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/blockdev.h" 34 #include "hw/block/block.h" 35 #include "block/blockjob.h" 36 #include "monitor/monitor.h" 37 #include "qapi/qmp/qerror.h" 38 #include "qemu/option.h" 39 #include "qemu/config-file.h" 40 #include "qapi/qmp/types.h" 41 #include "sysemu/sysemu.h" 42 #include "block/block_int.h" 43 #include "qmp-commands.h" 44 #include "trace.h" 45 #include "sysemu/arch_init.h" 46 47 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 48 extern QemuOptsList qemu_common_drive_opts; 49 50 static const char *const if_name[IF_COUNT] = { 51 [IF_NONE] = "none", 52 [IF_IDE] = "ide", 53 [IF_SCSI] = "scsi", 54 [IF_FLOPPY] = "floppy", 55 [IF_PFLASH] = "pflash", 56 [IF_MTD] = "mtd", 57 [IF_SD] = "sd", 58 [IF_VIRTIO] = "virtio", 59 [IF_XEN] = "xen", 60 }; 61 62 static const int if_max_devs[IF_COUNT] = { 63 /* 64 * Do not change these numbers! They govern how drive option 65 * index maps to unit and bus. That mapping is ABI. 66 * 67 * All controllers used to imlement if=T drives need to support 68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 69 * Otherwise, some index values map to "impossible" bus, unit 70 * values. 71 * 72 * For instance, if you change [IF_SCSI] to 255, -drive 73 * if=scsi,index=12 no longer means bus=1,unit=5, but 74 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 75 * the drive can't be set up. Regression. 76 */ 77 [IF_IDE] = 2, 78 [IF_SCSI] = 7, 79 }; 80 81 /* 82 * We automatically delete the drive when a device using it gets 83 * unplugged. Questionable feature, but we can't just drop it. 84 * Device models call blockdev_mark_auto_del() to schedule the 85 * automatic deletion, and generic qdev code calls blockdev_auto_del() 86 * when deletion is actually safe. 87 */ 88 void blockdev_mark_auto_del(BlockDriverState *bs) 89 { 90 DriveInfo *dinfo = drive_get_by_blockdev(bs); 91 92 if (bs->job) { 93 block_job_cancel(bs->job); 94 } 95 if (dinfo) { 96 dinfo->auto_del = 1; 97 } 98 } 99 100 void blockdev_auto_del(BlockDriverState *bs) 101 { 102 DriveInfo *dinfo = drive_get_by_blockdev(bs); 103 104 if (dinfo && dinfo->auto_del) { 105 drive_put_ref(dinfo); 106 } 107 } 108 109 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 110 { 111 int max_devs = if_max_devs[type]; 112 return max_devs ? index / max_devs : 0; 113 } 114 115 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 116 { 117 int max_devs = if_max_devs[type]; 118 return max_devs ? index % max_devs : index; 119 } 120 121 QemuOpts *drive_def(const char *optstr) 122 { 123 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 124 } 125 126 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 127 const char *optstr) 128 { 129 QemuOpts *opts; 130 char buf[32]; 131 132 opts = drive_def(optstr); 133 if (!opts) { 134 return NULL; 135 } 136 if (type != IF_DEFAULT) { 137 qemu_opt_set(opts, "if", if_name[type]); 138 } 139 if (index >= 0) { 140 snprintf(buf, sizeof(buf), "%d", index); 141 qemu_opt_set(opts, "index", buf); 142 } 143 if (file) 144 qemu_opt_set(opts, "file", file); 145 return opts; 146 } 147 148 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 149 { 150 DriveInfo *dinfo; 151 152 /* seek interface, bus and unit */ 153 154 QTAILQ_FOREACH(dinfo, &drives, next) { 155 if (dinfo->type == type && 156 dinfo->bus == bus && 157 dinfo->unit == unit) 158 return dinfo; 159 } 160 161 return NULL; 162 } 163 164 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 165 { 166 return drive_get(type, 167 drive_index_to_bus_id(type, index), 168 drive_index_to_unit_id(type, index)); 169 } 170 171 int drive_get_max_bus(BlockInterfaceType type) 172 { 173 int max_bus; 174 DriveInfo *dinfo; 175 176 max_bus = -1; 177 QTAILQ_FOREACH(dinfo, &drives, next) { 178 if(dinfo->type == type && 179 dinfo->bus > max_bus) 180 max_bus = dinfo->bus; 181 } 182 return max_bus; 183 } 184 185 /* Get a block device. This should only be used for single-drive devices 186 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 187 appropriate bus. */ 188 DriveInfo *drive_get_next(BlockInterfaceType type) 189 { 190 static int next_block_unit[IF_COUNT]; 191 192 return drive_get(type, 0, next_block_unit[type]++); 193 } 194 195 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 196 { 197 DriveInfo *dinfo; 198 199 QTAILQ_FOREACH(dinfo, &drives, next) { 200 if (dinfo->bdrv == bs) { 201 return dinfo; 202 } 203 } 204 return NULL; 205 } 206 207 static void bdrv_format_print(void *opaque, const char *name) 208 { 209 error_printf(" %s", name); 210 } 211 212 static void drive_uninit(DriveInfo *dinfo) 213 { 214 qemu_opts_del(dinfo->opts); 215 bdrv_unref(dinfo->bdrv); 216 g_free(dinfo->id); 217 QTAILQ_REMOVE(&drives, dinfo, next); 218 g_free(dinfo->serial); 219 g_free(dinfo); 220 } 221 222 void drive_put_ref(DriveInfo *dinfo) 223 { 224 assert(dinfo->refcount); 225 if (--dinfo->refcount == 0) { 226 drive_uninit(dinfo); 227 } 228 } 229 230 void drive_get_ref(DriveInfo *dinfo) 231 { 232 dinfo->refcount++; 233 } 234 235 typedef struct { 236 QEMUBH *bh; 237 BlockDriverState *bs; 238 } BDRVPutRefBH; 239 240 static void bdrv_put_ref_bh(void *opaque) 241 { 242 BDRVPutRefBH *s = opaque; 243 244 bdrv_unref(s->bs); 245 qemu_bh_delete(s->bh); 246 g_free(s); 247 } 248 249 /* 250 * Release a BDS reference in a BH 251 * 252 * It is not safe to use bdrv_unref() from a callback function when the callers 253 * still need the BlockDriverState. In such cases we schedule a BH to release 254 * the reference. 255 */ 256 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 257 { 258 BDRVPutRefBH *s; 259 260 s = g_new(BDRVPutRefBH, 1); 261 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 262 s->bs = bs; 263 qemu_bh_schedule(s->bh); 264 } 265 266 static int parse_block_error_action(const char *buf, bool is_read) 267 { 268 if (!strcmp(buf, "ignore")) { 269 return BLOCKDEV_ON_ERROR_IGNORE; 270 } else if (!is_read && !strcmp(buf, "enospc")) { 271 return BLOCKDEV_ON_ERROR_ENOSPC; 272 } else if (!strcmp(buf, "stop")) { 273 return BLOCKDEV_ON_ERROR_STOP; 274 } else if (!strcmp(buf, "report")) { 275 return BLOCKDEV_ON_ERROR_REPORT; 276 } else { 277 error_report("'%s' invalid %s error action", 278 buf, is_read ? "read" : "write"); 279 return -1; 280 } 281 } 282 283 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 284 { 285 if (throttle_conflicting(cfg)) { 286 error_setg(errp, "bps/iops/max total values and read/write values" 287 " cannot be used at the same time"); 288 return false; 289 } 290 291 if (!throttle_is_valid(cfg)) { 292 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 293 return false; 294 } 295 296 return true; 297 } 298 299 static DriveInfo *blockdev_init(QemuOpts *all_opts, 300 BlockInterfaceType block_default_type) 301 { 302 const char *buf; 303 const char *file = NULL; 304 const char *serial; 305 const char *mediastr = ""; 