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 static DriveInfo *blockdev_init(QemuOpts *all_opts, 316 BlockInterfaceType block_default_type) 317 { 318 const char *buf; 319 const char *file = NULL; 320 const char *serial; 321 const char *mediastr = ""; 322 BlockInterfaceType type; 323 enum { MEDIA_DISK, MEDIA_CDROM } media; 324 int bus_id, unit_id; 325 int cyls, heads, secs, translation; 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 bool has_driver_specific_opts; 342 BlockDriver *drv = NULL; 343 344 translation = BIOS_ATA_TRANSLATION_AUTO; 345 media = MEDIA_DISK; 346 347 /* Check common options by copying from all_opts to opts, all other options 348 * are stored in bs_opts. */ 349 id = qemu_opts_id(all_opts); 350 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 351 if (error_is_set(&error)) { 352 qerror_report_err(error); 353 error_free(error); 354 return NULL; 355 } 356 357 bs_opts = qdict_new(); 358 qemu_opts_to_qdict(all_opts, bs_opts); 359 qemu_opts_absorb_qdict(opts, bs_opts, &error); 360 if (error_is_set(&error)) { 361 qerror_report_err(error); 362 error_free(error); 363 return NULL; 364 } 365 366 if (id) { 367 qdict_del(bs_opts, "id"); 368 } 369 370 has_driver_specific_opts = !!qdict_size(bs_opts); 371 372 /* extract parameters */ 373 bus_id = qemu_opt_get_number(opts, "bus", 0); 374 unit_id = qemu_opt_get_number(opts, "unit", -1); 375 index = qemu_opt_get_number(opts, "index", -1); 376 377 cyls = qemu_opt_get_number(opts, "cyls", 0); 378 heads = qemu_opt_get_number(opts, "heads", 0); 379 secs = qemu_opt_get_number(opts, "secs", 0); 380 381 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 382 ro = qemu_opt_get_bool(opts, "read-only", 0); 383 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 384 385 file = qemu_opt_get(opts, "file"); 386 serial = qemu_opt_get(opts, "serial"); 387 388 if ((buf = qemu_opt_get(opts, "if")) != NULL) { 389 for (type = 0; type < IF_COUNT && strcmp(buf, if_name[type]); type++) 390 ; 391 if (type == IF_COUNT) { 392 error_report("unsupported bus type '%s'", buf); 393 return NULL; 394 } 395 } else { 396 type = block_default_type; 397 } 398 399 max_devs = if_max_devs[type]; 400 401 if (cyls || heads || secs) { 402 if (cyls < 1) { 403 error_report("invalid physical cyls number"); 404 return NULL; 405 } 406 if (heads < 1) { 407 error_report("invalid physical heads number"); 408 return NULL; 409 } 410 if (secs < 1) { 411 error_report("invalid physical secs number"); 412 return NULL; 413 } 414 } 415 416 if ((buf = qemu_opt_get(opts, "trans")) != NULL) { 417 if (!cyls) { 418 error_report("'%s' trans must be used with cyls, heads and secs", 419 buf); 420 return NULL; 421 } 422 if (!strcmp(buf, "none")) 423 translation = BIOS_ATA_TRANSLATION_NONE; 424 else if (!strcmp(buf, "lba")) 425 translation = BIOS_ATA_TRANSLATION_LBA; 426 else if (!strcmp(buf, "auto")) 427 translation = BIOS_ATA_TRANSLATION_AUTO; 428 else { 429 error_report("'%s' invalid translation type", buf); 430 return NULL; 431 } 432 } 433 434 if ((buf = qemu_opt_get(opts, "media")) != NULL) { 435 if (!strcmp(buf, "disk")) { 436 media = MEDIA_DISK; 437 } else if (!strcmp(buf, "cdrom")) { 438 if (cyls || secs || heads) { 439 error_report("CHS can't be set with media=%s", buf); 440 return NULL; 441 } 442 media = MEDIA_CDROM; 443 } else { 444 error_report("'%s' invalid media", buf); 445 return NULL; 446 } 447 } 448 449 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 450 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 451 error_report("invalid discard option"); 452 return NULL; 453 } 454 } 455 456 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 457 bdrv_flags |= BDRV_O_CACHE_WB; 458 } 459 