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/time.h>
  11 #include <sys/types.h>
  12 #include <stdarg.h>
  13 #include <stdio.h>
  14 #include <getopt.h>
  15 #include <libgen.h>
  16
  17 #include "qemu-io.h"
  18 #include "qemu/main-loop.h"
  19 #include "qemu/option.h"
  20 #include "qemu/config-file.h"
  21 #include "qemu/readline.h"
  22 #include "sysemu/block-backend.h"
  23 #include "block/block_int.h"
  24 #include "trace/control.h"
  25
  26 #define CMD_NOFILE_OK   0x01
  27
  28 static char *progname;
  29
  30 static BlockBackend *qemuio_blk;
  31 static BlockDriverState *qemuio_bs;
  32
  33 /* qemu-io commands passed using -c */
  34 static int ncmdline;
  35 static char **cmdline;
  36
  37 static ReadLineState *readline_state;
  38
  39 static int close_f(BlockDriverState *bs, int argc, char **argv)
  40 {
  41     blk_unref(qemuio_blk);
  42     qemuio_bs = NULL;
  43     qemuio_blk = NULL;
  44     return 0;
  45 }
  46
  47 static const cmdinfo_t close_cmd = {
  48     .name       = "close",
  49     .altname    = "c",
  50     .cfunc      = close_f,
  51     .oneline    = "close the current open file",
  52 };
  53
  54 static int openfile(char *name, BlockDriver *drv, int flags, int growable,
  55                     QDict *opts)
  56 {
  57     Error *local_err = NULL;
  58
  59     if (qemuio_bs) {
  60         fprintf(stderr, "file open already, try 'help close'\n");
  61         QDECREF(opts);
  62         return 1;
  63     }
  64
  65     qemuio_blk = blk_new_with_bs("hda", &error_abort);
  66     qemuio_bs = blk_bs(qemuio_blk);
  67
  68     if (growable) {
  69         flags |= BDRV_O_PROTOCOL;
  70     }
  71
  72     if (bdrv_open(&qemuio_bs, name, NULL, opts, flags, drv, &local_err) < 0) {
  73         fprintf(stderr, "%s: can't open%s%s: %s\n", progname,
  74                 name ? " device " : "", name ?: "",
  75                 error_get_pretty(local_err));
  76         error_free(local_err);
  77         blk_unref(qemuio_blk);
  78         qemuio_bs = NULL;
  79         qemuio_blk = NULL;
  80         return 1;
  81     }
  82
  83     return 0;
  84 }
  85
  86 static void open_help(void)
  87 {
  88     printf(
  89 "\n"
  90 " opens a new file in the requested mode\n"
  91 "\n"
  92 " Example:\n"
  93 " 'open -Cn /tmp/data' - creates/opens data file read-write and uncached\n"
  94 "\n"
  95 " Opens a file for subsequent use by all of the other qemu-io commands.\n"
  96 " -r, -- open file read-only\n"
  97 " -s, -- use snapshot file\n"
  98 " -n, -- disable host cache\n"
  99 " -g, -- allow file to grow (only applies to protocols)\n"
 100 " -o, -- options to be given to the block driver"
 101 "\n");
 102 }
 103
 104 static int open_f(BlockDriverState *bs, int argc, char **argv);
 105
 106 static const cmdinfo_t open_cmd = {
 107     .name       = "open",
 108     .altname    = "o",
 109     .cfunc      = open_f,
 110     .argmin     = 1,
 111     .argmax     = -1,
 112     .flags      = CMD_NOFILE_OK,
 113     .args       = "[-Crsn] [-o options] [path]",
 114     .oneline    = "open the file specified by path",
 115     .help       = open_help,
 116 };
 117
 118 static QemuOptsList empty_opts = {
 119     .name = "drive",
 120     .merge_lists = true,
 121     .head = QTAILQ_HEAD_INITIALIZER(empty_opts.head),
 122     .desc = {
 123         /* no elements => accept any params */
 124         { /* end of list */ }
 125     },
 126 };
 127
 128 static int open_f(BlockDriverState *bs, int argc, char **argv)
 129 {
