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 "block/block_int.h"
  20 #include "trace/control.h"
  21
  22 #define CMD_NOFILE_OK   0x01
  23
  24 char *progname;
  25
  26 BlockDriverState *qemuio_bs;
  27 extern int qemuio_misalign;
  28
  29 /* qemu-io commands passed using -c */
  30 static int ncmdline;
  31 static char **cmdline;
  32
  33 static int close_f(BlockDriverState *bs, int argc, char **argv)
  34 {
  35     bdrv_unref(bs);
  36     qemuio_bs = NULL;
  37     return 0;
  38 }
  39
  40 static const cmdinfo_t close_cmd = {
  41     .name       = "close",
  42     .altname    = "c",
  43     .cfunc      = close_f,
  44     .oneline    = "close the current open file",
  45 };
  46
  47 static int openfile(char *name, int flags, int growable)
  48 {
  49     Error *local_err = NULL;
  50
  51     if (qemuio_bs) {
  52         fprintf(stderr, "file open already, try 'help close'\n");
  53         return 1;
  54     }
  55
  56     if (growable) {
  57         if (bdrv_file_open(&qemuio_bs, name, NULL, flags, &local_err)) {
  58             fprintf(stderr, "%s: can't open device %s: %s\n", progname, name,
  59                     error_get_pretty(local_err));
  60             error_free(local_err);
  61             return 1;
  62         }
  63     } else {
  64         qemuio_bs = bdrv_new("hda");
  65
  66         if (bdrv_open(qemuio_bs, name, NULL, flags, NULL, &local_err) < 0) {
  67             fprintf(stderr, "%s: can't open device %s: %s\n", progname, name,
  68                     error_get_pretty(local_err));
  69             error_free(local_err);
  70             bdrv_unref(qemuio_bs);
  71             qemuio_bs = NULL;
  72             return 1;
  73         }
  74     }
  75
  76     return 0;
  77 }
  78
  79 static void open_help(void)
  80 {
  81     printf(
  82 "\n"
  83 " opens a new file in the requested mode\n"
  84 "\n"
  85 " Example:\n"
  86 " 'open -Cn /tmp/data' - creates/opens data file read-write and uncached\n"
  87 "\n"
  88 " Opens a file for subsequent use by all of the other qemu-io commands.\n"
  89 " -r, -- open file read-only\n"
  90 " -s, -- use snapshot file\n"
  91 " -n, -- disable host cache\n"
  92 " -g, -- allow file to grow (only applies to protocols)"
  93 "\n");
  94 }
  95
  96 static int open_f(BlockDriverState *bs, int argc, char **argv);
  97
  98 static const cmdinfo_t open_cmd = {
  99     .name       = "open",
 100     .altname    = "o",
 101     .cfunc      = open_f,
 102     .argmin     = 1,
 103     .argmax     = -1,
 104     .flags      = CMD_NOFILE_OK,
 105     .args       = "[-Crsn] [path]",
 106     .oneline    = "open the file specified by path",
 107     .help       = open_help,
 108 };
 109
 110 static int open_f(BlockDriverState *bs, int argc, char **argv)
 111 {
 112     int flags = 0;
 113     int readonly = 0;
 114     int growable = 0;
 115     int c;
 116
 117     while ((c = getopt(argc, argv, "snrg")) != EOF) {
 118         switch (c) {
 119         case 's':
 120             flags |= BDRV_O_SNAPSHOT;
 121             break;
 122         case 'n':
 123             flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
 124             break;
 125         case 'r':
 126             readonly = 1;
 127             break;
 128         case 'g':
 129             growable = 1;
 130             break;
 131         default:
 132             return qemuio_command_usage(&open_cmd);
 133         }
 134     }
 135
 136     if (!readonly) {
 137         flags |= BDRV_O_RDWR;
 138     }
 139
 140     if (optind != argc - 1) {
 141         return qemuio_command_usage(&open_cmd);
 142     }
 143
 144     return openfile(argv[optind], flags, growable);
 145 }
 146
 147 static int quit_f(BlockDriverState *bs, int argc, char **argv)
 148 {
 149     return 1;
 150 }
 151
 152 static const cmdinfo_t quit_cmd = {
 153     .name       = "quit",
 154     .altname    = "q",
 155     .cfunc      = quit_f,
 156     .argmin     = -1,
 157     .argmax     = -1,
