1 /* 2 * Block protocol for I/O error injection 3 * 4 * Copyright (C) 2016-2017 Red Hat, Inc. 5 * Copyright (c) 2010 Kevin Wolf <kwolf@redhat.com> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qapi/error.h" 28 #include "qemu/cutils.h" 29 #include "qemu/config-file.h" 30 #include "block/block_int.h" 31 #include "block/qdict.h" 32 #include "qemu/module.h" 33 #include "qemu/option.h" 34 #include "qapi/qapi-visit-block-core.h" 35 #include "qapi/qmp/qdict.h" 36 #include "qapi/qmp/qlist.h" 37 #include "qapi/qmp/qstring.h" 38 #include "qapi/qobject-input-visitor.h" 39 #include "sysemu/qtest.h" 40 41 typedef struct BDRVBlkdebugState { 42 int state; 43 int new_state; 44 uint64_t align; 45 uint64_t max_transfer; 46 uint64_t opt_write_zero; 47 uint64_t max_write_zero; 48 uint64_t opt_discard; 49 uint64_t max_discard; 50 51 uint64_t take_child_perms; 52 uint64_t unshare_child_perms; 53 54 /* For blkdebug_refresh_filename() */ 55 char *config_file; 56 57 QLIST_HEAD(, BlkdebugRule) rules[BLKDBG__MAX]; 58 QSIMPLEQ_HEAD(, BlkdebugRule) active_rules; 59 QLIST_HEAD(, BlkdebugSuspendedReq) suspended_reqs; 60 } BDRVBlkdebugState; 61 62 typedef struct BlkdebugAIOCB { 63 BlockAIOCB common; 64 int ret; 65 } BlkdebugAIOCB; 66 67 typedef struct BlkdebugSuspendedReq { 68 Coroutine *co; 69 char *tag; 70 QLIST_ENTRY(BlkdebugSuspendedReq) next; 71 } BlkdebugSuspendedReq; 72 73 enum { 74 ACTION_INJECT_ERROR, 75 ACTION_SET_STATE, 76 ACTION_SUSPEND, 77 }; 78 79 typedef struct BlkdebugRule { 80 BlkdebugEvent event; 81 int action; 82 int state; 83 union { 84 struct { 85 uint64_t iotype_mask; 86 int error; 87 int immediately; 88 int once; 89 int64_t offset; 90 } inject; 91 struct { 92 int new_state; 93 } set_state; 94 struct { 95 char *tag; 96 } suspend; 97 } options; 98 QLIST_ENTRY(BlkdebugRule) next; 99 QSIMPLEQ_ENTRY(BlkdebugRule) active_next; 100 } BlkdebugRule; 101 102 QEMU_BUILD_BUG_MSG(BLKDEBUG_IO_TYPE__MAX > 64, 103 "BlkdebugIOType mask does not fit into an uint64_t"); 104 105 static QemuOptsList inject_error_opts = { 106 .name = "inject-error", 107 .head = QTAILQ_HEAD_INITIALIZER(inject_error_opts.head), 108 .desc = { 109 { 110 .name = "event", 111 .type = QEMU_OPT_STRING, 112 }, 113 { 114 .name = "state", 115 .type = QEMU_OPT_NUMBER, 116 }, 117 { 118 .name = "iotype", 119 .type = QEMU_OPT_STRING, 120 }, 121 { 122 .name = "errno", 123 .type = QEMU_OPT_NUMBER, 124 }, 125 { 126 .name = "sector", 127 .type = QEMU_OPT_NUMBER, 128 }, 129 { 130 .name = "once", 131 .type = QEMU_OPT_BOOL, 132 }, 133 { 134 .name = "immediately", 135 .type = QEMU_OPT_BOOL, 136 }, 137 { /* end of list */ } 138 }, 139 }; 140 141 static QemuOptsList set_state_opts = { 142 .name = "set-state", 143 .head = QTAILQ_HEAD_INITIALIZER(set_state_opts.head), 144 .desc = { 145 { 146 .name = "event", 147 .type = QEMU_OPT_STRING, 148 }, 149 { 150 .name = "state", 151 .type = QEMU_OPT_NUMBER, 152 }, 153 { 154 .name = "new_state", 155 .type = QEMU_OPT_NUMBER, 156 }, 157 { /* end of list */ } 158 }, 159 }; 160 161 static QemuOptsList *config_groups[] = { 162 &inject_error_opts, 163 &set_state_opts, 164 NULL 165 }; 166 167 struct add_rule_data { 168 BDRVBlkdebugState *s; 169 int action; 170 }; 171 172 static int add_rule(void *opaque, QemuOpts *opts, Error **errp) 173 { 174 struct add_rule_data *d = opaque; 175 BDRVBlkdebugState *s = d->s; 176 const char* event_name; 177 int event; 178 struct BlkdebugRule *rule; 