| 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-io.h" |
| 31 | #include "block/block_int.h" |
| 32 | #include "block/qdict.h" |
| 33 | #include "qemu/module.h" |
| 34 | #include "qemu/option.h" |
| 35 | #include "qapi/qapi-visit-block-core.h" |
| 36 | #include "qobject/qdict.h" |
| 37 | #include "qobject/qlist.h" |
| 38 | #include "qobject/qstring.h" |
| 39 | #include "qapi/qobject-input-visitor.h" |
| 40 | #include "system/qtest.h" |
| 41 | |
| 42 | /* All APIs are thread-safe */ |
| 43 | |
| 44 | typedef struct BDRVBlkdebugState { |
| 45 | /* IN: initialized in blkdebug_open() and never changed */ |
| 46 | uint64_t align; |
| 47 | uint64_t max_transfer; |
| 48 | uint64_t opt_write_zero; |
| 49 | uint64_t max_write_zero; |
| 50 | uint64_t opt_discard; |
| 51 | uint64_t max_discard; |
| 52 | char *config_file; /* For blkdebug_refresh_filename() */ |
| 53 | /* initialized in blkdebug_parse_perms() */ |
| 54 | uint64_t take_child_perms; |
| 55 | uint64_t unshare_child_perms; |
| 56 | |
| 57 | /* State. Protected by lock */ |
| 58 | int state; |
| 59 | QLIST_HEAD(, BlkdebugRule) rules[BLKDBG__MAX]; |
| 60 | QSIMPLEQ_HEAD(, BlkdebugRule) active_rules; |
| 61 | QLIST_HEAD(, BlkdebugSuspendedReq) suspended_reqs; |
| 62 | QemuMutex lock; |
| 63 | } BDRVBlkdebugState; |
| 64 | |
| 65 | typedef struct BlkdebugAIOCB { |
| 66 | BlockAIOCB common; |
| 67 | int ret; |
| 68 | } BlkdebugAIOCB; |
| 69 | |
| 70 | typedef struct BlkdebugSuspendedReq { |
| 71 | /* IN: initialized in suspend_request() */ |
| 72 | Coroutine *co; |
| 73 | char *tag; |
| 74 | |
| 75 | /* List entry protected BDRVBlkdebugState's lock */ |
| 76 | QLIST_ENTRY(BlkdebugSuspendedReq) next; |
| 77 | } BlkdebugSuspendedReq; |
| 78 | |
| 79 | enum { |
| 80 | ACTION_INJECT_ERROR, |
| 81 | ACTION_SET_STATE, |
| 82 | ACTION_SUSPEND, |
| 83 | ACTION__MAX, |
| 84 | }; |
| 85 | |
| 86 | typedef struct BlkdebugRule { |
| 87 | /* IN: initialized in add_rule() or blkdebug_debug_breakpoint() */ |
| 88 | BlkdebugEvent event; |
| 89 | int action; |
| 90 | int state; |
| 91 | union { |
| 92 | struct { |
| 93 | uint64_t iotype_mask; |
| 94 | int error; |
| 95 | int immediately; |
| 96 | int once; |
| 97 | int64_t offset; |
| 98 | int64_t delay_ns; |
| 99 | } inject; |
| 100 | struct { |
| 101 | int new_state; |
| 102 | } set_state; |
| 103 | struct { |
| 104 | char *tag; |
| 105 | } suspend; |
| 106 | } options; |
| 107 | |
| 108 | /* List entries protected BDRVBlkdebugState's lock */ |
| 109 | QLIST_ENTRY(BlkdebugRule) next; |
| 110 | QSIMPLEQ_ENTRY(BlkdebugRule) active_next; |
| 111 | } BlkdebugRule; |
| 112 | |
| 113 | QEMU_BUILD_BUG_MSG(BLKDEBUG_IO_TYPE__MAX > 64, |
| 114 | "BlkdebugIOType mask does not fit into an uint64_t"); |
| 115 | |
| 116 | static QemuOptsList inject_error_opts = { |
| 117 | .name = "inject-error", |
| 118 | .head = QTAILQ_HEAD_INITIALIZER(inject_error_opts.head), |
| 119 | .desc = { |
| 120 | { |
| 121 | .name = "event", |
| 122 | .type = QEMU_OPT_STRING, |
| 123 | }, |
| 124 | { |
| 125 | .name = "state", |
| 126 | .type = QEMU_OPT_NUMBER, |
| 127 | }, |
| 128 | { |
| 129 | .name = "iotype", |
| 130 | .type = QEMU_OPT_STRING, |
| 131 | }, |
| 132 | { |
| 133 | .name = "errno", |
| 134 | .type = QEMU_OPT_NUMBER, |
| 135 | }, |
| 136 | { |
| 137 | .name = "sector", |
| 138 | .type = QEMU_OPT_NUMBER, |
| 139 | }, |
| 140 | { |
| 141 | .name = "once", |
| 142 | .type = QEMU_OPT_BOOL, |
| 143 | }, |
| 144 | { |
| 145 | .name = "immediately", |
| 146 | .type = QEMU_OPT_BOOL, |
| 147 | }, |
| 148 | { |
| 149 | .name = "delay-ns", |
| 150 | .type = QEMU_OPT_NUMBER, |
| 151 | }, |
| 152 | { /* end of list */ } |
| 153 | }, |
| 154 | }; |
| 155 | |
| 156 | static QemuOptsList set_state_opts = { |
| 157 | .name = "set-state", |
| 158 | .head = QTAILQ_HEAD_INITIALIZER(set_state_opts.head), |
| 159 | .desc = { |
| 160 | { |
| 161 | .name = "event", |
| 162 | .type = QEMU_OPT_STRING, |
| 163 | }, |
| 164 | { |
| 165 | .name = "state", |
| 166 | .type = QEMU_OPT_NUMBER, |
| 167 | }, |
| 168 | { |
| 169 | .name = "new_state", |
| 170 | .type = QEMU_OPT_NUMBER, |
| 171 | }, |
| 172 | { /* end of list */ } |
| 173 | }, |
| 174 | }; |
| 175 | |
| 176 | static QemuOptsList *config_groups[] = { |
| 177 | &inject_error_opts, |
| 178 | &set_state_opts, |
| 179 | NULL |
| 180 | }; |
| 181 | |
| 182 | struct add_rule_data { |
| 183 | BDRVBlkdebugState *s; |
| 184 | int action; |
| 185 | }; |
| 186 | |
