secondary.c revision 211882
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 211882 2010-08-27 14:26:37Z 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" 57204076Spjd#include "hast.h" 58204076Spjd#include "hast_proto.h" 59204076Spjd#include "hastd.h" 60204076Spjd#include "metadata.h" 61204076Spjd#include "proto.h" 62204076Spjd#include "subr.h" 63204076Spjd#include "synch.h" 64204076Spjd 65204076Spjdstruct hio { 66204076Spjd uint64_t hio_seq; 67204076Spjd int hio_error; 68204076Spjd struct nv *hio_nv; 69204076Spjd void *hio_data; 70204076Spjd uint8_t hio_cmd; 71204076Spjd uint64_t hio_offset; 72204076Spjd uint64_t hio_length; 73204076Spjd TAILQ_ENTRY(hio) hio_next; 74204076Spjd}; 75204076Spjd 76204076Spjd/* 77204076Spjd * Free list holds unused structures. When free list is empty, we have to wait 78204076Spjd * until some in-progress requests are freed. 79204076Spjd */ 80204076Spjdstatic TAILQ_HEAD(, hio) hio_free_list; 81204076Spjdstatic pthread_mutex_t hio_free_list_lock; 82204076Spjdstatic pthread_cond_t hio_free_list_cond; 83204076Spjd/* 84204076Spjd * Disk thread (the one that do I/O requests) takes requests from this list. 85204076Spjd */ 86204076Spjdstatic TAILQ_HEAD(, hio) hio_disk_list; 87204076Spjdstatic pthread_mutex_t hio_disk_list_lock; 88204076Spjdstatic pthread_cond_t hio_disk_list_cond; 89204076Spjd/* 90204076Spjd * There is one recv list for every component, although local components don't 91204076Spjd * use recv lists as local requests are done synchronously. 92204076Spjd */ 93204076Spjdstatic TAILQ_HEAD(, hio) hio_send_list; 94204076Spjdstatic pthread_mutex_t hio_send_list_lock; 95204076Spjdstatic pthread_cond_t hio_send_list_cond; 96204076Spjd 97204076Spjd/* 98204076Spjd * Maximum number of outstanding I/O requests. 99204076Spjd */ 100204076Spjd#define HAST_HIO_MAX 256 101204076Spjd 102204076Spjdstatic void *recv_thread(void *arg); 103204076Spjdstatic void *disk_thread(void *arg); 104204076Spjdstatic void *send_thread(void *arg); 105204076Spjd 106211877Spjd#define QUEUE_INSERT(name, hio) do { \ 107211877Spjd bool _wakeup; \ 108211877Spjd \ 109211877Spjd mtx_lock(&hio_##name##_list_lock); \ 110211877Spjd _wakeup = TAILQ_EMPTY(&hio_##name##_list); \ 111211877Spjd TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_next); \ 112211877Spjd mtx_unlock(&hio_##name##_list_lock); \ 113211877Spjd if (_wakeup) \ 114211877Spjd cv_signal(&hio_##name##_list_cond); \ 115211877Spjd} while (0) 116211877Spjd#define QUEUE_TAKE(name, hio) do { \ 117211877Spjd mtx_lock(&hio_##name##_list_lock); \ 118211877Spjd while (((hio) = TAILQ_FIRST(&hio_##name##_list)) == NULL) { \ 119211877Spjd cv_wait(&hio_##name##_list_cond, \ 120211877Spjd &hio_##name##_list_lock); \ 121211877Spjd } \ 122211877Spjd TAILQ_REMOVE(&hio_##name##_list, (hio), hio_next); \ 123211877Spjd mtx_unlock(&hio_##name##_list_lock); \ 124211877Spjd} while (0) 125211877Spjd 126204076Spjdstatic void 127204076Spjdinit_environment(void) 128204076Spjd{ 129204076Spjd struct hio *hio; 130204076Spjd unsigned int ii; 131204076Spjd 132204076Spjd /* 133204076Spjd * Initialize lists, their locks and theirs condition variables. 