179 int64_t sector; 180 BlkdebugIOType iotype; 181 Error *local_error = NULL; 182 183 /* Find the right event for the rule */ 184 event_name = qemu_opt_get(opts, "event"); 185 if (!event_name) { 186 error_setg(errp, "Missing event name for rule"); 187 return -1; 188 } 189 event = qapi_enum_parse(&BlkdebugEvent_lookup, event_name, -1, errp); 190 if (event < 0) { 191 return -1; 192 } 193 194 /* Set attributes common for all actions */ 195 rule = g_malloc0(sizeof(*rule)); 196 *rule = (struct BlkdebugRule) { 197 .event = event, 198 .action = d->action, 199 .state = qemu_opt_get_number(opts, "state", 0), 200 }; 201 202 /* Parse action-specific options */ 203 switch (d->action) { 204 case ACTION_INJECT_ERROR: 205 rule->options.inject.error = qemu_opt_get_number(opts, "errno", EIO); 206 rule->options.inject.once = qemu_opt_get_bool(opts, "once", 0); 207 rule->options.inject.immediately = 208 qemu_opt_get_bool(opts, "immediately", 0); 209 sector = qemu_opt_get_number(opts, "sector", -1); 210 rule->options.inject.offset = 211 sector == -1 ? -1 : sector * BDRV_SECTOR_SIZE; 212 213 iotype = qapi_enum_parse(&BlkdebugIOType_lookup, 214 qemu_opt_get(opts, "iotype"), 215 BLKDEBUG_IO_TYPE__MAX, &local_error); 216 if (local_error) { 217 error_propagate(errp, local_error); 218 return -1; 219 } 220 if (iotype != BLKDEBUG_IO_TYPE__MAX) { 221 rule->options.inject.iotype_mask = (1ull << iotype); 222 } else { 223 /* Apply the default */ 224 rule->options.inject.iotype_mask = 225 (1ull << BLKDEBUG_IO_TYPE_READ) 226 | (1ull << BLKDEBUG_IO_TYPE_WRITE) 227 | (1ull << BLKDEBUG_IO_TYPE_WRITE_ZEROES) 228 | (1ull << BLKDEBUG_IO_TYPE_DISCARD) 229 | (1ull << BLKDEBUG_IO_TYPE_FLUSH); 230 } 231 232 break; 233 234 case ACTION_SET_STATE: 235 rule->options.set_state.new_state = 236 qemu_opt_get_number(opts, "new_state", 0); 237 break; 238 239 case ACTION_SUSPEND: 240 rule->options.suspend.tag = 241 g_strdup(qemu_opt_get(opts, "tag")); 242 break; 243 }; 244 245 /* Add the rule */ 246 QLIST_INSERT_HEAD(&s->rules[event], rule, next); 247 248 return 0; 249 } 250 251 static void remove_rule(BlkdebugRule *rule) 252 { 253 switch (rule->action) { 254 case ACTION_INJECT_ERROR: 255 case ACTION_SET_STATE: 256 break; 257 case ACTION_SUSPEND: 258 g_free(rule->options.suspend.tag); 259 break; 260 } 261 262 QLIST_REMOVE(rule, next); 263 g_free(rule); 264 } 265 266 static int read_config(BDRVBlkdebugState *s, const char *filename, 267 QDict *options, Error **errp) 268 { 269 FILE *f = NULL; 270 int ret; 271 struct add_rule_data d; 272 Error *local_err = NULL; 273 274 if (filename) { 275 f = fopen(filename, "r"); 276 if (f == NULL) { 277 error_setg_errno(errp, errno, "Could not read blkdebug config file"); 278 return -errno; 279 } 280 281 ret = qemu_config_parse(f, config_groups, filename); 282 if (ret < 0) { 283 error_setg(errp, "Could not parse blkdebug config file"); 284 goto fail; 285 } 286 } 287 288 qemu_config_parse_qdict(options, config_groups, &local_err); 289 if (local_err) { 290 error_propagate(errp, local_err); 291 ret = -EINVAL; 292 goto fail; 293 } 294 295 d.s = s; 296 d.action = ACTION_INJECT_ERROR; 297 qemu_opts_foreach(&inject_error_opts, add_rule, &d, &local_err); 298 if (local_err) { 299 error_propagate(errp, local_err); 300 ret = -EINVAL; 301 goto fail; 302 } 303 304 d.action = ACTION_SET_STATE; 305 qemu_opts_foreach(&set_state_opts, add_rule, &d, &local_err); 306 if (local_err) { 