1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
26 /* All Rights Reserved */
27
28 /*
29 * University Copyright- Copyright (c) 1982, 1986, 1988
30 * The Regents of the University of California
31 * All Rights Reserved
32 *
33 * University Acknowledgment- Portions of this document are derived from
34 * software developed by the University of California, Berkeley, and its
35 * contributors.
36 */
37
38 /* LINTLIBRARY */
39 /* PROTOLIB1 */
40
41 /* NFS server */
42
43 #include <sys/param.h>
44 #include <sys/types.h>
45 #include <sys/stat.h>
46 #include <syslog.h>
47 #include <tiuser.h>
48 #include <rpc/rpc.h>
49 #include <errno.h>
50 #include <thread.h>
51 #include <sys/resource.h>
52 #include <sys/time.h>
53 #include <sys/file.h>
54 #include <nfs/nfs.h>
55 #include <nfs/nfs_acl.h>
56 #include <nfs/nfssys.h>
57 #include <stdio.h>
58 #include <stdio_ext.h>
59 #include <stdlib.h>
60 #include <signal.h>
61 #include <netconfig.h>
62 #include <netdir.h>
63 #include <string.h>
64 #include <unistd.h>
65 #include <limits.h>
66 #include <stropts.h>
67 #include <sys/tihdr.h>
68 #include <sys/wait.h>
69 #include <poll.h>
70 #include <priv_utils.h>
71 #include <sys/tiuser.h>
72 #include <netinet/tcp.h>
73 #include <deflt.h>
74 #include <rpcsvc/daemon_utils.h>
75 #include <rpcsvc/nfs4_prot.h>
76 #include <libnvpair.h>
77 #include <libscf.h>
78 #include <libshare.h>
79 #include "nfs_tbind.h"
80 #include "thrpool.h"
81 #include "smfcfg.h"
82
83 /* quiesce requests will be ignored if nfs_server_vers_max < QUIESCE_VERSMIN */
84 #define QUIESCE_VERSMIN 4
85 /* DSS: distributed stable storage */
86 #define DSS_VERSMIN 4
87
88 static int nfssvc(int, struct netbuf, struct netconfig *);
89 static int nfssvcpool(int maxservers);
90 static int dss_init(uint_t npaths, char **pathnames);
91 static void dss_mkleafdirs(uint_t npaths, char **pathnames);
92 static void dss_mkleafdir(char *dir, char *leaf, char *path);
93 static void usage(void);
94 int qstrcmp(const void *s1, const void *s2);
95
96 extern int _nfssys(int, void *);
97
98 extern int daemonize_init(void);
99 extern void daemonize_fini(int fd);
100
101 /* signal handlers */
102 static void sigflush(int);
103 static void quiesce(int);
104
105 static char *MyName;
106 static NETSELDECL(defaultproviders)[] = { "/dev/tcp6", "/dev/tcp", "/dev/udp",
107 "/dev/udp6", NULL };
108 /* static NETSELDECL(defaultprotos)[] = { NC_UDP, NC_TCP, NULL }; */
109 /*
110 * The following are all globals used by routines in nfs_tbind.c.
111 */
112 size_t end_listen_fds; /* used by conn_close_oldest() */
113 size_t num_fds = 0; /* used by multiple routines */
114 int listen_backlog = 32; /* used by bind_to_{provider,proto}() */
115 int num_servers; /* used by cots_listen_event() */
116 int (*Mysvc)(int, struct netbuf, struct netconfig *) = nfssvc;
117 /* used by cots_listen_event() */
118 int max_conns_allowed = -1; /* used by cots_listen_event() */
119
120 /*
121 * Keep track of min/max versions of NFS protocol to be started.
122 * Start with the defaults (min == 2, max == 3). We have the
123 * capability of starting vers=4 but only if the user requests it.
124 */
125 int nfs_server_vers_min = NFS_VERSMIN_DEFAULT;
126 int nfs_server_vers_max = NFS_VERSMAX_DEFAULT;
127
128 /*
129 * Set the default for server delegation enablement and set per
130 * /etc/default/nfs configuration (if present).