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 460 bdrv_flags |= BDRV_O_NOCACHE; 461 } 462 if (qemu_opt_get_bool(opts, "cache.no-flush", true)) { 463 bdrv_flags |= BDRV_O_NO_FLUSH; 464 } 465 466 #ifdef CONFIG_LINUX_AIO 467 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 468 if (!strcmp(buf, "native")) { 469 bdrv_flags |= BDRV_O_NATIVE_AIO; 470 } else if (!strcmp(buf, "threads")) { 471 /* this is the default */ 472 } else { 473 error_report("invalid aio option"); 474 return NULL; 475 } 476 } 477 #endif 478 479 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 480 if (is_help_option(buf)) { 481 error_printf("Supported formats:"); 482 bdrv_iterate_format(bdrv_format_print, NULL); 483 error_printf("\n"); 484 return NULL; 485 } 486 487 drv = bdrv_find_whitelisted_format(buf, ro); 488 if (!drv) { 489 if (!ro && bdrv_find_whitelisted_format(buf, !ro)) { 490 error_report("'%s' can be only used as read-only device.", buf); 491 } else { 492 error_report("'%s' invalid format", buf); 493 } 494 return NULL; 495 } 496 } 497 498 /* disk I/O throttling */ 499 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = 500 qemu_opt_get_number(opts, "throttling.bps-total", 0); 501 io_limits.bps[BLOCK_IO_LIMIT_READ] = 502 qemu_opt_get_number(opts, "throttling.bps-read", 0); 503 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = 504 qemu_opt_get_number(opts, "throttling.bps-write", 0); 505 io_limits.iops[BLOCK_IO_LIMIT_TOTAL] = 506 qemu_opt_get_number(opts, "throttling.iops-total", 0); 507 io_limits.iops[BLOCK_IO_LIMIT_READ] = 508 qemu_opt_get_number(opts, "throttling.iops-read", 0); 509 io_limits.iops[BLOCK_IO_LIMIT_WRITE] = 510 qemu_opt_get_number(opts, "throttling.iops-write", 0); 511 512 if (!do_check_io_limits(&io_limits, &error)) { 513 error_report("%s", error_get_pretty(error)); 514 error_free(error); 515 return NULL; 516 } 517 518 if (qemu_opt_get(opts, "boot") != NULL) { 519 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 520 "ignored. Future versions will reject this parameter. Please " 521 "update your scripts.\n"); 522 } 523 524 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 525 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 526 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 527 error_report("werror is not supported by this bus type"); 528 return NULL; 529 } 530 531 on_write_error = parse_block_error_action(buf, 0); 532 if (on_write_error < 0) { 533 return NULL; 534 } 535 } 536 537 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 538 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 539 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 540 error_report("rerror is not supported by this bus type"); 541 return NULL; 542 } 543 544 on_read_error = parse_block_error_action(buf, 1); 545 if (on_read_error < 0) { 546 return NULL; 547 } 548 } 549 550 if ((devaddr = qemu_opt_get(opts, "addr")) != NULL) { 551 if (type != IF_VIRTIO) { 552 error_report("addr is not supported by this bus type"); 553 return NULL; 554 } 555 } 556 557 /* compute bus and unit according index */ 558 559 if (index != -1) { 560 if (bus_id != 0 || unit_id != -1) { 561 error_report("index cannot be used with bus and unit"); 562 return NULL; 563 } 564 bus_id = drive_index_to_bus_id(type, index); 565 unit_id = drive_index_to_unit_id(type, index); 566 } 567 568 /* if user doesn't specify a unit_id, 569 * try to find the first free 570 */ 571 572 if (unit_id == -1) { 573 unit_id = 0; 574 while (drive_get(type, bus_id, unit_id) != NULL) { 575 unit_id++; 576 if (max_devs && unit_id >= max_devs) { 577 unit_id -= max_devs; 578 bus_id++; 579 } 580 } 581 } 582 583 /* check unit id */ 584 585 if (max_devs && unit_id >= max_devs) { 