secondary.c revision 212051
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 212051 2010-08-31 12:03:29Z 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 <assert.h> 41204076Spjd#include <err.h> 42204076Spjd#include <errno.h> 43204076Spjd#include <fcntl.h> 44204076Spjd#include <libgeom.h> 45204076Spjd#include <pthread.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 { 68204076Spjd uint64_t hio_seq; 69204076Spjd 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 /* 245204076Spjd * Provider is used for the first time. Initialize everything. 246204076Spjd */ 247204076Spjd assert(res->hr_secondary_localcnt == 0); 248204076Spjd res->hr_resuid = resuid; 249204076Spjd if (metadata_write(res) < 0) 250204076Spjd exit(EX_NOINPUT); 251204076Spjd memset(map, 0xff, mapsize); 252204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 253204076Spjd } else if ( 254204076Spjd /* Is primary is out-of-date? */ 255204076Spjd (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 256204076Spjd res->hr_secondary_remotecnt == res->hr_primary_localcnt) || 257204076Spjd /* Node are more or less in sync? */ 258204076Spjd (res->hr_secondary_localcnt == res->hr_primary_remotecnt && 259204076Spjd res->hr_secondary_remotecnt == res->hr_primary_localcnt) || 260204076Spjd /* Is secondary is out-of-date? */ 261204076Spjd (res->hr_secondary_localcnt == res->hr_primary_remotecnt && 262204076Spjd res->hr_secondary_remotecnt < res->hr_primary_localcnt)) { 263204076Spjd /* 264204076Spjd * Nodes are more or less in sync or one of the nodes is 265204076Spjd * out-of-date. 266204076Spjd * It doesn't matter at this point which one, we just have to 267204076Spjd * send out local bitmap to the remote node. 268204076Spjd */ 269204076Spjd if (pread(res->hr_localfd, map, mapsize, METADATA_SIZE) != 270204076Spjd (ssize_t)mapsize) { 271204076Spjd pjdlog_exit(LOG_ERR, "Unable to read activemap"); 272204076Spjd } 273204076Spjd if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 274204076Spjd res->hr_secondary_remotecnt == res->hr_primary_localcnt) { 275204076Spjd /* Primary is out-of-date, sync from secondary. */ 276204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_SECONDARY, "syncsrc"); 277204076Spjd } else { 278204076Spjd /* 279204076Spjd * Secondary is out-of-date or counts match. 280204076Spjd * Sync from primary. 281204076Spjd */ 282204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 283204076Spjd } 284204076Spjd } else if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 285204076Spjd res->hr_primary_localcnt > res->hr_secondary_remotecnt) { 286204076Spjd /* 287204076Spjd * Not good, we have split-brain condition. 288204076Spjd */ 289204076Spjd pjdlog_error("Split-brain detected, exiting."); 290204076Spjd nv_add_string(nvout, "Split-brain condition!", "errmsg"); 291204076Spjd free(map); 292204076Spjd map = NULL; 293204076Spjd mapsize = 0; 294204076Spjd } else /* if (res->hr_secondary_localcnt < res->hr_primary_remotecnt || 295204076Spjd res->hr_primary_localcnt < res->hr_secondary_remotecnt) */ { 296204076Spjd /* 297204076Spjd * This should never happen in practise, but we will perform 298204076Spjd * full synchronization. 