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
  41     QLIST_HEAD(, BlkdebugRule) rules[BLKDBG__MAX];
  42     QSIMPLEQ_HEAD(, BlkdebugRule) active_rules;
  43     QLIST_HEAD(, BlkdebugSuspendedReq) suspended_reqs;
  44 } BDRVBlkdebugState;
  45
  46 typedef struct BlkdebugAIOCB {
  47     BlockAIOCB common;
  48     QEMUBH *bh;
  49     int ret;
  50 } BlkdebugAIOCB;
  51
  52 typedef struct BlkdebugSuspendedReq {
  53     Coroutine *co;
  54     char *tag;
  55     QLIST_ENTRY(BlkdebugSuspendedReq) next;
  56 } BlkdebugSuspendedReq;
  57
  58 static const AIOCBInfo blkdebug_aiocb_info = {
  59     .aiocb_size    = sizeof(BlkdebugAIOCB),
  60 };
  61
  62 enum {
  63     ACTION_INJECT_ERROR,
  64     ACTION_SET_STATE,
  65     ACTION_SUSPEND,
  66 };
  67
  68 typedef struct BlkdebugRule {
  69     BlkdebugEvent event;
  70     int action;
  71     int state;
  72     union {
  73         struct {
  74             int error;
  75             int immediately;
  76             int once;
  77             int64_t sector;
  78         } inject;
  79         struct {
  80             int new_state;
  81         } set_state;
  82         struct {
  83             char *tag;
  84         } suspend;
  85     } options;
  86     QLIST_ENTRY(BlkdebugRule) next;
  87     QSIMPLEQ_ENTRY(BlkdebugRule) active_next;
  88 } BlkdebugRule;
  89
  90 static QemuOptsList inject_error_opts = {
  91     .name = "inject-error",
  92     .head = QTAILQ_HEAD_INITIALIZER(inject_error_opts.head),
  93     .desc = {
  94         {
  95             .name = "event",
  96             .type = QEMU_OPT_STRING,
  97         },
  98         {
  99             .name = "state",
 100             .type = QEMU_OPT_NUMBER,
 101         },
 102         {
 103             .name = "errno",
 104             .type = QEMU_OPT_NUMBER,
 105         },
 106         {
 107             .name = "sector",
 108             .type = QEMU_OPT_NUMBER,
 109         },
 110         {
 111             .name = "once",
 112             .type = QEMU_OPT_BOOL,
 113         },
 114         {
 115             .name = "immediately",
 116             .type = QEMU_OPT_BOOL,
 117         },
 118         { /* end of list */ }
 119     },
 120 };
 121
 122 static QemuOptsList set_state_opts = {
 123     .name = "set-state",
 124     .head = QTAILQ_HEAD_INITIALIZER(set_state_opts.head),
 125     .desc = {
 126         {
 127             .name = "event",
 128             .type = QEMU_OPT_STRING,
 129         },
 130         {
 131             .name = "state",
 132             .type = QEMU_OPT_NUMBER,
 133         },
 134         {
 135             .name = "new_state",
 136             .type = QEMU_OPT_NUMBER,
 137         },
 138         { /* end of list */ }
 139     },
 140 };
 141
 142 static QemuOptsList *config_groups[] = {
 143     &inject_error_opts,
 144     &set_state_opts,
 145     NULL
 146 };
 147
 148 static int get_event_by_name(const char *name, BlkdebugEvent *event)
 149 {
 150     int i;
 151
 152     for (i = 0; i < BLKDBG__MAX; i++) {
 153         if (!strcmp(BlkdebugEvent_lookup[i], name)) {
 154             *event = i;
 155             return 0;
 156         }
 157     }
 158
 159     return -1;
 160 }
 161
 162 struct add_rule_data {
 163     BDRVBlkdebugState *s;
 164     int action;
 165 };
 166
 167 static int add_rule(void *opaque, QemuOpts *opts, Error **errp)
 168 {
 169     struct add_rule_data *d = opaque;
 170     BDRVBlkdebugState *s = d->s;
 171     const char* event_name;
 172     BlkdebugEvent event;
 173     struct BlkdebugRule *rule;
 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         rule->options.inject.sector = qemu_opt_get_number(opts, "sector", -1);
 201         break;
 202
 203     case ACTION_SET_STATE:
 204         rule->options.set_state.new_state =
 205             qemu_opt_get_number(opts, "new_state", 0);
 206         break;
 207
 208     case ACTION_SUSPEND:
 209         rule->options.suspend.tag =
 210             g_strdup(qemu_opt_get(opts, "tag"));
 211         break;
 212     };
 213
 214     /* Add the rule */
 215     QLIST_INSERT_HEAD(&s->rules[event], rule, next);
 216
 217     return 0;
 218 }
 219
 220 static void remove_rule(BlkdebugRule *rule)
