1 /*- 2 * Copyright (c) 2009 The FreeBSD Foundation 3 * Copyright (c) 2010-2011 Pawel Jakub Dawidek <pawel@dawidek.net> 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("$FreeBSD$"); 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 <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <libgeom.h> 47 #include <pthread.h> 48 #include <signal.h> 49 #include <stdint.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <sysexits.h> 53 #include <unistd.h> 54 55 #include <activemap.h> 56 #include <nv.h> 57 #include <rangelock.h> 58 59 #include "control.h" 60 #include "event.h" 61 #include "hast.h" 62 #include "hast_proto.h" 63 #include "hastd.h" 64 #include "hooks.h" 65 #include "metadata.h" 66 #include "proto.h" 67 #include "pjdlog.h" 68 #include "subr.h" 69 #include "synch.h" 70 71 /* The is only one remote component for now. */ 72 #define ISREMOTE(no) ((no) == 1) 73 74 struct hio { 75 /* 76 * Number of components we are still waiting for. 77 * When this field goes to 0, we can send the request back to the 78 * kernel. Each component has to decrease this counter by one 79 * even on failure. 80 */ 81 unsigned int hio_countdown; 82 /* 83 * Each component has a place to store its own error. 84 * Once the request is handled by all components we can decide if the 85 * request overall is successful or not. 86 */ 87 int *hio_errors; 88 /* 89 * Structure used to communicate with GEOM Gate class. 90 */ 91 struct g_gate_ctl_io hio_ggio; 92 TAILQ_ENTRY(hio) *hio_next; 93 }; 94 #define hio_free_next hio_next[0] 95 #define hio_done_next hio_next[0] 96 97 /* 98 * Free list holds unused structures. When free list is empty, we have to wait 99 * until some in-progress requests are freed. 100 */ 101 static TAILQ_HEAD(, hio) hio_free_list; 102 static pthread_mutex_t hio_free_list_lock; 103 static pthread_cond_t hio_free_list_cond; 104 /* 105 * There is one send list for every component. One requests is placed on all 106 * send lists - each component gets the same request, but each component is 107 * responsible for managing his own send list. 108 */ 109 static TAILQ_HEAD(, hio) *hio_send_list; 110 static pthread_mutex_t *hio_send_list_lock; 111 static pthread_cond_t *hio_send_list_cond; 112 /* 113 * There is one recv list for every component, although local components don't 114 * use recv lists as local requests are done synchronously. 115 */ 116 static TAILQ_HEAD(, hio) *hio_recv_list; 117 static pthread_mutex_t *hio_recv_list_lock; 118 static pthread_cond_t *hio_recv_list_cond; 119 /* 120 * Request is placed on done list by the slowest component (the one that 121 * decreased hio_countdown from 1 to 0). 122 */ 123 static TAILQ_HEAD(, hio) hio_done_list; 124 static pthread_mutex_t hio_done_list_lock; 125 static pthread_cond_t hio_done_list_cond; 126 /* 127 * Structure below are for interaction with sync thread. 128 */ 129 static bool sync_inprogress; 130 static pthread_mutex_t sync_lock; 131 static pthread_cond_t sync_cond; 132 /* 133 * The lock below allows to synchornize access to remote connections. 134 */ 135 static pthread_rwlock_t *hio_remote_lock; 136 137 /* 138 * Lock to synchronize metadata updates. Also synchronize access to 139 * hr_primary_localcnt and hr_primary_remotecnt fields. 140 */ 141 static pthread_mutex_t metadata_lock; 142 143 /* 144 * Maximum number of outstanding I/O requests. 145 */ 146 #define HAST_HIO_MAX 256 147 /* 148 * Number of components. At this point there are only two components: local 149 * and remote, but in the future it might be possible to use multiple local 150 * and remote components. 151 */ 152 #define HAST_NCOMPONENTS 2 153 154 #define ISCONNECTED(res, no) \ 155 ((res)->hr_remotein != NULL && (res)->hr_remoteout != NULL) 156 157 #define QUEUE_INSERT1(hio, name, ncomp) do { \ 158 bool _wakeup; \ 159 \ 160 mtx_lock(&hio_##name##_list_lock[(ncomp)]); \ 161 _wakeup = TAILQ_EMPTY(&hio_##name##_list[(ncomp)]); \ 162 TAILQ_INSERT_TAIL(&hio_##name##_list[(ncomp)], (hio), \ 163 hio_next[(ncomp)]); \ 164 mtx_unlock(&hio_##name##_list_lock[ncomp]); \ 165 if (_wakeup) \ 166 cv_signal(&hio_##name##_list_cond[(ncomp)]); \ 167 } while (0) 168 #define QUEUE_INSERT2(hio, name) do { \ 169 bool _wakeup; \ 170 \ 171 mtx_lock(&hio_##name##_list_lock); \ 172 _wakeup = TAILQ_EMPTY(&hio_##name##_list); \ 173 TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_##name##_next);\ 174 mtx_unlock(&hio_##name##_list_lock); \ 175 if (_wakeup) \ 176 cv_signal(&hio_##name##_list_cond); \ 177 } while (0) 178 #define QUEUE_TAKE1(hio, name, ncomp, timeout) do { \ 179 bool _last; \ 180 \ 181 mtx_lock(&hio_##name##_list_lock[(ncomp)]); \ 182 _last = false; \ 183 while (((hio) = TAILQ_FIRST(&hio_##name##_list[(ncomp)])) == NULL && !_last) { \ 184 cv_timedwait(&hio_##name##_list_cond[(ncomp)], \ 185 &hio_##name##_list_lock[(ncomp)], (timeout)); \ 186 if ((timeout) != 0) \ 187 _last = true; \ 188 } \ 189 if (hio != NULL) { \ 190 TAILQ_REMOVE(&hio_##name##_list[(ncomp)], (hio), \ 191 hio_next[(ncomp)]); \ 192 } \ 193 mtx_unlock(&hio_##name##_list_lock[(ncomp)]); \ 194 } while (0) 195 #define QUEUE_TAKE2(hio, name) do { \ 196 mtx_lock(&hio_##name##_list_lock); \ 197 while (((hio) = TAILQ_FIRST(&hio_##name##_list)) == NULL) { \ 198 cv_wait(&hio_##name##_list_cond, \ 199 &hio_##name##_list_lock); \ 200 } \ 201 TAILQ_REMOVE(&hio_##name##_list, (hio), hio_##name##_next); \ 202 mtx_unlock(&hio_##name##_list_lock); \ 203 } while (0) 204 205 #define SYNCREQ(hio) do { \ 206 (hio)->hio_ggio.gctl_unit = -1; \ 207 (hio)->hio_ggio.gctl_seq = 1; \ 208 } while (0) 209 #define ISSYNCREQ(hio) ((hio)->hio_ggio.gctl_unit == -1) 210 #define SYNCREQDONE(hio) do { (hio)->hio_ggio.gctl_unit = -2; } while (0) 211 #define ISSYNCREQDONE(hio) ((hio)->hio_ggio.gctl_unit == -2) 212 213 static struct hast_resource *gres; 214 215 static pthread_mutex_t range_lock; 216 static struct rangelocks *range_regular; 217 static bool range_regular_wait; 218 static pthread_cond_t range_regular_cond; 219 static struct rangelocks *range_sync; 220 static bool range_sync_wait; 221 static pthread_cond_t range_sync_cond; 222 static bool fullystarted; 223 224 static void *ggate_recv_thread(void *arg); 225 static void *local_send_thread(void *arg); 226 static void *remote_send_thread(void *arg); 227 static void *remote_recv_thread(void *arg); 228 static void *ggate_send_thread(void *arg); 229 static void *sync_thread(void *arg); 230 static void *guard_thread(void *arg); 231 232 static void 233 cleanup(struct hast_resource *res) 234 { 235 int rerrno; 236 237 /* Remember errno. */ 238 rerrno = errno; 239 240 /* Destroy ggate provider if we created one. */ 241 if (res->hr_ggateunit >= 0) { 242 struct g_gate_ctl_destroy ggiod; 243 244 bzero(&ggiod, sizeof(ggiod)); 245 ggiod.gctl_version = G_GATE_VERSION; 246 ggiod.gctl_unit = res->hr_ggateunit; 247 ggiod.gctl_force = 1; 248 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DESTROY, &ggiod) < 0) { 249 pjdlog_errno(LOG_WARNING, 250 "Unable to destroy hast/%s device", 251 res->hr_provname); 252 } 253 res->hr_ggateunit = -1; 254 } 255 256 /* Restore errno. */ 257 errno = rerrno; 258 } 259 260 static __dead2 void 261 primary_exit(int exitcode, const char *fmt, ...) 262 { 263 va_list ap; 264 265 PJDLOG_ASSERT(exitcode != EX_OK); 266 va_start(ap, fmt); 267 pjdlogv_errno(LOG_ERR, fmt, ap); 268 va_end(ap); 269 cleanup(gres); 270 exit(exitcode); 271 } 272 273 static __dead2 void 274 primary_exitx(int exitcode, const char *fmt, ...) 275 { 276 va_list ap; 277 278 va_start(ap, fmt); 279 pjdlogv(exitcode == EX_OK ? LOG_INFO : LOG_ERR, fmt, ap); 280 va_end(ap); 281 cleanup(gres); 282 exit(exitcode); 283 } 284 285 static int 286 hast_activemap_flush(struct hast_resource *res) 287 { 288 const unsigned char *buf; 289 size_t size; 290 291 buf = activemap_bitmap(res->hr_amp, &size); 292 PJDLOG_ASSERT(buf != NULL); 293 PJDLOG_ASSERT((size % res->hr_local_sectorsize) == 0); 294 if (pwrite(res->hr_localfd, buf, size, METADATA_SIZE) != 295 (ssize_t)size) { 296 pjdlog_errno(LOG_ERR, "Unable to flush activemap to disk"); 297 return (-1); 298 } 299 if (res->hr_metaflush == 1 && g_flush(res->hr_localfd) == -1) { 300 if (errno == EOPNOTSUPP) { 301 pjdlog_warning("The %s provider doesn't support flushing write cache. Disabling it.", 302 res->hr_localpath); 303 res->hr_metaflush = 0; 304 } else { 305 pjdlog_errno(LOG_ERR, 306 "Unable to flush disk cache on activemap update"); 307 return (-1); 308 } 309 } 310 return (0); 311 } 312 313 static bool 314 real_remote(const struct hast_resource *res) 315 { 316 317 return (strcmp(res->hr_remoteaddr, "none") != 0); 318 } 319 320 static void 321 init_environment(struct hast_resource *res __unused) 322 { 323 struct hio *hio; 324 unsigned int ii, ncomps; 325 326 /* 327 * In the future it might be per-resource value. 