1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2009 The FreeBSD Foundation 5 * Copyright (c) 2010-2011 Pawel Jakub Dawidek <pawel@dawidek.net> 6 * All rights reserved. 7 * 8 * This software was developed by Pawel Jakub Dawidek under sponsorship from 9 * the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/types.h> 34 #include <sys/time.h> 35 #include <sys/bio.h> 36 #include <sys/disk.h> 37 #include <sys/stat.h> 38 39 #include <geom/gate/g_gate.h> 40 41 #include <err.h> 42 #include <errno.h> 43 #include <fcntl.h> 44 #include <libgeom.h> 45 #include <pthread.h> 46 #include <signal.h> 47 #include <stdint.h> 48 #include <stdio.h> 49 #include <string.h> 50 #include <sysexits.h> 51 #include <unistd.h> 52 53 #include <activemap.h> 54 #include <nv.h> 55 #include <rangelock.h> 56 57 #include "control.h" 58 #include "event.h" 59 #include "hast.h" 60 #include "hast_proto.h" 61 #include "hastd.h" 62 #include "hooks.h" 63 #include "metadata.h" 64 #include "proto.h" 65 #include "pjdlog.h" 66 #include "refcnt.h" 67 #include "subr.h" 68 #include "synch.h" 69 70 /* The is only one remote component for now. */ 71 #define ISREMOTE(no) ((no) == 1) 72 73 struct hio { 74 /* 75 * Number of components we are still waiting for. 76 * When this field goes to 0, we can send the request back to the 77 * kernel. Each component has to decrease this counter by one 78 * even on failure. 79 */ 80 refcnt_t hio_countdown; 81 /* 82 * Each component has a place to store its own error. 83 * Once the request is handled by all components we can decide if the 84 * request overall is successful or not. 85 */ 86 int *hio_errors; 87 /* 88 * Structure used to communicate with GEOM Gate class. 89 */ 90 struct g_gate_ctl_io hio_ggio; 91 /* 92 * Request was already confirmed to GEOM Gate. 93 */ 94 bool hio_done; 95 /* 96 * Number of components we are still waiting before sending write 97 * completion ack to GEOM Gate. Used for memsync. 98 */ 99 refcnt_t hio_writecount; 100 /* 101 * Memsync request was acknowledged by remote. 102 */ 103 bool hio_memsyncacked; 104 /* 105 * Remember replication from the time the request was initiated, 106 * so we won't get confused when replication changes on reload. 107 */ 108 int hio_replication; 109 TAILQ_ENTRY(hio) *hio_next; 110 }; 111 #define hio_free_next hio_next[0] 112 #define hio_done_next hio_next[0] 113 114 /* 115 * Free list holds unused structures. When free list is empty, we have to wait 116 * until some in-progress requests are freed. 117 */ 118 static TAILQ_HEAD(, hio) hio_free_list; 119 static size_t hio_free_list_size; 120 static pthread_mutex_t hio_free_list_lock; 121 static pthread_cond_t hio_free_list_cond; 122 /* 123 * There is one send list for every component. One requests is placed on all 124 * send lists - each component gets the same request, but each component is 125 * responsible for managing his own send list. 126 */ 127 static TAILQ_HEAD(, hio) *hio_send_list; 128 static size_t *hio_send_list_size; 129 static pthread_mutex_t *hio_send_list_lock; 130 static pthread_cond_t *hio_send_list_cond; 131 #define hio_send_local_list_size hio_send_list_size[0] 132 #define hio_send_remote_list_size hio_send_list_size[1] 133 /* 134 * There is one recv list for every component, although local components don't 135 * use recv lists as local requests are done synchronously. 136 */ 137 static TAILQ_HEAD(, hio) *hio_recv_list; 138 static size_t *hio_recv_list_size; 139 static pthread_mutex_t *hio_recv_list_lock; 140 static pthread_cond_t *hio_recv_list_cond; 141 #define hio_recv_remote_list_size hio_recv_list_size[1] 142 /* 143 * Request is placed on done list by the slowest component (the one that 144 * decreased hio_countdown from 1 to 0). 145 */ 146 static TAILQ_HEAD(, hio) hio_done_list; 147 static size_t hio_done_list_size; 148 static pthread_mutex_t hio_done_list_lock; 149 static pthread_cond_t hio_done_list_cond; 150 /* 151 * Structure below are for interaction with sync thread. 152 */ 153 static bool sync_inprogress; 154 static pthread_mutex_t sync_lock; 155 static pthread_cond_t sync_cond; 156 /* 157 * The lock below allows to synchornize access to remote connections. 158 */ 159 static pthread_rwlock_t *hio_remote_lock; 160 161 /* 162 * Lock to synchronize metadata updates. Also synchronize access to 163 * hr_primary_localcnt and hr_primary_remotecnt fields. 164 */ 165 static pthread_mutex_t metadata_lock; 166 167 /* 168 * Maximum number of outstanding I/O requests. 169 */ 170 #define HAST_HIO_MAX 256 171 /* 172 * Number of components. At this point there are only two components: local 173 * and remote, but in the future it might be possible to use multiple local 174 * and remote components. 175 */ 176 #define HAST_NCOMPONENTS 2 177 178 #define ISCONNECTED(res, no) \ 179 ((res)->hr_remotein != NULL && (res)->hr_remoteout != NULL) 180 181 #define QUEUE_INSERT1(hio, name, ncomp) do { \ 182 mtx_lock(&hio_##name##_list_lock[(ncomp)]); \ 183 if (TAILQ_EMPTY(&hio_##name##_list[(ncomp)])) \ 184 cv_broadcast(&hio_##name##_list_cond[(ncomp)]); \ 185 TAILQ_INSERT_TAIL(&hio_##name##_list[(ncomp)], (hio), \ 186 hio_next[(ncomp)]); \ 187 hio_##name##_list_size[(ncomp)]++; \ 188 mtx_unlock(&hio_##name##_list_lock[(ncomp)]); \ 189 } while (0) 190 #define QUEUE_INSERT2(hio, name) do { \ 191 mtx_lock(&hio_##name##_list_lock); \ 192 if (TAILQ_EMPTY(&hio_##name##_list)) \ 193 cv_broadcast(&hio_##name##_list_cond); \ 194 TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_##name##_next);\ 195 hio_##name##_list_size++; \ 196 mtx_unlock(&hio_##name##_list_lock); \ 197 } while (0) 198 #define QUEUE_TAKE1(hio, name, ncomp, timeout) do { \ 199 bool _last; \ 200 \ 201 mtx_lock(&hio_##name##_list_lock[(ncomp)]); \ 202 _last = false; \ 203 while (((hio) = TAILQ_FIRST(&hio_##name##_list[(ncomp)])) == NULL && !_last) { \ 204 cv_timedwait(&hio_##name##_list_cond[(ncomp)], \ 205 &hio_##name##_list_lock[(ncomp)], (timeout)); \ 206 if ((timeout) != 0) \ 207 _last = true; \ 208 } \ 209 if (hio != NULL) { \ 210 PJDLOG_ASSERT(hio_##name##_list_size[(ncomp)] != 0); \ 211 hio_##name##_list_size[(ncomp)]--; \ 212 TAILQ_REMOVE(&hio_##name##_list[(ncomp)], (hio), \ 213 hio_next[(ncomp)]); \ 214 } \ 215 mtx_unlock(&hio_##name##_list_lock[(ncomp)]); \ 216 } while (0) 217 #define QUEUE_TAKE2(hio, name) do { \ 218 mtx_lock(&hio_##name##_list_lock); \ 219 while (((hio) = TAILQ_FIRST(&hio_##name##_list)) == NULL) { \ 220 cv_wait(&hio_##name##_list_cond, \ 221 &hio_##name##_list_lock); \ 222 } \ 223 PJDLOG_ASSERT(hio_##name##_list_size != 0); \ 224 hio_##name##_list_size--; \ 225 TAILQ_REMOVE(&hio_##name##_list, (hio), hio_##name##_next); \ 226 mtx_unlock(&hio_##name##_list_lock); \ 227 } while (0) 228 229 #define ISFULLSYNC(hio) ((hio)->hio_replication == HAST_REPLICATION_FULLSYNC) 230 #define ISMEMSYNC(hio) ((hio)->hio_replication == HAST_REPLICATION_MEMSYNC) 231 #define ISASYNC(hio) ((hio)->hio_replication == HAST_REPLICATION_ASYNC) 232 233 #define SYNCREQ(hio) do { \ 234 (hio)->hio_ggio.gctl_unit = -1; \ 235 (hio)->hio_ggio.gctl_seq = 1; \ 236 } while (0) 237 #define ISSYNCREQ(hio) ((hio)->hio_ggio.gctl_unit == -1) 238 #define SYNCREQDONE(hio) do { (hio)->hio_ggio.gctl_unit = -2; } while (0) 239 #define ISSYNCREQDONE(hio) ((hio)->hio_ggio.gctl_unit == -2) 240 241 #define ISMEMSYNCWRITE(hio) (ISMEMSYNC(hio) && \ 242 (hio)->hio_ggio.gctl_cmd == BIO_WRITE && !ISSYNCREQ(hio)) 243 244 static struct hast_resource *gres; 245 246 static pthread_mutex_t range_lock; 247 static struct rangelocks *range_regular; 248 static bool range_regular_wait; 249 static pthread_cond_t range_regular_cond; 250 static struct rangelocks *range_sync; 251 static bool range_sync_wait; 252 static pthread_cond_t range_sync_cond; 253 static bool fullystarted; 254 255 static void *ggate_recv_thread(void *arg); 256 static void *local_send_thread(void *arg); 257 static void *remote_send_thread(void *arg); 258 static void *remote_recv_thread(void *arg); 259 static void *ggate_send_thread(void *arg); 260 static void *sync_thread(void *arg); 261 static void *guard_thread(void *arg); 262 263 static void 264 output_status_aux(struct nv *nvout) 265 { 266 267 nv_add_uint64(nvout, (uint64_t)hio_free_list_size, 268 "idle_queue_size"); 269 nv_add_uint64(nvout, (uint64_t)hio_send_local_list_size, 270 "local_queue_size"); 271 nv_add_uint64(nvout, (uint64_t)hio_send_remote_list_size, 272 "send_queue_size"); 273 nv_add_uint64(nvout, (uint64_t)hio_recv_remote_list_size, 274 "recv_queue_size"); 275 nv_add_uint64(nvout, (uint64_t)hio_done_list_size, 276 "done_queue_size"); 277 } 278 279 static void 280 cleanup(struct hast_resource *res) 281 { 282 int rerrno; 283 284 /* Remember errno. */ 285 rerrno = errno; 286 287 /* Destroy ggate provider if we created one. */ 288 if (res->hr_ggateunit >= 0) { 289 struct g_gate_ctl_destroy ggiod; 290 291 bzero(&ggiod, sizeof(ggiod)); 292 ggiod.gctl_version = G_GATE_VERSION; 293 ggiod.gctl_unit = res->hr_ggateunit; 294 ggiod.gctl_force = 1; 295 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DESTROY, &ggiod) == -1) { 296 pjdlog_errno(LOG_WARNING, 297 "Unable to destroy hast/%s device", 298 res->hr_provname); 299 } 300 res->hr_ggateunit = -1; 301 } 302 303 /* Restore errno. */ 304 errno = rerrno; 305 } 306 307 static __dead2 void 308 primary_exit(int exitcode, const char *fmt, ...) 