qemu-io.c

   1 /*
   2  * Command line utility to exercise the QEMU I/O path.
   3  *
   4  * Copyright (C) 2009 Red Hat, Inc.
   5  * Copyright (c) 2003-2005 Silicon Graphics, Inc.
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   8  * See the COPYING file in the top-level directory.
   9  */
  10 #include <sys/types.h>
  11 #include <stdarg.h>
  12 #include <stdio.h>
  13 #include <getopt.h>
  14
  15 #include "qemu-common.h"
  16 #include "block_int.h"
  17 #include "cmd.h"
  18
  19 #define VERSION "0.0.1"
  20
  21 #define CMD_NOFILE_OK   0x01
  22
  23 char *progname;
  24 static BlockDriverState *bs;
  25
  26 static int misalign;
  27
  28 /*
  29  * Memory allocation helpers.
  30  *
  31  * Make sure memory is aligned by default, or purposefully misaligned if
  32  * that is specified on the command line.
  33  */
  34
  35 #define MISALIGN_OFFSET         16
  36 static void *qemu_io_alloc(size_t len, int pattern)
  37 {
  38         void *buf;
  39
  40         if (misalign)
  41                 len += MISALIGN_OFFSET;
  42         buf = qemu_memalign(512, len);
  43         memset(buf, pattern, len);
  44         if (misalign)
  45                 buf += MISALIGN_OFFSET;
  46         return buf;
  47 }
  48
  49 static void qemu_io_free(void *p)
  50 {
  51         if (misalign)
  52                 p -= MISALIGN_OFFSET;
  53         qemu_vfree(p);
  54 }
  55
  56 static void
  57 dump_buffer(char *buffer, int64_t offset, int len)
  58 {
  59         int i, j;
  60         char *p;
  61
  62         for (i = 0, p = buffer; i < len; i += 16) {
  63                 char    *s = p;
  64
  65                 printf("%08llx:  ", (unsigned long long)offset + i);
  66                 for (j = 0; j < 16 && i + j < len; j++, p++)
  67                         printf("%02x ", *p);
  68                 printf(" ");
  69                 for (j = 0; j < 16 && i + j < len; j++, s++) {
  70                         if (isalnum((int)*s))
  71                                 printf("%c", *s);
  72                         else
  73                                 printf(".");
  74                 }
  75                 printf("\n");
  76         }
  77 }
  78
  79 static void
  80 print_report(const char *op, struct timeval *t, int64_t offset,
  81                 int count, int total, int cnt, int Cflag)
  82 {
  83         char s1[64], s2[64], ts[64];
  84
  85         timestr(t, ts, sizeof(ts), Cflag ? VERBOSE_FIXED_TIME : 0);
  86         if (!Cflag) {
  87                 cvtstr((double)total, s1, sizeof(s1));
  88                 cvtstr(tdiv((double)total, *t), s2, sizeof(s2));
  89                 printf("%s %d/%d bytes at offset %lld\n",
  90                         op, total, count, (long long)offset);
  91                 printf("%s, %d ops; %s (%s/sec and %.4f ops/sec)\n",
  92                         s1, cnt, ts, s2, tdiv((double)cnt, *t));
  93         } else {/* bytes,ops,time,bytes/sec,ops/sec */
  94                 printf("%d,%d,%s,%.3f,%.3f\n",
  95                         total, cnt, ts,
  96                         tdiv((double)total, *t),
  97                         tdiv((double)cnt, *t));
  98         }
  99 }
 100
 101 static int do_read(char *buf, int64_t offset, int count, int *total)
 102 {
 103         int ret;
 104
 105         ret = bdrv_read(bs, offset >> 9, (uint8_t *)buf, count >> 9);
 106         if (ret < 0)
 107                 return ret;
 108         *total = count;
 109         return 1;
 110 }
 111
 112 static int do_write(char *buf, int64_t offset, int count, int *total)
 113 {
 114         int ret;
 115
 116         ret = bdrv_write(bs, offset >> 9, (uint8_t *)buf, count >> 9);
 117         if (ret < 0)
 118                 return ret;
 119         *total = count;
 120         return 1;
 121 }
 122
 123 static int do_pread(char *buf, int64_t offset, int count, int *total)
 124 {
 125         *total = bdrv_pread(bs, offset, (uint8_t *)buf, count);
 126         if (*total < 0)
 127                 return *total;
 128         return 1;
 129 }
 130
 131 static int do_pwrite(char *buf, int64_t offset, int count, int *total)
 132 {
 133         *total = bdrv_pwrite(bs, offset, (uint8_t *)buf, count);
 134         if (*total < 0)
 135                 return *total;
 136         return 1;
 137 }
 138
 139 #define NOT_DONE 0x7fffffff
 140 static void aio_rw_done(void *opaque, int ret)
 141 {
 142         *(int *)opaque = ret;
