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 "blockdev.h" 11 #include "hw/block-common.h" 12 #include "monitor.h" 13 #include "qerror.h" 14 #include "qemu-option.h" 15 #include "qemu-config.h" 16 #include "qemu-objects.h" 17 #include "sysemu.h" 18 #include "block_int.h" 19 #include "qmp-commands.h" 20 #include "trace.h" 21 #include "arch_init.h" 22 23 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 24 25 static const char *const if_name[IF_COUNT] = { 26 [IF_NONE] = "none", 27 [IF_IDE] = "ide", 28 [IF_SCSI] = "scsi", 29 [IF_FLOPPY] = "floppy", 30 [IF_PFLASH] = "pflash", 31 [IF_MTD] = "mtd", 32 [IF_SD] = "sd", 33 [IF_VIRTIO] = "virtio", 34 [IF_XEN] = "xen", 35 }; 36 37 static const int if_max_devs[IF_COUNT] = { 38 /* 39 * Do not change these numbers! They govern how drive option 40 * index maps to unit and bus. That mapping is ABI. 41 * 42 * All controllers used to imlement if=T drives need to support 43 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 44 * Otherwise, some index values map to "impossible" bus, unit 45 * values. 46 * 47 * For instance, if you change [IF_SCSI] to 255, -drive 48 * if=scsi,index=12 no longer means bus=1,unit=5, but 49 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 50 * the drive can't be set up. Regression. 51 */ 52 [IF_IDE] = 2, 53 [IF_SCSI] = 7, 54 }; 55 56 /* 57 * We automatically delete the drive when a device using it gets 58 * unplugged. Questionable feature, but we can't just drop it. 59 * Device models call blockdev_mark_auto_del() to schedule the 60 * automatic deletion, and generic qdev code calls blockdev_auto_del() 61 * when deletion is actually safe. 62 */ 63 void blockdev_mark_auto_del(BlockDriverState *bs) 64 { 65 DriveInfo *dinfo = drive_get_by_blockdev(bs); 66 67 if (bs->job) { 68 block_job_cancel(bs->job); 69 } 70 if (dinfo) { 71 dinfo->auto_del = 1; 72 } 73 } 74 75 void blockdev_auto_del(BlockDriverState *bs) 76 { 77 DriveInfo *dinfo = drive_get_by_blockdev(bs); 78 79 if (dinfo && dinfo->auto_del) { 80 drive_put_ref(dinfo); 81 } 82 } 83 84 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 85 { 86 int max_devs = if_max_devs[type]; 87 return max_devs ? index / max_devs : 0; 88 } 89 90 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 91 { 92 int max_devs = if_max_devs[type]; 93 return max_devs ? index % max_devs : index; 94 } 95 96 QemuOpts *drive_def(const char *optstr) 97 { 98 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 99 } 100 101 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 102 const char *optstr) 103 { 104 QemuOpts *opts; 105 char buf[32]; 106 107 opts = drive_def(optstr); 108 if (!opts) { 109 return NULL; 110 } 111 if (type != IF_DEFAULT) { 112 qemu_opt_set(opts, "if", if_name[type]); 113 } 114 if (index >= 0) { 115 snprintf(buf, sizeof(buf), "%d", index); 116 qemu_opt_set(opts, "index", buf); 117 } 118 if (file) 119 qemu_opt_set(opts, "file", file); 120 return opts; 121 } 122 123 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 124 { 125 DriveInfo *dinfo; 126 127 /* seek interface, bus and unit */ 128 129 QTAILQ_FOREACH(dinfo, &drives, next) { 130 if (dinfo->type == type && 131 dinfo->bus == bus && 132 dinfo->unit == unit) 133 return dinfo; 134 } 135 136 return NULL; 137 } 138 139 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 140 { 141 return drive_get(type, 142 drive_index_to_bus_id(type, index), 143 drive_index_to_unit_id(type, index)); 144 } 145 146 int drive_get_max_bus(BlockInterfaceType type) 147 { 148 int max_bus; 149 DriveInfo *dinfo; 150 151 max_bus = -1; 152 QTAILQ_FOREACH(dinfo, &drives, next) { 153 if(dinfo->type == type && 154 dinfo->bus > max_bus) 155 max_bus = dinfo->bus; 156 } 157 return max_bus; 158 } 159 160 /* Get a block device. This should only be used for single-drive devices 161 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 162 appropriate bus. */ 163 