309 { 310 va_list ap; 311 312 PJDLOG_ASSERT(exitcode != EX_OK); 313 va_start(ap, fmt); 314 pjdlogv_errno(LOG_ERR, fmt, ap); 315 va_end(ap); 316 cleanup(gres); 317 exit(exitcode); 318 } 319 320 static __dead2 void 321 primary_exitx(int exitcode, const char *fmt, ...) 322 { 323 va_list ap; 324 325 va_start(ap, fmt); 326 pjdlogv(exitcode == EX_OK ? LOG_INFO : LOG_ERR, fmt, ap); 327 va_end(ap); 328 cleanup(gres); 329 exit(exitcode); 330 } 331 332 static int 333 hast_activemap_flush(struct hast_resource *res) __unlocks(res->hr_amp_lock) 334 { 335 const unsigned char *buf; 336 size_t size; 337 int ret; 338 339 mtx_lock(&res->hr_amp_diskmap_lock); 340 buf = activemap_bitmap(res->hr_amp, &size); 341 mtx_unlock(&res->hr_amp_lock); 342 PJDLOG_ASSERT(buf != NULL); 343 PJDLOG_ASSERT((size % res->hr_local_sectorsize) == 0); 344 ret = 0; 345 if (pwrite(res->hr_localfd, buf, size, METADATA_SIZE) != 346 (ssize_t)size) { 347 pjdlog_errno(LOG_ERR, "Unable to flush activemap to disk"); 348 res->hr_stat_activemap_write_error++; 349 ret = -1; 350 } 351 if (ret == 0 && res->hr_metaflush == 1 && 352 g_flush(res->hr_localfd) == -1) { 353 if (errno == EOPNOTSUPP) { 354 pjdlog_warning("The %s provider doesn't support flushing write cache. Disabling it.", 355 res->hr_localpath); 356 res->hr_metaflush = 0; 357 } else { 358 pjdlog_errno(LOG_ERR, 359 "Unable to flush disk cache on activemap update"); 360 res->hr_stat_activemap_flush_error++; 361 ret = -1; 362 } 363 } 364 mtx_unlock(&res->hr_amp_diskmap_lock); 365 return (ret); 366 } 367 368 static bool 369 real_remote(const struct hast_resource *res) 370 { 371 372 return (strcmp(res->hr_remoteaddr, "none") != 0); 373 } 374 375 static void 376 init_environment(struct hast_resource *res __unused) 377 { 378 struct hio *hio; 379 unsigned int ii, ncomps; 380 381 /* 382 * In the future it might be per-resource value. 383 */ 384 ncomps = HAST_NCOMPONENTS; 385 386 /* 387 * Allocate memory needed by lists. 388 */ 389 hio_send_list = malloc(sizeof(hio_send_list[0]) * ncomps); 390 if (hio_send_list == NULL) { 391 primary_exitx(EX_TEMPFAIL, 392 "Unable to allocate %zu bytes of memory for send lists.", 393 sizeof(hio_send_list[0]) * ncomps); 394 } 395 hio_send_list_size = malloc(sizeof(hio_send_list_size[0]) * ncomps); 396 if (hio_send_list_size == NULL) { 397 primary_exitx(EX_TEMPFAIL, 398 "Unable to allocate %zu bytes of memory for send list counters.", 399 sizeof(hio_send_list_size[0]) * ncomps); 400 } 401 hio_send_list_lock = malloc(sizeof(hio_send_list_lock[0]) * ncomps); 402 if (hio_send_list_lock == NULL) { 403 primary_exitx(EX_TEMPFAIL, 404 "Unable to allocate %zu bytes of memory for send list locks.", 405 sizeof(hio_send_list_lock[0]) * ncomps); 406 } 407 hio_send_list_cond = malloc(sizeof(hio_send_list_cond[0]) * ncomps); 408 if (hio_send_list_cond == NULL) { 409 primary_exitx(EX_TEMPFAIL, 410 "Unable to allocate %zu bytes of memory for send list condition variables.", 411 sizeof(hio_send_list_cond[0]) * ncomps); 412 } 413 hio_recv_list = malloc(sizeof(hio_recv_list[0]) * ncomps); 414 if (hio_recv_list == NULL) { 415 primary_exitx(EX_TEMPFAIL, 416 "Unable to allocate %zu bytes of memory for recv lists.", 417 sizeof(hio_recv_list[0]) * ncomps); 418 } 419 hio_recv_list_size = malloc(sizeof(hio_recv_list_size[0]) * ncomps); 420 if (hio_recv_list_size == NULL) { 421 primary_exitx(EX_TEMPFAIL, 422 "Unable to allocate %zu bytes of memory for recv list counters.", 423 sizeof(hio_recv_list_size[0]) * ncomps); 424 } 425 hio_recv_list_lock = malloc(sizeof(hio_recv_list_lock[0]) * ncomps); 426 if (hio_recv_list_lock == NULL) { 427 primary_exitx(EX_TEMPFAIL, 428 "Unable to allocate %zu bytes of memory for recv list locks.", 429 sizeof(hio_recv_list_lock[0]) * ncomps); 430 } 431 hio_recv_list_cond = malloc(sizeof(hio_recv_list_cond[0]) * ncomps); 432 if (hio_recv_list_cond == NULL) { 433 primary_exitx(EX_TEMPFAIL, 434 "Unable to allocate %zu bytes of memory for recv list condition variables.", 435 sizeof(hio_recv_list_cond[0]) * ncomps); 436 } 437 hio_remote_lock = malloc(sizeof(hio_remote_lock[0]) * ncomps); 438 if (hio_remote_lock == NULL) { 439 primary_exitx(EX_TEMPFAIL, 440 "Unable to allocate %zu bytes of memory for remote connections locks.", 441 sizeof(hio_remote_lock[0]) * ncomps); 442 } 443 444 /* 445 * Initialize lists, their counters, locks and condition variables. 446 */ 447 TAILQ_INIT(&hio_free_list); 448 mtx_init(&hio_free_list_lock); 449 cv_init(&hio_free_list_cond); 450 for (ii = 0; ii < HAST_NCOMPONENTS; ii++) { 451 TAILQ_INIT(&hio_send_list[ii]); 452 hio_send_list_size[ii] = 0; 453 mtx_init(&hio_send_list_lock[ii]); 454 cv_init(&hio_send_list_cond[ii]); 455 TAILQ_INIT(&hio_recv_list[ii]); 456 hio_recv_list_size[ii] = 0; 457 mtx_init(&hio_recv_list_lock[ii]); 458 cv_init(&hio_recv_list_cond[ii]); 459 rw_init(&hio_remote_lock[ii]); 460 } 461 TAILQ_INIT(&hio_done_list); 462 mtx_init(&hio_done_list_lock); 463 cv_init(&hio_done_list_cond); 464 mtx_init(&metadata_lock); 465 466 /* 467 * Allocate requests pool and initialize requests. 468 */ 469 for (ii = 0; ii < HAST_HIO_MAX; ii++) { 470 hio = malloc(sizeof(*hio)); 471 if (hio == NULL) { 472 primary_exitx(EX_TEMPFAIL, 473 "Unable to allocate %zu bytes of memory for hio request.", 474 sizeof(*hio)); 475 } 476 refcnt_init(&hio->hio_countdown, 0); 477 hio->hio_errors = malloc(sizeof(hio->hio_errors[0]) * ncomps); 478 if (hio->hio_errors == NULL) { 479 primary_exitx(EX_TEMPFAIL, 480 "Unable allocate %zu bytes of memory for hio errors.", 481 sizeof(hio->hio_errors[0]) * ncomps); 482 } 483 hio->hio_next = malloc(sizeof(hio->hio_next[0]) * ncomps); 484 if (hio->hio_next == NULL) { 485 primary_exitx(EX_TEMPFAIL, 486 "Unable allocate %zu bytes of memory for hio_next field.", 487 sizeof(hio->hio_next[0]) * ncomps); 488 } 489 hio->hio_ggio.gctl_version = G_GATE_VERSION; 490 hio->hio_ggio.gctl_data = malloc(MAXPHYS); 491 if (hio->hio_ggio.gctl_data == NULL) { 492 primary_exitx(EX_TEMPFAIL, 493 "Unable to allocate %zu bytes of memory for gctl_data.", 494 MAXPHYS); 495 } 496 hio->hio_ggio.gctl_length = MAXPHYS; 497 hio->hio_ggio.gctl_error = 0; 498 TAILQ_INSERT_HEAD(&hio_free_list, hio, hio_free_next); 499 hio_free_list_size++; 500 } 501 } 502 503 static bool 504 init_resuid(struct hast_resource *res) 505 { 506 507 mtx_lock(&metadata_lock); 508 if (res->hr_resuid != 0) { 509 mtx_unlock(&metadata_lock); 510 return (false); 511 } else { 512 /* Initialize unique resource identifier. */ 513 arc4random_buf(&res->hr_resuid, sizeof(res->hr_resuid)); 514 mtx_unlock(&metadata_lock); 515 if (metadata_write(res) == -1) 516 exit(EX_NOINPUT); 517 return (true); 518 } 519 } 520 521 static void 522 init_local(struct hast_resource *res) 523 { 524 unsigned char *buf; 525 size_t mapsize; 526 527 if (metadata_read(res, true) == -1) 528 exit(EX_NOINPUT); 529 mtx_init(&res->hr_amp_lock); 530 if (activemap_init(&res->hr_amp, res->hr_datasize, res->hr_extentsize, 531 res->hr_local_sectorsize, res->hr_keepdirty) == -1) { 532 primary_exit(EX_TEMPFAIL, "Unable to create activemap"); 533 } 534 mtx_init(&range_lock); 535 cv_init(&range_regular_cond); 536 if (rangelock_init(&range_regular) == -1) 537 primary_exit(EX_TEMPFAIL, "Unable to create regular range lock"); 538 cv_init(&range_sync_cond); 539 if (rangelock_init(&range_sync) == -1) 540 primary_exit(EX_TEMPFAIL, "Unable to create sync range lock"); 541 mapsize = activemap_ondisk_size(res->hr_amp); 542 buf = calloc(1, mapsize); 543 if (buf == NULL) { 544 primary_exitx(EX_TEMPFAIL, 545 "Unable to allocate buffer for activemap."); 546 } 547 if (pread(res->hr_localfd, buf, mapsize, METADATA_SIZE) != 548 (ssize_t)mapsize) { 549 primary_exit(EX_NOINPUT, "Unable to read activemap"); 550 } 551 activemap_copyin(res->hr_amp, buf, mapsize); 552 free(buf); 553 if (res->hr_resuid != 0) 554 return; 555 /* 556 * We're using provider for the first time. Initialize local and remote 557 * counters. We don't initialize resuid here, as we want to do it just 558 * in time. The reason for this is that we want to inform secondary 559 * that there were no writes yet, so there is no need to synchronize 560 * anything. 561 */ 562 res->hr_primary_localcnt = 0; 563 res->hr_primary_remotecnt = 0; 564 if (metadata_write(res) == -1) 565 exit(EX_NOINPUT); 566 } 567 568 static int 569 primary_connect(struct hast_resource *res, struct proto_conn **connp) 570 { 571 struct proto_conn *conn; 572 int16_t val; 573 574 val = 1; 575 if (proto_send(res->hr_conn, &val, sizeof(val)) == -1) { 576 primary_exit(EX_TEMPFAIL, 577 "Unable to send connection request to parent"); 578 } 579 if (proto_recv(res->hr_conn, &val, sizeof(val)) == -1) { 580 primary_exit(EX_TEMPFAIL, 581 "Unable to receive reply to connection request from parent"); 582 } 583 if (val != 0) { 584 errno = val; 585 pjdlog_errno(LOG_WARNING, "Unable to connect to %s", 586 res->hr_remoteaddr); 587 return (-1); 588 } 589 if (proto_connection_recv(res->hr_conn, true, &conn) == -1) { 590 primary_exit(EX_TEMPFAIL, 591 "Unable to receive connection from parent"); 592 } 593 if (proto_connect_wait(conn, res->hr_timeout) == -1) { 594 pjdlog_errno(LOG_WARNING, "Unable to connect to %s", 595 res->hr_remoteaddr); 596 proto_close(conn); 597 return (-1); 598 } 599 /* Error in setting timeout is not critical, but why should it fail? */ 600 if (proto_timeout(conn, res->hr_timeout) == -1) 601 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 602 603 *connp = conn; 604 605 return (0); 606 } 607 608 /* 609 * Function instructs GEOM_GATE to handle reads directly from within the kernel. 