sbin/hammer2/cmd_service.c

   1 /*
   2  * Copyright (c) 2011-2012 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@dragonflybsd.org>
   6  * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
   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  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "hammer2.h"
  37
  38 #include <sys/xdiskioctl.h>
  39 #include <machine/atomic.h>
  40
  41 struct hammer2_media_config {
  42         hammer2_volconf_t       copy_run;
  43         hammer2_volconf_t       copy_pend;
  44         pthread_t               thread;
  45         pthread_cond_t          cond;
  46         int                     ctl;
  47         int                     fd;
  48         int                     pipefd[2];      /* signal stop */
  49         dmsg_iocom_t            iocom;
  50         pthread_t               iocom_thread;
  51         enum { H2MC_STOPPED, H2MC_CONNECT, H2MC_RUNNING } state;
  52 };
  53
  54 typedef struct hammer2_media_config hammer2_media_config_t;
  55
  56 #define H2CONFCTL_STOP          0x00000001
  57 #define H2CONFCTL_UPDATE        0x00000002
  58
  59 struct diskcon {
  60         TAILQ_ENTRY(diskcon) entry;
  61         char    *disk;
  62 };
  63
  64 struct service_node_opaque {
  65         char    cl_label[64];
  66         char    fs_label[64];
  67         dmsg_media_block_t block;
  68         int     attached;
  69         int     servicing;
  70         int     servicefd;
  71 };
  72
  73 struct autoconn {
  74         TAILQ_ENTRY(autoconn) entry;
  75         char    *host;
  76         int     stage;
  77         int     stopme;
  78         int     pipefd[2];      /* {read,write} */
  79         enum { AUTOCONN_INACTIVE, AUTOCONN_ACTIVE } state;
  80         pthread_t thread;
  81 };
  82
  83 #define WS " \r\n"
  84
  85 TAILQ_HEAD(, diskcon) diskconq = TAILQ_HEAD_INITIALIZER(diskconq);
  86 static pthread_mutex_t diskmtx;
  87 static pthread_mutex_t confmtx;
  88
  89 static void *service_thread(void *data);
  90 static void *udev_thread(void *data);
  91 static void *autoconn_thread(void *data);
  92 static void master_reconnect(const char *mntpt);
  93 static void disk_reconnect(const char *disk);
  94 static void disk_disconnect(void *handle);
  95 static void udev_check_disks(void);
  96 static void hammer2_usrmsg_handler(dmsg_msg_t *msg, int unmanaged);
  97 static void *hammer2_volconf_thread(void *info);
  98 static void hammer2_volconf_signal(dmsg_iocom_t *iocom);
  99 static void hammer2_volconf_start(hammer2_media_config_t *conf,
 100                         const char *hostname);
 101 static void hammer2_volconf_stop(hammer2_media_config_t *conf);
 102
 103
 104 static void xdisk_connect(void);
 105
 106 /*
 107  * Start-up the master listener daemon for the machine.  This daemon runs
 108  * a UDP discovery protocol, a TCP rendezvous, and scans certain files
 109  * and directories for work.
 110  *
 111  * --
 112  *
 113  * The only purpose for the UDP discovery protocol is to determine what
 114  * other IPs on the LAN are running the hammer2 service daemon.  DNS is not
 115  * required to operate, but hostnames (if assigned) must be unique.  If
 116  * no hostname is assigned the host's IP is used as the name.  This name
 117  * is broadcast along with the mtime of the originator's private key.
 118  *
 119  * Receiving hammer2 service daemons which are able to match the label against
 120  * /etc/hammer2/remote/<label>.pub will initiate a persistent connection
 121  * to the target.  Removal of the file will cause a disconnection.  A failed
 122  * public key negotiation stops further connection attempts until either the
 123  * file is updated or the remote mtime is updated.
 124  *
 125  * Generally speaking this results in a web of connections, typically a
 126  * combination of point-to-point for the more important links and relayed
 127  * (spanning tree) for less important or filtered links.
 128  *
 129  * --
 130  *
 131  * The TCP listener serves as a rendezvous point in the cluster, accepting
 132  * connections, performing registrations and authentications, maintaining
 133  * the spanning tree, and keeping track of message state so disconnects can
 134  * be handled properly.
 135  *
 136  * Once authenticated only low-level messaging protocols (which includes
 137  * tracking persistent messages) are handled by this daemon.  This daemon
 138  * does not run the higher level quorum or locking protocols.