DriveInfo *drive_get_next(BlockInterfaceType type) 164 { 165 static int next_block_unit[IF_COUNT]; 166 167 return drive_get(type, 0, next_block_unit[type]++); 168 } 169 170 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 171 { 172 DriveInfo *dinfo; 173 174 QTAILQ_FOREACH(dinfo, &drives, next) { 175 if (dinfo->bdrv == bs) { 176 return dinfo; 177 } 178 } 179 return NULL; 180 } 181 182 static void bdrv_format_print(void *opaque, const char *name) 183 { 184 error_printf(" %s", name); 185 } 186 187 static void drive_uninit(DriveInfo *dinfo) 188 { 189 qemu_opts_del(dinfo->opts); 190 bdrv_delete(dinfo->bdrv); 191 g_free(dinfo->id); 192 QTAILQ_REMOVE(&drives, dinfo, next); 193 g_free(dinfo); 194 } 195 196 void drive_put_ref(DriveInfo *dinfo) 197 { 198 assert(dinfo->refcount); 199 if (--dinfo->refcount == 0) { 200 drive_uninit(dinfo); 201 } 202 } 203 204 void drive_get_ref(DriveInfo *dinfo) 205 { 206 dinfo->refcount++; 207 } 208 209 typedef struct { 210 QEMUBH *bh; 211 DriveInfo *dinfo; 212 } DrivePutRefBH; 213 214 static void drive_put_ref_bh(void *opaque) 215 { 216 DrivePutRefBH *s = opaque; 217 218 drive_put_ref(s->dinfo); 219 qemu_bh_delete(s->bh); 220 g_free(s); 221 } 222 223 /* 224 * Release a drive reference in a BH 225 * 226 * It is not possible to use drive_put_ref() from a callback function when the 227 * callers still need the drive. In such cases we schedule a BH to release the 228 * reference. 229 */ 230 static void drive_put_ref_bh_schedule(DriveInfo *dinfo) 231 { 232 DrivePutRefBH *s; 233 234 s = g_new(DrivePutRefBH, 1); 235 s->bh = qemu_bh_new(drive_put_ref_bh, s); 236 s->dinfo = dinfo; 237 qemu_bh_schedule(s->bh); 238 } 239 240 static int parse_block_error_action(const char *buf, int is_read) 241 { 242 if (!strcmp(buf, "ignore")) { 243 return BLOCK_ERR_IGNORE; 244 } else if (!is_read && !strcmp(buf, "enospc")) { 245 return BLOCK_ERR_STOP_ENOSPC; 246 } else if (!strcmp(buf, "stop")) { 247 return BLOCK_ERR_STOP_ANY; 248 } else if (!strcmp(buf, "report")) { 249 return BLOCK_ERR_REPORT; 250 } else { 251 error_report("'%s' invalid %s error action", 252 buf, is_read ? "read" : "write"); 253 return -1; 254 } 255 } 256 257 static bool do_check_io_limits(BlockIOLimit *io_limits) 258 { 259 bool bps_flag; 260 bool iops_flag; 261 262 assert(io_limits); 263 264 bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0) 265 && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0) 266 || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0)); 267 iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0) 268 && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0) 269 || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0)); 270 if (bps_flag || iops_flag) { 271 return false; 272 } 273 274 return true; 275 } 276 277 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) 278 { 279 const char *buf; 280 const char *file = NULL; 281 const char *serial; 282 const char *mediastr = ""; 283 BlockInterfaceType type; 284 enum { MEDIA_DISK, MEDIA_CDROM } media; 285 int bus_id, unit_id; 286 int cyls, heads, secs, translation; 287 BlockDriver *drv = NULL; 288 int max_devs; 289 int index; 290 int ro = 0; 291 int bdrv_flags = 0; 292 int on_read_error, on_write_error; 293 const char *devaddr; 294 DriveInfo *dinfo; 295 BlockIOLimit io_limits; 296 int snapshot = 0; 297 bool copy_on_read; 298 int ret; 299 300 translation = BIOS_ATA_TRANSLATION_AUTO; 301 media = MEDIA_DISK; 302 303 /* extract parameters */ 304 bus_id = qemu_opt_get_number(opts, "bus", 0); 305 unit_id = qemu_opt_get_number(opts, "unit", -1); 306 index = qemu_opt_get_number(opts, "index", -1); 307 308 cyls = qemu_opt_get_number(opts, "cyls", 0); 309 heads = qemu_opt_get_number(opts, "heads", 0); 310 secs = qemu_opt_get_number(opts, "secs", 0); 311 312 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 313 ro = qemu_opt_get_bool(opts, "readonly", 0); 