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 10 #include "block.h" 11 #include "blockdev.h" 12 #include "monitor.h" 13 #include "qerror.h" 14 #include "qemu-option.h" 15 #include "qemu-config.h" 16 #include "sysemu.h" 17 #include "block_int.h" 18 #include "qmp-commands.h" 19 20 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 21 22 static const char *const if_name[IF_COUNT] = { 23 [IF_NONE] = "none", 24 [IF_IDE] = "ide", 25 [IF_SCSI] = "scsi", 26 [IF_FLOPPY] = "floppy", 27 [IF_PFLASH] = "pflash", 28 [IF_MTD] = "mtd", 29 [IF_SD] = "sd", 30 [IF_VIRTIO] = "virtio", 31 [IF_XEN] = "xen", 32 }; 33 34 static const int if_max_devs[IF_COUNT] = { 35 /* 36 * Do not change these numbers! They govern how drive option 37 * index maps to unit and bus. That mapping is ABI. 38 * 39 * All controllers used to imlement if=T drives need to support 40 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 41 * Otherwise, some index values map to "impossible" bus, unit 42 * values. 43 * 44 * For instance, if you change [IF_SCSI] to 255, -drive 45 * if=scsi,index=12 no longer means bus=1,unit=5, but 46 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 47 * the drive can't be set up. Regression. 48 */ 49 [IF_IDE] = 2, 50 [IF_SCSI] = 7, 51 }; 52 53 /* 54 * We automatically delete the drive when a device using it gets 55 * unplugged. Questionable feature, but we can't just drop it. 56 * Device models call blockdev_mark_auto_del() to schedule the 57 * automatic deletion, and generic qdev code calls blockdev_auto_del() 58 * when deletion is actually safe. 59 */ 60 void blockdev_mark_auto_del(BlockDriverState *bs) 61 { 62 DriveInfo *dinfo = drive_get_by_blockdev(bs); 63 64 if (dinfo) { 65 dinfo->auto_del = 1; 66 } 67 } 68 69 void blockdev_auto_del(BlockDriverState *bs) 70 { 71 DriveInfo *dinfo = drive_get_by_blockdev(bs); 72 73 if (dinfo && dinfo->auto_del) { 74 drive_put_ref(dinfo); 75 } 76 } 77 78 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 79 { 80 int max_devs = if_max_devs[type]; 81 return max_devs ? index / max_devs : 0; 82 } 83 84 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 85 { 86 int max_devs = if_max_devs[type]; 87 return max_devs ? index % max_devs : index; 88 } 89 90 QemuOpts *drive_def(const char *optstr) 91 { 92 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 93 } 94 95 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 96 const char *optstr) 97 { 98 QemuOpts *opts; 99 char buf[32]; 100 101 opts = drive_def(optstr); 102 if (!opts) { 103 return NULL; 104 } 105 if (type != IF_DEFAULT) { 106 qemu_opt_set(opts, "if", if_name[type]); 107 } 108 if (index >= 0) { 109 snprintf(buf, sizeof(buf), "%d", index); 110 qemu_opt_set(opts, "index", buf); 111 } 112 if (file) 113 qemu_opt_set(opts, "file", file); 114 return opts; 115 } 116 117 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 118 { 119 DriveInfo *dinfo; 120 121 /* seek interface, bus and unit */ 122 123 QTAILQ_FOREACH(dinfo, &drives, next) { 124 if (dinfo->type == type && 125 dinfo->bus == bus && 126 dinfo->unit == unit) 127 return dinfo; 128 } 129 130 return NULL; 131 } 132 133 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 134 { 135 return drive_get(type, 136 drive_index_to_bus_id(type, index), 137 drive_index_to_unit_id(type, index)); 138 } 139 140 int drive_get_max_bus(BlockInterfaceType type) 141 { 142 int max_bus; 143 DriveInfo *dinfo; 144 145 max_bus = -1; 146 QTAILQ_FOREACH(dinfo, &drives, next) { 147 if(dinfo->type == type && 148 dinfo->bus > max_bus) 149 max_bus = dinfo->bus; 150 } 151 return max_bus; 152 } 153 154 /* Get a block device. This should only be used for single-drive devices 155 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 156 appropriate bus. */ 157 DriveInfo *drive_get_next(BlockInterfaceType