134204076Spjd */ 135204076Spjd TAILQ_INIT(&hio_free_list); 136204076Spjd mtx_init(&hio_free_list_lock); 137204076Spjd cv_init(&hio_free_list_cond); 138204076Spjd TAILQ_INIT(&hio_disk_list); 139204076Spjd mtx_init(&hio_disk_list_lock); 140204076Spjd cv_init(&hio_disk_list_cond); 141204076Spjd TAILQ_INIT(&hio_send_list); 142204076Spjd mtx_init(&hio_send_list_lock); 143204076Spjd cv_init(&hio_send_list_cond); 144204076Spjd 145204076Spjd /* 146204076Spjd * Allocate requests pool and initialize requests. 147204076Spjd */ 148204076Spjd for (ii = 0; ii < HAST_HIO_MAX; ii++) { 149204076Spjd hio = malloc(sizeof(*hio)); 150204076Spjd if (hio == NULL) { 151210879Spjd pjdlog_exitx(EX_TEMPFAIL, 152210879Spjd "Unable to allocate memory (%zu bytes) for hio request.", 153210879Spjd sizeof(*hio)); 154204076Spjd } 155204076Spjd hio->hio_error = 0; 156204076Spjd hio->hio_data = malloc(MAXPHYS); 157204076Spjd if (hio->hio_data == NULL) { 158210879Spjd pjdlog_exitx(EX_TEMPFAIL, 159210879Spjd "Unable to allocate memory (%zu bytes) for gctl_data.", 160210879Spjd (size_t)MAXPHYS); 161204076Spjd } 162204076Spjd TAILQ_INSERT_HEAD(&hio_free_list, hio, hio_next); 163204076Spjd } 164204076Spjd} 165204076Spjd 166204076Spjdstatic void 167204076Spjdinit_local(struct hast_resource *res) 168204076Spjd{ 169204076Spjd 170204076Spjd if (metadata_read(res, true) < 0) 171204076Spjd exit(EX_NOINPUT); 172204076Spjd} 173204076Spjd 174204076Spjdstatic void 175204076Spjdinit_remote(struct hast_resource *res, struct nv *nvin) 176204076Spjd{ 177204076Spjd uint64_t resuid; 178204076Spjd struct nv *nvout; 179204076Spjd unsigned char *map; 180204076Spjd size_t mapsize; 181204076Spjd 182204076Spjd map = NULL; 183204076Spjd mapsize = 0; 184204076Spjd nvout = nv_alloc(); 185204076Spjd nv_add_int64(nvout, (int64_t)res->hr_datasize, "datasize"); 186204076Spjd nv_add_int32(nvout, (int32_t)res->hr_extentsize, "extentsize"); 187204076Spjd resuid = nv_get_uint64(nvin, "resuid"); 188204076Spjd res->hr_primary_localcnt = nv_get_uint64(nvin, "localcnt"); 189204076Spjd res->hr_primary_remotecnt = nv_get_uint64(nvin, "remotecnt"); 190204076Spjd nv_add_uint64(nvout, res->hr_secondary_localcnt, "localcnt"); 191204076Spjd nv_add_uint64(nvout, res->hr_secondary_remotecnt, "remotecnt"); 192204076Spjd mapsize = activemap_calc_ondisk_size(res->hr_local_mediasize - 193204076Spjd METADATA_SIZE, res->hr_extentsize, res->hr_local_sectorsize); 194204076Spjd map = malloc(mapsize); 195204076Spjd if (map == NULL) { 196204076Spjd pjdlog_exitx(EX_TEMPFAIL, 197204076Spjd "Unable to allocate memory (%zu bytes) for activemap.", 198204076Spjd mapsize); 199204076Spjd } 200204076Spjd nv_add_uint32(nvout, (uint32_t)mapsize, "mapsize"); 201204076Spjd /* 202204076Spjd * When we work as primary and secondary is missing we will increase 203204076Spjd * localcnt in our metadata. When secondary is connected and synced 204204076Spjd * we make localcnt be equal to remotecnt, which means nodes are more 205204076Spjd * or less in sync. 206204076Spjd * Split-brain condition is when both nodes are not able to communicate 207204076Spjd * and are both configured as primary nodes. In turn, they can both 208204076Spjd * make incompatible changes to the data and we have to detect that. 209204076Spjd * Under split-brain condition we will increase our localcnt on first 210204076Spjd * write and remote node will increase its localcnt on first write. 