1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "sysemu/block-backend.h" 34 #include "sysemu/blockdev.h" 35 #include "hw/block/block.h" 36 #include "block/blockjob.h" 37 #include "block/throttle-groups.h" 38 #include "monitor/monitor.h" 39 #include "qemu/error-report.h" 40 #include "qemu/option.h" 41 #include "qemu/config-file.h" 42 #include "qapi/qmp/types.h" 43 #include "qapi-visit.h" 44 #include "qapi/qmp/qerror.h" 45 #include "qapi/qmp-output-visitor.h" 46 #include "qapi/util.h" 47 #include "sysemu/sysemu.h" 48 #include "block/block_int.h" 49 #include "qmp-commands.h" 50 #include "trace.h" 51 #include "sysemu/arch_init.h" 52 53 static const char *const if_name[IF_COUNT] = { 54 [IF_NONE] = "none", 55 [IF_IDE] = "ide", 56 [IF_SCSI] = "scsi", 57 [IF_FLOPPY] = "floppy", 58 [IF_PFLASH] = "pflash", 59 [IF_MTD] = "mtd", 60 [IF_SD] = "sd", 61 [IF_VIRTIO] = "virtio", 62 [IF_XEN] = "xen", 63 }; 64 65 static int if_max_devs[IF_COUNT] = { 66 /* 67 * Do not change these numbers! They govern how drive option 68 * index maps to unit and bus. That mapping is ABI. 69 * 70 * All controllers used to imlement if=T drives need to support 71 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 72 * Otherwise, some index values map to "impossible" bus, unit 73 * values. 74 * 75 * For instance, if you change [IF_SCSI] to 255, -drive 76 * if=scsi,index=12 no longer means bus=1,unit=5, but 77 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 78 * the drive can't be set up. Regression. 79 */ 80 [IF_IDE] = 2, 81 [IF_SCSI] = 7, 82 }; 83 84 /** 85 * Boards may call this to offer board-by-board overrides 86 * of the default, global values. 87 */ 88 void override_max_devs(BlockInterfaceType type, int max_devs) 89 { 90 BlockBackend *blk; 91 DriveInfo *dinfo; 92 93 if (max_devs <= 0) { 94 return; 95 } 96 97 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 98 dinfo = blk_legacy_dinfo(blk); 99 if (dinfo->type == type) { 100 fprintf(stderr, "Cannot override units-per-bus property of" 101 " the %s interface, because a drive of that type has" 102 " already been added.\n", if_name[type]); 103 g_assert_not_reached(); 104 } 105 } 106 107 if_max_devs[type] = max_devs; 108 } 109 110 /* 111 * We automatically delete the drive when a device using it gets 112 * unplugged. Questionable feature, but we can't just drop it. 113 * Device models call blockdev_mark_auto_del() to schedule the 114 * automatic deletion, and generic qdev code calls blockdev_auto_del() 115 * when deletion is actually safe. 116 */ 117 void blockdev_mark_auto_del(BlockBackend *blk) 118 { 119 DriveInfo *dinfo = blk_legacy_dinfo(blk); 120 BlockDriverState *bs = blk_bs(blk); 121 AioContext *aio_context; 122 123 if (!dinfo) { 124 return; 125 } 126 127 aio_context = bdrv_get_aio_context(bs); 128 aio_context_acquire(aio_context); 129 130 if (bs->job) { 131 block_job_cancel(bs->job); 132 } 133 134 aio_context_release(aio_context); 135 136 dinfo->auto_del = 1; 137 } 138 139 void blockdev_auto_del(BlockBackend *blk) 140 { 141 DriveInfo *dinfo = blk_legacy_dinfo(blk); 142 143 if (dinfo && dinfo->auto_del) { 144 blk_unref(blk); 145 } 146 } 147 148 /** 149 * Returns the current mapping of how many units per bus 150 * a particular interface can support. 151 * 152 * A positive integer indicates n units per bus. 153 * 0 implies the mapping has not been established. 154 * -1 indicates an invalid BlockInterfaceType was given. 155 */ 156 int drive_get_max_devs(BlockInterfaceType type) 157 { 158 if (type >= IF_IDE && type < IF_COUNT) { 159 return if_max_devs[type]; 160 } 161 162 return -1; 163 } 164 165 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 166 { 167 int max_devs = if_max_devs[type]; 168 return max_devs ? index / max_devs : 0; 169 } 170 171 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 172 { 173 int max_devs = if_max_devs[type]; 174 return max_devs ? index % max_devs : index; 175 } 176 177 QemuOpts *drive_def(const char *optstr) 178 { 179 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 180 } 181 182 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 183 const char *optstr) 184 { 185 QemuOpts *opts; 186 187 opts = drive_def(optstr); 188 if (!opts) { 189 return NULL; 190 } 191 if (type != IF_DEFAULT) { 192 qemu_opt_set(opts, "if", if_name[type], &error_abort); 193 } 194 if (index >= 0) { 195 qemu_opt_set_number(opts, "index", index, &error_abort); 196 } 197 if (file) 198 qemu_opt_set(opts, "file", file, &error_abort); 199 return opts; 200 } 201 202 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 203 { 204 BlockBackend *blk; 205 DriveInfo *dinfo; 206 207 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 208 dinfo = blk_legacy_dinfo(blk); 209 if (dinfo && dinfo->type == type 210 && dinfo->bus == bus && dinfo->unit == unit) { 211 return dinfo; 212 } 213 } 214 215 return NULL; 216 } 217 218 bool drive_check_orphaned(void) 219 { 220 BlockBackend *blk; 221 DriveInfo *dinfo; 222 bool rs = false; 223 224 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 225 dinfo = blk_legacy_dinfo(blk); 226 /* If dinfo->bdrv->dev is NULL, it has no device attached. */ 227 /* Unless this is a default drive, this may be an oversight. */ 228 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 229 dinfo->type != IF_NONE) { 230 fprintf(stderr, "Warning: Orphaned drive without device: " 231 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n", 232 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type], 233 dinfo->bus, dinfo->unit); 234 rs = true; 235 } 236 } 237 238 return rs; 239 } 240 241 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 242 { 243 return drive_get(type, 244 drive_index_to_bus_id(type, index), 245 drive_index_to_unit_id(type, index)); 246 } 247 248 int drive_get_max_bus(BlockInterfaceType type) 249 { 250 int max_bus; 251 BlockBackend *blk; 252 DriveInfo *dinfo; 253 254 max_bus = -1; 255 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 256 dinfo = blk_legacy_dinfo(blk); 257 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 258 max_bus = dinfo->bus; 259 } 260 } 261 return max_bus; 262 } 263 264 /* Get a block device. This should only be used for single-drive devices 265 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 266 appropriate bus. */ 267 DriveInfo *drive_get_next(BlockInterfaceType type) 268 { 269 static int next_block_unit[IF_COUNT]; 270 271 return drive_get(type, 0, next_block_unit[type]++); 272 } 273 274 static void bdrv_format_print(void *opaque, const char *name) 275 { 276 error_printf(" %s", name); 277 } 278 279 typedef struct { 280 QEMUBH *bh; 281 BlockDriverState *bs; 282 } BDRVPutRefBH; 283 284 static void bdrv_put_ref_bh(void *opaque) 285 { 286 BDRVPutRefBH *s = opaque; 287 288 bdrv_unref(s->bs); 289 qemu_bh_delete(s->bh); 290 g_free(s); 291 } 292 293 /* 294 * Release a BDS reference in a BH 295 * 296 * It is not safe to use bdrv_unref() from a callback function when the callers 297 * still need the BlockDriverState. In such cases we schedule a BH to release 298 * the reference. 299 */ 300 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 301 { 302 BDRVPutRefBH *s; 303 304 s = g_new(BDRVPutRefBH, 1); 305 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 306 s->bs = bs; 307 qemu_bh_schedule(s->bh); 308 } 309 310 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 311 { 312 if (!strcmp(buf, "ignore")) { 313 return BLOCKDEV_ON_ERROR_IGNORE; 314 } else if (!is_read && !strcmp(buf, "enospc")) { 315 return BLOCKDEV_ON_ERROR_ENOSPC; 316 } else if (!strcmp(buf, "stop")) { 317 return BLOCKDEV_ON_ERROR_STOP; 318 } else if (!strcmp(buf, "report")) { 319 return BLOCKDEV_ON_ERROR_REPORT; 320 } else { 321 error_setg(errp, "'%s' invalid %s error action", 322 buf, is_read ? "read" : "write"); 323 return -1; 324 } 325 } 326 327 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 328 { 329 if (throttle_conflicting(cfg)) { 330 error_setg(errp, "bps/iops/max total values and read/write values" 331 " cannot be used at the same time"); 332 return false; 333 } 334 335 if (!throttle_is_valid(cfg)) { 336 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 337 return false; 338 } 339 340 return true; 341 } 342 343 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 344 345 /* Takes the ownership of bs_opts */ 346 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 347 Error **errp) 348 { 349 const char *buf; 350 int ro = 0; 351 int bdrv_flags = 0; 352 int on_read_error, on_write_error; 353 BlockBackend *blk; 354 BlockDriverState *bs; 355 ThrottleConfig cfg; 356 int snapshot = 0; 357 bool copy_on_read; 358 Error *error = NULL; 359 QemuOpts *opts; 360 const char *id; 361 bool has_driver_specific_opts; 362 BlockdevDetectZeroesOptions detect_zeroes; 363 const char *throttling_group; 364 365 /* Check common options by copying from bs_opts to opts, all other options 366 * stay in bs_opts for processing by bdrv_open(). */ 367 id = qdict_get_try_str(bs_opts, "id"); 368 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 369 if (error) { 370 error_propagate(errp, error); 371 goto err_no_opts; 372 } 373 374 qemu_opts_absorb_qdict(opts, bs_opts, &error); 375 if (error) { 376 error_propagate(errp, error); 377 goto early_err; 378 } 379 380 if (id) { 381 qdict_del(bs_opts, "id"); 382 } 383 384 has_driver_specific_opts = !!qdict_size(bs_opts); 385 386 /* extract parameters */ 387 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 388 ro = qemu_opt_get_bool(opts, "read-only", 0); 389 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 390 391 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 392 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 393 error_setg(errp, "invalid discard option"); 394 goto early_err; 395 } 396 } 397 398 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) { 399 bdrv_flags |= BDRV_O_CACHE_WB; 400 } 401 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) { 402 bdrv_flags |= BDRV_O_NOCACHE; 403 } 404 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { 405 bdrv_flags |= BDRV_O_NO_FLUSH; 406 } 407 408 #ifdef CONFIG_LINUX_AIO 409 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 410 if (!strcmp(buf, "native")) { 411 bdrv_flags |= BDRV_O_NATIVE_AIO; 412 } else if (!strcmp(buf, "threads")) { 413 /* this is the default */ 414 } else { 415 error_setg(errp, "invalid aio option"); 416 goto early_err; 417 } 418 } 419 #endif 420 421 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 422 if (is_help_option(buf)) { 423 error_printf("Supported formats:"); 424 bdrv_iterate_format(bdrv_format_print, NULL); 425 error_printf("\n"); 426 goto early_err; 427 } 428 429 if (qdict_haskey(bs_opts, "driver")) { 430 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 431 goto early_err; 432 } 433 qdict_put(bs_opts, "driver", qstring_from_str(buf)); 434 } 435 436 /* disk I/O throttling */ 437 memset(&cfg, 0, sizeof(cfg)); 438 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 439 qemu_opt_get_number(opts, "throttling.bps-total", 0); 440 cfg.buckets[THROTTLE_BPS_READ].avg = 441 qemu_opt_get_number(opts, "throttling.bps-read", 