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     qemuio_bs = bdrv_new("hda", &error_abort);
  62
  63     if (growable) {
  64         flags |= BDRV_O_PROTOCOL;
  65     }
  66
  67     if (bdrv_open(&qemuio_bs, name, NULL, opts, flags, NULL, &local_err) < 0) {
  68         fprintf(stderr, "%s: can't open%s%s: %s\n", progname,
  69                 name ? " device " : "", name ?: "",
  70                 error_get_pretty(local_err));
  71         error_free(local_err);
  72         bdrv_unref(qemuio_bs);
  73         qemuio_bs = NULL;
  74         return 1;
  75     }
  76
  77     return 0;
  78 }
  79
  80 static void open_help(void)
  81 {
  82     printf(
  83 "\n"
  84 " opens a new file in the requested mode\n"
  85 "\n"
  86 " Example:\n"
  87 " 'open -Cn /tmp/data' - creates/opens data file read-write and uncached\n"
  88 "\n"
  89 " Opens a file for subsequent use by all of the other qemu-io commands.\n"
  90 " -r, -- open file read-only\n"
  91 " -s, -- use snapshot file\n"
  92 " -n, -- disable host cache\n"
  93 " -g, -- allow file to grow (only applies to protocols)\n"
  94 " -o, -- options to be given to the block driver"
  95 "\n");
  96 }
  97
  98 static int open_f(BlockDriverState *bs, int argc, char **argv);
  99
 100 static const cmdinfo_t open_cmd = {
 101     .name       = "open",
 102     .altname    = "o",
 103     .cfunc      = open_f,
 104     .argmin     = 1,
 105     .argmax     = -1,
 106     .flags      = CMD_NOFILE_OK,
 107     .args       = "[-Crsn] [-o options] [path]",
 108     .oneline    = "open the file specified by path",
 109     .help       = open_help,
 110 };
 111
 112 static QemuOptsList empty_opts = {
 113     .name = "drive",
 114     .merge_lists = true,
 115     .head = QTAILQ_HEAD_INITIALIZER(empty_opts.head),
 116     .desc = {
 117         /* no elements => accept any params */
 118         { /* end of list */ }
 119     },
 120 };
 121
 122 static int open_f(BlockDriverState *bs, int argc, char **argv)
 123 {
 124     int flags = 0;
 125     int readonly = 0;
 126     int growable = 0;
 127     int c;
 128     QemuOpts *qopts;
 129     QDict *opts;
 130
 131     while ((c = getopt(argc, argv, "snrgo:")) != EOF) {
 132         switch (c) {
 133         case 's':
 134             flags |= BDRV_O_SNAPSHOT;
 135             break;
 136         case 'n':
 137             flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
 138             break;
 139         case 'r':
 140             readonly = 1;
 141             break;
 142         case 'g':
 143             growable = 1;
 144             break;
 145         case 'o':
 146             if (!qemu_opts_parse(&empty_opts, optarg, 0)) {
 147                 printf("could not parse option list -- %s\n", optarg);
 148                 qemu_opts_reset(&empty_opts);
 149                 return 0;
 150             }
 151             break;
 152         default:
 153             qemu_opts_reset(&empty_opts);
 154             return qemuio_command_usage(&open_cmd);
 155         }
 156     }
 157
 158     if (!readonly) {
 159         flags |= BDRV_O_RDWR;
 160     }
 161
 162     qopts = qemu_opts_find(&empty_opts, NULL);
 163     opts = qopts ? qemu_opts_to_qdict(qopts, NULL) : NULL;
 164     qemu_opts_reset(&empty_opts);
 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         QDECREF(opts);
 172         return qemuio_command_usage(&open_cmd);
 173     }
 174 }
 175
 176 static int quit_f(BlockDriverState *bs, int argc, char **argv)
 177 {
 178     return 1;
 179 }
 180
 181 #if !defined(_WIN32)
 182 # include "qemu-io-sim.c"
 183 #endif
 184
 185 static const cmdinfo_t quit_cmd = {
 186     .name       = "quit",
 187     .altname    = "q",
 188     .cfunc      = quit_f,
 189     .argmin     = -1,
 190     .argmax     = -1,
 191     .flags      = CMD_FLAG_GLOBAL,
 192     .oneline    = "exit the program",
 193 };
 194
 195 static void usage(const char *name)
 196 {
 197     printf(
 198 "Usage: %s [-h] [-V] [-rsnm] [-c STRING] ... [file]\n"
 199 "QEMU Disk exerciser\n"
 200 "\n"
 201 "  -c, --cmd STRING     execute command with its arguments\n"
 202 "                       from the given string\n"
 203 "  -r, --read-only      export read-only\n"
 204 "  -s, --snapshot       use snapshot file\n"
 205 "  -n, --nocache        disable host cache\n"
 206 "  -g, --growable       allow file to grow (only applies to protocols)\n"
 207 "  -m, --misalign       misalign allocations for O_DIRECT\n"
 208 "  -k, --native-aio     use kernel AIO implementation (on Linux only)\n"
 209 "  -t, --cache=MODE     use the given cache mode for the image\n"
 210 "  -T, --trace FILE     enable trace events listed in the given file\n"
 211 "  -h, --help           display this help and exit\n"
 212 "  -V, --version        output version information and exit\n"
 213 "\n"
 214 "See '%s -c help' for information on available commands."
