client.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <limits.h>
   5 #include <errno.h>
   6 #include <fcntl.h>
   7 #include <sys/poll.h>
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <sys/wait.h>
  11 #include <sys/socket.h>
  12 #include <sys/un.h>
  13 #include <netinet/in.h>
  14 #include <arpa/inet.h>
  15 #include <netdb.h>
  16 #include <signal.h>
  17 #include <zlib.h>
  18
  19 #include "fio.h"
  20 #include "client.h"
  21 #include "server.h"
  22 #include "flist.h"
  23 #include "hash.h"
  24
  25 static void handle_du(struct fio_client *client, struct fio_net_cmd *cmd);
  26 static void handle_ts(struct fio_client *client, struct fio_net_cmd *cmd);
  27 static void handle_gs(struct fio_client *client, struct fio_net_cmd *cmd);
  28 static void handle_probe(struct fio_client *client, struct fio_net_cmd *cmd);
  29 static void handle_text(struct fio_client *client, struct fio_net_cmd *cmd);
  30 static void handle_stop(struct fio_client *client, struct fio_net_cmd *cmd);
  31 static void handle_start(struct fio_client *client, struct fio_net_cmd *cmd);
  32
  33 struct client_ops fio_client_ops = {
  34         .text           = handle_text,
  35         .disk_util      = handle_du,
  36         .thread_status  = handle_ts,
  37         .group_stats    = handle_gs,
  38         .stop           = handle_stop,
  39         .start          = handle_start,
  40         .eta            = display_thread_status,
  41         .probe          = handle_probe,
  42         .eta_msec       = FIO_CLIENT_DEF_ETA_MSEC,
  43         .client_type    = FIO_CLIENT_TYPE_CLI,
  44 };
  45
  46 static struct timeval eta_tv;
  47
  48 static FLIST_HEAD(client_list);
  49 static FLIST_HEAD(eta_list);
  50
  51 static FLIST_HEAD(arg_list);
  52
  53 struct thread_stat client_ts;
  54 struct group_run_stats client_gs;
  55 int sum_stat_clients;
  56
  57 static int sum_stat_nr;
  58 static int do_output_all_clients;
  59
  60 #define FIO_CLIENT_HASH_BITS    7
  61 #define FIO_CLIENT_HASH_SZ      (1 << FIO_CLIENT_HASH_BITS)
  62 #define FIO_CLIENT_HASH_MASK    (FIO_CLIENT_HASH_SZ - 1)
  63 static struct flist_head client_hash[FIO_CLIENT_HASH_SZ];
  64
  65 static void fio_client_add_hash(struct fio_client *client)
  66 {
  67         int bucket = hash_long(client->fd, FIO_CLIENT_HASH_BITS);
  68
  69         bucket &= FIO_CLIENT_HASH_MASK;
  70         flist_add(&client->hash_list, &client_hash[bucket]);
  71 }
  72
  73 static void fio_client_remove_hash(struct fio_client *client)
  74 {
  75         if (!flist_empty(&client->hash_list))
  76                 flist_del_init(&client->hash_list);
  77 }
  78
  79 static void fio_init fio_client_hash_init(void)
  80 {
  81         int i;
  82
  83         for (i = 0; i < FIO_CLIENT_HASH_SZ; i++)
  84                 INIT_FLIST_HEAD(&client_hash[i]);
  85 }
  86
  87 static struct fio_client *find_client_by_fd(int fd)
  88 {
  89         int bucket = hash_long(fd, FIO_CLIENT_HASH_BITS) & FIO_CLIENT_HASH_MASK;
  90         struct fio_client *client;
  91         struct flist_head *entry;
  92
  93         flist_for_each(entry, &client_hash[bucket]) {
  94                 client = flist_entry(entry, struct fio_client, hash_list);
  95
  96                 if (client->fd == fd) {
  97                         client->refs++;
  98                         return client;
  99                 }
 100         }
 101
 102         return NULL;
 103 }
 104
 105 void fio_put_client(struct fio_client *client)
 106 {
 107         if (--client->refs)
 108                 return;
 109
 110         free(client->hostname);
 111         if (client->argv)
 112                 free(client->argv);
 113         if (client->name)
 114                 free(client->name);
 115         while (client->nr_ini_file)
 116                 free(client->ini_file[--client->nr_ini_file]);
 117         if (client->ini_file)
 118                 free(client->ini_file);
 119
 120         if (!client->did_stat)
 121                 sum_stat_clients -= client->nr_stat;
 122
 123         free(client);
 124 }
 125
 126 static void remove_client(struct fio_client *client)
 127 {
 128         assert(client->refs);
 129
 130         dprint(FD_NET, "client: removed <%s>\n", client->hostname);
 131
 132         if (!flist_empty(&client->list))
 133                 flist_del_init(&client->list);
 134
 135         fio_client_remove_hash(client);
 136
 137         if (!flist_empty(&client->eta_list)) {
 138                 flist_del_init(&client->eta_list);
 139                 fio_client_dec_jobs_eta(client->eta_in_flight, client->ops->eta);
 140         }
 141
 142         close(client->fd);
 143         client->fd = -1;
 144
 145         if (client->ops->removed)
 146                 client->ops->removed(client);
 147
 148         nr_clients--;
 149         fio_put_client(client);
 150 }
 151
 152 struct fio_client *fio_get_client(struct fio_client *client)
 153 {
 154         client->refs++;
 155         return client;
 156 }
 157
 158 static void __fio_client_add_cmd_option(struct fio_client *client,
 159                                         const char *opt)
 160 {
 161         int index;
 162
 163         index = client->argc++;
 164         client->argv = realloc(client->argv, sizeof(char *) * client->argc);
 165         client->argv[index] = strdup(opt);
 166         dprint(FD_NET, "client: add cmd %d: %s\n", index, opt);
 167 }
 168
 169 void fio_client_add_cmd_option(void *cookie, const char *opt)
 170 {
 171         struct fio_client *client = cookie;
 172         struct flist_head *entry;
 173
 174         if (!client || !opt)
 175                 return;
 176
 177         __fio_client_add_cmd_option(client, opt);
 178
 179         /*
 180          * Duplicate arguments to shared client group
 181          */
 182         flist_for_each(entry, &arg_list) {
 183                 client = flist_entry(entry, struct fio_client, arg_list);
 184
 185                 __fio_client_add_cmd_option(client, opt);
 186         }
 187 }
 188
 189 struct fio_client *fio_client_add_explicit(struct client_ops *ops,
 190                                            const char *hostname, int type,