299204076Spjd */ 300204076Spjd assert(res->hr_secondary_localcnt < res->hr_primary_remotecnt || 301204076Spjd res->hr_primary_localcnt < res->hr_secondary_remotecnt); 302204076Spjd mapsize = activemap_calc_ondisk_size(res->hr_local_mediasize - 303204076Spjd METADATA_SIZE, res->hr_extentsize, 304204076Spjd res->hr_local_sectorsize); 305204076Spjd memset(map, 0xff, mapsize); 306204076Spjd if (res->hr_secondary_localcnt > res->hr_primary_remotecnt) { 307204076Spjd /* In this one of five cases sync from secondary. */ 308204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_SECONDARY, "syncsrc"); 309204076Spjd } else { 310204076Spjd /* For the rest four cases sync from primary. */ 311204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 312204076Spjd } 313204076Spjd pjdlog_warning("This should never happen, asking for full synchronization (primary(local=%ju, remote=%ju), secondary(local=%ju, remote=%ju)).", 314204076Spjd (uintmax_t)res->hr_primary_localcnt, 315204076Spjd (uintmax_t)res->hr_primary_remotecnt, 316204076Spjd (uintmax_t)res->hr_secondary_localcnt, 317204076Spjd (uintmax_t)res->hr_secondary_remotecnt); 318204076Spjd } 319204076Spjd if (hast_proto_send(res, res->hr_remotein, nvout, map, mapsize) < 0) { 320204076Spjd pjdlog_errno(LOG_WARNING, "Unable to send activemap to %s", 321204076Spjd res->hr_remoteaddr); 322204076Spjd nv_free(nvout); 323204076Spjd exit(EX_TEMPFAIL); 324204076Spjd } 325209182Spjd nv_free(nvout); 326204076Spjd if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 327204076Spjd res->hr_primary_localcnt > res->hr_secondary_remotecnt) { 328204076Spjd /* Exit on split-brain. */ 329212038Spjd event_send(res, EVENT_SPLITBRAIN); 330204076Spjd exit(EX_CONFIG); 331204076Spjd } 332204076Spjd} 333204076Spjd 334204076Spjdvoid 335204076Spjdhastd_secondary(struct hast_resource *res, struct nv *nvin) 336204076Spjd{ 337204076Spjd pthread_t td; 338204076Spjd pid_t pid; 339204076Spjd int error; 340204076Spjd 341204076Spjd /* 342204076Spjd * Create communication channel between parent and child. 343204076Spjd */ 344204076Spjd if (proto_client("socketpair://", &res->hr_ctrl) < 0) { 345204076Spjd KEEP_ERRNO((void)pidfile_remove(pfh)); 346204076Spjd pjdlog_exit(EX_OSERR, 347204076Spjd "Unable to create control sockets between parent and child"); 348204076Spjd } 349212038Spjd /* 350212038Spjd * Create communication channel between child and parent. 351212038Spjd */ 352212038Spjd if (proto_client("socketpair://", &res->hr_event) < 0) { 353212038Spjd KEEP_ERRNO((void)pidfile_remove(pfh)); 354212038Spjd pjdlog_exit(EX_OSERR, 355212038Spjd "Unable to create event sockets between child and parent"); 356212038Spjd } 357204076Spjd 358204076Spjd pid = fork(); 359204076Spjd if (pid < 0) { 360204076Spjd KEEP_ERRNO((void)pidfile_remove(pfh)); 361204076Spjd pjdlog_exit(EX_OSERR, "Unable to fork"); 362204076Spjd } 363204076Spjd 364204076Spjd if (pid > 0) { 365204076Spjd /* This is parent. */ 366204076Spjd proto_close(res->hr_remotein); 367204076Spjd res->hr_remotein = NULL; 368204076Spjd proto_close(res->hr_remoteout); 369204076Spjd res->hr_remoteout = NULL; 370212038Spjd /* Declare that we are receiver. */ 371212038Spjd proto_recv(res->hr_event, NULL, 0); 372204076Spjd res->hr_workerpid = pid; 373204076Spjd return; 374204076Spjd } 375211977Spjd 376211984Spjd gres = res; 377211984Spjd 378204076Spjd (void)pidfile_close(pfh); 379211977Spjd hook_fini(); 380204076Spjd 