1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "sysemu/blockdev.h" 34 #include "hw/block/block.h" 35 #include "block/blockjob.h" 36 #include "monitor/monitor.h" 37 #include "qapi/qmp/qerror.h" 38 #include "qemu/option.h" 39 #include "qemu/config-file.h" 40 #include "qapi/qmp/types.h" 41 #include "sysemu/sysemu.h" 42 #include "block/block_int.h" 43 #include "qmp-commands.h" 44 #include "trace.h" 45 #include "sysemu/arch_init.h" 46 47 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 48 extern QemuOptsList qemu_common_drive_opts; 49 50 static const char *const if_name[IF_COUNT] = { 51 [IF_NONE] = "none", 52 [IF_IDE] = "ide", 53 [IF_SCSI] = "scsi", 54 [IF_FLOPPY] = "floppy", 55 [IF_PFLASH] = "pflash", 56 [IF_MTD] = "mtd", 57 [IF_SD] = "sd", 58 [IF_VIRTIO] = "virtio", 59 [IF_XEN] = "xen", 60 }; 61 62 static const int if_max_devs[IF_COUNT] = { 63 /* 64 * Do not change these numbers! They govern how drive option 65 * index maps to unit and bus. That mapping is ABI. 66 * 67 * All controllers used to imlement if=T drives need to support 68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 69 * Otherwise, some index values map to "impossible" bus, unit 70 * values. 71 * 72 * For instance, if you change [IF_SCSI] to 255, -drive 73 * if=scsi,index=12 no longer means bus=1,unit=5, but 74 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 75 * the drive can't be set up. Regression. 76 */ 77 [IF_IDE] = 2, 78 [IF_SCSI] = 7, 79 }; 80 81 /* 82 * We automatically delete the drive when a device using it gets 83 * unplugged. Questionable feature, but we can't just drop it. 84 * Device models call blockdev_mark_auto_del() to schedule the 85 * automatic deletion, and generic qdev code calls blockdev_auto_del() 86 * when deletion is actually safe. 87 */ 88 void blockdev_mark_auto_del(BlockDriverState *bs) 89 { 90 DriveInfo *dinfo = drive_get_by_blockdev(bs); 91 92 if (bs->job) { 93 block_job_cancel(bs->job); 94 } 95 if (dinfo) { 96 dinfo->auto_del = 1; 97 } 98 } 99 100 void blockdev_auto_del(BlockDriverState *bs) 101 { 102 DriveInfo *dinfo = drive_get_by_blockdev(bs); 103 104 if (dinfo && dinfo->auto_del) { 105 drive_put_ref(dinfo); 106 } 107 } 108 109 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 110 { 111 int max_devs = if_max_devs[type]; 112 return max_devs ? index / max_devs : 0; 113 } 114 115 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 116 { 117 int max_devs = if_max_devs[type]; 118 return max_devs ? index % max_devs : index; 119 } 120 121 QemuOpts *drive_def(const char *optstr) 122 { 123 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 124 } 125 126 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 127 const char *optstr) 128 { 129 QemuOpts *opts; 130 char buf[32]; 131 132 opts = drive_def(optstr); 133 if (!opts) { 134 return NULL; 135 } 136 if (type != IF_DEFAULT) { 137 qemu_opt_set(opts, "if", if_name[type]); 138 } 139 if (index >= 0) { 140 snprintf(buf, sizeof(buf), "%d", index); 141 qemu_opt_set(opts, "index", buf); 142 } 143 if (file) 144 qemu_opt_set(opts, "file", file); 145 return opts; 146 } 147 148 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 149 { 150 DriveInfo *dinfo; 151 152 /* seek interface, bus and unit */ 153 154 QTAILQ_FOREACH(dinfo, &drives, next) { 155 if (dinfo->type == type && 156 dinfo->bus == bus && 157 dinfo->unit == unit) 158 return dinfo; 159 } 160 161 return NULL; 162 } 163 164 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 165 { 166 return drive_get(type, 167 drive_index_to_bus_id(type, index), 168 drive_index_to_unit_id(type, index)); 169 } 170 171 int drive_get_max_bus(BlockInterfaceType type) 172 { 173 int max_bus; 174 DriveInfo *dinfo; 175 176 max_bus = -1; 177 QTAILQ_FOREACH(dinfo, &drives, next) { 178 if(dinfo->type == type && 179 dinfo->bus > max_bus) 180 max_bus = dinfo->bus; 181 } 182 return max_bus; 183 } 184 185 /* Get a block device. This