 130     int flags = 0;
 131     int readonly = 0;
 132     int growable = 0;
 133     int c;
 134     QemuOpts *qopts;
 135     QDict *opts;
 136
 137     while ((c = getopt(argc, argv, "snrgo:")) != EOF) {
 138         switch (c) {
 139         case 's':
 140             flags |= BDRV_O_SNAPSHOT;
 141             break;
 142         case 'n':
 143             flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
 144             break;
 145         case 'r':
 146             readonly = 1;
 147             break;
 148         case 'g':
 149             growable = 1;
 150             break;
 151         case 'o':
 152             if (!qemu_opts_parse(&empty_opts, optarg, 0)) {
 153                 printf("could not parse option list -- %s\n", optarg);
 154                 qemu_opts_reset(&empty_opts);
 155                 return 0;
 156             }
 157             break;
 158         default:
 159             qemu_opts_reset(&empty_opts);
 160             return qemuio_command_usage(&open_cmd);
 161         }
 162     }
 163
 164     if (!readonly) {
 165         flags |= BDRV_O_RDWR;
 166     }
 167
 168     qopts = qemu_opts_find(&empty_opts, NULL);
 169     opts = qopts ? qemu_opts_to_qdict(qopts, NULL) : NULL;
 170     qemu_opts_reset(&empty_opts);
 171
 172     if (optind == argc - 1) {
 173         return openfile(argv[optind], NULL, flags, growable, opts);
 174     } else if (optind == argc) {
 175         return openfile(NULL, NULL, flags, growable, opts);
 176     } else {
 177         QDECREF(opts);
 178         return qemuio_command_usage(&open_cmd);
 179     }
 180 }
 181
 182 static int quit_f(BlockDriverState *bs, int argc, char **argv)
 183 {
 184     return 1;
 185 }
 186
 187 static const cmdinfo_t quit_cmd = {
 188     .name       = "quit",
 189     .altname    = "q",
 190     .cfunc      = quit_f,
 191     .argmin     = -1,
 192     .argmax     = -1,
 193     .flags      = CMD_FLAG_GLOBAL,
 194     .oneline    = "exit the program",
 195 };
 196
 197 static void usage(const char *name)
 198 {
 199     printf(
 200 "Usage: %s [-h] [-V] [-rsnm] [-f FMT] [-c STRING] ... [file]\n"
 201 "QEMU Disk exerciser\n"
 202 "\n"
 203 "  -c, --cmd STRING     execute command with its arguments\n"
 204 "                       from the given string\n"
 205 "  -f, --format FMT     specifies the block driver to use\n"
 206 "  -r, --read-only      export read-only\n"
 207 "  -s, --snapshot       use snapshot file\n"
 208 "  -n, --nocache        disable host cache\n"
 209 "  -g, --growable       allow file to grow (only applies to protocols)\n"
 210 "  -m, --misalign       misalign allocations for O_DIRECT\n"
 211 "  -k, --native-aio     use kernel AIO implementation (on Linux only)\n"
 212 "  -t, --cache=MODE     use the given cache mode for the image\n"
 213 "  -T, --trace FILE     enable trace events listed in the given file\n"
 214 "  -h, --help           display this help and exit\n"
 215 "  -V, --version        output version information and exit\n"
 216 "\n"
 217 "See '%s -c help' for information on available commands."
 218 "\n",
 219     name, name);
 220 }
 221
 222 static char *get_prompt(void)
 223 {
 224     static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];
 225
 226     if (!prompt[0]) {
 227         snprintf(prompt, sizeof(prompt), "%s> ", progname);
 228     }
 229
 230     return prompt;
 231 }
 232
 233 static void GCC_FMT_ATTR(2, 3) readline_printf_func(void *opaque,
 234                                                     const char *fmt, ...)