 139  *
 140  * --
 141  *
 142  * The file /etc/hammer2/autoconn, if it exists, contains a list of targets
 143  * to connect to (which do not have to be on the local lan).  This list will
 144  * be retried until a connection can be established.  The file is not usually
 145  * needed for linkages local to the LAN.
 146  */
 147 int
 148 cmd_service(void)
 149 {
 150         struct sockaddr_in lsin;
 151         int on;
 152         int lfd;
 153
 154         /*
 155          * Acquire socket and set options
 156          */
 157         if ((lfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
 158                 fprintf(stderr, "master_listen: socket(): %s\n",
 159                         strerror(errno));
 160                 return 1;
 161         }
 162         on = 1;
 163         setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 164
 165         /*
 166          * Setup listen port and try to bind.  If the bind fails we assume
 167          * that a master listener process is already running and silently
 168          * fail.
 169          */
 170         bzero(&lsin, sizeof(lsin));
 171         lsin.sin_family = AF_INET;
 172         lsin.sin_addr.s_addr = INADDR_ANY;
 173         lsin.sin_port = htons(DMSG_LISTEN_PORT);
 174         if (bind(lfd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
 175                 close(lfd);
 176                 if (QuietOpt == 0) {
 177                         fprintf(stderr,
 178                                 "master listen: daemon already running\n");
 179                 }
 180                 return 0;
 181         }
 182         if (QuietOpt == 0)
 183                 fprintf(stderr, "master listen: startup\n");
 184         listen(lfd, 50);
 185
 186         /*
 187          * Fork and disconnect the controlling terminal and parent process,
 188          * executing the specified function as a pthread.
 189          *
 190          * Returns to the original process which can then continue running.
 191          * In debug mode this call will create the pthread without forking
 192          * and set NormalExit to 0, instead of fork.
 193          */
 194         hammer2_demon(service_thread, (void *)(intptr_t)lfd);
 195         if (NormalExit)
 196                 close(lfd);
 197         return 0;
 198 }
 199
 200 /*
 201  * Master listen/accept thread.  Accept connections on the master socket,
 202  * starting a pthread for each one.
 203  */
 204 static
 205 void *
 206 service_thread(void *data)
 207 {
 208         struct sockaddr_in asin;
 209         socklen_t alen;
 210         pthread_t thread;
 211         dmsg_master_service_info_t *info;
 212         int lfd = (int)(intptr_t)data;
 213         int fd;
 214         int i;
 215         int count;
 216         int opt;
 217         struct statfs *mntbuf = NULL;
 218         struct statvfs *mntvbuf = NULL;
 219
 220         /*
 221          * Nobody waits for us
 222          */
 223         setproctitle("hammer2 master listen");
 224         pthread_detach(pthread_self());
 225
 226         /*
 227          * Start up a thread to handle block device monitoring for
 228          * export to the cluster.
 229          */
 230         thread = NULL;
 231         pthread_create(&thread, NULL, udev_thread, NULL);
 232
 233         /*
 234          * Start up a thread to tie /dev/xdisk into the cluster
 235          * controller.
 236          */
 237         xdisk_connect();
 238
 239         /*
 240          * Start thread to manage /etc/hammer2/autoconn
 241          */
 242         thread = NULL;
 243         pthread_create(&thread, NULL, autoconn_thread, NULL);
 244
 245         /*
 246          * Scan existing hammer2 mounts and reconnect to them using
 247          * HAMMER2IOC_RECLUSTER.
 248          */
 249         count = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 250         for (i = 0; i < count; ++i) {
 251                 if (strcmp(mntbuf[i].f_fstypename, "hammer2") == 0)
 252                         master_reconnect(mntbuf[i].f_mntonname);
 253         }
 254
 255         /*
 256          * Accept connections and create pthreads to handle them after
 257          * validating the IP.
