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("$FreeBSD$"); 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 comunicate 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 * Number of seconds to sleep between reconnect retries or keepalive packets. 155 */ 156 #define RETRY_SLEEP 10 157 158 #define ISCONNECTED(res, no) \ 159 ((res)->hr_remotein != NULL && (res)->hr_remoteout != NULL) 160 161 #define QUEUE_INSERT1(hio, name, ncomp) do { \ 162 bool _wakeup; \ 163 \ 164 mtx_lock(&hio_##name##_list_lock[(ncomp)]); \ 165 _wakeup = TAILQ_EMPTY(&hio_##name##_list[(ncomp)]); \ 166 TAILQ_INSERT_TAIL(&hio_##name##_list[(ncomp)], (hio), \ 167 hio_next[(ncomp)]); \ 168 mtx_unlock(&hio_##name##_list_lock[ncomp]); \ 169 if (_wakeup) \ 170 cv_signal(&hio_##name##_list_cond[(ncomp)]); \ 171 } while (0) 172 #define QUEUE_INSERT2(hio, name) do { \ 173 bool _wakeup; \ 174 \ 175 mtx_lock(&hio_##name##_list_lock); \ 176 _wakeup = TAILQ_EMPTY(&hio_##name##_list); \ 177 TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_##name##_next);\ 178 mtx_unlock(&hio_##name##_list_lock); \ 179 if (_wakeup) \ 180 cv_signal(&hio_##name##_list_cond); \ 181 } while (0) 182 #define QUEUE_TAKE1(hio, name, ncomp, timeout) do { \ 183 bool _last; \ 184 \ 185 mtx_lock(&hio_##name##_list_lock[(ncomp)]); \ 186 _last = false; \ 187 while (((hio) = TAILQ_FIRST(&hio_##name##_list[(ncomp)])) == NULL && !_last) { \ 188 cv_timedwait(&hio_##name##_list_cond[(ncomp)], \ 189 &hio_##name##_list_lock[(ncomp)], (timeout)); \ 190 if ((timeout) != 0) \ 191 _last = true; \ 192 } \ 193 if (hio != NULL) { \ 194 TAILQ_REMOVE(&hio_##name##_list[(ncomp)], (hio), \ 195 hio_next[(ncomp)]); \ 196 } \ 197 mtx_unlock(&hio_##name##_list_lock[(ncomp)]); \ 198 } while (0) 199 #define QUEUE_TAKE2(hio, name) do { \ 200 mtx_lock(&hio_##name##_list_lock); \ 201 while (((hio) = TAILQ_FIRST(&hio_##name##_list)) == NULL) { \ 202 cv_wait(&hio_##name##_list_cond, \ 203 &hio_##name##_list_lock); \ 204 } \ 205 TAILQ_REMOVE(&hio_##name##_list, (hio), hio_##name##_next); \ 206 mtx_unlock(&hio_##name##_list_lock); \ 207 } while (0) 208 209 #define SYNCREQ(hio) do { \ 210 (hio)->hio_ggio.gctl_unit = -1; \ 211 (hio)->hio_ggio.gctl_seq = 1; \ 212 } while (0) 213 #define ISSYNCREQ(hio) ((hio)->hio_ggio.gctl_unit == -1) 214 #define SYNCREQDONE(hio) do { (hio)->hio_ggio.gctl_unit = -2; } while (0) 215 #define ISSYNCREQDONE(hio) ((hio)->hio_ggio.gctl_unit == -2) 216 217 static struct hast_resource *gres; 218 219 static pthread_mutex_t range_lock; 220 static struct rangelocks *range_regular; 221 static bool range_regular_wait; 222 static pthread_cond_t range_regular_cond; 223 static struct rangelocks *range_sync; 224 static bool range_sync_wait; 225 static pthread_cond_t range_sync_cond; 226 227 static void *ggate_recv_thread(void *arg); 228 static void *local_send_thread(void *arg); 229 static void *remote_send_thread(void *arg); 230 static void *remote_recv_thread(void *arg); 231 static void *ggate_send_thread(void *arg); 232 static void *sync_thread(void *arg); 233 static void *guard_thread(void *arg); 234 235 static void 236 cleanup(struct hast_resource *res) 237 { 238 int rerrno; 239 240 /* Remember errno. */ 241 rerrno = errno; 242 243 /* Destroy ggate provider if we created one. */ 244 if (res->hr_ggateunit >= 0) { 245 struct g_gate_ctl_destroy ggiod; 246 247 bzero(&ggiod, sizeof(ggiod)); 248 ggiod.gctl_version = G_GATE_VERSION; 249 ggiod.gctl_unit = res->hr_ggateunit; 250 ggiod.gctl_force = 1; 251 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DESTROY, &ggiod) < 0) { 252 pjdlog_errno(LOG_WARNING, 253 "Unable to destroy hast/%s device", 254 res->hr_provname); 255 } 256 res->hr_ggateunit = -1; 257 } 258 259 /* Restore errno. */ 260 errno = rerrno; 261 } 262 263 static __dead2 void 264 primary_exit(int exitcode, const char *fmt, ...) 265 { 266 va_list ap; 267 268 PJDLOG_ASSERT(exitcode != EX_OK); 269 va_start(ap, fmt); 270 pjdlogv_errno(LOG_ERR, fmt, ap); 271 va_end(ap); 272 cleanup(gres); 273 exit(exitcode); 274 } 275 276 static __dead2 void 277 primary_exitx(int exitcode, const char *fmt, ...) 278 { 279 va_list ap; 280 281 va_start(ap, fmt); 282 pjdlogv(exitcode == EX_OK ? LOG_INFO : LOG_ERR, fmt, ap); 283 va_end(ap); 284 cleanup(gres); 285 exit(exitcode); 286 } 287 288 static int 289 hast_activemap_flush(struct hast_resource *res) 290 { 291 const unsigned char *buf; 292 size_t size; 293 294 buf = activemap_bitmap(res->hr_amp, &size); 295 PJDLOG_ASSERT(buf != NULL); 296 PJDLOG_ASSERT((size % res->hr_local_sectorsize) == 0); 297 if (pwrite(res->hr_localfd, buf, size, METADATA_SIZE) != 298 (ssize_t)size) { 299 KEEP_ERRNO(pjdlog_errno(LOG_ERR, 300 "Unable to flush activemap to disk")); 301 return (-1); 302 } 303 return (0); 304 } 305 306 static bool 307 real_remote(const struct hast_resource *res) 308 { 309 310 return (strcmp(res->hr_remoteaddr, "none") != 0); 311 } 312 313 static void 314 init_environment(struct hast_resource *res __unused) 315 { 316 struct hio *hio; 317 unsigned int ii, ncomps; 318 319 /* 320 * In the future it might be per-resource value. 321 */ 322 ncomps = HAST_NCOMPONENTS; 323 324 /* 325 * Allocate memory needed by lists. 326 */ 327 hio_send_list = malloc(sizeof(hio_send_list[0]) * ncomps); 328 if (hio_send_list == NULL) { 329 primary_exitx(EX_TEMPFAIL, 330 "Unable to allocate %zu bytes of memory for send lists.", 331 sizeof(hio_send_list[0]) * ncomps); 332 } 333 hio_send_list_lock = malloc(sizeof(hio_send_list_lock[0]) * ncomps); 334 if (hio_send_list_lock == NULL) { 335 primary_exitx(EX_TEMPFAIL, 336 "Unable to allocate %zu bytes of memory for send list locks.", 337 sizeof(hio_send_list_lock[0]) * ncomps); 338 } 339 hio_send_list_cond = malloc(sizeof(hio_send_list_cond[0]) * ncomps); 340 if (hio_send_list_cond == NULL) { 341 primary_exitx(EX_TEMPFAIL, 342 "Unable to allocate %zu bytes of memory for send list condition variables.", 343 sizeof(hio_send_list_cond[0]) * ncomps); 344 } 345 hio_recv_list = malloc(sizeof(hio_recv_list[0]) * ncomps); 346 if (hio_recv_list == NULL) { 347 primary_exitx(EX_TEMPFAIL, 348 "Unable to allocate %zu bytes of memory for recv lists.", 349 sizeof(hio_recv_list[0]) * ncomps); 350 } 351 hio_recv_list_lock = malloc(sizeof(hio_recv_list_lock[0]) * ncomps); 352 if (hio_recv_list_lock == NULL) { 353 primary_exitx(EX_TEMPFAIL, 354 "Unable to allocate %zu bytes of memory for recv list locks.", 355 sizeof(hio_recv_list_lock[0]) * ncomps); 356 } 357 hio_recv_list_cond = malloc(sizeof(hio_recv_list_cond[0]) * ncomps); 358 if (hio_recv_list_cond == NULL) { 359 primary_exitx(EX_TEMPFAIL, 360 "Unable to allocate %zu bytes of memory for recv list condition variables.", 361 sizeof(hio_recv_list_cond[0]) * ncomps); 362 } 363 hio_remote_lock = malloc(sizeof(hio_remote_lock[0]) * ncomps); 364 if (hio_remote_lock == NULL) { 365 primary_exitx(EX_TEMPFAIL, 366 "Unable to allocate %zu bytes of memory for remote connections locks.", 367 sizeof(hio_remote_lock[0]) * ncomps); 368 } 369 370 /* 371 * Initialize lists, their locks and theirs condition variables. 