verify.c

   1 /*
   2  * IO verification helpers
   3  */
   4 #include <unistd.h>
   5 #include <fcntl.h>
   6 #include <string.h>
   7 #include <assert.h>
   8 #include <pthread.h>
   9 #include <libgen.h>
  10
  11 #include "fio.h"
  12 #include "verify.h"
  13 #include "trim.h"
  14 #include "lib/rand.h"
  15 #include "lib/hweight.h"
  16 #include "lib/pattern.h"
  17
  18 #include "crc/md5.h"
  19 #include "crc/crc64.h"
  20 #include "crc/crc32.h"
  21 #include "crc/crc32c.h"
  22 #include "crc/crc16.h"
  23 #include "crc/crc7.h"
  24 #include "crc/sha256.h"
  25 #include "crc/sha512.h"
  26 #include "crc/sha1.h"
  27 #include "crc/xxhash.h"
  28 #include "crc/sha3.h"
  29
  30 static void populate_hdr(struct thread_data *td, struct io_u *io_u,
  31                          struct verify_header *hdr, unsigned int header_num,
  32                          unsigned int header_len);
  33 static void __fill_hdr(struct thread_data *td, struct io_u *io_u,
  34                        struct verify_header *hdr, unsigned int header_num,
  35                        unsigned int header_len, uint64_t rand_seed);
  36
  37 void fill_buffer_pattern(struct thread_data *td, void *p, unsigned int len)
  38 {
  39         (void)cpy_pattern(td->o.buffer_pattern, td->o.buffer_pattern_bytes, p, len);
  40 }
  41
  42 static void __fill_buffer(struct thread_options *o, unsigned long seed, void *p,
  43                           unsigned int len)
  44 {
  45         __fill_random_buf_percentage(seed, p, o->compress_percentage, len, len, o->buffer_pattern, o->buffer_pattern_bytes);
  46 }
  47
  48 static unsigned long fill_buffer(struct thread_data *td, void *p,
  49                                  unsigned int len)
  50 {
  51         struct frand_state *fs = &td->verify_state;
  52         struct thread_options *o = &td->o;
  53
  54         return fill_random_buf_percentage(fs, p, o->compress_percentage, len, len, o->buffer_pattern, o->buffer_pattern_bytes);
  55 }
  56
  57 void fill_verify_pattern(struct thread_data *td, void *p, unsigned int len,
  58                          struct io_u *io_u, unsigned long seed, int use_seed)
  59 {
  60         struct thread_options *o = &td->o;
  61
  62         if (!o->verify_pattern_bytes) {
  63                 dprint(FD_VERIFY, "fill random bytes len=%u\n", len);
  64
  65                 if (use_seed)
  66                         __fill_buffer(o, seed, p, len);
  67                 else
  68                         io_u->rand_seed = fill_buffer(td, p, len);
  69                 return;
  70         }
  71
  72         /* Skip if we were here and we do not need to patch pattern
  73          * with format */
  74         if (!td->o.verify_fmt_sz && io_u->buf_filled_len >= len) {
  75                 dprint(FD_VERIFY, "using already filled verify pattern b=%d len=%u\n",
  76                         o->verify_pattern_bytes, len);
  77                 return;
  78         }
  79
  80         (void)paste_format(td->o.verify_pattern, td->o.verify_pattern_bytes,
  81                            td->o.verify_fmt, td->o.verify_fmt_sz,
  82                            p, len, io_u);
  83         io_u->buf_filled_len = len;
  84 }
  85
  86 static unsigned int get_hdr_inc(struct thread_data *td, struct io_u *io_u)
  87 {
  88         unsigned int hdr_inc;
  89
  90         /*
  91          * If we use bs_unaligned, buflen can be larger than the verify
  92          * interval (which just defaults to the smallest blocksize possible).
  93          */
  94         hdr_inc = io_u->buflen;
  95         if (td->o.verify_interval && td->o.verify_interval <= io_u->buflen &&
  96             !td->o.bs_unaligned)
  97                 hdr_inc = td->o.verify_interval;
  98
  99         return hdr_inc;
 100 }
 101
 102 static void fill_pattern_headers(struct thread_data *td, struct io_u *io_u,
 103                                  unsigned long seed, int use_seed)
 104 {
 105         unsigned int hdr_inc, header_num;
 106         struct verify_header *hdr;
 107         void *p = io_u->buf;
 108
 109         fill_verify_pattern(td, p, io_u->buflen, io_u, seed, use_seed);
 110
 111         hdr_inc = get_hdr_inc(td, io_u);
 112         header_num = 0;
 113         for (; p < io_u->buf + io_u->buflen; p += hdr_inc) {
 114                 hdr = p;
 115                 populate_hdr(td, io_u, hdr, header_num, hdr_inc);
 116                 header_num++;
 117         }
 118 }
 119
 120 static void memswp(void *buf1, void *buf2, unsigned int len)
 121 {
 122         char swap[200];
 123
 124         assert(len <= sizeof(swap));
 125
 126         memcpy(&swap, buf1, len);
 127         memcpy(buf1, buf2, len);
 128         memcpy(buf2, &swap, len);
 129 }
 130
 131 static void hexdump(void *buffer, int len)
 132 {
 133         unsigned char *p = buffer;
 134         int i;
 135
 136         for (i = 0; i < len; i++)
 137                 log_err("%02x", p[i]);
 138         log_err("\n");
 139 }
 140
 141 /*
 142  * Prepare for separation of verify_header and checksum header
 143  */
 144 static inline unsigned int __hdr_size(int verify_type)
 145 {
 146         unsigned int len = 0;
 147
 148         switch (verify_type) {
 149         case VERIFY_NONE:
 150         case VERIFY_HDR_ONLY:
 151         case VERIFY_NULL:
 152         case VERIFY_PATTERN:
 153                 len = 0;
 154                 break;
 155         case VERIFY_MD5:
 156                 len = sizeof(struct vhdr_md5);
 157                 break;
 158         case VERIFY_CRC64:
 159                 len = sizeof(struct vhdr_crc64);
 160                 break;
 161         case VERIFY_CRC32C:
 162         case VERIFY_CRC32:
 163         case VERIFY_CRC32C_INTEL:
 164                 len = sizeof(struct vhdr_crc32);
 165                 break;
 166         case VERIFY_CRC16:
 167                 len = sizeof(struct vhdr_crc16);
 168                 break;
 169         case VERIFY_CRC7:
 170                 len = sizeof(struct vhdr_crc7);
 171                 break;
 172         case VERIFY_SHA256:
 173                 len = sizeof(struct vhdr_sha256);
 174                 break;
 175         case VERIFY_SHA512:
 176                 len = sizeof(struct vhdr_sha512);
 177                 break;
 178         case VERIFY_SHA3_224:
 179                 len = sizeof(struct vhdr_sha3_224);
 180                 break;
 181         case VERIFY_SHA3_256:
 182                 len = sizeof(struct vhdr_sha3_256);
 183                 break;
 184         case VERIFY_SHA3_384:
 185                 len = sizeof(struct vhdr_sha3_384);
 186                 break;
 187         case VERIFY_SHA3_512:
 188                 len = sizeof(struct vhdr_sha3_512);
 189                 break;
 190         case VERIFY_XXHASH:
 191                 len = sizeof(struct vhdr_xxhash);
 192                 break;
 193         case VERIFY_SHA1:
 194                 len = sizeof(struct vhdr_sha1);
 195                 break;
 196         case VERIFY_PATTERN_NO_HDR:
 197                 return 0;
 198         default:
 199                 log_err("fio: unknown verify header!\n");
 200                 assert(0);
 201         }
 202
 203         return len + sizeof(struct verify_header);
 204 }
 205
 206 static inline unsigned int hdr_size(struct thread_data *td,
 207                                     struct verify_header *hdr)
 208 {
 209         if (td->o.verify == VERIFY_PATTERN_NO_HDR)
 210                 return 0;
 211
 212         return __hdr_size(hdr->verify_type);
 213 }
 214
 215 static void *hdr_priv(struct verify_header *hdr)
 216 {
 217         void *priv = hdr;
 218
 219         return priv + sizeof(struct verify_header);
 220 }
 221
 222 /*
 223  * Verify container, pass info to verify handlers and allow them to
 224  * pass info back in case of error
 225  */
 226 struct vcont {
 227         /*
 228          * Input
 229          */
 230         struct io_u *io_u;
 231         unsigned int hdr_num;
 232         struct thread_data *td;
 233
 234         /*
 235          * Output, only valid in case of error
 236          */
 237         const char *name;
 238         void *good_crc;
 239         void *bad_crc;
 240         unsigned int crc_len;
 241 };
 242
 243 #define DUMP_BUF_SZ     255
 244 static int dump_buf_warned;
 245
 246 static void dump_buf(char *buf, unsigned int len, unsigned long long offset,
 247                      const char *type, struct fio_file *f)
 248 {
 249         char *ptr, fname[DUMP_BUF_SZ];
 250         size_t buf_left = DUMP_BUF_SZ;
 251         int ret, fd;
 252
 253         ptr = strdup(f->file_name);
 254
 255         memset(fname, 0, sizeof(fname));
 256         if (aux_path)
 257                 sprintf(fname, "%s%c", aux_path, FIO_OS_PATH_SEPARATOR);
 258
 259         strncpy(fname + strlen(fname), basename(ptr), buf_left - 1);
 260
 261         buf_left -= strlen(fname);
 262         if (buf_left <= 0) {
 263                 if (!dump_buf_warned) {
 264                         log_err("fio: verify failure dump buffer too small\n");
 265                         dump_buf_warned = 1;
 266                 }
 267                 free(ptr);
 268                 return;
 269         }
 270
 271         snprintf(fname + strlen(fname), buf_left, ".%llu.%s", offset, type);
 272
 273         fd = open(fname, O_CREAT | O_TRUNC | O_WRONLY, 0644);
 274         if (fd < 0) {
 275                 perror("open verify buf file");
 276                 free(ptr);
 277                 return;
 278         }
 279
 280         while (len) {
 281                 ret = write(fd, buf, len);
 282                 if (!ret)
 283                         break;
 284                 else if (ret < 0) {
 285                         perror("write verify buf file");
 286                         break;
 287                 }
 288                 len -= ret;
 289                 buf += ret;
 290         }
 291
 292         close(fd);
 293         log_err("       %s data dumped as %s\n", type, fname);
 294         free(ptr);
 295 }
 296
 297 /*
 298  * Dump the contents of the read block and re-generate the correct data
 299  * and dump that too.
