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