1 /* 2 * Command line utility to exercise the QEMU I/O path. 3 * 4 * Copyright (C) 2009-2016 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 11 #include "qemu/osdep.h" 12 #include "qapi/error.h" 13 #include "qemu-io.h" 14 #include "sysemu/block-backend.h" 15 #include "block/block.h" 16 #include "block/block_int.h" /* for info_f() */ 17 #include "block/qapi.h" 18 #include "qemu/error-report.h" 19 #include "qemu/main-loop.h" 20 #include "qemu/option.h" 21 #include "qemu/timer.h" 22 #include "qemu/cutils.h" 23 24 #define CMD_NOFILE_OK 0x01 25 26 bool qemuio_misalign; 27 28 static cmdinfo_t *cmdtab; 29 static int ncmds; 30 31 static int compare_cmdname(const void *a, const void *b) 32 { 33 return strcmp(((const cmdinfo_t *)a)->name, 34 ((const cmdinfo_t *)b)->name); 35 } 36 37 void qemuio_add_command(const cmdinfo_t *ci) 38 { 39 /* ci->perm assumes a file is open, but the GLOBAL and NOFILE_OK 40 * flags allow it not to be, so that combination is invalid. 41 * Catch it now rather than letting it manifest as a crash if a 42 * particular set of command line options are used. 43 */ 44 assert(ci->perm == 0 || 45 (ci->flags & (CMD_FLAG_GLOBAL | CMD_NOFILE_OK)) == 0); 46 cmdtab = g_renew(cmdinfo_t, cmdtab, ++ncmds); 47 cmdtab[ncmds - 1] = *ci; 48 qsort(cmdtab, ncmds, sizeof(*cmdtab), compare_cmdname); 49 } 50 51 void qemuio_command_usage(const cmdinfo_t *ci) 52 { 53 printf("%s %s -- %s\n", ci->name, ci->args, ci->oneline); 54 } 55 56 static int init_check_command(BlockBackend *blk, const cmdinfo_t *ct) 57 { 58 if (ct->flags & CMD_FLAG_GLOBAL) { 59 return 1; 60 } 61 if (!(ct->flags & CMD_NOFILE_OK) && !blk) { 62 fprintf(stderr, "no file open, try 'help open'\n"); 63 return 0; 64 } 65 return 1; 66 } 67 68 static int command(BlockBackend *blk, const cmdinfo_t *ct, int argc, 69 char **argv) 70 { 71 char *cmd = argv[0]; 72 73 if (!init_check_command(blk, ct)) { 74 return -EINVAL; 75 } 76 77 if (argc - 1 < ct->argmin || (ct->argmax != -1 && argc - 1 > ct->argmax)) { 78 if (ct->argmax == -1) { 79 fprintf(stderr, 80 "bad argument count %d to %s, expected at least %d arguments\n", 81 argc-1, cmd, ct->argmin); 82 } else if (ct->argmin == ct->argmax) { 83 fprintf(stderr, 84 "bad argument count %d to %s, expected %d arguments\n", 85 argc-1, cmd, ct->argmin); 86 } else { 87 fprintf(stderr, 88 "bad argument count %d to %s, expected between %d and %d arguments\n", 89 argc-1, cmd, ct->argmin, ct->argmax); 90 } 91 return -EINVAL; 92 } 93 94 /* Request additional permissions if necessary for this command. The caller 95 * is responsible for restoring the original permissions afterwards if this 96 * is what it wants. */ 97 if (ct->perm && blk_is_available(blk)) { 98 uint64_t orig_perm, orig_shared_perm; 99 blk_get_perm(blk, &orig_perm, &orig_shared_perm); 100 101 if (ct->perm & ~orig_perm) { 102 uint64_t new_perm; 103 Error *local_err = NULL; 104 int ret; 105 106 new_perm = orig_perm | ct->perm; 107 108 ret = blk_set_perm(blk, new_perm, orig_shared_perm, &local_err); 109 if (ret < 0) { 110 error_report_err(local_err); 111 return ret; 112 } 113 } 114 } 115 116 optind = 0; 117 return ct->cfunc(blk, argc, argv); 118 } 119 120 static const cmdinfo_t *find_command(const char *cmd) 121 { 122 cmdinfo_t *ct; 123 124 for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++) { 125 if (strcmp(ct->name, cmd) == 0 || 126 (ct->altname && strcmp(ct->altname, cmd) == 0)) 127 { 128 return (const cmdinfo_t *)ct; 129 } 130 } 131 return NULL; 132 } 133 134 /* Invoke fn() for commands with a matching prefix */ 135 void qemuio_complete_command(const char *input, 136 void (*fn)(const char *cmd, void *opaque), 137 void *opaque) 138 { 139 cmdinfo_t *ct; 140 size_t input_len = strlen(input); 141 142 for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++) { 143 if (strncmp(input, ct->name, input_len) == 0) { 144 fn(ct->name, opaque); 145 } 146 } 147 } 148 149 static char **breakline(char *input, int *count) 150 { 151 int c = 0; 152 char *p; 153 char **rval = g_new0(char *, 1); 154 155 while (rval && (p = qemu_strsep(&input, " ")) != NULL) { 156 if (!*p) { 157 continue; 158 } 159 c++; 160 rval = g_renew(char *, rval, (c + 1)); 161 rval[c - 1] = p; 162 rval[c] = NULL; 163 } 164 *count = c; 165 return rval; 166 } 167 168 static int64_t cvtnum(const char *s) 169 { 170 int err; 171 uint64_t value; 172 173 err = qemu_strtosz(s, NULL, &value); 174 if (err < 0) { 175 return err; 176 } 177 if (value > INT64_MAX) { 178 return -ERANGE; 179 } 180 return value; 181 } 182 183 static void print_cvtnum_err(int64_t rc, const char *arg) 184 { 185 switch (rc) { 186 case -EINVAL: 187 printf("Parsing error: non-numeric argument," 188 " or extraneous/unrecognized suffix -- %s\n", arg); 189 break; 190 case -ERANGE: 191 printf("Parsing error: argument too large -- %s\n", arg); 192 break; 193 default: 194 printf("Parsing error: %s\n", arg); 195 } 196 } 197 198 #define EXABYTES(x) ((long long)(x) << 60) 199 #define PETABYTES(x) ((long long)(x) << 50) 200 #define TERABYTES(x) ((long long)(x) << 40) 201 #define GIGABYTES(x) ((long long)(x) << 30) 202 #define MEGABYTES(x) ((long long)(x) << 20) 203 #define KILOBYTES(x) ((long long)(x) << 10) 204 205 #define TO_EXABYTES(x) ((x) / EXABYTES(1)) 206 #define TO_PETABYTES(x) ((x) / PETABYTES(1)) 207 #define TO_TERABYTES(x) ((x) / TERABYTES(1)) 208 #define TO_GIGABYTES(x) ((x) / GIGABYTES(1)) 209 #define TO_MEGABYTES(x) ((x) / MEGABYTES(1)) 210 #define TO_KILOBYTES(x) ((x) / KILOBYTES(1)) 211 212 static void cvtstr(double value, char *str, size_t size) 213 { 214 char *trim; 215 const char *suffix; 216 217 if (value >= EXABYTES(1)) { 218 suffix = " EiB"; 219 snprintf(str, size - 4, "%.3f", TO_EXABYTES(value)); 220 } else if (value >= PETABYTES(1)) { 221 suffix = " PiB"; 222 snprintf(str, size - 4, "%.3f", TO_PETABYTES(value)); 223 } else if (value >= TERABYTES(1)) { 224 suffix = " TiB"; 225 snprintf(str, size - 4, "%.3f", TO_TERABYTES(value)); 226 } else if (value >= GIGABYTES(1)) { 227 suffix = " GiB"; 228 snprintf(str, size - 4, "%.3f", TO_GIGABYTES(value)); 229 } else if (value >= MEGABYTES(1)) { 230 suffix = " MiB"; 231 snprintf(str, size - 4, "%.3f", TO_MEGABYTES(value)); 232 } else if (value >= KILOBYTES(1)) { 233 suffix = " KiB"; 234 snprintf(str, size - 4, "%.3f", TO_KILOBYTES(value)); 235 } else { 236 suffix = " bytes"; 237 snprintf(str, size - 6, "%f", value); 238 } 239 240 trim = strstr(str, ".000"); 241 if (trim) { 242 strcpy(trim, suffix); 243 } else { 244 strcat(str, suffix); 245 } 246 } 247 248 249 250 static struct timeval tsub(struct timeval t1, struct timeval t2) 251 { 252 t1.tv_usec -= t2.tv_usec; 253 if (t1.tv_usec < 0) { 254 t1.tv_usec += 1000000; 255 t1.tv_sec--; 256 } 257 t1.tv_sec -= t2.tv_sec; 258 return t1; 259 } 260 261 static double tdiv(double value, struct timeval tv) 262 { 263 return value / ((double)tv.tv_sec + ((double)tv.tv_usec / 1000000.0)); 264 } 265 266 #define HOURS(sec) ((sec) / (60 * 60)) 267 #define MINUTES(sec) (((sec) % (60 * 60)) / 60) 268 #define SECONDS(sec) ((sec) % 60) 269 270 enum { 271 DEFAULT_TIME = 0x0, 272 TERSE_FIXED_TIME = 0x1, 273 VERBOSE_FIXED_TIME = 0x2, 274 }; 275 276 static void timestr(struct timeval *tv, char *ts, size_t size, int format) 277 { 278 double usec = (double)tv->tv_usec / 1000000.0; 279 280 if (format & TERSE_FIXED_TIME) { 281 if (!HOURS(tv->tv_sec)) { 282 snprintf(ts, size, "%u:%02u.%02u", 283 (unsigned int) MINUTES(tv->tv_sec), 284 (unsigned int) SECONDS(tv->tv_sec), 285 (unsigned int) (usec * 100)); 286 return; 287 } 288 format |= VERBOSE_FIXED_TIME; /* fallback if hours needed */ 289 } 290 291 if ((format & VERBOSE_FIXED_TIME) || tv->tv_sec) { 292 snprintf(ts, size, "%u:%02u:%02u.