secondary.c revision 220271
1/*- 2 * Copyright (c) 2009-2010 The FreeBSD Foundation 3 * Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 4 * All rights reserved. 5 * 6 * This software was developed by Pawel Jakub Dawidek under sponsorship from 7 * the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: head/sbin/hastd/secondary.c 220271 2011-04-02 09:25:13Z pjd $"); 33 34#include <sys/param.h> 35#include <sys/time.h> 36#include <sys/bio.h> 37#include <sys/disk.h> 38#include <sys/stat.h> 39 40#include <err.h> 41#include <errno.h> 42#include <fcntl.h> 43#include <libgeom.h> 44#include <pthread.h> 45#include <signal.h> 46#include <stdint.h> 47#include <stdio.h> 48#include <string.h> 49#include <sysexits.h> 50#include <unistd.h> 51 52#include <activemap.h> 53#include <nv.h> 54#include <pjdlog.h> 55 56#include "control.h" 57#include "event.h" 58#include "hast.h" 59#include "hast_proto.h" 60#include "hastd.h" 61#include "hooks.h" 62#include "metadata.h" 63#include "proto.h" 64#include "subr.h" 65#include "synch.h" 66 67struct hio { 68 uint64_t hio_seq; 69 int hio_error; 70 struct nv *hio_nv; 71 void *hio_data; 72 uint8_t hio_cmd; 73 uint64_t hio_offset; 74 uint64_t hio_length; 75 TAILQ_ENTRY(hio) hio_next; 76}; 77 78static struct hast_resource *gres; 79 80/* 81 * Free list holds unused structures. When free list is empty, we have to wait 82 * until some in-progress requests are freed. 83 */ 84static TAILQ_HEAD(, hio) hio_free_list; 85static pthread_mutex_t hio_free_list_lock; 86static pthread_cond_t hio_free_list_cond; 87/* 88 * Disk thread (the one that do I/O requests) takes requests from this list. 89 */ 90static TAILQ_HEAD(, hio) hio_disk_list; 91static pthread_mutex_t hio_disk_list_lock; 92static pthread_cond_t hio_disk_list_cond; 93/* 94 * There is one recv list for every component, although local components don't 95 * use recv lists as local requests are done synchronously. 96 */ 97static TAILQ_HEAD(, hio) hio_send_list; 98static pthread_mutex_t hio_send_list_lock; 99static pthread_cond_t hio_send_list_cond; 100 101/* 102 * Maximum number of outstanding I/O requests. 103 */ 104#define HAST_HIO_MAX 256 105 106static void *recv_thread(void *arg); 107static void *disk_thread(void *arg); 108static void *send_thread(void *arg); 109 110#define QUEUE_INSERT(name, hio) do { \ 111 bool _wakeup; \ 112 \ 113 mtx_lock(&hio_##name##_list_lock); \ 114 _wakeup = TAILQ_EMPTY(&hio_##name##_list); \ 115 TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_next); \ 116 mtx_unlock(&hio_##name##_list_lock); \ 117 if (_wakeup) \ 118 cv_signal(&hio_##name##_list_cond); \ 119} while (0) 120#define QUEUE_TAKE(name, hio) do { \ 121 mtx_lock(&hio_##name##_list_lock); \ 122 while (((hio) = TAILQ_FIRST(&hio_##name##_list)) == NULL) { \ 123 cv_wait(&hio_##name##_list_cond, \ 124 &hio_##name##_list_lock); \ 125 } \ 126 TAILQ_REMOVE(&hio_##name##_list, (hio), hio_next); \ 127 mtx_unlock(&hio_##name##_list_lock); \ 128} while (0) 129 130static void 131init_environment(void) 132{ 133 struct hio *hio; 134 unsigned int ii; 135 136 /* 137 * Initialize lists, their locks and theirs condition variables. 138 */ 139 TAILQ_INIT(&hio_free_list); 140 mtx_init(&hio_free_list_lock); 141 cv_init(&hio_free_list_cond); 142 TAILQ_INIT(&hio_disk_list); 143 mtx_init(&hio_disk_list_lock); 144 cv_init(&hio_disk_list_cond); 145 TAILQ_INIT(&hio_send_list); 146 mtx_init(&hio_send_list_lock); 147 cv_init(&hio_send_list_cond); 148 149 /* 150 * Allocate requests pool and initialize requests. 