586 error_report("unit %d too big (max is %d)", 587 unit_id, max_devs - 1); 588 return NULL; 589 } 590 591 /* 592 * catch multiple definitions 593 */ 594 595 if (drive_get(type, bus_id, unit_id) != NULL) { 596 error_report("drive with bus=%d, unit=%d (index=%d) exists", 597 bus_id, unit_id, index); 598 return NULL; 599 } 600 601 /* init */ 602 603 dinfo = g_malloc0(sizeof(*dinfo)); 604 if ((buf = qemu_opts_id(opts)) != NULL) { 605 dinfo->id = g_strdup(buf); 606 } else { 607 /* no id supplied -> create one */ 608 dinfo->id = g_malloc0(32); 609 if (type == IF_IDE || type == IF_SCSI) 610 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 611 if (max_devs) 612 snprintf(dinfo->id, 32, "%s%i%s%i", 613 if_name[type], bus_id, mediastr, unit_id); 614 else 615 snprintf(dinfo->id, 32, "%s%s%i", 616 if_name[type], mediastr, unit_id); 617 } 618 dinfo->bdrv = bdrv_new(dinfo->id); 619 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 620 dinfo->bdrv->read_only = ro; 621 dinfo->devaddr = devaddr; 622 dinfo->type = type; 623 dinfo->bus = bus_id; 624 dinfo->unit = unit_id; 625 dinfo->cyls = cyls; 626 dinfo->heads = heads; 627 dinfo->secs = secs; 628 dinfo->trans = translation; 629 dinfo->opts = all_opts; 630 dinfo->refcount = 1; 631 if (serial != NULL) { 632 dinfo->serial = g_strdup(serial); 633 } 634 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 635 636 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 637 638 /* disk I/O throttling */ 639 bdrv_set_io_limits(dinfo->bdrv, &io_limits); 640 641 switch(type) { 642 case IF_IDE: 643 case IF_SCSI: 644 case IF_XEN: 645 case IF_NONE: 646 dinfo->media_cd = media == MEDIA_CDROM; 647 break; 648 case IF_SD: 649 case IF_FLOPPY: 650 case IF_PFLASH: 651 case IF_MTD: 652 break; 653 case IF_VIRTIO: 654 { 655 /* add virtio block device */ 656 QemuOpts *devopts; 657 devopts = qemu_opts_create_nofail(qemu_find_opts("device")); 658 if (arch_type == QEMU_ARCH_S390X) { 659 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 660 } else { 661 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 662 } 663 qemu_opt_set(devopts, "drive", dinfo->id); 664 if (devaddr) 665 qemu_opt_set(devopts, "addr", devaddr); 666 break; 667 } 668 default: 669 abort(); 670 } 671 if (!file || !*file) { 672 if (has_driver_specific_opts) { 673 file = NULL; 674 } else { 675 return dinfo; 676 } 677 } 678 if (snapshot) { 679 /* always use cache=unsafe with snapshot */ 680 bdrv_flags &= ~BDRV_O_CACHE_MASK; 681 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 682 } 683 684 if (copy_on_read) { 685 bdrv_flags |= BDRV_O_COPY_ON_READ; 686 } 687 688 if (runstate_check(RUN_STATE_INMIGRATE)) { 689 bdrv_flags |= BDRV_O_INCOMING; 690 } 691 692 if (media == MEDIA_CDROM) { 693 /* CDROM is fine for any interface, don't check. */ 694 ro = 1; 695 } else if (ro == 1) { 696 if (type != IF_SCSI && type != IF_VIRTIO && type != IF_FLOPPY && 697 type != IF_NONE && type != IF_PFLASH) { 698 error_report("read-only not supported by this bus type"); 699 goto err; 700 } 701 } 702 703 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 704 705 if (ro && copy_on_read) { 706 error_report("warning: disabling copy_on_read on read-only drive"); 707 } 708 709 QINCREF(bs_opts); 710 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv); 711 712 if (ret < 0) { 713 if (ret == -EMEDIUMTYPE) { 714 error_report("could not open disk image %s: not in %s format", 715 file ?: dinfo->id, drv ? drv->format_name : 716 qdict_get_str(bs_opts, "driver")); 717 } else { 718 error_report("could not open disk image %s: %s", 719 file ?: dinfo->id, strerror(-ret)); 720 } 721 goto err; 722 } 723 724 if (bdrv_key_required(dinfo->bdrv)) 725 autostart = 0; 726 727 