qemu-io.c (18293B)
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 11#include "qemu/osdep.h" 12#include <getopt.h> 13#include <libgen.h> 14#ifndef _WIN32 15#include <termios.h> 16#endif 17 18#include "qemu-common.h" 19#include "qapi/error.h" 20#include "qemu-io.h" 21#include "qemu/error-report.h" 22#include "qemu/main-loop.h" 23#include "qemu/module.h" 24#include "qemu/option.h" 25#include "qemu/config-file.h" 26#include "qemu/readline.h" 27#include "qemu/log.h" 28#include "qemu/sockets.h" 29#include "qapi/qmp/qstring.h" 30#include "qapi/qmp/qdict.h" 31#include "qom/object_interfaces.h" 32#include "sysemu/block-backend.h" 33#include "block/block_int.h" 34#include "trace/control.h" 35#include "crypto/init.h" 36#include "qemu-version.h" 37 38#define CMD_NOFILE_OK 0x01 39 40static BlockBackend *qemuio_blk; 41static bool quit_qemu_io; 42 43/* qemu-io commands passed using -c */ 44static int ncmdline; 45static char **cmdline; 46static bool imageOpts; 47 48static ReadLineState *readline_state; 49 50static int ttyEOF; 51 52static int get_eof_char(void) 53{ 54#ifdef _WIN32 55 return 0x4; /* Ctrl-D */ 56#else 57 struct termios tty; 58 if (tcgetattr(STDIN_FILENO, &tty) != 0) { 59 if (errno == ENOTTY) { 60 return 0x0; /* just expect read() == 0 */ 61 } else { 62 return 0x4; /* Ctrl-D */ 63 } 64 } 65 66 return tty.c_cc[VEOF]; 67#endif 68} 69 70static int close_f(BlockBackend *blk, int argc, char **argv) 71{ 72 blk_unref(qemuio_blk); 73 qemuio_blk = NULL; 74 return 0; 75} 76 77static const cmdinfo_t close_cmd = { 78 .name = "close", 79 .altname = "c", 80 .cfunc = close_f, 81 .oneline = "close the current open file", 82}; 83 84static int openfile(char *name, int flags, bool writethrough, bool force_share, 85 QDict *opts) 86{ 87 Error *local_err = NULL; 88 89 if (qemuio_blk) { 90 error_report("file open already, try 'help close'"); 91 qobject_unref(opts); 92 return 1; 93 } 94 95 if (force_share) { 96 if (!opts) { 97 opts = qdict_new(); 98 } 99 if (qdict_haskey(opts, BDRV_OPT_FORCE_SHARE) 100 && strcmp(qdict_get_str(opts, BDRV_OPT_FORCE_SHARE), "on")) { 101 error_report("-U conflicts with image options"); 102 qobject_unref(opts); 103 return 1; 104 } 105 qdict_put_str(opts, BDRV_OPT_FORCE_SHARE, "on"); 106 } 107 qemuio_blk = blk_new_open(name, NULL, opts, flags, &local_err); 108 if (!qemuio_blk) { 109 error_reportf_err(local_err, "can't open%s%s: ", 110 name ? " device " : "", name ?: ""); 111 return 1; 112 } 113 114 blk_set_enable_write_cache(qemuio_blk, !writethrough); 115 116 return 0; 117} 118 119static void open_help(void) 120{ 121 printf( 122"\n" 123" opens a new file in the requested mode\n" 124"\n" 125" Example:\n" 126" 'open -n -o driver=raw /tmp/data' - opens raw data file read-write, uncached\n" 127"\n" 128" Opens a file for subsequent use by all of the other qemu-io commands.