type) 158 { 159 static int next_block_unit[IF_COUNT]; 160 161 return drive_get(type, 0, next_block_unit[type]++); 162 } 163 164 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 165 { 166 DriveInfo *dinfo; 167 168 QTAILQ_FOREACH(dinfo, &drives, next) { 169 if (dinfo->bdrv == bs) { 170 return dinfo; 171 } 172 } 173 return NULL; 174 } 175 176 static void bdrv_format_print(void *opaque, const char *name) 177 { 178 error_printf(" %s", name); 179 } 180 181 static void drive_uninit(DriveInfo *dinfo) 182 { 183 qemu_opts_del(dinfo->opts); 184 bdrv_delete(dinfo->bdrv); 185 g_free(dinfo->id); 186 QTAILQ_REMOVE(&drives, dinfo, next); 187 g_free(dinfo); 188 } 189 190 void drive_put_ref(DriveInfo *dinfo) 191 { 192 assert(dinfo->refcount); 193 if (--dinfo->refcount == 0) { 194 drive_uninit(dinfo); 195 } 196 } 197 198 void drive_get_ref(DriveInfo *dinfo) 199 { 200 dinfo->refcount++; 201 } 202 203 static int parse_block_error_action(const char *buf, int is_read) 204 { 205 if (!strcmp(buf, "ignore")) { 206 return BLOCK_ERR_IGNORE; 207 } else if (!is_read && !strcmp(buf, "enospc")) { 208 return BLOCK_ERR_STOP_ENOSPC; 209 } else if (!strcmp(buf, "stop")) { 210 return BLOCK_ERR_STOP_ANY; 211 } else if (!strcmp(buf, "report")) { 212 return BLOCK_ERR_REPORT; 213 } else { 214 error_report("'%s' invalid %s error action", 215 buf, is_read ? "read" : "write"); 216 return -1; 217 } 218 } 219 220 static bool do_check_io_limits(BlockIOLimit *io_limits) 221 { 222 bool bps_flag; 223 bool iops_flag; 224 225 assert(io_limits); 226 227 bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0) 228 && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0) 229 || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0)); 230 iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0) 231 && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0) 232 || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0)); 233 if (bps_flag || iops_flag) { 234 return false; 235 } 236 237 return true; 238 } 239 240 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) 241 { 242 const char *buf; 243 const char *file = NULL; 244 char devname[128]; 245 const char *serial; 246 const char *mediastr = ""; 247 BlockInterfaceType type; 248 enum { MEDIA_DISK, MEDIA_CDROM } media; 249 int bus_id, unit_id; 250 int cyls, heads, secs, translation; 251 BlockDriver *drv = NULL; 252 int max_devs; 253 int index; 254 int ro = 0; 255 int bdrv_flags = 0; 256 int on_read_error, on_write_error; 257 const char *devaddr; 258 DriveInfo *dinfo; 259 BlockIOLimit io_limits; 260 int snapshot = 0; 261 bool copy_on_read; 262 int ret; 263 264 translation = BIOS_ATA_TRANSLATION_AUTO; 265 media = MEDIA_DISK; 266 267 /* extract parameters */ 268 bus_id = qemu_opt_get_number(opts, "bus", 0); 269 unit_id = qemu_opt_get_number(opts, "unit", -1); 270 index = qemu_opt_get_number(opts, "index", -1); 271 272 cyls = qemu_opt_get_number(opts, "cyls", 0); 273 heads = qemu_opt_get_number(opts, "heads", 0); 274 secs = qemu_opt_get_number(opts, "secs", 0); 275 276 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 277 ro = qemu_opt_get_bool(opts, "readonly", 0); 278 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 279 280 file = qemu_opt_get(opts, "file"); 281 serial = qemu_opt_get(opts, "serial"); 282 283 if ((buf = qemu_opt_get(opts, "if")) != NULL) { 284 pstrcpy(devname, sizeof(devname), buf); 285 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) 286 ; 287 if (type == IF_COUNT) { 288 error_report("unsupported bus type '%s'", buf); 289 return NULL; 290 } 291 } else { 292 type = default_to_scsi ? IF_SCSI : IF_IDE; 293 pstrcpy(devname, sizeof(devname), if_name[type]); 294 } 295 296 max_devs = if_max_devs[type]; 297 298 if (cyls || heads || secs) { 299 if (cyls < 1 || (type == IF_IDE && cyls > 