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-common.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_delete(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 DriveInfo *dinfo; 238 } DrivePutRefBH; 239 240 static void drive_put_ref_bh(void *opaque) 241 { 242 DrivePutRefBH *s = opaque; 243 244 drive_put_ref(s->dinfo); 245 qemu_bh_delete(s->bh); 246 g_free(s); 247 } 248 249 /* 250 * Release a drive reference in a BH 251 * 252 * It is not possible to use drive_put_ref() from a callback function when the 253 * callers still need the drive. In such cases we schedule a BH to release the 254 * reference. 255 */ 256 static void drive_put_ref_bh_schedule(DriveInfo *dinfo) 257 { 258 DrivePutRefBH *s; 259 260 s = g_new(DrivePutRefBH, 1); 261 s->bh = qemu_bh_new(drive_put_ref_bh, s); 262 s->dinfo = dinfo; 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 do_check_io_limits(BlockIOLimit *io_limits, Error **errp) 284 { 285 bool bps_flag; 286 bool iops_flag; 287 288 assert(io_limits); 289 290 bps_flag = (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] != 0) 291 && ((io_limits->bps[BLOCK_IO_LIMIT_READ] != 0) 292 || (io_limits->bps[BLOCK_IO_LIMIT_WRITE] != 0)); 293 iops_flag = (io_limits->iops[BLOCK_IO_LIMIT_TOTAL] != 0) 294 && ((io_limits->iops[BLOCK_IO_LIMIT_READ] != 0) 295 || (io_limits->iops[BLOCK_IO_LIMIT_WRITE] != 0)); 296 if (bps_flag || iops_flag) { 297 error_setg(errp, "bps(iops) and bps_rd/bps_wr(iops_rd/iops_wr) " 298 "cannot be used at the same time"); 299 return false; 300 } 301 302 if (io_limits->bps[BLOCK_IO_LIMIT_TOTAL] < 0 || 303 io_limits->bps[BLOCK_IO_LIMIT_WRITE] < 0 || 304 io_limits->bps[BLOCK_IO_LIMIT_READ] < 0 || 305 io_limits->iops[BLOCK_IO_LIMIT_TOTAL] < 0 || 306 io_limits->iops[BLOCK_IO_LIMIT_WRITE] < 0 || 307 io_limits->iops[BLOCK_IO_LIMIT_READ] < 0) { 308 error_setg(errp, "bps and iops values must be 0 or greater"); 309 return false; 310 } 311 312 return true; 313 } 314 315 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type) 316 { 317 const char *buf; 318 const char *file = NULL; 319 const char *serial; 320 const char *mediastr = ""; 321 BlockInterfaceType type; 322 enum { MEDIA_DISK, MEDIA_CDROM } media; 323 int bus_id, unit_id; 324 int cyls, heads, secs, translation; 325 BlockDriver *drv = NULL; 326 int max_devs; 327 int index; 328 int ro = 0; 329 int bdrv_flags = 0; 330 int on_read_error, on_write_error; 331 const char *devaddr; 332 DriveInfo *dinfo; 333 BlockIOLimit io_limits; 334 int snapshot = 0; 335 bool copy_on_read; 336 int ret; 337 Error *error = NULL; 338 QemuOpts *opts; 339 QDict *bs_opts; 340 const char *id; 341 342 translation = BIOS_ATA_TRANSLATION_AUTO; 343 media = MEDIA_DISK; 344 345 /* Check common options by copying from all_opts to opts, all other options 346 * are stored in bs_opts. */ 347 id = qemu_opts_id(all_opts); 348 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 349 if (error_is_set(&error)) { 350 qerror_report_err(error); 351 error_free(error); 352 return NULL; 353 } 354 355 bs_opts = qdict_new(); 356 qemu_opts_to_qdict(all_opts, bs_opts); 357 qemu_opts_absorb_qdict(opts, bs_opts, &error); 358 if (error_is_set(&error)) { 359 qerror_report_err(error); 360 error_free(error); 361 return NULL; 362 } 363 364 if (id) { 365 qdict_del(bs_opts, "id"); 366 } 367 368 /* extract parameters */ 369 bus_id = qemu_opt_get_number(opts, "bus", 0); 370 unit_id = qemu_opt_get_number(opts, "unit", -1); 371 index = qemu_opt_get_number(opts, "index", -1); 372 373 cyls = qemu_opt_get_number(opts, "cyls", 0); 374 heads = qemu_opt_get_number(opts, "heads", 0); 375 secs = qemu_opt_get_number(opts, "secs", 0); 376 377 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 378 ro = qemu_opt_get_bool(opts, "readonly", 0); 379 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 380 381 file = qemu_opt_get(opts, "file"); 382 serial = qemu_opt_get(opts, "serial"); 383 384 if ((buf = qemu_opt_get(opts, "if")) != NULL) { 385 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) 386 ; 387 if (type == IF_COUNT) { 388 error_report("unsupported bus type '%s'", buf); 389 return NULL; 390 } 391 } else { 392 type = block_default_type; 393 } 394 395 max_devs = if_max_devs[type]; 396 397 if (cyls || heads || secs) { 398 if (cyls < 1) { 399 error_report("invalid physical cyls number"); 400 return NULL; 401 } 402 if (heads < 1) { 403 error_report("invalid physical heads number"); 404 return NULL; 405 } 406 if (secs < 1) { 407 error_report("invalid physical secs number"); 408 return NULL; 409 } 410 } 411 412 if ((buf = qemu_opt_get(opts, "trans")) != NULL) { 413 if (!cyls) { 414 error_report("'%s' trans must be used with cyls, heads and secs", 415 buf); 416 return NULL; 417 } 418 if (!strcmp(buf, "none")) 419 translation = BIOS_ATA_TRANSLATION_NONE; 420 else if (!strcmp(buf, "lba")) 421 translation = BIOS_ATA_TRANSLATION_LBA; 422 else if (!strcmp(buf, "auto")) 423 translation = BIOS_ATA_TRANSLATION_AUTO; 424 else { 425 error_report("'%s' invalid translation type", buf); 426 return NULL; 427 } 428 } 429 430 if ((buf = qemu_opt_get(opts, "media")) != NULL) { 431 if (!strcmp(buf, "disk")) { 432 media = MEDIA_DISK; 433 } else if (!strcmp(buf, "cdrom")) { 434 if (cyls || secs || heads) { 435 error_report("CHS can't be set with media=%s", buf); 436 return NULL; 437 } 438 media = MEDIA_CDROM; 439 } else { 440 error_report("'%s' invalid media", buf); 441 return NULL; 442 } 443 } 444 445 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 446 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 447 error_report("invalid discard option"); 448 return NULL; 449 } 450 } 451 452 bdrv_flags |= BDRV_O_CACHE_WB; 453 if ((buf = qemu_opt_get(opts, "cache")) != NULL) { 454 if (bdrv_parse_cache_flags(buf, &bdrv_flags) != 0) { 455 error_report("invalid cache option"); 456 return NULL; 457 } 458 } 459 460 #ifdef CONFIG_LINUX_AIO 461 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 462 if (!strcmp(buf, "native")) { 463 bdrv_flags |= BDRV_O_NATIVE_AIO; 464 } else if (!strcmp(buf, "threads")) { 465 /* this is the default */ 466 } else { 467 error_report("invalid aio option"); 468 return NULL; 469 } 470 } 471 #endif 472 473 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 474 if (is_help_option(buf)) { 475 error_printf("Supported formats:"); 476 bdrv_iterate_format(bdrv_format_print, NULL); 477 error_printf("\n"); 478 return NULL; 479 } 480 drv = bdrv_find_whitelisted_format(buf); 481 if (!drv) { 482 error_report("'%s' invalid format", buf); 483 return NULL; 484 } 485 } 486 487 /* disk I/O throttling */ 488 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = 489 qemu_opt_get_number(opts, "bps", 0); 490 io_limits.bps[BLOCK_IO_LIMIT_READ] = 491 qemu_opt_get_number(opts, "bps_rd", 0); 492 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = 493 qemu_opt_get_number(opts, "bps_wr", 0); 494 io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = 495 qemu_opt_get_number(opts, "iops", 0); 496 io_limits.iops[BLOCK_IO_LIMIT_READ] = 497 qemu_opt_get_number(opts, "iops_rd", 0); 498 io_limits.iops[BLOCK_IO_LIMIT_WRITE] = 499 qemu_opt_get_number(opts, "iops_wr", 0); 500 501 if (!do_check_io_limits(&io_limits, &error)) { 502 error_report("%s", error_get_pretty(error)); 503 error_free(error); 504 return NULL; 505 } 506 507 if (qemu_opt_get(opts, "boot") != NULL) { 508 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 509 "ignored. Future versions will reject this parameter. Please " 510 "update your scripts.\n"); 511 } 512 513 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 514 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 515 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 516 error_report("werror is not supported by this bus type"); 517 return NULL; 518 } 519 520 on_write_error = parse_block_error_action(buf, 0); 521 if (on_write_error < 0) { 522 return NULL; 523 } 524 } 525 526 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 527 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 528 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 529 error_report("rerror is not supported by this bus type"); 530 return NULL; 531 } 532 533 on_read_error = parse_block_error_action(buf, 1); 534 if (on_read_error < 0) { 535 return NULL; 536 } 537 } 538 539 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { 540 if (type != IF_VIRTIO) { 541 error_report("addr is not supported by this bus type"); 542 return NULL; 543 } 544 } 545 546 /* compute bus and unit according index */ 547 548 if (index != -1) { 549 if (bus_id != 0 || unit_id != -1) { 550 error_report("index cannot be used with bus and unit"); 551 return NULL; 552 } 553 bus_id = drive_index_to_bus_id(type, index); 554 unit_id = drive_index_to_unit_id(type, index); 555 } 556 557 /* if user doesn't specify a unit_id, 558 * try to find the first free 559 */ 560 561 if (unit_id == -1) { 562 unit_id = 0; 563 while (drive_get(type, bus_id, unit_id) != NULL) { 564 unit_id++; 565 if (max_devs && unit_id >= max_devs) { 566 unit_id -= max_devs; 567 bus_id++; 568 } 569 } 570 } 571 572 /* check unit id */ 573 574 if (max_devs && unit_id >= max_devs) { 575 error_report("unit %d too big (max is %d)", 576 unit_id, max_devs - 1); 577 return NULL; 578 } 579 580 /* 581 * catch multiple definitions 582 */ 583 584 if (drive_get(type, bus_id, unit_id) != NULL) { 585 error_report("drive with bus=%d, unit=%d (index=%d) exists", 586 bus_id, unit_id, index); 587 return NULL; 588 } 589 590 /* init */ 591 592 dinfo = g_malloc0(sizeof(*dinfo)); 593 if ((buf = qemu_opts_id(opts)) != NULL) { 594 dinfo->id = g_strdup(buf); 595 } else { 596 /* no id supplied -> create one */ 597 dinfo->id = g_malloc0(32); 598 if (type == IF_IDE || type == IF_SCSI) 599 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 600 if (max_devs) 601 snprintf(dinfo->id, 32, "%s%i%s%i", 602 if_name[type], bus_id, mediastr, unit_id); 603 else 604 snprintf(dinfo->id, 32, "%s%s%i", 605 if_name[type], mediastr, unit_id); 606 } 607 dinfo->bdrv = bdrv_new(dinfo->id); 608 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 609 dinfo->bdrv->read_only = ro; 610 dinfo->devaddr = devaddr; 611 dinfo->type = type; 612 dinfo->bus = bus_id; 613 dinfo->unit = unit_id; 614 dinfo->cyls = cyls; 615 dinfo->heads = heads; 616 dinfo->secs = secs; 617 dinfo->trans = translation; 618 dinfo->opts = all_opts; 619 dinfo->refcount = 1; 620 if (serial != NULL) { 621 dinfo->serial = g_strdup(serial); 622 } 623 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 624 625 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 626 627 /* disk I/O throttling */ 628 bdrv_set_io_limits(dinfo->bdrv, &io_limits); 629 630 switch(type) { 631 case IF_IDE: 632 case IF_SCSI: 633 case IF_XEN: 634 case IF_NONE: 635 dinfo->media_cd = media == MEDIA_CDROM; 636 break; 637 case IF_SD: 638 case IF_FLOPPY: 639 case IF_PFLASH: 640 case IF_MTD: 641 break; 642 case IF_VIRTIO: 643 { 644 /* add virtio block device */ 645 QemuOpts *devopts; 646 devopts = qemu_opts_create_nofail(qemu_find_opts("device")); 647 if (arch_type == QEMU_ARCH_S390X) { 648 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 649 } else { 650 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 651 } 652 qemu_opt_set(devopts, "drive", dinfo->id); 653 if (devaddr) 654 qemu_opt_set(devopts, "addr", devaddr); 655 break; 656 } 657 default: 658 abort(); 659 } 660 if (!file || !*file) { 661 if (qdict_size(bs_opts)) { 662 file = NULL; 663 } else { 664 return dinfo; 665 } 666 } 667 if (snapshot) { 668 /* always use cache=unsafe with snapshot */ 669 bdrv_flags &= ~BDRV_O_CACHE_MASK; 670 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 671 } 672 673 if (copy_on_read) { 674 bdrv_flags |= BDRV_O_COPY_ON_READ; 675 } 676 677 if (runstate_check(RUN_STATE_INMIGRATE)) { 678 bdrv_flags |= BDRV_O_INCOMING; 679 } 680 681 if (media == MEDIA_CDROM) { 682 /* CDROM is fine for any interface, don't check. */ 683 ro = 1; 684 } else if (ro == 1) { 685 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && 686 type != IF_NONE && type != IF_PFLASH) { 687 error_report("readonly not supported by this bus type"); 688 goto err; 689 } 690 } 691 692 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 693 694 if (ro && copy_on_read) { 695 error_report("warning: disabling copy_on_read on readonly drive"); 696 } 697 698 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv); 699 bs_opts = NULL; 700 701 if (ret < 0) { 702 if (ret == -EMEDIUMTYPE) { 703 error_report("could not open disk image %s: not in %s format", 704 file ?: dinfo->id, drv->format_name); 705 } else { 706 error_report("could not open disk image %s: %s", 707 file ?: dinfo->id, strerror(-ret)); 708 } 709 goto err; 710 } 711 712 if (bdrv_key_required(dinfo->bdrv)) 713 autostart = 0; 714 715 qemu_opts_del(opts); 716 717 return dinfo; 718 719 err: 720 qemu_opts_del(opts); 721 QDECREF(bs_opts); 722 bdrv_delete(dinfo->bdrv); 723 g_free(dinfo->id); 724 QTAILQ_REMOVE(&drives, dinfo, next); 725 g_free(dinfo); 726 return NULL; 727 } 728 729 void do_commit(Monitor *mon, const QDict *qdict) 730 { 731 const char *device = qdict_get_str(qdict, "device"); 732 BlockDriverState *bs; 733 int ret; 734 735 if (!strcmp(device, "all")) { 736 ret = bdrv_commit_all(); 737 } else { 738 bs = bdrv_find(device); 739 if (!bs) { 740 monitor_printf(mon, "Device '%s' not found\n", device); 741 return; 742 } 743 ret = bdrv_commit(bs); 744 } 745 if (ret < 0) { 746 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 747 strerror(-ret)); 748 } 749 } 750 751 static void blockdev_do_action(int kind, void *data, Error **errp) 752 { 753 BlockdevAction action; 754 BlockdevActionList list; 755 756 action.kind = kind; 757 action.data = data; 758 list.value = &action; 759 list.next = NULL; 760 qmp_transaction(&list, errp); 761 } 762 763 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, 764 bool has_format, const char *format, 765 bool has_mode, enum NewImageMode mode, 766 Error **errp) 767 { 768 BlockdevSnapshot snapshot = { 769 .device = (char *) device, 770 .snapshot_file = (char *) snapshot_file, 771 .has_format = has_format, 772 .format = (char *) format, 773 .has_mode = has_mode, 774 .mode = mode, 775 }; 776 blockdev_do_action(BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, &snapshot, 777 errp); 778 } 779 780 781 /* New and old BlockDriverState structs for group snapshots */ 782 typedef struct BlkTransactionStates { 783 BlockDriverState *old_bs; 784 BlockDriverState *new_bs; 785 QSIMPLEQ_ENTRY(BlkTransactionStates) entry; 786 } BlkTransactionStates; 787 788 /* 789 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 790 * then we do not pivot any of the devices in the group, and abandon the 791 * snapshots 792 */ 793 void qmp_transaction(BlockdevActionList *dev_list, Error **errp) 794 { 795 int ret = 0; 796 BlockdevActionList *dev_entry = dev_list; 797 BlkTransactionStates *states, *next; 798 Error *local_err = NULL; 799 800 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states; 801 QSIMPLEQ_INIT(&snap_bdrv_states); 802 803 /* drain all i/o before any snapshots */ 804 bdrv_drain_all(); 805 806 /* We don't do anything in this loop that commits us to the snapshot */ 807 while (NULL != dev_entry) { 808 BlockdevAction *dev_info = NULL; 809 BlockDriver *proto_drv; 810 BlockDriver *drv; 811 int flags; 812 enum NewImageMode mode; 813 const char *new_image_file; 814 const char *device; 815 const char *format = "qcow2"; 816 817 dev_info = dev_entry->value; 818 dev_entry = dev_entry->next; 819 820 states = g_malloc0(sizeof(BlkTransactionStates)); 821 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry); 822 823 switch (dev_info->kind) { 824 case BLOCKDEV_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC: 825 device = dev_info->blockdev_snapshot_sync->device; 826 if (!dev_info->blockdev_snapshot_sync->has_mode) { 827 dev_info->blockdev_snapshot_sync->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 828 } 829 new_image_file = dev_info->blockdev_snapshot_sync->snapshot_file; 830 if (dev_info->blockdev_snapshot_sync->has_format) { 831 format = dev_info->blockdev_snapshot_sync->format; 832 } 833 mode = dev_info->blockdev_snapshot_sync->mode; 834 break; 835 default: 836 abort(); 837 } 838 839 drv = bdrv_find_format(format); 840 if (!drv) { 841 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 842 goto delete_and_fail; 843 } 844 845 states->old_bs = bdrv_find(device); 846 if (!states->old_bs) { 847 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 848 goto delete_and_fail; 849 } 850 851 if (!bdrv_is_inserted(states->old_bs)) { 852 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 853 goto delete_and_fail; 854 } 855 856 if (bdrv_in_use(states->old_bs)) { 857 error_set(errp, QERR_DEVICE_IN_USE, device); 858 goto delete_and_fail; 859 } 860 861 if (!bdrv_is_read_only(states->old_bs)) { 862 if (bdrv_flush(states->old_bs)) { 863 error_set(errp, QERR_IO_ERROR); 864 goto delete_and_fail; 865 } 866 } 867 868 flags = states->old_bs->open_flags; 869 870 proto_drv = bdrv_find_protocol(new_image_file); 871 if (!proto_drv) { 872 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 873 goto delete_and_fail; 874 } 875 876 /* create new image w/backing file */ 877 if (mode != NEW_IMAGE_MODE_EXISTING) { 878 bdrv_img_create(new_image_file, format, 879 states->old_bs->filename, 880 states->old_bs->drv->format_name, 881 NULL, -1, flags, &local_err, false); 882 if (error_is_set(&local_err)) { 883 error_propagate(errp, local_err); 884 goto delete_and_fail; 885 } 886 } 887 888 /* We will manually add the backing_hd field to the bs later */ 889 states->new_bs = bdrv_new(""); 890 /* TODO Inherit bs->options or only take explicit options with an 891 * extended QMP command? */ 892 ret = bdrv_open(states->new_bs, new_image_file, NULL, 893 flags | BDRV_O_NO_BACKING, drv); 894 if (ret != 0) { 895 error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); 896 goto delete_and_fail; 897 } 898 } 899 900 901 /* Now we are going to do the actual pivot. Everything up to this point 902 * is reversible, but we are committed at this point */ 903 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { 904 /* This removes our old bs from the bdrv_states, and adds the new bs */ 905 bdrv_append(states->new_bs, states->old_bs); 906 /* We don't need (or want) to use the transactional 907 * bdrv_reopen_multiple() across all the entries at once, because we 908 * don't want to abort all of them if one of them fails the reopen */ 909 bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR, 910 NULL); 911 } 912 913 /* success */ 914 goto exit; 915 916 delete_and_fail: 917 /* 918 * failure, and it is all-or-none; abandon each new bs, and keep using 919 * the original bs for all images 920 */ 921 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { 922 if (states->new_bs) { 923 bdrv_delete(states->new_bs); 924 } 925 } 926 exit: 927 QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) { 928 g_free(states); 929 } 930 } 931 932 933 static void eject_device(BlockDriverState *bs, int force, Error **errp) 