\n" 129" -r, -- open file read-only\n" 130" -s, -- use snapshot file\n" 131" -C, -- use copy-on-read\n" 132" -n, -- disable host cache, short for -t none\n" 133" -U, -- force shared permissions\n" 134" -k, -- use kernel AIO implementation (Linux only, prefer use of -i)\n" 135" -i, -- use AIO mode (threads, native or io_uring)\n" 136" -t, -- use the given cache mode for the image\n" 137" -d, -- use the given discard mode for the image\n" 138" -o, -- options to be given to the block driver" 139"\n"); 140} 141 142static int open_f(BlockBackend *blk, int argc, char **argv); 143 144static const cmdinfo_t open_cmd = { 145 .name = "open", 146 .altname = "o", 147 .cfunc = open_f, 148 .argmin = 1, 149 .argmax = -1, 150 .flags = CMD_NOFILE_OK, 151 .args = "[-rsCnkU] [-t cache] [-d discard] [-o options] [path]", 152 .oneline = "open the file specified by path", 153 .help = open_help, 154}; 155 156static QemuOptsList empty_opts = { 157 .name = "drive", 158 .merge_lists = true, 159 .head = QTAILQ_HEAD_INITIALIZER(empty_opts.head), 160 .desc = { 161 /* no elements => accept any params */ 162 { /* end of list */ } 163 }, 164}; 165 166static int open_f(BlockBackend *blk, int argc, char **argv) 167{ 168 int flags = BDRV_O_UNMAP; 169 int readonly = 0; 170 bool writethrough = true; 171 int c; 172 int ret; 173 QemuOpts *qopts; 174 QDict *opts; 175 bool force_share = false; 176 177 while ((c = getopt(argc, argv, "snCro:ki:t:d:U")) != -1) { 178 switch (c) { 179 case 's': 180 flags |= BDRV_O_SNAPSHOT; 181 break; 182 case 'n': 183 flags |= BDRV_O_NOCACHE; 184 writethrough = false; 185 break; 186 case 'C': 187 flags |= BDRV_O_COPY_ON_READ; 188 break; 189 case 'r': 190 readonly = 1; 191 break; 192 case 'k': 193 flags |= BDRV_O_NATIVE_AIO; 194 break; 195 case 't': 196 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) < 0) { 197 error_report("Invalid cache option: %s", optarg); 198 qemu_opts_reset(&empty_opts); 199 return -EINVAL; 200 } 201 break; 202 case 'd': 203 if (bdrv_parse_discard_flags(optarg, &flags) < 0) { 204 error_report("Invalid discard option: %s", optarg); 205 qemu_opts_reset(&empty_opts); 206 return -EINVAL; 207 } 208 break; 209 case 'i': 210 if (bdrv_parse_aio(optarg, &flags) < 0) { 211 error_report("Invalid aio option: %s", optarg); 212 qemu_opts_reset(&empty_opts); 213 return -EINVAL; 214 } 215 break; 216 case 'o': 217 if (imageOpts) { 218 printf("--image-opts and 'open -o' are mutually exclusive\n"); 219 qemu_opts_reset(&empty_opts); 220 return -EINVAL; 221 } 222 if (!qemu_opts_parse_noisily(&empty_opts, optarg, false)) { 223 qemu_opts_reset(&empty_opts); 224 return -EINVAL; 225 } 226 break; 227 case 'U': 228 force_share = true; 229 break; 230 default: 231 qemu_opts_reset(&empty_opts); 232 qemuio_command_usage(&open_cmd); 233 return -EINVAL; 234 } 235 } 236 237 if (!readonly) { 238 flags |= BDRV_O_RDWR; 239 } 240 241 if (imageOpts && (optind == argc - 1)) { 242 if (!qemu_opts_parse_noisily(&empty_opts, argv[optind], false)) { 243 qemu_opts_reset(&empty_opts); 244 return -EINVAL; 245 } 246 optind++; 247 } 248 249 qopts = qemu_opts_find(&empty_opts, NULL); 250 opts = qopts ? qemu_opts_to_qdict(qopts, NULL) : NULL; 251 qemu_opts_reset(&empty_opts); 252 253 if (optind == argc - 1) { 254 ret = openfile(argv[optind], flags, writethrough, force_share, opts); 255 } else if (optind == argc) { 256 ret = openfile(NULL, flags, writethrough, force_share, opts); 257 } else { 258 qobject_unref(opts); 259 qemuio_command_usage(&open_cmd); 260 return -EINVAL; 261 } 262 263 if (ret) { 264 return -EINVAL; 265 } 266 267 return 0; 268} 269 270static int quit_f(BlockBackend *blk, int argc, char **argv) 271{ 272 quit_qemu_io = true; 273 return 0; 274} 275 276static const cmdinfo_t quit_cmd = { 277 .name = "quit", 278 .altname = "q", 279 .cfunc = quit_f, 280 .argmin = -1, 281 .argmax = -1, 282 .flags = CMD_FLAG_GLOBAL, 283 .oneline = "exit the program", 284}; 285 286static void usage(const char *name) 287{ 288 printf( 289"Usage: %s [OPTIONS]... [-c STRING]... [file]\n" 290"QEMU Disk exerciser\n" 291"\n" 292" --object OBJECTDEF define an object such as 'secret' for\n" 293" passwords and/or encryption keys\n" 294" --image-opts treat file as option string\n" 295" -c, --cmd STRING execute command with its arguments\n" 296" from the given string\n" 297" -f, --format FMT specifies the block driver to use\n" 298" -r, --read-only export read-only\n" 299" -s, --snapshot use snapshot file\n" 300" -n, --nocache disable host cache, short for -t none\n" 301" -C, --copy-on-read enable copy-on-read\n" 302" -m, --misalign misalign allocations for O_DIRECT\n" 303" -k, --native-aio use kernel AIO implementation\n" 304" (Linux only, prefer use of -i)\n" 305" -i, --aio=MODE use AIO mode (threads, native or io_uring)\n" 306" -t, --cache=MODE use the given cache mode for the image\n" 307" -d, --discard=MODE use the given discard mode for the image\n" 308" -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 309" specify tracing options\n" 310" see qemu-img(1) man page for full description\n" 311" -U, --force-share force shared permissions\n" 312" -h, --help display this help and exit\n" 313" -V, --version output version information and exit\n" 314"\n" 315"See '%s -c help' for information on available commands.\n" 316"\n" 317QEMU_HELP_BOTTOM "\n", 318 name, name); 319} 320 321static char *get_prompt(void) 322{ 323 static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ]; 324 325 if (!prompt[0]) { 326 snprintf(prompt, sizeof(prompt), "%s> ", error_get_progname()); 327 } 328 329 return prompt; 330} 331 332static void GCC_FMT_ATTR(2, 3) readline_printf_func(void *opaque, 333 const char *fmt, ...) 334{ 335 va_list ap; 336 va_start(ap, fmt); 337 vprintf(fmt, ap); 338 va_end(ap); 339} 340 341static void readline_flush_func(void *opaque) 342{ 343 fflush(stdout); 344} 345 346static void readline_func(void *opaque, const char *str, void *readline_opaque) 347{ 348 char **line = readline_opaque; 349 *line = g_strdup(str); 350} 351 352static void completion_match(const char *cmd, void *opaque) 353{ 354 readline_add_completion(readline_state, cmd); 355} 356 357static void readline_completion_func(void *opaque, const char *str) 358{ 359 readline_set_completion_index(readline_state, strlen(str)); 360 qemuio_complete_command(str, completion_match, NULL); 361} 362 363static char *fetchline_readline(void) 364{ 365 char *line = NULL; 366 367 readline_start(readline_state, get_prompt(), 0, readline_func, &line); 368 while (!line) { 369 int ch = getchar(); 370 if (ttyEOF != 0x0 && ch == ttyEOF) { 371 printf("\n"); 372 break; 373 } 374 readline_handle_byte(readline_state, ch); 375 } 376 return line; 377} 378 379#define MAXREADLINESZ 1024 380static char *fetchline_fgets(void) 381{ 382 char *p, *line = g_malloc(MAXREADLINESZ); 383 384 if (!fgets(line, MAXREADLINESZ, stdin)) { 385 g_free(line); 386 return NULL; 387 } 388 389 p = line + strlen(line); 390 if (p != line && p[-1] == '\n') { 391 p[-1] = '\0'; 392 } 393 394 return line; 395} 396 397static char *fetchline(void) 398{ 399 if (readline_state) { 400 return fetchline_readline(); 401 } else { 402 return fetchline_fgets(); 