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 "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 (dinfo) { 68 dinfo->auto_del = 1; 69 } 70 } 71 72 void blockdev_auto_del(BlockDriverState *bs) 73 { 74 DriveInfo *dinfo = drive_get_by_blockdev(bs); 75 76 if (dinfo && dinfo->auto_del) { 77 drive_put_ref(dinfo); 78 } 79 } 80 81 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 82 { 83 int max_devs = if_max_devs[type]; 84 return max_devs ? index / max_devs : 0; 85 } 86 87 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 88 { 89 int max_devs = if_max_devs[type]; 90 return max_devs ? index % max_devs : index; 91 } 92 93 QemuOpts *drive_def(const char *optstr) 94 { 95 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 96 } 97 98 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 99 const char *optstr) 100 { 101 QemuOpts *opts; 102 char buf[32]; 103 104 opts = drive_def(optstr); 105 if (!opts) { 106 return NULL; 107 } 108 if (type != IF_DEFAULT) { 109 qemu_opt_set(opts, "if", if_name[type]); 110 } 111 if (index >= 0) { 112 snprintf(buf, sizeof(buf), "%d", index); 113 qemu_opt_set(opts, "index", buf); 114 } 115 if (file) 116 qemu_opt_set(opts, "file", file); 117 return opts; 118 } 119 120 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 121 { 122 DriveInfo *dinfo; 123 124 /* seek interface, bus and unit */ 125 126 QTAILQ_FOREACH(dinfo, &drives, next) { 127 if (dinfo->type == type && 128 dinfo->bus == bus && 129 dinfo->unit == unit) 130 return dinfo; 131 } 132 133 return NULL; 134 } 135 136 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 137 { 138 return drive_get(type, 139 drive_index_to_bus_id(type, index), 140 drive_index_to_unit_id(type, index)); 141 } 142 143 int drive_get_max_bus(BlockInterfaceType type) 144 { 145 int max_bus; 146 DriveInfo *dinfo; 147 148 max_bus = -1; 149 QTAILQ_FOREACH(dinfo, &drives, next) { 150 if(dinfo->type == type && 151 dinfo->bus > max_bus) 152 max_bus = dinfo->bus; 153 } 154 return max_bus; 155 } 156 157 /* Get a block device. This should only be used for single-drive devices 158 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 159 appropriate bus. */ 160 DriveInfo *drive_get_next(BlockInterfaceType type) 161 { 162 static int next_block_unit[IF_COUNT]; 163 164 return drive_get(type, 0, next_block_unit[type]++); 165 } 166 167 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 168 { 169 DriveInfo *dinfo; 170 171 QTAILQ_FOREACH(dinfo, &drives, next) { 172 if (dinfo->bdrv == bs) { 173 return dinfo; 174 } 175 } 176 return NULL; 177 } 178 179 static void bdrv_format_print(void *opaque, const char *name) 180 { 181 error_printf(" %s", name); 182 } 183 184 static void drive_uninit(DriveInfo *dinfo) 185 { 186 qemu_opts_del(dinfo->opts); 187 bdrv_delete(dinfo->bdrv); 188 g_free(dinfo->id); 189 QTAILQ_REMOVE(&drives, dinfo, next); 190 g_free(dinfo); 191 } 192 193 void drive_put_ref(DriveInfo *dinfo) 194 { 195 assert(dinfo->refcount); 196 if (--dinfo->refcount == 0) { 197 drive_uninit(dinfo); 198 } 199 } 200 201 void drive_get_ref(DriveInfo *dinfo) 202 { 203 dinfo->refcount++; 204 } 205 206 typedef struct { 207 QEMUBH *bh; 208 DriveInfo *dinfo; 209 } DrivePutRefBH; 210 211 static void drive_put_ref_bh(void *opaque) 212 { 213 DrivePutRefBH *s = opaque; 214 215 drive_put_ref(s->dinfo); 216 qemu_bh_delete(s->bh); 217 g_free(s); 218 } 219 220 /* 221 * Release a drive reference in a BH 222 * 223 * It is not possible to use drive_put_ref() from a callback function when the 224 * callers still need the drive. In such cases we schedule a BH to release the 225 * reference. 