 258          */
 259         for (;;) {
 260                 alen = sizeof(asin);
 261                 fd = accept(lfd, (struct sockaddr *)&asin, &alen);
 262                 if (fd < 0) {
 263                         if (errno == EINTR)
 264                                 continue;
 265                         break;
 266                 }
 267                 opt = 1;
 268                 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt);
 269                 thread = NULL;
 270                 fprintf(stderr, "service_thread: accept fd %d\n", fd);
 271                 info = malloc(sizeof(*info));
 272                 bzero(info, sizeof(*info));
 273                 info->fd = fd;
 274                 info->detachme = 1;
 275                 info->usrmsg_callback = hammer2_usrmsg_handler;
 276                 info->label = strdup("client");
 277                 pthread_create(&thread, NULL, dmsg_master_service, info);
 278         }
 279         return (NULL);
 280 }
 281
 282 /*
 283  * Handle/Monitor the dmsg stream.  If unmanaged is set we are responsible
 284  * for responding for the message, otherwise if it is not set libdmsg has
 285  * already done some preprocessing and will respond to the message for us
 286  * when we return.
 287  *
 288  * We primarily monitor for VOLCONFs
 289  */
 290 static
 291 void
 292 hammer2_usrmsg_handler(dmsg_msg_t *msg, int unmanaged)
 293 {
 294         dmsg_state_t *state;
 295         hammer2_media_config_t *conf;
 296         dmsg_lnk_hammer2_volconf_t *msgconf;
 297         int i;
 298
 299         /*
 300          * Only process messages which are part of a LNK_CONN stream
 301          */
 302         state = msg->state;
 303         if (state == NULL ||
 304             (state->rxcmd & DMSGF_BASECMDMASK) != DMSG_LNK_CONN) {
 305                 hammer2_shell_parse(msg, unmanaged);
 306                 return;
 307         }
 308
 309         switch(msg->tcmd) {
 310         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_DELETE:
 311         case DMSG_LNK_CONN | DMSGF_DELETE:
 312         case DMSG_LNK_ERROR | DMSGF_DELETE:
 313                 /*
 314                  * Deleting connection, clean out all volume configs
 315                  */
 316                 if (state->media == NULL || state->media->usrhandle == NULL)
 317                         break;
 318                 conf = state->media->usrhandle;
 319                 fprintf(stderr, "Shutting down media spans\n");
 320                 for (i = 0; i < HAMMER2_COPYID_COUNT; ++i) {
 321                         if (conf[i].thread) {
 322                                 conf[i].ctl = H2CONFCTL_STOP;
 323                                 pthread_cond_signal(&conf[i].cond);
 324                         }
 325                 }
 326                 for (i = 0; i < HAMMER2_COPYID_COUNT; ++i) {
 327                         if (conf[i].thread) {
 328                                 pthread_join(conf[i].thread, NULL);
 329                                 conf->thread = NULL;
 330                                 pthread_cond_destroy(&conf[i].cond);
 331                         }
 332                 }
 333                 state->media->usrhandle = NULL;
 334                 free(conf);
 335                 break;
 336         case DMSG_LNK_HAMMER2_VOLCONF:
 337                 /*
 338                  * One-way volume-configuration message is transmitted
 339                  * over the open LNK_CONN transaction.
 340                  */
 341                 fprintf(stderr, "RECEIVED VOLCONF\n");
 342
 343                 if ((conf = state->media->usrhandle) == NULL) {
 344                         conf = malloc(sizeof(*conf) * HAMMER2_COPYID_COUNT);
 345                         bzero(conf, sizeof(*conf) * HAMMER2_COPYID_COUNT);
 346                         state->media->usrhandle = conf;
 347                 }
 348                 msgconf = H2_LNK_VOLCONF(msg);
 349
 350                 if (msgconf->index < 0 ||
 351                     msgconf->index >= HAMMER2_COPYID_COUNT) {
 352                         fprintf(stderr,
 353                                 "VOLCONF: ILLEGAL INDEX %d\n",
 354                                 msgconf->index);
 355                         break;
 356                 }
 357                 if (msgconf->copy.path[sizeof(msgconf->copy.path) - 1] != 0 ||
 358                     msgconf->copy.path[0] == 0) {
 359                         fprintf(stderr,
 360                                 "VOLCONF: ILLEGAL PATH %d\n",
 361                                 msgconf->index);
 362                         break;
 363                 }
 364                 conf += msgconf->index;
 365                 pthread_mutex_lock(&confmtx);
 366                 conf->copy_pend = msgconf->copy;
 367                 conf->ctl |= H2CONFCTL_UPDATE;
 368                 pthread_mutex_unlock(&confmtx);
 369                 if (conf->thread == NULL) {
 370                         fprintf(stderr, "VOLCONF THREAD STARTED\n");
 371                         pthread_cond_init(&conf->cond, NULL);
 372                         pthread_create(&conf->thread, NULL,
 373                                        hammer2_volconf_thread, (void *)conf);
 374                 }
 375                 pthread_cond_signal(&conf->cond);
 376                 break;
 377         default:
 378                 if (unmanaged)
 379                         dmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
 380                 break;
 381         }
 382 }
 383
 384 static void *
 385 hammer2_volconf_thread(void *info)
 386 {
 387         hammer2_media_config_t *conf = info;
 388
 389         pthread_mutex_lock(&confmtx);
 390         while ((conf->ctl & H2CONFCTL_STOP) == 0) {
 391                 if (conf->ctl & H2CONFCTL_UPDATE) {
 392                         fprintf(stderr, "VOLCONF UPDATE\n");
 393                         conf->ctl &= ~H2CONFCTL_UPDATE;
 394                         if (bcmp(&conf->copy_run, &conf->copy_pend,
 395                                  sizeof(conf->copy_run)) == 0) {
 396                                 fprintf(stderr, "VOLCONF: no changes\n");
 397                                 continue;
 398                         }
 399                         /*
 400                          * XXX TODO - auto reconnect on lookup failure or
 401                          *              connect failure or stream failure.