314 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 315 316 file = qemu_opt_get(opts, "file"); 317 serial = qemu_opt_get(opts, "serial"); 318 319 if ((buf = qemu_opt_get(opts, "if")) != NULL) { 320 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) 321 ; 322 if (type == IF_COUNT) { 323 error_report("unsupported bus type '%s'", buf); 324 return NULL; 325 } 326 } else { 327 type = default_to_scsi ? IF_SCSI : IF_IDE; 328 } 329 330 max_devs = if_max_devs[type]; 331 332 if (cyls || heads || secs) { 333 if (cyls < 1) { 334 error_report("invalid physical cyls number"); 335 return NULL; 336 } 337 if (heads < 1) { 338 error_report("invalid physical heads number"); 339 return NULL; 340 } 341 if (secs < 1) { 342 error_report("invalid physical secs number"); 343 return NULL; 344 } 345 } 346 347 if ((buf = qemu_opt_get(opts, "trans")) != NULL) { 348 if (!cyls) { 349 error_report("'%s' trans must be used with cyls, heads and secs", 350 buf); 351 return NULL; 352 } 353 if (!strcmp(buf, "none")) 354 translation = BIOS_ATA_TRANSLATION_NONE; 355 else if (!strcmp(buf, "lba")) 356 translation = BIOS_ATA_TRANSLATION_LBA; 357 else if (!strcmp(buf, "auto")) 358 translation = BIOS_ATA_TRANSLATION_AUTO; 359 else { 360 error_report("'%s' invalid translation type", buf); 361 return NULL; 362 } 363 } 364 365 if ((buf = qemu_opt_get(opts, "media")) != NULL) { 366 if (!strcmp(buf, "disk")) { 367 media = MEDIA_DISK; 368 } else if (!strcmp(buf, "cdrom")) { 369 if (cyls || secs || heads) { 370 error_report("CHS can't be set with media=%s", buf); 371 return NULL; 372 } 373 media = MEDIA_CDROM; 374 } else { 375 error_report("'%s' invalid media", buf); 376 return NULL; 377 } 378 } 379 380 bdrv_flags |= BDRV_O_CACHE_WB; 381 if ((buf = qemu_opt_get(opts, "cache")) != NULL) { 382 if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) { 383 error_report("invalid cache option"); 384 return NULL; 385 } 386 } 387 388 #ifdef CONFIG_LINUX_AIO 389 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 390 if (!strcmp(buf, "native")) { 391 bdrv_flags |= BDRV_O_NATIVE_AIO; 392 } else if (!strcmp(buf, "threads")) { 393 /* this is the default */ 394 } else { 395 error_report("invalid aio option"); 396 return NULL; 397 } 398 } 399 #endif 400 401 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 402 if (is_help_option(buf)) { 403 error_printf("Supported formats:"); 404 bdrv_iterate_format(bdrv_format_print, NULL); 405 error_printf("\n"); 406 return NULL; 407 } 408 drv = bdrv_find_whitelisted_format(buf); 409 if (!drv) { 410 error_report("'%s' invalid format", buf); 411 return NULL; 412 } 413 } 414 415 /* disk I/O throttling */ 416 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = 417 qemu_opt_get_number(opts, "bps", 0); 418 io_limits.bps[BLOCK_IO_LIMIT_READ] = 419 qemu_opt_get_number(opts, "bps_rd", 0); 420 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = 421 qemu_opt_get_number(opts, "bps_wr", 0); 422 io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = 423 qemu_opt_get_number(opts, "iops", 0); 424 io_limits.iops[BLOCK_IO_LIMIT_READ] = 425 qemu_opt_get_number(opts, "iops_rd", 0); 426 io_limits.iops[BLOCK_IO_LIMIT_WRITE] = 427 qemu_opt_get_number(opts, "iops_wr", 0); 428 429 if (!do_check_io_limits(&io_limits)) { 430 error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) " 431 "cannot be used at the same time"); 432 return NULL; 433 } 434 435 on_write_error = BLOCK_ERR_STOP_ENOSPC; 436 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 437 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 438 error_report("werror is not supported by this bus type"); 439 return NULL; 440 } 441 442 on_write_error = parse_block_error_action(buf, 0); 443 if (on_write_error < 0) { 444 return NULL; 445 } 446 } 447 448 on_read_error = BLOCK_ERR_REPORT; 449 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 450 