%02u", 293 (unsigned int) HOURS(tv->tv_sec), 294 (unsigned int) MINUTES(tv->tv_sec), 295 (unsigned int) SECONDS(tv->tv_sec), 296 (unsigned int) (usec * 100)); 297 } else { 298 snprintf(ts, size, "0.%04u sec", (unsigned int) (usec * 10000)); 299 } 300 } 301 302 /* 303 * Parse the pattern argument to various sub-commands. 304 * 305 * Because the pattern is used as an argument to memset it must evaluate 306 * to an unsigned integer that fits into a single byte. 307 */ 308 static int parse_pattern(const char *arg) 309 { 310 char *endptr = NULL; 311 long pattern; 312 313 pattern = strtol(arg, &endptr, 0); 314 if (pattern < 0 || pattern > UCHAR_MAX || *endptr != '\0') { 315 printf("%s is not a valid pattern byte\n", arg); 316 return -1; 317 } 318 319 return pattern; 320 } 321 322 /* 323 * Memory allocation helpers. 324 * 325 * Make sure memory is aligned by default, or purposefully misaligned if 326 * that is specified on the command line. 327 */ 328 329 #define MISALIGN_OFFSET 16 330 static void *qemu_io_alloc(BlockBackend *blk, size_t len, int pattern) 331 { 332 void *buf; 333 334 if (qemuio_misalign) { 335 len += MISALIGN_OFFSET; 336 } 337 buf = blk_blockalign(blk, len); 338 memset(buf, pattern, len); 339 if (qemuio_misalign) { 340 buf += MISALIGN_OFFSET; 341 } 342 return buf; 343 } 344 345 static void qemu_io_free(void *p) 346 { 347 if (qemuio_misalign) { 348 p -= MISALIGN_OFFSET; 349 } 350 qemu_vfree(p); 351 } 352 353 static void dump_buffer(const void *buffer, int64_t offset, int64_t len) 354 { 355 uint64_t i; 356 int j; 357 const uint8_t *p; 358 359 for (i = 0, p = buffer; i < len; i += 16) { 360 const uint8_t *s = p; 361 362 printf("%08" PRIx64 ": ", offset + i); 363 for (j = 0; j < 16 && i + j < len; j++, p++) { 364 printf("%02x ", *p); 365 } 366 printf(" "); 367 for (j = 0; j < 16 && i + j < len; j++, s++) { 368 if (isalnum(*s)) { 369 printf("%c", *s); 370 } else { 371 printf("."); 372 } 373 } 374 printf("\n"); 375 } 376 } 377 378 static void print_report(const char *op, struct timeval *t, int64_t offset, 379 int64_t count, int64_t total, int cnt, bool Cflag) 380 { 381 char s1[64], s2[64], ts[64]; 382 383 timestr(t, ts, sizeof(ts), Cflag ? VERBOSE_FIXED_TIME : 0); 384 if (!Cflag) { 385 cvtstr((double)total, s1, sizeof(s1)); 386 cvtstr(tdiv((double)total, *t), s2, sizeof(s2)); 387 printf("%s %"PRId64"/%"PRId64" bytes at offset %" PRId64 "\n", 388 op, total, count, offset); 389 printf("%s, %d ops; %s (%s/sec and %.4f ops/sec)\n", 390 s1, cnt, ts, s2, tdiv((double)cnt, *t)); 391 } else {/* bytes,ops,time,bytes/sec,ops/sec */ 392 printf("%"PRId64",%d,%s,%.3f,%.3f\n", 393 total, cnt, ts, 394 tdiv((double)total, *t), 395 tdiv((double)cnt, *t)); 396 } 397 } 398 399 /* 400 * Parse multiple length statements for vectored I/O, and construct an I/O 401 * vector matching it. 402 */ 403 static void * 404 create_iovec(BlockBackend *blk, QEMUIOVector *qiov, char **argv, int nr_iov, 405 int pattern) 406 { 407 size_t *sizes = g_new0(size_t, nr_iov); 408 size_t count = 0; 409 void *buf = NULL; 410 void *p; 411 int i; 412 413 for (i = 0; i < nr_iov; i++) { 414 char *arg = argv[i]; 415 int64_t len; 416 417 len = cvtnum(arg); 418 if (len < 0) { 419 print_cvtnum_err(len, arg); 420 goto fail; 421 } 422 423 if (len > BDRV_REQUEST_MAX_BYTES) { 424 printf("Argument '%s' exceeds maximum size %" PRIu64 "\n", arg, 425 (uint64_t)BDRV_REQUEST_MAX_BYTES); 426 goto fail; 427 } 428 429 if (count > BDRV_REQUEST_MAX_BYTES - len) { 430 printf("The total number of bytes exceed the maximum size %" PRIu64 431 "\n", (uint64_t)BDRV_REQUEST_MAX_BYTES); 432 goto fail; 433 } 434 435 sizes[i] = len; 436 count += len; 437 } 438 439 qemu_iovec_init(qiov, nr_iov); 440 441 buf = p = qemu_io_alloc(blk, count, pattern); 442 443 for (i = 0; i < nr_iov; i++) { 444 qemu_iovec_add(qiov, p, sizes[i]); 445 p += sizes[i]; 446 } 447 448 fail: 449 g_free(sizes); 450 return buf; 451 } 452 453 static int do_pread(BlockBackend *blk, char *buf, int64_t offset, 454 int64_t bytes, int64_t *total) 455 { 456 if (bytes > INT_MAX) { 457 return -ERANGE; 458 } 459 460 *total = blk_pread(blk, offset, (uint8_t *)buf, bytes); 461 if (*total < 0) { 462 return *total; 463 } 464 return 1; 465 } 466 467 static int do_pwrite(BlockBackend *blk, char *buf, int64_t offset, 468 int64_t bytes, int flags, int64_t *total) 469 { 470 if (bytes > INT_MAX) { 471 return -ERANGE; 472 } 473 474 *total = blk_pwrite(blk, offset, (uint8_t *)buf, bytes, flags); 475 if (*total < 0) { 476 return *total; 477 } 478 return 1; 479 } 480 481 typedef struct { 482 BlockBackend *blk; 483 int64_t offset; 484 int64_t bytes; 485 int64_t *total; 486 int flags; 487 int ret; 488 bool done; 489 } CoWriteZeroes; 490 491 static void coroutine_fn co_pwrite_zeroes_entry(void *opaque) 492 { 493 CoWriteZeroes *data = opaque; 494 495 data->ret = blk_co_pwrite_zeroes(data->blk, data->offset, data->bytes, 496 data->flags); 497 data->done = true; 498 if (data->ret < 0) { 499 *data->total = data->ret; 500 return; 501 } 502 503 *data->total = data->bytes; 504 } 505 506 static int do_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, 507 int64_t bytes, int flags, int64_t *total) 508 { 509 Coroutine *co; 510 CoWriteZeroes data = { 511 .blk = blk, 512 .offset = offset, 513 .bytes = bytes, 514 .total = total, 515 .flags = flags, 516 .done = false, 517 }; 518 519 if (bytes > INT_MAX) { 520 return -ERANGE; 521 } 522 523 co = qemu_coroutine_create(co_pwrite_zeroes_entry, &data); 524 bdrv_coroutine_enter(blk_bs(blk), co); 525 while (!data.done) { 526 aio_poll(blk_get_aio_context(blk), true); 527 } 528 if (data.ret < 0) { 529 return data.ret; 530 } else { 531 return 1; 532 } 533 } 534 535 static int do_write_compressed(BlockBackend *blk, char *buf, int64_t offset, 536 int64_t bytes, int64_t *total) 537 { 538 int ret; 539 540 if (bytes >> 9 > BDRV_REQUEST_MAX_SECTORS) { 541 return -ERANGE; 542 } 543 544 ret = blk_pwrite_compressed(blk, offset, buf, bytes); 545 if (ret < 0) { 546 return ret; 547 } 548 *total = bytes; 549 return 1; 550 } 551 552 static int do_load_vmstate(BlockBackend *blk, char *buf, int64_t offset, 553 int64_t count, int64_t *total) 554 { 555 if (count > INT_MAX) { 556 return -ERANGE; 557 } 558 559 *total = blk_load_vmstate(blk, (uint8_t *)buf, offset, count); 560 if (*total < 0) { 561 return *total; 562 } 563 return 1; 564 } 565 566 static int do_save_vmstate(BlockBackend *blk, char *buf, int64_t offset, 567 int64_t count, int64_t *total) 568 { 569 if (count > INT_MAX) { 570 return -ERANGE; 571 } 572 573 *total = blk_save_vmstate(blk, (uint8_t *)buf, offset, count); 574 if (*total < 0) { 575 return *total; 576 } 577 return 1; 578 } 579 580 #define NOT_DONE 0x7fffffff 581 static void aio_rw_done(void *opaque, int ret) 582 { 583 *(int *)opaque = ret; 584 } 585 586 static int do_aio_readv(BlockBackend *blk, QEMUIOVector *qiov, 587 int64_t offset, int *total) 588 { 589 int async_ret = NOT_DONE; 590 591 blk_aio_preadv(blk, offset, qiov, 0, aio_rw_done, &async_ret); 592 while (async_ret == NOT_DONE) { 593 main_loop_wait(false); 594 } 595 596 *total = qiov->size; 597 return async_ret < 0 ? async_ret : 1; 598 } 599 600 static int do_aio_writev(BlockBackend *blk, QEMUIOVector *qiov, 601 int64_t offset, int flags, int *total) 602 { 603 int async_ret = NOT_DONE; 604 605 blk_aio_pwritev(blk, offset, qiov, flags, aio_rw_done, &async_ret); 606 while (async_ret == NOT_DONE) { 607 main_loop_wait(false); 608 } 609 610 *total = qiov->size; 611 return async_ret < 0 ? async_ret : 1; 612 } 613 614 static void read_help(void) 615 { 616 printf( 617 "\n" 618 " reads a range of bytes from the given offset\n" 619 "\n" 620 " Example:\n" 621 " 'read -v 512 1k' - dumps 1 kilobyte read from 512 bytes into the file\n" 622 "\n" 623 " Reads a segment of the currently open file, optionally dumping it to the\n" 624 " standard output stream (with -v option) for subsequent inspection.