131 */
132 int nfs_server_delegation = NFS_SERVER_DELEGATION_DEFAULT;
133
134 int
main(int ac,char * av[])135 main(int ac, char *av[])
136 {
137 char *dir = "/";
138 int allflag = 0;
139 int df_allflag = 0;
140 int opt_cnt = 0;
141 int maxservers = 1; /* zero allows inifinte number of threads */
142 int maxservers_set = 0;
143 int logmaxservers = 0;
144 int pid;
145 int i;
146 char *provider = (char *)NULL;
147 char *df_provider = (char *)NULL;
148 struct protob *protobp0, *protobp;
149 NETSELDECL(proto) = NULL;
150 NETSELDECL(df_proto) = NULL;
151 NETSELPDECL(providerp);
152 char *defval;
153 boolean_t can_do_mlp;
154 uint_t dss_npaths = 0;
155 char **dss_pathnames = NULL;
156 sigset_t sgset;
157 char name[PATH_MAX], value[PATH_MAX];
158 int ret, bufsz;
159
160 int pipe_fd = -1;
161
162 MyName = *av;
163
164 /*
165 * Initializations that require more privileges than we need to run.
166 */
167 (void) _create_daemon_lock(NFSD, DAEMON_UID, DAEMON_GID);
168 svcsetprio();
169
170 can_do_mlp = priv_ineffect(PRIV_NET_BINDMLP);
171 if (__init_daemon_priv(PU_RESETGROUPS|PU_CLEARLIMITSET,
172 DAEMON_UID, DAEMON_GID, PRIV_SYS_NFS,
173 can_do_mlp ? PRIV_NET_BINDMLP : NULL, NULL) == -1) {
174 (void) fprintf(stderr, "%s should be run with"
175 " sufficient privileges\n", av[0]);
176 exit(1);
177 }
178
179 (void) enable_extended_FILE_stdio(-1, -1);
180
181 /*
182 * Read in the values from SMF first before we check
183 * command line options so the options override SMF values.
184 */
185 bufsz = PATH_MAX;
186 ret = nfs_smf_get_prop("max_connections", value, DEFAULT_INSTANCE,
187 SCF_TYPE_INTEGER, NFSD, &bufsz);
188 if (ret == SA_OK) {
189 errno = 0;
190 max_conns_allowed = strtol(value, (char **)NULL, 10);
191 if (errno != 0)
192 max_conns_allowed = -1;
193 }
194
195 bufsz = PATH_MAX;
196 ret = nfs_smf_get_prop("listen_backlog", value, DEFAULT_INSTANCE,
197 SCF_TYPE_INTEGER, NFSD, &bufsz);
198 if (ret == SA_OK) {
199 errno = 0;
200 listen_backlog = strtol(value, (char **)NULL, 10);
201 if (errno != 0) {
202 listen_backlog = 32;
203 }
204 }
205
206 bufsz = PATH_MAX;
207 ret = nfs_smf_get_prop("protocol", value, DEFAULT_INSTANCE,
208 SCF_TYPE_ASTRING, NFSD, &bufsz);
209 if ((ret == SA_OK) && strlen(value) > 0) {
210 df_proto = strdup(value);
211 opt_cnt++;
212 if (strncasecmp("ALL", value, 3) == 0) {
213 free(df_proto);
214 df_proto = NULL;
215 df_allflag = 1;
216 }
217 }
218
219 bufsz = PATH_MAX;
220 ret = nfs_smf_get_prop("device", value, DEFAULT_INSTANCE,
221 SCF_TYPE_ASTRING, NFSD, &bufsz);
222 if ((ret == SA_OK) && strlen(value) > 0) {
223 df_provider = strdup(value);
224 opt_cnt++;
225 }
226
227 bufsz = PATH_MAX;
228 ret = nfs_smf_get_prop("servers", value, DEFAULT_INSTANCE,
229 SCF_TYPE_INTEGER, NFSD, &bufsz);
230 if (ret == SA_OK) {
231 errno = 0;
232 maxservers = strtol(value, (char **)NULL, 10);
233 if (errno != 0)
234 maxservers = 1;
235 else
236 maxservers_set = 1;
237 }
238
239 bufsz = 4;
240 ret = nfs_smf_get_prop("server_versmin", value, DEFAULT_INSTANCE,
241 SCF_TYPE_INTEGER, NFSD, &bufsz);
242 if (ret == SA_OK)
243 nfs_server_vers_min = strtol(value, (char **)NULL, 10);
244
245 bufsz = 4;
246 ret = nfs_smf_get_prop("server_versmax", value, DEFAULT_INSTANCE,
247 SCF_TYPE_INTEGER, NFSD, &bufsz);
248 if (ret == SA_OK)
249 nfs_server_vers_max = strtol(value, (char **)NULL, 10);
250
251 bufsz = PATH_MAX;
252 ret = nfs_smf_get_prop("server_delegation", value, DEFAULT_INSTANCE,
253 SCF_TYPE_ASTRING, NFSD, &bufsz);
254 if (ret == SA_OK)
255 if (strncasecmp(value, "off", 3) == 0)
256 nfs_server_delegation = FALSE;
257
258 /*
259 * Conflict options error messages.