306 BlockInterfaceType type; 307 enum { MEDIA_DISK, MEDIA_CDROM } media; 308 int bus_id, unit_id; 309 int cyls, heads, secs, translation; 310 int max_devs; 311 int index; 312 int ro = 0; 313 int bdrv_flags = 0; 314 int on_read_error, on_write_error; 315 const char *devaddr; 316 DriveInfo *dinfo; 317 ThrottleConfig cfg; 318 int snapshot = 0; 319 bool copy_on_read; 320 int ret; 321 Error *error = NULL; 322 QemuOpts *opts; 323 QDict *bs_opts; 324 const char *id; 325 bool has_driver_specific_opts; 326 BlockDriver *drv = NULL; 327 328 translation = BIOS_ATA_TRANSLATION_AUTO; 329 media = MEDIA_DISK; 330 331 /* Check common options by copying from all_opts to opts, all other options 332 * are stored in bs_opts. */ 333 id = qemu_opts_id(all_opts); 334 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 335 if (error_is_set(&error)) { 336 qerror_report_err(error); 337 error_free(error); 338 return NULL; 339 } 340 341 bs_opts = qdict_new(); 342 qemu_opts_to_qdict(all_opts, bs_opts); 343 qemu_opts_absorb_qdict(opts, bs_opts, &error); 344 if (error_is_set(&error)) { 345 qerror_report_err(error); 346 error_free(error); 347 return NULL; 348 } 349 350 if (id) { 351 qdict_del(bs_opts, "id"); 352 } 353 354 has_driver_specific_opts = !!qdict_size(bs_opts); 355 356 /* extract parameters */ 357 bus_id = qemu_opt_get_number(opts, "bus", 0); 358 unit_id = qemu_opt_get_number(opts, "unit", -1); 359 index = qemu_opt_get_number(opts, "index", -1); 360 361 cyls = qemu_opt_get_number(opts, "cyls", 0); 362 heads = qemu_opt_get_number(opts, "heads", 0); 363 secs = qemu_opt_get_number(opts, "secs", 0); 364 365 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 366 ro = qemu_opt_get_bool(opts, "read-only", 0); 367 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 368 369 file = qemu_opt_get(opts, "file"); 370 serial = qemu_opt_get(opts, "serial"); 371 372 if ((buf = qemu_opt_get(opts, "if")) != NULL) { 373 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) 374 ; 375 if (type == IF_COUNT) { 376 error_report("unsupported bus type '%s'", buf); 377 return NULL; 378 } 379 } else { 380 type = block_default_type; 381 } 382 383 max_devs = if_max_devs[type]; 384 385 if (cyls || heads || secs) { 386 if (cyls < 1) { 387 error_report("invalid physical cyls number"); 388 return NULL; 389 } 390 if (heads < 1) { 391 error_report("invalid physical heads number"); 392 return NULL; 393 } 394 if (secs < 1) { 395 error_report("invalid physical secs number"); 396 return NULL; 397 } 398 } 399 400 if ((buf = qemu_opt_get(opts, "trans")) != NULL) { 401 if (!cyls) { 402 error_report("'%s' trans must be used with cyls, heads and secs", 403 buf); 404 return NULL; 405 } 406 if (!strcmp(buf, "none")) 407 translation = BIOS_ATA_TRANSLATION_NONE; 408 else if (!strcmp(buf, "lba")) 409 translation = BIOS_ATA_TRANSLATION_LBA; 410 else if (!strcmp(buf, "auto")) 411 translation = BIOS_ATA_TRANSLATION_AUTO; 412 else { 413 error_report("'%s' invalid translation type", buf); 414 return NULL; 415 } 416 } 417 418 if ((buf = qemu_opt_get(opts, "media")) != NULL) { 419 if (!strcmp(buf, "disk")) { 420 media = MEDIA_DISK; 421 } else if (!strcmp(buf, "cdrom")) { 422 if (cyls || secs || heads) { 423 error_report("CHS can't be set with media=%s", buf); 424 return NULL; 425 } 426 media = MEDIA_CDROM; 427 } else { 428 error_report("'%s' invalid media", buf); 429 return NULL; 430 } 431 } 432 433 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 434 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 435 error_report("invalid discard option"); 436 return NULL; 437 } 438 } 439 440 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 441 bdrv_flags |= BDRV_O_CACHE_WB; 442 } 443 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 444 bdrv_flags |= BDRV_O_NOCACHE; 445 } 446 if (qemu_opt_get_bool(opts, "cache.no-flush", true)) { 447 bdrv_flags |= BDRV_O_NO_FLUSH; 448 } 449 450 #ifdef CONFIG_LINUX_AIO 451 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 452 if (!strcmp(buf, "native")) { 453 bdrv_flags |= BDRV_O_NATIVE_AIO; 454 } else if (!strcmp(buf, "threads")) { 455 /* this is the default */ 456 } else { 457 error_report("invalid aio option"); 458 return NULL; 459 } 460 } 461 #endif 462 463 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 464 if (is_help_option(buf)) { 465 error_printf("Supported formats:"); 466 bdrv_iterate_format(bdrv_format_print, NULL); 467 error_printf("\n"); 468 return NULL; 469 } 470 471 drv = bdrv_find_whitelisted_format(buf, ro); 472 if (!drv) { 473 if (!ro && bdrv_find_whitelisted_format(buf, !ro)) { 474 error_report("'%s' can be only used as read-only device.", buf); 475 } else { 476 error_report("'%s' invalid format", buf); 477 } 478 return NULL; 479 } 480 } 481 482 /* disk I/O throttling */ 483 memset(&cfg, 0, sizeof(cfg)); 484 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 485 qemu_opt_get_number(opts, "throttling.bps-total", 0); 486 cfg.buckets[THROTTLE_BPS_READ].avg = 487 qemu_opt_get_number(opts, "throttling.bps-read", 0); 488 cfg.buckets[THROTTLE_BPS_WRITE].avg = 489 qemu_opt_get_number(opts, "throttling.bps-write", 0); 490 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 491 qemu_opt_get_number(opts, "throttling.iops-total", 0); 492 cfg.buckets[THROTTLE_OPS_READ].avg = 493 qemu_opt_get_number(opts, "throttling.iops-read", 0); 494 cfg.buckets[THROTTLE_OPS_WRITE].avg = 495 qemu_opt_get_number(opts, "throttling.iops-write", 0); 496 497 cfg.buckets[THROTTLE_BPS_TOTAL].max = 498 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 499 cfg.buckets[THROTTLE_BPS_READ].max = 500 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 501 cfg.buckets[THROTTLE_BPS_WRITE].max = 502 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 503 cfg.buckets[THROTTLE_OPS_TOTAL].max = 504 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 505 cfg.buckets[THROTTLE_OPS_READ].max = 506 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 507 cfg.buckets[THROTTLE_OPS_WRITE].max = 508 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 509 510 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 511 512 if (!check_throttle_config(&cfg, &error)) { 513 error_report("%s", error_get_pretty(error)); 514 error_free(error); 515 return NULL; 516 } 517 518 if (qemu_opt_get(opts, "boot") != NULL) { 519 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 520 "ignored. Future versions will reject this parameter. Please " 521 "update your scripts.