primary.c revision 216478
1/*- 2 * Copyright (c) 2009 The FreeBSD Foundation 3 * Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 4 * All rights reserved. 5 * 6 * This software was developed by Pawel Jakub Dawidek under sponsorship from 7 * the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 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 the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: head/sbin/hastd/primary.c 216478 2010-12-16 07:29:58Z pjd $"); 33 34#include <sys/types.h> 35#include <sys/time.h> 36#include <sys/bio.h> 37#include <sys/disk.h> 38#include <sys/refcount.h> 39#include <sys/stat.h> 40 41#include <geom/gate/g_gate.h> 42 43#include <assert.h> 44#include <err.h> 45#include <errno.h> 46#include <fcntl.h> 47#include <libgeom.h> 48#include <pthread.h> 49#include <signal.h> 50#include <stdint.h> 51#include <stdio.h> 52#include <string.h> 53#include <sysexits.h> 54#include <unistd.h> 55 56#include <activemap.h> 57#include <nv.h> 58#include <rangelock.h> 59 60#include "control.h" 61#include "event.h" 62#include "hast.h" 63#include "hast_proto.h" 64#include "hastd.h" 65#include "hooks.h" 66#include "metadata.h" 67#include "proto.h" 68#include "pjdlog.h" 69#include "subr.h" 70#include "synch.h" 71 72/* The is only one remote component for now. */ 73#define ISREMOTE(no) ((no) == 1) 74 75struct hio { 76 /* 77 * Number of components we are still waiting for. 78 * When this field goes to 0, we can send the request back to the 79 * kernel. Each component has to decrease this counter by one 80 * even on failure. 81 */ 82 unsigned int hio_countdown; 83 /* 84 * Each component has a place to store its own error. 85 * Once the request is handled by all components we can decide if the 86 * request overall is successful or not. 87 */ 88 int *hio_errors; 89 /* 90 * Structure used to comunicate with GEOM Gate class. 91 */ 92 struct g_gate_ctl_io hio_ggio; 93 TAILQ_ENTRY(hio) *hio_next; 94}; 95#define hio_free_next hio_next[0] 96#define hio_done_next hio_next[0] 97 98/* 99 * Free list holds unused structures. When free list is empty, we have to wait 100 * until some in-progress requests are freed. 101 */ 102static TAILQ_HEAD(, hio) hio_free_list; 103static pthread_mutex_t hio_free_list_lock; 104static pthread_cond_t hio_free_list_cond; 105/* 106 * There is one send list for every component. One requests is placed on all 107 * send lists - each component gets the same request, but each component is 108 * responsible for managing his own send list. 109 */ 110static TAILQ_HEAD(, hio) *hio_send_list; 111static pthread_mutex_t *hio_send_list_lock; 112static pthread_cond_t *hio_send_list_cond; 113/* 114 * There is one recv list for every component, although local components don't 115 * use recv lists as local requests are done synchronously. 116 */ 117static TAILQ_HEAD(, hio) *hio_recv_list; 118static pthread_mutex_t *hio_recv_list_lock; 119static pthread_cond_t *hio_recv_list_cond; 120/* 121 * Request is placed on done list by the slowest component (the one that 122 * decreased hio_countdown from 1 to 0). 123 */ 124static TAILQ_HEAD(, hio) hio_done_list; 125static pthread_mutex_t hio_done_list_lock; 126static pthread_cond_t hio_done_list_cond; 127/* 128 * Structure below are for interaction with sync thread. 129 */ 130static bool sync_inprogress; 131static pthread_mutex_t sync_lock; 132static pthread_cond_t sync_cond; 133/* 134 * The lock below allows to synchornize access to remote connections. 135 */ 136static pthread_rwlock_t *hio_remote_lock; 137 138/* 139 * Lock to synchronize metadata updates. Also synchronize access to 140 * hr_primary_localcnt and hr_primary_remotecnt fields. 141 */ 142static pthread_mutex_t metadata_lock; 143 144/* 145 * Maximum number of outstanding I/O requests. 146 */ 147#define HAST_HIO_MAX 256 148/* 149 * Number of components. At this point there are only two components: local 150 * and remote, but in the future it might be possible to use multiple local 151 * and remote components. 152 */ 153#define HAST_NCOMPONENTS 2 154/* 155 * Number of seconds to sleep between reconnect retries or keepalive packets. 156 */ 157#define RETRY_SLEEP 10 158 159#define ISCONNECTED(res, no) \ 160 ((res)->hr_remotein != NULL && (res)->hr_remoteout != NULL) 161 162#define QUEUE_INSERT1(hio, name, ncomp) do { \ 163 bool _wakeup; \ 164 \ 165 mtx_lock(&hio_##name##_list_lock[(ncomp)]); \ 166 _wakeup = TAILQ_EMPTY(&hio_##name##_list[(ncomp)]); \ 167 TAILQ_INSERT_TAIL(&hio_##name##_list[(ncomp)], (hio), \ 168 hio_next[(ncomp)]); \ 169 mtx_unlock(&hio_##name##_list_lock[ncomp]); \ 170 if (_wakeup) \ 171 cv_signal(&hio_##name##_list_cond[(ncomp)]); \ 172} while (0) 173#define QUEUE_INSERT2(hio, name) do { \ 174 bool _wakeup; \ 175 \ 176 mtx_lock(&hio_##name##_list_lock); \ 177 _wakeup = TAILQ_EMPTY(&hio_##name##_list); \ 178 TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_##name##_next);\ 179 mtx_unlock(&hio_##name##_list_lock); \ 180 if (_wakeup) \ 181 cv_signal(&hio_##name##_list_cond); \ 182} while (0) 183#define QUEUE_TAKE1(hio, name, ncomp, timeout) do { \ 184 bool _last; \ 185 \ 186 mtx_lock(&hio_##name##_list_lock[(ncomp)]); \ 187 _last = false; \ 188 while (((hio) = TAILQ_FIRST(&hio_##name##_list[(ncomp)])) == NULL && !_last) { \ 189 cv_timedwait(&hio_##name##_list_cond[(ncomp)], \ 190 &hio_##name##_list_lock[(ncomp)], (timeout)); \ 191 if ((timeout) != 0) \ 192 _last = true; \ 193 } \ 194 if (hio != NULL) { \ 195 TAILQ_REMOVE(&hio_##name##_list[(ncomp)], (hio), \ 196 hio_next[(ncomp)]); \ 197 } \ 198 mtx_unlock(&hio_##name##_list_lock[(ncomp)]); \ 199} while (0) 200#define QUEUE_TAKE2(hio, name) do { \ 201 mtx_lock(&hio_##name##_list_lock); \ 202 while (((hio) = TAILQ_FIRST(&hio_##name##_list)) == NULL) { \ 203 cv_wait(&hio_##name##_list_cond, \ 204 &hio_##name##_list_lock); \ 205 } \ 206 TAILQ_REMOVE(&hio_##name##_list, (hio), hio_##name##_next); \ 207 mtx_unlock(&hio_##name##_list_lock); \ 208} while (0) 209 210#define SYNCREQ(hio) do { \ 211 (hio)->hio_ggio.gctl_unit = -1; \ 212 (hio)->hio_ggio.gctl_seq = 1; \ 213} while (0) 214#define ISSYNCREQ(hio) ((hio)->hio_ggio.gctl_unit == -1) 215#define SYNCREQDONE(hio) do { (hio)->hio_ggio.gctl_unit = -2; } while (0) 216#define ISSYNCREQDONE(hio) ((hio)->hio_ggio.gctl_unit == -2) 217 218static struct hast_resource *gres; 219 220static pthread_mutex_t range_lock; 221static struct rangelocks *range_regular; 222static bool range_regular_wait; 223static pthread_cond_t range_regular_cond; 224static struct rangelocks *range_sync; 225static bool range_sync_wait; 226static pthread_cond_t range_sync_cond; 227 228static void *ggate_recv_thread(void *arg); 229static void *local_send_thread(void *arg); 230static void *remote_send_thread(void *arg); 231static void *remote_recv_thread(void *arg); 232static void *ggate_send_thread(void *arg); 233static void *sync_thread(void *arg); 234static void *guard_thread(void *arg); 235 236static void 237cleanup(struct hast_resource *res) 238{ 239 int rerrno; 240 241 /* Remember errno. */ 242 rerrno = errno; 243 244 /* Destroy ggate provider if we created one. */ 245 if (res->hr_ggateunit >= 0) { 246 struct g_gate_ctl_destroy ggiod; 247 248 bzero(&ggiod, sizeof(ggiod)); 249 ggiod.gctl_version = G_GATE_VERSION; 250 ggiod.gctl_unit = res->hr_ggateunit; 251 ggiod.gctl_force = 1; 252 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DESTROY, &ggiod) < 0) { 253 pjdlog_errno(LOG_WARNING, 254 "Unable to destroy hast/%s device", 255 res->hr_provname); 256 } 257 res->hr_ggateunit = -1; 258 } 259 260 /* Restore errno. */ 261 errno = rerrno; 262} 263 264static __dead2 void 265primary_exit(int exitcode, const char *fmt, ...) 