 300  */
 301 static void __dump_verify_buffers(struct verify_header *hdr, struct vcont *vc)
 302 {
 303         struct thread_data *td = vc->td;
 304         struct io_u *io_u = vc->io_u;
 305         unsigned long hdr_offset;
 306         struct io_u dummy;
 307         void *buf;
 308
 309         if (!td->o.verify_dump)
 310                 return;
 311
 312         /*
 313          * Dump the contents we just read off disk
 314          */
 315         hdr_offset = vc->hdr_num * hdr->len;
 316
 317         dump_buf(io_u->buf + hdr_offset, hdr->len, io_u->offset + hdr_offset,
 318                         "received", vc->io_u->file);
 319
 320         /*
 321          * Allocate a new buf and re-generate the original data
 322          */
 323         buf = malloc(io_u->buflen);
 324         dummy = *io_u;
 325         dummy.buf = buf;
 326         dummy.rand_seed = hdr->rand_seed;
 327         dummy.buf_filled_len = 0;
 328         dummy.buflen = io_u->buflen;
 329
 330         fill_pattern_headers(td, &dummy, hdr->rand_seed, 1);
 331
 332         dump_buf(buf + hdr_offset, hdr->len, io_u->offset + hdr_offset,
 333                         "expected", vc->io_u->file);
 334         free(buf);
 335 }
 336
 337 static void dump_verify_buffers(struct verify_header *hdr, struct vcont *vc)
 338 {
 339         struct thread_data *td = vc->td;
 340         struct verify_header shdr;
 341
 342         if (td->o.verify == VERIFY_PATTERN_NO_HDR) {
 343                 __fill_hdr(td, vc->io_u, &shdr, 0, vc->io_u->buflen, 0);
 344                 hdr = &shdr;
 345         }
 346
 347         __dump_verify_buffers(hdr, vc);
 348 }
 349
 350 static void log_verify_failure(struct verify_header *hdr, struct vcont *vc)
 351 {
 352         unsigned long long offset;
 353
 354         offset = vc->io_u->offset;
 355         offset += vc->hdr_num * hdr->len;
 356         log_err("%.8s: verify failed at file %s offset %llu, length %u\n",
 357                         vc->name, vc->io_u->file->file_name, offset, hdr->len);
 358
 359         if (vc->good_crc && vc->bad_crc) {
 360                 log_err("       Expected CRC: ");
 361                 hexdump(vc->good_crc, vc->crc_len);
 362                 log_err("       Received CRC: ");
 363                 hexdump(vc->bad_crc, vc->crc_len);
 364         }
 365
 366         dump_verify_buffers(hdr, vc);
 367 }
 368
 369 /*
 370  * Return data area 'header_num'
 371  */
 372 static inline void *io_u_verify_off(struct verify_header *hdr, struct vcont *vc)
 373 {
 374         return vc->io_u->buf + vc->hdr_num * hdr->len + hdr_size(vc->td, hdr);
 375 }
 376
 377 static int verify_io_u_pattern(struct verify_header *hdr, struct vcont *vc)
 378 {
 379         struct thread_data *td = vc->td;
 380         struct io_u *io_u = vc->io_u;
 381         char *buf, *pattern;
 382         unsigned int header_size = __hdr_size(td->o.verify);
 383         unsigned int len, mod, i, pattern_size;
 384         int rc;
 385
 386         pattern = td->o.verify_pattern;
 387         pattern_size = td->o.verify_pattern_bytes;
 388         assert(pattern_size != 0);
 389
 390         (void)paste_format_inplace(pattern, pattern_size,
 391                                    td->o.verify_fmt, td->o.verify_fmt_sz, io_u);
 392
 393         buf = (char *) hdr + header_size;
 394         len = get_hdr_inc(td, io_u) - header_size;
 395         mod = (get_hdr_inc(td, io_u) * vc->hdr_num + header_size) % pattern_size;
 396
 397         rc = cmp_pattern(pattern, pattern_size, mod, buf, len);
 398         if (!rc)
 399                 return 0;
 400
 401         /* Slow path, compare each byte */
 402         for (i = 0; i < len; i++) {
 403                 if (buf[i] != pattern[mod]) {
 404                         unsigned int bits;
 405
 406                         bits = hweight8(buf[i] ^ pattern[mod]);
 407                         log_err("fio: got pattern '%02x', wanted '%02x'. Bad bits %d\n",
 408                                 (unsigned char)buf[i],
 409                                 (unsigned char)pattern[mod],
 410                                 bits);
 411                         log_err("fio: bad pattern block offset %u\n", i);
 412                         vc->name = "pattern";
 413                         log_verify_failure(hdr, vc);
 414                         return EILSEQ;
 415                 }
 416                 mod++;
 417                 if (mod == td->o.verify_pattern_bytes)
 418                         mod = 0;
 419         }
 420
 421         /* Unreachable line */
 422         assert(0);
 423         return EILSEQ;
 424 }
 425
 426 static int verify_io_u_xxhash(struct verify_header *hdr, struct vcont *vc)
 427 {
 428         void *p = io_u_verify_off(hdr, vc);
 429         struct vhdr_xxhash *vh = hdr_priv(hdr);
 430         uint32_t hash;
 431         void *state;
 432
 433         dprint(FD_VERIFY, "xxhash verify io_u %p, len %u\n", vc->io_u, hdr->len);
 434
 435         state = XXH32_init(1);
 436         XXH32_update(state, p, hdr->len - hdr_size(vc->td, hdr));
 437         hash = XXH32_digest(state);
 438
 439         if (vh->hash == hash)
 440                 return 0;
 441
 442         vc->name = "xxhash";
 443         vc->good_crc = &vh->hash;
 444         vc->bad_crc = &hash;
 445         vc->crc_len = sizeof(hash);
 446         log_verify_failure(hdr, vc);
 447         return EILSEQ;
 448 }
 449
 450 static int verify_io_u_sha3(struct verify_header *hdr, struct vcont *vc,
 451                             struct fio_sha3_ctx *sha3_ctx, uint8_t *sha,
 452                             unsigned int sha_size, const char *name)
 453 {
 454         void *p = io_u_verify_off(hdr, vc);
 455
 456         dprint(FD_VERIFY, "%s verify io_u %p, len %u\n", name, vc->io_u, hdr->len);
 457
 458         fio_sha3_update(sha3_ctx, p, hdr->len - hdr_size(vc->td, hdr));
 459         fio_sha3_final(sha3_ctx);
 460
 461         if (!memcmp(sha, sha3_ctx->sha, sha_size))
 462                 return 0;
 463
 464         vc->name = name;
 465         vc->good_crc = sha;
 466         vc->bad_crc = sha3_ctx->sha;
 467         vc->crc_len = sha_size;
 468         log_verify_failure(hdr, vc);
 469         return EILSEQ;
 470 }
 471
 472 static int verify_io_u_sha3_224(struct verify_header *hdr, struct vcont *vc)
 473 {
 474         struct vhdr_sha3_224 *vh = hdr_priv(hdr);
 475         uint8_t sha[SHA3_224_DIGEST_SIZE];
 476         struct fio_sha3_ctx sha3_ctx = {
 477                 .sha = sha,
 478         };
 479
 480         fio_sha3_224_init(&sha3_ctx);
 481
 482         return verify_io_u_sha3(hdr, vc, &sha3_ctx, vh->sha,
 483                                 SHA3_224_DIGEST_SIZE, "sha3-224");
 484 }
 485
 486 static int verify_io_u_sha3_256(struct verify_header *hdr, struct vcont *vc)
 487 {
 488         struct vhdr_sha3_256 *vh = hdr_priv(hdr);
 489         uint8_t sha[SHA3_256_DIGEST_SIZE];
 490         struct fio_sha3_ctx sha3_ctx = {
 491                 .sha = sha,
 492         };
 493
 494         fio_sha3_256_init(&sha3_ctx);
 495
 496         return verify_io_u_sha3(hdr, vc, &sha3_ctx, vh->sha,
 497                                 SHA3_256_DIGEST_SIZE, "sha3-256");
 498 }
 499
 500 static int verify_io_u_sha3_384(struct verify_header *hdr, struct vcont *vc)
 501 {
 502         struct vhdr_sha3_384 *vh = hdr_priv(hdr);
 503         uint8_t sha[SHA3_384_DIGEST_SIZE];
 504         struct fio_sha3_ctx sha3_ctx = {
 505                 .sha = sha,
 506         };
 507
 508         fio_sha3_384_init(&sha3_ctx);
 509
 510         return verify_io_u_sha3(hdr, vc, &sha3_ctx, vh->sha,
 511                                 SHA3_384_DIGEST_SIZE, "sha3-384");
 512 }
 513
 514 static int verify_io_u_sha3_512(struct verify_header *hdr, struct vcont *vc)
 515 {
 516         struct vhdr_sha3_512 *vh = hdr_priv(hdr);
 517         uint8_t sha[SHA3_512_DIGEST_SIZE];
 518         struct fio_sha3_ctx sha3_ctx = {
 519                 .sha = sha,
 520         };
 521