 215 "\n",
 216     name, name);
 217 }
 218
 219 static char *get_prompt(void)
 220 {
 221     static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];
 222
 223     if (!prompt[0]) {
 224         snprintf(prompt, sizeof(prompt), "%s> ", progname);
 225     }
 226
 227     return prompt;
 228 }
 229
 230 static void GCC_FMT_ATTR(2, 3) readline_printf_func(void *opaque,
 231                                                     const char *fmt, ...)
 232 {
 233     va_list ap;
 234     va_start(ap, fmt);
 235     vprintf(fmt, ap);
 236     va_end(ap);
 237 }
 238
 239 static void readline_flush_func(void *opaque)
 240 {
 241     fflush(stdout);
 242 }
 243
 244 static void readline_func(void *opaque, const char *str, void *readline_opaque)
 245 {
 246     char **line = readline_opaque;
 247     *line = g_strdup(str);
 248 }
 249
 250 static void completion_match(const char *cmd, void *opaque)
 251 {
 252     readline_add_completion(readline_state, cmd);
 253 }
 254
 255 static void readline_completion_func(void *opaque, const char *str)
 256 {
 257     readline_set_completion_index(readline_state, strlen(str));
 258     qemuio_complete_command(str, completion_match, NULL);
 259 }
 260
 261 static char *fetchline_readline(void)
 262 {
 263     char *line = NULL;
 264
 265     readline_start(readline_state, get_prompt(), 0, readline_func, &line);
 266     while (!line) {
 267         int ch = getchar();
 268         if (ch == EOF) {
 269             break;
 270         }
 271         readline_handle_byte(readline_state, ch);
 272     }
 273     return line;
 274 }
 275
 276 #define MAXREADLINESZ 1024
 277 static char *fetchline_fgets(void)
 278 {
 279     char *p, *line = g_malloc(MAXREADLINESZ);
 280
 281     if (!fgets(line, MAXREADLINESZ, stdin)) {
 282         g_free(line);
 283         return NULL;
 284     }
 285
 286     p = line + strlen(line);
 287     if (p != line && p[-1] == '\n') {
 288         p[-1] = '\0';
 289     }
 290
 291     return line;
 292 }
 293
 294 static char *fetchline(void)
 295 {
 296     if (readline_state) {
 297         return fetchline_readline();
 298     } else {
 299         return fetchline_fgets();
 300     }
 301 }
 302
 303 static void prep_fetchline(void *opaque)
 304 {
 305     int *fetchable = opaque;
 306
 307     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 308     *fetchable= 1;
 309 }
 310
 311 static void command_loop(void)
 312 {
 313     int i, done = 0, fetchable = 0, prompted = 0;
 314     char *input;
 315
 316     for (i = 0; !done && i < ncmdline; i++) {
 317         done = qemuio_command(qemuio_bs, cmdline[i]);
 318     }
 319     if (cmdline) {
 320         g_free(cmdline);
 321         return;
 322     }
 323
 324     while (!done) {
 325         if (!prompted) {
 326             printf("%s", get_prompt());
 327             fflush(stdout);
 328             qemu_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, &fetchable);
 329             prompted = 1;
 330         }
 331
 332         main_loop_wait(false);
 333
 334         if (!fetchable) {
 335             continue;
 336         }
 337
 338         input = fetchline();
 339         if (input == NULL) {
 340             break;
 341         }
 342         done = qemuio_command(qemuio_bs, input);
 343         g_free(input);
 344
 345         prompted = 0;
 346         fetchable = 0;
 347     }
 348     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 349 }
 350
 351 static void add_user_command(char *optarg)
 352 {
 353     cmdline = g_renew(char *, cmdline, ++ncmdline);
 354     cmdline[ncmdline-1] = optarg;
 355 }
 356
 357 static void reenable_tty_echo(void)
 358 {
 359     qemu_set_tty_echo(STDIN_FILENO, true);
 360 }
 361
 362 int main(int argc, char **argv)
 363 {
 364     int readonly = 0;
 365     int growable = 0;
 366     const char *sopt = "hVc:d:rsnmgkt:T:";
 367     const struct option lopt[] = {
 368         { "help", 0, NULL, 'h' },