610 */ 611 static void 612 enable_direct_reads(struct hast_resource *res) 613 { 614 struct g_gate_ctl_modify ggiomodify; 615 616 bzero(&ggiomodify, sizeof(ggiomodify)); 617 ggiomodify.gctl_version = G_GATE_VERSION; 618 ggiomodify.gctl_unit = res->hr_ggateunit; 619 ggiomodify.gctl_modify = GG_MODIFY_READPROV | GG_MODIFY_READOFFSET; 620 strlcpy(ggiomodify.gctl_readprov, res->hr_localpath, 621 sizeof(ggiomodify.gctl_readprov)); 622 ggiomodify.gctl_readoffset = res->hr_localoff; 623 if (ioctl(res->hr_ggatefd, G_GATE_CMD_MODIFY, &ggiomodify) == 0) 624 pjdlog_debug(1, "Direct reads enabled."); 625 else 626 pjdlog_errno(LOG_WARNING, "Failed to enable direct reads"); 627 } 628 629 static int 630 init_remote(struct hast_resource *res, struct proto_conn **inp, 631 struct proto_conn **outp) 632 { 633 struct proto_conn *in, *out; 634 struct nv *nvout, *nvin; 635 const unsigned char *token; 636 unsigned char *map; 637 const char *errmsg; 638 int32_t extentsize; 639 int64_t datasize; 640 uint32_t mapsize; 641 uint8_t version; 642 size_t size; 643 int error; 644 645 PJDLOG_ASSERT((inp == NULL && outp == NULL) || (inp != NULL && outp != NULL)); 646 PJDLOG_ASSERT(real_remote(res)); 647 648 in = out = NULL; 649 errmsg = NULL; 650 651 if (primary_connect(res, &out) == -1) 652 return (ECONNREFUSED); 653 654 error = ECONNABORTED; 655 656 /* 657 * First handshake step. 658 * Setup outgoing connection with remote node. 659 */ 660 nvout = nv_alloc(); 661 nv_add_string(nvout, res->hr_name, "resource"); 662 nv_add_uint8(nvout, HAST_PROTO_VERSION, "version"); 663 if (nv_error(nvout) != 0) { 664 pjdlog_common(LOG_WARNING, 0, nv_error(nvout), 665 "Unable to allocate header for connection with %s", 666 res->hr_remoteaddr); 667 nv_free(nvout); 668 goto close; 669 } 670 if (hast_proto_send(res, out, nvout, NULL, 0) == -1) { 671 pjdlog_errno(LOG_WARNING, 672 "Unable to send handshake header to %s", 673 res->hr_remoteaddr); 674 nv_free(nvout); 675 goto close; 676 } 677 nv_free(nvout); 678 if (hast_proto_recv_hdr(out, &nvin) == -1) { 679 pjdlog_errno(LOG_WARNING, 680 "Unable to receive handshake header from %s", 681 res->hr_remoteaddr); 682 goto close; 683 } 684 errmsg = nv_get_string(nvin, "errmsg"); 685 if (errmsg != NULL) { 686 pjdlog_warning("%s", errmsg); 687 if (nv_exists(nvin, "wait")) 688 error = EBUSY; 689 nv_free(nvin); 690 goto close; 691 } 692 version = nv_get_uint8(nvin, "version"); 693 if (version == 0) { 694 /* 695 * If no version is sent, it means this is protocol version 1. 696 */ 697 version = 1; 698 } 699 if (version > HAST_PROTO_VERSION) { 700 pjdlog_warning("Invalid version received (%hhu).", version); 701 nv_free(nvin); 702 goto close; 703 } 704 res->hr_version = version; 705 pjdlog_debug(1, "Negotiated protocol version %d.", res->hr_version); 706 token = nv_get_uint8_array(nvin, &size, "token"); 707 if (token == NULL) { 708 pjdlog_warning("Handshake header from %s has no 'token' field.", 709 res->hr_remoteaddr); 710 nv_free(nvin); 711 goto close; 712 } 713 if (size != sizeof(res->hr_token)) { 714 pjdlog_warning("Handshake header from %s contains 'token' of wrong size (got %zu, expected %zu).", 715 res->hr_remoteaddr, size, sizeof(res->hr_token)); 716 nv_free(nvin); 717 goto close; 718 } 719 bcopy(token, res->hr_token, sizeof(res->hr_token)); 720 nv_free(nvin); 721 722 /* 723 * Second handshake step. 724 * Setup incoming connection with remote node. 725 */ 726 if (primary_connect(res, &in) == -1) 727 goto close; 728 729 nvout = nv_alloc(); 730 nv_add_string(nvout, res->hr_name, "resource"); 731 nv_add_uint8_array(nvout, res->hr_token, sizeof(res->hr_token), 732 "token"); 733 if (res->hr_resuid == 0) { 734 /* 735 * The resuid field was not yet initialized. 736 * Because we do synchronization inside init_resuid(), it is 737 * possible that someone already initialized it, the function 738 * will return false then, but if we successfully initialized 739 * it, we will get true. True means that there were no writes 740 * to this resource yet and we want to inform secondary that 741 * synchronization is not needed by sending "virgin" argument. 742 */ 743 if (init_resuid(res)) 744 nv_add_int8(nvout, 1, "virgin"); 745 } 746 nv_add_uint64(nvout, res->hr_resuid, "resuid"); 747 nv_add_uint64(nvout, res->hr_primary_localcnt, "localcnt"); 748 nv_add_uint64(nvout, res->hr_primary_remotecnt, "remotecnt"); 749 if (nv_error(nvout) != 0) { 750 pjdlog_common(LOG_WARNING, 0, nv_error(nvout), 751 "Unable to allocate header for connection with %s", 752 res->hr_remoteaddr); 753 nv_free(nvout); 754 goto close; 755 } 756 if (hast_proto_send(res, in, nvout, NULL, 0) == -1) { 757 pjdlog_errno(LOG_WARNING, 758 "Unable to send handshake header to %s", 759 res->hr_remoteaddr); 760 nv_free(nvout); 761 goto close; 762 } 763 nv_free(nvout); 764 if (hast_proto_recv_hdr(out, &nvin) == -1) { 765 pjdlog_errno(LOG_WARNING, 766 "Unable to receive handshake header from %s", 767 res->hr_remoteaddr); 768 goto close; 769 } 770 errmsg = nv_get_string(nvin, "errmsg"); 771 if (errmsg != NULL) { 772 pjdlog_warning("%s", errmsg); 773 nv_free(nvin); 774 goto close; 775 } 776 datasize = nv_get_int64(nvin, "datasize"); 777 if (datasize != res->hr_datasize) { 778 pjdlog_warning("Data size differs between nodes (local=%jd, remote=%jd).", 779 (intmax_t)res->hr_datasize, (intmax_t)datasize); 780 nv_free(nvin); 781 goto close; 782 } 783 extentsize = nv_get_int32(nvin, "extentsize"); 784 if (extentsize != res->hr_extentsize) { 785 pjdlog_warning("Extent size differs between nodes (local=%zd, remote=%zd).", 786 (ssize_t)res->hr_extentsize, (ssize_t)extentsize); 787 nv_free(nvin); 788 goto close; 789 } 790 res->hr_secondary_localcnt = nv_get_uint64(nvin, "localcnt"); 791 res->hr_secondary_remotecnt = nv_get_uint64(nvin, "remotecnt"); 792 res->hr_syncsrc = nv_get_uint8(nvin, "syncsrc"); 793 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) 794 enable_direct_reads(res); 795 if (nv_exists(nvin, "virgin")) { 796 /* 797 * Secondary was reinitialized, bump localcnt if it is 0 as 798 * only we have the data. 799 */ 800 PJDLOG_ASSERT(res->hr_syncsrc == HAST_SYNCSRC_PRIMARY); 801 PJDLOG_ASSERT(res->hr_secondary_localcnt == 0); 802 803 if (res->hr_primary_localcnt == 0) { 804 PJDLOG_ASSERT(res->hr_secondary_remotecnt == 0); 805 806 mtx_lock(&metadata_lock); 807 res->hr_primary_localcnt++; 808 pjdlog_debug(1, "Increasing localcnt to %ju.", 809 (uintmax_t)res->hr_primary_localcnt); 810 (void)metadata_write(res); 811 mtx_unlock(&metadata_lock); 812 } 813 } 814 map = NULL; 815 mapsize = nv_get_uint32(nvin, "mapsize"); 816 if (mapsize > 0) { 817 map = malloc(mapsize); 818 if (map == NULL) { 819 pjdlog_error("Unable to allocate memory for remote activemap (mapsize=%ju).", 820 (uintmax_t)mapsize); 821 nv_free(nvin); 822 goto close; 823 } 824 /* 825 * Remote node have some dirty extents on its own, lets 826 * download its activemap. 827 */ 828 if (hast_proto_recv_data(res, out, nvin, map, 829 mapsize) == -1) { 830 pjdlog_errno(LOG_ERR, 831 "Unable to receive remote activemap"); 832 nv_free(nvin); 833 free(map); 834 goto close; 835 } 836 mtx_lock(&res->hr_amp_lock); 837 /* 838 * Merge local and remote bitmaps. 839 */ 840 activemap_merge(res->hr_amp, map, mapsize); 841 free(map); 842 /* 843 * Now that we merged bitmaps from both nodes, flush it to the 844 * disk before we start to synchronize. 845 */ 846 (void)hast_activemap_flush(res); 847 } 848 nv_free(nvin); 849 #ifdef notyet 850 /* Setup directions. */ 851 if (proto_send(out, NULL, 0) == -1) 852 pjdlog_errno(LOG_WARNING, "Unable to set connection direction"); 853 if (proto_recv(in, NULL, 0) == -1) 854 pjdlog_errno(LOG_WARNING, "Unable to set connection direction"); 855 #endif 856 pjdlog_info("Connected to %s.", res->hr_remoteaddr); 857 if (res->hr_original_replication == HAST_REPLICATION_MEMSYNC && 858 res->hr_version < 2) { 859 pjdlog_warning("The 'memsync' replication mode is not supported by the remote node, falling back to 'fullsync' mode."); 860 res->hr_replication = HAST_REPLICATION_FULLSYNC; 861 } else if (res->hr_replication != res->hr_original_replication) { 862 /* 863 * This is in case hastd disconnected and was upgraded. 