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
  18 #include "fio.h"
  19 #include "server.h"
  20 #include "flist.h"
  21 #include "hash.h"
  22
  23 struct client_eta {
  24         struct jobs_eta eta;
  25         unsigned int pending;
  26 };
  27
  28 struct fio_client {
  29         struct flist_head list;
  30         struct flist_head hash_list;
  31         struct flist_head arg_list;
  32         struct sockaddr_in addr;
  33         struct sockaddr_un addr_un;
  34         char *hostname;
  35         int port;
  36         int fd;
  37
  38         char *name;
  39
  40         int state;
  41
  42         int skip_newline;
  43         int is_sock;
  44
  45         struct flist_head eta_list;
  46         struct client_eta *eta_in_flight;
  47
  48         uint16_t argc;
  49         char **argv;
  50 };
  51
  52 static struct timeval eta_tv;
  53
  54 enum {
  55         Client_created          = 0,
  56         Client_connected        = 1,
  57         Client_started          = 2,
  58         Client_stopped          = 3,
  59         Client_exited           = 4,
  60 };
  61
  62 static FLIST_HEAD(client_list);
  63 static FLIST_HEAD(eta_list);
  64
  65 static FLIST_HEAD(arg_list);
  66
  67 #define FIO_CLIENT_HASH_BITS    7
  68 #define FIO_CLIENT_HASH_SZ      (1 << FIO_CLIENT_HASH_BITS)
  69 #define FIO_CLIENT_HASH_MASK    (FIO_CLIENT_HASH_SZ - 1)
  70 static struct flist_head client_hash[FIO_CLIENT_HASH_SZ];
  71
  72 static int handle_client(struct fio_client *client);
  73 static void dec_jobs_eta(struct client_eta *eta);
  74
  75 static void fio_client_add_hash(struct fio_client *client)
  76 {
  77         int bucket = hash_long(client->fd, FIO_CLIENT_HASH_BITS);
  78
  79         bucket &= FIO_CLIENT_HASH_MASK;
  80         flist_add(&client->hash_list, &client_hash[bucket]);
  81 }
  82
  83 static void fio_client_remove_hash(struct fio_client *client)
  84 {
  85         if (!flist_empty(&client->hash_list))
  86                 flist_del_init(&client->hash_list);
  87 }
  88
  89 static void fio_init fio_client_hash_init(void)
  90 {
  91         int i;
  92
  93         for (i = 0; i < FIO_CLIENT_HASH_SZ; i++)
  94                 INIT_FLIST_HEAD(&client_hash[i]);
  95 }
  96
  97 static struct fio_client *find_client_by_fd(int fd)
  98 {
  99         int bucket = hash_long(fd, FIO_CLIENT_HASH_BITS) & FIO_CLIENT_HASH_MASK;
 100         struct fio_client *client;
 101         struct flist_head *entry;
 102
 103         flist_for_each(entry, &client_hash[bucket]) {
 104                 client = flist_entry(entry, struct fio_client, hash_list);
 105
 106                 if (client->fd == fd)
 107                         return client;
 108         }
 109
 110         return NULL;
 111 }
 112
 113 static void remove_client(struct fio_client *client)
 114 {
 115         dprint(FD_NET, "client: removed <%s>\n", client->hostname);
 116         flist_del(&client->list);
 117
 118         fio_client_remove_hash(client);
 119
 120         if (!flist_empty(&client->eta_list)) {
 121                 flist_del_init(&client->eta_list);
 122                 dec_jobs_eta(client->eta_in_flight);
 123         }
 124
 125         free(client->hostname);
 126         if (client->argv)
 127                 free(client->argv);
 128         if (client->name)
 129                 free(client->name);
 130
 131         free(client);
 132         nr_clients--;
 133 }
 134
 135 static void __fio_client_add_cmd_option(struct fio_client *client,
 136                                         const char *opt)
 137 {
 138         int index;
 139
 140         index = client->argc++;
 141         client->argv = realloc(client->argv, sizeof(char *) * client->argc);
 142         client->argv[index] = strdup(opt);
 143         dprint(FD_NET, "client: add cmd %d: %s\n", index, opt);
 144 }
 145
 146 void fio_client_add_cmd_option(void *cookie, const char *opt)
 147 {
 148         struct fio_client *client = cookie;
 149         struct flist_head *entry;
 150
 151         if (!client || !opt)
 152                 return;
 153
 154         __fio_client_add_cmd_option(client, opt);
 155
 156         /*
 157          * Duplicate arguments to shared client group
 158          */
 159         flist_for_each(entry, &arg_list) {
 160                 client = flist_entry(entry, struct fio_client, arg_list);
 161
 162                 __fio_client_add_cmd_option(client, opt);
 163         }
 164 }
 165
 166 int fio_client_add(const char *hostname, void **cookie)
 167 {
 168         struct fio_client *existing = *cookie;
 169         struct fio_client *client;
 170
 171         if (existing) {
 172                 /*
 173                  * We always add our "exec" name as the option, hence 1
 174                  * means empty.