151 */ 152 for (ii = 0; ii < HAST_HIO_MAX; ii++) { 153 hio = malloc(sizeof(*hio)); 154 if (hio == NULL) { 155 pjdlog_exitx(EX_TEMPFAIL, 156 "Unable to allocate memory (%zu bytes) for hio request.", 157 sizeof(*hio)); 158 } 159 hio->hio_error = 0; 160 hio->hio_data = malloc(MAXPHYS); 161 if (hio->hio_data == NULL) { 162 pjdlog_exitx(EX_TEMPFAIL, 163 "Unable to allocate memory (%zu bytes) for gctl_data.", 164 (size_t)MAXPHYS); 165 } 166 TAILQ_INSERT_HEAD(&hio_free_list, hio, hio_next); 167 } 168} 169 170static void 171init_local(struct hast_resource *res) 172{ 173 174 if (metadata_read(res, true) < 0) 175 exit(EX_NOINPUT); 176} 177 178static void 179init_remote(struct hast_resource *res, struct nv *nvin) 180{ 181 uint64_t resuid; 182 struct nv *nvout; 183 unsigned char *map; 184 size_t mapsize; 185 186 /* Setup direction. */ 187 if (proto_send(res->hr_remoteout, NULL, 0) == -1) 188 pjdlog_errno(LOG_WARNING, "Unable to set connection direction"); 189 190 map = NULL; 191 mapsize = 0; 192 nvout = nv_alloc(); 193 nv_add_int64(nvout, (int64_t)res->hr_datasize, "datasize"); 194 nv_add_int32(nvout, (int32_t)res->hr_extentsize, "extentsize"); 195 resuid = nv_get_uint64(nvin, "resuid"); 196 res->hr_primary_localcnt = nv_get_uint64(nvin, "localcnt"); 197 res->hr_primary_remotecnt = nv_get_uint64(nvin, "remotecnt"); 198 nv_add_uint64(nvout, res->hr_secondary_localcnt, "localcnt"); 199 nv_add_uint64(nvout, res->hr_secondary_remotecnt, "remotecnt"); 200 mapsize = activemap_calc_ondisk_size(res->hr_local_mediasize - 201 METADATA_SIZE, res->hr_extentsize, res->hr_local_sectorsize); 202 map = malloc(mapsize); 203 if (map == NULL) { 204 pjdlog_exitx(EX_TEMPFAIL, 205 "Unable to allocate memory (%zu bytes) for activemap.", 206 mapsize); 207 } 208 /* 209 * When we work as primary and secondary is missing we will increase 210 * localcnt in our metadata. When secondary is connected and synced 211 * we make localcnt be equal to remotecnt, which means nodes are more 212 * or less in sync. 213 * Split-brain condition is when both nodes are not able to communicate 214 * and are both configured as primary nodes. In turn, they can both 215 * make incompatible changes to the data and we have to detect that. 216 * Under split-brain condition we will increase our localcnt on first 217 * write and remote node will increase its localcnt on first write. 218 * When we connect we can see that primary's localcnt is greater than 219 * our remotecnt (primary was modified while we weren't watching) and 220 * our localcnt is greater than primary's remotecnt (we were modified 221 * while primary wasn't watching). 222 * There are many possible combinations which are all gathered below. 223 * Don't pay too much attention to exact numbers, the more important 224 * is to compare them. We compare secondary's local with primary's 225 * remote and secondary's remote with primary's local. 226 * Note that every case where primary's localcnt is smaller than 227 * secondary's remotecnt and where secondary's localcnt is smaller than 228 * primary's remotecnt should be impossible in practise. We will perform 229 * full synchronization then. Those cases are marked with an asterisk. 230 * Regular synchronization means that only extents marked as dirty are 231 * synchronized (regular synchronization). 