864 */ 865 res->hr_replication = res->hr_original_replication; 866 } 867 if (inp != NULL && outp != NULL) { 868 *inp = in; 869 *outp = out; 870 } else { 871 res->hr_remotein = in; 872 res->hr_remoteout = out; 873 } 874 event_send(res, EVENT_CONNECT); 875 return (0); 876 close: 877 if (errmsg != NULL && strcmp(errmsg, "Split-brain condition!") == 0) 878 event_send(res, EVENT_SPLITBRAIN); 879 proto_close(out); 880 if (in != NULL) 881 proto_close(in); 882 return (error); 883 } 884 885 static void 886 sync_start(void) 887 { 888 889 mtx_lock(&sync_lock); 890 sync_inprogress = true; 891 mtx_unlock(&sync_lock); 892 cv_signal(&sync_cond); 893 } 894 895 static void 896 sync_stop(void) 897 { 898 899 mtx_lock(&sync_lock); 900 if (sync_inprogress) 901 sync_inprogress = false; 902 mtx_unlock(&sync_lock); 903 } 904 905 static void 906 init_ggate(struct hast_resource *res) 907 { 908 struct g_gate_ctl_create ggiocreate; 909 struct g_gate_ctl_cancel ggiocancel; 910 911 /* 912 * We communicate with ggate via /dev/ggctl. Open it. 913 */ 914 res->hr_ggatefd = open("/dev/" G_GATE_CTL_NAME, O_RDWR); 915 if (res->hr_ggatefd == -1) 916 primary_exit(EX_OSFILE, "Unable to open /dev/" G_GATE_CTL_NAME); 917 /* 918 * Create provider before trying to connect, as connection failure 919 * is not critical, but may take some time. 920 */ 921 bzero(&ggiocreate, sizeof(ggiocreate)); 922 ggiocreate.gctl_version = G_GATE_VERSION; 923 ggiocreate.gctl_mediasize = res->hr_datasize; 924 ggiocreate.gctl_sectorsize = res->hr_local_sectorsize; 925 ggiocreate.gctl_flags = 0; 926 ggiocreate.gctl_maxcount = 0; 927 ggiocreate.gctl_timeout = 0; 928 ggiocreate.gctl_unit = G_GATE_NAME_GIVEN; 929 snprintf(ggiocreate.gctl_name, sizeof(ggiocreate.gctl_name), "hast/%s", 930 res->hr_provname); 931 if (ioctl(res->hr_ggatefd, G_GATE_CMD_CREATE, &ggiocreate) == 0) { 932 pjdlog_info("Device hast/%s created.", res->hr_provname); 933 res->hr_ggateunit = ggiocreate.gctl_unit; 934 return; 935 } 936 if (errno != EEXIST) { 937 primary_exit(EX_OSERR, "Unable to create hast/%s device", 938 res->hr_provname); 939 } 940 pjdlog_debug(1, 941 "Device hast/%s already exists, we will try to take it over.", 942 res->hr_provname); 943 /* 944 * If we received EEXIST, we assume that the process who created the 945 * provider died and didn't clean up. In that case we will start from 946 * where he left of. 947 */ 948 bzero(&ggiocancel, sizeof(ggiocancel)); 949 ggiocancel.gctl_version = G_GATE_VERSION; 950 ggiocancel.gctl_unit = G_GATE_NAME_GIVEN; 951 snprintf(ggiocancel.gctl_name, sizeof(ggiocancel.gctl_name), "hast/%s", 952 res->hr_provname); 953 if (ioctl(res->hr_ggatefd, G_GATE_CMD_CANCEL, &ggiocancel) == 0) { 954 pjdlog_info("Device hast/%s recovered.", res->hr_provname); 955 res->hr_ggateunit = ggiocancel.gctl_unit; 956 return; 957 } 958 primary_exit(EX_OSERR, "Unable to take over hast/%s device", 959 res->hr_provname); 960 } 961 962 void 963 hastd_primary(struct hast_resource *res) 964 { 965 pthread_t td; 966 pid_t pid; 967 int error, mode, debuglevel; 968 969 /* 970 * Create communication channel for sending control commands from 971 * parent to child. 972 */ 973 if (proto_client(NULL, "socketpair://", &res->hr_ctrl) == -1) { 974 /* TODO: There's no need for this to be fatal error. */ 975 KEEP_ERRNO((void)pidfile_remove(pfh)); 976 pjdlog_exit(EX_OSERR, 977 "Unable to create control sockets between parent and child"); 978 } 979 /* 980 * Create communication channel for sending events from child to parent. 981 */ 982 if (proto_client(NULL, "socketpair://", &res->hr_event) == -1) { 983 /* TODO: There's no need for this to be fatal error. */ 984 KEEP_ERRNO((void)pidfile_remove(pfh)); 985 pjdlog_exit(EX_OSERR, 986 "Unable to create event sockets between child and parent"); 987 } 988 /* 989 * Create communication channel for sending connection requests from 990 * child to parent. 991 */ 992 if (proto_client(NULL, "socketpair://", &res->hr_conn) == -1) { 993 /* TODO: There's no need for this to be fatal error. */ 994 KEEP_ERRNO((void)pidfile_remove(pfh)); 995 pjdlog_exit(EX_OSERR, 996 "Unable to create connection sockets between child and parent"); 997 } 998 999 pid = fork(); 1000 if (pid == -1) { 1001 /* TODO: There's no need for this to be fatal error. */ 1002 KEEP_ERRNO((void)pidfile_remove(pfh)); 1003 pjdlog_exit(EX_TEMPFAIL, "Unable to fork"); 1004 } 1005 1006 if (pid > 0) { 1007 /* This is parent. */ 1008 /* Declare that we are receiver. */ 1009 proto_recv(res->hr_event, NULL, 0); 1010 proto_recv(res->hr_conn, NULL, 0); 1011 /* Declare that we are sender. */ 1012 proto_send(res->hr_ctrl, NULL, 0); 1013 res->hr_workerpid = pid; 1014 return; 1015 } 1016 1017 gres = res; 1018 res->output_status_aux = output_status_aux; 1019 mode = pjdlog_mode_get(); 1020 debuglevel = pjdlog_debug_get(); 1021 1022 /* Declare that we are sender. */ 1023 proto_send(res->hr_event, NULL, 0); 1024 proto_send(res->hr_conn, NULL, 0); 1025 /* Declare that we are receiver. */ 1026 proto_recv(res->hr_ctrl, NULL, 0); 1027 descriptors_cleanup(res); 1028 1029 descriptors_assert(res, mode); 1030 1031 pjdlog_init(mode); 1032 pjdlog_debug_set(debuglevel); 1033 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 1034 setproctitle("%s (%s)", res->hr_name, role2str(res->hr_role)); 1035 1036 init_local(res); 1037 init_ggate(res); 1038 init_environment(res); 1039 1040 if (drop_privs(res) != 0) { 1041 cleanup(res); 1042 exit(EX_CONFIG); 1043 } 1044 pjdlog_info("Privileges successfully dropped."); 1045 1046 /* 1047 * Create the guard thread first, so we can handle signals from the 1048 * very beginning. 1049 */ 1050 error = pthread_create(&td, NULL, guard_thread, res); 1051 PJDLOG_ASSERT(error == 0); 1052 /* 1053 * Create the control thread before sending any event to the parent, 1054 * as we can deadlock when parent sends control request to worker, 1055 * but worker has no control thread started yet, so parent waits. 1056 * In the meantime worker sends an event to the parent, but parent 1057 * is unable to handle the event, because it waits for control 1058 * request response. 1059 */ 1060 error = pthread_create(&td, NULL, ctrl_thread, res); 1061 PJDLOG_ASSERT(error == 0); 1062 if (real_remote(res)) { 1063 error = init_remote(res, NULL, NULL); 1064 if (error == 0) { 1065 sync_start(); 1066 } else if (error == EBUSY) { 1067 time_t start = time(NULL); 1068 1069 pjdlog_warning("Waiting for remote node to become %s for %ds.", 1070 role2str(HAST_ROLE_SECONDARY), 1071 res->hr_timeout); 1072 for (;;) { 1073 sleep(1); 1074 error = init_remote(res, NULL, NULL); 1075 if (error != EBUSY) 1076 break; 1077 if (time(NULL) > start + res->hr_timeout) 1078 break; 1079 } 1080 if (error == EBUSY) { 1081 pjdlog_warning("Remote node is still %s, starting anyway.", 1082 role2str(HAST_ROLE_PRIMARY)); 1083 } 1084 } 1085 } 1086 error = pthread_create(&td, NULL, ggate_recv_thread, res); 1087 PJDLOG_ASSERT(error == 0); 1088 error = pthread_create(&td, NULL, local_send_thread, res); 1089 PJDLOG_ASSERT(error == 0); 1090 error = pthread_create(&td, NULL, remote_send_thread, res); 1091 PJDLOG_ASSERT(error == 0); 1092 error = pthread_create(&td, NULL, remote_recv_thread, res); 1093 PJDLOG_ASSERT(error == 0); 1094 error = pthread_create(&td, NULL, ggate_send_thread, res); 1095 PJDLOG_ASSERT(error == 0); 1096 fullystarted = true; 1097 (void)sync_thread(res); 1098 } 1099 1100 static void 1101 reqlog(int loglevel, int debuglevel, struct g_gate_ctl_io *ggio, 1102 const char *fmt, ...) 1103 { 1104 char msg[1024]; 1105 va_list ap; 1106 1107 va_start(ap, fmt); 1108 (void)vsnprintf(msg, sizeof(msg), fmt, ap); 1109 va_end(ap); 1110 switch (ggio->gctl_cmd) { 1111 case BIO_READ: 1112 (void)snprlcat(msg, sizeof(msg), "READ(%ju, %ju).", 1113 (uintmax_t)ggio->gctl_offset, (uintmax_t)ggio->gctl_length); 1114 break; 1115 case BIO_DELETE: 1116 (void)snprlcat(msg, sizeof(msg), "DELETE(%ju, %ju).", 1117 (uintmax_t)ggio->gctl_offset, (uintmax_t)ggio->gctl_length); 1118 break; 1119 case BIO_FLUSH: 1120 (void)snprlcat(msg, sizeof(msg), "FLUSH."); 1121 break; 1122 case BIO_WRITE: 1123 (void)snprlcat(msg, sizeof(msg), "WRITE(%ju, %ju).", 1124 (uintmax_t)ggio->gctl_offset, (uintmax_t)ggio->gctl_length); 1125 break; 1126 default: 1127 (void)snprlcat(msg, sizeof(msg), "UNKNOWN(%u).", 1128 (unsigned int)ggio->gctl_cmd); 1129 break; 1130 } 1131 pjdlog_common(loglevel, debuglevel, -1, "%s", msg); 1132 } 1133 1134 static void 1135 remote_close(struct hast_resource *res, int ncomp) 1136 { 1137 1138 rw_wlock(&hio_remote_lock[ncomp]); 1139 /* 1140 * Check for a race between dropping rlock and acquiring wlock - 1141 * another thread can close connection in-between. 1142 */ 1143 if (!ISCONNECTED(res, ncomp)) { 1144 PJDLOG_ASSERT(res->hr_remotein == NULL); 1145 PJDLOG_ASSERT(res->hr_remoteout == NULL); 1146 rw_unlock(&hio_remote_lock[ncomp]); 1147 return; 1148 } 1149 1150 PJDLOG_ASSERT(res->hr_remotein != NULL); 1151 PJDLOG_ASSERT(res->hr_remoteout != NULL); 1152 1153 pjdlog_debug(2, "Closing incoming connection to %s.", 1154 res->hr_remoteaddr); 1155 proto_close(res->hr_remotein); 1156 res->hr_remotein = NULL; 1157 pjdlog_debug(2, "Closing outgoing connection to %s.", 1158 res->hr_remoteaddr); 1159 proto_close(res->hr_remoteout); 1160 res->hr_remoteout = NULL; 1161 1162 rw_unlock(&hio_remote_lock[ncomp]); 1163 1164 pjdlog_warning("Disconnected from %s.", res->hr_remoteaddr); 1165 1166 /* 1167 * Stop synchronization if in-progress. 