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 BlkTransactionState BlkTransactionState; 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)(BlkTransactionState *common, Error **errp); 792 /* Commit the changes, can be NULL. */ 793 void (*commit)(BlkTransactionState *common); 794 /* Abort the changes on fail, can be NULL. */ 795 void (*abort)(BlkTransactionState *common); 796 /* Clean up resource in the end, can be NULL. */ 797 void (*clean)(BlkTransactionState *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 BlkTransactionState { 806 TransactionAction *action; 807 const BdrvActionOps *ops; 808 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 809 }; 810 811 /* external snapshot private data */ 812 typedef struct ExternalSnapshotState { 813 BlkTransactionState common; 814 BlockDriverState *old_bs; 815 BlockDriverState *new_bs; 816 } ExternalSnapshotState; 817 818 static void external_snapshot_prepare(BlkTransactionState *common, 819 Error **errp) 820 { 821 BlockDriver *drv; 822 int flags, ret; 823 Error *local_err = NULL; 824 const char *device; 825 const char *new_image_file; 826 const char *format = "qcow2"; 827 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 828 ExternalSnapshotState *state = 829 DO_UPCAST(ExternalSnapshotState, common, common); 830 TransactionAction *action = common->action; 831 832 /* get parameters */ 833 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 834 835 device = action->blockdev_snapshot_sync->device; 836 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 837 if (action->blockdev_snapshot_sync->has_format) { 838 format = action->blockdev_snapshot_sync->format; 839 } 840 if (action->blockdev_snapshot_sync->has_mode) { 841 mode = action->blockdev_snapshot_sync->mode; 842 } 843 844 /* start processing */ 845 drv = bdrv_find_format(format); 846 if (!drv) { 847 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 848 return; 849 } 850 851 state->old_bs = bdrv_find(device); 852 if (!state->old_bs) { 853 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 854 return; 855 } 856 857 if (!bdrv_is_inserted(state->old_bs)) { 858 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 859 return; 860 } 861 862 if (bdrv_in_use(state->old_bs)) { 863 error_set(errp, QERR_DEVICE_IN_USE, device); 864 return; 865 } 866 867 if (!bdrv_is_read_only(state->old_bs)) { 868 if (bdrv_flush(state->old_bs)) { 869 error_set(errp, QERR_IO_ERROR); 870 return; 871 } 872 } 873 874 flags = state->old_bs->open_flags; 875 876 /* create new image w/backing file */ 877 if (mode != NEW_IMAGE_MODE_EXISTING) { 878 bdrv_img_create(new_image_file, format, 879 state->old_bs->filename, 880 state->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 return; 885 } 886 } 887 888 /* We will manually add the backing_hd field to the bs later */ 889 state->new_bs = bdrv_new(""); 890 /* TODO Inherit bs->options or only take explicit options with an 891 * extended QMP command? */ 892 ret = bdrv_open(state->new_bs, new_image_file, NULL, 893 flags | BDRV_O_NO_BACKING, drv); 894 if (ret != 0) { 895 error_setg_file_open(errp, -ret, new_image_file); 896 } 897 } 898 899 static void external_snapshot_commit(BlkTransactionState *common) 900 { 901 ExternalSnapshotState *state = 902 DO_UPCAST(ExternalSnapshotState, common, common); 903 904 /* This removes our old bs and adds the new bs */ 905 bdrv_append(state->new_bs, state->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(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 910 NULL); 911 } 912 913 static void external_snapshot_abort(BlkTransactionState *common) 914 { 915 ExternalSnapshotState *state = 916 DO_UPCAST(ExternalSnapshotState, common, common); 917 if (state->new_bs) { 918 bdrv_delete(state->new_bs); 919 } 920 } 921 922 typedef struct DriveBackupState { 923 BlkTransactionState common; 924 BlockDriverState *bs; 925 BlockJob *job; 926 } DriveBackupState; 927 928 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 929 { 930 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 931 DriveBackup *backup; 932 Error *local_err = NULL; 933 934 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 935 backup = common->action->drive_backup; 936 937 qmp_drive_backup(backup->device, backup->target, 938 backup->has_format, backup->format, 939 backup->has_mode, backup->mode, 940 backup->has_speed, backup->speed, 941 backup->has_on_source_error, backup->on_source_error, 942 backup->has_on_target_error, backup->on_target_error, 943 &local_err); 944 if (error_is_set(&local_err)) { 945 error_propagate(errp, local_err); 946 state->bs = NULL; 947 state->job = NULL; 948 return; 949 } 950 951 state->bs = bdrv_find(backup->device); 952 state->job = state->bs->job; 953 } 954 955 static void drive_backup_abort(BlkTransactionState *common) 956 { 957 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 958 BlockDriverState *bs = state->bs; 959 960 /* Only cancel if it's the job we started */ 961 if (bs && bs->job && bs->job == state->job) { 962 block_job_cancel_sync(bs->job); 963 } 964 } 965 966 static void abort_prepare(BlkTransactionState *common, Error **errp) 967 { 968 error_setg(errp, "Transaction aborted using Abort action"); 969 } 970 971 static void abort_commit(BlkTransactionState *common) 972 { 973 assert(false); /* this action never succeeds */ 974 } 975 976 static const BdrvActionOps actions[] = { 977 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 978 .instance_size = sizeof(ExternalSnapshotState), 979 .prepare = external_snapshot_prepare, 980 .commit = external_snapshot_commit, 981 .abort = external_snapshot_abort, 982 }, 983 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 984 .instance_size = sizeof(DriveBackupState), 985 .prepare = drive_backup_prepare, 986 .abort = drive_backup_abort, 987 }, 988 [TRANSACTION_ACTION_KIND_ABORT] = { 989 .instance_size = sizeof(BlkTransactionState), 990 .prepare = abort_prepare, 991 .commit = abort_commit, 992 }, 993 }; 994 995 /* 996 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 997 * then we do not pivot any of the devices in the group, and abandon the 998 * snapshots 999 */ 1000 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1001 { 1002 TransactionActionList *dev_entry = dev_list; 1003 BlkTransactionState *state, *next; 1004 Error *local_err = NULL; 1005 1006 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1007 QSIMPLEQ_INIT(&snap_bdrv_states); 1008 1009 /* drain all i/o before any snapshots */ 1010 bdrv_drain_all(); 1011 1012 /* We don't do anything in this loop that commits us to the snapshot */ 1013 while (NULL != dev_entry) { 1014 TransactionAction *dev_info = NULL; 1015 const BdrvActionOps *ops; 1016 1017 dev_info = dev_entry->value; 1018 dev_entry = dev_entry->next; 1019 1020 assert(dev_info->kind < ARRAY_SIZE(actions)); 1021 1022 ops = &actions[dev_info->kind]; 1023 state = g_malloc0(ops->instance_size); 1024 state->ops = ops; 1025 state->action = dev_info; 1026 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1027 1028 state->ops->prepare(state, &local_err); 1029 if (error_is_set(&local_err)) { 1030 error_propagate(errp, local_err); 1031 goto delete_and_fail; 1032 } 1033 } 1034 1035 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1036 if (state->ops->commit) { 1037 state->ops->commit(state); 1038 } 1039 } 1040 1041 /* success */ 1042 goto exit; 1043 1044 delete_and_fail: 1045 /* 1046 * failure, and