372 */ 373 TAILQ_INIT(&hio_free_list); 374 mtx_init(&hio_free_list_lock); 375 cv_init(&hio_free_list_cond); 376 for (ii = 0; ii < HAST_NCOMPONENTS; ii++) { 377 TAILQ_INIT(&hio_send_list[ii]); 378 mtx_init(&hio_send_list_lock[ii]); 379 cv_init(&hio_send_list_cond[ii]); 380 TAILQ_INIT(&hio_recv_list[ii]); 381 mtx_init(&hio_recv_list_lock[ii]); 382 cv_init(&hio_recv_list_cond[ii]); 383 rw_init(&hio_remote_lock[ii]); 384 } 385 TAILQ_INIT(&hio_done_list); 386 mtx_init(&hio_done_list_lock); 387 cv_init(&hio_done_list_cond); 388 mtx_init(&metadata_lock); 389 390 /* 391 * Allocate requests pool and initialize requests. 392 */ 393 for (ii = 0; ii < HAST_HIO_MAX; ii++) { 394 hio = malloc(sizeof(*hio)); 395 if (hio == NULL) { 396 primary_exitx(EX_TEMPFAIL, 397 "Unable to allocate %zu bytes of memory for hio request.", 398 sizeof(*hio)); 399 } 400 hio->hio_countdown = 0; 401 hio->hio_errors = malloc(sizeof(hio->hio_errors[0]) * ncomps); 402 if (hio->hio_errors == NULL) { 403 primary_exitx(EX_TEMPFAIL, 404 "Unable allocate %zu bytes of memory for hio errors.", 405 sizeof(hio->hio_errors[0]) * ncomps); 406 } 407 hio->hio_next = malloc(sizeof(hio->hio_next[0]) * ncomps); 408 if (hio->hio_next == NULL) { 409 primary_exitx(EX_TEMPFAIL, 410 "Unable allocate %zu bytes of memory for hio_next field.", 411 sizeof(hio->hio_next[0]) * ncomps); 412 } 413 hio->hio_ggio.gctl_version = G_GATE_VERSION; 414 hio->hio_ggio.gctl_data = malloc(MAXPHYS); 415 if (hio->hio_ggio.gctl_data == NULL) { 416 primary_exitx(EX_TEMPFAIL, 417 "Unable to allocate %zu bytes of memory for gctl_data.", 418 MAXPHYS); 419 } 420 hio->hio_ggio.gctl_length = MAXPHYS; 421 hio->hio_ggio.gctl_error = 0; 422 TAILQ_INSERT_HEAD(&hio_free_list, hio, hio_free_next); 423 } 424 } 425 426 static bool 427 init_resuid(struct hast_resource *res) 428 { 429 430 mtx_lock(&metadata_lock); 431 if (res->hr_resuid != 0) { 432 mtx_unlock(&metadata_lock); 433 return (false); 434 } else { 435 /* Initialize unique resource identifier. */ 436 arc4random_buf(&res->hr_resuid, sizeof(res->hr_resuid)); 437 mtx_unlock(&metadata_lock); 438 if (metadata_write(res) < 0) 439 exit(EX_NOINPUT); 440 return (true); 441 } 442 } 443 444 static void 445 init_local(struct hast_resource *res) 446 { 447 unsigned char *buf; 448 size_t mapsize; 449 450 if (metadata_read(res, true) < 0) 451 exit(EX_NOINPUT); 452 mtx_init(&res->hr_amp_lock); 453 if (activemap_init(&res->hr_amp, res->hr_datasize, res->hr_extentsize, 454 res->hr_local_sectorsize, res->hr_keepdirty) < 0) { 455 primary_exit(EX_TEMPFAIL, "Unable to create activemap"); 456 } 457 mtx_init(&range_lock); 458 cv_init(&range_regular_cond); 459 if (rangelock_init(&range_regular) < 0) 460 primary_exit(EX_TEMPFAIL, "Unable to create regular range lock"); 461 cv_init(&range_sync_cond); 462 if (rangelock_init(&range_sync) < 0) 463 primary_exit(EX_TEMPFAIL, "Unable to create sync range lock"); 464 mapsize = activemap_ondisk_size(res->hr_amp); 465 buf = calloc(1, mapsize); 466 if (buf == NULL) { 467 primary_exitx(EX_TEMPFAIL, 468 "Unable to allocate buffer for activemap."); 469 } 470 if (pread(res->hr_localfd, buf, mapsize, METADATA_SIZE) != 471 (ssize_t)mapsize) { 472 primary_exit(EX_NOINPUT, "Unable to read activemap"); 473 } 474 activemap_copyin(res->hr_amp, buf, mapsize); 475 free(buf); 476 if (res->hr_resuid != 0) 477 return; 478 /* 479 * We're using provider for the first time. Initialize local and remote 480 * counters. We don't initialize resuid here, as we want to do it just 481 * in time. The reason for this is that we want to inform secondary 482 * that there were no writes yet, so there is no need to synchronize 483 * anything. 484 */ 485 res->hr_primary_localcnt = 1; 486 res->hr_primary_remotecnt = 0; 487 if (metadata_write(res) < 0) 488 exit(EX_NOINPUT); 489 } 490 491 static int 492 primary_connect(struct hast_resource *res, struct proto_conn **connp) 493 { 494 struct proto_conn *conn; 495 int16_t val; 496 497 val = 1; 498 if (proto_send(res->hr_conn, &val, sizeof(val)) < 0) { 499 primary_exit(EX_TEMPFAIL, 500 "Unable to send connection request to parent"); 501 } 502 if (proto_recv(res->hr_conn, &val, sizeof(val)) < 0) { 503 primary_exit(EX_TEMPFAIL, 504 "Unable to receive reply to connection request from parent"); 505 } 506 if (val != 0) { 507 errno = val; 508 pjdlog_errno(LOG_WARNING, "Unable to connect to %s", 509 res->hr_remoteaddr); 510 return (-1); 511 } 512 if (proto_connection_recv(res->hr_conn, true, &conn) < 0) { 513 primary_exit(EX_TEMPFAIL, 514 "Unable to receive connection from parent"); 515 } 516 if (proto_connect_wait(conn, HAST_TIMEOUT) < 0) { 517 pjdlog_errno(LOG_WARNING, "Unable to connect to %s", 518 res->hr_remoteaddr); 519 proto_close(conn); 520 return (-1); 521 } 522 /* Error in setting timeout is not critical, but why should it fail? */ 523 if (proto_timeout(conn, res->hr_timeout) < 0) 524 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 525 526 *connp = conn; 527 528 return (0); 529 } 530 531 static bool 532 init_remote(struct hast_resource *res, struct proto_conn **inp, 533 struct proto_conn **outp) 534 { 535 struct proto_conn *in, *out; 536 struct nv *nvout, *nvin; 537 const unsigned char *token; 538 unsigned char *map; 539 const char *errmsg; 540 int32_t extentsize; 541 int64_t datasize; 542 uint32_t mapsize; 543 size_t size; 544 545 PJDLOG_ASSERT((inp == NULL && outp == NULL) || (inp != NULL && outp != NULL)); 546 PJDLOG_ASSERT(real_remote(res)); 547 548 in = out = NULL; 549 errmsg = NULL; 550 551 if (primary_connect(res, &out) == -1) 552 return (false); 553 554 /* 555 * First handshake step. 556 * Setup outgoing connection with remote node. 557 */ 558 nvout = nv_alloc(); 559 nv_add_string(nvout, res->hr_name, "resource"); 560 if (nv_error(nvout) != 0) { 561 pjdlog_common(LOG_WARNING, 0, nv_error(nvout), 562 "Unable to allocate header for connection with %s", 563 res->hr_remoteaddr); 564 nv_free(nvout); 565 goto close; 566 } 567 if (hast_proto_send(res, out, nvout, NULL, 0) < 0) { 568 pjdlog_errno(LOG_WARNING, 569 "Unable to send handshake header to %s", 570 res->hr_remoteaddr); 571 nv_free(nvout); 572 goto close; 573 } 574 nv_free(nvout); 575 if (hast_proto_recv_hdr(out, &nvin) < 0) { 576 pjdlog_errno(LOG_WARNING, 577 "Unable to receive handshake header from %s", 578 res->hr_remoteaddr); 579 goto close; 580 } 581 errmsg = nv_get_string(nvin, "errmsg"); 582 if (errmsg != NULL) { 583 pjdlog_warning("%s", errmsg); 584 nv_free(nvin); 585 goto close; 586 } 587 token = nv_get_uint8_array(nvin, &size, "token"); 588 if (token == NULL) { 589 pjdlog_warning("Handshake header from %s has no 'token' field.", 590 res->hr_remoteaddr); 591 nv_free(nvin); 592 goto close; 593 } 594 if (size != sizeof(res->hr_token)) { 595 pjdlog_warning("Handshake header from %s contains 'token' of wrong size (got %zu, expected %zu).", 596 res->hr_remoteaddr, size, sizeof(res->hr_token)); 597 nv_free(nvin); 598 goto close; 599 } 600 bcopy(token, res->hr_token, sizeof(res->hr_token)); 601 nv_free(nvin); 602 603 /* 604 * Second handshake step. 605 * Setup incoming connection with remote node. 606 */ 607 if (primary_connect(res, &in) == -1) 608 goto close; 609 610 nvout = nv_alloc(); 611 nv_add_string(nvout, res->hr_name, "resource"); 612 nv_add_uint8_array(nvout, res->hr_token, sizeof(res->hr_token), 613 "token"); 614 if (res->hr_resuid == 0) { 615 /* 616 * The resuid field was not yet initialized. 