381204076Spjd setproctitle("%s (secondary)", res->hr_name); 382204076Spjd 383210880Spjd signal(SIGHUP, SIG_DFL); 384210880Spjd signal(SIGCHLD, SIG_DFL); 385210880Spjd 386212038Spjd /* Declare that we are sender. */ 387212038Spjd proto_send(res->hr_event, NULL, 0); 388212038Spjd 389207371Spjd /* Error in setting timeout is not critical, but why should it fail? */ 390207371Spjd if (proto_timeout(res->hr_remotein, 0) < 0) 391207371Spjd pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 392207371Spjd if (proto_timeout(res->hr_remoteout, res->hr_timeout) < 0) 393207371Spjd pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 394207371Spjd 395204076Spjd init_local(res); 396204076Spjd init_remote(res, nvin); 397204076Spjd init_environment(); 398212038Spjd event_send(res, EVENT_CONNECT); 399204076Spjd 400204076Spjd error = pthread_create(&td, NULL, recv_thread, res); 401204076Spjd assert(error == 0); 402204076Spjd error = pthread_create(&td, NULL, disk_thread, res); 403204076Spjd assert(error == 0); 404204076Spjd error = pthread_create(&td, NULL, send_thread, res); 405204076Spjd assert(error == 0); 406204076Spjd (void)ctrl_thread(res); 407204076Spjd} 408204076Spjd 409204076Spjdstatic void 410204076Spjdreqlog(int loglevel, int debuglevel, int error, struct hio *hio, const char *fmt, ...) 411204076Spjd{ 412204076Spjd char msg[1024]; 413204076Spjd va_list ap; 414204076Spjd int len; 415204076Spjd 416204076Spjd va_start(ap, fmt); 417204076Spjd len = vsnprintf(msg, sizeof(msg), fmt, ap); 418204076Spjd va_end(ap); 419204076Spjd if ((size_t)len < sizeof(msg)) { 420204076Spjd switch (hio->hio_cmd) { 421204076Spjd case HIO_READ: 422204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 423204076Spjd "READ(%ju, %ju).", (uintmax_t)hio->hio_offset, 424204076Spjd (uintmax_t)hio->hio_length); 425204076Spjd break; 426204076Spjd case HIO_DELETE: 427204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 428204076Spjd "DELETE(%ju, %ju).", (uintmax_t)hio->hio_offset, 429204076Spjd (uintmax_t)hio->hio_length); 430204076Spjd break; 431204076Spjd case HIO_FLUSH: 432204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, "FLUSH."); 433204076Spjd break; 434204076Spjd case HIO_WRITE: 435204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 436204076Spjd "WRITE(%ju, %ju).", (uintmax_t)hio->hio_offset, 437204076Spjd (uintmax_t)hio->hio_length); 438204076Spjd break; 439211882Spjd case HIO_KEEPALIVE: 440211882Spjd (void)snprintf(msg + len, sizeof(msg) - len, "KEEPALIVE."); 441211882Spjd break; 442204076Spjd default: 443204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 444204076Spjd "UNKNOWN(%u).", (unsigned int)hio->hio_cmd); 445204076Spjd break; 446204076Spjd } 447204076Spjd } 448204076Spjd pjdlog_common(loglevel, debuglevel, error, "%s", msg); 449204076Spjd} 450204076Spjd 451204076Spjdstatic int 452204076Spjdrequnpack(struct hast_resource *res, struct hio *hio) 453204076Spjd{ 454204076Spjd 455204076Spjd hio->hio_cmd = nv_get_uint8(hio->hio_nv, "cmd"); 456204076Spjd if (hio->hio_cmd == 0) { 457204076Spjd pjdlog_error("Header contains no 'cmd' field."); 458204076Spjd hio->hio_error = EINVAL; 459204076Spjd goto end; 460204076Spjd } 461204076Spjd switch (hio->hio_cmd) { 462211882Spjd case HIO_KEEPALIVE: 463211882Spjd break; 464204076Spjd case HIO_READ: 