226 */ 227 static void drive_put_ref_bh_schedule(DriveInfo *dinfo) 228 { 229 DrivePutRefBH *s; 230 231 s = g_new(DrivePutRefBH, 1); 232 s->bh = qemu_bh_new(drive_put_ref_bh, s); 233 s->dinfo = dinfo; 234 qemu_bh_schedule(s->bh); 235 } 236 237 static int parse_block_error_action(const char *buf, int is_read) 238 { 239 if (!strcmp(buf, "ignore")) { 240 return BLOCK_ERR_IGNORE; 241 } else if (!is_read && !strcmp(buf, "enospc")) { 242 return BLOCK_ERR_STOP_ENOSPC; 243 } else if (!strcmp(buf, "stop")) { 244 return BLOCK_ERR_STOP_ANY; 245 } else if (!strcmp(buf, "report")) { 246 return BLOCK_ERR_REPORT; 247 } else { 248 error_report("'%s' invalid %s error action", 249 buf, is_read ? "read" : "write"); 250 return -1; 251 } 252 } 253 254 static bool do_check_io_limits(BlockIOLimit *io_limits) 255 { 256 bool bps_flag; 257 bool iops_flag; 258 259 assert(io_limits); 260 261 bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0) 262 && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0) 263 || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0)); 264 iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0) 265 && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0) 266 || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0)); 267 if (bps_flag || iops_flag) { 268 return false; 269 } 270 271 return true; 272 } 273 274 DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi) 275 { 276 const char *buf; 277 const char *file = NULL; 278 char devname[128]; 279 const char *serial; 280 const char *mediastr = ""; 281 BlockInterfaceType type; 282 enum { MEDIA_DISK, MEDIA_CDROM } media; 283 int bus_id, unit_id; 284 int cyls, heads, secs, translation; 285 BlockDriver *drv = NULL; 286 int max_devs; 287 int index; 288 int ro = 0; 289 int bdrv_flags = 0; 290 int on_read_error, on_write_error; 291 const char *devaddr; 292 DriveInfo *dinfo; 293 BlockIOLimit io_limits; 294 int snapshot = 0; 295 bool copy_on_read; 296 int ret; 297 298 translation = BIOS_ATA_TRANSLATION_AUTO; 299 media = MEDIA_DISK; 300 301 /* extract parameters */ 302 bus_id = qemu_opt_get_number(opts, "bus", 0); 303 unit_id = qemu_opt_get_number(opts, "unit", -1); 304 index = qemu_opt_get_number(opts, "index", -1); 305 306 cyls = qemu_opt_get_number(opts, "cyls", 0); 307 heads = qemu_opt_get_number(opts, "heads", 0); 308 secs = qemu_opt_get_number(opts, "secs", 0); 309 310 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 311 ro = qemu_opt_get_bool(opts, "readonly", 0); 312 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 313 314 file = qemu_opt_get(opts, "file"); 315 serial = qemu_opt_get(opts, "serial"); 316 317 if ((buf = qemu_opt_get(opts, "if")) != NULL) { 318 pstrcpy(devname, sizeof(devname), buf); 319 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) 320 ; 321 if (type == IF_COUNT) { 322 error_report("unsupported bus type '%s'", buf); 323 return NULL; 324 } 325 } else { 326 type = default_to_scsi ? IF_SCSI : IF_IDE; 327 pstrcpy(devname, sizeof(devname), if_name[type]); 328 } 329 330 max_devs = if_max_devs[type]; 331 332 if (cyls || heads || secs) { 333 if (cyls < 1 || (type == IF_IDE && cyls > 16383)) { 334 error_report("invalid physical cyls number"); 335 return NULL; 336 } 337 if (heads < 1 || (type == IF_IDE && heads > 16)) { 338 error_report("invalid physical heads number"); 339 return NULL; 340 } 341 if (secs < 1 || (type == IF_IDE && secs > 63)) { 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 if ((buf = qemu_opt_get(opts, "cache")) != NULL) { 381 if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) { 382 error_report("invalid cache option"); 383 return NULL; 384 } 385 } 386 387 #ifdef CONFIG_LINUX_AIO 388 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 389 if (!strcmp(buf, "native")) { 390 bdrv_flags |= BDRV_O_NATIVE_AIO; 391 } else if (!strcmp(buf, "threads")) { 392 /* this is the default */ 393 } else { 394 error_report("invalid aio option"); 395 return NULL; 396 } 397 } 398 #endif 399 400 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 401 if (strcmp(buf, "?") == 0) { 402 error_printf("Supported formats:"); 403 bdrv_iterate_format(bdrv_format_print, NULL); 404 error_printf("\n"); 405 return NULL; 406 } 407 drv = bdrv_find_whitelisted_format(buf); 408 if (!drv) { 409 error_report("'%s' invalid format", buf); 410 return NULL; 411 } 412 } 413 414 /* disk I/O throttling */ 415 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = 416 qemu_opt_get_number(opts, "bps", 0); 417 io_limits.bps[BLOCK_IO_LIMIT_READ] = 418 qemu_opt_get_number(opts, "bps_rd", 0); 419 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = 420 qemu_opt_get_number(opts, "bps_wr", 0); 421 io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = 422 qemu_opt_get_number(opts, "iops", 0); 423 io_limits.iops[BLOCK_IO_LIMIT_READ] = 424 qemu_opt_get_number(opts, "iops_rd", 0); 425 io_limits.iops[BLOCK_IO_LIMIT_WRITE] = 426 qemu_opt_get_number(opts, "iops_wr", 0); 427 428 if (!do_check_io_limits(&io_limits)) { 429 error_report("bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) " 430 "cannot be used at the same time"); 431 return NULL; 432 } 433 434 on_write_error = BLOCK_ERR_STOP_ENOSPC; 435 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 436 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 437 error_report("werror is not supported by this bus type"); 438 return NULL; 439 } 440 441 on_write_error = parse_block_error_action(buf, 0); 442 if (on_write_error < 0) { 443 return NULL; 444 } 445 } 446 447 on_read_error = BLOCK_ERR_REPORT; 448 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 449 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 450 error_report("rerror is not supported by this bus type"); 451 return NULL; 452 } 453 454 on_read_error = parse_block_error_action(buf, 1); 455 if (on_read_error < 0) { 456 return NULL; 457 } 458 } 459 460 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { 461 if (type != IF_VIRTIO) { 462 error_report("addr is not supported by this bus type"); 463 return NULL; 464 } 465 } 466 467 /* compute bus and unit according index */ 468 469 if (index != -1) { 470 if (bus_id != 0 || unit_id != -1) { 471 error_report("index cannot be used with bus and unit"); 472 return NULL; 473 } 474 bus_id = drive_index_to_bus_id(type, index); 475 unit_id = drive_index_to_unit_id(type, index); 476 } 477 478 /* if user doesn't specify a unit_id, 479 * try to find the first free 480 */ 481 482 if (unit_id == -1) { 483 unit_id = 0; 484 while (drive_get(type, bus_id, unit_id) != NULL) { 485 unit_id++; 486 if (max_devs && unit_id >= max_devs) { 487 unit_id -= max_devs; 488 bus_id++; 489 } 490 } 491 } 492 493 /* check unit id */ 494 495 if (max_devs && unit_id >= max_devs) { 496 error_report("unit %d too big (max is %d)", 497 unit_id, max_devs - 1); 498 return NULL; 499 } 500 501 /* 502 * catch multiple definitions 503 */ 504 505 if (drive_get(type, bus_id, unit_id) != NULL) { 506 error_report("drive with bus=%d, unit=%d (index=%d) exists", 507 bus_id, unit_id, index); 508 return NULL; 509 } 510 511 /* init */ 512 513 dinfo = g_malloc0(sizeof(*dinfo)); 514 if ((buf = qemu_opts_id(opts)) != NULL) { 515 dinfo->id = g_strdup(buf); 516 } else { 517 /* no id supplied -> create one */ 518 dinfo->id = g_malloc0(32); 