\n"); 522 } 523 524 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 525 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 526 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 527 error_report("werror is not supported by this bus type"); 528 return NULL; 529 } 530 531 on_write_error = parse_block_error_action(buf, 0); 532 if (on_write_error < 0) { 533 return NULL; 534 } 535 } 536 537 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 538 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 539 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 540 error_report("rerror is not supported by this bus type"); 541 return NULL; 542 } 543 544 on_read_error = parse_block_error_action(buf, 1); 545 if (on_read_error < 0) { 546 return NULL; 547 } 548 } 549 550 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { 551 if (type != IF_VIRTIO) { 552 error_report("addr is not supported by this bus type"); 553 return NULL; 554 } 555 } 556 557 /* compute bus and unit according index */ 558 559 if (index != -1) { 560 if (bus_id != 0 || unit_id != -1) { 561 error_report("index cannot be used with bus and unit"); 562 return NULL; 563 } 564 bus_id = drive_index_to_bus_id(type, index); 565 unit_id = drive_index_to_unit_id(type, index); 566 } 567 568 /* if user doesn't specify a unit_id, 569 * try to find the first free 570 */ 571 572 if (unit_id == -1) { 573 unit_id = 0; 574 while (drive_get(type, bus_id, unit_id) != NULL) { 575 unit_id++; 576 if (max_devs && unit_id >= max_devs) { 577 unit_id -= max_devs; 578 bus_id++; 579 } 580 } 581 } 582 583 /* check unit id */ 584 585 if (max_devs && unit_id >= max_devs) { 586 error_report("unit %d too big (max is %d)", 587 unit_id, max_devs - 1); 588 return NULL; 589 } 590 591 /* 592 * catch multiple definitions 593 */ 594 595 if (drive_get(type, bus_id, unit_id) != NULL) { 596 error_report("drive with bus=%d, unit=%d (index=%d) exists", 597 bus_id, unit_id, index); 598 return NULL; 599 } 600 601 /* init */ 602 603 dinfo = g_malloc0(sizeof(*dinfo)); 604 if ((buf = qemu_opts_id(opts)) != NULL) { 605 dinfo->id = g_strdup(buf); 606 } else { 607 /* no id supplied -> create one */ 608 dinfo->id = g_malloc0(32); 609 if (type == IF_IDE || type == IF_SCSI) 610 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 611 if (max_devs) 612 snprintf(dinfo->id, 32, "%s%i%s%i", 613 if_name[type], bus_id, mediastr, unit_id); 614 else 615 snprintf(dinfo->id, 32, "%s%s%i", 616 if_name[type], mediastr, unit_id); 617 } 618 dinfo->bdrv = bdrv_new(dinfo->id); 619 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 620 dinfo->bdrv->read_only = ro; 621 dinfo->devaddr = devaddr; 622 dinfo->type = type; 623 dinfo->bus = bus_id; 624 dinfo->unit = unit_id; 625 dinfo->cyls = cyls; 626 dinfo->heads = heads; 627 dinfo->secs = secs; 628 dinfo->trans = translation; 629 dinfo->opts = all_opts; 630 dinfo->refcount = 1; 631 if (serial != NULL) { 632 dinfo->serial = g_strdup(serial); 633 } 634 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 635 636 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 637 638 /* disk I/O throttling */ 639 if (throttle_enabled(&cfg)) { 640 bdrv_io_limits_enable(dinfo->bdrv); 641 bdrv_set_io_limits(dinfo->bdrv, &cfg); 642 } 643 644 switch(type) { 645 case IF_IDE: 646 case IF_SCSI: 647 case IF_XEN: 648 case IF_NONE: 649 dinfo->media_cd = media == MEDIA_CDROM; 650 break; 651 case IF_SD: 652 case IF_FLOPPY: 653 case IF_PFLASH: 654 case IF_MTD: 655 break; 656 case IF_VIRTIO: 657 { 658 /* add virtio block device */ 659 QemuOpts *devopts; 660 devopts = qemu_opts_create_nofail(qemu_find_opts("device")); 661 if (arch_type == QEMU_ARCH_S390X) { 662 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 663 } else { 664 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 665 } 666 qemu_opt_set(devopts, "drive", dinfo->id); 667 if (devaddr) 668 qemu_opt_set(devopts, "addr", devaddr); 669 break; 670 } 671 default: 672 abort(); 673 } 674 if (!file || !*file) { 675 if (has_driver_specific_opts) { 676 file = NULL; 677 } else { 678 return dinfo; 679 } 680 } 681 if (snapshot) { 682 /* always use cache=unsafe with snapshot */ 683 bdrv_flags &= ~BDRV_O_CACHE_MASK; 684 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 685 } 686 687 if (copy_on_read) { 688 bdrv_flags |= BDRV_O_COPY_ON_READ; 689 } 690 691 if (runstate_check(RUN_STATE_INMIGRATE)) { 692 bdrv_flags |= BDRV_O_INCOMING; 693 } 694 695 if (media == MEDIA_CDROM) { 696 /* CDROM is fine for any interface, don't check. */ 697 ro = 1; 698 } else if (ro == 1) { 699 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && 700 type != IF_NONE && type != IF_PFLASH) { 701 error_report("read-only not supported by this bus type"); 702 goto err; 703 } 704 } 705 706 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 707 708 if (ro && copy_on_read) { 709 error_report("warning: disabling copy_on_read on read-only drive"); 710 } 711 712 QINCREF(bs_opts); 713 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv); 714 715 if (ret < 0) { 716 if (ret == -EMEDIUMTYPE) { 717 error_report("could not open disk image %s: not in %s format", 718 file ?: dinfo->id, drv ? drv->format_name : 719 qdict_get_str(bs_opts, "driver")); 720 } else { 721 error_report("could not open disk image %s: %s", 722 file ?: dinfo->id, strerror(-ret)); 723 } 724 goto err; 725 } 726 727 if (bdrv_key_required(dinfo->bdrv)) 728 autostart = 0; 729 730 QDECREF(bs_opts); 731 qemu_opts_del(opts); 732 733 return dinfo; 734 735 err: 736 qemu_opts_del(opts); 737 QDECREF(bs_opts); 738 bdrv_unref(dinfo->bdrv); 739 g_free(dinfo->id); 740 QTAILQ_REMOVE(&drives, dinfo, next); 741 g_free(dinfo); 742 return NULL; 743 } 744 745 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to) 746 { 747 const char *value; 748 749 value = qemu_opt_get(opts, from); 750 if (value) { 751 qemu_opt_set(opts, to, value); 752 qemu_opt_unset(opts, from); 753 } 754 } 755 756 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type) 757 { 758 const char *value; 759 760 /* Change legacy command line options into QMP ones */ 761 qemu_opt_rename(all_opts, "iops", "throttling.iops-total"); 762 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read"); 763 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write"); 764 765 qemu_opt_rename(all_opts, "bps", "throttling.bps-total"); 766 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read"); 767 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write"); 768 769 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max"); 770 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max"); 771 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max"); 772 773 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max"); 774 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max"); 775 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max"); 776 777 qemu_opt_rename(all_opts, 778 "iops_size", "throttling.iops-size"); 779 780 qemu_opt_rename(all_opts, "readonly", "read-only"); 781 782 value = qemu_opt_get(all_opts, "cache"); 783 if (value) { 784 int flags = 0; 785 786 if (bdrv_parse_cache_flags(value, &flags) != 0) { 787 error_report("invalid cache option"); 788 return NULL; 789 } 790 791 /* Specific options take precedence */ 792 if (!qemu_opt_get(all_opts, "cache.writeback")) { 793 qemu_opt_set_bool(all_opts, "cache.writeback", 794 !!