617 * Because we do synchronization inside init_resuid(), it is 618 * possible that someone already initialized it, the function 619 * will return false then, but if we successfully initialized 620 * it, we will get true. True means that there were no writes 621 * to this resource yet and we want to inform secondary that 622 * synchronization is not needed by sending "virgin" argument. 623 */ 624 if (init_resuid(res)) 625 nv_add_int8(nvout, 1, "virgin"); 626 } 627 nv_add_uint64(nvout, res->hr_resuid, "resuid"); 628 nv_add_uint64(nvout, res->hr_primary_localcnt, "localcnt"); 629 nv_add_uint64(nvout, res->hr_primary_remotecnt, "remotecnt"); 630 if (nv_error(nvout) != 0) { 631 pjdlog_common(LOG_WARNING, 0, nv_error(nvout), 632 "Unable to allocate header for connection with %s", 633 res->hr_remoteaddr); 634 nv_free(nvout); 635 goto close; 636 } 637 if (hast_proto_send(res, in, nvout, NULL, 0) < 0) { 638 pjdlog_errno(LOG_WARNING, 639 "Unable to send handshake header to %s", 640 res->hr_remoteaddr); 641 nv_free(nvout); 642 goto close; 643 } 644 nv_free(nvout); 645 if (hast_proto_recv_hdr(out, &nvin) < 0) { 646 pjdlog_errno(LOG_WARNING, 647 "Unable to receive handshake header from %s", 648 res->hr_remoteaddr); 649 goto close; 650 } 651 errmsg = nv_get_string(nvin, "errmsg"); 652 if (errmsg != NULL) { 653 pjdlog_warning("%s", errmsg); 654 nv_free(nvin); 655 goto close; 656 } 657 datasize = nv_get_int64(nvin, "datasize"); 658 if (datasize != res->hr_datasize) { 659 pjdlog_warning("Data size differs between nodes (local=%jd, remote=%jd).", 660 (intmax_t)res->hr_datasize, (intmax_t)datasize); 661 nv_free(nvin); 662 goto close; 663 } 664 extentsize = nv_get_int32(nvin, "extentsize"); 665 if (extentsize != res->hr_extentsize) { 666 pjdlog_warning("Extent size differs between nodes (local=%zd, remote=%zd).", 667 (ssize_t)res->hr_extentsize, (ssize_t)extentsize); 668 nv_free(nvin); 669 goto close; 670 } 671 res->hr_secondary_localcnt = nv_get_uint64(nvin, "localcnt"); 672 res->hr_secondary_remotecnt = nv_get_uint64(nvin, "remotecnt"); 673 res->hr_syncsrc = nv_get_uint8(nvin, "syncsrc"); 674 map = NULL; 675 mapsize = nv_get_uint32(nvin, "mapsize"); 676 if (mapsize > 0) { 677 map = malloc(mapsize); 678 if (map == NULL) { 679 pjdlog_error("Unable to allocate memory for remote activemap (mapsize=%ju).", 680 (uintmax_t)mapsize); 681 nv_free(nvin); 682 goto close; 683 } 684 /* 685 * Remote node have some dirty extents on its own, lets 686 * download its activemap. 687 */ 688 if (hast_proto_recv_data(res, out, nvin, map, 689 mapsize) < 0) { 690 pjdlog_errno(LOG_ERR, 691 "Unable to receive remote activemap"); 692 nv_free(nvin); 693 free(map); 694 goto close; 695 } 696 /* 697 * Merge local and remote bitmaps. 698 */ 699 activemap_merge(res->hr_amp, map, mapsize); 700 free(map); 701 /* 702 * Now that we merged bitmaps from both nodes, flush it to the 703 * disk before we start to synchronize. 704 */ 705 (void)hast_activemap_flush(res); 706 } 707 nv_free(nvin); 708 pjdlog_info("Connected to %s.", res->hr_remoteaddr); 709 if (inp != NULL && outp != NULL) { 710 *inp = in; 711 *outp = out; 712 } else { 713 res->hr_remotein = in; 714 res->hr_remoteout = out; 715 } 716 event_send(res, EVENT_CONNECT); 717 return (true); 718 close: 719 if (errmsg != NULL && strcmp(errmsg, "Split-brain condition!") == 0) 720 event_send(res, EVENT_SPLITBRAIN); 721 proto_close(out); 722 if (in != NULL) 723 proto_close(in); 724 return (false); 725 } 726 727 static void 728 sync_start(void) 729 { 730 731 mtx_lock(&sync_lock); 732 sync_inprogress = true; 733 mtx_unlock(&sync_lock); 734 cv_signal(&sync_cond); 735 } 736 737 static void 738 sync_stop(void) 739 { 740 741 mtx_lock(&sync_lock); 742 if (sync_inprogress) 743 sync_inprogress = false; 744 mtx_unlock(&sync_lock); 745 } 746 747 static void 748 init_ggate(struct hast_resource *res) 749 { 750 struct g_gate_ctl_create ggiocreate; 751 struct g_gate_ctl_cancel ggiocancel; 752 753 /* 754 * We communicate with ggate via /dev/ggctl. Open it. 755 */ 756 res->hr_ggatefd = open("/dev/" G_GATE_CTL_NAME, O_RDWR); 757 if (res->hr_ggatefd < 0) 758 primary_exit(EX_OSFILE, "Unable to open /dev/" G_GATE_CTL_NAME); 759 /* 760 * Create provider before trying to connect, as connection failure 761 * is not critical, but may take some time. 762 */ 763 bzero(&ggiocreate, sizeof(ggiocreate)); 764 ggiocreate.gctl_version = G_GATE_VERSION; 765 ggiocreate.gctl_mediasize = res->hr_datasize; 766 ggiocreate.gctl_sectorsize = res->hr_local_sectorsize; 767 ggiocreate.gctl_flags = 0; 768 ggiocreate.gctl_maxcount = G_GATE_MAX_QUEUE_SIZE; 769 ggiocreate.gctl_timeout = 0; 770 ggiocreate.gctl_unit = G_GATE_NAME_GIVEN; 771 snprintf(ggiocreate.gctl_name, sizeof(ggiocreate.gctl_name), "hast/%s", 772 res->hr_provname); 773 if (ioctl(res->hr_ggatefd, G_GATE_CMD_CREATE, &ggiocreate) == 0) { 774 pjdlog_info("Device hast/%s created.", res->hr_provname); 775 res->hr_ggateunit = ggiocreate.gctl_unit; 776 return; 777 } 778 if (errno != EEXIST) { 779 primary_exit(EX_OSERR, "Unable to create hast/%s device", 780 res->hr_provname); 781 } 782 pjdlog_debug(1, 783 "Device hast/%s already exists, we will try to take it over.", 784 res->hr_provname); 785 /* 786 * If we received EEXIST, we assume that the process who created the 787 * provider died and didn't clean up. In that case we will start from 788 * where he left of. 789 */ 790 bzero(&ggiocancel, sizeof(ggiocancel)); 791 ggiocancel.gctl_version = G_GATE_VERSION; 792 ggiocancel.gctl_unit = G_GATE_NAME_GIVEN; 793 snprintf(ggiocancel.gctl_name, sizeof(ggiocancel.gctl_name), "hast/%s", 794 res->hr_provname); 795 if (ioctl(res->hr_ggatefd, G_GATE_CMD_CANCEL, &ggiocancel) == 0) { 796 pjdlog_info("Device hast/%s recovered.", res->hr_provname); 797 res->hr_ggateunit = ggiocancel.gctl_unit; 798 return; 799 } 800 primary_exit(EX_OSERR, "Unable to take over hast/%s device", 801 res->hr_provname); 802 } 803 804 void 805 hastd_primary(struct hast_resource *res) 806 { 807 pthread_t td; 808 pid_t pid; 809 int error, mode; 810 811 /* 812 * Create communication channel for sending control commands from 813 * parent to child. 814 */ 815 if (proto_client("socketpair://", &res->hr_ctrl) < 0) { 816 /* TODO: There's no need for this to be fatal error. */ 817 KEEP_ERRNO((void)pidfile_remove(pfh)); 818 pjdlog_exit(EX_OSERR, 819 "Unable to create control sockets between parent and child"); 820 } 821 /* 822 * Create communication channel for sending events from child to parent. 823 */ 824 if (proto_client("socketpair://", &res->hr_event) < 0) { 825 /* TODO: There's no need for this to be fatal error. */ 826 KEEP_ERRNO((void)pidfile_remove(pfh)); 827 pjdlog_exit(EX_OSERR, 828 "Unable to create event sockets between child and parent"); 829 } 830 /* 831 * Create communication channel for sending connection requests from 832 * child to parent. 