 175                  */
 176                 if (existing->argc == 1)
 177                         flist_add_tail(&existing->arg_list, &arg_list);
 178                 else {
 179                         while (!flist_empty(&arg_list))
 180                                 flist_del_init(arg_list.next);
 181                 }
 182         }
 183
 184         client = malloc(sizeof(*client));
 185         memset(client, 0, sizeof(*client));
 186
 187         INIT_FLIST_HEAD(&client->list);
 188         INIT_FLIST_HEAD(&client->hash_list);
 189         INIT_FLIST_HEAD(&client->arg_list);
 190         INIT_FLIST_HEAD(&client->eta_list);
 191
 192         if (fio_server_parse_string(hostname, &client->hostname,
 193                                         &client->is_sock, &client->port,
 194                                         &client->addr.sin_addr))
 195                 return -1;
 196
 197         client->fd = -1;
 198
 199         __fio_client_add_cmd_option(client, "fio");
 200
 201         flist_add(&client->list, &client_list);
 202         nr_clients++;
 203         dprint(FD_NET, "client: added <%s>\n", client->hostname);
 204         *cookie = client;
 205         return 0;
 206 }
 207
 208 static int fio_client_connect_ip(struct fio_client *client)
 209 {
 210         int fd;
 211
 212         client->addr.sin_family = AF_INET;
 213         client->addr.sin_port = htons(client->port);
 214
 215         fd = socket(AF_INET, SOCK_STREAM, 0);
 216         if (fd < 0) {
 217                 log_err("fio: socket: %s\n", strerror(errno));
 218                 return -1;
 219         }
 220
 221         if (connect(fd, (struct sockaddr *) &client->addr, sizeof(client->addr)) < 0) {
 222                 log_err("fio: connect: %s\n", strerror(errno));
 223                 log_err("fio: failed to connect to %s:%u\n", client->hostname,
 224                                                                 client->port);
 225                 close(fd);
 226                 return -1;
 227         }
 228
 229         return fd;
 230 }
 231
 232 static int fio_client_connect_sock(struct fio_client *client)
 233 {
 234         struct sockaddr_un *addr = &client->addr_un;
 235         fio_socklen_t len;
 236         int fd;
 237
 238         memset(addr, 0, sizeof(*addr));
 239         addr->sun_family = AF_UNIX;
 240         strcpy(addr->sun_path, client->hostname);
 241
 242         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 243         if (fd < 0) {
 244                 log_err("fio: socket: %s\n", strerror(errno));
 245                 return -1;
 246         }
 247
 248         len = sizeof(addr->sun_family) + strlen(addr->sun_path) + 1;
 249         if (connect(fd, (struct sockaddr *) addr, len) < 0) {
 250                 log_err("fio: connect; %s\n", strerror(errno));
 251                 close(fd);
 252                 return -1;
 253         }
 254
 255         return fd;
 256 }
 257
 258 static int fio_client_connect(struct fio_client *client)
 259 {
 260         int fd;
 261
 262         dprint(FD_NET, "client: connect to host %s\n", client->hostname);
 263
 264         if (client->is_sock)
 265                 fd = fio_client_connect_sock(client);
 266         else
 267                 fd = fio_client_connect_ip(client);
 268
 269         if (fd < 0)
 270                 return 1;
 271
 272         client->fd = fd;
 273         fio_client_add_hash(client);
 274         client->state = Client_connected;
 275         return 0;
 276 }
 277
 278 void fio_clients_terminate(void)
 279 {
 280         struct flist_head *entry;
 281         struct fio_client *client;
 282