232 * 233 * SECONDARY METADATA PRIMARY METADATA 234 * local=3 remote=3 local=2 remote=2* ?! Full sync from secondary. 235 * local=3 remote=3 local=2 remote=3* ?! Full sync from primary. 236 * local=3 remote=3 local=2 remote=4* ?! Full sync from primary. 237 * local=3 remote=3 local=3 remote=2 Primary is out-of-date, 238 * regular sync from secondary. 239 * local=3 remote=3 local=3 remote=3 Regular sync just in case. 240 * local=3 remote=3 local=3 remote=4* ?! Full sync from primary. 241 * local=3 remote=3 local=4 remote=2 Split-brain condition. 242 * local=3 remote=3 local=4 remote=3 Secondary out-of-date, 243 * regular sync from primary. 244 * local=3 remote=3 local=4 remote=4* ?! Full sync from primary. 245 */ 246 if (res->hr_resuid == 0) { 247 /* 248 * Provider is used for the first time. If primary node done no 249 * writes yet as well (we will find "virgin" argument) then 250 * there is no need to synchronize anything. If primary node 251 * done any writes already we have to synchronize everything. 252 */ 253 PJDLOG_ASSERT(res->hr_secondary_localcnt == 0); 254 res->hr_resuid = resuid; 255 if (metadata_write(res) < 0) 256 exit(EX_NOINPUT); 257 if (nv_exists(nvin, "virgin")) { 258 free(map); 259 map = NULL; 260 mapsize = 0; 261 } else { 262 memset(map, 0xff, mapsize); 263 } 264 nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 265 } else if (res->hr_resuid != resuid) { 266 char errmsg[256]; 267 268 (void)snprintf(errmsg, sizeof(errmsg), 269 "Resource unique ID mismatch (primary=%ju, secondary=%ju).", 270 (uintmax_t)resuid, (uintmax_t)res->hr_resuid); 271 pjdlog_error("%s", errmsg); 272 nv_add_string(nvout, errmsg, "errmsg"); 273 if (hast_proto_send(res, res->hr_remotein, nvout, NULL, 0) < 0) { 274 pjdlog_exit(EX_TEMPFAIL, "Unable to send response to %s", 275 res->hr_remoteaddr); 276 } 277 nv_free(nvout); 278 exit(EX_CONFIG); 279 } else if ( 280 /* Is primary is out-of-date? */ 281 (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 282 res->hr_secondary_remotecnt == res->hr_primary_localcnt) || 283 /* Nodes are more or less in sync? */ 284 (res->hr_secondary_localcnt == res->hr_primary_remotecnt && 285 res->hr_secondary_remotecnt == res->hr_primary_localcnt) || 286 /* Is secondary is out-of-date? */ 287 (res->hr_secondary_localcnt == res->hr_primary_remotecnt && 288 res->hr_secondary_remotecnt < res->hr_primary_localcnt)) { 289 /* 290 * Nodes are more or less in sync or one of the nodes is 291 * out-of-date. 292 * It doesn't matter at this point which one, we just have to 293 * send out local bitmap to the remote node. 294 */ 295 if (pread(res->hr_localfd, map, mapsize, METADATA_SIZE) != 296 (ssize_t)mapsize) { 297 pjdlog_exit(LOG_ERR, "Unable to read activemap"); 298 } 299 if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 300 res->hr_secondary_remotecnt == res->hr_primary_localcnt) { 301 /* Primary is out-of-date, sync from secondary. */ 302 nv_add_uint8(nvout, HAST_SYNCSRC_SECONDARY, "syncsrc"); 303 } else { 304 /* 305 * Secondary is out-of-date or counts match. 306 * Sync from primary. 307 */ 308 nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 309 } 310 } else if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 311 res->hr_primary_localcnt > res->hr_secondary_remotecnt) { 312 /* 313 * Not good, we have split-brain condition. 