307 error_propagate(errp, local_err); 308 ret = -EINVAL; 309 goto fail; 310 } 311 312 ret = 0; 313 fail: 314 qemu_opts_reset(&inject_error_opts); 315 qemu_opts_reset(&set_state_opts); 316 if (f) { 317 fclose(f); 318 } 319 return ret; 320 } 321 322 /* Valid blkdebug filenames look like blkdebug:path/to/config:path/to/image */ 323 static void blkdebug_parse_filename(const char *filename, QDict *options, 324 Error **errp) 325 { 326 const char *c; 327 328 /* Parse the blkdebug: prefix */ 329 if (!strstart(filename, "blkdebug:", &filename)) { 330 /* There was no prefix; therefore, all options have to be already 331 present in the QDict (except for the filename) */ 332 qdict_put_str(options, "x-image", filename); 333 return; 334 } 335 336 /* Parse config file path */ 337 c = strchr(filename, ':'); 338 if (c == NULL) { 339 error_setg(errp, "blkdebug requires both config file and image path"); 340 return; 341 } 342 343 if (c != filename) { 344 QString *config_path; 345 config_path = qstring_from_substr(filename, 0, c - filename); 346 qdict_put(options, "config", config_path); 347 } 348 349 /* TODO Allow multi-level nesting and set file.filename here */ 350 filename = c + 1; 351 qdict_put_str(options, "x-image", filename); 352 } 353 354 static int blkdebug_parse_perm_list(uint64_t *dest, QDict *options, 355 const char *prefix, Error **errp) 356 { 357 int ret = 0; 358 QDict *subqdict = NULL; 359 QObject *crumpled_subqdict = NULL; 360 Visitor *v = NULL; 361 BlockPermissionList *perm_list = NULL, *element; 362 363 *dest = 0; 364 365 qdict_extract_subqdict(options, &subqdict, prefix); 366 if (!qdict_size(subqdict)) { 367 goto out; 368 } 369 370 crumpled_subqdict = qdict_crumple(subqdict, errp); 371 if (!crumpled_subqdict) { 372 ret = -EINVAL; 373 goto out; 374 } 375 376 v = qobject_input_visitor_new(crumpled_subqdict); 377 if (!visit_type_BlockPermissionList(v, NULL, &perm_list, errp)) { 378 ret = -EINVAL; 379 goto out; 380 } 381 382 for (element = perm_list; element; element = element->next) { 383 *dest |= bdrv_qapi_perm_to_blk_perm(element->value); 384 } 385 386 out: 387 qapi_free_BlockPermissionList(perm_list); 388 visit_free(v); 389 qobject_unref(subqdict); 390 qobject_unref(crumpled_subqdict); 391 return ret; 392 } 393 394 static int blkdebug_parse_perms(BDRVBlkdebugState *s, QDict *options, 395 Error **errp) 396 { 397 int ret; 398 399 ret = blkdebug_parse_perm_list(&s->take_child_perms, options, 400 "take-child-perms.", errp); 401 if (ret < 0) { 402 return ret; 403 } 404 405 ret = blkdebug_parse_perm_list(&s->unshare_child_perms, options, 406 "unshare-child-perms.", errp); 407 if (ret < 0) { 408 return ret; 409 } 410 411 return 0; 412 } 413 414 static QemuOptsList runtime_opts = { 415 .name = "blkdebug", 416 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 417 .desc = { 418 { 419 .name = "config", 420 .type = QEMU_OPT_STRING, 421 .help = "Path to the configuration file", 422 }, 423 { 424 .name = "x-image", 425 .type = QEMU_OPT_STRING, 426 .help = "[internal use only, will be removed]", 427 }, 428 { 429 .name = "align", 430 .type = QEMU_OPT_SIZE, 431 .help = "Required alignment in bytes", 432 }, 433 { 434 .name = "max-transfer", 435 .type = QEMU_OPT_SIZE, 436 .help = "Maximum transfer size in bytes", 437 }, 438 { 439 .name = "opt-write-zero", 440 .type = QEMU_OPT_SIZE, 441 .help = "Optimum write zero alignment in bytes", 442 }, 443 { 444 .name = "max-write-zero", 445 .type = QEMU_OPT_SIZE, 446 .help = "Maximum write zero size in bytes", 447 }, 448 { 449 .name = "opt-discard", 450 .type = QEMU_OPT_SIZE, 451 .help = "Optimum discard alignment in bytes", 452 }, 453 { 454 .name = "max-discard", 455 .type = QEMU_OPT_SIZE, 456 .help = "Maximum discard size in bytes", 457 }, 458 { /* end of list */ } 459 }, 460 }; 461 462 static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags, 463 Error **errp) 464 { 465 BDRVBlkdebugState *s = bs->opaque; 466 QemuOpts *opts; 467 Error *local_err = NULL; 468 int ret; 469 uint64_t align; 470 471 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 472 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 473 ret = -EINVAL; 474 goto out; 475 } 476 477 /* Read rules from config file or command line options */ 478 s->config_file = g_strdup(qemu_opt_get(opts, "config")); 479 ret = read_config(s, s->config_file, options, errp); 480 if (ret) { 481 goto out; 482 } 483 484 /* Set initial state */ 485 s->state = 1; 486 487 /* Parse permissions modifiers before opening the image file */ 488 ret = blkdebug_parse_perms(s, options, errp); 489 if (ret < 0) { 490 goto out; 491 } 492 493 /* Open the image file */ 494 bs->file = bdrv_open_child(qemu_opt_get(opts, "x-image"), options, "image", 495 bs, &child_of_bds, 496 BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, 497 false, &local_err); 498 if (local_err) { 499 ret = -EINVAL; 500 error_propagate(errp, local_err); 501 goto out; 502 } 503 504 bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | 505 (BDRV_REQ_FUA & bs->file->bs->supported_write_flags); 506 bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | 507 ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & 508 bs->file->bs->supported_zero_flags); 509 ret = -EINVAL; 510 511 /* Set alignment overrides */ 512 s->align = qemu_opt_get_size(opts, "align", 0); 513 if (s->align && (s->align >= INT_MAX || !is_power_of_2(s->align))) { 514 error_setg(errp, "Cannot meet constraints with align %" PRIu64, 515 s->align); 516 goto out; 517 } 518 align = MAX(s->align, bs->file->bs->bl.request_alignment); 519 520 s->max_transfer = qemu_opt_get_size(opts, "max-transfer", 0); 521 if (s->max_transfer && 522 (s->max_transfer >= INT_MAX || 523 !QEMU_IS_ALIGNED(s->max_transfer, align))) { 524 error_setg(errp, "Cannot meet constraints with max-transfer %" PRIu64, 525 s->max_transfer); 526 goto out; 527 } 528 529 s->opt_write_zero = qemu_opt_get_size(opts, "opt-write-zero", 0); 530 if (s->opt_write_zero && 531 (s->opt_write_zero >= INT_MAX || 532 !QEMU_IS_ALIGNED(s->opt_write_zero, align))) { 533 error_setg(errp, "Cannot meet constraints with opt-write-zero %" PRIu64, 534 s->opt_write_zero); 535 goto out; 536 } 537 538 s->max_write_zero = qemu_opt_get_size(opts, "max-write-zero", 0); 539 if (s->max_write_zero && 540 (s->max_write_zero >= INT_MAX || 541 !QEMU_IS_ALIGNED(s->max_write_zero, 542 MAX(s->opt_write_zero, align)))) { 543 error_setg(errp, "Cannot meet constraints with max-write-zero %" PRIu64, 544 s->max_write_zero); 545 goto out; 546 } 547 548 s->opt_discard = qemu_opt_get_size(opts, "opt-discard", 0); 549 if (s->opt_discard && 550 (s->opt_discard >= INT_MAX || 551 !QEMU_IS_ALIGNED(s->opt_discard, align))) { 552 error_setg(errp, "Cannot meet constraints with opt-discard %" PRIu64, 553 s->opt_discard); 554 goto out; 555 } 556 557 s->max_discard = qemu_opt_get_size(opts, "max-discard", 