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 451 error_report("rerror is not supported by this bus type"); 452 return NULL; 453 } 454 455 on_read_error = parse_block_error_action(buf, 1); 456 if (on_read_error < 0) { 457 return NULL; 458 } 459 } 460 461 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { 462 if (type != IF_VIRTIO) { 463 error_report("addr is not supported by this bus type"); 464 return NULL; 465 } 466 } 467 468 /* compute bus and unit according index */ 469 470 if (index != -1) { 471 if (bus_id != 0 || unit_id != -1) { 472 error_report("index cannot be used with bus and unit"); 473 return NULL; 474 } 475 bus_id = drive_index_to_bus_id(type, index); 476 unit_id = drive_index_to_unit_id(type, index); 477 } 478 479 /* if user doesn't specify a unit_id, 480 * try to find the first free 481 */ 482 483 if (unit_id == -1) { 484 unit_id = 0; 485 while (drive_get(type, bus_id, unit_id) != NULL) { 486 unit_id++; 487 if (max_devs && unit_id >= max_devs) { 488 unit_id -= max_devs; 489 bus_id++; 490 } 491 } 492 } 493 494 /* check unit id */ 495 496 if (max_devs && unit_id >= max_devs) { 497 error_report("unit %d too big (max is %d)", 498 unit_id, max_devs - 1); 499 return NULL; 500 } 501 502 /* 503 * catch multiple definitions 504 */ 505 506 if (drive_get(type, bus_id, unit_id) != NULL) { 507 error_report("drive with bus=%d, unit=%d (index=%d) exists", 508 bus_id, unit_id, index); 509 return NULL; 510 } 511 512 /* init */ 513 514 dinfo = g_malloc0(sizeof(*dinfo)); 515 if ((buf = qemu_opts_id(opts)) != NULL) { 516 dinfo->id = g_strdup(buf); 517 } else { 518 /* no id supplied -> create one */ 519 dinfo->id = g_malloc0(32); 520 if (type == IF_IDE || type == IF_SCSI) 521 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 522 if (max_devs) 523 snprintf(dinfo->id, 32, "%s%i%s%i", 524 if_name[type], bus_id, mediastr, unit_id); 525 else 526 snprintf(dinfo->id, 32, "%s%s%i", 527 if_name[type], mediastr, unit_id); 528 } 529 dinfo->bdrv = bdrv_new(dinfo->id); 530 dinfo->devaddr = devaddr; 531 dinfo->type = type; 532 dinfo->bus = bus_id; 533 dinfo->unit = unit_id; 534 dinfo->cyls = cyls; 535 dinfo->heads = heads; 536 dinfo->secs = secs; 537 dinfo->trans = translation; 538 dinfo->opts = opts; 539 dinfo->refcount = 1; 540 dinfo->serial = serial; 541 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 542 543 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 544 545 /* disk I/O throttling */ 546 bdrv_set_io_limits(dinfo->bdrv, &io_limits); 547 548 switch(type) { 549 case IF_IDE: 550 case IF_SCSI: 551 case IF_XEN: 552 case IF_NONE: 553 dinfo->media_cd = media == MEDIA_CDROM; 554 break; 555 case IF_SD: 556 case IF_FLOPPY: 557 case IF_PFLASH: 558 case IF_MTD: 559 break; 560 case IF_VIRTIO: 561 /* add virtio block device */ 562 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, NULL); 563 if (arch_type == QEMU_ARCH_S390X) { 564 qemu_opt_set(opts, "driver", "virtio-blk-s390"); 565 } else { 566 qemu_opt_set(opts, "driver", "virtio-blk-pci"); 567 } 568 qemu_opt_set(opts, "drive", dinfo->id); 569 if (devaddr) 570 qemu_opt_set(opts, "addr", devaddr); 571 break; 572 default: 573 abort(); 574 } 575 if (!file || !*file) { 576 return dinfo; 577 } 578 if (snapshot) { 579 /* always use cache=unsafe with snapshot */ 580 bdrv_flags &= ~BDRV_O_CACHE_MASK; 581 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 582 } 583 584 if (copy_on_read) { 585 bdrv_flags |= BDRV_O_COPY_ON_READ; 586 } 587 588 if (runstate_check(RUN_STATE_INMIGRATE)) { 589 bdrv_flags |= BDRV_O_INCOMING; 590 } 591 592 if (media == MEDIA_CDROM) { 593 /* CDROM is fine for any interface, don't check. */ 594 ro = 1; 595 } else if (ro == 1) { 596 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && 597 type != IF_NONE && type != IF_PFLASH) { 598 error_report("readonly not supported by this bus type"); 599 goto err; 600 } 601 } 602 603 