 283         dprint(FD_NET, "client: terminate clients\n");
 284
 285         flist_for_each(entry, &client_list) {
 286                 client = flist_entry(entry, struct fio_client, list);
 287
 288                 fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_QUIT, 0);
 289         }
 290 }
 291
 292 static void sig_int(int sig)
 293 {
 294         dprint(FD_NET, "client: got signal %d\n", sig);
 295         fio_clients_terminate();
 296 }
 297
 298 static void client_signal_handler(void)
 299 {
 300         struct sigaction act;
 301
 302         memset(&act, 0, sizeof(act));
 303         act.sa_handler = sig_int;
 304         act.sa_flags = SA_RESTART;
 305         sigaction(SIGINT, &act, NULL);
 306
 307         memset(&act, 0, sizeof(act));
 308         act.sa_handler = sig_int;
 309         act.sa_flags = SA_RESTART;
 310         sigaction(SIGTERM, &act, NULL);
 311 }
 312
 313 static void probe_client(struct fio_client *client)
 314 {
 315         dprint(FD_NET, "client: send probe\n");
 316
 317         fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_PROBE, 0);
 318         handle_client(client);
 319 }
 320
 321 static int send_client_cmd_line(struct fio_client *client)
 322 {
 323         struct cmd_single_line_pdu *cslp;
 324         struct cmd_line_pdu *clp;
 325         unsigned long offset;
 326         unsigned int *lens;
 327         void *pdu;
 328         size_t mem;
 329         int i, ret;
 330
 331         dprint(FD_NET, "client: send cmdline %d\n", client->argc);
 332
 333         lens = malloc(client->argc * sizeof(unsigned int));
 334
 335         /*
 336          * Find out how much mem we need
 337          */
 338         for (i = 0, mem = 0; i < client->argc; i++) {
 339                 lens[i] = strlen(client->argv[i]) + 1;
 340                 mem += lens[i];
 341         }
 342
 343         /*
 344          * We need one cmd_line_pdu, and argc number of cmd_single_line_pdu
 345          */
 346         mem += sizeof(*clp) + (client->argc * sizeof(*cslp));
 347
 348         pdu = malloc(mem);
 349         clp = pdu;
 350         offset = sizeof(*clp);
 351
 352         for (i = 0; i < client->argc; i++) {
 353                 uint16_t arg_len = lens[i];
 354
 355                 cslp = pdu + offset;
 356                 strcpy((char *) cslp->text, client->argv[i]);
 357                 cslp->len = cpu_to_le16(arg_len);
 358                 offset += sizeof(*cslp) + arg_len;
 359         }
 360
 361         free(lens);
 362         clp->lines = cpu_to_le16(client->argc);
 363         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOBLINE, pdu, mem, 0);
 364         free(pdu);
 365         return ret;
 366 }
 367
 368 int fio_clients_connect(void)
 369 {
 370         struct fio_client *client;
 371         struct flist_head *entry, *tmp;
 372         int ret;
 373
 374         dprint(FD_NET, "client: connect all\n");
 375
 376         client_signal_handler();
 377
 378         flist_for_each_safe(entry, tmp, &client_list) {
 379                 client = flist_entry(entry, struct fio_client, list);
 380
 381                 ret = fio_client_connect(client);
 382                 if (ret) {
 383                         remove_client(client);
 384                         continue;
 385                 }
 386
 387                 probe_client(client);
 388
 389                 if (client->argc > 1)
 390                         send_client_cmd_line(client);
 391         }
 392
 393         return !nr_clients;
 394 }
 395
 396 /*
 397  * Send file contents to server backend. We could use sendfile(), but to remain
 398  * more portable lets just read/write the darn thing.
