primary.c revision 218043
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 218043 2011-01-28 21:52:37Z 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, mode; 794 795 /* 796 * Create communication channel between parent and child. 797 */ 798 if (proto_client("socketpair://", &res->hr_ctrl) < 0) { 799 /* TODO: There's no need for this to be fatal error. */ 800 KEEP_ERRNO((void)pidfile_remove(pfh)); 801 pjdlog_exit(EX_OSERR, 802 "Unable to create control sockets between parent and child"); 803 } 804 /* 805 * Create communication channel between child and parent. 806 */ 807 if (proto_client("socketpair://", &res->hr_event) < 0) { 808 /* TODO: There's no need for this to be fatal error. */ 809 KEEP_ERRNO((void)pidfile_remove(pfh)); 810 pjdlog_exit(EX_OSERR, 811 "Unable to create event sockets between child and parent"); 812 } 813 814 pid = fork(); 815 if (pid < 0) { 816 /* TODO: There's no need for this to be fatal error. */ 817 KEEP_ERRNO((void)pidfile_remove(pfh)); 818 pjdlog_exit(EX_TEMPFAIL, "Unable to fork"); 819 } 820 821 if (pid > 0) { 822 /* This is parent. */ 823 /* Declare that we are receiver. */ 824 proto_recv(res->hr_event, NULL, 0); 825 /* Declare that we are sender. */ 826 proto_send(res->hr_ctrl, NULL, 0); 827 res->hr_workerpid = pid; 828 return; 829 } 830 831 gres = res; 832 mode = pjdlog_mode_get(); 833 834 /* Declare that we are sender. */ 835 proto_send(res->hr_event, NULL, 0); 836 /* Declare that we are receiver. */ 837 proto_recv(res->hr_ctrl, NULL, 0); 838 descriptors_cleanup(res); 839 840 pjdlog_init(mode); 841 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 842 setproctitle("%s (primary)", res->hr_name); 843 844 init_local(res); 845 init_ggate(res); 846 init_environment(res); 847 848 /* 849 * Create the guard thread first, so we can handle signals from the 850 * very begining. 851 */ 852 error = pthread_create(&td, NULL, guard_thread, res); 853 assert(error == 0); 854 /* 855 * Create the control thread before sending any event to the parent, 856 * as we can deadlock when parent sends control request to worker, 857 * but worker has no control thread started yet, so parent waits. 858 * In the meantime worker sends an event to the parent, but parent 859 * is unable to handle the event, because it waits for control 860 * request response. 861 */ 862 error = pthread_create(&td, NULL, ctrl_thread, res); 863 assert(error == 0); 864 if (real_remote(res) && init_remote(res, NULL, NULL)) 865 sync_start(); 866 error = pthread_create(&td, NULL, ggate_recv_thread, res); 867 assert(error == 0); 868 error = pthread_create(&td, NULL, local_send_thread, res); 869 assert(error == 0); 870 error = pthread_create(&td, NULL, remote_send_thread, res); 871 assert(error == 0); 872 error = pthread_create(&td, NULL, remote_recv_thread, res); 873 assert(error == 0); 874 error = pthread_create(&td, NULL, ggate_send_thread, res); 875 assert(error == 0); 876 (void)sync_thread(res); 877} 878 879static void 880reqlog(int loglevel, int debuglevel, struct g_gate_ctl_io *ggio, const char *fmt, ...) 881{ 882 char msg[1024]; 883 va_list ap; 884 int len; 885 886 va_start(ap, fmt); 887 len = vsnprintf(msg, sizeof(msg), fmt, ap); 888 va_end(ap); 889 if ((size_t)len < sizeof(msg)) { 890 switch (ggio->gctl_cmd) { 891 case BIO_READ: 892 (void)snprintf(msg + len, sizeof(msg) - len, 893 "READ(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 894 (uintmax_t)ggio->gctl_length); 895 break; 896 case BIO_DELETE: 897 (void)snprintf(msg + len, sizeof(msg) - len, 898 "DELETE(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 899 (uintmax_t)ggio->gctl_length); 900 break; 901 case BIO_FLUSH: 902 (void)snprintf(msg + len, sizeof(msg) - len, "FLUSH."); 903 break; 904 case BIO_WRITE: 905 (void)snprintf(msg + len, sizeof(msg) - len, 906 "WRITE(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 907 (uintmax_t)ggio->gctl_length); 908 break; 909 default: 910 (void)snprintf(msg + len, sizeof(msg) - len, 911 "UNKNOWN(%u).", (unsigned int)ggio->gctl_cmd); 912 break; 913 } 914 } 915 pjdlog_common(loglevel, debuglevel, -1, "%s", msg); 916} 917 918static void 919remote_close(struct hast_resource *res, int ncomp) 920{ 921 922 rw_wlock(&hio_remote_lock[ncomp]); 923 /* 924 * A race is possible between dropping rlock and acquiring wlock - 925 * another thread can close connection in-between. 