iolog.c

   1 /*
   2  * Code related to writing an iolog of what a thread is doing, and to
   3  * later read that back and replay
   4  */
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <assert.h>
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <unistd.h>
  11 #ifdef CONFIG_ZLIB
  12 #include <zlib.h>
  13 #endif
  14
  15 #include "flist.h"
  16 #include "fio.h"
  17 #include "trim.h"
  18 #include "filelock.h"
  19 #include "smalloc.h"
  20 #include "blktrace.h"
  21 #include "pshared.h"
  22 #include "lib/roundup.h"
  23
  24 #include <netinet/in.h>
  25 #include <netinet/tcp.h>
  26 #include <arpa/inet.h>
  27 #include <sys/stat.h>
  28 #include <sys/socket.h>
  29 #include <sys/un.h>
  30
  31 static int iolog_flush(struct io_log *log);
  32
  33 static const char iolog_ver2[] = "fio version 2 iolog";
  34 static const char iolog_ver3[] = "fio version 3 iolog";
  35
  36 void queue_io_piece(struct thread_data *td, struct io_piece *ipo)
  37 {
  38         flist_add_tail(&ipo->list, &td->io_log_list);
  39         td->total_io_size += ipo->len;
  40 }
  41
  42 void log_io_u(const struct thread_data *td, const struct io_u *io_u)
  43 {
  44         struct timespec now;
  45
  46         if (!td->o.write_iolog_file)
  47                 return;
  48
  49         fio_gettime(&now, NULL);
  50         fprintf(td->iolog_f, "%llu %s %s %llu %llu\n",
  51                 (unsigned long long) utime_since_now(&td->io_log_start_time),
  52                 io_u->file->file_name, io_ddir_name(io_u->ddir), io_u->offset,
  53                 io_u->buflen);
  54
  55 }
  56
  57 void log_file(struct thread_data *td, struct fio_file *f,
  58               enum file_log_act what)
  59 {
  60         const char *act[] = { "add", "open", "close" };
  61         struct timespec now;
  62
  63         assert(what < 3);
  64
  65         if (!td->o.write_iolog_file)
  66                 return;
  67
  68
  69         /*
  70          * this happens on the pre-open/close done before the job starts
  71          */
  72         if (!td->iolog_f)
  73                 return;
  74
  75         fio_gettime(&now, NULL);
  76         fprintf(td->iolog_f, "%llu %s %s\n",
  77                 (unsigned long long) utime_since_now(&td->io_log_start_time),
  78                 f->file_name, act[what]);
  79 }
  80
  81 static void iolog_delay(struct thread_data *td, unsigned long delay)
  82 {
  83         uint64_t usec = utime_since_now(&td->last_issue);
  84         unsigned long orig_delay = delay;
  85         uint64_t this_delay;
  86         struct timespec ts;
  87
  88         if (delay < td->time_offset) {
  89                 td->time_offset = 0;
  90                 return;
  91         }
  92
  93         delay -= td->time_offset;
  94         if (delay < usec)
  95                 return;
  96
  97         delay -= usec;
  98
  99         fio_gettime(&ts, NULL);
 100         while (delay && !td->terminate) {
 101                 this_delay = delay;
 102                 if (this_delay > 500000)
 103                         this_delay = 500000;
 104
 105                 usec_sleep(td, this_delay);
 106                 delay -= this_delay;
 107         }
 108
 109         usec = utime_since_now(&ts);
 110         if (usec > orig_delay)
 111                 td->time_offset = usec - orig_delay;
 112         else
 113                 td->time_offset = 0;
 114 }
 115
 116 static int ipo_special(struct thread_data *td, struct io_piece *ipo)
 117 {
 118         struct fio_file *f;
 119         int ret;
 120
 121         /*
 122          * Not a special ipo
 123          */
 124         if (ipo->ddir != DDIR_INVAL)
 125                 return 0;
 126
 127         f = td->files[ipo->fileno];
 128
 129         if (ipo->delay)
 130                 iolog_delay(td, ipo->delay);
 131         if (fio_fill_issue_time(td))
 132                 fio_gettime(&td->last_issue, NULL);
 133         switch (ipo->file_action) {
 134         case FIO_LOG_OPEN_FILE:
 135                 if (td->o.replay_redirect && fio_file_open(f)) {
 136                         dprint(FD_FILE, "iolog: ignoring re-open of file %s\n",
 137                                         f->file_name);
 138                         break;
 139                 }
 140                 ret = td_io_open_file(td, f);
 141                 if (!ret)
 142                         break;
 143                 td_verror(td, ret, "iolog open file");
 144                 return -1;
 145         case FIO_LOG_CLOSE_FILE:
 146                 td_io_close_file(td, f);
 147                 break;
 148         case FIO_LOG_UNLINK_FILE:
 149                 td_io_unlink_file(td, f);
 150                 break;
 151         case FIO_LOG_ADD_FILE:
 152                 /*
 153                  * Nothing to do
 154                  */
 155                 break;
 156         default:
 157                 log_err("fio: bad file action %d\n", ipo->file_action);
 158                 break;
 159         }
 160
 161         return 1;
 162 }
 163
 164 static bool read_iolog(struct thread_data *td);
 165
 166 unsigned long long delay_since_ttime(const struct thread_data *td,
 167                unsigned long long time)
 168 {
 169         double tmp;
 170         double scale;
 171         const unsigned long long *last_ttime = &td->io_log_last_ttime;
 172
 173         if (!*last_ttime || td->o.no_stall || time < *last_ttime)
 174                 return 0;
 175         else if (td->o.replay_time_scale == 100)
 176                 return time - *last_ttime;
 177
 178
 179         scale = (double) 100.0 / (double) td->o.replay_time_scale;
 180         tmp = time - *last_ttime;
 181         return tmp * scale;
 182 }
 183
 184 int read_iolog_get(struct thread_data *td, struct io_u *io_u)
 185 {
 186         struct io_piece *ipo;
 187         unsigned long elapsed;
 188
 189         while (!flist_empty(&td->io_log_list)) {
 190                 int ret;
 191
 192                 if (td->o.read_iolog_chunked) {
 193                         if (td->io_log_checkmark == td->io_log_current) {
 194                                 if (td->io_log_blktrace) {
 195                                         if (!read_blktrace(td))
 196                                                 return 1;
 197                                 } else {
 198                                         if (!read_iolog(td))
 199                                                 return 1;
 200                                 }
 201                         }
 202                         td->io_log_current--;
 203                 }
 204                 ipo = flist_first_entry(&td->io_log_list, struct io_piece, list);
 205                 flist_del(&ipo->list);
 206                 remove_trim_entry(td, ipo);
 207
 208                 ret = ipo_special(td, ipo);
 209                 if (ret < 0) {
 210                         free(ipo);
 211                         break;
 212                 } else if (ret > 0) {
 213                         free(ipo);
 214                         continue;
 215                 }
 216
 217                 io_u->ddir = ipo->ddir;
 218                 if (ipo->ddir != DDIR_WAIT) {
 219                         io_u->offset = ipo->offset;
 220                         io_u->verify_offset = ipo->offset;
 221                         io_u->buflen = ipo->len;
 222                         io_u->file = td->files[ipo->fileno];
 223                         get_file(io_u->file);
 224                         dprint(FD_IO, "iolog: get %llu/%llu/%s\n", io_u->offset,
 225                                                 io_u->buflen, io_u->file->file_name);
 226                         if (ipo->delay)
 227                                 iolog_delay(td, ipo->delay);
 228                 } else {
 229                         elapsed = mtime_since_genesis();
 230                         if (ipo->delay > elapsed)
 231                                 usec_sleep(td, (ipo->delay - elapsed) * 1000);
 232                 }
 233
 234                 free(ipo);
 235
 236                 if (io_u->ddir != DDIR_WAIT)
 237                         return 0;
 238         }
 239
 240         td->done = 1;
 241         return 1;
 242 }
 243
 244 void prune_io_piece_log(struct thread_data *td)
 245 {
 246         struct io_piece *ipo;
 247         struct fio_rb_node *n;
 248
 249         while ((n = rb_first(&td->io_hist_tree)) != NULL) {
 250                 ipo = rb_entry(n, struct io_piece, rb_node);
 251                 rb_erase(n, &td->io_hist_tree);
 252                 remove_trim_entry(td, ipo);
 253                 td->io_hist_len--;
 254                 free(ipo);
 255         }
 256
 257         while (!flist_empty(&td->io_hist_list)) {
 258                 ipo = flist_first_entry(&td->io_hist_list, struct io_piece, list);
 259                 flist_del(&ipo->list);
 260                 remove_trim_entry(td, ipo);
 261                 td->io_hist_len--;
 262                 free(ipo);
 263         }
 264 }
 265
 266 /*
 267  * log a successful write, so we can unwind the log for verify
 268  */
 269 void log_io_piece(struct thread_data *td, struct io_u *io_u)
 270 {
 271         struct fio_rb_node **p, *parent;
 272         struct io_piece *ipo, *__ipo;
 273
 274         ipo = calloc(1, sizeof(struct io_piece));
 275         init_ipo(ipo);
 276         ipo->file = io_u->file;
 277         ipo->offset = io_u->offset;
 278         ipo->len = io_u->buflen;
 279         ipo->numberio = io_u->numberio;
 280         ipo->flags = IP_F_IN_FLIGHT;
 281
 282         io_u->ipo = ipo;
 283
 284         if (io_u_should_trim(td, io_u)) {
 285                 flist_add_tail(&ipo->trim_list, &td->trim_list);
 286                 td->trim_entries++;
 287         }
 288
 289         /*
 290          * Only sort writes if we don't have a random map in which case we need
 291          * to check for duplicate blocks and drop the old one, which we rely on
 292          * the rb insert/lookup for handling.