211204076Spjd * When we connect we can see that primary's localcnt is greater than 212204076Spjd * our remotecnt (primary was modified while we weren't watching) and 213204076Spjd * our localcnt is greater than primary's remotecnt (we were modified 214204076Spjd * while primary wasn't watching). 215204076Spjd * There are many possible combinations which are all gathered below. 216204076Spjd * Don't pay too much attention to exact numbers, the more important 217204076Spjd * is to compare them. We compare secondary's local with primary's 218204076Spjd * remote and secondary's remote with primary's local. 219204076Spjd * Note that every case where primary's localcnt is smaller than 220204076Spjd * secondary's remotecnt and where secondary's localcnt is smaller than 221204076Spjd * primary's remotecnt should be impossible in practise. We will perform 222204076Spjd * full synchronization then. Those cases are marked with an asterisk. 223204076Spjd * Regular synchronization means that only extents marked as dirty are 224204076Spjd * synchronized (regular synchronization). 225204076Spjd * 226204076Spjd * SECONDARY METADATA PRIMARY METADATA 227204076Spjd * local=3 remote=3 local=2 remote=2* ?! Full sync from secondary. 228204076Spjd * local=3 remote=3 local=2 remote=3* ?! Full sync from primary. 229204076Spjd * local=3 remote=3 local=2 remote=4* ?! Full sync from primary. 230204076Spjd * local=3 remote=3 local=3 remote=2 Primary is out-of-date, 231204076Spjd * regular sync from secondary. 232204076Spjd * local=3 remote=3 local=3 remote=3 Regular sync just in case. 233204076Spjd * local=3 remote=3 local=3 remote=4* ?! Full sync from primary. 234204076Spjd * local=3 remote=3 local=4 remote=2 Split-brain condition. 235204076Spjd * local=3 remote=3 local=4 remote=3 Secondary out-of-date, 236204076Spjd * regular sync from primary. 237204076Spjd * local=3 remote=3 local=4 remote=4* ?! Full sync from primary. 238204076Spjd */ 239204076Spjd if (res->hr_resuid == 0) { 240204076Spjd /* 241204076Spjd * Provider is used for the first time. Initialize everything. 242204076Spjd */ 243204076Spjd assert(res->hr_secondary_localcnt == 0); 244204076Spjd res->hr_resuid = resuid; 245204076Spjd if (metadata_write(res) < 0) 246204076Spjd exit(EX_NOINPUT); 247204076Spjd memset(map, 0xff, mapsize); 248204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 249204076Spjd } else if ( 250204076Spjd /* Is primary is out-of-date? */ 251204076Spjd (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 252204076Spjd res->hr_secondary_remotecnt == res->hr_primary_localcnt) || 253204076Spjd /* Node are more or less in sync? */ 254204076Spjd (res->hr_secondary_localcnt == res->hr_primary_remotecnt && 255204076Spjd res->hr_secondary_remotecnt == res->hr_primary_localcnt) || 256204076Spjd /* Is secondary is out-of-date? */ 257204076Spjd (res->hr_secondary_localcnt == res->hr_primary_remotecnt && 258204076Spjd res->hr_secondary_remotecnt < res->hr_primary_localcnt)) { 259204076Spjd /* 260204076Spjd * Nodes are more or less in sync or one of the nodes is 261204076Spjd * out-of-date. 262204076Spjd * It doesn't matter at this point which one, we just have to 263204076Spjd * send out local bitmap to the remote node. 264204076Spjd */ 265204076Spjd if (pread(res->hr_localfd, map, mapsize, METADATA_SIZE) != 266204076Spjd (ssize_t)mapsize) { 267204076Spjd pjdlog_exit(LOG_ERR, "Unable to read activemap"); 268204076Spjd } 269204076Spjd if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 270204076Spjd res->hr_secondary_remotecnt == res->hr_primary_localcnt) { 271204076Spjd /* Primary is out-of-date, sync from secondary. */ 272204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_SECONDARY, "syncsrc"); 273204076Spjd } else { 274204076Spjd /* 275204076Spjd * Secondary is out-of-date or counts match. 