314 */ 315 pjdlog_error("Split-brain detected, exiting."); 316 nv_add_string(nvout, "Split-brain condition!", "errmsg"); 317 free(map); 318 map = NULL; 319 mapsize = 0; 320 } else /* if (res->hr_secondary_localcnt < res->hr_primary_remotecnt || 321 res->hr_primary_localcnt < res->hr_secondary_remotecnt) */ { 322 /* 323 * This should never happen in practise, but we will perform 324 * full synchronization. 325 */ 326 PJDLOG_ASSERT(res->hr_secondary_localcnt < res->hr_primary_remotecnt || 327 res->hr_primary_localcnt < res->hr_secondary_remotecnt); 328 mapsize = activemap_calc_ondisk_size(res->hr_local_mediasize - 329 METADATA_SIZE, res->hr_extentsize, 330 res->hr_local_sectorsize); 331 memset(map, 0xff, mapsize); 332 if (res->hr_secondary_localcnt > res->hr_primary_remotecnt) { 333 /* In this one of five cases sync from secondary. */ 334 nv_add_uint8(nvout, HAST_SYNCSRC_SECONDARY, "syncsrc"); 335 } else { 336 /* For the rest four cases sync from primary. */ 337 nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 338 } 339 pjdlog_warning("This should never happen, asking for full synchronization (primary(local=%ju, remote=%ju), secondary(local=%ju, remote=%ju)).", 340 (uintmax_t)res->hr_primary_localcnt, 341 (uintmax_t)res->hr_primary_remotecnt, 342 (uintmax_t)res->hr_secondary_localcnt, 343 (uintmax_t)res->hr_secondary_remotecnt); 344 } 345 nv_add_uint32(nvout, (uint32_t)mapsize, "mapsize"); 346 if (hast_proto_send(res, res->hr_remotein, nvout, map, mapsize) < 0) { 347 pjdlog_exit(EX_TEMPFAIL, "Unable to send activemap to %s", 348 res->hr_remoteaddr); 349 } 350 if (map != NULL) 351 free(map); 352 nv_free(nvout); 353 /* Setup direction. */ 354 if (proto_recv(res->hr_remotein, NULL, 0) == -1) 355 pjdlog_errno(LOG_WARNING, "Unable to set connection direction"); 356 if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 357 res->hr_primary_localcnt > res->hr_secondary_remotecnt) { 358 /* Exit on split-brain. */ 359 event_send(res, EVENT_SPLITBRAIN); 360 exit(EX_CONFIG); 361 } 362} 363 364void 365hastd_secondary(struct hast_resource *res, struct nv *nvin) 366{ 367 sigset_t mask; 368 pthread_t td; 369 pid_t pid; 370 int error, mode, debuglevel; 371 372 /* 373 * Create communication channel between parent and child. 374 */ 375 if (proto_client(NULL, "socketpair://", &res->hr_ctrl) < 0) { 376 KEEP_ERRNO((void)pidfile_remove(pfh)); 377 pjdlog_exit(EX_OSERR, 378 "Unable to create control sockets between parent and child"); 379 } 380 /* 381 * Create communication channel between child and parent. 382 */ 383 if (proto_client(NULL, "socketpair://", &res->hr_event) < 0) { 384 KEEP_ERRNO((void)pidfile_remove(pfh)); 385 pjdlog_exit(EX_OSERR, 386 "Unable to create event sockets between child and parent"); 387 } 388 389 pid = fork(); 390 if (pid < 0) { 391 KEEP_ERRNO((void)pidfile_remove(pfh)); 392 pjdlog_exit(EX_OSERR, "Unable to fork"); 393 } 394 395 if (pid > 0) { 396 /* This is parent. */ 397 proto_close(res->hr_remotein); 398 res->hr_remotein = NULL; 399 proto_close(res->hr_remoteout); 400 res->hr_remoteout = NULL; 401 /* Declare that we are receiver. */ 402 proto_recv(res->hr_event, NULL, 0); 403 /* Declare that we are sender. */ 404 proto_send(res->hr_ctrl, NULL, 0); 405 res->hr_workerpid = pid; 406 return; 407 } 408 409 gres = res; 410 mode = pjdlog_mode_get(); 411 debuglevel = pjdlog_debug_get(); 412 413 /* Declare that we are sender. */ 414 proto_send(res->hr_event, NULL, 0); 415 /* Declare that we are receiver. */ 416 proto_recv(res->hr_ctrl, NULL, 0); 417 descriptors_cleanup(res); 418 419 descriptors_assert(res, mode); 