secondary.c revision 220005
1204076Spjd/*- 2204076Spjd * Copyright (c) 2009-2010 The FreeBSD Foundation 3211877Spjd * Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 4204076Spjd * All rights reserved. 5204076Spjd * 6204076Spjd * This software was developed by Pawel Jakub Dawidek under sponsorship from 7204076Spjd * the FreeBSD Foundation. 8204076Spjd * 9204076Spjd * Redistribution and use in source and binary forms, with or without 10204076Spjd * modification, are permitted provided that the following conditions 11204076Spjd * are met: 12204076Spjd * 1. Redistributions of source code must retain the above copyright 13204076Spjd * notice, this list of conditions and the following disclaimer. 14204076Spjd * 2. Redistributions in binary form must reproduce the above copyright 15204076Spjd * notice, this list of conditions and the following disclaimer in the 16204076Spjd * documentation and/or other materials provided with the distribution. 17204076Spjd * 18204076Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 19204076Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20204076Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21204076Spjd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 22204076Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23204076Spjd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24204076Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25204076Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26204076Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27204076Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28204076Spjd * SUCH DAMAGE. 29204076Spjd */ 30204076Spjd 31204076Spjd#include <sys/cdefs.h> 32204076Spjd__FBSDID("$FreeBSD: head/sbin/hastd/secondary.c 220005 2011-03-25 20:13:38Z pjd $"); 33204076Spjd 34204076Spjd#include <sys/param.h> 35204076Spjd#include <sys/time.h> 36204076Spjd#include <sys/bio.h> 37204076Spjd#include <sys/disk.h> 38204076Spjd#include <sys/stat.h> 39204076Spjd 40204076Spjd#include <err.h> 41204076Spjd#include <errno.h> 42204076Spjd#include <fcntl.h> 43204076Spjd#include <libgeom.h> 44204076Spjd#include <pthread.h> 45213009Spjd#include <signal.h> 46204076Spjd#include <stdint.h> 47204076Spjd#include <stdio.h> 48204076Spjd#include <string.h> 49204076Spjd#include <sysexits.h> 50204076Spjd#include <unistd.h> 51204076Spjd 52204076Spjd#include <activemap.h> 53204076Spjd#include <nv.h> 54204076Spjd#include <pjdlog.h> 55204076Spjd 56204076Spjd#include "control.h" 57212038Spjd#include "event.h" 58204076Spjd#include "hast.h" 59204076Spjd#include "hast_proto.h" 60204076Spjd#include "hastd.h" 61211977Spjd#include "hooks.h" 62204076Spjd#include "metadata.h" 63204076Spjd#include "proto.h" 64204076Spjd#include "subr.h" 65204076Spjd#include "synch.h" 66204076Spjd 67204076Spjdstruct hio { 68219864Spjd uint64_t hio_seq; 69219864Spjd int hio_error; 70204076Spjd struct nv *hio_nv; 71204076Spjd void *hio_data; 72204076Spjd uint8_t hio_cmd; 73204076Spjd uint64_t hio_offset; 74204076Spjd uint64_t hio_length; 75204076Spjd TAILQ_ENTRY(hio) hio_next; 76204076Spjd}; 77204076Spjd 78211984Spjdstatic struct hast_resource *gres; 79211984Spjd 80204076Spjd/* 81204076Spjd * Free list holds unused structures. When free list is empty, we have to wait 82204076Spjd * until some in-progress requests are freed. 83204076Spjd */ 84204076Spjdstatic TAILQ_HEAD(, hio) hio_free_list; 85204076Spjdstatic pthread_mutex_t hio_free_list_lock; 86204076Spjdstatic pthread_cond_t hio_free_list_cond; 87204076Spjd/* 88204076Spjd * Disk thread (the one that do I/O requests) takes requests from this list. 89204076Spjd */ 90204076Spjdstatic TAILQ_HEAD(, hio) hio_disk_list; 91204076Spjdstatic pthread_mutex_t hio_disk_list_lock; 92204076Spjdstatic pthread_cond_t hio_disk_list_cond; 93204076Spjd/* 94204076Spjd * There is one recv list for every component, although local components don't 95204076Spjd * use recv lists as local requests are done synchronously. 