519 if (type == IF_IDE || type == IF_SCSI) 520 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 521 if (max_devs) 522 snprintf(dinfo->id, 32, "%s%i%s%i", 523 devname, bus_id, mediastr, unit_id); 524 else 525 snprintf(dinfo->id, 32, "%s%s%i", 526 devname, mediastr, unit_id); 527 } 528 dinfo->bdrv = bdrv_new(dinfo->id); 529 dinfo->devaddr = devaddr; 530 dinfo->type = type; 531 dinfo->bus = bus_id; 532 dinfo->unit = unit_id; 533 dinfo->opts = opts; 534 dinfo->refcount = 1; 535 if (serial) 536 strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1); 537 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 538 539 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 540 541 /* disk I/O throttling */ 542 bdrv_set_io_limits(dinfo->bdrv, &io_limits); 543 544 switch(type) { 545 case IF_IDE: 546 case IF_SCSI: 547 case IF_XEN: 548 case IF_NONE: 549 switch(media) { 550 case MEDIA_DISK: 551 if (cyls != 0) { 552 bdrv_set_geometry_hint(dinfo->bdrv, cyls, heads, secs); 553 bdrv_set_translation_hint(dinfo->bdrv, translation); 554 } 555 break; 556 case MEDIA_CDROM: 557 dinfo->media_cd = 1; 558 break; 559 } 560 break; 561 case IF_SD: 562 case IF_FLOPPY: 563 case IF_PFLASH: 564 case IF_MTD: 565 break; 566 case IF_VIRTIO: 567 /* add virtio block device */ 568 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0); 569 if (arch_type == QEMU_ARCH_S390X) { 570 qemu_opt_set(opts, "driver", "virtio-blk-s390"); 571 } else { 572 qemu_opt_set(opts, "driver", "virtio-blk-pci"); 573 } 574 qemu_opt_set(opts, "drive", dinfo->id); 575 if (devaddr) 576 qemu_opt_set(opts, "addr", devaddr); 577 break; 578 default: 579 abort(); 580 } 581 if (!file || !*file) { 582 return dinfo; 583 } 584 if (snapshot) { 585 /* always use cache=unsafe with snapshot */ 586 bdrv_flags &= ~BDRV_O_CACHE_MASK; 587 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 588 } 589 590 if (copy_on_read) { 591 bdrv_flags |= BDRV_O_COPY_ON_READ; 592 } 593 594 if (media == MEDIA_CDROM) { 595 /* CDROM is fine for any interface, don't check. */ 596 ro = 1; 597 } else if (ro == 1) { 598 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && 599 type != IF_NONE && type != IF_PFLASH) { 600 error_report("readonly not supported by this bus type"); 601 goto err; 602 } 603 } 604 605 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 606 607 ret = bdrv_open(dinfo->bdrv, file, bdrv_flags, drv); 608 if (ret < 0) { 609 error_report("could not open disk image %s: %s", 610 file, strerror(-ret)); 611 goto err; 612 } 613 614 if (bdrv_key_required(dinfo->bdrv)) 615 autostart = 0; 616 return dinfo; 617 618 err: 619 bdrv_delete(dinfo->bdrv); 620 g_free(dinfo->id); 621 QTAILQ_REMOVE(&drives, dinfo, next); 622 g_free(dinfo); 623 return NULL; 624 } 625 626 void do_commit(Monitor *mon, const QDict *qdict) 627 { 628 const char *device = qdict_get_str(qdict, "device"); 629 BlockDriverState *bs; 630 631 if (!strcmp(device, "all")) { 632 bdrv_commit_all(); 633 } else { 634 int ret; 635 636 bs = bdrv_find(device); 637 if (!bs) { 638 qerror_report(QERR_DEVICE_NOT_FOUND, device); 639 return; 640 } 641 ret = bdrv_commit(bs); 642 if (ret == -EBUSY) { 643 qerror_report(QERR_DEVICE_IN_USE, device); 644 return; 645 } 646 } 647 } 648 649 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, 650 bool has_format, const char *format, 651 Error **errp) 652 { 653 BlockDriverState *bs; 654 BlockDriver *drv, *old_drv, *proto_drv; 655 int ret = 0; 656 int flags; 657 char old_filename[1024]; 658 659 bs = bdrv_find(device); 660 if (!bs) { 661 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 662 return; 663 } 664 if (bdrv_in_use(bs)) { 