block/blkdebug.c

   1 /*
   2  * Block protocol for I/O error injection
   3  *
   4  * Copyright (c) 2010 Kevin Wolf <kwolf@redhat.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "qapi/error.h"
  27 #include "qemu/cutils.h"
  28 #include "qemu/config-file.h"
  29 #include "block/block_int.h"
  30 #include "qemu/module.h"
  31 #include "qapi/qmp/qbool.h"
  32 #include "qapi/qmp/qdict.h"
  33 #include "qapi/qmp/qint.h"
  34 #include "qapi/qmp/qstring.h"
  35 #include "sysemu/qtest.h"
  36
  37 typedef struct BDRVBlkdebugState {
  38     int state;
  39     int new_state;
  40     int align;
  41
  42     /* For blkdebug_refresh_filename() */
  43     char *config_file;
  44
  45     QLIST_HEAD(, BlkdebugRule) rules[BLKDBG__MAX];
  46     QSIMPLEQ_HEAD(, BlkdebugRule) active_rules;
  47     QLIST_HEAD(, BlkdebugSuspendedReq) suspended_reqs;
  48 } BDRVBlkdebugState;
  49
  50 typedef struct BlkdebugAIOCB {
  51     BlockAIOCB common;
  52     int ret;
  53 } BlkdebugAIOCB;
  54
  55 typedef struct BlkdebugSuspendedReq {
  56     Coroutine *co;
  57     char *tag;
  58     QLIST_ENTRY(BlkdebugSuspendedReq) next;
  59 } BlkdebugSuspendedReq;
  60
  61 enum {
  62     ACTION_INJECT_ERROR,
  63     ACTION_SET_STATE,
  64     ACTION_SUSPEND,
  65 };
  66
  67 typedef struct BlkdebugRule {
  68     BlkdebugEvent event;
  69     int action;
  70     int state;
  71     union {
  72         struct {
  73             int error;
  74             int immediately;
  75             int once;
  76             int64_t offset;
  77         } inject;
  78         struct {
  79             int new_state;
  80         } set_state;
  81         struct {
  82             char *tag;
  83         } suspend;
  84     } options;
  85     QLIST_ENTRY(BlkdebugRule) next;
  86     QSIMPLEQ_ENTRY(BlkdebugRule) active_next;
  87 } BlkdebugRule;
  88
  89 static QemuOptsList inject_error_opts = {
  90     .name = "inject-error",
  91     .head = QTAILQ_HEAD_INITIALIZER(inject_error_opts.head),
  92     .desc = {
  93         {
  94             .name = "event",
  95             .type = QEMU_OPT_STRING,
  96         },
  97         {
  98             .name = "state",
  99             .type = QEMU_OPT_NUMBER,
 100         },
 101         {
 102             .name = "errno",
 103             .type = QEMU_OPT_NUMBER,
 104         },
 105         {
 106             .name = "sector",
 107             .type = QEMU_OPT_NUMBER,
 108         },
 109         {
 110             .name = "once",
 111             .type = QEMU_OPT_BOOL,
 112         },
 113         {
 114             .name = "immediately",
 115             .type = QEMU_OPT_BOOL,
 116         },
 117         { /* end of list */ }
 118     },
 119 };
 120
 121 static QemuOptsList set_state_opts = {
 122     .name = "set-state",
 123     .head = QTAILQ_HEAD_INITIALIZER(set_state_opts.head),
 124     .desc = {
 125         {
 126             .name = "event",
 127             .type = QEMU_OPT_STRING,
 128         },
 129         {
 130             .name = "state",
 131             .type = QEMU_OPT_NUMBER,
 132         },
 133         {
 134             .name = "new_state",
 135             .type = QEMU_OPT_NUMBER,
 136         },
 137         { /* end of list */ }
 138     },
 139 };
 140
 141 static QemuOptsList *config_groups[] = {
 142     &inject_error_opts,
 143     &set_state_opts,
 144     NULL
 145 };
 146
 147 static int get_event_by_name(const char *name, BlkdebugEvent *event)
 148 {
 149     int i;
 150
 151     for (i = 0; i < BLKDBG__MAX; i++) {
 152         if (!strcmp(BlkdebugEvent_lookup[i], name)) {
 153             *event = i;
 154             return 0;
 155         }
 156     }
 157
 158     return -1;
 159 }
 160
 161 struct add_rule_data {
 162     BDRVBlkdebugState *s;