(flags & BDRV_O_CACHE_WB)); 795 } 796 if (!qemu_opt_get(all_opts, "cache.direct")) { 797 qemu_opt_set_bool(all_opts, "cache.direct", 798 !!(flags & BDRV_O_NOCACHE)); 799 } 800 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 801 qemu_opt_set_bool(all_opts, "cache.no-flush", 802 !!(flags & BDRV_O_NO_FLUSH)); 803 } 804 qemu_opt_unset(all_opts, "cache"); 805 } 806 807 return blockdev_init(all_opts, block_default_type); 808 } 809 810 void do_commit(Monitor *mon, const QDict *qdict) 811 { 812 const char *device = qdict_get_str(qdict, "device"); 813 BlockDriverState *bs; 814 int ret; 815 816 if (!strcmp(device, "all")) { 817 ret = bdrv_commit_all(); 818 } else { 819 bs = bdrv_find(device); 820 if (!bs) { 821 monitor_printf(mon, "Device '%s' not found\n", device); 822 return; 823 } 824 ret = bdrv_commit(bs); 825 } 826 if (ret < 0) { 827 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 828 strerror(-ret)); 829 } 830 } 831 832 static void blockdev_do_action(int kind, void *data, Error **errp) 833 { 834 TransactionAction action; 835 TransactionActionList list; 836 837 action.kind = kind; 838 action.data = data; 839 list.value = &action; 840 list.next = NULL; 841 qmp_transaction(&list, errp); 842 } 843 844 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, 845 bool has_format, const char *format, 846 bool has_mode, enum NewImageMode mode, 847 Error **errp) 848 { 849 BlockdevSnapshot snapshot = { 850 .device = (char *) device, 851 .snapshot_file = (char *) snapshot_file, 852 .has_format = has_format, 853 .format = (char *) format, 854 .has_mode = has_mode, 855 .mode = mode, 856 }; 857 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 858 &snapshot, errp); 859 } 860 861 862 /* New and old BlockDriverState structs for group snapshots */ 863 864 typedef struct BlkTransactionState BlkTransactionState; 865 866 /* Only prepare() may fail. In a single transaction, only one of commit() or 867 abort() will be called, clean() will always be called if it present. */ 868 typedef struct BdrvActionOps { 869 /* Size of state struct, in bytes. */ 870 size_t instance_size; 871 /* Prepare the work, must NOT be NULL. */ 872 void (*prepare)(BlkTransactionState *common, Error **errp); 873 /* Commit the changes, can be NULL. */ 874 void (*commit)(BlkTransactionState *common); 875 /* Abort the changes on fail, can be NULL. */ 876 void (*abort)(BlkTransactionState *common); 877 /* Clean up resource in the end, can be NULL. */ 878 void (*clean)(BlkTransactionState *common); 879 } BdrvActionOps; 880 881 /* 882 * This structure must be arranged as first member in child type, assuming 883 * that compiler will also arrange it to the same address with parent instance. 884 * Later it will be used in free(). 885 */ 886 struct BlkTransactionState { 887 TransactionAction *action; 888 const BdrvActionOps *ops; 889 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 890 }; 891 892 /* external snapshot private data */ 893 typedef struct ExternalSnapshotState { 894 BlkTransactionState common; 895 BlockDriverState *old_bs; 896 BlockDriverState *new_bs; 897 } ExternalSnapshotState; 898 899 static void external_snapshot_prepare(BlkTransactionState *common, 900 Error **errp) 901 { 902 BlockDriver *drv; 903 int flags, ret; 904 Error *local_err = NULL; 905 const char *device; 906 const char *new_image_file; 907 const char *format = "qcow2"; 908 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 909 ExternalSnapshotState *state = 910 DO_UPCAST(ExternalSnapshotState, common, common); 911 TransactionAction *action = common->action; 912 913 /* get parameters */ 914 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 915 916 device = action->blockdev_snapshot_sync->device; 917 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 918 if (action->blockdev_snapshot_sync->has_format) { 919 format = action->blockdev_snapshot_sync->format; 920 } 921 if (action->blockdev_snapshot_sync->has_mode) { 922 mode = action->blockdev_snapshot_sync->mode; 923 } 924 925 /* start processing */ 926 drv = bdrv_find_format(format); 927 if (!drv) { 928 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 929 return; 930 } 931 932 state->old_bs = bdrv_find(device); 933 if (!state->old_bs) { 934 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 935 return; 936 } 937 938 if (!bdrv_is_inserted(state->old_bs)) { 939 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 940 return; 941 } 942 943 if (bdrv_in_use(state->old_bs)) { 944 error_set(errp, QERR_DEVICE_IN_USE, device); 945 return; 946 } 947 948 if (!bdrv_is_read_only(state->old_bs)) { 949 if (bdrv_flush(state->old_bs)) { 950 error_set(errp, QERR_IO_ERROR); 951 return; 952 } 953 } 954 955 flags = state->old_bs->open_flags; 956 957 /* create new image w/backing file */ 958 if (mode != NEW_IMAGE_MODE_EXISTING) { 959 bdrv_img_create(new_image_file, format, 960 state->old_bs->filename, 961 state->old_bs->drv->format_name, 962 NULL, -1, flags, &local_err, false); 963 if (error_is_set(&local_err)) { 964 error_propagate(errp, local_err); 965 return; 966 } 967 } 968 969 /* We will manually add the backing_hd field to the bs later */ 970 state->new_bs = bdrv_new(""); 971 /* TODO Inherit bs->options or only take explicit options with an 972 * extended QMP command? */ 973 ret = bdrv_open(state->new_bs, new_image_file, NULL, 974 flags | BDRV_O_NO_BACKING, drv); 975 if (ret != 0) { 976 error_setg_file_open(errp, -ret, new_image_file); 977 } 978 } 979 980 static void external_snapshot_commit(BlkTransactionState *common) 981 { 982 ExternalSnapshotState *state = 983 DO_UPCAST(ExternalSnapshotState, common, common); 984 985 /* This removes our old bs and adds the new bs */ 986 bdrv_append(state->new_bs, state->old_bs); 987 /* We don't need (or want) to use the transactional 988 * bdrv_reopen_multiple() across all the entries at once, because we 989 * don't want to abort all of them if one of them fails the reopen */ 990 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 991 NULL); 992 } 993 994 static void external_snapshot_abort(BlkTransactionState *common) 995 { 996 ExternalSnapshotState *state = 997 DO_UPCAST(ExternalSnapshotState, common, common); 998 if (state->new_bs) { 999 bdrv_unref(state->new_bs); 1000 } 1001 } 1002 1003 typedef struct DriveBackupState { 1004 BlkTransactionState common; 1005 BlockDriverState *bs; 1006 BlockJob *job; 1007 } DriveBackupState; 1008 1009 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1010 { 1011 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1012 DriveBackup *backup; 1013 Error *local_err = NULL; 1014 1015 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1016 backup = common->action->drive_backup; 1017 1018 qmp_drive_backup(backup->device, backup->target, 1019 