 293          */
 294         if (file_randommap(td, ipo->file)) {
 295                 INIT_FLIST_HEAD(&ipo->list);
 296                 flist_add_tail(&ipo->list, &td->io_hist_list);
 297                 ipo->flags |= IP_F_ONLIST;
 298                 td->io_hist_len++;
 299                 return;
 300         }
 301
 302         RB_CLEAR_NODE(&ipo->rb_node);
 303
 304         /*
 305          * Sort the entry into the verification list
 306          */
 307 restart:
 308         p = &td->io_hist_tree.rb_node;
 309         parent = NULL;
 310         while (*p) {
 311                 int overlap = 0;
 312                 parent = *p;
 313
 314                 __ipo = rb_entry(parent, struct io_piece, rb_node);
 315                 if (ipo->file < __ipo->file)
 316                         p = &(*p)->rb_left;
 317                 else if (ipo->file > __ipo->file)
 318                         p = &(*p)->rb_right;
 319                 else if (ipo->offset < __ipo->offset) {
 320                         p = &(*p)->rb_left;
 321                         overlap = ipo->offset + ipo->len > __ipo->offset;
 322                 }
 323                 else if (ipo->offset > __ipo->offset) {
 324                         p = &(*p)->rb_right;
 325                         overlap = __ipo->offset + __ipo->len > ipo->offset;
 326                 }
 327                 else
 328                         overlap = 1;
 329
 330                 if (overlap) {
 331                         dprint(FD_IO, "iolog: overlap %llu/%lu, %llu/%lu\n",
 332                                 __ipo->offset, __ipo->len,
 333                                 ipo->offset, ipo->len);
 334                         td->io_hist_len--;
 335                         rb_erase(parent, &td->io_hist_tree);
 336                         remove_trim_entry(td, __ipo);
 337                         if (!(__ipo->flags & IP_F_IN_FLIGHT))
 338                                 free(__ipo);
 339                         goto restart;
 340                 }
 341         }
 342
 343         rb_link_node(&ipo->rb_node, parent, p);
 344         rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
 345         ipo->flags |= IP_F_ONRB;
 346         td->io_hist_len++;
 347 }
 348
 349 void unlog_io_piece(struct thread_data *td, struct io_u *io_u)
 350 {
 351         struct io_piece *ipo = io_u->ipo;
 352
 353         if (td->ts.nr_block_infos) {
 354                 uint32_t *info = io_u_block_info(td, io_u);
 355                 if (BLOCK_INFO_STATE(*info) < BLOCK_STATE_TRIM_FAILURE) {
 356                         if (io_u->ddir == DDIR_TRIM)
 357                                 *info = BLOCK_INFO_SET_STATE(*info,
 358                                                 BLOCK_STATE_TRIM_FAILURE);
 359                         else if (io_u->ddir == DDIR_WRITE)
 360                                 *info = BLOCK_INFO_SET_STATE(*info,
 361                                                 BLOCK_STATE_WRITE_FAILURE);
 362                 }
 363         }
 364
 365         if (!ipo)
 366                 return;
 367
 368         if (ipo->flags & IP_F_ONRB)
 369                 rb_erase(&ipo->rb_node, &td->io_hist_tree);
 370         else if (ipo->flags & IP_F_ONLIST)
 371                 flist_del(&ipo->list);
 372
 373         free(ipo);
 374         io_u->ipo = NULL;
 375         td->io_hist_len--;
 376 }
 377
 378 void trim_io_piece(const struct io_u *io_u)
 379 {
 380         struct io_piece *ipo = io_u->ipo;
 381
 382         if (!ipo)
 383                 return;
 384
 385         ipo->len = io_u->xfer_buflen - io_u->resid;
 386 }
 387
 388 void write_iolog_close(struct thread_data *td)
 389 {
 390         if (!td->iolog_f)
 391                 return;
 392
 393         fflush(td->iolog_f);
 394         fclose(td->iolog_f);
 395         free(td->iolog_buf);
 396         td->iolog_f = NULL;
 397         td->iolog_buf = NULL;
 398 }
 399
 400 int64_t iolog_items_to_fetch(struct thread_data *td)
 401 {
 402         struct timespec now;
 403         uint64_t elapsed;
 404         uint64_t for_1s;
 405         int64_t items_to_fetch;
 406
 407         if (!td->io_log_highmark)
 408                 return 10;
 409
 410
 411         fio_gettime(&now, NULL);
 412         elapsed = ntime_since(&td->io_log_highmark_time, &now);
 413         if (elapsed) {
 414                 for_1s = (td->io_log_highmark - td->io_log_current) * 1000000000 / elapsed;
 415                 items_to_fetch = for_1s - td->io_log_current;
 416                 if (items_to_fetch < 0)
 417                         items_to_fetch = 0;
 418         } else
 419                 items_to_fetch = 0;
 420
 421         td->io_log_highmark = td->io_log_current + items_to_fetch;
 422         td->io_log_checkmark = (td->io_log_highmark + 1) / 2;
 423         fio_gettime(&td->io_log_highmark_time, NULL);
 424
 425         return items_to_fetch;
 426 }
 427
 428 #define io_act(_td, _r) (((_td)->io_log_version == 3 && (r) == 5) || \
 429                                         ((_td)->io_log_version == 2 && (r) == 4))
 430 #define file_act(_td, _r) (((_td)->io_log_version == 3 && (r) == 3) || \
 431                                         ((_td)->io_log_version == 2 && (r) == 2))
 432
 433 /*
 434  * Read version 2 and 3 iolog data. It is enhanced to include per-file logging,
 435  * syncs, etc.