934 { 935 if (bdrv_in_use(bs)) { 936 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 937 return; 938 } 939 if (!bdrv_dev_has_removable_media(bs)) { 940 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 941 return; 942 } 943 944 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 945 bdrv_dev_eject_request(bs, force); 946 if (!force) { 947 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 948 return; 949 } 950 } 951 952 bdrv_close(bs); 953 } 954 955 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 956 { 957 BlockDriverState *bs; 958 959 bs = bdrv_find(device); 960 if (!bs) { 961 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 962 return; 963 } 964 965 eject_device(bs, force, errp); 966 } 967 968 void qmp_block_passwd(const char *device, const char *password, Error **errp) 969 { 970 BlockDriverState *bs; 971 int err; 972 973 bs = bdrv_find(device); 974 if (!bs) { 975 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 976 return; 977 } 978 979 err = bdrv_set_key(bs, password); 980 if (err == -EINVAL) { 981 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 982 return; 983 } else if (err < 0) { 984 error_set(errp, QERR_INVALID_PASSWORD); 985 return; 986 } 987 } 988 989 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 990 int bdrv_flags, BlockDriver *drv, 991 const char *password, Error **errp) 992 { 993 if (bdrv_open(bs, filename, NULL, bdrv_flags, drv) < 0) { 994 error_set(errp, QERR_OPEN_FILE_FAILED, filename); 995 return; 996 } 997 998 if (bdrv_key_required(bs)) { 999 if (password) { 1000 if (bdrv_set_key(bs, password) < 0) { 1001 error_set(errp, QERR_INVALID_PASSWORD); 1002 } 1003 } else { 1004 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1005 bdrv_get_encrypted_filename(bs)); 1006 } 1007 } else if (password) { 1008 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1009 } 1010 } 1011 1012 void qmp_change_blockdev(const char *device, const char *filename, 1013 bool has_format, const char *format, Error **errp) 1014 { 1015 BlockDriverState *bs; 1016 BlockDriver *drv = NULL; 1017 int bdrv_flags; 1018 Error *err = NULL; 1019 1020 bs = bdrv_find(device); 1021 if (!bs) { 1022 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1023 return; 1024 } 1025 1026 if (format) { 1027 drv = bdrv_find_whitelisted_format(format); 1028 if (!drv) { 1029 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1030 return; 1031 } 1032 } 1033 1034 eject_device(bs, 0, &err); 1035 if (error_is_set(&err)) { 1036 error_propagate(errp, err); 1037 return; 1038 } 1039 1040 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1041 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1042 1043 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1044 } 1045 1046 /* throttling disk I/O limits */ 1047 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1048 int64_t bps_wr, int64_t iops, int64_t iops_rd, 1049 int64_t iops_wr, Error **errp) 1050 { 1051 BlockIOLimit io_limits; 1052 BlockDriverState *bs; 1053 1054 bs = bdrv_find(device); 1055 if (!bs) { 1056 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1057 return; 1058 } 1059 1060 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; 1061 io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; 1062 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; 1063 io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; 1064 io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; 1065 io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; 1066 1067 if (!do_check_io_limits(&io_limits, errp)) { 1068 return; 1069 } 1070 1071 bs->io_limits = io_limits; 1072 bs->slice_time = BLOCK_IO_SLICE_TIME; 1073 1074 if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) { 1075 bdrv_io_limits_enable(bs); 1076 } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { 1077 bdrv_io_limits_disable(bs); 1078 } else { 1079 if (bs->block_timer) { 1080 qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); 1081 } 1082 } 1083 } 1084 1085 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1086 { 1087 const char *id = qdict_get_str(qdict, "id"); 1088 BlockDriverState *bs; 1089 1090 bs = bdrv_find(id); 1091 if (!bs) { 1092 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1093 return -1; 1094 } 1095 if (bdrv_in_use(bs)) { 1096 qerror_report(QERR_DEVICE_IN_USE, id); 1097 return -1; 1098 } 1099 1100 /* quiesce block driver; prevent further io */ 1101 bdrv_drain_all(); 1102 bdrv_flush(bs); 1103 bdrv_close(bs); 1104 1105 /* if we have a device attached to this BlockDriverState 1106 * then we need to make the drive anonymous until the device 1107 * can be removed. If this is a drive with no device backing 1108 * then we can just get rid of the block driver state right here. 1109 */ 1110 if (bdrv_get_attached_dev(bs)) { 1111 