\n" 625 " -b, -- read from the VM state rather than the virtual disk\n" 626 " -C, -- report statistics in a machine parsable format\n" 627 " -l, -- length for pattern verification (only with -P)\n" 628 " -p, -- ignored for backwards compatibility\n" 629 " -P, -- use a pattern to verify read data\n" 630 " -q, -- quiet mode, do not show I/O statistics\n" 631 " -s, -- start offset for pattern verification (only with -P)\n" 632 " -v, -- dump buffer to standard output\n" 633 "\n"); 634 } 635 636 static int read_f(BlockBackend *blk, int argc, char **argv); 637 638 static const cmdinfo_t read_cmd = { 639 .name = "read", 640 .altname = "r", 641 .cfunc = read_f, 642 .argmin = 2, 643 .argmax = -1, 644 .args = "[-abCqv] [-P pattern [-s off] [-l len]] off len", 645 .oneline = "reads a number of bytes at a specified offset", 646 .help = read_help, 647 }; 648 649 static int read_f(BlockBackend *blk, int argc, char **argv) 650 { 651 struct timeval t1, t2; 652 bool Cflag = false, qflag = false, vflag = false; 653 bool Pflag = false, sflag = false, lflag = false, bflag = false; 654 int c, cnt, ret; 655 char *buf; 656 int64_t offset; 657 int64_t count; 658 /* Some compilers get confused and warn if this is not initialized. */ 659 int64_t total = 0; 660 int pattern = 0; 661 int64_t pattern_offset = 0, pattern_count = 0; 662 663 while ((c = getopt(argc, argv, "bCl:pP:qs:v")) != -1) { 664 switch (c) { 665 case 'b': 666 bflag = true; 667 break; 668 case 'C': 669 Cflag = true; 670 break; 671 case 'l': 672 lflag = true; 673 pattern_count = cvtnum(optarg); 674 if (pattern_count < 0) { 675 print_cvtnum_err(pattern_count, optarg); 676 return pattern_count; 677 } 678 break; 679 case 'p': 680 /* Ignored for backwards compatibility */ 681 break; 682 case 'P': 683 Pflag = true; 684 pattern = parse_pattern(optarg); 685 if (pattern < 0) { 686 return -EINVAL; 687 } 688 break; 689 case 'q': 690 qflag = true; 691 break; 692 case 's': 693 sflag = true; 694 pattern_offset = cvtnum(optarg); 695 if (pattern_offset < 0) { 696 print_cvtnum_err(pattern_offset, optarg); 697 return pattern_offset; 698 } 699 break; 700 case 'v': 701 vflag = true; 702 break; 703 default: 704 qemuio_command_usage(&read_cmd); 705 return -EINVAL; 706 } 707 } 708 709 if (optind != argc - 2) { 710 qemuio_command_usage(&read_cmd); 711 return -EINVAL; 712 } 713 714 offset = cvtnum(argv[optind]); 715 if (offset < 0) { 716 print_cvtnum_err(offset, argv[optind]); 717 return offset; 718 } 719 720 optind++; 721 count = cvtnum(argv[optind]); 722 if (count < 0) { 723 print_cvtnum_err(count, argv[optind]); 724 return count; 725 } else if (count > BDRV_REQUEST_MAX_BYTES) { 726 printf("length cannot exceed %" PRIu64 ", given %s\n", 727 (uint64_t)BDRV_REQUEST_MAX_BYTES, argv[optind]); 728 return -EINVAL; 729 } 730 731 if (!Pflag && (lflag || sflag)) { 732 qemuio_command_usage(&read_cmd); 733 return -EINVAL; 734 } 735 736 if (!lflag) { 737 pattern_count = count - pattern_offset; 738 } 739 740 if ((pattern_count < 0) || (pattern_count + pattern_offset > count)) { 741 printf("pattern verification range exceeds end of read data\n"); 742 return -EINVAL; 743 } 744 745 if (bflag) { 746 if (!QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE)) { 747 printf("%" PRId64 " is not a sector-aligned value for 'offset'\n", 748 offset); 749 return -EINVAL; 750 } 751 if (!QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE)) { 752 printf("%"PRId64" is not a sector-aligned value for 'count'\n", 753 count); 754 return -EINVAL; 755 } 756 } 757 758 buf = qemu_io_alloc(blk, count, 0xab); 759 760 gettimeofday(&t1, NULL); 761 if (bflag) { 762 ret = do_load_vmstate(blk, buf, offset, count, &total); 763 } else { 764 ret = do_pread(blk, buf, offset, count, &total); 765 } 766 gettimeofday(&t2, NULL); 767 768 if (ret < 0) { 769 printf("read failed: %s\n", strerror(-ret)); 770 goto out; 771 } 772 cnt = ret; 773 774 ret = 0; 775 776 if (Pflag) { 777 void *cmp_buf = g_malloc(pattern_count); 778 memset(cmp_buf, pattern, pattern_count); 779 if (memcmp(buf + pattern_offset, cmp_buf, pattern_count)) { 780 printf("Pattern verification failed at offset %" 781 PRId64 ", %"PRId64" bytes\n", 782 offset + pattern_offset, pattern_count); 783 ret = -EINVAL; 784 } 785 g_free(cmp_buf); 786 } 787 788 if (qflag) { 789 goto out; 790 } 791 792 if (vflag) { 793 dump_buffer(buf, offset, count); 794 } 795 796 /* Finally, report back -- -C gives a parsable format */ 797 t2 = tsub(t2, t1); 798 print_report("read", &t2, offset, count, total, cnt, Cflag); 799 800 out: 801 qemu_io_free(buf); 802 return ret; 803 } 804 805 static void readv_help(void) 806 { 807 printf( 808 "\n" 809 " reads a range of bytes from the given offset into multiple buffers\n" 810 "\n" 811 " Example:\n" 812 " 'readv -v 512 1k 1k ' - dumps 2 kilobytes read from 512 bytes into the file\n" 813 "\n" 814 " Reads a segment of the currently open file, optionally dumping it to the\n" 815 " standard output stream (with -v option) for subsequent inspection.\n" 816 " Uses multiple iovec buffers if more than one byte range is specified.\n" 817 " -C, -- report statistics in a machine parsable format\n" 818 " -P, -- use a pattern to verify read data\n" 819 " -v, -- dump buffer to standard output\n" 820 " -q, -- quiet mode, do not show I/O statistics\n" 821 "\n"); 822 } 823 824 static int readv_f(BlockBackend *blk, int argc, char **argv); 825 826 static const cmdinfo_t readv_cmd = { 827 .name = "readv", 828 .cfunc = readv_f, 829 .argmin = 2, 830 .argmax = -1, 831 .args = "[-Cqv] [-P pattern] off len [len..]", 832 .oneline = "reads a number of bytes at a specified offset", 833 .help = readv_help, 834 }; 835 836 static int readv_f(BlockBackend *blk, int argc, char **argv) 837 { 838 struct timeval t1, t2; 839 bool Cflag = false, qflag = false, vflag = false; 840 int c, cnt, ret; 841 char *buf; 842 int64_t offset; 843 /* Some compilers get confused and warn if this is not initialized. */ 844 int total = 0; 845 int nr_iov; 846 QEMUIOVector qiov; 847 int pattern = 0; 848 bool Pflag = false; 849 850 while ((c = getopt(argc, argv, "CP:qv")) != -1) { 851 switch (c) { 852 case 'C': 853 Cflag = true; 854 break; 855 case 'P': 856 Pflag = true; 857 pattern = parse_pattern(optarg); 858 if (pattern < 0) { 859 return -EINVAL; 860 } 861 break; 862 case 'q': 863 qflag = true; 864 break; 865 case 'v': 866 vflag = true; 867 break; 868 default: 869 qemuio_command_usage(&readv_cmd); 870 return -EINVAL; 871 } 872 } 873 874 if (optind > argc - 2) { 875 qemuio_command_usage(&readv_cmd); 876 return -EINVAL; 877 } 878 879 880 offset = cvtnum(argv[optind]); 881 if (offset < 0) { 882 print_cvtnum_err(offset, argv[optind]); 883 return offset; 884 } 885 optind++; 886 887 nr_iov = argc - optind; 888 buf = create_iovec(blk, &qiov, &argv[optind], nr_iov, 0xab); 889 if (buf == NULL) { 890 return -EINVAL; 891 } 892 893 gettimeofday(&t1, NULL); 894 ret = do_aio_readv(blk, &qiov, offset, &total); 895 gettimeofday(&t2, NULL); 896 897 if (ret < 0) { 898 printf("readv failed: %s\n", strerror(-ret)); 899 goto out; 900 } 901 cnt = ret; 902 903 ret = 0; 904 905 if (Pflag) { 906 void *cmp_buf = g_malloc(qiov.size); 907 memset(cmp_buf, pattern, qiov.size); 908 if (memcmp(buf, cmp_buf, qiov.size)) { 909 printf("Pattern verification failed at offset %" 910 PRId64 ", %zd bytes\n", offset, qiov.size); 911 ret = -EINVAL; 912 } 913 g_free(cmp_buf); 914 } 915 916 if (qflag) { 917 goto out; 918 } 919 920 if (vflag) { 921 dump_buffer(buf, offset, qiov.size); 922 } 923 924 /* Finally, report back -- -C gives a parsable format */ 925 t2 = tsub(t2, t1); 926 print_report("read", &t2, offset, qiov.size, total, cnt, Cflag); 927 928 out: 929 qemu_iovec_destroy(&qiov); 930 qemu_io_free(buf); 931 return ret; 932 } 933 934 static void write_help(void) 935 { 936 printf( 937 "\n" 938 " writes a range of bytes from the given offset\n" 939 "\n" 940 " Example:\n" 941 " 'write 512 1k' - writes 1 kilobyte at 512 bytes into the open file\n" 942 "\n" 943 " Writes into a segment of the currently open file, using a buffer\n" 944 " filled with a set pattern (0xcdcdcdcd).