260 */
261 if (opt_cnt > 1) {
262 (void) fprintf(stderr, "\nConflicting options, only one of "
263 "the following options can be specified\n"
264 "in SMF:\n"
265 "\tprotocol=ALL\n"
266 "\tprotocol=protocol\n"
267 "\tdevice=devicename\n\n");
268 usage();
269 }
270 opt_cnt = 0;
271
272 while ((i = getopt(ac, av, "ac:p:s:t:l:")) != EOF) {
273 switch (i) {
274 case 'a':
275 free(df_proto);
276 df_proto = NULL;
277 free(df_provider);
278 df_provider = NULL;
279
280 allflag = 1;
281 opt_cnt++;
282 break;
283
284 case 'c':
285 max_conns_allowed = atoi(optarg);
286 break;
287
288 case 'p':
289 proto = optarg;
290 df_allflag = 0;
291 opt_cnt++;
292 break;
293
294 /*
295 * DSS: NFSv4 distributed stable storage.
296 *
297 * This is a Contracted Project Private interface, for
298 * the sole use of Sun Cluster HA-NFS. See PSARC/2006/313.
299 */
300 case 's':
301 if (strlen(optarg) < MAXPATHLEN) {
302 /* first "-s" option encountered? */
303 if (dss_pathnames == NULL) {
304 /*
305 * Allocate maximum possible space
306 * required given cmdline arg count;
307 * "-s <path>" consumes two args.
308 */
309 size_t sz = (ac / 2) * sizeof (char *);
310 dss_pathnames = (char **)malloc(sz);
311 if (dss_pathnames == NULL) {
312 (void) fprintf(stderr, "%s: "
313 "dss paths malloc failed\n",
314 av[0]);
315 exit(1);
316 }
317 (void) memset(dss_pathnames, 0, sz);
318 }
319 dss_pathnames[dss_npaths] = optarg;
320 dss_npaths++;
321 } else {
322 (void) fprintf(stderr,
323 "%s: -s pathname too long.\n", av[0]);
324 }
325 break;
326
327 case 't':
328 provider = optarg;
329 df_allflag = 0;
330 opt_cnt++;
331 break;
332
333 case 'l':
334 listen_backlog = atoi(optarg);
335 break;
336
337 case '?':
338 usage();
339 /* NOTREACHED */
340 }
341 }
342
343 allflag = df_allflag;
344 if (proto == NULL)
345 proto = df_proto;
346 if (provider == NULL)
347 provider = df_provider;
348
349 /*
350 * Conflict options error messages.
351 */
352 if (opt_cnt > 1) {
353 (void) fprintf(stderr, "\nConflicting options, only one of "
354 "the following options can be specified\n"
355 "on the command line:\n"
356 "\t-a\n"
357 "\t-p protocol\n"
358 "\t-t transport\n\n");
359 usage();
360 }
361
362 if (proto != NULL &&
363 strncasecmp(proto, NC_UDP, strlen(NC_UDP)) == 0) {
364 if (nfs_server_vers_max == NFS_V4) {
365 if (nfs_server_vers_min == NFS_V4) {
366 fprintf(stderr,
367 "NFS version 4 is not supported "
368 "with the UDP protocol. Exiting\n");
369 exit(3);
370 } else {
371 fprintf(stderr,
372 "NFS version 4 is not supported "
373 "with the UDP protocol.\n");
374 }
375 }
376 }
377
378 /*
379 * If there is exactly one more argument, it is the number of
380 * servers.