465204076Spjd case HIO_WRITE: 466204076Spjd case HIO_DELETE: 467204076Spjd hio->hio_offset = nv_get_uint64(hio->hio_nv, "offset"); 468204076Spjd if (nv_error(hio->hio_nv) != 0) { 469204076Spjd pjdlog_error("Header is missing 'offset' field."); 470204076Spjd hio->hio_error = EINVAL; 471204076Spjd goto end; 472204076Spjd } 473204076Spjd hio->hio_length = nv_get_uint64(hio->hio_nv, "length"); 474204076Spjd if (nv_error(hio->hio_nv) != 0) { 475204076Spjd pjdlog_error("Header is missing 'length' field."); 476204076Spjd hio->hio_error = EINVAL; 477204076Spjd goto end; 478204076Spjd } 479204076Spjd if (hio->hio_length == 0) { 480204076Spjd pjdlog_error("Data length is zero."); 481204076Spjd hio->hio_error = EINVAL; 482204076Spjd goto end; 483204076Spjd } 484204076Spjd if (hio->hio_length > MAXPHYS) { 485204076Spjd pjdlog_error("Data length is too large (%ju > %ju).", 486204076Spjd (uintmax_t)hio->hio_length, (uintmax_t)MAXPHYS); 487204076Spjd hio->hio_error = EINVAL; 488204076Spjd goto end; 489204076Spjd } 490204076Spjd if ((hio->hio_offset % res->hr_local_sectorsize) != 0) { 491204076Spjd pjdlog_error("Offset %ju is not multiple of sector size.", 492204076Spjd (uintmax_t)hio->hio_offset); 493204076Spjd hio->hio_error = EINVAL; 494204076Spjd goto end; 495204076Spjd } 496204076Spjd if ((hio->hio_length % res->hr_local_sectorsize) != 0) { 497204076Spjd pjdlog_error("Length %ju is not multiple of sector size.", 498204076Spjd (uintmax_t)hio->hio_length); 499204076Spjd hio->hio_error = EINVAL; 500204076Spjd goto end; 501204076Spjd } 502204076Spjd if (hio->hio_offset + hio->hio_length > 503204076Spjd (uint64_t)res->hr_datasize) { 504204076Spjd pjdlog_error("Data offset is too large (%ju > %ju).", 505204076Spjd (uintmax_t)(hio->hio_offset + hio->hio_length), 506204076Spjd (uintmax_t)res->hr_datasize); 507204076Spjd hio->hio_error = EINVAL; 508204076Spjd goto end; 509204076Spjd } 510204076Spjd break; 511204076Spjd default: 512204076Spjd pjdlog_error("Header contains invalid 'cmd' (%hhu).", 513204076Spjd hio->hio_cmd); 514204076Spjd hio->hio_error = EINVAL; 515204076Spjd goto end; 516204076Spjd } 517204076Spjd hio->hio_error = 0; 518204076Spjdend: 519204076Spjd return (hio->hio_error); 520204076Spjd} 521204076Spjd 522211984Spjdstatic void 523211984Spjdsecondary_exit(int exitcode, const char *fmt, ...) 524211984Spjd{ 525211984Spjd va_list ap; 526211984Spjd 527211984Spjd assert(exitcode != EX_OK); 528211984Spjd va_start(ap, fmt); 529211984Spjd pjdlogv_errno(LOG_ERR, fmt, ap); 530211984Spjd va_end(ap); 531212038Spjd event_send(gres, EVENT_DISCONNECT); 532211984Spjd exit(exitcode); 533211984Spjd} 534211984Spjd 535204076Spjd/* 536204076Spjd * Thread receives requests from the primary node. 537204076Spjd */ 538204076Spjdstatic void * 539204076Spjdrecv_thread(void *arg) 540204076Spjd{ 541204076Spjd struct hast_resource *res = arg; 542204076Spjd struct hio *hio; 543204076Spjd 544204076Spjd for (;;) { 545204076Spjd pjdlog_debug(2, "recv: Taking free request."); 546211877Spjd QUEUE_TAKE(free, hio); 547204076Spjd pjdlog_debug(2, "recv: (%p) Got request.", hio); 548204076Spjd if (hast_proto_recv_hdr(res->hr_remotein, &hio->hio_nv) < 0) { 549211984Spjd secondary_exit(EX_TEMPFAIL, 550204076Spjd "Unable to receive request header"); 551204076Spjd } 552211877Spjd if (requnpack(res, hio) != 0) { 553211877Spjd pjdlog_debug(2, 554211877Spjd "recv: (%p) Moving request to the send queue.", 555211877Spjd hio); 556211877Spjd QUEUE_INSERT(send, hio); 557211877Spjd continue; 558211877Spjd } 559204076Spjd reqlog(LOG_DEBUG, 2, -1, hio, 560204076Spjd "recv: (%p) Got request header: ", hio); 561211882Spjd if (hio->hio_cmd == HIO_KEEPALIVE) { 562211882Spjd pjdlog_debug(2, 563211882Spjd "recv: (%p) Moving request to the free queue.", 564211882Spjd hio); 565211882Spjd nv_free(hio->hio_nv); 566211882Spjd QUEUE_INSERT(free, hio); 567211882Spjd continue; 568211882Spjd } else if (hio->hio_cmd == HIO_WRITE) { 569204076Spjd if (hast_proto_recv_data(res, res->hr_remotein, 570204076Spjd hio->hio_nv, hio->hio_data, MAXPHYS) < 0) { 571211984Spjd secondary_exit(EX_TEMPFAIL, 572212051Spjd "Unable to receive request data"); 573204076Spjd } 574204076Spjd } 575204076Spjd pjdlog_debug(2, "recv: (%p) Moving request to the disk queue.", 576204076Spjd hio); 577211877Spjd QUEUE_INSERT(disk, hio); 578204076Spjd } 579204076Spjd /* NOTREACHED */ 580204076Spjd return (NULL); 581204076Spjd} 582204076Spjd 583204076Spjd/* 584204076Spjd * Thread reads from or writes to local component and also handles DELETE and 585204076Spjd * FLUSH requests. 586204076Spjd */ 587204076Spjdstatic void * 588204076Spjddisk_thread(void *arg) 589204076Spjd{ 590204076Spjd struct hast_resource *res = arg; 591204076Spjd struct hio *hio; 592204076Spjd ssize_t ret; 593211877Spjd bool clear_activemap; 594204076Spjd 595204076Spjd clear_activemap = true; 596204076Spjd 597204076Spjd for (;;) { 598204076Spjd pjdlog_debug(2, "disk: Taking request."); 599211877Spjd QUEUE_TAKE(disk, hio); 600204076Spjd while (clear_activemap) { 601204076Spjd unsigned char *map; 602204076Spjd size_t mapsize; 603204076Spjd 604204076Spjd /* 605204076Spjd * When first request is received, it means that primary 606204076Spjd * already received our activemap, merged it and stored 607204076Spjd * locally. We can now safely clear our activemap. 608204076Spjd */ 609204076Spjd mapsize = 610204076Spjd activemap_calc_ondisk_size(res->hr_local_mediasize - 611204076Spjd METADATA_SIZE, res->hr_extentsize, 612204076Spjd res->hr_local_sectorsize); 613204076Spjd map = calloc(1, mapsize); 614204076Spjd if (map == NULL) { 615204076Spjd pjdlog_warning("Unable to allocate memory to clear local activemap."); 616204076Spjd break; 617204076Spjd } 618204076Spjd if (pwrite(res->hr_localfd, map, mapsize, 619204076Spjd METADATA_SIZE) != (ssize_t)mapsize) { 620204076Spjd pjdlog_errno(LOG_WARNING, 621204076Spjd "Unable to store cleared activemap"); 622204076Spjd free(map); 623204076Spjd break; 624204076Spjd } 625204076Spjd free(map); 626204076Spjd clear_activemap = false; 627204076Spjd pjdlog_debug(1, "Local activemap cleared."); 628204076Spjd } 629204076Spjd reqlog(LOG_DEBUG, 2, -1, hio, "disk: (%p) Got request: ", hio); 630204076Spjd /* Handle the actual request. */ 631204076Spjd switch (hio->hio_cmd) { 632204076Spjd case HIO_READ: 633204076Spjd ret = pread(res->hr_localfd, hio->hio_data, 634204076Spjd hio->hio_length, 635204076Spjd hio->hio_offset + res->hr_localoff); 636204076Spjd if (ret < 0) 637204076Spjd hio->hio_error = errno; 638204076Spjd else if (ret != (int64_t)hio->hio_length) 639204076Spjd hio->hio_error = EIO; 