 163     int action;
 164 };
 165
 166 static int add_rule(void *opaque, QemuOpts *opts, Error **errp)
 167 {
 168     struct add_rule_data *d = opaque;
 169     BDRVBlkdebugState *s = d->s;
 170     const char* event_name;
 171     BlkdebugEvent event;
 172     struct BlkdebugRule *rule;
 173     int64_t sector;
 174
 175     /* Find the right event for the rule */
 176     event_name = qemu_opt_get(opts, "event");
 177     if (!event_name) {
 178         error_setg(errp, "Missing event name for rule");
 179         return -1;
 180     } else if (get_event_by_name(event_name, &event) < 0) {
 181         error_setg(errp, "Invalid event name \"%s\"", event_name);
 182         return -1;
 183     }
 184
 185     /* Set attributes common for all actions */
 186     rule = g_malloc0(sizeof(*rule));
 187     *rule = (struct BlkdebugRule) {
 188         .event  = event,
 189         .action = d->action,
 190         .state  = qemu_opt_get_number(opts, "state", 0),
 191     };
 192
 193     /* Parse action-specific options */
 194     switch (d->action) {
 195     case ACTION_INJECT_ERROR:
 196         rule->options.inject.error = qemu_opt_get_number(opts, "errno", EIO);
 197         rule->options.inject.once  = qemu_opt_get_bool(opts, "once", 0);
 198         rule->options.inject.immediately =
 199             qemu_opt_get_bool(opts, "immediately", 0);
 200         sector = qemu_opt_get_number(opts, "sector", -1);
 201         rule->options.inject.offset =
 202             sector == -1 ? -1 : sector * BDRV_SECTOR_SIZE;
 203         break;
 204
 205     case ACTION_SET_STATE:
 206         rule->options.set_state.new_state =
 207             qemu_opt_get_number(opts, "new_state", 0);
 208         break;
 209
 210     case ACTION_SUSPEND:
 211         rule->options.suspend.tag =
 212             g_strdup(qemu_opt_get(opts, "tag"));
 213         break;
 214     };
 215
 216     /* Add the rule */
 217     QLIST_INSERT_HEAD(&s->rules[event], rule, next);
 218
 219     return 0;
 220 }
 221
 222 static void remove_rule(BlkdebugRule *rule)
 223 {
 224     switch (rule->action) {
 225     case ACTION_INJECT_ERROR:
 226     case ACTION_SET_STATE:
 227         break;
 228     case ACTION_SUSPEND:
 229         g_free(rule->options.suspend.tag);
 230         break;
 231     }
 232
 233     QLIST_REMOVE(rule, next);
 234     g_free(rule);
 235 }
 236
 237 static int read_config(BDRVBlkdebugState *s, const char *filename,
 238                        QDict *options, Error **errp)
 239 {
 240     FILE *f = NULL;
 241     int ret;
 242     struct add_rule_data d;
 243     Error *local_err = NULL;
 244
 245     if (filename) {
 246         f = fopen(filename, "r");
 247         if (f == NULL) {
 248             error_setg_errno(errp, errno, "Could not read blkdebug config file");
 249             return -errno;
 250         }
 251
 252         ret = qemu_config_parse(f, config_groups, filename);
 253         if (ret < 0) {
 254             error_setg(errp, "Could not parse blkdebug config file");
 255             ret = -EINVAL;
 256             goto fail;
 257         }
 258     }
 259
 260     qemu_config_parse_qdict(options, config_groups, &local_err);
 261     if (local_err) {
 262         error_propagate(errp, local_err);
 263         ret = -EINVAL;
 264         goto fail;
 265     }
 266
 267     d.s = s;
 268     d.action = ACTION_INJECT_ERROR;
 269     qemu_opts_foreach(&inject_error_opts, add_rule, &d, &local_err);
 270     if (local_err) {
 271         error_propagate(errp, local_err);
 272         ret = -EINVAL;
 273         goto fail;
 274     }
 275
 276     d.action = ACTION_SET_STATE;
 277     qemu_opts_foreach(&set_state_opts, add_rule, &d, &local_err);
 278     if (local_err) {
 279         error_propagate(errp, local_err);