833 */ 834 if (proto_client("socketpair://", &res->hr_conn) < 0) { 835 /* TODO: There's no need for this to be fatal error. */ 836 KEEP_ERRNO((void)pidfile_remove(pfh)); 837 pjdlog_exit(EX_OSERR, 838 "Unable to create connection sockets between child and parent"); 839 } 840 841 pid = fork(); 842 if (pid < 0) { 843 /* TODO: There's no need for this to be fatal error. */ 844 KEEP_ERRNO((void)pidfile_remove(pfh)); 845 pjdlog_exit(EX_TEMPFAIL, "Unable to fork"); 846 } 847 848 if (pid > 0) { 849 /* This is parent. */ 850 /* Declare that we are receiver. */ 851 proto_recv(res->hr_event, NULL, 0); 852 proto_recv(res->hr_conn, NULL, 0); 853 /* Declare that we are sender. */ 854 proto_send(res->hr_ctrl, NULL, 0); 855 res->hr_workerpid = pid; 856 return; 857 } 858 859 gres = res; 860 mode = pjdlog_mode_get(); 861 862 /* Declare that we are sender. */ 863 proto_send(res->hr_event, NULL, 0); 864 proto_send(res->hr_conn, NULL, 0); 865 /* Declare that we are receiver. */ 866 proto_recv(res->hr_ctrl, NULL, 0); 867 descriptors_cleanup(res); 868 869 descriptors_assert(res, mode); 870 871 pjdlog_init(mode); 872 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 873 setproctitle("%s (primary)", res->hr_name); 874 875 init_local(res); 876 init_ggate(res); 877 init_environment(res); 878 879 if (drop_privs() != 0) { 880 cleanup(res); 881 exit(EX_CONFIG); 882 } 883 pjdlog_info("Privileges successfully dropped."); 884 885 /* 886 * Create the guard thread first, so we can handle signals from the 887 * very begining. 888 */ 889 error = pthread_create(&td, NULL, guard_thread, res); 890 PJDLOG_ASSERT(error == 0); 891 /* 892 * Create the control thread before sending any event to the parent, 893 * as we can deadlock when parent sends control request to worker, 894 * but worker has no control thread started yet, so parent waits. 895 * In the meantime worker sends an event to the parent, but parent 896 * is unable to handle the event, because it waits for control 897 * request response. 898 */ 899 error = pthread_create(&td, NULL, ctrl_thread, res); 900 PJDLOG_ASSERT(error == 0); 901 if (real_remote(res) && init_remote(res, NULL, NULL)) 902 sync_start(); 903 error = pthread_create(&td, NULL, ggate_recv_thread, res); 904 PJDLOG_ASSERT(error == 0); 905 error = pthread_create(&td, NULL, local_send_thread, res); 906 PJDLOG_ASSERT(error == 0); 907 error = pthread_create(&td, NULL, remote_send_thread, res); 908 PJDLOG_ASSERT(error == 0); 909 error = pthread_create(&td, NULL, remote_recv_thread, res); 910 PJDLOG_ASSERT(error == 0); 911 error = pthread_create(&td, NULL, ggate_send_thread, res); 912 PJDLOG_ASSERT(error == 0); 913 (void)sync_thread(res); 914 } 915 916 static void 917 reqlog(int loglevel, int debuglevel, struct g_gate_ctl_io *ggio, const char *fmt, ...) 918 { 919 char msg[1024]; 920 va_list ap; 921 int len; 922 923 va_start(ap, fmt); 924 len = vsnprintf(msg, sizeof(msg), fmt, ap); 925 va_end(ap); 926 if ((size_t)len < sizeof(msg)) { 927 switch (ggio->gctl_cmd) { 928 case BIO_READ: 929 (void)snprintf(msg + len, sizeof(msg) - len, 930 "READ(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 931 (uintmax_t)ggio->gctl_length); 932 break; 933 case BIO_DELETE: 934 (void)snprintf(msg + len, sizeof(msg) - len, 935 "DELETE(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 936 (uintmax_t)ggio->gctl_length); 937 break; 938 case BIO_FLUSH: 939 (void)snprintf(msg + len, sizeof(msg) - len, "FLUSH."); 940 break; 941 case BIO_WRITE: 942 (void)snprintf(msg + len, sizeof(msg) - len, 943 "WRITE(%ju, %ju).", (uintmax_t)ggio->gctl_offset, 944 (uintmax_t)ggio->gctl_length); 945 break; 946 default: 947 (void)snprintf(msg + len, sizeof(msg) - len, 948 "UNKNOWN(%u).", (unsigned int)ggio->gctl_cmd); 949 break; 950 } 951 } 952 pjdlog_common(loglevel, debuglevel, -1, "%s", msg); 953 } 954 955 static void 956 remote_close(struct hast_resource *res, int ncomp) 957 { 958 959 rw_wlock(&hio_remote_lock[ncomp]); 960 /* 961 * A race is possible between dropping rlock and acquiring wlock - 962 * another thread can close connection in-between. 963 */ 964 if (!ISCONNECTED(res, ncomp)) { 965 PJDLOG_ASSERT(res->hr_remotein == NULL); 966 PJDLOG_ASSERT(res->hr_remoteout == NULL); 967 rw_unlock(&hio_remote_lock[ncomp]); 968 return; 969 } 970 971 PJDLOG_ASSERT(res->hr_remotein != NULL); 972 PJDLOG_ASSERT(res->hr_remoteout != NULL); 973 974 pjdlog_debug(2, "Closing incoming connection to %s.", 975 res->hr_remoteaddr); 976 proto_close(res->hr_remotein); 977 res->hr_remotein = NULL; 978 pjdlog_debug(2, "Closing outgoing connection to %s.", 979 res->hr_remoteaddr); 980 proto_close(res->hr_remoteout); 981 res->hr_remoteout = NULL; 982 983 rw_unlock(&hio_remote_lock[ncomp]); 984 985 pjdlog_warning("Disconnected from %s.", res->hr_remoteaddr); 986 987 /* 988 * Stop synchronization if in-progress. 989 */ 990 sync_stop(); 991 992 event_send(res, EVENT_DISCONNECT); 993 } 994 995 /* 996 * Thread receives ggate I/O requests from the kernel and passes them to 997 * appropriate threads: 998 * WRITE - always goes to both local_send and remote_send threads 999 * READ (when the block is up-to-date on local component) - 1000 * only local_send thread 1001 * READ (when the block isn't up-to-date on local component) - 1002 * only remote_send thread 1003 * DELETE - always goes to both local_send and remote_send threads 1004 * FLUSH - always goes to both local_send and remote_send threads 1005 */ 1006 static void * 1007 ggate_recv_thread(void *arg) 1008 { 1009 struct hast_resource *res = arg; 1010 struct g_gate_ctl_io *ggio; 1011 struct hio *hio; 1012 unsigned int ii, ncomp, ncomps; 1013 int error; 1014 1015 ncomps = HAST_NCOMPONENTS; 1016 1017 for (;;) { 1018 pjdlog_debug(2, "ggate_recv: Taking free request."); 1019 QUEUE_TAKE2(hio, free); 1020 pjdlog_debug(2, "ggate_recv: (%p) Got free request.", hio); 1021 ggio = &hio->hio_ggio; 1022 ggio->gctl_unit = res->hr_ggateunit; 1023 ggio->gctl_length = MAXPHYS; 1024 ggio->gctl_error = 0; 1025 pjdlog_debug(2, 1026 "ggate_recv: (%p) Waiting for request from the kernel.", 1027 hio); 1028 if (ioctl(res->hr_ggatefd, G_GATE_CMD_START, ggio) < 0) { 1029 if (sigexit_received) 1030 pthread_exit(NULL); 1031 primary_exit(EX_OSERR, "G_GATE_CMD_START failed"); 1032 } 1033 error = ggio->gctl_error; 1034 switch (error) { 1035 case 0: 1036 break; 1037 case ECANCELED: 1038 /* Exit gracefully. */ 1039 if (!sigexit_received) { 1040 pjdlog_debug(2, 1041 "ggate_recv: (%p) Received cancel from the kernel.", 1042 hio); 1043 pjdlog_info("Received cancel from the kernel, exiting."); 1044 } 1045 pthread_exit(NULL); 1046 case ENOMEM: 1047 /* 1048 * Buffer too small? Impossible, we allocate MAXPHYS 1049 * bytes - request can't be bigger than that. 1050 */ 1051 /* FALLTHROUGH */ 1052 case ENXIO: 1053 default: 1054 primary_exitx(EX_OSERR, "G_GATE_CMD_START failed: %s.", 1055 strerror(error)); 1056 } 1057 for (ii = 0; ii < ncomps; ii++) 1058 hio->hio_errors[ii] = EINVAL; 1059 reqlog(LOG_DEBUG, 2, ggio, 1060 "ggate_recv: (%p) Request received from the kernel: ", 1061 hio); 1062 /* 1063 * Inform all components about new write request. 1064 * For read request prefer local component unless the given 1065 * range is out-of-date, then use remote component. 1066 */ 1067 switch (ggio->gctl_cmd) { 1068 case BIO_READ: 1069 pjdlog_debug(2, 1070 "ggate_recv: (%p) Moving request to the send queue.", 1071 hio); 1072 refcount_init(&hio->hio_countdown, 1); 1073 mtx_lock(&metadata_lock); 1074 if (res->hr_syncsrc == HAST_SYNCSRC_UNDEF || 1075 res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1076 /* 1077 * This range is up-to-date on local component, 1078 * so handle request locally. 