266{ 267 va_list ap; 268 269 assert(exitcode != EX_OK); 270 va_start(ap, fmt); 271 pjdlogv_errno(LOG_ERR, fmt, ap); 272 va_end(ap); 273 cleanup(gres); 274 exit(exitcode); 275} 276 277static __dead2 void 278primary_exitx(int exitcode, const char *fmt, ...) 279{ 280 va_list ap; 281 282 va_start(ap, fmt); 283 pjdlogv(exitcode == EX_OK ? LOG_INFO : LOG_ERR, fmt, ap); 284 va_end(ap); 285 cleanup(gres); 286 exit(exitcode); 287} 288 289static int 290hast_activemap_flush(struct hast_resource *res) 291{ 292 const unsigned char *buf; 293 size_t size; 294 295 buf = activemap_bitmap(res->hr_amp, &size); 296 assert(buf != NULL); 297 assert((size % res->hr_local_sectorsize) == 0); 298 if (pwrite(res->hr_localfd, buf, size, METADATA_SIZE) != 299 (ssize_t)size) { 300 KEEP_ERRNO(pjdlog_errno(LOG_ERR, 301 "Unable to flush activemap to disk")); 302 return (-1); 303 } 304 return (0); 305} 306 307static bool 308real_remote(const struct hast_resource *res) 309{ 310 311 return (strcmp(res->hr_remoteaddr, "none") != 0); 312} 313 314static void 315init_environment(struct hast_resource *res __unused) 316{ 317 struct hio *hio; 318 unsigned int ii, ncomps; 319 320 /* 321 * In the future it might be per-resource value. 322 */ 323 ncomps = HAST_NCOMPONENTS; 324 325 /* 326 * Allocate memory needed by lists. 327 */ 328 hio_send_list = malloc(sizeof(hio_send_list[0]) * ncomps); 329 if (hio_send_list == NULL) { 330 primary_exitx(EX_TEMPFAIL, 331 "Unable to allocate %zu bytes of memory for send lists.", 332 sizeof(hio_send_list[0]) * ncomps); 333 } 334 hio_send_list_lock = malloc(sizeof(hio_send_list_lock[0]) * ncomps); 335 if (hio_send_list_lock == NULL) { 336 primary_exitx(EX_TEMPFAIL, 337 "Unable to allocate %zu bytes of memory for send list locks.", 338 sizeof(hio_send_list_lock[0]) * ncomps); 339 } 340 hio_send_list_cond = malloc(sizeof(hio_send_list_cond[0]) * ncomps); 341 if (hio_send_list_cond == NULL) { 342 primary_exitx(EX_TEMPFAIL, 343 "Unable to allocate %zu bytes of memory for send list condition variables.", 344 sizeof(hio_send_list_cond[0]) * ncomps); 345 } 346 hio_recv_list = malloc(sizeof(hio_recv_list[0]) * ncomps); 347 if (hio_recv_list == NULL) { 348 primary_exitx(EX_TEMPFAIL, 349 "Unable to allocate %zu bytes of memory for recv lists.", 350 sizeof(hio_recv_list[0]) * ncomps); 351 } 352 hio_recv_list_lock = malloc(sizeof(hio_recv_list_lock[0]) * ncomps); 353 if (hio_recv_list_lock == NULL) { 354 primary_exitx(EX_TEMPFAIL, 355 "Unable to allocate %zu bytes of memory for recv list locks.", 356 sizeof(hio_recv_list_lock[0]) * ncomps); 357 } 358 hio_recv_list_cond = malloc(sizeof(hio_recv_list_cond[0]) * ncomps); 359 if (hio_recv_list_cond == NULL) { 360 primary_exitx(EX_TEMPFAIL, 361 "Unable to allocate %zu bytes of memory for recv list condition variables.", 362 sizeof(hio_recv_list_cond[0]) * ncomps); 363 } 364 hio_remote_lock = malloc(sizeof(hio_remote_lock[0]) * ncomps); 365 if (hio_remote_lock == NULL) { 366 primary_exitx(EX_TEMPFAIL, 367 "Unable to allocate %zu bytes of memory for remote connections locks.", 368 sizeof(hio_remote_lock[0]) * ncomps); 369 } 370 371 /* 372 * Initialize lists, their locks and theirs condition variables. 373 */ 374 TAILQ_INIT(&hio_free_list); 375 mtx_init(&hio_free_list_lock); 376 cv_init(&hio_free_list_cond); 377 for (ii = 0; ii < HAST_NCOMPONENTS; ii++) { 378 TAILQ_INIT(&hio_send_list[ii]); 379 mtx_init(&hio_send_list_lock[ii]); 380 cv_init(&hio_send_list_cond[ii]); 381 TAILQ_INIT(&hio_recv_list[ii]); 382 mtx_init(&hio_recv_list_lock[ii]); 383 cv_init(&hio_recv_list_cond[ii]); 384 rw_init(&hio_remote_lock[ii]); 385 } 386 TAILQ_INIT(&hio_done_list); 387 mtx_init(&hio_done_list_lock); 388 cv_init(&hio_done_list_cond); 389 mtx_init(&metadata_lock); 390 391 /* 392 * Allocate requests pool and initialize requests. 393 */ 394 for (ii = 0; ii < HAST_HIO_MAX; ii++) { 395 hio = malloc(sizeof(*hio)); 396 if (hio == NULL) { 397 primary_exitx(EX_TEMPFAIL, 398 "Unable to allocate %zu bytes of memory for hio request.", 399 sizeof(*hio)); 400 } 401 hio->hio_countdown = 0; 402 hio->hio_errors = malloc(sizeof(hio->hio_errors[0]) * ncomps); 403 if (hio->hio_errors == NULL) { 404 primary_exitx(EX_TEMPFAIL, 405 "Unable allocate %zu bytes of memory for hio errors.", 406 sizeof(hio->hio_errors[0]) * ncomps); 407 } 408 hio->hio_next = malloc(sizeof(hio->hio_next[0]) * ncomps); 409 if (hio->hio_next == NULL) { 410 primary_exitx(EX_TEMPFAIL, 411 "Unable allocate %zu bytes of memory for hio_next field.", 412 sizeof(hio->hio_next[0]) * ncomps); 413 } 414 hio->hio_ggio.gctl_version = G_GATE_VERSION; 415 hio->hio_ggio.gctl_data = malloc(MAXPHYS); 416 if (hio->hio_ggio.gctl_data == NULL) { 417 primary_exitx(EX_TEMPFAIL, 418 "Unable to allocate %zu bytes of memory for gctl_data.", 419 MAXPHYS); 420 } 421 hio->hio_ggio.gctl_length = MAXPHYS; 422 hio->hio_ggio.gctl_error = 0; 423 TAILQ_INSERT_HEAD(&hio_free_list, hio, hio_free_next); 424 } 425} 426 427static bool 428init_resuid(struct hast_resource *res) 429{ 430 431 mtx_lock(&metadata_lock); 432 if (res->hr_resuid != 0) { 433 mtx_unlock(&metadata_lock); 434 return (false); 435 } else { 436 /* Initialize unique resource identifier. */ 437 arc4random_buf(&res->hr_resuid, sizeof(res->hr_resuid)); 438 mtx_unlock(&metadata_lock); 439 if (metadata_write(res) < 0) 440 exit(EX_NOINPUT); 441 return (true); 442 } 443} 444 445static void 446init_local(struct hast_resource *res) 447{ 448 unsigned char *buf; 449 size_t mapsize; 450 451 if (metadata_read(res, true) < 0) 452 exit(EX_NOINPUT); 453 mtx_init(&res->hr_amp_lock); 454 if (activemap_init(&res->hr_amp, res->hr_datasize, res->hr_extentsize, 455 res->hr_local_sectorsize, res->hr_keepdirty) < 0) { 456 primary_exit(EX_TEMPFAIL, "Unable to create activemap"); 457 } 458 mtx_init(&range_lock); 459 cv_init(&range_regular_cond); 460 if (rangelock_init(&range_regular) < 0) 461 primary_exit(EX_TEMPFAIL, "Unable to create regular range lock"); 462 cv_init(&range_sync_cond); 463 if (rangelock_init(&range_sync) < 0) 464 primary_exit(EX_TEMPFAIL, "Unable to create sync range lock"); 465 mapsize = activemap_ondisk_size(res->hr_amp); 466 buf = calloc(1, mapsize); 467 if (buf == NULL) { 468 primary_exitx(EX_TEMPFAIL, 469 "Unable to allocate buffer for activemap."); 470 } 471 if (pread(res->hr_localfd, buf, mapsize, METADATA_SIZE) != 472 (ssize_t)mapsize) { 473 primary_exit(EX_NOINPUT, "Unable to read activemap"); 474 } 475 activemap_copyin(res->hr_amp, buf, mapsize); 476 free(buf); 477 if (res->hr_resuid != 0) 478 return; 479 /* 480 * We're using provider for the first time. Initialize local and remote 481 * counters. We don't initialize resuid here, as we want to do it just 482 * in time. The reason for this is that we want to inform secondary 483 * that there were no writes yet, so there is no need to synchronize 484 * anything. 