 280         ret = -EINVAL;
 281         goto fail;
 282     }
 283
 284     ret = 0;
 285 fail:
 286     qemu_opts_reset(&inject_error_opts);
 287     qemu_opts_reset(&set_state_opts);
 288     if (f) {
 289         fclose(f);
 290     }
 291     return ret;
 292 }
 293
 294 /* Valid blkdebug filenames look like blkdebug:path/to/config:path/to/image */
 295 static void blkdebug_parse_filename(const char *filename, QDict *options,
 296                                     Error **errp)
 297 {
 298     const char *c;
 299
 300     /* Parse the blkdebug: prefix */
 301     if (!strstart(filename, "blkdebug:", &filename)) {
 302         /* There was no prefix; therefore, all options have to be already
 303            present in the QDict (except for the filename) */
 304         qdict_put(options, "x-image", qstring_from_str(filename));
 305         return;
 306     }
 307
 308     /* Parse config file path */
 309     c = strchr(filename, ':');
 310     if (c == NULL) {
 311         error_setg(errp, "blkdebug requires both config file and image path");
 312         return;
 313     }
 314
 315     if (c != filename) {
 316         QString *config_path;
 317         config_path = qstring_from_substr(filename, 0, c - filename - 1);
 318         qdict_put(options, "config", config_path);
 319     }
 320
 321     /* TODO Allow multi-level nesting and set file.filename here */
 322     filename = c + 1;
 323     qdict_put(options, "x-image", qstring_from_str(filename));
 324 }
 325
 326 static QemuOptsList runtime_opts = {
 327     .name = "blkdebug",
 328     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
 329     .desc = {
 330         {
 331             .name = "config",
 332             .type = QEMU_OPT_STRING,
 333             .help = "Path to the configuration file",
 334         },
 335         {
 336             .name = "x-image",
 337             .type = QEMU_OPT_STRING,
 338             .help = "[internal use only, will be removed]",
 339         },
 340         {
 341             .name = "align",
 342             .type = QEMU_OPT_SIZE,
 343             .help = "Required alignment in bytes",
 344         },
 345         { /* end of list */ }
 346     },
 347 };
 348
 349 static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
 350                          Error **errp)
 351 {
 352     BDRVBlkdebugState *s = bs->opaque;
 353     QemuOpts *opts;
 354     Error *local_err = NULL;
 355     uint64_t align;
 356     int ret;
 357
 358     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
 359     qemu_opts_absorb_qdict(opts, options, &local_err);
 360     if (local_err) {
 361         error_propagate(errp, local_err);
 362         ret = -EINVAL;
 363         goto out;
 364     }
 365
 366     /* Read rules from config file or command line options */
 367     s->config_file = g_strdup(qemu_opt_get(opts, "config"));
 368     ret = read_config(s, s->config_file, options, errp);
 369     if (ret) {
 370         goto out;
 371     }
 372
 373     /* Set initial state */
 374     s->state = 1;
 375
 376     /* Open the image file */
 377     bs->file = bdrv_open_child(qemu_opt_get(opts, "x-image"), options, "image",
 378                                bs, &child_file, false, &local_err);
 379     if (local_err) {
 380         ret = -EINVAL;
 381         error_propagate(errp, local_err);
 382         goto out;
 383     }
 384
 385     /* Set request alignment */
 386     align = qemu_opt_get_size(opts, "align", 0);
 387     if (align < INT_MAX && is_power_of_2(align)) {
 388         s->align = align;
 389     } else if (align) {
 390         error_setg(errp, "Invalid alignment");
 391         ret = -EINVAL;
 392         goto out;
 393     }
 394
 395     ret = 0;
 396     goto out;
 397
 398 out:
 399     if (ret < 0) {