 235 {
 236     va_list ap;
 237     va_start(ap, fmt);
 238     vprintf(fmt, ap);
 239     va_end(ap);
 240 }
 241
 242 static void readline_flush_func(void *opaque)
 243 {
 244     fflush(stdout);
 245 }
 246
 247 static void readline_func(void *opaque, const char *str, void *readline_opaque)
 248 {
 249     char **line = readline_opaque;
 250     *line = g_strdup(str);
 251 }
 252
 253 static void completion_match(const char *cmd, void *opaque)
 254 {
 255     readline_add_completion(readline_state, cmd);
 256 }
 257
 258 static void readline_completion_func(void *opaque, const char *str)
 259 {
 260     readline_set_completion_index(readline_state, strlen(str));
 261     qemuio_complete_command(str, completion_match, NULL);
 262 }
 263
 264 static char *fetchline_readline(void)
 265 {
 266     char *line = NULL;
 267
 268     readline_start(readline_state, get_prompt(), 0, readline_func, &line);
 269     while (!line) {
 270         int ch = getchar();
 271         if (ch == EOF) {
 272             break;
 273         }
 274         readline_handle_byte(readline_state, ch);
 275     }
 276     return line;
 277 }
 278
 279 #define MAXREADLINESZ 1024
 280 static char *fetchline_fgets(void)
 281 {
 282     char *p, *line = g_malloc(MAXREADLINESZ);
 283
 284     if (!fgets(line, MAXREADLINESZ, stdin)) {
 285         g_free(line);
 286         return NULL;
 287     }
 288
 289     p = line + strlen(line);
 290     if (p != line && p[-1] == '\n') {
 291         p[-1] = '\0';
 292     }
 293
 294     return line;
 295 }
 296
 297 static char *fetchline(void)
 298 {
 299     if (readline_state) {
 300         return fetchline_readline();
 301     } else {
 302         return fetchline_fgets();
 303     }
 304 }
 305
 306 static void prep_fetchline(void *opaque)
 307 {
 308     int *fetchable = opaque;
 309
 310     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 311     *fetchable= 1;
 312 }
 313
 314 static void command_loop(void)
 315 {
 316     int i, done = 0, fetchable = 0, prompted = 0;
 317     char *input;
 318
 319     for (i = 0; !done && i < ncmdline; i++) {
 320         done = qemuio_command(qemuio_bs, cmdline[i]);
 321     }
 322     if (cmdline) {
 323         g_free(cmdline);
 324         return;
 325     }
 326
 327     while (!done) {
 328         if (!prompted) {
 329             printf("%s", get_prompt());
 330             fflush(stdout);
 331             qemu_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, &fetchable);
 332             prompted = 1;
 333         }
 334
 335         main_loop_wait(false);
 336
 337         if (!fetchable) {
 338             continue;
 339         }
 340
 341         input = fetchline();
 342         if (input == NULL) {
 343             break;
 344         }
 345         done = qemuio_command(qemuio_bs, input);
 346         g_free(input);
 347
 348         prompted = 0;
 349         fetchable = 0;
 350     }
 351     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 352 }
 353
 354 static void add_user_command(char *optarg)
 355 {
 356     cmdline = g_renew(char *, cmdline, ++ncmdline);
 357     cmdline[ncmdline-1] = optarg;
 358 }
 359
 360 static void reenable_tty_echo(void)
 361 {
 362     qemu_set_tty_echo(STDIN_FILENO, true);
 363 }
 364
 365 int main(int argc, char **argv)
 366 {
 367     int readonly = 0;
 368     int growable = 0;
 369     const char *sopt = "hVc:d:f:rsnmgkt:T:";
 370     const struct option lopt[] = {
 371         { "help", 0, NULL, 'h' },
 372         { "version", 0, NULL, 'V' },
 373         { "offset", 1, NULL, 'o' },
 374         { "cmd", 1, NULL, 'c' },
 375         { "format", 1, NULL, 'f' },
 376         { "read-only", 0, NULL, 'r' },
 377         { "snapshot", 0, NULL, 's' },
 378         { "nocache", 0, NULL, 'n' },
 379         { "misalign", 0, NULL, 'm' },
 380         { "growable", 0, NULL, 'g' },