0); 558 if (s->max_discard && 559 (s->max_discard >= INT_MAX || 560 !QEMU_IS_ALIGNED(s->max_discard, 561 MAX(s->opt_discard, align)))) { 562 error_setg(errp, "Cannot meet constraints with max-discard %" PRIu64, 563 s->max_discard); 564 goto out; 565 } 566 567 bdrv_debug_event(bs, BLKDBG_NONE); 568 569 ret = 0; 570 out: 571 if (ret < 0) { 572 g_free(s->config_file); 573 } 574 qemu_opts_del(opts); 575 return ret; 576 } 577 578 static int rule_check(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 579 BlkdebugIOType iotype) 580 { 581 BDRVBlkdebugState *s = bs->opaque; 582 BlkdebugRule *rule = NULL; 583 int error; 584 bool immediately; 585 586 QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) { 587 uint64_t inject_offset = rule->options.inject.offset; 588 589 if ((inject_offset == -1 || 590 (bytes && inject_offset >= offset && 591 inject_offset < offset + bytes)) && 592 (rule->options.inject.iotype_mask & (1ull << iotype))) 593 { 594 break; 595 } 596 } 597 598 if (!rule || !rule->options.inject.error) { 599 return 0; 600 } 601 602 immediately = rule->options.inject.immediately; 603 error = rule->options.inject.error; 604 605 if (rule->options.inject.once) { 606 QSIMPLEQ_REMOVE(&s->active_rules, rule, BlkdebugRule, active_next); 607 remove_rule(rule); 608 } 609 610 if (!immediately) { 611 aio_co_schedule(qemu_get_current_aio_context(), qemu_coroutine_self()); 612 qemu_coroutine_yield(); 613 } 614 615 return -error; 616 } 617 618 static int coroutine_fn 619 blkdebug_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 620 QEMUIOVector *qiov, int flags) 621 { 622 int err; 623 624 /* Sanity check block layer guarantees */ 625 assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment)); 626 assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment)); 627 if (bs->bl.max_transfer) { 628 assert(bytes <= bs->bl.max_transfer); 629 } 630 631 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_READ); 632 if (err) { 633 return err; 634 } 635 636 return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); 637 } 638 639 static int coroutine_fn 640 blkdebug_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 641 QEMUIOVector *qiov, int flags) 642 { 643 int err; 644 645 /* Sanity check block layer guarantees */ 646 assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment)); 647 assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment)); 648 if (bs->bl.max_transfer) { 649 assert(bytes <= bs->bl.max_transfer); 650 } 651 652 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_WRITE); 653 if (err) { 654 return err; 655 } 656 657 return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags); 658 } 659 660 static int blkdebug_co_flush(BlockDriverState *bs) 661 { 662 int err = rule_check(bs, 0, 0, BLKDEBUG_IO_TYPE_FLUSH); 663 664 if (err) { 665 return err; 666 } 667 668 return bdrv_co_flush(bs->file->bs); 669 } 670 671 static int coroutine_fn blkdebug_co_pwrite_zeroes(BlockDriverState *bs, 672 int64_t offset, int bytes, 673 BdrvRequestFlags flags) 674 { 675 uint32_t align = MAX(bs->bl.request_alignment, 676 bs->bl.pwrite_zeroes_alignment); 677 int err; 678 679 /* Only pass through requests that are larger than requested 680 * preferred alignment (so that we test the fallback to writes on 681 * unaligned portions), and check that the block layer never hands 682 * us anything unaligned that crosses an alignment boundary. */ 