 402                          */
 403
 404                         pthread_mutex_unlock(&confmtx);
 405                         hammer2_volconf_stop(conf);
 406                         conf->copy_run = conf->copy_pend;
 407                         if (conf->copy_run.copyid != 0 &&
 408                             strncmp(conf->copy_run.path, "span:", 5) == 0) {
 409                                 hammer2_volconf_start(conf,
 410                                                       conf->copy_run.path + 5);
 411                         }
 412                         pthread_mutex_lock(&confmtx);
 413                         fprintf(stderr, "VOLCONF UPDATE DONE state %d\n", conf->state);
 414                 }
 415                 if (conf->state == H2MC_CONNECT) {
 416                         hammer2_volconf_start(conf, conf->copy_run.path + 5);
 417                         pthread_mutex_unlock(&confmtx);
 418                         sleep(5);
 419                         pthread_mutex_lock(&confmtx);
 420                 } else {
 421                         pthread_cond_wait(&conf->cond, &confmtx);
 422                 }
 423         }
 424         pthread_mutex_unlock(&confmtx);
 425         hammer2_volconf_stop(conf);
 426         return(NULL);
 427 }
 428
 429 static
 430 void
 431 hammer2_volconf_start(hammer2_media_config_t *conf, const char *hostname)
 432 {
 433         dmsg_master_service_info_t *info;
 434
 435         switch(conf->state) {
 436         case H2MC_STOPPED:
 437         case H2MC_CONNECT:
 438                 conf->fd = dmsg_connect(hostname);
 439                 if (conf->fd < 0) {
 440                         fprintf(stderr, "Unable to connect to %s\n", hostname);
 441                         conf->state = H2MC_CONNECT;
 442                 } else if (pipe(conf->pipefd) < 0) {
 443                         close(conf->fd);
 444                         fprintf(stderr, "pipe() failed during volconf\n");
 445                         conf->state = H2MC_CONNECT;
 446                 } else {
 447                         fprintf(stderr, "VOLCONF CONNECT\n");
 448                         info = malloc(sizeof(*info));
 449                         bzero(info, sizeof(*info));
 450                         info->fd = conf->fd;
 451                         info->altfd = conf->pipefd[0];
 452                         info->altmsg_callback = hammer2_volconf_signal;
 453                         info->usrmsg_callback = hammer2_usrmsg_handler;
 454                         info->detachme = 0;
 455                         conf->state = H2MC_RUNNING;
 456                         pthread_create(&conf->iocom_thread, NULL,
 457                                        dmsg_master_service, info);
 458                 }
 459                 break;
 460         case H2MC_RUNNING:
 461                 break;
 462         }
 463 }
 464
 465 static
 466 void
 467 hammer2_volconf_stop(hammer2_media_config_t *conf)
 468 {
 469         switch(conf->state) {
 470         case H2MC_STOPPED:
 471                 break;
 472         case H2MC_CONNECT:
 473                 conf->state = H2MC_STOPPED;
 474                 break;
 475         case H2MC_RUNNING:
 476                 close(conf->pipefd[1]);
 477                 conf->pipefd[1] = -1;
 478                 pthread_join(conf->iocom_thread, NULL);
 479                 conf->iocom_thread = NULL;
 480                 conf->state = H2MC_STOPPED;
 481                 break;
 482         }
 483 }
 484
 485 static
 486 void
 487 hammer2_volconf_signal(dmsg_iocom_t *iocom)
 488 {
 489         atomic_set_int(&iocom->flags, DMSG_IOCOMF_EOF);
 490 }
 491
 492 /*
 493  * Monitor block devices.  Currently polls every ~10 seconds or so.