 221 {
 222     switch (rule->action) {
 223     case ACTION_INJECT_ERROR:
 224     case ACTION_SET_STATE:
 225         break;
 226     case ACTION_SUSPEND:
 227         g_free(rule->options.suspend.tag);
 228         break;
 229     }
 230
 231     QLIST_REMOVE(rule, next);
 232     g_free(rule);
 233 }
 234
 235 static int read_config(BDRVBlkdebugState *s, const char *filename,
 236                        QDict *options, Error **errp)
 237 {
 238     FILE *f = NULL;
 239     int ret;
 240     struct add_rule_data d;
 241     Error *local_err = NULL;
 242
 243     if (filename) {
 244         f = fopen(filename, "r");
 245         if (f == NULL) {
 246             error_setg_errno(errp, errno, "Could not read blkdebug config file");
 247             return -errno;
 248         }
 249
 250         ret = qemu_config_parse(f, config_groups, filename);
 251         if (ret < 0) {
 252             error_setg(errp, "Could not parse blkdebug config file");
 253             ret = -EINVAL;
 254             goto fail;
 255         }
 256     }
 257
 258     qemu_config_parse_qdict(options, config_groups, &local_err);
 259     if (local_err) {
 260         error_propagate(errp, local_err);
 261         ret = -EINVAL;
 262         goto fail;
 263     }
 264
 265     d.s = s;
 266     d.action = ACTION_INJECT_ERROR;
 267     qemu_opts_foreach(&inject_error_opts, add_rule, &d, &local_err);
 268     if (local_err) {
 269         error_propagate(errp, local_err);
 270         ret = -EINVAL;
 271         goto fail;
 272     }
 273
 274     d.action = ACTION_SET_STATE;
 275     qemu_opts_foreach(&set_state_opts, add_rule, &d, &local_err);
 276     if (local_err) {
 277         error_propagate(errp, local_err);
 278         ret = -EINVAL;
 279         goto fail;
 280     }
 281
 282     ret = 0;
 283 fail:
 284     qemu_opts_reset(&inject_error_opts);
 285     qemu_opts_reset(&set_state_opts);
 286     if (f) {
 287         fclose(f);
 288     }
 289     return ret;
 290 }
 291
 292 /* Valid blkdebug filenames look like blkdebug:path/to/config:path/to/image */
 293 static void blkdebug_parse_filename(const char *filename, QDict *options,
 294                                     Error **errp)
 295 {
 296     const char *c;
 297
 298     /* Parse the blkdebug: prefix */
 299     if (!strstart(filename, "blkdebug:", &filename)) {
 300         /* There was no prefix; therefore, all options have to be already
 301            present in the QDict (except for the filename) */
 302         qdict_put(options, "x-image", qstring_from_str(filename));
 303         return;
 304     }
 305
 306     /* Parse config file path */
 307     c = strchr(filename, ':');
 308     if (c == NULL) {
 309         error_setg(errp, "blkdebug requires both config file and image path");
 310         return;
 311     }
 312
 313     if (c != filename) {
 314         QString *config_path;
 315         config_path = qstring_from_substr(filename, 0, c - filename - 1);
 316         qdict_put(options, "config", config_path);
 317     }
 318
 319     /* TODO Allow multi-level nesting and set file.filename here */
 320     filename = c + 1;
 321     qdict_put(options, "x-image", qstring_from_str(filename));
 322 }
 323
 324 static QemuOptsList runtime_opts = {
 325     .name = "blkdebug",
 326     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
 327     .desc = {
 328         {
 329             .name = "config",
 330             .type = QEMU_OPT_STRING,
 331             .help = "Path to the configuration file",
 332         },
 333         {
 334             .name = "x-image",
 335             .type = QEMU_OPT_STRING,
 336             .help = "[internal use only, will be removed]",
 337         },
 338         {
 339             .name = "align",
 340             .type = QEMU_OPT_SIZE,
 341             .help = "Required alignment in bytes",
 342         },
 343         { /* end of list */ }
 344     },
 345 };
 346
 347 static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
 348                          Error **errp)
 349 {
 350     BDRVBlkdebugState *s = bs->opaque;
 351     QemuOpts *opts;
 352     Error *local_err = NULL;
 353     const char *config;