0); 442 cfg.buckets[THROTTLE_BPS_WRITE].avg = 443 qemu_opt_get_number(opts, "throttling.bps-write", 0); 444 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 445 qemu_opt_get_number(opts, "throttling.iops-total", 0); 446 cfg.buckets[THROTTLE_OPS_READ].avg = 447 qemu_opt_get_number(opts, "throttling.iops-read", 0); 448 cfg.buckets[THROTTLE_OPS_WRITE].avg = 449 qemu_opt_get_number(opts, "throttling.iops-write", 0); 450 451 cfg.buckets[THROTTLE_BPS_TOTAL].max = 452 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 453 cfg.buckets[THROTTLE_BPS_READ].max = 454 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 455 cfg.buckets[THROTTLE_BPS_WRITE].max = 456 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 457 cfg.buckets[THROTTLE_OPS_TOTAL].max = 458 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 459 cfg.buckets[THROTTLE_OPS_READ].max = 460 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 461 cfg.buckets[THROTTLE_OPS_WRITE].max = 462 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 463 464 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 465 466 throttling_group = qemu_opt_get(opts, "throttling.group"); 467 468 if (!check_throttle_config(&cfg, &error)) { 469 error_propagate(errp, error); 470 goto early_err; 471 } 472 473 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 474 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 475 on_write_error = parse_block_error_action(buf, 0, &error); 476 if (error) { 477 error_propagate(errp, error); 478 goto early_err; 479 } 480 } 481 482 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 483 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 484 on_read_error = parse_block_error_action(buf, 1, &error); 485 if (error) { 486 error_propagate(errp, error); 487 goto early_err; 488 } 489 } 490 491 detect_zeroes = 492 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 493 qemu_opt_get(opts, "detect-zeroes"), 494 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 495 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 496 &error); 497 if (error) { 498 error_propagate(errp, error); 499 goto early_err; 500 } 501 502 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 503 !(bdrv_flags & BDRV_O_UNMAP)) { 504 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 505 "without setting discard operation to unmap"); 506 goto early_err; 507 } 508 509 /* init */ 510 if ((!file || !*file) && !has_driver_specific_opts) { 511 blk = blk_new_with_bs(qemu_opts_id(opts), errp); 512 if (!blk) { 513 goto early_err; 514 } 515 516 bs = blk_bs(blk); 517 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 518 bs->read_only = ro; 519 520 QDECREF(bs_opts); 521 } else { 522 if (file && !*file) { 523 file = NULL; 524 } 525 526 if (snapshot) { 527 /* always use cache=unsafe with snapshot */ 528 bdrv_flags &= ~BDRV_O_CACHE_MASK; 529 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 530 } 531 532 if (copy_on_read) { 533 bdrv_flags |= BDRV_O_COPY_ON_READ; 534 } 535 536 if (runstate_check(RUN_STATE_INMIGRATE)) { 537 bdrv_flags |= BDRV_O_INCOMING; 538 } 539 540 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 541 542 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags, 543 errp); 544 if (!blk) { 545 goto err_no_bs_opts; 546 } 547 bs = blk_bs(blk); 548 } 549 550 bs->detect_zeroes = detect_zeroes; 551 552 bdrv_set_on_error(bs, on_read_error, on_write_error); 553 554 /* disk I/O throttling */ 555 if (throttle_enabled(&cfg)) { 556 if (!throttling_group) { 557 throttling_group = blk_name(blk); 558 } 559 bdrv_io_limits_enable(bs, throttling_group); 560 bdrv_set_io_limits(bs, &cfg); 561 } 562 563 if (bdrv_key_required(bs)) { 564 autostart = 0; 565 } 566 567 err_no_bs_opts: 568 qemu_opts_del(opts); 569 return blk; 570 571 early_err: 572 qemu_opts_del(opts); 573 err_no_opts: 574 QDECREF(bs_opts); 575 return NULL; 576 } 577 578 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 579 Error **errp) 580 { 581 const char *value; 582 583 value = qemu_opt_get(opts, from); 584 if (value) { 585 if (qemu_opt_find(opts, to)) { 586 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 587 "same time", to, from); 588 return; 589 } 590 } 591 592 /* rename all items in opts */ 593 while ((value = qemu_opt_get(opts, from))) { 594 qemu_opt_set(opts, to, value, &error_abort); 595 qemu_opt_unset(opts, from); 596 } 597 } 598 599 QemuOptsList qemu_legacy_drive_opts = { 600 .name = "drive", 601 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 602 .desc = { 603 { 604 .name = "bus", 605 .type = QEMU_OPT_NUMBER, 606 .help = "bus number", 607 },{ 608 .name = "unit", 609 .type = QEMU_OPT_NUMBER, 610 .help = "unit number (i.e. lun for scsi)", 611 },{ 612 .name = "index", 613 .type = QEMU_OPT_NUMBER, 614 .help = "index number", 615 },{ 616 .name = "media", 617 .type = QEMU_OPT_STRING, 618 .help = "media type (disk, cdrom)", 619 },{ 620 .name = "if", 621 .type = QEMU_OPT_STRING, 622 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 623 },{ 624 .name = "cyls", 625 .type = QEMU_OPT_NUMBER, 626 .help = "number of cylinders (ide disk geometry)", 627 },{ 628 .name = "heads", 629 .type = QEMU_OPT_NUMBER, 630 .help = "number of heads (ide disk geometry)", 631 },{ 632 .name = "secs", 633 .type = QEMU_OPT_NUMBER, 634 .help = "number of sectors (ide disk geometry)", 635 },{ 636 .name = "trans", 637 .type = QEMU_OPT_STRING, 638 .help = "chs translation (auto, lba, none)", 639 },{ 640 .name = "boot", 641 .type = QEMU_OPT_BOOL, 642 .help = "(deprecated, ignored)", 643 },{ 644 .name = "addr", 645 .type = QEMU_OPT_STRING, 646 .help = "pci address (virtio only)", 647 },{ 648 .name = "serial", 649 .type = QEMU_OPT_STRING, 650 .help = "disk serial number", 651 },{ 652 .name = "file", 653 .type = QEMU_OPT_STRING, 654 .help = "file name", 655 }, 656 657 /* Options that are passed on, but have special semantics with -drive */ 658 { 659 .name = "read-only", 660 .type = QEMU_OPT_BOOL, 661 .help = "open drive file as read-only", 662 },{ 663 .name = "rerror", 664 .type = QEMU_OPT_STRING, 665 .help = "read error action", 666 },{ 667 .name = "werror", 668 .type = QEMU_OPT_STRING, 669 .help = "write error action", 670 },{ 671 .name = "copy-on-read", 672 .type = QEMU_OPT_BOOL, 673 .help = "copy read data from backing file into image file", 674 }, 675 676 { /* end of list */ } 677 }, 678 }; 679 680 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 681 { 682 const char *value; 683 BlockBackend *blk; 684 DriveInfo *dinfo = NULL; 685 QDict *bs_opts; 686 QemuOpts *legacy_opts; 687 DriveMediaType media = MEDIA_DISK; 688 BlockInterfaceType type; 689 int cyls, heads, secs, translation; 690 int max_devs, bus_id, unit_id, index; 691 const char *devaddr; 692 const char *werror, *rerror; 693 bool read_only = false; 694 bool copy_on_read; 695 const char *serial; 696 const char *filename; 697 Error *local_err = NULL; 698 int i; 699 700 /* Change legacy command line options into QMP ones */ 701 static const struct { 702 const char *from; 703 const char *to; 704 } opt_renames[] = { 705 { "iops", "throttling.iops-total" }, 706 { "iops_rd", "throttling.iops-read" }, 707 { "iops_wr", "throttling.iops-write" }, 708 709 { "bps", "throttling.bps-total" }, 710 { "bps_rd", "throttling.bps-read" }, 711 { "bps_wr", "throttling.bps-write" }, 712 713 { "iops_max", "throttling.iops-total-max" }, 714 { "iops_rd_max", "throttling.iops-read-max" }, 715 { "iops_wr_max", "throttling.iops-write-max" }, 716 717 { "bps_max", "throttling.bps-total-max" }, 718 { "bps_rd_max", "throttling.bps-read-max" }, 719 { "bps_wr_max", "throttling.bps-write-max" }, 720 721 { "iops_size", "throttling.iops-size" }, 722 723 { "group", "throttling.group" }, 724 725 { "readonly", "read-only" }, 726 }; 727 728 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 729 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 730 &local_err); 731 if (local_err) { 732 error_report_err(local_err); 733 return NULL; 734 } 735 } 736 737 value = qemu_opt_get(all_opts, "cache"); 738 if (value) { 739 int flags = 0; 740 741 if (bdrv_parse_cache_flags(value, &flags) != 0) { 742 error_report("invalid cache option"); 743 return NULL; 744 } 745 746 /* Specific options take precedence */ 747 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 748 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 749 !!(flags & BDRV_O_CACHE_WB), &error_abort); 750 } 751 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 752 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 753 !!(flags & BDRV_O_NOCACHE), &error_abort); 754 } 755 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 756 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 757 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 758 } 759 qemu_opt_unset(all_opts, "cache"); 760 } 761 762 /* Get a QDict for processing the options */ 763 bs_opts = qdict_new(); 764 qemu_opts_to_qdict(all_opts, bs_opts); 765 766 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 767 &error_abort); 768 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 769 if (local_err) { 770 error_report_err(local_err); 771 goto fail; 772 } 773 774 /* Deprecated option boot=[on|off] */ 775 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 776 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 777 "ignored. Future versions will reject this parameter. Please " 778 "update your scripts.\n"); 779 } 780 781 /* Media type */ 782 value = qemu_opt_get(legacy_opts, "media"); 783 if (value) { 784 if (!strcmp(value, "disk")) { 785 media = MEDIA_DISK; 786 } else if (!strcmp(value, "cdrom")) { 787 media = MEDIA_CDROM; 788 read_only = true; 789 } else { 790 error_report("'%s' invalid media", value); 791 goto fail; 792 } 793 } 794 795 /* copy-on-read is disabled with a warning for read-only devices */ 796 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 797 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 798 799 if (read_only && copy_on_read) { 800 error_report("warning: disabling copy-on-read on read-only drive"); 801 copy_on_read = false; 802 } 803 804 qdict_put(bs_opts, "read-only", 805 qstring_from_str(read_only ? "on" : "off")); 806 qdict_put(bs_opts, "copy-on-read", 807 qstring_from_str(copy_on_read ? "on" :"off")); 808 809 /* Controller type */ 810 value = qemu_opt_get(legacy_opts, "if"); 811 if (value) { 812 for (type = 0; 813 type < IF_COUNT && strcmp(value, if_name[type]); 814 type++) { 815 } 816 if (type == IF_COUNT) { 817 error_report("unsupported bus type '%s'", value); 818 goto fail; 819 } 820 } else { 821 type = block_default_type; 822 } 823 824 /* Geometry */ 825 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 826 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 827 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 828 829 if (cyls || heads || secs) { 830 if (cyls < 1) { 831 error_report("invalid physical cyls number"); 832 goto fail; 833 } 834 if (heads < 1) { 835 error_report("invalid physical heads number"); 836 goto fail; 837 } 838 if (secs < 1) { 839 error_report("invalid physical secs number"); 840 goto fail; 841 } 842 } 843 844 translation = BIOS_ATA_TRANSLATION_AUTO; 845 value = qemu_opt_get(legacy_opts, "trans"); 846 if (value != NULL) { 847 if (!cyls) { 848 error_report("'%s' trans must be used with cyls, heads and secs", 849 value); 850 goto fail; 851 } 852 if (!strcmp(value, "none")) { 853 translation = BIOS_ATA_TRANSLATION_NONE; 854 } else if (!strcmp(value, "lba")) { 855 translation = BIOS_ATA_TRANSLATION_LBA; 856 } else if (!strcmp(value, "large")) { 857 translation = BIOS_ATA_TRANSLATION_LARGE; 858 } else if (!strcmp(value, "rechs")) { 859 translation = BIOS_ATA_TRANSLATION_RECHS; 860 } else if (!strcmp(value, "auto")) { 861 translation = BIOS_ATA_TRANSLATION_AUTO; 862 } else { 863 error_report("'%s' invalid translation type", value); 864 goto fail; 865 } 866 } 867 868 if (media == MEDIA_CDROM) { 869 if (cyls || secs || heads) { 870 error_report("CHS can't be set with media=cdrom"); 871 goto fail; 872 } 873 } 874 875 /* Device address specified by bus/unit or index. 