 143 }
 144
 145 static int do_aio_readv(QEMUIOVector *qiov, int64_t offset, int *total)
 146 {
 147         BlockDriverAIOCB *acb;
 148         int async_ret = NOT_DONE;
 149
 150         acb = bdrv_aio_readv(bs, offset >> 9, qiov, qiov->size >> 9,
 151                              aio_rw_done, &async_ret);
 152         if (!acb)
 153                 return -EIO;
 154
 155         while (async_ret == NOT_DONE)
 156                 qemu_aio_wait();
 157
 158         *total = qiov->size;
 159         return async_ret < 0 ? async_ret : 1;
 160 }
 161
 162 static int do_aio_writev(QEMUIOVector *qiov, int64_t offset, int *total)
 163 {
 164         BlockDriverAIOCB *acb;
 165         int async_ret = NOT_DONE;
 166
 167         acb = bdrv_aio_writev(bs, offset >> 9, qiov, qiov->size >> 9,
 168                               aio_rw_done, &async_ret);
 169         if (!acb)
 170                 return -EIO;
 171
 172         while (async_ret == NOT_DONE)
 173                 qemu_aio_wait();
 174
 175         *total = qiov->size;
 176         return async_ret < 0 ? async_ret : 1;
 177 }
 178
 179
 180 static const cmdinfo_t read_cmd;
 181
 182 static void
 183 read_help(void)
 184 {
 185         printf(
 186 "\n"
 187 " reads a range of bytes from the given offset\n"
 188 "\n"
 189 " Example:\n"
 190 " 'read -v 512 1k' - dumps 1 kilobyte read from 512 bytes into the file\n"
 191 "\n"
 192 " Reads a segment of the currently open file, optionally dumping it to the\n"
 193 " standard output stream (with -v option) for subsequent inspection.\n"
 194 " -p, -- use bdrv_pread to read the file\n"
 195 " -P, -- use a pattern to verify read data\n"
 196 " -C, -- report statistics in a machine parsable format\n"
 197 " -v, -- dump buffer to standard output\n"
 198 " -q, -- quite mode, do not show I/O statistics\n"
 199 "\n");
 200 }
 201
 202 static int
 203 read_f(int argc, char **argv)
 204 {
 205         struct timeval t1, t2;
 206         int Cflag = 0, pflag = 0, qflag = 0, vflag = 0;
 207         int c, cnt;
 208         char *buf;
 209         int64_t offset;
 210         int count, total;
 211         int pattern = 0;
 212         int Pflag = 0;
 213
 214         while ((c = getopt(argc, argv, "CpP:qv")) != EOF) {
 215                 switch (c) {
 216                 case 'C':
 217                         Cflag = 1;
 218                         break;
 219                 case 'p':
 220                         pflag = 1;
 221                         break;
 222                 case 'P':
 223                         Pflag = 1;
 224                         pattern = atoi(optarg);
 225                         break;
 226                 case 'q':
 227                         qflag = 1;
 228                         break;
 229                 case 'v':
 230                         vflag = 1;
 231                         break;
 232                 default:
 233                         return command_usage(&read_cmd);
 234                 }
 235         }
 236
 237         if (optind != argc - 2)
 238                 return command_usage(&read_cmd);
 239
 240         offset = cvtnum(argv[optind]);
 241         if (offset < 0) {
 242                 printf("non-numeric length argument -- %s\n", argv[optind]);
 243                 return 0;
 244         }
 245
 246         optind++;
 247         count = cvtnum(argv[optind]);
 248         if (count < 0) {
 249                 printf("non-numeric length argument -- %s\n", argv[optind]);
 250                 return 0;
 251         }
 252
 253         if (!pflag)
 254                 if (offset & 0x1ff) {
 255                         printf("offset %lld is not sector aligned\n",
 256                                 (long long)offset);
 257                         return 0;
 258
 259                 if (count & 0x1ff) {
 260                         printf("count %d is not sector aligned\n",
 261                                 count);
 262                         return 0;
 263                 }
 264         }
 265
 266         buf = qemu_io_alloc(count, 0xab);
 267
 268         gettimeofday(&t1, NULL);
 269         if (pflag)
 270                 cnt = do_pread(buf, offset, count, &total);
 271         else
 272                 cnt = do_read(buf, offset, count, &total);
 273         gettimeofday(&t2, NULL);
 274
 275         if (cnt < 0) {
 276                 printf("read failed: %s\n", strerror(-cnt));