96204076Spjd */ 97204076Spjdstatic TAILQ_HEAD(, hio) hio_send_list; 98204076Spjdstatic pthread_mutex_t hio_send_list_lock; 99204076Spjdstatic pthread_cond_t hio_send_list_cond; 100204076Spjd 101204076Spjd/* 102204076Spjd * Maximum number of outstanding I/O requests. 103204076Spjd */ 104204076Spjd#define HAST_HIO_MAX 256 105204076Spjd 106204076Spjdstatic void *recv_thread(void *arg); 107204076Spjdstatic void *disk_thread(void *arg); 108204076Spjdstatic void *send_thread(void *arg); 109204076Spjd 110211877Spjd#define QUEUE_INSERT(name, hio) do { \ 111211877Spjd bool _wakeup; \ 112211877Spjd \ 113211877Spjd mtx_lock(&hio_##name##_list_lock); \ 114211877Spjd _wakeup = TAILQ_EMPTY(&hio_##name##_list); \ 115211877Spjd TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_next); \ 116211877Spjd mtx_unlock(&hio_##name##_list_lock); \ 117211877Spjd if (_wakeup) \ 118211877Spjd cv_signal(&hio_##name##_list_cond); \ 119211877Spjd} while (0) 120211877Spjd#define QUEUE_TAKE(name, hio) do { \ 121211877Spjd mtx_lock(&hio_##name##_list_lock); \ 122211877Spjd while (((hio) = TAILQ_FIRST(&hio_##name##_list)) == NULL) { \ 123211877Spjd cv_wait(&hio_##name##_list_cond, \ 124211877Spjd &hio_##name##_list_lock); \ 125211877Spjd } \ 126211877Spjd TAILQ_REMOVE(&hio_##name##_list, (hio), hio_next); \ 127211877Spjd mtx_unlock(&hio_##name##_list_lock); \ 128211877Spjd} while (0) 129211877Spjd 130204076Spjdstatic void 131204076Spjdinit_environment(void) 132204076Spjd{ 133204076Spjd struct hio *hio; 134204076Spjd unsigned int ii; 135204076Spjd 136204076Spjd /* 137204076Spjd * Initialize lists, their locks and theirs condition variables. 138204076Spjd */ 139204076Spjd TAILQ_INIT(&hio_free_list); 140204076Spjd mtx_init(&hio_free_list_lock); 141204076Spjd cv_init(&hio_free_list_cond); 142204076Spjd TAILQ_INIT(&hio_disk_list); 143204076Spjd mtx_init(&hio_disk_list_lock); 144204076Spjd cv_init(&hio_disk_list_cond); 145204076Spjd TAILQ_INIT(&hio_send_list); 146204076Spjd mtx_init(&hio_send_list_lock); 147204076Spjd cv_init(&hio_send_list_cond); 148204076Spjd 149204076Spjd /* 150204076Spjd * Allocate requests pool and initialize requests. 151204076Spjd */ 152204076Spjd for (ii = 0; ii < HAST_HIO_MAX; ii++) { 153204076Spjd hio = malloc(sizeof(*hio)); 154204076Spjd if (hio == NULL) { 155210879Spjd pjdlog_exitx(EX_TEMPFAIL, 156210879Spjd "Unable to allocate memory (%zu bytes) for hio request.", 157210879Spjd sizeof(*hio)); 158204076Spjd } 159204076Spjd hio->hio_error = 0; 160204076Spjd hio->hio_data = malloc(MAXPHYS); 161204076Spjd if (hio->hio_data == NULL) { 162210879Spjd pjdlog_exitx(EX_TEMPFAIL, 163210879Spjd "Unable to allocate memory (%zu bytes) for gctl_data.", 164210879Spjd (size_t)MAXPHYS); 165204076Spjd } 166204076Spjd TAILQ_INSERT_HEAD(&hio_free_list, hio, hio_next); 167204076Spjd } 168204076Spjd} 169204076Spjd 170204076Spjdstatic void 171204076Spjdinit_local(struct hast_resource *res) 172204076Spjd{ 173204076Spjd 174204076Spjd if (metadata_read(res, true) < 0) 175204076Spjd exit(EX_NOINPUT); 176204076Spjd} 177204076Spjd 178204076Spjdstatic void 179204076Spjdinit_remote(struct hast_resource *res, struct nv *nvin) 180204076Spjd{ 181204076Spjd uint64_t resuid; 182204076Spjd struct nv *nvout; 183204076Spjd unsigned char *map; 184204076Spjd size_t mapsize; 185204076Spjd 186204076Spjd map = NULL; 187204076Spjd mapsize = 0; 188204076Spjd nvout = nv_alloc(); 189204076Spjd nv_add_int64(nvout, (int64_t)res->hr_datasize, "datasize"); 190204076Spjd nv_add_int32(nvout, (int32_t)res->hr_extentsize, "extentsize"); 191204076Spjd resuid = nv_get_uint64(nvin, "resuid"); 192204076Spjd res->hr_primary_localcnt = nv_get_uint64(nvin, "localcnt"); 193204076Spjd res->hr_primary_remotecnt = nv_get_uint64(nvin, "remotecnt"); 194204076Spjd nv_add_uint64(nvout, res->hr_secondary_localcnt, "localcnt"); 195204076Spjd nv_add_uint64(nvout, res->hr_secondary_remotecnt, "remotecnt"); 196204076Spjd mapsize = activemap_calc_ondisk_size(res->hr_local_mediasize - 197204076Spjd METADATA_SIZE, res->hr_extentsize, res->hr_local_sectorsize); 198204076Spjd map = malloc(mapsize); 199204076Spjd if (map == NULL) { 200204076Spjd pjdlog_exitx(EX_TEMPFAIL, 201204076Spjd "Unable to allocate memory (%zu