485 */ 486 res->hr_primary_localcnt = 1; 487 res->hr_primary_remotecnt = 0; 488 if (metadata_write(res) < 0) 489 exit(EX_NOINPUT); 490} 491 492static bool 493init_remote(struct hast_resource *res, struct proto_conn **inp, 494 struct proto_conn **outp) 495{ 496 struct proto_conn *in, *out; 497 struct nv *nvout, *nvin; 498 const unsigned char *token; 499 unsigned char *map; 500 const char *errmsg; 501 int32_t extentsize; 502 int64_t datasize; 503 uint32_t mapsize; 504 size_t size; 505 506 assert((inp == NULL && outp == NULL) || (inp != NULL && outp != NULL)); 507 assert(real_remote(res)); 508 509 in = out = NULL; 510 errmsg = NULL; 511 512 /* Prepare outgoing connection with remote node. */ 513 if (proto_client(res->hr_remoteaddr, &out) < 0) { 514 primary_exit(EX_TEMPFAIL, 515 "Unable to create outgoing connection to %s", 516 res->hr_remoteaddr); 517 } 518 /* Try to connect, but accept failure. */ 519 if (proto_connect(out) < 0) { 520 pjdlog_errno(LOG_WARNING, "Unable to connect to %s", 521 res->hr_remoteaddr); 522 goto close; 523 } 524 /* Error in setting timeout is not critical, but why should it fail? */ 525 if (proto_timeout(out, res->hr_timeout) < 0) 526 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 527 /* 528 * First handshake step. 529 * Setup outgoing connection with remote node. 530 */ 531 nvout = nv_alloc(); 532 nv_add_string(nvout, res->hr_name, "resource"); 533 if (nv_error(nvout) != 0) { 534 pjdlog_common(LOG_WARNING, 0, nv_error(nvout), 535 "Unable to allocate header for connection with %s", 536 res->hr_remoteaddr); 537 nv_free(nvout); 538 goto close; 539 } 540 if (hast_proto_send(res, out, nvout, NULL, 0) < 0) { 541 pjdlog_errno(LOG_WARNING, 542 "Unable to send handshake header to %s", 543 res->hr_remoteaddr); 544 nv_free(nvout); 545 goto close; 546 } 547 nv_free(nvout); 548 if (hast_proto_recv_hdr(out, &nvin) < 0) { 549 pjdlog_errno(LOG_WARNING, 550 "Unable to receive handshake header from %s", 551 res->hr_remoteaddr); 552 goto close; 553 } 554 errmsg = nv_get_string(nvin, "errmsg"); 555 if (errmsg != NULL) { 556 pjdlog_warning("%s", errmsg); 557 nv_free(nvin); 558 goto close; 559 } 560 token = nv_get_uint8_array(nvin, &size, "token"); 561 if (token == NULL) { 562 pjdlog_warning("Handshake header from %s has no 'token' field.", 563 res->hr_remoteaddr); 564 nv_free(nvin); 565 goto close; 566 } 567 if (size != sizeof(res->hr_token)) { 568 pjdlog_warning("Handshake header from %s contains 'token' of wrong size (got %zu, expected %zu).", 569 res->hr_remoteaddr, size, sizeof(res->hr_token)); 570 nv_free(nvin); 571 goto close; 572 } 573 bcopy(token, res->hr_token, sizeof(res->hr_token)); 574 nv_free(nvin); 575 576 /* 577 * Second handshake step. 578 * Setup incoming connection with remote node. 579 */ 580 if (proto_client(res->hr_remoteaddr, &in) < 0) { 581 primary_exit(EX_TEMPFAIL, 582 "Unable to create incoming connection to %s", 583 res->hr_remoteaddr); 584 } 585 /* Try to connect, but accept failure. */ 586 if (proto_connect(in) < 0) { 587 pjdlog_errno(LOG_WARNING, "Unable to connect to %s", 588 res->hr_remoteaddr); 589 goto close; 590 } 591 /* Error in setting timeout is not critical, but why should it fail? */ 592 if (proto_timeout(in, res->hr_timeout) < 0) 593 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 594 nvout = nv_alloc(); 595 nv_add_string(nvout, res->hr_name, "resource"); 596 nv_add_uint8_array(nvout, res->hr_token, sizeof(res->hr_token), 597 "token"); 598 if (res->hr_resuid == 0) { 599 /* 600 * The resuid field was not yet initialized. 601 * Because we do synchronization inside init_resuid(), it is 602 * possible that someone already initialized it, the function 603 * will return false then, but if we successfully initialized 604 * it, we will get true. True means that there were no writes 605 * to this resource yet and we want to inform secondary that 606 * synchronization is not needed by sending "virgin" argument. 607 */ 608 if (init_resuid(res)) 609 nv_add_int8(nvout, 1, "virgin"); 610 } 611 nv_add_uint64(nvout, res->hr_resuid, "resuid"); 612 nv_add_uint64(nvout, res->hr_primary_localcnt, "localcnt"); 613 nv_add_uint64(nvout, res->hr_primary_remotecnt, "remotecnt"); 614 if (nv_error(nvout) != 0) { 615 pjdlog_common(LOG_WARNING, 0, nv_error(nvout), 616 "Unable to allocate header for connection with %s", 617 res->hr_remoteaddr); 618 nv_free(nvout); 619 goto close; 620 } 621 if (hast_proto_send(res, in, nvout, NULL, 0) < 0) { 622 pjdlog_errno(LOG_WARNING, 623 "Unable to send handshake header to %s", 624 res->hr_remoteaddr); 625 nv_free(nvout); 626 goto close; 627 } 628 nv_free(nvout); 629 if (hast_proto_recv_hdr(out, &nvin) < 0) { 630 pjdlog_errno(LOG_WARNING, 631 "Unable to receive handshake header from %s", 632 res->hr_remoteaddr); 633 goto close; 634 } 635 errmsg = nv_get_string(nvin, "errmsg"); 636 if (errmsg != NULL) { 637 pjdlog_warning("%s", errmsg); 638 nv_free(nvin); 639 goto close; 640 } 641 datasize = nv_get_int64(nvin, "datasize"); 642 if (datasize != res->hr_datasize) { 643 pjdlog_warning("Data size differs between nodes (local=%jd, remote=%jd).", 644 (intmax_t)res->hr_datasize, (intmax_t)datasize); 645 nv_free(nvin); 646 goto close; 647 } 648 extentsize = nv_get_int32(nvin, "extentsize"); 649 if (extentsize != res->hr_extentsize) { 650 pjdlog_warning("Extent size differs between nodes (local=%zd, remote=%zd).", 651 (ssize_t)res->hr_extentsize, (ssize_t)extentsize); 652 nv_free(nvin); 653 goto close; 654 } 655 res->hr_secondary_localcnt = nv_get_uint64(nvin, "localcnt"); 656 res->hr_secondary_remotecnt = nv_get_uint64(nvin, "remotecnt"); 657 res->hr_syncsrc = nv_get_uint8(nvin, "syncsrc"); 658 map = NULL; 659 mapsize = nv_get_uint32(nvin, "mapsize"); 660 if (mapsize > 0) { 661 map = malloc(mapsize); 662 if (map == NULL) { 663 pjdlog_error("Unable to allocate memory for remote activemap (mapsize=%ju).", 664 (uintmax_t)mapsize); 665 nv_free(nvin); 666 goto close; 667 } 668 /* 669 * Remote node have some dirty extents on its own, lets 670 * download its activemap. 671 */ 672 if (hast_proto_recv_data(res, out, nvin, map, 673 mapsize) < 0) { 674 pjdlog_errno(LOG_ERR, 675 "Unable to receive remote activemap"); 676 nv_free(nvin); 677 free(map); 678 goto close; 679 } 680 /* 681 * Merge local and remote bitmaps. 682 */ 683 activemap_merge(res->hr_amp, map, mapsize); 684 free(map); 685 /* 686 * Now that we merged bitmaps from both nodes, flush it to the 687 * disk before we start to synchronize. 688 */ 689 (void)hast_activemap_flush(res); 690 } 691 nv_free(nvin); 692 pjdlog_info("Connected to %s.", res->hr_remoteaddr); 693 if (inp != NULL && outp != NULL) { 694 *inp = in; 695 *outp = out; 696 } else { 697 res->hr_remotein = in; 698 res->hr_remoteout = out; 699 } 700 event_send(res, EVENT_CONNECT); 701 return (true); 702close: 703 if (errmsg != NULL && strcmp(errmsg, "Split-brain condition!") == 0) 704 event_send(res, EVENT_SPLITBRAIN); 705 proto_close(out); 706 if (in != NULL) 707 proto_close(in); 708 return (false); 709} 710 711static void 712sync_start(void) 713{ 714 715 mtx_lock(&sync_lock); 716 sync_inprogress = true; 717 mtx_unlock(&sync_lock); 718 cv_signal(&sync_cond); 719} 720 721static void 722sync_stop(void) 723{ 724 725 mtx_lock(&sync_lock); 726 if (sync_inprogress) 727 sync_inprogress = false; 728 mtx_unlock(&sync_lock); 729} 730 731static void 732init_ggate(struct hast_resource *res) 733{ 734 struct g_gate_ctl_create ggiocreate; 735 struct g_gate_ctl_cancel ggiocancel; 736 737 /* 738 * We communicate with ggate via /dev/ggctl. Open it. 739 */ 740 res->hr_ggatefd = open("/dev/" G_GATE_CTL_NAME, O_RDWR); 741 if (res->hr_ggatefd < 0) 742 primary_exit(EX_OSFILE, "Unable to open /dev/" G_GATE_CTL_NAME); 743 /* 744 * Create provider before trying to connect, as connection failure 745 * is not critical, but may take some time. 746 */ 747 bzero(&ggiocreate, sizeof(ggiocreate)); 748 ggiocreate.gctl_version = G_GATE_VERSION; 749 ggiocreate.gctl_mediasize = res->hr_datasize; 750 