it is all-or-none; abandon each new bs, and keep using 1047 * the original bs for all images 1048 */ 1049 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1050 if (state->ops->abort) { 1051 state->ops->abort(state); 1052 } 1053 } 1054 exit: 1055 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1056 if (state->ops->clean) { 1057 state->ops->clean(state); 1058 } 1059 g_free(state); 1060 } 1061 } 1062 1063 1064 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1065 { 1066 if (bdrv_in_use(bs)) { 1067 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1068 return; 1069 } 1070 if (!bdrv_dev_has_removable_media(bs)) { 1071 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 1072 return; 1073 } 1074 1075 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1076 bdrv_dev_eject_request(bs, force); 1077 if (!force) { 1078 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 1079 return; 1080 } 1081 } 1082 1083 bdrv_close(bs); 1084 } 1085 1086 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1087 { 1088 BlockDriverState *bs; 1089 1090 bs = bdrv_find(device); 1091 if (!bs) { 1092 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1093 return; 1094 } 1095 1096 eject_device(bs, force, errp); 1097 } 1098 1099 void qmp_block_passwd(const char *device, const char *password, Error **errp) 1100 { 1101 BlockDriverState *bs; 1102 int err; 1103 1104 bs = bdrv_find(device); 1105 if (!bs) { 1106 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1107 return; 1108 } 1109 1110 err = bdrv_set_key(bs, password); 1111 if (err == -EINVAL) { 1112 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1113 return; 1114 } else if (err < 0) { 1115 error_set(errp, QERR_INVALID_PASSWORD); 1116 return; 1117 } 1118 } 1119 1120 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1121 int bdrv_flags, BlockDriver *drv, 1122 const char *password, Error **errp) 1123 { 1124 int ret; 1125 1126 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv); 1127 if (ret < 0) { 1128 error_setg_file_open(errp, -ret, filename); 1129 return; 1130 } 1131 1132 if (bdrv_key_required(bs)) { 1133 if (password) { 1134 if (bdrv_set_key(bs, password) < 0) { 1135 error_set(errp, QERR_INVALID_PASSWORD); 1136 } 1137 } else { 1138 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1139 bdrv_get_encrypted_filename(bs)); 1140 } 1141 } else if (password) { 1142 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1143 } 1144 } 1145 1146 void qmp_change_blockdev(const char *device, const char *filename, 1147 bool has_format, const char *format, Error **errp) 1148 { 1149 BlockDriverState *bs; 1150 BlockDriver *drv = NULL; 1151 int bdrv_flags; 1152 Error *err = NULL; 1153 1154 bs = bdrv_find(device); 1155 if (!bs) { 1156 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1157 return; 1158 } 1159 1160 if (format) { 1161 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1162 if (!drv) { 1163 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1164 return; 1165 } 1166 } 1167 1168 eject_device(bs, 0, &err); 1169 if (error_is_set(&err)) { 1170 error_propagate(errp, err); 1171 return; 1172 } 1173 1174 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1175 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1176 1177 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1178 } 1179 1180 /* throttling disk I/O limits */ 1181 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1182 int64_t bps_wr, int64_t iops, int64_t iops_rd, 1183 int64_t iops_wr, Error **errp) 1184 { 1185 BlockIOLimit io_limits; 1186 BlockDriverState *bs; 1187 1188 bs = bdrv_find(device); 1189 if (!bs) { 1190 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1191 return; 1192 } 1193 1194 