665 error_set(errp, QERR_DEVICE_IN_USE, device); 666 return; 667 } 668 669 pstrcpy(old_filename, sizeof(old_filename), bs->filename); 670 671 old_drv = bs->drv; 672 flags = bs->open_flags; 673 674 if (!has_format) { 675 format = "qcow2"; 676 } 677 678 drv = bdrv_find_format(format); 679 if (!drv) { 680 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 681 return; 682 } 683 684 proto_drv = bdrv_find_protocol(snapshot_file); 685 if (!proto_drv) { 686 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 687 return; 688 } 689 690 ret = bdrv_img_create(snapshot_file, format, bs->filename, 691 bs->drv->format_name, NULL, -1, flags); 692 if (ret) { 693 error_set(errp, QERR_UNDEFINED_ERROR); 694 return; 695 } 696 697 bdrv_drain_all(); 698 bdrv_flush(bs); 699 700 bdrv_close(bs); 701 ret = bdrv_open(bs, snapshot_file, flags, drv); 702 /* 703 * If reopening the image file we just created fails, fall back 704 * and try to re-open the original image. If that fails too, we 705 * are in serious trouble. 706 */ 707 if (ret != 0) { 708 ret = bdrv_open(bs, old_filename, flags, old_drv); 709 if (ret != 0) { 710 error_set(errp, QERR_OPEN_FILE_FAILED, old_filename); 711 } else { 712 error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file); 713 } 714 } 715 } 716 717 718 /* New and old BlockDriverState structs for group snapshots */ 719 typedef struct BlkGroupSnapshotStates { 720 BlockDriverState *old_bs; 721 BlockDriverState *new_bs; 722 QSIMPLEQ_ENTRY(BlkGroupSnapshotStates) entry; 723 } BlkGroupSnapshotStates; 724 725 /* 726 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 727 * then we do not pivot any of the devices in the group, and abandon the 728 * snapshots 729 */ 730 void qmp_blockdev_group_snapshot_sync(SnapshotDevList *dev_list, 731 Error **errp) 732 { 733 int ret = 0; 734 SnapshotDevList *dev_entry = dev_list; 735 SnapshotDev *dev_info = NULL; 736 BlkGroupSnapshotStates *states; 737 BlockDriver *proto_drv; 738 BlockDriver *drv; 739 int flags; 740 const char *format; 741 const char *snapshot_file; 742 743 QSIMPLEQ_HEAD(snap_bdrv_states, BlkGroupSnapshotStates) snap_bdrv_states; 744 QSIMPLEQ_INIT(&snap_bdrv_states); 745 746 /* drain all i/o before any snapshots */ 747 bdrv_drain_all(); 748 749 /* We don't do anything in this loop that commits us to the snapshot */ 750 while (NULL != dev_entry) { 751 dev_info = dev_entry->value; 752 dev_entry = dev_entry->next; 753 754 states = g_malloc0(sizeof(BlkGroupSnapshotStates)); 755 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry); 756 757 states->old_bs = bdrv_find(dev_info->device); 758 759 if (!states->old_bs) { 760 error_set(errp, QERR_DEVICE_NOT_FOUND, dev_info->device); 761 goto delete_and_fail; 762 } 763 764 if (bdrv_in_use(states->old_bs)) { 765 error_set(errp, QERR_DEVICE_IN_USE, dev_info->device); 766 goto delete_and_fail; 767 } 768 769 if (!bdrv_is_read_only(states->old_bs) && 770 bdrv_is_inserted(states->old_bs)) { 771 772 if (bdrv_flush(states->old_bs)) { 773 error_set(errp, QERR_IO_ERROR); 774 goto delete_and_fail; 775 } 776 } 777 778 snapshot_file = dev_info->snapshot_file; 779 780 flags = states->old_bs->open_flags; 781 782 if (!dev_info->has_format) { 783 format = "qcow2"; 784 } else { 785 format = dev_info->format; 786 } 787 788 drv = bdrv_find_format(format); 789 if (!drv) { 790 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 791 goto delete_and_fail; 792 } 793 794 proto_drv = bdrv_find_protocol(snapshot_file); 795 if (!proto_drv) { 796 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 797 goto delete_and_fail; 798 } 799 800 /* create new image w/backing