bytes) for activemap.", 202204076Spjd mapsize); 203204076Spjd } 204204076Spjd nv_add_uint32(nvout, (uint32_t)mapsize, "mapsize"); 205204076Spjd /* 206204076Spjd * When we work as primary and secondary is missing we will increase 207204076Spjd * localcnt in our metadata. When secondary is connected and synced 208204076Spjd * we make localcnt be equal to remotecnt, which means nodes are more 209204076Spjd * or less in sync. 210204076Spjd * Split-brain condition is when both nodes are not able to communicate 211204076Spjd * and are both configured as primary nodes. In turn, they can both 212204076Spjd * make incompatible changes to the data and we have to detect that. 213204076Spjd * Under split-brain condition we will increase our localcnt on first 214204076Spjd * write and remote node will increase its localcnt on first write. 215204076Spjd * When we connect we can see that primary's localcnt is greater than 216204076Spjd * our remotecnt (primary was modified while we weren't watching) and 217204076Spjd * our localcnt is greater than primary's remotecnt (we were modified 218204076Spjd * while primary wasn't watching). 219204076Spjd * There are many possible combinations which are all gathered below. 220204076Spjd * Don't pay too much attention to exact numbers, the more important 221204076Spjd * is to compare them. We compare secondary's local with primary's 222204076Spjd * remote and secondary's remote with primary's local. 223204076Spjd * Note that every case where primary's localcnt is smaller than 224204076Spjd * secondary's remotecnt and where secondary's localcnt is smaller than 225204076Spjd * primary's remotecnt should be impossible in practise. We will perform 226204076Spjd * full synchronization then. Those cases are marked with an asterisk. 227204076Spjd * Regular synchronization means that only extents marked as dirty are 228204076Spjd * synchronized (regular synchronization). 229204076Spjd * 230204076Spjd * SECONDARY METADATA PRIMARY METADATA 231204076Spjd * local=3 remote=3 local=2 remote=2* ?! Full sync from secondary. 232204076Spjd * local=3 remote=3 local=2 remote=3* ?! Full sync from primary. 233204076Spjd * local=3 remote=3 local=2 remote=4* ?! Full sync from primary. 234204076Spjd * local=3 remote=3 local=3 remote=2 Primary is out-of-date, 235204076Spjd * regular sync from secondary. 236204076Spjd * local=3 remote=3 local=3 remote=3 Regular sync just in case. 237204076Spjd * local=3 remote=3 local=3 remote=4* ?! Full sync from primary. 238204076Spjd * local=3 remote=3 local=4 remote=2 Split-brain condition. 239204076Spjd * local=3 remote=3 local=4 remote=3 Secondary out-of-date, 240204076Spjd * regular sync from primary. 241204076Spjd * local=3 remote=3 local=4 remote=4* ?! Full sync from primary. 242204076Spjd */ 243204076Spjd if (res->hr_resuid == 0) { 244204076Spjd /* 245214284Spjd * Provider is used for the first time. If primary node done no 246214284Spjd * writes yet as well (we will find "virgin" argument) then 247214284Spjd * there is no need to synchronize anything. If primary node 248214284Spjd * done any writes already we have to synchronize everything. 249204076Spjd */ 250218138Spjd PJDLOG_ASSERT(res->hr_secondary_localcnt == 0); 251204076Spjd res->hr_resuid = resuid; 252204076Spjd if (metadata_write(res) < 0) 253204076Spjd exit(EX_NOINPUT); 254214284Spjd if (nv_exists(nvin, "virgin")) { 255214284Spjd free(map); 256214284Spjd map = NULL; 257214284Spjd mapsize = 0; 258214284Spjd } else { 259214284Spjd memset(map, 0xff, mapsize); 260214284Spjd } 261204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 262219830Spjd } else if (res->hr_resuid != resuid) { 263219830Spjd char errmsg[256]; 264219830Spjd 265219830Spjd (void)snprintf(errmsg, sizeof(errmsg), 266219830Spjd "Resource unique ID mismatch (primary=%ju, secondary=%ju).", 267219830Spjd (uintmax_t)resuid, (uintmax_t)res->hr_resuid); 268219830Spjd pjdlog_error("%s", errmsg); 269219830Spjd nv_add_string(nvout, errmsg, "errmsg"); 270219830Spjd if (hast_proto_send(res, res->hr_remotein, nvout, NULL, 0) < 0) { 271219830Spjd