16383)) { 300 error_report("invalid physical cyls number"); 301 return NULL; 302 } 303 if (heads < 1 || (type == IF_IDE && heads > 16)) { 304 error_report("invalid physical heads number"); 305 return NULL; 306 } 307 if (secs < 1 || (type == IF_IDE && secs > 63)) { 308 error_report("invalid physical secs number"); 309 return NULL; 310 } 311 } 312 313 if ((buf = qemu_opt_get(opts, "trans")) != NULL) { 314 if (!cyls) { 315 error_report("'%s' trans must be used with cyls, heads and secs", 316 buf); 317 return NULL; 318 } 319 if (!strcmp(buf, "none")) 320 translation = BIOS_ATA_TRANSLATION_NONE; 321 else if (!strcmp(buf, "lba")) 322 translation = BIOS_ATA_TRANSLATION_LBA; 323 else if (!strcmp(buf, "auto")) 324 translation = BIOS_ATA_TRANSLATION_AUTO; 325 else { 326 error_report("'%s' invalid translation type", buf); 327 return NULL; 328 } 329 } 330 331 if ((buf = qemu_opt_get(opts, "media")) != NULL) { 332 if (!strcmp(buf, "disk")) { 333 media = MEDIA_DISK; 334 } else if (!strcmp(buf, "cdrom")) { 335 if (cyls || secs || heads) { 336 error_report("CHS can't be set with media=%s", buf); 337 return NULL; 338 } 339 media = MEDIA_CDROM; 340 } else { 341 error_report("'%s' invalid media", buf); 342 return NULL; 343 } 344 } 345 346 if ((buf = qemu_opt_get(opts, "cache")) != NULL) { 347 if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) { 348 error_report("invalid cache option"); 349 return NULL; 350 } 351 } 352 353 #ifdef CONFIG_LINUX_AIO 354 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 355 if (!strcmp(buf, "native")) { 356 bdrv_flags |= BDRV_O_NATIVE_AIO; 357 } else if (!strcmp(buf, "threads")) { 358 /* this is the default */ 359 } else { 360 error_report("invalid aio option"); 361 return NULL; 362 } 363 } 364 #endif 365 366 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 367 if (strcmp(buf, "?") == 0) { 368 error_printf("Supported formats:"); 369 bdrv_iterate_format(bdrv_format_print, NULL); 370 error_printf("\n"); 371 return NULL; 372 } 373 drv = bdrv_find_whitelisted_format(buf); 374 if (!drv) { 375 error_report("'%s' invalid format", buf); 376 return NULL; 377 } 378 } 379 380 /* disk I/O throttling */ 381 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = 382 qemu_opt_get_number(opts, "bps", 0); 383 io_limits.bps[BLOCK_IO_LIMIT_READ] = 384 qemu_opt_get_number(opts, "bps_rd", 0); 385 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = 386 qemu_opt_get_number(opts, "bps_wr", 0); 387 io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = 388 qemu_opt_get_number(opts, "iops", 0); 389 io_limits.iops[BLOCK_IO_LIMIT_READ] = 390 qemu_opt_get_number(opts, "iops_rd", 0); 391 io_limits.iops[BLOCK_IO_LIMIT_WRITE] = 392 qemu_opt_get_number(opts, "iops_wr", 0); 393 394 if (!do_check_io_limits(&io_limits)) { 395 error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) " 396 "cannot be used at the same time"); 397 return NULL; 398 } 399 400 on_write_error = BLOCK_ERR_STOP_ENOSPC; 401 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 402 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 403 error_report("werror is not supported by this bus type"); 404 return NULL; 405 } 406 407 on_write_error = parse_block_error_action(buf, 0); 408 if (on_write_error < 0) { 409 return NULL; 410 } 411 } 412 413 on_read_error = BLOCK_ERR_REPORT; 414 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 415 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 416 error_report("rerror is not supported by this bus type"); 417 return NULL; 418 } 419 420 on_read_error = parse_block_error_action(buf, 1); 421 if (on_read_error < 0) { 422 return NULL; 423 } 424 } 425 426 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { 427 if (type != IF_VIRTIO) { 428 error_report("addr is not supported by this bus type"); 429 return