1079 */ 1080 /* Local component is 0 for now. */ 1081 ncomp = 0; 1082 } else /* if (res->hr_syncsrc == 1083 HAST_SYNCSRC_SECONDARY) */ { 1084 PJDLOG_ASSERT(res->hr_syncsrc == 1085 HAST_SYNCSRC_SECONDARY); 1086 /* 1087 * This range is out-of-date on local component, 1088 * so send request to the remote node. 1089 */ 1090 /* Remote component is 1 for now. */ 1091 ncomp = 1; 1092 } 1093 mtx_unlock(&metadata_lock); 1094 QUEUE_INSERT1(hio, send, ncomp); 1095 break; 1096 case BIO_WRITE: 1097 if (res->hr_resuid == 0) { 1098 /* This is first write, initialize resuid. */ 1099 (void)init_resuid(res); 1100 } 1101 for (;;) { 1102 mtx_lock(&range_lock); 1103 if (rangelock_islocked(range_sync, 1104 ggio->gctl_offset, ggio->gctl_length)) { 1105 pjdlog_debug(2, 1106 "regular: Range offset=%jd length=%zu locked.", 1107 (intmax_t)ggio->gctl_offset, 1108 (size_t)ggio->gctl_length); 1109 range_regular_wait = true; 1110 cv_wait(&range_regular_cond, &range_lock); 1111 range_regular_wait = false; 1112 mtx_unlock(&range_lock); 1113 continue; 1114 } 1115 if (rangelock_add(range_regular, 1116 ggio->gctl_offset, ggio->gctl_length) < 0) { 1117 mtx_unlock(&range_lock); 1118 pjdlog_debug(2, 1119 "regular: Range offset=%jd length=%zu is already locked, waiting.", 1120 (intmax_t)ggio->gctl_offset, 1121 (size_t)ggio->gctl_length); 1122 sleep(1); 1123 continue; 1124 } 1125 mtx_unlock(&range_lock); 1126 break; 1127 } 1128 mtx_lock(&res->hr_amp_lock); 1129 if (activemap_write_start(res->hr_amp, 1130 ggio->gctl_offset, ggio->gctl_length)) { 1131 (void)hast_activemap_flush(res); 1132 } 1133 mtx_unlock(&res->hr_amp_lock); 1134 /* FALLTHROUGH */ 1135 case BIO_DELETE: 1136 case BIO_FLUSH: 1137 pjdlog_debug(2, 1138 "ggate_recv: (%p) Moving request to the send queues.", 1139 hio); 1140 refcount_init(&hio->hio_countdown, ncomps); 1141 for (ii = 0; ii < ncomps; ii++) 1142 QUEUE_INSERT1(hio, send, ii); 1143 break; 1144 } 1145 } 1146 /* NOTREACHED */ 1147 return (NULL); 1148 } 1149 1150 /* 1151 * Thread reads from or writes to local component. 1152 * If local read fails, it redirects it to remote_send thread. 1153 */ 1154 static void * 1155 local_send_thread(void *arg) 1156 { 1157 struct hast_resource *res = arg; 1158 struct g_gate_ctl_io *ggio; 1159 struct hio *hio; 1160 unsigned int ncomp, rncomp; 1161 ssize_t ret; 1162 1163 /* Local component is 0 for now. */ 1164 ncomp = 0; 1165 /* Remote component is 1 for now. */ 1166 rncomp = 1; 1167 1168 for (;;) { 1169 pjdlog_debug(2, "local_send: Taking request."); 1170 QUEUE_TAKE1(hio, send, ncomp, 0); 1171 pjdlog_debug(2, "local_send: (%p) Got request.", hio); 1172 ggio = &hio->hio_ggio; 1173 switch (ggio->gctl_cmd) { 1174 case BIO_READ: 1175 ret = pread(res->hr_localfd, ggio->gctl_data, 1176 ggio->gctl_length, 1177 ggio->gctl_offset + res->hr_localoff); 1178 if (ret == ggio->gctl_length) 1179 hio->hio_errors[ncomp] = 0; 1180 else { 1181 /* 1182 * If READ failed, try to read from remote node. 1183 */ 1184 if (ret < 0) { 1185 reqlog(LOG_WARNING, 0, ggio, 1186 "Local request failed (%s), trying remote node. ", 1187 strerror(errno)); 1188 } else if (ret != ggio->gctl_length) { 1189 reqlog(LOG_WARNING, 0, ggio, 1190 "Local request failed (%zd != %jd), trying remote node. ", 1191 ret, (intmax_t)ggio->gctl_length); 1192 } 1193 QUEUE_INSERT1(hio, send, rncomp); 1194 continue; 1195 } 1196 break; 1197 case BIO_WRITE: 1198 ret = pwrite(res->hr_localfd, ggio->gctl_data, 1199 ggio->gctl_length, 1200 ggio->gctl_offset + res->hr_localoff); 1201 if (ret < 0) { 1202 hio->hio_errors[ncomp] = errno; 1203 reqlog(LOG_WARNING, 0, ggio, 1204 "Local request failed (%s): ", 1205 strerror(errno)); 1206 } else if (ret != ggio->gctl_length) { 1207 hio->hio_errors[ncomp] = EIO; 1208 reqlog(LOG_WARNING, 0, ggio, 1209 "Local request failed (%zd != %jd): ", 1210 ret, (intmax_t)ggio->gctl_length); 1211 } else { 1212 hio->hio_errors[ncomp] = 0; 1213 } 1214 break; 1215 case BIO_DELETE: 1216 ret = g_delete(res->hr_localfd, 1217 ggio->gctl_offset + res->hr_localoff, 1218 ggio->gctl_length); 1219 if (ret < 0) { 1220 hio->hio_errors[ncomp] = errno; 1221 reqlog(LOG_WARNING, 0, ggio, 1222 "Local request failed (%s): ", 1223 strerror(errno)); 1224 } else { 1225 hio->hio_errors[ncomp] = 0; 1226 } 1227 break; 1228 case BIO_FLUSH: 1229 ret = g_flush(res->hr_localfd); 1230 if (ret < 0) { 1231 hio->hio_errors[ncomp] = errno; 1232 reqlog(LOG_WARNING, 0, ggio, 1233 "Local request failed (%s): ", 1234 strerror(errno)); 1235 } else { 1236 hio->hio_errors[ncomp] = 0; 1237 } 1238 break; 1239 } 1240 if (refcount_release(&hio->hio_countdown)) { 1241 if (ISSYNCREQ(hio)) { 1242 mtx_lock(&sync_lock); 1243 SYNCREQDONE(hio); 1244 mtx_unlock(&sync_lock); 1245 cv_signal(&sync_cond); 1246 } else { 1247 pjdlog_debug(2, 1248 "local_send: (%p) Moving request to the done queue.", 1249 hio); 1250 QUEUE_INSERT2(hio, done); 1251 } 1252 } 1253 } 1254 /* NOTREACHED */ 1255 return (NULL); 1256 } 1257 1258 static void 1259 keepalive_send(struct hast_resource *res, unsigned int ncomp) 1260 { 1261 struct nv *nv; 1262 1263 rw_rlock(&hio_remote_lock[ncomp]); 1264 1265 if (!ISCONNECTED(res, ncomp)) { 1266 rw_unlock(&hio_remote_lock[ncomp]); 1267 return; 1268 } 1269 1270 PJDLOG_ASSERT(res->hr_remotein != NULL); 1271 PJDLOG_ASSERT(res->hr_remoteout != NULL); 1272 1273 nv = nv_alloc(); 1274 nv_add_uint8(nv, HIO_KEEPALIVE, "cmd"); 1275 if (nv_error(nv) != 0) { 1276 rw_unlock(&hio_remote_lock[ncomp]); 1277 nv_free(nv); 1278 pjdlog_debug(1, 1279 "keepalive_send: Unable to prepare header to send."); 1280 return; 1281 } 1282 if (hast_proto_send(res, res->hr_remoteout, nv, NULL, 0) < 0) { 1283 rw_unlock(&hio_remote_lock[ncomp]); 1284 pjdlog_common(LOG_DEBUG, 1, errno, 1285 "keepalive_send: Unable to send request"); 1286 nv_free(nv); 1287 remote_close(res, ncomp); 1288 return; 1289 } 1290 1291 rw_unlock(&hio_remote_lock[ncomp]); 1292 nv_free(nv); 1293 pjdlog_debug(2, "keepalive_send: Request sent."); 1294 } 1295 1296 /* 1297 * Thread sends request to secondary node. 1298 */ 1299 static void * 1300 remote_send_thread(void *arg) 1301 { 1302 struct hast_resource *res = arg; 1303 struct g_gate_ctl_io *ggio; 1304 time_t lastcheck, now; 1305 struct hio *hio; 1306 struct nv *nv; 1307 unsigned int ncomp; 1308 bool wakeup; 1309 uint64_t offset, length; 1310 uint8_t cmd; 1311 void *data; 1312 1313 /* Remote component is 1 for now. */ 1314 ncomp = 1; 1315 lastcheck = time(NULL); 1316 1317 for (;;) { 1318 pjdlog_debug(2, "remote_send: Taking request."); 1319 QUEUE_TAKE1(hio, send, ncomp, RETRY_SLEEP); 1320 if (hio == NULL) { 1321 now = time(NULL); 1322 if (lastcheck + RETRY_SLEEP <= now) { 1323 keepalive_send(res, ncomp); 1324 lastcheck = now; 1325 } 1326 continue; 1327 } 1328 pjdlog_debug(2, "remote_send: (%p) Got request.", hio); 1329 ggio = &hio->hio_ggio; 1330 switch (ggio->gctl_cmd) { 1331 case BIO_READ: 1332 cmd = HIO_READ; 1333 data = NULL; 1334 offset = ggio->gctl_offset; 1335 length = ggio->gctl_length; 1336 break; 1337 case BIO_WRITE: 1338 cmd = HIO_WRITE; 1339 data = ggio->gctl_data; 1340 offset = ggio->gctl_offset; 1341 length = ggio->gctl_length; 1342 break; 1343 case BIO_DELETE: 1344 cmd = HIO_DELETE; 1345 data = NULL; 1346 offset = ggio->gctl_offset; 1347 length = ggio->gctl_length; 1348 break; 1349 case BIO_FLUSH: 1350 cmd = HIO_FLUSH; 1351 data = NULL; 1352 offset = 0; 1353 length = 0; 1354 break; 1355 default: 1356 PJDLOG_ASSERT(!"invalid condition"); 1357 abort(); 1358 } 1359 nv = nv_alloc(); 1360 nv_add_uint8(nv, cmd, "cmd"); 1361 nv_add_uint64(nv, (uint64_t)ggio->gctl_seq, "seq"); 1362 nv_add_uint64(nv, offset, "offset"); 1363 nv_add_uint64(nv, length, "length"); 1364 if (nv_error(nv) != 0) { 1365 hio->hio_errors[ncomp] = nv_error(nv); 1366 pjdlog_debug(2, 1367 "remote_send: (%p) Unable to prepare header to send.", 1368 hio); 1369 reqlog(LOG_ERR, 0, ggio, 1370 "Unable to prepare header to send (%s): ", 1371 strerror(nv_error(nv))); 1372 /* Move failed request immediately to the done queue. */ 1373 goto done_queue; 1374 } 1375 pjdlog_debug(2, 1376 "remote_send: (%p) Moving request to the recv queue.", 1377 hio); 1378 /* 1379 * Protect connection from disappearing. 