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