876 * If none was specified, try to find the first free one. */ 877 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 878 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 879 index = qemu_opt_get_number(legacy_opts, "index", -1); 880 881 max_devs = if_max_devs[type]; 882 883 if (index != -1) { 884 if (bus_id != 0 || unit_id != -1) { 885 error_report("index cannot be used with bus and unit"); 886 goto fail; 887 } 888 bus_id = drive_index_to_bus_id(type, index); 889 unit_id = drive_index_to_unit_id(type, index); 890 } 891 892 if (unit_id == -1) { 893 unit_id = 0; 894 while (drive_get(type, bus_id, unit_id) != NULL) { 895 unit_id++; 896 if (max_devs && unit_id >= max_devs) { 897 unit_id -= max_devs; 898 bus_id++; 899 } 900 } 901 } 902 903 if (max_devs && unit_id >= max_devs) { 904 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 905 goto fail; 906 } 907 908 if (drive_get(type, bus_id, unit_id) != NULL) { 909 error_report("drive with bus=%d, unit=%d (index=%d) exists", 910 bus_id, unit_id, index); 911 goto fail; 912 } 913 914 /* Serial number */ 915 serial = qemu_opt_get(legacy_opts, "serial"); 916 917 /* no id supplied -> create one */ 918 if (qemu_opts_id(all_opts) == NULL) { 919 char *new_id; 920 const char *mediastr = ""; 921 if (type == IF_IDE || type == IF_SCSI) { 922 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 923 } 924 if (max_devs) { 925 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 926 mediastr, unit_id); 927 } else { 928 new_id = g_strdup_printf("%s%s%i", if_name[type], 929 mediastr, unit_id); 930 } 931 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 932 g_free(new_id); 933 } 934 935 /* Add virtio block device */ 936 devaddr = qemu_opt_get(legacy_opts, "addr"); 937 if (devaddr && type != IF_VIRTIO) { 938 error_report("addr is not supported by this bus type"); 939 goto fail; 940 } 941 942 if (type == IF_VIRTIO) { 943 QemuOpts *devopts; 944 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 945 &error_abort); 946 if (arch_type == QEMU_ARCH_S390X) { 947 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 948 } else { 949 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 950 } 951 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 952 &error_abort); 953 if (devaddr) { 954 qemu_opt_set(devopts, "addr", devaddr, &error_abort); 955 } 956 } 957 958 filename = qemu_opt_get(legacy_opts, "file"); 959 960 /* Check werror/rerror compatibility with if=... */ 961 werror = qemu_opt_get(legacy_opts, "werror"); 962 if (werror != NULL) { 963 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 964 type != IF_NONE) { 965 error_report("werror is not supported by this bus type"); 966 goto fail; 967 } 968 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 969 } 970 971 rerror = qemu_opt_get(legacy_opts, "rerror"); 972 if (rerror != NULL) { 973 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 974 type != IF_NONE) { 975 error_report("rerror is not supported by this bus type"); 976 goto fail; 977 } 978 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 979 } 980 981 /* Actual block device init: Functionality shared with blockdev-add */ 982 blk = blockdev_init(filename, bs_opts, &local_err); 983 bs_opts = NULL; 984 if (!blk) { 985 if (local_err) { 986 error_report_err(local_err); 987 } 988 goto fail; 989 } else { 990 assert(!local_err); 991 } 992 993 /* Create legacy DriveInfo */ 994 dinfo = g_malloc0(sizeof(*dinfo)); 995 dinfo->opts = all_opts; 996 997 dinfo->cyls = cyls; 998 dinfo->heads = heads; 999 dinfo->secs = secs; 1000 dinfo->trans = translation; 1001 1002 dinfo->type = type; 1003 dinfo->bus = bus_id; 1004 dinfo->unit = unit_id; 1005 dinfo->devaddr = devaddr; 1006 dinfo->serial = g_strdup(serial); 1007 1008 blk_set_legacy_dinfo(blk, dinfo); 1009 1010 switch(type) { 1011 case IF_IDE: 1012 case IF_SCSI: 1013 case IF_XEN: 1014 case IF_NONE: 1015 dinfo->media_cd = media == MEDIA_CDROM; 1016 break; 1017 default: 1018 break; 1019 } 1020 1021 fail: 1022 qemu_opts_del(legacy_opts); 1023 QDECREF(bs_opts); 1024 return dinfo; 1025 } 1026 1027 void hmp_commit(Monitor *mon, const QDict *qdict) 1028 { 1029 const char *device = qdict_get_str(qdict, "device"); 1030 BlockBackend *blk; 1031 int ret; 1032 1033 if (!strcmp(device, "all")) { 1034 ret = bdrv_commit_all(); 1035 } else { 1036 blk = blk_by_name(device); 1037 if (!blk) { 1038 monitor_printf(mon, "Device '%s' not found\n", device); 1039 return; 1040 } 1041 ret = bdrv_commit(blk_bs(blk)); 1042 } 1043 if (ret < 0) { 1044 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1045 strerror(-ret)); 1046 } 1047 } 1048 1049 static void blockdev_do_action(int kind, void *data, Error **errp) 1050 { 1051 TransactionAction action; 1052 TransactionActionList list; 1053 1054 action.kind = kind; 1055 action.data = data; 1056 list.value = &action; 1057 list.next = NULL; 1058 qmp_transaction(&list, errp); 1059 } 1060 1061 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1062 bool has_node_name, const char *node_name, 1063 const char *snapshot_file, 1064 bool has_snapshot_node_name, 1065 const char *snapshot_node_name, 1066 bool has_format, const char *format, 1067 bool has_mode, NewImageMode mode, Error **errp) 1068 { 1069 BlockdevSnapshot snapshot = { 1070 .has_device = has_device, 1071 .device = (char *) device, 1072 .has_node_name = has_node_name, 1073 .node_name = (char *) node_name, 1074 .snapshot_file = (char *) snapshot_file, 1075 .has_snapshot_node_name = has_snapshot_node_name, 1076 .snapshot_node_name = (char *) snapshot_node_name, 1077 .has_format = has_format, 1078 .format = (char *) format, 1079 .has_mode = has_mode, 1080 .mode = mode, 1081 }; 1082 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1083 &snapshot, errp); 1084 } 1085 1086 void qmp_blockdev_snapshot_internal_sync(const char *device, 1087 const char *name, 1088 Error **errp) 1089 { 1090 BlockdevSnapshotInternal snapshot = { 1091 .device = (char *) device, 1092 .name = (char *) name 1093 }; 1094 1095 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1096 &snapshot, errp); 1097 } 1098 1099 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1100 bool has_id, 1101 const char *id, 1102 bool has_name, 1103 const char *name, 1104 Error **errp) 1105 { 1106 BlockDriverState *bs; 1107 BlockBackend *blk; 1108 AioContext *aio_context; 1109 QEMUSnapshotInfo sn; 1110 Error *local_err = NULL; 1111 SnapshotInfo *info = NULL; 1112 int ret; 1113 1114 blk = blk_by_name(device); 1115 if (!blk) { 1116 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1117 "Device '%s' not found", device); 1118 return NULL; 1119 } 1120 bs = blk_bs(blk); 1121 1122 if (!has_id) { 1123 id = NULL; 1124 } 1125 1126 if (!has_name) { 1127 name = NULL; 1128 } 1129 1130 if (!id && !name) { 1131 error_setg(errp, "Name or id must be provided"); 1132 return NULL; 1133 } 1134 1135 aio_context = bdrv_get_aio_context(bs); 1136 aio_context_acquire(aio_context); 1137 1138 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1139 goto out_aio_context; 1140 } 1141 1142 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1143 if (local_err) { 1144 error_propagate(errp, local_err); 1145 goto out_aio_context; 1146 } 1147 if (!ret) { 1148 error_setg(errp, 1149 "Snapshot with id '%s' and name '%s' does not exist on " 1150 "device '%s'", 1151 STR_OR_NULL(id), STR_OR_NULL(name), device); 1152 goto out_aio_context; 1153 } 1154 1155 bdrv_snapshot_delete(bs, id, name, &local_err); 1156 if (local_err) { 1157 error_propagate(errp, local_err); 1158 goto out_aio_context; 1159 } 1160 1161 aio_context_release(aio_context); 1162 1163 info = g_new0(SnapshotInfo, 1); 1164 info->id = g_strdup(sn.id_str); 1165 info->name = g_strdup(sn.name); 1166 info->date_nsec = sn.date_nsec; 1167 info->date_sec = sn.date_sec; 1168 info->vm_state_size = sn.vm_state_size; 1169 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1170 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1171 1172 return info; 1173 1174 out_aio_context: 1175 aio_context_release(aio_context); 1176 return NULL; 1177 } 1178 1179 /** 1180 * block_dirty_bitmap_lookup: 1181 * Return a dirty bitmap (if present), after validating 1182 * the node reference and bitmap names. 1183 * 1184 * @node: The name of the BDS node to search for bitmaps 1185 * @name: The name of the bitmap to search for 1186 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1187 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL. 1188 * @errp: Output pointer for error information. Can be NULL. 1189 * 1190 * @return: A bitmap object on success, or NULL on failure. 1191 */ 1192 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1193 const char *name, 1194 BlockDriverState **pbs, 1195 AioContext **paio, 1196 Error **errp) 1197 { 1198 BlockDriverState *bs; 1199 BdrvDirtyBitmap *bitmap; 1200 AioContext *aio_context; 1201 1202 if (!node) { 1203 error_setg(errp, "Node cannot be NULL"); 1204 return NULL; 1205 } 1206 if (!name) { 1207 error_setg(errp, "Bitmap name cannot be NULL"); 1208 return NULL; 1209 } 1210 bs = bdrv_lookup_bs(node, node, NULL); 1211 if (!bs) { 1212 error_setg(errp, "Node '%s' not found", node); 1213 return NULL; 1214 } 1215 1216 aio_context = bdrv_get_aio_context(bs); 1217 aio_context_acquire(aio_context); 1218 1219 bitmap = bdrv_find_dirty_bitmap(bs, name); 1220 if (!bitmap) { 1221 error_setg(errp, "Dirty bitmap '%s' not found", name); 1222 goto fail; 1223 } 1224 1225 if (pbs) { 1226 *pbs = bs; 1227 } 1228 if (paio) { 1229 *paio = aio_context; 1230 } else { 1231 aio_context_release(aio_context); 1232 } 1233 1234 return bitmap; 1235 1236 fail: 1237 aio_context_release(aio_context); 1238 return NULL; 1239 } 1240 1241 /* New and old BlockDriverState structs for atomic group operations */ 1242 1243 typedef struct BlkTransactionState BlkTransactionState; 1244 1245 /* Only prepare() may fail. In a single transaction, only one of commit() or 1246 abort() will be called, clean() will always be called if it present. */ 1247 typedef struct BdrvActionOps { 1248 /* Size of state struct, in bytes. */ 1249 size_t instance_size; 1250 /* Prepare the work, must NOT be NULL. */ 1251 void (*prepare)(BlkTransactionState *common, Error **errp); 1252 /* Commit the changes, can be NULL. */ 1253 void (*commit)(BlkTransactionState *common); 1254 /* Abort the changes on fail, can be NULL. */ 1255 void (*abort)(BlkTransactionState *common); 1256 /* Clean up resource in the end, can be NULL. */ 1257 void (*clean)(BlkTransactionState *common); 1258 } BdrvActionOps; 1259 1260 /* 1261 * This structure must be arranged as first member in child type, assuming 1262 * that compiler will also arrange it to the same address with parent instance. 