 522         fio_sha3_512_init(&sha3_ctx);
 523
 524         return verify_io_u_sha3(hdr, vc, &sha3_ctx, vh->sha,
 525                                 SHA3_512_DIGEST_SIZE, "sha3-512");
 526 }
 527
 528 static int verify_io_u_sha512(struct verify_header *hdr, struct vcont *vc)
 529 {
 530         void *p = io_u_verify_off(hdr, vc);
 531         struct vhdr_sha512 *vh = hdr_priv(hdr);
 532         uint8_t sha512[128];
 533         struct fio_sha512_ctx sha512_ctx = {
 534                 .buf = sha512,
 535         };
 536
 537         dprint(FD_VERIFY, "sha512 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 538
 539         fio_sha512_init(&sha512_ctx);
 540         fio_sha512_update(&sha512_ctx, p, hdr->len - hdr_size(vc->td, hdr));
 541
 542         if (!memcmp(vh->sha512, sha512_ctx.buf, sizeof(sha512)))
 543                 return 0;
 544
 545         vc->name = "sha512";
 546         vc->good_crc = vh->sha512;
 547         vc->bad_crc = sha512_ctx.buf;
 548         vc->crc_len = sizeof(vh->sha512);
 549         log_verify_failure(hdr, vc);
 550         return EILSEQ;
 551 }
 552
 553 static int verify_io_u_sha256(struct verify_header *hdr, struct vcont *vc)
 554 {
 555         void *p = io_u_verify_off(hdr, vc);
 556         struct vhdr_sha256 *vh = hdr_priv(hdr);
 557         uint8_t sha256[64];
 558         struct fio_sha256_ctx sha256_ctx = {
 559                 .buf = sha256,
 560         };
 561
 562         dprint(FD_VERIFY, "sha256 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 563
 564         fio_sha256_init(&sha256_ctx);
 565         fio_sha256_update(&sha256_ctx, p, hdr->len - hdr_size(vc->td, hdr));
 566         fio_sha256_final(&sha256_ctx);
 567
 568         if (!memcmp(vh->sha256, sha256_ctx.buf, sizeof(sha256)))
 569                 return 0;
 570
 571         vc->name = "sha256";
 572         vc->good_crc = vh->sha256;
 573         vc->bad_crc = sha256_ctx.buf;
 574         vc->crc_len = sizeof(vh->sha256);
 575         log_verify_failure(hdr, vc);
 576         return EILSEQ;
 577 }
 578
 579 static int verify_io_u_sha1(struct verify_header *hdr, struct vcont *vc)
 580 {
 581         void *p = io_u_verify_off(hdr, vc);
 582         struct vhdr_sha1 *vh = hdr_priv(hdr);
 583         uint32_t sha1[5];
 584         struct fio_sha1_ctx sha1_ctx = {
 585                 .H = sha1,
 586         };
 587
 588         dprint(FD_VERIFY, "sha1 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 589
 590         fio_sha1_init(&sha1_ctx);
 591         fio_sha1_update(&sha1_ctx, p, hdr->len - hdr_size(vc->td, hdr));
 592         fio_sha1_final(&sha1_ctx);
 593
 594         if (!memcmp(vh->sha1, sha1_ctx.H, sizeof(sha1)))
 595                 return 0;
 596
 597         vc->name = "sha1";
 598         vc->good_crc = vh->sha1;
 599         vc->bad_crc = sha1_ctx.H;
 600         vc->crc_len = sizeof(vh->sha1);
 601         log_verify_failure(hdr, vc);
 602         return EILSEQ;
 603 }
 604
 605 static int verify_io_u_crc7(struct verify_header *hdr, struct vcont *vc)
 606 {
 607         void *p = io_u_verify_off(hdr, vc);
 608         struct vhdr_crc7 *vh = hdr_priv(hdr);
 609         unsigned char c;
 610
 611         dprint(FD_VERIFY, "crc7 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 612
 613         c = fio_crc7(p, hdr->len - hdr_size(vc->td, hdr));
 614
 615         if (c == vh->crc7)
 616                 return 0;
 617
 618         vc->name = "crc7";
 619         vc->good_crc = &vh->crc7;
 620         vc->bad_crc = &c;
 621         vc->crc_len = 1;
 622         log_verify_failure(hdr, vc);
 623         return EILSEQ;
 624 }
 625
 626 static int verify_io_u_crc16(struct verify_header *hdr, struct vcont *vc)
 627 {
 628         void *p = io_u_verify_off(hdr, vc);
 629         struct vhdr_crc16 *vh = hdr_priv(hdr);
 630         unsigned short c;
 631
 632         dprint(FD_VERIFY, "crc16 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 633
 634         c = fio_crc16(p, hdr->len - hdr_size(vc->td, hdr));
 635
 636         if (c == vh->crc16)
 637                 return 0;
 638
 639         vc->name = "crc16";
 640         vc->good_crc = &vh->crc16;
 641         vc->bad_crc = &c;
 642         vc->crc_len = 2;
 643         log_verify_failure(hdr, vc);
 644         return EILSEQ;
 645 }
 646
 647 static int verify_io_u_crc64(struct verify_header *hdr, struct vcont *vc)
 648 {
 649         void *p = io_u_verify_off(hdr, vc);
 650         struct vhdr_crc64 *vh = hdr_priv(hdr);
 651         unsigned long long c;
 652
 653         dprint(FD_VERIFY, "crc64 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 654
 655         c = fio_crc64(p, hdr->len - hdr_size(vc->td, hdr));
 656
 657         if (c == vh->crc64)
 658                 return 0;
 659
 660         vc->name = "crc64";
 661         vc->good_crc = &vh->crc64;
 662         vc->bad_crc = &c;
 663         vc->crc_len = 8;
 664         log_verify_failure(hdr, vc);
 665         return EILSEQ;
 666 }
 667
 668 static int verify_io_u_crc32(struct verify_header *hdr, struct vcont *vc)
 669 {
 670         void *p = io_u_verify_off(hdr, vc);
 671         struct vhdr_crc32 *vh = hdr_priv(hdr);
 672         uint32_t c;
 673
 674         dprint(FD_VERIFY, "crc32 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 675
 676         c = fio_crc32(p, hdr->len - hdr_size(vc->td, hdr));
 677
 678         if (c == vh->crc32)
 679                 return 0;
 680
 681         vc->name = "crc32";
 682         vc->good_crc = &vh->crc32;
 683         vc->bad_crc = &c;
 684         vc->crc_len = 4;
 685         log_verify_failure(hdr, vc);
 686         return EILSEQ;
 687 }
 688
 689 static int verify_io_u_crc32c(struct verify_header *hdr, struct vcont *vc)
 690 {
 691         void *p = io_u_verify_off(hdr, vc);
 692         struct vhdr_crc32 *vh = hdr_priv(hdr);
 693         uint32_t c;
 694
 695         dprint(FD_VERIFY, "crc32c verify io_u %p, len %u\n", vc->io_u, hdr->len);
 696
 697         c = fio_crc32c(p, hdr->len - hdr_size(vc->td, hdr));
 698
 699         if (c == vh->crc32)
 700                 return 0;
 701
 702         vc->name = "crc32c";
 703         vc->good_crc = &vh->crc32;
 704         vc->bad_crc = &c;
 705         vc->crc_len = 4;
 706         log_verify_failure(hdr, vc);
 707         return EILSEQ;
 708 }
 709
 710 static int verify_io_u_md5(struct verify_header *hdr, struct vcont *vc)
 711 {
 712         void *p = io_u_verify_off(hdr, vc);
 713         struct vhdr_md5 *vh = hdr_priv(hdr);
 714         uint32_t hash[MD5_HASH_WORDS];
 715         struct fio_md5_ctx md5_ctx = {
 716                 .hash = hash,
 717         };
 718
 719         dprint(FD_VERIFY, "md5 verify io_u %p, len %u\n", vc->io_u, hdr->len);
 720
 721         fio_md5_init(&md5_ctx);
 722         fio_md5_update(&md5_ctx, p, hdr->len - hdr_size(vc->td, hdr));
 723         fio_md5_final(&md5_ctx);
 724
 725         if (!memcmp(vh->md5_digest, md5_ctx.hash, sizeof(hash)))
 726                 return 0;
 727
 728         vc->name = "md5";
 729         vc->good_crc = vh->md5_digest;
 730         vc->bad_crc = md5_ctx.hash;
 731         vc->crc_len = sizeof(hash);
 732         log_verify_failure(hdr, vc);
 733         return EILSEQ;
 734 }
 735
 736 /*
 737  * Push IO verification to a separate thread
 738  */
 739 int verify_io_u_async(struct thread_data *td, struct io_u **io_u_ptr)
 740 {
 741         struct io_u *io_u = *io_u_ptr;
 742
 743         pthread_mutex_lock(&td->io_u_lock);
 744
 745         if (io_u->file)
 746                 put_file_log(td, io_u->file);
 747
 748         if (io_u->flags & IO_U_F_IN_CUR_DEPTH) {
 749                 td->cur_depth--;
 750                 io_u_clear(td, io_u, IO_U_F_IN_CUR_DEPTH);
 751         }
 752         flist_add_tail(&io_u->verify_list, &td->verify_list);
 753         *io_u_ptr = NULL;
 754         pthread_mutex_unlock(&td->io_u_lock);
 755
 756         pthread_cond_signal(&td->verify_cond);
 757         return 0;
 758 }
 759
 760 /*
 761  * Thanks Rusty, for spending the time so I don't have to.