 494  */
 495 static
 496 void *
 497 udev_thread(void *data __unused)
 498 {
 499         int     fd;
 500         int     seq = 0;
 501
 502         pthread_detach(pthread_self());
 503
 504         if ((fd = open(UDEV_DEVICE_PATH, O_RDWR)) < 0) {
 505                 fprintf(stderr, "udev_thread: unable to open \"%s\"\n",
 506                         UDEV_DEVICE_PATH);
 507                 pthread_exit(NULL);
 508         }
 509         udev_check_disks();
 510         while (ioctl(fd, UDEVWAIT, &seq) == 0) {
 511                 udev_check_disks();
 512                 sleep(1);
 513         }
 514         return (NULL);
 515 }
 516
 517 static void *autoconn_connect_thread(void *data);
 518 static void autoconn_disconnect_signal(dmsg_iocom_t *iocom);
 519
 520 static
 521 void *
 522 autoconn_thread(void *data __unused)
 523 {
 524         TAILQ_HEAD(, autoconn) autolist;
 525         struct autoconn *ac;
 526         struct autoconn *next;
 527         pthread_t thread;
 528         struct stat st;
 529         time_t  t;
 530         time_t  lmod;
 531         int     found_last;
 532         FILE    *fp;
 533         char    buf[256];
 534
 535         TAILQ_INIT(&autolist);
 536         found_last = 0;
 537         lmod = 0;
 538
 539         pthread_detach(pthread_self());
 540         for (;;) {
 541                 /*
 542                  * Polling interval
 543                  */
 544                 sleep(5);
 545
 546                 /*
 547                  * Poll the file.  Loop up if the synchronized state (lmod)
 548                  * has not changed.
 549                  */
 550                 if (stat(HAMMER2_DEFAULT_DIR "/autoconn", &st) == 0) {
 551                         if (lmod == st.st_mtime)
 552                                 continue;
 553                         fp = fopen(HAMMER2_DEFAULT_DIR "/autoconn", "r");
 554                         if (fp == NULL)
 555                                 continue;
 556                 } else {
 557                         if (lmod == 0)
 558                                 continue;
 559                         fp = NULL;
 560                 }
 561
 562                 /*
 563                  * Wait at least 5 seconds after the file is created or
 564                  * removed.
 565                  *
 566                  * Do not update the synchronized state.
 567                  */
 568                 if (fp == NULL && found_last) {
 569                         found_last = 0;
 570                         continue;
 571                 } else if (fp && found_last == 0) {
 572                         fclose(fp);
 573                         found_last = 1;
 574                         continue;
 575                 }
 576
 577                 /*
 578                  * Don't scan the file until the time progresses past the
 579                  * file's mtime, so we can validate that the file was not
 580                  * further modified during our scan.
 581                  *
 582                  * Do not update the synchronized state.
 583                  */
 584                 time(&t);
 585                 if (fp) {
 586                         if (t == st.st_mtime) {
 587                                 fclose(fp);
 588                                 continue;
 589                         }
 590                         t = st.st_mtime;
 591                 } else {
 592                         t = 0;
 593                 }
 594
 595                 /*
 596                  * Set staging to disconnect, then scan the file.
 597                  */
 598                 TAILQ_FOREACH(ac, &autolist, entry)
 599                         ac->stage = 0;
 600                 while (fp && fgets(buf, sizeof(buf), fp) != NULL) {
 601                         char *host;
 602
 603                         if ((host = strtok(buf, " \t\r\n")) == NULL ||
 604                             host[0] == '#') {
 605                                 continue;
 606                         }
 607                         TAILQ_FOREACH(ac, &autolist, entry) {
 608                                 if (strcmp(host, ac->host) == 0)
 609                                         break;
 610                         }
 611                         if (ac == NULL) {
 612                                 ac = malloc(sizeof(*ac));
 613                                 bzero(ac, sizeof(*ac));
 614                                 ac->host = strdup(host);
 615                                 ac->state = AUTOCONN_INACTIVE;
 616                                 TAILQ_INSERT_TAIL(&autolist, ac, entry);
 617                         }
 618                         ac->stage = 1;
 619                 }
 620
 621                 /*
 622                  * Ignore the scan (and retry again) if the file was
 623                  * modified during the scan.