403 } 404} 405 406static void prep_fetchline(void *opaque) 407{ 408 int *fetchable = opaque; 409 410 qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL); 411 *fetchable= 1; 412} 413 414static int do_qemuio_command(const char *cmd) 415{ 416 int ret; 417 AioContext *ctx = 418 qemuio_blk ? blk_get_aio_context(qemuio_blk) : qemu_get_aio_context(); 419 420 aio_context_acquire(ctx); 421 ret = qemuio_command(qemuio_blk, cmd); 422 aio_context_release(ctx); 423 424 return ret; 425} 426 427static int command_loop(void) 428{ 429 int i, fetchable = 0, prompted = 0; 430 int ret, last_error = 0; 431 char *input; 432 433 for (i = 0; !quit_qemu_io && i < ncmdline; i++) { 434 ret = do_qemuio_command(cmdline[i]); 435 if (ret < 0) { 436 last_error = ret; 437 } 438 } 439 if (cmdline) { 440 g_free(cmdline); 441 return last_error; 442 } 443 444 while (!quit_qemu_io) { 445 if (!prompted) { 446 printf("%s", get_prompt()); 447 fflush(stdout); 448 qemu_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, &fetchable); 449 prompted = 1; 450 } 451 452 main_loop_wait(false); 453 454 if (!fetchable) { 455 continue; 456 } 457 458 input = fetchline(); 459 if (input == NULL) { 460 break; 461 } 462 ret = do_qemuio_command(input); 463 g_free(input); 464 465 if (ret < 0) { 466 last_error = ret; 467 } 468 469 prompted = 0; 470 fetchable = 0; 471 } 472 qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL); 473 474 return last_error; 475} 476 477static void add_user_command(char *optarg) 478{ 479 cmdline = g_renew(char *, cmdline, ++ncmdline); 480 cmdline[ncmdline-1] = optarg; 481} 482 483static void reenable_tty_echo(void) 484{ 485 qemu_set_tty_echo(STDIN_FILENO, true); 486} 487 488enum { 489 OPTION_OBJECT = 256, 490 OPTION_IMAGE_OPTS = 257, 491}; 492 493static QemuOptsList file_opts = { 494 .name = "file", 495 .implied_opt_name = "file", 496 .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), 497 .desc = { 498 /* no elements => accept any params */ 499 { /* end of list */ } 500 }, 501}; 502 503int main(int argc, char **argv) 504{ 505 int readonly = 0; 506 const char *sopt = "hVc:d:f:rsnCmki:t:T:U"; 507 const struct option lopt[] = { 508 { "help", no_argument, NULL, 'h' }, 509 { "version", no_argument, NULL, 'V' }, 510 { "cmd", required_argument, NULL, 'c' }, 511 { "format", required_argument, NULL, 'f' }, 512 { "read-only", no_argument, NULL, 'r' }, 513 { "snapshot", no_argument, NULL, 's' }, 514 { "nocache", no_argument, NULL, 'n' }, 515 { "copy-on-read", no_argument, NULL, 'C' }, 516 { "misalign", no_argument, NULL, 'm' }, 517 { "native-aio", no_argument, NULL, 'k' }, 518 { "aio", required_argument, NULL, 'i' }, 519 { "discard", required_argument, NULL, 'd' }, 520 { "cache", required_argument, NULL, 't' }, 521 { "trace", required_argument, NULL, 'T' }, 522 { "object", required_argument, NULL, OPTION_OBJECT }, 523 { "image-opts", no_argument, NULL, OPTION_IMAGE_OPTS }, 524 { "force-share", no_argument, 0, 'U'}, 525 { NULL, 0, NULL, 0 } 526 }; 527 int c; 528 int opt_index = 0; 529 int flags = BDRV_O_UNMAP; 530 int ret; 531 bool writethrough = true; 532 QDict *opts = NULL; 533 const char *format = NULL; 534 bool force_share = false; 535 536#ifdef CONFIG_POSIX 537 signal(SIGPIPE, SIG_IGN); 538#endif 539 540 socket_init(); 541 error_init(argv[0]); 542 module_call_init(MODULE_INIT_TRACE); 