276204076Spjd * Sync from primary. 277204076Spjd */ 278204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 279204076Spjd } 280204076Spjd } else if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 281204076Spjd res->hr_primary_localcnt > res->hr_secondary_remotecnt) { 282204076Spjd /* 283204076Spjd * Not good, we have split-brain condition. 284204076Spjd */ 285204076Spjd pjdlog_error("Split-brain detected, exiting."); 286204076Spjd nv_add_string(nvout, "Split-brain condition!", "errmsg"); 287204076Spjd free(map); 288204076Spjd map = NULL; 289204076Spjd mapsize = 0; 290204076Spjd } else /* if (res->hr_secondary_localcnt < res->hr_primary_remotecnt || 291204076Spjd res->hr_primary_localcnt < res->hr_secondary_remotecnt) */ { 292204076Spjd /* 293204076Spjd * This should never happen in practise, but we will perform 294204076Spjd * full synchronization. 295204076Spjd */ 296204076Spjd assert(res->hr_secondary_localcnt < res->hr_primary_remotecnt || 297204076Spjd res->hr_primary_localcnt < res->hr_secondary_remotecnt); 298204076Spjd mapsize = activemap_calc_ondisk_size(res->hr_local_mediasize - 299204076Spjd METADATA_SIZE, res->hr_extentsize, 300204076Spjd res->hr_local_sectorsize); 301204076Spjd memset(map, 0xff, mapsize); 302204076Spjd if (res->hr_secondary_localcnt > res->hr_primary_remotecnt) { 303204076Spjd /* In this one of five cases sync from secondary. */ 304204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_SECONDARY, "syncsrc"); 305204076Spjd } else { 306204076Spjd /* For the rest four cases sync from primary. */ 307204076Spjd nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc"); 308204076Spjd } 309204076Spjd pjdlog_warning("This should never happen, asking for full synchronization (primary(local=%ju, remote=%ju), secondary(local=%ju, remote=%ju)).", 310204076Spjd (uintmax_t)res->hr_primary_localcnt, 311204076Spjd (uintmax_t)res->hr_primary_remotecnt, 312204076Spjd (uintmax_t)res->hr_secondary_localcnt, 313204076Spjd (uintmax_t)res->hr_secondary_remotecnt); 314204076Spjd } 315204076Spjd if (hast_proto_send(res, res->hr_remotein, nvout, map, mapsize) < 0) { 316204076Spjd pjdlog_errno(LOG_WARNING, "Unable to send activemap to %s", 317204076Spjd res->hr_remoteaddr); 318204076Spjd nv_free(nvout); 319204076Spjd exit(EX_TEMPFAIL); 320204076Spjd } 321209182Spjd nv_free(nvout); 322204076Spjd if (res->hr_secondary_localcnt > res->hr_primary_remotecnt && 323204076Spjd res->hr_primary_localcnt > res->hr_secondary_remotecnt) { 324204076Spjd /* Exit on split-brain. */ 325204076Spjd exit(EX_CONFIG); 326204076Spjd } 327204076Spjd} 328204076Spjd 329204076Spjdvoid 330204076Spjdhastd_secondary(struct hast_resource *res, struct nv *nvin) 331204076Spjd{ 332204076Spjd pthread_t td; 333204076Spjd pid_t pid; 334204076Spjd int error; 335204076Spjd 336204076Spjd /* 337204076Spjd * Create communication channel between parent and child. 