 624                  *
 625                  * Do not update the synchronized state.
 626                  */
 627                 if (fp) {
 628                         if (fstat(fileno(fp), &st) < 0) {
 629                                 fclose(fp);
 630                                 continue;
 631                         }
 632                         fclose(fp);
 633                         if (t != st.st_mtime)
 634                                 continue;
 635                 }
 636
 637                 /*
 638                  * Update the synchronized state and reconfigure the
 639                  * connect list as needed.
 640                  */
 641                 lmod = t;
 642                 next = TAILQ_FIRST(&autolist);
 643                 while ((ac = next) != NULL) {
 644                         next = TAILQ_NEXT(ac, entry);
 645
 646                         /*
 647                          * Staging, initiate
 648                          */
 649                         if (ac->stage && ac->state == AUTOCONN_INACTIVE) {
 650                                 if (pipe(ac->pipefd) == 0) {
 651                                         ac->stopme = 0;
 652                                         ac->state = AUTOCONN_ACTIVE;
 653                                         thread = NULL;
 654                                         pthread_create(&thread, NULL,
 655                                                        autoconn_connect_thread,
 656                                                        ac);
 657                                 }
 658                         }
 659
 660                         /*
 661                          * Unstaging, stop active connection.
 662                          *
 663                          * We write to the pipe which causes the iocom_core
 664                          * to call autoconn_disconnect_signal().
 665                          */
 666                         if (ac->stage == 0 &&
 667                             ac->state == AUTOCONN_ACTIVE) {
 668                                 if (ac->stopme == 0) {
 669                                         char dummy = 0;
 670                                         ac->stopme = 1;
 671                                         write(ac->pipefd[1], &dummy, 1);
 672                                 }
 673                         }
 674
 675                         /*
 676                          * Unstaging, delete inactive connection.
 677                          */
 678                         if (ac->stage == 0 &&
 679                             ac->state == AUTOCONN_INACTIVE) {
 680                                 TAILQ_REMOVE(&autolist, ac, entry);
 681                                 free(ac->host);
 682                                 free(ac);
 683                                 continue;
 684                         }
 685                 }
 686                 sleep(5);
 687         }
 688         return(NULL);
 689 }
 690
 691 static
 692 void *
 693 autoconn_connect_thread(void *data)
 694 {
 695         dmsg_master_service_info_t *info;
 696         struct autoconn *ac;
 697         void *res;
 698         int fd;
 699
 700         ac = data;
 701         pthread_detach(pthread_self());
 702
 703         while (ac->stopme == 0) {
 704                 fd = dmsg_connect(ac->host);
 705                 if (fd < 0) {
 706                         fprintf(stderr, "autoconn: Connect failure: %s\n",
 707                                 ac->host);
 708                         sleep(5);
 709                         continue;
 710                 }
 711                 fprintf(stderr, "autoconn: Connect %s\n", ac->host);
 712
 713                 info = malloc(sizeof(*info));
 714                 bzero(info, sizeof(*info));
 715                 info->fd = fd;
 716                 info->altfd = ac->pipefd[0];
 717                 info->altmsg_callback = autoconn_disconnect_signal;
 718                 info->usrmsg_callback = hammer2_usrmsg_handler;
 719                 info->detachme = 0;
 720                 info->noclosealt = 1;
 721                 pthread_create(&ac->thread, NULL, dmsg_master_service, info);
 722                 pthread_join(ac->thread, &res);
 723         }
 724         close(ac->pipefd[0]);
 725         ac->state = AUTOCONN_INACTIVE;
 726         /* auto structure can be ripped out here */
 727         return(NULL);
 728 }
 729
 730 static
 731 void
 732 autoconn_disconnect_signal(dmsg_iocom_t *iocom)
 733 {
 734         fprintf(stderr, "autoconn: Shutting down socket\n");
 735         atomic_set_int(&iocom->flags, DMSG_IOCOMF_EOF);
 736 }
 737
 738 /*
 739  * Retrieve the list of disk attachments and attempt to export
 740  * them.