1380 */ 1381 rw_rlock(&hio_remote_lock[ncomp]); 1382 if (!ISCONNECTED(res, ncomp)) { 1383 rw_unlock(&hio_remote_lock[ncomp]); 1384 hio->hio_errors[ncomp] = ENOTCONN; 1385 goto done_queue; 1386 } 1387 /* 1388 * Move the request to recv queue before sending it, because 1389 * in different order we can get reply before we move request 1390 * to recv queue. 1391 */ 1392 mtx_lock(&hio_recv_list_lock[ncomp]); 1393 wakeup = TAILQ_EMPTY(&hio_recv_list[ncomp]); 1394 TAILQ_INSERT_TAIL(&hio_recv_list[ncomp], hio, hio_next[ncomp]); 1395 mtx_unlock(&hio_recv_list_lock[ncomp]); 1396 if (hast_proto_send(res, res->hr_remoteout, nv, data, 1397 data != NULL ? length : 0) < 0) { 1398 hio->hio_errors[ncomp] = errno; 1399 rw_unlock(&hio_remote_lock[ncomp]); 1400 pjdlog_debug(2, 1401 "remote_send: (%p) Unable to send request.", hio); 1402 reqlog(LOG_ERR, 0, ggio, 1403 "Unable to send request (%s): ", 1404 strerror(hio->hio_errors[ncomp])); 1405 remote_close(res, ncomp); 1406 /* 1407 * Take request back from the receive queue and move 1408 * it immediately to the done queue. 1409 */ 1410 mtx_lock(&hio_recv_list_lock[ncomp]); 1411 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, hio_next[ncomp]); 1412 mtx_unlock(&hio_recv_list_lock[ncomp]); 1413 goto done_queue; 1414 } 1415 rw_unlock(&hio_remote_lock[ncomp]); 1416 nv_free(nv); 1417 if (wakeup) 1418 cv_signal(&hio_recv_list_cond[ncomp]); 1419 continue; 1420 done_queue: 1421 nv_free(nv); 1422 if (ISSYNCREQ(hio)) { 1423 if (!refcount_release(&hio->hio_countdown)) 1424 continue; 1425 mtx_lock(&sync_lock); 1426 SYNCREQDONE(hio); 1427 mtx_unlock(&sync_lock); 1428 cv_signal(&sync_cond); 1429 continue; 1430 } 1431 if (ggio->gctl_cmd == BIO_WRITE) { 1432 mtx_lock(&res->hr_amp_lock); 1433 if (activemap_need_sync(res->hr_amp, ggio->gctl_offset, 1434 ggio->gctl_length)) { 1435 (void)hast_activemap_flush(res); 1436 } 1437 mtx_unlock(&res->hr_amp_lock); 1438 } 1439 if (!refcount_release(&hio->hio_countdown)) 1440 continue; 1441 pjdlog_debug(2, 1442 "remote_send: (%p) Moving request to the done queue.", 1443 hio); 1444 QUEUE_INSERT2(hio, done); 1445 } 1446 /* NOTREACHED */ 1447 return (NULL); 1448 } 1449 1450 /* 1451 * Thread receives answer from secondary node and passes it to ggate_send 1452 * thread. 1453 */ 1454 static void * 1455 remote_recv_thread(void *arg) 1456 { 1457 struct hast_resource *res = arg; 1458 struct g_gate_ctl_io *ggio; 1459 struct hio *hio; 1460 struct nv *nv; 1461 unsigned int ncomp; 1462 uint64_t seq; 1463 int error; 1464 1465 /* Remote component is 1 for now. */ 1466 ncomp = 1; 1467 1468 for (;;) { 1469 /* Wait until there is anything to receive. */ 1470 mtx_lock(&hio_recv_list_lock[ncomp]); 1471 while (TAILQ_EMPTY(&hio_recv_list[ncomp])) { 1472 pjdlog_debug(2, "remote_recv: No requests, waiting."); 1473 cv_wait(&hio_recv_list_cond[ncomp], 1474 &hio_recv_list_lock[ncomp]); 1475 } 1476 mtx_unlock(&hio_recv_list_lock[ncomp]); 1477 rw_rlock(&hio_remote_lock[ncomp]); 1478 if (!ISCONNECTED(res, ncomp)) { 1479 rw_unlock(&hio_remote_lock[ncomp]); 1480 /* 1481 * Connection is dead, so move all pending requests to 1482 * the done queue (one-by-one). 1483 */ 1484 mtx_lock(&hio_recv_list_lock[ncomp]); 1485 hio = TAILQ_FIRST(&hio_recv_list[ncomp]); 1486 PJDLOG_ASSERT(hio != NULL); 1487 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1488 hio_next[ncomp]); 1489 mtx_unlock(&hio_recv_list_lock[ncomp]); 1490 goto done_queue; 1491 } 1492 if (hast_proto_recv_hdr(res->hr_remotein, &nv) < 0) { 1493 pjdlog_errno(LOG_ERR, 1494 "Unable to receive reply header"); 1495 rw_unlock(&hio_remote_lock[ncomp]); 1496 remote_close(res, ncomp); 1497 continue; 1498 } 1499 rw_unlock(&hio_remote_lock[ncomp]); 1500 seq = nv_get_uint64(nv, "seq"); 1501 if (seq == 0) { 1502 pjdlog_error("Header contains no 'seq' field."); 1503 nv_free(nv); 1504 continue; 1505 } 1506 mtx_lock(&hio_recv_list_lock[ncomp]); 1507 TAILQ_FOREACH(hio, &hio_recv_list[ncomp], hio_next[ncomp]) { 1508 if (hio->hio_ggio.gctl_seq == seq) { 1509 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1510 hio_next[ncomp]); 1511 break; 1512 } 1513 } 1514 mtx_unlock(&hio_recv_list_lock[ncomp]); 1515 if (hio == NULL) { 1516 pjdlog_error("Found no request matching received 'seq' field (%ju).", 1517 (uintmax_t)seq); 1518 nv_free(nv); 1519 continue; 1520 } 1521 error = nv_get_int16(nv, "error"); 1522 if (error != 0) { 1523 /* Request failed on remote side. */ 1524 hio->hio_errors[ncomp] = error; 1525 reqlog(LOG_WARNING, 0, &hio->hio_ggio, 1526 "Remote request failed (%s): ", strerror(error)); 1527 nv_free(nv); 1528 goto done_queue; 1529 } 1530 ggio = &hio->hio_ggio; 1531 switch (ggio->gctl_cmd) { 1532 case BIO_READ: 1533 rw_rlock(&hio_remote_lock[ncomp]); 1534 if (!ISCONNECTED(res, ncomp)) { 1535 rw_unlock(&hio_remote_lock[ncomp]); 1536 nv_free(nv); 1537 goto done_queue; 1538 } 1539 if (hast_proto_recv_data(res, res->hr_remotein, nv, 1540 ggio->gctl_data, ggio->gctl_length) < 0) { 1541 hio->hio_errors[ncomp] = errno; 1542 pjdlog_errno(LOG_ERR, 1543 "Unable to receive reply data"); 1544 rw_unlock(&hio_remote_lock[ncomp]); 1545 nv_free(nv); 1546 remote_close(res, ncomp); 1547 goto done_queue; 1548 } 1549 rw_unlock(&hio_remote_lock[ncomp]); 1550 break; 1551 case BIO_WRITE: 1552 case BIO_DELETE: 1553 case BIO_FLUSH: 1554 break; 1555 default: 1556 PJDLOG_ASSERT(!"invalid condition"); 1557 abort(); 1558 } 1559 hio->hio_errors[ncomp] = 0; 1560 nv_free(nv); 1561 done_queue: 1562 if (refcount_release(&hio->hio_countdown)) { 1563 if (ISSYNCREQ(hio)) { 1564 mtx_lock(&sync_lock); 1565 SYNCREQDONE(hio); 1566 mtx_unlock(&sync_lock); 1567 cv_signal(&sync_cond); 1568 } else { 1569 pjdlog_debug(2, 1570 "remote_recv: (%p) Moving request to the done queue.", 1571 hio); 1572 QUEUE_INSERT2(hio, done); 1573 } 1574 } 1575 } 1576 /* NOTREACHED */ 1577 return (NULL); 1578 } 1579 1580 /* 1581 * Thread sends answer to the kernel. 1582 */ 1583 static void * 1584 ggate_send_thread(void *arg) 1585 { 1586 struct hast_resource *res = arg; 1587 struct g_gate_ctl_io *ggio; 1588 struct hio *hio; 1589 unsigned int ii, ncomp, ncomps; 1590 1591 ncomps = HAST_NCOMPONENTS; 1592 1593 for (;;) { 1594 pjdlog_debug(2, "ggate_send: Taking request."); 1595 QUEUE_TAKE2(hio, done); 1596 pjdlog_debug(2, "ggate_send: (%p) Got request.", hio); 1597 ggio = &hio->hio_ggio; 1598 for (ii = 0; ii < ncomps; ii++) { 1599 if (hio->hio_errors[ii] == 0) { 1600 /* 1601 * One successful request is enough to declare 1602 * success. 