338204076Spjd */ 339204076Spjd if (proto_client("socketpair://", &res->hr_ctrl) < 0) { 340204076Spjd KEEP_ERRNO((void)pidfile_remove(pfh)); 341204076Spjd pjdlog_exit(EX_OSERR, 342204076Spjd "Unable to create control sockets between parent and child"); 343204076Spjd } 344204076Spjd 345204076Spjd pid = fork(); 346204076Spjd if (pid < 0) { 347204076Spjd KEEP_ERRNO((void)pidfile_remove(pfh)); 348204076Spjd pjdlog_exit(EX_OSERR, "Unable to fork"); 349204076Spjd } 350204076Spjd 351204076Spjd if (pid > 0) { 352204076Spjd /* This is parent. */ 353204076Spjd proto_close(res->hr_remotein); 354204076Spjd res->hr_remotein = NULL; 355204076Spjd proto_close(res->hr_remoteout); 356204076Spjd res->hr_remoteout = NULL; 357204076Spjd res->hr_workerpid = pid; 358204076Spjd return; 359204076Spjd } 360204076Spjd (void)pidfile_close(pfh); 361204076Spjd 362204076Spjd setproctitle("%s (secondary)", res->hr_name); 363204076Spjd 364210880Spjd signal(SIGHUP, SIG_DFL); 365210880Spjd signal(SIGCHLD, SIG_DFL); 366210880Spjd 367207371Spjd /* Error in setting timeout is not critical, but why should it fail? */ 368207371Spjd if (proto_timeout(res->hr_remotein, 0) < 0) 369207371Spjd pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 370207371Spjd if (proto_timeout(res->hr_remoteout, res->hr_timeout) < 0) 371207371Spjd pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 372207371Spjd 373204076Spjd init_local(res); 374204076Spjd init_remote(res, nvin); 375204076Spjd init_environment(); 376204076Spjd 377204076Spjd error = pthread_create(&td, NULL, recv_thread, res); 378204076Spjd assert(error == 0); 379204076Spjd error = pthread_create(&td, NULL, disk_thread, res); 380204076Spjd assert(error == 0); 381204076Spjd error = pthread_create(&td, NULL, send_thread, res); 382204076Spjd assert(error == 0); 383204076Spjd (void)ctrl_thread(res); 384204076Spjd} 385204076Spjd 386204076Spjdstatic void 387204076Spjdreqlog(int loglevel, int debuglevel, int error, struct hio *hio, const char *fmt, ...) 388204076Spjd{ 389204076Spjd char msg[1024]; 390204076Spjd va_list ap; 391204076Spjd int len; 392204076Spjd 393204076Spjd va_start(ap, fmt); 394204076Spjd len = vsnprintf(msg, sizeof(msg), fmt, ap); 395204076Spjd va_end(ap); 396204076Spjd if ((size_t)len < sizeof(msg)) { 397204076Spjd switch (hio->hio_cmd) { 398204076Spjd case HIO_READ: 399204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 400204076Spjd "READ(%ju, %ju).", (uintmax_t)hio->hio_offset, 401204076Spjd (uintmax_t)hio->hio_length); 402204076Spjd break; 403204076Spjd case HIO_DELETE: 404204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 405204076Spjd "DELETE(%ju, %ju).", (uintmax_t)hio->hio_offset, 406204076Spjd (uintmax_t)hio->hio_length); 407204076Spjd break; 408204076Spjd case HIO_FLUSH: 409204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, "FLUSH."); 410204076Spjd break; 411204076Spjd case HIO_WRITE: 412204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 413204076Spjd "WRITE(%ju, %ju).", (uintmax_t)hio->hio_offset, 414204076Spjd (uintmax_t)hio->hio_length); 415204076Spjd break; 416211882Spjd case HIO_KEEPALIVE: 417211882Spjd (void)snprintf(msg + len, sizeof(msg) - len, "KEEPALIVE."); 418211882Spjd break; 419204076Spjd default: 420204076Spjd (void)snprintf(msg + len, sizeof(msg) - len, 421204076Spjd "UNKNOWN(%u).", (unsigned int)hio->hio_cmd); 422204076Spjd break; 423204076Spjd } 424204076Spjd } 425204076Spjd pjdlog_common(loglevel, debuglevel, error, "%s", msg); 