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; 1195 io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; 1196 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; 1197 io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; 1198 io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; 1199 io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; 1200 1201 if (!do_check_io_limits(&io_limits, errp)) { 1202 return; 1203 } 1204 1205 bs->io_limits = io_limits; 1206 1207 if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) { 1208 bdrv_io_limits_enable(bs); 1209 } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { 1210 bdrv_io_limits_disable(bs); 1211 } else { 1212 if (bs->block_timer) { 1213 qemu_mod_timer(bs->block_timer, qemu_get_clock_ns(vm_clock)); 1214 } 1215 } 1216 } 1217 1218 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1219 { 1220 const char *id = qdict_get_str(qdict, "id"); 1221 BlockDriverState *bs; 1222 1223 bs = bdrv_find(id); 1224 if (!bs) { 1225 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1226 return -1; 1227 } 1228 if (bdrv_in_use(bs)) { 1229 qerror_report(QERR_DEVICE_IN_USE, id); 1230 return -1; 1231 } 1232 1233 /* quiesce block driver; prevent further io */ 1234 bdrv_drain_all(); 1235 bdrv_flush(bs); 1236 bdrv_close(bs); 1237 1238 /* if we have a device attached to this BlockDriverState 1239 * then we need to make the drive anonymous until the device 1240 * can be removed. If this is a drive with no device backing 1241 * then we can just get rid of the block driver state right here. 1242 */ 1243 if (bdrv_get_attached_dev(bs)) { 1244 bdrv_make_anon(bs); 1245 1246 /* Further I/O must not pause the guest */ 1247 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1248 BLOCKDEV_ON_ERROR_REPORT); 1249 } else { 1250 drive_uninit(drive_get_by_blockdev(bs)); 1251 } 1252 1253 return 0; 1254 } 1255 1256 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1257 { 1258 BlockDriverState *bs; 1259 int ret; 1260 1261 bs = bdrv_find(device); 1262 if (!bs) { 1263 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1264 return; 1265 } 1266 1267 if (size < 0) { 1268 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1269 return; 1270 } 1271 1272 /* complete all in-flight operations before resizing the device */ 1273 bdrv_drain_all(); 1274 1275 ret = bdrv_truncate(bs, size); 1276 switch (ret) { 1277 case 0: 1278 break; 1279 case -ENOMEDIUM: 1280 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1281 break; 1282 case -ENOTSUP: 1283 error_set(errp, QERR_UNSUPPORTED); 1284 break; 1285 case -EACCES: 1286 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1287 break; 1288 case -EBUSY: 1289 error_set(errp, QERR_DEVICE_IN_USE, device); 1290 break; 1291 default: 1292 error_setg_errno(errp, -ret, "Could not resize"); 1293 break; 1294 } 1295 } 1296 1297 static void block_job_cb(void *opaque, int ret) 1298 { 1299 BlockDriverState *bs = opaque; 1300 QObject *obj; 1301 1302 trace_block_job_cb(bs, bs->job, ret); 1303 1304 assert(bs->job); 1305 obj = qobject_from_block_job(bs->job); 1306 if (ret < 0) { 1307 QDict *dict = qobject_to_qdict(obj); 1308 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1309 } 1310 1311 if (block_job_is_cancelled(bs->job)) { 1312 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1313 } else { 1314 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1315 } 1316 qobject_decref(obj); 1317 1318 drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); 1319 } 1320 1321 void qmp_block_stream(const char *device, bool has_base, 1322 const char *base, bool has_speed, int64_t speed, 1323 bool has_on_error, BlockdevOnError on_error, 1324 Error **errp) 1325 { 1326 BlockDriverState *bs; 