1263 * Later it will be used in free(). 1264 */ 1265 struct BlkTransactionState { 1266 TransactionAction *action; 1267 const BdrvActionOps *ops; 1268 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1269 }; 1270 1271 /* internal snapshot private data */ 1272 typedef struct InternalSnapshotState { 1273 BlkTransactionState common; 1274 BlockDriverState *bs; 1275 AioContext *aio_context; 1276 QEMUSnapshotInfo sn; 1277 } InternalSnapshotState; 1278 1279 static void internal_snapshot_prepare(BlkTransactionState *common, 1280 Error **errp) 1281 { 1282 Error *local_err = NULL; 1283 const char *device; 1284 const char *name; 1285 BlockBackend *blk; 1286 BlockDriverState *bs; 1287 QEMUSnapshotInfo old_sn, *sn; 1288 bool ret; 1289 qemu_timeval tv; 1290 BlockdevSnapshotInternal *internal; 1291 InternalSnapshotState *state; 1292 int ret1; 1293 1294 g_assert(common->action->kind == 1295 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1296 internal = common->action->blockdev_snapshot_internal_sync; 1297 state = DO_UPCAST(InternalSnapshotState, common, common); 1298 1299 /* 1. parse input */ 1300 device = internal->device; 1301 name = internal->name; 1302 1303 /* 2. check for validation */ 1304 blk = blk_by_name(device); 1305 if (!blk) { 1306 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1307 "Device '%s' not found", device); 1308 return; 1309 } 1310 bs = blk_bs(blk); 1311 1312 /* AioContext is released in .clean() */ 1313 state->aio_context = bdrv_get_aio_context(bs); 1314 aio_context_acquire(state->aio_context); 1315 1316 if (!bdrv_is_inserted(bs)) { 1317 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1318 return; 1319 } 1320 1321 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1322 return; 1323 } 1324 1325 if (bdrv_is_read_only(bs)) { 1326 error_setg(errp, "Device '%s' is read only", device); 1327 return; 1328 } 1329 1330 if (!bdrv_can_snapshot(bs)) { 1331 error_setg(errp, "Block format '%s' used by device '%s' " 1332 "does not support internal snapshots", 1333 bs->drv->format_name, device); 1334 return; 1335 } 1336 1337 if (!strlen(name)) { 1338 error_setg(errp, "Name is empty"); 1339 return; 1340 } 1341 1342 /* check whether a snapshot with name exist */ 1343 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1344 &local_err); 1345 if (local_err) { 1346 error_propagate(errp, local_err); 1347 return; 1348 } else if (ret) { 1349 error_setg(errp, 1350 "Snapshot with name '%s' already exists on device '%s'", 1351 name, device); 1352 return; 1353 } 1354 1355 /* 3. take the snapshot */ 1356 sn = &state->sn; 1357 pstrcpy(sn->name, sizeof(sn->name), name); 1358 qemu_gettimeofday(&tv); 1359 sn->date_sec = tv.tv_sec; 1360 sn->date_nsec = tv.tv_usec * 1000; 1361 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1362 1363 ret1 = bdrv_snapshot_create(bs, sn); 1364 if (ret1 < 0) { 1365 error_setg_errno(errp, -ret1, 1366 "Failed to create snapshot '%s' on device '%s'", 1367 name, device); 1368 return; 1369 } 1370 1371 /* 4. succeed, mark a snapshot is created */ 1372 state->bs = bs; 1373 } 1374 1375 static void internal_snapshot_abort(BlkTransactionState *common) 1376 { 1377 InternalSnapshotState *state = 1378 DO_UPCAST(InternalSnapshotState, common, common); 1379 BlockDriverState *bs = state->bs; 1380 QEMUSnapshotInfo *sn = &state->sn; 1381 Error *local_error = NULL; 1382 1383 if (!bs) { 1384 return; 1385 } 1386 1387 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1388 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1389 "device '%s' in abort: %s", 1390 sn->id_str, 1391 sn->name, 1392 bdrv_get_device_name(bs), 1393 error_get_pretty(local_error)); 1394 error_free(local_error); 1395 } 1396 } 1397 1398 static void internal_snapshot_clean(BlkTransactionState *common) 1399 { 1400 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1401 common, common); 1402 1403 if (state->aio_context) { 1404 aio_context_release(state->aio_context); 1405 } 1406 } 1407 1408 /* external snapshot private data */ 1409 typedef struct ExternalSnapshotState { 1410 BlkTransactionState common; 1411 BlockDriverState *old_bs; 1412 BlockDriverState *new_bs; 1413 AioContext *aio_context; 1414 } ExternalSnapshotState; 1415 1416 static void external_snapshot_prepare(BlkTransactionState *common, 1417 Error **errp) 1418 { 1419 BlockDriver *drv; 1420 int flags, ret; 1421 QDict *options = NULL; 1422 Error *local_err = NULL; 1423 bool has_device = false; 1424 const char *device; 1425 bool has_node_name = false; 1426 const char *node_name; 1427 bool has_snapshot_node_name = false; 1428 const char *snapshot_node_name; 1429 const char *new_image_file; 1430 const char *format = "qcow2"; 1431 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1432 ExternalSnapshotState *state = 1433 DO_UPCAST(ExternalSnapshotState, common, common); 1434 TransactionAction *action = common->action; 1435 1436 /* get parameters */ 1437 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1438 1439 has_device = action->blockdev_snapshot_sync->has_device; 1440 device = action->blockdev_snapshot_sync->device; 1441 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1442 node_name = action->blockdev_snapshot_sync->node_name; 1443 has_snapshot_node_name = 1444 action->blockdev_snapshot_sync->has_snapshot_node_name; 1445 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1446 1447 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1448 if (action->blockdev_snapshot_sync->has_format) { 1449 format = action->blockdev_snapshot_sync->format; 1450 } 1451 if (action->blockdev_snapshot_sync->has_mode) { 1452 mode = action->blockdev_snapshot_sync->mode; 1453 } 1454 1455 /* start processing */ 1456 drv = bdrv_find_format(format); 1457 if (!drv) { 1458 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 1459 return; 1460 } 1461 1462 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1463 has_node_name ? node_name : NULL, 1464 &local_err); 1465 if (local_err) { 1466 error_propagate(errp, local_err); 1467 return; 1468 } 1469 1470 if (has_node_name && !has_snapshot_node_name) { 1471 error_setg(errp, "New snapshot node name missing"); 1472 return; 1473 } 1474 1475 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1476 error_setg(errp, "New snapshot node name already existing"); 1477 return; 1478 } 1479 1480 /* Acquire AioContext now so any threads operating on old_bs stop */ 1481 state->aio_context = bdrv_get_aio_context(state->old_bs); 1482 aio_context_acquire(state->aio_context); 1483 1484 if (!bdrv_is_inserted(state->old_bs)) { 1485 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1486 return; 1487 } 1488 1489 if (bdrv_op_is_blocked(state->old_bs, 1490 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1491 return; 1492 } 1493 1494 if (!bdrv_is_read_only(state->old_bs)) { 1495 if (bdrv_flush(state->old_bs)) { 1496 error_setg(errp, QERR_IO_ERROR); 1497 return; 1498 } 1499 } 1500 1501 if (!bdrv_is_first_non_filter(state->old_bs)) { 1502 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1503 return; 1504 } 1505 1506 flags = state->old_bs->open_flags; 1507 1508 /* create new image w/backing file */ 1509 if (mode != NEW_IMAGE_MODE_EXISTING) { 1510 bdrv_img_create(new_image_file, format, 1511 state->old_bs->filename, 1512 state->old_bs->drv->format_name, 1513 NULL, -1, flags, &local_err, false); 1514 if (local_err) { 1515 error_propagate(errp, local_err); 1516 return; 1517 } 1518 } 1519 1520 if (has_snapshot_node_name) { 1521 options = qdict_new(); 1522 qdict_put(options, "node-name", 1523 qstring_from_str(snapshot_node_name)); 1524 } 1525 1526 /* TODO Inherit bs->options or only take explicit options with an 1527 * extended QMP command? */ 1528 assert(state->new_bs == NULL); 1529 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1530 flags | BDRV_O_NO_BACKING, drv, &local_err); 1531 /* We will manually add the backing_hd field to the bs later */ 1532 if (ret != 0) { 1533 error_propagate(errp, local_err); 1534 } 1535 } 1536 1537 static void external_snapshot_commit(BlkTransactionState *common) 1538 { 1539 ExternalSnapshotState *state = 1540 DO_UPCAST(ExternalSnapshotState, common, common); 1541 1542 bdrv_set_aio_context(state->new_bs, state->aio_context); 1543 1544 /* This removes our old bs and adds the new bs */ 1545 bdrv_append(state->new_bs, state->old_bs); 1546 /* We don't need (or want) to use the transactional 1547 * bdrv_reopen_multiple() across all the entries at once, because we 1548 * don't want to abort all of them if one of them fails the reopen */ 1549 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1550 NULL); 1551 1552 aio_context_release(state->aio_context); 1553 } 1554 1555 static void external_snapshot_abort(BlkTransactionState *common) 1556 { 1557 ExternalSnapshotState *state = 1558 DO_UPCAST(ExternalSnapshotState, common, common); 1559 if (state->new_bs) { 1560 bdrv_unref(state->new_bs); 1561 } 1562 if (state->aio_context) { 1563 aio_context_release(state->aio_context); 1564 } 1565 } 1566 1567 typedef struct DriveBackupState { 1568 BlkTransactionState common; 1569 BlockDriverState *bs; 1570 AioContext *aio_context; 1571 BlockJob *job; 1572 } DriveBackupState; 1573 1574 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1575 { 1576 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1577 BlockDriverState *bs; 1578 BlockBackend *blk; 1579 DriveBackup *backup; 1580 Error *local_err = NULL; 1581 1582 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1583 backup = common->action->drive_backup; 1584 1585 blk = blk_by_name(backup->device); 1586 if (!blk) { 1587 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1588 "Device '%s' not found", backup->device); 1589 return; 1590 } 1591 bs = blk_bs(blk); 1592 1593 /* AioContext is released in .clean() */ 1594 state->aio_context = bdrv_get_aio_context(bs); 1595 aio_context_acquire(state->aio_context); 1596 1597 qmp_drive_backup(backup->device, backup->target, 1598 backup->has_format, backup->format, 1599 backup->sync, 1600 backup->has_mode, backup->mode, 1601 backup->has_speed, backup->speed, 1602 backup->has_bitmap, backup->bitmap, 1603 backup->has_on_source_error, backup->on_source_error, 1604 backup->has_on_target_error, backup->on_target_error, 1605 &local_err); 1606 if (local_err) { 1607 error_propagate(errp, local_err); 1608 return; 1609 } 1610 1611 state->bs = bs; 1612 state->job = state->bs->job; 1613 } 1614 1615 static void drive_backup_abort(BlkTransactionState *common) 1616 { 1617 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1618 BlockDriverState *bs = state->bs; 1619 1620 /* Only cancel if it's the job we started */ 1621 if (bs && bs->job && bs->job == state->job) { 1622 block_job_cancel_sync(bs->job); 1623 } 1624 } 1625 1626 static void drive_backup_clean(BlkTransactionState *common) 1627 { 1628 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1629 1630 if (state->aio_context) { 1631 aio_context_release(state->aio_context); 1632 } 1633 } 1634 1635 typedef struct BlockdevBackupState { 1636 BlkTransactionState common; 1637 BlockDriverState *bs; 1638 BlockJob *job; 1639 AioContext *aio_context; 1640 } BlockdevBackupState; 1641 1642 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1643 { 1644 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1645 BlockdevBackup *backup; 1646 BlockDriverState *bs, *target; 1647 BlockBackend *blk; 1648 Error *local_err = NULL; 1649 1650 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1651 backup = common->action->blockdev_backup; 1652 1653 blk = blk_by_name(backup->device); 1654 if (!blk) { 1655 error_setg(errp, "Device '%s' not found", backup->device); 1656 return; 1657 } 1658 bs = blk_bs(blk); 1659 1660 blk = blk_by_name(backup->target); 1661 if (!blk) { 1662 error_setg(errp, "Device '%s' not found", backup->target); 1663 return; 1664 } 1665 target = blk_bs(blk); 1666 1667 /* AioContext is released in .clean() */ 1668 state->aio_context = bdrv_get_aio_context(bs); 1669 if (state->aio_context != bdrv_get_aio_context(target)) { 1670 state->aio_context = NULL; 1671 error_setg(errp, "Backup between two IO threads is not implemented"); 1672 return; 1673 } 1674 aio_context_acquire(state->aio_context); 1675 1676 qmp_blockdev_backup(backup->device, backup->target, 1677 backup->sync, 1678 backup->has_speed, backup->speed, 1679 backup->has_on_source_error, backup->on_source_error, 1680 backup->has_on_target_error, backup->on_target_error, 1681 &local_err); 1682 if (local_err) { 1683 error_propagate(errp, local_err); 1684 return; 1685 } 1686 1687 state->bs = bs; 1688 state->job = state->bs->job; 1689 } 1690 1691 static void blockdev_backup_abort(BlkTransactionState *common) 1692 { 1693 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1694 BlockDriverState *bs = state->bs; 1695 1696 /* Only cancel if it's the job we started */ 1697 if (bs && bs->job && bs->job == state->job) { 1698 block_job_cancel_sync(bs->job); 1699 } 1700 } 1701 1702 static void blockdev_backup_clean(BlkTransactionState *common) 1703 { 1704 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1705 1706 if (state->aio_context) { 1707 aio_context_release(state->aio_context); 1708 } 1709 } 1710 1711 static void abort_prepare(BlkTransactionState *common, Error **errp) 1712 { 1713 error_setg(errp, "Transaction aborted using Abort action"); 1714 } 1715 1716 static void abort_commit(BlkTransactionState *common) 1717 { 1718 g_assert_not_reached(); /* this action never succeeds */ 1719 } 1720 1721 static const BdrvActionOps actions[] = { 1722 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1723 .instance_size = sizeof(ExternalSnapshotState), 1724 .prepare = external_snapshot_prepare, 1725 .commit = external_snapshot_commit, 1726 .abort = external_snapshot_abort, 1727 }, 1728 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1729 .instance_size = sizeof(DriveBackupState), 1730 .prepare = drive_backup_prepare, 1731 .abort = drive_backup_abort, 1732 .clean = drive_backup_clean, 1733 }, 1734 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1735 .instance_size = sizeof(BlockdevBackupState), 1736 .prepare = blockdev_backup_prepare, 1737 .abort = blockdev_backup_abort, 1738 .clean = blockdev_backup_clean, 1739 }, 1740 [TRANSACTION_ACTION_KIND_ABORT] = { 1741 .instance_size = sizeof(BlkTransactionState), 1742 .prepare = abort_prepare, 1743 .commit = abort_commit, 1744 }, 1745 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1746 .instance_size = sizeof(InternalSnapshotState), 1747 .prepare = internal_snapshot_prepare, 1748 .abort = internal_snapshot_abort, 1749 .clean = internal_snapshot_clean, 1750 }, 1751 }; 1752 1753 /* 1754 * 'Atomic' group operations. The operations are performed as a set, and if 1755 * any fail then we roll back all operations in the group. 1756 */ 1757 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1758 { 1759 TransactionActionList *dev_entry = dev_list; 1760 BlkTransactionState *state, *next; 1761 Error *local_err = NULL; 1762 1763 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1764 QSIMPLEQ_INIT(&snap_bdrv_states); 1765 1766 /* drain all i/o before any operations */ 1767 bdrv_drain_all(); 1768 1769 /* We don't do anything in this loop that commits us to the operations */ 1770 while (NULL != dev_entry) { 1771 TransactionAction *dev_info = NULL; 1772 const BdrvActionOps *ops; 1773 1774 dev_info = dev_entry->value; 1775 dev_entry = dev_entry->next; 1776 1777 assert(dev_info->kind < ARRAY_SIZE(actions)); 1778 1779 ops = &actions[dev_info->kind]; 1780 assert(ops->instance_size > 0); 1781 1782 state = g_malloc0(ops->instance_size); 1783 state->ops = ops; 1784 state->action = dev_info; 1785 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1786 1787 state->ops->prepare(state, &local_err); 1788 if (local_err) { 1789 error_propagate(errp, local_err); 1790 goto delete_and_fail; 1791 } 1792 } 1793 1794 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1795 if (state->ops->commit) { 1796 state->ops->commit(state); 1797 } 1798 } 1799 1800 /* success */ 1801 goto exit; 1802 1803 delete_and_fail: 1804 /* failure, and it is all-or-none; roll back all operations */ 1805 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1806 if (state->ops->abort) { 1807 state->ops->abort(state); 1808 } 1809 } 1810 exit: 1811 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1812 if (state->ops->clean) { 1813 state->ops->clean(state); 1814 } 1815 g_free(state); 1816 } 1817 } 1818 1819 1820 static void eject_device(BlockBackend *blk, int force, Error **errp) 1821 { 1822 BlockDriverState *bs = blk_bs(blk); 1823 AioContext *aio_context; 1824 1825 aio_context = bdrv_get_aio_context(bs); 1826 aio_context_acquire(aio_context); 1827 1828 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1829 goto out; 1830 } 1831 if (!blk_dev_has_removable_media(blk)) { 1832 error_setg(errp, "Device '%s' is not removable", 1833 bdrv_get_device_name(bs)); 1834 goto out; 1835 } 1836 1837 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1838 blk_dev_eject_request(blk, force); 1839 if (!force) { 1840 error_setg(errp, "Device '%s' is locked", 1841 bdrv_get_device_name(bs)); 1842 goto out; 1843 } 1844 } 1845 1846 bdrv_close(bs); 1847 1848 out: 1849 aio_context_release(aio_context); 1850 } 1851 1852 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1853 { 1854 BlockBackend *blk; 1855 1856 blk = blk_by_name(device); 1857 if (!blk) { 1858 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1859 "Device '%s' not found", device); 1860 return; 1861 } 1862 1863 eject_device(blk, force, errp); 1864 } 1865 1866 void qmp_block_passwd(bool has_device, const char *device, 1867 bool has_node_name, const char *node_name, 1868 const char *password, Error **errp) 1869 { 1870 Error *local_err = NULL; 1871 BlockDriverState *bs; 1872 AioContext *aio_context; 1873 1874 bs = bdrv_lookup_bs(has_device ? device : NULL, 1875 has_node_name ? node_name : NULL, 1876 &local_err); 1877 if (local_err) { 1878 error_propagate(errp, local_err); 1879 return; 1880 } 1881 1882 aio_context = bdrv_get_aio_context(bs); 1883 aio_context_acquire(aio_context); 1884 1885 bdrv_add_key(bs, password, errp); 1886 1887 aio_context_release(aio_context); 1888 } 1889 1890 /* Assumes AioContext is held */ 1891 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1892 int bdrv_flags, BlockDriver *drv, 1893 const char *password, Error **errp) 1894 { 1895 Error *local_err = NULL; 1896 int ret; 1897 1898 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1899 if (ret < 0) { 1900 error_propagate(errp, local_err); 1901 return; 1902 } 1903 1904 bdrv_add_key(bs, password, errp); 1905 } 1906 1907 void qmp_change_blockdev(const char *device, const char *filename, 1908 const char *format, Error **errp) 1909 { 1910 BlockBackend *blk; 1911 BlockDriverState *bs; 1912 AioContext *aio_context; 1913 BlockDriver *drv = NULL; 1914 int bdrv_flags; 1915 Error *err = NULL; 1916 1917 blk = blk_by_name(device); 1918 if (!blk) { 1919 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1920 "Device '%s' not found", device); 1921 return; 1922 } 1923 bs = blk_bs(blk); 1924 1925 aio_context = bdrv_get_aio_context(bs); 1926 aio_context_acquire(aio_context); 1927 1928 if (format) { 1929 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1930 if (!drv) { 1931 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 1932 goto out; 1933 } 1934 } 1935 1936 eject_device(blk, 0, &err); 1937 if (err) { 1938 error_propagate(errp, err); 1939 goto out; 1940 } 1941 1942 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1943 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1944 1945 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1946 1947 out: 1948 aio_context_release(aio_context); 1949 } 1950 1951 /* throttling disk I/O limits */ 1952 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1953 int64_t bps_wr, 1954 int64_t iops, 1955 int64_t iops_rd, 1956 int64_t iops_wr, 1957 bool has_bps_max, 1958 int64_t bps_max, 1959 bool has_bps_rd_max, 1960 int64_t bps_rd_max, 1961 bool has_bps_wr_max, 1962 int64_t bps_wr_max, 1963 bool has_iops_max, 1964 int64_t iops_max, 1965 bool has_iops_rd_max, 1966 int64_t iops_rd_max, 1967 bool has_iops_wr_max, 1968 int64_t iops_wr_max, 1969 bool has_iops_size, 1970 int64_t iops_size, 1971 bool has_group, 1972 const char *group, Error **errp) 1973 { 1974 ThrottleConfig cfg; 1975 BlockDriverState *bs; 1976 BlockBackend *blk; 1977 AioContext *aio_context; 1978 1979 blk = blk_by_name(device); 1980 if (!blk) { 1981 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1982 "Device '%s' not found", device); 1983 return; 1984 } 1985 bs = blk_bs(blk); 1986 1987 memset(&cfg, 0, sizeof(cfg)); 1988 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1989 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1990 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1991 1992 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1993 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1994 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1995 1996 if (has_bps_max) { 1997 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1998 } 1999 if (has_bps_rd_max) { 2000 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 2001 } 2002 if (has_bps_wr_max) { 2003 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 2004 } 2005 if (has_iops_max) { 2006 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 2007 } 2008 if (has_iops_rd_max) { 2009 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 2010 } 2011 if (has_iops_wr_max) { 