 436  */
 437 static bool read_iolog(struct thread_data *td)
 438 {
 439         unsigned long long offset;
 440         unsigned int bytes;
 441         unsigned long long delay = 0;
 442         int reads, writes, trims, waits, fileno = 0, file_action = 0; /* stupid gcc */
 443         char *rfname, *fname, *act;
 444         char *str, *p;
 445         enum fio_ddir rw;
 446         bool realloc = false;
 447         int64_t items_to_fetch = 0;
 448         int syncs;
 449
 450         if (td->o.read_iolog_chunked) {
 451                 items_to_fetch = iolog_items_to_fetch(td);
 452                 if (!items_to_fetch)
 453                         return true;
 454         }
 455
 456         /*
 457          * Read in the read iolog and store it, reuse the infrastructure
 458          * for doing verifications.
 459          */
 460         str = malloc(4096);
 461         rfname = fname = malloc(256+16);
 462         act = malloc(256+16);
 463
 464         syncs = reads = writes = trims = waits = 0;
 465         while ((p = fgets(str, 4096, td->io_log_rfile)) != NULL) {
 466                 struct io_piece *ipo;
 467                 int r;
 468                 unsigned long long ttime;
 469
 470                 if (td->io_log_version == 3) {
 471                         r = sscanf(p, "%llu %256s %256s %llu %u", &ttime, rfname, act,
 472                                                         &offset, &bytes);
 473                         delay = delay_since_ttime(td, ttime);
 474                         td->io_log_last_ttime = ttime;
 475                         /*
 476                          * "wait" is not allowed with version 3
 477                          */
 478                         if (!strcmp(act, "wait")) {
 479                                 log_err("iolog: ignoring wait command with"
 480                                         " version 3 for file %s\n", fname);
 481                                 continue;
 482                         }
 483                 } else /* version 2 */
 484                         r = sscanf(p, "%256s %256s %llu %u", rfname, act, &offset, &bytes);
 485
 486                 if (td->o.replay_redirect)
 487                         fname = td->o.replay_redirect;
 488
 489                 if (io_act(td, r)) {
 490                         /*
 491                          * Check action first
 492                          */
 493                         if (!strcmp(act, "wait"))
 494                                 rw = DDIR_WAIT;
 495                         else if (!strcmp(act, "read")) {
 496                                 if (td->o.replay_skip & (1u << DDIR_READ))
 497                                         continue;
 498                                 rw = DDIR_READ;
 499                         } else if (!strcmp(act, "write")) {
 500                                 if (td->o.replay_skip & (1u << DDIR_WRITE))
 501                                         continue;
 502                                 rw = DDIR_WRITE;
 503                         } else if (!strcmp(act, "sync")) {
 504                                 if (td->o.replay_skip & (1u << DDIR_SYNC))
 505                                         continue;
 506                                 rw = DDIR_SYNC;
 507                         } else if (!strcmp(act, "datasync"))
 508                                 rw = DDIR_DATASYNC;
 509                         else if (!strcmp(act, "trim")) {
 510                                 if (td->o.replay_skip & (1u << DDIR_TRIM))
 511                                         continue;
 512                                 rw = DDIR_TRIM;
 513                         } else {
 514                                 log_err("fio: bad iolog file action: %s\n",
 515                                                                         act);
 516                                 continue;
 517                         }
 518                         fileno = get_fileno(td, fname);
 519                 } else if (file_act(td, r)) {
 520                         rw = DDIR_INVAL;
 521                         if (!strcmp(act, "add")) {
 522                                 if (td->o.replay_redirect &&
 523                                     get_fileno(td, fname) != -1) {
 524                                         dprint(FD_FILE, "iolog: ignoring"
 525                                                 " re-add of file %s\n", fname);
 526                                 } else {
 527                                         fileno = add_file(td, fname, td->subjob_number, 1);
 528                                         file_action = FIO_LOG_ADD_FILE;
 529                                 }
 530                         } else if (!strcmp(act, "open")) {
 531                                 fileno = get_fileno(td, fname);
 532                                 file_action = FIO_LOG_OPEN_FILE;
 533                         } else if (!strcmp(act, "close")) {
 534                                 fileno = get_fileno(td, fname);
 535                                 file_action = FIO_LOG_CLOSE_FILE;
 536                         } else {
 537                                 log_err("fio: bad iolog file action: %s\n",
 538                                                                         act);
 539                                 continue;
 540                         }
 541                 } else {
 542                         log_err("bad iolog%d: %s\n", td->io_log_version, p);
 543                         continue;
 544                 }
 545
 546                 if (rw == DDIR_READ)
 547                         reads++;
 548                 else if (rw == DDIR_WRITE) {
 549                         /*
 550                          * Don't add a write for ro mode
 551                          */
 552                         if (read_only)
 553                                 continue;
 554                         writes++;
 555                 } else if (rw == DDIR_TRIM) {
 556                         /*
 557                          * Don't add a trim for ro mode
 558                          */
 559                         if (read_only)
 560                                 continue;
 561                         trims++;
 562                 } else if (rw == DDIR_WAIT) {
 563                         if (td->o.no_stall)
 564                                 continue;
 565                         waits++;
 566                 } else if (rw == DDIR_INVAL) {
 567                 } else if (ddir_sync(rw)) {
 568                         syncs++;
 569                 } else {
 570                         log_err("bad ddir: %d\n", rw);
 571                         continue;
 572                 }
 573
 574                 /*
 575                  * Make note of file
 576                  */
 577                 ipo = calloc(1, sizeof(*ipo));
 578                 init_ipo(ipo);
 579                 ipo->ddir = rw;
 580                 if (td->io_log_version == 3)
 581                         ipo->delay = delay;
 582                 if (rw == DDIR_WAIT) {
 583                         ipo->delay = offset;
 584                 } else {
 585                         if (td->o.replay_scale)
 586                                 ipo->offset = offset / td->o.replay_scale;
 587                         else
 588                                 ipo->offset = offset;
 589                         ipo_bytes_align(td->o.replay_align, ipo);
 590
 591                         ipo->len = bytes;
 592                         if (rw != DDIR_INVAL && bytes > td->o.max_bs[rw]) {
 593                                 realloc = true;
 594                                 td->o.max_bs[rw] = bytes;
 595                         }
 596                         ipo->fileno = fileno;
 597                         ipo->file_action = file_action;
 598                         td->o.size += bytes;
 599                 }
 600
 601                 queue_io_piece(td, ipo);
 602
 603                 if (td->o.read_iolog_chunked) {
 604                         td->io_log_current++;
 605                         items_to_fetch--;
 606                         if (items_to_fetch == 0)
 607                                 break;
 608                 }
 609         }
 610
 611         free(str);
 612         free(act);
 613         free(rfname);
 614
 615         if (td->o.read_iolog_chunked) {
 616                 td->io_log_highmark = td->io_log_current;
