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