 191                                            int port)
 192 {
 193         struct fio_client *client;
 194
 195         client = malloc(sizeof(*client));
 196         memset(client, 0, sizeof(*client));
 197
 198         INIT_FLIST_HEAD(&client->list);
 199         INIT_FLIST_HEAD(&client->hash_list);
 200         INIT_FLIST_HEAD(&client->arg_list);
 201         INIT_FLIST_HEAD(&client->eta_list);
 202         INIT_FLIST_HEAD(&client->cmd_list);
 203
 204         client->hostname = strdup(hostname);
 205
 206         if (type == Fio_client_socket)
 207                 client->is_sock = 1;
 208         else {
 209                 int ipv6;
 210
 211                 ipv6 = type == Fio_client_ipv6;
 212                 if (fio_server_parse_host(hostname, &ipv6,
 213                                                 &client->addr.sin_addr,
 214                                                 &client->addr6.sin6_addr))
 215                         goto err;
 216
 217                 client->port = port;
 218         }
 219
 220         client->fd = -1;
 221         client->ops = ops;
 222         client->refs = 1;
 223         client->type = ops->client_type;
 224
 225         __fio_client_add_cmd_option(client, "fio");
 226
 227         flist_add(&client->list, &client_list);
 228         nr_clients++;
 229         dprint(FD_NET, "client: added <%s>\n", client->hostname);
 230         return client;
 231 err:
 232         free(client);
 233         return NULL;
 234 }
 235
 236 void fio_client_add_ini_file(void *cookie, const char *ini_file)
 237 {
 238         struct fio_client *client = cookie;
 239         size_t new_size;
 240
 241         dprint(FD_NET, "client <%s>: add ini %s\n", client->hostname, ini_file);
 242
 243         new_size = (client->nr_ini_file + 1) * sizeof(char *);
 244         client->ini_file = realloc(client->ini_file, new_size);
 245         client->ini_file[client->nr_ini_file] = strdup(ini_file);
 246         client->nr_ini_file++;
 247 }
 248
 249 int fio_client_add(struct client_ops *ops, const char *hostname, void **cookie)
 250 {
 251         struct fio_client *existing = *cookie;
 252         struct fio_client *client;
 253
 254         if (existing) {
 255                 /*
 256                  * We always add our "exec" name as the option, hence 1
 257                  * means empty.
 258                  */
 259                 if (existing->argc == 1)
 260                         flist_add_tail(&existing->arg_list, &arg_list);
 261                 else {
 262                         while (!flist_empty(&arg_list))
 263                                 flist_del_init(arg_list.next);
 264                 }
 265         }
 266
 267         client = malloc(sizeof(*client));
 268         memset(client, 0, sizeof(*client));
 269
 270         INIT_FLIST_HEAD(&client->list);
 271         INIT_FLIST_HEAD(&client->hash_list);
 272         INIT_FLIST_HEAD(&client->arg_list);
 273         INIT_FLIST_HEAD(&client->eta_list);
 274         INIT_FLIST_HEAD(&client->cmd_list);
 275
 276         if (fio_server_parse_string(hostname, &client->hostname,
 277                                         &client->is_sock, &client->port,
 278                                         &client->addr.sin_addr,
 279                                         &client->addr6.sin6_addr,
 280                                         &client->ipv6))
 281                 return -1;
 282
 283         client->fd = -1;
 284         client->ops = ops;
 285         client->refs = 1;
 286         client->type = ops->client_type;
 287
 288         __fio_client_add_cmd_option(client, "fio");
 289
 290         flist_add(&client->list, &client_list);
 291         nr_clients++;
 292         dprint(FD_NET, "client: added <%s>\n", client->hostname);
 293         *cookie = client;
 294         return 0;
 295 }
 296
 297 static void probe_client(struct fio_client *client)
 298 {
 299         dprint(FD_NET, "client: send probe\n");
 300
 301         fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_PROBE, 0, &client->cmd_list);
 302 }
 303
 304 static int fio_client_connect_ip(struct fio_client *client)
 305 {
 306         struct sockaddr *addr;
 307         fio_socklen_t socklen;
 308         int fd, domain;
 309
 310         if (client->ipv6) {
 311                 client->addr6.sin6_family = AF_INET6;
 312                 client->addr6.sin6_port = htons(client->port);
 313                 domain = AF_INET6;
 314                 addr = (struct sockaddr *) &client->addr6;
 315                 socklen = sizeof(client->addr6);
 316         } else {
 317                 client->addr.sin_family = AF_INET;
 318                 client->addr.sin_port = htons(client->port);
 319                 domain = AF_INET;
 320                 addr = (struct sockaddr *) &client->addr;
 321                 socklen = sizeof(client->addr);
 322         }
 323
 324         fd = socket(domain, SOCK_STREAM, 0);
 325         if (fd < 0) {
 326                 int ret = -errno;
 327
 328                 log_err("fio: socket: %s\n", strerror(errno));
 329                 return ret;
 330         }
 331
 332         if (connect(fd, addr, socklen) < 0) {
 333                 int ret = -errno;
 334
 335                 log_err("fio: connect: %s\n", strerror(errno));
 336                 log_err("fio: failed to connect to %s:%u\n", client->hostname,
 337                                                                 client->port);
 338                 close(fd);
 339                 return ret;
 340         }
 341
 342         return fd;
 343 }
 344
 345 static int fio_client_connect_sock(struct fio_client *client)
 346 {
 347         struct sockaddr_un *addr = &client->addr_un;
 348         fio_socklen_t len;
 349         int fd;
 350
 351         memset(addr, 0, sizeof(*addr));
 352         addr->sun_family = AF_UNIX;
 353         strcpy(addr->sun_path, client->hostname);
 354
 355         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 356         if (fd < 0) {
 357                 int ret = -errno;
 358
 359                 log_err("fio: socket: %s\n", strerror(errno));
 360                 return ret;
 361         }
 362
 363         len = sizeof(addr->sun_family) + strlen(addr->sun_path) + 1;