| 187 | static int add_rule(void *opaque, QemuOpts *opts, Error **errp) |
| 188 | { |
| 189 | struct add_rule_data *d = opaque; |
| 190 | BDRVBlkdebugState *s = d->s; |
| 191 | const char *event_name; |
| 192 | int event; |
| 193 | struct BlkdebugRule *rule; |
| 194 | int64_t sector; |
| 195 | BlkdebugIOType iotype; |
| 196 | Error *local_error = NULL; |
| 197 | |
| 198 | /* Find the right event for the rule */ |
| 199 | event_name = qemu_opt_get(opts, "event"); |
| 200 | if (!event_name) { |
| 201 | error_setg(errp, "Missing event name for rule"); |
| 202 | return -1; |
| 203 | } |
| 204 | event = qapi_enum_parse(&BlkdebugEvent_lookup, event_name, -1, errp); |
| 205 | if (event < 0) { |
| 206 | return -1; |
| 207 | } |
| 208 | |
| 209 | /* Set attributes common for all actions */ |
| 210 | rule = g_malloc0(sizeof(*rule)); |
| 211 | *rule = (struct BlkdebugRule) { |
| 212 | .event = event, |
| 213 | .action = d->action, |
| 214 | .state = qemu_opt_get_number(opts, "state", 0), |
| 215 | }; |
| 216 | |
| 217 | /* Parse action-specific options */ |
| 218 | switch (d->action) { |
| 219 | case ACTION_INJECT_ERROR: |
| 220 | rule->options.inject.error = qemu_opt_get_number(opts, "errno", EIO); |
| 221 | rule->options.inject.once = qemu_opt_get_bool(opts, "once", 0); |
| 222 | rule->options.inject.immediately = |
| 223 | qemu_opt_get_bool(opts, "immediately", 0); |
| 224 | rule->options.inject.delay_ns = |
| 225 | qemu_opt_get_number(opts, "delay-ns", 0); |
| 226 | sector = qemu_opt_get_number(opts, "sector", -1); |
| 227 | rule->options.inject.offset = |
| 228 | sector == -1 ? -1 : sector * BDRV_SECTOR_SIZE; |
| 229 | |
| 230 | iotype = qapi_enum_parse(&BlkdebugIOType_lookup, |
| 231 | qemu_opt_get(opts, "iotype"), |
| 232 | BLKDEBUG_IO_TYPE__MAX, &local_error); |
| 233 | if (local_error) { |
| 234 | error_propagate(errp, local_error); |
| 235 | g_free(rule); |
| 236 | return -1; |
| 237 | } |
| 238 | if (iotype != BLKDEBUG_IO_TYPE__MAX) { |
| 239 | rule->options.inject.iotype_mask = (1ull << iotype); |
| 240 | } else { |
| 241 | /* Apply the default */ |
| 242 | rule->options.inject.iotype_mask = |
| 243 | (1ull << BLKDEBUG_IO_TYPE_READ) |
| 244 | | (1ull << BLKDEBUG_IO_TYPE_WRITE) |
| 245 | | (1ull << BLKDEBUG_IO_TYPE_WRITE_ZEROES) |
| 246 | | (1ull << BLKDEBUG_IO_TYPE_DISCARD) |
| 247 | | (1ull << BLKDEBUG_IO_TYPE_FLUSH); |
| 248 | } |
| 249 | |
| 250 | break; |
| 251 | |
| 252 | case ACTION_SET_STATE: |
| 253 | rule->options.set_state.new_state = |
| 254 | qemu_opt_get_number(opts, "new_state", 0); |
| 255 | break; |
| 256 | |
| 257 | case ACTION_SUSPEND: |
| 258 | rule->options.suspend.tag = |
| 259 | g_strdup(qemu_opt_get(opts, "tag")); |
| 260 | break; |
| 261 | }; |
| 262 | |
| 263 | /* Add the rule */ |
| 264 | qemu_mutex_lock(&s->lock); |
| 265 | QLIST_INSERT_HEAD(&s->rules[event], rule, next); |
| 266 | qemu_mutex_unlock(&s->lock); |
| 267 | |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | /* Called with lock held or from .bdrv_close */ |
| 272 | static void remove_rule(BlkdebugRule *rule) |
| 273 | { |
| 274 | switch (rule->action) { |
| 275 | case ACTION_INJECT_ERROR: |
| 276 | case ACTION_SET_STATE: |
| 277 | break; |
| 278 | case ACTION_SUSPEND: |
| 279 | g_free(rule->options.suspend.tag); |
| 280 | break; |
| 281 | } |
| 282 | |
| 283 | QLIST_REMOVE(rule, next); |
| 284 | g_free(rule); |
| 285 | } |
| 286 | |
| 287 | static int read_config(BDRVBlkdebugState *s, const char *filename, |
| 288 | QDict *options, Error **errp) |
| 289 | { |
| 290 | FILE *f = NULL; |
| 291 | int ret; |
| 292 | struct add_rule_data d; |
| 293 | Error *local_err = NULL; |
| 294 | |
| 295 | if (filename) { |
| 296 | f = fopen(filename, "r"); |
| 297 | if (f == NULL) { |
| 298 | error_setg_file_open(errp, errno, filename); |
| 299 | return -errno; |
| 300 | } |
| 301 | |
| 302 | ret = qemu_config_parse(f, config_groups, filename, errp); |
| 303 | if (ret < 0) { |
| 304 | goto fail; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | if (!qemu_config_parse_qdict(options, config_groups, errp)) { |
| 309 | ret = -EINVAL; |
| 310 | goto fail; |
| 311 | } |
| 312 | |
| 313 | d.s = s; |
| 314 | d.action = ACTION_INJECT_ERROR; |
| 315 | qemu_opts_foreach(&inject_error_opts, add_rule, &d, &local_err); |
| 316 | if (local_err) { |
| 317 | error_propagate(errp, local_err); |
| 318 | ret = -EINVAL; |
| 319 | goto fail; |
| 320 | } |
| 321 | |
| 322 | d.action = ACTION_SET_STATE; |