328 */ 329 ncomps = HAST_NCOMPONENTS; 330 331 /* 332 * Allocate memory needed by lists. 333 */ 334 hio_send_list = malloc(sizeof(hio_send_list[0]) * ncomps); 335 if (hio_send_list == NULL) { 336 primary_exitx(EX_TEMPFAIL, 337 "Unable to allocate %zu bytes of memory for send lists.", 338 sizeof(hio_send_list[0]) * ncomps); 339 } 340 hio_send_list_lock = malloc(sizeof(hio_send_list_lock[0]) * ncomps); 341 if (hio_send_list_lock == NULL) { 342 primary_exitx(EX_TEMPFAIL, 343 "Unable to allocate %zu bytes of memory for send list locks.", 344 sizeof(hio_send_list_lock[0]) * ncomps); 345 } 346 hio_send_list_cond = malloc(sizeof(hio_send_list_cond[0]) * ncomps); 347 if (hio_send_list_cond == NULL) { 348 primary_exitx(EX_TEMPFAIL, 349 "Unable to allocate %zu bytes of memory for send list condition variables.", 350 sizeof(hio_send_list_cond[0]) * ncomps); 351 } 352 hio_recv_list = malloc(sizeof(hio_recv_list[0]) * ncomps); 353 if (hio_recv_list == NULL) { 354 primary_exitx(EX_TEMPFAIL, 355 "Unable to allocate %zu bytes of memory for recv lists.", 356 sizeof(hio_recv_list[0]) * ncomps); 357 } 358 hio_recv_list_lock = malloc(sizeof(hio_recv_list_lock[0]) * ncomps); 359 if (hio_recv_list_lock == NULL) { 360 primary_exitx(EX_TEMPFAIL, 361 "Unable to allocate %zu bytes of memory for recv list locks.", 362 sizeof(hio_recv_list_lock[0]) * ncomps); 363 } 364 hio_recv_list_cond = malloc(sizeof(hio_recv_list_cond[0]) * ncomps); 365 if (hio_recv_list_cond == NULL) { 366 primary_exitx(EX_TEMPFAIL, 367 "Unable to allocate %zu bytes of memory for recv list condition variables.", 368 sizeof(hio_recv_list_cond[0]) * ncomps); 369 } 370 hio_remote_lock = malloc(sizeof(hio_remote_lock[0]) * ncomps); 371 if (hio_remote_lock == NULL) { 372 primary_exitx(EX_TEMPFAIL, 373 "Unable to allocate %zu bytes of memory for remote connections locks.", 374 sizeof(hio_remote_lock[0]) * ncomps); 375 } 376 377 /* 378 * Initialize lists, their locks and theirs condition variables. 379 */ 380 TAILQ_INIT(&hio_free_list); 381 mtx_init(&hio_free_list_lock); 382 cv_init(&hio_free_list_cond); 383 for (ii = 0; ii < HAST_NCOMPONENTS; ii++) { 384 TAILQ_INIT(&hio_send_list[ii]); 385 mtx_init(&hio_send_list_lock[ii]); 386 cv_init(&hio_send_list_cond[ii]); 387 TAILQ_INIT(&hio_recv_list[ii]); 388 mtx_init(&hio_recv_list_lock[ii]); 389 cv_init(&hio_recv_list_cond[ii]); 390 rw_init(&hio_remote_lock[ii]); 391 } 392 TAILQ_INIT(&hio_done_list); 393 mtx_init(&hio_done_list_lock); 394 cv_init(&hio_done_list_cond); 395 mtx_init(&metadata_lock); 396 397 /* 398 * Allocate requests pool and initialize requests. 399 */ 400 for (ii = 0; ii < HAST_HIO_MAX; ii++) { 401 hio = malloc(sizeof(*hio)); 402 if (hio == NULL) { 403 primary_exitx(EX_TEMPFAIL, 404 "Unable to allocate %zu bytes of memory for hio request.", 405 sizeof(*hio)); 406 } 407 hio->hio_countdown = 0; 408 hio->hio_errors = malloc(sizeof(hio->hio_errors[0]) * ncomps); 409 if (hio->hio_errors == NULL) { 410 primary_exitx(EX_TEMPFAIL, 411 "Unable allocate %zu bytes of memory for hio errors.", 412 sizeof(hio->hio_errors[0]) * ncomps); 413 } 414 hio->hio_next = malloc(sizeof(hio->hio_next[0]) * ncomps); 415 if (hio->hio_next == NULL) { 416 primary_exitx(EX_TEMPFAIL, 417 "Unable allocate %zu bytes of memory for hio_next field.", 418 sizeof(hio->hio_next[0]) * ncomps); 419 } 420 hio->hio_ggio.gctl_version = G_GATE_VERSION; 421 hio->hio_ggio.gctl_data = malloc(MAXPHYS); 422 if (hio->hio_ggio.gctl_data == NULL) { 423 primary_exitx(EX_TEMPFAIL, 424 "Unable to allocate %zu bytes of memory for gctl_data.", 425 MAXPHYS); 426 } 427 hio->hio_ggio.gctl_length = MAXPHYS; 428 hio->hio_ggio.gctl_error = 0; 429 TAILQ_INSERT_HEAD(&hio_free_list, hio, hio_free_next); 430 } 431 } 432 433 static bool 434 init_resuid(struct hast_resource *res) 435 { 436 437 mtx_lock(&metadata_lock); 438 if (res->hr_resuid != 0) { 439 mtx_unlock(&metadata_lock); 440 return (false); 441 } else { 442 /* Initialize unique resource identifier. */ 443 arc4random_buf(&res->hr_resuid, sizeof(res->hr_resuid)); 444 mtx_unlock(&metadata_lock); 445 if (metadata_write(res) < 0) 446 exit(EX_NOINPUT); 447 return (true); 448 } 449 } 450 451 static void 452 init_local(struct hast_resource *res) 453 { 454 unsigned char *buf; 455 size_t mapsize; 456 457 if (metadata_read(res, true) < 0) 458 exit(EX_NOINPUT); 459 mtx_init(&res->hr_amp_lock); 460 if (activemap_init(&res->hr_amp, res->hr_datasize, res->hr_extentsize, 461 res->hr_local_sectorsize, res->hr_keepdirty) < 0) { 462 primary_exit(EX_TEMPFAIL, "Unable to create activemap"); 463 } 464 mtx_init(&range_lock); 465 cv_init(&range_regular_cond); 466 if (rangelock_init(&range_regular) < 0) 467 primary_exit(EX_TEMPFAIL, "Unable to create regular range lock"); 468 cv_init(&range_sync_cond); 469 if (rangelock_init(&range_sync) < 0) 470 primary_exit(EX_TEMPFAIL, "Unable to create sync range lock"); 471 mapsize = activemap_ondisk_size(res->hr_amp); 472 buf = calloc(1, mapsize); 473 if (buf == NULL) { 474 primary_exitx(EX_TEMPFAIL, 475 "Unable to allocate buffer for activemap."); 476 } 477 if (pread(res->hr_localfd, buf, mapsize, METADATA_SIZE) != 478 (ssize_t)mapsize) { 479 primary_exit(EX_NOINPUT, "Unable to read activemap"); 480 } 481 activemap_copyin(res->hr_amp, buf, mapsize); 482 free(buf); 483 if (res->hr_resuid != 0) 484 return; 485 /* 486 * We're using provider for the first time. Initialize local and remote 487 * counters. We don't initialize resuid here, as we want to do it just 488 * in time. The reason for this is that we want to inform secondary 489 * that there were no writes yet, so there is no need to synchronize 490 * anything. 491 */ 492 res->hr_primary_localcnt = 0; 493 res->hr_primary_remotecnt = 0; 494 if (metadata_write(res) < 0) 495 exit(EX_NOINPUT); 496 } 497 498 static int 499 primary_connect(struct hast_resource *res, struct proto_conn **connp) 500 { 501 struct proto_conn *conn; 502 int16_t val; 503 504 val = 1; 505 if (proto_send(res->hr_conn, &val, sizeof(val)) < 0) { 506 primary_exit(EX_TEMPFAIL, 507 "Unable to send connection request to parent"); 508 } 509 if (proto_recv(res->hr_conn, &val, sizeof(val)) < 0) { 510 primary_exit(EX_TEMPFAIL, 511 "Unable to receive reply to connection request from parent"); 512 } 513 if (val != 0) { 514 errno = val; 515 pjdlog_errno(LOG_WARNING, "Unable to connect to %s", 516 res->hr_remoteaddr); 517 return (-1); 518 } 519 if (proto_connection_recv(res->hr_conn, true, &conn) < 0) { 520 primary_exit(EX_TEMPFAIL, 521 "Unable to receive connection from parent"); 522 } 523 if (proto_connect_wait(conn, res->hr_timeout) < 0) { 524 pjdlog_errno(LOG_WARNING, "Unable to connect to %s", 525 res->hr_remoteaddr); 526 proto_close(conn); 527 return (-1); 528 } 529 /* Error in setting timeout is not critical, but why should it fail? */ 530 if (proto_timeout(conn, res->hr_timeout) < 0) 531 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 532 533 *connp = conn; 534 535 return (0); 536 } 537 538 static int 539 init_remote(struct hast_resource *res, struct proto_conn **inp, 540 struct proto_conn **outp) 541 { 542 struct proto_conn *in, *out; 543 struct nv *nvout, *nvin; 544 const unsigned char *token; 545 unsigned char *map; 546 const char *errmsg; 547 int32_t extentsize; 548 int64_t datasize; 549 uint32_t mapsize; 550 size_t size; 551 int error; 552 553 PJDLOG_ASSERT((inp == NULL && outp == NULL) || (inp != NULL && outp != NULL)); 554 PJDLOG_ASSERT(real_remote(res)); 555 556 in = out = NULL; 557 errmsg = NULL; 558 559 if (primary_connect(res, &out) == -1) 560 return (ECONNREFUSED); 561 562 error = ECONNABORTED; 563 564 /* 565 * First handshake step. 566 * Setup outgoing connection with remote node. 567 */ 568 