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 STRING] ... [file]\n"
 197 "QEMU Disk exerciser\n"
 198 "\n"
 199 "  -c, --cmd STRING     execute command with its arguments\n"
 200 "                       from the given string\n"
 201 "  -r, --read-only      export read-only\n"
 202 "  -s, --snapshot       use snapshot file\n"
 203 "  -n, --nocache        disable host cache\n"
 204 "  -g, --growable       allow file to grow (only applies to protocols)\n"
 205 "  -m, --misalign       misalign allocations for O_DIRECT\n"
 206 "  -k, --native-aio     use kernel AIO implementation (on Linux only)\n"
 207 "  -t, --cache=MODE     use the given cache mode for the image\n"
 208 "  -T, --trace FILE     enable trace events listed in the given file\n"
 209 "  -h, --help           display this help and exit\n"
 210 "  -V, --version        output version information and exit\n"
 211 "\n"
 212 "See '%s -c help' for information on available commands."
 213 "\n",
 214     name, name);
 215 }
 216
 217 static char *get_prompt(void)
 218 {
 219     static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];
 220
 221     if (!prompt[0]) {
 222         snprintf(prompt, sizeof(prompt), "%s> ", progname);
 223     }
 224
 225     return prompt;
 226 }
 227
 228 static void GCC_FMT_ATTR(2, 3) readline_printf_func(void *opaque,
 229                                                     const char *fmt, ...)
 230 {
 231     va_list ap;
 232     va_start(ap, fmt);
 233     vprintf(fmt, ap);
 234     va_end(ap);
 235 }
 236
 237 static void readline_flush_func(void *opaque)
 238 {
 239     fflush(stdout);
 240 }
 241
 242 static void readline_func(void *opaque, const char *str, void *readline_opaque)
 243 {
 244     char **line = readline_opaque;
 245     *line = g_strdup(str);
 246 }
 247
 248 static void completion_match(const char *cmd, void *opaque)
 249 {
 250     readline_add_completion(readline_state, cmd);
 251 }
 252
 253 static void readline_completion_func(void *opaque, const char *str)
 254 {
 255     readline_set_completion_index(readline_state, strlen(str));
 256     qemuio_complete_command(str, completion_match, NULL);
 257 }
 258
 259 static char *fetchline_readline(void)
 260 {
 261     char *line = NULL;
 262
 263     readline_start(readline_state, get_prompt(), 0, readline_func, &line);
 264     while (!line) {
 265         int ch = getchar();
 266         if (ch == EOF) {
 267             break;
 268         }
 269         readline_handle_byte(readline_state, ch);
 270     }
 271     return line;
 272 }
 273
 274 #define MAXREADLINESZ 1024
 275 static char *fetchline_fgets(void)
 276 {
 277     char *p, *line = g_malloc(MAXREADLINESZ);
 278
 279     if (!fgets(line, MAXREADLINESZ, stdin)) {
 280         g_free(line);
 281         return NULL;
 282     }
 283
 284     p = line + strlen(line);
 285     if (p != line && p[-1] == '\n') {
 286         p[-1] = '\0';
 287     }
 288
 289     return line;
 290 }
 291
 292 static char *fetchline(void)
 293 {
 294     if (readline_state) {
 295         return fetchline_readline();
 296     } else {
 297         return fetchline_fgets();
 298     }
 299 }
 300
 301 static void prep_fetchline(void *opaque)
 302 {
 303     int *fetchable = opaque;
 304
 305     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 306     *fetchable= 1;
 307 }
 308
 309 static void command_loop(void)
 310 {
 311     int i, done = 0, fetchable = 0, prompted = 0;
 312     char *input;
 313
 314     for (i = 0; !done && i < ncmdline; i++) {
 315         done = qemuio_command(qemuio_bs, cmdline[i]);
 316     }
 317     if (cmdline) {
 318         g_free(cmdline);
 319         return;
 320     }
 321
 322     while (!done) {
 323         if (!prompted) {
 324             printf("%s", get_prompt());
 325             fflush(stdout);
 326             qemu_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, &fetchable);
 327             prompted = 1;
 328         }
 329
 330         main_loop_wait(false);
 331
 332         if (!fetchable) {
 333             continue;
 334         }
 335
 336         input = fetchline();
 337         if (input == NULL) {
 338             break;
 339         }
 340         done = qemuio_command(qemuio_bs, input);
 341         g_free(input);
 342
 343         prompted = 0;
 344         fetchable = 0;