926 */ 927 if (!ISCONNECTED(res, ncomp)) { 928 assert(res->hr_remotein == NULL); 929 assert(res->hr_remoteout == NULL); 930 rw_unlock(&hio_remote_lock[ncomp]); 931 return; 932 } 933 934 assert(res->hr_remotein != NULL); 935 assert(res->hr_remoteout != NULL); 936 937 pjdlog_debug(2, "Closing incoming connection to %s.", 938 res->hr_remoteaddr); 939 proto_close(res->hr_remotein); 940 res->hr_remotein = NULL; 941 pjdlog_debug(2, "Closing outgoing connection to %s.", 942 res->hr_remoteaddr); 943 proto_close(res->hr_remoteout); 944 res->hr_remoteout = NULL; 945 946 rw_unlock(&hio_remote_lock[ncomp]); 947 948 pjdlog_warning("Disconnected from %s.", res->hr_remoteaddr); 949 950 /* 951 * Stop synchronization if in-progress. 952 */ 953 sync_stop(); 954 955 event_send(res, EVENT_DISCONNECT); 956} 957 958/* 959 * Thread receives ggate I/O requests from the kernel and passes them to 960 * appropriate threads: 961 * WRITE - always goes to both local_send and remote_send threads 962 * READ (when the block is up-to-date on local component) - 963 * only local_send thread 964 * READ (when the block isn't up-to-date on local component) - 965 * only remote_send thread 966 * DELETE - always goes to both local_send and remote_send threads 967 * FLUSH - always goes to both local_send and remote_send threads 968 */ 969static void * 970ggate_recv_thread(void *arg) 971{ 972 struct hast_resource *res = arg; 973 struct g_gate_ctl_io *ggio; 974 struct hio *hio; 975 unsigned int ii, ncomp, ncomps; 976 int error; 977 978 ncomps = HAST_NCOMPONENTS; 979 980 for (;;) { 981 pjdlog_debug(2, "ggate_recv: Taking free request."); 982 QUEUE_TAKE2(hio, free); 983 pjdlog_debug(2, "ggate_recv: (%p) Got free request.", hio); 984 ggio = &hio->hio_ggio; 985 ggio->gctl_unit = res->hr_ggateunit; 986 ggio->gctl_length = MAXPHYS; 987 ggio->gctl_error = 0; 988 pjdlog_debug(2, 989 "ggate_recv: (%p) Waiting for request from the kernel.", 990 hio); 991 if (ioctl(res->hr_ggatefd, G_GATE_CMD_START, ggio) < 0) { 992 if (sigexit_received) 993 pthread_exit(NULL); 994 primary_exit(EX_OSERR, "G_GATE_CMD_START failed"); 995 } 996 error = ggio->gctl_error; 997 switch (error) { 998 case 0: 999 break; 1000 case ECANCELED: 1001 /* Exit gracefully. */ 1002 if (!sigexit_received) { 1003 pjdlog_debug(2, 1004 "ggate_recv: (%p) Received cancel from the kernel.", 1005 hio); 1006 pjdlog_info("Received cancel from the kernel, exiting."); 1007 } 1008 pthread_exit(NULL); 1009 case ENOMEM: 1010 /* 1011 * Buffer too small? Impossible, we allocate MAXPHYS 1012 * bytes - request can't be bigger than that. 1013 */ 1014 /* FALLTHROUGH */ 1015 case ENXIO: 1016 default: 1017 primary_exitx(EX_OSERR, "G_GATE_CMD_START failed: %s.", 1018 strerror(error)); 1019 } 1020 for (ii = 0; ii < ncomps; ii++) 1021 hio->hio_errors[ii] = EINVAL; 1022 reqlog(LOG_DEBUG, 2, ggio, 1023 "ggate_recv: (%p) Request received from the kernel: ", 1024 hio); 1025 /* 1026 * Inform all components about new write request. 1027 * For read request prefer local component unless the given 1028 * range is out-of-date, then use remote component. 1029 */ 1030 switch (ggio->gctl_cmd) { 1031 case BIO_READ: 1032 pjdlog_debug(2, 1033 "ggate_recv: (%p) Moving request to the send queue.", 1034 hio); 1035 refcount_init(&hio->hio_countdown, 1); 1036 mtx_lock(&metadata_lock); 1037 if (res->hr_syncsrc == HAST_SYNCSRC_UNDEF || 1038 res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1039 /* 1040 * This range is up-to-date on local component, 1041 * so handle request locally. 1042 */ 1043 /* Local component is 0 for now. */ 1044 ncomp = 0; 1045 } else /* if (res->hr_syncsrc == 1046 HAST_SYNCSRC_SECONDARY) */ { 1047 assert(res->hr_syncsrc == 1048 HAST_SYNCSRC_SECONDARY); 1049 /* 1050 * This range is out-of-date on local component, 1051 * so send request to the remote node. 1052 */ 1053 /* Remote component is 1 for now. */ 1054 ncomp = 1; 1055 } 1056 mtx_unlock(&metadata_lock); 1057 QUEUE_INSERT1(hio, send, ncomp); 1058 break; 1059 case BIO_WRITE: 1060 if (res->hr_resuid == 0) { 1061 /* This is first write, initialize resuid. */ 1062 (void)init_resuid(res); 1063 } 1064 for (;;) { 1065 mtx_lock(&range_lock); 1066 if (rangelock_islocked(range_sync, 1067 ggio->gctl_offset, ggio->gctl_length)) { 1068 pjdlog_debug(2, 1069 "regular: Range offset=%jd length=%zu locked.", 1070 (intmax_t)ggio->gctl_offset, 1071 (size_t)ggio->gctl_length); 1072 range_regular_wait = true; 1073 cv_wait(&range_regular_cond, &range_lock); 1074 range_regular_wait = false; 1075 mtx_unlock(&range_lock); 1076 continue; 1077 } 1078 if (rangelock_add(range_regular, 1079 ggio->gctl_offset, ggio->gctl_length) < 0) { 1080 mtx_unlock(&range_lock); 1081 pjdlog_debug(2, 1082 "regular: Range offset=%jd length=%zu is already