 364         if (connect(fd, (struct sockaddr *) addr, len) < 0) {
 365                 int ret = -errno;
 366
 367                 log_err("fio: connect; %s\n", strerror(errno));
 368                 close(fd);
 369                 return ret;
 370         }
 371
 372         return fd;
 373 }
 374
 375 int fio_client_connect(struct fio_client *client)
 376 {
 377         int fd;
 378
 379         dprint(FD_NET, "client: connect to host %s\n", client->hostname);
 380
 381         if (client->is_sock)
 382                 fd = fio_client_connect_sock(client);
 383         else
 384                 fd = fio_client_connect_ip(client);
 385
 386         dprint(FD_NET, "client: %s connected %d\n", client->hostname, fd);
 387
 388         if (fd < 0)
 389                 return fd;
 390
 391         client->fd = fd;
 392         fio_client_add_hash(client);
 393         client->state = Client_connected;
 394
 395         probe_client(client);
 396         return 0;
 397 }
 398
 399 int fio_client_terminate(struct fio_client *client)
 400 {
 401         return fio_net_send_quit(client->fd);
 402 }
 403
 404 void fio_clients_terminate(void)
 405 {
 406         struct flist_head *entry;
 407         struct fio_client *client;
 408
 409         dprint(FD_NET, "client: terminate clients\n");
 410
 411         flist_for_each(entry, &client_list) {
 412                 client = flist_entry(entry, struct fio_client, list);
 413                 fio_client_terminate(client);
 414         }
 415 }
 416
 417 static void sig_int(int sig)
 418 {
 419         dprint(FD_NET, "client: got signal %d\n", sig);
 420         fio_clients_terminate();
 421 }
 422
 423 static void sig_show_status(int sig)
 424 {
 425         show_running_run_stats();
 426 }
 427
 428 static void client_signal_handler(void)
 429 {
 430         struct sigaction act;
 431
 432         memset(&act, 0, sizeof(act));
 433         act.sa_handler = sig_int;
 434         act.sa_flags = SA_RESTART;
 435         sigaction(SIGINT, &act, NULL);
 436
 437         memset(&act, 0, sizeof(act));
 438         act.sa_handler = sig_int;
 439         act.sa_flags = SA_RESTART;
 440         sigaction(SIGTERM, &act, NULL);
 441
 442 /* Windows uses SIGBREAK as a quit signal from other applications */
 443 #ifdef WIN32
 444         memset(&act, 0, sizeof(act));
 445         act.sa_handler = sig_int;
 446         act.sa_flags = SA_RESTART;
 447         sigaction(SIGBREAK, &act, NULL);
 448 #endif
 449
 450         memset(&act, 0, sizeof(act));
 451         act.sa_handler = sig_show_status;
 452         act.sa_flags = SA_RESTART;
 453         sigaction(SIGUSR1, &act, NULL);
 454 }
 455
 456 static int send_client_cmd_line(struct fio_client *client)
 457 {
 458         struct cmd_single_line_pdu *cslp;
 459         struct cmd_line_pdu *clp;
 460         unsigned long offset;
 461         unsigned int *lens;
 462         void *pdu;
 463         size_t mem;
 464         int i, ret;
 465
 466         dprint(FD_NET, "client: send cmdline %d\n", client->argc);
 467
 468         lens = malloc(client->argc * sizeof(unsigned int));
 469
 470         /*
 471          * Find out how much mem we need
 472          */
 473         for (i = 0, mem = 0; i < client->argc; i++) {
 474                 lens[i] = strlen(client->argv[i]) + 1;
 475                 mem += lens[i];
 476         }
 477
 478         /*
 479          * We need one cmd_line_pdu, and argc number of cmd_single_line_pdu
 480          */
 481         mem += sizeof(*clp) + (client->argc * sizeof(*cslp));
 482
 483         pdu = malloc(mem);
 484         clp = pdu;
 485         offset = sizeof(*clp);
 486
 487         for (i = 0; i < client->argc; i++) {
 488                 uint16_t arg_len = lens[i];
 489
 490                 cslp = pdu + offset;
 491                 strcpy((char *) cslp->text, client->argv[i]);
 492                 cslp->len = cpu_to_le16(arg_len);
 493                 offset += sizeof(*cslp) + arg_len;
 494         }
 495
 496         free(lens);
 497         clp->lines = cpu_to_le16(client->argc);
 498         clp->client_type = __cpu_to_le16(client->type);
 499         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOBLINE, pdu, mem, NULL, NULL);
 500         free(pdu);
 501         return ret;
 502 }
 503
 504 int fio_clients_connect(void)
 505 {
 506         struct fio_client *client;
 507         struct flist_head *entry, *tmp;
 508         int ret;
 509
 510 #ifdef WIN32
 511         WSADATA wsd;
 512         WSAStartup(MAKEWORD(2, 2), &wsd);
 513 #endif
 514
 515         dprint(FD_NET, "client: connect all\n");
 516
 517         client_signal_handler();
 518
 519         flist_for_each_safe(entry, tmp, &client_list) {
 520                 client = flist_entry(entry, struct fio_client, list);
 521
 522                 ret = fio_client_connect(client);
 523                 if (ret) {
 524                         remove_client(client);
 525                         continue;
 526                 }
 527
 528                 if (client->argc > 1)
 529                         send_client_cmd_line(client);
 530         }
 531
 532         return !nr_clients;
 533 }
 534
 535 int fio_start_client(struct fio_client *client)
 536 {
 537         dprint(FD_NET, "client: start %s\n", client->hostname);
 538         return fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_RUN, 0, NULL);
 539 }
 540
 541 int fio_start_all_clients(void)
 542 {
 543         struct fio_client *client;
 544         struct flist_head *entry, *tmp;
 545         int ret;
 546
 547         dprint(FD_NET, "client: start all\n");
 548
 549         flist_for_each_safe(entry, tmp, &client_list) {
 550                 client = flist_entry(entry, struct fio_client, list);
 551
 552                 ret = fio_start_client(client);
 553                 if (ret) {
 554                         remove_client(client);
 555                         continue;
 556                 }
 557         }
 558
 559         return flist_empty(&client_list);
 560 }
 561
 562 /*
 563  * Send file contents to server backend. We could use sendfile(), but to remain
 564  * more portable lets just read/write the darn thing.