 345     }
 346     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 347 }
 348
 349 static void add_user_command(char *optarg)
 350 {
 351     cmdline = g_realloc(cmdline, ++ncmdline * sizeof(char *));
 352     cmdline[ncmdline-1] = optarg;
 353 }
 354
 355 static void reenable_tty_echo(void)
 356 {
 357     qemu_set_tty_echo(STDIN_FILENO, true);
 358 }
 359
 360 int main(int argc, char **argv)
 361 {
 362     int readonly = 0;
 363     int growable = 0;
 364     const char *sopt = "hVc:d:rsnmgkt:T:";
 365     const struct option lopt[] = {
 366         { "help", 0, NULL, 'h' },
 367         { "version", 0, NULL, 'V' },
 368         { "offset", 1, NULL, 'o' },
 369         { "cmd", 1, NULL, 'c' },
 370         { "read-only", 0, NULL, 'r' },
 371         { "snapshot", 0, NULL, 's' },
 372         { "nocache", 0, NULL, 'n' },
 373         { "misalign", 0, NULL, 'm' },
 374         { "growable", 0, NULL, 'g' },
 375         { "native-aio", 0, NULL, 'k' },
 376         { "discard", 1, NULL, 'd' },
 377         { "cache", 1, NULL, 't' },
 378         { "trace", 1, NULL, 'T' },
 379         { NULL, 0, NULL, 0 }
 380     };
 381     int c;
 382     int opt_index = 0;
 383     int flags = BDRV_O_UNMAP;
 384
 385 #ifdef CONFIG_POSIX
 386     signal(SIGPIPE, SIG_IGN);
 387 #endif
 388
 389     progname = basename(argv[0]);
 390     qemu_init_exec_dir(argv[0]);
 391
 392     while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
 393         switch (c) {
 394         case 's':
 395             flags |= BDRV_O_SNAPSHOT;
 396             break;
 397         case 'n':
 398             flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
 399             break;
 400         case 'd':
 401             if (bdrv_parse_discard_flags(optarg, &flags) < 0) {
 402                 error_report("Invalid discard option: %s", optarg);
 403                 exit(1);
 404             }
 405             break;
 406         case 'c':
 407             add_user_command(optarg);
 408             break;
 409         case 'r':
 410             readonly = 1;
 411             break;
 412         case 'm':
 413             qemuio_misalign = true;
 414             break;
 415         case 'g':
 416             growable = 1;
 417             break;
 418         case 'k':
 419             flags |= BDRV_O_NATIVE_AIO;
 420             break;
 421         case 't':
 422             if (bdrv_parse_cache_flags(optarg, &flags) < 0) {
 423                 error_report("Invalid cache option: %s", optarg);
 424                 exit(1);
 425             }
 426             break;
 427         case 'T':
 428             if (!trace_backend_init(optarg, NULL)) {
 429                 exit(1); /* error message will have been printed */
 430             }
 431             break;
 432         case 'V':
 433             printf("%s version %s\n", progname, QEMU_VERSION);
 434             exit(0);
 435         case 'h':
 436             usage(progname);
 437             exit(0);
 438         default:
 439             usage(progname);
 440             exit(1);
 441         }
 442     }
 443
 444     if ((argc - optind) > 1) {
 445         usage(progname);
 446         exit(1);
 447     }
 448
 449     qemu_init_main_loop();
 450     bdrv_init();
 451
 452     /* initialize commands */
 453     qemuio_add_command(&quit_cmd);
 454     qemuio_add_command(&open_cmd);
 455     qemuio_add_command(&close_cmd);
 456
 457     if (isatty(STDIN_FILENO)) {
 458         readline_state = readline_init(readline_printf_func,
 459                                        readline_flush_func,
 460                                        NULL,
 461                                        readline_completion_func);
 462         qemu_set_tty_echo(STDIN_FILENO, false);
 463         atexit(reenable_tty_echo);
 464     }
 465
 466     /* open the device */
 467     if (!readonly) {
 468         flags |= BDRV_O_RDWR;
 469     }
 470
 471     if ((argc - optind) == 1) {
 472         openfile(argv[optind], flags, growable, NULL);
 473     }
 474     command_loop();
 475
 476     /*
 477      * Make sure all outstanding requests complete before the program exits.
 478      */
 479     bdrv_drain_all();
 480
 481     if (qemuio_bs) {
 482         bdrv_unref(qemuio_bs);
 483     }
 484     g_free(readline_state);
 485     return 0;
 486 }