NULL; 430 } 431 } 432 433 /* compute bus and unit according index */ 434 435 if (index != -1) { 436 if (bus_id != 0 || unit_id != -1) { 437 error_report("index cannot be used with bus and unit"); 438 return NULL; 439 } 440 bus_id = drive_index_to_bus_id(type, index); 441 unit_id = drive_index_to_unit_id(type, index); 442 } 443 444 /* if user doesn't specify a unit_id, 445 * try to find the first free 446 */ 447 448 if (unit_id == -1) { 449 unit_id = 0; 450 while (drive_get(type, bus_id, unit_id) != NULL) { 451 unit_id++; 452 if (max_devs && unit_id >= max_devs) { 453 unit_id -= max_devs; 454 bus_id++; 455 } 456 } 457 } 458 459 /* check unit id */ 460 461 if (max_devs && unit_id >= max_devs) { 462 error_report("unit %d too big (max is %d)", 463 unit_id, max_devs - 1); 464 return NULL; 465 } 466 467 /* 468 * catch multiple definitions 469 */ 470 471 if (drive_get(type, bus_id, unit_id) != NULL) { 472 error_report("drive with bus=%d, unit=%d (index=%d) exists", 473 bus_id, unit_id, index); 474 return NULL; 475 } 476 477 /* init */ 478 479 dinfo = g_malloc0(sizeof(*dinfo)); 480 if ((buf = qemu_opts_id(opts)) != NULL) { 481 dinfo->id = g_strdup(buf); 482 } else { 483 /* no id supplied -> create one */ 484 dinfo->id = g_malloc0(32); 485 if (type == IF_IDE || type == IF_SCSI) 486 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 487 if (max_devs) 488 snprintf(dinfo->id, 32, "%s%i%s%i", 489 devname, bus_id, mediastr, unit_id); 490 else 491 snprintf(dinfo->id, 32, "%s%s%i", 492 devname, mediastr, unit_id); 493 } 494 dinfo->bdrv = bdrv_new(dinfo->id); 495 dinfo->devaddr = devaddr; 496 dinfo->type = type; 497 dinfo->bus = bus_id; 498 dinfo->unit = unit_id; 499 dinfo->opts = opts; 500 dinfo->refcount = 1; 501 if (serial) 502 strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1); 503 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 504 505 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 506 507 /* disk I/O throttling */ 508 bdrv_set_io_limits(dinfo->bdrv, &io_limits); 509 510 switch(type) { 511 case IF_IDE: 512 case IF_SCSI: 513 case IF_XEN: 514 case IF_NONE: 515 switch(media) { 516 case MEDIA_DISK: 517 if (cyls != 0) { 518 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs); 519 bdrv_set_translation_hint(dinfo->bdrv, translation); 520 } 521 break; 522 case MEDIA_CDROM: 523 dinfo->media_cd = 1; 524 break; 525 } 526 break; 527 case IF_SD: 528 case IF_FLOPPY: 529 case IF_PFLASH: 530 case IF_MTD: 531 break; 532 case IF_VIRTIO: 533 /* add virtio block device */ 534 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0); 535 qemu_opt_set(opts, "driver", "virtio-blk"); 536 qemu_opt_set(opts, "drive", dinfo->id); 537 if (devaddr) 538 qemu_opt_set(opts, "addr", devaddr); 539 break; 540 default: 541 abort(); 542 } 543 if (!file || !*file) { 544 return dinfo; 545 } 546 if (snapshot) { 547 /* always use cache=unsafe with snapshot */ 548 bdrv_flags &= ~BDRV_O_CACHE_MASK; 549 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 550 } 551 552 if (copy_on_read) { 553 bdrv_flags |= BDRV_O_COPY_ON_READ; 554 } 555 556 if (media == MEDIA_CDROM) { 557 /* CDROM is fine for any interface, don't check. */ 558 ro = 1; 559 } else if (ro == 1) { 560 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && type != IF_NONE) { 561 error_report("readonly not supported by this bus type"); 562 goto err; 563 } 564 } 565 566 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 567 568 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); 569 if (ret < 0) { 570 error_report("could not open disk image %s: %s", 571 file, strerror(-ret)); 572 goto err; 573 } 574 575 if (bdrv_key_required(dinfo->bdrv)) 576 autostart = 0; 577 return dinfo; 578 579 err: 580 bdrv_delete(dinfo->bdrv); 581 g_free(dinfo->id); 582 QTAILQ_REMOVE(&drives, dinfo, next); 