pjdlog_exit(EX_TEMPFAIL, "Unable to send response to %s", 272219830Spjd res->hr_remoteaddr); 273219830Spjd } 274219831Spjd nv_free(nvout); 275219830Spjd exit(EX_CONFIG); 276204076Spjd } else if ( 277204076Spjd /* Is primary is out-of-date? */ 278204076Spjd (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 279204076Spjd res->hr_secondary_remotecnt == res->hr_primary_localcnt) || 280219843Spjd /* Nodes are more or less in sync? */ 281204076Spjd (res->hr_secondary_localcnt == res->hr_primary_remotecnt && 282204076Spjd res->hr_secondary_remotecnt == res->hr_primary_localcnt) || 283204076Spjd /* Is secondary is out-of-date? */ 284204076Spjd (res->hr_secondary_localcnt == res->hr_primary_remotecnt && 285204076Spjd res->hr_secondary_remotecnt < res->hr_primary_localcnt)) { 286204076Spjd /* 287204076Spjd * Nodes are more or less in sync or one of the nodes is 288204076Spjd * out-of-date. 289204076Spjd * It doesn't matter at this point which one, we just have to 290204076Spjd * send out local bitmap to the remote node. 291204076Spjd */ 292204076Spjd if (pread(res->hr_localfd, map, mapsize, METADATA_SIZE) != 293204076Spjd (ssize_t)mapsize) { 294204076Spjd pjdlog_exit(LOG_ERR, "Unable to read activemap"); 295204076Spjd } 296204076Spjd if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 297204076Spjd res->hr_secondary_remotecnt == res->hr_primary_localcnt) { 298204076Spjd /* Primary is out-of-date, sync from secondary. */ 299204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_SECONDARY, "syncsrc"); 300204076Spjd } else { 301204076Spjd /* 302204076Spjd * Secondary is out-of-date or counts match. 303204076Spjd * Sync from primary. 304204076Spjd */ 305204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 306204076Spjd } 307204076Spjd } else if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 308204076Spjd res->hr_primary_localcnt > res->hr_secondary_remotecnt) { 309204076Spjd /* 310204076Spjd * Not good, we have split-brain condition. 311204076Spjd */ 312204076Spjd pjdlog_error("Split-brain detected, exiting."); 313204076Spjd nv_add_string(nvout, "Split-brain condition!", "errmsg"); 314204076Spjd free(map); 315204076Spjd map = NULL; 316204076Spjd mapsize = 0; 317204076Spjd } else /* if (res->hr_secondary_localcnt < res->hr_primary_remotecnt || 318204076Spjd res->hr_primary_localcnt < res->hr_secondary_remotecnt) */ { 319204076Spjd /* 320204076Spjd * This should never happen in practise, but we will perform 321204076Spjd * full synchronization. 322204076Spjd */ 323218138Spjd PJDLOG_ASSERT(res->hr_secondary_localcnt < res->hr_primary_remotecnt || 324204076Spjd res->hr_primary_localcnt < res->hr_secondary_remotecnt); 325204076Spjd mapsize = activemap_calc_ondisk_size(res->hr_local_mediasize - 326204076Spjd METADATA_SIZE, res->hr_extentsize, 327204076Spjd res->hr_local_sectorsize); 328204076Spjd memset(map, 0xff, mapsize); 329204076Spjd if (res->hr_secondary_localcnt > res->hr_primary_remotecnt) { 330204076Spjd /* In this one of five cases sync from secondary. */ 331204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_SECONDARY, "syncsrc"); 332204076Spjd } else { 333204076Spjd /* For the rest four cases sync from primary. */ 334204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 335204076Spjd } 336204076Spjd pjdlog_warning("This should never happen, asking for full synchronization (primary(local=%ju, remote=%ju), secondary(local=%ju, remote=%ju)).", 337204076Spjd (uintmax_t)res->hr_primary_localcnt, 338204076Spjd (uintmax_t)res->hr_primary_remotecnt, 339204076Spjd (uintmax_t)res->hr_secondary_localcnt, 340204076Spjd (uintmax_t)res->hr_secondary_remotecnt); 341204076Spjd } 342204076Spjd if (hast_proto_send(res, res->hr_remotein, nvout, map, mapsize) < 0) { 343214276Spjd pjdlog_exit(EX_TEMPFAIL, "Unable to send activemap to %s", 344204076Spjd res->hr_remoteaddr); 345204076Spjd } 346214275Spjd if (map != NULL) 347214275Spjd free(map); 348209182Spjd nv_free(nvout); 349204076Spjd if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 350204076Spjd res->hr_primary_localcnt > res->hr_secondary_remotecnt) { 351204076Spjd /* Exit on split-brain. */ 352212038Spjd event_send(res, EVENT_SPLITBRAIN); 353204076Spjd exit(EX_CONFIG); 354204076Spjd } 355204076Spjd} 356204076Spjd 357204076Spjdvoid 358204076Spjdhastd_secondary(struct hast_resource *res, struct nv *nvin) 359204076Spjd{ 360213009Spjd sigset_t mask; 361204076Spjd pthread_t td; 362204076Spjd pid_t pid; 363219482Strociny int error, mode, debuglevel; 364204076Spjd 365204076Spjd /* 366204076Spjd * Create communication channel between parent and child. 