543 qemu_init_exec_dir(argv[0]); 544 545 qcrypto_init(&error_fatal); 546 547 module_call_init(MODULE_INIT_QOM); 548 qemu_add_opts(&qemu_trace_opts); 549 bdrv_init(); 550 551 while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) { 552 switch (c) { 553 case 's': 554 flags |= BDRV_O_SNAPSHOT; 555 break; 556 case 'n': 557 flags |= BDRV_O_NOCACHE; 558 writethrough = false; 559 break; 560 case 'C': 561 flags |= BDRV_O_COPY_ON_READ; 562 break; 563 case 'd': 564 if (bdrv_parse_discard_flags(optarg, &flags) < 0) { 565 error_report("Invalid discard option: %s", optarg); 566 exit(1); 567 } 568 break; 569 case 'f': 570 format = optarg; 571 break; 572 case 'c': 573 add_user_command(optarg); 574 break; 575 case 'r': 576 readonly = 1; 577 break; 578 case 'm': 579 qemuio_misalign = true; 580 break; 581 case 'k': 582 flags |= BDRV_O_NATIVE_AIO; 583 break; 584 case 'i': 585 if (bdrv_parse_aio(optarg, &flags) < 0) { 586 error_report("Invalid aio option: %s", optarg); 587 exit(1); 588 } 589 break; 590 case 't': 591 if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) < 0) { 592 error_report("Invalid cache option: %s", optarg); 593 exit(1); 594 } 595 break; 596 case 'T': 597 trace_opt_parse(optarg); 598 break; 599 case 'V': 600 printf("%s version " QEMU_FULL_VERSION "\n" 601 QEMU_COPYRIGHT "\n", error_get_progname()); 602 exit(0); 603 case 'h': 604 usage(error_get_progname()); 605 exit(0); 606 case 'U': 607 force_share = true; 608 break; 609 case OPTION_OBJECT: 610 user_creatable_process_cmdline(optarg); 611 break; 612 case OPTION_IMAGE_OPTS: 613 imageOpts = true; 614 break; 615 default: 616 usage(error_get_progname()); 617 exit(1); 618 } 619 } 620 621 if ((argc - optind) > 1) { 622 usage(error_get_progname()); 623 exit(1); 624 } 625 626 if (format && imageOpts) { 627 error_report("--image-opts and -f are mutually exclusive"); 628 exit(1); 629 } 630 631 qemu_init_main_loop(&error_fatal); 632 633 if (!trace_init_backends()) { 634 exit(1); 635 } 636 trace_init_file(); 637 qemu_set_log(LOG_TRACE); 638 639 /* initialize commands */ 640 qemuio_add_command(&quit_cmd); 641 qemuio_add_command(&open_cmd); 642 qemuio_add_command(&close_cmd); 643 644 if (isatty(STDIN_FILENO)) { 645 ttyEOF = get_eof_char(); 646 readline_state = readline_init(readline_printf_func, 647 readline_flush_func, 648 NULL, 649 readline_completion_func); 650 qemu_set_tty_echo(STDIN_FILENO, false); 651 atexit(reenable_tty_echo); 652 } 653 654 /* open the device */ 655 if (!readonly) { 656 flags |= BDRV_O_RDWR; 657 } 658 659 if ((argc - optind) == 1) { 660 if (imageOpts) { 661 QemuOpts *qopts = NULL; 662 qopts = qemu_opts_parse_noisily(&file_opts, argv[optind], false); 663 if (!qopts) { 664 exit(1); 665 } 666 opts = qemu_opts_to_qdict(qopts, NULL); 667 if (openfile(NULL, flags, writethrough, force_share, opts)) { 668 exit(1); 669 } 670 } else { 671 if (format) { 672 opts = qdict_new(); 673 qdict_put_str(opts, "driver", format); 674 } 675 if (openfile(argv[optind], flags, writethrough, 676 force_share, opts)) { 677 exit(1); 678 } 679 } 680 } 681 ret = command_loop(); 682 683 /* 684 * Make sure all outstanding requests complete before the program exits. 685 */ 686 bdrv_drain_all(); 687 688 blk_unref(qemuio_blk); 689 g_free(readline_state); 690 691 if (ret < 0) { 692 return 1; 693 } else { 694 return 0; 695 } 696}