nvout = nv_alloc(); 569 nv_add_string(nvout, res->hr_name, "resource"); 570 if (nv_error(nvout) != 0) { 571 pjdlog_common(LOG_WARNING, 0, nv_error(nvout), 572 "Unable to allocate header for connection with %s", 573 res->hr_remoteaddr); 574 nv_free(nvout); 575 goto close; 576 } 577 if (hast_proto_send(res, out, nvout, NULL, 0) < 0) { 578 pjdlog_errno(LOG_WARNING, 579 "Unable to send handshake header to %s", 580 res->hr_remoteaddr); 581 nv_free(nvout); 582 goto close; 583 } 584 nv_free(nvout); 585 if (hast_proto_recv_hdr(out, &nvin) < 0) { 586 pjdlog_errno(LOG_WARNING, 587 "Unable to receive handshake header from %s", 588 res->hr_remoteaddr); 589 goto close; 590 } 591 errmsg = nv_get_string(nvin, "errmsg"); 592 if (errmsg != NULL) { 593 pjdlog_warning("%s", errmsg); 594 if (nv_exists(nvin, "wait")) 595 error = EBUSY; 596 nv_free(nvin); 597 goto close; 598 } 599 token = nv_get_uint8_array(nvin, &size, "token"); 600 if (token == NULL) { 601 pjdlog_warning("Handshake header from %s has no 'token' field.", 602 res->hr_remoteaddr); 603 nv_free(nvin); 604 goto close; 605 } 606 if (size != sizeof(res->hr_token)) { 607 pjdlog_warning("Handshake header from %s contains 'token' of wrong size (got %zu, expected %zu).", 608 res->hr_remoteaddr, size, sizeof(res->hr_token)); 609 nv_free(nvin); 610 goto close; 611 } 612 bcopy(token, res->hr_token, sizeof(res->hr_token)); 613 nv_free(nvin); 614 615 /* 616 * Second handshake step. 617 * Setup incoming connection with remote node. 618 */ 619 if (primary_connect(res, &in) == -1) 620 goto close; 621 622 nvout = nv_alloc(); 623 nv_add_string(nvout, res->hr_name, "resource"); 624 nv_add_uint8_array(nvout, res->hr_token, sizeof(res->hr_token), 625 "token"); 626 if (res->hr_resuid == 0) { 627 /* 628 * The resuid field was not yet initialized. 629 * Because we do synchronization inside init_resuid(), it is 630 * possible that someone already initialized it, the function 631 * will return false then, but if we successfully initialized 632 * it, we will get true. True means that there were no writes 633 * to this resource yet and we want to inform secondary that 634 * synchronization is not needed by sending "virgin" argument. 635 */ 636 if (init_resuid(res)) 637 nv_add_int8(nvout, 1, "virgin"); 638 } 639 nv_add_uint64(nvout, res->hr_resuid, "resuid"); 640 nv_add_uint64(nvout, res->hr_primary_localcnt, "localcnt"); 641 nv_add_uint64(nvout, res->hr_primary_remotecnt, "remotecnt"); 642 if (nv_error(nvout) != 0) { 643 pjdlog_common(LOG_WARNING, 0, nv_error(nvout), 644 "Unable to allocate header for connection with %s", 645 res->hr_remoteaddr); 646 nv_free(nvout); 647 goto close; 648 } 649 if (hast_proto_send(res, in, nvout, NULL, 0) < 0) { 650 pjdlog_errno(LOG_WARNING, 651 "Unable to send handshake header to %s", 652 res->hr_remoteaddr); 653 nv_free(nvout); 654 goto close; 655 } 656 nv_free(nvout); 657 if (hast_proto_recv_hdr(out, &nvin) < 0) { 658 pjdlog_errno(LOG_WARNING, 659 "Unable to receive handshake header from %s", 660 res->hr_remoteaddr); 661 goto close; 662 } 663 errmsg = nv_get_string(nvin, "errmsg"); 664 if (errmsg != NULL) { 665 pjdlog_warning("%s", errmsg); 666 nv_free(nvin); 667 goto close; 668 } 669 datasize = nv_get_int64(nvin, "datasize"); 670 if (datasize != res->hr_datasize) { 671 pjdlog_warning("Data size differs between nodes (local=%jd, remote=%jd).", 672 (intmax_t)res->hr_datasize, (intmax_t)datasize); 673 nv_free(nvin); 674 goto close; 675 } 676 extentsize = nv_get_int32(nvin, "extentsize"); 677 if (extentsize != res->hr_extentsize) { 678 pjdlog_warning("Extent size differs between nodes (local=%zd, remote=%zd).", 679 (ssize_t)res->hr_extentsize, (ssize_t)extentsize); 680 nv_free(nvin); 681 goto close; 682 } 683 res->hr_secondary_localcnt = nv_get_uint64(nvin, "localcnt"); 684 res->hr_secondary_remotecnt = nv_get_uint64(nvin, "remotecnt"); 685 res->hr_syncsrc = nv_get_uint8(nvin, "syncsrc"); 686 if (nv_exists(nvin, "virgin")) { 687 /* 688 * Secondary was reinitialized, bump localcnt if it is 0 as 689 * only we have the data. 690 */ 691 PJDLOG_ASSERT(res->hr_syncsrc == HAST_SYNCSRC_PRIMARY); 692 PJDLOG_ASSERT(res->hr_secondary_localcnt == 0); 693 694 if (res->hr_primary_localcnt == 0) { 695 PJDLOG_ASSERT(res->hr_secondary_remotecnt == 0); 696 697 mtx_lock(&metadata_lock); 698 res->hr_primary_localcnt++; 699 pjdlog_debug(1, "Increasing localcnt to %ju.", 700 (uintmax_t)res->hr_primary_localcnt); 701 (void)metadata_write(res); 702 mtx_unlock(&metadata_lock); 703 } 704 } 705 map = NULL; 706 mapsize = nv_get_uint32(nvin, "mapsize"); 707 if (mapsize > 0) { 708 map = malloc(mapsize); 709 if (map == NULL) { 710 pjdlog_error("Unable to allocate memory for remote activemap (mapsize=%ju).", 711 (uintmax_t)mapsize); 712 nv_free(nvin); 713 goto close; 714 } 715 /* 716 * Remote node have some dirty extents on its own, lets 717 * download its activemap. 718 */ 719 if (hast_proto_recv_data(res, out, nvin, map, 720 mapsize) < 0) { 721 pjdlog_errno(LOG_ERR, 722 "Unable to receive remote activemap"); 723 nv_free(nvin); 724 free(map); 725 goto close; 726 } 727 /* 728 * Merge local and remote bitmaps. 729 */ 730 activemap_merge(res->hr_amp, map, mapsize); 731 free(map); 732 /* 733 * Now that we merged bitmaps from both nodes, flush it to the 734 * disk before we start to synchronize. 735 */ 736 (void)hast_activemap_flush(res); 737 } 738 nv_free(nvin); 739 #ifdef notyet 740 /* Setup directions. */ 741 if (proto_send(out, NULL, 0) == -1) 742 pjdlog_errno(LOG_WARNING, "Unable to set connection direction"); 743 if (proto_recv(in, NULL, 0) == -1) 744 pjdlog_errno(LOG_WARNING, "Unable to set connection direction"); 745 #endif 746 pjdlog_info("Connected to %s.", res->hr_remoteaddr); 747 if (inp != NULL && outp != NULL) { 748 *inp = in; 749 *outp = out; 750 } else { 751 res->hr_remotein = in; 752 res->hr_remoteout = out; 753 } 754 event_send(res, EVENT_CONNECT); 755 return (0); 756 close: 757 if (errmsg != NULL && strcmp(errmsg, "Split-brain condition!") == 0) 758 event_send(res, EVENT_SPLITBRAIN); 759 proto_close(out); 760 if (in != NULL) 761 proto_close(in); 762 return (error); 763 } 764 765 static void 766 sync_start(void) 767 { 768 769 mtx_lock(&sync_lock); 770 sync_inprogress = true; 771 mtx_unlock(&sync_lock); 772 cv_signal(&sync_cond); 773 } 774 775 static void 776 sync_stop(void) 777 { 778 779 mtx_lock(&sync_lock); 780 if (sync_inprogress) 781 sync_inprogress = false; 782 mtx_unlock(&sync_lock); 783 } 784 785 static void 786 init_ggate(struct hast_resource *res) 787 { 788 struct g_gate_ctl_create ggiocreate; 789 struct g_gate_ctl_cancel ggiocancel; 790 791 /* 792 * We communicate with ggate via /dev/ggctl. Open it. 793 */ 794 res->hr_ggatefd = open("/dev/" G_GATE_CTL_NAME, O_RDWR); 795 if (res->hr_ggatefd < 0) 796 primary_exit(EX_OSFILE, "Unable to open /dev/" G_GATE_CTL_NAME); 797 /* 798 * Create provider before trying to connect, as connection failure 799 * is not critical, but may take some time. 800 */ 801 bzero(&ggiocreate, sizeof(ggiocreate)); 802 ggiocreate.gctl_version = G_GATE_VERSION; 803 ggiocreate.gctl_mediasize = res->hr_datasize; 804 ggiocreate.gctl_sectorsize = res->hr_local_sectorsize; 805 ggiocreate.gctl_flags = 0; 806 ggiocreate.gctl_maxcount = 0; 807 ggiocreate.gctl_timeout = 0; 808 ggiocreate.gctl_unit = G_GATE_NAME_GIVEN; 809 snprintf(ggiocreate.gctl_name, sizeof(ggiocreate.gctl_name), "hast/%s", 810 res->hr_provname); 811 if (ioctl(res->hr_ggatefd, G_GATE_CMD_CREATE, &ggiocreate) == 0) { 812 pjdlog_info("Device hast/%s created.", res->hr_provname); 813 res->hr_ggateunit = ggiocreate.gctl_unit; 814 return; 815 } 816 if (errno != EEXIST) { 817 primary_exit(EX_OSERR, "Unable to create hast/%s device", 818 res->hr_provname); 819 } 820 pjdlog_debug(1, 821 "Device hast/%s already exists, we will try to take it over.", 822 res->hr_provname); 823 /* 824 * If we received EEXIST, we assume that the process who created the 825 * provider died and didn't clean up. In that case we will start from 826 * where he left of. 827 */ 828 bzero(&ggiocancel, sizeof(ggiocancel)); 829 ggiocancel.gctl_version = G_GATE_VERSION; 830 ggiocancel.gctl_unit = G_GATE_NAME_GIVEN; 831 snprintf(ggiocancel.gctl_name, sizeof(ggiocancel.gctl_name), "hast/%s", 832 res->hr_provname); 833 if (ioctl(res->hr_ggatefd, G_GATE_CMD_CANCEL, &ggiocancel) == 0) { 834 pjdlog_info("Device hast/%s recovered.", res->hr_provname); 835 res->hr_ggateunit = ggiocancel.gctl_unit; 836 return; 837 } 838 primary_exit(EX_OSERR, "Unable to take over hast/%s device", 839 res->hr_provname); 840 } 841 842 void 843 hastd_primary(struct hast_resource *res) 844 { 845 pthread_t td; 846 pid_t pid; 847 int error, mode, debuglevel; 848 849 /* 850 * Create communication channel for sending control commands from 851 * parent to child. 