 617                 td->io_log_checkmark = (td->io_log_highmark + 1) / 2;
 618                 fio_gettime(&td->io_log_highmark_time, NULL);
 619         }
 620
 621         if (writes && read_only) {
 622                 log_err("fio: <%s> skips replay of %d writes due to"
 623                         " read-only\n", td->o.name, writes);
 624                 writes = 0;
 625         }
 626         if (syncs)
 627                 td->flags |= TD_F_SYNCS;
 628
 629         if (td->o.read_iolog_chunked) {
 630                 if (td->io_log_current == 0) {
 631                         return false;
 632                 }
 633                 td->o.td_ddir = TD_DDIR_RW;
 634                 if (realloc && td->orig_buffer)
 635                 {
 636                         io_u_quiesce(td);
 637                         free_io_mem(td);
 638                         if (init_io_u_buffers(td))
 639                                 return false;
 640                 }
 641                 return true;
 642         }
 643
 644         if (!reads && !writes && !waits && !trims)
 645                 return false;
 646
 647         td->o.td_ddir = 0;
 648         if (reads)
 649                 td->o.td_ddir |= TD_DDIR_READ;
 650         if (writes)
 651                 td->o.td_ddir |= TD_DDIR_WRITE;
 652         if (trims)
 653                 td->o.td_ddir |= TD_DDIR_TRIM;
 654
 655         return true;
 656 }
 657
 658 static bool is_socket(const char *path)
 659 {
 660         struct stat buf;
 661         int r;
 662
 663         r = stat(path, &buf);
 664         if (r == -1)
 665                 return false;
 666
 667         return S_ISSOCK(buf.st_mode);
 668 }
 669
 670 static int open_socket(const char *path)
 671 {
 672         struct sockaddr_un addr;
 673         int ret, fd;
 674
 675         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 676         if (fd < 0)
 677                 return fd;
 678
 679         addr.sun_family = AF_UNIX;
 680         if (snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", path) >=
 681             sizeof(addr.sun_path)) {
 682                 log_err("%s: path name %s is too long for a Unix socket\n",
 683                         __func__, path);
 684         }
 685
 686         ret = connect(fd, (const struct sockaddr *)&addr, strlen(path) + sizeof(addr.sun_family));
 687         if (!ret)
 688                 return fd;
 689
 690         close(fd);
 691         return -1;
 692 }
 693
 694 /*
 695  * open iolog, check version, and call appropriate parser
 696  */
 697 static bool init_iolog_read(struct thread_data *td, char *fname)
 698 {
 699         char buffer[256], *p;
 700         FILE *f = NULL;
 701
 702         dprint(FD_IO, "iolog: name=%s\n", fname);
 703
 704         if (is_socket(fname)) {
 705                 int fd;
 706
 707                 fd = open_socket(fname);
 708                 if (fd >= 0)
 709                         f = fdopen(fd, "r");
 710         } else if (!strcmp(fname, "-")) {
 711                 f = stdin;
 712         } else
 713                 f = fopen(fname, "r");
 714
 715         if (!f) {
 716                 perror("fopen read iolog");
 717                 return false;
 718         }
 719
 720         p = fgets(buffer, sizeof(buffer), f);
 721         if (!p) {
 722                 td_verror(td, errno, "iolog read");
 723                 log_err("fio: unable to read iolog\n");
 724                 fclose(f);
 725                 return false;
 726         }
 727
 728         /*
 729          * versions 2 and 3 of the iolog store a specific string as the
 730          * first line, check for that
 731          */
 732         if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
 733                 td->io_log_version = 2;
 734         else if (!strncmp(iolog_ver3, buffer, strlen(iolog_ver3)))
 735                 td->io_log_version = 3;
 736         else {
 737                 log_err("fio: iolog version 1 is no longer supported\n");
 738                 fclose(f);
 739                 return false;
 740         }
 741
 742         free_release_files(td);
 743         td->io_log_rfile = f;
 744         return read_iolog(td);
 745 }
 746
 747 /*
 748  * Set up a log for storing io patterns.
 749  */
 750 static bool init_iolog_write(struct thread_data *td)
 751 {
 752         struct fio_file *ff;
 753         FILE *f;
 754         unsigned int i;
 755
 756         f = fopen(td->o.write_iolog_file, "a");
 757         if (!f) {
 758                 perror("fopen write iolog");
 759                 return false;
 760         }
 761
 762         /*
 763          * That's it for writing, setup a log buffer and we're done.
 764           */
 765         td->iolog_f = f;
 766         td->iolog_buf = malloc(8192);
 767         setvbuf(f, td->iolog_buf, _IOFBF, 8192);
 768         fio_gettime(&td->io_log_start_time, NULL);
 769
 770         /*
 771          * write our version line
 772          */
 773         if (fprintf(f, "%s\n", iolog_ver3) < 0) {
 774                 perror("iolog init\n");
 775                 return false;
 776         }
 777
 778         /*
 779          * add all known files
 780          */
 781         for_each_file(td, ff, i)
 782                 log_file(td, ff, FIO_LOG_ADD_FILE);
 783
 784         return true;
 785 }
 786
 787 bool init_iolog(struct thread_data *td)
 788 {
 789         bool ret;
 790
 791         if (td->o.read_iolog_file) {
 792                 int need_swap;
 793                 char * fname = get_name_by_idx(td->o.read_iolog_file, td->subjob_number);
 794
 795                 /*
 796                  * Check if it's a blktrace file and load that if possible.
 797                  * Otherwise assume it's a normal log file and load that.
 798                  */
 799                 if (is_blktrace(fname, &need_swap)) {
 800                         td->io_log_blktrace = 1;
 801                         ret = init_blktrace_read(td, fname, need_swap);
 802                 } else {
 803                         td->io_log_blktrace = 0;
 804                         ret = init_iolog_read(td, fname);
 805                 }
 806                 free(fname);
 807         } else if (td->o.write_iolog_file)
 808                 ret = init_iolog_write(td);
 809         else
 810                 ret = true;
 811
 812         if (!ret)
 813                 td_verror(td, EINVAL, "failed initializing iolog");
 814
 815         return ret;
 816 }
 817
 818 void setup_log(struct io_log **log, struct log_params *p,
 819                const char *filename)
 820 {
 821         struct io_log *l;
 822         int i;
 823         struct io_u_plat_entry *entry;
 824         struct flist_head *list;
 825
 826         l = scalloc(1, sizeof(*l));
 827         INIT_FLIST_HEAD(&l->io_logs);
 828         l->log_type = p->log_type;
 829         l->log_offset = p->log_offset;
 830         l->log_prio = p->log_prio;
 831         l->log_gz = p->log_gz;
 832         l->log_gz_store = p->log_gz_store;
 833         l->avg_msec = p->avg_msec;
 834         l->hist_msec = p->hist_msec;
 835         l->hist_coarseness = p->hist_coarseness;
 836         l->filename = strdup(filename);
 837         l->td = p->td;
 838
 839         /* Initialize histogram lists for each r/w direction,
 840          * with initial io_u_plat of all zeros:
 841          */
 842         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 843                 list = &l->hist_window[i].list;
 844                 INIT_FLIST_HEAD(list);
 845                 entry = calloc(1, sizeof(struct io_u_plat_entry));
 846                 flist_add(&entry->list, list);
 847         }
 848
 849         if (l->td && l->td->o.io_submit_mode != IO_MODE_OFFLOAD) {
 850                 unsigned int def_samples = DEF_LOG_ENTRIES;
 851                 struct io_logs *__p;
 852
 853                 __p = calloc(1, sizeof(*l->pending));
 854                 if (l->td->o.iodepth > DEF_LOG_ENTRIES)
 855                         def_samples = roundup_pow2(l->td->o.iodepth);
 856                 __p->max_samples = def_samples;
 857                 __p->log = calloc(__p->max_samples, log_entry_sz(l));
 858                 l->pending = __p;
 859         }
 860
 861         if (l->log_offset)
 862                 l->log_ddir_mask = LOG_OFFSET_SAMPLE_BIT;
 863         if (l->log_prio)
 864                 l->log_ddir_mask |= LOG_PRIO_SAMPLE_BIT;
 865
 866         INIT_FLIST_HEAD(&l->chunk_list);