ggiocreate.gctl_sectorsize = res->hr_local_sectorsize; 751 ggiocreate.gctl_flags = 0; 752 ggiocreate.gctl_maxcount = G_GATE_MAX_QUEUE_SIZE; 753 ggiocreate.gctl_timeout = 0; 754 ggiocreate.gctl_unit = G_GATE_NAME_GIVEN; 755 snprintf(ggiocreate.gctl_name, sizeof(ggiocreate.gctl_name), "hast/%s", 756 res->hr_provname); 757 if (ioctl(res->hr_ggatefd, G_GATE_CMD_CREATE, &ggiocreate) == 0) { 758 pjdlog_info("Device hast/%s created.", res->hr_provname); 759 res->hr_ggateunit = ggiocreate.gctl_unit; 760 return; 761 } 762 if (errno != EEXIST) { 763 primary_exit(EX_OSERR, "Unable to create hast/%s device", 764 res->hr_provname); 765 } 766 pjdlog_debug(1, 767 "Device hast/%s already exists, we will try to take it over.", 768 res->hr_provname); 769 /* 770 * If we received EEXIST, we assume that the process who created the 771 * provider died and didn't clean up. In that case we will start from 772 * where he left of. 773 */ 774 bzero(&ggiocancel, sizeof(ggiocancel)); 775 ggiocancel.gctl_version = G_GATE_VERSION; 776 ggiocancel.gctl_unit = G_GATE_NAME_GIVEN; 777 snprintf(ggiocancel.gctl_name, sizeof(ggiocancel.gctl_name), "hast/%s", 778 res->hr_provname); 779 if (ioctl(res->hr_ggatefd, G_GATE_CMD_CANCEL, &ggiocancel) == 0) { 780 pjdlog_info("Device hast/%s recovered.", res->hr_provname); 781 res->hr_ggateunit = ggiocancel.gctl_unit; 782 return; 783 } 784 primary_exit(EX_OSERR, "Unable to take over hast/%s device", 785 res->hr_provname); 786} 787 788void 789hastd_primary(struct hast_resource *res) 790{ 791 pthread_t td; 792 pid_t pid; 793 int error; 794 795 /* 796 * Create communication channel between parent and child. 797 */ 798 if (proto_client("socketpair://", &res->hr_ctrl) < 0) { 799 KEEP_ERRNO((void)pidfile_remove(pfh)); 800 pjdlog_exit(EX_OSERR, 801 "Unable to create control sockets between parent and child"); 802 } 803 /* 804 * Create communication channel between child and parent. 805 */ 806 if (proto_client("socketpair://", &res->hr_event) < 0) { 807 KEEP_ERRNO((void)pidfile_remove(pfh)); 808 pjdlog_exit(EX_OSERR, 809 "Unable to create event sockets between child and parent"); 810 } 811 812 pid = fork(); 813 if (pid < 0) { 814 KEEP_ERRNO((void)pidfile_remove(pfh)); 815 pjdlog_exit(EX_TEMPFAIL, "Unable to fork"); 816 } 817 818 if (pid > 0) { 819 /* This is parent. */ 820 /* Declare that we are receiver. */ 821 proto_recv(res->hr_event, NULL, 0); 822 res->hr_workerpid = pid; 823 return; 824 } 825 826 gres = res; 827 828 (void)pidfile_close(pfh); 829 hook_fini(); 830 831 setproctitle("%s (primary)", res->hr_name); 832 833 /* Declare that we are sender. */ 834 proto_send(res->hr_event, NULL, 0); 835 836 init_local(res); 837 init_ggate(res); 838 init_environment(res); 839 /* 840 * Create the guard thread first, so we can handle signals from the 841 * very begining. 842 */ 843 error = pthread_create(&td, NULL, guard_thread, res); 844 assert(error == 0); 845 /* 846 * Create the control thread before sending any event to the parent, 847 * as we can deadlock when parent sends control request to worker, 848 * but worker has no control thread started yet, so parent waits. 849 * In the meantime worker sends an event to the parent, but parent 850 * is unable to handle the event, because it waits for control 851 * request response. 852 */ 853 error = pthread_create(&td, NULL, ctrl_thread, res); 854 assert(error == 0); 855 if (real_remote(res) && init_remote(res, NULL, NULL)) 856 sync_start(); 857 error = pthread_create(&td, NULL, ggate_recv_thread, res); 858 assert(error == 0); 859 error = pthread_create(&td, NULL, local_send_thread, res); 860 assert(error == 0); 861 error = pthread_create(&td, NULL, remote_send_thread, res); 862 assert(error == 0); 863 error = pthread_create(&td, NULL, remote_recv_thread, res); 864 assert(error == 0); 865 error = pthread_create(&td, NULL, ggate_send_thread, res); 866 assert(error == 0); 867 (void)sync_thread(res); 868} 869 870static void 871reqlog(int loglevel, int debuglevel, struct g_gate_ctl_io *ggio, const char *fmt, ...) 872{ 873 char msg[1024]; 874 va_list ap; 875 int len; 876 877 va_start(ap, fmt); 878 len = vsnprintf(msg, sizeof(msg), fmt, ap); 879 va_end(ap); 880 if ((size_t)len < sizeof(msg)) { 881 switch (ggio->gctl_cmd) { 882 case BIO_READ: 883 (void)snprintf(msg + len, sizeof(msg) - len, 884 "READ(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 885 (uintmax_t)ggio->gctl_length); 886 break; 887 case BIO_DELETE: 888 (void)snprintf(msg + len, sizeof(msg) - len, 889 "DELETE(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 890 (uintmax_t)ggio->gctl_length); 891 break; 892 case BIO_FLUSH: 893 (void)snprintf(msg + len, sizeof(msg) - len, "FLUSH."); 894 break; 895 case BIO_WRITE: 896 (void)snprintf(msg + len, sizeof(msg) - len, 897 "WRITE(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 898 (uintmax_t)ggio->gctl_length); 899 break; 900 default: 901 (void)snprintf(msg + len, sizeof(msg) - len, 902 "UNKNOWN(%u).", (unsigned int)ggio->gctl_cmd); 903 break; 904 } 905 } 906 pjdlog_common(loglevel, debuglevel, -1, "%s", msg); 907} 908 909static void 910remote_close(struct hast_resource *res, int ncomp) 911{ 912 913 rw_wlock(&hio_remote_lock[ncomp]); 914 /* 915 * A race is possible between dropping rlock and acquiring wlock - 916 * another thread can close connection in-between. 917 */ 918 if (!ISCONNECTED(res, ncomp)) { 919 assert(res->hr_remotein == NULL); 920 assert(res->hr_remoteout == NULL); 921 rw_unlock(&hio_remote_lock[ncomp]); 922 return; 923 } 924 925 assert(res->hr_remotein != NULL); 926 assert(res->hr_remoteout != NULL); 927 928 pjdlog_debug(2, "Closing incoming connection to %s.", 929 res->hr_remoteaddr); 930 proto_close(res->hr_remotein); 931 res->hr_remotein = NULL; 932 pjdlog_debug(2, "Closing outgoing connection to %s.", 933 res->hr_remoteaddr); 934 proto_close(res->hr_remoteout); 935 res->hr_remoteout = NULL; 936 937 rw_unlock(&hio_remote_lock[ncomp]); 938 939 pjdlog_warning("Disconnected from %s.", res->hr_remoteaddr); 940 941 /* 942 * Stop synchronization if in-progress. 943 */ 944 sync_stop(); 945 946 event_send(res, EVENT_DISCONNECT); 947} 948 949/* 950 * Thread receives ggate I/O requests from the kernel and passes them to 951 * appropriate threads: 952 * WRITE - always goes to both local_send and remote_send threads 953 * READ (when the block is up-to-date on local component) - 954 * only local_send thread 955 * READ (when the block isn't up-to-date on local component) - 956 * only remote_send thread 957 * DELETE - always goes to both local_send and remote_send threads 958 * FLUSH - always goes to both local_send and remote_send threads 959 */ 960static void * 961ggate_recv_thread(void *arg) 962{ 963 struct hast_resource *res = arg; 964 struct g_gate_ctl_io *ggio; 965 struct hio *hio; 966 unsigned int ii, ncomp, ncomps; 967 int error; 968 969 ncomps = HAST_NCOMPONENTS; 970 971 for (;;) { 972 pjdlog_debug(2, "ggate_recv: Taking free request."); 973 QUEUE_TAKE2(hio, free); 974 pjdlog_debug(2, "ggate_recv: (%p) Got free request.", hio); 975 ggio = &hio->hio_ggio; 976 ggio->gctl_unit = res->hr_ggateunit; 977 ggio->gctl_length = MAXPHYS; 978 ggio->gctl_error = 0; 979 pjdlog_debug(2, 980 "ggate_recv: (%p) Waiting for request from the kernel.", 981 hio); 982 if (ioctl(res->hr_ggatefd, G_GATE_CMD_START, ggio) < 0) { 983 if (sigexit_received) 984 pthread_exit(NULL); 985 primary_exit(EX_OSERR, "G_GATE_CMD_START failed"); 986 } 987 error = ggio->gctl_error; 988 switch (error) { 989 case 0: 990 break; 991 case ECANCELED: 992 /* Exit gracefully. */ 993 if (!sigexit_received) { 994 pjdlog_debug(2, 995 "ggate_recv: (%p) Received cancel from the kernel.", 996 hio); 997 pjdlog_info("Received cancel from the kernel, exiting."); 998 } 999 pthread_exit(NULL); 1000 case ENOMEM: 1001 /* 1002 * Buffer too small? Impossible, we allocate MAXPHYS 1003 * bytes - request can't be bigger than that. 1004 */ 1005 /* FALLTHROUGH */ 1006 case ENXIO: 1007 default: 1008 primary_exitx(EX_OSERR, "G_GATE_CMD_START failed: %s.", 1009 strerror(error)); 1010 } 1011 for (ii = 0; ii < ncomps; ii++) 1012 hio->hio_errors[ii] = EINVAL; 1013 reqlog(LOG_DEBUG, 2, ggio, 1014 "ggate_recv: (%p) Request received from the kernel: ", 1015 hio); 1016 /* 1017 * Inform all components about new write request. 