381 */
382 if (optind == ac - 1) {
383 maxservers = atoi(av[optind]);
384 maxservers_set = 1;
385 }
386 /*
387 * If there are two or more arguments, then this is a usage error.
388 */
389 else if (optind < ac - 1)
390 usage();
391 /*
392 * Check the ranges for min/max version specified
393 */
394 else if ((nfs_server_vers_min > nfs_server_vers_max) ||
395 (nfs_server_vers_min < NFS_VERSMIN) ||
396 (nfs_server_vers_max > NFS_VERSMAX))
397 usage();
398 /*
399 * There are no additional arguments, and we haven't set maxservers
400 * explicitly via the config file, we use a default number of
401 * servers. We will log this.
402 */
403 else if (maxservers_set == 0)
404 logmaxservers = 1;
405
406 /*
407 * Basic Sanity checks on options
408 *
409 * max_conns_allowed must be positive, except for the special
410 * value of -1 which is used internally to mean unlimited, -1 isn't
411 * documented but we allow it anyway.
412 *
413 * maxservers must be positive
414 * listen_backlog must be positive or zero
415 */
416 if (((max_conns_allowed != -1) && (max_conns_allowed <= 0)) ||
417 (listen_backlog < 0) || (maxservers <= 0)) {
418 usage();
419 }
420
421 /*
422 * Set current dir to server root
423 */
424 if (chdir(dir) < 0) {
425 (void) fprintf(stderr, "%s: ", MyName);
426 perror(dir);
427 exit(1);
428 }
429
430 #ifndef DEBUG
431 pipe_fd = daemonize_init();
432 #endif
433
434 openlog(MyName, LOG_PID | LOG_NDELAY, LOG_DAEMON);
435
436 /*
437 * establish our lock on the lock file and write our pid to it.
438 * exit if some other process holds the lock, or if there's any
439 * error in writing/locking the file.
440 */
441 pid = _enter_daemon_lock(NFSD);
442 switch (pid) {
443 case 0:
444 break;
445 case -1:
446 fprintf(stderr, "error locking for %s: %s", NFSD,
447 strerror(errno));
448 exit(2);
449 default:
450 /* daemon was already running */
451 exit(0);
452 }
453
454 /*
455 * If we've been given a list of paths to be used for distributed
456 * stable storage, and provided we're going to run a version
457 * that supports it, setup the DSS paths.
458 */
459 if (dss_pathnames != NULL && nfs_server_vers_max >= DSS_VERSMIN) {
460 if (dss_init(dss_npaths, dss_pathnames) != 0) {
461 fprintf(stderr, "%s", "dss_init failed. Exiting.");
462 exit(1);
463 }
464 }
465
466 /*
467 * Block all signals till we spawn other
468 * threads.
469 */
470 (void) sigfillset(&sgset);
471 (void) thr_sigsetmask(SIG_BLOCK, &sgset, NULL);
472
473 if (logmaxservers) {
474 fprintf(stderr,
475 "Number of servers not specified. Using default of %d.",
476 maxservers);
477 }
478
479 /*
480 * Make sure to unregister any previous versions in case the
481 * user is reconfiguring the server in interesting ways.
482 */
483 svc_unreg(NFS_PROGRAM, NFS_VERSION);
484 svc_unreg(NFS_PROGRAM, NFS_V3);
485 svc_unreg(NFS_PROGRAM, NFS_V4);
486 svc_unreg(NFS_ACL_PROGRAM, NFS_ACL_V2);
487 svc_unreg(NFS_ACL_PROGRAM, NFS_ACL_V3);
488
489 /*
490 * Set up kernel RPC thread pool for the NFS server.
491 */
492 if (nfssvcpool(maxservers)) {
493 fprintf(stderr, "Can't set up kernel NFS service: %s. Exiting",
494 strerror(errno));
495 exit(1);
496 }
497
498 /*
499 * Set up blocked thread to do LWP creation on behalf of the kernel.
500 */
501 if (svcwait(NFS_SVCPOOL_ID)) {
502 fprintf(stderr, "Can't set up NFS pool creator: %s. Exiting",
503 strerror(errno));
504 exit(1);
505 }
506
507 /*
508 * RDMA start and stop thread.