 867
 868         if (l->log_gz && !p->td)
 869                 l->log_gz = 0;
 870         else if (l->log_gz || l->log_gz_store) {
 871                 mutex_init_pshared(&l->chunk_lock);
 872                 mutex_init_pshared(&l->deferred_free_lock);
 873                 p->td->flags |= TD_F_COMPRESS_LOG;
 874         }
 875
 876         *log = l;
 877 }
 878
 879 #ifdef CONFIG_SETVBUF
 880 static void *set_file_buffer(FILE *f)
 881 {
 882         size_t size = 1048576;
 883         void *buf;
 884
 885         buf = malloc(size);
 886         setvbuf(f, buf, _IOFBF, size);
 887         return buf;
 888 }
 889
 890 static void clear_file_buffer(void *buf)
 891 {
 892         free(buf);
 893 }
 894 #else
 895 static void *set_file_buffer(FILE *f)
 896 {
 897         return NULL;
 898 }
 899
 900 static void clear_file_buffer(void *buf)
 901 {
 902 }
 903 #endif
 904
 905 void free_log(struct io_log *log)
 906 {
 907         while (!flist_empty(&log->io_logs)) {
 908                 struct io_logs *cur_log;
 909
 910                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
 911                 flist_del_init(&cur_log->list);
 912                 free(cur_log->log);
 913                 sfree(cur_log);
 914         }
 915
 916         if (log->pending) {
 917                 free(log->pending->log);
 918                 free(log->pending);
 919                 log->pending = NULL;
 920         }
 921
 922         free(log->pending);
 923         free(log->filename);
 924         sfree(log);
 925 }
 926
 927 uint64_t hist_sum(int j, int stride, uint64_t *io_u_plat,
 928                 uint64_t *io_u_plat_last)
 929 {
 930         uint64_t sum;
 931         int k;
 932
 933         if (io_u_plat_last) {
 934                 for (k = sum = 0; k < stride; k++)
 935                         sum += io_u_plat[j + k] - io_u_plat_last[j + k];
 936         } else {
 937                 for (k = sum = 0; k < stride; k++)
 938                         sum += io_u_plat[j + k];
 939         }
 940
 941         return sum;
 942 }
 943
 944 static void flush_hist_samples(FILE *f, int hist_coarseness, void *samples,
 945                                uint64_t sample_size)
 946 {
 947         struct io_sample *s;
 948         int log_offset;
 949         uint64_t i, j, nr_samples;
 950         struct io_u_plat_entry *entry, *entry_before;
 951         uint64_t *io_u_plat;
 952         uint64_t *io_u_plat_before;
 953
 954         int stride = 1 << hist_coarseness;
 955
 956         if (!sample_size)
 957                 return;
 958
 959         s = __get_sample(samples, 0, 0);
 960         log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
 961
 962         nr_samples = sample_size / __log_entry_sz(log_offset);
 963
 964         for (i = 0; i < nr_samples; i++) {
 965                 s = __get_sample(samples, log_offset, i);
 966
 967                 entry = s->data.plat_entry;
 968                 io_u_plat = entry->io_u_plat;
 969
 970                 entry_before = flist_first_entry(&entry->list, struct io_u_plat_entry, list);
 971                 io_u_plat_before = entry_before->io_u_plat;
 972
 973                 fprintf(f, "%lu, %u, %llu, ", (unsigned long) s->time,
 974                                                 io_sample_ddir(s), (unsigned long long) s->bs);
 975                 for (j = 0; j < FIO_IO_U_PLAT_NR - stride; j += stride) {
 976                         fprintf(f, "%llu, ", (unsigned long long)
 977                                 hist_sum(j, stride, io_u_plat, io_u_plat_before));
 978                 }
 979                 fprintf(f, "%llu\n", (unsigned long long)
 980                         hist_sum(FIO_IO_U_PLAT_NR - stride, stride, io_u_plat,
 981                                         io_u_plat_before));
 982
 983                 flist_del(&entry_before->list);
 984                 free(entry_before);
 985         }
 986 }
 987
 988 void flush_samples(FILE *f, void *samples, uint64_t sample_size)
 989 {
 990         struct io_sample *s;
 991         int log_offset, log_prio;
 992         uint64_t i, nr_samples;
 993         unsigned int prio_val;
 994         const char *fmt;
 995
 996         if (!sample_size)
 997                 return;
 998
 999         s = __get_sample(samples, 0, 0);
1000         log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
1001         log_prio = (s->__ddir & LOG_PRIO_SAMPLE_BIT) != 0;
1002
1003         if (log_offset) {
1004                 if (log_prio)
1005                         fmt = "%lu, %" PRId64 ", %u, %llu, %llu, 0x%04x\n";
1006                 else
1007                         fmt = "%lu, %" PRId64 ", %u, %llu, %llu, %u\n";
1008         } else {
1009                 if (log_prio)
1010                         fmt = "%lu, %" PRId64 ", %u, %llu, 0x%04x\n";
1011                 else
1012                         fmt = "%lu, %" PRId64 ", %u, %llu, %u\n";
1013         }
1014
1015         nr_samples = sample_size / __log_entry_sz(log_offset);
1016
1017         for (i = 0; i < nr_samples; i++) {
1018                 s = __get_sample(samples, log_offset, i);
1019
1020                 if (log_prio)
1021                         prio_val = s->priority;
1022                 else
1023                         prio_val = ioprio_value_is_class_rt(s->priority);
1024
1025                 if (!log_offset) {
1026                         fprintf(f, fmt,
1027                                 (unsigned long) s->time,
1028                                 s->data.val,
1029                                 io_sample_ddir(s), (unsigned long long) s->bs,
1030                                 prio_val);
1031                 } else {
1032                         struct io_sample_offset *so = (void *) s;
1033
1034                         fprintf(f, fmt,
1035                                 (unsigned long) s->time,
1036                                 s->data.val,
1037                                 io_sample_ddir(s), (unsigned long long) s->bs,
1038                                 (unsigned long long) so->offset,
1039                                 prio_val);
1040                 }
1041         }
1042 }
1043
1044 #ifdef CONFIG_ZLIB
1045
1046 struct iolog_flush_data {
1047         struct workqueue_work work;
1048         struct io_log *log;
1049         void *samples;
1050         uint32_t nr_samples;
1051         bool free;
1052 };
1053
1054 #define GZ_CHUNK        131072
1055
1056 static struct iolog_compress *get_new_chunk(unsigned int seq)
1057 {
1058         struct iolog_compress *c;
1059
1060         c = malloc(sizeof(*c));
1061         INIT_FLIST_HEAD(&c->list);
1062         c->buf = malloc(GZ_CHUNK);
1063         c->len = 0;
1064         c->seq = seq;
1065         return c;
1066 }
1067
1068 static void free_chunk(struct iolog_compress *ic)
1069 {
1070         free(ic->buf);
1071         free(ic);
1072 }
1073
1074 static int z_stream_init(z_stream *stream, int gz_hdr)
1075 {
1076         int wbits = 15;
1077
1078         memset(stream, 0, sizeof(*stream));
1079         stream->zalloc = Z_NULL;
1080         stream->zfree = Z_NULL;
1081         stream->opaque = Z_NULL;
1082         stream->next_in = Z_NULL;
1083
1084         /*
1085          * zlib magic - add 32 for auto-detection of gz header or not,
1086          * if we decide to store files in a gzip friendly format.
1087          */
1088         if (gz_hdr)
1089                 wbits += 32;
1090
1091         if (inflateInit2(stream, wbits) != Z_OK)
1092                 return 1;
1093
1094         return 0;
1095 }
1096
1097 struct inflate_chunk_iter {
1098         unsigned int seq;
1099         int err;
1100         void *buf;
1101         size_t buf_size;
1102         size_t buf_used;
1103         size_t chunk_sz;
1104 };
1105
1106 static void finish_chunk(z_stream *stream, FILE *f,
1107                          struct inflate_chunk_iter *iter)
1108 {
1109         int ret;
1110
1111         ret = inflateEnd(stream);
1112         if (ret != Z_OK)
1113                 log_err("fio: failed to end log inflation seq %d (%d)\n",
1114                                 iter->seq, ret);
1115
1116         flush_samples(f, iter->buf, iter->buf_used);
1117         free(iter->buf);
1118         iter->buf = NULL;
1119         iter->buf_size = iter->buf_used = 0;
1120 }
1121
1122 /*
1123  * Iterative chunk inflation. Handles cases where we cross into a new
1124  * sequence, doing flush finish of previous chunk if needed.