852 */ 853 if (proto_client(NULL, "socketpair://", &res->hr_ctrl) < 0) { 854 /* TODO: There's no need for this to be fatal error. */ 855 KEEP_ERRNO((void)pidfile_remove(pfh)); 856 pjdlog_exit(EX_OSERR, 857 "Unable to create control sockets between parent and child"); 858 } 859 /* 860 * Create communication channel for sending events from child to parent. 861 */ 862 if (proto_client(NULL, "socketpair://", &res->hr_event) < 0) { 863 /* TODO: There's no need for this to be fatal error. */ 864 KEEP_ERRNO((void)pidfile_remove(pfh)); 865 pjdlog_exit(EX_OSERR, 866 "Unable to create event sockets between child and parent"); 867 } 868 /* 869 * Create communication channel for sending connection requests from 870 * child to parent. 871 */ 872 if (proto_client(NULL, "socketpair://", &res->hr_conn) < 0) { 873 /* TODO: There's no need for this to be fatal error. */ 874 KEEP_ERRNO((void)pidfile_remove(pfh)); 875 pjdlog_exit(EX_OSERR, 876 "Unable to create connection sockets between child and parent"); 877 } 878 879 pid = fork(); 880 if (pid < 0) { 881 /* TODO: There's no need for this to be fatal error. */ 882 KEEP_ERRNO((void)pidfile_remove(pfh)); 883 pjdlog_exit(EX_TEMPFAIL, "Unable to fork"); 884 } 885 886 if (pid > 0) { 887 /* This is parent. */ 888 /* Declare that we are receiver. */ 889 proto_recv(res->hr_event, NULL, 0); 890 proto_recv(res->hr_conn, NULL, 0); 891 /* Declare that we are sender. */ 892 proto_send(res->hr_ctrl, NULL, 0); 893 res->hr_workerpid = pid; 894 return; 895 } 896 897 gres = res; 898 mode = pjdlog_mode_get(); 899 debuglevel = pjdlog_debug_get(); 900 901 /* Declare that we are sender. */ 902 proto_send(res->hr_event, NULL, 0); 903 proto_send(res->hr_conn, NULL, 0); 904 /* Declare that we are receiver. */ 905 proto_recv(res->hr_ctrl, NULL, 0); 906 descriptors_cleanup(res); 907 908 descriptors_assert(res, mode); 909 910 pjdlog_init(mode); 911 pjdlog_debug_set(debuglevel); 912 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 913 setproctitle("%s (%s)", res->hr_name, role2str(res->hr_role)); 914 915 init_local(res); 916 init_ggate(res); 917 init_environment(res); 918 919 if (drop_privs(res) != 0) { 920 cleanup(res); 921 exit(EX_CONFIG); 922 } 923 pjdlog_info("Privileges successfully dropped."); 924 925 /* 926 * Create the guard thread first, so we can handle signals from the 927 * very begining. 928 */ 929 error = pthread_create(&td, NULL, guard_thread, res); 930 PJDLOG_ASSERT(error == 0); 931 /* 932 * Create the control thread before sending any event to the parent, 933 * as we can deadlock when parent sends control request to worker, 934 * but worker has no control thread started yet, so parent waits. 935 * In the meantime worker sends an event to the parent, but parent 936 * is unable to handle the event, because it waits for control 937 * request response. 938 */ 939 error = pthread_create(&td, NULL, ctrl_thread, res); 940 PJDLOG_ASSERT(error == 0); 941 if (real_remote(res)) { 942 error = init_remote(res, NULL, NULL); 943 if (error == 0) { 944 sync_start(); 945 } else if (error == EBUSY) { 946 time_t start = time(NULL); 947 948 pjdlog_warning("Waiting for remote node to become %s for %ds.", 949 role2str(HAST_ROLE_SECONDARY), 950 res->hr_timeout); 951 for (;;) { 952 sleep(1); 953 error = init_remote(res, NULL, NULL); 954 if (error != EBUSY) 955 break; 956 if (time(NULL) > start + res->hr_timeout) 957 break; 958 } 959 if (error == EBUSY) { 960 pjdlog_warning("Remote node is still %s, starting anyway.", 961 role2str(HAST_ROLE_PRIMARY)); 962 } 963 } 964 } 965 error = pthread_create(&td, NULL, ggate_recv_thread, res); 966 PJDLOG_ASSERT(error == 0); 967 error = pthread_create(&td, NULL, local_send_thread, res); 968 PJDLOG_ASSERT(error == 0); 969 error = pthread_create(&td, NULL, remote_send_thread, res); 970 PJDLOG_ASSERT(error == 0); 971 error = pthread_create(&td, NULL, remote_recv_thread, res); 972 PJDLOG_ASSERT(error == 0); 973 error = pthread_create(&td, NULL, ggate_send_thread, res); 974 PJDLOG_ASSERT(error == 0); 975 fullystarted = true; 976 (void)sync_thread(res); 977 } 978 979 static void 980 reqlog(int loglevel, int debuglevel, struct g_gate_ctl_io *ggio, const char *fmt, ...) 981 { 982 char msg[1024]; 983 va_list ap; 984 int len; 985 986 va_start(ap, fmt); 987 len = vsnprintf(msg, sizeof(msg), fmt, ap); 988 va_end(ap); 989 if ((size_t)len < sizeof(msg)) { 990 switch (ggio->gctl_cmd) { 991 case BIO_READ: 992 (void)snprintf(msg + len, sizeof(msg) - len, 993 "READ(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 994 (uintmax_t)ggio->gctl_length); 995 break; 996 case BIO_DELETE: 997 (void)snprintf(msg + len, sizeof(msg) - len, 998 "DELETE(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 999 (uintmax_t)ggio->gctl_length); 1000 break; 1001 case BIO_FLUSH: 1002 (void)snprintf(msg + len, sizeof(msg) - len, "FLUSH."); 1003 break; 1004 case BIO_WRITE: 1005 (void)snprintf(msg + len, sizeof(msg) - len, 1006 "WRITE(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 1007 (uintmax_t)ggio->gctl_length); 1008 break; 1009 default: 1010 (void)snprintf(msg + len, sizeof(msg) - len, 1011 "UNKNOWN(%u).", (unsigned int)ggio->gctl_cmd); 1012 break; 1013 } 1014 } 1015 pjdlog_common(loglevel, debuglevel, -1, "%s", msg); 1016 } 1017 1018 static void 1019 remote_close(struct hast_resource *res, int ncomp) 1020 { 1021 1022 rw_wlock(&hio_remote_lock[ncomp]); 1023 /* 1024 * A race is possible between dropping rlock and acquiring wlock - 1025 * another thread can close connection in-between. 1026 */ 1027 if (!ISCONNECTED(res, ncomp)) { 1028 PJDLOG_ASSERT(res->hr_remotein == NULL); 1029 PJDLOG_ASSERT(res->hr_remoteout == NULL); 1030 rw_unlock(&hio_remote_lock[ncomp]); 1031 return; 1032 } 1033 1034 PJDLOG_ASSERT(res->hr_remotein != NULL); 1035 PJDLOG_ASSERT(res->hr_remoteout != NULL); 1036 1037 pjdlog_debug(2, "Closing incoming connection to %s.", 1038 res->hr_remoteaddr); 1039 proto_close(res->hr_remotein); 1040 res->hr_remotein = NULL; 1041 pjdlog_debug(2, "Closing outgoing connection to %s.", 1042 res->hr_remoteaddr); 1043 proto_close(res->hr_remoteout); 1044 res->hr_remoteout = NULL; 1045 1046 rw_unlock(&hio_remote_lock[ncomp]); 1047 1048 pjdlog_warning("Disconnected from %s.", res->hr_remoteaddr); 1049 1050 /* 1051 * Stop synchronization if in-progress. 1052 */ 1053 sync_stop(); 1054 1055 event_send(res, EVENT_DISCONNECT); 1056 } 1057 1058 /* 1059 * Thread receives ggate I/O requests from the kernel and passes them to 1060 * appropriate threads: 1061 * WRITE - always goes to both local_send and remote_send threads 1062 * READ (when the block is up-to-date on local component) - 1063 * only local_send thread 1064 * READ (when the block isn't up-to-date on local component) - 1065 * only remote_send thread 1066 * DELETE - always goes to both local_send and remote_send threads 1067 * FLUSH - always goes to both local_send and remote_send threads 1068 */ 1069 static void * 1070 ggate_recv_thread(void *arg) 1071 { 1072 struct hast_resource *res = arg; 1073 struct g_gate_ctl_io *ggio; 1074 struct hio *hio; 1075 unsigned int ii, ncomp, ncomps; 1076 int error; 1077 1078 ncomps = HAST_NCOMPONENTS; 1079 1080 for (;;) { 1081 pjdlog_debug(2, "ggate_recv: Taking free request."); 1082 QUEUE_TAKE2(hio, free); 1083 pjdlog_debug(2, "ggate_recv: (%p) Got free request.", hio); 1084 ggio = &hio->hio_ggio; 1085 ggio->gctl_unit = res->hr_ggateunit; 1086 ggio->gctl_length = MAXPHYS; 1087 ggio->gctl_error = 0; 1088 pjdlog_debug(2, 1089 "ggate_recv: (%p) Waiting for request from the kernel.", 1090 hio); 1091 if (ioctl(res->hr_ggatefd, G_GATE_CMD_START, ggio) < 0) { 1092 if (sigexit_received) 1093 pthread_exit(NULL); 1094 primary_exit(EX_OSERR, "G_GATE_CMD_START failed"); 1095 } 1096 error = ggio->gctl_error; 1097 switch (error) { 1098 case 0: 1099 break; 1100 case ECANCELED: 1101 /* Exit gracefully. */ 1102 if (!sigexit_received) { 1103 pjdlog_debug(2, 1104 "ggate_recv: (%p) Received cancel from the kernel.", 1105 hio); 1106 pjdlog_info("Received cancel from the kernel, exiting."); 1107 } 1108 pthread_exit(NULL); 1109 case ENOMEM: 1110 /* 1111 * Buffer too small? Impossible, we allocate MAXPHYS 1112 * bytes - request can't be bigger than that. 1113 */ 1114 /* FALLTHROUGH */ 1115 case ENXIO: 1116 default: 1117 primary_exitx(EX_OSERR, "G_GATE_CMD_START failed: %s.", 1118 strerror(error)); 1119 } 1120 for (ii = 0; ii < ncomps; ii++) 1121 hio->hio_errors[ii] = EINVAL; 1122 reqlog(LOG_DEBUG, 2, ggio, 1123 "ggate_recv: (%p) Request received from the kernel: ", 1124 hio); 1125 /* 1126 * Inform all components about new write request. 