1603 */ 1604 ggio->gctl_error = 0; 1605 break; 1606 } 1607 } 1608 if (ii == ncomps) { 1609 /* 1610 * None of the requests were successful. 1611 * Use first error. 1612 */ 1613 ggio->gctl_error = hio->hio_errors[0]; 1614 } 1615 if (ggio->gctl_error == 0 && ggio->gctl_cmd == BIO_WRITE) { 1616 mtx_lock(&res->hr_amp_lock); 1617 activemap_write_complete(res->hr_amp, 1618 ggio->gctl_offset, ggio->gctl_length); 1619 mtx_unlock(&res->hr_amp_lock); 1620 } 1621 if (ggio->gctl_cmd == BIO_WRITE) { 1622 /* 1623 * Unlock range we locked. 1624 */ 1625 mtx_lock(&range_lock); 1626 rangelock_del(range_regular, ggio->gctl_offset, 1627 ggio->gctl_length); 1628 if (range_sync_wait) 1629 cv_signal(&range_sync_cond); 1630 mtx_unlock(&range_lock); 1631 /* 1632 * Bump local count if this is first write after 1633 * connection failure with remote node. 1634 */ 1635 ncomp = 1; 1636 rw_rlock(&hio_remote_lock[ncomp]); 1637 if (!ISCONNECTED(res, ncomp)) { 1638 mtx_lock(&metadata_lock); 1639 if (res->hr_primary_localcnt == 1640 res->hr_secondary_remotecnt) { 1641 res->hr_primary_localcnt++; 1642 pjdlog_debug(1, 1643 "Increasing localcnt to %ju.", 1644 (uintmax_t)res->hr_primary_localcnt); 1645 (void)metadata_write(res); 1646 } 1647 mtx_unlock(&metadata_lock); 1648 } 1649 rw_unlock(&hio_remote_lock[ncomp]); 1650 } 1651 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DONE, ggio) < 0) 1652 primary_exit(EX_OSERR, "G_GATE_CMD_DONE failed"); 1653 pjdlog_debug(2, 1654 "ggate_send: (%p) Moving request to the free queue.", hio); 1655 QUEUE_INSERT2(hio, free); 1656 } 1657 /* NOTREACHED */ 1658 return (NULL); 1659 } 1660 1661 /* 1662 * Thread synchronize local and remote components. 1663 */ 1664 static void * 1665 sync_thread(void *arg __unused) 1666 { 1667 struct hast_resource *res = arg; 1668 struct hio *hio; 1669 struct g_gate_ctl_io *ggio; 1670 unsigned int ii, ncomp, ncomps; 1671 off_t offset, length, synced; 1672 bool dorewind; 1673 int syncext; 1674 1675 ncomps = HAST_NCOMPONENTS; 1676 dorewind = true; 1677 synced = 0; 1678 offset = -1; 1679 1680 for (;;) { 1681 mtx_lock(&sync_lock); 1682 if (offset >= 0 && !sync_inprogress) { 1683 pjdlog_info("Synchronization interrupted. " 1684 "%jd bytes synchronized so far.", 1685 (intmax_t)synced); 1686 event_send(res, EVENT_SYNCINTR); 1687 } 1688 while (!sync_inprogress) { 1689 dorewind = true; 1690 synced = 0; 1691 cv_wait(&sync_cond, &sync_lock); 1692 } 1693 mtx_unlock(&sync_lock); 1694 /* 1695 * Obtain offset at which we should synchronize. 1696 * Rewind synchronization if needed. 1697 */ 1698 mtx_lock(&res->hr_amp_lock); 1699 if (dorewind) 1700 activemap_sync_rewind(res->hr_amp); 1701 offset = activemap_sync_offset(res->hr_amp, &length, &syncext); 1702 if (syncext != -1) { 1703 /* 1704 * We synchronized entire syncext extent, we can mark 1705 * it as clean now. 1706 */ 1707 if (activemap_extent_complete(res->hr_amp, syncext)) 1708 (void)hast_activemap_flush(res); 1709 } 1710 mtx_unlock(&res->hr_amp_lock); 1711 if (dorewind) { 1712 dorewind = false; 1713 if (offset < 0) 1714 pjdlog_info("Nodes are in sync."); 1715 else { 1716 pjdlog_info("Synchronization started. %ju bytes to go.", 1717 (uintmax_t)(res->hr_extentsize * 1718 activemap_ndirty(res->hr_amp))); 1719 event_send(res, EVENT_SYNCSTART); 1720 } 1721 } 1722 if (offset < 0) { 1723 sync_stop(); 1724 pjdlog_debug(1, "Nothing to synchronize."); 1725 /* 1726 * Synchronization complete, make both localcnt and 1727 * remotecnt equal. 1728 */ 1729 ncomp = 1; 1730 rw_rlock(&hio_remote_lock[ncomp]); 1731 if (ISCONNECTED(res, ncomp)) { 1732 if (synced > 0) { 1733 pjdlog_info("Synchronization complete. " 1734 "%jd bytes synchronized.", 1735 (intmax_t)synced); 1736 event_send(res, EVENT_SYNCDONE); 1737 } 1738 mtx_lock(&metadata_lock); 1739 res->hr_syncsrc = HAST_SYNCSRC_UNDEF; 1740 res->hr_primary_localcnt = 1741 res->hr_secondary_localcnt; 1742 res->hr_primary_remotecnt = 1743 res->hr_secondary_remotecnt; 1744 pjdlog_debug(1, 1745 "Setting localcnt to %ju and remotecnt to %ju.", 1746 (uintmax_t)res->hr_primary_localcnt, 1747 (uintmax_t)res->hr_secondary_localcnt); 1748 (void)metadata_write(res); 1749 mtx_unlock(&metadata_lock); 1750 } 1751 rw_unlock(&hio_remote_lock[ncomp]); 1752 continue; 1753 } 1754 pjdlog_debug(2, "sync: Taking free request."); 1755 QUEUE_TAKE2(hio, free); 1756 pjdlog_debug(2, "sync: (%p) Got free request.", hio); 1757 /* 1758 * Lock the range we are going to synchronize. We don't want 1759 * race where someone writes between our read and write. 1760 */ 1761 for (;;) { 1762 mtx_lock(&range_lock); 1763 if (rangelock_islocked(range_regular, offset, length)) { 1764 pjdlog_debug(2, 1765 "sync: Range offset=%jd length=%jd locked.", 1766 (intmax_t)offset, (intmax_t)length); 1767 range_sync_wait = true; 1768 cv_wait(&range_sync_cond, &range_lock); 1769 range_sync_wait = false; 1770 mtx_unlock(&range_lock); 1771 continue; 1772 } 1773 if (rangelock_add(range_sync, offset, length) < 0) { 1774 mtx_unlock(&range_lock); 1775 pjdlog_debug(2, 1776 "sync: Range offset=%jd length=%jd is already locked, waiting.", 1777 (intmax_t)offset, (intmax_t)length); 1778 sleep(1); 1779 continue; 1780 } 1781 mtx_unlock(&range_lock); 1782 break; 1783 } 1784 /* 1785 * First read the data from synchronization source. 1786 */ 1787 SYNCREQ(hio); 1788 ggio = &hio->hio_ggio; 1789 ggio->gctl_cmd = BIO_READ; 1790 ggio->gctl_offset = offset; 1791 ggio->gctl_length = length; 1792 ggio->gctl_error = 0; 1793 for (ii = 0; ii < ncomps; ii++) 1794 hio->hio_errors[ii] = EINVAL; 1795 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 1796 hio); 1797 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 1798 hio); 1799 mtx_lock(&metadata_lock); 1800 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1801 /* 1802 * This range is up-to-date on local component, 1803 * so handle request locally. 1804 */ 1805 /* Local component is 0 for now. */ 1806 ncomp = 0; 1807 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 1808 PJDLOG_ASSERT(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 1809 /* 1810 * This range is out-of-date on local component, 1811 * so send request to the remote node. 1812 */ 1813 /* Remote component is 1 for now. */ 1814 ncomp = 1; 1815 } 1816 mtx_unlock(&metadata_lock); 1817 refcount_init(&hio->hio_countdown, 1); 1818 QUEUE_INSERT1(hio, send, ncomp); 1819 1820 /* 1821 * Let's wait for READ to finish. 1822 */ 1823 mtx_lock(&sync_lock); 1824 while (!ISSYNCREQDONE(hio)) 1825 cv_wait(&sync_cond, &sync_lock); 1826 mtx_unlock(&sync_lock); 1827 1828 if (hio->hio_errors[ncomp] != 0) { 1829 pjdlog_error("Unable to read synchronization data: %s.", 1830 strerror(hio->hio_errors[ncomp])); 1831 goto free_queue; 1832 } 1833 1834 /* 1835 * We read the data from synchronization source, now write it 1836 * to synchronization target. 1837 */ 1838 SYNCREQ(hio); 1839 ggio->gctl_cmd = BIO_WRITE; 1840 for (ii = 0; ii < ncomps; ii++) 1841 hio->hio_errors[ii] = EINVAL; 1842 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 1843 hio); 1844 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 1845 hio); 1846 mtx_lock(&metadata_lock); 1847 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1848 /* 1849 * This range is up-to-date on local component, 1850 * so we update remote component. 