 369         { "version", 0, NULL, 'V' },
 370         { "offset", 1, NULL, 'o' },
 371         { "cmd", 1, NULL, 'c' },
 372         { "read-only", 0, NULL, 'r' },
 373         { "snapshot", 0, NULL, 's' },
 374         { "nocache", 0, NULL, 'n' },
 375         { "misalign", 0, NULL, 'm' },
 376         { "growable", 0, NULL, 'g' },
 377         { "native-aio", 0, NULL, 'k' },
 378         { "discard", 1, NULL, 'd' },
 379         { "cache", 1, NULL, 't' },
 380         { "trace", 1, NULL, 'T' },
 381         { NULL, 0, NULL, 0 }
 382     };
 383     int c;
 384     int opt_index = 0;
 385     int flags = BDRV_O_UNMAP;
 386     Error *local_error = NULL;
 387
 388 #ifdef CONFIG_POSIX
 389     signal(SIGPIPE, SIG_IGN);
 390 #endif
 391
 392     progname = basename(argv[0]);
 393     qemu_init_exec_dir(argv[0]);
 394
 395     while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
 396         switch (c) {
 397         case 's':
 398             flags |= BDRV_O_SNAPSHOT;
 399             break;
 400         case 'n':
 401             flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
 402             break;
 403         case 'd':
 404             if (bdrv_parse_discard_flags(optarg, &flags) < 0) {
 405                 error_report("Invalid discard option: %s", optarg);
 406                 exit(1);
 407             }
 408             break;
 409         case 'c':
 410             add_user_command(optarg);
 411             break;
 412         case 'r':
 413             readonly = 1;
 414             break;
 415         case 'm':
 416             qemuio_misalign = true;
 417             break;
 418         case 'g':
 419             growable = 1;
 420             break;
 421         case 'k':
 422             flags |= BDRV_O_NATIVE_AIO;
 423             break;
 424         case 't':
 425             if (bdrv_parse_cache_flags(optarg, &flags) < 0) {
 426                 error_report("Invalid cache option: %s", optarg);
 427                 exit(1);
 428             }
 429             break;
 430         case 'T':
 431             if (!trace_init_backends(optarg, NULL)) {
 432                 exit(1); /* error message will have been printed */
 433             }
 434             break;
 435         case 'V':
 436             printf("%s version %s\n", progname, QEMU_VERSION);
 437             exit(0);
 438         case 'h':
 439             usage(progname);
 440             exit(0);
 441         default:
 442             usage(progname);
 443             exit(1);
 444         }
 445     }
 446
 447     if ((argc - optind) > 1) {
 448         usage(progname);
 449         exit(1);
 450     }
 451
 452     if (qemu_init_main_loop(&local_error)) {
 453         error_report("%s", error_get_pretty(local_error));
 454         error_free(local_error);
 455         exit(1);
 456     }
 457     bdrv_init();
 458
 459     /* initialize commands */
 460     qemuio_add_command(&quit_cmd);
 461     qemuio_add_command(&open_cmd);
 462     qemuio_add_command(&close_cmd);
 463
 464     if (isatty(STDIN_FILENO)) {
 465         readline_state = readline_init(readline_printf_func,
 466                                        readline_flush_func,
 467                                        NULL,
 468                                        readline_completion_func);
 469         qemu_set_tty_echo(STDIN_FILENO, false);
 470         atexit(reenable_tty_echo);
 471     }
 472
 473     /* open the device */
 474     if (!readonly) {
 475         flags |= BDRV_O_RDWR;
 476     }
 477
 478     if ((argc - optind) == 1) {
 479         openfile(argv[optind], flags, growable, NULL);
 480     }
 481     command_loop();
 482
 483     /*
 484      * Make sure all outstanding requests complete before the program exits.
 485      */
 486     bdrv_drain_all();
 487
 488     if (qemuio_bs) {
 489         bdrv_unref(qemuio_bs);
 490     }
 491     g_free(readline_state);
 492     return 0;
 493 }