor == RPCSEC_GSS_KRB5I)
366 svc = rpc_gss_svc_integrity;
367 else
368 svc = rpc_gss_svc_privacy;
369 auth = rpc_gss_secfind_call(nmp->nm_client, cred,
370 nmp->nm_principal, nmp->nm_mech_oid, svc);
371 if (auth)
372 return (auth);
373 /* fallthrough */
374 case AUTH_SYS:
375 default:
376 return (authunix_create(cred));
377
378 }
379 }
380
381 /*
382 * Callback from the RPC code to generate up/down notifications.
383 */
384
385 struct nfs_feedback_arg {
386 struct nfsmount *nf_mount;
387 int nf_lastmsg; /* last tprintf */
388 int nf_tprintfmsg;
389 struct thread *nf_td;
390 };
391
392 static void
393 nfs_feedback(int type, int proc, void *arg)
394 {
395 struct nfs_feedback_arg *nf = (struct nfs_feedback_arg *) arg;
396 struct nfsmount *nmp = nf->nf_mount;
397 struct timeval now;
398
399 getmicrouptime(&now);
400
401 switch (type) {
402 case FEEDBACK_REXMIT2:
403 case FEEDBACK_RECONNECT:
404 if (nf->nf_lastmsg + nmp->nm_tprintf_delay < now.tv_sec) {
405 nfs_down(nmp, nf->nf_td,
406 "not responding", 0, NFSSTA_TIMEO);
407 nf->nf_tprintfmsg = TRUE;
408 nf->nf_lastmsg = now.tv_sec;
409 }
410 break;
411
412 case FEEDBACK_OK:
413 nfs_up(nf->nf_mount, nf->nf_td,
414 "is alive again", NFSSTA_TIMEO, nf->nf_tprintfmsg);
415 break;
416 }
417 }
418
419 /*
420 * nfs_request - goes something like this
421 * - fill in request struct
422 * - links it into list
423 * - calls nfs_send() for first transmit
424 * - calls nfs_receive() to get reply
425 * - break down rpc header and return with nfs reply pointed to
426 * by mrep or error
427 * nb: always frees up mreq mbuf list
428 */
429 int
430 nfs_request(struct vnode *vp, struct mbuf *mreq, int procnum,
431 struct thread *td, struct ucred *cred, struct mbuf **mrp,
432 struct mbuf **mdp, caddr_t *dposp)
433 {
434 struct mbuf *mrep;
435 u_int32_t *tl;
436 struct nfsmount *nmp;
437 struct mbuf *md;
438 time_t waituntil;
439 caddr_t dpos;
440 int error = 0, timeo;
441 struct timeval now;
442 AUTH *auth = NULL;
443 enum nfs_rto_timer_t timer;
444 struct nfs_feedback_arg nf;
445 struct rpc_callextra ext;
446 enum clnt_stat stat;
447 struct timeval timo;
448
449 /* Reject requests while attempting a forced unmount. */
450 if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
451 m_freem(mreq);
452 return (ESTALE);
453 }
454 nmp = VFSTONFS(vp->v_mount);
455 bzero(&nf, sizeof(struct nfs_feedback_arg));
456 nf.nf_mount = nmp;
457 nf.nf_td = td;
458 getmicrouptime(&now);
459 nf.nf_lastmsg = now.tv_sec -
460 ((nmp->nm_tprintf_delay) - (nmp->nm_tprintf_initial_delay));
461
462 /*
463 * XXX if not already connected call nfs_connect now. Longer
464 * term, change nfs_mount to call nfs_connect unconditionally
465 * and let clnt_reconnect_create handle reconnects.
466 */
467 if (!nmp->nm_client)
468 nfs_connect(nmp);
469
470 auth = nfs_getauth(nmp, cred);
471 if (!auth) {
472 m_freem(mreq);
473 return (EACCES);
474 }
475 bzero(&ext, sizeof(ext));
476 ext.rc_auth = auth;
477
478 ext.rc_feedback = nfs_feedback;
479 ext.rc_feedback_arg = &nf;
480
481 /*
482 * Use a conservative timeout for RPCs other than getattr,
483 * lookup, read or write. The justification for doing "other"
484 * this way is that these RPCs happen so infrequently that
485 * timer est. would probably be stale. Also, since many of
486 * these RPCs are non-idempotent, a conservative timeout is
487 * desired.