 762  *
 763  * http://rusty.ozlabs.org/?p=560
 764  */
 765 static int mem_is_zero(const void *data, size_t length)
 766 {
 767         const unsigned char *p = data;
 768         size_t len;
 769
 770         /* Check first 16 bytes manually */
 771         for (len = 0; len < 16; len++) {
 772                 if (!length)
 773                         return 1;
 774                 if (*p)
 775                         return 0;
 776                 p++;
 777                 length--;
 778         }
 779
 780         /* Now we know that's zero, memcmp with self. */
 781         return memcmp(data, p, length) == 0;
 782 }
 783
 784 static int mem_is_zero_slow(const void *data, size_t length, size_t *offset)
 785 {
 786         const unsigned char *p = data;
 787
 788         *offset = 0;
 789         while (length) {
 790                 if (*p)
 791                         break;
 792                 (*offset)++;
 793                 length--;
 794                 p++;
 795         }
 796
 797         return !length;
 798 }
 799
 800 static int verify_trimmed_io_u(struct thread_data *td, struct io_u *io_u)
 801 {
 802         size_t offset;
 803
 804         if (!td->o.trim_zero)
 805                 return 0;
 806
 807         if (mem_is_zero(io_u->buf, io_u->buflen))
 808                 return 0;
 809
 810         mem_is_zero_slow(io_u->buf, io_u->buflen, &offset);
 811
 812         log_err("trim: verify failed at file %s offset %llu, length %lu"
 813                 ", block offset %lu\n",
 814                         io_u->file->file_name, io_u->offset, io_u->buflen,
 815                         (unsigned long) offset);
 816         return EILSEQ;
 817 }
 818
 819 static int verify_header(struct io_u *io_u, struct thread_data *td,
 820                          struct verify_header *hdr, unsigned int hdr_num,
 821                          unsigned int hdr_len)
 822 {
 823         void *p = hdr;
 824         uint32_t crc;
 825
 826         if (hdr->magic != FIO_HDR_MAGIC) {
 827                 log_err("verify: bad magic header %x, wanted %x",
 828                         hdr->magic, FIO_HDR_MAGIC);
 829                 goto err;
 830         }
 831         if (hdr->len != hdr_len) {
 832                 log_err("verify: bad header length %u, wanted %u",
 833                         hdr->len, hdr_len);
 834                 goto err;
 835         }
 836         if (hdr->rand_seed != io_u->rand_seed) {
 837                 log_err("verify: bad header rand_seed %"PRIu64
 838                         ", wanted %"PRIu64,
 839                         hdr->rand_seed, io_u->rand_seed);
 840                 goto err;
 841         }
 842         if (hdr->offset != io_u->offset + hdr_num * td->o.verify_interval) {
 843                 log_err("verify: bad header offset %"PRIu64
 844                         ", wanted %llu",
 845                         hdr->offset, io_u->offset);
 846                 goto err;
 847         }
 848
 849         /*
 850          * For read-only workloads, the program cannot be certain of the
 851          * last numberio written to a block. Checking of numberio will be
 852          * done only for workloads that write data.  For verify_only,
 853          * numberio will be checked in the last iteration when the correct
 854          * state of numberio, that would have been written to each block
 855          * in a previous run of fio, has been reached.
 856          */
 857         if (td_write(td) && (td_min_bs(td) == td_max_bs(td)) &&
 858             !td->o.time_based)
 859                 if (!td->o.verify_only || td->o.loops == 0)
 860                         if (hdr->numberio != io_u->numberio) {
 861                                 log_err("verify: bad header numberio %"PRIu16
 862                                         ", wanted %"PRIu16,
 863                                         hdr->numberio, io_u->numberio);
 864                                 goto err;
 865                         }
 866
 867         crc = fio_crc32c(p, offsetof(struct verify_header, crc32));
 868         if (crc != hdr->crc32) {
 869                 log_err("verify: bad header crc %x, calculated %x",
 870                         hdr->crc32, crc);
 871                 goto err;
 872         }
 873         return 0;
 874
 875 err:
 876         log_err(" at file %s offset %llu, length %u\n",
 877                 io_u->file->file_name,
 878                 io_u->offset + hdr_num * hdr_len, hdr_len);
 879
 880         if (td->o.verify_dump)
 881                 dump_buf(p, hdr_len, io_u->offset + hdr_num * hdr_len,
 882                                 "hdr_fail", io_u->file);
 883
 884         return EILSEQ;
 885 }
 886
 887 int verify_io_u(struct thread_data *td, struct io_u **io_u_ptr)
 888 {
 889         struct verify_header *hdr;
 890         struct io_u *io_u = *io_u_ptr;
 891         unsigned int header_size, hdr_inc, hdr_num = 0;
 892         void *p;
 893         int ret;
 894
 895         if (td->o.verify == VERIFY_NULL || io_u->ddir != DDIR_READ)
 896                 return 0;
 897         /*
 898          * If the IO engine is faking IO (like null), then just pretend
 899          * we verified everything.
 900          */
 901         if (td_ioengine_flagged(td, FIO_FAKEIO))
 902                 return 0;
 903
 904         if (io_u->flags & IO_U_F_TRIMMED) {
 905                 ret = verify_trimmed_io_u(td, io_u);
 906                 goto done;
 907         }
 908
 909         hdr_inc = get_hdr_inc(td, io_u);
 910
 911         ret = 0;
 912         for (p = io_u->buf; p < io_u->buf + io_u->buflen;
 913              p += hdr_inc, hdr_num++) {
 914                 struct vcont vc = {
 915                         .io_u           = io_u,
 916                         .hdr_num        = hdr_num,
 917                         .td             = td,
 918                 };
 919                 unsigned int verify_type;
 920
 921                 if (ret && td->o.verify_fatal)
 922                         break;
 923
 924                 header_size = __hdr_size(td->o.verify);
 925                 if (td->o.verify_offset)
 926                         memswp(p, p + td->o.verify_offset, header_size);
 927                 hdr = p;
 928
 929                 /*
 930                  * Make rand_seed check pass when have verifysort or
 931                  * verify_backlog.