 277                 return 0;
 278         }
 279
 280         if (Pflag) {
 281                 void* cmp_buf = malloc(count);
 282                 memset(cmp_buf, pattern, count);
 283                 if (memcmp(buf, cmp_buf, count)) {
 284                         printf("Pattern verification failed at offset %lld, "
 285                                 "%d bytes\n",
 286                                 (long long) offset, count);
 287                 }
 288                 free(cmp_buf);
 289         }
 290
 291         if (qflag)
 292                 return 0;
 293
 294         if (vflag)
 295                 dump_buffer(buf, offset, count);
 296
 297         /* Finally, report back -- -C gives a parsable format */
 298         t2 = tsub(t2, t1);
 299         print_report("read", &t2, offset, count, total, cnt, Cflag);
 300
 301         qemu_io_free(buf);
 302
 303         return 0;
 304 }
 305
 306 static const cmdinfo_t read_cmd = {
 307         .name           = "read",
 308         .altname        = "r",
 309         .cfunc          = read_f,
 310         .argmin         = 2,
 311         .argmax         = -1,
 312         .args           = "[-aCpqv] [-P pattern ] off len",
 313         .oneline        = "reads a number of bytes at a specified offset",
 314         .help           = read_help,
 315 };
 316
 317 static const cmdinfo_t readv_cmd;
 318
 319 static void
 320 readv_help(void)
 321 {
 322         printf(
 323 "\n"
 324 " reads a range of bytes from the given offset into multiple buffers\n"
 325 "\n"
 326 " Example:\n"
 327 " 'readv -v 512 1k 1k ' - dumps 2 kilobytes read from 512 bytes into the file\n"
 328 "\n"
 329 " Reads a segment of the currently open file, optionally dumping it to the\n"
 330 " standard output stream (with -v option) for subsequent inspection.\n"
 331 " Uses multiple iovec buffers if more than one byte range is specified.\n"
 332 " -C, -- report statistics in a machine parsable format\n"
 333 " -P, -- use a pattern to verify read data\n"
 334 " -v, -- dump buffer to standard output\n"
 335 " -q, -- quite mode, do not show I/O statistics\n"
 336 "\n");
 337 }
 338
 339 static int
 340 readv_f(int argc, char **argv)
 341 {
 342         struct timeval t1, t2;
 343         int Cflag = 0, qflag = 0, vflag = 0;
 344         int c, cnt;
 345         char *buf, *p;
 346         int64_t offset;
 347         int count = 0, total;
 348         int nr_iov, i;
 349         QEMUIOVector qiov;
 350         int pattern = 0;
 351         int Pflag = 0;
 352
 353         while ((c = getopt(argc, argv, "CP:qv")) != EOF) {
 354                 switch (c) {
 355                 case 'C':
 356                         Cflag = 1;
 357                         break;
 358                 case 'P':
 359                         Pflag = 1;
 360                         pattern = atoi(optarg);
 361                         break;
 362                 case 'q':
 363                         qflag = 1;
 364                         break;
 365                 case 'v':
 366                         vflag = 1;
 367                         break;
 368                 default:
 369                         return command_usage(&readv_cmd);
 370                 }
 371         }
 372
 373         if (optind > argc - 2)
 374                 return command_usage(&readv_cmd);
 375
 376
 377         offset = cvtnum(argv[optind]);
 378         if (offset < 0) {
 379                 printf("non-numeric length argument -- %s\n", argv[optind]);
 380                 return 0;
 381         }
 382         optind++;
 383
 384         if (offset & 0x1ff) {
 385                 printf("offset %lld is not sector aligned\n",
 386                         (long long)offset);
 387                 return 0;
 388         }
 389
 390         if (count & 0x1ff) {
 391                 printf("count %d is not sector aligned\n",
 392                         count);
 393                 return 0;
 394         }
 395
 396         for (i = optind; i < argc; i++) {
 397                 size_t len;
 398
 399                 len = cvtnum(argv[i]);
 400                 if (len < 0) {
 401                         printf("non-numeric length argument -- %s\n", argv[i]);
 402                         return 0;
 403                 }
 404                 count += len;
 405         }
 406
 407         nr_iov = argc - optind;
 408         qemu_iovec_init(&qiov, nr_iov);