| 323 | qemu_opts_foreach(&set_state_opts, add_rule, &d, &local_err); |
| 324 | if (local_err) { |
| 325 | error_propagate(errp, local_err); |
| 326 | ret = -EINVAL; |
| 327 | goto fail; |
| 328 | } |
| 329 | |
| 330 | ret = 0; |
| 331 | fail: |
| 332 | qemu_opts_reset(&inject_error_opts); |
| 333 | qemu_opts_reset(&set_state_opts); |
| 334 | if (f) { |
| 335 | fclose(f); |
| 336 | } |
| 337 | return ret; |
| 338 | } |
| 339 | |
| 340 | /* Valid blkdebug filenames look like blkdebug:path/to/config:path/to/image */ |
| 341 | static void blkdebug_parse_filename(const char *filename, QDict *options, |
| 342 | Error **errp) |
| 343 | { |
| 344 | const char *c; |
| 345 | |
| 346 | /* Parse the blkdebug: prefix */ |
| 347 | if (!strstart(filename, "blkdebug:", &filename)) { |
| 348 | /* There was no prefix; therefore, all options have to be already |
| 349 | present in the QDict (except for the filename) */ |
| 350 | qdict_put_str(options, "x-image", filename); |
| 351 | return; |
| 352 | } |
| 353 | |
| 354 | /* Parse config file path */ |
| 355 | c = strchr(filename, ':'); |
| 356 | if (c == NULL) { |
| 357 | error_setg(errp, "blkdebug requires both config file and image path"); |
| 358 | return; |
| 359 | } |
| 360 | |
| 361 | if (c != filename) { |
| 362 | QString *config_path; |
| 363 | config_path = qstring_from_substr(filename, 0, c - filename); |
| 364 | qdict_put(options, "config", config_path); |
| 365 | } |
| 366 | |
| 367 | /* TODO Allow multi-level nesting and set file.filename here */ |
| 368 | filename = c + 1; |
| 369 | qdict_put_str(options, "x-image", filename); |
| 370 | } |
| 371 | |
| 372 | static int blkdebug_parse_perm_list(uint64_t *dest, QDict *options, |
| 373 | const char *prefix, Error **errp) |
| 374 | { |
| 375 | int ret = 0; |
| 376 | QDict *subqdict = NULL; |
| 377 | QObject *crumpled_subqdict = NULL; |
| 378 | Visitor *v = NULL; |
| 379 | BlockPermissionList *perm_list = NULL, *element; |
| 380 | |
| 381 | *dest = 0; |
| 382 | |
| 383 | qdict_extract_subqdict(options, &subqdict, prefix); |
| 384 | if (!qdict_size(subqdict)) { |
| 385 | goto out; |
| 386 | } |
| 387 | |
| 388 | crumpled_subqdict = qdict_crumple(subqdict, errp); |
| 389 | if (!crumpled_subqdict) { |
| 390 | ret = -EINVAL; |
| 391 | goto out; |
| 392 | } |
| 393 | |
| 394 | v = qobject_input_visitor_new(crumpled_subqdict); |
| 395 | if (!visit_type_BlockPermissionList(v, NULL, &perm_list, errp)) { |
| 396 | ret = -EINVAL; |
| 397 | goto out; |
| 398 | } |
| 399 | |
| 400 | for (element = perm_list; element; element = element->next) { |
| 401 | *dest |= bdrv_qapi_perm_to_blk_perm(element->value); |
| 402 | } |
| 403 | |
| 404 | out: |
| 405 | qapi_free_BlockPermissionList(perm_list); |
| 406 | visit_free(v); |
| 407 | qobject_unref(subqdict); |
| 408 | qobject_unref(crumpled_subqdict); |
| 409 | return ret; |
| 410 | } |
| 411 | |
| 412 | static int blkdebug_parse_perms(BDRVBlkdebugState *s, QDict *options, |
| 413 | Error **errp) |
| 414 | { |
| 415 | int ret; |
| 416 | |
| 417 | ret = blkdebug_parse_perm_list(&s->take_child_perms, options, |
| 418 | "take-child-perms.", errp); |
| 419 | if (ret < 0) { |
| 420 | return ret; |
| 421 | } |
| 422 | |
| 423 | ret = blkdebug_parse_perm_list(&s->unshare_child_perms, options, |
| 424 | "unshare-child-perms.", errp); |
| 425 | if (ret < 0) { |
| 426 | return ret; |
| 427 | } |
| 428 | |
| 429 | return 0; |
| 430 | } |
| 431 | |
| 432 | static QemuOptsList runtime_opts = { |
| 433 | .name = "blkdebug", |
| 434 | .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), |
| 435 | .desc = { |
| 436 | { |
| 437 | .name = "config", |
| 438 | .type = QEMU_OPT_STRING, |
| 439 | .help = "Path to the configuration file", |
| 440 | }, |
| 441 | { |
| 442 | .name = "x-image", |
| 443 | .type = QEMU_OPT_STRING, |
| 444 | .help = "[internal use only, will be removed]", |
| 445 | }, |
| 446 | { |
| 447 | .name = "align", |
| 448 | .type = QEMU_OPT_SIZE, |
| 449 | .help = "Required alignment in bytes", |
| 450 | }, |
| 451 | { |
| 452 | .name = "max-transfer", |
| 453 | .type = QEMU_OPT_SIZE, |
| 454 | .help = "Maximum transfer size in bytes", |
| 455 | }, |
| 456 | { |
| 457 | .name = "opt-write-zero", |
| 458 | .type = QEMU_OPT_SIZE, |
| 459 | .help = "Optimum write zero alignment in bytes", |
| 460 | }, |
| 461 | { |
| 462 | .name = "max-write-zero", |
| 463 | .type = QEMU_OPT_SIZE, |
| 464 | .help = "Maximum write zero size in bytes", |
| 465 | }, |