backup->has_format, backup->format, 1020 backup->sync, 1021 backup->has_mode, backup->mode, 1022 backup->has_speed, backup->speed, 1023 backup->has_on_source_error, backup->on_source_error, 1024 backup->has_on_target_error, backup->on_target_error, 1025 &local_err); 1026 if (error_is_set(&local_err)) { 1027 error_propagate(errp, local_err); 1028 state->bs = NULL; 1029 state->job = NULL; 1030 return; 1031 } 1032 1033 state->bs = bdrv_find(backup->device); 1034 state->job = state->bs->job; 1035 } 1036 1037 static void drive_backup_abort(BlkTransactionState *common) 1038 { 1039 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1040 BlockDriverState *bs = state->bs; 1041 1042 /* Only cancel if it's the job we started */ 1043 if (bs && bs->job && bs->job == state->job) { 1044 block_job_cancel_sync(bs->job); 1045 } 1046 } 1047 1048 static void abort_prepare(BlkTransactionState *common, Error **errp) 1049 { 1050 error_setg(errp, "Transaction aborted using Abort action"); 1051 } 1052 1053 static void abort_commit(BlkTransactionState *common) 1054 { 1055 g_assert_not_reached(); /* this action never succeeds */ 1056 } 1057 1058 static const BdrvActionOps actions[] = { 1059 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1060 .instance_size = sizeof(ExternalSnapshotState), 1061 .prepare = external_snapshot_prepare, 1062 .commit = external_snapshot_commit, 1063 .abort = external_snapshot_abort, 1064 }, 1065 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1066 .instance_size = sizeof(DriveBackupState), 1067 .prepare = drive_backup_prepare, 1068 .abort = drive_backup_abort, 1069 }, 1070 [TRANSACTION_ACTION_KIND_ABORT] = { 1071 .instance_size = sizeof(BlkTransactionState), 1072 .prepare = abort_prepare, 1073 .commit = abort_commit, 1074 }, 1075 }; 1076 1077 /* 1078 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1079 * then we do not pivot any of the devices in the group, and abandon the 1080 * snapshots 1081 */ 1082 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1083 { 1084 TransactionActionList *dev_entry = dev_list; 1085 BlkTransactionState *state, *next; 1086 Error *local_err = NULL; 1087 1088 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1089 QSIMPLEQ_INIT(&snap_bdrv_states); 1090 1091 /* drain all i/o before any snapshots */ 1092 bdrv_drain_all(); 1093 1094 /* We don't do anything in this loop that commits us to the snapshot */ 1095 while (NULL != dev_entry) { 1096 TransactionAction *dev_info = NULL; 1097 const BdrvActionOps *ops; 1098 1099 dev_info = dev_entry->value; 1100 dev_entry = dev_entry->next; 1101 1102 assert(dev_info->kind < ARRAY_SIZE(actions)); 1103 1104 ops = &actions[dev_info->kind]; 1105 state = g_malloc0(ops->instance_size); 1106 state->ops = ops; 1107 state->action = dev_info; 1108 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1109 1110 state->ops->prepare(state, &local_err); 1111 if (error_is_set(&local_err)) { 1112 error_propagate(errp, local_err); 1113 goto delete_and_fail; 1114 } 1115 } 1116 1117 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1118 if (state->ops->commit) { 1119 state->ops->commit(state); 1120 } 1121 } 1122 1123 /* success */ 1124 goto exit; 1125 1126 delete_and_fail: 1127 /* 1128 * failure, and it is all-or-none; abandon each new bs, and keep using 1129 * the original bs for all images 1130 */ 1131 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1132 if (state->ops->abort) { 1133 state->ops->abort(state); 1134 } 1135 } 1136 exit: 1137 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1138 if (state->ops->clean) { 1139 state->ops->clean(state); 1140 } 1141 g_free(state); 1142 } 1143 } 1144 1145 1146 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1147 { 1148 if (bdrv_in_use(bs)) { 1149 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1150 return; 1151 } 1152 if (!bdrv_dev_has_removable_media(bs)) { 1153 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 1154 return; 1155 } 1156 1157 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1158 bdrv_dev_eject_request(bs, force); 1159 if (!force) { 1160 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 1161 return; 1162 } 1163 } 1164 1165 bdrv_close(bs); 1166 } 1167 1168 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1169 { 1170 BlockDriverState *bs; 1171 1172 bs = bdrv_find(device); 1173 if (!bs) { 1174 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1175 return; 1176 } 1177 1178 eject_device(bs, force, errp); 1179 } 1180 1181 void qmp_block_passwd(const char *device, const char *password, Error **errp) 1182 { 1183 BlockDriverState *bs; 1184 int err; 1185 1186 bs = bdrv_find(device); 1187 if (!bs) { 1188 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1189 return; 1190 } 1191 1192 err = bdrv_set_key(bs, password); 1193 if (err == -EINVAL) { 1194 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1195 return; 1196 } else if (err < 0) { 1197 error_set(errp, QERR_INVALID_PASSWORD); 1198 return; 1199 } 1200 } 1201 1202 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1203 int bdrv_flags, BlockDriver *drv, 1204 const char *password, Error **errp) 1205 { 1206 int ret; 1207 1208 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv); 1209 if (ret < 0) { 1210 error_setg_file_open(errp, -ret, filename); 1211 return; 1212 } 1213 1214 if (bdrv_key_required(bs)) { 1215 if (password) { 1216 if (bdrv_set_key(bs, password) < 0) { 1217 error_set(errp, QERR_INVALID_PASSWORD); 1218 } 1219 } else { 1220 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1221 bdrv_get_encrypted_filename(bs)); 1222 } 1223 } else if (password) { 1224 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1225 } 1226 } 1227 1228 void qmp_change_blockdev(const char *device, const char *filename, 1229 bool has_format, const char *format, Error **errp) 1230 { 1231 BlockDriverState *bs; 1232 BlockDriver *drv = NULL; 1233 int bdrv_flags; 1234 Error *err = NULL; 1235 1236 bs = bdrv_find(device); 1237 if (!bs) { 1238 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1239 return; 1240 } 1241 1242 if (format) { 1243 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1244 if (!drv) { 1245 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1246 return; 1247 } 1248 } 1249 1250 eject_device(bs, 0, &err); 1251 if (error_is_set(&err)) { 1252 error_propagate(errp, err); 1253 return; 1254 } 1255 1256 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1257 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1258 1259 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1260 } 1261 1262 /* throttling disk I/O limits */ 1263 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1264 int64_t bps_wr, 1265 int64_t iops, 1266 int64_t iops_rd, 1267 int64_t iops_wr, 1268 bool has_bps_max, 1269 int64_t bps_max, 1270 bool has_bps_rd_max, 1271 int64_t bps_rd_max, 1272 bool has_bps_wr_max, 1273 int64_t