1018 * For read request prefer local component unless the given 1019 * range is out-of-date, then use remote component. 1020 */ 1021 switch (ggio->gctl_cmd) { 1022 case BIO_READ: 1023 pjdlog_debug(2, 1024 "ggate_recv: (%p) Moving request to the send queue.", 1025 hio); 1026 refcount_init(&hio->hio_countdown, 1); 1027 mtx_lock(&metadata_lock); 1028 if (res->hr_syncsrc == HAST_SYNCSRC_UNDEF || 1029 res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1030 /* 1031 * This range is up-to-date on local component, 1032 * so handle request locally. 1033 */ 1034 /* Local component is 0 for now. */ 1035 ncomp = 0; 1036 } else /* if (res->hr_syncsrc == 1037 HAST_SYNCSRC_SECONDARY) */ { 1038 assert(res->hr_syncsrc == 1039 HAST_SYNCSRC_SECONDARY); 1040 /* 1041 * This range is out-of-date on local component, 1042 * so send request to the remote node. 1043 */ 1044 /* Remote component is 1 for now. */ 1045 ncomp = 1; 1046 } 1047 mtx_unlock(&metadata_lock); 1048 QUEUE_INSERT1(hio, send, ncomp); 1049 break; 1050 case BIO_WRITE: 1051 if (res->hr_resuid == 0) { 1052 /* This is first write, initialize resuid. */ 1053 (void)init_resuid(res); 1054 } 1055 for (;;) { 1056 mtx_lock(&range_lock); 1057 if (rangelock_islocked(range_sync, 1058 ggio->gctl_offset, ggio->gctl_length)) { 1059 pjdlog_debug(2, 1060 "regular: Range offset=%jd length=%zu locked.", 1061 (intmax_t)ggio->gctl_offset, 1062 (size_t)ggio->gctl_length); 1063 range_regular_wait = true; 1064 cv_wait(&range_regular_cond, &range_lock); 1065 range_regular_wait = false; 1066 mtx_unlock(&range_lock); 1067 continue; 1068 } 1069 if (rangelock_add(range_regular, 1070 ggio->gctl_offset, ggio->gctl_length) < 0) { 1071 mtx_unlock(&range_lock); 1072 pjdlog_debug(2, 1073 "regular: Range offset=%jd length=%zu is already locked, waiting.", 1074 (intmax_t)ggio->gctl_offset, 1075 (size_t)ggio->gctl_length); 1076 sleep(1); 1077 continue; 1078 } 1079 mtx_unlock(&range_lock); 1080 break; 1081 } 1082 mtx_lock(&res->hr_amp_lock); 1083 if (activemap_write_start(res->hr_amp, 1084 ggio->gctl_offset, ggio->gctl_length)) { 1085 (void)hast_activemap_flush(res); 1086 } 1087 mtx_unlock(&res->hr_amp_lock); 1088 /* FALLTHROUGH */ 1089 case BIO_DELETE: 1090 case BIO_FLUSH: 1091 pjdlog_debug(2, 1092 "ggate_recv: (%p) Moving request to the send queues.", 1093 hio); 1094 refcount_init(&hio->hio_countdown, ncomps); 1095 for (ii = 0; ii < ncomps; ii++) 1096 QUEUE_INSERT1(hio, send, ii); 1097 break; 1098 } 1099 } 1100 /* NOTREACHED */ 1101 return (NULL); 1102} 1103 1104/* 1105 * Thread reads from or writes to local component. 1106 * If local read fails, it redirects it to remote_send thread. 1107 */ 1108static void * 1109local_send_thread(void *arg) 1110{ 1111 struct hast_resource *res = arg; 1112 struct g_gate_ctl_io *ggio; 1113 struct hio *hio; 1114 unsigned int ncomp, rncomp; 1115 ssize_t ret; 1116 1117 /* Local component is 0 for now. */ 1118 ncomp = 0; 1119 /* Remote component is 1 for now. */ 1120 rncomp = 1; 1121 1122 for (;;) { 1123 pjdlog_debug(2, "local_send: Taking request."); 1124 QUEUE_TAKE1(hio, send, ncomp, 0); 1125 pjdlog_debug(2, "local_send: (%p) Got request.", hio); 1126 ggio = &hio->hio_ggio; 1127 switch (ggio->gctl_cmd) { 1128 case BIO_READ: 1129 ret = pread(res->hr_localfd, ggio->gctl_data, 1130 ggio->gctl_length, 1131 ggio->gctl_offset + res->hr_localoff); 1132 if (ret == ggio->gctl_length) 1133 hio->hio_errors[ncomp] = 0; 1134 else { 1135 /* 1136 * If READ failed, try to read from remote node. 1137 */ 1138 QUEUE_INSERT1(hio, send, rncomp); 1139 continue; 1140 } 1141 break; 1142 case BIO_WRITE: 1143 ret = pwrite(res->hr_localfd, ggio->gctl_data, 1144 ggio->gctl_length, 1145 ggio->gctl_offset + res->hr_localoff); 1146 if (ret < 0) 1147 hio->hio_errors[ncomp] = errno; 1148 else if (ret != ggio->gctl_length) 1149 hio->hio_errors[ncomp] = EIO; 1150 else 1151 hio->hio_errors[ncomp] = 0; 1152 break; 1153 case BIO_DELETE: 1154 ret = g_delete(res->hr_localfd, 1155 ggio->gctl_offset + res->hr_localoff, 1156 ggio->gctl_length); 1157 if (ret < 0) 1158 hio->hio_errors[ncomp] = errno; 1159 else 1160 hio->hio_errors[ncomp] = 0; 1161 break; 1162 case BIO_FLUSH: 1163 ret = g_flush(res->hr_localfd); 1164 if (ret < 0) 1165 hio->hio_errors[ncomp] = errno; 1166 else 1167 hio->hio_errors[ncomp] = 0; 1168 break; 1169 } 1170 if (refcount_release(&hio->hio_countdown)) { 1171 if (ISSYNCREQ(hio)) { 1172 mtx_lock(&sync_lock); 1173 SYNCREQDONE(hio); 1174 mtx_unlock(&sync_lock); 1175 cv_signal(&sync_cond); 1176 } else { 1177 pjdlog_debug(2, 1178 "local_send: (%p) Moving request to the done queue.", 1179 hio); 1180 QUEUE_INSERT2(hio, done); 1181 } 1182 } 1183 } 1184 /* NOTREACHED */ 1185 return (NULL); 1186} 1187 1188static void 1189keepalive_send(struct hast_resource *res, unsigned int ncomp) 1190{ 1191 struct nv *nv; 1192 1193 if (!ISCONNECTED(res, ncomp)) 1194 return; 1195 1196 assert(res->hr_remotein != NULL); 1197 assert(res->hr_remoteout != NULL); 1198 1199 nv = nv_alloc(); 1200 nv_add_uint8(nv, HIO_KEEPALIVE, "cmd"); 1201 if (nv_error(nv) != 0) { 1202 nv_free(nv); 1203 pjdlog_debug(1, 1204 "keepalive_send: Unable to prepare header to send."); 1205 return; 1206 } 1207 if (hast_proto_send(res, res->hr_remoteout, nv, NULL, 0) < 0) { 1208 pjdlog_common(LOG_DEBUG, 1, errno, 1209 "keepalive_send: Unable to send request"); 1210 nv_free(nv); 1211 rw_unlock(&hio_remote_lock[ncomp]); 1212 remote_close(res, ncomp); 1213 rw_rlock(&hio_remote_lock[ncomp]); 1214 return; 1215 } 1216 nv_free(nv); 1217 pjdlog_debug(2, "keepalive_send: Request sent."); 1218} 1219 1220/* 1221 * Thread sends request to secondary node. 1222 */ 1223static void * 1224remote_send_thread(void *arg) 1225{ 1226 struct hast_resource *res = arg; 1227 struct g_gate_ctl_io *ggio; 1228 time_t lastcheck, now; 1229 struct hio *hio; 1230 struct nv *nv; 1231 unsigned int ncomp; 1232 bool wakeup; 1233 uint64_t offset, length; 1234 uint8_t cmd; 1235 void *data; 1236 1237 /* Remote component is 1 for now. */ 1238 ncomp = 1; 1239 lastcheck = time(NULL); 1240 1241 for (;;) { 1242 pjdlog_debug(2, "remote_send: Taking request."); 1243 QUEUE_TAKE1(hio, send, ncomp, RETRY_SLEEP); 1244 if (hio == NULL) { 1245 now = time(NULL); 1246 if (lastcheck + RETRY_SLEEP <= now) { 1247 keepalive_send(res, ncomp); 1248 lastcheck = now; 1249 } 1250 continue; 1251 } 1252 pjdlog_debug(2, "remote_send: (%p) Got request.", hio); 1253 ggio = &hio->hio_ggio; 1254 switch (ggio->gctl_cmd) { 1255 case BIO_READ: 1256 cmd = HIO_READ; 1257 data = NULL; 1258 offset = ggio->gctl_offset; 1259 length = ggio->gctl_length; 1260 break; 1261 case BIO_WRITE: 1262 cmd = HIO_WRITE; 1263 data = ggio->gctl_data; 1264 offset = ggio->gctl_offset; 1265 length = ggio->gctl_length; 1266 break; 1267 case BIO_DELETE: 1268 cmd = HIO_DELETE; 1269 data = NULL; 1270 offset = ggio->gctl_offset; 1271 length = ggio->gctl_length; 1272 break; 1273 case BIO_FLUSH: 1274 cmd = HIO_FLUSH; 1275 data = NULL; 1276 offset = 0; 1277 length = 0; 1278 break; 1279 default: 1280 assert(!"invalid condition"); 1281 abort(); 1282 } 1283 nv = nv_alloc(); 1284 nv_add_uint8(nv, cmd, "cmd"); 1285 nv_add_uint64(nv, (uint64_t)ggio->gctl_seq, "seq"); 1286 nv_add_uint64(nv, offset, "offset"); 1287 nv_add_uint64(nv, length, "length"); 1288 if (nv_error(nv) != 0) { 1289 hio->hio_errors[ncomp] = nv_error(nv); 1290 pjdlog_debug(2, 1291 "remote_send: (%p) Unable to prepare header to send.", 1292 hio); 1293 reqlog(LOG_ERR, 0, ggio, 1294 "Unable to prepare header to send (%s): ", 1295 strerror(nv_error(nv))); 1296 /* Move failed request immediately to the done queue. */ 1297 goto done_queue; 1298 } 1299 pjdlog_debug(2, 1300 "remote_send: (%p) Moving request to the recv queue.", 1301 hio); 1302 /* 1303 * Protect connection from disappearing. 