should only be used for single-drive devices 186 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 187 appropriate bus. */ 188 DriveInfo *drive_get_next(BlockInterfaceType type) 189 { 190 static int next_block_unit[IF_COUNT]; 191 192 return drive_get(type, 0, next_block_unit[type]++); 193 } 194 195 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 196 { 197 DriveInfo *dinfo; 198 199 QTAILQ_FOREACH(dinfo, &drives, next) { 200 if (dinfo->bdrv == bs) { 201 return dinfo; 202 } 203 } 204 return NULL; 205 } 206 207 static void bdrv_format_print(void *opaque, const char *name) 208 { 209 error_printf(" %s", name); 210 } 211 212 static void drive_uninit(DriveInfo *dinfo) 213 { 214 qemu_opts_del(dinfo->opts); 215 bdrv_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, ro); 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 TransactionAction action; 754 TransactionActionList 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(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 777 &snapshot, errp); 778 } 779 780 781 /* New and old BlockDriverState structs for group snapshots */ 782 783 typedef struct BlkTransactionStates BlkTransactionStates; 784 785 /* Only prepare() may fail. In a single transaction, only one of commit() or 786 abort() will be called, clean() will always be called if it present. */ 787 typedef struct BdrvActionOps { 788 /* Size of state struct, in bytes. */ 789 size_t instance_size; 790 /* Prepare the work, must NOT be NULL. */ 791 void (*prepare)(BlkTransactionStates *common, Error **errp); 792 /* Commit the changes, must NOT be NULL. */ 793 void (*commit)(BlkTransactionStates *common); 794 /* Abort the changes on fail, can be NULL. */ 795 void (*abort)(BlkTransactionStates *common); 796 /* Clean up resource in the end, can be NULL. */ 797 void (*clean)(BlkTransactionStates *common); 798 } BdrvActionOps; 799 800 /* 801 * This structure must be arranged as first member in child type, assuming 802 * that compiler will also arrange it to the same address with parent instance. 803 * Later it will be used in free(). 804 */ 805 struct BlkTransactionStates { 806 TransactionAction *action; 807 const BdrvActionOps *ops; 808 QSIMPLEQ_ENTRY(BlkTransactionStates) entry; 809 }; 810 811 /* external snapshot private data */ 812 typedef struct ExternalSnapshotStates { 813 BlkTransactionStates common; 814 BlockDriverState *old_bs; 815 BlockDriverState *new_bs; 816 } ExternalSnapshotStates; 817 818 static void external_snapshot_prepare(BlkTransactionStates *common, 819 Error **errp) 820 { 821 BlockDriver *proto_drv; 822 BlockDriver *drv; 823 int flags, ret; 824 Error *local_err = NULL; 825 const char *device; 826 const char *new_image_file; 827 const char *format = "qcow2"; 828 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 829 ExternalSnapshotStates *states = 830 DO_UPCAST(ExternalSnapshotStates, common, common); 831 TransactionAction *action = common->action; 832 833 /* get parameters */ 834 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 835 836 device = action->blockdev_snapshot_sync->device; 837 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 838 if (action->blockdev_snapshot_sync->has_format) { 839 format = action->blockdev_snapshot_sync->format; 840 } 841 if (action->blockdev_snapshot_sync->has_mode) { 842 mode = action->blockdev_snapshot_sync->mode; 843 } 844 845 /* start processing */ 846 drv = bdrv_find_format(format); 847 if (!drv) { 848 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 849 return; 850 } 851 852 states->old_bs = bdrv_find(device); 853 if (!states->old_bs) { 854 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 855 return; 856 } 857 858 if (!bdrv_is_inserted(states->old_bs)) { 859 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 860 return; 861 } 862 863 if (bdrv_in_use(states->old_bs)) { 864 error_set(errp, QERR_DEVICE_IN_USE, device); 865 return; 866 } 867 868 if (!bdrv_is_read_only(states->old_bs)) { 869 if (bdrv_flush(states->old_bs)) { 870 error_set(errp, QERR_IO_ERROR); 871 return; 872 } 873 } 874 875 flags = states->old_bs->open_flags; 876 877 proto_drv = bdrv_find_protocol(new_image_file); 878 if (!proto_drv) { 879 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 880 return; 881 } 882 883 /* create new image w/backing file */ 884 if (mode != NEW_IMAGE_MODE_EXISTING) { 885 bdrv_img_create(new_image_file, format, 886 states->old_bs->filename, 887 states->old_bs->drv->format_name, 888 NULL, -1, flags, &local_err, false); 889 if (error_is_set(&local_err)) { 890 error_propagate(errp, local_err); 891 return; 892 } 893 } 894 895 /* We will manually add the backing_hd field to the bs later */ 896 states->new_bs = bdrv_new(""); 897 /* TODO Inherit bs->options or only take explicit options with an 898 * extended QMP command? */ 899 ret = bdrv_open(states->new_bs, new_image_file, NULL, 900 flags | BDRV_O_NO_BACKING, drv); 901 if (ret != 0) { 902 error_setg_file_open(errp, -ret, new_image_file); 903 } 904 } 905 906 static void external_snapshot_commit(BlkTransactionStates *common) 907 { 908 ExternalSnapshotStates *states = 909 DO_UPCAST(ExternalSnapshotStates, common, common); 910 911 /* This removes our old bs from the bdrv_states, and adds the new bs */ 912 bdrv_append(states->new_bs, states->old_bs); 913 /* We don't need (or want) to use the transactional 914 * bdrv_reopen_multiple() across all the entries at once, because we 915 * don't want to abort all of them if one of them fails the reopen */ 916 bdrv_reopen(states->new_bs, states->new_bs->open_flags & ~BDRV_O_RDWR, 917 NULL); 918 } 919 920 static void external_snapshot_abort(BlkTransactionStates *common) 921 { 922 ExternalSnapshotStates *states = 923 DO_UPCAST(ExternalSnapshotStates, common, common); 924 if (states->new_bs) { 925 bdrv_delete(states->new_bs); 926 } 927 } 928 929 static const BdrvActionOps actions[] = { 930 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 931 .instance_size = sizeof(ExternalSnapshotStates), 932 .prepare = external_snapshot_prepare, 933 .commit = external_snapshot_commit, 934 .abort = external_snapshot_abort, 935 }, 936 }; 937 938 /* 939 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 940 * then we do not pivot any of the devices in the group, and abandon the 941 * snapshots 942 */ 943 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 944 { 945 TransactionActionList *dev_entry = dev_list; 946 BlkTransactionStates *states, *next; 947 Error *local_err = NULL; 948 949 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionStates) snap_bdrv_states; 950 QSIMPLEQ_INIT(&snap_bdrv_states); 951 952 /* drain all i/o before any snapshots */ 953 bdrv_drain_all(); 954 955 /* We don't do anything in this loop that commits us to the snapshot */ 956 while (NULL != dev_entry) { 957 TransactionAction *dev_info = NULL; 958 const BdrvActionOps *ops; 959 960 dev_info = dev_entry->value; 961 dev_entry = dev_entry->next; 962 963 assert(dev_info->kind < ARRAY_SIZE(actions)); 964 965 ops = &actions[dev_info->kind]; 966 states = g_malloc0(ops->instance_size); 967 states->ops = ops; 968 states->action = dev_info; 969 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, states, entry); 970 971 states->ops->prepare(states, &local_err); 972 if (error_is_set(&local_err)) { 973 error_propagate(errp, local_err); 974 goto delete_and_fail; 975 } 976 } 977 978 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { 979 states->ops->commit(states); 980 } 981 982 /* success */ 983 goto exit; 984 985 delete_and_fail: 986 /* 987 * failure, and it is all-or-none; abandon each new bs, and keep using 988 * the original bs for all images 989 */ 990 QSIMPLEQ_FOREACH(states, &snap_bdrv_states, entry) { 991 if (states->ops->abort) { 992 states->ops->abort(states); 993 } 994 } 995 exit: 996 QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) { 997 if (states->ops->clean) { 998 states->ops->clean(states); 999 } 1000 g_free(states); 1001 } 1002 } 1003 1004 1005 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1006 { 1007 if (bdrv_in_use(bs)) { 1008 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1009 return; 1010 } 1011 if (!bdrv_dev_has_removable_media(bs)) { 1012 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 1013 return; 1014 } 1015 1016 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1017 bdrv_dev_eject_request(bs, force); 1018 if (!force) { 1019 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 1020 return; 1021 } 1022 } 1023 1024 bdrv_close(bs); 1025 } 1026 1027 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1028 { 1029 BlockDriverState *bs; 1030 1031 bs = bdrv_find(device); 1032 if (!bs) { 1033 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1034 return; 1035 } 1036 1037 eject_device(bs, force, errp); 1038 } 1039 1040 void qmp_block_passwd(const char *device, const char *password, Error **errp) 1041 { 1042 BlockDriverState *bs; 1043 int err; 1044 1045 bs = bdrv_find(device); 1046 if (!bs) { 1047 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1048 return; 1049 } 1050 1051 err = bdrv_set_key(bs, password); 1052 if (err == -EINVAL) { 1053 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1054 return; 1055 } else if (err < 0) { 1056 error_set(errp, QERR_INVALID_PASSWORD); 1057 return; 1058 } 1059 } 1060 1061 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1062 int bdrv_flags, BlockDriver *drv, 1063 const char *password, Error **errp) 1064 { 1065 int ret; 1066 1067 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv); 1068 if (ret < 0) { 1069 error_setg_file_open(errp, -ret, filename); 1070 return; 1071 } 1072 1073 if (bdrv_key_required(bs)) { 1074 if (password) { 1075 if (bdrv_set_key(bs, password) < 0) { 1076 error_set(errp, QERR_INVALID_PASSWORD); 1077 } 1078 } else { 1079 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1080 bdrv_get_encrypted_filename(bs)); 1081 } 1082 } else if (password) { 1083 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1084 } 1085 } 1086 1087 void qmp_change_blockdev(const char *device, const char *filename, 1088 bool has_format, const char *format, Error **errp) 1089 { 1090 BlockDriverState *bs; 1091 BlockDriver *drv = NULL; 1092 int bdrv_flags; 1093 Error *err = NULL; 1094 1095 bs = bdrv_find(device); 1096 if (!bs) { 1097 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1098 return; 1099 } 1100 1101 if (format) { 1102 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1103 if (!drv) { 1104 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1105 return; 1106 } 1107 } 1108 1109 eject_device(bs, 0, &err); 1110 if (error_is_set(&err)) { 1111 error_propagate(errp, err); 1112 return; 1113 } 1114 1115 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1116 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1117 1118 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1119 } 1120 1121 /* throttling disk I/O limits */ 1122 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1123 int64_t bps_wr, int64_t iops, int64_t iops_rd, 1124 int64_t iops_wr, Error **errp) 1125 { 1126 BlockIOLimit io_limits; 1127 BlockDriverState *bs; 1128 1129 bs = bdrv_find(device); 1130 if (!bs) { 1131 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1132 return; 1133 } 1134 1135 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; 1136 io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; 1137 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; 1138 io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; 1139 io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; 1140 io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; 1141 1142 if (!do_check_io_limits(&io_limits, errp)) { 1143 return; 1144 } 1145 1146 bs->io_limits = io_limits; 