file */ 801 ret = bdrv_img_create(snapshot_file, format, 802 states->old_bs->filename, 803 drv->format_name, NULL, -1, flags); 804 if (ret) { 805 error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file); 806 goto delete_and_fail; 807 } 808 809 /* We will manually add the backing_hd field to the bs later */ 810 states->new_bs = bdrv_new(""); 811 ret = bdrv_open(states->new_bs, snapshot_file, 812 flags | BDRV_O_NO_BACKING, drv); 813 if (ret != 0) { 814 error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file); 815 goto delete_and_fail; 816 } 817 } 818 819 820 /* Now we are going to do the actual pivot. Everything up to this point 821 * is reversible, but we are committed at this point */ 822 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { 823 /* This removes our old bs from the bdrv_states, and adds the new bs */ 824 bdrv_append(states->new_bs, states->old_bs); 825 } 826 827 /* success */ 828 goto exit; 829 830 delete_and_fail: 831 /* 832 * failure, and it is all-or-none; abandon each new bs, and keep using 833 * the original bs for all images 834 */ 835 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { 836 if (states->new_bs) { 837 bdrv_delete(states->new_bs); 838 } 839 } 840 exit: 841 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { 842 g_free(states); 843 } 844 return; 845 } 846 847 848 static void eject_device(BlockDriverState *bs, int force, Error **errp) 849 { 850 if (bdrv_in_use(bs)) { 851 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 852 return; 853 } 854 if (!bdrv_dev_has_removable_media(bs)) { 855 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 856 return; 857 } 858 859 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 860 bdrv_dev_eject_request(bs, force); 861 if (!force) { 862 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 863 return; 864 } 865 } 866 867 bdrv_close(bs); 868 } 869 870 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 871 { 872 BlockDriverState *bs; 873 874 bs = bdrv_find(device); 875 if (!bs) { 876 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 877 return; 878 } 879 880 eject_device(bs, force, errp); 881 } 882 883 void qmp_block_passwd(const char *device, const char *password, Error **errp) 884 { 885 BlockDriverState *bs; 886 int err; 887 888 bs = bdrv_find(device); 889 if (!bs) { 890 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 891 return; 892 } 893 894 err = bdrv_set_key(bs, password); 895 if (err == -EINVAL) { 896 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 897 return; 898 } else if (err < 0) { 899 error_set(errp, QERR_INVALID_PASSWORD); 900 return; 901 } 902 } 903 904 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 905 int bdrv_flags, BlockDriver *drv, 906 const char *password, Error **errp) 907 { 908 if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) { 909 error_set(errp, QERR_OPEN_FILE_FAILED, filename); 910 return; 911 } 912 913 if (bdrv_key_required(bs)) { 914 if (password) { 915 if (bdrv_set_key(bs, password) < 0) { 916 error_set(errp, QERR_INVALID_PASSWORD); 917 } 918 } else { 919 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 920 bdrv_get_encrypted_filename(bs)); 921 } 922 } else if (password) { 923 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 924 } 925 } 926 927 void qmp_change_blockdev(const char *device, const char *filename, 928 bool has_format, const char *format, Error **errp) 929 { 930 BlockDriverState *bs; 931 BlockDriver *drv = NULL; 932 int bdrv_flags; 933 Error *err = NULL; 934 935 bs = bdrv_find(device); 936 if (!bs) { 937 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 938 