bdrv_make_anon(bs); 1112 } else { 1113 drive_uninit(drive_get_by_blockdev(bs)); 1114 } 1115 1116 return 0; 1117 } 1118 1119 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1120 { 1121 BlockDriverState *bs; 1122 1123 bs = bdrv_find(device); 1124 if (!bs) { 1125 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1126 return; 1127 } 1128 1129 if (size < 0) { 1130 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1131 return; 1132 } 1133 1134 /* complete all in-flight operations before resizing the device */ 1135 bdrv_drain_all(); 1136 1137 switch (bdrv_truncate(bs, size)) { 1138 case 0: 1139 break; 1140 case -ENOMEDIUM: 1141 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1142 break; 1143 case -ENOTSUP: 1144 error_set(errp, QERR_UNSUPPORTED); 1145 break; 1146 case -EACCES: 1147 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1148 break; 1149 case -EBUSY: 1150 error_set(errp, QERR_DEVICE_IN_USE, device); 1151 break; 1152 default: 1153 error_set(errp, QERR_UNDEFINED_ERROR); 1154 break; 1155 } 1156 } 1157 1158 static void block_job_cb(void *opaque, int ret) 1159 { 1160 BlockDriverState *bs = opaque; 1161 QObject *obj; 1162 1163 trace_block_job_cb(bs, bs->job, ret); 1164 1165 assert(bs->job); 1166 obj = qobject_from_block_job(bs->job); 1167 if (ret < 0) { 1168 QDict *dict = qobject_to_qdict(obj); 1169 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1170 } 1171 1172 if (block_job_is_cancelled(bs->job)) { 1173 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1174 } else { 1175 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1176 } 1177 qobject_decref(obj); 1178 1179 drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); 1180 } 1181 1182 void qmp_block_stream(const char *device, bool has_base, 1183 const char *base, bool has_speed, int64_t speed, 1184 bool has_on_error, BlockdevOnError on_error, 1185 Error **errp) 1186 { 1187 BlockDriverState *bs; 1188 BlockDriverState *base_bs = NULL; 1189 Error *local_err = NULL; 1190 1191 if (!has_on_error) { 1192 on_error = BLOCKDEV_ON_ERROR_REPORT; 1193 } 1194 1195 bs = bdrv_find(device); 1196 if (!bs) { 1197 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1198 return; 1199 } 1200 1201 if (base) { 1202 base_bs = bdrv_find_backing_image(bs, base); 1203 if (base_bs == NULL) { 1204 error_set(errp, QERR_BASE_NOT_FOUND, base); 1205 return; 1206 } 1207 } 1208 1209 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1210 on_error, block_job_cb, bs, &local_err); 1211 if (error_is_set(&local_err)) { 1212 error_propagate(errp, local_err); 1213 return; 1214 } 1215 1216 /* Grab a reference so hotplug does not delete the BlockDriverState from 1217 * underneath us. 1218 */ 1219 drive_get_ref(drive_get_by_blockdev(bs)); 1220 1221 trace_qmp_block_stream(bs, bs->job); 1222 } 1223 1224 void qmp_block_commit(const char *device, 1225 bool has_base, const char *base, const char *top, 1226 bool has_speed, int64_t speed, 1227 Error **errp) 1228 { 1229 BlockDriverState *bs; 1230 BlockDriverState *base_bs, *top_bs; 1231 Error *local_err = NULL; 1232 /* This will be part of the QMP command, if/when the 1233 * BlockdevOnError change for blkmirror makes it in 1234 */ 1235 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1236 1237 /* drain all i/o before commits */ 1238 bdrv_drain_all(); 1239 1240 bs = bdrv_find(device); 1241 if (!bs) { 1242 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1243 return; 1244 } 1245 1246 /* default top_bs is the active layer */ 1247 top_bs = bs; 1248 1249 if (top) { 1250 if (strcmp(bs->filename, top) != 0) { 1251 top_bs = bdrv_find_backing_image(bs, top); 1252 } 1253 } 1254 1255 if (top_bs == NULL) { 1256 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1257 return; 1258 } 1259 1260 if (has_base && base) { 1261 base_bs = bdrv_find_backing_image(top_bs, base); 1262 } else { 1263 base_bs = bdrv_find_base(top_bs); 1264 } 1265 1266 if (base_bs == NULL) { 1267 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1268 return; 1269 } 1270 1271 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1272 &local_err); 1273 if (local_err != NULL) { 1274 error_propagate(errp, local_err); 1275 return; 1276 } 1277 /* Grab a reference so hotplug does not delete the BlockDriverState from 1278 * underneath us. 1279 */ 1280 drive_get_ref(drive_get_by_blockdev(bs)); 1281 } 1282 1283 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 1284 1285 void qmp_drive_mirror(const char *device, const char *target, 1286 bool has_format, const char *format, 1287 enum MirrorSyncMode sync, 1288 bool has_mode, enum NewImageMode mode, 1289 bool has_speed, int64_t speed, 1290 bool has_granularity, uint32_t granularity, 1291 bool has_buf_size, int64_t buf_size, 1292 bool has_on_source_error, BlockdevOnError