509 * Per pool RDMA listener creation and
510 * destructor thread.
511 *
512 * start rdma services and block in the kernel.
513 * (only if proto or provider is not set to TCP or UDP)
514 */
515 if ((proto == NULL) && (provider == NULL)) {
516 if (svcrdma(NFS_SVCPOOL_ID, nfs_server_vers_min,
517 nfs_server_vers_max, nfs_server_delegation)) {
518 fprintf(stderr,
519 "Can't set up RDMA creator thread : %s",
520 strerror(errno));
521 }
522 }
523
524 /*
525 * Now open up for signal delivery
526 */
527
528 (void) thr_sigsetmask(SIG_UNBLOCK, &sgset, NULL);
529 sigset(SIGTERM, sigflush);
530 sigset(SIGUSR1, quiesce);
531
532 /*
533 * Build a protocol block list for registration.
534 */
535 protobp0 = protobp = (struct protob *)malloc(sizeof (struct protob));
536 protobp->serv = "NFS";
537 protobp->versmin = nfs_server_vers_min;
538 protobp->versmax = nfs_server_vers_max;
539 protobp->program = NFS_PROGRAM;
540
541 protobp->next = (struct protob *)malloc(sizeof (struct protob));
542 protobp = protobp->next;
543 protobp->serv = "NFS_ACL"; /* not used */
544 protobp->versmin = nfs_server_vers_min;
545 /* XXX - this needs work to get the version just right */
546 protobp->versmax = (nfs_server_vers_max > NFS_ACL_V3) ?
547 NFS_ACL_V3 : nfs_server_vers_max;
548 protobp->program = NFS_ACL_PROGRAM;
549 protobp->next = (struct protob *)NULL;
550
551 if (allflag) {
552 if (do_all(protobp0, nfssvc) == -1) {
553 fprintf(stderr, "setnetconfig failed : %s",
554 strerror(errno));
555 exit(1);
556 }
557 } else if (proto) {
558 /* there's more than one match for the same protocol */
559 struct netconfig *nconf;
560 NCONF_HANDLE *nc;
561 bool_t protoFound = FALSE;
562 if ((nc = setnetconfig()) == (NCONF_HANDLE *) NULL) {
563 fprintf(stderr, "setnetconfig failed : %s",
564 strerror(errno));
565 goto done;
566 }
567 while (nconf = getnetconfig(nc)) {
568 if (strcmp(nconf->nc_proto, proto) == 0) {
569 protoFound = TRUE;
570 do_one(nconf->nc_device, NULL,
571 protobp0, nfssvc);
572 }
573 }
574 (void) endnetconfig(nc);
575 if (protoFound == FALSE) {
576 fprintf(stderr,
577 "couldn't find netconfig entry for protocol %s",
578 proto);
579 }
580 } else if (provider)
581 do_one(provider, proto, protobp0, nfssvc);
582 else {
583 for (providerp = defaultproviders;
584 *providerp != NULL; providerp++) {
585 provider = *providerp;
586 do_one(provider, NULL, protobp0, nfssvc);
587 }
588 }
589 done:
590
591 free(protobp);
592 free(protobp0);
593
594 if (num_fds == 0) {
595 fprintf(stderr, "Could not start NFS service for any protocol."
596 " Exiting");
597 exit(1);
598 }
599
600 end_listen_fds = num_fds;
601
602 /*
603 * nfsd is up and running as far as we are concerned.
604 */
605 daemonize_fini(pipe_fd);
606
607 /*
608 * Get rid of unneeded privileges.
609 */
610 __fini_daemon_priv(PRIV_PROC_FORK, PRIV_PROC_EXEC, PRIV_PROC_SESSION,
611 PRIV_FILE_LINK_ANY, PRIV_PROC_INFO, (char *)NULL);
612
613 /*
614 * Poll for non-data control events on the transport descriptors.
615 */
616 poll_for_action();
617
618 /*
619 * If we get here, something failed in poll_for_action().