683 if (bytes < align) { 684 assert(QEMU_IS_ALIGNED(offset, align) || 685 QEMU_IS_ALIGNED(offset + bytes, align) || 686 DIV_ROUND_UP(offset, align) == 687 DIV_ROUND_UP(offset + bytes, align)); 688 return -ENOTSUP; 689 } 690 assert(QEMU_IS_ALIGNED(offset, align)); 691 assert(QEMU_IS_ALIGNED(bytes, align)); 692 if (bs->bl.max_pwrite_zeroes) { 693 assert(bytes <= bs->bl.max_pwrite_zeroes); 694 } 695 696 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_WRITE_ZEROES); 697 if (err) { 698 return err; 699 } 700 701 return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags); 702 } 703 704 static int coroutine_fn blkdebug_co_pdiscard(BlockDriverState *bs, 705 int64_t offset, int bytes) 706 { 707 uint32_t align = bs->bl.pdiscard_alignment; 708 int err; 709 710 /* Only pass through requests that are larger than requested 711 * minimum alignment, and ensure that unaligned requests do not 712 * cross optimum discard boundaries. */ 713 if (bytes < bs->bl.request_alignment) { 714 assert(QEMU_IS_ALIGNED(offset, align) || 715 QEMU_IS_ALIGNED(offset + bytes, align) || 716 DIV_ROUND_UP(offset, align) == 717 DIV_ROUND_UP(offset + bytes, align)); 718 return -ENOTSUP; 719 } 720 assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment)); 721 assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment)); 722 if (align && bytes >= align) { 723 assert(QEMU_IS_ALIGNED(offset, align)); 724 assert(QEMU_IS_ALIGNED(bytes, align)); 725 } 726 if (bs->bl.max_pdiscard) { 727 assert(bytes <= bs->bl.max_pdiscard); 728 } 729 730 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_DISCARD); 731 if (err) { 732 return err; 733 } 734 735 return bdrv_co_pdiscard(bs->file, offset, bytes); 736 } 737 738 static int coroutine_fn blkdebug_co_block_status(BlockDriverState *bs, 739 bool want_zero, 740 int64_t offset, 741 int64_t bytes, 742 int64_t *pnum, 743 int64_t *map, 744 BlockDriverState **file) 745 { 746 int err; 747 748 assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment)); 749 750 err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_BLOCK_STATUS); 751 if (err) { 752 return err; 753 } 754 755 assert(bs->file && bs->file->bs); 756 *pnum = bytes; 757 *map = offset; 758 *file = bs->file->bs; 759 return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID; 760 } 761 762 static void blkdebug_close(BlockDriverState *bs) 763 { 764 BDRVBlkdebugState *s = bs->opaque; 765 BlkdebugRule *rule, *next; 766 int i; 767 768 for (i = 0; i < BLKDBG__MAX; i++) { 769 QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) { 770 remove_rule(rule); 771 } 772 } 773 774 g_free(s->config_file); 775 } 776 777 static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule) 778 { 779 BDRVBlkdebugState *s = bs->opaque; 780 BlkdebugSuspendedReq r; 781 782 r = (BlkdebugSuspendedReq) { 783 .co = qemu_coroutine_self(), 784 .tag = g_strdup(rule->options.suspend.tag), 785 }; 786 787 remove_rule(rule); 788 QLIST_INSERT_HEAD(&s->suspended_reqs, &r, next); 789 790 if (!qtest_enabled()) { 791 printf("blkdebug: Suspended request '%s'\n", r.tag); 792 } 793 qemu_coroutine_yield(); 794 if (!qtest_enabled()) { 795 printf("blkdebug: Resuming request '%s'\n", r.tag); 796 } 797 798 QLIST_REMOVE(&r, next); 799 g_free(r.tag); 800 } 801 802 static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule, 803 bool injected) 804 { 805 BDRVBlkdebugState *s = bs->opaque; 806 807 /* Only process rules for the