 932                  */
 933                 if (td->o.verifysort || (td->flags & TD_F_VER_BACKLOG))
 934                         io_u->rand_seed = hdr->rand_seed;
 935
 936                 if (td->o.verify != VERIFY_PATTERN_NO_HDR) {
 937                         ret = verify_header(io_u, td, hdr, hdr_num, hdr_inc);
 938                         if (ret)
 939                                 return ret;
 940                 }
 941
 942                 if (td->o.verify != VERIFY_NONE)
 943                         verify_type = td->o.verify;
 944                 else
 945                         verify_type = hdr->verify_type;
 946
 947                 switch (verify_type) {
 948                 case VERIFY_HDR_ONLY:
 949                         /* Header is always verified, check if pattern is left
 950                          * for verification. */
 951                         if (td->o.verify_pattern_bytes)
 952                                 ret = verify_io_u_pattern(hdr, &vc);
 953                         break;
 954                 case VERIFY_MD5:
 955                         ret = verify_io_u_md5(hdr, &vc);
 956                         break;
 957                 case VERIFY_CRC64:
 958                         ret = verify_io_u_crc64(hdr, &vc);
 959                         break;
 960                 case VERIFY_CRC32C:
 961                 case VERIFY_CRC32C_INTEL:
 962                         ret = verify_io_u_crc32c(hdr, &vc);
 963                         break;
 964                 case VERIFY_CRC32:
 965                         ret = verify_io_u_crc32(hdr, &vc);
 966                         break;
 967                 case VERIFY_CRC16:
 968                         ret = verify_io_u_crc16(hdr, &vc);
 969                         break;
 970                 case VERIFY_CRC7:
 971                         ret = verify_io_u_crc7(hdr, &vc);
 972                         break;
 973                 case VERIFY_SHA256:
 974                         ret = verify_io_u_sha256(hdr, &vc);
 975                         break;
 976                 case VERIFY_SHA512:
 977                         ret = verify_io_u_sha512(hdr, &vc);
 978                         break;
 979                 case VERIFY_SHA3_224:
 980                         ret = verify_io_u_sha3_224(hdr, &vc);
 981                         break;
 982                 case VERIFY_SHA3_256:
 983                         ret = verify_io_u_sha3_256(hdr, &vc);
 984                         break;
 985                 case VERIFY_SHA3_384:
 986                         ret = verify_io_u_sha3_384(hdr, &vc);
 987                         break;
 988                 case VERIFY_SHA3_512:
 989                         ret = verify_io_u_sha3_512(hdr, &vc);
 990                         break;
 991                 case VERIFY_XXHASH:
 992                         ret = verify_io_u_xxhash(hdr, &vc);
 993                         break;
 994                 case VERIFY_SHA1:
 995                         ret = verify_io_u_sha1(hdr, &vc);
 996                         break;
 997                 case VERIFY_PATTERN:
 998                 case VERIFY_PATTERN_NO_HDR:
 999                         ret = verify_io_u_pattern(hdr, &vc);
1000                         break;
1001                 default:
1002                         log_err("Bad verify type %u\n", hdr->verify_type);
1003                         ret = EINVAL;
1004                 }
1005
1006                 if (ret && verify_type != hdr->verify_type)
1007                         log_err("fio: verify type mismatch (%u media, %u given)\n",
1008                                         hdr->verify_type, verify_type);
1009         }
1010
1011 done:
1012         if (ret && td->o.verify_fatal)
1013                 fio_mark_td_terminate(td);
1014
1015         return ret;
1016 }
1017
1018 static void fill_xxhash(struct verify_header *hdr, void *p, unsigned int len)
1019 {
1020         struct vhdr_xxhash *vh = hdr_priv(hdr);
1021         void *state;
1022
1023         state = XXH32_init(1);
1024         XXH32_update(state, p, len);
1025         vh->hash = XXH32_digest(state);
1026 }
1027
1028 static void fill_sha3(struct fio_sha3_ctx *sha3_ctx, void *p, unsigned int len)
1029 {
1030         fio_sha3_update(sha3_ctx, p, len);
1031         fio_sha3_final(sha3_ctx);
1032 }
1033
1034 static void fill_sha3_224(struct verify_header *hdr, void *p, unsigned int len)
1035 {
1036         struct vhdr_sha3_224 *vh = hdr_priv(hdr);
1037         struct fio_sha3_ctx sha3_ctx = {
1038                 .sha = vh->sha,
1039         };
1040
1041         fio_sha3_224_init(&sha3_ctx);
1042         fill_sha3(&sha3_ctx, p, len);
1043 }
1044
1045 static void fill_sha3_256(struct verify_header *hdr, void *p, unsigned int len)
1046 {
1047         struct vhdr_sha3_256 *vh = hdr_priv(hdr);
1048         struct fio_sha3_ctx sha3_ctx = {
1049                 .sha = vh->sha,
1050         };
1051
1052         fio_sha3_256_init(&sha3_ctx);
1053         fill_sha3(&sha3_ctx, p, len);
1054 }
1055
1056 static void fill_sha3_384(struct verify_header *hdr, void *p, unsigned int len)
1057 {
1058         struct vhdr_sha3_384 *vh = hdr_priv(hdr);
1059         struct fio_sha3_ctx sha3_ctx = {
1060                 .sha = vh->sha,
1061         };
1062
1063         fio_sha3_384_init(&sha3_ctx);
1064         fill_sha3(&sha3_ctx, p, len);
1065 }
1066
1067 static void fill_sha3_512(struct verify_header *hdr, void *p, unsigned int len)
1068 {
1069         struct vhdr_sha3_512 *vh = hdr_priv(hdr);
1070         struct fio_sha3_ctx sha3_ctx = {
1071                 .sha = vh->sha,
1072         };
1073
1074         fio_sha3_512_init(&sha3_ctx);
1075         fill_sha3(&sha3_ctx, p, len);
1076 }
1077
1078 static void fill_sha512(struct verify_header *hdr, void *p, unsigned int len)
1079 {
1080         struct vhdr_sha512 *vh = hdr_priv(hdr);
1081         struct fio_sha512_ctx sha512_ctx = {
1082                 .buf = vh->sha512,
1083         };
1084
1085         fio_sha512_init(&sha512_ctx);
1086         fio_sha512_update(&sha512_ctx, p, len);
1087 }
1088
1089 static void fill_sha256(struct verify_header *hdr, void *p, unsigned int len)
1090 {
1091         struct vhdr_sha256 *vh = hdr_priv(hdr);
1092         struct fio_sha256_ctx sha256_ctx = {
1093                 .buf = vh->sha256,
1094         };
1095
1096         fio_sha256_init(&sha256_ctx);
1097         fio_sha256_update(&sha256_ctx, p, len);
1098         fio_sha256_final(&sha256_ctx);
1099 }
1100
1101 static void fill_sha1(struct verify_header *hdr, void *p, unsigned int len)
1102 {
1103         struct vhdr_sha1 *vh = hdr_priv(hdr);
1104         struct fio_sha1_ctx sha1_ctx = {
1105                 .H = vh->sha1,
1106         };
1107
1108         fio_sha1_init(&sha1_ctx);
1109         fio_sha1_update(&sha1_ctx, p, len);
1110         fio_sha1_final(&sha1_ctx);
1111 }
1112
1113 static void fill_crc7(struct verify_header *hdr, void *p, unsigned int len)
1114 {
1115         struct vhdr_crc7 *vh = hdr_priv(hdr);
1116
1117         vh->crc7 = fio_crc7(p, len);
1118 }
1119
1120 static void fill_crc16(struct verify_header *hdr, void *p, unsigned int len)
1121 {
1122         struct vhdr_crc16 *vh = hdr_priv(hdr);
1123
1124         vh->crc16 = fio_crc16(p, len);
1125 }
1126
1127 static void fill_crc32(struct verify_header *hdr, void *p, unsigned int len)
1128 {
1129         struct vhdr_crc32 *vh = hdr_priv(hdr);
1130
1131         vh->crc32 = fio_crc32(p, len);
1132 }
1133
1134 static void fill_crc32c(struct verify_header *hdr, void *p, unsigned int len)
1135 {
1136         struct vhdr_crc32 *vh = hdr_priv(hdr);
1137
1138         vh->crc32 = fio_crc32c(p, len);
1139 }
1140
1141 static void fill_crc64(struct verify_header *hdr, void *p, unsigned int len)
1142 {
1143         struct vhdr_crc64 *vh = hdr_priv(hdr);
1144
1145         vh->crc64 = fio_crc64(p, len);
1146 }
1147
1148 static void fill_md5(struct verify_header *hdr, void *p, unsigned int len)
1149 {
1150         struct vhdr_md5 *vh = hdr_priv(hdr);
1151         struct fio_md5_ctx md5_ctx = {
1152                 .hash = (uint32_t *) vh->md5_digest,
1153         };
1154
1155         fio_md5_init(&md5_ctx);
1156         fio_md5_update(&md5_ctx, p, len);
1157         fio_md5_final(&md5_ctx);
1158 }
1159
1160 static void __fill_hdr(struct thread_data *td, struct io_u *io_u,