 741  */
 742 static
 743 void
 744 udev_check_disks(void)
 745 {
 746         char tmpbuf[1024];
 747         char *buf = NULL;
 748         char *disk;
 749         int error;
 750         size_t n;
 751
 752         for (;;) {
 753                 n = 0;
 754                 error = sysctlbyname("kern.disks", NULL, &n, NULL, 0);
 755                 if (error < 0 || n == 0)
 756                         break;
 757                 if (n >= sizeof(tmpbuf))
 758                         buf = malloc(n + 1);
 759                 else
 760                         buf = tmpbuf;
 761                 error = sysctlbyname("kern.disks", buf, &n, NULL, 0);
 762                 if (error == 0) {
 763                         buf[n] = 0;
 764                         break;
 765                 }
 766                 if (buf != tmpbuf) {
 767                         free(buf);
 768                         buf = NULL;
 769                 }
 770                 if (errno != ENOMEM)
 771                         break;
 772         }
 773         if (buf) {
 774                 fprintf(stderr, "DISKS: %s\n", buf);
 775                 for (disk = strtok(buf, WS); disk; disk = strtok(NULL, WS)) {
 776                         disk_reconnect(disk);
 777                 }
 778                 if (buf != tmpbuf)
 779                         free(buf);
 780         }
 781 }
 782
 783 /*
 784  * Normally the mount program supplies a cluster communications
 785  * descriptor to the hammer2 vfs on mount, but if you kill the service
 786  * daemon and restart it that link will be lost.
 787  *
 788  * This procedure attempts to [re]connect to existing mounts when
 789  * the service daemon is started up before going into its accept
 790  * loop.
 791  *
 792  * NOTE: A hammer2 mount point can only accomodate one connection at a time
 793  *       so this will disconnect any existing connection during the
 794  *       reconnect.
 795  */
 796 static
 797 void
 798 master_reconnect(const char *mntpt)
 799 {
 800         struct hammer2_ioc_recluster recls;
 801         dmsg_master_service_info_t *info;
 802         pthread_t thread;
 803         int fd;
 804         int pipefds[2];
 805
 806         fd = open(mntpt, O_RDONLY);
 807         if (fd < 0) {
 808                 fprintf(stderr, "reconnect %s: no access to mount\n", mntpt);
 809                 return;
 810         }
 811         if (pipe(pipefds) < 0) {
 812                 fprintf(stderr, "reconnect %s: pipe() failed\n", mntpt);
 813                 close(fd);
 814                 return;
 815         }
 816         bzero(&recls, sizeof(recls));
 817         recls.fd = pipefds[0];
 818         if (ioctl(fd, HAMMER2IOC_RECLUSTER, &recls) < 0) {
 819                 fprintf(stderr, "reconnect %s: ioctl failed\n", mntpt);
 820                 close(pipefds[0]);
 821                 close(pipefds[1]);
 822                 close(fd);
 823                 return;
 824         }
 825         close(pipefds[0]);
 826         close(fd);
 827
 828         info = malloc(sizeof(*info));
 829         bzero(info, sizeof(*info));
 830         info->fd = pipefds[1];
 831         info->detachme = 1;
 832         info->usrmsg_callback = hammer2_usrmsg_handler;
 833         info->label = strdup("hammer2");
 834         pthread_create(&thread, NULL, dmsg_master_service, info);
 835 }
 836
 837 /*
 838  * Reconnect a physical disk service to the mesh.
 839  */
 840 static
 841 void
 842 disk_reconnect(const char *disk)
 843 {
 844         struct disk_ioc_recluster recls;
 845         struct diskcon *dc;
 846         dmsg_master_service_info_t *info;
 847         pthread_t thread;
 848         int fd;
 849         int pipefds[2];
 850         char *path;
 851
 852         /*
 853          * Urm, this will auto-create mdX+1, just ignore for now.
 854          * This mechanic needs to be fixed.  It might actually be nice
 855          * to be able to export md disks.
 856          */
 857         if (strncmp(disk, "md", 2) == 0)
 858                 return;
 859         if (strncmp(disk, "xa", 2) == 0)
 860                 return;
 861
 862         /*
 863          * Check if already connected
 864          */
 865         pthread_mutex_lock(&diskmtx);
 866         TAILQ_FOREACH(dc, &diskconq, entry) {
 867                 if (strcmp(dc->disk, disk) == 0)
 868                         break;
 869         }
 870         pthread_mutex_unlock(&diskmtx);
 871         if (dc)
 872                 return;
 873
 874         /*
 875          * Not already connected, create a connection to the kernel
 876          * disk driver.