 565  */
 566 static int __fio_client_send_ini(struct fio_client *client, const char *filename)
 567 {
 568         struct cmd_job_pdu *pdu;
 569         size_t p_size;
 570         struct stat sb;
 571         char *p;
 572         void *buf;
 573         off_t len;
 574         int fd, ret;
 575
 576         dprint(FD_NET, "send ini %s to %s\n", filename, client->hostname);
 577
 578         fd = open(filename, O_RDONLY);
 579         if (fd < 0) {
 580                 int ret = -errno;
 581
 582                 log_err("fio: job file <%s> open: %s\n", filename, strerror(errno));
 583                 return ret;
 584         }
 585
 586         if (fstat(fd, &sb) < 0) {
 587                 int ret = -errno;
 588
 589                 log_err("fio: job file stat: %s\n", strerror(errno));
 590                 close(fd);
 591                 return ret;
 592         }
 593
 594         p_size = sb.st_size + sizeof(*pdu);
 595         pdu = malloc(p_size);
 596         buf = pdu->buf;
 597
 598         len = sb.st_size;
 599         p = buf;
 600         do {
 601                 ret = read(fd, p, len);
 602                 if (ret > 0) {
 603                         len -= ret;
 604                         if (!len)
 605                                 break;
 606                         p += ret;
 607                         continue;
 608                 } else if (!ret)
 609                         break;
 610                 else if (errno == EAGAIN || errno == EINTR)
 611                         continue;
 612         } while (1);
 613
 614         if (len) {
 615                 log_err("fio: failed reading job file %s\n", filename);
 616                 close(fd);
 617                 free(buf);
 618                 return 1;
 619         }
 620
 621         pdu->buf_len = __cpu_to_le32(sb.st_size);
 622         pdu->client_type = cpu_to_le32(client->type);
 623
 624         client->sent_job = 1;
 625         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOB, pdu, p_size, NULL, NULL);
 626         free(pdu);
 627         close(fd);
 628         return ret;
 629 }
 630
 631 int fio_client_send_ini(struct fio_client *client, const char *filename)
 632 {
 633         int ret;
 634
 635         ret = __fio_client_send_ini(client, filename);
 636         if (!ret)
 637                 client->sent_job = 1;
 638
 639         return ret;
 640 }
 641
 642 int fio_clients_send_ini(const char *filename)
 643 {
 644         struct fio_client *client;
 645         struct flist_head *entry, *tmp;
 646
 647         flist_for_each_safe(entry, tmp, &client_list) {
 648                 client = flist_entry(entry, struct fio_client, list);
 649
 650                 if (client->nr_ini_file) {
 651                         int i;
 652
 653                         for (i = 0; i < client->nr_ini_file; i++) {
 654                                 const char *ini = client->ini_file[i];
 655
 656                                 if (fio_client_send_ini(client, ini)) {
 657                                         remove_client(client);
 658                                         break;
 659                                 }
 660                         }
 661                 } else if (!filename || fio_client_send_ini(client, filename))
 662                         remove_client(client);
 663         }
 664
 665         return !nr_clients;
 666 }
 667
 668 int fio_client_update_options(struct fio_client *client,
 669                               struct thread_options *o, uint64_t *tag)
 670 {
 671         struct cmd_add_job_pdu pdu;
 672
 673         pdu.thread_number = cpu_to_le32(client->thread_number);
 674         pdu.groupid = cpu_to_le32(client->groupid);
 675         convert_thread_options_to_net(&pdu.top, o);
 676
 677         return fio_net_send_cmd(client->fd, FIO_NET_CMD_UPDATE_JOB, &pdu, sizeof(pdu), tag, &client->cmd_list);
 678 }
 679
 680 static void convert_io_stat(struct io_stat *dst, struct io_stat *src)
 681 {
 682         dst->max_val    = le64_to_cpu(src->max_val);
 683         dst->min_val    = le64_to_cpu(src->min_val);
 684         dst->samples    = le64_to_cpu(src->samples);
 685
 686         /*
 687          * Floats arrive as IEEE 754 encoded uint64_t, convert back to double
 688          */
 689         dst->mean.u.f   = fio_uint64_to_double(le64_to_cpu(dst->mean.u.i));
 690         dst->S.u.f      = fio_uint64_to_double(le64_to_cpu(dst->S.u.i));
 691 }
 692
 693 static void convert_ts(struct thread_stat *dst, struct thread_stat *src)
 694 {
 695         int i, j;
 696
 697         dst->error              = le32_to_cpu(src->error);
 698         dst->thread_number      = le32_to_cpu(src->thread_number);
 699         dst->groupid            = le32_to_cpu(src->groupid);
 700         dst->pid                = le32_to_cpu(src->pid);
 701         dst->members            = le32_to_cpu(src->members);
 702
 703         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 704                 convert_io_stat(&dst->clat_stat[i], &src->clat_stat[i]);
 705                 convert_io_stat(&dst->slat_stat[i], &src->slat_stat[i]);
 706                 convert_io_stat(&dst->lat_stat[i], &src->lat_stat[i]);
 707                 convert_io_stat(&dst->bw_stat[i], &src->bw_stat[i]);
 708         }
 709
 710         dst->usr_time           = le64_to_cpu(src->usr_time);
 711         dst->sys_time           = le64_to_cpu(src->sys_time);
 712         dst->ctx                = le64_to_cpu(src->ctx);
 713         dst->minf               = le64_to_cpu(src->minf);
 714         dst->majf               = le64_to_cpu(src->majf);
 715         dst->clat_percentiles   = le64_to_cpu(src->clat_percentiles);
 716
 717         for (i = 0; i < FIO_IO_U_LIST_MAX_LEN; i++) {
 718                 fio_fp64_t *fps = &src->percentile_list[i];
 719                 fio_fp64_t *fpd = &dst->percentile_list[i];
 720
 721                 fpd->u.f = fio_uint64_to_double(le64_to_cpu(fps->u.i));
 722         }
 723
 724         for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
 725                 dst->io_u_map[i]        = le32_to_cpu(src->io_u_map[i]);
 726                 dst->io_u_submit[i]     = le32_to_cpu(src->io_u_submit[i]);
 727                 dst->io_u_complete[i]   = le32_to_cpu(src->io_u_complete[i]);