 158     .flags      = CMD_FLAG_GLOBAL,
 159     .oneline    = "exit the program",
 160 };
 161
 162 static void usage(const char *name)
 163 {
 164     printf(
 165 "Usage: %s [-h] [-V] [-rsnm] [-c cmd] ... [file]\n"
 166 "QEMU Disk exerciser\n"
 167 "\n"
 168 "  -c, --cmd            command to execute\n"
 169 "  -r, --read-only      export read-only\n"
 170 "  -s, --snapshot       use snapshot file\n"
 171 "  -n, --nocache        disable host cache\n"
 172 "  -g, --growable       allow file to grow (only applies to protocols)\n"
 173 "  -m, --misalign       misalign allocations for O_DIRECT\n"
 174 "  -k, --native-aio     use kernel AIO implementation (on Linux only)\n"
 175 "  -t, --cache=MODE     use the given cache mode for the image\n"
 176 "  -T, --trace FILE     enable trace events listed in the given file\n"
 177 "  -h, --help           display this help and exit\n"
 178 "  -V, --version        output version information and exit\n"
 179 "\n",
 180     name);
 181 }
 182
 183
 184 #if defined(ENABLE_READLINE)
 185 # include <readline/history.h>
 186 # include <readline/readline.h>
 187 #elif defined(ENABLE_EDITLINE)
 188 # include <histedit.h>
 189 #endif
 190
 191 static char *get_prompt(void)
 192 {
 193     static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];
 194
 195     if (!prompt[0]) {
 196         snprintf(prompt, sizeof(prompt), "%s> ", progname);
 197     }
 198
 199     return prompt;
 200 }
 201
 202 #if defined(ENABLE_READLINE)
 203 static char *fetchline(void)
 204 {
 205     char *line = readline(get_prompt());
 206     if (line && *line) {
 207         add_history(line);
 208     }
 209     return line;
 210 }
 211 #elif defined(ENABLE_EDITLINE)
 212 static char *el_get_prompt(EditLine *e)
 213 {
 214     return get_prompt();
 215 }
 216
 217 static char *fetchline(void)
 218 {
 219     static EditLine *el;
 220     static History *hist;
 221     HistEvent hevent;
 222     char *line;
 223     int count;
 224
 225     if (!el) {
 226         hist = history_init();
 227         history(hist, &hevent, H_SETSIZE, 100);
 228         el = el_init(progname, stdin, stdout, stderr);
 229         el_source(el, NULL);
 230         el_set(el, EL_SIGNAL, 1);
 231         el_set(el, EL_PROMPT, el_get_prompt);
 232         el_set(el, EL_HIST, history, (const char *)hist);
 233     }
 234     line = strdup(el_gets(el, &count));
 235     if (line) {
 236         if (count > 0) {
 237             line[count-1] = '\0';
 238         }
 239         if (*line) {
 240             history(hist, &hevent, H_ENTER, line);
 241         }
 242     }
 243     return line;
 244 }
 245 #else
 246 # define MAXREADLINESZ 1024
 247 static char *fetchline(void)
 248 {
 249     char *p, *line = g_malloc(MAXREADLINESZ);
 250
 251     if (!fgets(line, MAXREADLINESZ, stdin)) {
 252         g_free(line);
 253         return NULL;
 254     }
 255
 256     p = line + strlen(line);
 257     if (p != line && p[-1] == '\n') {
 258         p[-1] = '\0';
 259     }
 260
 261     return line;
 262 }
 263 #endif
 264
 265 static void prep_fetchline(void *opaque)
 266 {
 267     int *fetchable = opaque;
 268
 269     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 270     *fetchable= 1;
 271 }
 272
 273 static void command_loop(void)
 274 {
 275     int i, done = 0, fetchable = 0, prompted = 0;
 276     char *input;
 277
 278     for (i = 0; !done && i < ncmdline; i++) {
 279         done = qemuio_command(qemuio_bs, cmdline[i]);
 280     }
 281     if (cmdline) {
 282         g_free(cmdline);
 283         return;
 284     }
 285
 286     while (!done) {
 287         if (!prompted) {
 288             printf("%s", get_prompt());
 289             fflush(stdout);
 290             qemu_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, &fetchable);
 291             prompted = 1;
 292         }
 293
 294         main_loop_wait(false);
 295
 296         if (!fetchable) {
 297             continue;
 298         }
 299