1304 */ 1305 rw_rlock(&hio_remote_lock[ncomp]); 1306 if (!ISCONNECTED(res, ncomp)) { 1307 rw_unlock(&hio_remote_lock[ncomp]); 1308 hio->hio_errors[ncomp] = ENOTCONN; 1309 goto done_queue; 1310 } 1311 /* 1312 * Move the request to recv queue before sending it, because 1313 * in different order we can get reply before we move request 1314 * to recv queue. 1315 */ 1316 mtx_lock(&hio_recv_list_lock[ncomp]); 1317 wakeup = TAILQ_EMPTY(&hio_recv_list[ncomp]); 1318 TAILQ_INSERT_TAIL(&hio_recv_list[ncomp], hio, hio_next[ncomp]); 1319 mtx_unlock(&hio_recv_list_lock[ncomp]); 1320 if (hast_proto_send(res, res->hr_remoteout, nv, data, 1321 data != NULL ? length : 0) < 0) { 1322 hio->hio_errors[ncomp] = errno; 1323 rw_unlock(&hio_remote_lock[ncomp]); 1324 pjdlog_debug(2, 1325 "remote_send: (%p) Unable to send request.", hio); 1326 reqlog(LOG_ERR, 0, ggio, 1327 "Unable to send request (%s): ", 1328 strerror(hio->hio_errors[ncomp])); 1329 remote_close(res, ncomp); 1330 /* 1331 * Take request back from the receive queue and move 1332 * it immediately to the done queue. 1333 */ 1334 mtx_lock(&hio_recv_list_lock[ncomp]); 1335 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, hio_next[ncomp]); 1336 mtx_unlock(&hio_recv_list_lock[ncomp]); 1337 goto done_queue; 1338 } 1339 rw_unlock(&hio_remote_lock[ncomp]); 1340 nv_free(nv); 1341 if (wakeup) 1342 cv_signal(&hio_recv_list_cond[ncomp]); 1343 continue; 1344done_queue: 1345 nv_free(nv); 1346 if (ISSYNCREQ(hio)) { 1347 if (!refcount_release(&hio->hio_countdown)) 1348 continue; 1349 mtx_lock(&sync_lock); 1350 SYNCREQDONE(hio); 1351 mtx_unlock(&sync_lock); 1352 cv_signal(&sync_cond); 1353 continue; 1354 } 1355 if (ggio->gctl_cmd == BIO_WRITE) { 1356 mtx_lock(&res->hr_amp_lock); 1357 if (activemap_need_sync(res->hr_amp, ggio->gctl_offset, 1358 ggio->gctl_length)) { 1359 (void)hast_activemap_flush(res); 1360 } 1361 mtx_unlock(&res->hr_amp_lock); 1362 } 1363 if (!refcount_release(&hio->hio_countdown)) 1364 continue; 1365 pjdlog_debug(2, 1366 "remote_send: (%p) Moving request to the done queue.", 1367 hio); 1368 QUEUE_INSERT2(hio, done); 1369 } 1370 /* NOTREACHED */ 1371 return (NULL); 1372} 1373 1374/* 1375 * Thread receives answer from secondary node and passes it to ggate_send 1376 * thread. 1377 */ 1378static void * 1379remote_recv_thread(void *arg) 1380{ 1381 struct hast_resource *res = arg; 1382 struct g_gate_ctl_io *ggio; 1383 struct hio *hio; 1384 struct nv *nv; 1385 unsigned int ncomp; 1386 uint64_t seq; 1387 int error; 1388 1389 /* Remote component is 1 for now. */ 1390 ncomp = 1; 1391 1392 for (;;) { 1393 /* Wait until there is anything to receive. */ 1394 mtx_lock(&hio_recv_list_lock[ncomp]); 1395 while (TAILQ_EMPTY(&hio_recv_list[ncomp])) { 1396 pjdlog_debug(2, "remote_recv: No requests, waiting."); 1397 cv_wait(&hio_recv_list_cond[ncomp], 1398 &hio_recv_list_lock[ncomp]); 1399 } 1400 mtx_unlock(&hio_recv_list_lock[ncomp]); 1401 rw_rlock(&hio_remote_lock[ncomp]); 1402 if (!ISCONNECTED(res, ncomp)) { 1403 rw_unlock(&hio_remote_lock[ncomp]); 1404 /* 1405 * Connection is dead, so move all pending requests to 1406 * the done queue (one-by-one). 1407 */ 1408 mtx_lock(&hio_recv_list_lock[ncomp]); 1409 hio = TAILQ_FIRST(&hio_recv_list[ncomp]); 1410 assert(hio != NULL); 1411 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1412 hio_next[ncomp]); 1413 mtx_unlock(&hio_recv_list_lock[ncomp]); 1414 goto done_queue; 1415 } 1416 if (hast_proto_recv_hdr(res->hr_remotein, &nv) < 0) { 1417 pjdlog_errno(LOG_ERR, 1418 "Unable to receive reply header"); 1419 rw_unlock(&hio_remote_lock[ncomp]); 1420 remote_close(res, ncomp); 1421 continue; 1422 } 1423 rw_unlock(&hio_remote_lock[ncomp]); 1424 seq = nv_get_uint64(nv, "seq"); 1425 if (seq == 0) { 1426 pjdlog_error("Header contains no 'seq' field."); 1427 nv_free(nv); 1428 continue; 1429 } 1430 mtx_lock(&hio_recv_list_lock[ncomp]); 1431 TAILQ_FOREACH(hio, &hio_recv_list[ncomp], hio_next[ncomp]) { 1432 if (hio->hio_ggio.gctl_seq == seq) { 1433 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1434 hio_next[ncomp]); 1435 break; 1436 } 1437 } 1438 mtx_unlock(&hio_recv_list_lock[ncomp]); 1439 if (hio == NULL) { 1440 pjdlog_error("Found no request matching received 'seq' field (%ju).", 1441 (uintmax_t)seq); 1442 nv_free(nv); 1443 continue; 1444 } 1445 error = nv_get_int16(nv, "error"); 1446 if (error != 0) { 1447 /* Request failed on remote side. */ 1448 hio->hio_errors[ncomp] = error; 1449 nv_free(nv); 1450 goto done_queue; 1451 } 1452 ggio = &hio->hio_ggio; 1453 switch (ggio->gctl_cmd) { 1454 case BIO_READ: 1455 rw_rlock(&hio_remote_lock[ncomp]); 1456 if (!ISCONNECTED(res, ncomp)) { 1457 rw_unlock(&hio_remote_lock[ncomp]); 1458 nv_free(nv); 1459 goto done_queue; 1460 } 1461 if (hast_proto_recv_data(res, res->hr_remotein, nv, 1462 ggio->gctl_data, ggio->gctl_length) < 0) { 1463 hio->hio_errors[ncomp] = errno; 1464 pjdlog_errno(LOG_ERR, 1465 "Unable to receive reply data"); 1466 rw_unlock(&hio_remote_lock[ncomp]); 1467 nv_free(nv); 1468 remote_close(res, ncomp); 1469 goto done_queue; 1470 } 1471 rw_unlock(&hio_remote_lock[ncomp]); 1472 break; 1473 case BIO_WRITE: 1474 case BIO_DELETE: 1475 case BIO_FLUSH: 1476 break; 1477 default: 1478 assert(!"invalid condition"); 1479 abort(); 1480 } 1481 hio->hio_errors[ncomp] = 0; 1482 nv_free(nv); 1483done_queue: 1484 if (refcount_release(&hio->hio_countdown)) { 1485 if (ISSYNCREQ(hio)) { 1486 mtx_lock(&sync_lock); 1487 SYNCREQDONE(hio); 1488 mtx_unlock(&sync_lock); 1489 cv_signal(&sync_cond); 1490 } else { 1491 pjdlog_debug(2, 1492 "remote_recv: (%p) Moving request to the done queue.", 1493 hio); 1494 QUEUE_INSERT2(hio, done); 1495 } 1496 } 1497 } 1498 /* NOTREACHED */ 1499 return (NULL); 1500} 1501 1502/* 1503 * Thread sends answer to the kernel. 1504 */ 1505static void * 1506ggate_send_thread(void *arg) 1507{ 1508 struct hast_resource *res = arg; 1509 struct g_gate_ctl_io *ggio; 1510 struct hio *hio; 1511 unsigned int ii, ncomp, ncomps; 1512 1513 ncomps = HAST_NCOMPONENTS; 1514 1515 for (;;) { 1516 pjdlog_debug(2, "ggate_send: Taking request."); 1517 QUEUE_TAKE2(hio, done); 1518 pjdlog_debug(2, "ggate_send: (%p) Got request.", hio); 1519 ggio = &hio->hio_ggio; 1520 for (ii = 0; ii < ncomps; ii++) { 1521 if (hio->hio_errors[ii] == 0) { 1522 /* 1523 * One successful request is enough to declare 1524 * success. 1525 */ 1526 ggio->gctl_error = 0; 1527 break; 1528 } 1529 } 1530 if (ii == ncomps) { 1531 /* 1532 * None of the requests were successful. 