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 604 605 if (ro && copy_on_read) { 606 error_report("warning: disabling copy_on_read on readonly drive"); 607 } 608 609 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); 610 if (ret < 0) { 611 error_report("could not open disk image %s: %s", 612 file, strerror(-ret)); 613 goto err; 614 } 615 616 if (bdrv_key_required(dinfo->bdrv)) 617 autostart = 0; 618 return dinfo; 619 620 err: 621 bdrv_delete(dinfo->bdrv); 622 g_free(dinfo->id); 623 QTAILQ_REMOVE(&drives, dinfo, next); 624 g_free(dinfo); 625 return NULL; 626 } 627 628 void do_commit(Monitor *mon, const QDict *qdict) 629 { 630 const char *device = qdict_get_str(qdict, "device"); 631 BlockDriverState *bs; 632 int ret; 633 634 if (!strcmp(device, "all")) { 635 ret = bdrv_commit_all(); 636 if (ret == -EBUSY) { 637 qerror_report(QERR_DEVICE_IN_USE, device); 638 return; 639 } 640 } else { 641 bs = bdrv_find(device); 642 if (!bs) { 643 qerror_report(QERR_DEVICE_NOT_FOUND, device); 644 return; 645 } 646 ret = bdrv_commit(bs); 647 if (ret == -EBUSY) { 648 qerror_report(QERR_DEVICE_IN_USE, device); 649 return; 650 } 651 } 652 } 653 654 static void blockdev_do_action(int kind, void *data, Error **errp) 655 { 656 BlockdevAction action; 657 BlockdevActionList list; 658 659 action.kind = kind; 660 action.data = data; 661 list.value = &action; 662 list.next = NULL; 663 qmp_transaction(&list, errp); 664 } 665 666 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, 667 bool has_format, const char *format, 668 bool has_mode, enum NewImageMode mode, 669 Error **errp) 670 { 671 BlockdevSnapshot snapshot = { 672 .device = (char *) device, 673 .snapshot_file = (char *) snapshot_file, 674 .has_format = has_format, 675 .format = (char *) format, 676 .has_mode = has_mode, 677 .mode = mode, 678 }; 679 blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot, 680 errp); 681 } 682 683 684 /* New and old BlockDriverState structs for group snapshots */ 685 typedef struct BlkTransactionStates { 686 BlockDriverState *old_bs; 687 BlockDriverState *new_bs; 688 QSIMPLEQ_ENTRY(BlkTransactionStates) entry; 689 } BlkTransactionStates; 690 691 /* 692 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 693 * then we do not pivot any of the devices in the group, and abandon the 694 * snapshots 695 */ 696 void qmp_transaction(BlockdevActionList *dev_list, Error **errp) 697 { 698 int ret = 0; 699 BlockdevActionList *dev_entry = dev_list; 700 BlkTransactionStates *states, *next; 701 702 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states; 703 QSIMPLEQ_INIT(&snap_bdrv_states); 704 705 /* drain all i/o before any snapshots */ 706 bdrv_drain_all(); 707 708 /* We don't do anything in this loop that commits us to the snapshot */ 709 while (NULL != dev_entry) { 710 BlockdevAction *dev_info = NULL; 711 BlockDriver *proto_drv; 712 BlockDriver *drv; 713 int flags; 714 enum NewImageMode mode; 715 const char *new_image_file; 716 const char *device; 717 const char *format = "qcow2"; 718 719 dev_info = dev_entry->value; 720 dev_entry = dev_entry->next; 721 722 states = g_malloc0(sizeof(BlkTransactionStates)); 723 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry); 724 725 switch (dev_info->kind) { 726 case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 727 device = dev_info->blockdev_snapshot_sync->device; 728 if (!dev_info->blockdev_snapshot_sync->has_mode) { 729 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 730 } 731 new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file; 732 if (dev_info->blockdev_snapshot_sync->has_format) { 733 format = dev_info->blockdev_snapshot_sync->format; 734 } 735 mode = dev_info->blockdev_snapshot_sync->mode; 736 break; 737 default: 738 abort(); 739 } 740 741 drv = bdrv_find_format(format); 742 if (!drv) { 743 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 744 goto delete_and_fail; 