locked, waiting.", 1083 (intmax_t)ggio->gctl_offset, 1084 (size_t)ggio->gctl_length); 1085 sleep(1); 1086 continue; 1087 } 1088 mtx_unlock(&range_lock); 1089 break; 1090 } 1091 mtx_lock(&res->hr_amp_lock); 1092 if (activemap_write_start(res->hr_amp, 1093 ggio->gctl_offset, ggio->gctl_length)) { 1094 (void)hast_activemap_flush(res); 1095 } 1096 mtx_unlock(&res->hr_amp_lock); 1097 /* FALLTHROUGH */ 1098 case BIO_DELETE: 1099 case BIO_FLUSH: 1100 pjdlog_debug(2, 1101 "ggate_recv: (%p) Moving request to the send queues.", 1102 hio); 1103 refcount_init(&hio->hio_countdown, ncomps); 1104 for (ii = 0; ii < ncomps; ii++) 1105 QUEUE_INSERT1(hio, send, ii); 1106 break; 1107 } 1108 } 1109 /* NOTREACHED */ 1110 return (NULL); 1111} 1112 1113/* 1114 * Thread reads from or writes to local component. 1115 * If local read fails, it redirects it to remote_send thread. 1116 */ 1117static void * 1118local_send_thread(void *arg) 1119{ 1120 struct hast_resource *res = arg; 1121 struct g_gate_ctl_io *ggio; 1122 struct hio *hio; 1123 unsigned int ncomp, rncomp; 1124 ssize_t ret; 1125 1126 /* Local component is 0 for now. */ 1127 ncomp = 0; 1128 /* Remote component is 1 for now. */ 1129 rncomp = 1; 1130 1131 for (;;) { 1132 pjdlog_debug(2, "local_send: Taking request."); 1133 QUEUE_TAKE1(hio, send, ncomp, 0); 1134 pjdlog_debug(2, "local_send: (%p) Got request.", hio); 1135 ggio = &hio->hio_ggio; 1136 switch (ggio->gctl_cmd) { 1137 case BIO_READ: 1138 ret = pread(res->hr_localfd, ggio->gctl_data, 1139 ggio->gctl_length, 1140 ggio->gctl_offset + res->hr_localoff); 1141 if (ret == ggio->gctl_length) 1142 hio->hio_errors[ncomp] = 0; 1143 else { 1144 /* 1145 * If READ failed, try to read from remote node. 1146 */ 1147 if (ret < 0) { 1148 reqlog(LOG_WARNING, 0, ggio, 1149 "Local request failed (%s), trying remote node. ", 1150 strerror(errno)); 1151 } else if (ret != ggio->gctl_length) { 1152 reqlog(LOG_WARNING, 0, ggio, 1153 "Local request failed (%zd != %jd), trying remote node. ", 1154 ret, (intmax_t)ggio->gctl_length); 1155 } 1156 QUEUE_INSERT1(hio, send, rncomp); 1157 continue; 1158 } 1159 break; 1160 case BIO_WRITE: 1161 ret = pwrite(res->hr_localfd, ggio->gctl_data, 1162 ggio->gctl_length, 1163 ggio->gctl_offset + res->hr_localoff); 1164 if (ret < 0) { 1165 hio->hio_errors[ncomp] = errno; 1166 reqlog(LOG_WARNING, 0, ggio, 1167 "Local request failed (%s): ", 1168 strerror(errno)); 1169 } else if (ret != ggio->gctl_length) { 1170 hio->hio_errors[ncomp] = EIO; 1171 reqlog(LOG_WARNING, 0, ggio, 1172 "Local request failed (%zd != %jd): ", 1173 ret, (intmax_t)ggio->gctl_length); 1174 } else { 1175 hio->hio_errors[ncomp] = 0; 1176 } 1177 break; 1178 case BIO_DELETE: 1179 ret = g_delete(res->hr_localfd, 1180 ggio->gctl_offset + res->hr_localoff, 1181 ggio->gctl_length); 1182 if (ret < 0) { 1183 hio->hio_errors[ncomp] = errno; 1184 reqlog(LOG_WARNING, 0, ggio, 1185 "Local request failed (%s): ", 1186 strerror(errno)); 1187 } else { 1188 hio->hio_errors[ncomp] = 0; 1189 } 1190 break; 1191 case BIO_FLUSH: 1192 ret = g_flush(res->hr_localfd); 1193 if (ret < 0) { 1194 hio->hio_errors[ncomp] = errno; 1195 reqlog(LOG_WARNING, 0, ggio, 1196 "Local request failed (%s): ", 1197 strerror(errno)); 1198 } else { 1199 hio->hio_errors[ncomp] = 0; 1200 } 1201 break; 1202 } 1203 if (refcount_release(&hio->hio_countdown)) { 1204 if (ISSYNCREQ(hio)) { 1205 mtx_lock(&sync_lock); 1206 SYNCREQDONE(hio); 1207 mtx_unlock(&sync_lock); 1208 cv_signal(&sync_cond); 1209 } else { 1210 pjdlog_debug(2, 1211 "local_send: (%p) Moving request to the done queue.", 1212 hio); 1213 QUEUE_INSERT2(hio, done); 1214 } 1215 } 1216 } 1217 /* NOTREACHED */ 1218 return (NULL); 1219} 1220 1221static void 1222keepalive_send(struct hast_resource *res, unsigned int ncomp) 1223{ 1224 struct nv *nv; 1225 1226 if (!ISCONNECTED(res, ncomp)) 1227 return; 1228 1229 assert(res->hr_remotein != NULL); 1230 assert(res->hr_remoteout != NULL); 1231 1232 nv = nv_alloc(); 1233 nv_add_uint8(nv, HIO_KEEPALIVE, "cmd"); 1234 if (nv_error(nv) != 0) { 1235 nv_free(nv); 1236 pjdlog_debug(1, 1237 "keepalive_send: Unable to prepare header to send."); 1238 return; 1239 } 1240 if (hast_proto_send(res, res->hr_remoteout, nv, NULL, 0) < 0) { 1241 pjdlog_common(LOG_DEBUG, 1, errno, 1242 "keepalive_send: Unable to send request"); 1243 nv_free(nv); 1244 rw_unlock(&hio_remote_lock[ncomp]); 1245 remote_close(res, ncomp); 1246 rw_rlock(&hio_remote_lock[ncomp]); 1247 return; 1248 } 1249 nv_free(nv); 1250 pjdlog_debug(2, "keepalive_send: Request sent."); 1251} 1252 1253/* 1254 * Thread sends request to secondary node. 1255 */ 1256static void * 1257remote_send_thread(void *arg) 1258{ 1259 struct hast_resource *res = arg; 1260 struct g_gate_ctl_io *ggio; 1261 time_t lastcheck, now; 1262 struct hio *hio; 1263 struct nv *nv; 1264 unsigned int ncomp; 1265 bool wakeup; 1266 uint64_t offset, length; 1267 uint8_t cmd; 1268 void *data; 1269 1270 /* Remote component is 1 for now. */ 1271 ncomp = 1; 1272 lastcheck = time(NULL); 1273 1274 for (;;) { 1275 pjdlog_debug(2, "remote_send: Taking request."); 1276 QUEUE_TAKE1(hio, send, ncomp, RETRY_SLEEP); 1277 if (hio == NULL) { 1278 now = time(NULL); 1279 if (lastcheck + RETRY_SLEEP <= now) { 1280 keepalive_send(res, ncomp); 1281 lastcheck = now; 1282 } 1283 continue; 1284 } 1285 pjdlog_debug(2, "remote_send: (%p) Got request.", hio); 1286 ggio = &hio->hio_ggio; 1287 switch (ggio->gctl_cmd) { 1288 case BIO_READ: 1289 cmd = HIO_READ; 1290 data = NULL; 1291 offset = ggio->gctl_offset; 1292 length = ggio->gctl_length; 1293 break; 1294 case BIO_WRITE: 1295 cmd = HIO_WRITE; 1296 data = ggio->gctl_data; 1297 offset = ggio->gctl_offset; 1298 length = ggio->gctl_length; 1299 break; 1300 case BIO_DELETE: 1301 cmd = HIO_DELETE; 1302 data = NULL; 1303 offset = ggio->gctl_offset; 1304 length = ggio->gctl_length; 1305 break; 1306 case BIO_FLUSH: 1307 cmd = HIO_FLUSH; 1308 data = NULL; 1309 offset = 0; 1310 length = 0; 1311 break; 1312 default: 1313 assert(!"invalid condition"); 1314 abort(); 1315 } 1316 nv = nv_alloc(); 1317 nv_add_uint8(nv, cmd, "cmd"); 1318 nv_add_uint64(nv, (uint64_t)ggio->gctl_seq, "seq"); 1319 nv_add_uint64(nv, offset, "offset"); 1320 nv_add_uint64(nv, length, "length"); 1321 if (nv_error(nv) != 0) { 1322 hio->hio_errors[ncomp] = nv_error(nv); 1323 pjdlog_debug(2, 1324 "remote_send: (%p) Unable to prepare header to send.", 1325 hio); 1326 reqlog(LOG_ERR, 0, ggio, 1327 "Unable to prepare header to send (%s): ", 1328 strerror(nv_error(nv))); 1329 /* Move failed request immediately to the done queue. */ 1330 goto done_queue; 1331 } 1332 pjdlog_debug(2, 1333 "remote_send: (%p) Moving request to the recv queue.", 1334 hio); 1335 /* 1336 * Protect connection from disappearing. 1337 */ 1338 rw_rlock(&hio_remote_lock[ncomp]); 1339 if (!ISCONNECTED(res, ncomp)) { 1340 rw_unlock(&hio_remote_lock[ncomp]); 1341 hio->hio_errors[ncomp] = ENOTCONN; 1342 goto done_queue; 1343 } 1344 /* 1345 * Move the request to recv queue before sending it, because 1346 * in different order we can get reply before we move request 1347 * to recv queue. 1348 */ 1349 mtx_lock(&hio_recv_list_lock[ncomp]); 1350 wakeup = TAILQ_EMPTY(&hio_recv_list[ncomp]); 1351 TAILQ_INSERT_TAIL(&hio_recv_list[ncomp], hio, hio_next[ncomp]); 1352 mtx_unlock(&hio_recv_list_lock[ncomp]); 1353 if (hast_proto_send(res, res->hr_remoteout, nv, data, 1354 data != NULL ? length : 0) < 0) { 1355 hio->hio_errors[ncomp] = errno; 1356 rw_unlock(&hio_remote_lock[ncomp]); 1357 pjdlog_debug(2, 1358 "remote_send: (%p) Unable to send request.", hio); 1359 reqlog(LOG_ERR, 0, ggio, 1360 "Unable to send request (%s): ", 1361 strerror(hio->hio_errors[ncomp])); 1362 remote_close(res, ncomp); 1363 /* 1364 * Take request back from the receive queue and move 1365 * it immediately to the done queue. 1366 */ 1367 mtx_lock(&hio_recv_list_lock[ncomp]); 1368 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, hio_next[ncomp]); 1369 mtx_unlock(&hio_recv_list_lock[ncomp]); 1370 goto done_queue; 1371 } 1372 rw_unlock(&hio_remote_lock[ncomp]); 1373 nv_free(nv); 1374 if (wakeup) 1375 cv_signal(&hio_recv_list_cond[ncomp]); 1376 continue; 1377done_queue: 1378 nv_free(nv); 1379 if (ISSYNCREQ(hio)) { 1380 if (!refcount_release(&hio->hio_countdown)) 1381 continue; 1382 mtx_lock(&sync_lock); 1383 SYNCREQDONE(hio); 1384 mtx_unlock(&sync_lock); 1385 cv_signal(&sync_cond); 1386 continue; 1387 } 1388 if (ggio->gctl_cmd == BIO_WRITE) { 1389 mtx_lock(&res->hr_amp_lock); 1390 if (activemap_need_sync(res->hr_amp, ggio->gctl_offset, 1391 ggio->gctl_length)) { 1392 (void)hast_activemap_flush(res); 1393 } 1394 mtx_unlock(&res->hr_amp_lock); 1395 } 1396 if (!refcount_release(&hio->hio_countdown)) 1397 continue; 1398 pjdlog_debug(2, 1399 "remote_send: (%p) Moving request to the done queue.", 1400 hio); 1401 QUEUE_INSERT2(hio, done); 1402 } 1403 /* NOTREACHED */ 1404 return (NULL); 1405} 1406 1407/* 1408 * Thread receives answer from secondary node and passes it to ggate_send 1409 * thread. 