1161                        struct verify_header *hdr, unsigned int header_num,
1162                        unsigned int header_len, uint64_t rand_seed)
1163 {
1164         void *p = hdr;
1165
1166         hdr->magic = FIO_HDR_MAGIC;
1167         hdr->verify_type = td->o.verify;
1168         hdr->len = header_len;
1169         hdr->rand_seed = rand_seed;
1170         hdr->offset = io_u->offset + header_num * td->o.verify_interval;
1171         hdr->time_sec = io_u->start_time.tv_sec;
1172         hdr->time_nsec = io_u->start_time.tv_nsec;
1173         hdr->thread = td->thread_number;
1174         hdr->numberio = io_u->numberio;
1175         hdr->crc32 = fio_crc32c(p, offsetof(struct verify_header, crc32));
1176 }
1177
1178
1179 static void fill_hdr(struct thread_data *td, struct io_u *io_u,
1180                      struct verify_header *hdr, unsigned int header_num,
1181                      unsigned int header_len, uint64_t rand_seed)
1182 {
1183         if (td->o.verify != VERIFY_PATTERN_NO_HDR)
1184                 __fill_hdr(td, io_u, hdr, header_num, header_len, rand_seed);
1185 }
1186
1187 static void populate_hdr(struct thread_data *td, struct io_u *io_u,
1188                          struct verify_header *hdr, unsigned int header_num,
1189                          unsigned int header_len)
1190 {
1191         unsigned int data_len;
1192         void *data;
1193         char *p;
1194
1195         p = (char *) hdr;
1196
1197         fill_hdr(td, io_u, hdr, header_num, header_len, io_u->rand_seed);
1198
1199         data_len = header_len - hdr_size(td, hdr);
1200
1201         data = p + hdr_size(td, hdr);
1202         switch (td->o.verify) {
1203         case VERIFY_MD5:
1204                 dprint(FD_VERIFY, "fill md5 io_u %p, len %u\n",
1205                                                 io_u, hdr->len);
1206                 fill_md5(hdr, data, data_len);
1207                 break;
1208         case VERIFY_CRC64:
1209                 dprint(FD_VERIFY, "fill crc64 io_u %p, len %u\n",
1210                                                 io_u, hdr->len);
1211                 fill_crc64(hdr, data, data_len);
1212                 break;
1213         case VERIFY_CRC32C:
1214         case VERIFY_CRC32C_INTEL:
1215                 dprint(FD_VERIFY, "fill crc32c io_u %p, len %u\n",
1216                                                 io_u, hdr->len);
1217                 fill_crc32c(hdr, data, data_len);
1218                 break;
1219         case VERIFY_CRC32:
1220                 dprint(FD_VERIFY, "fill crc32 io_u %p, len %u\n",
1221                                                 io_u, hdr->len);
1222                 fill_crc32(hdr, data, data_len);
1223                 break;
1224         case VERIFY_CRC16:
1225                 dprint(FD_VERIFY, "fill crc16 io_u %p, len %u\n",
1226                                                 io_u, hdr->len);
1227                 fill_crc16(hdr, data, data_len);
1228                 break;
1229         case VERIFY_CRC7:
1230                 dprint(FD_VERIFY, "fill crc7 io_u %p, len %u\n",
1231                                                 io_u, hdr->len);
1232                 fill_crc7(hdr, data, data_len);
1233                 break;
1234         case VERIFY_SHA256:
1235                 dprint(FD_VERIFY, "fill sha256 io_u %p, len %u\n",
1236                                                 io_u, hdr->len);
1237                 fill_sha256(hdr, data, data_len);
1238                 break;
1239         case VERIFY_SHA512:
1240                 dprint(FD_VERIFY, "fill sha512 io_u %p, len %u\n",
1241                                                 io_u, hdr->len);
1242                 fill_sha512(hdr, data, data_len);
1243                 break;
1244         case VERIFY_SHA3_224:
1245                 dprint(FD_VERIFY, "fill sha3-224 io_u %p, len %u\n",
1246                                                 io_u, hdr->len);
1247                 fill_sha3_224(hdr, data, data_len);
1248                 break;
1249         case VERIFY_SHA3_256:
1250                 dprint(FD_VERIFY, "fill sha3-256 io_u %p, len %u\n",
1251                                                 io_u, hdr->len);
1252                 fill_sha3_256(hdr, data, data_len);
1253                 break;
1254         case VERIFY_SHA3_384:
1255                 dprint(FD_VERIFY, "fill sha3-384 io_u %p, len %u\n",
1256                                                 io_u, hdr->len);
1257                 fill_sha3_384(hdr, data, data_len);
1258                 break;
1259         case VERIFY_SHA3_512:
1260                 dprint(FD_VERIFY, "fill sha3-512 io_u %p, len %u\n",
1261                                                 io_u, hdr->len);
1262                 fill_sha3_512(hdr, data, data_len);
1263                 break;
1264         case VERIFY_XXHASH:
1265                 dprint(FD_VERIFY, "fill xxhash io_u %p, len %u\n",
1266                                                 io_u, hdr->len);
1267                 fill_xxhash(hdr, data, data_len);
1268                 break;
1269         case VERIFY_SHA1:
1270                 dprint(FD_VERIFY, "fill sha1 io_u %p, len %u\n",
1271                                                 io_u, hdr->len);
1272                 fill_sha1(hdr, data, data_len);
1273                 break;
1274         case VERIFY_HDR_ONLY:
1275         case VERIFY_PATTERN:
1276         case VERIFY_PATTERN_NO_HDR:
1277                 /* nothing to do here */
1278                 break;
1279         default:
1280                 log_err("fio: bad verify type: %d\n", td->o.verify);
1281                 assert(0);
1282         }
1283
1284         if (td->o.verify_offset && hdr_size(td, hdr))
1285                 memswp(p, p + td->o.verify_offset, hdr_size(td, hdr));
1286 }
1287
1288 /*
1289  * fill body of io_u->buf with random data and add a header with the
1290  * checksum of choice
1291  */
1292 void populate_verify_io_u(struct thread_data *td, struct io_u *io_u)
1293 {
1294         if (td->o.verify == VERIFY_NULL)
1295                 return;
1296
1297         io_u->numberio = td->io_issues[io_u->ddir];
1298
1299         fill_pattern_headers(td, io_u, 0, 0);
1300 }
1301
1302 int get_next_verify(struct thread_data *td, struct io_u *io_u)
1303 {
1304         struct io_piece *ipo = NULL;
1305
1306         /*
1307          * this io_u is from a requeue, we already filled the offsets
1308          */
1309         if (io_u->file)
1310                 return 0;
1311
1312         if (!RB_EMPTY_ROOT(&td->io_hist_tree)) {
1313                 struct rb_node *n = rb_first(&td->io_hist_tree);
1314
1315                 ipo = rb_entry(n, struct io_piece, rb_node);
1316
1317                 /*
1318                  * Ensure that the associated IO has completed
1319                  */
1320                 read_barrier();
1321                 if (ipo->flags & IP_F_IN_FLIGHT)
1322                         goto nothing;
1323
1324                 rb_erase(n, &td->io_hist_tree);
1325                 assert(ipo->flags & IP_F_ONRB);
1326                 ipo->flags &= ~IP_F_ONRB;
1327         } else if (!flist_empty(&td->io_hist_list)) {
1328                 ipo = flist_first_entry(&td->io_hist_list, struct io_piece, list);
1329
1330                 /*
1331                  * Ensure that the associated IO has completed
1332                  */
1333                 read_barrier();
1334                 if (ipo->flags & IP_F_IN_FLIGHT)
1335                         goto nothing;
1336
1337                 flist_del(&ipo->list);
1338                 assert(ipo->flags & IP_F_ONLIST);
1339                 ipo->flags &= ~IP_F_ONLIST;
1340         }
1341
1342         if (ipo) {
1343                 td->io_hist_len--;
1344
1345                 io_u->offset = ipo->offset;
1346                 io_u->buflen = ipo->len;
1347                 io_u->numberio = ipo->numberio;
1348                 io_u->file = ipo->file;
1349                 io_u_set(td, io_u, IO_U_F_VER_LIST);
1350
1351                 if (ipo->flags & IP_F_TRIMMED)
1352                         io_u_set(td, io_u, IO_U_F_TRIMMED);
1353
1354                 if (!fio_file_open(io_u->file)) {
1355                         int r = td_io_open_file(td, io_u->file);
1356
1357                         if (r) {