1147 1148 if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) { 1149 bdrv_io_limits_enable(bs); 1150 } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { 1151 bdrv_io_limits_disable(bs); 1152 } else { 1153 if (bs->block_timer) { 1154 qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); 1155 } 1156 } 1157 } 1158 1159 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1160 { 1161 const char *id = qdict_get_str(qdict, "id"); 1162 BlockDriverState *bs; 1163 1164 bs = bdrv_find(id); 1165 if (!bs) { 1166 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1167 return -1; 1168 } 1169 if (bdrv_in_use(bs)) { 1170 qerror_report(QERR_DEVICE_IN_USE, id); 1171 return -1; 1172 } 1173 1174 /* quiesce block driver; prevent further io */ 1175 bdrv_drain_all(); 1176 bdrv_flush(bs); 1177 bdrv_close(bs); 1178 1179 /* if we have a device attached to this BlockDriverState 1180 * then we need to make the drive anonymous until the device 1181 * can be removed. If this is a drive with no device backing 1182 * then we can just get rid of the block driver state right here. 1183 */ 1184 if (bdrv_get_attached_dev(bs)) { 1185 bdrv_make_anon(bs); 1186 1187 /* Further I/O must not pause the guest */ 1188 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1189 BLOCKDEV_ON_ERROR_REPORT); 1190 } else { 1191 drive_uninit(drive_get_by_blockdev(bs)); 1192 } 1193 1194 return 0; 1195 } 1196 1197 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1198 { 1199 BlockDriverState *bs; 1200 int ret; 1201 1202 bs = bdrv_find(device); 1203 if (!bs) { 1204 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1205 return; 1206 } 1207 1208 if (size < 0) { 1209 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1210 return; 1211 } 1212 1213 /* complete all in-flight operations before resizing the device */ 1214 bdrv_drain_all(); 1215 1216 ret = bdrv_truncate(bs, size); 1217 switch (ret) { 1218 case 0: 1219 break; 1220 case -ENOMEDIUM: 1221 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1222 break; 1223 case -ENOTSUP: 1224 error_set(errp, QERR_UNSUPPORTED); 1225 break; 1226 case -EACCES: 1227 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1228 break; 1229 case -EBUSY: 1230 error_set(errp, QERR_DEVICE_IN_USE, device); 1231 break; 1232 default: 1233 error_setg_errno(errp, -ret, "Could not resize"); 1234 break; 1235 } 1236 } 1237 1238 static void block_job_cb(void *opaque, int ret) 1239 { 1240 BlockDriverState *bs = opaque; 1241 QObject *obj; 1242 1243 trace_block_job_cb(bs, bs->job, ret); 1244 1245 assert(bs->job); 1246 obj = qobject_from_block_job(bs->job); 1247 if (ret < 0) { 1248 QDict *dict = qobject_to_qdict(obj); 1249 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1250 } 1251 1252 if (block_job_is_cancelled(bs->job)) { 1253 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1254 } else { 1255 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1256 } 1257 qobject_decref(obj); 1258 1259 drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); 1260 } 1261 1262 void qmp_block_stream(const char *device, bool has_base, 1263 const char *base, bool has_speed, int64_t speed, 1264 bool has_on_error, BlockdevOnError on_error, 1265 Error **errp) 1266 { 1267 BlockDriverState *bs; 1268 BlockDriverState *base_bs = NULL; 1269 Error *local_err = NULL; 1270 1271 if (!has_on_error) { 1272 on_error = BLOCKDEV_ON_ERROR_REPORT; 1273 } 1274 1275 bs = bdrv_find(device); 1276 if (!bs) { 1277 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1278 return; 1279 } 1280 1281 if (base) { 1282 base_bs = bdrv_find_backing_image(bs, base); 1283 if (base_bs == NULL) { 1284 error_set(errp, QERR_BASE_NOT_FOUND, base); 1285 return; 1286 } 1287 } 1288 1289 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1290 on_error, block_job_cb, bs, &local_err); 1291 if (error_is_set(&local_err)) { 1292 error_propagate(errp, local_err); 1293 return; 1294 } 1295 1296 /* Grab a reference so hotplug does not delete the BlockDriverState from 1297 * underneath us. 1298 */ 1299 drive_get_ref(drive_get_by_blockdev(bs)); 1300 1301 trace_qmp_block_stream(bs, bs->job); 1302 } 1303 1304 void qmp_block_commit(const char *device, 1305 bool has_base, const char *base, const char *top, 1306 bool has_speed, int64_t speed, 1307 Error **errp) 1308 { 1309 BlockDriverState *bs; 1310 BlockDriverState *base_bs, *top_bs; 1311 Error *local_err = NULL; 1312 /* This will be part of the QMP command, if/when the 1313 * BlockdevOnError change for blkmirror makes it in 1314 */ 1315 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1316 1317 /* drain all i/o before commits */ 1318 bdrv_drain_all(); 1319 1320 bs = bdrv_find(device); 1321 if (!bs) { 1322 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1323 return; 1324 } 1325 1326 /* default top_bs is the active layer */ 1327 top_bs = bs; 1328 1329 if (top) { 1330 if (strcmp(bs->filename, top) != 0) { 1331 top_bs = bdrv_find_backing_image(bs, top); 1332 } 1333 } 1334 1335 if (top_bs == NULL) { 1336 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1337 return; 1338 } 1339 1340 if (has_base && base) { 1341 base_bs = bdrv_find_backing_image(top_bs, base); 1342 } else { 1343 base_bs = bdrv_find_base(top_bs); 1344 } 1345 1346 if (base_bs == NULL) { 1347 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1348 return; 1349 } 1350 1351 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1352 &local_err); 1353 if (local_err != NULL) { 1354 error_propagate(errp, local_err); 1355 return; 1356 } 1357 /* Grab a reference so hotplug does not delete the BlockDriverState from 1358 * underneath us. 1359 */ 1360 drive_get_ref(drive_get_by_blockdev(bs)); 1361 } 1362 1363 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 1364 1365 void qmp_drive_mirror(const char *device, const char *target, 1366 bool has_format, const char *format, 1367 enum MirrorSyncMode sync, 1368 bool has_mode, enum NewImageMode mode, 1369 bool has_speed, int64_t speed, 1370 bool has_granularity, uint32_t granularity, 1371 bool has_buf_size, int64_t buf_size, 1372 bool has_on_source_error, BlockdevOnError on_source_error, 1373 bool has_on_target_error, BlockdevOnError on_target_error, 1374 Error **errp) 1375 { 1376 BlockDriverState *bs; 1377 BlockDriverState *source, *target_bs; 1378 BlockDriver *proto_drv; 1379 BlockDriver *drv = NULL; 1380 Error *local_err = NULL; 1381 int flags; 1382 uint64_t size; 1383 int ret; 1384 1385 if (!has_speed) { 1386 speed = 0; 1387 } 1388 if (!has_on_source_error) { 1389 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1390 } 1391 if (!has_on_target_error) { 1392 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1393 } 1394 if (!has_mode) { 1395 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1396 } 1397 if (!has_granularity) { 1398 granularity = 0; 1399 } 1400 if (!has_buf_size) { 1401 buf_size = DEFAULT_MIRROR_BUF_SIZE; 1402 } 1403 1404 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 1405 error_set(errp, QERR_INVALID_PARAMETER, device); 1406 return; 1407 } 1408 if (granularity & (granularity - 1)) { 1409 error_set(errp, QERR_INVALID_PARAMETER, device); 1410 return; 1411 } 1412 1413 bs = bdrv_find(device); 1414 if (!bs) { 1415 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1416 return; 1417 } 1418 1419 if (!bdrv_is_inserted(bs)) { 1420 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1421 return; 1422 } 1423 1424 if (!has_format) { 1425 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1426 } 1427 if (format) { 1428 drv = bdrv_find_format(format); 1429 if (!drv) { 1430 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1431 return; 1432 } 1433 } 1434 1435 if (bdrv_in_use(bs)) { 1436 error_set(errp, QERR_DEVICE_IN_USE, device); 1437 return; 1438 } 1439 1440 flags = bs->open_flags | BDRV_O_RDWR; 1441 source = bs->backing_hd; 1442 