640204076Spjd else 641204076Spjd hio->hio_error = 0; 642204076Spjd break; 643204076Spjd case HIO_WRITE: 644204076Spjd ret = pwrite(res->hr_localfd, hio->hio_data, 645204076Spjd hio->hio_length, 646204076Spjd hio->hio_offset + res->hr_localoff); 647204076Spjd if (ret < 0) 648204076Spjd hio->hio_error = errno; 649204076Spjd else if (ret != (int64_t)hio->hio_length) 650204076Spjd hio->hio_error = EIO; 651204076Spjd else 652204076Spjd hio->hio_error = 0; 653204076Spjd break; 654204076Spjd case HIO_DELETE: 655204076Spjd ret = g_delete(res->hr_localfd, 656204076Spjd hio->hio_offset + res->hr_localoff, 657204076Spjd hio->hio_length); 658204076Spjd if (ret < 0) 659204076Spjd hio->hio_error = errno; 660204076Spjd else 661204076Spjd hio->hio_error = 0; 662204076Spjd break; 663204076Spjd case HIO_FLUSH: 664204076Spjd ret = g_flush(res->hr_localfd); 665204076Spjd if (ret < 0) 666204076Spjd hio->hio_error = errno; 667204076Spjd else 668204076Spjd hio->hio_error = 0; 669204076Spjd break; 670204076Spjd } 671204076Spjd if (hio->hio_error != 0) { 672204076Spjd reqlog(LOG_ERR, 0, hio->hio_error, hio, 673204076Spjd "Request failed: "); 674204076Spjd } 675204076Spjd pjdlog_debug(2, "disk: (%p) Moving request to the send queue.", 676204076Spjd hio); 677211877Spjd QUEUE_INSERT(send, hio); 678204076Spjd } 679204076Spjd /* NOTREACHED */ 680204076Spjd return (NULL); 681204076Spjd} 682204076Spjd 683204076Spjd/* 684204076Spjd * Thread sends requests back to primary node. 685204076Spjd */ 686204076Spjdstatic void * 687204076Spjdsend_thread(void *arg) 688204076Spjd{ 689204076Spjd struct hast_resource *res = arg; 690204076Spjd struct nv *nvout; 691204076Spjd struct hio *hio; 692204076Spjd void *data; 693204076Spjd size_t length; 694204076Spjd 695204076Spjd for (;;) { 696204076Spjd pjdlog_debug(2, "send: Taking request."); 697211877Spjd QUEUE_TAKE(send, hio); 698204076Spjd reqlog(LOG_DEBUG, 2, -1, hio, "send: (%p) Got request: ", hio); 699204076Spjd nvout = nv_alloc(); 700204076Spjd /* Copy sequence number. */ 701204076Spjd nv_add_uint64(nvout, nv_get_uint64(hio->hio_nv, "seq"), "seq"); 702204076Spjd switch (hio->hio_cmd) { 703204076Spjd case HIO_READ: 704204076Spjd if (hio->hio_error == 0) { 705204076Spjd data = hio->hio_data; 706204076Spjd length = hio->hio_length; 707204076Spjd break; 708204076Spjd } 709204076Spjd /* 710204076Spjd * We send no data in case of an error. 711204076Spjd */ 712204076Spjd /* FALLTHROUGH */ 713204076Spjd case HIO_DELETE: 714204076Spjd case HIO_FLUSH: 715204076Spjd case HIO_WRITE: 716204076Spjd data = NULL; 717204076Spjd length = 0; 718204076Spjd break; 719204076Spjd default: 720204076Spjd abort(); 721204076Spjd break; 722204076Spjd } 723204076Spjd if (hio->hio_error != 0) 724204076Spjd nv_add_int16(nvout, hio->hio_error, "error"); 725204076Spjd if (hast_proto_send(res, res->hr_remoteout, nvout, data, 726204076Spjd length) < 0) { 727211984Spjd secondary_exit(EX_TEMPFAIL, "Unable to send reply."); 728204076Spjd } 729204076Spjd nv_free(nvout); 730209185Spjd pjdlog_debug(2, "send: (%p) Moving request to the free queue.", 731204076Spjd hio); 732204076Spjd nv_free(hio->hio_nv); 733204076Spjd hio->hio_error = 0; 734211877Spjd QUEUE_INSERT(free, hio); 735204076Spjd } 736204076Spjd /* NOTREACHED */ 737204076Spjd return (NULL); 738204076Spjd} 739