1358                                 dprint(FD_VERIFY, "failed file %s open\n",
1359                                                 io_u->file->file_name);
1360                                 return 1;
1361                         }
1362                 }
1363
1364                 get_file(ipo->file);
1365                 assert(fio_file_open(io_u->file));
1366                 io_u->ddir = DDIR_READ;
1367                 io_u->xfer_buf = io_u->buf;
1368                 io_u->xfer_buflen = io_u->buflen;
1369
1370                 remove_trim_entry(td, ipo);
1371                 free(ipo);
1372                 dprint(FD_VERIFY, "get_next_verify: ret io_u %p\n", io_u);
1373
1374                 if (!td->o.verify_pattern_bytes) {
1375                         io_u->rand_seed = __rand(&td->verify_state);
1376                         if (sizeof(int) != sizeof(long *))
1377                                 io_u->rand_seed *= __rand(&td->verify_state);
1378                 }
1379                 return 0;
1380         }
1381
1382 nothing:
1383         dprint(FD_VERIFY, "get_next_verify: empty\n");
1384         return 1;
1385 }
1386
1387 void fio_verify_init(struct thread_data *td)
1388 {
1389         if (td->o.verify == VERIFY_CRC32C_INTEL ||
1390             td->o.verify == VERIFY_CRC32C) {
1391                 crc32c_arm64_probe();
1392                 crc32c_intel_probe();
1393         }
1394 }
1395
1396 static void *verify_async_thread(void *data)
1397 {
1398         struct thread_data *td = data;
1399         struct io_u *io_u;
1400         int ret = 0;
1401
1402         if (fio_option_is_set(&td->o, verify_cpumask) &&
1403             fio_setaffinity(td->pid, td->o.verify_cpumask)) {
1404                 log_err("fio: failed setting verify thread affinity\n");
1405                 goto done;
1406         }
1407
1408         do {
1409                 FLIST_HEAD(list);
1410
1411                 read_barrier();
1412                 if (td->verify_thread_exit)
1413                         break;
1414
1415                 pthread_mutex_lock(&td->io_u_lock);
1416
1417                 while (flist_empty(&td->verify_list) &&
1418                        !td->verify_thread_exit) {
1419                         ret = pthread_cond_wait(&td->verify_cond,
1420                                                         &td->io_u_lock);
1421                         if (ret) {
1422                                 pthread_mutex_unlock(&td->io_u_lock);
1423                                 break;
1424                         }
1425                 }
1426
1427                 flist_splice_init(&td->verify_list, &list);
1428                 pthread_mutex_unlock(&td->io_u_lock);
1429
1430                 if (flist_empty(&list))
1431                         continue;
1432
1433                 while (!flist_empty(&list)) {
1434                         io_u = flist_first_entry(&list, struct io_u, verify_list);
1435                         flist_del_init(&io_u->verify_list);
1436
1437                         io_u_set(td, io_u, IO_U_F_NO_FILE_PUT);
1438                         ret = verify_io_u(td, &io_u);
1439
1440                         put_io_u(td, io_u);
1441                         if (!ret)
1442                                 continue;
1443                         if (td_non_fatal_error(td, ERROR_TYPE_VERIFY_BIT, ret)) {
1444                                 update_error_count(td, ret);
1445                                 td_clear_error(td);
1446                                 ret = 0;
1447                         }
1448                 }
1449         } while (!ret);
1450
1451         if (ret) {
1452                 td_verror(td, ret, "async_verify");
1453                 if (td->o.verify_fatal)
1454                         fio_mark_td_terminate(td);
1455         }
1456
1457 done:
1458         pthread_mutex_lock(&td->io_u_lock);
1459         td->nr_verify_threads--;
1460         pthread_mutex_unlock(&td->io_u_lock);
1461
1462         pthread_cond_signal(&td->free_cond);
1463         return NULL;
1464 }
1465
1466 int verify_async_init(struct thread_data *td)
1467 {
1468         int i, ret;
1469         pthread_attr_t attr;
1470
1471         pthread_attr_init(&attr);
1472         pthread_attr_setstacksize(&attr, 2 * PTHREAD_STACK_MIN);
1473
1474         td->verify_thread_exit = 0;
1475
1476         td->verify_threads = malloc(sizeof(pthread_t) * td->o.verify_async);
1477         for (i = 0; i < td->o.verify_async; i++) {
1478                 ret = pthread_create(&td->verify_threads[i], &attr,
1479                                         verify_async_thread, td);
1480                 if (ret) {
1481                         log_err("fio: async verify creation failed: %s\n",
1482                                         strerror(ret));
1483                         break;
1484                 }
1485                 ret = pthread_detach(td->verify_threads[i]);
1486                 if (ret) {
1487                         log_err("fio: async verify thread detach failed: %s\n",
1488                                         strerror(ret));
1489                         break;
1490                 }
1491                 td->nr_verify_threads++;
1492         }
1493
1494         pthread_attr_destroy(&attr);
1495
1496         if (i != td->o.verify_async) {
1497                 log_err("fio: only %d verify threads started, exiting\n", i);
1498                 td->verify_thread_exit = 1;
1499                 write_barrier();
1500                 pthread_cond_broadcast(&td->verify_cond);
1501                 return 1;
1502         }
1503
1504         return 0;
1505 }
1506
1507 void verify_async_exit(struct thread_data *td)
1508 {
1509         td->verify_thread_exit = 1;
1510         write_barrier();
1511         pthread_cond_broadcast(&td->verify_cond);
1512
1513         pthread_mutex_lock(&td->io_u_lock);
1514
1515         while (td->nr_verify_threads)
1516                 pthread_cond_wait(&td->free_cond, &td->io_u_lock);
1517
1518         pthread_mutex_unlock(&td->io_u_lock);
1519         free(td->verify_threads);
1520         td->verify_threads = NULL;
1521 }
1522
1523 int paste_blockoff(char *buf, unsigned int len, void *priv)
1524 {
1525         struct io_u *io = priv;
1526         unsigned long long off;
1527
1528         typecheck(typeof(off), io->offset);
1529         off = cpu_to_le64((uint64_t)io->offset);
1530         len = min(len, (unsigned int)sizeof(off));
1531         memcpy(buf, &off, len);
1532         return 0;
1533 }
1534
1535 static int __fill_file_completions(struct thread_data *td,
1536                                    struct thread_io_list *s,
1537                                    struct fio_file *f, unsigned int *index)
1538 {
1539         unsigned int comps;
1540         int i, j;
1541
1542         if (!f->last_write_comp)
1543                 return 0;
1544
1545         if (td->io_blocks[DDIR_WRITE] < td->o.iodepth)
1546                 comps = td->io_blocks[DDIR_WRITE];
1547         else
1548                 comps = td->o.iodepth;
1549
1550         j = f->last_write_idx - 1;
1551         for (i = 0; i < comps; i++) {
1552                 if (j == -1)
1553                         j = td->o.iodepth - 1;
1554                 s->comps[*index].fileno = __cpu_to_le64(f->fileno);
1555                 s->comps[*index].offset = cpu_to_le64(f->last_write_comp[j]);
1556                 (*index)++;
1557                 j--;
1558         }
1559
1560         return comps;
1561 }
1562
1563 static int fill_file_completions(struct thread_data *td,
1564                                  struct thread_io_list *s, unsigned int *index)
1565 {
1566         struct fio_file *f;
1567         unsigned int i;
1568         int comps = 0;
1569
1570         for_each_file(td, f, i)
1571                 comps += __fill_file_completions(td, s, f, index);
1572
1573         return comps;
1574 }
1575
1576 struct all_io_list *get_all_io_list(int save_mask, size_t *sz)
1577 {
1578         struct all_io_list *rep;
1579         struct thread_data *td;
1580         size_t depth;
1581         void *next;
1582         int i, nr;
1583
1584         compiletime_assert(sizeof(struct all_io_list) == 8, "all_io_list");
1585
1586         /*
1587          * Calculate reply space needed. We need one 'io_state' per thread,
1588          * and the size will vary depending on depth.