bps_wr_max, 1274 bool has_iops_max, 1275 int64_t iops_max, 1276 bool has_iops_rd_max, 1277 int64_t iops_rd_max, 1278 bool has_iops_wr_max, 1279 int64_t iops_wr_max, 1280 bool has_iops_size, 1281 int64_t iops_size, Error **errp) 1282 { 1283 ThrottleConfig cfg; 1284 BlockDriverState *bs; 1285 1286 bs = bdrv_find(device); 1287 if (!bs) { 1288 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1289 return; 1290 } 1291 1292 memset(&cfg, 0, sizeof(cfg)); 1293 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1294 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1295 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1296 1297 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1298 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1299 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1300 1301 if (has_bps_max) { 1302 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1303 } 1304 if (has_bps_rd_max) { 1305 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1306 } 1307 if (has_bps_wr_max) { 1308 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1309 } 1310 if (has_iops_max) { 1311 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1312 } 1313 if (has_iops_rd_max) { 1314 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1315 } 1316 if (has_iops_wr_max) { 1317 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1318 } 1319 1320 if (has_iops_size) { 1321 cfg.op_size = iops_size; 1322 } 1323 1324 if (!check_throttle_config(&cfg, errp)) { 1325 return; 1326 } 1327 1328 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1329 bdrv_io_limits_enable(bs); 1330 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1331 bdrv_io_limits_disable(bs); 1332 } 1333 1334 if (bs->io_limits_enabled) { 1335 bdrv_set_io_limits(bs, &cfg); 1336 } 1337 } 1338 1339 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1340 { 1341 const char *id = qdict_get_str(qdict, "id"); 1342 BlockDriverState *bs; 1343 1344 bs = bdrv_find(id); 1345 if (!bs) { 1346 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1347 return -1; 1348 } 1349 if (bdrv_in_use(bs)) { 1350 qerror_report(QERR_DEVICE_IN_USE, id); 1351 return -1; 1352 } 1353 1354 /* quiesce block driver; prevent further io */ 1355 bdrv_drain_all(); 1356 bdrv_flush(bs); 1357 bdrv_close(bs); 1358 1359 /* if we have a device attached to this BlockDriverState 1360 * then we need to make the drive anonymous until the device 1361 * can be removed. If this is a drive with no device backing 1362 * then we can just get rid of the block driver state right here. 1363 */ 1364 if (bdrv_get_attached_dev(bs)) { 1365 bdrv_make_anon(bs); 1366 1367 /* Further I/O must not pause the guest */ 1368 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1369 BLOCKDEV_ON_ERROR_REPORT); 1370 } else { 1371 drive_uninit(drive_get_by_blockdev(bs)); 1372 } 1373 1374 return 0; 1375 } 1376 1377 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1378 { 1379 BlockDriverState *bs; 1380 int ret; 1381 1382 bs = bdrv_find(device); 1383 if (!bs) { 1384 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1385 return; 1386 } 1387 1388 if (size < 0) { 1389 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1390 return; 1391 } 1392 1393 /* complete all in-flight operations before resizing the device */ 1394 bdrv_drain_all(); 1395 1396 ret = bdrv_truncate(bs, size); 1397 switch (ret) { 1398 case 0: 1399 break; 1400 case -ENOMEDIUM: 1401 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1402 break; 1403 case -ENOTSUP: 1404 error_set(errp, QERR_UNSUPPORTED); 1405 break; 1406 case -EACCES: 1407 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1408 break; 1409 case -EBUSY: 1410 error_set(errp, QERR_DEVICE_IN_USE, device); 1411 break; 1412 default: 1413 error_setg_errno(errp, -ret, "Could not resize"); 1414 break; 1415 } 1416 } 1417 1418 static void block_job_cb(void *opaque, int ret) 1419 { 1420 BlockDriverState *bs = opaque; 1421 QObject *obj; 1422 1423 trace_block_job_cb(bs, bs->job, ret); 1424 1425 assert(bs->job); 1426 obj = qobject_from_block_job(bs->job); 1427 if (ret < 0) { 1428 QDict *dict = qobject_to_qdict(obj); 1429 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1430 } 1431 1432 if (block_job_is_cancelled(bs->job)) { 1433 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1434 } else { 1435 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1436 } 1437 qobject_decref(obj); 1438 1439 bdrv_put_ref_bh_schedule(bs); 1440 } 1441 1442 void qmp_block_stream(const char *device, bool has_base, 1443 const char *base, bool has_speed, int64_t speed, 1444 bool has_on_error, BlockdevOnError on_error, 1445 Error **errp) 1446 { 1447 BlockDriverState *bs; 1448 BlockDriverState *base_bs = NULL; 1449 Error *local_err = NULL; 1450 1451 if (!has_on_error) { 1452 on_error = BLOCKDEV_ON_ERROR_REPORT; 1453 } 1454 1455 bs = bdrv_find(device); 1456 if (!bs) { 1457 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1458 return; 1459 } 1460 1461 if (base) { 1462 base_bs = bdrv_find_backing_image(bs, base); 1463 if (base_bs == NULL) { 1464 error_set(errp, QERR_BASE_NOT_FOUND, base); 1465 return; 1466 } 1467 } 1468 1469 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1470 on_error, block_job_cb, bs, &local_err); 1471 if (error_is_set(&local_err)) { 1472 error_propagate(errp, local_err); 1473 return; 1474 } 1475 1476 trace_qmp_block_stream(bs, bs->job); 1477 } 1478 1479 void qmp_block_commit(const char *device, 1480 bool has_base, const char *base, const char *top, 1481 bool has_speed, int64_t speed, 1482 Error **errp) 1483 { 1484 BlockDriverState *bs; 1485 BlockDriverState *base_bs, *top_bs; 1486 Error *local_err = NULL; 1487 /* This will be part of the QMP command, if/when the 1488 * BlockdevOnError change for blkmirror makes it in 1489 */ 1490 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1491 1492 /* drain all i/o before commits */ 1493 bdrv_drain_all(); 1494 1495 bs = bdrv_find(device); 1496 if (!bs) { 1497 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1498 return; 1499 } 1500 1501 /* default top_bs is the active layer */ 1502 top_bs = bs; 1503 1504 if (top) { 1505 if (strcmp(bs->filename, top) != 0) { 1506 top_bs = bdrv_find_backing_image(bs, top); 1507 } 1508 } 1509 1510 if (top_bs == NULL) { 1511 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1512 return; 1513 } 1514 1515 if (has_base && base) { 1516 base_bs = bdrv_find_backing_image(top_bs, base); 1517 } else { 1518 base_bs = bdrv_find_base(top_bs); 1519 } 1520 1521 if (base_bs == NULL) { 1522 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1523 return; 1524 } 1525 1526 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1527 &local_err); 1528 if (local_err != NULL) { 1529 error_propagate(errp, local_err); 1530 return; 1531 } 1532 } 1533 1534 void qmp_drive_backup(const char *device, const char *target, 1535 