1410 */ 1411static void * 1412remote_recv_thread(void *arg) 1413{ 1414 struct hast_resource *res = arg; 1415 struct g_gate_ctl_io *ggio; 1416 struct hio *hio; 1417 struct nv *nv; 1418 unsigned int ncomp; 1419 uint64_t seq; 1420 int error; 1421 1422 /* Remote component is 1 for now. */ 1423 ncomp = 1; 1424 1425 for (;;) { 1426 /* Wait until there is anything to receive. */ 1427 mtx_lock(&hio_recv_list_lock[ncomp]); 1428 while (TAILQ_EMPTY(&hio_recv_list[ncomp])) { 1429 pjdlog_debug(2, "remote_recv: No requests, waiting."); 1430 cv_wait(&hio_recv_list_cond[ncomp], 1431 &hio_recv_list_lock[ncomp]); 1432 } 1433 mtx_unlock(&hio_recv_list_lock[ncomp]); 1434 rw_rlock(&hio_remote_lock[ncomp]); 1435 if (!ISCONNECTED(res, ncomp)) { 1436 rw_unlock(&hio_remote_lock[ncomp]); 1437 /* 1438 * Connection is dead, so move all pending requests to 1439 * the done queue (one-by-one). 1440 */ 1441 mtx_lock(&hio_recv_list_lock[ncomp]); 1442 hio = TAILQ_FIRST(&hio_recv_list[ncomp]); 1443 assert(hio != NULL); 1444 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1445 hio_next[ncomp]); 1446 mtx_unlock(&hio_recv_list_lock[ncomp]); 1447 goto done_queue; 1448 } 1449 if (hast_proto_recv_hdr(res->hr_remotein, &nv) < 0) { 1450 pjdlog_errno(LOG_ERR, 1451 "Unable to receive reply header"); 1452 rw_unlock(&hio_remote_lock[ncomp]); 1453 remote_close(res, ncomp); 1454 continue; 1455 } 1456 rw_unlock(&hio_remote_lock[ncomp]); 1457 seq = nv_get_uint64(nv, "seq"); 1458 if (seq == 0) { 1459 pjdlog_error("Header contains no 'seq' field."); 1460 nv_free(nv); 1461 continue; 1462 } 1463 mtx_lock(&hio_recv_list_lock[ncomp]); 1464 TAILQ_FOREACH(hio, &hio_recv_list[ncomp], hio_next[ncomp]) { 1465 if (hio->hio_ggio.gctl_seq == seq) { 1466 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1467 hio_next[ncomp]); 1468 break; 1469 } 1470 } 1471 mtx_unlock(&hio_recv_list_lock[ncomp]); 1472 if (hio == NULL) { 1473 pjdlog_error("Found no request matching received 'seq' field (%ju).", 1474 (uintmax_t)seq); 1475 nv_free(nv); 1476 continue; 1477 } 1478 error = nv_get_int16(nv, "error"); 1479 if (error != 0) { 1480 /* Request failed on remote side. */ 1481 hio->hio_errors[ncomp] = error; 1482 reqlog(LOG_WARNING, 0, &hio->hio_ggio, 1483 "Remote request failed (%s): ", strerror(error)); 1484 nv_free(nv); 1485 goto done_queue; 1486 } 1487 ggio = &hio->hio_ggio; 1488 switch (ggio->gctl_cmd) { 1489 case BIO_READ: 1490 rw_rlock(&hio_remote_lock[ncomp]); 1491 if (!ISCONNECTED(res, ncomp)) { 1492 rw_unlock(&hio_remote_lock[ncomp]); 1493 nv_free(nv); 1494 goto done_queue; 1495 } 1496 if (hast_proto_recv_data(res, res->hr_remotein, nv, 1497 ggio->gctl_data, ggio->gctl_length) < 0) { 1498 hio->hio_errors[ncomp] = errno; 1499 pjdlog_errno(LOG_ERR, 1500 "Unable to receive reply data"); 1501 rw_unlock(&hio_remote_lock[ncomp]); 1502 nv_free(nv); 1503 remote_close(res, ncomp); 1504 goto done_queue; 1505 } 1506 rw_unlock(&hio_remote_lock[ncomp]); 1507 break; 1508 case BIO_WRITE: 1509 case BIO_DELETE: 1510 case BIO_FLUSH: 1511 break; 1512 default: 1513 assert(!"invalid condition"); 1514 abort(); 1515 } 1516 hio->hio_errors[ncomp] = 0; 1517 nv_free(nv); 1518done_queue: 1519 if (refcount_release(&hio->hio_countdown)) { 1520 if (ISSYNCREQ(hio)) { 1521 mtx_lock(&sync_lock); 1522 SYNCREQDONE(hio); 1523 mtx_unlock(&sync_lock); 1524 cv_signal(&sync_cond); 1525 } else { 1526 pjdlog_debug(2, 1527 "remote_recv: (%p) Moving request to the done queue.", 1528 hio); 1529 QUEUE_INSERT2(hio, done); 1530 } 1531 } 1532 } 1533 /* NOTREACHED */ 1534 return (NULL); 1535} 1536 1537/* 1538 * Thread sends answer to the kernel. 1539 */ 1540static void * 1541ggate_send_thread(void *arg) 1542{ 1543 struct hast_resource *res = arg; 1544 struct g_gate_ctl_io *ggio; 1545 struct hio *hio; 1546 unsigned int ii, ncomp, ncomps; 1547 1548 ncomps = HAST_NCOMPONENTS; 1549 1550 for (;;) { 1551 pjdlog_debug(2, "ggate_send: Taking request."); 1552 QUEUE_TAKE2(hio, done); 1553 pjdlog_debug(2, "ggate_send: (%p) Got request.", hio); 1554 ggio = &hio->hio_ggio; 1555 for (ii = 0; ii < ncomps; ii++) { 1556 if (hio->hio_errors[ii] == 0) { 1557 /* 1558 * One successful request is enough to declare 1559 * success. 1560 */ 1561 ggio->gctl_error = 0; 1562 break; 1563 } 1564 } 1565 if (ii == ncomps) { 1566 /* 1567 * None of the requests were successful. 1568 * Use first error. 1569 */ 1570 ggio->gctl_error = hio->hio_errors[0]; 1571 } 1572 if (ggio->gctl_error == 0 && ggio->gctl_cmd == BIO_WRITE) { 1573 mtx_lock(&res->hr_amp_lock); 1574 activemap_write_complete(res->hr_amp, 1575 ggio->gctl_offset, ggio->gctl_length); 1576 mtx_unlock(&res->hr_amp_lock); 1577 } 1578 if (ggio->gctl_cmd == BIO_WRITE) { 1579 /* 1580 * Unlock range we locked. 