 354     uint64_t align;
 355     int ret;
 356
 357     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
 358     qemu_opts_absorb_qdict(opts, options, &local_err);
 359     if (local_err) {
 360         error_propagate(errp, local_err);
 361         ret = -EINVAL;
 362         goto out;
 363     }
 364
 365     /* Read rules from config file or command line options */
 366     config = qemu_opt_get(opts, "config");
 367     ret = read_config(s, config, options, errp);
 368     if (ret) {
 369         goto out;
 370     }
 371
 372     /* Set initial state */
 373     s->state = 1;
 374
 375     /* Open the image file */
 376     bs->file = bdrv_open_child(qemu_opt_get(opts, "x-image"), options, "image",
 377                                bs, &child_file, false, &local_err);
 378     if (local_err) {
 379         ret = -EINVAL;
 380         error_propagate(errp, local_err);
 381         goto out;
 382     }
 383
 384     /* Set request alignment */
 385     align = qemu_opt_get_size(opts, "align", bs->request_alignment);
 386     if (align > 0 && align < INT_MAX && !(align & (align - 1))) {
 387         bs->request_alignment = align;
 388     } else {
 389         error_setg(errp, "Invalid alignment");
 390         ret = -EINVAL;
 391         goto fail_unref;
 392     }
 393
 394     ret = 0;
 395     goto out;
 396
 397 fail_unref:
 398     bdrv_unref_child(bs, bs->file);
 399 out:
 400     qemu_opts_del(opts);
 401     return ret;
 402 }
 403
 404 static void error_callback_bh(void *opaque)
 405 {
 406     struct BlkdebugAIOCB *acb = opaque;
 407     qemu_bh_delete(acb->bh);
 408     acb->common.cb(acb->common.opaque, acb->ret);
 409     qemu_aio_unref(acb);
 410 }
 411
 412 static BlockAIOCB *inject_error(BlockDriverState *bs,
 413     BlockCompletionFunc *cb, void *opaque, BlkdebugRule *rule)
 414 {
 415     BDRVBlkdebugState *s = bs->opaque;
 416     int error = rule->options.inject.error;
 417     struct BlkdebugAIOCB *acb;
 418     QEMUBH *bh;
 419     bool immediately = rule->options.inject.immediately;
 420
 421     if (rule->options.inject.once) {
 422         QSIMPLEQ_REMOVE(&s->active_rules, rule, BlkdebugRule, active_next);
 423         remove_rule(rule);
 424     }
 425
 426     if (immediately) {
 427         return NULL;
 428     }
 429
 430     acb = qemu_aio_get(&blkdebug_aiocb_info, bs, cb, opaque);
 431     acb->ret = -error;
 432
 433     bh = aio_bh_new(bdrv_get_aio_context(bs), error_callback_bh, acb);
 434     acb->bh = bh;
 435     qemu_bh_schedule(bh);
 436
 437     return &acb->common;
 438 }
 439
 440 static BlockAIOCB *blkdebug_aio_readv(BlockDriverState *bs,
 441     int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 442     BlockCompletionFunc *cb, void *opaque)
 443 {
 444     BDRVBlkdebugState *s = bs->opaque;
 445     BlkdebugRule *rule = NULL;
 446
 447     QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
 448         if (rule->options.inject.sector == -1 ||
 449             (rule->options.inject.sector >= sector_num &&
 450              rule->options.inject.sector < sector_num + nb_sectors)) {
 451             break;
 452         }
 453     }
 454
 455     if (rule && rule->options.inject.error) {
 456         return inject_error(bs, cb, opaque, rule);
 457     }
 458
 459     return bdrv_aio_readv(bs->file->bs, sector_num, qiov, nb_sectors,
 460                           cb, opaque);
 461 }
 462
 463 static BlockAIOCB *blkdebug_aio_writev(BlockDriverState *bs,
 464     int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 465     BlockCompletionFunc *cb, void *opaque)
 466 {
 467     BDRVBlkdebugState *s = bs->opaque;
 468     BlkdebugRule *rule = NULL;
 469
 470     QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
 471         if (rule->options.inject.sector == -1 ||
 472             (rule->options.inject.sector >= sector_num &&
 473              rule->options.inject.sector < sector_num + nb_sectors)) {
 474             break;
 475         }
 476     }
 477
 478     if (rule && rule->options.inject.error) {
 479         return inject_error(bs, cb, opaque, rule);
 480     }
 481
 482     return bdrv_aio_writev(bs->file->bs, sector_num, qiov, nb_sectors,