 728         }
 729
 730         for (i = 0; i < FIO_IO_U_LAT_U_NR; i++) {
 731                 dst->io_u_lat_u[i]      = le32_to_cpu(src->io_u_lat_u[i]);
 732                 dst->io_u_lat_m[i]      = le32_to_cpu(src->io_u_lat_m[i]);
 733         }
 734
 735         for (i = 0; i < DDIR_RWDIR_CNT; i++)
 736                 for (j = 0; j < FIO_IO_U_PLAT_NR; j++)
 737                         dst->io_u_plat[i][j] = le32_to_cpu(src->io_u_plat[i][j]);
 738
 739         for (i = 0; i < 3; i++) {
 740                 dst->total_io_u[i]      = le64_to_cpu(src->total_io_u[i]);
 741                 dst->short_io_u[i]      = le64_to_cpu(src->short_io_u[i]);
 742         }
 743
 744         dst->total_submit       = le64_to_cpu(src->total_submit);
 745         dst->total_complete     = le64_to_cpu(src->total_complete);
 746
 747         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 748                 dst->io_bytes[i]        = le64_to_cpu(src->io_bytes[i]);
 749                 dst->runtime[i]         = le64_to_cpu(src->runtime[i]);
 750         }
 751
 752         dst->total_run_time     = le64_to_cpu(src->total_run_time);
 753         dst->continue_on_error  = le16_to_cpu(src->continue_on_error);
 754         dst->total_err_count    = le64_to_cpu(src->total_err_count);
 755         dst->first_error        = le32_to_cpu(src->first_error);
 756         dst->kb_base            = le32_to_cpu(src->kb_base);
 757 }
 758
 759 static void convert_gs(struct group_run_stats *dst, struct group_run_stats *src)
 760 {
 761         int i;
 762
 763         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 764                 dst->max_run[i]         = le64_to_cpu(src->max_run[i]);
 765                 dst->min_run[i]         = le64_to_cpu(src->min_run[i]);
 766                 dst->max_bw[i]          = le64_to_cpu(src->max_bw[i]);
 767                 dst->min_bw[i]          = le64_to_cpu(src->min_bw[i]);
 768                 dst->io_kb[i]           = le64_to_cpu(src->io_kb[i]);
 769                 dst->agg[i]             = le64_to_cpu(src->agg[i]);
 770         }
 771
 772         dst->kb_base    = le32_to_cpu(src->kb_base);
 773         dst->groupid    = le32_to_cpu(src->groupid);
 774 }
 775
 776 static void handle_ts(struct fio_client *client, struct fio_net_cmd *cmd)
 777 {
 778         struct cmd_ts_pdu *p = (struct cmd_ts_pdu *) cmd->payload;
 779
 780         show_thread_status(&p->ts, &p->rs);
 781         client->did_stat = 1;
 782
 783         if (!do_output_all_clients)
 784                 return;
 785
 786         sum_thread_stats(&client_ts, &p->ts, sum_stat_nr);
 787         sum_group_stats(&client_gs, &p->rs);
 788
 789         client_ts.members++;
 790         client_ts.thread_number = p->ts.thread_number;
 791         client_ts.groupid = p->ts.groupid;
 792
 793         if (++sum_stat_nr == sum_stat_clients) {
 794                 strcpy(client_ts.name, "All clients");
 795                 show_thread_status(&client_ts, &client_gs);
 796         }
 797 }
 798
 799 static void handle_gs(struct fio_client *client, struct fio_net_cmd *cmd)
 800 {
 801         struct group_run_stats *gs = (struct group_run_stats *) cmd->payload;
 802
 803         show_group_stats(gs);
 804 }
 805
 806 static void handle_text(struct fio_client *client, struct fio_net_cmd *cmd)
 807 {
 808         struct cmd_text_pdu *pdu = (struct cmd_text_pdu *) cmd->payload;
 809         const char *buf = (const char *) pdu->buf;
 810         const char *name;
 811         int fio_unused ret;
 812
 813         name = client->name ? client->name : client->hostname;
 814
 815         if (!client->skip_newline)
 816                 fprintf(f_out, "<%s> ", name);
 817         ret = fwrite(buf, pdu->buf_len, 1, f_out);
 818         fflush(f_out);
 819         client->skip_newline = strchr(buf, '\n') == NULL;
 820 }
 821
 822 static void convert_agg(struct disk_util_agg *agg)
 823 {
 824         int i;
 825
 826         for (i = 0; i < 2; i++) {
 827                 agg->ios[i]     = le32_to_cpu(agg->ios[i]);
 828                 agg->merges[i]  = le32_to_cpu(agg->merges[i]);
 829                 agg->sectors[i] = le64_to_cpu(agg->sectors[i]);
 830                 agg->ticks[i]   = le32_to_cpu(agg->ticks[i]);
 831         }
 832
 833         agg->io_ticks           = le32_to_cpu(agg->io_ticks);
 834         agg->time_in_queue      = le32_to_cpu(agg->time_in_queue);
 835         agg->slavecount         = le32_to_cpu(agg->slavecount);
 836         agg->max_util.u.f       = fio_uint64_to_double(__le64_to_cpu(agg->max_util.u.i));
 837 }
 838
 839 static void convert_dus(struct disk_util_stat *dus)
 840 {
 841         int i;
 842
 843         for (i = 0; i < 2; i++) {
 844                 dus->ios[i]     = le32_to_cpu(dus->ios[i]);
 845                 dus->merges[i]  = le32_to_cpu(dus->merges[i]);
 846                 dus->sectors[i] = le64_to_cpu(dus->sectors[i]);
 847                 dus->ticks[i]   = le32_to_cpu(dus->ticks[i]);
 848         }
 849
 850         dus->io_ticks           = le32_to_cpu(dus->io_ticks);
 851         dus->time_in_queue      = le32_to_cpu(dus->time_in_queue);
 852         dus->msec               = le64_to_cpu(dus->msec);
 853 }
 854
 855 static void handle_du(struct fio_client *client, struct fio_net_cmd *cmd)
 856 {
 857         struct cmd_du_pdu *du = (struct cmd_du_pdu *) cmd->payload;
 858
 859         if (!client->disk_stats_shown) {
 860                 client->disk_stats_shown = 1;
 861                 log_info("\nDisk stats (read/write):\n");
 862         }
 863
 864         print_disk_util(&du->dus, &du->agg, output_format == FIO_OUTPUT_TERSE);
 865 }
 866
 867 static void convert_jobs_eta(struct jobs_eta *je)
 868 {
 869         int i;
 870
 871         je->nr_running          = le32_to_cpu(je->nr_running);
 872         je->nr_ramp             = le32_to_cpu(je->nr_ramp);
 873         je->nr_pending          = le32_to_cpu(je->nr_pending);
 874         je->files_open          = le32_to_cpu(je->files_open);
 875
 876         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 877                 je->m_rate[i]   = le32_to_cpu(je->m_rate[i]);
 878                 je->t_rate[i]   = le32_to_cpu(je->t_rate[i]);