583 g_free(dinfo); 584 return NULL; 585 } 586 587 void do_commit(Monitor *mon, const QDict *qdict) 588 { 589 const char *device = qdict_get_str(qdict, "device"); 590 BlockDriverState *bs; 591 592 if (!strcmp(device, "all")) { 593 bdrv_commit_all(); 594 } else { 595 bs = bdrv_find(device); 596 if (!bs) { 597 qerror_report(QERR_DEVICE_NOT_FOUND, device); 598 return; 599 } 600 bdrv_commit(bs); 601 } 602 } 603 604 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, 605 bool has_format, const char *format, 606 Error **errp) 607 { 608 BlockDriverState *bs; 609 BlockDriver *drv, *old_drv, *proto_drv; 610 int ret = 0; 611 int flags; 612 char old_filename[1024]; 613 614 bs = bdrv_find(device); 615 if (!bs) { 616 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 617 return; 618 } 619 620 pstrcpy(old_filename, sizeof(old_filename), bs->filename); 621 622 old_drv = bs->drv; 623 flags = bs->open_flags; 624 625 if (!has_format) { 626 format = "qcow2"; 627 } 628 629 drv = bdrv_find_format(format); 630 if (!drv) { 631 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 632 return; 633 } 634 635 proto_drv = bdrv_find_protocol(snapshot_file); 636 if (!proto_drv) { 637 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 638 return; 639 } 640 641 ret = bdrv_img_create(snapshot_file, format, bs->filename, 642 bs->drv->format_name, NULL, -1, flags); 643 if (ret) { 644 error_set(errp, QERR_UNDEFINED_ERROR); 645 return; 646 } 647 648 bdrv_drain_all(); 649 bdrv_flush(bs); 650 651 bdrv_close(bs); 652 ret = bdrv_open(bs, snapshot_file, flags, drv); 653 /* 654 * If reopening the image file we just created fails, fall back 655 * and try to re-open the original image. If that fails too, we 656 * are in serious trouble. 657 */ 658 if (ret != 0) { 659 ret = bdrv_open(bs, old_filename, flags, old_drv); 660 if (ret != 0) { 661 error_set(errp, QERR_OPEN_FILE_FAILED, old_filename); 662 } else { 663 error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file); 664 } 665 } 666 } 667 668 static int eject_device(Monitor *mon, BlockDriverState *bs, int force) 669 { 670 if (!bdrv_dev_has_removable_media(bs)) { 671 qerror_report(QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 672 return -1; 673 } 674 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 675 bdrv_dev_eject_request(bs, force); 676 if (!force) { 677 qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 678 return -1; 679 } 680 } 681 bdrv_close(bs); 682 return 0; 683 } 684 685 int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data) 686 { 687 BlockDriverState *bs; 688 int force = qdict_get_try_bool(qdict, "force", 0); 689 const char *filename = qdict_get_str(qdict, "device"); 690 691 bs = bdrv_find(filename); 692 if (!bs) { 693 qerror_report(QERR_DEVICE_NOT_FOUND, filename); 694 return -1; 695 } 696 return eject_device(mon, bs, force); 697 } 698 699 void qmp_block_passwd(const char *device, const char *password, Error **errp) 700 { 701 BlockDriverState *bs; 702 int err; 703 704 bs = bdrv_find(device); 705 if (!bs) { 706 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 707 return; 708 } 709 710 err = bdrv_set_key(bs, password); 711 if (err == -EINVAL) { 712 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 713 return; 714 } else if (err < 0) { 715 error_set(errp, QERR_INVALID_PASSWORD); 716 return; 717 } 718 } 719 720 int do_change_block(Monitor *mon, const char *device, 721 const char *filename, const char *fmt) 722 { 723 BlockDriverState *bs; 724 BlockDriver *drv = NULL; 725 int bdrv_flags; 726 727 bs = bdrv_find(device); 728 if (!bs) { 729 qerror_report(QERR_DEVICE_NOT_FOUND, device); 730 return -1; 731 } 732 if (fmt) { 733 drv = bdrv_find_whitelisted_format(fmt); 734 if (!drv) { 735 qerror_report(QERR_INVALID_BLOCK_FORMAT, fmt); 736 return -1; 