1127 * For read request prefer local component unless the given 1128 * range is out-of-date, then use remote component. 1129 */ 1130 switch (ggio->gctl_cmd) { 1131 case BIO_READ: 1132 res->hr_stat_read++; 1133 pjdlog_debug(2, 1134 "ggate_recv: (%p) Moving request to the send queue.", 1135 hio); 1136 refcount_init(&hio->hio_countdown, 1); 1137 mtx_lock(&metadata_lock); 1138 if (res->hr_syncsrc == HAST_SYNCSRC_UNDEF || 1139 res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1140 /* 1141 * This range is up-to-date on local component, 1142 * so handle request locally. 1143 */ 1144 /* Local component is 0 for now. */ 1145 ncomp = 0; 1146 } else /* if (res->hr_syncsrc == 1147 HAST_SYNCSRC_SECONDARY) */ { 1148 PJDLOG_ASSERT(res->hr_syncsrc == 1149 HAST_SYNCSRC_SECONDARY); 1150 /* 1151 * This range is out-of-date on local component, 1152 * so send request to the remote node. 1153 */ 1154 /* Remote component is 1 for now. */ 1155 ncomp = 1; 1156 } 1157 mtx_unlock(&metadata_lock); 1158 QUEUE_INSERT1(hio, send, ncomp); 1159 break; 1160 case BIO_WRITE: 1161 res->hr_stat_write++; 1162 if (res->hr_resuid == 0) { 1163 /* 1164 * This is first write, initialize localcnt and 1165 * resuid. 1166 */ 1167 res->hr_primary_localcnt = 1; 1168 (void)init_resuid(res); 1169 } 1170 for (;;) { 1171 mtx_lock(&range_lock); 1172 if (rangelock_islocked(range_sync, 1173 ggio->gctl_offset, ggio->gctl_length)) { 1174 pjdlog_debug(2, 1175 "regular: Range offset=%jd length=%zu locked.", 1176 (intmax_t)ggio->gctl_offset, 1177 (size_t)ggio->gctl_length); 1178 range_regular_wait = true; 1179 cv_wait(&range_regular_cond, &range_lock); 1180 range_regular_wait = false; 1181 mtx_unlock(&range_lock); 1182 continue; 1183 } 1184 if (rangelock_add(range_regular, 1185 ggio->gctl_offset, ggio->gctl_length) < 0) { 1186 mtx_unlock(&range_lock); 1187 pjdlog_debug(2, 1188 "regular: Range offset=%jd length=%zu is already locked, waiting.", 1189 (intmax_t)ggio->gctl_offset, 1190 (size_t)ggio->gctl_length); 1191 sleep(1); 1192 continue; 1193 } 1194 mtx_unlock(&range_lock); 1195 break; 1196 } 1197 mtx_lock(&res->hr_amp_lock); 1198 if (activemap_write_start(res->hr_amp, 1199 ggio->gctl_offset, ggio->gctl_length)) { 1200 res->hr_stat_activemap_update++; 1201 (void)hast_activemap_flush(res); 1202 } 1203 mtx_unlock(&res->hr_amp_lock); 1204 /* FALLTHROUGH */ 1205 case BIO_DELETE: 1206 case BIO_FLUSH: 1207 switch (ggio->gctl_cmd) { 1208 case BIO_DELETE: 1209 res->hr_stat_delete++; 1210 break; 1211 case BIO_FLUSH: 1212 res->hr_stat_flush++; 1213 break; 1214 } 1215 pjdlog_debug(2, 1216 "ggate_recv: (%p) Moving request to the send queue.", 1217 hio); 1218 refcount_init(&hio->hio_countdown, ncomps); 1219 for (ii = 0; ii < ncomps; ii++) 1220 QUEUE_INSERT1(hio, send, ii); 1221 break; 1222 } 1223 } 1224 /* NOTREACHED */ 1225 return (NULL); 1226 } 1227 1228 /* 1229 * Thread reads from or writes to local component. 1230 * If local read fails, it redirects it to remote_send thread. 1231 */ 1232 static void * 1233 local_send_thread(void *arg) 1234 { 1235 struct hast_resource *res = arg; 1236 struct g_gate_ctl_io *ggio; 1237 struct hio *hio; 1238 unsigned int ncomp, rncomp; 1239 ssize_t ret; 1240 1241 /* Local component is 0 for now. */ 1242 ncomp = 0; 1243 /* Remote component is 1 for now. */ 1244 rncomp = 1; 1245 1246 for (;;) { 1247 pjdlog_debug(2, "local_send: Taking request."); 1248 QUEUE_TAKE1(hio, send, ncomp, 0); 1249 pjdlog_debug(2, "local_send: (%p) Got request.", hio); 1250 ggio = &hio->hio_ggio; 1251 switch (ggio->gctl_cmd) { 1252 case BIO_READ: 1253 ret = pread(res->hr_localfd, ggio->gctl_data, 1254 ggio->gctl_length, 1255 ggio->gctl_offset + res->hr_localoff); 1256 if (ret == ggio->gctl_length) 1257 hio->hio_errors[ncomp] = 0; 1258 else if (!ISSYNCREQ(hio)) { 1259 /* 1260 * If READ failed, try to read from remote node. 1261 */ 1262 if (ret < 0) { 1263 reqlog(LOG_WARNING, 0, ggio, 1264 "Local request failed (%s), trying remote node. ", 1265 strerror(errno)); 1266 } else if (ret != ggio->gctl_length) { 1267 reqlog(LOG_WARNING, 0, ggio, 1268 "Local request failed (%zd != %jd), trying remote node. ", 1269 ret, (intmax_t)ggio->gctl_length); 1270 } 1271 QUEUE_INSERT1(hio, send, rncomp); 1272 continue; 1273 } 1274 break; 1275 case BIO_WRITE: 1276 ret = pwrite(res->hr_localfd, ggio->gctl_data, 1277 ggio->gctl_length, 1278 ggio->gctl_offset + res->hr_localoff); 1279 if (ret < 0) { 1280 hio->hio_errors[ncomp] = errno; 1281 reqlog(LOG_WARNING, 0, ggio, 1282 "Local request failed (%s): ", 1283 strerror(errno)); 1284 } else if (ret != ggio->gctl_length) { 1285 hio->hio_errors[ncomp] = EIO; 1286 reqlog(LOG_WARNING, 0, ggio, 1287 "Local request failed (%zd != %jd): ", 1288 ret, (intmax_t)ggio->gctl_length); 1289 } else { 1290 hio->hio_errors[ncomp] = 0; 1291 } 1292 break; 1293 case BIO_DELETE: 1294 ret = g_delete(res->hr_localfd, 1295 ggio->gctl_offset + res->hr_localoff, 1296 ggio->gctl_length); 1297 if (ret < 0) { 1298 hio->hio_errors[ncomp] = errno; 1299 reqlog(LOG_WARNING, 0, ggio, 1300 "Local request failed (%s): ", 1301 strerror(errno)); 1302 } else { 1303 hio->hio_errors[ncomp] = 0; 1304 } 1305 break; 1306 case BIO_FLUSH: 1307 if (!res->hr_localflush) { 1308 ret = -1; 1309 errno = EOPNOTSUPP; 1310 break; 1311 } 1312 ret = g_flush(res->hr_localfd); 1313 if (ret < 0) { 1314 if (errno == EOPNOTSUPP) 1315 res->hr_localflush = false; 1316 hio->hio_errors[ncomp] = errno; 1317 reqlog(LOG_WARNING, 0, ggio, 1318 "Local request failed (%s): ", 1319 strerror(errno)); 1320 } else { 1321 hio->hio_errors[ncomp] = 0; 1322 } 1323 break; 1324 } 1325 if (refcount_release(&hio->hio_countdown)) { 1326 if (ISSYNCREQ(hio)) { 1327 mtx_lock(&sync_lock); 1328 SYNCREQDONE(hio); 1329 mtx_unlock(&sync_lock); 1330 cv_signal(&sync_cond); 1331 } else { 1332 pjdlog_debug(2, 1333 "local_send: (%p) Moving request to the done queue.", 1334 hio); 1335 QUEUE_INSERT2(hio, done); 1336 } 1337 } 1338 } 1339 /* NOTREACHED */ 1340 return (NULL); 1341 } 1342 1343 static void 1344 keepalive_send(struct hast_resource *res, unsigned int ncomp) 1345 { 1346 struct nv *nv; 1347 1348 rw_rlock(&hio_remote_lock[ncomp]); 1349 1350 if (!ISCONNECTED(res, ncomp)) { 1351 rw_unlock(&hio_remote_lock[ncomp]); 1352 return; 1353 } 1354 1355 PJDLOG_ASSERT(res->hr_remotein != NULL); 1356 PJDLOG_ASSERT(res->hr_remoteout != NULL); 1357 1358 nv = nv_alloc(); 1359 nv_add_uint8(nv, HIO_KEEPALIVE, "cmd"); 1360 if (nv_error(nv) != 0) { 1361 rw_unlock(&hio_remote_lock[ncomp]); 1362 nv_free(nv); 1363 pjdlog_debug(1, 1364 "keepalive_send: Unable to prepare header to send."); 1365 return; 1366 } 1367 if (hast_proto_send(res, res->hr_remoteout, nv, NULL, 0) < 0) { 1368 rw_unlock(&hio_remote_lock[ncomp]); 1369 pjdlog_common(LOG_DEBUG, 1, errno, 1370 "keepalive_send: Unable to send request"); 1371 nv_free(nv); 1372 remote_close(res, ncomp); 1373 return; 1374 } 1375 1376 rw_unlock(&hio_remote_lock[ncomp]); 1377 nv_free(nv); 1378 pjdlog_debug(2, "keepalive_send: Request sent."); 1379 } 1380 1381 /* 1382 * Thread sends request to secondary node. 1383 */ 1384 static void * 1385 remote_send_thread(void *arg) 1386 { 1387 struct hast_resource *res = arg; 1388 struct g_gate_ctl_io *ggio; 1389 time_t lastcheck, now; 1390 struct hio *hio; 1391 struct nv *nv; 1392 unsigned int ncomp; 1393 bool wakeup; 1394 uint64_t offset, length; 1395 uint8_t cmd; 1396 void *data; 1397 1398 /* Remote component is 1 for now. */ 1399 ncomp = 1; 1400 lastcheck = time(NULL); 1401 1402 for (;;) { 1403 pjdlog_debug(2, "remote_send: Taking request."); 1404 QUEUE_TAKE1(hio, send, ncomp, HAST_KEEPALIVE); 1405 if (hio == NULL) { 1406 now = time(NULL); 1407 if (lastcheck + HAST_KEEPALIVE <= now) { 1408 keepalive_send(res, ncomp); 1409 lastcheck = now; 1410 } 1411 continue; 1412 } 1413 pjdlog_debug(2, "remote_send: (%p) Got request.", hio); 1414 ggio = &hio->hio_ggio; 1415 switch (ggio->gctl_cmd) { 1416 case BIO_READ: 1417 cmd = HIO_READ; 1418 data = NULL; 1419 offset = ggio->gctl_offset; 1420 length = ggio->gctl_length; 1421 break; 1422 case BIO_WRITE: 1423 cmd = HIO_WRITE; 1424 data = ggio->gctl_data; 1425 offset = ggio->gctl_offset; 1426 length = ggio->gctl_length; 1427 break; 1428 case BIO_DELETE: 1429 cmd = HIO_DELETE; 1430 data = NULL; 1431 offset = ggio->gctl_offset; 1432 length = ggio->gctl_length; 1433 break; 1434 case BIO_FLUSH: 1435 cmd = HIO_FLUSH; 1436 data = NULL; 1437 offset = 0; 1438 length = 0; 1439 break; 1440 default: 1441 PJDLOG_ABORT("invalid condition"); 1442 } 1443 nv = nv_alloc(); 1444 nv_add_uint8(nv, cmd, "cmd"); 1445 nv_add_uint64(nv, (uint64_t)ggio->gctl_seq, "seq"); 1446 nv_add_uint64(nv, offset, "offset"); 1447 nv_add_uint64(nv, length, "length"); 1448 if (nv_error(nv) != 0) { 1449 hio->hio_errors[ncomp] = nv_error(nv); 1450 pjdlog_debug(2, 1451 "remote_send: (%p) Unable to prepare header to send.", 1452 hio); 1453 reqlog(LOG_ERR, 0, ggio, 1454 "Unable to prepare header to send (%s): ", 1455 strerror(nv_error(nv))); 1456 /* Move failed request immediately to the done queue. */ 1457 goto done_queue; 1458 } 1459 pjdlog_debug(2, 1460 "remote_send: (%p) Moving request to the recv queue.", 1461 hio); 1462 /* 1463 * Protect connection from disappearing. 1464 */ 1465 rw_rlock(&hio_remote_lock[ncomp]); 1466 if (!ISCONNECTED(res, ncomp)) { 1467 rw_unlock(&hio_remote_lock[ncomp]); 1468 hio->hio_errors[ncomp] = ENOTCONN; 1469 goto done_queue; 1470 } 1471 /* 1472 * Move the request to recv queue before sending it, because 1473 * in different order we can get reply before we move request 1474 * to recv queue. 1475 */ 1476 mtx_lock(&hio_recv_list_lock[ncomp]); 1477 wakeup = TAILQ_EMPTY(&hio_recv_list[ncomp]); 1478 TAILQ_INSERT_TAIL(&hio_recv_list[ncomp], hio, hio_next[ncomp]); 1479 mtx_unlock(&hio_recv_list_lock[ncomp]); 1480 if (hast_proto_send(res, res->hr_remoteout, nv, data, 1481 data != NULL ? length : 0) < 0) { 1482 hio->hio_errors[ncomp] = errno; 1483 rw_unlock(&hio_remote_lock[ncomp]); 1484 pjdlog_debug(2, 1485 "remote_send: (%p) Unable to send request.", hio); 1486 reqlog(LOG_ERR, 0, ggio, 1487 "Unable to send request (%s): ", 1488 strerror(hio->hio_errors[ncomp])); 1489 remote_close(res, ncomp); 1490 /* 1491 * Take request back from the receive queue and move 1492 * it immediately to the done queue. 1493 */ 1494 mtx_lock(&hio_recv_list_lock[ncomp]); 1495 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, hio_next[ncomp]); 1496 mtx_unlock(&hio_recv_list_lock[ncomp]); 1497 goto done_queue; 1498 } 1499 rw_unlock(&hio_remote_lock[ncomp]); 1500 nv_free(nv); 1501 if (wakeup) 1502 cv_signal(&hio_recv_list_cond[ncomp]); 1503 continue; 1504 done_queue: 1505 nv_free(nv); 1506 if (ISSYNCREQ(hio)) { 1507 if (!refcount_release(&hio->hio_countdown)) 1508 continue; 1509 mtx_lock(&sync_lock); 1510 SYNCREQDONE(hio); 1511 mtx_unlock(&sync_lock); 1512 cv_signal(&sync_cond); 1513 continue; 1514 } 1515 if (ggio->gctl_cmd == BIO_WRITE) { 1516 mtx_lock(&res->hr_amp_lock); 1517 if (activemap_need_sync(res->hr_amp, ggio->gctl_offset, 1518 ggio->gctl_length)) { 1519 (void)hast_activemap_flush(res); 1520 } 1521 mtx_unlock(&res->hr_amp_lock); 1522 } 1523 if (!refcount_release(&hio->hio_countdown)) 1524 continue; 1525 pjdlog_debug(2, 1526 "remote_send: (%p) Moving request to the done queue.", 1527 hio); 1528 QUEUE_INSERT2(hio, done); 1529 } 1530 /* NOTREACHED */ 1531 return (NULL); 1532 } 1533 1534 /* 1535 * Thread receives answer from secondary node and passes it to ggate_send 1536 * thread. 1537 */ 1538 static void * 1539 remote_recv_thread(void *arg) 1540 { 1541 struct hast_resource *res = arg; 1542 struct g_gate_ctl_io *ggio; 1543 struct hio *hio; 1544 struct nv *nv; 1545 unsigned int ncomp; 1546 uint64_t seq; 1547 int error; 1548 1549 /* Remote component is 1 for now. */ 1550 ncomp = 1; 1551 1552 for (;;) { 1553 /* Wait until there is anything to receive. */ 1554 mtx_lock(&hio_recv_list_lock[ncomp]); 1555 while (TAILQ_EMPTY(&hio_recv_list[ncomp])) { 1556 pjdlog_debug(2, "remote_recv: No requests, waiting."); 1557 cv_wait(&hio_recv_list_cond[ncomp], 1558 &hio_recv_list_lock[ncomp]); 1559 } 1560 mtx_unlock(&hio_recv_list_lock[ncomp]); 1561 rw_rlock(&hio_remote_lock[ncomp]); 1562 if (!ISCONNECTED(res, ncomp)) { 1563 rw_unlock(&hio_remote_lock[ncomp]); 1564 /* 1565 * Connection is dead, so move all pending requests to 1566 * the done queue (one-by-one). 1567 */ 1568 mtx_lock(&hio_recv_list_lock[ncomp]); 1569 hio = TAILQ_FIRST(&hio_recv_list[ncomp]); 1570 PJDLOG_ASSERT(hio != NULL); 1571 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1572 hio_next[ncomp]); 1573 mtx_unlock(&hio_recv_list_lock[ncomp]); 1574 goto done_queue; 1575 } 1576 if (hast_proto_recv_hdr(res->hr_remotein, &nv) < 0) { 1577 pjdlog_errno(LOG_ERR, 1578 "Unable to receive reply header"); 1579 rw_unlock(&hio_remote_lock[ncomp]); 1580 remote_close(res, ncomp); 1581 continue; 1582 } 1583 rw_unlock(&hio_remote_lock[ncomp]); 1584 seq = nv_get_uint64(nv, "seq"); 1585 if (seq == 0) { 1586 pjdlog_error("Header contains no 'seq' field."); 1587 nv_free(nv); 1588 continue; 1589 } 1590 mtx_lock(&hio_recv_list_lock[ncomp]); 1591 TAILQ_FOREACH(hio, &hio_recv_list[ncomp], hio_next[ncomp]) { 1592 if (hio->hio_ggio.gctl_seq == seq) { 1593 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1594 hio_next[ncomp]); 1595 break; 1596 } 1597 } 1598 mtx_unlock(&hio_recv_list_lock[ncomp]); 1599 if (hio == NULL) { 1600 pjdlog_error("Found no request matching received 'seq' field (%ju).", 1601 (uintmax_t)seq); 1602 nv_free(nv); 1603 continue; 1604 } 1605 error = nv_get_int16(nv, "error"); 1606 if (error != 0) { 1607 /* Request failed on remote side. */ 1608 hio->hio_errors[ncomp] = error; 1609 reqlog(LOG_WARNING, 0, &hio->hio_ggio, 1610 "Remote request failed (%s): ", strerror(error)); 1611 nv_free(nv); 1612 goto done_queue; 1613 } 1614 ggio = &hio->hio_ggio; 1615 switch (ggio->gctl_cmd) { 1616 case BIO_READ: 1617 rw_rlock(&hio_remote_lock[ncomp]); 1618 if (!ISCONNECTED(res, ncomp)) { 1619 rw_unlock(&hio_remote_lock[ncomp]); 1620 nv_free(nv); 1621 goto done_queue; 1622 } 1623 if (hast_proto_recv_data(res, res->hr_remotein, nv, 1624 ggio->gctl_data, ggio->gctl_length) < 0) { 1625 hio->hio_errors[ncomp] = errno; 1626 pjdlog_errno(LOG_ERR, 1627 "Unable to receive reply data"); 1628 rw_unlock(&hio_remote_lock[ncomp]); 1629 nv_free(nv); 1630 remote_close(res, ncomp); 1631 goto done_queue; 1632 } 1633 rw_unlock(&hio_remote_lock[ncomp]); 1634 break; 1635 case BIO_WRITE: 1636 case BIO_DELETE: 1637 case BIO_FLUSH: 1638 break; 1639 default: 1640 PJDLOG_ABORT("invalid condition"); 1641 } 1642 hio->hio_errors[ncomp] = 0; 1643 nv_free(nv); 1644 done_queue: 1645 if (refcount_release(&hio->hio_countdown)) { 1646 if (ISSYNCREQ(hio)) { 1647 mtx_lock(&sync_lock); 1648 SYNCREQDONE(hio); 1649 mtx_unlock(&sync_lock); 1650 cv_signal(&sync_cond); 1651 } else { 1652 pjdlog_debug(2, 1653 "remote_recv: (%p) Moving request to the done queue.", 1654 hio); 1655 QUEUE_INSERT2(hio, done); 1656 } 1657 } 1658 } 1659 /* NOTREACHED */ 1660 return (NULL); 1661 } 1662 1663 /* 1664 * Thread sends answer to the kernel. 1665 */ 1666 static void * 1667 ggate_send_thread(void *arg) 1668 { 1669 struct hast_resource *res = arg; 1670 struct g_gate_ctl_io *ggio; 1671 struct hio *hio; 1672 unsigned int ii, ncomp, ncomps; 1673 1674 ncomps = HAST_NCOMPONENTS; 1675 1676 for (;;) { 1677 pjdlog_debug(2, "ggate_send: Taking request."); 1678 QUEUE_TAKE2(hio, done); 1679 pjdlog_debug(2, "ggate_send: (%p) Got request.", hio); 1680 ggio = &hio->hio_ggio; 1681 for (ii = 0; ii < ncomps; ii++) { 1682 if (hio->hio_errors[ii] == 0) { 1683 /* 1684 * One successful request is enough to declare 1685 * success. 