488 */
489 timer = nfs_rto_timer(procnum);
490 if (timer != NFS_DEFAULT_TIMER)
491 ext.rc_timers = &nmp->nm_timers[timer - 1];
492 else
493 ext.rc_timers = NULL;
494
495 #ifdef KDTRACE_HOOKS
496 if (dtrace_nfsclient_nfs23_start_probe != NULL) {
497 uint32_t probe_id;
498 int probe_procnum;
499
500 if (nmp->nm_flag & NFSMNT_NFSV3) {
501 probe_id = nfsclient_nfs3_start_probes[procnum];
502 probe_procnum = procnum;
503 } else {
504 probe_id = nfsclient_nfs2_start_probes[procnum];
505 probe_procnum = nfsv2_procid[procnum];
506 }
507 if (probe_id != 0)
508 (dtrace_nfsclient_nfs23_start_probe)(probe_id, vp,
509 mreq, cred, probe_procnum);
510 }
511 #endif
512
513 nfsstats.rpcrequests++;
514 tryagain:
515 /*
516 * This timeout specifies when a new socket should be created,
517 * along with new xid values. For UDP, this should be done
518 * infrequently, since retransmits of RPC requests should normally
519 * use the same xid.
520 */
521 if (nmp->nm_sotype == SOCK_DGRAM) {
522 if ((nmp->nm_flag & NFSMNT_SOFT) != 0) {
523 /*
524 * CLSET_RETRIES is set to 2, so this should be half
525 * of the total timeout required.
526 */
527 timeo = nmp->nm_retry * nmp->nm_timeo / 2;
528 if (timeo < 1)
529 timeo = 1;
530 timo.tv_sec = timeo / NFS_HZ;
531 timo.tv_usec = (timeo % NFS_HZ) * 1000000 / NFS_HZ;
532 } else {
533 /* For UDP hard mounts, use a large value. */
534 timo.tv_sec = NFS_MAXTIMEO / NFS_HZ;
535 timo.tv_usec = 0;
536 }
537 } else {
538 timo.tv_sec = nmp->nm_timeo / NFS_HZ;
539 timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
540 }
541 mrep = NULL;
542 stat = CLNT_CALL_MBUF(nmp->nm_client, &ext,
543 (nmp->nm_flag & NFSMNT_NFSV3) ? procnum : nfsv2_procid[procnum],
544 mreq, &mrep, timo);
545
546 /*
547 * If there was a successful reply and a tprintf msg.
548 * tprintf a response.
549 */
550 if (stat == RPC_SUCCESS)
551 error = 0;
552 else if (stat == RPC_TIMEDOUT)
553 error = ETIMEDOUT;
554 else if (stat == RPC_VERSMISMATCH)
555 error = EOPNOTSUPP;
556 else if (stat == RPC_PROGVERSMISMATCH)
557 error = EPROTONOSUPPORT;
558 else
559 error = EACCES;
560 if (error)
561 goto nfsmout;
562
563 KASSERT(mrep != NULL, ("mrep shouldn't be NULL if no error\n"));
564
565 /*
566 * Search for any mbufs that are not a multiple of 4 bytes long
567 * or with m_data not longword aligned.
568 * These could cause pointer alignment problems, so copy them to
569 * well aligned mbufs.
570 */
571 error = nfs_realign(&mrep, M_DONTWAIT);
572 if (error == ENOMEM) {
573 m_freem(mrep);
574 AUTH_DESTROY(auth);
575 return (error);
576 }
577
578 md = mrep;
579 dpos = mtod(mrep, caddr_t);
580 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
581 if (*tl != 0) {
582 error = fxdr_unsigned(int, *tl);
583 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
584 error == NFSERR_TRYLATER) {
585 m_freem(mrep);
586 error = 0;
587 waituntil = time_second + nfs3_jukebox_delay;
588 while (time_second < waituntil)
589 (void)tsleep(&fake_wchan, PSOCK, "nqnfstry",
590 hz);
591 goto tryagain;
592 }
593 /*
594 * Make sure NFSERR_RETERR isn't bogusly set by a server
595 * such as amd. (No actual NFS error has bit 31 set.)
596 */
597 error &= ~NFSERR_RETERR;
598
599 /*
600 * If the File Handle was stale, invalidate the lookup
601 * cache, just in case.
602 */
603 if (error == ESTALE)
604 nfs_purgecache(vp);
605 /*
606 * Skip wcc data on NFS errors for now. NetApp filers
607 * return corrupt postop attrs in the wcc data for NFS
608 * err EROFS. Not sure if they could return corrupt
609 * postop attrs for others errors.