1168 */ 1169 sync_stop(); 1170 1171 event_send(res, EVENT_DISCONNECT); 1172 } 1173 1174 /* 1175 * Acknowledge write completion to the kernel, but don't update activemap yet. 1176 */ 1177 static void 1178 write_complete(struct hast_resource *res, struct hio *hio) 1179 { 1180 struct g_gate_ctl_io *ggio; 1181 unsigned int ncomp; 1182 1183 PJDLOG_ASSERT(!hio->hio_done); 1184 1185 ggio = &hio->hio_ggio; 1186 PJDLOG_ASSERT(ggio->gctl_cmd == BIO_WRITE); 1187 1188 /* 1189 * Bump local count if this is first write after 1190 * connection failure with remote node. 1191 */ 1192 ncomp = 1; 1193 rw_rlock(&hio_remote_lock[ncomp]); 1194 if (!ISCONNECTED(res, ncomp)) { 1195 mtx_lock(&metadata_lock); 1196 if (res->hr_primary_localcnt == res->hr_secondary_remotecnt) { 1197 res->hr_primary_localcnt++; 1198 pjdlog_debug(1, "Increasing localcnt to %ju.", 1199 (uintmax_t)res->hr_primary_localcnt); 1200 (void)metadata_write(res); 1201 } 1202 mtx_unlock(&metadata_lock); 1203 } 1204 rw_unlock(&hio_remote_lock[ncomp]); 1205 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DONE, ggio) == -1) 1206 primary_exit(EX_OSERR, "G_GATE_CMD_DONE failed"); 1207 hio->hio_done = true; 1208 } 1209 1210 /* 1211 * Thread receives ggate I/O requests from the kernel and passes them to 1212 * appropriate threads: 1213 * WRITE - always goes to both local_send and remote_send threads 1214 * READ (when the block is up-to-date on local component) - 1215 * only local_send thread 1216 * READ (when the block isn't up-to-date on local component) - 1217 * only remote_send thread 1218 * DELETE - always goes to both local_send and remote_send threads 1219 * FLUSH - always goes to both local_send and remote_send threads 1220 */ 1221 static void * 1222 ggate_recv_thread(void *arg) 1223 { 1224 struct hast_resource *res = arg; 1225 struct g_gate_ctl_io *ggio; 1226 struct hio *hio; 1227 unsigned int ii, ncomp, ncomps; 1228 int error; 1229 1230 for (;;) { 1231 pjdlog_debug(2, "ggate_recv: Taking free request."); 1232 QUEUE_TAKE2(hio, free); 1233 pjdlog_debug(2, "ggate_recv: (%p) Got free request.", hio); 1234 ggio = &hio->hio_ggio; 1235 ggio->gctl_unit = res->hr_ggateunit; 1236 ggio->gctl_length = MAXPHYS; 1237 ggio->gctl_error = 0; 1238 hio->hio_done = false; 1239 hio->hio_replication = res->hr_replication; 1240 pjdlog_debug(2, 1241 "ggate_recv: (%p) Waiting for request from the kernel.", 1242 hio); 1243 if (ioctl(res->hr_ggatefd, G_GATE_CMD_START, ggio) == -1) { 1244 if (sigexit_received) 1245 pthread_exit(NULL); 1246 primary_exit(EX_OSERR, "G_GATE_CMD_START failed"); 1247 } 1248 error = ggio->gctl_error; 1249 switch (error) { 1250 case 0: 1251 break; 1252 case ECANCELED: 1253 /* Exit gracefully. */ 1254 if (!sigexit_received) { 1255 pjdlog_debug(2, 1256 "ggate_recv: (%p) Received cancel from the kernel.", 1257 hio); 1258 pjdlog_info("Received cancel from the kernel, exiting."); 1259 } 1260 pthread_exit(NULL); 1261 case ENOMEM: 1262 /* 1263 * Buffer too small? Impossible, we allocate MAXPHYS 1264 * bytes - request can't be bigger than that. 1265 */ 1266 /* FALLTHROUGH */ 1267 case ENXIO: 1268 default: 1269 primary_exitx(EX_OSERR, "G_GATE_CMD_START failed: %s.", 1270 strerror(error)); 1271 } 1272 1273 ncomp = 0; 1274 ncomps = HAST_NCOMPONENTS; 1275 1276 for (ii = 0; ii < ncomps; ii++) 1277 hio->hio_errors[ii] = EINVAL; 1278 reqlog(LOG_DEBUG, 2, ggio, 1279 "ggate_recv: (%p) Request received from the kernel: ", 1280 hio); 1281 1282 /* 1283 * Inform all components about new write request. 1284 * For read request prefer local component unless the given 1285 * range is out-of-date, then use remote component. 1286 */ 1287 switch (ggio->gctl_cmd) { 1288 case BIO_READ: 1289 res->hr_stat_read++; 1290 ncomps = 1; 1291 mtx_lock(&metadata_lock); 1292 if (res->hr_syncsrc == HAST_SYNCSRC_UNDEF || 1293 res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 1294 /* 1295 * This range is up-to-date on local component, 1296 * so handle request locally. 1297 */ 1298 /* Local component is 0 for now. */ 1299 ncomp = 0; 1300 } else /* if (res->hr_syncsrc == 1301 HAST_SYNCSRC_SECONDARY) */ { 1302 PJDLOG_ASSERT(res->hr_syncsrc == 1303 HAST_SYNCSRC_SECONDARY); 1304 /* 1305 * This range is out-of-date on local component, 1306 * so send request to the remote node. 1307 */ 1308 /* Remote component is 1 for now. */ 1309 ncomp = 1; 1310 } 1311 mtx_unlock(&metadata_lock); 1312 break; 1313 case BIO_WRITE: 1314 res->hr_stat_write++; 1315 if (res->hr_resuid == 0 && 1316 res->hr_primary_localcnt == 0) { 1317 /* This is first write. */ 1318 res->hr_primary_localcnt = 1; 1319 } 1320 for (;;) { 1321 mtx_lock(&range_lock); 1322 if (rangelock_islocked(range_sync, 1323 ggio->gctl_offset, ggio->gctl_length)) { 1324 pjdlog_debug(2, 1325 "regular: Range offset=%jd length=%zu locked.", 1326 (intmax_t)ggio->gctl_offset, 1327 (size_t)ggio->gctl_length); 1328 range_regular_wait = true; 1329 cv_wait(&range_regular_cond, &range_lock); 1330 range_regular_wait = false; 1331 mtx_unlock(&range_lock); 1332 continue; 1333 } 1334 if (rangelock_add(range_regular, 1335 ggio->gctl_offset, ggio->gctl_length) == -1) { 1336 mtx_unlock(&range_lock); 1337 pjdlog_debug(2, 1338 "regular: Range offset=%jd length=%zu is already locked, waiting.", 1339 (intmax_t)ggio->gctl_offset, 1340 (size_t)ggio->gctl_length); 1341 sleep(1); 1342 continue; 1343 } 1344 mtx_unlock(&range_lock); 1345 break; 1346 } 1347 mtx_lock(&res->hr_amp_lock); 1348 if (activemap_write_start(res->hr_amp, 1349 ggio->gctl_offset, ggio->gctl_length)) { 1350 res->hr_stat_activemap_update++; 1351 (void)hast_activemap_flush(res); 1352 } else { 1353 mtx_unlock(&res->hr_amp_lock); 1354 } 1355 if (ISMEMSYNC(hio)) { 1356 hio->hio_memsyncacked = false; 1357 refcnt_init(&hio->hio_writecount, ncomps); 1358 } 1359 break; 1360 case BIO_DELETE: 1361 res->hr_stat_delete++; 1362 break; 1363 case BIO_FLUSH: 1364 res->hr_stat_flush++; 1365 break; 1366 } 1367 pjdlog_debug(2, 1368 "ggate_recv: (%p) Moving request to the send queues.", hio); 1369 refcnt_init(&hio->hio_countdown, ncomps); 1370 for (ii = ncomp; ii < ncomps; ii++) 1371 QUEUE_INSERT1(hio, send, ii); 1372 } 1373 /* NOTREACHED */ 1374 return (NULL); 1375 } 1376 1377 /* 1378 * Thread reads from or writes to local component. 1379 * If local read fails, it redirects it to remote_send thread. 1380 */ 1381 static void * 1382 local_send_thread(void *arg) 1383 { 1384 struct hast_resource *res = arg; 1385 struct g_gate_ctl_io *ggio; 1386 struct hio *hio; 1387 unsigned int ncomp, rncomp; 1388 ssize_t ret; 1389 1390 /* Local component is 0 for now. */ 1391 ncomp = 0; 1392 /* Remote component is 1 for now. */ 1393 rncomp = 1; 1394 1395 for (;;) { 1396 pjdlog_debug(2, "local_send: Taking request."); 1397 QUEUE_TAKE1(hio, send, ncomp, 0); 1398 pjdlog_debug(2, "local_send: (%p) Got request.", hio); 1399 ggio = &hio->hio_ggio; 1400 switch (ggio->gctl_cmd) { 1401 case BIO_READ: 1402 ret = pread(res->hr_localfd, ggio->gctl_data, 1403 ggio->gctl_length, 1404 ggio->gctl_offset + res->hr_localoff); 1405 if (ret == ggio->gctl_length) 1406 hio->hio_errors[ncomp] = 0; 1407 else if (!ISSYNCREQ(hio)) { 1408 /* 1409 * If READ failed, try to read from remote node. 1410 */ 1411 if (ret == -1) { 1412 reqlog(LOG_WARNING, 0, ggio, 1413 "Local request failed (%s), trying remote node. ", 1414 strerror(errno)); 1415 } else if (ret != ggio->gctl_length) { 1416 reqlog(LOG_WARNING, 0, ggio, 1417 "Local request failed (%zd != %jd), trying remote node. ", 1418 ret, (intmax_t)ggio->gctl_length); 1419 } 1420 QUEUE_INSERT1(hio, send, rncomp); 1421 continue; 1422 } 1423 break; 1424 case BIO_WRITE: 1425 ret = pwrite(res->hr_localfd, ggio->gctl_data, 1426 ggio->gctl_length, 1427 ggio->gctl_offset + res->hr_localoff); 1428 if (ret == -1) { 1429 hio->hio_errors[ncomp] = errno; 1430 reqlog(LOG_WARNING, 0, ggio, 1431 "Local request failed (%s): ", 1432 strerror(errno)); 1433 } else if (ret != ggio->gctl_length) { 1434 hio->hio_errors[ncomp] = EIO; 1435 reqlog(LOG_WARNING, 0, ggio, 1436 "Local request failed (%zd != %jd): ", 1437 ret, (intmax_t)ggio->gctl_length); 1438 } else { 1439 hio->hio_errors[ncomp] = 0; 1440 if (ISASYNC(hio)) { 1441 ggio->gctl_error = 0; 1442 write_complete(res, hio); 1443 } 1444 } 1445 break; 1446 case BIO_DELETE: 1447 ret = g_delete(res->hr_localfd, 1448 ggio->gctl_offset + res->hr_localoff, 1449 ggio->gctl_length); 1450 if (ret == -1) { 1451 hio->hio_errors[ncomp] = errno; 1452 reqlog(LOG_WARNING, 0, ggio, 1453 "Local request failed (%s): ", 1454 strerror(errno)); 1455 } else { 1456 hio->hio_errors[ncomp] = 0; 1457 } 1458 break; 1459 case BIO_FLUSH: 1460 if (!res->hr_localflush) { 1461 ret = -1; 1462 errno = EOPNOTSUPP; 1463 break; 1464 } 1465 ret = g_flush(res->hr_localfd); 1466 if (ret == -1) { 1467 if (errno == EOPNOTSUPP) 1468 res->hr_localflush = false; 1469 hio->hio_errors[ncomp] = errno; 1470 reqlog(LOG_WARNING, 0, ggio, 1471 "Local request failed (%s): ", 1472 strerror(errno)); 1473 } else { 1474 hio->hio_errors[ncomp] = 0; 1475 } 1476 break; 1477 } 1478 if (ISMEMSYNCWRITE(hio)) { 1479 if (refcnt_release(&hio->hio_writecount) == 0) { 1480 write_complete(res, hio); 1481 } 1482 } 1483 if (refcnt_release(&hio->hio_countdown) > 0) 1484 continue; 1485 if (ISSYNCREQ(hio)) { 1486 mtx_lock(&sync_lock); 1487 SYNCREQDONE(hio); 1488 mtx_unlock(&sync_lock); 