on_source_error, 1293 bool has_on_target_error, BlockdevOnError on_target_error, 1294 Error **errp) 1295 { 1296 BlockDriverState *bs; 1297 BlockDriverState *source, *target_bs; 1298 BlockDriver *proto_drv; 1299 BlockDriver *drv = NULL; 1300 Error *local_err = NULL; 1301 int flags; 1302 uint64_t size; 1303 int ret; 1304 1305 if (!has_speed) { 1306 speed = 0; 1307 } 1308 if (!has_on_source_error) { 1309 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1310 } 1311 if (!has_on_target_error) { 1312 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1313 } 1314 if (!has_mode) { 1315 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1316 } 1317 if (!has_granularity) { 1318 granularity = 0; 1319 } 1320 if (!has_buf_size) { 1321 buf_size = DEFAULT_MIRROR_BUF_SIZE; 1322 } 1323 1324 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 1325 error_set(errp, QERR_INVALID_PARAMETER, device); 1326 return; 1327 } 1328 if (granularity & (granularity - 1)) { 1329 error_set(errp, QERR_INVALID_PARAMETER, device); 1330 return; 1331 } 1332 1333 bs = bdrv_find(device); 1334 if (!bs) { 1335 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1336 return; 1337 } 1338 1339 if (!bdrv_is_inserted(bs)) { 1340 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1341 return; 1342 } 1343 1344 if (!has_format) { 1345 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1346 } 1347 if (format) { 1348 drv = bdrv_find_format(format); 1349 if (!drv) { 1350 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1351 return; 1352 } 1353 } 1354 1355 if (bdrv_in_use(bs)) { 1356 error_set(errp, QERR_DEVICE_IN_USE, device); 1357 return; 1358 } 1359 1360 flags = bs->open_flags | BDRV_O_RDWR; 1361 source = bs->backing_hd; 1362 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 1363 sync = MIRROR_SYNC_MODE_FULL; 1364 } 1365 1366 proto_drv = bdrv_find_protocol(target); 1367 if (!proto_drv) { 1368 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1369 return; 1370 } 1371 1372 bdrv_get_geometry(bs, &size); 1373 size *= 512; 1374 if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) { 1375 /* create new image w/o backing file */ 1376 assert(format && drv); 1377 bdrv_img_create(target, format, 1378 NULL, NULL, NULL, size, flags, &local_err, false); 1379 } else { 1380 switch (mode) { 1381 case NEW_IMAGE_MODE_EXISTING: 1382 ret = 0; 1383 break; 1384 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 1385 /* create new image with backing file */ 1386 bdrv_img_create(target, format, 1387 source->filename, 1388 source->drv->format_name, 1389 NULL, size, flags, &local_err, false); 1390 break; 1391 default: 1392 abort(); 1393 } 1394 } 1395 1396 if (error_is_set(&local_err)) { 1397 error_propagate(errp, local_err); 1398 return; 1399 } 1400 1401 /* Mirroring takes care of copy-on-write using the source's backing 1402 * file. 1403 */ 1404 target_bs = bdrv_new(""); 1405 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv); 1406 1407 if (ret < 0) { 1408 bdrv_delete(target_bs); 1409 error_set(errp, QERR_OPEN_FILE_FAILED, target); 1410 return; 1411 } 1412 1413 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 1414 on_source_error, on_target_error, 1415 block_job_cb, bs, &local_err); 1416 if (local_err != NULL) { 1417 bdrv_delete(target_bs); 1418 error_propagate(errp, local_err); 1419 return; 1420 } 1421 1422 /* Grab a reference so hotplug does not delete the BlockDriverState from 1423 * underneath us. 1424 */ 1425 drive_get_ref(drive_get_by_blockdev(bs)); 1426 } 1427 1428 static BlockJob *find_block_job(const char *device) 1429 { 1430 BlockDriverState *bs; 1431 1432 bs = bdrv_find(device); 1433 if (!bs || !bs->job) { 1434 return NULL; 1435 } 1436 return bs->job; 1437 } 1438 1439 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 1440 { 1441 BlockJob *job = find_block_job(device); 1442 1443 if (!job) { 1444 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1445 return; 1446 } 1447 1448 block_job_set_speed(job, speed, errp); 1449 } 1450 1451 void qmp_block_job_cancel(const char *device, 1452 bool has_force, bool force, Error **errp) 1453 { 1454 BlockJob *job = find_block_job(device); 1455 1456 if (!has_force) { 1457 force = false; 1458 } 1459 1460 if (!job) { 1461 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1462 return; 1463 } 1464 if (job->paused && !force) { 1465 error_set(errp, QERR_BLOCK_JOB_PAUSED, device); 1466 return; 1467 } 1468 1469 trace_qmp_block_job_cancel(job); 1470 block_job_cancel(job); 1471 } 1472 1473 void qmp_block_job_pause(const char *device, Error **errp) 1474 { 1475 BlockJob *job = find_block_job(device); 1476 1477 if (!job) { 1478 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1479 return; 1480 } 1481 1482 trace_qmp_block_job_pause(job); 1483 block_job_pause(job); 