2012 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 2013 } 2014 2015 if (has_iops_size) { 2016 cfg.op_size = iops_size; 2017 } 2018 2019 if (!check_throttle_config(&cfg, errp)) { 2020 return; 2021 } 2022 2023 aio_context = bdrv_get_aio_context(bs); 2024 aio_context_acquire(aio_context); 2025 2026 if (throttle_enabled(&cfg)) { 2027 /* Enable I/O limits if they're not enabled yet, otherwise 2028 * just update the throttling group. */ 2029 if (!bs->io_limits_enabled) { 2030 bdrv_io_limits_enable(bs, has_group ? group : device); 2031 } else if (has_group) { 2032 bdrv_io_limits_update_group(bs, group); 2033 } 2034 /* Set the new throttling configuration */ 2035 bdrv_set_io_limits(bs, &cfg); 2036 } else if (bs->io_limits_enabled) { 2037 /* If all throttling settings are set to 0, disable I/O limits */ 2038 bdrv_io_limits_disable(bs); 2039 } 2040 2041 aio_context_release(aio_context); 2042 } 2043 2044 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2045 bool has_granularity, uint32_t granularity, 2046 Error **errp) 2047 { 2048 AioContext *aio_context; 2049 BlockDriverState *bs; 2050 2051 if (!name || name[0] == '\0') { 2052 error_setg(errp, "Bitmap name cannot be empty"); 2053 return; 2054 } 2055 2056 bs = bdrv_lookup_bs(node, node, errp); 2057 if (!bs) { 2058 return; 2059 } 2060 2061 aio_context = bdrv_get_aio_context(bs); 2062 aio_context_acquire(aio_context); 2063 2064 if (has_granularity) { 2065 if (granularity < 512 || !is_power_of_2(granularity)) { 2066 error_setg(errp, "Granularity must be power of 2 " 2067 "and at least 512"); 2068 goto out; 2069 } 2070 } else { 2071 /* Default to cluster size, if available: */ 2072 granularity = bdrv_get_default_bitmap_granularity(bs); 2073 } 2074 2075 bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2076 2077 out: 2078 aio_context_release(aio_context); 2079 } 2080 2081 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2082 Error **errp) 2083 { 2084 AioContext *aio_context; 2085 BlockDriverState *bs; 2086 BdrvDirtyBitmap *bitmap; 2087 2088 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2089 if (!bitmap || !bs) { 2090 return; 2091 } 2092 2093 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2094 error_setg(errp, 2095 "Bitmap '%s' is currently frozen and cannot be removed", 2096 name); 2097 goto out; 2098 } 2099 bdrv_dirty_bitmap_make_anon(bitmap); 2100 bdrv_release_dirty_bitmap(bs, bitmap); 2101 2102 out: 2103 aio_context_release(aio_context); 2104 } 2105 2106 /** 2107 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2108 * immediately after a full backup operation. 2109 */ 2110 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2111 Error **errp) 2112 { 2113 AioContext *aio_context; 2114 BdrvDirtyBitmap *bitmap; 2115 BlockDriverState *bs; 2116 2117 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2118 if (!bitmap || !bs) { 2119 return; 2120 } 2121 2122 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2123 error_setg(errp, 2124 "Bitmap '%s' is currently frozen and cannot be modified", 2125 name); 2126 goto out; 2127 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 2128 error_setg(errp, 2129 "Bitmap '%s' is currently disabled and cannot be cleared", 2130 name); 2131 goto out; 2132 } 2133 2134 bdrv_clear_dirty_bitmap(bitmap); 2135 2136 out: 2137 aio_context_release(aio_context); 2138 } 2139 2140 void hmp_drive_del(Monitor *mon, const QDict *qdict) 2141 { 2142 const char *id = qdict_get_str(qdict, "id"); 2143 BlockBackend *blk; 2144 BlockDriverState *bs; 2145 AioContext *aio_context; 2146 Error *local_err = NULL; 2147 2148 blk = blk_by_name(id); 2149 if (!blk) { 2150 error_report("Device '%s' not found", id); 2151 return; 2152 } 2153 bs = blk_bs(blk); 2154 2155 if (!blk_legacy_dinfo(blk)) { 2156 error_report("Deleting device added with blockdev-add" 2157 " is not supported"); 2158 return; 2159 } 2160 2161 aio_context = bdrv_get_aio_context(bs); 2162 aio_context_acquire(aio_context); 2163 2164 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2165 error_report_err(local_err); 2166 aio_context_release(aio_context); 2167 return; 2168 } 2169 2170 bdrv_close(bs); 2171 2172 /* if we have a device attached to this BlockDriverState 2173 * then we need to make the drive anonymous until the device 2174 * can be removed. If this is a drive with no device backing 2175 * then we can just get rid of the block driver state right here. 2176 */ 2177 if (blk_get_attached_dev(blk)) { 2178 blk_hide_on_behalf_of_hmp_drive_del(blk); 2179 /* Further I/O must not pause the guest */ 2180 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 2181 BLOCKDEV_ON_ERROR_REPORT); 2182 } else { 2183 blk_unref(blk); 2184 } 2185 2186 aio_context_release(aio_context); 2187 } 2188 2189 void qmp_block_resize(bool has_device, const char *device, 2190 bool has_node_name, const char *node_name, 2191 int64_t size, Error **errp) 2192 { 2193 Error *local_err = NULL; 2194 BlockDriverState *bs; 2195 AioContext *aio_context; 2196 int ret; 2197 2198 bs = bdrv_lookup_bs(has_device ? device : NULL, 2199 has_node_name ? node_name : NULL, 2200 &local_err); 2201 if (local_err) { 2202 error_propagate(errp, local_err); 2203 return; 2204 } 2205 2206 aio_context = bdrv_get_aio_context(bs); 2207 aio_context_acquire(aio_context); 2208 2209 if (!bdrv_is_first_non_filter(bs)) { 2210 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 2211 goto out; 2212 } 2213 2214 if (size < 0) { 2215 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2216 goto out; 2217 } 2218 2219 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2220 error_setg(errp, QERR_DEVICE_IN_USE, device); 2221 goto out; 2222 } 2223 2224 /* complete all in-flight operations before resizing the device */ 2225 bdrv_drain_all(); 2226 2227 ret = bdrv_truncate(bs, size); 2228 switch (ret) { 2229 case 0: 2230 break; 2231 case -ENOMEDIUM: 2232 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2233 break; 2234 case -ENOTSUP: 2235 error_setg(errp, QERR_UNSUPPORTED); 2236 break; 2237 case -EACCES: 2238 error_setg(errp, "Device '%s' is read only", device); 2239 break; 2240 case -EBUSY: 2241 error_setg(errp, QERR_DEVICE_IN_USE, device); 2242 break; 2243 default: 2244 error_setg_errno(errp, -ret, "Could not resize"); 2245 break; 2246 } 2247 2248 out: 2249 aio_context_release(aio_context); 2250 } 2251 2252 static void block_job_cb(void *opaque, int ret) 2253 { 2254 /* Note that this function may be executed from another AioContext besides 2255 * the QEMU main loop. If you need to access anything that assumes the 2256 * QEMU global mutex, use a BH or introduce a mutex. 2257 */ 2258 2259 BlockDriverState *bs = opaque; 2260 const char *msg = NULL; 2261 2262 trace_block_job_cb(bs, bs->job, ret); 2263 2264 assert(bs->job); 2265 2266 if (ret < 0) { 2267 msg = strerror(-ret); 2268 } 2269 2270 if (block_job_is_cancelled(bs->job)) { 2271 block_job_event_cancelled(bs->job); 2272 } else { 2273 block_job_event_completed(bs->job, msg); 2274 } 2275 2276 bdrv_put_ref_bh_schedule(bs); 2277 } 2278 2279 void qmp_block_stream(const char *device, 2280 bool has_base, const char *base, 2281 bool has_backing_file, const char *backing_file, 2282 bool has_speed, int64_t speed, 2283 bool has_on_error, BlockdevOnError on_error, 2284 Error **errp) 2285 { 2286 BlockBackend *blk; 2287 BlockDriverState *bs; 2288 BlockDriverState *base_bs = NULL; 2289 AioContext *aio_context; 2290 Error *local_err = NULL; 2291 const char *base_name = NULL; 2292 2293 if (!has_on_error) { 2294 on_error = BLOCKDEV_ON_ERROR_REPORT; 2295 } 2296 2297 blk = blk_by_name(device); 2298 if (!blk) { 2299 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2300 "Device '%s' not found", device); 2301 return; 2302 } 2303 bs = blk_bs(blk); 2304 2305 aio_context = bdrv_get_aio_context(bs); 2306 aio_context_acquire(aio_context); 2307 2308 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2309 goto out; 2310 } 2311 2312 if (has_base) { 2313 base_bs = bdrv_find_backing_image(bs, base); 2314 if (base_bs == NULL) { 2315 error_setg(errp, QERR_BASE_NOT_FOUND, base); 2316 goto out; 2317 } 2318 assert(bdrv_get_aio_context(base_bs) == aio_context); 2319 base_name = base; 2320 } 2321 2322 /* if we are streaming the entire chain, the result will have no backing 2323 * file, and specifying one is therefore an error */ 2324 if (base_bs == NULL && has_backing_file) { 2325 error_setg(errp, "backing file specified, but streaming the " 2326 "entire chain"); 2327 goto out; 2328 } 2329 2330 /* backing_file string overrides base bs filename */ 2331 base_name = has_backing_file ? backing_file : base_name; 2332 2333 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2334 on_error, block_job_cb, bs, &local_err); 2335 if (local_err) { 2336 error_propagate(errp, local_err); 2337 goto out; 2338 } 2339 2340 trace_qmp_block_stream(bs, bs->job); 2341 2342 out: 2343 aio_context_release(aio_context); 2344 } 2345 2346 void qmp_block_commit(const char *device, 2347 bool has_base, const char *base, 2348 bool has_top, const char *top, 2349 bool has_backing_file, const char *backing_file, 2350 bool has_speed, int64_t speed, 2351 Error **errp) 2352 { 2353 BlockBackend *blk; 2354 BlockDriverState *bs; 2355 BlockDriverState *base_bs, *top_bs; 2356 AioContext *aio_context; 2357 Error *local_err = NULL; 2358 /* This will be part of the QMP command, if/when the 2359 * BlockdevOnError change for blkmirror makes it in 2360 */ 2361 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2362 2363 if (!has_speed) { 2364 speed = 0; 2365 } 2366 2367 /* Important Note: 2368 * libvirt relies on the DeviceNotFound error class in order to probe for 2369 * live commit feature versions; for this to work, we must make sure to 2370 * perform the device lookup before any generic errors that may occur in a 2371 * scenario in which all optional arguments are omitted. */ 2372 blk = blk_by_name(device); 2373 if (!blk) { 2374 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2375 "Device '%s' not found", device); 2376 return; 2377 } 2378 bs = blk_bs(blk); 2379 2380 aio_context = bdrv_get_aio_context(bs); 2381 aio_context_acquire(aio_context); 2382 2383 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2384 goto out; 2385 } 2386 2387 /* default top_bs is the active layer */ 2388 top_bs = bs; 2389 2390 if (has_top && top) { 2391 if (strcmp(bs->filename, top) != 0) { 2392 top_bs = bdrv_find_backing_image(bs, top); 2393 } 2394 } 2395 2396 if (top_bs == NULL) { 2397 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2398 goto out; 2399 } 2400 2401 assert(bdrv_get_aio_context(top_bs) == aio_context); 2402 2403 if (has_base && base) { 2404 base_bs = bdrv_find_backing_image(top_bs, base); 2405 } else { 2406 base_bs = bdrv_find_base(top_bs); 2407 } 2408 2409 if (base_bs == NULL) { 2410 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2411 goto out; 2412 } 2413 2414 assert(bdrv_get_aio_context(base_bs) == aio_context); 2415 2416 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2417 goto out; 2418 } 2419 2420 /* Do not allow attempts to commit an image