 399  */
 400 static int fio_client_send_ini(struct fio_client *client, const char *filename)
 401 {
 402         struct stat sb;
 403         char *p, *buf;
 404         off_t len;
 405         int fd, ret;
 406
 407         dprint(FD_NET, "send ini %s to %s\n", filename, client->hostname);
 408
 409         fd = open(filename, O_RDONLY);
 410         if (fd < 0) {
 411                 log_err("fio: job file <%s> open: %s\n", filename, strerror(errno));
 412                 return 1;
 413         }
 414
 415         if (fstat(fd, &sb) < 0) {
 416                 log_err("fio: job file stat: %s\n", strerror(errno));
 417                 close(fd);
 418                 return 1;
 419         }
 420
 421         buf = malloc(sb.st_size);
 422
 423         len = sb.st_size;
 424         p = buf;
 425         do {
 426                 ret = read(fd, p, len);
 427                 if (ret > 0) {
 428                         len -= ret;
 429                         if (!len)
 430                                 break;
 431                         p += ret;
 432                         continue;
 433                 } else if (!ret)
 434                         break;
 435                 else if (errno == EAGAIN || errno == EINTR)
 436                         continue;
 437         } while (1);
 438
 439         if (len) {
 440                 log_err("fio: failed reading job file %s\n", filename);
 441                 close(fd);
 442                 free(buf);
 443                 return 1;
 444         }
 445
 446         ret = fio_net_send_cmd(client->fd, FIO_NET_CMD_JOB, buf, sb.st_size, 0);
 447         free(buf);
 448         close(fd);
 449         return ret;
 450 }
 451
 452 int fio_clients_send_ini(const char *filename)
 453 {
 454         struct fio_client *client;
 455         struct flist_head *entry, *tmp;
 456
 457         flist_for_each_safe(entry, tmp, &client_list) {
 458                 client = flist_entry(entry, struct fio_client, list);
 459
 460                 if (fio_client_send_ini(client, filename))
 461                         remove_client(client);
 462         }
 463
 464         return !nr_clients;
 465 }
 466
 467 static void convert_io_stat(struct io_stat *dst, struct io_stat *src)
 468 {
 469         dst->max_val    = le64_to_cpu(src->max_val);
 470         dst->min_val    = le64_to_cpu(src->min_val);
 471         dst->samples    = le64_to_cpu(src->samples);
 472
 473         /*
 474          * Floats arrive as IEEE 754 encoded uint64_t, convert back to double
 475          */
 476         dst->mean.u.f   = fio_uint64_to_double(le64_to_cpu(dst->mean.u.i));
 477         dst->S.u.f      = fio_uint64_to_double(le64_to_cpu(dst->S.u.i));
 478 }
 479
 480 static void convert_ts(struct thread_stat *dst, struct thread_stat *src)
 481 {
 482         int i, j;
 483
 484         dst->error      = le32_to_cpu(src->error);
 485         dst->groupid    = le32_to_cpu(src->groupid);
 486         dst->pid        = le32_to_cpu(src->pid);
 487         dst->members    = le32_to_cpu(src->members);
 488
 489         for (i = 0; i < 2; i++) {
 490                 convert_io_stat(&dst->clat_stat[i], &src->clat_stat[i]);
 491                 convert_io_stat(&dst->slat_stat[i], &src->slat_stat[i]);
 492                 convert_io_stat(&dst->lat_stat[i], &src->lat_stat[i]);
 493                 convert_io_stat(&dst->bw_stat[i], &src->bw_stat[i]);
 494         }
 495
 496         dst->usr_time           = le64_to_cpu(src->usr_time);
 497         dst->sys_time           = le64_to_cpu(src->sys_time);
 498         dst->ctx                = le64_to_cpu(src->ctx);
 499         dst->minf               = le64_to_cpu(src->minf);
 500         dst->majf               = le64_to_cpu(src->majf);
 501         dst->clat_percentiles   = le64_to_cpu(src->clat_percentiles);
 502
 503         for (i = 0; i < FIO_IO_U_LIST_MAX_LEN; i++) {
 504                 fio_fp64_t *fps = &src->percentile_list[i];
 505                 fio_fp64_t *fpd = &dst->percentile_list[i];
 506
 507                 fpd->u.f = fio_uint64_to_double(le64_to_cpu(fps->u.i));
 508         }
 509