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 1443 sync = MIRROR_SYNC_MODE_FULL; 1444 } 1445 1446 proto_drv = bdrv_find_protocol(target); 1447 if (!proto_drv) { 1448 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1449 return; 1450 } 1451 1452 bdrv_get_geometry(bs, &size); 1453 size *= 512; 1454 if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) { 1455 /* create new image w/o backing file */ 1456 assert(format && drv); 1457 bdrv_img_create(target, format, 1458 NULL, NULL, NULL, size, flags, &local_err, false); 1459 } else { 1460 switch (mode) { 1461 case NEW_IMAGE_MODE_EXISTING: 1462 ret = 0; 1463 break; 1464 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 1465 /* create new image with backing file */ 1466 bdrv_img_create(target, format, 1467 source->filename, 1468 source->drv->format_name, 1469 NULL, size, flags, &local_err, false); 1470 break; 1471 default: 1472 abort(); 1473 } 1474 } 1475 1476 if (error_is_set(&local_err)) { 1477 error_propagate(errp, local_err); 1478 return; 1479 } 1480 1481 /* Mirroring takes care of copy-on-write using the source's backing 1482 * file. 1483 */ 1484 target_bs = bdrv_new(""); 1485 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv); 1486 1487 if (ret < 0) { 1488 bdrv_delete(target_bs); 1489 error_setg_file_open(errp, -ret, target); 1490 return; 1491 } 1492 1493 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 1494 on_source_error, on_target_error, 1495 block_job_cb, bs, &local_err); 1496 if (local_err != NULL) { 1497 bdrv_delete(target_bs); 1498 error_propagate(errp, local_err); 1499 return; 1500 } 1501 1502 /* Grab a reference so hotplug does not delete the BlockDriverState from 1503 * underneath us. 1504 */ 1505 drive_get_ref(drive_get_by_blockdev(bs)); 1506 } 1507 1508 static BlockJob *find_block_job(const char *device) 1509 { 1510 BlockDriverState *bs; 1511 1512 bs = bdrv_find(device); 1513 if (!bs || !bs->job) { 1514 return NULL; 1515 } 1516 return bs->job; 1517 } 1518 1519 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 1520 { 1521 BlockJob *job = find_block_job(device); 1522 1523 if (!job) { 1524 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1525 return; 1526 } 1527 1528 block_job_set_speed(job, speed, errp); 1529 } 1530 1531 void qmp_block_job_cancel(const char *device, 1532 bool has_force, bool force, Error **errp) 1533 { 1534 BlockJob *job = find_block_job(device); 1535 1536 if (!has_force) { 1537 force = false; 1538 } 1539 1540 if (!job) { 1541 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1542 return; 1543 } 1544 if (job->paused && !force) { 1545 error_set(errp, QERR_BLOCK_JOB_PAUSED, device); 1546 return; 1547 } 1548 1549 trace_qmp_block_job_cancel(job); 1550 block_job_cancel(job); 1551 } 1552 1553 void qmp_block_job_pause(const char *device, Error **errp) 1554 { 1555 BlockJob *job = find_block_job(device); 1556 1557 if (!job) { 1558 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1559 return; 1560 } 1561 1562 trace_qmp_block_job_pause(job); 1563 block_job_pause(job); 1564 } 1565 1566 void qmp_block_job_resume(const char *device, Error **errp) 1567 { 1568 BlockJob *job = find_block_job(device); 1569 1570 if (!job) { 1571 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1572 return; 1573 } 1574 1575 trace_qmp_block_job_resume(job); 1576 block_job_resume(job); 1577 } 1578 1579 void qmp_block_job_complete(const char *device, Error **errp) 1580 { 1581 BlockJob *job = find_block_job(device); 1582 1583 if (!job) { 1584 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1585 return; 1586 } 1587 1588 trace_qmp_block_job_complete(job); 1589 block_job_complete(job, errp); 1590 } 1591 1592 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 1593 { 1594 BlockJobInfoList **prev = opaque; 1595 BlockJob *job = bs->job; 1596 1597 if (job) { 1598 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 1599 elem->value = block_job_query(bs->job); 1600 (*prev)->next = elem; 1601 *prev = elem; 1602 } 1603 } 1604 1605 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 1606 { 1607 /* Dummy is a fake list element for holding the head pointer */ 1608 BlockJobInfoList dummy = {}; 1609 BlockJobInfoList *prev = &dummy; 1610 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 1611 return dummy.next; 1612 } 1613 1614 QemuOptsList qemu_common_drive_opts = { 1615 .name = "drive", 1616 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 1617 .desc = { 1618 { 1619 .name = "bus", 1620 .type = QEMU_OPT_NUMBER, 1621 .help = "bus number", 1622 },{ 1623 .name = "unit", 1624 .type = QEMU_OPT_NUMBER, 1625 .help = "unit number (i.e. lun for scsi)", 1626 },{ 1627 .name = "if", 1628 .type = QEMU_OPT_STRING, 1629 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 1630 },{ 1631 .name = "index", 1632 .type = QEMU_OPT_NUMBER, 1633 .help = "index number", 1634 },{ 1635 .name = "cyls", 1636 .type = QEMU_OPT_NUMBER, 1637 .help = "number of cylinders (ide disk geometry)", 1638 },{ 1639 .name = "heads", 1640 .type = QEMU_OPT_NUMBER, 1641 .help = "number of heads (ide disk geometry)", 1642 },{ 1643 .name = "secs", 1644 .type = QEMU_OPT_NUMBER, 1645 .help = "number of sectors (ide disk geometry)", 1646 },{ 1647 .name = "trans", 1648 .type = QEMU_OPT_STRING, 1649 .help = "chs translation (auto, lba. none)", 1650 },{ 1651 .name = "media", 1652 .type = QEMU_OPT_STRING, 1653 .help = "media type (disk, cdrom)", 1654 },{ 1655 .name = "snapshot", 1656 .type = QEMU_OPT_BOOL, 1657 .help = "enable/disable snapshot mode", 1658 },{ 1659 .name = "file", 1660 .type = QEMU_OPT_STRING, 1661 .help = "disk image", 1662 },{ 1663 .name = "discard", 1664 .type = QEMU_OPT_STRING, 1665 .help = "discard operation (ignore/off, unmap/on)", 1666 },{ 1667 .name = "cache", 1668 .type = QEMU_OPT_STRING, 1669 .help = "host cache usage (none, writeback, writethrough, " 1670 "directsync, unsafe)", 1671 },{ 1672 .name = "aio", 1673 .type = QEMU_OPT_STRING, 1674 .help = "host AIO implementation (threads, native)", 1675 },{ 1676 .name = "format", 1677 .type = QEMU_OPT_STRING, 1678 .help = "disk format (raw, qcow2, ...)", 1679 },{ 1680 .name = "serial", 1681 .type = QEMU_OPT_STRING, 1682 .help = "disk serial number", 1683 },{ 1684 .name = "rerror", 1685 .type = QEMU_OPT_STRING, 1686 .help = "read error action", 1687 },{ 1688 .name = "werror", 1689 .type = QEMU_OPT_STRING, 1690 .help = "write error action", 1691 },{ 1692 .name = "addr", 1693 .type = QEMU_OPT_STRING, 1694 .help = "pci address (virtio only)", 1695 },{ 1696 .name = "readonly", 1697 .type = QEMU_OPT_BOOL, 1698 .help = "open drive file as read-only", 1699 },{ 1700 .name = "iops", 1701 .type = QEMU_OPT_NUMBER, 1702 .help = "limit total I/O operations per second", 1703 },{ 1704 .name = "iops_rd", 1705 .type = QEMU_OPT_NUMBER, 1706 .help = "limit read operations per second", 1707 },{ 1708 .name = "iops_wr", 1709 .type = QEMU_OPT_NUMBER, 1710 .help = "limit write operations per second", 1711 },{ 1712 .name = "bps", 1713 .type = QEMU_OPT_NUMBER, 1714 .help = "limit total bytes per second", 1715 },{ 1716 .name = "bps_rd", 1717 .type = QEMU_OPT_NUMBER, 1718 .help = "limit read bytes per second", 1719 },{ 1720 .name = "bps_wr", 1721 .type = QEMU_OPT_NUMBER, 1722 .help = "limit write bytes per second", 1723 },{ 1724 .name = "copy-on-read", 1725 .type = QEMU_OPT_BOOL, 1726 .help = "copy read data from backing file into image file", 1727 },{ 1728 .name = "boot", 1729 .type = QEMU_OPT_BOOL, 1730 .help = "(deprecated, ignored)", 1731 }, 1732 { /* end of list */ } 1733 }, 1734 }; 1735 1736 QemuOptsList qemu_drive_opts = { 1737 .name = "drive", 1738 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 1739 .desc = { 1740 /* 1741 * no elements => accept any params 1742 * validation will happen later 1743 */ 1744 { /* end of list */ } 1745 }, 1746 }; 1747