into itself */ 2421 if (top_bs == base_bs) { 2422 error_setg(errp, "cannot commit an image into itself"); 2423 goto out; 2424 } 2425 2426 if (top_bs == bs) { 2427 if (has_backing_file) { 2428 error_setg(errp, "'backing-file' specified," 2429 " but 'top' is the active layer"); 2430 goto out; 2431 } 2432 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2433 bs, &local_err); 2434 } else { 2435 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2436 has_backing_file ? backing_file : NULL, &local_err); 2437 } 2438 if (local_err != NULL) { 2439 error_propagate(errp, local_err); 2440 goto out; 2441 } 2442 2443 out: 2444 aio_context_release(aio_context); 2445 } 2446 2447 void qmp_drive_backup(const char *device, const char *target, 2448 bool has_format, const char *format, 2449 enum MirrorSyncMode sync, 2450 bool has_mode, enum NewImageMode mode, 2451 bool has_speed, int64_t speed, 2452 bool has_bitmap, const char *bitmap, 2453 bool has_on_source_error, BlockdevOnError on_source_error, 2454 bool has_on_target_error, BlockdevOnError on_target_error, 2455 Error **errp) 2456 { 2457 BlockBackend *blk; 2458 BlockDriverState *bs; 2459 BlockDriverState *target_bs; 2460 BlockDriverState *source = NULL; 2461 BdrvDirtyBitmap *bmap = NULL; 2462 AioContext *aio_context; 2463 BlockDriver *drv = NULL; 2464 Error *local_err = NULL; 2465 int flags; 2466 int64_t size; 2467 int ret; 2468 2469 if (!has_speed) { 2470 speed = 0; 2471 } 2472 if (!has_on_source_error) { 2473 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2474 } 2475 if (!has_on_target_error) { 2476 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2477 } 2478 if (!has_mode) { 2479 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2480 } 2481 2482 blk = blk_by_name(device); 2483 if (!blk) { 2484 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2485 "Device '%s' not found", device); 2486 return; 2487 } 2488 bs = blk_bs(blk); 2489 2490 aio_context = bdrv_get_aio_context(bs); 2491 aio_context_acquire(aio_context); 2492 2493 /* Although backup_run has this check too, we need to use bs->drv below, so 2494 * do an early check redundantly. */ 2495 if (!bdrv_is_inserted(bs)) { 2496 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2497 goto out; 2498 } 2499 2500 if (!has_format) { 2501 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2502 } 2503 if (format) { 2504 drv = bdrv_find_format(format); 2505 if (!drv) { 2506 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 2507 goto out; 2508 } 2509 } 2510 2511 /* Early check to avoid creating target */ 2512 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2513 goto out; 2514 } 2515 2516 flags = bs->open_flags | BDRV_O_RDWR; 2517 2518 /* See if we have a backing HD we can use to create our new image 2519 * on top of. */ 2520 if (sync == MIRROR_SYNC_MODE_TOP) { 2521 source = bs->backing_hd; 2522 if (!source) { 2523 sync = MIRROR_SYNC_MODE_FULL; 2524 } 2525 } 2526 if (sync == MIRROR_SYNC_MODE_NONE) { 2527 source = bs; 2528 } 2529 2530 size = bdrv_getlength(bs); 2531 if (size < 0) { 2532 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2533 goto out; 2534 } 2535 2536 if (mode != NEW_IMAGE_MODE_EXISTING) { 2537 assert(format && drv); 2538 if (source) { 2539 bdrv_img_create(target, format, source->filename, 2540 source->drv->format_name, NULL, 2541 size, flags, &local_err, false); 2542 } else { 2543 bdrv_img_create(target, format, NULL, NULL, NULL, 2544 size, flags, &local_err, false); 2545 } 2546 } 2547 2548 if (local_err) { 2549 error_propagate(errp, local_err); 2550 goto out; 2551 } 2552 2553 target_bs = NULL; 2554 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2555 if (ret < 0) { 2556 error_propagate(errp, local_err); 2557 goto out; 2558 } 2559 2560 bdrv_set_aio_context(target_bs, aio_context); 2561 2562 if (has_bitmap) { 2563 bmap = bdrv_find_dirty_bitmap(bs, bitmap); 2564 if (!bmap) { 2565 error_setg(errp, "Bitmap '%s' could not be found", bitmap); 2566 goto out; 2567 } 2568 } 2569 2570 backup_start(bs, target_bs, speed, sync, bmap, 2571 on_source_error, on_target_error, 2572 block_job_cb, bs, &local_err); 2573 if (local_err != NULL) { 2574 bdrv_unref(target_bs); 2575 error_propagate(errp, local_err); 2576 goto out; 2577 } 2578 2579 out: 2580 aio_context_release(aio_context); 2581 } 2582 2583 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2584 { 2585 return bdrv_named_nodes_list(errp); 2586 } 2587 2588 void qmp_blockdev_backup(const char *device, const char *target, 2589 enum MirrorSyncMode sync, 2590 bool has_speed, int64_t speed, 2591 bool has_on_source_error, 2592 BlockdevOnError on_source_error, 2593 bool has_on_target_error, 2594 BlockdevOnError on_target_error, 2595 Error **errp) 2596 { 2597 BlockBackend *blk; 2598 BlockDriverState *bs; 2599 BlockDriverState *target_bs; 2600 Error *local_err = NULL; 2601 AioContext *aio_context; 2602 2603 if (!has_speed) { 2604 speed = 0; 2605 } 2606 if (!has_on_source_error) { 2607 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2608 } 2609 if (!has_on_target_error) { 2610 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2611 } 2612 2613 blk = blk_by_name(device); 2614 if (!blk) { 2615 error_setg(errp, "Device '%s' not found", device); 2616 return; 2617 } 2618 bs = blk_bs(blk); 2619 2620 aio_context = bdrv_get_aio_context(bs); 2621 aio_context_acquire(aio_context); 2622 2623 blk = blk_by_name(target); 2624 if (!blk) { 2625 error_setg(errp, "Device '%s' not found", target); 2626 goto out; 2627 } 2628 target_bs = blk_bs(blk); 2629 2630 bdrv_ref(target_bs); 2631 bdrv_set_aio_context(target_bs, aio_context); 2632 backup_start(bs, target_bs, speed, sync, NULL, on_source_error, 2633 on_target_error, block_job_cb, bs, &local_err); 2634 if (local_err != NULL) { 2635 bdrv_unref(target_bs); 2636 error_propagate(errp, local_err); 2637 } 2638 out: 2639 aio_context_release(aio_context); 2640 } 2641 2642 void qmp_drive_mirror(const char *device, const char *target, 2643 bool has_format, const char *format, 2644 bool has_node_name, const char *node_name, 2645 bool has_replaces, const char *replaces, 2646 enum MirrorSyncMode sync, 2647 bool has_mode, enum NewImageMode mode, 2648 bool has_speed, int64_t speed, 2649 bool has_granularity, uint32_t granularity, 2650 bool has_buf_size, int64_t buf_size, 2651 bool has_on_source_error, BlockdevOnError on_source_error, 2652 bool has_on_target_error, BlockdevOnError on_target_error, 2653 bool has_unmap, bool unmap, 2654 Error **errp) 2655 { 2656 BlockBackend *blk; 2657 BlockDriverState *bs; 2658 BlockDriverState *source, *target_bs; 2659 AioContext *aio_context; 2660 BlockDriver *drv = NULL; 2661 Error *local_err = NULL; 2662 QDict *options = NULL; 2663 int flags; 2664 int64_t size; 2665 int ret; 2666 2667 if (!has_speed) { 2668 speed = 0; 2669 } 2670 if (!has_on_source_error) { 2671 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2672 } 2673 if (!has_on_target_error) { 2674 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2675 } 2676 if (!has_mode) { 2677 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2678 } 2679 if (!has_granularity) { 2680 granularity = 0; 2681 } 2682 if (!has_buf_size) { 2683 buf_size = 0; 2684 } 2685 if (!has_unmap) { 2686 unmap = true; 2687 } 2688 2689 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2690 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2691 "a value in range [512B, 64MB]"); 2692 return; 2693 } 2694 if (granularity & (granularity - 1)) { 2695 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2696 "power of 2"); 2697 return; 2698 } 2699 2700 blk = blk_by_name(device); 2701 if (!blk) { 2702 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2703 "Device '%s' not found", device); 2704 return; 2705 } 2706 bs = blk_bs(blk); 2707 2708 aio_context = bdrv_get_aio_context(bs); 2709 aio_context_acquire(aio_context); 2710 2711 if (!bdrv_is_inserted(bs)) { 2712 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2713 goto out; 2714 } 2715 2716 if (!has_format) { 2717 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2718 } 2719 if (format) { 2720 drv = bdrv_find_format(format); 2721 if (!drv) { 2722 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 2723 goto out; 2724 } 2725 } 2726 2727 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2728 goto out; 2729 } 2730 2731 flags = bs->open_flags | BDRV_O_RDWR; 2732 source = bs->backing_hd; 2733 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2734 sync = MIRROR_SYNC_MODE_FULL; 2735 } 2736 if (sync == MIRROR_SYNC_MODE_NONE) { 2737 source = bs; 2738 } 2739 2740 size = bdrv_getlength(bs); 2741 if (size < 0) { 2742 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2743 goto out; 2744 } 2745 2746 if (has_replaces) { 2747 BlockDriverState *to_replace_bs; 2748 AioContext *replace_aio_context; 2749 int64_t replace_size; 2750 2751 if (!has_node_name) { 2752 error_setg(errp, "a node-name must be provided when replacing a" 2753 " named node of the graph"); 2754 goto out; 2755 } 2756 2757 to_replace_bs = check_to_replace_node(replaces, &local_err); 2758 2759 if (!to_replace_bs) { 2760 error_propagate(errp, local_err); 2761 goto out; 2762 } 2763 2764 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2765 aio_context_acquire(replace_aio_context); 2766 replace_size = bdrv_getlength(to_replace_bs); 2767 aio_context_release(replace_aio_context); 2768 2769 if (size != replace_size) { 2770 error_setg(errp, "cannot replace image with a mirror image of " 2771 "different size"); 2772 goto out; 2773 } 2774 } 2775 2776 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2777 && mode != NEW_IMAGE_MODE_EXISTING) 2778 { 2779 /* create new image w/o backing file */ 2780 assert(format && drv); 2781 bdrv_img_create(target, format, 2782 NULL, NULL, NULL, size, flags, &local_err, false); 2783 } else { 2784 switch (mode) { 2785 case NEW_IMAGE_MODE_EXISTING: 2786 break; 2787 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2788 /* create new image with backing file */ 2789 bdrv_img_create(target, format, 2790 source->filename, 2791 source->drv->format_name, 2792 NULL, size, flags, &local_err, false); 2793 break; 2794 default: 2795 abort(); 2796 } 2797 } 2798 2799 if (local_err) { 2800 error_propagate(errp, local_err); 2801 goto out; 2802 } 2803 2804 if (has_node_name) { 2805 options = qdict_new(); 2806 qdict_put(options, "node-name", qstring_from_str(node_name)); 2807 } 2808 2809 /* Mirroring takes care of copy-on-write using the source's backing 2810 * file. 2811 */ 2812 target_bs = NULL; 2813 ret = bdrv_open(&target_bs, target, NULL, options, 2814 flags | BDRV_O_NO_BACKING, drv, &local_err); 2815 if (ret < 0) { 2816 error_propagate(errp, local_err); 2817 goto out; 2818 } 2819 2820 bdrv_set_aio_context(target_bs, aio_context); 2821 2822 /* pass the node name to replace to mirror start since it's loose coupling 2823 * and will allow to check whether the node still exist at mirror completion 2824 */ 2825 mirror_start(bs, target_bs, 2826 has_replaces ? replaces : NULL, 2827 speed, granularity, buf_size, sync, 2828 