 409         buf = p = qemu_io_alloc(count, 0xab);
 410         for (i = 0; i < nr_iov; i++) {
 411                 size_t len;
 412
 413                 len = cvtnum(argv[optind]);
 414                 if (len < 0) {
 415                         printf("non-numeric length argument -- %s\n",
 416                                 argv[optind]);
 417                         return 0;
 418                 }
 419
 420                 qemu_iovec_add(&qiov, p, len);
 421                 p += len;
 422                 optind++;
 423         }
 424
 425         gettimeofday(&t1, NULL);
 426         cnt = do_aio_readv(&qiov, offset, &total);
 427         gettimeofday(&t2, NULL);
 428
 429         if (cnt < 0) {
 430                 printf("readv failed: %s\n", strerror(-cnt));
 431                 return 0;
 432         }
 433
 434         if (Pflag) {
 435                 void* cmp_buf = malloc(count);
 436                 memset(cmp_buf, pattern, count);
 437                 if (memcmp(buf, cmp_buf, count)) {
 438                         printf("Pattern verification failed at offset %lld, "
 439                                 "%d bytes\n",
 440                                 (long long) offset, count);
 441                 }
 442                 free(cmp_buf);
 443         }
 444
 445         if (qflag)
 446                 return 0;
 447
 448         if (vflag)
 449                 dump_buffer(buf, offset, qiov.size);
 450
 451         /* Finally, report back -- -C gives a parsable format */
 452         t2 = tsub(t2, t1);
 453         print_report("read", &t2, offset, qiov.size, total, cnt, Cflag);
 454
 455         qemu_io_free(buf);
 456
 457         return 0;
 458 }
 459
 460 static const cmdinfo_t readv_cmd = {
 461         .name           = "readv",
 462         .cfunc          = readv_f,
 463         .argmin         = 2,
 464         .argmax         = -1,
 465         .args           = "[-Cqv] [-P pattern ] off len [len..]",
 466         .oneline        = "reads a number of bytes at a specified offset",
 467         .help           = readv_help,
 468 };
 469
 470 static const cmdinfo_t write_cmd;
 471
 472 static void
 473 write_help(void)
 474 {
 475         printf(
 476 "\n"
 477 " writes a range of bytes from the given offset\n"
 478 "\n"
 479 " Example:\n"
 480 " 'write 512 1k' - writes 1 kilobyte at 512 bytes into the open file\n"
 481 "\n"
 482 " Writes into a segment of the currently open file, using a buffer\n"
 483 " filled with a set pattern (0xcdcdcdcd).\n"
 484 " -p, -- use bdrv_pwrite to write the file\n"
 485 " -P, -- use different pattern to fill file\n"
 486 " -C, -- report statistics in a machine parsable format\n"
 487 " -q, -- quite mode, do not show I/O statistics\n"
 488 "\n");
 489 }
 490
 491 static int
 492 write_f(int argc, char **argv)
 493 {
 494         struct timeval t1, t2;
 495         int Cflag = 0, pflag = 0, qflag = 0;
 496         int c, cnt;
 497         char *buf;
 498         int64_t offset;
 499         int count, total;
 500         int pattern = 0xcd;
 501
 502         while ((c = getopt(argc, argv, "CpP:q")) != EOF) {
 503                 switch (c) {
 504                 case 'C':
 505                         Cflag = 1;
 506                         break;
 507                 case 'p':
 508                         pflag = 1;
 509                         break;
 510                 case 'P':
 511                         pattern = atoi(optarg);
 512                         break;
 513                 case 'q':
 514                         qflag = 1;
 515                         break;
 516                 default:
 517                         return command_usage(&write_cmd);
 518                 }
 519         }
 520
 521         if (optind != argc - 2)
 522                 return command_usage(&write_cmd);
 523
 524         offset = cvtnum(argv[optind]);
 525         if (offset < 0) {
 526                 printf("non-numeric length argument -- %s\n", argv[optind]);
 527                 return 0;
 528         }
 529
 530         optind++;
 531         count = cvtnum(argv[optind]);
 532         if (count < 0) {
 533                 printf("non-numeric length argument -- %s\n", argv[optind]);
 534                 return 0;
 535         }
 536
 537         if (!pflag) {
 538                 if (offset & 0x1ff) {
 539                         printf("offset %lld is not sector aligned\n",
 540                                 (long long)offset);