 510         for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
 511                 dst->io_u_map[i]        = le32_to_cpu(src->io_u_map[i]);
 512                 dst->io_u_submit[i]     = le32_to_cpu(src->io_u_submit[i]);
 513                 dst->io_u_complete[i]   = le32_to_cpu(src->io_u_complete[i]);
 514         }
 515
 516         for (i = 0; i < FIO_IO_U_LAT_U_NR; i++) {
 517                 dst->io_u_lat_u[i]      = le32_to_cpu(src->io_u_lat_u[i]);
 518                 dst->io_u_lat_m[i]      = le32_to_cpu(src->io_u_lat_m[i]);
 519         }
 520
 521         for (i = 0; i < 2; i++)
 522                 for (j = 0; j < FIO_IO_U_PLAT_NR; j++)
 523                         dst->io_u_plat[i][j] = le32_to_cpu(src->io_u_plat[i][j]);
 524
 525         for (i = 0; i < 3; i++) {
 526                 dst->total_io_u[i]      = le64_to_cpu(src->total_io_u[i]);
 527                 dst->short_io_u[i]      = le64_to_cpu(src->short_io_u[i]);
 528         }
 529
 530         dst->total_submit       = le64_to_cpu(src->total_submit);
 531         dst->total_complete     = le64_to_cpu(src->total_complete);
 532
 533         for (i = 0; i < 2; i++) {
 534                 dst->io_bytes[i]        = le64_to_cpu(src->io_bytes[i]);
 535                 dst->runtime[i]         = le64_to_cpu(src->runtime[i]);
 536         }
 537
 538         dst->total_run_time     = le64_to_cpu(src->total_run_time);
 539         dst->continue_on_error  = le16_to_cpu(src->continue_on_error);
 540         dst->total_err_count    = le64_to_cpu(src->total_err_count);
 541         dst->first_error        = le32_to_cpu(src->first_error);
 542         dst->kb_base            = le32_to_cpu(src->kb_base);
 543 }
 544
 545 static void convert_gs(struct group_run_stats *dst, struct group_run_stats *src)
 546 {
 547         int i;
 548
 549         for (i = 0; i < 2; i++) {
 550                 dst->max_run[i]         = le64_to_cpu(src->max_run[i]);
 551                 dst->min_run[i]         = le64_to_cpu(src->min_run[i]);
 552                 dst->max_bw[i]          = le64_to_cpu(src->max_bw[i]);
 553                 dst->min_bw[i]          = le64_to_cpu(src->min_bw[i]);
 554                 dst->io_kb[i]           = le64_to_cpu(src->io_kb[i]);
 555                 dst->agg[i]             = le64_to_cpu(src->agg[i]);
 556         }
 557
 558         dst->kb_base    = le32_to_cpu(src->kb_base);
 559         dst->groupid    = le32_to_cpu(src->groupid);
 560 }
 561
 562 static void handle_ts(struct fio_net_cmd *cmd)
 563 {
 564         struct cmd_ts_pdu *p = (struct cmd_ts_pdu *) cmd->payload;
 565
 566         convert_ts(&p->ts, &p->ts);
 567         convert_gs(&p->rs, &p->rs);
 568
 569         show_thread_status(&p->ts, &p->rs);
 570 }
 571
 572 static void handle_gs(struct fio_net_cmd *cmd)
 573 {
 574         struct group_run_stats *gs = (struct group_run_stats *) cmd->payload;
 575
 576         convert_gs(gs, gs);
 577         show_group_stats(gs);
 578 }
 579
 580 static void convert_jobs_eta(struct jobs_eta *je)
 581 {
 582         int i;
 583
 584         je->nr_running          = le32_to_cpu(je->nr_running);
 585         je->nr_ramp             = le32_to_cpu(je->nr_ramp);
 586         je->nr_pending          = le32_to_cpu(je->nr_pending);
 587         je->files_open          = le32_to_cpu(je->files_open);
 588         je->m_rate              = le32_to_cpu(je->m_rate);
 589         je->t_rate              = le32_to_cpu(je->t_rate);
 590         je->m_iops              = le32_to_cpu(je->m_iops);
 591         je->t_iops              = le32_to_cpu(je->t_iops);
 592
 593         for (i = 0; i < 2; i++) {
 594                 je->rate[i]     = le32_to_cpu(je->rate[i]);
 595                 je->iops[i]     = le32_to_cpu(je->iops[i]);
 596         }
 597
 598         je->elapsed_sec         = le64_to_cpu(je->elapsed_sec);
 599         je->eta_sec             = le64_to_cpu(je->eta_sec);
 600 }
 601
 602 static void sum_jobs_eta(struct jobs_eta *dst, struct jobs_eta *je)
 603 {
 604         int i;
 605
 606         dst->nr_running         += je->nr_running;