\n" 945 " -b, -- write to the VM state rather than the virtual disk\n" 946 " -c, -- write compressed data with blk_write_compressed\n" 947 " -f, -- use Force Unit Access semantics\n" 948 " -p, -- ignored for backwards compatibility\n" 949 " -P, -- use different pattern to fill file\n" 950 " -C, -- report statistics in a machine parsable format\n" 951 " -q, -- quiet mode, do not show I/O statistics\n" 952 " -u, -- with -z, allow unmapping\n" 953 " -z, -- write zeroes using blk_co_pwrite_zeroes\n" 954 "\n"); 955 } 956 957 static int write_f(BlockBackend *blk, int argc, char **argv); 958 959 static const cmdinfo_t write_cmd = { 960 .name = "write", 961 .altname = "w", 962 .cfunc = write_f, 963 .perm = BLK_PERM_WRITE, 964 .argmin = 2, 965 .argmax = -1, 966 .args = "[-bcCfquz] [-P pattern] off len", 967 .oneline = "writes a number of bytes at a specified offset", 968 .help = write_help, 969 }; 970 971 static int write_f(BlockBackend *blk, int argc, char **argv) 972 { 973 struct timeval t1, t2; 974 bool Cflag = false, qflag = false, bflag = false; 975 bool Pflag = false, zflag = false, cflag = false; 976 int flags = 0; 977 int c, cnt, ret; 978 char *buf = NULL; 979 int64_t offset; 980 int64_t count; 981 /* Some compilers get confused and warn if this is not initialized. */ 982 int64_t total = 0; 983 int pattern = 0xcd; 984 985 while ((c = getopt(argc, argv, "bcCfpP:quz")) != -1) { 986 switch (c) { 987 case 'b': 988 bflag = true; 989 break; 990 case 'c': 991 cflag = true; 992 break; 993 case 'C': 994 Cflag = true; 995 break; 996 case 'f': 997 flags |= BDRV_REQ_FUA; 998 break; 999 case 'p': 1000 /* Ignored for backwards compatibility */ 1001 break; 1002 case 'P': 1003 Pflag = true; 1004 pattern = parse_pattern(optarg); 1005 if (pattern < 0) { 1006 return -EINVAL; 1007 } 1008 break; 1009 case 'q': 1010 qflag = true; 1011 break; 1012 case 'u': 1013 flags |= BDRV_REQ_MAY_UNMAP; 1014 break; 1015 case 'z': 1016 zflag = true; 1017 break; 1018 default: 1019 qemuio_command_usage(&write_cmd); 1020 return -EINVAL; 1021 } 1022 } 1023 1024 if (optind != argc - 2) { 1025 qemuio_command_usage(&write_cmd); 1026 return -EINVAL; 1027 } 1028 1029 if (bflag && zflag) { 1030 printf("-b and -z cannot be specified at the same time\n"); 1031 return -EINVAL; 1032 } 1033 1034 if ((flags & BDRV_REQ_FUA) && (bflag || cflag)) { 1035 printf("-f and -b or -c cannot be specified at the same time\n"); 1036 return -EINVAL; 1037 } 1038 1039 if ((flags & BDRV_REQ_MAY_UNMAP) && !zflag) { 1040 printf("-u requires -z to be specified\n"); 1041 return -EINVAL; 1042 } 1043 1044 if (zflag && Pflag) { 1045 printf("-z and -P cannot be specified at the same time\n"); 1046 return -EINVAL; 1047 } 1048 1049 offset = cvtnum(argv[optind]); 1050 if (offset < 0) { 1051 print_cvtnum_err(offset, argv[optind]); 1052 return offset; 1053 } 1054 1055 optind++; 1056 count = cvtnum(argv[optind]); 1057 if (count < 0) { 1058 print_cvtnum_err(count, argv[optind]); 1059 return count; 1060 } else if (count > BDRV_REQUEST_MAX_BYTES) { 1061 printf("length cannot exceed %" PRIu64 ", given %s\n", 1062 (uint64_t)BDRV_REQUEST_MAX_BYTES, argv[optind]); 1063 return -EINVAL; 1064 } 1065 1066 if (bflag || cflag) { 1067 if (!QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE)) { 1068 printf("%" PRId64 " is not a sector-aligned value for 'offset'\n", 1069 offset); 1070 return -EINVAL; 1071 } 1072 1073 if (!QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE)) { 1074 printf("%"PRId64" is not a sector-aligned value for 'count'\n", 1075 count); 1076 return -EINVAL; 1077 } 1078 } 1079 1080 if (!zflag) { 1081 buf = qemu_io_alloc(blk, count, pattern); 1082 } 1083 1084 gettimeofday(&t1, NULL); 1085 if (bflag) { 1086 ret = do_save_vmstate(blk, buf, offset, count, &total); 1087 } else if (zflag) { 1088 ret = do_co_pwrite_zeroes(blk, offset, count, flags, &total); 1089 } else if (cflag) { 1090 ret = do_write_compressed(blk, buf, offset, count, &total); 1091 } else { 1092 ret = do_pwrite(blk, buf, offset, count, flags, &total); 1093 } 1094 gettimeofday(&t2, NULL); 1095 1096 if (ret < 0) { 1097 printf("write failed: %s\n", strerror(-ret)); 1098 goto out; 1099 } 1100 cnt = ret; 1101 1102 ret = 0; 1103 1104 if (qflag) { 1105 goto out; 1106 } 1107 1108 /* Finally, report back -- -C gives a parsable format */ 1109 t2 = tsub(t2, t1); 1110 print_report("wrote", &t2, offset, count, total, cnt, Cflag); 1111 1112 out: 1113 if (!zflag) { 1114 qemu_io_free(buf); 1115 } 1116 return ret; 1117 } 1118 1119 static void 1120 writev_help(void) 1121 { 1122 printf( 1123 "\n" 1124 " writes a range of bytes from the given offset source from multiple buffers\n" 1125 "\n" 1126 " Example:\n" 1127 " 'writev 512 1k 1k' - writes 2 kilobytes at 512 bytes into the open file\n" 1128 "\n" 1129 " Writes into a segment of the currently open file, using a buffer\n" 1130 " filled with a set pattern (0xcdcdcdcd).\n" 1131 " -P, -- use different pattern to fill file\n" 1132 " -C, -- report statistics in a machine parsable format\n" 1133 " -f, -- use Force Unit Access semantics\n" 1134 " -q, -- quiet mode, do not show I/O statistics\n" 1135 "\n"); 1136 } 1137 1138 static int writev_f(BlockBackend *blk, int argc, char **argv); 1139 1140 static const cmdinfo_t writev_cmd = { 1141 .name = "writev", 1142 .cfunc = writev_f, 1143 .perm = BLK_PERM_WRITE, 1144 .argmin = 2, 1145 .argmax = -1, 1146 .args = "[-Cfq] [-P pattern] off len [len..]", 1147 .oneline = "writes a number of bytes at a specified offset", 1148 .help = writev_help, 1149 }; 1150 1151 static int writev_f(BlockBackend *blk, int argc, char **argv) 1152 { 1153 struct timeval t1, t2; 1154 bool Cflag = false, qflag = false; 1155 int flags = 0; 1156 int c, cnt, ret; 1157 char *buf; 1158 int64_t offset; 1159 /* Some compilers get confused and warn if this is not initialized. */ 1160 int total = 0; 1161 int nr_iov; 1162 int pattern = 0xcd; 1163 QEMUIOVector qiov; 1164 1165 while ((c = getopt(argc, argv, "CfqP:")) != -1) { 1166 switch (c) { 1167 case 'C': 1168 Cflag = true; 1169 break; 1170 case 'f': 1171 flags |= BDRV_REQ_FUA; 1172 break; 1173 case 'q': 1174 qflag = true; 1175 break; 1176 case 'P': 1177 pattern = parse_pattern(optarg); 1178 if (pattern < 0) { 1179 return -EINVAL; 1180 } 1181 break; 1182 default: 1183 qemuio_command_usage(&writev_cmd); 1184 return -EINVAL; 1185 } 1186 } 1187 1188 if (optind > argc - 2) { 1189 qemuio_command_usage(&writev_cmd); 1190 return -EINVAL; 1191 } 1192 1193 offset = cvtnum(argv[optind]); 1194 if (offset < 0) { 1195 print_cvtnum_err(offset, argv[optind]); 