| 466 | { |
| 467 | .name = "opt-discard", |
| 468 | .type = QEMU_OPT_SIZE, |
| 469 | .help = "Optimum discard alignment in bytes", |
| 470 | }, |
| 471 | { |
| 472 | .name = "max-discard", |
| 473 | .type = QEMU_OPT_SIZE, |
| 474 | .help = "Maximum discard size in bytes", |
| 475 | }, |
| 476 | { /* end of list */ } |
| 477 | }, |
| 478 | }; |
| 479 | |
| 480 | static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags, |
| 481 | Error **errp) |
| 482 | { |
| 483 | BDRVBlkdebugState *s = bs->opaque; |
| 484 | QemuOpts *opts; |
| 485 | int ret; |
| 486 | uint64_t align; |
| 487 | |
| 488 | qemu_mutex_init(&s->lock); |
| 489 | opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); |
| 490 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
| 491 | ret = -EINVAL; |
| 492 | goto out; |
| 493 | } |
| 494 | |
| 495 | /* Read rules from config file or command line options */ |
| 496 | s->config_file = g_strdup(qemu_opt_get(opts, "config")); |
| 497 | ret = read_config(s, s->config_file, options, errp); |
| 498 | if (ret) { |
| 499 | goto out; |
| 500 | } |
| 501 | |
| 502 | /* Set initial state */ |
| 503 | s->state = 1; |
| 504 | |
| 505 | /* Parse permissions modifiers before opening the image file */ |
| 506 | ret = blkdebug_parse_perms(s, options, errp); |
| 507 | if (ret < 0) { |
| 508 | goto out; |
| 509 | } |
| 510 | |
| 511 | /* Open the image file */ |
| 512 | ret = bdrv_open_file_child(qemu_opt_get(opts, "x-image"), options, "image", |
| 513 | bs, errp); |
| 514 | if (ret < 0) { |
| 515 | goto out; |
| 516 | } |
| 517 | |
| 518 | bdrv_graph_rdlock_main_loop(); |
| 519 | |
| 520 | bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | |
| 521 | (BDRV_REQ_FUA & bs->file->bs->supported_write_flags); |
| 522 | bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | |
| 523 | ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & |
| 524 | bs->file->bs->supported_zero_flags); |
| 525 | ret = -EINVAL; |
| 526 | |
| 527 | /* Set alignment overrides */ |
| 528 | s->align = qemu_opt_get_size(opts, "align", 0); |
| 529 | if (s->align && (s->align >= INT_MAX || !is_power_of_2(s->align))) { |
| 530 | error_setg(errp, "Cannot meet constraints with align %" PRIu64, |
| 531 | s->align); |
| 532 | goto out_rdlock; |
| 533 | } |
| 534 | align = MAX(s->align, bs->file->bs->bl.request_alignment); |
| 535 | |
| 536 | s->max_transfer = qemu_opt_get_size(opts, "max-transfer", 0); |
| 537 | if (s->max_transfer && |
| 538 | (s->max_transfer >= INT_MAX || |
| 539 | !QEMU_IS_ALIGNED(s->max_transfer, align))) { |
| 540 | error_setg(errp, "Cannot meet constraints with max-transfer %" PRIu64, |
| 541 | s->max_transfer); |
| 542 | goto out_rdlock; |
| 543 | } |
| 544 | |
| 545 | s->opt_write_zero = qemu_opt_get_size(opts, "opt-write-zero", 0); |
| 546 | if (s->opt_write_zero && |
| 547 | (s->opt_write_zero >= INT_MAX || |
| 548 | !QEMU_IS_ALIGNED(s->opt_write_zero, align))) { |
| 549 | error_setg(errp, "Cannot meet constraints with opt-write-zero %" PRIu64, |
| 550 | s->opt_write_zero); |
| 551 | goto out_rdlock; |
| 552 | } |
| 553 | |
| 554 | s->max_write_zero = qemu_opt_get_size(opts, "max-write-zero", 0); |
| 555 | if (s->max_write_zero && |
| 556 | (s->max_write_zero >= INT_MAX || |
| 557 | !QEMU_IS_ALIGNED(s->max_write_zero, |
| 558 | MAX(s->opt_write_zero, align)))) { |
| 559 | error_setg(errp, "Cannot meet constraints with max-write-zero %" PRIu64, |
| 560 | s->max_write_zero); |
| 561 | goto out_rdlock; |
| 562 | } |
| 563 | |
| 564 | s->opt_discard = qemu_opt_get_size(opts, "opt-discard", 0); |
| 565 | if (s->opt_discard && |
| 566 | (s->opt_discard >= INT_MAX || |
| 567 | !QEMU_IS_ALIGNED(s->opt_discard, align))) { |
| 568 | error_setg(errp, "Cannot meet constraints with opt-discard %" PRIu64, |
| 569 | s->opt_discard); |
| 570 | goto out_rdlock; |
| 571 | } |
| 572 | |
| 573 | s->max_discard = qemu_opt_get_size(opts, "max-discard", 0); |
| 574 | if (s->max_discard && |
| 575 | (s->max_discard >= INT_MAX || |
| 576 | !QEMU_IS_ALIGNED(s->max_discard, |
| 577 | MAX(s->opt_discard, align)))) { |
| 578 | error_setg(errp, "Cannot meet constraints with max-discard %" PRIu64, |
| 579 | s->max_discard); |
| 580 | goto out_rdlock; |
| 581 | } |
| 582 | |
| 583 | bdrv_debug_event(bs, BLKDBG_NONE); |
| 584 | |
| 585 | ret = 0; |
| 586 | out_rdlock: |
| 587 | bdrv_graph_rdunlock_main_loop(); |
| 588 | out: |
| 589 | if (ret < 0) { |
| 590 | qemu_mutex_destroy(&s->lock); |