426204076Spjd} 427204076Spjd 428204076Spjdstatic int 429204076Spjdrequnpack(struct hast_resource *res, struct hio *hio) 430204076Spjd{ 431204076Spjd 432204076Spjd hio->hio_cmd = nv_get_uint8(hio->hio_nv, "cmd"); 433204076Spjd if (hio->hio_cmd == 0) { 434204076Spjd pjdlog_error("Header contains no 'cmd' field."); 435204076Spjd hio->hio_error = EINVAL; 436204076Spjd goto end; 437204076Spjd } 438204076Spjd switch (hio->hio_cmd) { 439211882Spjd case HIO_KEEPALIVE: 440211882Spjd break; 441204076Spjd case HIO_READ: 442204076Spjd case HIO_WRITE: 443204076Spjd case HIO_DELETE: 444204076Spjd hio->hio_offset = nv_get_uint64(hio->hio_nv, "offset"); 445204076Spjd if (nv_error(hio->hio_nv) != 0) { 446204076Spjd pjdlog_error("Header is missing 'offset' field."); 447204076Spjd hio->hio_error = EINVAL; 448204076Spjd goto end; 449204076Spjd } 450204076Spjd hio->hio_length = nv_get_uint64(hio->hio_nv, "length"); 451204076Spjd if (nv_error(hio->hio_nv) != 0) { 452204076Spjd pjdlog_error("Header is missing 'length' field."); 453204076Spjd hio->hio_error = EINVAL; 454204076Spjd goto end; 455204076Spjd } 456204076Spjd if (hio->hio_length == 0) { 457204076Spjd pjdlog_error("Data length is zero."); 458204076Spjd hio->hio_error = EINVAL; 459204076Spjd goto end; 460204076Spjd } 461204076Spjd if (hio->hio_length > MAXPHYS) { 462204076Spjd pjdlog_error("Data length is too large (%ju > %ju).", 463204076Spjd (uintmax_t)hio->hio_length, (uintmax_t)MAXPHYS); 464204076Spjd hio->hio_error = EINVAL; 465204076Spjd goto end; 466204076Spjd } 467204076Spjd if ((hio->hio_offset % res->hr_local_sectorsize) != 0) { 468204076Spjd pjdlog_error("Offset %ju is not multiple of sector size.", 469204076Spjd (uintmax_t)hio->hio_offset); 470204076Spjd hio->hio_error = EINVAL; 471204076Spjd goto end; 472204076Spjd } 473204076Spjd if ((hio->hio_length % res->hr_local_sectorsize) != 0) { 474204076Spjd pjdlog_error("Length %ju is not multiple of sector size.", 475204076Spjd (uintmax_t)hio->hio_length); 476204076Spjd hio->hio_error = EINVAL; 477204076Spjd goto end; 478204076Spjd } 479204076Spjd if (hio->hio_offset + hio->hio_length > 480204076Spjd (uint64_t)res->hr_datasize) { 481204076Spjd pjdlog_error("Data offset is too large (%ju > %ju).", 482204076Spjd (uintmax_t)(hio->hio_offset + hio->hio_length), 483204076Spjd (uintmax_t)res->hr_datasize); 484204076Spjd hio->hio_error = EINVAL; 485204076Spjd goto end; 486204076Spjd } 487204076Spjd break; 488204076Spjd default: 489204076Spjd pjdlog_error("Header contains invalid 'cmd' (%hhu).", 490204076Spjd hio->hio_cmd); 491204076Spjd hio->hio_error = EINVAL; 492204076Spjd goto end; 493204076Spjd } 494204076Spjd hio->hio_error = 0; 495204076Spjdend: 496204076Spjd return (hio->hio_error); 497204076Spjd} 498204076Spjd 499204076Spjd/* 500204076Spjd * Thread receives requests from the primary node. 501204076Spjd */ 502204076Spjdstatic void * 503204076Spjdrecv_thread(void *arg) 504204076Spjd{ 505204076Spjd struct hast_resource *res = arg; 506204076Spjd struct hio *hio; 507204076Spjd 508204076Spjd for (;;) { 509204076Spjd pjdlog_debug(2, "recv: Taking free request."); 510211877Spjd QUEUE_TAKE(free, hio); 511204076Spjd pjdlog_debug(2, "recv: (%p) Got request.", hio); 512204076Spjd if (hast_proto_recv_hdr(res->hr_remotein, &hio->hio_nv) < 0) { 513204076Spjd pjdlog_exit(EX_TEMPFAIL, 