bool has_format, const char *format, 1536 enum MirrorSyncMode sync, 1537 bool has_mode, enum NewImageMode mode, 1538 bool has_speed, int64_t speed, 1539 bool has_on_source_error, BlockdevOnError on_source_error, 1540 bool has_on_target_error, BlockdevOnError on_target_error, 1541 Error **errp) 1542 { 1543 BlockDriverState *bs; 1544 BlockDriverState *target_bs; 1545 BlockDriverState *source = NULL; 1546 BlockDriver *drv = NULL; 1547 Error *local_err = NULL; 1548 int flags; 1549 int64_t size; 1550 int ret; 1551 1552 if (!has_speed) { 1553 speed = 0; 1554 } 1555 if (!has_on_source_error) { 1556 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1557 } 1558 if (!has_on_target_error) { 1559 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1560 } 1561 if (!has_mode) { 1562 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1563 } 1564 1565 bs = bdrv_find(device); 1566 if (!bs) { 1567 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1568 return; 1569 } 1570 1571 if (!bdrv_is_inserted(bs)) { 1572 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1573 return; 1574 } 1575 1576 if (!has_format) { 1577 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1578 } 1579 if (format) { 1580 drv = bdrv_find_format(format); 1581 if (!drv) { 1582 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1583 return; 1584 } 1585 } 1586 1587 if (bdrv_in_use(bs)) { 1588 error_set(errp, QERR_DEVICE_IN_USE, device); 1589 return; 1590 } 1591 1592 flags = bs->open_flags | BDRV_O_RDWR; 1593 1594 /* See if we have a backing HD we can use to create our new image 1595 * on top of. */ 1596 if (sync == MIRROR_SYNC_MODE_TOP) { 1597 source = bs->backing_hd; 1598 if (!source) { 1599 sync = MIRROR_SYNC_MODE_FULL; 1600 } 1601 } 1602 if (sync == MIRROR_SYNC_MODE_NONE) { 1603 source = bs; 1604 } 1605 1606 size = bdrv_getlength(bs); 1607 if (size < 0) { 1608 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1609 return; 1610 } 1611 1612 if (mode != NEW_IMAGE_MODE_EXISTING) { 1613 assert(format && drv); 1614 if (source) { 1615 bdrv_img_create(target, format, source->filename, 1616 source->drv->format_name, NULL, 1617 size, flags, &local_err, false); 1618 } else { 1619 bdrv_img_create(target, format, NULL, NULL, NULL, 1620 size, flags, &local_err, false); 1621 } 1622 } 1623 1624 if (error_is_set(&local_err)) { 1625 error_propagate(errp, local_err); 1626 return; 1627 } 1628 1629 target_bs = bdrv_new(""); 1630 ret = bdrv_open(target_bs, target, NULL, flags, drv); 1631 if (ret < 0) { 1632 bdrv_unref(target_bs); 1633 error_setg_file_open(errp, -ret, target); 1634 return; 1635 } 1636 1637 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 1638 block_job_cb, bs, &local_err); 1639 if (local_err != NULL) { 1640 bdrv_unref(target_bs); 1641 error_propagate(errp, local_err); 1642 return; 1643 } 1644 } 1645 1646 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 1647 1648 void qmp_drive_mirror(const char *device, const char *target, 1649 bool has_format, const char *format, 1650 enum MirrorSyncMode sync, 1651 bool has_mode, enum NewImageMode mode, 1652 bool has_speed, int64_t speed, 1653 bool has_granularity, uint32_t granularity, 1654 bool has_buf_size, int64_t buf_size, 1655 bool has_on_source_error, BlockdevOnError on_source_error, 1656 bool has_on_target_error, BlockdevOnError on_target_error, 1657 Error **errp) 1658 { 1659 BlockDriverState *bs; 1660 BlockDriverState *source, *target_bs; 1661 BlockDriver *drv = NULL; 1662 Error *local_err = NULL; 1663 int flags; 1664 int64_t size; 1665 int ret; 1666 1667 if (!has_speed) { 1668 speed = 0; 1669 } 1670 if (!has_on_source_error) { 1671 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1672 } 1673 if (!has_on_target_error) { 1674 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1675 } 1676 if (!has_mode) { 1677 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1678 } 1679 if (!has_granularity) { 1680 granularity = 0; 1681 } 1682 if (!has_buf_size) { 1683 buf_size = DEFAULT_MIRROR_BUF_SIZE; 1684 } 1685 1686 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 1687 error_set(errp, QERR_INVALID_PARAMETER, device); 1688 return; 1689 } 1690 if (granularity & (granularity - 1)) { 1691 error_set(errp, QERR_INVALID_PARAMETER, device); 1692 return; 1693 } 1694 1695 bs = bdrv_find(device); 1696 if (!bs) { 1697 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1698 return; 1699 } 1700 1701 if (!bdrv_is_inserted(bs)) { 1702 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1703 return; 1704 } 1705 1706 if (!has_format) { 1707 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1708 } 1709 if (format) { 1710 drv = bdrv_find_format(format); 1711 if (!drv) { 1712 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1713 return; 1714 } 1715 } 1716 1717 if (bdrv_in_use(bs)) { 1718 error_set(errp, QERR_DEVICE_IN_USE, device); 1719 return; 1720 } 1721 1722 flags = bs->open_flags | BDRV_O_RDWR; 1723 source = bs->backing_hd; 1724 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 1725 sync = MIRROR_SYNC_MODE_FULL; 1726 } 1727 1728 size = bdrv_getlength(bs); 1729 if (size < 0) { 1730 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1731 return; 1732 } 1733 1734 if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) { 1735 /* create new image w/o backing file */ 1736 assert(format && drv); 1737 bdrv_img_create(target, format, 1738 NULL, NULL, NULL, size, flags, &local_err, false); 1739 } else { 1740 switch (mode) { 1741 case NEW_IMAGE_MODE_EXISTING: 1742 ret = 0; 1743 break; 1744 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 1745 /* create new image with backing file */ 1746 bdrv_img_create(target, format, 1747 source->filename, 1748 source->drv->format_name, 1749 NULL, size, flags, &local_err, false); 1750 break; 1751 default: 1752 abort(); 1753 } 1754 } 1755 1756 if (error_is_set(&local_err)) { 1757 error_propagate(errp, local_err); 1758 return; 1759 } 1760 1761 /* Mirroring takes care of copy-on-write using the source's backing 1762 * file. 1763 */ 1764 target_bs = bdrv_new(""); 1765 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv); 1766 if (ret < 0) { 1767 bdrv_unref(target_bs); 1768 error_setg_file_open(errp, -ret, target); 1769 return; 1770 } 1771 1772 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 1773 on_source_error, on_target_error, 1774 block_job_cb, bs, &local_err); 1775 if (local_err != NULL) { 1776 bdrv_unref(target_bs); 1777 error_propagate(errp, local_err); 1778 return; 1779 } 1780 } 1781 1782 static BlockJob *find_block_job(const char *device) 1783 { 1784 BlockDriverState *bs; 1785 1786 bs = bdrv_find(device); 1787 if (!bs || !bs->job) { 1788 return NULL; 1789 } 1790 return bs->job; 1791 } 1792 1793 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 1794 { 1795 BlockJob *job = find_block_job(device); 1796 1797 if (!job) { 1798 