 879                 je->m_iops[i]   = le32_to_cpu(je->m_iops[i]);
 880                 je->t_iops[i]   = le32_to_cpu(je->t_iops[i]);
 881                 je->rate[i]     = le32_to_cpu(je->rate[i]);
 882                 je->iops[i]     = le32_to_cpu(je->iops[i]);
 883         }
 884
 885         je->elapsed_sec         = le64_to_cpu(je->elapsed_sec);
 886         je->eta_sec             = le64_to_cpu(je->eta_sec);
 887         je->nr_threads          = le32_to_cpu(je->nr_threads);
 888         je->is_pow2             = le32_to_cpu(je->is_pow2);
 889 }
 890
 891 void fio_client_sum_jobs_eta(struct jobs_eta *dst, struct jobs_eta *je)
 892 {
 893         int i;
 894
 895         dst->nr_running         += je->nr_running;
 896         dst->nr_ramp            += je->nr_ramp;
 897         dst->nr_pending         += je->nr_pending;
 898         dst->files_open         += je->files_open;
 899
 900         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 901                 dst->m_rate[i]  += je->m_rate[i];
 902                 dst->t_rate[i]  += je->t_rate[i];
 903                 dst->m_iops[i]  += je->m_iops[i];
 904                 dst->t_iops[i]  += je->t_iops[i];
 905                 dst->rate[i]    += je->rate[i];
 906                 dst->iops[i]    += je->iops[i];
 907         }
 908
 909         dst->elapsed_sec        += je->elapsed_sec;
 910
 911         if (je->eta_sec > dst->eta_sec)
 912                 dst->eta_sec = je->eta_sec;
 913
 914         dst->nr_threads         += je->nr_threads;
 915         /* we need to handle je->run_str too ... */
 916 }
 917
 918 void fio_client_dec_jobs_eta(struct client_eta *eta, client_eta_op eta_fn)
 919 {
 920         if (!--eta->pending) {
 921                 eta_fn(&eta->eta);
 922                 free(eta);
 923         }
 924 }
 925
 926 static void remove_reply_cmd(struct fio_client *client, struct fio_net_cmd *cmd)
 927 {
 928         struct fio_net_cmd_reply *reply = NULL;
 929         struct flist_head *entry;
 930
 931         flist_for_each(entry, &client->cmd_list) {
 932                 reply = flist_entry(entry, struct fio_net_cmd_reply, list);
 933
 934                 if (cmd->tag == (uintptr_t) reply)
 935                         break;
 936
 937                 reply = NULL;
 938         }
 939
 940         if (!reply) {
 941                 log_err("fio: client: unable to find matching tag (%lx)\n", cmd->tag);
 942                 return;
 943         }
 944
 945         flist_del(&reply->list);
 946         cmd->tag = reply->saved_tag;
 947         free(reply);
 948 }
 949
 950 int fio_client_wait_for_reply(struct fio_client *client, uint64_t tag)
 951 {
 952         do {
 953                 struct fio_net_cmd_reply *reply = NULL;
 954                 struct flist_head *entry;
 955
 956                 flist_for_each(entry, &client->cmd_list) {
 957                         reply = flist_entry(entry, struct fio_net_cmd_reply, list);
 958
 959                         if (tag == (uintptr_t) reply)
 960                                 break;
 961
 962                         reply = NULL;
 963                 }
 964
 965                 if (!reply)
 966                         break;
 967
 968                 usleep(1000);
 969         } while (1);
 970
 971         return 0;
 972 }
 973
 974 static void handle_eta(struct fio_client *client, struct fio_net_cmd *cmd)
 975 {
 976         struct jobs_eta *je = (struct jobs_eta *) cmd->payload;
 977         struct client_eta *eta = (struct client_eta *) (uintptr_t) cmd->tag;
 978
 979         dprint(FD_NET, "client: got eta tag %p, %d\n", eta, eta->pending);
 980
 981         assert(client->eta_in_flight == eta);
 982
 983         client->eta_in_flight = NULL;
 984         flist_del_init(&client->eta_list);
 985
 986         if (client->ops->jobs_eta)
 987                 client->ops->jobs_eta(client, je);
 988
 989         fio_client_sum_jobs_eta(&eta->eta, je);
 990         fio_client_dec_jobs_eta(eta, client->ops->eta);
 991 }
 992
 993 static void handle_probe(struct fio_client *client, struct fio_net_cmd *cmd)
 994 {
 995         struct cmd_probe_pdu *probe = (struct cmd_probe_pdu *) cmd->payload;
 996         const char *os, *arch;
 997         char bit[16];
 998
 999         os = fio_get_os_string(probe->os);
1000         if (!os)
1001                 os = "unknown";
1002
1003         arch = fio_get_arch_string(probe->arch);
1004         if (!arch)
1005                 os = "unknown";
1006
1007         sprintf(bit, "%d-bit", probe->bpp * 8);
1008
1009         log_info("hostname=%s, be=%u, %s, os=%s, arch=%s, fio=%s\n",
1010                 probe->hostname, probe->bigendian, bit, os, arch,
1011                 probe->fio_version);
1012
1013         if (!client->name)
1014                 client->name = strdup((char *) probe->hostname);
1015 }
1016
1017 static void handle_start(struct fio_client *client, struct fio_net_cmd *cmd)
1018 {
1019         struct cmd_start_pdu *pdu = (struct cmd_start_pdu *) cmd->payload;
1020
1021         client->state = Client_started;
1022         client->jobs = le32_to_cpu(pdu->jobs);
1023         client->nr_stat = le32_to_cpu(pdu->stat_outputs);
1024
1025         if (sum_stat_clients > 1)
1026                 do_output_all_clients = 1;
1027
1028         sum_stat_clients += client->nr_stat;
1029 }
1030
1031 static void handle_stop(struct fio_client *client, struct fio_net_cmd *cmd)
1032 {
1033         if (client->error)
1034                 log_info("client <%s>: exited with error %d\n", client->hostname, client->error);
1035 }
1036
1037 static void convert_stop(struct fio_net_cmd *cmd)
1038 {
1039         struct cmd_end_pdu *pdu = (struct cmd_end_pdu *) cmd->payload;
1040
1041         pdu->error = le32_to_cpu(pdu->error);
1042 }
1043
1044 static void convert_text(struct fio_net_cmd *cmd)
1045 {
1046         struct cmd_text_pdu *pdu = (struct cmd_text_pdu *) cmd->payload;
1047
1048         pdu->level      = le32_to_cpu(pdu->level);
1049         pdu->buf_len    = le32_to_cpu(pdu->buf_len);
1050         pdu->log_sec    = le64_to_cpu(pdu->log_sec);
1051         pdu->log_usec   = le64_to_cpu(pdu->log_usec);
1052 }
1053
1054 /*
1055  * This has been compressed on the server side, since it can be big.
1056  * Uncompress here.