1327 BlockDriverState *base_bs = NULL; 1328 Error *local_err = NULL; 1329 1330 if (!has_on_error) { 1331 on_error = BLOCKDEV_ON_ERROR_REPORT; 1332 } 1333 1334 bs = bdrv_find(device); 1335 if (!bs) { 1336 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1337 return; 1338 } 1339 1340 if (base) { 1341 base_bs = bdrv_find_backing_image(bs, base); 1342 if (base_bs == NULL) { 1343 error_set(errp, QERR_BASE_NOT_FOUND, base); 1344 return; 1345 } 1346 } 1347 1348 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1349 on_error, block_job_cb, bs, &local_err); 1350 if (error_is_set(&local_err)) { 1351 error_propagate(errp, local_err); 1352 return; 1353 } 1354 1355 /* Grab a reference so hotplug does not delete the BlockDriverState from 1356 * underneath us. 1357 */ 1358 drive_get_ref(drive_get_by_blockdev(bs)); 1359 1360 trace_qmp_block_stream(bs, bs->job); 1361 } 1362 1363 void qmp_block_commit(const char *device, 1364 bool has_base, const char *base, const char *top, 1365 bool has_speed, int64_t speed, 1366 Error **errp) 1367 { 1368 BlockDriverState *bs; 1369 BlockDriverState *base_bs, *top_bs; 1370 Error *local_err = NULL; 1371 /* This will be part of the QMP command, if/when the 1372 * BlockdevOnError change for blkmirror makes it in 1373 */ 1374 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1375 1376 /* drain all i/o before commits */ 1377 bdrv_drain_all(); 1378 1379 bs = bdrv_find(device); 1380 if (!bs) { 1381 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1382 return; 1383 } 1384 1385 /* default top_bs is the active layer */ 1386 top_bs = bs; 1387 1388 if (top) { 1389 if (strcmp(bs->filename, top) != 0) { 1390 top_bs = bdrv_find_backing_image(bs, top); 1391 } 1392 } 1393 1394 if (top_bs == NULL) { 1395 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1396 return; 1397 } 1398 1399 if (has_base && base) { 1400 base_bs = bdrv_find_backing_image(top_bs, base); 1401 } else { 1402 base_bs = bdrv_find_base(top_bs); 1403 } 1404 1405 if (base_bs == NULL) { 1406 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1407 return; 1408 } 1409 1410 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1411 &local_err); 1412 if (local_err != NULL) { 1413 error_propagate(errp, local_err); 1414 return; 1415 } 1416 /* Grab a reference so hotplug does not delete the BlockDriverState from 1417 * underneath us. 1418 */ 1419 drive_get_ref(drive_get_by_blockdev(bs)); 1420 } 1421 1422 void qmp_drive_backup(const char *device, const char *target, 1423 bool has_format, const char *format, 1424 bool has_mode, enum NewImageMode mode, 1425 bool has_speed, int64_t speed, 1426 bool has_on_source_error, BlockdevOnError on_source_error, 1427 bool has_on_target_error, BlockdevOnError on_target_error, 1428 Error **errp) 1429 { 1430 BlockDriverState *bs; 1431 BlockDriverState *target_bs; 1432 BlockDriver *drv = NULL; 1433 Error *local_err = NULL; 1434 int flags; 1435 int64_t size; 1436 int ret; 1437 1438 if (!has_speed) { 1439 speed = 0; 1440 } 1441 if (!has_on_source_error) { 1442 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1443 } 1444 if (!has_on_target_error) { 1445 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1446 } 1447 if (!has_mode) { 1448 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1449 } 1450 1451 bs = bdrv_find(device); 1452 if (!bs) { 1453 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1454 return; 1455 } 1456 1457 if (!bdrv_is_inserted(bs)) { 1458 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1459 return; 1460 } 1461 1462 if (!has_format) { 1463 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1464 } 1465 if (format) { 1466 drv = bdrv_find_format(format); 1467 if (!drv) { 1468 