620 */
621 return (1);
622 }
623
624 static int
nfssvcpool(int maxservers)625 nfssvcpool(int maxservers)
626 {
627 struct svcpool_args npa;
628
629 npa.id = NFS_SVCPOOL_ID;
630 npa.maxthreads = maxservers;
631 npa.redline = 0;
632 npa.qsize = 0;
633 npa.timeout = 0;
634 npa.stksize = 0;
635 npa.max_same_xprt = 0;
636 return (_nfssys(SVCPOOL_CREATE, &npa));
637 }
638
639 /*
640 * Establish NFS service thread.
641 */
642 static int
nfssvc(int fd,struct netbuf addrmask,struct netconfig * nconf)643 nfssvc(int fd, struct netbuf addrmask, struct netconfig *nconf)
644 {
645 struct nfs_svc_args nsa;
646
647 nsa.fd = fd;
648 nsa.netid = nconf->nc_netid;
649 nsa.addrmask = addrmask;
650 if (strncasecmp(nconf->nc_proto, NC_UDP, strlen(NC_UDP)) == 0) {
651 nsa.versmax = (nfs_server_vers_max > NFS_V3) ?
652 NFS_V3 : nfs_server_vers_max;
653 nsa.versmin = nfs_server_vers_min;
654 /*
655 * If no version left, silently do nothing, previous
656 * checks will have assured at least TCP is available.
657 */
658 if (nsa.versmin > nsa.versmax)
659 return (0);
660 } else {
661 nsa.versmax = nfs_server_vers_max;
662 nsa.versmin = nfs_server_vers_min;
663 }
664 nsa.delegation = nfs_server_delegation;
665 return (_nfssys(NFS_SVC, &nsa));
666 }
667
668 static void
usage(void)669 usage(void)
670 {
671 (void) fprintf(stderr,
672 "usage: %s [ -a ] [ -c max_conns ] [ -p protocol ] [ -t transport ] ", MyName);
673 (void) fprintf(stderr, "\n[ -l listen_backlog ] [ nservers ]\n");
674 (void) fprintf(stderr,
675 "\twhere -a causes <nservers> to be started on each appropriate transport,\n");
676 (void) fprintf(stderr,
677 "\tmax_conns is the maximum number of concurrent connections allowed,\n");
678 (void) fprintf(stderr, "\t\tand max_conns must be a decimal number");
679 (void) fprintf(stderr, "> zero,\n");
680 (void) fprintf(stderr, "\tprotocol is a protocol identifier,\n");
681 (void) fprintf(stderr,
682 "\ttransport is a transport provider name (i.e. device),\n");
683 (void) fprintf(stderr,
684 "\tlisten_backlog is the TCP listen backlog,\n");
685 (void) fprintf(stderr,
686 "\tand <nservers> must be a decimal number > zero.\n");
687 exit(1);
688 }
689
690 /*
691 * Issue nfssys system call to flush all logging buffers asynchronously.
692 *
693 * NOTICE: It is extremely important to flush NFS logging buffers when
694 * nfsd exits. When the system is halted or rebooted nfslogd
695 * may not have an opportunity to flush the buffers.
696 */
697 static void
nfsl_flush()698 nfsl_flush()
699 {
700 struct nfsl_flush_args nfa;
701
702 memset((void *)&nfa, 0, sizeof (nfa));
703 nfa.version = NFSL_FLUSH_ARGS_VERS;
704 nfa.directive = NFSL_ALL; /* flush all asynchronously */
705
706 if (_nfssys(LOG_FLUSH, &nfa) < 0)
707 syslog(LOG_ERR, "_nfssys(LOG_FLUSH) failed: %s\n",
708 strerror(errno));
709 }
710
711 /*
712 * SIGTERM handler.
713 * Flush logging buffers and exit.
714 */
715 static void
sigflush(int sig)716 sigflush(int sig)
717 {
718 nfsl_flush();
719 _exit(0);
720 }
721
722 /*
723 * SIGUSR1 handler.
724 *
725 * Request that server quiesce, then (nfsd) exit. For subsequent warm start.
726 *
727 * This is a Contracted Project Private interface, for the sole use
728 * of Sun Cluster HA-NFS. See PSARC/2004/497.
729 *
730 * Equivalent to SIGTERM handler if nfs_server_vers_max < QUIESCE_VERSMIN.
