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