1851 */ 1852 /* Remote component is 1 for now. */ 1853 ncomp = 1; 1854 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 1855 PJDLOG_ASSERT(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 1856 /* 1857 * This range is out-of-date on local component, 1858 * so we update it. 1859 */ 1860 /* Local component is 0 for now. */ 1861 ncomp = 0; 1862 } 1863 mtx_unlock(&metadata_lock); 1864 1865 pjdlog_debug(2, "sync: (%p) Moving request to the send queues.", 1866 hio); 1867 refcount_init(&hio->hio_countdown, 1); 1868 QUEUE_INSERT1(hio, send, ncomp); 1869 1870 /* 1871 * Let's wait for WRITE to finish. 1872 */ 1873 mtx_lock(&sync_lock); 1874 while (!ISSYNCREQDONE(hio)) 1875 cv_wait(&sync_cond, &sync_lock); 1876 mtx_unlock(&sync_lock); 1877 1878 if (hio->hio_errors[ncomp] != 0) { 1879 pjdlog_error("Unable to write synchronization data: %s.", 1880 strerror(hio->hio_errors[ncomp])); 1881 goto free_queue; 1882 } 1883 1884 synced += length; 1885 free_queue: 1886 mtx_lock(&range_lock); 1887 rangelock_del(range_sync, offset, length); 1888 if (range_regular_wait) 1889 cv_signal(&range_regular_cond); 1890 mtx_unlock(&range_lock); 1891 pjdlog_debug(2, "sync: (%p) Moving request to the free queue.", 1892 hio); 1893 QUEUE_INSERT2(hio, free); 1894 } 1895 /* NOTREACHED */ 1896 return (NULL); 1897 } 1898 1899 void 1900 primary_config_reload(struct hast_resource *res, struct nv *nv) 1901 { 1902 unsigned int ii, ncomps; 1903 int modified, vint; 1904 const char *vstr; 1905 1906 pjdlog_info("Reloading configuration..."); 1907 1908 PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY); 1909 PJDLOG_ASSERT(gres == res); 1910 nv_assert(nv, "remoteaddr"); 1911 nv_assert(nv, "replication"); 1912 nv_assert(nv, "timeout"); 1913 nv_assert(nv, "exec"); 1914 1915 ncomps = HAST_NCOMPONENTS; 1916 1917 #define MODIFIED_REMOTEADDR 0x1 1918 #define MODIFIED_REPLICATION 0x2 1919 #define MODIFIED_TIMEOUT 0x4 1920 #define MODIFIED_EXEC 0x8 1921 modified = 0; 1922 1923 vstr = nv_get_string(nv, "remoteaddr"); 1924 if (strcmp(gres->hr_remoteaddr, vstr) != 0) { 1925 /* 1926 * Don't copy res->hr_remoteaddr to gres just yet. 1927 * We want remote_close() to log disconnect from the old 1928 * addresses, not from the new ones. 1929 */ 1930 modified |= MODIFIED_REMOTEADDR; 1931 } 1932 vint = nv_get_int32(nv, "replication"); 1933 if (gres->hr_replication != vint) { 1934 gres->hr_replication = vint; 1935 modified |= MODIFIED_REPLICATION; 1936 } 1937 vint = nv_get_int32(nv, "timeout"); 1938 if (gres->hr_timeout != vint) { 1939 gres->hr_timeout = vint; 1940 modified |= MODIFIED_TIMEOUT; 1941 } 1942 vstr = nv_get_string(nv, "exec"); 1943 if (strcmp(gres->hr_exec, vstr) != 0) { 1944 strlcpy(gres->hr_exec, vstr, sizeof(gres->hr_exec)); 1945 modified |= MODIFIED_EXEC; 1946 } 1947 1948 /* 1949 * If only timeout was modified we only need to change it without 1950 * reconnecting. 1951 */ 1952 if (modified == MODIFIED_TIMEOUT) { 1953 for (ii = 0; ii < ncomps; ii++) { 1954 if (!ISREMOTE(ii)) 1955 continue; 1956 rw_rlock(&hio_remote_lock[ii]); 1957 if (!ISCONNECTED(gres, ii)) { 1958 rw_unlock(&hio_remote_lock[ii]); 1959 continue; 1960 } 1961 rw_unlock(&hio_remote_lock[ii]); 1962 if (proto_timeout(gres->hr_remotein, 1963 gres->hr_timeout) < 0) { 1964 pjdlog_errno(LOG_WARNING, 1965 "Unable to set connection timeout"); 1966 } 1967 if (proto_timeout(gres->hr_remoteout, 1968 gres->hr_timeout) < 0) { 1969 pjdlog_errno(LOG_WARNING, 1970 "Unable to set connection timeout"); 1971 } 1972 } 1973 } else if ((modified & 1974 (MODIFIED_REMOTEADDR | MODIFIED_REPLICATION)) != 0) { 1975 for (ii = 0; ii < ncomps; ii++) { 1976 if (!ISREMOTE(ii)) 1977 continue; 1978 remote_close(gres, ii); 1979 } 1980 if (modified & MODIFIED_REMOTEADDR) { 1981 vstr = nv_get_string(nv, "remoteaddr"); 1982 strlcpy(gres->hr_remoteaddr, vstr, 1983 sizeof(gres->hr_remoteaddr)); 1984 } 1985 } 1986 #undef MODIFIED_REMOTEADDR 1987 #undef MODIFIED_REPLICATION 1988 #undef MODIFIED_TIMEOUT 1989 #undef MODIFIED_EXEC 1990 1991 pjdlog_info("Configuration reloaded successfully."); 1992 } 1993 1994 static void 1995 guard_one(struct hast_resource *res, unsigned int ncomp) 1996 { 1997 struct proto_conn *in, *out; 1998 1999 if (!ISREMOTE(ncomp)) 2000 return; 2001 2002 rw_rlock(&hio_remote_lock[ncomp]); 2003 2004 if (!real_remote(res)) { 2005 rw_unlock(&hio_remote_lock[ncomp]); 2006 return; 2007 } 2008 2009 if (ISCONNECTED(res, ncomp)) { 2010 PJDLOG_ASSERT(res->hr_remotein != NULL); 2011 PJDLOG_ASSERT(res->hr_remoteout != NULL); 2012 rw_unlock(&hio_remote_lock[ncomp]); 2013 pjdlog_debug(2, "remote_guard: Connection to %s is ok.", 2014 res->hr_remoteaddr); 2015 return; 2016 } 2017 2018 PJDLOG_ASSERT(res->hr_remotein == NULL); 2019 PJDLOG_ASSERT(res->hr_remoteout == NULL); 2020 /* 2021 * Upgrade the lock. It doesn't have to be atomic as no other thread 2022 * can change connection status from disconnected to connected. 2023 */ 2024 rw_unlock(&hio_remote_lock[ncomp]); 2025 pjdlog_debug(2, "remote_guard: Reconnecting to %s.", 2026 res->hr_remoteaddr); 2027 in = out = NULL; 2028 if (init_remote(res, &in, &out)) { 2029 rw_wlock(&hio_remote_lock[ncomp]); 2030 PJDLOG_ASSERT(res->hr_remotein == NULL); 2031 PJDLOG_ASSERT(res->hr_remoteout == NULL); 2032 PJDLOG_ASSERT(in != NULL && out != NULL); 2033 res->hr_remotein = in; 2034 res->hr_remoteout = out; 2035 rw_unlock(&hio_remote_lock[ncomp]); 2036 pjdlog_info("Successfully reconnected to %s.", 2037 res->hr_remoteaddr); 2038 sync_start(); 2039 } else { 2040 /* Both connections should be NULL. */ 2041 PJDLOG_ASSERT(res->hr_remotein == NULL); 2042 PJDLOG_ASSERT(res->hr_remoteout == NULL); 2043 PJDLOG_ASSERT(in == NULL && out == NULL); 2044 pjdlog_debug(2, "remote_guard: Reconnect to %s failed.", 2045 res->hr_remoteaddr); 2046 } 2047 } 2048 2049 /* 2050 * Thread guards remote connections and reconnects when needed, handles 2051 * signals, etc. 2052 */ 2053 static void * 2054 guard_thread(void *arg) 2055 { 2056 struct hast_resource *res = arg; 2057 unsigned int ii, ncomps; 2058 struct timespec timeout; 2059 time_t lastcheck, now; 2060 sigset_t mask; 2061 int signo; 2062 2063 ncomps = HAST_NCOMPONENTS; 2064 lastcheck = time(NULL); 2065 2066 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 2067 PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0); 2068 PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0); 2069 2070 timeout.tv_sec = RETRY_SLEEP; 2071 timeout.tv_nsec = 0; 2072 signo = -1; 2073 2074 for (;;) { 2075 switch (signo) { 2076 case SIGINT: 2077 case SIGTERM: 2078 sigexit_received = true; 2079 primary_exitx(EX_OK, 2080 "Termination signal received, exiting."); 2081 break; 2082 default: 2083 break; 2084 } 2085 2086 pjdlog_debug(2, "remote_guard: Checking connections."); 2087 now = time(NULL); 2088 if (lastcheck + RETRY_SLEEP <= now) { 2089 for (ii = 0; ii < ncomps; ii++) 2090 guard_one(res, ii); 2091 lastcheck = now; 2092 } 2093 signo = sigtimedwait(&mask, NULL, &timeout); 2094 } 2095 /* NOTREACHED */ 2096 return (NULL); 2097 } 2098