return; 939 } 940 941 if (format) { 942 drv = bdrv_find_whitelisted_format(format); 943 if (!drv) { 944 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 945 return; 946 } 947 } 948 949 eject_device(bs, 0, &err); 950 if (error_is_set(&err)) { 951 error_propagate(errp, err); 952 return; 953 } 954 955 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 956 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 957 958 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 959 } 960 961 /* throttling disk I/O limits */ 962 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 963 int64_t bps_wr, int64_t iops, int64_t iops_rd, 964 int64_t iops_wr, Error **errp) 965 { 966 BlockIOLimit io_limits; 967 BlockDriverState *bs; 968 969 bs = bdrv_find(device); 970 if (!bs) { 971 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 972 return; 973 } 974 975 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; 976 io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; 977 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; 978 io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; 979 io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; 980 io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; 981 982 if (!do_check_io_limits(&io_limits)) { 983 error_set(errp, QERR_INVALID_PARAMETER_COMBINATION); 984 return; 985 } 986 987 bs->io_limits = io_limits; 988 bs->slice_time = BLOCK_IO_SLICE_TIME; 989 990 if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) { 991 bdrv_io_limits_enable(bs); 992 } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { 993 bdrv_io_limits_disable(bs); 994 } else { 995 if (bs->block_timer) { 996 qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); 997 } 998 } 999 } 1000 1001 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1002 { 1003 const char *id = qdict_get_str(qdict, "id"); 1004 BlockDriverState *bs; 1005 1006 bs = bdrv_find(id); 1007 if (!bs) { 1008 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1009 return -1; 1010 } 1011 if (bdrv_in_use(bs)) { 1012 qerror_report(QERR_DEVICE_IN_USE, id); 1013 return -1; 1014 } 1015 1016 /* quiesce block driver; prevent further io */ 1017 bdrv_drain_all(); 1018 bdrv_flush(bs); 1019 bdrv_close(bs); 1020 1021 /* if we have a device attached to this BlockDriverState 1022 * then we need to make the drive anonymous until the device 1023 * can be removed. If this is a drive with no device backing 1024 * then we can just get rid of the block driver state right here. 1025 */ 1026 if (bdrv_get_attached_dev(bs)) { 1027 bdrv_make_anon(bs); 1028 } else { 1029 drive_uninit(drive_get_by_blockdev(bs)); 1030 } 1031 1032 return 0; 1033 } 1034 1035 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1036 { 1037 BlockDriverState *bs; 1038 1039 bs = bdrv_find(device); 1040 if (!bs) { 1041 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1042 return; 1043 } 1044 1045 if (size < 0) { 1046 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1047 return; 1048 } 1049 1050 switch (bdrv_truncate(bs, size)) { 1051 case 0: 1052 break; 1053 case -ENOMEDIUM: 1054 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1055 break; 1056 case -ENOTSUP: 1057 error_set(errp, QERR_UNSUPPORTED); 1058 break; 1059 case -EACCES: 1060 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1061 break; 1062 case -EBUSY: 1063 error_set(errp, QERR_DEVICE_IN_USE, device); 1064 break; 1065 default: 1066 error_set(errp, QERR_UNDEFINED_ERROR); 1067 break; 1068 } 1069 } 1070 1071 static QObject *qobject_from_block_job(BlockJob *job) 1072 { 1073 return qobject_from_jsonf("{ 'type': %s," 1074 "'device': %s," 1075 "'len': %" PRId64 "," 1076 "'offset': %" PRId64 "," 1077 "'speed': %" PRId64 " }", 1078 job->job_type->job_type, 1079 bdrv_get_device_name(job->bs), 1080 job->len, 1081 job->offset, 1082 job->speed); 1083 } 1084 1085 static void block_stream_cb(void *opaque, int ret) 1086 { 1087 BlockDriverState *bs = opaque; 1088 QObject *obj; 1089 1090 trace_block_stream_cb(bs, bs->job, ret); 1091 1092 assert(bs->job); 1093 obj = qobject_from_block_job(bs->job); 1094 if (ret < 0) { 1095 QDict *dict = qobject_to_qdict(obj); 1096 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1097 } 1098 1099 if (block_job_is_cancelled(bs->job)) { 1100 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1101 } else { 1102 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1103 } 1104 qobject_decref(obj); 1105 1106 drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); 1107 } 1108 1109 void qmp_block_stream(const char *device, bool has_base, 1110 const char *base, Error **errp) 1111 { 1112 BlockDriverState *bs; 1113 BlockDriverState *base_bs = NULL; 1114 int ret; 1115 1116 bs = bdrv_find(device); 1117 if (!bs) { 1118 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1119 return; 1120 } 1121 1122 if (base) { 1123 base_bs = bdrv_find_backing_image(bs, base); 1124 if (base_bs == NULL) { 1125 error_set(errp, QERR_BASE_NOT_FOUND, base); 1126 return; 1127 } 1128 } 1129 1130 ret = stream_start(bs, base_bs, base, block_stream_cb, bs); 1131 if (ret < 0) { 1132 switch (ret) { 1133 case -EBUSY: 1134 error_set(errp, QERR_DEVICE_IN_USE, device); 1135 return; 1136 default: 1137 error_set(errp, QERR_NOT_SUPPORTED); 1138 return; 1139 } 1140 } 1141 1142 /* Grab a reference so hotplug does not delete the BlockDriverState from 1143 * underneath us. 1144 */ 1145 drive_get_ref(drive_get_by_blockdev(bs)); 1146 1147 trace_qmp_block_stream(bs, bs->job); 1148 } 1149 1150 static BlockJob *find_block_job(const char *device) 1151 { 1152 BlockDriverState *bs; 1153 1154 bs = bdrv_find(device); 1155 if (!bs || !bs->job) { 1156 return NULL; 1157 } 1158 return bs->job; 1159 } 1160 1161 void qmp_block_job_set_speed(const char *device, int64_t value, Error **errp) 1162 { 1163 BlockJob *job = find_block_job(device); 1164 1165 if (!job) { 1166 error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); 1167 return; 1168 } 1169 1170 if (block_job_set_speed(job, value) < 0) { 1171 error_set(errp, QERR_NOT_SUPPORTED); 1172 } 1173 } 1174 1175 void qmp_block_job_cancel(const char *device, Error **errp) 1176 { 1177 BlockJob *job = find_block_job(device); 1178 1179 if (!job) { 1180 error_set(errp, QERR_DEVICE_NOT_ACTIVE, device); 1181 return; 1182 } 1183 1184 trace_qmp_block_job_cancel(job); 1185 block_job_cancel(job); 1186 } 1187 1188 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 1189 { 1190 BlockJobInfoList **prev = opaque; 1191 BlockJob *job = bs->job; 1192 1193 if (job) { 1194 BlockJobInfoList *elem; 1195 BlockJobInfo *info = g_new(BlockJobInfo, 1); 1196 *info = (BlockJobInfo){ 1197 .type = g_strdup(job->job_type->job_type), 1198 .device = g_strdup(bdrv_get_device_name(bs)), 1199 .len = job->len, 1200 .offset = job->offset, 1201 .speed = job->speed, 1202 }; 1203 1204 elem = g_new0(BlockJobInfoList, 1); 1205 elem->value = info; 1206 1207 (*prev)->next = elem; 1208 *prev = elem; 1209 } 1210 } 1211 1212 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 1213 { 1214 /* Dummy is a fake list element for holding the head pointer */ 1215 BlockJobInfoList dummy = {}; 1216 BlockJobInfoList *prev = &dummy; 1217 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 1218 return dummy.next; 1219 } 1220