367204076Spjd */ 368219818Spjd if (proto_client(NULL, "socketpair://", &res->hr_ctrl) < 0) { 369204076Spjd KEEP_ERRNO((void)pidfile_remove(pfh)); 370204076Spjd pjdlog_exit(EX_OSERR, 371204076Spjd "Unable to create control sockets between parent and child"); 372204076Spjd } 373212038Spjd /* 374212038Spjd * Create communication channel between child and parent. 375212038Spjd */ 376219818Spjd if (proto_client(NULL, "socketpair://", &res->hr_event) < 0) { 377212038Spjd KEEP_ERRNO((void)pidfile_remove(pfh)); 378212038Spjd pjdlog_exit(EX_OSERR, 379212038Spjd "Unable to create event sockets between child and parent"); 380212038Spjd } 381204076Spjd 382204076Spjd pid = fork(); 383204076Spjd if (pid < 0) { 384204076Spjd KEEP_ERRNO((void)pidfile_remove(pfh)); 385204076Spjd pjdlog_exit(EX_OSERR, "Unable to fork"); 386204076Spjd } 387204076Spjd 388204076Spjd if (pid > 0) { 389204076Spjd /* This is parent. */ 390204076Spjd proto_close(res->hr_remotein); 391204076Spjd res->hr_remotein = NULL; 392204076Spjd proto_close(res->hr_remoteout); 393204076Spjd res->hr_remoteout = NULL; 394212038Spjd /* Declare that we are receiver. */ 395212038Spjd proto_recv(res->hr_event, NULL, 0); 396218043Spjd /* Declare that we are sender. */ 397218043Spjd proto_send(res->hr_ctrl, NULL, 0); 398204076Spjd res->hr_workerpid = pid; 399204076Spjd return; 400204076Spjd } 401211977Spjd 402211984Spjd gres = res; 403218043Spjd mode = pjdlog_mode_get(); 404219482Strociny debuglevel = pjdlog_debug_get(); 405211984Spjd 406218043Spjd /* Declare that we are sender. */ 407218043Spjd proto_send(res->hr_event, NULL, 0); 408218043Spjd /* Declare that we are receiver. */ 409218043Spjd proto_recv(res->hr_ctrl, NULL, 0); 410218043Spjd descriptors_cleanup(res); 411204076Spjd 412218045Spjd descriptors_assert(res, mode); 413218045Spjd 414218043Spjd pjdlog_init(mode); 415219482Strociny pjdlog_debug_set(debuglevel); 416218043Spjd pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 417220005Spjd setproctitle("%s (%s)", res->hr_name, role2str(res->hr_role)); 418204076Spjd 419213009Spjd PJDLOG_VERIFY(sigemptyset(&mask) == 0); 420213009Spjd PJDLOG_VERIFY(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); 421210880Spjd 422207371Spjd /* Error in setting timeout is not critical, but why should it fail? */ 423219721Strociny if (proto_timeout(res->hr_remotein, 2 * HAST_KEEPALIVE) < 0) 424207371Spjd pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 425207371Spjd if (proto_timeout(res->hr_remoteout, res->hr_timeout) < 0) 426207371Spjd pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 427207371Spjd 428204076Spjd init_local(res); 429213007Spjd init_environment(); 430213007Spjd 431219847Spjd if (drop_privs(true) != 0) 432218049Spjd exit(EX_CONFIG); 433218214Spjd pjdlog_info("Privileges successfully dropped."); 434218049Spjd 435213007Spjd /* 436213007Spjd * Create the control thread before sending any event to the parent, 437213007Spjd * as we can deadlock when parent sends control request to worker, 438213007Spjd * but worker has no control thread started yet, so parent waits. 439213007Spjd * In the meantime worker sends an event to the parent, but parent 440213007Spjd * is unable to handle the event, because it waits for control 441213007Spjd * request response. 