1057  */
1058 static struct cmd_iolog_pdu *convert_iolog(struct fio_net_cmd *cmd)
1059 {
1060         struct cmd_iolog_pdu *pdu = (struct cmd_iolog_pdu *) cmd->payload;
1061         struct cmd_iolog_pdu *ret;
1062         uint32_t nr_samples;
1063         unsigned long total;
1064         z_stream stream;
1065         void *p;
1066         int i;
1067
1068         stream.zalloc = Z_NULL;
1069         stream.zfree = Z_NULL;
1070         stream.opaque = Z_NULL;
1071         stream.avail_in = 0;
1072         stream.next_in = Z_NULL;
1073
1074         if (inflateInit(&stream) != Z_OK)
1075                 return NULL;
1076
1077         /*
1078          * Get header first, it's not compressed
1079          */
1080         nr_samples = le32_to_cpu(pdu->nr_samples);
1081
1082         total = nr_samples * sizeof(struct io_sample);
1083         ret = malloc(total + sizeof(*pdu));
1084         ret->thread_number = le32_to_cpu(pdu->thread_number);
1085         ret->nr_samples = nr_samples;
1086         ret->log_type = le32_to_cpu(pdu->log_type);
1087         strcpy((char *) ret->name, (char *) pdu->name);
1088
1089         p = (void *) ret + sizeof(*pdu);
1090
1091         stream.avail_in = cmd->pdu_len - sizeof(*pdu);
1092         stream.next_in = (void *) pdu + sizeof(*pdu);
1093         while (stream.avail_in) {
1094                 unsigned int this_chunk = 65536;
1095                 unsigned int this_len;
1096                 int err;
1097
1098                 if (this_chunk > total)
1099                         this_chunk = total;
1100
1101                 stream.avail_out = this_chunk;
1102                 stream.next_out = p;
1103                 err = inflate(&stream, Z_NO_FLUSH);
1104                 /* may be Z_OK, or Z_STREAM_END */
1105                 if (err < 0) {
1106                         log_err("fio: inflate error %d\n", err);
1107                         free(ret);
1108                         ret = NULL;
1109                         goto out;
1110                 }
1111
1112                 this_len = this_chunk - stream.avail_out;
1113                 p += this_len;
1114                 total -= this_len;
1115         }
1116
1117         for (i = 0; i < ret->nr_samples; i++) {
1118                 struct io_sample *s = &ret->samples[i];
1119
1120                 s->time = le64_to_cpu(s->time);
1121                 s->val  = le64_to_cpu(s->val);
1122                 s->ddir = le32_to_cpu(s->ddir);
1123                 s->bs   = le32_to_cpu(s->bs);
1124         }
1125
1126 out:
1127         inflateEnd(&stream);
1128         return ret;
1129 }
1130
1131 int fio_handle_client(struct fio_client *client)
1132 {
1133         struct client_ops *ops = client->ops;
1134         struct fio_net_cmd *cmd;
1135
1136         dprint(FD_NET, "client: handle %s\n", client->hostname);
1137
1138         cmd = fio_net_recv_cmd(client->fd);
1139         if (!cmd)
1140                 return 0;
1141
1142         dprint(FD_NET, "client: got cmd op %s from %s (pdu=%u)\n",
1143                 fio_server_op(cmd->opcode), client->hostname, cmd->pdu_len);
1144
1145         switch (cmd->opcode) {
1146         case FIO_NET_CMD_QUIT:
1147                 if (ops->quit)
1148                         ops->quit(client, cmd);
1149                 remove_client(client);
1150                 free(cmd);
1151                 break;
1152         case FIO_NET_CMD_TEXT:
1153                 convert_text(cmd);
1154                 ops->text(client, cmd);
1155                 free(cmd);
1156                 break;
1157         case FIO_NET_CMD_DU: {
1158                 struct cmd_du_pdu *du = (struct cmd_du_pdu *) cmd->payload;
1159
1160                 convert_dus(&du->dus);
1161                 convert_agg(&du->agg);
1162
1163                 ops->disk_util(client, cmd);
1164                 free(cmd);
1165                 break;
1166                 }
1167         case FIO_NET_CMD_TS: {
1168                 struct cmd_ts_pdu *p = (struct cmd_ts_pdu *) cmd->payload;
1169
1170                 convert_ts(&p->ts, &p->ts);
1171                 convert_gs(&p->rs, &p->rs);
1172
1173                 ops->thread_status(client, cmd);
1174                 free(cmd);
1175                 break;
1176                 }
1177         case FIO_NET_CMD_GS: {
1178                 struct group_run_stats *gs = (struct group_run_stats *) cmd->payload;
1179
1180                 convert_gs(gs, gs);
1181
1182                 ops->group_stats(client, cmd);
1183                 free(cmd);
1184                 break;
1185                 }
1186         case FIO_NET_CMD_ETA: {
1187                 struct jobs_eta *je = (struct jobs_eta *) cmd->payload;
1188
1189                 remove_reply_cmd(client, cmd);
1190                 convert_jobs_eta(je);
1191                 handle_eta(client, cmd);
1192                 free(cmd);
1193                 break;
1194                 }
1195         case FIO_NET_CMD_PROBE:
1196                 remove_reply_cmd(client, cmd);
1197                 ops->probe(client, cmd);
1198                 free(cmd);
1199                 break;
1200         case FIO_NET_CMD_SERVER_START:
1201                 client->state = Client_running;
1202                 if (ops->job_start)
1203                         ops->job_start(client, cmd);
1204                 free(cmd);
1205                 break;
1206         case FIO_NET_CMD_START: {
1207                 struct cmd_start_pdu *pdu = (struct cmd_start_pdu *) cmd->payload;
1208
1209                 pdu->jobs = le32_to_cpu(pdu->jobs);
1210                 ops->start(client, cmd);
1211                 free(cmd);
1212                 break;
1213                 }
1214         case FIO_NET_CMD_STOP: {
1215                 struct cmd_end_pdu *pdu = (struct cmd_end_pdu *) cmd->payload;
1216
1217                 convert_stop(cmd);
1218                 client->state = Client_stopped;
1219                 client->error = le32_to_cpu(pdu->error);
1220                 client->signal = le32_to_cpu(pdu->signal);
1221                 ops->stop(client, cmd);
1222                 free(cmd);
1223                 break;
1224                 }
1225         case FIO_NET_CMD_ADD_JOB: {
1226                 struct cmd_add_job_pdu *pdu = (struct cmd_add_job_pdu *) cmd->payload;
1227
1228                 client->thread_number = le32_to_cpu(pdu->thread_number);
1229                 client->groupid = le32_to_cpu(pdu->groupid);
1230
1231                 if (ops->add_job)
1232                         ops->add_job(client, cmd);
1233                 free(cmd);
1234                 break;
1235                 }
1236         case FIO_NET_CMD_IOLOG:
1237                 if (ops->iolog) {
1238                         struct cmd_iolog_pdu *pdu;
1239
1240                         pdu = convert_iolog(cmd);
1241                         ops->iolog(client, pdu);
1242                 }
1243                 free(cmd);
1244                 break;