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1469 return; 1470 } 1471 } 1472 1473 if (bdrv_in_use(bs)) { 1474 error_set(errp, QERR_DEVICE_IN_USE, device); 1475 return; 1476 } 1477 1478 flags = bs->open_flags | BDRV_O_RDWR; 1479 1480 size = bdrv_getlength(bs); 1481 if (size < 0) { 1482 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1483 return; 1484 } 1485 1486 if (mode != NEW_IMAGE_MODE_EXISTING) { 1487 assert(format && drv); 1488 bdrv_img_create(target, format, 1489 NULL, NULL, NULL, size, flags, &local_err, false); 1490 } 1491 1492 if (error_is_set(&local_err)) { 1493 error_propagate(errp, local_err); 1494 return; 1495 } 1496 1497 target_bs = bdrv_new(""); 1498 ret = bdrv_open(target_bs, target, NULL, flags, drv); 1499 if (ret < 0) { 1500 bdrv_delete(target_bs); 1501 error_setg_file_open(errp, -ret, target); 1502 return; 1503 } 1504 1505 backup_start(bs, target_bs, speed, on_source_error, on_target_error, 1506 block_job_cb, bs, &local_err); 1507 if (local_err != NULL) { 1508 bdrv_delete(target_bs); 1509 error_propagate(errp, local_err); 1510 return; 1511 } 1512 1513 /* Grab a reference so hotplug does not delete the BlockDriverState from 1514 * underneath us. 1515 */ 1516 drive_get_ref(drive_get_by_blockdev(bs)); 1517 } 1518 1519 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 1520 1521 void qmp_drive_mirror(const char *device, const char *target, 1522 bool has_format, const char *format, 1523 enum MirrorSyncMode sync, 1524 bool has_mode, enum NewImageMode mode, 1525 bool has_speed, int64_t speed, 1526 bool has_granularity, uint32_t granularity, 1527 bool has_buf_size, int64_t buf_size, 1528 bool has_on_source_error, BlockdevOnError on_source_error, 1529 bool has_on_target_error, BlockdevOnError on_target_error, 1530 Error **errp) 1531 { 1532 BlockDriverState *bs; 1533 BlockDriverState *source, *target_bs; 1534 BlockDriver *drv = NULL; 1535 Error *local_err = NULL; 1536 int flags; 1537 int64_t size; 1538 int ret; 1539 1540 if (!has_speed) { 1541 speed = 0; 1542 } 1543 if (!has_on_source_error) { 1544 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1545 } 1546 if (!has_on_target_error) { 1547 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1548 } 1549 if (!has_mode) { 1550 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1551 } 1552 if (!has_granularity) { 1553 granularity = 0; 1554 } 1555 if (!has_buf_size) { 1556 buf_size = DEFAULT_MIRROR_BUF_SIZE; 1557 } 1558 1559 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 1560 error_set(errp, QERR_INVALID_PARAMETER, device); 1561 return; 1562 } 1563 if (granularity & (granularity - 1)) { 1564 error_set(errp, QERR_INVALID_PARAMETER, device); 1565 return; 1566 } 1567 1568 bs = bdrv_find(device); 1569 if (!bs) { 1570 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1571 return; 1572 } 1573 1574 if (!bdrv_is_inserted(bs)) { 1575 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1576 return; 1577 } 1578 1579 if (!has_format) { 1580 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1581 } 1582 if (format) { 1583 drv = bdrv_find_format(format); 1584 if (!drv) { 1585 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1586 return; 1587 } 1588 } 1589 1590 if (bdrv_in_use(bs)) { 1591 error_set(errp, QERR_DEVICE_IN_USE, device); 1592 return; 1593 } 1594 1595 flags = bs->open_flags | BDRV_O_RDWR; 1596 source = bs->backing_hd; 1597 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 1598 sync = MIRROR_SYNC_MODE_FULL; 1599 } 1600 1601 size = bdrv_getlength(bs); 1602 if (size < 0) { 1603 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1604 return; 1605 } 1606 1607 if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) { 1608 /* create new image w/o