| 591 | g_free(s->config_file); |
| 592 | } |
| 593 | qemu_opts_del(opts); |
| 594 | return ret; |
| 595 | } |
| 596 | |
| 597 | static int coroutine_fn rule_check(BlockDriverState *bs, uint64_t offset, |
| 598 | uint64_t bytes, BlkdebugIOType iotype) |
| 599 | { |
| 600 | BDRVBlkdebugState *s = bs->opaque; |
| 601 | BlkdebugRule *rule; |
| 602 | int error; |
| 603 | bool immediately; |
| 604 | int64_t delay_ns; |
| 605 | |
| 606 | qemu_mutex_lock(&s->lock); |
| 607 | QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) { |
| 608 | uint64_t inject_offset = rule->options.inject.offset; |
| 609 | |
| 610 | if ((inject_offset == -1 || |
| 611 | (bytes && inject_offset >= offset && |
| 612 | inject_offset < offset + bytes)) && |
| 613 | (rule->options.inject.iotype_mask & (1ull << iotype))) |
| 614 | { |
| 615 | break; |
| 616 | } |
| 617 | } |
| 618 | |
| 619 | if (!rule) { |
| 620 | qemu_mutex_unlock(&s->lock); |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | immediately = rule->options.inject.immediately; |
| 625 | error = rule->options.inject.error; |
| 626 | delay_ns = rule->options.inject.delay_ns; |
| 627 | |
| 628 | if (rule->options.inject.once) { |
| 629 | QSIMPLEQ_REMOVE(&s->active_rules, rule, BlkdebugRule, active_next); |
| 630 | remove_rule(rule); |
| 631 | } |
| 632 | |
| 633 | qemu_mutex_unlock(&s->lock); |
| 634 | |
| 635 | if (delay_ns) { |
| 636 | qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, delay_ns); |
| 637 | } |
| 638 | if (!immediately) { |
| 639 | aio_co_schedule(qemu_get_current_aio_context(), qemu_coroutine_self()); |
| 640 | qemu_coroutine_yield(); |
| 641 | } |
| 642 | |
| 643 | return -error; |
| 644 | } |
| 645 | |
| 646 | static int coroutine_fn GRAPH_RDLOCK |
| 647 | blkdebug_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 648 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 649 | { |
| 650 | int err; |
| 651 | |
| 652 | /* Sanity check block layer guarantees */ |
| 653 | assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment)); |
| 654 | assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment)); |
| 655 | if (bs->bl.max_transfer) { |
| 656 | assert(bytes <= bs->bl.max_transfer); |
| 657 | } |
| 658 | |
| 659 | err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_READ); |
| 660 | if (err) { |
| 661 | return err; |
| 662 | } |
| 663 | |
| 664 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); |
| 665 | } |
| 666 | |
| 667 | static int coroutine_fn GRAPH_RDLOCK |
| 668 | blkdebug_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 669 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 670 | { |
| 671 | int err; |
| 672 | |
| 673 | /* Sanity check block layer guarantees */ |
| 674 | assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment)); |
| 675 | assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment)); |
| 676 | if (bs->bl.max_transfer) { |
| 677 | assert(bytes <= bs->bl.max_transfer); |
| 678 | } |
| 679 | |
| 680 | err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_WRITE); |
| 681 | if (err) { |
| 682 | return err; |
| 683 | } |
| 684 | |
| 685 | return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags); |
| 686 | } |
| 687 | |
| 688 | static int GRAPH_RDLOCK coroutine_fn blkdebug_co_flush(BlockDriverState *bs) |
| 689 | { |
| 690 | int err = rule_check(bs, 0, 0, BLKDEBUG_IO_TYPE_FLUSH); |
| 691 | |
| 692 | if (err) { |
| 693 | return err; |
| 694 | } |
| 695 | |
| 696 | return bdrv_co_flush(bs->file->bs); |
| 697 | } |
| 698 | |
| 699 | static int coroutine_fn GRAPH_RDLOCK |
| 700 | blkdebug_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 701 | BdrvRequestFlags flags) |
| 702 | { |
| 703 | uint32_t align = MAX(bs->bl.request_alignment, |
| 704 | bs->bl.pwrite_zeroes_alignment); |
| 705 | int err; |
| 706 | |
| 707 | /* Only pass through requests that are larger than requested |
| 708 | * preferred alignment (so that we test the fallback to writes on |
| 709 | * unaligned portions), and check that the block layer never hands |
| 710 | * us anything unaligned that crosses an alignment boundary. */ |
| 711 | if (bytes < align) { |
| 712 | assert(QEMU_IS_ALIGNED(offset, align) || |
| 713 | QEMU_IS_ALIGNED(offset + bytes, align) || |
| 714 | DIV_ROUND_UP(offset, align) == |
| 715 | DIV_ROUND_UP(offset + bytes, align)); |
| 716 | return -ENOTSUP; |
| 717 | } |
| 718 | assert(QEMU_IS_ALIGNED(offset, align)); |
| 719 | assert(QEMU_IS_ALIGNED(bytes, align)); |