1686 */ 1687 ggio->gctl_error = 0; 1688 break; 1689 } 1690 } 1691 if (ii == ncomps) { 1692 /* 1693 * None of the requests were successful. 1694 * Use the error from local component except the 1695 * case when we did only remote request. 1696 */ 1697 if (ggio->gctl_cmd == BIO_READ && 1698 res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) 1699 ggio->gctl_error = hio->hio_errors[1]; 1700 else 1701 ggio->gctl_error = hio->hio_errors[0]; 1702 } 1703 if (ggio->gctl_error == 0 && ggio->gctl_cmd == BIO_WRITE) { 1704 mtx_lock(&res->hr_amp_lock); 1705 if (activemap_write_complete(res->hr_amp, 1706 ggio->gctl_offset, ggio->gctl_length)) { 1707 res->hr_stat_activemap_update++; 1708 (void)hast_activemap_flush(res); 1709 } 1710 mtx_unlock(&res->hr_amp_lock); 1711 } 1712 if (ggio->gctl_cmd == BIO_WRITE) { 1713 /* 1714 * Unlock range we locked. 1715 */ 1716 mtx_lock(&range_lock); 1717 rangelock_del(range_regular, ggio->gctl_offset, 1718 ggio->gctl_length); 1719 if (range_sync_wait) 1720 cv_signal(&range_sync_cond); 1721 mtx_unlock(&range_lock); 1722 /* 1723 * Bump local count if this is first write after 1724 * connection failure with remote node. 1725 */ 1726 ncomp = 1; 1727 rw_rlock(&hio_remote_lock[ncomp]); 1728 if (!ISCONNECTED(res, ncomp)) { 1729 mtx_lock(&metadata_lock); 1730 if (res->hr_primary_localcnt == 1731 res->hr_secondary_remotecnt) { 1732 res->hr_primary_localcnt++; 1733 pjdlog_debug(1, 1734 "Increasing localcnt to %ju.", 1735 (uintmax_t)res->hr_primary_localcnt); 1736 (void)metadata_write(res); 1737 } 1738 mtx_unlock(&metadata_lock); 1739 } 1740 rw_unlock(&hio_remote_lock[ncomp]); 1741 } 1742 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DONE, ggio) < 0) 1743 primary_exit(EX_OSERR, "G_GATE_CMD_DONE failed"); 1744 pjdlog_debug(2, 1745 "ggate_send: (%p) Moving request to the free queue.", hio); 1746 QUEUE_INSERT2(hio, free); 1747 } 1748 /* NOTREACHED */ 1749 return (NULL); 1750 } 1751 1752 /* 1753 * Thread synchronize local and remote components. 1754 */ 1755 static void * 1756 sync_thread(void *arg __unused) 1757 { 1758 struct hast_resource *res = arg; 1759 struct hio *hio; 1760 struct g_gate_ctl_io *ggio; 1761 struct timeval tstart, tend, tdiff; 1762 unsigned int ii, ncomp, ncomps; 1763 off_t offset, length, synced; 1764 bool dorewind; 1765 int syncext; 1766 1767 ncomps = HAST_NCOMPONENTS; 1768 dorewind = true; 1769 synced = 0; 1770 offset = -1; 1771 1772 for (;;) { 1773 mtx_lock(&sync_lock); 1774 if (offset >= 0 && !sync_inprogress) { 1775 gettimeofday(&tend, NULL); 1776 timersub(&tend, &tstart, &tdiff); 1777 pjdlog_info("Synchronization interrupted after %#.0T. " 1778 "%NB synchronized so far.", &tdiff, 1779 (intmax_t)synced); 1780 event_send(res, EVENT_SYNCINTR); 1781 } 1782 while (!sync_inprogress) { 1783 dorewind = true; 1784 synced = 0; 1785 cv_wait(&sync_cond, &sync_lock); 1786 } 1787 mtx_unlock(&sync_lock); 1788 /* 1789 * Obtain offset at which we should synchronize. 1790 * Rewind synchronization if needed. 1791 */ 1792 mtx_lock(&res->hr_amp_lock); 1793 if (dorewind) 1794 activemap_sync_rewind(res->hr_amp); 1795 offset = activemap_sync_offset(res->hr_amp, &length, &syncext); 1796 if (syncext != -1) { 1797 /* 1798 * We synchronized entire syncext extent, we can mark 1799 * it as clean now. 1800 */ 1801 if (activemap_extent_complete(res->hr_amp, syncext)) 1802 (void)hast_activemap_flush(res); 1803 } 1804 mtx_unlock(&res->hr_amp_lock); 1805 if (dorewind) { 1806 dorewind = false; 1807 if (offset < 0) 1808 pjdlog_info("Nodes are in sync."); 1809 else { 1810 pjdlog_info("Synchronization started. %NB to go.", 1811 (intmax_t)(res->hr_extentsize * 1812 activemap_ndirty(res->hr_amp))); 1813 event_send(res, EVENT_SYNCSTART); 1814 gettimeofday(&tstart, NULL); 1815 } 1816 } 1817 if (offset < 0) { 1818 sync_stop(); 1819 pjdlog_debug(1, "Nothing to synchronize."); 1820 /* 1821 * Synchronization complete, make both localcnt and 1822 * remotecnt equal. 1823 */ 1824 ncomp = 1; 1825 rw_rlock(&hio_remote_lock[ncomp]); 1826 if (ISCONNECTED(res, ncomp)) { 1827 if (synced > 0) { 1828 int64_t bps; 1829 1830 gettimeofday(&tend, NULL); 1831 timersub(&tend, &tstart, &tdiff); 1832 bps = (int64_t)((double)synced / 1833 ((double)tdiff.tv_sec + 1834 (double)tdiff.tv_usec / 1000000)); 1835 pjdlog_info("Synchronization complete. " 1836 "%NB synchronized in %#.0lT (%NB/sec).", 1837 (intmax_t)synced, &tdiff, 1838 (intmax_t)bps); 1839 event_send(res, EVENT_SYNCDONE); 1840 } 1841 mtx_lock(&metadata_lock); 1842 res->hr_syncsrc = HAST_SYNCSRC_UNDEF; 1843 res->hr_primary_localcnt = 1844 res->hr_secondary_remotecnt; 1845 res->hr_primary_remotecnt = 1846 res->hr_secondary_localcnt; 1847 pjdlog_debug(1, 1848 "Setting localcnt to %ju and remotecnt to %ju.", 1849 (uintmax_t)res->hr_primary_localcnt, 1850 (uintmax_t)res->hr_primary_remotecnt); 1851 (void)metadata_write(res); 1852 mtx_unlock(&metadata_lock); 1853 } 1854 rw_unlock(&hio_remote_lock[ncomp]); 1855 continue; 1856 } 1857 pjdlog_debug(2, "sync: Taking free request."); 1858 QUEUE_TAKE2(hio, free); 1859 pjdlog_debug(2, "sync: (%p) Got free request.", hio); 1860 /* 1861 * Lock the range we are going to synchronize. We don't want 1862 * race where someone writes between our read and write. 1863 */ 1864 for (;;) { 1865 mtx_lock(&range_lock); 1866 if (rangelock_islocked(range_regular, offset, length)) { 1867 pjdlog_debug(2, 1868 "sync: Range offset=%jd length=%jd locked.", 1869 (intmax_t)offset, (intmax_t)length); 1870 range_sync_wait = true; 1871 cv_wait(&range_sync_cond, &range_lock); 1872 range_sync_wait = false; 1873 mtx_unlock(&range_lock); 1874 continue; 1875 } 1876 if (rangelock_add(range_sync, offset, length) < 0) { 1877 mtx_unlock(&range_lock); 1878 pjdlog_debug(2, 1879 "sync: Range offset=%jd length=%jd is already locked, waiting.", 1880 (intmax_t)offset, (intmax_t)length); 1881 sleep(1); 1882 continue; 1883 } 1884 mtx_unlock(&range_lock); 1885 break; 1886 } 1887 /* 1888 * First read the data from synchronization source. 1889 */ 1890 SYNCREQ(hio); 1891 ggio = &hio->hio_ggio; 1892 ggio->gctl_cmd = BIO_READ; 1893 ggio->gctl_offset = offset; 1894 ggio->gctl_length = length; 1895 ggio->gctl_error = 0; 1896 for (ii = 0; ii < ncomps; ii++) 1897 hio->hio_errors[ii] = EINVAL; 1898 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 1899 hio); 1900 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 1901 hio); 1902 mtx_lock(&metadata_lock); 1903 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1904 /* 1905 * This range is up-to-date on local component, 1906 * so handle request locally. 1907 */ 1908 /* Local component is 0 for now. */ 1909 ncomp = 0; 1910 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 1911 PJDLOG_ASSERT(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 1912 /* 1913 * This range is out-of-date on local component, 1914 * so send request to the remote node. 1915 */ 1916 /* Remote component is 1 for now. */ 1917 ncomp = 1; 1918 } 1919 mtx_unlock(&metadata_lock); 1920 refcount_init(&hio->hio_countdown, 1); 1921 QUEUE_INSERT1(hio, send, ncomp); 1922 1923 /* 1924 * Let's wait for READ to finish. 1925 */ 1926 mtx_lock(&sync_lock); 1927 while (!ISSYNCREQDONE(hio)) 1928 cv_wait(&sync_cond, &sync_lock); 1929 mtx_unlock(&sync_lock); 1930 1931 if (hio->hio_errors[ncomp] != 0) { 1932 pjdlog_error("Unable to read synchronization data: %s.", 1933 strerror(hio->hio_errors[ncomp])); 1934 goto free_queue; 1935 } 1936 1937 /* 1938 * We read the data from synchronization source, now write it 1939 * to synchronization target. 1940 */ 1941 SYNCREQ(hio); 1942 ggio->gctl_cmd = BIO_WRITE; 1943 for (ii = 0; ii < ncomps; ii++) 1944 hio->hio_errors[ii] = EINVAL; 1945 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 1946 hio); 1947 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 1948 hio); 1949 mtx_lock(&metadata_lock); 1950 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1951 /* 1952 * This range is up-to-date on local component, 1953 * so we update remote component. 