backing file */ 1609 assert(format && drv); 1610 bdrv_img_create(target, format, 1611 NULL, NULL, NULL, size, flags, &local_err, false); 1612 } else { 1613 switch (mode) { 1614 case NEW_IMAGE_MODE_EXISTING: 1615 ret = 0; 1616 break; 1617 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 1618 /* create new image with backing file */ 1619 bdrv_img_create(target, format, 1620 source->filename, 1621 source->drv->format_name, 1622 NULL, size, flags, &local_err, false); 1623 break; 1624 default: 1625 abort(); 1626 } 1627 } 1628 1629 if (error_is_set(&local_err)) { 1630 error_propagate(errp, local_err); 1631 return; 1632 } 1633 1634 /* Mirroring takes care of copy-on-write using the source's backing 1635 * file. 1636 */ 1637 target_bs = bdrv_new(""); 1638 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv); 1639 if (ret < 0) { 1640 bdrv_delete(target_bs); 1641 error_setg_file_open(errp, -ret, target); 1642 return; 1643 } 1644 1645 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 1646 on_source_error, on_target_error, 1647 block_job_cb, bs, &local_err); 1648 if (local_err != NULL) { 1649 bdrv_delete(target_bs); 1650 error_propagate(errp, local_err); 1651 return; 1652 } 1653 1654 /* Grab a reference so hotplug does not delete the BlockDriverState from 1655 * underneath us. 1656 */ 1657 drive_get_ref(drive_get_by_blockdev(bs)); 1658 } 1659 1660 static BlockJob *find_block_job(const char *device) 1661 { 1662 BlockDriverState *bs; 1663 1664 bs = bdrv_find(device); 1665 if (!bs || !bs->job) { 1666 return NULL; 1667 } 1668 return bs->job; 1669 } 1670 1671 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 1672 { 1673 BlockJob *job = find_block_job(device); 1674 1675 if (!job) { 1676 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1677 return; 1678 } 1679 1680 block_job_set_speed(job, speed, errp); 1681 } 1682 1683 void qmp_block_job_cancel(const char *device, 1684 bool has_force, bool force, Error **errp) 1685 { 1686 BlockJob *job = find_block_job(device); 1687 1688 if (!has_force) { 1689 force = false; 1690 } 1691 1692 if (!job) { 1693 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1694 return; 1695 } 1696 if (job->paused && !force) { 1697 error_set(errp, QERR_BLOCK_JOB_PAUSED, device); 1698 return; 1699 } 1700 1701 trace_qmp_block_job_cancel(job); 1702 block_job_cancel(job); 1703 } 1704 1705 void qmp_block_job_pause(const char *device, Error **errp) 1706 { 1707 BlockJob *job = find_block_job(device); 1708 1709 if (!job) { 1710 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1711 return; 1712 } 1713 1714 trace_qmp_block_job_pause(job); 1715 block_job_pause(job); 1716 } 1717 1718 void qmp_block_job_resume(const char *device, Error **errp) 1719 { 1720 BlockJob *job = find_block_job(device); 1721 1722 if (!job) { 1723 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1724 return; 1725 } 1726 1727 trace_qmp_block_job_resume(job); 1728 block_job_resume(job); 1729 } 1730 1731 void qmp_block_job_complete(const char *device, Error **errp) 1732 { 1733 BlockJob *job = find_block_job(device); 1734 1735 if (!job) { 1736 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1737 return; 1738 } 1739 1740 trace_qmp_block_job_complete(job); 1741 block_job_complete(job, errp); 1742 } 1743 1744 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 1745 { 1746 BlockJobInfoList **prev = opaque; 1747 BlockJob *job = bs->job; 1748 1749 if (job) { 1750 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 1751 elem->value = block_job_query(bs->job); 1752 (*prev)->next = elem; 1753 *prev = elem; 1754 } 1755 } 1756 1757 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 1758 { 1759 /* Dummy is a fake list element for holding