 381         { "native-aio", 0, NULL, 'k' },
 382         { "discard", 1, NULL, 'd' },
 383         { "cache", 1, NULL, 't' },
 384         { "trace", 1, NULL, 'T' },
 385         { NULL, 0, NULL, 0 }
 386     };
 387     int c;
 388     int opt_index = 0;
 389     int flags = BDRV_O_UNMAP;
 390     BlockDriver *drv = NULL;
 391     Error *local_error = NULL;
 392
 393 #ifdef CONFIG_POSIX
 394     signal(SIGPIPE, SIG_IGN);
 395 #endif
 396
 397     progname = basename(argv[0]);
 398     qemu_init_exec_dir(argv[0]);
 399
 400     bdrv_init();
 401
 402     while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
 403         switch (c) {
 404         case 's':
 405             flags |= BDRV_O_SNAPSHOT;
 406             break;
 407         case 'n':
 408             flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
 409             break;
 410         case 'd':
 411             if (bdrv_parse_discard_flags(optarg, &flags) < 0) {
 412                 error_report("Invalid discard option: %s", optarg);
 413                 exit(1);
 414             }
 415             break;
 416         case 'f':
 417             drv = bdrv_find_format(optarg);
 418             if (!drv) {
 419                 error_report("Invalid format '%s'", optarg);
 420                 exit(EXIT_FAILURE);
 421             }
 422             break;
 423         case 'c':
 424             add_user_command(optarg);
 425             break;
 426         case 'r':
 427             readonly = 1;
 428             break;
 429         case 'm':
 430             qemuio_misalign = true;
 431             break;
 432         case 'g':
 433             growable = 1;
 434             break;
 435         case 'k':
 436             flags |= BDRV_O_NATIVE_AIO;
 437             break;
 438         case 't':
 439             if (bdrv_parse_cache_flags(optarg, &flags) < 0) {
 440                 error_report("Invalid cache option: %s", optarg);
 441                 exit(1);
 442             }
 443             break;
 444         case 'T':
 445             if (!trace_init_backends(optarg, NULL)) {
 446                 exit(1); /* error message will have been printed */
 447             }
 448             break;
 449         case 'V':
 450             printf("%s version %s\n", progname, QEMU_VERSION);
 451             exit(0);
 452         case 'h':
 453             usage(progname);
 454             exit(0);
 455         default:
 456             usage(progname);
 457             exit(1);
 458         }
 459     }
 460
 461     if ((argc - optind) > 1) {
 462         usage(progname);
 463         exit(1);
 464     }
 465
 466     if (qemu_init_main_loop(&local_error)) {
 467         error_report("%s", error_get_pretty(local_error));
 468         error_free(local_error);
 469         exit(1);
 470     }
 471
 472     /* initialize commands */
 473     qemuio_add_command(&quit_cmd);
 474     qemuio_add_command(&open_cmd);
 475     qemuio_add_command(&close_cmd);
 476
 477     if (isatty(STDIN_FILENO)) {
 478         readline_state = readline_init(readline_printf_func,
 479                                        readline_flush_func,
 480                                        NULL,
 481                                        readline_completion_func);
 482         qemu_set_tty_echo(STDIN_FILENO, false);
 483         atexit(reenable_tty_echo);
 484     }
 485
 486     /* open the device */
 487     if (!readonly) {
 488         flags |= BDRV_O_RDWR;
 489     }
 490
 491     if ((argc - optind) == 1) {
 492         openfile(argv[optind], drv, flags, growable, NULL);
 493     }
 494     command_loop();
 495
 496     /*
 497      * Make sure all outstanding requests complete before the program exits.
 498      */
 499     bdrv_drain_all();
 500
 501     blk_unref(qemuio_blk);
 502     g_free(readline_state);
 503     return 0;
 504 }