1581 */ 1582 mtx_lock(&range_lock); 1583 rangelock_del(range_regular, ggio->gctl_offset, 1584 ggio->gctl_length); 1585 if (range_sync_wait) 1586 cv_signal(&range_sync_cond); 1587 mtx_unlock(&range_lock); 1588 /* 1589 * Bump local count if this is first write after 1590 * connection failure with remote node. 1591 */ 1592 ncomp = 1; 1593 rw_rlock(&hio_remote_lock[ncomp]); 1594 if (!ISCONNECTED(res, ncomp)) { 1595 mtx_lock(&metadata_lock); 1596 if (res->hr_primary_localcnt == 1597 res->hr_secondary_remotecnt) { 1598 res->hr_primary_localcnt++; 1599 pjdlog_debug(1, 1600 "Increasing localcnt to %ju.", 1601 (uintmax_t)res->hr_primary_localcnt); 1602 (void)metadata_write(res); 1603 } 1604 mtx_unlock(&metadata_lock); 1605 } 1606 rw_unlock(&hio_remote_lock[ncomp]); 1607 } 1608 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DONE, ggio) < 0) 1609 primary_exit(EX_OSERR, "G_GATE_CMD_DONE failed"); 1610 pjdlog_debug(2, 1611 "ggate_send: (%p) Moving request to the free queue.", hio); 1612 QUEUE_INSERT2(hio, free); 1613 } 1614 /* NOTREACHED */ 1615 return (NULL); 1616} 1617 1618/* 1619 * Thread synchronize local and remote components. 1620 */ 1621static void * 1622sync_thread(void *arg __unused) 1623{ 1624 struct hast_resource *res = arg; 1625 struct hio *hio; 1626 struct g_gate_ctl_io *ggio; 1627 unsigned int ii, ncomp, ncomps; 1628 off_t offset, length, synced; 1629 bool dorewind; 1630 int syncext; 1631 1632 ncomps = HAST_NCOMPONENTS; 1633 dorewind = true; 1634 synced = 0; 1635 offset = -1; 1636 1637 for (;;) { 1638 mtx_lock(&sync_lock); 1639 if (offset >= 0 && !sync_inprogress) { 1640 pjdlog_info("Synchronization interrupted. " 1641 "%jd bytes synchronized so far.", 1642 (intmax_t)synced); 1643 event_send(res, EVENT_SYNCINTR); 1644 } 1645 while (!sync_inprogress) { 1646 dorewind = true; 1647 synced = 0; 1648 cv_wait(&sync_cond, &sync_lock); 1649 } 1650 mtx_unlock(&sync_lock); 1651 /* 1652 * Obtain offset at which we should synchronize. 1653 * Rewind synchronization if needed. 1654 */ 1655 mtx_lock(&res->hr_amp_lock); 1656 if (dorewind) 1657 activemap_sync_rewind(res->hr_amp); 1658 offset = activemap_sync_offset(res->hr_amp, &length, &syncext); 1659 if (syncext != -1) { 1660 /* 1661 * We synchronized entire syncext extent, we can mark 1662 * it as clean now. 1663 */ 1664 if (activemap_extent_complete(res->hr_amp, syncext)) 1665 (void)hast_activemap_flush(res); 1666 } 1667 mtx_unlock(&res->hr_amp_lock); 1668 if (dorewind) { 1669 dorewind = false; 1670 if (offset < 0) 1671 pjdlog_info("Nodes are in sync."); 1672 else { 1673 pjdlog_info("Synchronization started. %ju bytes to go.", 1674 (uintmax_t)(res->hr_extentsize * 1675 activemap_ndirty(res->hr_amp))); 1676 event_send(res, EVENT_SYNCSTART); 1677 } 1678 } 1679 if (offset < 0) { 1680 sync_stop(); 1681 pjdlog_debug(1, "Nothing to synchronize."); 1682 /* 1683 * Synchronization complete, make both localcnt and 1684 * remotecnt equal. 1685 */ 1686 ncomp = 1; 1687 rw_rlock(&hio_remote_lock[ncomp]); 1688 if (ISCONNECTED(res, ncomp)) { 1689 if (synced > 0) { 1690 pjdlog_info("Synchronization complete. " 1691 "%jd bytes synchronized.", 1692 (intmax_t)synced); 1693 event_send(res, EVENT_SYNCDONE); 1694 } 1695 mtx_lock(&metadata_lock); 1696 res->hr_syncsrc = HAST_SYNCSRC_UNDEF; 1697 res->hr_primary_localcnt = 1698 res->hr_secondary_localcnt; 1699 res->hr_primary_remotecnt = 1700 res->hr_secondary_remotecnt; 1701 pjdlog_debug(1, 1702 "Setting localcnt to %ju and remotecnt to %ju.", 1703 (uintmax_t)res->hr_primary_localcnt, 1704 (uintmax_t)res->hr_secondary_localcnt); 1705 (void)metadata_write(res); 1706 mtx_unlock(&metadata_lock); 1707 } 1708 rw_unlock(&hio_remote_lock[ncomp]); 1709 continue; 1710 } 1711 pjdlog_debug(2, "sync: Taking free request."); 1712 QUEUE_TAKE2(hio, free); 1713 pjdlog_debug(2, "sync: (%p) Got free request.", hio); 1714 /* 1715 * Lock the range we are going to synchronize. We don't want 1716 * race where someone writes between our read and write. 1717 */ 1718 for (;;) { 1719 mtx_lock(&range_lock); 1720 if (rangelock_islocked(range_regular, offset, length)) { 1721 pjdlog_debug(2, 1722 "sync: Range offset=%jd length=%jd locked.", 1723 (intmax_t)offset, (intmax_t)length); 1724 range_sync_wait = true; 1725 cv_wait(&range_sync_cond, &range_lock); 1726 range_sync_wait = false; 1727 mtx_unlock(&range_lock); 1728 continue; 1729 } 1730 if (rangelock_add(range_sync, offset, length) < 0) { 1731 mtx_unlock(&range_lock); 1732 pjdlog_debug(2, 1733 "sync: Range offset=%jd length=%jd is already locked, waiting.", 1734 (intmax_t)offset, (intmax_t)length); 1735 sleep(1); 1736 continue; 1737 } 1738 mtx_unlock(&range_lock); 1739 break; 1740 } 1741 /* 1742 * First read the data from synchronization source. 