on_source_error, on_target_error, 2829 unmap, 2830 block_job_cb, bs, &local_err); 2831 if (local_err != NULL) { 2832 bdrv_unref(target_bs); 2833 error_propagate(errp, local_err); 2834 goto out; 2835 } 2836 2837 out: 2838 aio_context_release(aio_context); 2839 } 2840 2841 /* Get the block job for a given device name and acquire its AioContext */ 2842 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 2843 Error **errp) 2844 { 2845 BlockBackend *blk; 2846 BlockDriverState *bs; 2847 2848 blk = blk_by_name(device); 2849 if (!blk) { 2850 goto notfound; 2851 } 2852 bs = blk_bs(blk); 2853 2854 *aio_context = bdrv_get_aio_context(bs); 2855 aio_context_acquire(*aio_context); 2856 2857 if (!bs->job) { 2858 aio_context_release(*aio_context); 2859 goto notfound; 2860 } 2861 2862 return bs->job; 2863 2864 notfound: 2865 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 2866 "No active block job on device '%s'", device); 2867 *aio_context = NULL; 2868 return NULL; 2869 } 2870 2871 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2872 { 2873 AioContext *aio_context; 2874 BlockJob *job = find_block_job(device, &aio_context, errp); 2875 2876 if (!job) { 2877 return; 2878 } 2879 2880 block_job_set_speed(job, speed, errp); 2881 aio_context_release(aio_context); 2882 } 2883 2884 void qmp_block_job_cancel(const char *device, 2885 bool has_force, bool force, Error **errp) 2886 { 2887 AioContext *aio_context; 2888 BlockJob *job = find_block_job(device, &aio_context, errp); 2889 2890 if (!job) { 2891 return; 2892 } 2893 2894 if (!has_force) { 2895 force = false; 2896 } 2897 2898 if (job->user_paused && !force) { 2899 error_setg(errp, "The block job for device '%s' is currently paused", 2900 device); 2901 goto out; 2902 } 2903 2904 trace_qmp_block_job_cancel(job); 2905 block_job_cancel(job); 2906 out: 2907 aio_context_release(aio_context); 2908 } 2909 2910 void qmp_block_job_pause(const char *device, Error **errp) 2911 { 2912 AioContext *aio_context; 2913 BlockJob *job = find_block_job(device, &aio_context, errp); 2914 2915 if (!job || job->user_paused) { 2916 return; 2917 } 2918 2919 job->user_paused = true; 2920 trace_qmp_block_job_pause(job); 2921 block_job_pause(job); 2922 aio_context_release(aio_context); 2923 } 2924 2925 void qmp_block_job_resume(const char *device, Error **errp) 2926 { 2927 AioContext *aio_context; 2928 BlockJob *job = find_block_job(device, &aio_context, errp); 2929 2930 if (!job || !job->user_paused) { 2931 return; 2932 } 2933 2934 job->user_paused = false; 2935 trace_qmp_block_job_resume(job); 2936 block_job_resume(job); 2937 aio_context_release(aio_context); 2938 } 2939 2940 void qmp_block_job_complete(const char *device, Error **errp) 2941 { 2942 AioContext *aio_context; 2943 BlockJob *job = find_block_job(device, &aio_context, errp); 2944 2945 if (!job) { 2946 return; 2947 } 2948 2949 trace_qmp_block_job_complete(job); 2950 block_job_complete(job, errp); 2951 aio_context_release(aio_context); 2952 } 2953 2954 void qmp_change_backing_file(const char *device, 2955 const char *image_node_name, 2956 const char *backing_file, 2957 Error **errp) 2958 { 2959 BlockBackend *blk; 2960 BlockDriverState *bs = NULL; 2961 AioContext *aio_context; 2962 BlockDriverState *image_bs = NULL; 2963 Error *local_err = NULL; 2964 bool ro; 2965 int open_flags; 2966 int ret; 2967 2968 blk = blk_by_name(device); 2969 if (!blk) { 2970 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2971 "Device '%s' not found", device); 2972 return; 2973 } 2974 bs = blk_bs(blk); 2975 2976 aio_context = bdrv_get_aio_context(bs); 2977 aio_context_acquire(aio_context); 2978 2979 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2980 if (local_err) { 2981 error_propagate(errp, local_err); 2982 goto out; 2983 } 2984 2985 if (!image_bs) { 2986 error_setg(errp, "image file not found"); 2987 goto out; 2988 } 2989 2990 if (bdrv_find_base(image_bs) == image_bs) { 2991 error_setg(errp, "not allowing backing file change on an image " 2992 "without a backing file"); 2993 goto out; 2994 } 2995 2996 /* even though we are not necessarily operating on bs, we need it to 2997 * determine if block ops are currently prohibited on the chain */ 2998 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 2999 goto out; 3000 } 3001 3002 /* final sanity check */ 3003 if (!bdrv_chain_contains(bs, image_bs)) { 3004 error_setg(errp, "'%s' and image file are not in the same chain", 3005 device); 3006 goto out; 3007 } 3008 3009 /* if not r/w, reopen to make r/w */ 3010 open_flags = image_bs->open_flags; 3011 ro = bdrv_is_read_only(image_bs); 3012 3013 if (ro) { 3014 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 3015 if (local_err) { 3016 error_propagate(errp, local_err); 3017 goto out; 3018 } 3019 } 3020 3021 ret = bdrv_change_backing_file(image_bs, backing_file, 3022 image_bs->drv ? image_bs->drv->format_name : ""); 3023 3024 if (ret < 0) { 3025 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3026 backing_file); 3027 /* don't exit here, so we can try to restore open flags if 3028 * appropriate */ 3029 } 3030 3031 if (ro) { 3032 bdrv_reopen(image_bs, open_flags, &local_err); 3033 if (local_err) { 3034 error_propagate(errp, local_err); /* will preserve prior errp */ 3035 } 3036 } 3037 3038 out: 3039 aio_context_release(aio_context); 3040 } 3041 3042 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3043 { 3044 QmpOutputVisitor *ov = qmp_output_visitor_new(); 3045 BlockBackend *blk; 3046 QObject *obj; 3047 QDict *qdict; 3048 Error *local_err = NULL; 3049 3050 /* Require an ID in the top level */ 3051 if (!options->has_id) { 3052 error_setg(errp, "Block device needs an ID"); 3053 goto fail; 3054 } 3055 3056 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 3057 * cache.direct=false instead of silently switching to aio=threads, except 3058 * when called from drive_new(). 3059 * 3060 * For now, simply forbidding the combination for all drivers will do. */ 3061 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 3062 bool direct = options->has_cache && 3063 options->cache->has_direct && 3064 options->cache->direct; 3065 if (!direct) { 3066 error_setg(errp, "aio=native requires cache.direct=true"); 3067 goto fail; 3068 } 3069 } 3070 3071 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 3072 &options, NULL, &local_err); 3073 if (local_err) { 3074 error_propagate(errp, local_err); 3075 goto fail; 3076 } 3077 3078 obj = qmp_output_get_qobject(ov); 3079 qdict = qobject_to_qdict(obj); 3080 3081 qdict_flatten(qdict); 3082 3083 blk = blockdev_init(NULL, qdict, &local_err); 3084 if (local_err) { 3085 error_propagate(errp, local_err); 3086 goto fail; 3087 } 3088 3089 if (bdrv_key_required(blk_bs(blk))) { 3090 blk_unref(blk); 3091 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 3092 goto fail; 3093 } 3094 3095 fail: 3096 qmp_output_visitor_cleanup(ov); 3097 } 3098 3099 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3100 { 3101 BlockJobInfoList *head = NULL, **p_next = &head; 3102 BlockDriverState *bs; 3103 3104 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 3105 AioContext *aio_context = bdrv_get_aio_context(bs); 3106 3107 aio_context_acquire(aio_context); 3108 3109 if (bs->job) { 3110 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 3111 elem->value = block_job_query(bs->job); 3112 *p_next = elem; 3113 p_next = &elem->next; 3114 } 3115 3116 aio_context_release(aio_context); 3117 } 3118 3119 return head; 3120 } 3121 3122 QemuOptsList qemu_common_drive_opts = { 3123 .name = "drive", 3124 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3125 .desc = { 3126 { 3127 .name = "snapshot", 3128 .type = QEMU_OPT_BOOL, 3129 .help = "enable/disable snapshot mode", 3130 },{ 3131 .name = "discard", 3132 .type = QEMU_OPT_STRING, 3133 .help = "discard operation (ignore/off, unmap/on)", 3134 },{ 3135 .name = BDRV_OPT_CACHE_WB, 3136 .type = QEMU_OPT_BOOL, 3137 .help = "enables writeback mode for any caches", 3138 },{ 3139 .name = BDRV_OPT_CACHE_DIRECT, 3140 .type = QEMU_OPT_BOOL, 3141 .help = "enables use of O_DIRECT (bypass the host page cache)", 3142 },{ 3143 .name = BDRV_OPT_CACHE_NO_FLUSH, 3144 .type = QEMU_OPT_BOOL, 3145 .help = "ignore any flush requests for the device", 3146 },{ 3147 .name = "aio", 3148 .type = QEMU_OPT_STRING, 3149 .help = "host AIO implementation (threads, native)", 3150 },{ 3151 .name = "format", 3152 .type = QEMU_OPT_STRING, 3153 .help = "disk format (raw, qcow2, ...)", 3154 },{ 3155 .name = "rerror", 3156 .type = QEMU_OPT_STRING, 3157 .help = "read error action", 3158 },{ 3159 .name = "werror", 3160 .type = QEMU_OPT_STRING, 3161 .help = "write error action", 3162 },{ 3163 .name = "read-only", 3164 .type = QEMU_OPT_BOOL, 3165 .help = "open drive file as read-only", 3166 },{ 3167 .name = "throttling.iops-total", 3168 .type = QEMU_OPT_NUMBER, 3169 .help = "limit total I/O operations per second", 3170 },{ 3171 .name = "throttling.iops-read", 3172 .type = QEMU_OPT_NUMBER, 3173 .help = "limit read operations per second", 3174 },{ 3175 .name = "throttling.iops-write", 3176 .type = QEMU_OPT_NUMBER, 3177 .help = "limit write operations per second", 3178 },{ 3179 .name = "throttling.bps-total", 3180 .type = QEMU_OPT_NUMBER, 3181 .help = "limit total bytes per second", 3182 },{ 3183 .name = "throttling.bps-read", 3184 .type = QEMU_OPT_NUMBER, 3185 .help = "limit read bytes per second", 3186 },{ 3187 .name = "throttling.bps-write", 3188 .type = QEMU_OPT_NUMBER, 3189 .help = "limit write bytes per second", 3190 },{ 3191 .name = "throttling.iops-total-max", 3192 .type = QEMU_OPT_NUMBER, 3193 .help = "I/O operations burst", 3194 },{ 3195 .name = "throttling.iops-read-max", 3196 .type = QEMU_OPT_NUMBER, 3197 .help = "I/O operations read burst", 3198 },{ 3199 .name = "throttling.iops-write-max", 3200 .type = QEMU_OPT_NUMBER, 3201 .help = "I/O operations write burst", 3202 },{ 3203 .name = "throttling.bps-total-max", 3204 .type = QEMU_OPT_NUMBER, 3205 .help = "total bytes burst", 3206 },{ 3207 .name = "throttling.bps-read-max", 3208 .type = QEMU_OPT_NUMBER, 3209 .help = "total bytes read burst", 3210 },{ 3211 .name = "throttling.bps-write-max", 3212 .type = QEMU_OPT_NUMBER, 3213 .help = "total bytes write burst", 3214 },{ 3215 .name = "throttling.iops-size", 3216 .type = QEMU_OPT_NUMBER, 3217 .help = "when limiting by iops max size of an I/O in bytes", 3218 },{ 3219 .name = "throttling.group", 3220 .type = QEMU_OPT_STRING, 3221 .help = "name of the block throttling group", 3222 },{ 3223 .name = "copy-on-read", 3224 .type = QEMU_OPT_BOOL, 3225 .help = "copy read data from backing file into image file", 3226 },{ 3227 .name = "detect-zeroes", 3228 .type = QEMU_OPT_STRING, 3229 .help = "try to optimize zero writes (off, on, unmap)", 3230 }, 3231 { /* end of list */ } 3232 }, 3233 }; 3234 3235 QemuOptsList qemu_drive_opts = { 3236 .name = "drive", 3237 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3238 .desc = { 3239 /* 3240 * no elements => accept any params 3241 * validation will happen later 3242 */ 3243 { /* end of list */ } 3244 }, 3245 }; 3246