514204076Spjd "Unable to receive request header"); 515204076Spjd } 516211877Spjd if (requnpack(res, hio) != 0) { 517211877Spjd pjdlog_debug(2, 518211877Spjd "recv: (%p) Moving request to the send queue.", 519211877Spjd hio); 520211877Spjd QUEUE_INSERT(send, hio); 521211877Spjd continue; 522211877Spjd } 523204076Spjd reqlog(LOG_DEBUG, 2, -1, hio, 524204076Spjd "recv: (%p) Got request header: ", hio); 525211882Spjd if (hio->hio_cmd == HIO_KEEPALIVE) { 526211882Spjd pjdlog_debug(2, 527211882Spjd "recv: (%p) Moving request to the free queue.", 528211882Spjd hio); 529211882Spjd nv_free(hio->hio_nv); 530211882Spjd QUEUE_INSERT(free, hio); 531211882Spjd continue; 532211882Spjd } else if (hio->hio_cmd == HIO_WRITE) { 533204076Spjd if (hast_proto_recv_data(res, res->hr_remotein, 534204076Spjd hio->hio_nv, hio->hio_data, MAXPHYS) < 0) { 535204076Spjd pjdlog_exit(EX_TEMPFAIL, 536204076Spjd "Unable to receive reply data"); 537204076Spjd } 538204076Spjd } 539204076Spjd pjdlog_debug(2, "recv: (%p) Moving request to the disk queue.", 540204076Spjd hio); 541211877Spjd QUEUE_INSERT(disk, hio); 542204076Spjd } 543204076Spjd /* NOTREACHED */ 544204076Spjd return (NULL); 545204076Spjd} 546204076Spjd 547204076Spjd/* 548204076Spjd * Thread reads from or writes to local component and also handles DELETE and 549204076Spjd * FLUSH requests. 550204076Spjd */ 551204076Spjdstatic void * 552204076Spjddisk_thread(void *arg) 553204076Spjd{ 554204076Spjd struct hast_resource *res = arg; 555204076Spjd struct hio *hio; 556204076Spjd ssize_t ret; 557211877Spjd bool clear_activemap; 558204076Spjd 559204076Spjd clear_activemap = true; 560204076Spjd 561204076Spjd for (;;) { 562204076Spjd pjdlog_debug(2, "disk: Taking request."); 563211877Spjd QUEUE_TAKE(disk, hio); 564204076Spjd while (clear_activemap) { 565204076Spjd unsigned char *map; 566204076Spjd size_t mapsize; 567204076Spjd 568204076Spjd /* 569204076Spjd * When first request is received, it means that primary 570204076Spjd * already received our activemap, merged it and stored 571204076Spjd * locally. We can now safely clear our activemap. 572204076Spjd */ 573204076Spjd mapsize = 574204076Spjd activemap_calc_ondisk_size(res->hr_local_mediasize - 575204076Spjd METADATA_SIZE, res->hr_extentsize, 576204076Spjd res->hr_local_sectorsize); 577204076Spjd map = calloc(1, mapsize); 578204076Spjd if (map == NULL) { 579204076Spjd pjdlog_warning("Unable to allocate memory to clear local activemap."); 580204076Spjd break; 581204076Spjd } 582204076Spjd if (pwrite(res->hr_localfd, map, mapsize, 583204076Spjd METADATA_SIZE) != (ssize_t)mapsize) { 584204076Spjd pjdlog_errno(LOG_WARNING, 585204076Spjd "Unable to store cleared activemap"); 586204076Spjd free(map); 587204076Spjd break; 588204076Spjd } 589204076Spjd free(map); 590204076Spjd clear_activemap = false; 591204076Spjd pjdlog_debug(1, "Local activemap cleared."); 592204076Spjd } 593204076Spjd reqlog(LOG_DEBUG, 2, -1, hio, "disk: (%p) Got request: ", hio); 594204076Spjd /* Handle the actual request. */ 595204076Spjd switch (hio->hio_cmd) { 596204076Spjd case HIO_READ: 597204076Spjd ret = pread(res->hr_localfd, hio->hio_data, 598204076Spjd hio->hio_length, 599204076Spjd hio->hio_offset + res->hr_localoff); 600204076Spjd if (ret < 0) 601204076Spjd hio->hio_error = errno; 602204076Spjd else if (ret != (int64_t)hio->hio_length) 