1589          */
1590         depth = 0;
1591         nr = 0;
1592         for_each_td(td, i) {
1593                 if (save_mask != IO_LIST_ALL && (i + 1) != save_mask)
1594                         continue;
1595                 td->stop_io = 1;
1596                 td->flags |= TD_F_VSTATE_SAVED;
1597                 depth += (td->o.iodepth * td->o.nr_files);
1598                 nr++;
1599         }
1600
1601         if (!nr)
1602                 return NULL;
1603
1604         *sz = sizeof(*rep);
1605         *sz += nr * sizeof(struct thread_io_list);
1606         *sz += depth * sizeof(struct file_comp);
1607         rep = malloc(*sz);
1608         memset(rep, 0, *sz);
1609
1610         rep->threads = cpu_to_le64((uint64_t) nr);
1611
1612         next = &rep->state[0];
1613         for_each_td(td, i) {
1614                 struct thread_io_list *s = next;
1615                 unsigned int comps, index = 0;
1616
1617                 if (save_mask != IO_LIST_ALL && (i + 1) != save_mask)
1618                         continue;
1619
1620                 comps = fill_file_completions(td, s, &index);
1621
1622                 s->no_comps = cpu_to_le64((uint64_t) comps);
1623                 s->depth = cpu_to_le64((uint64_t) td->o.iodepth);
1624                 s->nofiles = cpu_to_le64((uint64_t) td->o.nr_files);
1625                 s->numberio = cpu_to_le64((uint64_t) td->io_issues[DDIR_WRITE]);
1626                 s->index = cpu_to_le64((uint64_t) i);
1627                 if (td->random_state.use64) {
1628                         s->rand.state64.s[0] = cpu_to_le64(td->random_state.state64.s1);
1629                         s->rand.state64.s[1] = cpu_to_le64(td->random_state.state64.s2);
1630                         s->rand.state64.s[2] = cpu_to_le64(td->random_state.state64.s3);
1631                         s->rand.state64.s[3] = cpu_to_le64(td->random_state.state64.s4);
1632                         s->rand.state64.s[4] = cpu_to_le64(td->random_state.state64.s5);
1633                         s->rand.state64.s[5] = 0;
1634                         s->rand.use64 = cpu_to_le64((uint64_t)1);
1635                 } else {
1636                         s->rand.state32.s[0] = cpu_to_le32(td->random_state.state32.s1);
1637                         s->rand.state32.s[1] = cpu_to_le32(td->random_state.state32.s2);
1638                         s->rand.state32.s[2] = cpu_to_le32(td->random_state.state32.s3);
1639                         s->rand.state32.s[3] = 0;
1640                         s->rand.use64 = 0;
1641                 }
1642                 s->name[sizeof(s->name) - 1] = '\0';
1643                 strncpy((char *) s->name, td->o.name, sizeof(s->name) - 1);
1644                 next = io_list_next(s);
1645         }
1646
1647         return rep;
1648 }
1649
1650 static int open_state_file(const char *name, const char *prefix, int num,
1651                            int for_write)
1652 {
1653         char out[PATH_MAX];
1654         int flags;
1655         int fd;
1656
1657         if (for_write)
1658                 flags = O_CREAT | O_TRUNC | O_WRONLY | O_SYNC;
1659         else
1660                 flags = O_RDONLY;
1661
1662         verify_state_gen_name(out, sizeof(out), name, prefix, num);
1663
1664         fd = open(out, flags, 0644);
1665         if (fd == -1) {
1666                 perror("fio: open state file");
1667                 log_err("fio: state file: %s (for_write=%d)\n", out, for_write);
1668                 return -1;
1669         }
1670
1671         return fd;
1672 }
1673
1674 static int write_thread_list_state(struct thread_io_list *s,
1675                                    const char *prefix)
1676 {
1677         struct verify_state_hdr hdr;
1678         uint64_t crc;
1679         ssize_t ret;
1680         int fd;
1681
1682         fd = open_state_file((const char *) s->name, prefix, s->index, 1);
1683         if (fd == -1)
1684                 return 1;
1685
1686         crc = fio_crc32c((void *)s, thread_io_list_sz(s));
1687
1688         hdr.version = cpu_to_le64((uint64_t) VSTATE_HDR_VERSION);
1689         hdr.size = cpu_to_le64((uint64_t) thread_io_list_sz(s));
1690         hdr.crc = cpu_to_le64(crc);
1691         ret = write(fd, &hdr, sizeof(hdr));
1692         if (ret != sizeof(hdr))
1693                 goto write_fail;
1694
1695         ret = write(fd, s, thread_io_list_sz(s));
1696         if (ret != thread_io_list_sz(s)) {
1697 write_fail:
1698                 if (ret < 0)
1699                         perror("fio: write state file");
1700                 log_err("fio: failed to write state file\n");
1701                 ret = 1;
1702         } else
1703                 ret = 0;
1704
1705         close(fd);
1706         return ret;
1707 }
1708
1709 void __verify_save_state(struct all_io_list *state, const char *prefix)
1710 {
1711         struct thread_io_list *s = &state->state[0];
1712         unsigned int i;
1713
1714         for (i = 0; i < le64_to_cpu(state->threads); i++) {
1715                 write_thread_list_state(s,  prefix);
1716                 s = io_list_next(s);
1717         }
1718 }
1719
1720 void verify_save_state(int mask)
1721 {
1722         struct all_io_list *state;
1723         size_t sz;
1724
1725         state = get_all_io_list(mask, &sz);
1726         if (state) {
1727                 char prefix[PATH_MAX];
1728
1729                 if (aux_path)
1730                         sprintf(prefix, "%s%clocal", aux_path, FIO_OS_PATH_SEPARATOR);
1731                 else
1732                         strcpy(prefix, "local");
1733
1734                 __verify_save_state(state, prefix);
1735                 free(state);
1736         }
1737 }
1738
1739 void verify_free_state(struct thread_data *td)
1740 {
1741         if (td->vstate)
1742                 free(td->vstate);
1743 }
1744
1745 void verify_assign_state(struct thread_data *td, void *p)
1746 {
1747         struct thread_io_list *s = p;
1748         int i;
1749
1750         s->no_comps = le64_to_cpu(s->no_comps);
1751         s->depth = le32_to_cpu(s->depth);
1752         s->nofiles = le32_to_cpu(s->nofiles);
1753         s->numberio = le64_to_cpu(s->numberio);
1754         s->rand.use64 = le64_to_cpu(s->rand.use64);
1755
1756         if (s->rand.use64) {
1757                 for (i = 0; i < 6; i++)
1758                         s->rand.state64.s[i] = le64_to_cpu(s->rand.state64.s[i]);
1759         } else {
1760                 for (i = 0; i < 4; i++)
1761                         s->rand.state32.s[i] = le32_to_cpu(s->rand.state32.s[i]);
1762         }
1763
1764         for (i = 0; i < s->no_comps; i++) {
1765                 s->comps[i].fileno = le64_to_cpu(s->comps[i].fileno);
1766                 s->comps[i].offset = le64_to_cpu(s->comps[i].offset);
1767         }
1768
1769         td->vstate = p;
1770 }
1771
1772 int verify_state_hdr(struct verify_state_hdr *hdr, struct thread_io_list *s)
1773 {
1774         uint64_t crc;
1775
1776         hdr->version = le64_to_cpu(hdr->version);
1777         hdr->size = le64_to_cpu(hdr->size);
1778         hdr->crc = le64_to_cpu(hdr->crc);
1779
1780         if (hdr->version != VSTATE_HDR_VERSION)
1781                 return 1;
1782
1783         crc = fio_crc32c((void *)s, hdr->size);
1784         if (crc != hdr->crc)
1785                 return 1;
1786
1787         return 0;
1788 }
1789
1790 int verify_load_state(struct thread_data *td, const char *prefix)
1791 {
1792         struct verify_state_hdr hdr;
1793         void *s = NULL;
1794         uint64_t crc;
1795         ssize_t ret;
1796         int fd;
1797
1798         if (!td->o.verify_state)
1799                 return 0;
1800
1801         fd = open_state_file(td->o.name, prefix, td->thread_number - 1, 0);
1802         if (fd == -1)
1803                 return 1;
1804
1805         ret = read(fd, &hdr, sizeof(hdr));
1806         if (ret != sizeof(hdr)) {
1807                 if (ret < 0)
1808                         td_verror(td, errno, "read verify state hdr");
1809                 log_err("fio: failed reading verify state header\n");
1810                 goto err;
1811         }
1812
1813         hdr.version = le64_to_cpu(hdr.version);
1814         hdr.size = le64_to_cpu(hdr.size);
1815         hdr.crc = le64_to_cpu(hdr.crc);
1816
1817         if (hdr.version != VSTATE_HDR_VERSION) {
1818                 log_err("fio: unsupported (%d) version in verify state header\n",
1819                                 (unsigned int) hdr.version);
1820                 goto err;
1821         }
1822
1823         s = malloc(hdr.size);
1824         ret = read(fd, s, hdr.size);
1825         if (ret != hdr.size) {
1826                 if (ret < 0)
1827                         td_verror(td, errno, "read verify state");
1828                 log_err("fio: failed reading verity state\n");
1829                 goto err;
1830         }
1831
1832         crc = fio_crc32c(s, hdr.size);
1833         if (crc != hdr.crc) {
1834                 log_err("fio: verify state is corrupt\n");
1835                 goto err;
1836         }
1837
1838         close(fd);
1839
1840         verify_assign_state(td, s);
1841         return 0;
1842 err:
1843         if (s)
1844                 free(s);
1845         close(fd);
1846         return 1;
1847 }
1848
1849 /*
1850  * Use the loaded verify state to know when to stop doing verification
1851  */
1852 int verify_state_should_stop(struct thread_data *td, struct io_u *io_u)
1853 {
1854         struct thread_io_list *s = td->vstate;
1855         struct fio_file *f = io_u->file;
1856         int i;
1857
1858         if (!s || !f)
1859                 return 0;
1860
1861         /*
1862          * If we're not into the window of issues - depth yet, continue. If
1863          * issue is shorter than depth, do check.
1864          */
1865         if ((td->io_blocks[DDIR_READ] < s->depth ||
1866             s->numberio - td->io_blocks[DDIR_READ] > s->depth) &&
1867             s->numberio > s->depth)
1868                 return 0;
1869
1870         /*
1871          * We're in the window of having to check if this io was
1872          * completed or not. If the IO was seen as completed, then
1873          * lets verify it.
1874          */
1875         for (i = 0; i < s->no_comps; i++) {
1876                 if (s->comps[i].fileno != f->fileno)
1877                         continue;
1878                 if (io_u->offset == s->comps[i].offset)
1879                         return 0;
1880         }
1881
1882         /*
1883          * Not found, we have to stop
1884          */
1885         return 1;
1886 }