442213007Spjd */ 443213007Spjd error = pthread_create(&td, NULL, ctrl_thread, res); 444218138Spjd PJDLOG_ASSERT(error == 0); 445213007Spjd 446204076Spjd init_remote(res, nvin); 447212038Spjd event_send(res, EVENT_CONNECT); 448204076Spjd 449204076Spjd error = pthread_create(&td, NULL, recv_thread, res); 450218138Spjd PJDLOG_ASSERT(error == 0); 451204076Spjd error = pthread_create(&td, NULL, disk_thread, res); 452218138Spjd PJDLOG_ASSERT(error == 0); 453213007Spjd (void)send_thread(res); 454204076Spjd} 455204076Spjd 456204076Spjdstatic void 457204076Spjdreqlog(int loglevel, int debuglevel, int error, struct hio *hio, const char *fmt, ...) 458204076Spjd{ 459204076Spjd char msg[1024]; 460204076Spjd va_list ap; 461204076Spjd int len; 462204076Spjd 463204076Spjd va_start(ap, fmt); 464204076Spjd len = vsnprintf(msg, sizeof(msg), fmt, ap); 465204076Spjd va_end(ap); 466204076Spjd if ((size_t)len < sizeof(msg)) { 467204076Spjd switch (hio->hio_cmd) { 468204076Spjd case HIO_READ: 469204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 470204076Spjd "READ(%ju, %ju).", (uintmax_t)hio->hio_offset, 471204076Spjd (uintmax_t)hio->hio_length); 472204076Spjd break; 473204076Spjd case HIO_DELETE: 474204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 475204076Spjd "DELETE(%ju, %ju).", (uintmax_t)hio->hio_offset, 476204076Spjd (uintmax_t)hio->hio_length); 477204076Spjd break; 478204076Spjd case HIO_FLUSH: 479204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, "FLUSH."); 480204076Spjd break; 481204076Spjd case HIO_WRITE: 482204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 483204076Spjd "WRITE(%ju, %ju).", (uintmax_t)hio->hio_offset, 484204076Spjd (uintmax_t)hio->hio_length); 485204076Spjd break; 486211882Spjd case HIO_KEEPALIVE: 487211882Spjd (void)snprintf(msg + len, sizeof(msg) - len, "KEEPALIVE."); 488211882Spjd break; 489204076Spjd default: 490204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 491204076Spjd "UNKNOWN(%u).", (unsigned int)hio->hio_cmd); 492204076Spjd break; 493204076Spjd } 494204076Spjd } 495204076Spjd pjdlog_common(loglevel, debuglevel, error, "%s", msg); 496204076Spjd} 497204076Spjd 498204076Spjdstatic int 499204076Spjdrequnpack(struct hast_resource *res, struct hio *hio) 500204076Spjd{ 501204076Spjd 502204076Spjd hio->hio_cmd = nv_get_uint8(hio->hio_nv, "cmd"); 503204076Spjd if (hio->hio_cmd == 0) { 504204076Spjd pjdlog_error("Header contains no 'cmd' field."); 505204076Spjd hio->hio_error = EINVAL; 506204076Spjd goto end; 507204076Spjd } 508204076Spjd switch (hio->hio_cmd) { 509211882Spjd case HIO_KEEPALIVE: 510211882Spjd break; 511204076Spjd case HIO_READ: 512204076Spjd case HIO_WRITE: 513204076Spjd case HIO_DELETE: 514204076Spjd hio->hio_offset = nv_get_uint64(hio->hio_nv, "offset"); 515204076Spjd if (nv_error(hio->hio_nv) != 0) { 516204076Spjd pjdlog_error("Header is missing 'offset' field."); 517204076Spjd hio->hio_error = EINVAL; 518204076Spjd goto end; 519204076Spjd } 520204076Spjd hio->hio_length = nv_get_uint64(hio->hio_nv, "length"); 521204076Spjd if (nv_error(hio->hio_nv) != 0) { 522204076Spjd pjdlog_error("Header is missing 'length' field."); 523204076Spjd hio->hio_error = EINVAL; 524204076Spjd goto end; 525204076Spjd } 526204076Spjd if (hio->hio_length == 0) { 527204076Spjd pjdlog_error("Data length is zero."); 528204076Spjd hio->hio_error = EINVAL; 529204076Spjd goto end; 530204076Spjd } 531204076Spjd if (hio->hio_length > MAXPHYS) { 532204076Spjd pjdlog_error("Data length is too large (%ju > %ju).", 533204076Spjd (uintmax_t)hio->hio_length, (uintmax_t)MAXPHYS); 534204076Spjd hio->hio_error = EINVAL; 535204076Spjd goto end; 536204076Spjd } 537204076Spjd if ((hio->hio_offset % res->hr_local_sectorsize) != 0) { 538204076Spjd pjdlog_error("Offset %ju is not multiple of sector size.", 539204076Spjd (uintmax_t)hio->hio_offset); 540204076Spjd hio->hio_error = EINVAL; 541204076Spjd goto end; 542204076Spjd } 543204076Spjd if ((hio->hio_length % res->hr_local_sectorsize) != 0) { 544204076Spjd pjdlog_error("Length %ju is not multiple of sector size.", 545204076Spjd (uintmax_t)hio->hio_length); 546204076Spjd hio->hio_error = EINVAL; 547204076Spjd goto end; 548204076Spjd } 549204076Spjd if (hio->hio_offset + hio->hio_length > 550204076Spjd (uint64_t)res->hr_datasize) { 551204076Spjd pjdlog_error("Data offset is too large (%ju > %ju).", 552204076Spjd (uintmax_t)(hio->hio_offset + hio->hio_length), 553204076Spjd (uintmax_t)res->hr_datasize); 554204076Spjd hio->hio_error = EINVAL; 555204076Spjd goto end; 556204076Spjd } 557204076Spjd break; 558204076Spjd default: 559204076Spjd pjdlog_error("Header contains invalid 'cmd' (%hhu).", 560204076Spjd hio->hio_cmd); 561204076Spjd hio->hio_error = EINVAL; 562204076Spjd goto end; 563204076Spjd } 564204076Spjd hio->hio_error = 0; 565204076Spjdend: 566204076Spjd return (hio->hio_error); 567204076Spjd} 568204076Spjd 569212899Spjdstatic __dead2 void 570211984Spjdsecondary_exit(int exitcode, const char *fmt, ...) 