 483                            cb, opaque);
 484 }
 485
 486 static BlockAIOCB *blkdebug_aio_flush(BlockDriverState *bs,
 487     BlockCompletionFunc *cb, void *opaque)
 488 {
 489     BDRVBlkdebugState *s = bs->opaque;
 490     BlkdebugRule *rule = NULL;
 491
 492     QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
 493         if (rule->options.inject.sector == -1) {
 494             break;
 495         }
 496     }
 497
 498     if (rule && rule->options.inject.error) {
 499         return inject_error(bs, cb, opaque, rule);
 500     }
 501
 502     return bdrv_aio_flush(bs->file->bs, cb, opaque);
 503 }
 504
 505
 506 static void blkdebug_close(BlockDriverState *bs)
 507 {
 508     BDRVBlkdebugState *s = bs->opaque;
 509     BlkdebugRule *rule, *next;
 510     int i;
 511
 512     for (i = 0; i < BLKDBG__MAX; i++) {
 513         QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
 514             remove_rule(rule);
 515         }
 516     }
 517 }
 518
 519 static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule)
 520 {
 521     BDRVBlkdebugState *s = bs->opaque;
 522     BlkdebugSuspendedReq r;
 523
 524     r = (BlkdebugSuspendedReq) {
 525         .co         = qemu_coroutine_self(),
 526         .tag        = g_strdup(rule->options.suspend.tag),
 527     };
 528
 529     remove_rule(rule);
 530     QLIST_INSERT_HEAD(&s->suspended_reqs, &r, next);
 531
 532     if (!qtest_enabled()) {
 533         printf("blkdebug: Suspended request '%s'\n", r.tag);
 534     }
 535     qemu_coroutine_yield();
 536     if (!qtest_enabled()) {
 537         printf("blkdebug: Resuming request '%s'\n", r.tag);
 538     }
 539
 540     QLIST_REMOVE(&r, next);
 541     g_free(r.tag);
 542 }
 543
 544 static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
 545     bool injected)
 546 {
 547     BDRVBlkdebugState *s = bs->opaque;
 548
 549     /* Only process rules for the current state */
 550     if (rule->state && rule->state != s->state) {
 551         return injected;
 552     }
 553
 554     /* Take the action */
 555     switch (rule->action) {
 556     case ACTION_INJECT_ERROR:
 557         if (!injected) {
 558             QSIMPLEQ_INIT(&s->active_rules);
 559             injected = true;
 560         }
 561         QSIMPLEQ_INSERT_HEAD(&s->active_rules, rule, active_next);
 562         break;
 563
 564     case ACTION_SET_STATE:
 565         s->new_state = rule->options.set_state.new_state;
 566         break;
 567
 568     case ACTION_SUSPEND:
 569         suspend_request(bs, rule);
 570         break;
 571     }
 572     return injected;
 573 }
 574
 575 static void blkdebug_debug_event(BlockDriverState *bs, BlkdebugEvent event)
 576 {
 577     BDRVBlkdebugState *s = bs->opaque;
 578     struct BlkdebugRule *rule, *next;
 579     bool injected;
 580
 581     assert((int)event >= 0 && event < BLKDBG__MAX);
 582
 583     injected = false;
 584     s->new_state = s->state;
 585     QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) {
 586         injected = process_rule(bs, rule, injected);
 587     }
 588     s->state = s->new_state;
 589 }
 590
 591 static int blkdebug_debug_breakpoint(BlockDriverState *bs, const char *event,
 592                                      const char *tag)
 593 {
 594     BDRVBlkdebugState *s = bs->opaque;
 595     struct BlkdebugRule *rule;
 596     BlkdebugEvent blkdebug_event;
 597
 598     if (get_event_by_name(event, &blkdebug_event) < 0) {
 599         return -ENOENT;
 600     }
 601
 602
 603     rule = g_malloc(sizeof(*rule));
 604     *rule = (struct BlkdebugRule) {
 605         .event  = blkdebug_event,
 606         .action = ACTION_SUSPEND,
 607         .state  = 0,
 608         .options.suspend.tag = g_strdup(tag),
 609     };
 610
 611     QLIST_INSERT_HEAD(&s->rules[blkdebug_event], rule, next);
 612
 613     return 0;
 614 }
 615
 616 static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag)
 617 {
 618     BDRVBlkdebugState *s = bs->opaque;
 619     BlkdebugSuspendedReq *r, *next;
 620
 621     QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, next) {
 622         if (!strcmp(r->tag, tag)) {
 623             qemu_coroutine_enter(r->co, NULL);