 541                         return 0;
 542                 }
 543
 544                 if (count & 0x1ff) {
 545                         printf("count %d is not sector aligned\n",
 546                                 count);
 547                         return 0;
 548                 }
 549         }
 550
 551         buf = qemu_io_alloc(count, pattern);
 552
 553         gettimeofday(&t1, NULL);
 554         if (pflag)
 555                 cnt = do_pwrite(buf, offset, count, &total);
 556         else
 557                 cnt = do_write(buf, offset, count, &total);
 558         gettimeofday(&t2, NULL);
 559
 560         if (cnt < 0) {
 561                 printf("write failed: %s\n", strerror(-cnt));
 562                 return 0;
 563         }
 564
 565         if (qflag)
 566                 return 0;
 567
 568         /* Finally, report back -- -C gives a parsable format */
 569         t2 = tsub(t2, t1);
 570         print_report("wrote", &t2, offset, count, total, cnt, Cflag);
 571
 572         qemu_io_free(buf);
 573
 574         return 0;
 575 }
 576
 577 static const cmdinfo_t write_cmd = {
 578         .name           = "write",
 579         .altname        = "w",
 580         .cfunc          = write_f,
 581         .argmin         = 2,
 582         .argmax         = -1,
 583         .args           = "[-aCpq] [-P pattern ] off len",
 584         .oneline        = "writes a number of bytes at a specified offset",
 585         .help           = write_help,
 586 };
 587
 588 static const cmdinfo_t writev_cmd;
 589
 590 static void
 591 writev_help(void)
 592 {
 593         printf(
 594 "\n"
 595 " writes a range of bytes from the given offset source from multiple buffers\n"
 596 "\n"
 597 " Example:\n"
 598 " 'write 512 1k 1k' - writes 2 kilobytes at 512 bytes into the open file\n"
 599 "\n"
 600 " Writes into a segment of the currently open file, using a buffer\n"
 601 " filled with a set pattern (0xcdcdcdcd).\n"
 602 " -P, -- use different pattern to fill file\n"
 603 " -C, -- report statistics in a machine parsable format\n"
 604 " -q, -- quite mode, do not show I/O statistics\n"
 605 "\n");
 606 }
 607
 608 static int
 609 writev_f(int argc, char **argv)
 610 {
 611         struct timeval t1, t2;
 612         int Cflag = 0, qflag = 0;
 613         int c, cnt;
 614         char *buf, *p;
 615         int64_t offset;
 616         int count = 0, total;
 617         int nr_iov, i;
 618         int pattern = 0xcd;
 619         QEMUIOVector qiov;
 620
 621         while ((c = getopt(argc, argv, "CqP:")) != EOF) {
 622                 switch (c) {
 623                 case 'C':
 624                         Cflag = 1;
 625                         break;
 626                 case 'q':
 627                         qflag = 1;
 628                         break;
 629                 case 'P':
 630                         pattern = atoi(optarg);
 631                         break;
 632                 default:
 633                         return command_usage(&writev_cmd);
 634                 }
 635         }
 636
 637         if (optind > argc - 2)
 638                 return command_usage(&writev_cmd);
 639
 640         offset = cvtnum(argv[optind]);
 641         if (offset < 0) {
 642                 printf("non-numeric length argument -- %s\n", argv[optind]);
 643                 return 0;
 644         }
 645         optind++;
 646
 647         if (offset & 0x1ff) {
 648                 printf("offset %lld is not sector aligned\n",
 649                         (long long)offset);
 650                 return 0;
 651         }
 652
 653         if (count & 0x1ff) {
 654                 printf("count %d is not sector aligned\n",
 655                         count);
 656                 return 0;
 657         }
 658
 659
 660         for (i = optind; i < argc; i++) {
 661                 size_t len;
 662
 663                 len = cvtnum(argv[optind]);
 664                 if (len < 0) {
 665                         printf("non-numeric length argument -- %s\n", argv[i]);
 666                         return 0;
 667                 }
 668                 count += len;
 669         }
 670
 671         nr_iov = argc - optind;
 672         qemu_iovec_init(&qiov, nr_iov);
 673         buf = p = qemu_io_alloc(count, pattern);
 674         for (i = 0; i < nr_iov; i++) {
 675                 size_t len;
 676