| 720 | if (bs->bl.max_pwrite_zeroes) { |
| 721 | assert(bytes <= bs->bl.max_pwrite_zeroes); |
| 722 | } |
| 723 | |
| 724 | err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_WRITE_ZEROES); |
| 725 | if (err) { |
| 726 | return err; |
| 727 | } |
| 728 | |
| 729 | return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags); |
| 730 | } |
| 731 | |
| 732 | static int coroutine_fn GRAPH_RDLOCK |
| 733 | blkdebug_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) |
| 734 | { |
| 735 | uint32_t align = bs->bl.pdiscard_alignment; |
| 736 | int err; |
| 737 | |
| 738 | /* Only pass through requests that are larger than requested |
| 739 | * minimum alignment, and ensure that unaligned requests do not |
| 740 | * cross optimum discard boundaries. */ |
| 741 | if (bytes < bs->bl.request_alignment) { |
| 742 | assert(QEMU_IS_ALIGNED(offset, align) || |
| 743 | QEMU_IS_ALIGNED(offset + bytes, align) || |
| 744 | DIV_ROUND_UP(offset, align) == |
| 745 | DIV_ROUND_UP(offset + bytes, align)); |
| 746 | return -ENOTSUP; |
| 747 | } |
| 748 | assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment)); |
| 749 | assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment)); |
| 750 | if (align && bytes >= align) { |
| 751 | assert(QEMU_IS_ALIGNED(offset, align)); |
| 752 | assert(QEMU_IS_ALIGNED(bytes, align)); |
| 753 | } |
| 754 | if (bs->bl.max_pdiscard) { |
| 755 | assert(bytes <= bs->bl.max_pdiscard); |
| 756 | } |
| 757 | |
| 758 | err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_DISCARD); |
| 759 | if (err) { |
| 760 | return err; |
| 761 | } |
| 762 | |
| 763 | return bdrv_co_pdiscard(bs->file, offset, bytes); |
| 764 | } |
| 765 | |
| 766 | static int coroutine_fn GRAPH_RDLOCK |
| 767 | blkdebug_co_block_status(BlockDriverState *bs, unsigned int mode, |
| 768 | int64_t offset, int64_t bytes, int64_t *pnum, |
| 769 | int64_t *map, BlockDriverState **file) |
| 770 | { |
| 771 | int err; |
| 772 | |
| 773 | assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment)); |
| 774 | |
| 775 | err = rule_check(bs, offset, bytes, BLKDEBUG_IO_TYPE_BLOCK_STATUS); |
| 776 | if (err) { |
| 777 | return err; |
| 778 | } |
| 779 | |
| 780 | assert(bs->file && bs->file->bs); |
| 781 | *pnum = bytes; |
| 782 | *map = offset; |
| 783 | *file = bs->file->bs; |
| 784 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID; |
| 785 | } |
| 786 | |
| 787 | static void blkdebug_close(BlockDriverState *bs) |
| 788 | { |
| 789 | BDRVBlkdebugState *s = bs->opaque; |
| 790 | BlkdebugRule *rule, *next; |
| 791 | int i; |
| 792 | |
| 793 | for (i = 0; i < BLKDBG__MAX; i++) { |
| 794 | QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) { |
| 795 | remove_rule(rule); |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | g_free(s->config_file); |
| 800 | qemu_mutex_destroy(&s->lock); |
| 801 | } |
| 802 | |
| 803 | /* Called with lock held. */ |
| 804 | static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule) |
| 805 | { |
| 806 | BDRVBlkdebugState *s = bs->opaque; |
| 807 | BlkdebugSuspendedReq *r; |
| 808 | |
| 809 | r = g_new(BlkdebugSuspendedReq, 1); |
| 810 | |
| 811 | r->co = qemu_coroutine_self(); |
| 812 | r->tag = g_strdup(rule->options.suspend.tag); |
| 813 | |
| 814 | remove_rule(rule); |
| 815 | QLIST_INSERT_HEAD(&s->suspended_reqs, r, next); |
| 816 | |
| 817 | if (!qtest_enabled()) { |
| 818 | printf("blkdebug: Suspended request '%s'\n", r->tag); |
| 819 | } |
| 820 | } |
| 821 | |
| 822 | /* Called with lock held. */ |
| 823 | static void process_rule(BlockDriverState *bs, struct BlkdebugRule *rule, |
| 824 | int *action_count, int *new_state) |
| 825 | { |
| 826 | BDRVBlkdebugState *s = bs->opaque; |
| 827 | |
| 828 | /* Only process rules for the current state */ |
| 829 | if (rule->state && rule->state != s->state) { |
| 830 | return; |
| 831 | } |
| 832 | |
| 833 | /* Take the action */ |
| 834 | action_count[rule->action]++; |
| 835 | switch (rule->action) { |
| 836 | case ACTION_INJECT_ERROR: |
| 837 | if (action_count[ACTION_INJECT_ERROR] == 1) { |
| 838 | QSIMPLEQ_INIT(&s->active_rules); |
| 839 | } |
| 840 | QSIMPLEQ_INSERT_HEAD(&s->active_rules, rule, active_next); |
| 841 | break; |
| 842 | |
| 843 | case ACTION_SET_STATE: |
| 844 | *new_state = rule->options.set_state.new_state; |
| 845 | break; |
| 846 | |
| 847 | case ACTION_SUSPEND: |
| 848 | suspend_request(bs, rule); |
| 849 | break; |
| 850 | } |
| 851 | } |
| 852 | |