1125  */
1126 static size_t inflate_chunk(struct iolog_compress *ic, int gz_hdr, FILE *f,
1127                             z_stream *stream, struct inflate_chunk_iter *iter)
1128 {
1129         size_t ret;
1130
1131         dprint(FD_COMPRESS, "inflate chunk size=%lu, seq=%u\n",
1132                                 (unsigned long) ic->len, ic->seq);
1133
1134         if (ic->seq != iter->seq) {
1135                 if (iter->seq)
1136                         finish_chunk(stream, f, iter);
1137
1138                 z_stream_init(stream, gz_hdr);
1139                 iter->seq = ic->seq;
1140         }
1141
1142         stream->avail_in = ic->len;
1143         stream->next_in = ic->buf;
1144
1145         if (!iter->buf_size) {
1146                 iter->buf_size = iter->chunk_sz;
1147                 iter->buf = malloc(iter->buf_size);
1148         }
1149
1150         while (stream->avail_in) {
1151                 size_t this_out = iter->buf_size - iter->buf_used;
1152                 int err;
1153
1154                 stream->avail_out = this_out;
1155                 stream->next_out = iter->buf + iter->buf_used;
1156
1157                 err = inflate(stream, Z_NO_FLUSH);
1158                 if (err < 0) {
1159                         log_err("fio: failed inflating log: %d\n", err);
1160                         iter->err = err;
1161                         break;
1162                 }
1163
1164                 iter->buf_used += this_out - stream->avail_out;
1165
1166                 if (!stream->avail_out) {
1167                         iter->buf_size += iter->chunk_sz;
1168                         iter->buf = realloc(iter->buf, iter->buf_size);
1169                         continue;
1170                 }
1171
1172                 if (err == Z_STREAM_END)
1173                         break;
1174         }
1175
1176         ret = (void *) stream->next_in - ic->buf;
1177
1178         dprint(FD_COMPRESS, "inflated to size=%lu\n", (unsigned long) iter->buf_size);
1179
1180         return ret;
1181 }
1182
1183 /*
1184  * Inflate stored compressed chunks, or write them directly to the log
1185  * file if so instructed.
1186  */
1187 static int inflate_gz_chunks(struct io_log *log, FILE *f)
1188 {
1189         struct inflate_chunk_iter iter = { .chunk_sz = log->log_gz, };
1190         z_stream stream;
1191
1192         while (!flist_empty(&log->chunk_list)) {
1193                 struct iolog_compress *ic;
1194
1195                 ic = flist_first_entry(&log->chunk_list, struct iolog_compress, list);
1196                 flist_del(&ic->list);
1197
1198                 if (log->log_gz_store) {
1199                         size_t ret;
1200
1201                         dprint(FD_COMPRESS, "log write chunk size=%lu, "
1202                                 "seq=%u\n", (unsigned long) ic->len, ic->seq);
1203
1204                         ret = fwrite(ic->buf, ic->len, 1, f);
1205                         if (ret != 1 || ferror(f)) {
1206                                 iter.err = errno;
1207                                 log_err("fio: error writing compressed log\n");
1208                         }
1209                 } else
1210                         inflate_chunk(ic, log->log_gz_store, f, &stream, &iter);
1211
1212                 free_chunk(ic);
1213         }
1214
1215         if (iter.seq) {
1216                 finish_chunk(&stream, f, &iter);
1217                 free(iter.buf);
1218         }
1219
1220         return iter.err;
1221 }
1222
1223 /*
1224  * Open compressed log file and decompress the stored chunks and
1225  * write them to stdout. The chunks are stored sequentially in the
1226  * file, so we iterate over them and do them one-by-one.
1227  */
1228 int iolog_file_inflate(const char *file)
1229 {
1230         struct inflate_chunk_iter iter = { .chunk_sz = 64 * 1024 * 1024, };
1231         struct iolog_compress ic;
1232         z_stream stream;
1233         struct stat sb;
1234         size_t ret;
1235         size_t total;
1236         void *buf;
1237         FILE *f;
1238
1239         f = fopen(file, "rb");
1240         if (!f) {
1241                 perror("fopen");
1242                 return 1;
1243         }
1244
1245         if (stat(file, &sb) < 0) {
1246                 fclose(f);
1247                 perror("stat");
1248                 return 1;
1249         }
1250
1251         ic.buf = buf = malloc(sb.st_size);
1252         ic.len = sb.st_size;
1253         ic.seq = 1;
1254
1255         ret = fread(ic.buf, ic.len, 1, f);
1256         if (ret == 0 && ferror(f)) {
1257                 perror("fread");
1258                 fclose(f);
1259                 free(buf);
1260                 return 1;
1261         } else if (ferror(f) || (!feof(f) && ret != 1)) {
1262                 log_err("fio: short read on reading log\n");
1263                 fclose(f);
1264                 free(buf);
1265                 return 1;
1266         }
1267
1268         fclose(f);
1269
1270         /*
1271          * Each chunk will return Z_STREAM_END. We don't know how many
1272          * chunks are in the file, so we just keep looping and incrementing
1273          * the sequence number until we have consumed the whole compressed
1274          * file.
1275          */
1276         total = ic.len;
1277         do {
1278                 size_t iret;
1279
1280                 iret = inflate_chunk(&ic,  1, stdout, &stream, &iter);
1281                 total -= iret;
1282                 if (!total)
1283                         break;
1284                 if (iter.err)
1285                         break;
1286
1287                 ic.seq++;
1288                 ic.len -= iret;
1289                 ic.buf += iret;
1290         } while (1);
1291
1292         if (iter.seq) {
1293                 finish_chunk(&stream, stdout, &iter);
1294                 free(iter.buf);
1295         }
1296
1297         free(buf);
1298         return iter.err;
1299 }
1300
1301 #else
1302
1303 static int inflate_gz_chunks(struct io_log *log, FILE *f)
1304 {
1305         return 0;
1306 }
1307
1308 int iolog_file_inflate(const char *file)
1309 {
1310         log_err("fio: log inflation not possible without zlib\n");
1311         return 1;
1312 }
1313
1314 #endif
1315
1316 void flush_log(struct io_log *log, bool do_append)
1317 {
1318         void *buf;
1319         FILE *f;
1320
1321         /*
1322          * If log_gz_store is true, we are writing a binary file.
1323          * Set the mode appropriately (on all platforms) to avoid issues
1324          * on windows (line-ending conversions, etc.)