1489 cv_signal(&sync_cond); 1490 } else { 1491 pjdlog_debug(2, 1492 "local_send: (%p) Moving request to the done queue.", 1493 hio); 1494 QUEUE_INSERT2(hio, done); 1495 } 1496 } 1497 /* NOTREACHED */ 1498 return (NULL); 1499 } 1500 1501 static void 1502 keepalive_send(struct hast_resource *res, unsigned int ncomp) 1503 { 1504 struct nv *nv; 1505 1506 rw_rlock(&hio_remote_lock[ncomp]); 1507 1508 if (!ISCONNECTED(res, ncomp)) { 1509 rw_unlock(&hio_remote_lock[ncomp]); 1510 return; 1511 } 1512 1513 PJDLOG_ASSERT(res->hr_remotein != NULL); 1514 PJDLOG_ASSERT(res->hr_remoteout != NULL); 1515 1516 nv = nv_alloc(); 1517 nv_add_uint8(nv, HIO_KEEPALIVE, "cmd"); 1518 if (nv_error(nv) != 0) { 1519 rw_unlock(&hio_remote_lock[ncomp]); 1520 nv_free(nv); 1521 pjdlog_debug(1, 1522 "keepalive_send: Unable to prepare header to send."); 1523 return; 1524 } 1525 if (hast_proto_send(res, res->hr_remoteout, nv, NULL, 0) == -1) { 1526 rw_unlock(&hio_remote_lock[ncomp]); 1527 pjdlog_common(LOG_DEBUG, 1, errno, 1528 "keepalive_send: Unable to send request"); 1529 nv_free(nv); 1530 remote_close(res, ncomp); 1531 return; 1532 } 1533 1534 rw_unlock(&hio_remote_lock[ncomp]); 1535 nv_free(nv); 1536 pjdlog_debug(2, "keepalive_send: Request sent."); 1537 } 1538 1539 /* 1540 * Thread sends request to secondary node. 1541 */ 1542 static void * 1543 remote_send_thread(void *arg) 1544 { 1545 struct hast_resource *res = arg; 1546 struct g_gate_ctl_io *ggio; 1547 time_t lastcheck, now; 1548 struct hio *hio; 1549 struct nv *nv; 1550 unsigned int ncomp; 1551 bool wakeup; 1552 uint64_t offset, length; 1553 uint8_t cmd; 1554 void *data; 1555 1556 /* Remote component is 1 for now. */ 1557 ncomp = 1; 1558 lastcheck = time(NULL); 1559 1560 for (;;) { 1561 pjdlog_debug(2, "remote_send: Taking request."); 1562 QUEUE_TAKE1(hio, send, ncomp, HAST_KEEPALIVE); 1563 if (hio == NULL) { 1564 now = time(NULL); 1565 if (lastcheck + HAST_KEEPALIVE <= now) { 1566 keepalive_send(res, ncomp); 1567 lastcheck = now; 1568 } 1569 continue; 1570 } 1571 pjdlog_debug(2, "remote_send: (%p) Got request.", hio); 1572 ggio = &hio->hio_ggio; 1573 switch (ggio->gctl_cmd) { 1574 case BIO_READ: 1575 cmd = HIO_READ; 1576 data = NULL; 1577 offset = ggio->gctl_offset; 1578 length = ggio->gctl_length; 1579 break; 1580 case BIO_WRITE: 1581 cmd = HIO_WRITE; 1582 data = ggio->gctl_data; 1583 offset = ggio->gctl_offset; 1584 length = ggio->gctl_length; 1585 break; 1586 case BIO_DELETE: 1587 cmd = HIO_DELETE; 1588 data = NULL; 1589 offset = ggio->gctl_offset; 1590 length = ggio->gctl_length; 1591 break; 1592 case BIO_FLUSH: 1593 cmd = HIO_FLUSH; 1594 data = NULL; 1595 offset = 0; 1596 length = 0; 1597 break; 1598 default: 1599 PJDLOG_ABORT("invalid condition"); 1600 } 1601 nv = nv_alloc(); 1602 nv_add_uint8(nv, cmd, "cmd"); 1603 nv_add_uint64(nv, (uint64_t)ggio->gctl_seq, "seq"); 1604 nv_add_uint64(nv, offset, "offset"); 1605 nv_add_uint64(nv, length, "length"); 1606 if (ISMEMSYNCWRITE(hio)) 1607 nv_add_uint8(nv, 1, "memsync"); 1608 if (nv_error(nv) != 0) { 1609 hio->hio_errors[ncomp] = nv_error(nv); 1610 pjdlog_debug(2, 1611 "remote_send: (%p) Unable to prepare header to send.", 1612 hio); 1613 reqlog(LOG_ERR, 0, ggio, 1614 "Unable to prepare header to send (%s): ", 1615 strerror(nv_error(nv))); 1616 /* Move failed request immediately to the done queue. */ 1617 goto done_queue; 1618 } 1619 /* 1620 * Protect connection from disappearing. 1621 */ 1622 rw_rlock(&hio_remote_lock[ncomp]); 1623 if (!ISCONNECTED(res, ncomp)) { 1624 rw_unlock(&hio_remote_lock[ncomp]); 1625 hio->hio_errors[ncomp] = ENOTCONN; 1626 goto done_queue; 1627 } 1628 /* 1629 * Move the request to recv queue before sending it, because 1630 * in different order we can get reply before we move request 1631 * to recv queue. 1632 */ 1633 pjdlog_debug(2, 1634 "remote_send: (%p) Moving request to the recv queue.", 1635 hio); 1636 mtx_lock(&hio_recv_list_lock[ncomp]); 1637 wakeup = TAILQ_EMPTY(&hio_recv_list[ncomp]); 1638 TAILQ_INSERT_TAIL(&hio_recv_list[ncomp], hio, hio_next[ncomp]); 1639 hio_recv_list_size[ncomp]++; 1640 mtx_unlock(&hio_recv_list_lock[ncomp]); 1641 if (hast_proto_send(res, res->hr_remoteout, nv, data, 1642 data != NULL ? length : 0) == -1) { 1643 hio->hio_errors[ncomp] = errno; 1644 rw_unlock(&hio_remote_lock[ncomp]); 1645 pjdlog_debug(2, 1646 "remote_send: (%p) Unable to send request.", hio); 1647 reqlog(LOG_ERR, 0, ggio, 1648 "Unable to send request (%s): ", 1649 strerror(hio->hio_errors[ncomp])); 1650 remote_close(res, ncomp); 1651 } else { 1652 rw_unlock(&hio_remote_lock[ncomp]); 1653 } 1654 nv_free(nv); 1655 if (wakeup) 1656 cv_signal(&hio_recv_list_cond[ncomp]); 1657 continue; 1658 done_queue: 1659 nv_free(nv); 1660 if (ISSYNCREQ(hio)) { 1661 if (refcnt_release(&hio->hio_countdown) > 0) 1662 continue; 1663 mtx_lock(&sync_lock); 1664 SYNCREQDONE(hio); 1665 mtx_unlock(&sync_lock); 1666 cv_signal(&sync_cond); 1667 continue; 1668 } 1669 if (ggio->gctl_cmd == BIO_WRITE) { 1670 mtx_lock(&res->hr_amp_lock); 1671 if (activemap_need_sync(res->hr_amp, ggio->gctl_offset, 1672 ggio->gctl_length)) { 1673 (void)hast_activemap_flush(res); 1674 } else { 1675 mtx_unlock(&res->hr_amp_lock); 1676 } 1677 if (ISMEMSYNCWRITE(hio)) { 1678 if (refcnt_release(&hio->hio_writecount) == 0) { 1679 if (hio->hio_errors[0] == 0) 1680 write_complete(res, hio); 1681 } 1682 } 1683 } 1684 if (refcnt_release(&hio->hio_countdown) > 0) 1685 continue; 1686 pjdlog_debug(2, 1687 "remote_send: (%p) Moving request to the done queue.", 1688 hio); 1689 QUEUE_INSERT2(hio, done); 1690 } 1691 /* NOTREACHED */ 1692 return (NULL); 1693 } 1694 1695 /* 1696 * Thread receives answer from secondary node and passes it to ggate_send 1697 * thread. 1698 */ 1699 static void * 1700 remote_recv_thread(void *arg) 1701 { 1702 struct hast_resource *res = arg; 1703 struct g_gate_ctl_io *ggio; 1704 struct hio *hio; 1705 struct nv *nv; 1706 unsigned int ncomp; 1707 uint64_t seq; 1708 bool memsyncack; 1709 int error; 1710 1711 /* Remote component is 1 for now. */ 1712 ncomp = 1; 1713 1714 for (;;) { 1715 /* Wait until there is anything to receive. */ 1716 mtx_lock(&hio_recv_list_lock[ncomp]); 1717 while (TAILQ_EMPTY(&hio_recv_list[ncomp])) { 1718 pjdlog_debug(2, "remote_recv: No requests, waiting."); 1719 cv_wait(&hio_recv_list_cond[ncomp], 1720 &hio_recv_list_lock[ncomp]); 1721 } 1722 mtx_unlock(&hio_recv_list_lock[ncomp]); 1723 1724 memsyncack = false; 1725 1726 rw_rlock(&hio_remote_lock[ncomp]); 1727 if (!ISCONNECTED(res, ncomp)) { 1728 rw_unlock(&hio_remote_lock[ncomp]); 1729 /* 1730 * Connection is dead, so move all pending requests to 1731 * the done queue (one-by-one). 1732 */ 1733 mtx_lock(&hio_recv_list_lock[ncomp]); 1734 hio = TAILQ_FIRST(&hio_recv_list[ncomp]); 1735 PJDLOG_ASSERT(hio != NULL); 1736 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1737 hio_next[ncomp]); 1738 hio_recv_list_size[ncomp]--; 1739 mtx_unlock(&hio_recv_list_lock[ncomp]); 1740 hio->hio_errors[ncomp] = ENOTCONN; 1741 goto done_queue; 1742 } 1743 if (hast_proto_recv_hdr(res->hr_remotein, &nv) == -1) { 1744 pjdlog_errno(LOG_ERR, 1745 "Unable to receive reply header"); 1746 rw_unlock(&hio_remote_lock[ncomp]); 1747 remote_close(res, ncomp); 1748 continue; 1749 } 1750 rw_unlock(&hio_remote_lock[ncomp]); 1751 seq = nv_get_uint64(nv, "seq"); 1752 if (seq == 0) { 1753 pjdlog_error("Header contains no 'seq' field."); 1754 nv_free(nv); 1755 continue; 1756 } 1757 memsyncack = nv_exists(nv, "received"); 1758 mtx_lock(&hio_recv_list_lock[ncomp]); 1759 TAILQ_FOREACH(hio, &hio_recv_list[ncomp], hio_next[ncomp]) { 1760 if (hio->hio_ggio.gctl_seq == seq) { 1761 TAILQ_REMOVE(&hio_recv_list[ncomp], hio, 1762 hio_next[ncomp]); 1763 hio_recv_list_size[ncomp]--; 1764 break; 1765 } 1766 } 1767 mtx_unlock(&hio_recv_list_lock[ncomp]); 1768 if (hio == NULL) { 1769 pjdlog_error("Found no request matching received 'seq' field (%ju).", 1770 (uintmax_t)seq); 1771 nv_free(nv); 1772 continue; 1773 } 1774 ggio = &hio->hio_ggio; 1775 error = nv_get_int16(nv, "error"); 1776 if (error != 0) { 1777 /* Request failed on remote side. */ 1778 hio->hio_errors[ncomp] = error; 1779 reqlog(LOG_WARNING, 0, ggio, 1780 "Remote request failed (%s): ", strerror(error)); 1781 nv_free(nv); 1782 goto done_queue; 1783 } 1784 switch (ggio->gctl_cmd) { 1785 case BIO_READ: 1786 rw_rlock(&hio_remote_lock[ncomp]); 1787 if (!ISCONNECTED(res, ncomp)) { 1788 rw_unlock(&hio_remote_lock[ncomp]); 1789 nv_free(nv); 1790 goto done_queue; 1791 } 1792 if (hast_proto_recv_data(res, res->hr_remotein, nv, 1793 ggio->gctl_data, ggio->gctl_length) == -1) { 1794 hio->hio_errors[ncomp] = errno; 1795 pjdlog_errno(LOG_ERR, 1796 "Unable to receive reply data"); 1797 rw_unlock(&hio_remote_lock[ncomp]); 1798 nv_free(nv); 1799 remote_close(res, ncomp); 1800 goto done_queue; 1801 } 1802 rw_unlock(&hio_remote_lock[ncomp]); 1803 break; 1804 case BIO_WRITE: 1805 case BIO_DELETE: 1806 case BIO_FLUSH: 1807 break; 1808 default: 1809 PJDLOG_ABORT("invalid condition"); 1810 } 1811 hio->hio_errors[ncomp] = 0; 1812 nv_free(nv); 1813 done_queue: 1814 if (ISMEMSYNCWRITE(hio)) { 1815 if (!hio->hio_memsyncacked) { 1816 PJDLOG_ASSERT(memsyncack || 1817 hio->hio_errors[ncomp] != 0); 1818 /* Remote ack arrived. */ 1819 if (refcnt_release(&hio->hio_writecount) == 0) { 1820 if (hio->hio_errors[0] == 0) 1821 write_complete(res, hio); 1822 } 1823 hio->hio_memsyncacked = true; 1824 if (hio->hio_errors[ncomp] == 0) { 1825 pjdlog_debug(2, 1826 "remote_recv: (%p) Moving request " 1827 "back to the recv queue.", hio); 1828 mtx_lock(&hio_recv_list_lock[ncomp]); 1829 TAILQ_INSERT_TAIL(&hio_recv_list[ncomp], 1830 hio, hio_next[ncomp]); 1831 hio_recv_list_size[ncomp]++; 1832 mtx_unlock(&hio_recv_list_lock[ncomp]); 1833 continue; 1834 } 1835 } else { 1836 PJDLOG_ASSERT(!memsyncack); 1837 /* Remote final reply arrived. */ 1838 } 1839 } 1840 if (refcnt_release(&hio->hio_countdown) > 0) 1841 continue; 1842 if (ISSYNCREQ(hio)) { 1843 mtx_lock(&sync_lock); 1844 SYNCREQDONE(hio); 1845 mtx_unlock(&sync_lock); 1846 cv_signal(&sync_cond); 1847 } else { 1848 pjdlog_debug(2, 1849 "remote_recv: (%p) Moving request to the done queue.", 1850 hio); 1851 QUEUE_INSERT2(hio, done); 1852 } 1853 } 1854 /* NOTREACHED */ 1855 return (NULL); 1856 } 1857 1858 /* 1859 * Thread sends answer to the kernel. 