571211984Spjd{ 572211984Spjd va_list ap; 573211984Spjd 574218138Spjd PJDLOG_ASSERT(exitcode != EX_OK); 575211984Spjd va_start(ap, fmt); 576211984Spjd pjdlogv_errno(LOG_ERR, fmt, ap); 577211984Spjd va_end(ap); 578212038Spjd event_send(gres, EVENT_DISCONNECT); 579211984Spjd exit(exitcode); 580211984Spjd} 581211984Spjd 582204076Spjd/* 583204076Spjd * Thread receives requests from the primary node. 584204076Spjd */ 585204076Spjdstatic void * 586204076Spjdrecv_thread(void *arg) 587204076Spjd{ 588204076Spjd struct hast_resource *res = arg; 589204076Spjd struct hio *hio; 590204076Spjd 591204076Spjd for (;;) { 592204076Spjd pjdlog_debug(2, "recv: Taking free request."); 593211877Spjd QUEUE_TAKE(free, hio); 594204076Spjd pjdlog_debug(2, "recv: (%p) Got request.", hio); 595204076Spjd if (hast_proto_recv_hdr(res->hr_remotein, &hio->hio_nv) < 0) { 596211984Spjd secondary_exit(EX_TEMPFAIL, 597204076Spjd "Unable to receive request header"); 598204076Spjd } 599211877Spjd if (requnpack(res, hio) != 0) { 600211877Spjd pjdlog_debug(2, 601211877Spjd "recv: (%p) Moving request to the send queue.", 602211877Spjd hio); 603211877Spjd QUEUE_INSERT(send, hio); 604211877Spjd continue; 605211877Spjd } 606204076Spjd reqlog(LOG_DEBUG, 2, -1, hio, 607204076Spjd "recv: (%p) Got request header: ", hio); 608211882Spjd if (hio->hio_cmd == HIO_KEEPALIVE) { 609211882Spjd pjdlog_debug(2, 610211882Spjd "recv: (%p) Moving request to the free queue.", 611211882Spjd hio); 612211882Spjd nv_free(hio->hio_nv); 613211882Spjd QUEUE_INSERT(free, hio); 614211882Spjd continue; 615211882Spjd } else if (hio->hio_cmd == HIO_WRITE) { 616204076Spjd if (hast_proto_recv_data(res, res->hr_remotein, 617204076Spjd hio->hio_nv, hio->hio_data, MAXPHYS) < 0) { 618211984Spjd secondary_exit(EX_TEMPFAIL, 619212051Spjd "Unable to receive request data"); 620204076Spjd } 621204076Spjd } 622204076Spjd pjdlog_debug(2, "recv: (%p) Moving request to the disk queue.", 623204076Spjd hio); 624211877Spjd QUEUE_INSERT(disk, hio); 625204076Spjd } 626204076Spjd /* NOTREACHED */ 627204076Spjd return (NULL); 628204076Spjd} 629204076Spjd 630204076Spjd/* 631204076Spjd * Thread reads from or writes to local component and also handles DELETE and 632204076Spjd * FLUSH requests. 633204076Spjd */ 634204076Spjdstatic void * 635204076Spjddisk_thread(void *arg) 636204076Spjd{ 637204076Spjd struct hast_resource *res = arg; 638204076Spjd struct hio *hio; 639204076Spjd ssize_t ret; 640211877Spjd bool clear_activemap; 641204076Spjd 642204076Spjd clear_activemap = true; 643204076Spjd 644204076Spjd for (;;) { 645204076Spjd pjdlog_debug(2, "disk: Taking request."); 646211877Spjd QUEUE_TAKE(disk, hio); 647204076Spjd while (clear_activemap) { 648204076Spjd unsigned char *map; 649204076Spjd size_t mapsize; 650204076Spjd 651204076Spjd /* 652204076Spjd * When first request is received, it means that primary 653204076Spjd * already received our activemap, merged it and stored 654204076Spjd * locally. We can now safely clear our activemap. 