1533 * Use first error. 1534 */ 1535 ggio->gctl_error = hio->hio_errors[0]; 1536 } 1537 if (ggio->gctl_error == 0 && ggio->gctl_cmd == BIO_WRITE) { 1538 mtx_lock(&res->hr_amp_lock); 1539 activemap_write_complete(res->hr_amp, 1540 ggio->gctl_offset, ggio->gctl_length); 1541 mtx_unlock(&res->hr_amp_lock); 1542 } 1543 if (ggio->gctl_cmd == BIO_WRITE) { 1544 /* 1545 * Unlock range we locked. 1546 */ 1547 mtx_lock(&range_lock); 1548 rangelock_del(range_regular, ggio->gctl_offset, 1549 ggio->gctl_length); 1550 if (range_sync_wait) 1551 cv_signal(&range_sync_cond); 1552 mtx_unlock(&range_lock); 1553 /* 1554 * Bump local count if this is first write after 1555 * connection failure with remote node. 1556 */ 1557 ncomp = 1; 1558 rw_rlock(&hio_remote_lock[ncomp]); 1559 if (!ISCONNECTED(res, ncomp)) { 1560 mtx_lock(&metadata_lock); 1561 if (res->hr_primary_localcnt == 1562 res->hr_secondary_remotecnt) { 1563 res->hr_primary_localcnt++; 1564 pjdlog_debug(1, 1565 "Increasing localcnt to %ju.", 1566 (uintmax_t)res->hr_primary_localcnt); 1567 (void)metadata_write(res); 1568 } 1569 mtx_unlock(&metadata_lock); 1570 } 1571 rw_unlock(&hio_remote_lock[ncomp]); 1572 } 1573 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DONE, ggio) < 0) 1574 primary_exit(EX_OSERR, "G_GATE_CMD_DONE failed"); 1575 pjdlog_debug(2, 1576 "ggate_send: (%p) Moving request to the free queue.", hio); 1577 QUEUE_INSERT2(hio, free); 1578 } 1579 /* NOTREACHED */ 1580 return (NULL); 1581} 1582 1583/* 1584 * Thread synchronize local and remote components. 1585 */ 1586static void * 1587sync_thread(void *arg __unused) 1588{ 1589 struct hast_resource *res = arg; 1590 struct hio *hio; 1591 struct g_gate_ctl_io *ggio; 1592 unsigned int ii, ncomp, ncomps; 1593 off_t offset, length, synced; 1594 bool dorewind; 1595 int syncext; 1596 1597 ncomps = HAST_NCOMPONENTS; 1598 dorewind = true; 1599 synced = 0; 1600 offset = -1; 1601 1602 for (;;) { 1603 mtx_lock(&sync_lock); 1604 if (offset >= 0 && !sync_inprogress) { 1605 pjdlog_info("Synchronization interrupted. " 1606 "%jd bytes synchronized so far.", 1607 (intmax_t)synced); 1608 event_send(res, EVENT_SYNCINTR); 1609 } 1610 while (!sync_inprogress) { 1611 dorewind = true; 1612 synced = 0; 1613 cv_wait(&sync_cond, &sync_lock); 1614 } 1615 mtx_unlock(&sync_lock); 1616 /* 1617 * Obtain offset at which we should synchronize. 1618 * Rewind synchronization if needed. 1619 */ 1620 mtx_lock(&res->hr_amp_lock); 1621 if (dorewind) 1622 activemap_sync_rewind(res->hr_amp); 1623 offset = activemap_sync_offset(res->hr_amp, &length, &syncext); 1624 if (syncext != -1) { 1625 /* 1626 * We synchronized entire syncext extent, we can mark 1627 * it as clean now. 1628 */ 1629 if (activemap_extent_complete(res->hr_amp, syncext)) 1630 (void)hast_activemap_flush(res); 1631 } 1632 mtx_unlock(&res->hr_amp_lock); 1633 if (dorewind) { 1634 dorewind = false; 1635 if (offset < 0) 1636 pjdlog_info("Nodes are in sync."); 1637 else { 1638 pjdlog_info("Synchronization started. %ju bytes to go.", 1639 (uintmax_t)(res->hr_extentsize * 1640 activemap_ndirty(res->hr_amp))); 1641 event_send(res, EVENT_SYNCSTART); 1642 } 1643 } 1644 if (offset < 0) { 1645 sync_stop(); 1646 pjdlog_debug(1, "Nothing to synchronize."); 1647 /* 1648 * Synchronization complete, make both localcnt and 1649 * remotecnt equal. 1650 */ 1651 ncomp = 1; 1652 rw_rlock(&hio_remote_lock[ncomp]); 1653 if (ISCONNECTED(res, ncomp)) { 1654 if (synced > 0) { 1655 pjdlog_info("Synchronization complete. " 1656 "%jd bytes synchronized.", 1657 (intmax_t)synced); 1658 event_send(res, EVENT_SYNCDONE); 1659 } 1660 mtx_lock(&metadata_lock); 1661 res->hr_syncsrc = HAST_SYNCSRC_UNDEF; 1662 res->hr_primary_localcnt = 1663 res->hr_secondary_localcnt; 1664 res->hr_primary_remotecnt = 1665 res->hr_secondary_remotecnt; 1666 pjdlog_debug(1, 1667 "Setting localcnt to %ju and remotecnt to %ju.", 1668 (uintmax_t)res->hr_primary_localcnt, 1669 (uintmax_t)res->hr_secondary_localcnt); 1670 (void)metadata_write(res); 1671 mtx_unlock(&metadata_lock); 1672 } 1673 rw_unlock(&hio_remote_lock[ncomp]); 1674 continue; 1675 } 1676 pjdlog_debug(2, "sync: Taking free request."); 1677 QUEUE_TAKE2(hio, free); 1678 pjdlog_debug(2, "sync: (%p) Got free request.", hio); 1679 /* 1680 * Lock the range we are going to synchronize. We don't want 1681 * race where someone writes between our read and write. 1682 */ 1683 for (;;) { 1684 mtx_lock(&range_lock); 1685 if (rangelock_islocked(range_regular, offset, length)) { 1686 pjdlog_debug(2, 1687 "sync: Range offset=%jd length=%jd locked.", 1688 (intmax_t)offset, (intmax_t)length); 1689 range_sync_wait = true; 1690 cv_wait(&range_sync_cond, &range_lock); 1691 range_sync_wait = false; 1692 mtx_unlock(&range_lock); 1693 continue; 1694 } 1695 if (rangelock_add(range_sync, offset, length) < 0) { 1696 mtx_unlock(&range_lock); 1697 pjdlog_debug(2, 1698 "sync: Range offset=%jd length=%jd is already locked, waiting.", 1699 (intmax_t)offset, (intmax_t)length); 1700 sleep(1); 1701 continue; 1702 } 1703 mtx_unlock(&range_lock); 1704 break; 1705 } 1706 /* 1707 * First read the data from synchronization source. 1708 */ 1709 SYNCREQ(hio); 1710 ggio = &hio->hio_ggio; 1711 ggio->gctl_cmd = BIO_READ; 1712 ggio->gctl_offset = offset; 1713 ggio->gctl_length = length; 1714 ggio->gctl_error = 0; 1715 for (ii = 0; ii < ncomps; ii++) 1716 hio->hio_errors[ii] = EINVAL; 1717 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 1718 hio); 1719 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 1720 hio); 1721 mtx_lock(&metadata_lock); 1722 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1723 /* 1724 * This range is up-to-date on local component, 1725 * so handle request locally. 1726 */ 1727 /* Local component is 0 for now. */ 1728 ncomp = 0; 1729 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 1730 assert(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 1731 /* 1732 * This range is out-of-date on local component, 1733 * so send request to the remote node. 1734 */ 1735 /* Remote component is 1 for now. */ 1736 ncomp = 1; 1737 } 1738 mtx_unlock(&metadata_lock); 1739 refcount_init(&hio->hio_countdown, 1); 1740 QUEUE_INSERT1(hio, send, ncomp); 1741 1742 /* 1743 * Let's wait for READ to finish. 1744 */ 1745 mtx_lock(&sync_lock); 1746 while (!ISSYNCREQDONE(hio)) 1747 cv_wait(&sync_cond, &sync_lock); 1748 mtx_unlock(&sync_lock); 1749 1750 if (hio->hio_errors[ncomp] != 0) { 1751 pjdlog_error("Unable to read synchronization data: %s.", 1752 strerror(hio->hio_errors[ncomp])); 1753 goto free_queue; 1754 } 1755 1756 /* 1757 * We read the data from synchronization source, now write it 1758 * to synchronization target. 1759 */ 1760 SYNCREQ(hio); 1761 ggio->gctl_cmd = BIO_WRITE; 1762 for (ii = 0; ii < ncomps; ii++) 1763 hio->hio_errors[ii] = EINVAL; 1764 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 1765 hio); 1766 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 1767 hio); 1768 mtx_lock(&metadata_lock); 1769 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1770 /* 1771 * This range is up-to-date on local component, 1772 * so we update remote component. 1773 */ 1774 /* Remote component is 1 for now. */ 1775 ncomp = 1; 1776 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 1777 assert(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 1778 /* 1779 * This range is out-of-date on local component, 1780 * so we update it. 1781 */ 1782 /* Local component is 0 for now. */ 1783 ncomp = 0; 1784 } 1785 mtx_unlock(&metadata_lock); 1786 1787 pjdlog_debug(2, "sync: (%p) Moving request to the send queues.", 1788 hio); 1789 refcount_init(&hio->hio_countdown, 1); 1790 QUEUE_INSERT1(hio, send, ncomp); 1791 1792 /* 1793 * Let's wait for WRITE to finish. 