| 853 | static void coroutine_fn |
| 854 | blkdebug_co_debug_event(BlockDriverState *bs, BlkdebugEvent event) |
| 855 | { |
| 856 | BDRVBlkdebugState *s = bs->opaque; |
| 857 | struct BlkdebugRule *rule, *next; |
| 858 | int new_state; |
| 859 | int actions_count[ACTION__MAX] = { 0 }; |
| 860 | |
| 861 | assert((int)event >= 0 && event < BLKDBG__MAX); |
| 862 | |
| 863 | WITH_QEMU_LOCK_GUARD(&s->lock) { |
| 864 | new_state = s->state; |
| 865 | QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) { |
| 866 | process_rule(bs, rule, actions_count, &new_state); |
| 867 | } |
| 868 | s->state = new_state; |
| 869 | } |
| 870 | |
| 871 | while (actions_count[ACTION_SUSPEND] > 0) { |
| 872 | qemu_coroutine_yield(); |
| 873 | actions_count[ACTION_SUSPEND]--; |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | static int blkdebug_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 878 | const char *tag) |
| 879 | { |
| 880 | BDRVBlkdebugState *s = bs->opaque; |
| 881 | struct BlkdebugRule *rule; |
| 882 | int blkdebug_event; |
| 883 | |
| 884 | blkdebug_event = qapi_enum_parse(&BlkdebugEvent_lookup, event, -1, NULL); |
| 885 | if (blkdebug_event < 0) { |
| 886 | return -ENOENT; |
| 887 | } |
| 888 | |
| 889 | rule = g_malloc(sizeof(*rule)); |
| 890 | *rule = (struct BlkdebugRule) { |
| 891 | .event = blkdebug_event, |
| 892 | .action = ACTION_SUSPEND, |
| 893 | .state = 0, |
| 894 | .options.suspend.tag = g_strdup(tag), |
| 895 | }; |
| 896 | |
| 897 | qemu_mutex_lock(&s->lock); |
| 898 | QLIST_INSERT_HEAD(&s->rules[blkdebug_event], rule, next); |
| 899 | qemu_mutex_unlock(&s->lock); |
| 900 | |
| 901 | return 0; |
| 902 | } |
| 903 | |
| 904 | /* Called with lock held. May temporarily release lock. */ |
| 905 | static int resume_req_by_tag(BDRVBlkdebugState *s, const char *tag, bool all) |
| 906 | { |
| 907 | BlkdebugSuspendedReq *r; |
| 908 | |
| 909 | retry: |
| 910 | /* |
| 911 | * No need for _SAFE, since a different coroutine can remove another node |
| 912 | * (not the current one) in this list, and when the current one is removed |
| 913 | * the iteration starts back from beginning anyways. |
| 914 | */ |
| 915 | QLIST_FOREACH(r, &s->suspended_reqs, next) { |
| 916 | if (!strcmp(r->tag, tag)) { |
| 917 | Coroutine *co = r->co; |
| 918 | |
| 919 | if (!qtest_enabled()) { |
| 920 | printf("blkdebug: Resuming request '%s'\n", r->tag); |
| 921 | } |
| 922 | |
| 923 | QLIST_REMOVE(r, next); |
| 924 | g_free(r->tag); |
| 925 | g_free(r); |
| 926 | |
| 927 | qemu_mutex_unlock(&s->lock); |
| 928 | qemu_coroutine_enter(co); |
| 929 | qemu_mutex_lock(&s->lock); |
| 930 | |
| 931 | if (all) { |
| 932 | goto retry; |
| 933 | } |
| 934 | return 0; |
| 935 | } |
| 936 | } |
| 937 | return -ENOENT; |
| 938 | } |
| 939 | |
| 940 | static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag) |
| 941 | { |
| 942 | BDRVBlkdebugState *s = bs->opaque; |
| 943 | QEMU_LOCK_GUARD(&s->lock); |
| 944 | return resume_req_by_tag(s, tag, false); |
| 945 | } |
| 946 | |
| 947 | static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs, |
| 948 | const char *tag) |
| 949 | { |
| 950 | BDRVBlkdebugState *s = bs->opaque; |
| 951 | BlkdebugRule *rule, *next; |
| 952 | int i, ret = -ENOENT; |
| 953 | |
| 954 | QEMU_LOCK_GUARD(&s->lock); |
| 955 | for (i = 0; i < BLKDBG__MAX; i++) { |
| 956 | QLIST_FOREACH_SAFE(rule, &s->rules[i], next, next) { |
| 957 | if (rule->action == ACTION_SUSPEND && |
| 958 | !strcmp(rule->options.suspend.tag, tag)) { |
| 959 | remove_rule(rule); |
| 960 | ret = 0; |
| 961 | } |
| 962 | } |
| 963 | } |
| 964 | if (resume_req_by_tag(s, tag, true) == 0) { |
| 965 | ret = 0; |
| 966 | } |
| 967 | return ret; |
| 968 | } |
| 969 | |
| 970 | static bool blkdebug_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 971 | { |
| 972 | BDRVBlkdebugState *s = bs->opaque; |
| 973 | BlkdebugSuspendedReq *r; |
| 974 | |
| 975 | QEMU_LOCK_GUARD(&s->lock); |
| 976 | QLIST_FOREACH(r, &s->suspended_reqs, next) { |
| 977 | if (!strcmp(r->tag, tag)) { |
| 978 | return true; |
| 979 | } |
| 980 | } |
| 981 | return false; |
| 982 | } |
| 983 | |
| 984 | static int64_t coroutine_fn GRAPH_RDLOCK |
| 985 | blkdebug_co_getlength(BlockDriverState *bs) |
| 986 | { |
| 987 | return bdrv_co_getlength(bs->file->bs); |
| 988 | } |
| 989 | |
| 990 | static void GRAPH_RDLOCK blkdebug_refresh_filename(BlockDriverState *bs) |
| 991 | { |
| 992 | BDRVBlkdebugState *s = bs->opaque; |