 677                 len = cvtnum(argv[optind]);
 678                 if (len < 0) {
 679                         printf("non-numeric length argument -- %s\n",
 680                                 argv[optind]);
 681                         return 0;
 682                 }
 683
 684                 qemu_iovec_add(&qiov, p, len);
 685                 p += len;
 686                 optind++;
 687         }
 688
 689         gettimeofday(&t1, NULL);
 690         cnt = do_aio_writev(&qiov, offset, &total);
 691         gettimeofday(&t2, NULL);
 692
 693         if (cnt < 0) {
 694                 printf("writev failed: %s\n", strerror(-cnt));
 695                 return 0;
 696         }
 697
 698         if (qflag)
 699                 return 0;
 700
 701         /* Finally, report back -- -C gives a parsable format */
 702         t2 = tsub(t2, t1);
 703         print_report("wrote", &t2, offset, qiov.size, total, cnt, Cflag);
 704
 705         qemu_io_free(buf);
 706
 707         return 0;
 708 }
 709
 710 static const cmdinfo_t writev_cmd = {
 711         .name           = "writev",
 712         .cfunc          = writev_f,
 713         .argmin         = 2,
 714         .argmax         = -1,
 715         .args           = "[-Cq] [-P pattern ] off len [len..]",
 716         .oneline        = "writes a number of bytes at a specified offset",
 717         .help           = writev_help,
 718 };
 719
 720 static int
 721 flush_f(int argc, char **argv)
 722 {
 723         bdrv_flush(bs);
 724         return 0;
 725 }
 726
 727 static const cmdinfo_t flush_cmd = {
 728         .name           = "flush",
 729         .altname        = "f",
 730         .cfunc          = flush_f,
 731         .oneline        = "flush all in-core file state to disk",
 732 };
 733
 734 static int
 735 truncate_f(int argc, char **argv)
 736 {
 737         int64_t offset;
 738         int ret;
 739
 740         offset = cvtnum(argv[1]);
 741         if (offset < 0) {
 742                 printf("non-numeric truncate argument -- %s\n", argv[1]);
 743                 return 0;
 744         }
 745
 746         ret = bdrv_truncate(bs, offset);
 747         if (ret < 0) {
 748                 printf("truncate: %s", strerror(ret));
 749                 return 0;
 750         }
 751
 752         return 0;
 753 }
 754
 755 static const cmdinfo_t truncate_cmd = {
 756         .name           = "truncate",
 757         .altname        = "t",
 758         .cfunc          = truncate_f,
 759         .argmin         = 1,
 760         .argmax         = 1,
 761         .args           = "off",
 762         .oneline        = "truncates the current file at the given offset",
 763 };
 764
 765 static int
 766 length_f(int argc, char **argv)
 767 {
 768         int64_t size;
 769         char s1[64];
 770
 771         size = bdrv_getlength(bs);
 772         if (size < 0) {
 773                 printf("getlength: %s", strerror(size));
 774                 return 0;
 775         }
 776
 777         cvtstr(size, s1, sizeof(s1));
 778         printf("%s\n", s1);
 779         return 0;
 780 }
 781
 782
 783 static const cmdinfo_t length_cmd = {
 784         .name           = "length",
 785         .altname        = "l",
 786         .cfunc          = length_f,
 787         .oneline        = "gets the length of the current file",
 788 };
 789
 790
 791 static int
 792 info_f(int argc, char **argv)
 793 {
 794         BlockDriverInfo bdi;
 795         char s1[64], s2[64];
 796         int ret;
 797
 798         if (bs->drv && bs->drv->format_name)
 799                 printf("format name: %s\n", bs->drv->format_name);
 800         if (bs->drv && bs->drv->protocol_name)
 801                 printf("format name: %s\n", bs->drv->protocol_name);
 802
 803         ret = bdrv_get_info(bs, &bdi);
 804         if (ret)
 805                 return 0;
 806
 807         cvtstr(bdi.cluster_size, s1, sizeof(s1));
 808         cvtstr(bdi.vm_state_offset, s2, sizeof(s2));
 809
 810         printf("cluster size: %s\n", s1);
 811         printf("vm state offset: %s\n", s2);
 812
 813         return 0;
 814 }
 815
 816
 817
 818 static const cmdinfo_t info_cmd = {
 819         .name           = "info",
 820         .altname        = "i",
 821         .cfunc          = info_f,
 822         .oneline        = "prints information about the current file",
 823 };
 824
 825 static int
 826 alloc_f(int argc, char **argv)
 827 {
 828         int64_t offset;