1196 return offset; 1197 } 1198 optind++; 1199 1200 nr_iov = argc - optind; 1201 buf = create_iovec(blk, &qiov, &argv[optind], nr_iov, pattern); 1202 if (buf == NULL) { 1203 return -EINVAL; 1204 } 1205 1206 gettimeofday(&t1, NULL); 1207 ret = do_aio_writev(blk, &qiov, offset, flags, &total); 1208 gettimeofday(&t2, NULL); 1209 1210 if (ret < 0) { 1211 printf("writev failed: %s\n", strerror(-ret)); 1212 goto out; 1213 } 1214 cnt = ret; 1215 1216 ret = 0; 1217 1218 if (qflag) { 1219 goto out; 1220 } 1221 1222 /* Finally, report back -- -C gives a parsable format */ 1223 t2 = tsub(t2, t1); 1224 print_report("wrote", &t2, offset, qiov.size, total, cnt, Cflag); 1225 out: 1226 qemu_iovec_destroy(&qiov); 1227 qemu_io_free(buf); 1228 return ret; 1229 } 1230 1231 struct aio_ctx { 1232 BlockBackend *blk; 1233 QEMUIOVector qiov; 1234 int64_t offset; 1235 char *buf; 1236 bool qflag; 1237 bool vflag; 1238 bool Cflag; 1239 bool Pflag; 1240 bool zflag; 1241 BlockAcctCookie acct; 1242 int pattern; 1243 struct timeval t1; 1244 }; 1245 1246 static void aio_write_done(void *opaque, int ret) 1247 { 1248 struct aio_ctx *ctx = opaque; 1249 struct timeval t2; 1250 1251 gettimeofday(&t2, NULL); 1252 1253 1254 if (ret < 0) { 1255 printf("aio_write failed: %s\n", strerror(-ret)); 1256 block_acct_failed(blk_get_stats(ctx->blk), &ctx->acct); 1257 goto out; 1258 } 1259 1260 block_acct_done(blk_get_stats(ctx->blk), &ctx->acct); 1261 1262 if (ctx->qflag) { 1263 goto out; 1264 } 1265 1266 /* Finally, report back -- -C gives a parsable format */ 1267 t2 = tsub(t2, ctx->t1); 1268 print_report("wrote", &t2, ctx->offset, ctx->qiov.size, 1269 ctx->qiov.size, 1, ctx->Cflag); 1270 out: 1271 if (!ctx->zflag) { 1272 qemu_io_free(ctx->buf); 1273 qemu_iovec_destroy(&ctx->qiov); 1274 } 1275 g_free(ctx); 1276 } 1277 1278 static void aio_read_done(void *opaque, int ret) 1279 { 1280 struct aio_ctx *ctx = opaque; 1281 struct timeval t2; 1282 1283 gettimeofday(&t2, NULL); 1284 1285 if (ret < 0) { 1286 printf("readv failed: %s\n", strerror(-ret)); 1287 block_acct_failed(blk_get_stats(ctx->blk), &ctx->acct); 1288 goto out; 1289 } 1290 1291 if (ctx->Pflag) { 1292 void *cmp_buf = g_malloc(ctx->qiov.size); 1293 1294 memset(cmp_buf, ctx->pattern, ctx->qiov.size); 1295 if (memcmp(ctx->buf, cmp_buf, ctx->qiov.size)) { 1296 printf("Pattern verification failed at offset %" 1297 PRId64 ", %zd bytes\n", ctx->offset, ctx->qiov.size); 1298 } 1299 g_free(cmp_buf); 1300 } 1301 1302 block_acct_done(blk_get_stats(ctx->blk), &ctx->acct); 1303 1304 if (ctx->qflag) { 1305 goto out; 1306 } 1307 1308 if (ctx->vflag) { 1309 dump_buffer(ctx->buf, ctx->offset, ctx->qiov.size); 1310 } 1311 1312 /* Finally, report back -- -C gives a parsable format */ 1313 t2 = tsub(t2, ctx->t1); 1314 print_report("read", &t2, ctx->offset, ctx->qiov.size, 1315 ctx->qiov.size, 1, ctx->Cflag); 1316 out: 1317 qemu_io_free(ctx->buf); 1318 qemu_iovec_destroy(&ctx->qiov); 1319 g_free(ctx); 1320 } 1321 1322 static void aio_read_help(void) 1323 { 1324 printf( 1325 "\n" 1326 " asynchronously reads a range of bytes from the given offset\n" 1327 "\n" 1328 " Example:\n" 1329 " 'aio_read -v 512 1k 1k ' - dumps 2 kilobytes read from 512 bytes into the file\n" 1330 "\n" 1331 " Reads a segment of the currently open file, optionally dumping it to the\n" 1332 " standard output stream (with -v option) for subsequent inspection.\n" 1333 " The read is performed asynchronously and the aio_flush command must be\n" 1334 " used to ensure all outstanding aio requests have been completed.\n" 1335 " Note that due to its asynchronous nature, this command will be\n" 1336 " considered successful once the request is submitted, independently\n" 1337 " of potential I/O errors or pattern mismatches.\n" 1338 " -C, -- report statistics in a machine parsable format\n" 1339 " -P, -- use a pattern to verify read data\n" 1340 " -i, -- treat request as invalid, for exercising stats\n" 1341 " -v, -- dump buffer to standard output\n" 1342 " -q, -- quiet mode, do not show I/O statistics\n" 1343 "\n"); 1344 } 1345 1346 static int aio_read_f(BlockBackend *blk, int argc, char **argv); 1347 1348 static const cmdinfo_t aio_read_cmd = { 1349 .name = "aio_read", 1350 .cfunc = aio_read_f, 1351 .argmin = 2, 1352 .argmax = -1, 1353 .args = "[-Ciqv] [-P pattern] off len [len..]", 1354 .oneline = "asynchronously reads a number of bytes", 1355 .help = aio_read_help, 1356 }; 1357 1358 static int aio_read_f(BlockBackend *blk, int argc, char **argv) 1359 { 1360 int nr_iov, c; 1361 struct aio_ctx *ctx = g_new0(struct aio_ctx, 1); 1362 1363 ctx->blk = blk; 1364 while ((c = getopt(argc, argv, "CP:iqv")) != -1) { 1365 switch (c) { 1366 case 'C': 1367 ctx->Cflag = true; 1368 break; 1369 case 'P': 1370 ctx->Pflag = true; 1371 ctx->pattern = parse_pattern(optarg); 1372 if (ctx->pattern < 0) { 1373 g_free(ctx); 1374 return -EINVAL; 1375 } 1376 break; 1377 case 'i': 1378 printf("injecting invalid read request\n"); 1379 block_acct_invalid(blk_get_stats(blk), BLOCK_ACCT_READ); 1380 g_free(ctx); 1381 return 0; 1382 case 'q': 1383 ctx->qflag = true; 1384 break; 1385 case 'v': 1386 ctx->vflag = true; 1387 break; 1388 default: 1389 g_free(ctx); 1390 qemuio_command_usage(&aio_read_cmd); 1391 return -EINVAL; 1392 } 1393 } 1394 1395 if (optind > argc - 2) { 1396 g_free(ctx); 1397 qemuio_command_usage(&aio_read_cmd); 1398 return -EINVAL; 1399 } 1400 1401 ctx->offset = cvtnum(argv[optind]); 1402 if (ctx->offset < 0) { 1403 int ret = ctx->offset; 1404 print_cvtnum_err(ret, argv[optind]); 1405 g_free(ctx); 1406 return ret; 1407 } 1408 optind++; 1409 1410 nr_iov = argc - optind; 1411 ctx->buf = create_iovec(blk, &ctx->qiov, &argv[optind], nr_iov, 0xab); 1412 if (ctx->buf == NULL) { 1413 block_acct_invalid(blk_get_stats(blk), BLOCK_ACCT_READ); 1414 g_free(ctx); 1415 return -EINVAL; 1416 } 1417 1418 gettimeofday(&ctx->t1, NULL); 1419 block_acct_start(blk_get_stats(blk), &ctx->acct, ctx->qiov.size, 1420 BLOCK_ACCT_READ); 1421 blk_aio_preadv(blk, ctx->offset, &ctx->qiov, 0, aio_read_done, ctx); 1422 return 0; 1423 } 1424 1425 static void aio_write_help(void) 1426 { 1427 printf( 1428 "\n" 1429 " asynchronously writes a range of bytes from the given offset source\n" 1430 " from multiple buffers\n" 1431 "\n" 1432 " Example:\n" 1433 " 'aio_write 512 1k 1k' - writes 2 kilobytes at 512 bytes into the open file\n" 1434 "\n" 1435 " Writes into a segment of the currently open file, using a buffer\n" 1436 " filled with a set pattern (0xcdcdcdcd).\n" 1437 " The write is performed asynchronously and the aio_flush command must be\n" 1438 " used to ensure all outstanding aio requests have been completed.\n" 1439 " Note that due to its asynchronous nature, this command will be\n" 1440 " considered successful once the request is submitted, independently\n" 1441 " of potential I/O errors or pattern mismatches.