 607         dst->nr_ramp            += je->nr_ramp;
 608         dst->nr_pending         += je->nr_pending;
 609         dst->files_open         += je->files_open;
 610         dst->m_rate             += je->m_rate;
 611         dst->t_rate             += je->t_rate;
 612         dst->m_iops             += je->m_iops;
 613         dst->t_iops             += je->t_iops;
 614
 615         for (i = 0; i < 2; i++) {
 616                 dst->rate[i]    += je->rate[i];
 617                 dst->iops[i]    += je->iops[i];
 618         }
 619
 620         dst->elapsed_sec        += je->elapsed_sec;
 621
 622         if (je->eta_sec > dst->eta_sec)
 623                 dst->eta_sec = je->eta_sec;
 624 }
 625
 626 static void dec_jobs_eta(struct client_eta *eta)
 627 {
 628         if (!--eta->pending) {
 629                 display_thread_status(&eta->eta);
 630                 free(eta);
 631         }
 632 }
 633
 634 static void handle_eta(struct fio_client *client, struct fio_net_cmd *cmd)
 635 {
 636         struct jobs_eta *je = (struct jobs_eta *) cmd->payload;
 637         struct client_eta *eta = (struct client_eta *) cmd->tag;
 638
 639         dprint(FD_NET, "client: got eta tag %p, %d\n", eta, eta->pending);
 640
 641         assert(client->eta_in_flight == eta);
 642
 643         client->eta_in_flight = NULL;
 644         flist_del_init(&client->eta_list);
 645
 646         convert_jobs_eta(je);
 647         sum_jobs_eta(&eta->eta, je);
 648         dec_jobs_eta(eta);
 649 }
 650
 651 static void handle_probe(struct fio_client *client, struct fio_net_cmd *cmd)
 652 {
 653         struct cmd_probe_pdu *probe = (struct cmd_probe_pdu *) cmd->payload;
 654         const char *os, *arch;
 655
 656         os = fio_get_os_string(probe->os);
 657         if (!os)
 658                 os = "unknown";
 659
 660         arch = fio_get_arch_string(probe->arch);
 661         if (!arch)
 662                 os = "unknown";
 663
 664         log_info("hostname=%s, be=%u, os=%s, arch=%s, fio=%u.%u.%u\n",
 665                 probe->hostname, probe->bigendian, os, arch, probe->fio_major,
 666                 probe->fio_minor, probe->fio_patch);
 667
 668         if (!client->name)
 669                 client->name = strdup((char *) probe->hostname);
 670 }
 671
 672 static int handle_client(struct fio_client *client)
 673 {
 674         struct fio_net_cmd *cmd;
 675
 676         dprint(FD_NET, "client: handle %s\n", client->hostname);
 677
 678         cmd = fio_net_recv_cmd(client->fd);
 679         if (!cmd)
 680                 return 0;
 681
 682         dprint(FD_NET, "client: got cmd op %d from %s\n",
 683                                         cmd->opcode, client->hostname);
 684
 685         switch (cmd->opcode) {
 686         case FIO_NET_CMD_QUIT:
 687                 remove_client(client);
 688                 free(cmd);
 689                 break;
 690         case FIO_NET_CMD_TEXT: {
 691                 const char *buf = (const char *) cmd->payload;
 692                 const char *name;
 693                 int fio_unused ret;
 694
 695                 name = client->name ? client->name : client->hostname;
 696
 697                 if (!client->skip_newline)
 698                         fprintf(f_out, "<%s> ", name);
 699                 ret = fwrite(buf, cmd->pdu_len, 1, f_out);
 700                 fflush(f_out);
 701                 client->skip_newline = strchr(buf, '\n') == NULL;
 702                 free(cmd);
 703                 break;
 704                 }
 705         case FIO_NET_CMD_TS:
 706                 handle_ts(cmd);
 707                 free(cmd);
 708                 break;
 709         case FIO_NET_CMD_GS:
 710                 handle_gs(cmd);
 711                 free(cmd);
 712                 break;
 713         case FIO_NET_CMD_ETA:
 714                 handle_eta(client, cmd);
 715                 free(cmd);
 716                 break;
 717         case FIO_NET_CMD_PROBE:
 718                 handle_probe(client, cmd);
 719                 free(cmd);
 720                 break;
 721         case FIO_NET_CMD_START:
 722                 client->state = Client_started;
 723                 free(cmd);
 724                 break;
 725         case FIO_NET_CMD_STOP:
 726                 client->state = Client_stopped;
 727                 free(cmd);
 728                 break;
 729         default:
 730                 log_err("fio: unknown client op: %d\n", cmd->opcode);
 731                 free(cmd);
 732                 break;
 733         }
 734
 735         return 1;
 736 }
 737
 738 static void request_client_etas(void)
 739 {
 740         struct fio_client *client;
 741         struct flist_head *entry;
 742         struct client_eta *eta;
 743         int skipped = 0;
 744
 745         dprint(FD_NET, "client: request eta (%d)\n", nr_clients);
 746
 747         eta = malloc(sizeof(*eta));
 748         memset(&eta->eta, 0, sizeof(eta->eta));
 749         eta->pending = nr_clients;
 750
 751         flist_for_each(entry, &client_list) {
 752                 client = flist_entry(entry, struct fio_client, list);
 753
 754                 if (!flist_empty(&client->eta_list)) {
 755                         skipped++;
 756                         continue;
 757                 }
 758
 759                 assert(!client->eta_in_flight);
 760                 flist_add_tail(&client->eta_list, &eta_list);
 761                 client->eta_in_flight = eta;
 762                 fio_net_send_simple_cmd(client->fd, FIO_NET_CMD_SEND_ETA,
 763                                                 (uint64_t) eta);
 764         }
 765
 766         while (skipped--)
 767                 dec_jobs_eta(eta);
 768
 769         dprint(FD_NET, "client: requested eta tag %p\n", eta);
 770 }
 771
 772 int fio_handle_clients(void)
 773 {
 774         struct fio_client *client;
 775         struct flist_head *entry;
 776         struct pollfd *pfds;
 777         int i, ret = 0;
 778
 779         gettimeofday(&eta_tv, NULL);
 780
 781         pfds = malloc(nr_clients * sizeof(struct pollfd));
 782
 783         while (!exit_backend && nr_clients) {
 784                 i = 0;
 785                 flist_for_each(entry, &client_list) {
 786                         client = flist_entry(entry, struct fio_client, list);
 787
 788                         pfds[i].fd = client->fd;
 789                         pfds[i].events = POLLIN;
 790                         i++;
 791                 }
 792
 793                 assert(i == nr_clients);
 794
 795                 do {
 796                         struct timeval tv;
 797
 798                         gettimeofday(&tv, NULL);
 799                         if (mtime_since(&eta_tv, &tv) >= 900) {
 800                                 request_client_etas();
 801                                 memcpy(&eta_tv, &tv, sizeof(tv));
 802                         }
 803
 804                         ret = poll(pfds, nr_clients, 100);
 805                         if (ret < 0) {
 806                                 if (errno == EINTR)
 807                                         continue;
 808                                 log_err("fio: poll clients: %s\n", strerror(errno));
 809                                 break;
 810                         } else if (!ret)
 811                                 continue;
 812                 } while (ret <= 0);
 813
 814                 for (i = 0; i < nr_clients; i++) {
 815                         if (!(pfds[i].revents & POLLIN))
 816                                 continue;
 817
 818                         client = find_client_by_fd(pfds[i].fd);
 819                         if (!client) {
 820                                 log_err("fio: unknown client fd %d\n", pfds[i].fd);
 821                                 continue;
 822                         }
 823                         if (!handle_client(client)) {
 824                                 log_info("client: host=%s disconnected\n",
 825                                                 client->hostname);
 826                                 remove_client(client);
 827                         }
 828                 }
 829         }
 830
 831         free(pfds);
 832         return 0;
 833 }