655204076Spjd */ 656204076Spjd mapsize = 657204076Spjd activemap_calc_ondisk_size(res->hr_local_mediasize - 658204076Spjd METADATA_SIZE, res->hr_extentsize, 659204076Spjd res->hr_local_sectorsize); 660204076Spjd map = calloc(1, mapsize); 661204076Spjd if (map == NULL) { 662204076Spjd pjdlog_warning("Unable to allocate memory to clear local activemap."); 663204076Spjd break; 664204076Spjd } 665204076Spjd if (pwrite(res->hr_localfd, map, mapsize, 666204076Spjd METADATA_SIZE) != (ssize_t)mapsize) { 667204076Spjd pjdlog_errno(LOG_WARNING, 668204076Spjd "Unable to store cleared activemap"); 669204076Spjd free(map); 670204076Spjd break; 671204076Spjd } 672204076Spjd free(map); 673204076Spjd clear_activemap = false; 674204076Spjd pjdlog_debug(1, "Local activemap cleared."); 675204076Spjd } 676204076Spjd reqlog(LOG_DEBUG, 2, -1, hio, "disk: (%p) Got request: ", hio); 677204076Spjd /* Handle the actual request. */ 678204076Spjd switch (hio->hio_cmd) { 679204076Spjd case HIO_READ: 680204076Spjd ret = pread(res->hr_localfd, hio->hio_data, 681204076Spjd hio->hio_length, 682204076Spjd hio->hio_offset + res->hr_localoff); 683204076Spjd if (ret < 0) 684204076Spjd hio->hio_error = errno; 685204076Spjd else if (ret != (int64_t)hio->hio_length) 686204076Spjd hio->hio_error = EIO; 687204076Spjd else 688204076Spjd hio->hio_error = 0; 689204076Spjd break; 690204076Spjd case HIO_WRITE: 691204076Spjd ret = pwrite(res->hr_localfd, hio->hio_data, 692204076Spjd hio->hio_length, 693204076Spjd hio->hio_offset + res->hr_localoff); 694204076Spjd if (ret < 0) 695204076Spjd hio->hio_error = errno; 696204076Spjd else if (ret != (int64_t)hio->hio_length) 697204076Spjd hio->hio_error = EIO; 698204076Spjd else 699204076Spjd hio->hio_error = 0; 700204076Spjd break; 701204076Spjd case HIO_DELETE: 702204076Spjd ret = g_delete(res->hr_localfd, 703204076Spjd hio->hio_offset + res->hr_localoff, 704204076Spjd hio->hio_length); 705204076Spjd if (ret < 0) 706204076Spjd hio->hio_error = errno; 707204076Spjd else 708204076Spjd hio->hio_error = 0; 709204076Spjd break; 710204076Spjd case HIO_FLUSH: 711204076Spjd ret = g_flush(res->hr_localfd); 712204076Spjd if (ret < 0) 713204076Spjd hio->hio_error = errno; 714204076Spjd else 715204076Spjd hio->hio_error = 0; 716204076Spjd break; 717204076Spjd } 718204076Spjd if (hio->hio_error != 0) { 719204076Spjd reqlog(LOG_ERR, 0, hio->hio_error, hio, 720204076Spjd "Request failed: "); 721204076Spjd } 722204076Spjd pjdlog_debug(2, "disk: (%p) Moving request to the send queue.", 723204076Spjd hio); 724211877Spjd QUEUE_INSERT(send, hio); 725204076Spjd } 726204076Spjd /* NOTREACHED */ 727204076Spjd return (NULL); 728204076Spjd} 729204076Spjd 730204076Spjd/* 731204076Spjd * Thread sends requests back to primary node. 732204076Spjd */ 733204076Spjdstatic void * 734204076Spjdsend_thread(void *arg) 735204076Spjd{ 736204076Spjd struct hast_resource *res = arg; 737204076Spjd struct nv *nvout; 738204076Spjd struct hio *hio; 739204076Spjd void *data; 740204076Spjd size_t length; 741204076Spjd 742204076Spjd for (;;) { 743204076Spjd pjdlog_debug(2, "send: Taking request."); 744211877Spjd QUEUE_TAKE(send, hio); 745204076Spjd reqlog(LOG_DEBUG, 2, -1, hio, "send: (%p) Got request: ", hio); 746204076Spjd nvout = nv_alloc(); 747204076Spjd /* Copy sequence number. */ 748204076Spjd nv_add_uint64(nvout, nv_get_uint64(hio->hio_nv, "seq"), "seq"); 749204076Spjd switch (hio->hio_cmd) { 750204076Spjd case HIO_READ: 751204076Spjd if (hio->hio_error == 0) { 752204076Spjd data = hio->hio_data; 753204076Spjd length = hio->hio_length; 754204076Spjd break; 755204076Spjd } 756204076Spjd /* 757204076Spjd * We send no data in case of an error. 758204076Spjd */ 759204076Spjd /* FALLTHROUGH */ 760204076Spjd case HIO_DELETE: 761204076Spjd case HIO_FLUSH: 762204076Spjd case HIO_WRITE: 763204076Spjd data = NULL; 764204076Spjd length = 0; 765204076Spjd break; 766204076Spjd default: 767204076Spjd abort(); 768204076Spjd break; 769204076Spjd } 770204076Spjd if (hio->hio_error != 0) 771204076Spjd nv_add_int16(nvout, hio->hio_error, "error"); 772204076Spjd if (hast_proto_send(res, res->hr_remoteout, nvout, data, 773204076Spjd length) < 0) { 774211984Spjd secondary_exit(EX_TEMPFAIL, "Unable to send reply."); 775204076Spjd } 776204076Spjd nv_free(nvout); 777209185Spjd pjdlog_debug(2, "send: (%p) Moving request to the free queue.", 778204076Spjd hio); 779204076Spjd nv_free(hio->hio_nv); 780204076Spjd hio->hio_error = 0; 781211877Spjd QUEUE_INSERT(free, hio); 782204076Spjd } 783204076Spjd /* NOTREACHED */ 784204076Spjd return (NULL); 785204076Spjd} 786