| 993 | const QDictEntry *e; |
| 994 | int ret; |
| 995 | |
| 996 | if (!bs->file->bs->exact_filename[0]) { |
| 997 | return; |
| 998 | } |
| 999 | |
| 1000 | for (e = qdict_first(bs->full_open_options); e; |
| 1001 | e = qdict_next(bs->full_open_options, e)) |
| 1002 | { |
| 1003 | /* Real child options are under "image", but "x-image" may |
| 1004 | * contain a filename */ |
| 1005 | if (strcmp(qdict_entry_key(e), "config") && |
| 1006 | strcmp(qdict_entry_key(e), "image") && |
| 1007 | strcmp(qdict_entry_key(e), "x-image") && |
| 1008 | strcmp(qdict_entry_key(e), "driver")) |
| 1009 | { |
| 1010 | return; |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| 1015 | "blkdebug:%s:%s", |
| 1016 | s->config_file ?: "", bs->file->bs->exact_filename); |
| 1017 | if (ret >= sizeof(bs->exact_filename)) { |
| 1018 | /* An overflow makes the filename unusable, so do not report any */ |
| 1019 | bs->exact_filename[0] = 0; |
| 1020 | } |
| 1021 | } |
| 1022 | |
| 1023 | static void blkdebug_refresh_limits(BlockDriverState *bs, Error **errp) |
| 1024 | { |
| 1025 | BDRVBlkdebugState *s = bs->opaque; |
| 1026 | |
| 1027 | if (s->align) { |
| 1028 | bs->bl.request_alignment = s->align; |
| 1029 | } |
| 1030 | if (s->max_transfer) { |
| 1031 | bs->bl.max_transfer = s->max_transfer; |
| 1032 | } |
| 1033 | if (s->opt_write_zero) { |
| 1034 | bs->bl.pwrite_zeroes_alignment = s->opt_write_zero; |
| 1035 | } |
| 1036 | if (s->max_write_zero) { |
| 1037 | bs->bl.max_pwrite_zeroes = s->max_write_zero; |
| 1038 | } |
| 1039 | if (s->opt_discard) { |
| 1040 | bs->bl.pdiscard_alignment = s->opt_discard; |
| 1041 | } |
| 1042 | if (s->max_discard) { |
| 1043 | bs->bl.max_pdiscard = s->max_discard; |
| 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | static int blkdebug_reopen_prepare(BDRVReopenState *reopen_state, |
| 1048 | BlockReopenQueue *queue, Error **errp) |
| 1049 | { |
| 1050 | return 0; |
| 1051 | } |
| 1052 | |
| 1053 | static void blkdebug_child_perm(BlockDriverState *bs, BdrvChild *c, |
| 1054 | BdrvChildRole role, |
| 1055 | BlockReopenQueue *reopen_queue, |
| 1056 | uint64_t perm, uint64_t shared, |
| 1057 | uint64_t *nperm, uint64_t *nshared) |
| 1058 | { |
| 1059 | BDRVBlkdebugState *s = bs->opaque; |
| 1060 | |
| 1061 | bdrv_default_perms(bs, c, role, reopen_queue, |
| 1062 | perm, shared, nperm, nshared); |
| 1063 | |
| 1064 | *nperm |= s->take_child_perms; |
| 1065 | *nshared &= ~s->unshare_child_perms; |
| 1066 | } |
| 1067 | |
| 1068 | static const char *const blkdebug_strong_runtime_opts[] = { |
| 1069 | "config", |
| 1070 | "inject-error.", |
| 1071 | "set-state.", |
| 1072 | "align", |
| 1073 | "max-transfer", |
| 1074 | "opt-write-zero", |
| 1075 | "max-write-zero", |
| 1076 | "opt-discard", |
| 1077 | "max-discard", |
| 1078 | |
| 1079 | NULL |
| 1080 | }; |
| 1081 | |
| 1082 | static BlockDriver bdrv_blkdebug = { |
| 1083 | .format_name = "blkdebug", |
| 1084 | .protocol_name = "blkdebug", |
| 1085 | .instance_size = sizeof(BDRVBlkdebugState), |
| 1086 | .is_filter = true, |
| 1087 | |
| 1088 | .bdrv_parse_filename = blkdebug_parse_filename, |
| 1089 | .bdrv_open = blkdebug_open, |
| 1090 | .bdrv_close = blkdebug_close, |
| 1091 | .bdrv_reopen_prepare = blkdebug_reopen_prepare, |
| 1092 | .bdrv_child_perm = blkdebug_child_perm, |
| 1093 | |
| 1094 | .bdrv_co_getlength = blkdebug_co_getlength, |
| 1095 | .bdrv_refresh_filename = blkdebug_refresh_filename, |
| 1096 | .bdrv_refresh_limits = blkdebug_refresh_limits, |
| 1097 | |
| 1098 | .bdrv_co_preadv = blkdebug_co_preadv, |
| 1099 | .bdrv_co_pwritev = blkdebug_co_pwritev, |
| 1100 | .bdrv_co_flush_to_disk = blkdebug_co_flush, |
| 1101 | .bdrv_co_pwrite_zeroes = blkdebug_co_pwrite_zeroes, |
| 1102 | .bdrv_co_pdiscard = blkdebug_co_pdiscard, |
| 1103 | .bdrv_co_block_status = blkdebug_co_block_status, |
| 1104 | |
| 1105 | .bdrv_co_debug_event = blkdebug_co_debug_event, |
| 1106 | .bdrv_debug_breakpoint = blkdebug_debug_breakpoint, |
| 1107 | .bdrv_debug_remove_breakpoint |
| 1108 | = blkdebug_debug_remove_breakpoint, |
| 1109 | .bdrv_debug_resume = blkdebug_debug_resume, |
| 1110 | .bdrv_debug_is_suspended = blkdebug_debug_is_suspended, |
| 1111 | |
| 1112 | .strong_runtime_opts = blkdebug_strong_runtime_opts, |
| 1113 | }; |
| 1114 | |
| 1115 | static void bdrv_blkdebug_init(void) |
| 1116 | { |
| 1117 | bdrv_register(&bdrv_blkdebug); |
| 1118 | } |
| 1119 | |
| 1120 | block_init(bdrv_blkdebug_init); |