 877          */
 878         asprintf(&path, "/dev/%s", disk);
 879         fd = open(path, O_RDONLY);
 880         if (fd < 0) {
 881                 fprintf(stderr, "reconnect %s: no access to disk\n", disk);
 882                 free(path);
 883                 return;
 884         }
 885         free(path);
 886         if (pipe(pipefds) < 0) {
 887                 fprintf(stderr, "reconnect %s: pipe() failed\n", disk);
 888                 close(fd);
 889                 return;
 890         }
 891         bzero(&recls, sizeof(recls));
 892         recls.fd = pipefds[0];
 893         if (ioctl(fd, DIOCRECLUSTER, &recls) < 0) {
 894                 fprintf(stderr, "reconnect %s: ioctl failed\n", disk);
 895                 close(pipefds[0]);
 896                 close(pipefds[1]);
 897                 close(fd);
 898                 return;
 899         }
 900         close(pipefds[0]);
 901         close(fd);
 902
 903         dc = malloc(sizeof(*dc));
 904         dc->disk = strdup(disk);
 905         pthread_mutex_lock(&diskmtx);
 906         TAILQ_INSERT_TAIL(&diskconq, dc, entry);
 907         pthread_mutex_unlock(&diskmtx);
 908
 909         info = malloc(sizeof(*info));
 910         bzero(info, sizeof(*info));
 911         info->fd = pipefds[1];
 912         info->detachme = 1;
 913         info->usrmsg_callback = hammer2_usrmsg_handler;
 914         info->exit_callback = disk_disconnect;
 915         info->handle = dc;
 916         info->label = strdup(dc->disk);
 917         pthread_create(&thread, NULL, dmsg_master_service, info);
 918 }
 919
 920 static
 921 void
 922 disk_disconnect(void *handle)
 923 {
 924         struct diskcon *dc = handle;
 925
 926         fprintf(stderr, "DISK_DISCONNECT %s\n", dc->disk);
 927
 928         pthread_mutex_lock(&diskmtx);
 929         TAILQ_REMOVE(&diskconq, dc, entry);
 930         pthread_mutex_unlock(&diskmtx);
 931         free(dc->disk);
 932         free(dc);
 933 }
 934
 935 /*
 936  * Connect our cluster controller to /dev/xdisk.  xdisk will pick up
 937  * SPAN messages that we route to it, makes remote block devices
 938  * available to the host, and can issue dmsg transactions based on
 939  * device requests.
 940  */
 941 static
 942 void
 943 xdisk_connect(void)
 944 {
 945         dmsg_master_service_info_t *info;
 946         struct xdisk_attach_ioctl xaioc;
 947         pthread_t thread;
 948         int pipefds[2];
 949         int xfd;
 950         int error;
 951
 952         /*
 953          * Is /dev/xdisk available?
 954          */
 955         xfd = open("/dev/xdisk", O_RDWR, 0600);
 956         if (xfd < 0) {
 957                 fprintf(stderr, "xdisk_connect: Unable to open /dev/xdisk\n");
 958                 return;
 959         }
 960
 961         if (pipe(pipefds) < 0) {
 962                 fprintf(stderr, "xdisk_connect: pipe() failed\n");
 963                 return;
 964         }
 965
 966         /*
 967          * Pipe between cluster controller (this user process).
 968          */
 969         info = malloc(sizeof(*info));
 970         bzero(info, sizeof(*info));
 971         info->fd = pipefds[1];
 972         info->detachme = 1;
 973         info->usrmsg_callback = hammer2_usrmsg_handler;
 974         info->exit_callback = NULL;
 975         pthread_create(&thread, NULL, dmsg_master_service, info);
 976
 977         /*
 978          * And the xdisk device.
 979          */
 980         bzero(&xaioc, sizeof(xaioc));
 981         xaioc.fd = pipefds[0];
 982         error = ioctl(xfd, XDISKIOCATTACH, &xaioc);
 983         close(pipefds[0]);
 984         close(xfd);
 985
 986         if (error < 0) {
 987                 fprintf(stderr,
 988                         "xdisk_connect: cannot attach %s\n",
 989                         strerror(errno));
 990                 return;
 991         }
 992 }