420 421 pjdlog_init(mode); 422 pjdlog_debug_set(debuglevel); 423 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 424 setproctitle("%s (%s)", res->hr_name, role2str(res->hr_role)); 425 426 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 427 PJDLOG_VERIFY(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); 428 429 /* Error in setting timeout is not critical, but why should it fail? */ 430 if (proto_timeout(res->hr_remotein, 2 * HAST_KEEPALIVE) < 0) 431 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 432 if (proto_timeout(res->hr_remoteout, res->hr_timeout) < 0) 433 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 434 435 init_local(res); 436 init_environment(); 437 438 if (drop_privs(true) != 0) 439 exit(EX_CONFIG); 440 pjdlog_info("Privileges successfully dropped."); 441 442 /* 443 * Create the control thread before sending any event to the parent, 444 * as we can deadlock when parent sends control request to worker, 445 * but worker has no control thread started yet, so parent waits. 446 * In the meantime worker sends an event to the parent, but parent 447 * is unable to handle the event, because it waits for control 448 * request response. 449 */ 450 error = pthread_create(&td, NULL, ctrl_thread, res); 451 PJDLOG_ASSERT(error == 0); 452 453 init_remote(res, nvin); 454 event_send(res, EVENT_CONNECT); 455 456 error = pthread_create(&td, NULL, recv_thread, res); 457 PJDLOG_ASSERT(error == 0); 458 error = pthread_create(&td, NULL, disk_thread, res); 459 PJDLOG_ASSERT(error == 0); 460 (void)send_thread(res); 461} 462 463static void 464reqlog(int loglevel, int debuglevel, int error, struct hio *hio, const char *fmt, ...) 465{ 466 char msg[1024]; 467 va_list ap; 468 int len; 469 470 va_start(ap, fmt); 471 len = vsnprintf(msg, sizeof(msg), fmt, ap); 472 va_end(ap); 473 if ((size_t)len < sizeof(msg)) { 474 switch (hio->hio_cmd) { 475 case HIO_READ: 476 (void)snprintf(msg + len, sizeof(msg) - len, 477 "READ(%ju, %ju).", (uintmax_t)hio->hio_offset, 478 (uintmax_t)hio->hio_length); 479 break; 480 case HIO_DELETE: 481 (void)snprintf(msg + len, sizeof(msg) - len, 482 "DELETE(%ju, %ju).", (uintmax_t)hio->hio_offset, 483 (uintmax_t)hio->hio_length); 484 break; 485 case HIO_FLUSH: 486 (void)snprintf(msg + len, sizeof(msg) - len, "FLUSH."); 487 break; 488 case HIO_WRITE: 489 (void)snprintf(msg + len, sizeof(msg) - len, 490 "WRITE(%ju, %ju).", (uintmax_t)hio->hio_offset, 491 (uintmax_t)hio->hio_length); 492 break; 493 case HIO_KEEPALIVE: 494 (void)snprintf(msg + len, sizeof(msg) - len, "KEEPALIVE."); 495 break; 496 default: 497 (void)snprintf(msg + len, sizeof(msg) - len, 498 "UNKNOWN(%u).", (unsigned int)hio->hio_cmd); 499 break; 500 } 501 } 502 pjdlog_common(loglevel, debuglevel, error, "%s", msg); 503} 504 505static int 506requnpack(struct hast_resource *res, struct hio *hio) 507{ 508 509 hio->hio_cmd = nv_get_uint8(hio->hio_nv, "cmd"); 510 if (hio->hio_cmd == 0) { 511 pjdlog_error("Header contains no 'cmd' field."); 512 hio->hio_error = EINVAL; 513 goto end; 514 } 515 switch (hio->hio_cmd) { 516 case HIO_KEEPALIVE: 517 break; 518 case HIO_READ: 519 case HIO_WRITE: 520 case HIO_DELETE: 521 hio->hio_offset = nv_get_uint64(hio->hio_nv, "offset"); 522 if (nv_error(hio->hio_nv) != 0) { 523 pjdlog_error("Header is missing 'offset' field."); 524 hio->hio_error = EINVAL; 525 goto end; 526 } 527 hio->hio_length = nv_get_uint64(hio->hio_nv, "length"); 528 if (nv_error(hio->hio_nv) != 0) { 529 pjdlog_error("Header is missing 'length' field."); 530 hio->hio_error = EINVAL; 531 goto end; 532 } 533 if (hio->hio_length == 0) { 534 pjdlog_error("Data length is zero."); 535 hio->hio_error = EINVAL; 536 goto end; 537 } 538 if (hio->hio_length > MAXPHYS) { 539 pjdlog_error("Data length is too large (%ju > %ju).", 540 (uintmax_t)hio->hio_length, (uintmax_t)MAXPHYS); 541 hio->hio_error = EINVAL; 542 goto end; 543 } 544 if ((hio->hio_offset % res->hr_local_sectorsize) != 0) { 545 pjdlog_error("Offset %ju is not multiple of sector size.", 546 (uintmax_t)hio->hio_offset); 547 hio->hio_error = EINVAL; 548 goto end; 549 } 550 if ((hio->hio_length % res->hr_local_sectorsize) != 0) { 551 pjdlog_error("Length %ju is not multiple of sector size.", 552 (uintmax_t)hio->hio_length); 553 hio->hio_error = EINVAL; 554 goto end; 555 } 556 if (hio->hio_offset + hio->hio_length > 557 (uint64_t)res->hr_datasize) { 558 pjdlog_error("Data offset is too large (%ju > %ju).", 559 (uintmax_t)(hio->hio_offset + hio->hio_length), 560 (uintmax_t)res->hr_datasize); 561 hio->hio_error = EINVAL; 562 goto end; 563 } 564 break; 565 default: 566 pjdlog_error("Header contains invalid 'cmd' (%hhu).", 567 hio->hio_cmd); 568 hio->hio_error = EINVAL; 569 goto end; 570 } 571 hio->hio_error = 0; 572end: 573 return (hio->hio_error); 574} 575 576static __dead2 void 577secondary_exit(int exitcode, const char *fmt, ...) 578{ 579 va_list ap; 580 581 PJDLOG_ASSERT(exitcode != EX_OK); 582 va_start(ap, fmt); 583 pjdlogv_errno(LOG_ERR, fmt, ap); 584 va_end(ap); 585 event_send(gres, EVENT_DISCONNECT); 586 exit(exitcode); 587} 588 589/* 590 * Thread receives requests from the primary node. 591 */ 592static void * 593recv_thread(void *arg) 594{ 595 struct hast_resource *res = arg; 596 struct hio *hio; 597 598 for (;;) { 599 pjdlog_debug(2, "recv: Taking free request."); 600 QUEUE_TAKE(free, hio); 601 pjdlog_debug(2, "recv: (%p) Got request.", hio); 602 if (hast_proto_recv_hdr(res->hr_remotein, &hio->hio_nv) < 0) { 603 secondary_exit(EX_TEMPFAIL, 604 "Unable to receive request header"); 605 } 606 if (requnpack(res, hio) != 0) { 607 pjdlog_debug(2, 608 "recv: (%p) Moving request to the send queue.", 609 hio); 610 QUEUE_INSERT(send, hio); 611 continue; 612 } 613 reqlog(LOG_DEBUG, 2, -1, hio, 614 "recv: (%p) Got request header: ", hio); 615 if (hio->hio_cmd == HIO_KEEPALIVE) { 616 pjdlog_debug(2, 617 "recv: (%p) Moving request to the free queue.", 618 hio); 619 nv_free(hio->hio_nv); 620 QUEUE_INSERT(free, hio); 621 continue; 622 } else if (hio->hio_cmd == HIO_WRITE) { 623 if (hast_proto_recv_data(res, res->hr_remotein, 624 hio->hio_nv, hio->hio_data, MAXPHYS) < 0) { 625 secondary_exit(EX_TEMPFAIL, 626 "Unable to receive request data"); 627 } 628 } 629 pjdlog_debug(2, "recv: (%p) Moving request to the disk queue.", 630 hio); 631 QUEUE_INSERT(disk, hio); 632 } 633 /* NOTREACHED */ 634 return (NULL); 635} 636 637/* 638 * Thread reads from or writes to local component and also handles DELETE and 639 * FLUSH requests. 640 */ 641static void * 642disk_thread(void *arg) 643{ 644 struct hast_resource *res = arg; 645 struct hio *hio; 646 ssize_t ret; 647 bool clear_activemap; 648 649 clear_activemap = true; 650 651 for (;;) { 652 pjdlog_debug(2, "disk: Taking request."); 653 QUEUE_TAKE(disk, hio); 654 while (clear_activemap) { 655 unsigned char *map; 656 size_t mapsize; 657 658 /* 659 * When first request is received, it means that primary 660 * already received our activemap, merged it and stored 661 * locally. We can now safely clear our activemap. 