1484 } 1485 1486 void qmp_block_job_resume(const char *device, Error **errp) 1487 { 1488 BlockJob *job = find_block_job(device); 1489 1490 if (!job) { 1491 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1492 return; 1493 } 1494 1495 trace_qmp_block_job_resume(job); 1496 block_job_resume(job); 1497 } 1498 1499 void qmp_block_job_complete(const char *device, Error **errp) 1500 { 1501 BlockJob *job = find_block_job(device); 1502 1503 if (!job) { 1504 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1505 return; 1506 } 1507 1508 trace_qmp_block_job_complete(job); 1509 block_job_complete(job, errp); 1510 } 1511 1512 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 1513 { 1514 BlockJobInfoList **prev = opaque; 1515 BlockJob *job = bs->job; 1516 1517 if (job) { 1518 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 1519 elem->value = block_job_query(bs->job); 1520 (*prev)->next = elem; 1521 *prev = elem; 1522 } 1523 } 1524 1525 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 1526 { 1527 /* Dummy is a fake list element for holding the head pointer */ 1528 BlockJobInfoList dummy = {}; 1529 BlockJobInfoList *prev = &dummy; 1530 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 1531 return dummy.next; 1532 } 1533 1534 QemuOptsList qemu_common_drive_opts = { 1535 .name = "drive", 1536 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 1537 .desc = { 1538 { 1539 .name = "bus", 1540 .type = QEMU_OPT_NUMBER, 1541 .help = "bus number", 1542 },{ 1543 .name = "unit", 1544 .type = QEMU_OPT_NUMBER, 1545 .help = "unit number (i.e. lun for scsi)", 1546 },{ 1547 .name = "if", 1548 .type = QEMU_OPT_STRING, 1549 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 1550 },{ 1551 .name = "index", 1552 .type = QEMU_OPT_NUMBER, 1553 .help = "index number", 1554 },{ 1555 .name = "cyls", 1556 .type = QEMU_OPT_NUMBER, 1557 .help = "number of cylinders (ide disk geometry)", 1558 },{ 1559 .name = "heads", 1560 .type = QEMU_OPT_NUMBER, 1561 .help = "number of heads (ide disk geometry)", 1562 },{ 1563 .name = "secs", 1564 .type = QEMU_OPT_NUMBER, 1565 .help = "number of sectors (ide disk geometry)", 1566 },{ 1567 .name = "trans", 1568 .type = QEMU_OPT_STRING, 1569 .help = "chs translation (auto, lba. none)", 1570 },{ 1571 .name = "media", 1572 .type = QEMU_OPT_STRING, 1573 .help = "media type (disk, cdrom)", 1574 },{ 1575 .name = "snapshot", 1576 .type = QEMU_OPT_BOOL, 1577 .help = "enable/disable snapshot mode", 1578 },{ 1579 .name = "file", 1580 .type = QEMU_OPT_STRING, 1581 .help = "disk image", 1582 },{ 1583 .name = "discard", 1584 .type = QEMU_OPT_STRING, 1585 .help = "discard operation (ignore/off, unmap/on)", 1586 },{ 1587 .name = "cache", 1588 .type = QEMU_OPT_STRING, 1589 .help = "host cache usage (none, writeback, writethrough, " 1590 "directsync, unsafe)", 1591 },{ 1592 .name = "aio", 1593 .type = QEMU_OPT_STRING, 1594 .help = "host AIO implementation (threads, native)", 1595 },{ 1596 .name = "format", 1597 .type = QEMU_OPT_STRING, 1598 .help = "disk format (raw, qcow2, ...)", 1599 },{ 1600 .name = "serial", 1601 .type = QEMU_OPT_STRING, 1602 .help = "disk serial number", 1603 },{ 1604 .name = "rerror", 1605 .type = QEMU_OPT_STRING, 1606 .help = "read error action", 1607 },{ 1608 .name = "werror", 1609 .type = QEMU_OPT_STRING, 1610 .help = "write error action", 1611 },{ 1612 .name = "addr", 1613 .type = QEMU_OPT_STRING, 1614 .help = "pci address (virtio only)", 1615 },{ 1616 .name = "readonly", 1617 .type = QEMU_OPT_BOOL, 1618 .help = "open drive file as read-only", 1619 },{ 1620 .name = "iops", 1621 .type = QEMU_OPT_NUMBER, 1622 .help = "limit total I/O operations per second", 1623 },{ 1624 .name = "iops_rd", 1625 .type = QEMU_OPT_NUMBER, 1626 .help = "limit read operations per second", 1627 },{ 1628 .name = "iops_wr", 1629 .type = QEMU_OPT_NUMBER, 1630 .help = "limit write operations per second", 1631 },{ 1632 .name = "bps", 1633 .type = QEMU_OPT_NUMBER, 1634 .help = "limit total bytes per second", 1635 },{ 1636 .name = "bps_rd", 1637 .type = QEMU_OPT_NUMBER, 1638 .help = "limit read bytes per second", 1639 },{ 1640 .name = "bps_wr", 1641 .type = QEMU_OPT_NUMBER, 1642 .help = "limit write bytes per second", 1643 },{ 1644 .name = "copy-on-read", 1645 .type = QEMU_OPT_BOOL, 1646 .help = "copy read data from backing file into image file", 1647 },{ 1648 .name = "boot", 1649 .type = QEMU_OPT_BOOL, 1650 .help = "(deprecated, ignored)", 1651 }, 1652 { /* end of list */ } 1653 }, 1654 }; 1655 1656 QemuOptsList qemu_drive_opts = { 1657 .name = "drive", 1658 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 1659 .desc = { 1660 /* 1661 * no elements => accept any params 1662 * validation will happen later 1663 */ 1664 { /* end of list */ } 1665 }, 1666 }; 1667