610 */
611 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
612 !nfs_skip_wcc_data_onerr) {
613 *mrp = mrep;
614 *mdp = md;
615 *dposp = dpos;
616 error |= NFSERR_RETERR;
617 } else
618 m_freem(mrep);
619 goto nfsmout;
620 }
621
622 #ifdef KDTRACE_HOOKS
623 if (dtrace_nfsclient_nfs23_done_probe != NULL) {
624 uint32_t probe_id;
625 int probe_procnum;
626
627 if (nmp->nm_flag & NFSMNT_NFSV3) {
628 probe_id = nfsclient_nfs3_done_probes[procnum];
629 probe_procnum = procnum;
630 } else {
631 probe_id = nfsclient_nfs2_done_probes[procnum];
632 probe_procnum = (nmp->nm_flag & NFSMNT_NFSV3) ?
633 procnum : nfsv2_procid[procnum];
634 }
635 if (probe_id != 0)
636 (dtrace_nfsclient_nfs23_done_probe)(probe_id, vp,
637 mreq, cred, probe_procnum, 0);
638 }
639 #endif
640 m_freem(mreq);
641 *mrp = mrep;
642 *mdp = md;
643 *dposp = dpos;
644 AUTH_DESTROY(auth);
645 return (0);
646
647 nfsmout:
648 #ifdef KDTRACE_HOOKS
649 if (dtrace_nfsclient_nfs23_done_probe != NULL) {
650 uint32_t probe_id;
651 int probe_procnum;
652
653 if (nmp->nm_flag & NFSMNT_NFSV3) {
654 probe_id = nfsclient_nfs3_done_probes[procnum];
655 probe_procnum = procnum;
656 } else {
657 probe_id = nfsclient_nfs2_done_probes[procnum];
658 probe_procnum = (nmp->nm_flag & NFSMNT_NFSV3) ?
659 procnum : nfsv2_procid[procnum];
660 }
661 if (probe_id != 0)
662 (dtrace_nfsclient_nfs23_done_probe)(probe_id, vp,
663 mreq, cred, probe_procnum, error);
664 }
665 #endif
666 m_freem(mreq);
667 if (auth)
668 AUTH_DESTROY(auth);
669 return (error);
670 }
671
672 /*
673 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
674 * wait for all requests to complete. This is used by forced unmounts
675 * to terminate any outstanding RPCs.
676 */
677 int
678 nfs_nmcancelreqs(struct nfsmount *nmp)
679 {
680
681 if (nmp->nm_client)
682 CLNT_CLOSE(nmp->nm_client);
683 return (0);
684 }
685
686 /*
687 * Any signal that can interrupt an NFS operation in an intr mount
688 * should be added to this set. SIGSTOP and SIGKILL cannot be masked.
689 */
690 int nfs_sig_set[] = {
691 SIGINT,
692 SIGTERM,
693 SIGHUP,
694 SIGKILL,
695 SIGSTOP,
696 SIGQUIT
697 };
698
699 /*
700 * Check to see if one of the signals in our subset is pending on
701 * the process (in an intr mount).
702 */
703 static int
704 nfs_sig_pending(sigset_t set)
705 {
706 int i;
707
708 for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++)
709 if (SIGISMEMBER(set, nfs_sig_set[i]))
710 return (1);
711 return (0);
712 }
713
714 /*
715 * The set/restore sigmask functions are used to (temporarily) overwrite
716 * the process p_sigmask during an RPC call (for example). These are also
717 * used in other places in the NFS client that might tsleep().
718 */
719 void
720 nfs_set_sigmask(struct thread *td, sigset_t *oldset)
721 {
722 sigset_t newset;
723 int i;
724 struct proc *p;
725
726 SIGFILLSET(newset);
727 if (td == NULL)
728 td = curthread; /* XXX */
729 p = td->td_proc;
730 /* Remove the NFS set of signals from newset. */
731 PROC_LOCK(p);
732 mtx_lock(&p->p_sigacts->ps_mtx);
733 for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++) {
734 /*
735 * But make sure we leave the ones already masked
736 * by the process, i.e. remove the signal from the
737 * temporary signalmask only if it wasn't already
738 * in p_sigmask.