662 */ 663 mapsize = 664 activemap_calc_ondisk_size(res->hr_local_mediasize - 665 METADATA_SIZE, res->hr_extentsize, 666 res->hr_local_sectorsize); 667 map = calloc(1, mapsize); 668 if (map == NULL) { 669 pjdlog_warning("Unable to allocate memory to clear local activemap."); 670 break; 671 } 672 if (pwrite(res->hr_localfd, map, mapsize, 673 METADATA_SIZE) != (ssize_t)mapsize) { 674 pjdlog_errno(LOG_WARNING, 675 "Unable to store cleared activemap"); 676 free(map); 677 break; 678 } 679 free(map); 680 clear_activemap = false; 681 pjdlog_debug(1, "Local activemap cleared."); 682 } 683 reqlog(LOG_DEBUG, 2, -1, hio, "disk: (%p) Got request: ", hio); 684 /* Handle the actual request. */ 685 switch (hio->hio_cmd) { 686 case HIO_READ: 687 ret = pread(res->hr_localfd, hio->hio_data, 688 hio->hio_length, 689 hio->hio_offset + res->hr_localoff); 690 if (ret < 0) 691 hio->hio_error = errno; 692 else if (ret != (int64_t)hio->hio_length) 693 hio->hio_error = EIO; 694 else 695 hio->hio_error = 0; 696 break; 697 case HIO_WRITE: 698 ret = pwrite(res->hr_localfd, hio->hio_data, 699 hio->hio_length, 700 hio->hio_offset + res->hr_localoff); 701 if (ret < 0) 702 hio->hio_error = errno; 703 else if (ret != (int64_t)hio->hio_length) 704 hio->hio_error = EIO; 705 else 706 hio->hio_error = 0; 707 break; 708 case HIO_DELETE: 709 ret = g_delete(res->hr_localfd, 710 hio->hio_offset + res->hr_localoff, 711 hio->hio_length); 712 if (ret < 0) 713 hio->hio_error = errno; 714 else 715 hio->hio_error = 0; 716 break; 717 case HIO_FLUSH: 718 ret = g_flush(res->hr_localfd); 719 if (ret < 0) 720 hio->hio_error = errno; 721 else 722 hio->hio_error = 0; 723 break; 724 } 725 if (hio->hio_error != 0) { 726 reqlog(LOG_ERR, 0, hio->hio_error, hio, 727 "Request failed: "); 728 } 729 pjdlog_debug(2, "disk: (%p) Moving request to the send queue.", 730 hio); 731 QUEUE_INSERT(send, hio); 732 } 733 /* NOTREACHED */ 734 return (NULL); 735} 736 737/* 738 * Thread sends requests back to primary node. 739 */ 740static void * 741send_thread(void *arg) 742{ 743 struct hast_resource *res = arg; 744 struct nv *nvout; 745 struct hio *hio; 746 void *data; 747 size_t length; 748 749 for (;;) { 750 pjdlog_debug(2, "send: Taking request."); 751 QUEUE_TAKE(send, hio); 752 reqlog(LOG_DEBUG, 2, -1, hio, "send: (%p) Got request: ", hio); 753 nvout = nv_alloc(); 754 /* Copy sequence number. */ 755 nv_add_uint64(nvout, nv_get_uint64(hio->hio_nv, "seq"), "seq"); 756 switch (hio->hio_cmd) { 757 case HIO_READ: 758 if (hio->hio_error == 0) { 759 data = hio->hio_data; 760 length = hio->hio_length; 761 break; 762 } 763 /* 764 * We send no data in case of an error. 765 */ 766 /* FALLTHROUGH */ 767 case HIO_DELETE: 768 case HIO_FLUSH: 769 case HIO_WRITE: 770 data = NULL; 771 length = 0; 772 break; 773 default: 774 abort(); 775 break; 776 } 777 if (hio->hio_error != 0) 778 nv_add_int16(nvout, hio->hio_error, "error"); 779 if (hast_proto_send(res, res->hr_remoteout, nvout, data, 780 length) < 0) { 781 secondary_exit(EX_TEMPFAIL, "Unable to send reply."); 782 } 783 nv_free(nvout); 784 pjdlog_debug(2, "send: (%p) Moving request to the free queue.", 785 hio); 786 nv_free(hio->hio_nv); 787 hio->hio_error = 0; 788 QUEUE_INSERT(free, hio); 789 } 790 /* NOTREACHED */ 791 return (NULL); 792} 793