 400         g_free(s->config_file);
 401     }
 402     qemu_opts_del(opts);
 403     return ret;
 404 }
 405
 406 static int inject_error(BlockDriverState *bs, BlkdebugRule *rule)
 407 {
 408     BDRVBlkdebugState *s = bs->opaque;
 409     int error = rule->options.inject.error;
 410     bool immediately = rule->options.inject.immediately;
 411
 412     if (rule->options.inject.once) {
 413         QSIMPLEQ_REMOVE(&s->active_rules, rule, BlkdebugRule, active_next);
 414         remove_rule(rule);
 415     }
 416
 417     if (!immediately) {
 418         aio_co_schedule(qemu_get_current_aio_context(), qemu_coroutine_self());
 419         qemu_coroutine_yield();
 420     }
 421
 422     return -error;
 423 }
 424
 425 static int coroutine_fn
 426 blkdebug_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
 427                    QEMUIOVector *qiov, int flags)
 428 {
 429     BDRVBlkdebugState *s = bs->opaque;
 430     BlkdebugRule *rule = NULL;
 431
 432     QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
 433         uint64_t inject_offset = rule->options.inject.offset;
 434
 435         if (inject_offset == -1 ||
 436             (inject_offset >= offset && inject_offset < offset + bytes))
 437         {
 438             break;
 439         }
 440     }
 441
 442     if (rule && rule->options.inject.error) {
 443         return inject_error(bs, rule);
 444     }
 445
 446     return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
 447 }
 448
 449 static int coroutine_fn
 450 blkdebug_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
 451                     QEMUIOVector *qiov, int flags)
 452 {
 453     BDRVBlkdebugState *s = bs->opaque;
 454     BlkdebugRule *rule = NULL;
 455
 456     QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
 457         uint64_t inject_offset = rule->options.inject.offset;
 458
 459         if (inject_offset == -1 ||
 460             (inject_offset >= offset && inject_offset < offset + bytes))
 461         {
 462             break;
 463         }
 464     }
 465
 466     if (rule && rule->options.inject.error) {
 467         return inject_error(bs, rule);
 468     }
 469
 470     return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
 471 }
 472
 473 static int blkdebug_co_flush(BlockDriverState *bs)
 474 {
 475     BDRVBlkdebugState *s = bs->opaque;
 476     BlkdebugRule *rule = NULL;
 477
 478     QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
 479         if (rule->options.inject.offset == -1) {
 480             break;
 481         }
 482     }
 483
 484     if (rule && rule->options.inject.error) {
 485         return inject_error(bs, rule);
 486     }
 487
 488     return bdrv_co_flush(bs->file->bs);
 489 }
 490
 491
 492 static void blkdebug_close(BlockDriverState *bs)
 493 {
 494     BDRVBlkdebugState *s = bs->opaque;
 495     BlkdebugRule *rule, *next;
 496     int i;
 497
 498     for (i = 0; i < BLKDBG__MAX; i++) {
 499         QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
 500             remove_rule(rule);
 501         }
 502     }
 503
 504     g_free(s->config_file);
 505 }
 506
 507 static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule)
 508 {
 509     BDRVBlkdebugState *s = bs->opaque;
 510     BlkdebugSuspendedReq r;
 511
 512     r = (BlkdebugSuspendedReq) {
 513         .co         = qemu_coroutine_self(),
 514         .tag        = g_strdup(rule->options.suspend.tag),
 515     };
 516
 517     remove_rule(rule);
 518     QLIST_INSERT_HEAD(&s->suspended_reqs, &r, next);
 519
 520     if (!qtest_enabled()) {
 521         printf("blkdebug: Suspended request '%s'\n", r.tag);
 522     }
 523     qemu_coroutine_yield();
 524     if (!qtest_enabled()) {
 525         printf("blkdebug: Resuming request '%s'\n", r.tag);
 526     }