603204076Spjd hio->hio_error = EIO; 604204076Spjd else 605204076Spjd hio->hio_error = 0; 606204076Spjd break; 607204076Spjd case HIO_WRITE: 608204076Spjd ret = pwrite(res->hr_localfd, hio->hio_data, 609204076Spjd hio->hio_length, 610204076Spjd hio->hio_offset + res->hr_localoff); 611204076Spjd if (ret < 0) 612204076Spjd hio->hio_error = errno; 613204076Spjd else if (ret != (int64_t)hio->hio_length) 614204076Spjd hio->hio_error = EIO; 615204076Spjd else 616204076Spjd hio->hio_error = 0; 617204076Spjd break; 618204076Spjd case HIO_DELETE: 619204076Spjd ret = g_delete(res->hr_localfd, 620204076Spjd hio->hio_offset + res->hr_localoff, 621204076Spjd hio->hio_length); 622204076Spjd if (ret < 0) 623204076Spjd hio->hio_error = errno; 624204076Spjd else 625204076Spjd hio->hio_error = 0; 626204076Spjd break; 627204076Spjd case HIO_FLUSH: 628204076Spjd ret = g_flush(res->hr_localfd); 629204076Spjd if (ret < 0) 630204076Spjd hio->hio_error = errno; 631204076Spjd else 632204076Spjd hio->hio_error = 0; 633204076Spjd break; 634204076Spjd } 635204076Spjd if (hio->hio_error != 0) { 636204076Spjd reqlog(LOG_ERR, 0, hio->hio_error, hio, 637204076Spjd "Request failed: "); 638204076Spjd } 639204076Spjd pjdlog_debug(2, "disk: (%p) Moving request to the send queue.", 640204076Spjd hio); 641211877Spjd QUEUE_INSERT(send, hio); 642204076Spjd } 643204076Spjd /* NOTREACHED */ 644204076Spjd return (NULL); 645204076Spjd} 646204076Spjd 647204076Spjd/* 648204076Spjd * Thread sends requests back to primary node. 649204076Spjd */ 650204076Spjdstatic void * 651204076Spjdsend_thread(void *arg) 652204076Spjd{ 653204076Spjd struct hast_resource *res = arg; 654204076Spjd struct nv *nvout; 655204076Spjd struct hio *hio; 656204076Spjd void *data; 657204076Spjd size_t length; 658204076Spjd 659204076Spjd for (;;) { 660204076Spjd pjdlog_debug(2, "send: Taking request."); 661211877Spjd QUEUE_TAKE(send, hio); 662204076Spjd reqlog(LOG_DEBUG, 2, -1, hio, "send: (%p) Got request: ", hio); 663204076Spjd nvout = nv_alloc(); 664204076Spjd /* Copy sequence number. */ 665204076Spjd nv_add_uint64(nvout, nv_get_uint64(hio->hio_nv, "seq"), "seq"); 666204076Spjd switch (hio->hio_cmd) { 667204076Spjd case HIO_READ: 668204076Spjd if (hio->hio_error == 0) { 669204076Spjd data = hio->hio_data; 670204076Spjd length = hio->hio_length; 671204076Spjd break; 672204076Spjd } 673204076Spjd /* 674204076Spjd * We send no data in case of an error. 675204076Spjd */ 676204076Spjd /* FALLTHROUGH */ 677204076Spjd case HIO_DELETE: 678204076Spjd case HIO_FLUSH: 679204076Spjd case HIO_WRITE: 680204076Spjd data = NULL; 681204076Spjd length = 0; 682204076Spjd break; 683204076Spjd default: 684204076Spjd abort(); 685204076Spjd break; 686204076Spjd } 687204076Spjd if (hio->hio_error != 0) 688204076Spjd nv_add_int16(nvout, hio->hio_error, "error"); 689204076Spjd if (hast_proto_send(res, res->hr_remoteout, nvout, data, 690204076Spjd length) < 0) { 691204076Spjd pjdlog_exit(EX_TEMPFAIL, "Unable to send reply."); 692204076Spjd } 693204076Spjd nv_free(nvout); 694209185Spjd pjdlog_debug(2, "send: (%p) Moving request to the free queue.", 695204076Spjd hio); 696204076Spjd nv_free(hio->hio_nv); 697204076Spjd hio->hio_error = 0; 698211877Spjd QUEUE_INSERT(free, hio); 699204076Spjd } 700204076Spjd /* NOTREACHED */ 701204076Spjd return (NULL); 702204076Spjd} 703