1860 */ 1861 static void * 1862 ggate_send_thread(void *arg) 1863 { 1864 struct hast_resource *res = arg; 1865 struct g_gate_ctl_io *ggio; 1866 struct hio *hio; 1867 unsigned int ii, ncomps; 1868 1869 ncomps = HAST_NCOMPONENTS; 1870 1871 for (;;) { 1872 pjdlog_debug(2, "ggate_send: Taking request."); 1873 QUEUE_TAKE2(hio, done); 1874 pjdlog_debug(2, "ggate_send: (%p) Got request.", hio); 1875 ggio = &hio->hio_ggio; 1876 for (ii = 0; ii < ncomps; ii++) { 1877 if (hio->hio_errors[ii] == 0) { 1878 /* 1879 * One successful request is enough to declare 1880 * success. 1881 */ 1882 ggio->gctl_error = 0; 1883 break; 1884 } 1885 } 1886 if (ii == ncomps) { 1887 /* 1888 * None of the requests were successful. 1889 * Use the error from local component except the 1890 * case when we did only remote request. 1891 */ 1892 if (ggio->gctl_cmd == BIO_READ && 1893 res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) 1894 ggio->gctl_error = hio->hio_errors[1]; 1895 else 1896 ggio->gctl_error = hio->hio_errors[0]; 1897 } 1898 if (ggio->gctl_error == 0 && ggio->gctl_cmd == BIO_WRITE) { 1899 mtx_lock(&res->hr_amp_lock); 1900 if (activemap_write_complete(res->hr_amp, 1901 ggio->gctl_offset, ggio->gctl_length)) { 1902 res->hr_stat_activemap_update++; 1903 (void)hast_activemap_flush(res); 1904 } else { 1905 mtx_unlock(&res->hr_amp_lock); 1906 } 1907 } 1908 if (ggio->gctl_cmd == BIO_WRITE) { 1909 /* 1910 * Unlock range we locked. 1911 */ 1912 mtx_lock(&range_lock); 1913 rangelock_del(range_regular, ggio->gctl_offset, 1914 ggio->gctl_length); 1915 if (range_sync_wait) 1916 cv_signal(&range_sync_cond); 1917 mtx_unlock(&range_lock); 1918 if (!hio->hio_done) 1919 write_complete(res, hio); 1920 } else { 1921 if (ioctl(res->hr_ggatefd, G_GATE_CMD_DONE, ggio) == -1) { 1922 primary_exit(EX_OSERR, 1923 "G_GATE_CMD_DONE failed"); 1924 } 1925 } 1926 if (hio->hio_errors[0]) { 1927 switch (ggio->gctl_cmd) { 1928 case BIO_READ: 1929 res->hr_stat_read_error++; 1930 break; 1931 case BIO_WRITE: 1932 res->hr_stat_write_error++; 1933 break; 1934 case BIO_DELETE: 1935 res->hr_stat_delete_error++; 1936 break; 1937 case BIO_FLUSH: 1938 res->hr_stat_flush_error++; 1939 break; 1940 } 1941 } 1942 pjdlog_debug(2, 1943 "ggate_send: (%p) Moving request to the free queue.", hio); 1944 QUEUE_INSERT2(hio, free); 1945 } 1946 /* NOTREACHED */ 1947 return (NULL); 1948 } 1949 1950 /* 1951 * Thread synchronize local and remote components. 1952 */ 1953 static void * 1954 sync_thread(void *arg __unused) 1955 { 1956 struct hast_resource *res = arg; 1957 struct hio *hio; 1958 struct g_gate_ctl_io *ggio; 1959 struct timeval tstart, tend, tdiff; 1960 unsigned int ii, ncomp, ncomps; 1961 off_t offset, length, synced; 1962 bool dorewind, directreads; 1963 int syncext; 1964 1965 ncomps = HAST_NCOMPONENTS; 1966 dorewind = true; 1967 synced = 0; 1968 offset = -1; 1969 directreads = false; 1970 1971 for (;;) { 1972 mtx_lock(&sync_lock); 1973 if (offset >= 0 && !sync_inprogress) { 1974 gettimeofday(&tend, NULL); 1975 timersub(&tend, &tstart, &tdiff); 1976 pjdlog_info("Synchronization interrupted after %#.0T. " 1977 "%NB synchronized so far.", &tdiff, 1978 (intmax_t)synced); 1979 event_send(res, EVENT_SYNCINTR); 1980 } 1981 while (!sync_inprogress) { 1982 dorewind = true; 1983 synced = 0; 1984 cv_wait(&sync_cond, &sync_lock); 1985 } 1986 mtx_unlock(&sync_lock); 1987 /* 1988 * Obtain offset at which we should synchronize. 1989 * Rewind synchronization if needed. 1990 */ 1991 mtx_lock(&res->hr_amp_lock); 1992 if (dorewind) 1993 activemap_sync_rewind(res->hr_amp); 1994 offset = activemap_sync_offset(res->hr_amp, &length, &syncext); 1995 if (syncext != -1) { 1996 /* 1997 * We synchronized entire syncext extent, we can mark 1998 * it as clean now. 1999 */ 2000 if (activemap_extent_complete(res->hr_amp, syncext)) 2001 (void)hast_activemap_flush(res); 2002 else 2003 mtx_unlock(&res->hr_amp_lock); 2004 } else { 2005 mtx_unlock(&res->hr_amp_lock); 2006 } 2007 if (dorewind) { 2008 dorewind = false; 2009 if (offset == -1) 2010 pjdlog_info("Nodes are in sync."); 2011 else { 2012 pjdlog_info("Synchronization started. %NB to go.", 2013 (intmax_t)(res->hr_extentsize * 2014 activemap_ndirty(res->hr_amp))); 2015 event_send(res, EVENT_SYNCSTART); 2016 gettimeofday(&tstart, NULL); 2017 } 2018 } 2019 if (offset == -1) { 2020 sync_stop(); 2021 pjdlog_debug(1, "Nothing to synchronize."); 2022 /* 2023 * Synchronization complete, make both localcnt and 2024 * remotecnt equal. 2025 */ 2026 ncomp = 1; 2027 rw_rlock(&hio_remote_lock[ncomp]); 2028 if (ISCONNECTED(res, ncomp)) { 2029 if (synced > 0) { 2030 int64_t bps; 2031 2032 gettimeofday(&tend, NULL); 2033 timersub(&tend, &tstart, &tdiff); 2034 bps = (int64_t)((double)synced / 2035 ((double)tdiff.tv_sec + 2036 (double)tdiff.tv_usec / 1000000)); 2037 pjdlog_info("Synchronization complete. " 2038 "%NB synchronized in %#.0lT (%NB/sec).", 2039 (intmax_t)synced, &tdiff, 2040 (intmax_t)bps); 2041 event_send(res, EVENT_SYNCDONE); 2042 } 2043 mtx_lock(&metadata_lock); 2044 if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) 2045 directreads = true; 2046 res->hr_syncsrc = HAST_SYNCSRC_UNDEF; 2047 res->hr_primary_localcnt = 2048 res->hr_secondary_remotecnt; 2049 res->hr_primary_remotecnt = 2050 res->hr_secondary_localcnt; 2051 pjdlog_debug(1, 2052 "Setting localcnt to %ju and remotecnt to %ju.", 2053 (uintmax_t)res->hr_primary_localcnt, 2054 (uintmax_t)res->hr_primary_remotecnt); 2055 (void)metadata_write(res); 2056 mtx_unlock(&metadata_lock); 2057 } 2058 rw_unlock(&hio_remote_lock[ncomp]); 2059 if (directreads) { 2060 directreads = false; 2061 enable_direct_reads(res); 2062 } 2063 continue; 2064 } 2065 pjdlog_debug(2, "sync: Taking free request."); 2066 QUEUE_TAKE2(hio, free); 2067 pjdlog_debug(2, "sync: (%p) Got free request.", hio); 2068 /* 2069 * Lock the range we are going to synchronize. We don't want 2070 * race where someone writes between our read and write. 2071 */ 2072 for (;;) { 2073 mtx_lock(&range_lock); 2074 if (rangelock_islocked(range_regular, offset, length)) { 2075 pjdlog_debug(2, 2076 "sync: Range offset=%jd length=%jd locked.", 2077 (intmax_t)offset, (intmax_t)length); 2078 range_sync_wait = true; 2079 cv_wait(&range_sync_cond, &range_lock); 2080 range_sync_wait = false; 2081 mtx_unlock(&range_lock); 2082 continue; 2083 } 2084 if (rangelock_add(range_sync, offset, length) == -1) { 2085 mtx_unlock(&range_lock); 2086 pjdlog_debug(2, 2087 "sync: Range offset=%jd length=%jd is already locked, waiting.", 2088 (intmax_t)offset, (intmax_t)length); 2089 sleep(1); 2090 continue; 2091 } 2092 mtx_unlock(&range_lock); 2093 break; 2094 } 2095 /* 2096 * First read the data from synchronization source. 2097 */ 2098 SYNCREQ(hio); 2099 ggio = &hio->hio_ggio; 2100 ggio->gctl_cmd = BIO_READ; 2101 ggio->gctl_offset = offset; 2102 ggio->gctl_length = length; 2103 ggio->gctl_error = 0; 2104 hio->hio_done = false; 2105 hio->hio_replication = res->hr_replication; 2106 for (ii = 0; ii < ncomps; ii++) 2107 hio->hio_errors[ii] = EINVAL; 2108 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 2109 hio); 2110 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 2111 hio); 2112 mtx_lock(&metadata_lock); 2113 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 2114 /* 2115 * This range is up-to-date on local component, 2116 * so handle request locally. 2117 */ 2118 /* Local component is 0 for now. */ 2119 ncomp = 0; 2120 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 2121 PJDLOG_ASSERT(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 2122 /* 2123 * This range is out-of-date on local component, 2124 * so send request to the remote node. 2125 */ 2126 /* Remote component is 1 for now. */ 2127 ncomp = 1; 2128 } 2129 mtx_unlock(&metadata_lock); 2130 refcnt_init(&hio->hio_countdown, 1); 2131 QUEUE_INSERT1(hio, send, ncomp); 2132 2133 /* 2134 * Let's wait for READ to finish. 