 527
 528     QLIST_REMOVE(&r, next);
 529     g_free(r.tag);
 530 }
 531
 532 static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
 533     bool injected)
 534 {
 535     BDRVBlkdebugState *s = bs->opaque;
 536
 537     /* Only process rules for the current state */
 538     if (rule->state && rule->state != s->state) {
 539         return injected;
 540     }
 541
 542     /* Take the action */
 543     switch (rule->action) {
 544     case ACTION_INJECT_ERROR:
 545         if (!injected) {
 546             QSIMPLEQ_INIT(&s->active_rules);
 547             injected = true;
 548         }
 549         QSIMPLEQ_INSERT_HEAD(&s->active_rules, rule, active_next);
 550         break;
 551
 552     case ACTION_SET_STATE:
 553         s->new_state = rule->options.set_state.new_state;
 554         break;
 555
 556     case ACTION_SUSPEND:
 557         suspend_request(bs, rule);
 558         break;
 559     }
 560     return injected;
 561 }
 562
 563 static void blkdebug_debug_event(BlockDriverState *bs, BlkdebugEvent event)
 564 {
 565     BDRVBlkdebugState *s = bs->opaque;
 566     struct BlkdebugRule *rule, *next;
 567     bool injected;
 568
 569     assert((int)event >= 0 && event < BLKDBG__MAX);
 570
 571     injected = false;
 572     s->new_state = s->state;
 573     QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) {
 574         injected = process_rule(bs, rule, injected);
 575     }
 576     s->state = s->new_state;
 577 }
 578
 579 static int blkdebug_debug_breakpoint(BlockDriverState *bs, const char *event,
 580                                      const char *tag)
 581 {
 582     BDRVBlkdebugState *s = bs->opaque;
 583     struct BlkdebugRule *rule;
 584     BlkdebugEvent blkdebug_event;
 585
 586     if (get_event_by_name(event, &blkdebug_event) < 0) {
 587         return -ENOENT;
 588     }
 589
 590
 591     rule = g_malloc(sizeof(*rule));
 592     *rule = (struct BlkdebugRule) {
 593         .event  = blkdebug_event,
 594         .action = ACTION_SUSPEND,
 595         .state  = 0,
 596         .options.suspend.tag = g_strdup(tag),
 597     };
 598
 599     QLIST_INSERT_HEAD(&s->rules[blkdebug_event], rule, next);
 600
 601     return 0;
 602 }
 603
 604 static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag)
 605 {
 606     BDRVBlkdebugState *s = bs->opaque;
 607     BlkdebugSuspendedReq *r, *next;
 608
 609     QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, next) {
 610         if (!strcmp(r->tag, tag)) {
 611             qemu_coroutine_enter(r->co);
 612             return 0;
 613         }
 614     }
 615     return -ENOENT;
 616 }
 617
 618 static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs,
 619                                             const char *tag)
 620 {
 621     BDRVBlkdebugState *s = bs->opaque;
 622     BlkdebugSuspendedReq *r, *r_next;
 623     BlkdebugRule *rule, *next;
 624     int i, ret = -ENOENT;
 625
 626     for (i = 0; i < BLKDBG__MAX; i++) {
 627         QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
 628             if (rule->action == ACTION_SUSPEND &&
 629                 !strcmp(rule->options.suspend.tag, tag)) {
 630                 remove_rule(rule);
 631                 ret = 0;
 632             }
 633         }
 634     }
 635     QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, r_next) {
 636         if (!strcmp(r->tag, tag)) {
 637             qemu_coroutine_enter(r->co);
 638             ret = 0;
 639         }
 640     }
 641     return ret;
 642 }
 643
 644 static bool blkdebug_debug_is_suspended(BlockDriverState *bs, const char *tag)
 645 {
 646     BDRVBlkdebugState *s = bs->opaque;
 647     BlkdebugSuspendedReq *r;
 648
 649     QLIST_FOREACH(r, &s->suspended_reqs, next) {
 650         if (!strcmp(r->tag, tag)) {