the head pointer */ 1760 BlockJobInfoList dummy = {}; 1761 BlockJobInfoList *prev = &dummy; 1762 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 1763 return dummy.next; 1764 } 1765 1766 QemuOptsList qemu_common_drive_opts = { 1767 .name = "drive", 1768 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 1769 .desc = { 1770 { 1771 .name = "bus", 1772 .type = QEMU_OPT_NUMBER, 1773 .help = "bus number", 1774 },{ 1775 .name = "unit", 1776 .type = QEMU_OPT_NUMBER, 1777 .help = "unit number (i.e. lun for scsi)", 1778 },{ 1779 .name = "if", 1780 .type = QEMU_OPT_STRING, 1781 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 1782 },{ 1783 .name = "index", 1784 .type = QEMU_OPT_NUMBER, 1785 .help = "index number", 1786 },{ 1787 .name = "cyls", 1788 .type = QEMU_OPT_NUMBER, 1789 .help = "number of cylinders (ide disk geometry)", 1790 },{ 1791 .name = "heads", 1792 .type = QEMU_OPT_NUMBER, 1793 .help = "number of heads (ide disk geometry)", 1794 },{ 1795 .name = "secs", 1796 .type = QEMU_OPT_NUMBER, 1797 .help = "number of sectors (ide disk geometry)", 1798 },{ 1799 .name = "trans", 1800 .type = QEMU_OPT_STRING, 1801 .help = "chs translation (auto, lba. none)", 1802 },{ 1803 .name = "media", 1804 .type = QEMU_OPT_STRING, 1805 .help = "media type (disk, cdrom)", 1806 },{ 1807 .name = "snapshot", 1808 .type = QEMU_OPT_BOOL, 1809 .help = "enable/disable snapshot mode", 1810 },{ 1811 .name = "file", 1812 .type = QEMU_OPT_STRING, 1813 .help = "disk image", 1814 },{ 1815 .name = "discard", 1816 .type = QEMU_OPT_STRING, 1817 .help = "discard operation (ignore/off, unmap/on)", 1818 },{ 1819 .name = "cache", 1820 .type = QEMU_OPT_STRING, 1821 .help = "host cache usage (none, writeback, writethrough, " 1822 "directsync, unsafe)", 1823 },{ 1824 .name = "aio", 1825 .type = QEMU_OPT_STRING, 1826 .help = "host AIO implementation (threads, native)", 1827 },{ 1828 .name = "format", 1829 .type = QEMU_OPT_STRING, 1830 .help = "disk format (raw, qcow2, ...)", 1831 },{ 1832 .name = "serial", 1833 .type = QEMU_OPT_STRING, 1834 .help = "disk serial number", 1835 },{ 1836 .name = "rerror", 1837 .type = QEMU_OPT_STRING, 1838 .help = "read error action", 1839 },{ 1840 .name = "werror", 1841 .type = QEMU_OPT_STRING, 1842 .help = "write error action", 1843 },{ 1844 .name = "addr", 1845 .type = QEMU_OPT_STRING, 1846 .help = "pci address (virtio only)", 1847 },{ 1848 .name = "readonly", 1849 .type = QEMU_OPT_BOOL, 1850 .help = "open drive file as read-only", 1851 },{ 1852 .name = "iops", 1853 .type = QEMU_OPT_NUMBER, 1854 .help = "limit total I/O operations per second", 1855 },{ 1856 .name = "iops_rd", 1857 .type = QEMU_OPT_NUMBER, 1858 .help = "limit read operations per second", 1859 },{ 1860 .name = "iops_wr", 1861 .type = QEMU_OPT_NUMBER, 1862 .help = "limit write operations per second", 1863 },{ 1864 .name = "bps", 1865 .type = QEMU_OPT_NUMBER, 1866 .help = "limit total bytes per second", 1867 },{ 1868 .name = "bps_rd", 1869 .type = QEMU_OPT_NUMBER, 1870 .help = "limit read bytes per second", 1871 },{ 1872 .name = "bps_wr", 1873 .type = QEMU_OPT_NUMBER, 1874 .help = "limit write bytes per second", 1875 },{ 1876 .name = "copy-on-read", 1877 .type = QEMU_OPT_BOOL, 1878 .help = "copy read data from backing file into image file", 1879 },{ 1880 .name = "boot", 1881 .type = QEMU_OPT_BOOL, 1882 .help = "(deprecated, ignored)", 1883 }, 1884 { /* end of list */ } 1885 }, 1886 }; 1887 1888 QemuOptsList qemu_drive_opts = { 1889 .name = "drive", 1890 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 1891 .desc = { 1892 /* 1893 * no elements => accept any params 1894 * validation will happen later 1895 */ 1896 { /* end of list */ } 1897 }, 1898 }; 1899