2135 */ 2136 mtx_lock(&sync_lock); 2137 while (!ISSYNCREQDONE(hio)) 2138 cv_wait(&sync_cond, &sync_lock); 2139 mtx_unlock(&sync_lock); 2140 2141 if (hio->hio_errors[ncomp] != 0) { 2142 pjdlog_error("Unable to read synchronization data: %s.", 2143 strerror(hio->hio_errors[ncomp])); 2144 goto free_queue; 2145 } 2146 2147 /* 2148 * We read the data from synchronization source, now write it 2149 * to synchronization target. 2150 */ 2151 SYNCREQ(hio); 2152 ggio->gctl_cmd = BIO_WRITE; 2153 for (ii = 0; ii < ncomps; ii++) 2154 hio->hio_errors[ii] = EINVAL; 2155 reqlog(LOG_DEBUG, 2, ggio, "sync: (%p) Sending sync request: ", 2156 hio); 2157 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 2158 hio); 2159 mtx_lock(&metadata_lock); 2160 if (res->hr_syncsrc == HAST_SYNCSRC_PRIMARY) { 2161 /* 2162 * This range is up-to-date on local component, 2163 * so we update remote component. 2164 */ 2165 /* Remote component is 1 for now. */ 2166 ncomp = 1; 2167 } else /* if (res->hr_syncsrc == HAST_SYNCSRC_SECONDARY) */ { 2168 PJDLOG_ASSERT(res->hr_syncsrc == HAST_SYNCSRC_SECONDARY); 2169 /* 2170 * This range is out-of-date on local component, 2171 * so we update it. 2172 */ 2173 /* Local component is 0 for now. */ 2174 ncomp = 0; 2175 } 2176 mtx_unlock(&metadata_lock); 2177 2178 pjdlog_debug(2, "sync: (%p) Moving request to the send queue.", 2179 hio); 2180 refcnt_init(&hio->hio_countdown, 1); 2181 QUEUE_INSERT1(hio, send, ncomp); 2182 2183 /* 2184 * Let's wait for WRITE to finish. 2185 */ 2186 mtx_lock(&sync_lock); 2187 while (!ISSYNCREQDONE(hio)) 2188 cv_wait(&sync_cond, &sync_lock); 2189 mtx_unlock(&sync_lock); 2190 2191 if (hio->hio_errors[ncomp] != 0) { 2192 pjdlog_error("Unable to write synchronization data: %s.", 2193 strerror(hio->hio_errors[ncomp])); 2194 goto free_queue; 2195 } 2196 2197 synced += length; 2198 free_queue: 2199 mtx_lock(&range_lock); 2200 rangelock_del(range_sync, offset, length); 2201 if (range_regular_wait) 2202 cv_signal(&range_regular_cond); 2203 mtx_unlock(&range_lock); 2204 pjdlog_debug(2, "sync: (%p) Moving request to the free queue.", 2205 hio); 2206 QUEUE_INSERT2(hio, free); 2207 } 2208 /* NOTREACHED */ 2209 return (NULL); 2210 } 2211 2212 void 2213 primary_config_reload(struct hast_resource *res, struct nv *nv) 2214 { 2215 unsigned int ii, ncomps; 2216 int modified, vint; 2217 const char *vstr; 2218 2219 pjdlog_info("Reloading configuration..."); 2220 2221 PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY); 2222 PJDLOG_ASSERT(gres == res); 2223 nv_assert(nv, "remoteaddr"); 2224 nv_assert(nv, "sourceaddr"); 2225 nv_assert(nv, "replication"); 2226 nv_assert(nv, "checksum"); 2227 nv_assert(nv, "compression"); 2228 nv_assert(nv, "timeout"); 2229 nv_assert(nv, "exec"); 2230 nv_assert(nv, "metaflush"); 2231 2232 ncomps = HAST_NCOMPONENTS; 2233 2234 #define MODIFIED_REMOTEADDR 0x01 2235 #define MODIFIED_SOURCEADDR 0x02 2236 #define MODIFIED_REPLICATION 0x04 2237 #define MODIFIED_CHECKSUM 0x08 2238 #define MODIFIED_COMPRESSION 0x10 2239 #define MODIFIED_TIMEOUT 0x20 2240 #define MODIFIED_EXEC 0x40 2241 #define MODIFIED_METAFLUSH 0x80 2242 modified = 0; 2243 2244 vstr = nv_get_string(nv, "remoteaddr"); 2245 if (strcmp(gres->hr_remoteaddr, vstr) != 0) { 2246 /* 2247 * Don't copy res->hr_remoteaddr to gres just yet. 2248 * We want remote_close() to log disconnect from the old 2249 * addresses, not from the new ones. 2250 */ 2251 modified |= MODIFIED_REMOTEADDR; 2252 } 2253 vstr = nv_get_string(nv, "sourceaddr"); 2254 if (strcmp(gres->hr_sourceaddr, vstr) != 0) { 2255 strlcpy(gres->hr_sourceaddr, vstr, sizeof(gres->hr_sourceaddr)); 2256 modified |= MODIFIED_SOURCEADDR; 2257 } 2258 vint = nv_get_int32(nv, "replication"); 2259 if (gres->hr_replication != vint) { 2260 gres->hr_replication = vint; 2261 modified |= MODIFIED_REPLICATION; 2262 } 2263 vint = nv_get_int32(nv, "checksum"); 2264 if (gres->hr_checksum != vint) { 2265 gres->hr_checksum = vint; 2266 modified |= MODIFIED_CHECKSUM; 2267 } 2268 vint = nv_get_int32(nv, "compression"); 2269 if (gres->hr_compression != vint) { 2270 gres->hr_compression = vint; 2271 modified |= MODIFIED_COMPRESSION; 2272 } 2273 vint = nv_get_int32(nv, "timeout"); 2274 if (gres->hr_timeout != vint) { 2275 gres->hr_timeout = vint; 2276 modified |= MODIFIED_TIMEOUT; 2277 } 2278 vstr = nv_get_string(nv, "exec"); 2279 if (strcmp(gres->hr_exec, vstr) != 0) { 2280 strlcpy(gres->hr_exec, vstr, sizeof(gres->hr_exec)); 2281 modified |= MODIFIED_EXEC; 2282 } 2283 vint = nv_get_int32(nv, "metaflush"); 2284 if (gres->hr_metaflush != vint) { 2285 gres->hr_metaflush = vint; 2286 modified |= MODIFIED_METAFLUSH; 2287 } 2288 2289 /* 2290 * Change timeout for connected sockets. 2291 * Don't bother if we need to reconnect. 2292 */ 2293 if ((modified & MODIFIED_TIMEOUT) != 0 && 2294 (modified & (MODIFIED_REMOTEADDR | MODIFIED_SOURCEADDR)) == 0) { 2295 for (ii = 0; ii < ncomps; ii++) { 2296 if (!ISREMOTE(ii)) 2297 continue; 2298 rw_rlock(&hio_remote_lock[ii]); 2299 if (!ISCONNECTED(gres, ii)) { 2300 rw_unlock(&hio_remote_lock[ii]); 2301 continue; 2302 } 2303 rw_unlock(&hio_remote_lock[ii]); 2304 if (proto_timeout(gres->hr_remotein, 2305 gres->hr_timeout) == -1) { 2306 pjdlog_errno(LOG_WARNING, 2307 "Unable to set connection timeout"); 2308 } 2309 if (proto_timeout(gres->hr_remoteout, 2310 gres->hr_timeout) == -1) { 2311 pjdlog_errno(LOG_WARNING, 2312 "Unable to set connection timeout"); 2313 } 2314 } 2315 } 2316 if ((modified & (MODIFIED_REMOTEADDR | MODIFIED_SOURCEADDR)) != 0) { 2317 for (ii = 0; ii < ncomps; ii++) { 2318 if (!ISREMOTE(ii)) 2319 continue; 2320 remote_close(gres, ii); 2321 } 2322 if (modified & MODIFIED_REMOTEADDR) { 2323 vstr = nv_get_string(nv, "remoteaddr"); 2324 strlcpy(gres->hr_remoteaddr, vstr, 2325 sizeof(gres->hr_remoteaddr)); 2326 } 2327 } 2328 #undef MODIFIED_REMOTEADDR 2329 #undef MODIFIED_SOURCEADDR 2330 #undef MODIFIED_REPLICATION 2331 #undef MODIFIED_CHECKSUM 2332 #undef MODIFIED_COMPRESSION 2333 #undef MODIFIED_TIMEOUT 2334 #undef MODIFIED_EXEC 2335 #undef MODIFIED_METAFLUSH 2336 2337 pjdlog_info("Configuration reloaded successfully."); 2338 } 2339 2340 static void 2341 guard_one(struct hast_resource *res, unsigned int ncomp) 2342 { 2343 struct proto_conn *in, *out; 2344 2345 if (!ISREMOTE(ncomp)) 2346 return; 2347 2348 rw_rlock(&hio_remote_lock[ncomp]); 2349 2350 if (!real_remote(res)) { 2351 rw_unlock(&hio_remote_lock[ncomp]); 2352 return; 2353 } 2354 2355 if (ISCONNECTED(res, ncomp)) { 2356 PJDLOG_ASSERT(res->hr_remotein != NULL); 2357 PJDLOG_ASSERT(res->hr_remoteout != NULL); 2358 rw_unlock(&hio_remote_lock[ncomp]); 2359 pjdlog_debug(2, "remote_guard: Connection to %s is ok.", 2360 res->hr_remoteaddr); 2361 return; 2362 } 2363 2364 PJDLOG_ASSERT(res->hr_remotein == NULL); 2365 PJDLOG_ASSERT(res->hr_remoteout == NULL); 2366 /* 2367 * Upgrade the lock. It doesn't have to be atomic as no other thread 2368 * can change connection status from disconnected to connected. 2369 */ 2370 rw_unlock(&hio_remote_lock[ncomp]); 2371 pjdlog_debug(2, "remote_guard: Reconnecting to %s.", 2372 res->hr_remoteaddr); 2373 in = out = NULL; 2374 if (init_remote(res, &in, &out) == 0) { 2375 rw_wlock(&hio_remote_lock[ncomp]); 2376 PJDLOG_ASSERT(res->hr_remotein == NULL); 2377 PJDLOG_ASSERT(res->hr_remoteout == NULL); 2378 PJDLOG_ASSERT(in != NULL && out != NULL); 2379 res->hr_remotein = in; 2380 res->hr_remoteout = out; 2381 rw_unlock(&hio_remote_lock[ncomp]); 2382 pjdlog_info("Successfully reconnected to %s.", 2383 res->hr_remoteaddr); 2384 sync_start(); 2385 } else { 2386 /* Both connections should be NULL. */ 2387 PJDLOG_ASSERT(res->hr_remotein == NULL); 2388 PJDLOG_ASSERT(res->hr_remoteout == NULL); 2389 PJDLOG_ASSERT(in == NULL && out == NULL); 2390 pjdlog_debug(2, "remote_guard: Reconnect to %s failed.", 2391 res->hr_remoteaddr); 2392 } 2393 } 2394 2395 /* 2396 * Thread guards remote connections and reconnects when needed, handles 2397 * signals, etc. 2398 */ 2399 static void * 2400 guard_thread(void *arg) 2401 { 2402 struct hast_resource *res = arg; 2403 unsigned int ii, ncomps; 2404 struct timespec timeout; 2405 time_t lastcheck, now; 2406 sigset_t mask; 2407 int signo; 2408 2409 ncomps = HAST_NCOMPONENTS; 2410 lastcheck = time(NULL); 2411 2412 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 2413 PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0); 2414 PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0); 2415 2416 timeout.tv_sec = HAST_KEEPALIVE; 2417 timeout.tv_nsec = 0; 2418 signo = -1; 2419 2420 for (;;) { 2421 switch (signo) { 2422 case SIGINT: 2423 case SIGTERM: 2424 sigexit_received = true; 2425 primary_exitx(EX_OK, 2426 "Termination signal received, exiting."); 2427 break; 2428 default: 2429 break; 2430 } 2431 2432 /* 2433 * Don't check connections until we fully started, 2434 * as we may still be looping, waiting for remote node 2435 * to switch from primary to secondary. 2436 */ 2437 if (fullystarted) { 2438 pjdlog_debug(2, "remote_guard: Checking connections."); 2439 now = time(NULL); 2440 if (lastcheck + HAST_KEEPALIVE <= now) { 2441 for (ii = 0; ii < ncomps; ii++) 2442 guard_one(res, ii); 2443 lastcheck = now; 2444 } 2445 } 2446 signo = sigtimedwait(&mask, NULL, &timeout); 2447 } 2448 /* NOTREACHED */ 2449 return (NULL); 2450 } 2451