1794 */ 1795 mtx_lock(&sync_lock); 1796 while (!ISSYNCREQDONE(hio)) 1797 cv_wait(&sync_cond, &sync_lock); 1798 mtx_unlock(&sync_lock); 1799 1800 if (hio->hio_errors[ncomp] != 0) { 1801 pjdlog_error("Unable to write synchronization data: %s.", 1802 strerror(hio->hio_errors[ncomp])); 1803 goto free_queue; 1804 } 1805 1806 synced += length; 1807free_queue: 1808 mtx_lock(&range_lock); 1809 rangelock_del(range_sync, offset, length); 1810 if (range_regular_wait) 1811 cv_signal(&range_regular_cond); 1812 mtx_unlock(&range_lock); 1813 pjdlog_debug(2, "sync: (%p) Moving request to the free queue.", 1814 hio); 1815 QUEUE_INSERT2(hio, free); 1816 } 1817 /* NOTREACHED */ 1818 return (NULL); 1819} 1820 1821static void 1822config_reload(void) 1823{ 1824 struct hastd_config *newcfg; 1825 struct hast_resource *res; 1826 unsigned int ii, ncomps; 1827 int modified; 1828 1829 pjdlog_info("Reloading configuration..."); 1830 1831 ncomps = HAST_NCOMPONENTS; 1832 1833 newcfg = yy_config_parse(cfgpath, false); 1834 if (newcfg == NULL) 1835 goto failed; 1836 1837 TAILQ_FOREACH(res, &newcfg->hc_resources, hr_next) { 1838 if (strcmp(res->hr_name, gres->hr_name) == 0) 1839 break; 1840 } 1841 /* 1842 * If resource was removed from the configuration file, resource 1843 * name, provider name or path to local component was modified we 1844 * shouldn't be here. This means that someone modified configuration 1845 * file and send SIGHUP to us instead of main hastd process. 1846 * Log advice and ignore the signal. 1847 */ 1848 if (res == NULL || strcmp(gres->hr_name, res->hr_name) != 0 || 1849 strcmp(gres->hr_provname, res->hr_provname) != 0 || 1850 strcmp(gres->hr_localpath, res->hr_localpath) != 0) { 1851 pjdlog_warning("To reload configuration send SIGHUP to the main hastd process (pid %u).", 1852 (unsigned int)getppid()); 1853 goto failed; 1854 } 1855 1856#define MODIFIED_REMOTEADDR 0x1 1857#define MODIFIED_REPLICATION 0x2 1858#define MODIFIED_TIMEOUT 0x4 1859#define MODIFIED_EXEC 0x8 1860 modified = 0; 1861 if (strcmp(gres->hr_remoteaddr, res->hr_remoteaddr) != 0) { 1862 /* 1863 * Don't copy res->hr_remoteaddr to gres just yet. 1864 * We want remote_close() to log disconnect from the old 1865 * addresses, not from the new ones. 1866 */ 1867 modified |= MODIFIED_REMOTEADDR; 1868 } 1869 if (gres->hr_replication != res->hr_replication) { 1870 gres->hr_replication = res->hr_replication; 1871 modified |= MODIFIED_REPLICATION; 1872 } 1873 if (gres->hr_timeout != res->hr_timeout) { 1874 gres->hr_timeout = res->hr_timeout; 1875 modified |= MODIFIED_TIMEOUT; 1876 } 1877 if (strcmp(gres->hr_exec, res->hr_exec) != 0) { 1878 strlcpy(gres->hr_exec, res->hr_exec, sizeof(gres->hr_exec)); 1879 modified |= MODIFIED_EXEC; 1880 } 1881 /* 1882 * If only timeout was modified we only need to change it without 1883 * reconnecting. 1884 */ 1885 if (modified == MODIFIED_TIMEOUT) { 1886 for (ii = 0; ii < ncomps; ii++) { 1887 if (!ISREMOTE(ii)) 1888 continue; 1889 rw_rlock(&hio_remote_lock[ii]); 1890 if (!ISCONNECTED(gres, ii)) { 1891 rw_unlock(&hio_remote_lock[ii]); 1892 continue; 1893 } 1894 rw_unlock(&hio_remote_lock[ii]); 1895 if (proto_timeout(gres->hr_remotein, 1896 gres->hr_timeout) < 0) { 1897 pjdlog_errno(LOG_WARNING, 1898 "Unable to set connection timeout"); 1899 } 1900 if (proto_timeout(gres->hr_remoteout, 1901 gres->hr_timeout) < 0) { 1902 pjdlog_errno(LOG_WARNING, 1903 "Unable to set connection timeout"); 1904 } 1905 } 1906 } else if ((modified & 1907 (MODIFIED_REMOTEADDR | MODIFIED_REPLICATION)) != 0) { 1908 for (ii = 0; ii < ncomps; ii++) { 1909 if (!ISREMOTE(ii)) 1910 continue; 1911 remote_close(gres, ii); 1912 } 1913 if (modified & MODIFIED_REMOTEADDR) { 1914 strlcpy(gres->hr_remoteaddr, res->hr_remoteaddr, 1915 sizeof(gres->hr_remoteaddr)); 1916 } 1917 } 1918#undef MODIFIED_REMOTEADDR 1919#undef MODIFIED_REPLICATION 1920#undef MODIFIED_TIMEOUT 1921#undef MODIFIED_EXEC 1922 1923 pjdlog_info("Configuration reloaded successfully."); 1924 return; 1925failed: 1926 if (newcfg != NULL) { 1927 if (newcfg->hc_controlconn != NULL) 1928 proto_close(newcfg->hc_controlconn); 1929 if (newcfg->hc_listenconn != NULL) 1930 proto_close(newcfg->hc_listenconn); 1931 yy_config_free(newcfg); 1932 } 1933 pjdlog_warning("Configuration not reloaded."); 1934} 1935 1936static void 1937guard_one(struct hast_resource *res, unsigned int ncomp) 1938{ 1939 struct proto_conn *in, *out; 1940 1941 if (!ISREMOTE(ncomp)) 1942 return; 1943 1944 rw_rlock(&hio_remote_lock[ncomp]); 1945 1946 if (!real_remote(res)) { 1947 rw_unlock(&hio_remote_lock[ncomp]); 1948 return; 1949 } 1950 1951 if (ISCONNECTED(res, ncomp)) { 1952 assert(res->hr_remotein != NULL); 1953 assert(res->hr_remoteout != NULL); 1954 rw_unlock(&hio_remote_lock[ncomp]); 1955 pjdlog_debug(2, "remote_guard: Connection to %s is ok.", 1956 res->hr_remoteaddr); 1957 return; 1958 } 1959 1960 assert(res->hr_remotein == NULL); 1961 assert(res->hr_remoteout == NULL); 1962 /* 1963 * Upgrade the lock. It doesn't have to be atomic as no other thread 1964 * can change connection status from disconnected to connected. 1965 */ 1966 rw_unlock(&hio_remote_lock[ncomp]); 1967 pjdlog_debug(2, "remote_guard: Reconnecting to %s.", 1968 res->hr_remoteaddr); 1969 in = out = NULL; 1970 if (init_remote(res, &in, &out)) { 1971 rw_wlock(&hio_remote_lock[ncomp]); 1972 assert(res->hr_remotein == NULL); 1973 assert(res->hr_remoteout == NULL); 1974 assert(in != NULL && out != NULL); 1975 res->hr_remotein = in; 1976 res->hr_remoteout = out; 1977 rw_unlock(&hio_remote_lock[ncomp]); 1978 pjdlog_info("Successfully reconnected to %s.", 1979 res->hr_remoteaddr); 1980 sync_start(); 1981 } else { 1982 /* Both connections should be NULL. */ 1983 assert(res->hr_remotein == NULL); 1984 assert(res->hr_remoteout == NULL); 1985 assert(in == NULL && out == NULL); 1986 pjdlog_debug(2, "remote_guard: Reconnect to %s failed.", 1987 res->hr_remoteaddr); 1988 } 1989} 1990 1991/* 1992 * Thread guards remote connections and reconnects when needed, handles 1993 * signals, etc. 1994 */ 1995static void * 1996guard_thread(void *arg) 1997{ 1998 struct hast_resource *res = arg; 1999 unsigned int ii, ncomps; 2000 struct timespec timeout; 2001 time_t lastcheck, now; 2002 sigset_t mask; 2003 int signo; 2004 2005 ncomps = HAST_NCOMPONENTS; 2006 lastcheck = time(NULL); 2007 2008 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 2009 PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0); 2010 PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0); 2011 PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0); 2012 2013 timeout.tv_sec = RETRY_SLEEP; 2014 timeout.tv_nsec = 0; 2015 signo = -1; 2016 2017 for (;;) { 2018 switch (signo) { 2019 case SIGHUP: 2020 config_reload(); 2021 break; 2022 case SIGINT: 2023 case SIGTERM: 2024 sigexit_received = true; 2025 primary_exitx(EX_OK, 2026 "Termination signal received, exiting."); 2027 break; 2028 default: 2029 break; 2030 } 2031 2032 pjdlog_debug(2, "remote_guard: Checking connections."); 2033 now = time(NULL); 2034 if (lastcheck + RETRY_SLEEP <= now) { 2035 for (ii = 0; ii < ncomps; ii++) 2036 guard_one(res, ii); 2037 lastcheck = now; 2038 } 2039 signo = sigtimedwait(&mask, NULL, &timeout); 2040 } 2041 /* NOTREACHED */ 2042 return (NULL); 2043} 2044