 829         int nb_sectors;
 830         char s1[64];
 831         int num;
 832         int ret;
 833         const char *retstr;
 834
 835         offset = cvtnum(argv[1]);
 836         if (offset & 0x1ff) {
 837                 printf("offset %lld is not sector aligned\n",
 838                         (long long)offset);
 839                 return 0;
 840         }
 841
 842         if (argc == 3)
 843                 nb_sectors = cvtnum(argv[2]);
 844         else
 845                 nb_sectors = 1;
 846
 847         ret = bdrv_is_allocated(bs, offset >> 9, nb_sectors, &num);
 848
 849         cvtstr(offset, s1, sizeof(s1));
 850
 851         retstr = ret ? "allocated" : "not allocated";
 852         if (nb_sectors == 1)
 853                 printf("sector %s at offset %s\n", retstr, s1);
 854         else
 855                 printf("%d/%d sectors %s at offset %s\n",
 856                         num, nb_sectors, retstr, s1);
 857         return 0;
 858 }
 859
 860 static const cmdinfo_t alloc_cmd = {
 861         .name           = "alloc",
 862         .altname        = "a",
 863         .argmin         = 1,
 864         .argmax         = 2,
 865         .cfunc          = alloc_f,
 866         .args           = "off [sectors]",
 867         .oneline        = "checks if a sector is present in the file",
 868 };
 869
 870 static int
 871 close_f(int argc, char **argv)
 872 {
 873         bdrv_close(bs);
 874         bs = NULL;
 875         return 0;
 876 }
 877
 878 static const cmdinfo_t close_cmd = {
 879         .name           = "close",
 880         .altname        = "c",
 881         .cfunc          = close_f,
 882         .oneline        = "close the current open file",
 883 };
 884
 885 static int openfile(char *name, int flags)
 886 {
 887         if (bs) {
 888                 fprintf(stderr, "file open already, try 'help close'\n");
 889                 return 1;
 890         }
 891
 892         bs = bdrv_new("hda");
 893         if (!bs)
 894                 return 1;
 895
 896         if (bdrv_open(bs, name, flags) == -1) {
 897                 fprintf(stderr, "%s: can't open device %s\n", progname, name);
 898                 bs = NULL;
 899                 return 1;
 900         }
 901
 902         return 0;
 903 }
 904
 905 static void
 906 open_help(void)
 907 {
 908         printf(
 909 "\n"
 910 " opens a new file in the requested mode\n"
 911 "\n"
 912 " Example:\n"
 913 " 'open -Cn /tmp/data' - creates/opens data file read-write and uncached\n"
 914 "\n"
 915 " Opens a file for subsequent use by all of the other qemu-io commands.\n"
 916 " -C, -- create new file if it doesn't exist\n"
 917 " -r, -- open file read-only\n"
 918 " -s, -- use snapshot file\n"
 919 " -n, -- disable host cache\n"
 920 "\n");
 921 }
 922
 923 static const cmdinfo_t open_cmd;
 924
 925 static int
 926 open_f(int argc, char **argv)
 927 {
 928         int flags = 0;
 929         int readonly = 0;
 930         int c;
 931
 932         while ((c = getopt(argc, argv, "snCr")) != EOF) {
 933                 switch (c) {
 934                 case 's':
 935                         flags |= BDRV_O_SNAPSHOT;
 936                         break;
 937                 case 'n':
 938                         flags |= BDRV_O_NOCACHE;
 939                         break;
 940                 case 'C':
 941                         flags |= BDRV_O_CREAT;
 942                         break;
 943                 case 'r':
 944                         readonly = 1;
 945                         break;
 946                 default:
 947                         return command_usage(&open_cmd);
 948                 }
 949         }
 950
 951         if (readonly)
 952                 flags |= BDRV_O_RDONLY;
 953         else
 954                 flags |= BDRV_O_RDWR;
 955
 956         if (optind != argc - 1)
 957                 return command_usage(&open_cmd);
 958
 959         return openfile(argv[optind], flags);
 960 }
 961
 962 static const cmdinfo_t open_cmd = {
 963         .name           = "open",
 964         .altname        = "o",
 965         .cfunc          = open_f,
 966         .argmin         = 1,
 967         .argmax         = -1,
 968         .flags          = CMD_NOFILE_OK,
 969         .args           = "[-Crsn] [path]",
 970         .oneline        = "open the file specified by path",
 971         .help           = open_help,
 972 };
 973