1245         case FIO_NET_CMD_UPDATE_JOB:
1246                 ops->update_job(client, cmd);
1247                 remove_reply_cmd(client, cmd);
1248                 free(cmd);
1249                 break;
1250         default:
1251                 log_err("fio: unknown client op: %s\n", fio_server_op(cmd->opcode));
1252                 free(cmd);
1253                 break;
1254         }
1255
1256         return 1;
1257 }
1258
1259 static void request_client_etas(struct client_ops *ops)
1260 {
1261         struct fio_client *client;
1262         struct flist_head *entry;
1263         struct client_eta *eta;
1264         int skipped = 0;
1265
1266         dprint(FD_NET, "client: request eta (%d)\n", nr_clients);
1267
1268         eta = malloc(sizeof(*eta));
1269         memset(&eta->eta, 0, sizeof(eta->eta));
1270         eta->pending = nr_clients;
1271
1272         flist_for_each(entry, &client_list) {
1273                 client = flist_entry(entry, struct fio_client, list);
1274
1275                 if (!flist_empty(&client->eta_list)) {
1276                         skipped++;
1277                         continue;
1278                 }
1279                 if (client->state != Client_running)
1280                         continue;
1281
1282                 assert(!client->eta_in_flight);
1283                 flist_add_tail(&client->eta_list, &eta_list);
1284                 client->eta_in_flight = eta;
1285                 fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_SEND_ETA,
1286                                         (uintptr_t) eta, &client->cmd_list);
1287         }
1288
1289         while (skipped--)
1290                 fio_client_dec_jobs_eta(eta, ops->eta);
1291
1292         dprint(FD_NET, "client: requested eta tag %p\n", eta);
1293 }
1294
1295 static int client_check_cmd_timeout(struct fio_client *client,
1296                                     struct timeval *now)
1297 {
1298         struct fio_net_cmd_reply *reply;
1299         struct flist_head *entry, *tmp;
1300         int ret = 0;
1301
1302         flist_for_each_safe(entry, tmp, &client->cmd_list) {
1303                 reply = flist_entry(entry, struct fio_net_cmd_reply, list);
1304
1305                 if (mtime_since(&reply->tv, now) < FIO_NET_CLIENT_TIMEOUT)
1306                         continue;
1307
1308                 log_err("fio: client %s, timeout on cmd %s\n", client->hostname,
1309                                                 fio_server_op(reply->opcode));
1310                 flist_del(&reply->list);
1311                 free(reply);
1312                 ret = 1;
1313         }
1314
1315         return flist_empty(&client->cmd_list) && ret;
1316 }
1317
1318 static int fio_check_clients_timed_out(void)
1319 {
1320         struct fio_client *client;
1321         struct flist_head *entry, *tmp;
1322         struct timeval tv;
1323         int ret = 0;
1324
1325         gettimeofday(&tv, NULL);
1326
1327         flist_for_each_safe(entry, tmp, &client_list) {
1328                 client = flist_entry(entry, struct fio_client, list);
1329
1330                 if (flist_empty(&client->cmd_list))
1331                         continue;
1332
1333                 if (!client_check_cmd_timeout(client, &tv))
1334                         continue;
1335
1336                 if (client->ops->timed_out)
1337                         client->ops->timed_out(client);
1338                 else
1339                         log_err("fio: client %s timed out\n", client->hostname);
1340
1341                 remove_client(client);
1342                 ret = 1;
1343         }
1344
1345         return ret;
1346 }
1347
1348 int fio_handle_clients(struct client_ops *ops)
1349 {
1350         struct pollfd *pfds;
1351         int i, ret = 0, retval = 0;
1352
1353         gettimeofday(&eta_tv, NULL);
1354
1355         pfds = malloc(nr_clients * sizeof(struct pollfd));
1356
1357         init_thread_stat(&client_ts);
1358         init_group_run_stat(&client_gs);
1359
1360         while (!exit_backend && nr_clients) {
1361                 struct flist_head *entry, *tmp;
1362                 struct fio_client *client;
1363
1364                 i = 0;
1365                 flist_for_each_safe(entry, tmp, &client_list) {
1366                         client = flist_entry(entry, struct fio_client, list);
1367
1368                         if (!client->sent_job && !client->ops->stay_connected &&
1369                             flist_empty(&client->cmd_list)) {
1370                                 remove_client(client);
1371                                 continue;
1372                         }
1373
1374                         pfds[i].fd = client->fd;
1375                         pfds[i].events = POLLIN;
1376                         i++;
1377                 }
1378
1379                 if (!nr_clients)
1380                         break;
1381
1382                 assert(i == nr_clients);
1383
1384                 do {
1385                         struct timeval tv;
1386
1387                         gettimeofday(&tv, NULL);
1388                         if (mtime_since(&eta_tv, &tv) >= ops->eta_msec) {
1389                                 request_client_etas(ops);
1390                                 memcpy(&eta_tv, &tv, sizeof(tv));
1391
1392                                 if (fio_check_clients_timed_out())
1393                                         break;
1394                         }
1395
1396                         ret = poll(pfds, nr_clients, ops->eta_msec);
1397                         if (ret < 0) {
1398                                 if (errno == EINTR)
1399                                         continue;
1400                                 log_err("fio: poll clients: %s\n", strerror(errno));
1401                                 break;
1402                         } else if (!ret)
1403                                 continue;
1404                 } while (ret <= 0);
1405
1406                 for (i = 0; i < nr_clients; i++) {
1407                         if (!(pfds[i].revents & POLLIN))
1408                                 continue;
1409
1410                         client = find_client_by_fd(pfds[i].fd);
1411                         if (!client) {
1412                                 log_err("fio: unknown client fd %d\n", pfds[i].fd);
1413                                 continue;
1414                         }
1415                         if (!fio_handle_client(client)) {
1416                                 log_info("client: host=%s disconnected\n",
1417                                                 client->hostname);
1418                                 remove_client(client);
1419                                 retval = 1;
1420                         } else if (client->error)
1421                                 retval = 1;
1422                         fio_put_client(client);
1423                 }
1424         }
1425
1426         free(pfds);
1427         return retval;
1428 }