737 } 738 } 739 if (eject_device(mon, bs, 0) < 0) { 740 return -1; 741 } 742 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 743 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 744 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { 745 qerror_report(QERR_OPEN_FILE_FAILED, filename); 746 return -1; 747 } 748 return monitor_read_bdrv_key_start(mon, bs, NULL, NULL); 749 } 750 751 /* throttling disk I/O limits */ 752 int do_block_set_io_throttle(Monitor *mon, 753 const QDict *qdict, QObject **ret_data) 754 { 755 BlockIOLimit io_limits; 756 const char *devname = qdict_get_str(qdict, "device"); 757 BlockDriverState *bs; 758 759 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] 760 = qdict_get_try_int(qdict, "bps", -1); 761 io_limits.bps[BLOCK_IO_LIMIT_READ] 762 = qdict_get_try_int(qdict, "bps_rd", -1); 763 io_limits.bps[BLOCK_IO_LIMIT_WRITE] 764 = qdict_get_try_int(qdict, "bps_wr", -1); 765 io_limits.iops[BLOCK_IO_LIMIT_TOTAL] 766 = qdict_get_try_int(qdict, "iops", -1); 767 io_limits.iops[BLOCK_IO_LIMIT_READ] 768 = qdict_get_try_int(qdict, "iops_rd", -1); 769 io_limits.iops[BLOCK_IO_LIMIT_WRITE] 770 = qdict_get_try_int(qdict, "iops_wr", -1); 771 772 bs = bdrv_find(devname); 773 if (!bs) { 774 qerror_report(QERR_DEVICE_NOT_FOUND, devname); 775 return -1; 776 } 777 778 if ((io_limits.bps[BLOCK_IO_LIMIT_TOTAL] == -1) 779 || (io_limits.bps[BLOCK_IO_LIMIT_READ] == -1) 780 || (io_limits.bps[BLOCK_IO_LIMIT_WRITE] == -1) 781 || (io_limits.iops[BLOCK_IO_LIMIT_TOTAL] == -1) 782 || (io_limits.iops[BLOCK_IO_LIMIT_READ] == -1) 783 || (io_limits.iops[BLOCK_IO_LIMIT_WRITE] == -1)) { 784 qerror_report(QERR_MISSING_PARAMETER, 785 "bps/bps_rd/bps_wr/iops/iops_rd/iops_wr"); 786 return -1; 787 } 788 789 if (!do_check_io_limits(&io_limits)) { 790 qerror_report(QERR_INVALID_PARAMETER_COMBINATION); 791 return -1; 792 } 793 794 bs->io_limits = io_limits; 795 bs->slice_time = BLOCK_IO_SLICE_TIME; 796 797 if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) { 798 bdrv_io_limits_enable(bs); 799 } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { 800 bdrv_io_limits_disable(bs); 801 } else { 802 if (bs->block_timer) { 803 qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); 804 } 805 } 806 807 return 0; 808 } 809 810 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 811 { 812 const char *id = qdict_get_str(qdict, "id"); 813 BlockDriverState *bs; 814 815 bs = bdrv_find(id); 816 if (!bs) { 817 qerror_report(QERR_DEVICE_NOT_FOUND, id); 818 return -1; 819 } 820 if (bdrv_in_use(bs)) { 821 qerror_report(QERR_DEVICE_IN_USE, id); 822 return -1; 823 } 824 825 /* quiesce block driver; prevent further io */ 826 bdrv_drain_all(); 827 bdrv_flush(bs); 828 bdrv_close(bs); 829 830 /* if we have a device attached to this BlockDriverState 831 * then we need to make the drive anonymous until the device 832 * can be removed. If this is a drive with no device backing 833 * then we can just get rid of the block driver state right here. 834 */ 835 if (bdrv_get_attached_dev(bs)) { 836 bdrv_make_anon(bs); 837 } else { 838 drive_uninit(drive_get_by_blockdev(bs)); 839 } 840 841 return 0; 842 } 843 844 /* 845 * XXX: replace the QERR_UNDEFINED_ERROR errors with real values once the 846 * existing QERR_ macro mess is cleaned up. A good example for better 847 * error reports can be found in the qemu-img resize code. 848 */ 849 void qmp_block_resize(const char *device, int64_t size, Error **errp) 850 { 851 BlockDriverState *bs; 852 853 bs = bdrv_find(device); 854 if (!bs) { 855 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 856 return; 857 } 858 859 if (size < 0) { 860 error_set(errp, QERR_UNDEFINED_ERROR); 861 return; 862 } 863 864 if (bdrv_truncate(bs, size)) { 865 error_set(errp, QERR_UNDEFINED_ERROR); 866 return; 867 } 868 } 869