739 */
740 if (!SIGISMEMBER(td->td_sigmask, nfs_sig_set[i]) &&
741 !SIGISMEMBER(p->p_sigacts->ps_sigignore, nfs_sig_set[i]))
742 SIGDELSET(newset, nfs_sig_set[i]);
743 }
744 mtx_unlock(&p->p_sigacts->ps_mtx);
745 PROC_UNLOCK(p);
746 kern_sigprocmask(td, SIG_SETMASK, &newset, oldset, 0);
747 }
748
749 void
750 nfs_restore_sigmask(struct thread *td, sigset_t *set)
751 {
752 if (td == NULL)
753 td = curthread; /* XXX */
754 kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
755 }
756
757 /*
758 * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
759 * old one after msleep() returns.
760 */
761 int
762 nfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority,
763 char *wmesg, int timo)
764 {
765 sigset_t oldset;
766 int error;
767 struct proc *p;
768
769 if ((priority & PCATCH) == 0)
770 return msleep(ident, mtx, priority, wmesg, timo);
771 if (td == NULL)
772 td = curthread; /* XXX */
773 nfs_set_sigmask(td, &oldset);
774 error = msleep(ident, mtx, priority, wmesg, timo);
775 nfs_restore_sigmask(td, &oldset);
776 p = td->td_proc;
777 return (error);
778 }
779
780 /*
781 * Test for a termination condition pending on the process.
782 * This is used for NFSMNT_INT mounts.
783 */
784 int
785 nfs_sigintr(struct nfsmount *nmp, struct thread *td)
786 {
787 struct proc *p;
788 sigset_t tmpset;
789
790 /* Terminate all requests while attempting a forced unmount. */
791 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
792 return (EIO);
793 if (!(nmp->nm_flag & NFSMNT_INT))
794 return (0);
795 if (td == NULL)
796 return (0);
797 p = td->td_proc;
798 PROC_LOCK(p);
799 tmpset = p->p_siglist;
800 SIGSETOR(tmpset, td->td_siglist);
801 SIGSETNAND(tmpset, td->td_sigmask);
802 mtx_lock(&p->p_sigacts->ps_mtx);
803 SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
804 mtx_unlock(&p->p_sigacts->ps_mtx);
805 if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist))
806 && nfs_sig_pending(tmpset)) {
807 PROC_UNLOCK(p);
808 return (EINTR);
809 }
810 PROC_UNLOCK(p);
811 return (0);
812 }
813
814 static int
815 nfs_msg(struct thread *td, const char *server, const char *msg, int error)
816 {
817 struct proc *p;
818
819 p = td ? td->td_proc : NULL;
820 if (error)
821 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n", server,
822 msg, error);
823 else
824 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
825 return (0);
826 }
827
828 static void
829 nfs_down(struct nfsmount *nmp, struct thread *td, const char *msg,
830 int error, int flags)
831 {
832 if (nmp == NULL)
833 return;
834 mtx_lock(&nmp->nm_mtx);
835 if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
836 nmp->nm_state |= NFSSTA_TIMEO;
837 mtx_unlock(&nmp->nm_mtx);
838 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
839 VQ_NOTRESP, 0);
840 } else
841 mtx_unlock(&nmp->nm_mtx);
842 mtx_lock(&nmp->nm_mtx);
843 if ((flags & NFSSTA_LOCKTIMEO) &&
844 !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
845 nmp->nm_state |= NFSSTA_LOCKTIMEO;
846 mtx_unlock(&nmp->nm_mtx);
847 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
848 VQ_NOTRESPLOCK, 0);
849 } else
850 mtx_unlock(&nmp->nm_mtx);
851 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
852 }
853
854 static void
855 nfs_up(struct nfsmount *nmp, struct thread *td, const char *msg,
856 int flags, int tprintfmsg)
857 {
858 if (nmp == NULL)
859 return;
860 if (tprintfmsg)
861 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
862
863 mtx_lock(&nmp->nm_mtx);
864 if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
865 nmp->nm_state &= ~NFSSTA_TIMEO;
866 mtx_unlock(&nmp->nm_mtx);
867 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
868 VQ_NOTRESP, 1);
869 } else
870 mtx_unlock(&nmp->nm_mtx);
871
872 mtx_lock(&nmp->nm_mtx);
873 if ((flags & NFSSTA_LOCKTIMEO) &&
874 (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
875 nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
876 mtx_unlock(&nmp->nm_mtx);
877 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
878 VQ_NOTRESPLOCK, 1);
879 } else
880 mtx_unlock(&nmp->nm_mtx);
881 }
Cache object: c541636190767e45688e84b7701ef8ff
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