1325          */
1326         if (!do_append)
1327                 if (log->log_gz_store)
1328                         f = fopen(log->filename, "wb");
1329                 else
1330                         f = fopen(log->filename, "w");
1331         else
1332                 if (log->log_gz_store)
1333                         f = fopen(log->filename, "ab");
1334                 else
1335                         f = fopen(log->filename, "a");
1336         if (!f) {
1337                 perror("fopen log");
1338                 return;
1339         }
1340
1341         buf = set_file_buffer(f);
1342
1343         inflate_gz_chunks(log, f);
1344
1345         while (!flist_empty(&log->io_logs)) {
1346                 struct io_logs *cur_log;
1347
1348                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
1349                 flist_del_init(&cur_log->list);
1350
1351                 if (log->td && log == log->td->clat_hist_log)
1352                         flush_hist_samples(f, log->hist_coarseness, cur_log->log,
1353                                            log_sample_sz(log, cur_log));
1354                 else
1355                         flush_samples(f, cur_log->log, log_sample_sz(log, cur_log));
1356
1357                 sfree(cur_log);
1358         }
1359
1360         fclose(f);
1361         clear_file_buffer(buf);
1362 }
1363
1364 static int finish_log(struct thread_data *td, struct io_log *log, int trylock)
1365 {
1366         if (td->flags & TD_F_COMPRESS_LOG)
1367                 iolog_flush(log);
1368
1369         if (trylock) {
1370                 if (fio_trylock_file(log->filename))
1371                         return 1;
1372         } else
1373                 fio_lock_file(log->filename);
1374
1375         if (td->client_type == FIO_CLIENT_TYPE_GUI || is_backend)
1376                 fio_send_iolog(td, log, log->filename);
1377         else
1378                 flush_log(log, !td->o.per_job_logs);
1379
1380         fio_unlock_file(log->filename);
1381         free_log(log);
1382         return 0;
1383 }
1384
1385 size_t log_chunk_sizes(struct io_log *log)
1386 {
1387         struct flist_head *entry;
1388         size_t ret;
1389
1390         if (flist_empty(&log->chunk_list))
1391                 return 0;
1392
1393         ret = 0;
1394         pthread_mutex_lock(&log->chunk_lock);
1395         flist_for_each(entry, &log->chunk_list) {
1396                 struct iolog_compress *c;
1397
1398                 c = flist_entry(entry, struct iolog_compress, list);
1399                 ret += c->len;
1400         }
1401         pthread_mutex_unlock(&log->chunk_lock);
1402         return ret;
1403 }
1404
1405 #ifdef CONFIG_ZLIB
1406
1407 static void iolog_put_deferred(struct io_log *log, void *ptr)
1408 {
1409         if (!ptr)
1410                 return;
1411
1412         pthread_mutex_lock(&log->deferred_free_lock);
1413         if (log->deferred < IOLOG_MAX_DEFER) {
1414                 log->deferred_items[log->deferred] = ptr;
1415                 log->deferred++;
1416         } else if (!fio_did_warn(FIO_WARN_IOLOG_DROP))
1417                 log_err("fio: had to drop log entry free\n");
1418         pthread_mutex_unlock(&log->deferred_free_lock);
1419 }
1420
1421 static void iolog_free_deferred(struct io_log *log)
1422 {
1423         int i;
1424
1425         if (!log->deferred)
1426                 return;
1427
1428         pthread_mutex_lock(&log->deferred_free_lock);
1429
1430         for (i = 0; i < log->deferred; i++) {
1431                 free(log->deferred_items[i]);
1432                 log->deferred_items[i] = NULL;
1433         }
1434
1435         log->deferred = 0;
1436         pthread_mutex_unlock(&log->deferred_free_lock);
1437 }
1438
1439 static int gz_work(struct iolog_flush_data *data)
1440 {
1441         struct iolog_compress *c = NULL;
1442         struct flist_head list;
1443         unsigned int seq;
1444         z_stream stream;
1445         size_t total = 0;
1446         int ret;
1447
1448         INIT_FLIST_HEAD(&list);
1449
1450         memset(&stream, 0, sizeof(stream));
1451         stream.zalloc = Z_NULL;
1452         stream.zfree = Z_NULL;
1453         stream.opaque = Z_NULL;
1454
1455         ret = deflateInit(&stream, Z_DEFAULT_COMPRESSION);
1456         if (ret != Z_OK) {
1457                 log_err("fio: failed to init gz stream\n");
1458                 goto err;
1459         }
1460
1461         seq = ++data->log->chunk_seq;
1462
1463         stream.next_in = (void *) data->samples;
1464         stream.avail_in = data->nr_samples * log_entry_sz(data->log);
1465
1466         dprint(FD_COMPRESS, "deflate input size=%lu, seq=%u, log=%s\n",
1467                                 (unsigned long) stream.avail_in, seq,
1468                                 data->log->filename);
1469         do {
1470                 if (c)
1471                         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq,
1472                                 (unsigned long) c->len);
1473                 c = get_new_chunk(seq);
1474                 stream.avail_out = GZ_CHUNK;
1475                 stream.next_out = c->buf;
1476                 ret = deflate(&stream, Z_NO_FLUSH);
1477                 if (ret < 0) {
1478                         log_err("fio: deflate log (%d)\n", ret);
1479                         free_chunk(c);
1480                         goto err;
1481                 }
1482
1483                 c->len = GZ_CHUNK - stream.avail_out;
1484                 flist_add_tail(&c->list, &list);
1485                 total += c->len;
1486         } while (stream.avail_in);
1487
1488         stream.next_out = c->buf + c->len;
1489         stream.avail_out = GZ_CHUNK - c->len;
1490
1491         ret = deflate(&stream, Z_FINISH);
1492         if (ret < 0) {
1493                 /*
1494                  * Z_BUF_ERROR is special, it just means we need more
1495                  * output space. We'll handle that below. Treat any other
1496                  * error as fatal.
1497                  */
1498                 if (ret != Z_BUF_ERROR) {
1499                         log_err("fio: deflate log (%d)\n", ret);
1500                         flist_del(&c->list);
1501                         free_chunk(c);
1502                         goto err;
1503                 }
1504         }
1505
1506         total -= c->len;
1507         c->len = GZ_CHUNK - stream.avail_out;
1508         total += c->len;
1509         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq, (unsigned long) c->len);
1510
1511         if (ret != Z_STREAM_END) {
1512                 do {
1513                         c = get_new_chunk(seq);
1514                         stream.avail_out = GZ_CHUNK;
1515                         stream.next_out = c->buf;
1516                         ret = deflate(&stream, Z_FINISH);
1517                         c->len = GZ_CHUNK - stream.avail_out;
1518                         total += c->len;
1519                         flist_add_tail(&c->list, &list);
1520                         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq,
1521                                 (unsigned long) c->len);
1522                 } while (ret != Z_STREAM_END);
1523         }
1524
1525         dprint(FD_COMPRESS, "deflated to size=%lu\n", (unsigned long) total);
1526
1527         ret = deflateEnd(&stream);
1528         if (ret != Z_OK)
1529                 log_err("fio: deflateEnd %d\n", ret);
1530
1531         iolog_put_deferred(data->log, data->samples);
1532
1533         if (!flist_empty(&list)) {
1534                 pthread_mutex_lock(&data->log->chunk_lock);
1535                 flist_splice_tail(&list, &data->log->chunk_list);
1536                 pthread_mutex_unlock(&data->log->chunk_lock);
1537         }
1538
1539         ret = 0;
1540 done:
1541         if (data->free)
1542                 sfree(data);
1543         return ret;
1544 err:
1545         while (!flist_empty(&list)) {
1546                 c = flist_first_entry(list.next, struct iolog_compress, list);
1547                 flist_del(&c->list);
1548                 free_chunk(c);
1549         }
1550         ret = 1;
1551         goto done;
1552 }
1553
1554 /*
1555  * Invoked from our compress helper thread, when logging would have exceeded
1556  * the specified memory limitation. Compresses the previously stored
1557  * entries.