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1799 return; 1800 } 1801 1802 block_job_set_speed(job, speed, errp); 1803 } 1804 1805 void qmp_block_job_cancel(const char *device, 1806 bool has_force, bool force, Error **errp) 1807 { 1808 BlockJob *job = find_block_job(device); 1809 1810 if (!has_force) { 1811 force = false; 1812 } 1813 1814 if (!job) { 1815 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1816 return; 1817 } 1818 if (job->paused && !force) { 1819 error_set(errp, QERR_BLOCK_JOB_PAUSED, device); 1820 return; 1821 } 1822 1823 trace_qmp_block_job_cancel(job); 1824 block_job_cancel(job); 1825 } 1826 1827 void qmp_block_job_pause(const char *device, Error **errp) 1828 { 1829 BlockJob *job = find_block_job(device); 1830 1831 if (!job) { 1832 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1833 return; 1834 } 1835 1836 trace_qmp_block_job_pause(job); 1837 block_job_pause(job); 1838 } 1839 1840 void qmp_block_job_resume(const char *device, Error **errp) 1841 { 1842 BlockJob *job = find_block_job(device); 1843 1844 if (!job) { 1845 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1846 return; 1847 } 1848 1849 trace_qmp_block_job_resume(job); 1850 block_job_resume(job); 1851 } 1852 1853 void qmp_block_job_complete(const char *device, Error **errp) 1854 { 1855 BlockJob *job = find_block_job(device); 1856 1857 if (!job) { 1858 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1859 return; 1860 } 1861 1862 trace_qmp_block_job_complete(job); 1863 block_job_complete(job, errp); 1864 } 1865 1866 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 1867 { 1868 BlockJobInfoList **prev = opaque; 1869 BlockJob *job = bs->job; 1870 1871 if (job) { 1872 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 1873 elem->value = block_job_query(bs->job); 1874 (*prev)->next = elem; 1875 *prev = elem; 1876 } 1877 } 1878 1879 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 1880 { 1881 /* Dummy is a fake list element for holding the head pointer */ 1882 BlockJobInfoList dummy = {}; 1883 BlockJobInfoList *prev = &dummy; 1884 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 1885 return dummy.next; 1886 } 1887 1888 QemuOptsList qemu_common_drive_opts = { 1889 .name = "drive", 1890 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 1891 .desc = { 1892 { 1893 .name = "bus", 1894 .type = QEMU_OPT_NUMBER, 1895 .help = "bus number", 1896 },{ 1897 .name = "unit", 1898 .type = QEMU_OPT_NUMBER, 1899 .help = "unit number (i.e. lun for scsi)", 1900 },{ 1901 .name = "if", 1902 .type = QEMU_OPT_STRING, 1903 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 1904 },{ 1905 .name = "index", 1906 .type = QEMU_OPT_NUMBER, 1907 .help = "index number", 1908 },{ 1909 .name = "cyls", 1910 .type = QEMU_OPT_NUMBER, 1911 .help = "number of cylinders (ide disk geometry)", 1912 },{ 1913 .name = "heads", 1914 .type = QEMU_OPT_NUMBER, 1915 .help = "number of heads (ide disk geometry)", 1916 },{ 1917 .name = "secs", 1918 .type = QEMU_OPT_NUMBER, 1919 .help = "number of sectors (ide disk geometry)", 1920 },{ 1921 .name = "trans", 1922 .type = QEMU_OPT_STRING, 1923 .help = "chs translation (auto, lba. none)", 1924 },{ 1925 .name = "media", 1926 .type = QEMU_OPT_STRING, 1927 .help = "media type (disk, cdrom)", 1928 },{ 1929 .name = "snapshot", 1930 .type = QEMU_OPT_BOOL, 1931 .help = "enable/disable snapshot mode", 1932 },{ 1933 .name = "file", 1934 .type = QEMU_OPT_STRING, 1935 .help = "disk image", 1936 },{ 1937 .name = "discard", 1938 .type = QEMU_OPT_STRING, 1939 .help = "discard operation (ignore/off, unmap/on)", 1940 },{ 1941 .name = "cache.writeback", 1942 .type = QEMU_OPT_BOOL, 1943 .help = "enables writeback mode for any caches", 1944 },{ 1945 .name = "cache.direct", 1946 .type = QEMU_OPT_BOOL, 1947 .help = "enables use of O_DIRECT (bypass the host page cache)", 1948 },{ 1949 .name = "cache.no-flush", 1950 .type = QEMU_OPT_BOOL, 1951 .help = "ignore any flush requests for the device", 1952 },{ 1953 .name = "aio", 1954 .type = QEMU_OPT_STRING, 1955 .help = "host AIO implementation (threads, native)", 1956 },{ 1957 .name = "format", 1958 .type = QEMU_OPT_STRING, 1959 .help = "disk format (raw, qcow2, ...)", 1960 },{ 1961 .name = "serial", 1962 .type = QEMU_OPT_STRING, 1963 .help = "disk serial number", 1964 },{ 1965 .name = "rerror", 1966 .type = QEMU_OPT_STRING, 1967 .help = "read error action", 1968 },{ 1969 .name = "werror", 1970 .type = QEMU_OPT_STRING, 1971 .help = "write error action", 1972 },{ 1973 .name = "addr", 1974 .type = QEMU_OPT_STRING, 1975 .help = "pci address (virtio only)", 1976 },{ 1977 .name = "read-only", 1978 .type = QEMU_OPT_BOOL, 1979 .help = "open drive file as read-only", 1980 },{ 1981 .name = "throttling.iops-total", 1982 .type = QEMU_OPT_NUMBER, 1983 .help = "limit total I/O operations per second", 1984 },{ 1985 .name = "throttling.iops-read", 1986 .type = QEMU_OPT_NUMBER, 1987 .help = "limit read operations per second", 1988 },{ 1989 .name = "throttling.iops-write", 1990 .type = QEMU_OPT_NUMBER, 1991 .help = "limit write operations per second", 1992 },{ 1993 .name = "throttling.bps-total", 1994 .type = QEMU_OPT_NUMBER, 1995 .help = "limit total bytes per second", 1996 },{ 1997 .name = "throttling.bps-read", 1998 .type = QEMU_OPT_NUMBER, 1999 .help = "limit read bytes per second", 2000 },{ 2001 .name = "throttling.bps-write", 2002 .type = QEMU_OPT_NUMBER, 2003 .help = "limit write bytes per second", 2004 },{ 2005 .name = "throttling.iops-total-max", 2006 .type = QEMU_OPT_NUMBER, 2007 .help = "I/O operations burst", 2008 },{ 2009 .name = "throttling.iops-read-max", 2010 .type = QEMU_OPT_NUMBER, 2011 .help = "I/O operations read burst", 2012 },{ 2013 .name = "throttling.iops-write-max", 2014 .type = QEMU_OPT_NUMBER, 2015 .help = "I/O operations write burst", 2016 },{ 2017 .name = "throttling.bps-total-max", 2018 .type = QEMU_OPT_NUMBER, 2019 .help = "total bytes burst", 2020 },{ 2021 .name = "throttling.bps-read-max", 2022 .type = QEMU_OPT_NUMBER, 2023 .help = "total bytes read burst", 2024 },{ 2025 .name = "throttling.bps-write-max", 2026 .type = QEMU_OPT_NUMBER, 2027 .help = "total bytes write burst", 2028 },{ 2029 .name = "throttling.iops-size", 2030 .type = QEMU_OPT_NUMBER, 2031 .help = "when limiting by iops max size of an I/O in bytes", 2032 },{ 2033 .name = "copy-on-read", 2034 .type = QEMU_OPT_BOOL, 2035 .help = "copy read data from backing file into image file", 2036 },{ 2037 .name = "boot", 2038 .type = QEMU_OPT_BOOL, 2039 .help = "(deprecated, ignored)", 2040 }, 2041 { /* end of list */ } 2042 }, 2043 }; 2044 2045 QemuOptsList qemu_drive_opts = { 2046 .name = "drive", 2047 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2048 .desc = { 2049 /* 2050 * no elements => accept any params 2051 * validation will happen later 2052 */ 2053 { /* end of list */ } 2054 }, 2055 }; 2056