745 } 746 747 states->old_bs = bdrv_find(device); 748 if (!states->old_bs) { 749 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 750 goto delete_and_fail; 751 } 752 753 if (!bdrv_is_inserted(states->old_bs)) { 754 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 755 goto delete_and_fail; 756 } 757 758 if (bdrv_in_use(states->old_bs)) { 759 error_set(errp, QERR_DEVICE_IN_USE, device); 760 goto delete_and_fail; 761 } 762 763 if (!bdrv_is_read_only(states->old_bs)) { 764 if (bdrv_flush(states->old_bs)) { 765 error_set(errp, QERR_IO_ERROR); 766 goto delete_and_fail; 767 } 768 } 769 770 flags = states->old_bs->open_flags; 771 772 proto_drv = bdrv_find_protocol(new_image_file); 773 if (!proto_drv) { 774 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 775 goto delete_and_fail; 776 } 777 778 /* create new image w/backing file */ 779 if (mode != NEW_IMAGE_MODE_EXISTING) { 780 ret = bdrv_img_create(new_image_file, format, 781 states->old_bs->filename, 782 states->old_bs->drv->format_name, 783 NULL, -1, flags); 784 if (ret) { 785 error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); 786 goto delete_and_fail; 787 } 788 } 789 790 /* We will manually add the backing_hd field to the bs later */ 791 states->new_bs = bdrv_new(""); 792 ret = bdrv_open(states->new_bs, new_image_file, 793 flags | BDRV_O_NO_BACKING, drv); 794 if (ret != 0) { 795 error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); 796 goto delete_and_fail; 797 } 798 } 799 800 801 /* Now we are going to do the actual pivot. Everything up to this point 802 * is reversible, but we are committed at this point */ 803 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { 804 /* This removes our old bs from the bdrv_states, and adds the new bs */ 805 bdrv_append(states->new_bs, states->old_bs); 806 } 807 808 /* success */ 809 goto exit; 810 811 delete_and_fail: 812 /* 813 * failure, and it is all-or-none; abandon each new bs, and keep using 814 * the original bs for all images 815 */ 816 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { 817 if (states->new_bs) { 818 bdrv_delete(states->new_bs); 819 } 820 } 821 exit: 822 QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) { 823 g_free(states); 824 } 825 return; 826 } 827 828 829 static void eject_device(BlockDriverState *bs, int force, Error **errp) 830 { 831 if (bdrv_in_use(bs)) { 832 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 833 return; 834 } 835 if (!bdrv_dev_has_removable_media(bs)) { 836 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 837 return; 838 } 839 840 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 841 bdrv_dev_eject_request(bs, force); 842 if (!force) { 843 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 844 return; 845 } 846 } 847 848 bdrv_close(bs); 849 } 850 851 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 852 { 853 BlockDriverState *bs; 854 855 bs = bdrv_find(device); 856 if (!bs) { 857 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 858 return; 859 } 860 861 eject_device(bs, force, errp); 862 } 863 864 void qmp_block_passwd(const char *device, const char *password, Error **errp) 865 { 866 BlockDriverState *bs; 867 int err; 868 869 bs = bdrv_find(device); 870 if (!bs) { 871 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 872 return; 873 } 874 875 err = bdrv_set_key(bs, password); 876 if (err == -EINVAL) { 877 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 878 return; 879 } else if (err < 0) { 880 error_set(errp, QERR_INVALID_PASSWORD); 881 return; 882 } 883 } 884 885 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 886 int bdrv_flags, BlockDriver *drv, 887 const char *password, Error **errp) 888 { 889 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { 890 error_set(errp, QERR_OPEN_FILE_FAILED, filename); 891 return; 892 } 893 894 if (bdrv_key_required(bs)) { 895 if (password) { 896 if (bdrv_set_key(bs, password) < 0) { 897 error_set(errp, QERR_INVALID_PASSWORD); 898 } 899 } else { 900 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 901 bdrv_get_encrypted_filename(bs)); 902 } 903 } else if (password) { 904 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 905 } 906 } 907 908 void qmp_change_blockdev(const char *device, const char *filename, 909 bool has_format, const char *format, Error **errp) 910 { 911 BlockDriverState *bs; 912 BlockDriver *drv = NULL; 913 int bdrv_flags; 914 Error *err = NULL; 915 916 bs = bdrv_find(device); 917 if (!bs) { 918 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 919 return; 920 } 921 922 if (format) { 923 drv = bdrv_find_whitelisted_format(format); 924 if (!drv) { 925 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 926 return; 927 } 928 } 929 930 eject_device(bs, 0, &err); 931 if (error_is_set(&err)) { 932 error_propagate(errp, err); 933 return; 934 } 935 936 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 937 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 938 939 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 940 } 941 942 /* throttling disk I/O limits */ 943 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 944 int64_t bps_wr, int64_t iops, int64_t iops_rd, 945 int64_t iops_wr, Error **errp) 946 { 947 BlockIOLimit io_limits; 948 BlockDriverState *bs; 949 950 bs = bdrv_find(device); 951 if (!bs) { 952 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 953 return; 954 } 955 956 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; 957 io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; 958 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; 959 io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; 960 io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; 961 io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; 962 963 if (!do_check_io_limits(&io_limits)) { 964 error_set(errp, QERR_INVALID_PARAMETER_COMBINATION); 965 return; 966 } 967 968 bs->io_limits = io_limits; 969 bs->slice_time = BLOCK_IO_SLICE_TIME; 970 971 if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) { 972 bdrv_io_limits_enable(bs); 973 } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { 974 bdrv_io_limits_disable(bs); 975 } else { 976 if (bs->block_timer) { 977 qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); 978 } 979 } 980 } 981 982 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 983 { 984 const char *id = qdict_get_str(qdict, "id"); 985 BlockDriverState *bs; 986 987 bs = bdrv_find(id); 988 if (!bs) { 989 qerror_report(QERR_DEVICE_NOT_FOUND, id); 990 return -1; 991 } 992 if (bdrv_in_use(bs)) { 993 qerror_report(QERR_DEVICE_IN_USE, id); 994 return -1; 995 } 996 997 /* quiesce block driver; prevent further io */ 998 bdrv_drain_all(); 999 bdrv_flush(bs); 1000 bdrv_close(bs); 1001 1002 /* if we have a device attached to this BlockDriverState 1003 * then we need to make the drive anonymous until the device 1004 * can be removed. If this is a drive with no device backing 1005 * then we can just get rid of the block driver state right here. 1006 */ 1007 if (bdrv_get_attached_dev(bs)) { 1008 bdrv_make_anon(bs); 1009 } else { 1010 drive_uninit(drive_get_by_blockdev(bs)); 1011 } 1012 1013 return 0; 1014 } 1015 1016 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1017 { 1018 BlockDriverState *bs; 1019 1020 bs = bdrv_find(device); 1021 if (!bs) { 1022 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1023 return; 1024 } 1025 1026 if (size < 0) { 1027 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1028 return; 1029 } 1030 1031 switch (bdrv_truncate(bs, size)) { 1032 case 0: 1033 break; 1034 case -ENOMEDIUM: 1035 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1036 break; 1037 case -ENOTSUP: 1038 error_set(errp, QERR_UNSUPPORTED); 1039 break; 1040 case -EACCES: 1041 