\n" 1442 " -P, -- use different pattern to fill file\n" 1443 " -C, -- report statistics in a machine parsable format\n" 1444 " -f, -- use Force Unit Access semantics\n" 1445 " -i, -- treat request as invalid, for exercising stats\n" 1446 " -q, -- quiet mode, do not show I/O statistics\n" 1447 " -u, -- with -z, allow unmapping\n" 1448 " -z, -- write zeroes using blk_aio_pwrite_zeroes\n" 1449 "\n"); 1450 } 1451 1452 static int aio_write_f(BlockBackend *blk, int argc, char **argv); 1453 1454 static const cmdinfo_t aio_write_cmd = { 1455 .name = "aio_write", 1456 .cfunc = aio_write_f, 1457 .perm = BLK_PERM_WRITE, 1458 .argmin = 2, 1459 .argmax = -1, 1460 .args = "[-Cfiquz] [-P pattern] off len [len..]", 1461 .oneline = "asynchronously writes a number of bytes", 1462 .help = aio_write_help, 1463 }; 1464 1465 static int aio_write_f(BlockBackend *blk, int argc, char **argv) 1466 { 1467 int nr_iov, c; 1468 int pattern = 0xcd; 1469 struct aio_ctx *ctx = g_new0(struct aio_ctx, 1); 1470 int flags = 0; 1471 1472 ctx->blk = blk; 1473 while ((c = getopt(argc, argv, "CfiqP:uz")) != -1) { 1474 switch (c) { 1475 case 'C': 1476 ctx->Cflag = true; 1477 break; 1478 case 'f': 1479 flags |= BDRV_REQ_FUA; 1480 break; 1481 case 'q': 1482 ctx->qflag = true; 1483 break; 1484 case 'u': 1485 flags |= BDRV_REQ_MAY_UNMAP; 1486 break; 1487 case 'P': 1488 pattern = parse_pattern(optarg); 1489 if (pattern < 0) { 1490 g_free(ctx); 1491 return -EINVAL; 1492 } 1493 break; 1494 case 'i': 1495 printf("injecting invalid write request\n"); 1496 block_acct_invalid(blk_get_stats(blk), BLOCK_ACCT_WRITE); 1497 g_free(ctx); 1498 return 0; 1499 case 'z': 1500 ctx->zflag = true; 1501 break; 1502 default: 1503 g_free(ctx); 1504 qemuio_command_usage(&aio_write_cmd); 1505 return -EINVAL; 1506 } 1507 } 1508 1509 if (optind > argc - 2) { 1510 g_free(ctx); 1511 qemuio_command_usage(&aio_write_cmd); 1512 return -EINVAL; 1513 } 1514 1515 if (ctx->zflag && optind != argc - 2) { 1516 printf("-z supports only a single length parameter\n"); 1517 g_free(ctx); 1518 return -EINVAL; 1519 } 1520 1521 if ((flags & BDRV_REQ_MAY_UNMAP) && !ctx->zflag) { 1522 printf("-u requires -z to be specified\n"); 1523 g_free(ctx); 1524 return -EINVAL; 1525 } 1526 1527 if (ctx->zflag && ctx->Pflag) { 1528 printf("-z and -P cannot be specified at the same time\n"); 1529 g_free(ctx); 1530 return -EINVAL; 1531 } 1532 1533 ctx->offset = cvtnum(argv[optind]); 1534 if (ctx->offset < 0) { 1535 int ret = ctx->offset; 1536 print_cvtnum_err(ret, argv[optind]); 1537 g_free(ctx); 1538 return ret; 1539 } 1540 optind++; 1541 1542 if (ctx->zflag) { 1543 int64_t count = cvtnum(argv[optind]); 1544 if (count < 0) { 1545 print_cvtnum_err(count, argv[optind]); 1546 g_free(ctx); 1547 return count; 1548 } 1549 1550 ctx->qiov.size = count; 1551 blk_aio_pwrite_zeroes(blk, ctx->offset, count, flags, aio_write_done, 1552 ctx); 1553 } else { 1554 nr_iov = argc - optind; 1555 ctx->buf = create_iovec(blk, &ctx->qiov, &argv[optind], nr_iov, 1556 pattern); 1557 if (ctx->buf == NULL) { 1558 block_acct_invalid(blk_get_stats(blk), BLOCK_ACCT_WRITE); 1559 g_free(ctx); 1560 return -EINVAL; 1561 } 1562 1563 gettimeofday(&ctx->t1, NULL); 1564 block_acct_start(blk_get_stats(blk), &ctx->acct, ctx->qiov.size, 1565 BLOCK_ACCT_WRITE); 1566 1567 blk_aio_pwritev(blk, ctx->offset, &ctx->qiov, flags, aio_write_done, 1568 ctx); 1569 } 1570 1571 return 0; 1572 } 1573 1574 static int aio_flush_f(BlockBackend *blk, int argc, char **argv) 1575 { 1576 BlockAcctCookie cookie; 1577 block_acct_start(blk_get_stats(blk), &cookie, 0, BLOCK_ACCT_FLUSH); 1578 blk_drain_all(); 1579 block_acct_done(blk_get_stats(blk), &cookie); 1580 return 0; 1581 } 1582 1583 static const cmdinfo_t aio_flush_cmd = { 1584 .name = "aio_flush", 1585 .cfunc = aio_flush_f, 1586 .oneline = "completes all outstanding aio requests" 1587 }; 1588 1589 static int flush_f(BlockBackend *blk, int argc, char **argv) 1590 { 1591 return blk_flush(blk); 1592 } 1593 1594 static const cmdinfo_t flush_cmd = { 1595 .name = "flush", 1596 .altname = "f", 1597 .cfunc = flush_f, 1598 .oneline = "flush all in-core file state to disk", 1599 }; 1600 1601 static int truncate_f(BlockBackend *blk, int argc, char **argv) 1602 { 1603 Error *local_err = NULL; 1604 int64_t offset; 1605 int ret; 1606 1607 offset = cvtnum(argv[1]); 1608 if (offset < 0) { 1609 print_cvtnum_err(offset, argv[1]); 1610 return offset; 1611 } 1612 1613 ret = blk_truncate(blk, offset, PREALLOC_MODE_OFF, &local_err); 1614 if (ret < 0) { 1615 error_report_err(local_err); 1616 return ret; 1617 } 1618 1619 return 0; 1620 } 1621 1622 static const cmdinfo_t truncate_cmd = { 1623 .name = "truncate", 1624 .altname = "t", 1625 .cfunc = truncate_f, 1626 .perm = BLK_PERM_WRITE | BLK_PERM_RESIZE, 1627 .argmin = 1, 1628 .argmax = 1, 1629 .args = "off", 1630 .oneline = "truncates the current file at the given offset", 1631 }; 1632 1633 static int length_f(BlockBackend *blk, int argc, char **argv) 1634 { 1635 int64_t size; 1636 char s1[64]; 1637 1638 size = blk_getlength(blk); 1639 if (size < 0) { 1640 printf("getlength: %s\n", strerror(-size)); 1641 return size; 1642 } 1643 1644 cvtstr(size, s1, sizeof(s1)); 1645 printf("%s\n", s1); 1646 return 0; 1647 } 1648 1649 1650 static const cmdinfo_t length_cmd = { 1651 .name = "length", 1652 .altname = "l", 1653 .cfunc = length_f, 1654 .oneline = "gets the length of the current file", 1655 }; 1656 1657 1658 static int info_f(BlockBackend *blk, int argc, char **argv) 1659 { 1660 BlockDriverState *bs = blk_bs(blk); 1661 BlockDriverInfo bdi; 1662 ImageInfoSpecific *spec_info; 1663 char s1[64], s2[64]; 1664 int ret; 1665 1666 if (bs->drv && bs->drv->format_name) { 1667 printf("format name: %s\n", bs->drv->format_name); 1668 } 1669 if (bs->drv && bs->drv->protocol_name) { 1670 printf("format name: %s\n", bs->drv->protocol_name); 1671 } 1672 1673 ret = bdrv_get_info(bs, &bdi); 1674 if (ret) { 1675 return ret; 1676 } 1677 1678 cvtstr(bdi.cluster_size, s1, sizeof(s1)); 1679 cvtstr(bdi.vm_state_offset, s2, sizeof(s2)); 1680 1681 printf("cluster size: %s\n", s1); 1682 printf("vm state offset: %s\n", s2); 1683 1684 spec_info = bdrv_get_specific_info(bs); 1685 if (spec_info) { 1686 printf("Format specific information:\n"); 1687 bdrv_image_info_specific_dump(fprintf, stdout, spec_info); 1688 qapi_free_ImageInfoSpecific(spec_info); 1689 } 1690 1691 return 0; 1692 } 1693 1694 1695 1696 static const cmdinfo_t info_cmd = { 1697 .name = "info", 1698 .altname = "i", 1699 .cfunc = info_f, 1700 .oneline = "prints information about the current file", 1701 }; 1702 1703 static void discard_help(void) 1704 { 1705 printf( 1706 "\n" 1707 " discards a range of bytes from the given offset\n" 1708 "\n" 1709 " Example:\n" 1710 " 'discard 512 1k' - discards 1 kilobyte from 512 bytes into the file\n" 1711 "\n" 1712 " Discards a segment of the currently open file.\n" 1713 " -C, -- report statistics in a machine parsable format\n" 1714 " -q, -- quiet mode, do not show I/O statistics\n" 1715 "\n"); 1716 } 1717 1718 static int discard_f(BlockBackend *blk, int argc, char **argv); 1719 1720 static const cmdinfo_t discard_cmd = { 1721 .name = "discard", 1722 .altname = "d", 1723 .cfunc = discard_f, 1724 .perm = BLK_PERM_WRITE, 1725 .argmin = 2, 1726 .argmax = -1, 1727 .args = "[-Cq] off len", 1728 .oneline = "discards a number of bytes at a specified offset", 1729 .help = discard_help, 1730 }; 1731 1732 static int discard_f(BlockBackend *blk, int argc, char **argv) 1733 { 1734 struct timeval t1, t2; 1735 bool Cflag = false, qflag = false; 1736 int c, ret; 1737 int64_t offset, bytes; 1738 1739 while ((c = getopt(argc, argv, "Cq")) != -1) { 1740 switch (c) { 1741 case 'C': 1742 Cflag = true; 1743 break; 1744 case 'q': 1745 qflag = true; 1746 break; 1747 default: 1748 qemuio_command_usage(&discard_cmd); 1749 return -EINVAL; 1750 } 1751 } 1752 1753 if (optind != argc - 2) { 1754 qemuio_command_usage(&discard_cmd); 1755 return -EINVAL; 1756 } 1757 1758 offset = cvtnum(argv[optind]); 1759 if (offset < 0) { 1760 print_cvtnum_err(offset, argv[optind]); 1761 return offset; 1762 } 1763 1764 optind++; 1765 bytes = cvtnum(argv[optind]); 1766 if (bytes < 0) { 1767 print_cvtnum_err(bytes, argv[optind]); 1768 return bytes; 1769 } else if (bytes >> BDRV_SECTOR_BITS > BDRV_REQUEST_MAX_SECTORS) { 1770 printf("length cannot exceed %"PRIu64", given %s\n", 1771 (uint64_t)BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS, 1772 argv[optind]); 1773 return -EINVAL; 1774 } 1775 1776 gettimeofday(&t1, NULL); 1777 ret = blk_pdiscard(blk, offset, bytes); 1778 gettimeofday(&t2, NULL); 1779 1780 if (ret < 0) { 1781 printf("discard failed: %s\n", strerror(-ret)); 1782 return ret; 1783 } 1784 1785 /* Finally, report back -- -C gives a parsable format */ 1786 if (!qflag) { 1787 t2 = tsub(t2, t1); 1788 print_report("discard", &t2, offset, bytes, bytes, 1, Cflag); 1789 } 1790 1791 return 0; 1792 } 1793 1794 static int alloc_f(BlockBackend *blk, int argc, char **argv) 1795 { 1796 BlockDriverState *bs = blk_bs(blk); 1797 int64_t offset, start, remaining, count; 1798 char s1[64]; 1799 int ret; 1800 int64_t num, sum_alloc; 1801 1802 start = offset = cvtnum(argv[1]); 1803 if (offset < 0) { 1804 print_cvtnum_err(offset, argv[1]); 1805 return offset; 1806 } 1807 1808 if (argc == 3) { 1809 count = cvtnum(argv[2]); 1810 if (count < 0) { 1811 print_cvtnum_err(count, argv[2]); 1812 return count; 1813 } 1814 } else { 1815 count = BDRV_SECTOR_SIZE; 1816 } 1817 1818 remaining = count; 1819 sum_alloc = 0; 1820 while (remaining) { 1821 ret = bdrv_is_allocated(bs, offset, remaining, &num); 1822 if (ret < 0) { 1823 printf("is_allocated failed: %s\n", strerror(-ret)); 1824 return ret; 1825 } 1826 offset += num; 1827 remaining -= num; 1828 if (ret) { 1829 sum_alloc += num; 1830 } 1831 if (num == 0) { 1832 count -= remaining; 1833 remaining = 0; 1834 } 1835 } 1836 1837 cvtstr(start, s1, sizeof(s1)); 1838 1839 printf("%"PRId64"/%"PRId64" bytes allocated at offset %s\n", 1840 sum_alloc, count, s1); 1841 return 0; 1842 } 1843 1844 static const cmdinfo_t alloc_cmd = { 1845 .name = "alloc", 1846 .altname = "a", 1847 .argmin = 1, 1848 .argmax = 2, 1849 .cfunc = alloc_f, 1850 .args = "offset [count]", 1851 .oneline = "checks if offset is allocated in the file", 1852 }; 1853 1854 1855 static int map_is_allocated(BlockDriverState *bs, int64_t offset, 1856 int64_t bytes, int64_t *pnum) 1857 { 1858 int64_t num; 1859 int num_checked; 1860 int ret, firstret; 1861 1862 num_checked = MIN(bytes, BDRV_REQUEST_MAX_BYTES); 1863 ret = bdrv_is_allocated(bs, offset, num_checked, &num); 1864 if (ret < 0) { 1865 return ret; 1866 } 1867 1868 firstret = ret; 1869 *pnum = num; 1870 1871 while (bytes > 0 && ret == firstret) { 1872 offset += num; 1873 bytes -= num; 1874 1875 num_checked = MIN(bytes, BDRV_REQUEST_MAX_BYTES); 1876 ret = bdrv_is_allocated(bs, offset, num_checked, &num); 1877 if (ret == firstret && num) { 1878 *pnum += num; 1879 } else { 1880 break; 1881 } 1882 } 1883 1884 return firstret; 1885 } 1886 1887 static int map_f(BlockBackend *blk, int argc, char **argv) 1888 { 1889 int64_t offset, bytes; 1890 char s1[64], s2[64]; 1891 int64_t num; 1892 int ret; 1893 const char *retstr; 1894 1895 offset = 0; 1896 bytes = blk_getlength(blk); 1897 if (bytes < 0) { 1898 error_report("Failed to query image length: %s", strerror(-bytes)); 1899 return bytes; 1900 } 1901 1902 while (bytes) { 1903 ret = map_is_allocated(blk_bs(blk), offset, bytes, &num); 1904 if (ret < 0) { 1905 error_report("Failed to get allocation status: %s", strerror(-ret)); 1906 return ret; 1907 } else if (!num) { 1908 error_report("Unexpected end of image"); 1909 return -EIO; 1910 } 1911 1912 retstr = ret ? " allocated" : "not allocated"; 1913 cvtstr(num, s1, sizeof(s1)); 1914 cvtstr(offset, s2, sizeof(s2)); 1915 printf("%s (0x%" PRIx64 ") bytes %s at offset %s (0x%" PRIx64 ")\n", 1916 s1, num, retstr, s2, offset); 1917 1918 offset += num; 1919 bytes -= num; 1920 } 1921 1922 return 0; 1923 } 1924 1925 static const cmdinfo_t map_cmd = { 1926 .name = "map", 1927 .argmin = 0, 1928 .argmax = 0, 1929 .cfunc = map_f, 1930 .args = "", 1931 .oneline = "prints the allocated areas of a file", 1932 }; 1933 1934 static void reopen_help(void) 1935 { 1936 printf( 1937 "\n" 1938 " Changes the open options of an already opened image\n" 1939 "\n" 1940 " Example:\n" 1941 " 'reopen -o lazy-refcounts=on' - activates lazy refcount writeback on a qcow2 image\n" 1942 "\n" 1943 " -r, -- Reopen the image read-only\n" 1944 " -w, -- Reopen the image read-write\n" 1945 " -c, -- Change the cache mode to the given value\n" 1946 " -o, -- Changes block driver options (cf. 'open' command)\n" 1947 "\n"); 1948 } 1949 1950 static int reopen_f(BlockBackend *blk, int argc, char **argv); 1951 1952 static QemuOptsList reopen_opts = { 1953 .name = "reopen", 1954 .merge_lists = true, 1955 .head = QTAILQ_HEAD_INITIALIZER(reopen_opts.head), 1956 .desc = { 1957 /* no elements => accept any params */ 1958 { /* end of list */ } 1959 }, 1960 }; 1961 1962 static const cmdinfo_t reopen_cmd = { 1963 .name = "reopen", 1964 .argmin = 0, 1965 .argmax = -1, 1966 .cfunc = reopen_f, 1967 .args = "[(-r|-w)] [-c cache] [-o options]", 1968 .oneline = "reopens an image with new options", 1969 .help = reopen_help, 1970 }; 1971 1972 static int reopen_f(BlockBackend *blk, int argc, char **argv) 1973 { 1974 BlockDriverState *bs = blk_bs(blk); 1975 QemuOpts *qopts; 1976 QDict *opts; 1977 int c; 1978 int flags = bs->open_flags; 1979 bool writethrough = !blk_enable_write_cache(blk); 1980 bool has_rw_option = false; 1981 1982 BlockReopenQueue *brq; 1983 Error *local_err = NULL; 1984 1985 while ((c = getopt(argc, argv, "c:o:rw")) != -1) { 1986 switch (c) { 1987 case 'c': 1988 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) < 0) { 1989 error_report("Invalid cache option: %s", optarg); 1990 return -EINVAL; 1991 } 1992 break; 1993 case 'o': 1994 if (!qemu_opts_parse_noisily(&reopen_opts, optarg, 0)) { 1995 qemu_opts_reset(&reopen_opts); 1996 return -EINVAL; 1997 } 1998 break; 1999 case 'r': 2000 if (has_rw_option) { 2001 error_report("Only one -r/-w option may be given"); 2002 return -EINVAL; 2003 } 2004 flags &= ~BDRV_O_RDWR; 2005 has_rw_option = true; 2006 break; 2007 case 'w': 2008 if (has_rw_option) { 2009 error_report("Only one -r/-w option may be given"); 2010 return -EINVAL; 2011 } 2012 flags |= BDRV_O_RDWR; 2013 has_rw_option = true; 2014 break; 2015 default: 2016 qemu_opts_reset(&reopen_opts); 2017 qemuio_command_usage(&reopen_cmd); 2018 return -EINVAL; 2019 } 2020 } 2021 2022 if (optind != argc) { 2023 qemu_opts_reset(&reopen_opts); 2024 qemuio_command_usage(&reopen_cmd); 2025 return -EINVAL; 2026 } 2027 2028 if (writethrough != blk_enable_write_cache(blk) && 2029 blk_get_attached_dev(blk)) 2030 { 2031 error_report("Cannot change cache.writeback: Device attached"); 2032 qemu_opts_reset(&reopen_opts); 2033 return -EBUSY; 2034 } 2035 2036 if (!