 300         input = fetchline();
 301         if (input == NULL) {
 302             break;
 303         }
 304         done = qemuio_command(qemuio_bs, input);
 305         g_free(input);
 306
 307         prompted = 0;
 308         fetchable = 0;
 309     }
 310     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 311 }
 312
 313 static void add_user_command(char *optarg)
 314 {
 315     cmdline = g_realloc(cmdline, ++ncmdline * sizeof(char *));
 316     cmdline[ncmdline-1] = optarg;
 317 }
 318
 319 int main(int argc, char **argv)
 320 {
 321     int readonly = 0;
 322     int growable = 0;
 323     const char *sopt = "hVc:d:rsnmgkt:T:";
 324     const struct option lopt[] = {
 325         { "help", 0, NULL, 'h' },
 326         { "version", 0, NULL, 'V' },
 327         { "offset", 1, NULL, 'o' },
 328         { "cmd", 1, NULL, 'c' },
 329         { "read-only", 0, NULL, 'r' },
 330         { "snapshot", 0, NULL, 's' },
 331         { "nocache", 0, NULL, 'n' },
 332         { "misalign", 0, NULL, 'm' },
 333         { "growable", 0, NULL, 'g' },
 334         { "native-aio", 0, NULL, 'k' },
 335         { "discard", 1, NULL, 'd' },
 336         { "cache", 1, NULL, 't' },
 337         { "trace", 1, NULL, 'T' },
 338         { NULL, 0, NULL, 0 }
 339     };
 340     int c;
 341     int opt_index = 0;
 342     int flags = BDRV_O_UNMAP;
 343
 344 #ifdef CONFIG_POSIX
 345     signal(SIGPIPE, SIG_IGN);
 346 #endif
 347
 348     progname = basename(argv[0]);
 349
 350     while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
 351         switch (c) {
 352         case 's':
 353             flags |= BDRV_O_SNAPSHOT;
 354             break;
 355         case 'n':
 356             flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
 357             break;
 358         case 'd':
 359             if (bdrv_parse_discard_flags(optarg, &flags) < 0) {
 360                 error_report("Invalid discard option: %s", optarg);
 361                 exit(1);
 362             }
 363             break;
 364         case 'c':
 365             add_user_command(optarg);
 366             break;
 367         case 'r':
 368             readonly = 1;
 369             break;
 370         case 'm':
 371             qemuio_misalign = 1;
 372             break;
 373         case 'g':
 374             growable = 1;
 375             break;
 376         case 'k':
 377             flags |= BDRV_O_NATIVE_AIO;
 378             break;
 379         case 't':
 380             if (bdrv_parse_cache_flags(optarg, &flags) < 0) {
 381                 error_report("Invalid cache option: %s", optarg);
 382                 exit(1);
 383             }
 384             break;
 385         case 'T':
 386             if (!trace_backend_init(optarg, NULL)) {
 387                 exit(1); /* error message will have been printed */
 388             }
 389             break;
 390         case 'V':
 391             printf("%s version %s\n", progname, QEMU_VERSION);
 392             exit(0);
 393         case 'h':
 394             usage(progname);
 395             exit(0);
 396         default:
 397             usage(progname);
 398             exit(1);
 399         }
 400     }
 401
 402     if ((argc - optind) > 1) {
 403         usage(progname);
 404         exit(1);
 405     }
 406
 407     qemu_init_main_loop();
 408     bdrv_init();
 409
 410     /* initialize commands */
 411     qemuio_add_command(&quit_cmd);
 412     qemuio_add_command(&open_cmd);
 413     qemuio_add_command(&close_cmd);
 414
 415     /* open the device */
 416     if (!readonly) {
 417         flags |= BDRV_O_RDWR;
 418     }
 419
 420     if ((argc - optind) == 1) {
 421         openfile(argv[optind], flags, growable);
 422     }
 423     command_loop();
 424
 425     /*
 426      * Make sure all outstanding requests complete before the program exits.
 427      */
 428     bdrv_drain_all();
 429
 430     if (qemuio_bs) {
 431         bdrv_unref(qemuio_bs);
 432     }
 433     return 0;
 434 }