 974 static int
 975 init_args_command(
 976         int     index)
 977 {
 978         /* only one device allowed so far */
 979         if (index >= 1)
 980                 return 0;
 981         return ++index;
 982 }
 983
 984 static int
 985 init_check_command(
 986         const cmdinfo_t *ct)
 987 {
 988         if (ct->flags & CMD_FLAG_GLOBAL)
 989                 return 1;
 990         if (!(ct->flags & CMD_NOFILE_OK) && !bs) {
 991                 fprintf(stderr, "no file open, try 'help open'\n");
 992                 return 0;
 993         }
 994         return 1;
 995 }
 996
 997 static void usage(const char *name)
 998 {
 999         printf(
1000 "Usage: %s [-h] [-V] [-Crsnm] [-c cmd] ... [file]\n"
1001 "QEMU Disk excerciser\n"
1002 "\n"
1003 "  -C, --create         create new file if it doesn't exist\n"
1004 "  -c, --cmd            command to execute\n"
1005 "  -r, --read-only      export read-only\n"
1006 "  -s, --snapshot       use snapshot file\n"
1007 "  -n, --nocache        disable host cache\n"
1008 "  -m, --misalign       misalign allocations for O_DIRECT\n"
1009 "  -h, --help           display this help and exit\n"
1010 "  -V, --version        output version information and exit\n"
1011 "\n",
1012         name);
1013 }
1014
1015
1016 int main(int argc, char **argv)
1017 {
1018         int readonly = 0;
1019         const char *sopt = "hVc:Crsnm";
1020         struct option lopt[] = {
1021                 { "help", 0, 0, 'h' },
1022                 { "version", 0, 0, 'V' },
1023                 { "offset", 1, 0, 'o' },
1024                 { "cmd", 1, 0, 'c' },
1025                 { "create", 0, 0, 'C' },
1026                 { "read-only", 0, 0, 'r' },
1027                 { "snapshot", 0, 0, 's' },
1028                 { "nocache", 0, 0, 'n' },
1029                 { "misalign", 0, 0, 'm' },
1030                 { NULL, 0, 0, 0 }
1031         };
1032         int c;
1033         int opt_index = 0;
1034         int flags = 0;
1035
1036         progname = basename(argv[0]);
1037
1038         while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
1039                 switch (c) {
1040                 case 's':
1041                         flags |= BDRV_O_SNAPSHOT;
1042                         break;
1043                 case 'n':
1044                         flags |= BDRV_O_NOCACHE;
1045                         break;
1046                 case 'c':
1047                         add_user_command(optarg);
1048                         break;
1049                 case 'C':
1050                         flags |= BDRV_O_CREAT;
1051                         break;
1052                 case 'r':
1053                         readonly = 1;
1054                         break;
1055                 case 'm':
1056                         misalign = 1;
1057                         break;
1058                 case 'V':
1059                         printf("%s version %s\n", progname, VERSION);
1060                         exit(0);
1061                 case 'h':
1062                         usage(progname);
1063                         exit(0);
1064                 default:
1065                         usage(progname);
1066                         exit(1);
1067                 }
1068         }
1069
1070         if ((argc - optind) > 1) {
1071                 usage(progname);
1072                 exit(1);
1073         }
1074
1075         bdrv_init();
1076
1077         /* initialize commands */
1078         quit_init();
1079         help_init();
1080         add_command(&open_cmd);
1081         add_command(&close_cmd);
1082         add_command(&read_cmd);
1083         add_command(&readv_cmd);
1084         add_command(&write_cmd);
1085         add_command(&writev_cmd);
1086         add_command(&flush_cmd);
1087         add_command(&truncate_cmd);
1088         add_command(&length_cmd);
1089         add_command(&info_cmd);
1090         add_command(&alloc_cmd);
1091
1092         add_args_command(init_args_command);
1093         add_check_command(init_check_command);
1094
1095         /* open the device */
1096         if (readonly)
1097                 flags |= BDRV_O_RDONLY;
1098         else
1099                 flags |= BDRV_O_RDWR;
1100
1101         if ((argc - optind) == 1)
1102                 openfile(argv[optind], flags);
1103         command_loop();
1104
1105         if (bs)
1106                 bdrv_close(bs);
1107         return 0;
1108 }