(flags & BDRV_O_RDWR)) { 2037 uint64_t orig_perm, orig_shared_perm; 2038 2039 bdrv_drain(bs); 2040 2041 blk_get_perm(blk, &orig_perm, &orig_shared_perm); 2042 blk_set_perm(blk, 2043 orig_perm & ~(BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED), 2044 orig_shared_perm, 2045 &error_abort); 2046 } 2047 2048 qopts = qemu_opts_find(&reopen_opts, NULL); 2049 opts = qopts ? qemu_opts_to_qdict(qopts, NULL) : NULL; 2050 qemu_opts_reset(&reopen_opts); 2051 2052 bdrv_subtree_drained_begin(bs); 2053 brq = bdrv_reopen_queue(NULL, bs, opts, flags); 2054 bdrv_reopen_multiple(bdrv_get_aio_context(bs), brq, &local_err); 2055 bdrv_subtree_drained_end(bs); 2056 2057 if (local_err) { 2058 error_report_err(local_err); 2059 return -EINVAL; 2060 } 2061 2062 blk_set_enable_write_cache(blk, !writethrough); 2063 return 0; 2064 } 2065 2066 static int break_f(BlockBackend *blk, int argc, char **argv) 2067 { 2068 int ret; 2069 2070 ret = bdrv_debug_breakpoint(blk_bs(blk), argv[1], argv[2]); 2071 if (ret < 0) { 2072 printf("Could not set breakpoint: %s\n", strerror(-ret)); 2073 return ret; 2074 } 2075 2076 return 0; 2077 } 2078 2079 static int remove_break_f(BlockBackend *blk, int argc, char **argv) 2080 { 2081 int ret; 2082 2083 ret = bdrv_debug_remove_breakpoint(blk_bs(blk), argv[1]); 2084 if (ret < 0) { 2085 printf("Could not remove breakpoint %s: %s\n", argv[1], strerror(-ret)); 2086 return ret; 2087 } 2088 2089 return 0; 2090 } 2091 2092 static const cmdinfo_t break_cmd = { 2093 .name = "break", 2094 .argmin = 2, 2095 .argmax = 2, 2096 .cfunc = break_f, 2097 .args = "event tag", 2098 .oneline = "sets a breakpoint on event and tags the stopped " 2099 "request as tag", 2100 }; 2101 2102 static const cmdinfo_t remove_break_cmd = { 2103 .name = "remove_break", 2104 .argmin = 1, 2105 .argmax = 1, 2106 .cfunc = remove_break_f, 2107 .args = "tag", 2108 .oneline = "remove a breakpoint by tag", 2109 }; 2110 2111 static int resume_f(BlockBackend *blk, int argc, char **argv) 2112 { 2113 int ret; 2114 2115 ret = bdrv_debug_resume(blk_bs(blk), argv[1]); 2116 if (ret < 0) { 2117 printf("Could not resume request: %s\n", strerror(-ret)); 2118 return ret; 2119 } 2120 2121 return 0; 2122 } 2123 2124 static const cmdinfo_t resume_cmd = { 2125 .name = "resume", 2126 .argmin = 1, 2127 .argmax = 1, 2128 .cfunc = resume_f, 2129 .args = "tag", 2130 .oneline = "resumes the request tagged as tag", 2131 }; 2132 2133 static int wait_break_f(BlockBackend *blk, int argc, char **argv) 2134 { 2135 while (!bdrv_debug_is_suspended(blk_bs(blk), argv[1])) { 2136 aio_poll(blk_get_aio_context(blk), true); 2137 } 2138 return 0; 2139 } 2140 2141 static const cmdinfo_t wait_break_cmd = { 2142 .name = "wait_break", 2143 .argmin = 1, 2144 .argmax = 1, 2145 .cfunc = wait_break_f, 2146 .args = "tag", 2147 .oneline = "waits for the suspension of a request", 2148 }; 2149 2150 static int abort_f(BlockBackend *blk, int argc, char **argv) 2151 { 2152 abort(); 2153 } 2154 2155 static const cmdinfo_t abort_cmd = { 2156 .name = "abort", 2157 .cfunc = abort_f, 2158 .flags = CMD_NOFILE_OK, 2159 .oneline = "simulate a program crash using abort(3)", 2160 }; 2161 2162 static void sigraise_help(void) 2163 { 2164 printf( 2165 "\n" 2166 " raises the given signal\n" 2167 "\n" 2168 " Example:\n" 2169 " 'sigraise %i' - raises SIGTERM\n" 2170 "\n" 2171 " Invokes raise(signal), where \"signal\" is the mandatory integer argument\n" 2172 " given to sigraise.\n" 2173 "\n", SIGTERM); 2174 } 2175 2176 static int sigraise_f(BlockBackend *blk, int argc, char **argv); 2177 2178 static const cmdinfo_t sigraise_cmd = { 2179 .name = "sigraise", 2180 .cfunc = sigraise_f, 2181 .argmin = 1, 2182 .argmax = 1, 2183 .flags = CMD_NOFILE_OK, 2184 .args = "signal", 2185 .oneline = "raises a signal", 2186 .help = sigraise_help, 2187 }; 2188 2189 static int sigraise_f(BlockBackend *blk, int argc, char **argv) 2190 { 2191 int64_t sig = cvtnum(argv[1]); 2192 if (sig < 0) { 2193 print_cvtnum_err(sig, argv[1]); 2194 return sig; 2195 } else if (sig > NSIG) { 2196 printf("signal argument '%s' is too large to be a valid signal\n", 2197 argv[1]); 2198 return -EINVAL; 2199 } 2200 2201 /* Using raise() to kill this process does not necessarily flush all open 2202 * streams. At least stdout and stderr (although the latter should be 2203 * non-buffered anyway) should be flushed, though. */ 2204 fflush(stdout); 2205 fflush(stderr); 2206 2207 raise(sig); 2208 2209 return 0; 2210 } 2211 2212 static void sleep_cb(void *opaque) 2213 { 2214 bool *expired = opaque; 2215 *expired = true; 2216 } 2217 2218 static int sleep_f(BlockBackend *blk, int argc, char **argv) 2219 { 2220 char *endptr; 2221 long ms; 2222 struct QEMUTimer *timer; 2223 bool expired = false; 2224 2225 ms = strtol(argv[1], &endptr, 0); 2226 if (ms < 0 || *endptr != '\0') { 2227 printf("%s is not a valid number\n", argv[1]); 2228 return -EINVAL; 2229 } 2230 2231 timer = timer_new_ns(QEMU_CLOCK_HOST, sleep_cb, &expired); 2232 timer_mod(timer, qemu_clock_get_ns(QEMU_CLOCK_HOST) + SCALE_MS * ms); 2233 2234 while (!expired) { 2235 main_loop_wait(false); 2236 } 2237 2238 timer_free(timer); 2239 return 0; 2240 } 2241 2242 static const cmdinfo_t sleep_cmd = { 2243 .name = "sleep", 2244 .argmin = 1, 2245 .argmax = 1, 2246 .cfunc = sleep_f, 2247 .flags = CMD_NOFILE_OK, 2248 .oneline = "waits for the given value in milliseconds", 2249 }; 2250 2251 static void help_oneline(const char *cmd, const cmdinfo_t *ct) 2252 { 2253 if (cmd) { 2254 printf("%s ", cmd); 2255 } else { 2256 printf("%s ", ct->name); 2257 if (ct->altname) { 2258 printf("(or %s) ", ct->altname); 2259 } 2260 } 2261 2262 if (ct->args) { 2263 printf("%s ", ct->args); 2264 } 2265 printf("-- %s\n", ct->oneline); 2266 } 2267 2268 static void help_onecmd(const char *cmd, const cmdinfo_t *ct) 2269 { 2270 help_oneline(cmd, ct); 2271 if (ct->help) { 2272 ct->help(); 2273 } 2274 } 2275 2276 static void help_all(void) 2277 { 2278 const cmdinfo_t *ct; 2279 2280 for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++) { 2281 help_oneline(ct->name, ct); 2282 } 2283 printf("\nUse 'help commandname' for extended help.\n"); 2284 } 2285 2286 static int help_f(BlockBackend *blk, int argc, char **argv) 2287 { 2288 const cmdinfo_t *ct; 2289 2290 if (argc == 1) { 2291 help_all(); 2292 return 0; 2293 } 2294 2295 ct = find_command(argv[1]); 2296 if (ct == NULL) { 2297 printf("command %s not found\n", argv[1]); 2298 return -EINVAL; 2299 } 2300 2301 help_onecmd(argv[1], ct); 2302 return 0; 2303 } 2304 2305 static const cmdinfo_t help_cmd = { 2306 .name = "help", 2307 .altname = "?", 2308 .cfunc = help_f, 2309 .argmin = 0, 2310 .argmax = 1, 2311 .flags = CMD_FLAG_GLOBAL, 2312 .args = "[command]", 2313 .oneline = "help for one or all commands", 2314 }; 2315 2316 int qemuio_command(BlockBackend *blk, const char *cmd) 2317 { 2318 AioContext *ctx; 2319 char *input; 2320 const cmdinfo_t *ct; 2321 char **v; 2322 int c; 2323 int ret = 0; 2324 2325 input = g_strdup(cmd); 2326 v = breakline(input, &c); 2327 if (c) { 2328 ct = find_command(v[0]); 2329 if (ct) { 2330 ctx = blk ? blk_get_aio_context(blk) : qemu_get_aio_context(); 2331 aio_context_acquire(ctx); 2332 ret = command(blk, ct, c, v); 2333 aio_context_release(ctx); 2334 } else { 2335 fprintf(stderr, "command \"%s\" not found\n", v[0]); 2336 ret = -EINVAL; 2337 } 2338 } 2339 g_free(input); 2340 g_free(v); 2341 2342 return ret; 2343 } 2344 2345 static void __attribute((constructor)) init_qemuio_commands(void) 2346 { 2347 /* initialize commands */ 2348 qemuio_add_command(&help_cmd); 2349 qemuio_add_command(&read_cmd); 2350 qemuio_add_command(&readv_cmd); 2351 qemuio_add_command(&write_cmd); 2352 qemuio_add_command(&writev_cmd); 2353 qemuio_add_command(&aio_read_cmd); 2354 qemuio_add_command(&aio_write_cmd); 2355 qemuio_add_command(&aio_flush_cmd); 2356 qemuio_add_command(&flush_cmd); 2357 qemuio_add_command(&truncate_cmd); 2358 qemuio_add_command(&length_cmd); 2359 qemuio_add_command(&info_cmd); 2360 qemuio_add_command(&discard_cmd); 2361 qemuio_add_command(&alloc_cmd); 2362 qemuio_add_command(&map_cmd); 2363 qemuio_add_command(&reopen_cmd); 2364 qemuio_add_command(&break_cmd); 2365 qemuio_add_command(&remove_break_cmd); 2366 qemuio_add_command(&resume_cmd); 2367 qemuio_add_command(&wait_break_cmd); 2368 qemuio_add_command(&abort_cmd); 2369 qemuio_add_command(&sleep_cmd); 2370 qemuio_add_command(&sigraise_cmd); 2371 } 2372