731 */
732 static void
quiesce(int sig)733 quiesce(int sig)
734 {
735 int error;
736 int id = NFS_SVCPOOL_ID;
737
738 if (nfs_server_vers_max >= QUIESCE_VERSMIN) {
739 /* Request server quiesce at next shutdown */
740 error = _nfssys(NFS4_SVC_REQUEST_QUIESCE, &id);
741
742 /*
743 * ENOENT is returned if there is no matching SVC pool
744 * for the id. Possibly because the pool is not yet setup.
745 * In this case, just exit as if no error. For all other errors,
746 * just return and allow caller to retry.
747 */
748 if (error && errno != ENOENT) {
749 syslog(LOG_ERR,
750 "_nfssys(NFS4_SVC_REQUEST_QUIESCE) failed: %s",
751 strerror(errno));
752 return;
753 }
754 }
755
756 /* Flush logging buffers */
757 nfsl_flush();
758
759 _exit(0);
760 }
761
762 /*
763 * DSS: distributed stable storage.
764 * Create leaf directories as required, keeping an eye on path
765 * lengths. Calls exit(1) on failure.
766 * The pathnames passed in must already exist, and must be writeable by nfsd.
767 * Note: the leaf directories under NFS4_VAR_DIR are not created here;
768 * they're created at pkg install.
769 */
770 static void
dss_mkleafdirs(uint_t npaths,char ** pathnames)771 dss_mkleafdirs(uint_t npaths, char **pathnames)
772 {
773 int i;
774 char *tmppath = NULL;
775
776 /*
777 * Create the temporary storage used by dss_mkleafdir() here,
778 * rather than in that function, so that it only needs to be
779 * done once, rather than once for each call. Too big to put
780 * on the function's stack.
781 */
782 tmppath = (char *)malloc(MAXPATHLEN);
783 if (tmppath == NULL) {
784 syslog(LOG_ERR, "tmppath malloc failed. Exiting");
785 exit(1);
786 }
787
788 for (i = 0; i < npaths; i++) {
789 char *p = pathnames[i];
790
791 dss_mkleafdir(p, NFS4_DSS_STATE_LEAF, tmppath);
792 dss_mkleafdir(p, NFS4_DSS_OLDSTATE_LEAF, tmppath);
793 }
794
795 free(tmppath);
796 }
797
798 /*
799 * Create "leaf" in "dir" (which must already exist).
800 * leaf: should start with a '/'
801 */
802 static void
dss_mkleafdir(char * dir,char * leaf,char * tmppath)803 dss_mkleafdir(char *dir, char *leaf, char *tmppath)
804 {
805 /* MAXPATHLEN includes the terminating NUL */
806 if (strlen(dir) + strlen(leaf) > MAXPATHLEN - 1) {
807 fprintf(stderr, "stable storage path too long: %s%s. Exiting",
808 dir, leaf);
809 exit(1);
810 }
811
812 (void) snprintf(tmppath, MAXPATHLEN, "%s/%s", dir, leaf);
813
814 /* the directory may already exist: that's OK */
815 if (mkdir(tmppath, NFS4_DSS_DIR_MODE) == -1 && errno != EEXIST) {
816 fprintf(stderr, "error creating stable storage directory: "
817 "%s: %s. Exiting", strerror(errno), tmppath);
818 exit(1);
819 }
820 }
821
822 /*
823 * Create the storage dirs, and pass the path list to the kernel.
824 * This requires the nfssrv module to be loaded; the _nfssys() syscall
825 * will fail ENOTSUP if it is not.
826 * Use libnvpair(3LIB) to pass the data to the kernel.
827 */
828 static int
dss_init(uint_t npaths,char ** pathnames)829 dss_init(uint_t npaths, char **pathnames)
830 {
831 int i, j, nskipped, error;
832 char *bufp;
833 uint32_t bufsize;
834 size_t buflen;
835 nvlist_t *nvl;
836
837 if (npaths > 1) {
838 /*
839 * We need to remove duplicate paths; this might be user error
840 * in the general case, but HA-NFSv4 can also cause this.
841 * Sort the pathnames array, and NULL out duplicates,
842 * then write the non-NULL entries to a new array.
843 * Sorting will also allow the kernel to optimise its searches.