1743 */ 1744 SYNCREQ(hio); 1745 ggio = &hio->hio_ggio; 1746 ggio->gctl_cmd = BIO_READ; 1747 ggio->gctl_offset = offset; 1748 ggio->gctl_length = length; 1749 ggio->gctl_error = 0; 1750 for (ii = 0; ii < ncomps; ii++) 1751 hio->hio_errors[ii] = EINVAL; 1752 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 1753 hio); 1754 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 1755 hio); 1756 mtx_lock(&metadata_lock); 1757 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1758 /* 1759 * This range is up-to-date on local component, 1760 * so handle request locally. 1761 */ 1762 /* Local component is 0 for now. */ 1763 ncomp = 0; 1764 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 1765 assert(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 1766 /* 1767 * This range is out-of-date on local component, 1768 * so send request to the remote node. 1769 */ 1770 /* Remote component is 1 for now. */ 1771 ncomp = 1; 1772 } 1773 mtx_unlock(&metadata_lock); 1774 refcount_init(&hio->hio_countdown, 1); 1775 QUEUE_INSERT1(hio, send, ncomp); 1776 1777 /* 1778 * Let's wait for READ to finish. 1779 */ 1780 mtx_lock(&sync_lock); 1781 while (!ISSYNCREQDONE(hio)) 1782 cv_wait(&sync_cond, &sync_lock); 1783 mtx_unlock(&sync_lock); 1784 1785 if (hio->hio_errors[ncomp] != 0) { 1786 pjdlog_error("Unable to read synchronization data: %s.", 1787 strerror(hio->hio_errors[ncomp])); 1788 goto free_queue; 1789 } 1790 1791 /* 1792 * We read the data from synchronization source, now write it 1793 * to synchronization target. 1794 */ 1795 SYNCREQ(hio); 1796 ggio->gctl_cmd = BIO_WRITE; 1797 for (ii = 0; ii < ncomps; ii++) 1798 hio->hio_errors[ii] = EINVAL; 1799 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 1800 hio); 1801 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 1802 hio); 1803 mtx_lock(&metadata_lock); 1804 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1805 /* 1806 * This range is up-to-date on local component, 1807 * so we update remote component. 1808 */ 1809 /* Remote component is 1 for now. */ 1810 ncomp = 1; 1811 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 1812 assert(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 1813 /* 1814 * This range is out-of-date on local component, 1815 * so we update it. 1816 */ 1817 /* Local component is 0 for now. */ 1818 ncomp = 0; 1819 } 1820 mtx_unlock(&metadata_lock); 1821 1822 pjdlog_debug(2, "sync: (%p) Moving request to the send queues.", 1823 hio); 1824 refcount_init(&hio->hio_countdown, 1); 1825 QUEUE_INSERT1(hio, send, ncomp); 1826 1827 /* 1828 * Let's wait for WRITE to finish. 1829 */ 1830 mtx_lock(&sync_lock); 1831 while (!ISSYNCREQDONE(hio)) 1832 cv_wait(&sync_cond, &sync_lock); 1833 mtx_unlock(&sync_lock); 1834 1835 if (hio->hio_errors[ncomp] != 0) { 1836 pjdlog_error("Unable to write synchronization data: %s.", 1837 strerror(hio->hio_errors[ncomp])); 1838 goto free_queue; 1839 } 1840 1841 synced += length; 1842free_queue: 1843 mtx_lock(&range_lock); 1844 rangelock_del(range_sync, offset, length); 1845 if (range_regular_wait) 1846 cv_signal(&range_regular_cond); 1847 mtx_unlock(&range_lock); 1848 pjdlog_debug(2, "sync: (%p) Moving request to the free queue.", 1849 hio); 1850 QUEUE_INSERT2(hio, free); 1851 } 1852 /* NOTREACHED */ 1853 return (NULL); 1854} 1855 1856void 1857primary_config_reload(struct hast_resource *res, struct nv *nv) 1858{ 1859 unsigned int ii, ncomps; 1860 int modified, vint; 1861 const char *vstr; 1862 1863 pjdlog_info("Reloading configuration..."); 1864 1865 assert(res->hr_role == HAST_ROLE_PRIMARY); 1866 assert(gres == res); 1867 nv_assert(nv, "remoteaddr"); 1868 nv_assert(nv, "replication"); 1869 nv_assert(nv, "timeout"); 1870 nv_assert(nv, "exec"); 1871 1872 ncomps = HAST_NCOMPONENTS; 1873 1874#define MODIFIED_REMOTEADDR 0x1 1875#define MODIFIED_REPLICATION 0x2 1876#define MODIFIED_TIMEOUT 0x4 1877#define MODIFIED_EXEC 0x8 1878 modified = 0; 1879 1880 vstr = nv_get_string(nv, "remoteaddr"); 1881 if (strcmp(gres->hr_remoteaddr, vstr) != 0) { 1882 /* 1883 * Don't copy res->hr_remoteaddr to gres just yet. 1884 * We want remote_close() to log disconnect from the old 1885 * addresses, not from the new ones. 1886 */ 1887 modified |= MODIFIED_REMOTEADDR; 1888 } 1889 vint = nv_get_int32(nv, "replication"); 1890 if (gres->hr_replication != vint) { 1891 gres->hr_replication = vint; 1892 modified |= MODIFIED_REPLICATION; 1893 } 1894 vint = nv_get_int32(nv, "timeout"); 1895 if (gres->hr_timeout != vint) { 1896 gres->hr_timeout = vint; 1897 modified |= MODIFIED_TIMEOUT; 1898 } 1899 vstr = nv_get_string(nv, "exec"); 1900 if (strcmp(gres->hr_exec, vstr) != 0) { 1901 strlcpy(gres->hr_exec, vstr, sizeof(gres->hr_exec)); 1902 modified |= MODIFIED_EXEC; 1903 } 1904 1905 /* 1906 * If only timeout was modified we only need to change it without 1907 * reconnecting. 