current state */ 808 if (rule->state && rule->state != s->state) { 809 return injected; 810 } 811 812 /* Take the action */ 813 switch (rule->action) { 814 case ACTION_INJECT_ERROR: 815 if (!injected) { 816 QSIMPLEQ_INIT(&s->active_rules); 817 injected = true; 818 } 819 QSIMPLEQ_INSERT_HEAD(&s->active_rules, rule, active_next); 820 break; 821 822 case ACTION_SET_STATE: 823 s->new_state = rule->options.set_state.new_state; 824 break; 825 826 case ACTION_SUSPEND: 827 suspend_request(bs, rule); 828 break; 829 } 830 return injected; 831 } 832 833 static void blkdebug_debug_event(BlockDriverState *bs, BlkdebugEvent event) 834 { 835 BDRVBlkdebugState *s = bs->opaque; 836 struct BlkdebugRule *rule, *next; 837 bool injected; 838 839 assert((int)event >= 0 && event < BLKDBG__MAX); 840 841 injected = false; 842 s->new_state = s->state; 843 QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) { 844 injected = process_rule(bs, rule, injected); 845 } 846 s->state = s->new_state; 847 } 848 849 static int blkdebug_debug_breakpoint(BlockDriverState *bs, const char *event, 850 const char *tag) 851 { 852 BDRVBlkdebugState *s = bs->opaque; 853 struct BlkdebugRule *rule; 854 int blkdebug_event; 855 856 blkdebug_event = qapi_enum_parse(&BlkdebugEvent_lookup, event, -1, NULL); 857 if (blkdebug_event < 0) { 858 return -ENOENT; 859 } 860 861 rule = g_malloc(sizeof(*rule)); 862 *rule = (struct BlkdebugRule) { 863 .event = blkdebug_event, 864 .action = ACTION_SUSPEND, 865 .state = 0, 866 .options.suspend.tag = g_strdup(tag), 867 }; 868 869 QLIST_INSERT_HEAD(&s->rules[blkdebug_event], rule, next); 870 871 return 0; 872 } 873 874 static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag) 875 { 876 BDRVBlkdebugState *s = bs->opaque; 877 BlkdebugSuspendedReq *r, *next; 878 879 QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, next) { 880 if (!strcmp(r->tag, tag)) { 881 qemu_coroutine_enter(r->co); 882 return 0; 883 } 884 } 885 return -ENOENT; 886 } 887 888 static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs, 889 const char *tag) 890 { 891 BDRVBlkdebugState *s = bs->opaque; 892 BlkdebugSuspendedReq *r, *r_next; 893 BlkdebugRule *rule, *next; 894 int i, ret = -ENOENT; 895 896 for (i = 0; i < BLKDBG__MAX; i++) { 897 QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) { 898 if (rule->action == ACTION_SUSPEND && 899 !strcmp(rule->options.suspend.tag, tag)) { 900 remove_rule(rule); 901 ret = 0; 902 } 903 } 904 } 905 QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, r_next) { 906 if (!strcmp(r->tag, tag)) { 907 qemu_coroutine_enter(r->co); 908 ret = 0; 909 } 910 } 911 return ret; 912 } 913 914 static bool blkdebug_debug_is_suspended(BlockDriverState *bs, const char *tag) 915 { 916 BDRVBlkdebugState *s = bs->opaque; 917 BlkdebugSuspendedReq *r; 918 919 QLIST_FOREACH(r, &s->suspended_reqs, next) { 920 if (!strcmp(r->tag, tag)) { 921 return true; 922 } 923 } 924 return false; 925 } 926 927 static int64_t blkdebug_getlength(BlockDriverState *bs) 928 { 929 return bdrv_getlength(bs->file->bs); 930 } 931 932 static void blkdebug_refresh_filename(BlockDriverState *bs) 933 { 934 BDRVBlkdebugState *s = bs->opaque; 935 const QDictEntry *e; 936 int ret; 937 938 if (!bs->file->bs->exact_filename[0]) { 939 return; 940 } 941 942 for (e = qdict_first(bs->full_open_options); e; 943 e = qdict_next(bs->full_open_options, e)) 944 { 945 /* Real child options are under "image", but "x-image" may 946 * contain a filename */ 947 if (strcmp(qdict_entry_key(e), "config") && 948 strcmp(qdict_entry_key(e), "image") && 949 strcmp(qdict_entry_key(e), "x-image") && 950 strcmp(qdict_entry_key(e), "driver")) 951 { 952 return; 953 } 954 } 955 956 ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename), 957 "blkdebug:%s:%s", 958 s->config_file ?: "", bs->file->bs->exact_filename); 959 if (ret >= sizeof(bs->exact_filename)) { 960 /* An overflow makes the filename unusable, so do not report any */ 961 bs->exact_filename[0] = 0; 962 } 963 } 964 965 static void blkdebug_refresh_limits(BlockDriverState *bs, Error **errp) 966 { 967 BDRVBlkdebugState *s = bs->opaque; 968 969 if (s->align) { 970 bs->bl.request_alignment = s->align; 971 } 972 if (s->max_transfer) { 973 bs->bl.max_transfer = s->max_transfer; 974 } 975 if (s->opt_write_zero) { 976 bs->bl.pwrite_zeroes_alignment = s->opt_write_zero; 977 } 978 if (s->max_write_zero) { 979 bs->bl.max_pwrite_zeroes = s->max_write_zero; 980 } 981 if (s->opt_discard) { 982 bs->bl.pdiscard_alignment = s->opt_discard; 983 } 984 if (s->max_discard) { 985 bs->bl.max_pdiscard = s->max_discard; 986 } 987 } 988 989 static int blkdebug_reopen_prepare(BDRVReopenState *reopen_state, 990 BlockReopenQueue *queue, Error **errp) 991 { 992 return 0; 993 } 994 995 static void blkdebug_child_perm(BlockDriverState *bs, BdrvChild *c, 996 BdrvChildRole role, 997 BlockReopenQueue *reopen_queue, 998 uint64_t perm, uint64_t shared, 999 uint64_t *nperm, uint64_t *nshared) 1000 { 1001 BDRVBlkdebugState *s = bs->opaque; 1002 1003 bdrv_default_perms(bs, c, role, reopen_queue, 1004 perm, shared, nperm, nshared); 1005 1006 *nperm |= s->take_child_perms; 1007 *nshared &= ~s->unshare_child_perms; 1008 } 1009 1010 static const char *const blkdebug_strong_runtime_opts[] = { 1011 "config", 1012 "inject-error.", 1013 "set-state.", 1014 "align", 1015 "max-transfer", 1016 "opt-write-zero", 1017 "max-write-zero", 1018 "opt-discard", 1019 "max-discard", 1020 1021 NULL 1022 }; 1023 1024 static BlockDriver bdrv_blkdebug = { 1025 .format_name = "blkdebug", 1026 .protocol_name = "blkdebug", 1027 .instance_size = sizeof(BDRVBlkdebugState), 1028 .is_filter = true, 1029 1030 .bdrv_parse_filename = blkdebug_parse_filename, 1031 .bdrv_file_open = blkdebug_open, 1032 .bdrv_close = blkdebug_close, 1033 .bdrv_reopen_prepare = blkdebug_reopen_prepare, 1034 .bdrv_child_perm = blkdebug_child_perm, 1035 1036 .bdrv_getlength = blkdebug_getlength, 1037 .bdrv_refresh_filename = blkdebug_refresh_filename, 1038 .bdrv_refresh_limits = blkdebug_refresh_limits, 1039 1040 .bdrv_co_preadv = blkdebug_co_preadv, 1041 .bdrv_co_pwritev = blkdebug_co_pwritev, 1042 .bdrv_co_flush_to_disk = blkdebug_co_flush, 1043 .bdrv_co_pwrite_zeroes = blkdebug_co_pwrite_zeroes, 1044 .bdrv_co_pdiscard = blkdebug_co_pdiscard, 1045 .bdrv_co_block_status = blkdebug_co_block_status, 1046 1047 .bdrv_debug_event = blkdebug_debug_event, 1048 .bdrv_debug_breakpoint = blkdebug_debug_breakpoint, 1049 .bdrv_debug_remove_breakpoint 1050 = blkdebug_debug_remove_breakpoint, 1051 .bdrv_debug_resume = blkdebug_debug_resume, 1052 .bdrv_debug_is_suspended = blkdebug_debug_is_suspended, 1053 1054 .strong_runtime_opts = blkdebug_strong_runtime_opts, 1055 }; 1056 1057 static void bdrv_blkdebug_init(void) 1058 { 1059 bdrv_register(&bdrv_blkdebug); 1060 } 1061 1062 block_init(bdrv_blkdebug_init); 1063