1954 */ 1955 /* Remote component is 1 for now. */ 1956 ncomp = 1; 1957 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 1958 PJDLOG_ASSERT(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 1959 /* 1960 * This range is out-of-date on local component, 1961 * so we update it. 1962 */ 1963 /* Local component is 0 for now. */ 1964 ncomp = 0; 1965 } 1966 mtx_unlock(&metadata_lock); 1967 1968 pjdlog_debug(2, "sync: (%p) Moving request to the send queues.", 1969 hio); 1970 refcount_init(&hio->hio_countdown, 1); 1971 QUEUE_INSERT1(hio, send, ncomp); 1972 1973 /* 1974 * Let's wait for WRITE to finish. 1975 */ 1976 mtx_lock(&sync_lock); 1977 while (!ISSYNCREQDONE(hio)) 1978 cv_wait(&sync_cond, &sync_lock); 1979 mtx_unlock(&sync_lock); 1980 1981 if (hio->hio_errors[ncomp] != 0) { 1982 pjdlog_error("Unable to write synchronization data: %s.", 1983 strerror(hio->hio_errors[ncomp])); 1984 goto free_queue; 1985 } 1986 1987 synced += length; 1988 free_queue: 1989 mtx_lock(&range_lock); 1990 rangelock_del(range_sync, offset, length); 1991 if (range_regular_wait) 1992 cv_signal(&range_regular_cond); 1993 mtx_unlock(&range_lock); 1994 pjdlog_debug(2, "sync: (%p) Moving request to the free queue.", 1995 hio); 1996 QUEUE_INSERT2(hio, free); 1997 } 1998 /* NOTREACHED */ 1999 return (NULL); 2000 } 2001 2002 void 2003 primary_config_reload(struct hast_resource *res, struct nv *nv) 2004 { 2005 unsigned int ii, ncomps; 2006 int modified, vint; 2007 const char *vstr; 2008 2009 pjdlog_info("Reloading configuration..."); 2010 2011 PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY); 2012 PJDLOG_ASSERT(gres == res); 2013 nv_assert(nv, "remoteaddr"); 2014 nv_assert(nv, "sourceaddr"); 2015 nv_assert(nv, "replication"); 2016 nv_assert(nv, "checksum"); 2017 nv_assert(nv, "compression"); 2018 nv_assert(nv, "timeout"); 2019 nv_assert(nv, "exec"); 2020 nv_assert(nv, "metaflush"); 2021 2022 ncomps = HAST_NCOMPONENTS; 2023 2024 #define MODIFIED_REMOTEADDR 0x01 2025 #define MODIFIED_SOURCEADDR 0x02 2026 #define MODIFIED_REPLICATION 0x04 2027 #define MODIFIED_CHECKSUM 0x08 2028 #define MODIFIED_COMPRESSION 0x10 2029 #define MODIFIED_TIMEOUT 0x20 2030 #define MODIFIED_EXEC 0x40 2031 #define MODIFIED_METAFLUSH 0x80 2032 modified = 0; 2033 2034 vstr = nv_get_string(nv, "remoteaddr"); 2035 if (strcmp(gres->hr_remoteaddr, vstr) != 0) { 2036 /* 2037 * Don't copy res->hr_remoteaddr to gres just yet. 2038 * We want remote_close() to log disconnect from the old 2039 * addresses, not from the new ones. 2040 */ 2041 modified |= MODIFIED_REMOTEADDR; 2042 } 2043 vstr = nv_get_string(nv, "sourceaddr"); 2044 if (strcmp(gres->hr_sourceaddr, vstr) != 0) { 2045 strlcpy(gres->hr_sourceaddr, vstr, sizeof(gres->hr_sourceaddr)); 2046 modified |= MODIFIED_SOURCEADDR; 2047 } 2048 vint = nv_get_int32(nv, "replication"); 2049 if (gres->hr_replication != vint) { 2050 gres->hr_replication = vint; 2051 modified |= MODIFIED_REPLICATION; 2052 } 2053 vint = nv_get_int32(nv, "checksum"); 2054 if (gres->hr_checksum != vint) { 2055 gres->hr_checksum = vint; 2056 modified |= MODIFIED_CHECKSUM; 2057 } 2058 vint = nv_get_int32(nv, "compression"); 2059 if (gres->hr_compression != vint) { 2060 gres->hr_compression = vint; 2061 modified |= MODIFIED_COMPRESSION; 2062 } 2063 vint = nv_get_int32(nv, "timeout"); 2064 if (gres->hr_timeout != vint) { 2065 gres->hr_timeout = vint; 2066 modified |= MODIFIED_TIMEOUT; 2067 } 2068 vstr = nv_get_string(nv, "exec"); 2069 if (strcmp(gres->hr_exec, vstr) != 0) { 2070 strlcpy(gres->hr_exec, vstr, sizeof(gres->hr_exec)); 2071 modified |= MODIFIED_EXEC; 2072 } 2073 vint = nv_get_int32(nv, "metaflush"); 2074 if (gres->hr_metaflush != vint) { 2075 gres->hr_metaflush = vint; 2076 modified |= MODIFIED_METAFLUSH; 2077 } 2078 2079 /* 2080 * Change timeout for connected sockets. 2081 * Don't bother if we need to reconnect. 2082 */ 2083 if ((modified & MODIFIED_TIMEOUT) != 0 && 2084 (modified & (MODIFIED_REMOTEADDR | MODIFIED_SOURCEADDR | 2085 MODIFIED_REPLICATION)) == 0) { 2086 for (ii = 0; ii < ncomps; ii++) { 2087 if (!ISREMOTE(ii)) 2088 continue; 2089 rw_rlock(&hio_remote_lock[ii]); 2090 if (!ISCONNECTED(gres, ii)) { 2091 rw_unlock(&hio_remote_lock[ii]); 2092 continue; 2093 } 2094 rw_unlock(&hio_remote_lock[ii]); 2095 if (proto_timeout(gres->hr_remotein, 2096 gres->hr_timeout) < 0) { 2097 pjdlog_errno(LOG_WARNING, 2098 "Unable to set connection timeout"); 2099 } 2100 if (proto_timeout(gres->hr_remoteout, 2101 gres->hr_timeout) < 0) { 2102 pjdlog_errno(LOG_WARNING, 2103 "Unable to set connection timeout"); 2104 } 2105 } 2106 } 2107 if ((modified & (MODIFIED_REMOTEADDR | MODIFIED_SOURCEADDR | 2108 MODIFIED_REPLICATION)) != 0) { 2109 for (ii = 0; ii < ncomps; ii++) { 2110 if (!ISREMOTE(ii)) 2111 continue; 2112 remote_close(gres, ii); 2113 } 2114 if (modified & MODIFIED_REMOTEADDR) { 2115 vstr = nv_get_string(nv, "remoteaddr"); 2116 strlcpy(gres->hr_remoteaddr, vstr, 2117 sizeof(gres->hr_remoteaddr)); 2118 } 2119 } 2120 #undef MODIFIED_REMOTEADDR 2121 #undef MODIFIED_SOURCEADDR 2122 #undef MODIFIED_REPLICATION 2123 #undef MODIFIED_CHECKSUM 2124 #undef MODIFIED_COMPRESSION 2125 #undef MODIFIED_TIMEOUT 2126 #undef MODIFIED_EXEC 2127 #undef MODIFIED_METAFLUSH 2128 2129 pjdlog_info("Configuration reloaded successfully."); 2130 } 2131 2132 static void 2133 guard_one(struct hast_resource *res, unsigned int ncomp) 2134 { 2135 struct proto_conn *in, *out; 2136 2137 if (!ISREMOTE(ncomp)) 2138 return; 2139 2140 rw_rlock(&hio_remote_lock[ncomp]); 2141 2142 if (!real_remote(res)) { 2143 rw_unlock(&hio_remote_lock[ncomp]); 2144 return; 2145 } 2146 2147 if (ISCONNECTED(res, ncomp)) { 2148 PJDLOG_ASSERT(res->hr_remotein != NULL); 2149 PJDLOG_ASSERT(res->hr_remoteout != NULL); 2150 rw_unlock(&hio_remote_lock[ncomp]); 2151 pjdlog_debug(2, "remote_guard: Connection to %s is ok.", 2152 res->hr_remoteaddr); 2153 return; 2154 } 2155 2156 PJDLOG_ASSERT(res->hr_remotein == NULL); 2157 PJDLOG_ASSERT(res->hr_remoteout == NULL); 2158 /* 2159 * Upgrade the lock. It doesn't have to be atomic as no other thread 2160 * can change connection status from disconnected to connected. 2161 */ 2162 rw_unlock(&hio_remote_lock[ncomp]); 2163 pjdlog_debug(2, "remote_guard: Reconnecting to %s.", 2164 res->hr_remoteaddr); 2165 in = out = NULL; 2166 if (init_remote(res, &in, &out) == 0) { 2167 rw_wlock(&hio_remote_lock[ncomp]); 2168 PJDLOG_ASSERT(res->hr_remotein == NULL); 2169 PJDLOG_ASSERT(res->hr_remoteout == NULL); 2170 PJDLOG_ASSERT(in != NULL && out != NULL); 2171 res->hr_remotein = in; 2172 res->hr_remoteout = out; 2173 rw_unlock(&hio_remote_lock[ncomp]); 2174 pjdlog_info("Successfully reconnected to %s.", 2175 res->hr_remoteaddr); 2176 sync_start(); 2177 } else { 2178 /* Both connections should be NULL. */ 2179 PJDLOG_ASSERT(res->hr_remotein == NULL); 2180 PJDLOG_ASSERT(res->hr_remoteout == NULL); 2181 PJDLOG_ASSERT(in == NULL && out == NULL); 2182 pjdlog_debug(2, "remote_guard: Reconnect to %s failed.", 2183 res->hr_remoteaddr); 2184 } 2185 } 2186 2187 /* 2188 * Thread guards remote connections and reconnects when needed, handles 2189 * signals, etc. 2190 */ 2191 static void * 2192 guard_thread(void *arg) 2193 { 2194 struct hast_resource *res = arg; 2195 unsigned int ii, ncomps; 2196 struct timespec timeout; 2197 time_t lastcheck, now; 2198 sigset_t mask; 2199 int signo; 2200 2201 ncomps = HAST_NCOMPONENTS; 2202 lastcheck = time(NULL); 2203 2204 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 2205 PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0); 2206 PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0); 2207 2208 timeout.tv_sec = HAST_KEEPALIVE; 2209 timeout.tv_nsec = 0; 2210 signo = -1; 2211 2212 for (;;) { 2213 switch (signo) { 2214 case SIGINT: 2215 case SIGTERM: 2216 sigexit_received = true; 2217 primary_exitx(EX_OK, 2218 "Termination signal received, exiting."); 2219 break; 2220 default: 2221 break; 2222 } 2223 2224 /* 2225 * Don't check connections until we fully started, 2226 * as we may still be looping, waiting for remote node 2227 * to switch from primary to secondary. 2228 */ 2229 if (fullystarted) { 2230 pjdlog_debug(2, "remote_guard: Checking connections."); 2231 now = time(NULL); 2232 if (lastcheck + HAST_KEEPALIVE <= now) { 2233 for (ii = 0; ii < ncomps; ii++) 2234 guard_one(res, ii); 2235 lastcheck = now; 2236 } 2237 } 2238 signo = sigtimedwait(&mask, NULL, &timeout); 2239 } 2240 /* NOTREACHED */ 2241 return (NULL); 2242 } 2243