844 */
845
846 qsort(pathnames, npaths, sizeof (char *), qstrcmp);
847
848 /* now NULL out any duplicates */
849 i = 0; j = 1; nskipped = 0;
850 while (j < npaths) {
851 if (strcmp(pathnames[i], pathnames[j]) == NULL) {
852 pathnames[j] = NULL;
853 j++;
854 nskipped++;
855 continue;
856 }
857
858 /* skip i over any of its NULLed duplicates */
859 i = j++;
860 }
861
862 /* finally, write the non-NULL entries to a new array */
863 if (nskipped > 0) {
864 int nreal;
865 size_t sz;
866 char **tmp_pathnames;
867
868 nreal = npaths - nskipped;
869
870 sz = nreal * sizeof (char *);
871 tmp_pathnames = (char **)malloc(sz);
872 if (tmp_pathnames == NULL) {
873 fprintf(stderr, "tmp_pathnames malloc failed");
874 exit(1);
875 }
876
877 for (i = 0, j = 0; i < npaths; i++)
878 if (pathnames[i] != NULL)
879 tmp_pathnames[j++] = pathnames[i];
880 free(pathnames);
881 pathnames = tmp_pathnames;
882 npaths = nreal;
883 }
884
885 }
886
887 /* Create directories to store the distributed state files */
888 dss_mkleafdirs(npaths, pathnames);
889
890 /* Create the name-value pair list */
891 error = nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0);
892 if (error) {
893 fprintf(stderr, "nvlist_alloc failed: %s.", strerror(errno));
894 return (1);
895 }
896
897 /* Add the pathnames array as a single name-value pair */
898 error = nvlist_add_string_array(nvl, NFS4_DSS_NVPAIR_NAME,
899 pathnames, npaths);
900 if (error) {
901 fprintf(stderr, "nvlist_add_string_array failed: %s.",
902 strerror(errno));
903 nvlist_free(nvl);
904 return (1);
905 }
906
907 /*
908 * Pack list into contiguous memory, for passing to kernel.
909 * nvlist_pack() will allocate the memory for the buffer,
910 * which we should free() when no longer needed.
911 * NV_ENCODE_XDR for safety across ILP32/LP64 kernel boundary.
912 */
913 bufp = NULL;
914 error = nvlist_pack(nvl, &bufp, &buflen, NV_ENCODE_XDR, 0);
915 if (error) {
916 fprintf(stderr, "nvlist_pack failed: %s.", strerror(errno));
917 nvlist_free(nvl);
918 return (1);
919 }
920
921 /* Now we have the packed buffer, we no longer need the list */
922 nvlist_free(nvl);
923
924 /*
925 * Let the kernel know in advance how big the buffer is.
926 * NOTE: we cannot just pass buflen, since size_t is a long, and
927 * thus a different size between ILP32 userland and LP64 kernel.
928 * Use an int for the transfer, since that should be big enough;
929 * this is a no-op at the moment, here, since nfsd is 32-bit, but
930 * that could change.
931 */
932 bufsize = (uint32_t)buflen;
933 error = _nfssys(NFS4_DSS_SETPATHS_SIZE, &bufsize);
934 if (error) {
935 fprintf(stderr,
936 "_nfssys(NFS4_DSS_SETPATHS_SIZE) failed: %s. ",
937 strerror(errno));
938 free(bufp);
939 return (1);
940 }
941
942 /* Pass the packed buffer to the kernel */
943 error = _nfssys(NFS4_DSS_SETPATHS, bufp);
944 if (error) {
945 fprintf(stderr,
946 "_nfssys(NFS4_DSS_SETPATHS) failed: %s. ", strerror(errno));
947 free(bufp);
948 return (1);
949 }
950
951 /*
952 * The kernel has now unpacked the buffer and extracted the
953 * pathnames array, we no longer need the buffer.
954 */
955 free(bufp);
956
957 return (0);
958 }
959
960 /*
961 * Quick sort string compare routine, for qsort.
962 * Needed to make arg types correct.
963 */
964 int
qstrcmp(const void * p1,const void * p2)965 qstrcmp(const void *p1, const void *p2)
966 {
967 char *s1 = *((char **)p1);
968 char *s2 = *((char **)p2);
969
970 return (strcmp(s1, s2));
971 }
972