1558  */
1559 static int gz_work_async(struct submit_worker *sw, struct workqueue_work *work)
1560 {
1561         return gz_work(container_of(work, struct iolog_flush_data, work));
1562 }
1563
1564 static int gz_init_worker(struct submit_worker *sw)
1565 {
1566         struct thread_data *td = sw->wq->td;
1567
1568         if (!fio_option_is_set(&td->o, log_gz_cpumask))
1569                 return 0;
1570
1571         if (fio_setaffinity(gettid(), td->o.log_gz_cpumask) == -1) {
1572                 log_err("gz: failed to set CPU affinity\n");
1573                 return 1;
1574         }
1575
1576         return 0;
1577 }
1578
1579 static struct workqueue_ops log_compress_wq_ops = {
1580         .fn             = gz_work_async,
1581         .init_worker_fn = gz_init_worker,
1582         .nice           = 1,
1583 };
1584
1585 int iolog_compress_init(struct thread_data *td, struct sk_out *sk_out)
1586 {
1587         if (!(td->flags & TD_F_COMPRESS_LOG))
1588                 return 0;
1589
1590         workqueue_init(td, &td->log_compress_wq, &log_compress_wq_ops, 1, sk_out);
1591         return 0;
1592 }
1593
1594 void iolog_compress_exit(struct thread_data *td)
1595 {
1596         if (!(td->flags & TD_F_COMPRESS_LOG))
1597                 return;
1598
1599         workqueue_exit(&td->log_compress_wq);
1600 }
1601
1602 /*
1603  * Queue work item to compress the existing log entries. We reset the
1604  * current log to a small size, and reference the existing log in the
1605  * data that we queue for compression. Once compression has been done,
1606  * this old log is freed. Will not return until the log compression
1607  * has completed, and will flush all previous logs too
1608  */
1609 static int iolog_flush(struct io_log *log)
1610 {
1611         struct iolog_flush_data *data;
1612
1613         workqueue_flush(&log->td->log_compress_wq);
1614         data = malloc(sizeof(*data));
1615         if (!data)
1616                 return 1;
1617
1618         data->log = log;
1619         data->free = false;
1620
1621         while (!flist_empty(&log->io_logs)) {
1622                 struct io_logs *cur_log;
1623
1624                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
1625                 flist_del_init(&cur_log->list);
1626
1627                 data->samples = cur_log->log;
1628                 data->nr_samples = cur_log->nr_samples;
1629
1630                 sfree(cur_log);
1631
1632                 gz_work(data);
1633         }
1634
1635         free(data);
1636         return 0;
1637 }
1638
1639 int iolog_cur_flush(struct io_log *log, struct io_logs *cur_log)
1640 {
1641         struct iolog_flush_data *data;
1642
1643         data = smalloc(sizeof(*data));
1644         if (!data)
1645                 return 1;
1646
1647         data->log = log;
1648
1649         data->samples = cur_log->log;
1650         data->nr_samples = cur_log->nr_samples;
1651         data->free = true;
1652
1653         cur_log->nr_samples = cur_log->max_samples = 0;
1654         cur_log->log = NULL;
1655
1656         workqueue_enqueue(&log->td->log_compress_wq, &data->work);
1657
1658         iolog_free_deferred(log);
1659
1660         return 0;
1661 }
1662 #else
1663
1664 static int iolog_flush(struct io_log *log)
1665 {
1666         return 1;
1667 }
1668
1669 int iolog_cur_flush(struct io_log *log, struct io_logs *cur_log)
1670 {
1671         return 1;
1672 }
1673
1674 int iolog_compress_init(struct thread_data *td, struct sk_out *sk_out)
1675 {
1676         return 0;
1677 }
1678
1679 void iolog_compress_exit(struct thread_data *td)
1680 {
1681 }
1682
1683 #endif
1684
1685 struct io_logs *iolog_cur_log(struct io_log *log)
1686 {
1687         if (flist_empty(&log->io_logs))
1688                 return NULL;
1689
1690         return flist_last_entry(&log->io_logs, struct io_logs, list);
1691 }
1692
1693 uint64_t iolog_nr_samples(struct io_log *iolog)
1694 {
1695         struct flist_head *entry;
1696         uint64_t ret = 0;
1697
1698         flist_for_each(entry, &iolog->io_logs) {
1699                 struct io_logs *cur_log;
1700
1701                 cur_log = flist_entry(entry, struct io_logs, list);
1702                 ret += cur_log->nr_samples;
1703         }
1704
1705         return ret;
1706 }
1707
1708 static int __write_log(struct thread_data *td, struct io_log *log, int try)
1709 {
1710         if (log)
1711                 return finish_log(td, log, try);
1712
1713         return 0;
1714 }
1715
1716 static int write_iops_log(struct thread_data *td, int try, bool unit_log)
1717 {
1718         int ret;
1719
1720         if (per_unit_log(td->iops_log) != unit_log)
1721                 return 0;
1722
1723         ret = __write_log(td, td->iops_log, try);
1724         if (!ret)
1725                 td->iops_log = NULL;
1726
1727         return ret;
1728 }
1729
1730 static int write_slat_log(struct thread_data *td, int try, bool unit_log)
1731 {
1732         int ret;
1733
1734         if (!unit_log)
1735                 return 0;
1736
1737         ret = __write_log(td, td->slat_log, try);
1738         if (!ret)
1739                 td->slat_log = NULL;
1740
1741         return ret;
1742 }
1743
1744 static int write_clat_log(struct thread_data *td, int try, bool unit_log)
1745 {
1746         int ret;
1747
1748         if (!unit_log)
1749                 return 0;
1750
1751         ret = __write_log(td, td->clat_log, try);
1752         if (!ret)
1753                 td->clat_log = NULL;
1754
1755         return ret;
1756 }
1757
1758 static int write_clat_hist_log(struct thread_data *td, int try, bool unit_log)
1759 {
1760         int ret;
1761
1762         if (!unit_log)
1763                 return 0;
1764
1765         ret = __write_log(td, td->clat_hist_log, try);
1766         if (!ret)
1767                 td->clat_hist_log = NULL;
1768
1769         return ret;
1770 }
1771
1772 static int write_lat_log(struct thread_data *td, int try, bool unit_log)
1773 {
1774         int ret;
1775
1776         if (!unit_log)
1777                 return 0;
1778
1779         ret = __write_log(td, td->lat_log, try);
1780         if (!ret)
1781                 td->lat_log = NULL;
1782
1783         return ret;
1784 }
1785
1786 static int write_bandw_log(struct thread_data *td, int try, bool unit_log)
1787 {
1788         int ret;
1789
1790         if (per_unit_log(td->bw_log) != unit_log)
1791                 return 0;
1792
1793         ret = __write_log(td, td->bw_log, try);
1794         if (!ret)
1795                 td->bw_log = NULL;
1796
1797         return ret;
1798 }
1799
1800 enum {
1801         BW_LOG_MASK     = 1,
1802         LAT_LOG_MASK    = 2,
1803         SLAT_LOG_MASK   = 4,
1804         CLAT_LOG_MASK   = 8,
1805         IOPS_LOG_MASK   = 16,
1806         CLAT_HIST_LOG_MASK = 32,
1807
1808         ALL_LOG_NR      = 6,
1809 };
1810
1811 struct log_type {
1812         unsigned int mask;
1813         int (*fn)(struct thread_data *, int, bool);
1814 };
1815
1816 static struct log_type log_types[] = {
1817         {
1818                 .mask   = BW_LOG_MASK,
1819                 .fn     = write_bandw_log,
1820         },
1821         {
1822                 .mask   = LAT_LOG_MASK,
1823                 .fn     = write_lat_log,
1824         },
1825         {
1826                 .mask   = SLAT_LOG_MASK,
1827                 .fn     = write_slat_log,
1828         },
1829         {
1830                 .mask   = CLAT_LOG_MASK,
1831                 .fn     = write_clat_log,
1832         },
1833         {
1834                 .mask   = IOPS_LOG_MASK,
1835                 .fn     = write_iops_log,
1836         },
1837         {
1838                 .mask   = CLAT_HIST_LOG_MASK,
1839                 .fn     = write_clat_hist_log,
1840         }
1841 };
1842
1843 void td_writeout_logs(struct thread_data *td, bool unit_logs)
1844 {
1845         unsigned int log_mask = 0;
1846         unsigned int log_left = ALL_LOG_NR;
1847         int old_state, i;
1848
1849         old_state = td_bump_runstate(td, TD_FINISHING);
1850
1851         finalize_logs(td, unit_logs);
1852
1853         while (log_left) {
1854                 int prev_log_left = log_left;
1855
1856                 for (i = 0; i < ALL_LOG_NR && log_left; i++) {
1857                         struct log_type *lt = &log_types[i];
1858                         int ret;
1859
1860                         if (!(log_mask & lt->mask)) {
1861                                 ret = lt->fn(td, log_left != 1, unit_logs);
1862                                 if (!ret) {
1863                                         log_left--;
1864                                         log_mask |= lt->mask;
1865                                 }
1866                         }
1867                 }
1868
1869                 if (prev_log_left == log_left)
1870                         usleep(5000);
1871         }
1872
1873         td_restore_runstate(td, old_state);
1874 }
1875
1876 void fio_writeout_logs(bool unit_logs)
1877 {
1878         struct thread_data *td;
1879         int i;
1880
1881         for_each_td(td, i)
1882                 td_writeout_logs(td, unit_logs);
1883 }