 651             return true;
 652         }
 653     }
 654     return false;
 655 }
 656
 657 static int64_t blkdebug_getlength(BlockDriverState *bs)
 658 {
 659     return bdrv_getlength(bs->file->bs);
 660 }
 661
 662 static int blkdebug_truncate(BlockDriverState *bs, int64_t offset)
 663 {
 664     return bdrv_truncate(bs->file, offset, NULL);
 665 }
 666
 667 static void blkdebug_refresh_filename(BlockDriverState *bs, QDict *options)
 668 {
 669     BDRVBlkdebugState *s = bs->opaque;
 670     QDict *opts;
 671     const QDictEntry *e;
 672     bool force_json = false;
 673
 674     for (e = qdict_first(options); e; e = qdict_next(options, e)) {
 675         if (strcmp(qdict_entry_key(e), "config") &&
 676             strcmp(qdict_entry_key(e), "x-image"))
 677         {
 678             force_json = true;
 679             break;
 680         }
 681     }
 682
 683     if (force_json && !bs->file->bs->full_open_options) {
 684         /* The config file cannot be recreated, so creating a plain filename
 685          * is impossible */
 686         return;
 687     }
 688
 689     if (!force_json && bs->file->bs->exact_filename[0]) {
 690         snprintf(bs->exact_filename, sizeof(bs->exact_filename),
 691                  "blkdebug:%s:%s", s->config_file ?: "",
 692                  bs->file->bs->exact_filename);
 693     }
 694
 695     opts = qdict_new();
 696     qdict_put_obj(opts, "driver", QOBJECT(qstring_from_str("blkdebug")));
 697
 698     QINCREF(bs->file->bs->full_open_options);
 699     qdict_put_obj(opts, "image", QOBJECT(bs->file->bs->full_open_options));
 700
 701     for (e = qdict_first(options); e; e = qdict_next(options, e)) {
 702         if (strcmp(qdict_entry_key(e), "x-image")) {
 703             qobject_incref(qdict_entry_value(e));
 704             qdict_put_obj(opts, qdict_entry_key(e), qdict_entry_value(e));
 705         }
 706     }
 707
 708     bs->full_open_options = opts;
 709 }
 710
 711 static void blkdebug_refresh_limits(BlockDriverState *bs, Error **errp)
 712 {
 713     BDRVBlkdebugState *s = bs->opaque;
 714
 715     if (s->align) {
 716         bs->bl.request_alignment = s->align;
 717     }
 718 }
 719
 720 static int blkdebug_reopen_prepare(BDRVReopenState *reopen_state,
 721                                    BlockReopenQueue *queue, Error **errp)
 722 {
 723     return 0;
 724 }
 725
 726 static BlockDriver bdrv_blkdebug = {
 727     .format_name            = "blkdebug",
 728     .protocol_name          = "blkdebug",
 729     .instance_size          = sizeof(BDRVBlkdebugState),
 730
 731     .bdrv_parse_filename    = blkdebug_parse_filename,
 732     .bdrv_file_open         = blkdebug_open,
 733     .bdrv_close             = blkdebug_close,
 734     .bdrv_reopen_prepare    = blkdebug_reopen_prepare,
 735     .bdrv_child_perm        = bdrv_filter_default_perms,
 736
 737     .bdrv_getlength         = blkdebug_getlength,
 738     .bdrv_truncate          = blkdebug_truncate,
 739     .bdrv_refresh_filename  = blkdebug_refresh_filename,
 740     .bdrv_refresh_limits    = blkdebug_refresh_limits,
 741
 742     .bdrv_co_preadv         = blkdebug_co_preadv,
 743     .bdrv_co_pwritev        = blkdebug_co_pwritev,
 744     .bdrv_co_flush_to_disk  = blkdebug_co_flush,
 745
 746     .bdrv_debug_event           = blkdebug_debug_event,
 747     .bdrv_debug_breakpoint      = blkdebug_debug_breakpoint,
 748     .bdrv_debug_remove_breakpoint
 749                                 = blkdebug_debug_remove_breakpoint,
 750     .bdrv_debug_resume          = blkdebug_debug_resume,
 751     .bdrv_debug_is_suspended    = blkdebug_debug_is_suspended,
 752 };
 753
 754 static void bdrv_blkdebug_init(void)
 755 {
 756     bdrv_register(&bdrv_blkdebug);
 757 }
 758
 759 block_init(bdrv_blkdebug_init);