1908 */ 1909 if (modified == MODIFIED_TIMEOUT) { 1910 for (ii = 0; ii < ncomps; ii++) { 1911 if (!ISREMOTE(ii)) 1912 continue; 1913 rw_rlock(&hio_remote_lock[ii]); 1914 if (!ISCONNECTED(gres, ii)) { 1915 rw_unlock(&hio_remote_lock[ii]); 1916 continue; 1917 } 1918 rw_unlock(&hio_remote_lock[ii]); 1919 if (proto_timeout(gres->hr_remotein, 1920 gres->hr_timeout) < 0) { 1921 pjdlog_errno(LOG_WARNING, 1922 "Unable to set connection timeout"); 1923 } 1924 if (proto_timeout(gres->hr_remoteout, 1925 gres->hr_timeout) < 0) { 1926 pjdlog_errno(LOG_WARNING, 1927 "Unable to set connection timeout"); 1928 } 1929 } 1930 } else if ((modified & 1931 (MODIFIED_REMOTEADDR | MODIFIED_REPLICATION)) != 0) { 1932 for (ii = 0; ii < ncomps; ii++) { 1933 if (!ISREMOTE(ii)) 1934 continue; 1935 remote_close(gres, ii); 1936 } 1937 if (modified & MODIFIED_REMOTEADDR) { 1938 vstr = nv_get_string(nv, "remoteaddr"); 1939 strlcpy(gres->hr_remoteaddr, vstr, 1940 sizeof(gres->hr_remoteaddr)); 1941 } 1942 } 1943#undef MODIFIED_REMOTEADDR 1944#undef MODIFIED_REPLICATION 1945#undef MODIFIED_TIMEOUT 1946#undef MODIFIED_EXEC 1947 1948 pjdlog_info("Configuration reloaded successfully."); 1949} 1950 1951static void 1952guard_one(struct hast_resource *res, unsigned int ncomp) 1953{ 1954 struct proto_conn *in, *out; 1955 1956 if (!ISREMOTE(ncomp)) 1957 return; 1958 1959 rw_rlock(&hio_remote_lock[ncomp]); 1960 1961 if (!real_remote(res)) { 1962 rw_unlock(&hio_remote_lock[ncomp]); 1963 return; 1964 } 1965 1966 if (ISCONNECTED(res, ncomp)) { 1967 assert(res->hr_remotein != NULL); 1968 assert(res->hr_remoteout != NULL); 1969 rw_unlock(&hio_remote_lock[ncomp]); 1970 pjdlog_debug(2, "remote_guard: Connection to %s is ok.", 1971 res->hr_remoteaddr); 1972 return; 1973 } 1974 1975 assert(res->hr_remotein == NULL); 1976 assert(res->hr_remoteout == NULL); 1977 /* 1978 * Upgrade the lock. It doesn't have to be atomic as no other thread 1979 * can change connection status from disconnected to connected. 1980 */ 1981 rw_unlock(&hio_remote_lock[ncomp]); 1982 pjdlog_debug(2, "remote_guard: Reconnecting to %s.", 1983 res->hr_remoteaddr); 1984 in = out = NULL; 1985 if (init_remote(res, &in, &out)) { 1986 rw_wlock(&hio_remote_lock[ncomp]); 1987 assert(res->hr_remotein == NULL); 1988 assert(res->hr_remoteout == NULL); 1989 assert(in != NULL && out != NULL); 1990 res->hr_remotein = in; 1991 res->hr_remoteout = out; 1992 rw_unlock(&hio_remote_lock[ncomp]); 1993 pjdlog_info("Successfully reconnected to %s.", 1994 res->hr_remoteaddr); 1995 sync_start(); 1996 } else { 1997 /* Both connections should be NULL. */ 1998 assert(res->hr_remotein == NULL); 1999 assert(res->hr_remoteout == NULL); 2000 assert(in == NULL && out == NULL); 2001 pjdlog_debug(2, "remote_guard: Reconnect to %s failed.", 2002 res->hr_remoteaddr); 2003 } 2004} 2005 2006/* 2007 * Thread guards remote connections and reconnects when needed, handles 2008 * signals, etc. 2009 */ 2010static void * 2011guard_thread(void *arg) 2012{ 2013 struct hast_resource *res = arg; 2014 unsigned int ii, ncomps; 2015 struct timespec timeout; 2016 time_t lastcheck, now; 2017 sigset_t mask; 2018 int signo; 2019 2020 ncomps = HAST_NCOMPONENTS; 2021 lastcheck = time(NULL); 2022 2023 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 2024 PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0); 2025 PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0); 2026 2027 timeout.tv_sec = RETRY_SLEEP; 2028 timeout.tv_nsec = 0; 2029 signo = -1; 2030 2031 for (;;) { 2032 switch (signo) { 2033 case SIGINT: 2034 case SIGTERM: 2035 sigexit_received = true; 2036 primary_exitx(EX_OK, 2037 "Termination signal received, exiting."); 2038 break; 2039 default: 2040 break; 2041 } 2042 2043 pjdlog_debug(2, "remote_guard: Checking connections."); 2044 now = time(NULL); 2045 if (lastcheck + RETRY_SLEEP <= now) { 2046 for (ii = 0; ii < ncomps; ii++) 2047 guard_one(res, ii); 2048 lastcheck = now; 2049 } 2050 signo = sigtimedwait(&mask, NULL, &timeout); 2051 } 2052 /* NOTREACHED */ 2053 return (NULL); 2054} 2055