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1042 break; 1043 case -EBUSY: 1044 error_set(errp, QERR_DEVICE_IN_USE, device); 1045 break; 1046 default: 1047 error_set(errp, QERR_UNDEFINED_ERROR); 1048 break; 1049 } 1050 } 1051 1052 static QObject *qobject_from_block_job(BlockJob *job) 1053 { 1054 return qobject_from_jsonf("{ 'type': %s," 1055 "'device': %s," 1056 "'len': %" PRId64 "," 1057 "'offset': %" PRId64 "," 1058 "'speed': %" PRId64 " }", 1059 job->job_type->job_type, 1060 bdrv_get_device_name(job->bs), 1061 job->len, 1062 job->offset, 1063 job->speed); 1064 } 1065 1066 static void block_stream_cb(void *opaque, int ret) 1067 { 1068 BlockDriverState *bs = opaque; 1069 QObject *obj; 1070 1071 trace_block_stream_cb(bs, bs->job, ret); 1072 1073 assert(bs->job); 1074 obj = qobject_from_block_job(bs->job); 1075 if (ret < 0) { 1076 QDict *dict = qobject_to_qdict(obj); 1077 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1078 } 1079 1080 if (block_job_is_cancelled(bs->job)) { 1081 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1082 } else { 1083 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1084 } 1085 qobject_decref(obj); 1086 1087 drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); 1088 } 1089 1090 void qmp_block_stream(const char *device, bool has_base, 1091 const char *base, bool has_speed, 1092 int64_t speed, Error **errp) 1093 { 1094 BlockDriverState *bs; 1095 BlockDriverState *base_bs = NULL; 1096 Error *local_err = NULL; 1097 1098 bs = bdrv_find(device); 1099 if (!bs) { 1100 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1101 return; 1102 } 1103 1104 if (base) { 1105 base_bs = bdrv_find_backing_image(bs, base); 1106 if (base_bs == NULL) { 1107 error_set(errp, QERR_BASE_NOT_FOUND, base); 1108 return; 1109 } 1110 } 1111 1112 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1113 block_stream_cb, bs, &local_err); 1114 if (error_is_set(&local_err)) { 1115 error_propagate(errp, local_err); 1116 return; 1117 } 1118 1119 /* Grab a reference so hotplug does not delete the BlockDriverState from 1120 * underneath us. 1121 */ 1122 drive_get_ref(drive_get_by_blockdev(bs)); 1123 1124 trace_qmp_block_stream(bs, bs->job); 1125 } 1126 1127 static BlockJob *find_block_job(const char *device) 1128 { 1129 BlockDriverState *bs; 1130 1131 bs = bdrv_find(device); 1132 if (!bs || !bs->job) { 1133 return NULL; 1134 } 1135 return bs->job; 1136 } 1137 1138 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 1139 { 1140 BlockJob *job = find_block_job(device); 1141 1142 if (!job) { 1143 error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); 1144 return; 1145 } 1146 1147 block_job_set_speed(job, speed, errp); 1148 } 1149 1150 void qmp_block_job_cancel(const char *device, Error **errp) 1151 { 1152 BlockJob *job = find_block_job(device); 1153 1154 if (!job) { 1155 error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); 1156 return; 1157 } 1158 1159 trace_qmp_block_job_cancel(job); 1160 block_job_cancel(job); 1161 } 1162 1163 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 1164 { 1165 BlockJobInfoList **prev = opaque; 1166 BlockJob *job = bs->job; 1167 1168 if (job) { 1169 BlockJobInfoList *elem; 1170 BlockJobInfo *info = g_new(BlockJobInfo, 1); 1171 *info = (BlockJobInfo){ 1172 .type = g_strdup(job->job_type->job_type), 1173 .device = g_strdup(bdrv_get_device_name(bs)), 1174 .len = job->len, 1175 .offset = job->offset, 1176 .speed = job->speed, 1177 }; 1178 1179 elem = g_new0(BlockJobInfoList, 1); 1180 elem->value = info; 1181 1182 (*prev)->next = elem; 1183 *prev = elem; 1184 } 1185 } 1186 1187 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 1188 { 1189 /* Dummy is a fake list element for holding the head pointer */ 1190 BlockJobInfoList dummy = {}; 1191 BlockJobInfoList *prev = &dummy; 1192 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 1193 return dummy.next; 1194 } 1195