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