 624             return 0;
 625         }
 626     }
 627     return -ENOENT;
 628 }
 629
 630 static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs,
 631                                             const char *tag)
 632 {
 633     BDRVBlkdebugState *s = bs->opaque;
 634     BlkdebugSuspendedReq *r, *r_next;
 635     BlkdebugRule *rule, *next;
 636     int i, ret = -ENOENT;
 637
 638     for (i = 0; i < BLKDBG__MAX; i++) {
 639         QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) {
 640             if (rule->action == ACTION_SUSPEND &&
 641                 !strcmp(rule->options.suspend.tag, tag)) {
 642                 remove_rule(rule);
 643                 ret = 0;
 644             }
 645         }
 646     }
 647     QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, r_next) {
 648         if (!strcmp(r->tag, tag)) {
 649             qemu_coroutine_enter(r->co, NULL);
 650             ret = 0;
 651         }
 652     }
 653     return ret;
 654 }
 655
 656 static bool blkdebug_debug_is_suspended(BlockDriverState *bs, const char *tag)
 657 {
 658     BDRVBlkdebugState *s = bs->opaque;
 659     BlkdebugSuspendedReq *r;
 660
 661     QLIST_FOREACH(r, &s->suspended_reqs, next) {
 662         if (!strcmp(r->tag, tag)) {
 663             return true;
 664         }
 665     }
 666     return false;
 667 }
 668
 669 static int64_t blkdebug_getlength(BlockDriverState *bs)
 670 {
 671     return bdrv_getlength(bs->file->bs);
 672 }
 673
 674 static int blkdebug_truncate(BlockDriverState *bs, int64_t offset)
 675 {
 676     return bdrv_truncate(bs->file->bs, offset);
 677 }
 678
 679 static void blkdebug_refresh_filename(BlockDriverState *bs, QDict *options)
 680 {
 681     QDict *opts;
 682     const QDictEntry *e;
 683     bool force_json = false;
 684
 685     for (e = qdict_first(options); e; e = qdict_next(options, e)) {
 686         if (strcmp(qdict_entry_key(e), "config") &&
 687             strcmp(qdict_entry_key(e), "x-image"))
 688         {
 689             force_json = true;
 690             break;
 691         }
 692     }
 693
 694     if (force_json && !bs->file->bs->full_open_options) {
 695         /* The config file cannot be recreated, so creating a plain filename
 696          * is impossible */
 697         return;
 698     }
 699
 700     if (!force_json && bs->file->bs->exact_filename[0]) {
 701         snprintf(bs->exact_filename, sizeof(bs->exact_filename),
 702                  "blkdebug:%s:%s",
 703                  qdict_get_try_str(options, "config") ?: "",
 704                  bs->file->bs->exact_filename);
 705     }
 706
 707     opts = qdict_new();
 708     qdict_put_obj(opts, "driver", QOBJECT(qstring_from_str("blkdebug")));
 709
 710     QINCREF(bs->file->bs->full_open_options);
 711     qdict_put_obj(opts, "image", QOBJECT(bs->file->bs->full_open_options));
 712
 713     for (e = qdict_first(options); e; e = qdict_next(options, e)) {
 714         if (strcmp(qdict_entry_key(e), "x-image")) {
 715             qobject_incref(qdict_entry_value(e));
 716             qdict_put_obj(opts, qdict_entry_key(e), qdict_entry_value(e));
 717         }
 718     }
 719
 720     bs->full_open_options = opts;
 721 }
 722
 723 static int blkdebug_reopen_prepare(BDRVReopenState *reopen_state,
 724                                    BlockReopenQueue *queue, Error **errp)
 725 {
 726     return 0;
 727 }
 728
 729 static BlockDriver bdrv_blkdebug = {
 730     .format_name            = "blkdebug",
 731     .protocol_name          = "blkdebug",
 732     .instance_size          = sizeof(BDRVBlkdebugState),
 733
 734     .bdrv_parse_filename    = blkdebug_parse_filename,
 735     .bdrv_file_open         = blkdebug_open,
 736     .bdrv_close             = blkdebug_close,
 737     .bdrv_reopen_prepare    = blkdebug_reopen_prepare,
 738     .bdrv_getlength         = blkdebug_getlength,
 739     .bdrv_truncate          = blkdebug_truncate,
 740     .bdrv_refresh_filename  = blkdebug_refresh_filename,
 741
 742     .bdrv_aio_readv         = blkdebug_aio_readv,
 743     .bdrv_aio_writev        = blkdebug_aio_writev,
 744     .bdrv_aio_flush         = blkdebug_aio_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);