QDECREF(bs_opts); 728 qemu_opts_del(opts); 729 730 return dinfo; 731 732 err: 733 qemu_opts_del(opts); 734 QDECREF(bs_opts); 735 bdrv_delete(dinfo->bdrv); 736 g_free(dinfo->id); 737 QTAILQ_REMOVE(&drives, dinfo, next); 738 g_free(dinfo); 739 return NULL; 740 } 741 742 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to) 743 { 744 const char *value; 745 746 value = qemu_opt_get(opts, from); 747 if (value) { 748 qemu_opt_set(opts, to, value); 749 qemu_opt_unset(opts, from); 750 } 751 } 752 753 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type) 754 { 755 const char *value; 756 757 /* Change legacy command line options into QMP ones */ 758 qemu_opt_rename(all_opts, "iops", "throttling.iops-total"); 759 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read"); 760 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write"); 761 762 qemu_opt_rename(all_opts, "bps", "throttling.bps-total"); 763 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read"); 764 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write"); 765 766 qemu_opt_rename(all_opts, "readonly", "read-only"); 767 768 value = qemu_opt_get(all_opts, "cache"); 769 if (value) { 770 int flags = 0; 771 772 if (bdrv_parse_cache_flags(value, &flags) != 0) { 773 error_report("invalid cache option"); 774 return NULL; 775 } 776 777 /* Specific options take precedence */ 778 if (!qemu_opt_get(all_opts, "cache.writeback")) { 779 qemu_opt_set_bool(all_opts, "cache.writeback", 780 !!(flags & BDRV_O_CACHE_WB)); 781 } 782 if (!qemu_opt_get(all_opts, "cache.direct")) { 783 qemu_opt_set_bool(all_opts, "cache.direct", 784 !!(flags & BDRV_O_NOCACHE)); 785 } 786 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 787 qemu_opt_set_bool(all_opts, "cache.no-flush", 788 !!(flags & BDRV_O_NO_FLUSH)); 789 } 790 qemu_opt_unset(all_opts, "cache"); 791 } 792 793 return blockdev_init(all_opts, block_default_type); 794 } 795 796 void do_commit(Monitor *mon, const QDict *qdict) 797 { 798 const char *device = qdict_get_str(qdict, "device"); 799 BlockDriverState *bs; 800 int ret; 801 802 if (!strcmp(device, "all")) { 803 ret = bdrv_commit_all(); 804 } else { 805 bs = bdrv_find(device); 806 if (!bs) { 807 monitor_printf(mon, "Device '%s' not found\n", device); 808 return; 809 } 810 ret = bdrv_commit(bs); 811 } 812 if (ret < 0) { 813 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 814 strerror(-ret)); 815 } 816 } 817 818 static void blockdev_do_action(int kind, void *data, Error **errp) 819 { 820 TransactionAction action; 821 TransactionActionList list; 822 823 action.kind = kind; 824 action.data = data; 825 list.value = &action; 826 list.next = NULL; 827 qmp_transaction(&list, errp); 828 } 829 830 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, 831 bool has_format, const char *format, 832 bool has_mode, enum NewImageMode mode, 833 Error **errp) 834 { 835 BlockdevSnapshot snapshot = { 836 .device = (char *) device, 837 .snapshot_file = (char *) snapshot_file, 838 .has_format = has_format, 839 .format = (char *) format, 840 .has_mode = has_mode, 841 .mode = mode, 842 }; 843 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 844 &snapshot, errp); 845 } 846 847 848 /* New and old BlockDriverState structs for group snapshots */ 849 850 typedef struct BlkTransactionState BlkTransactionState; 851 852 /* Only prepare() may fail. In a single transaction, only one of commit() or 853 abort() will be called, clean() will always be called if it present. */ 854 typedef struct BdrvActionOps { 855 /* Size of state struct, in bytes. */ 856 size_t instance_size; 857 /* Prepare the work, must NOT be NULL. */ 858 void (*prepare)(BlkTransactionState *common, Error **errp); 859 /* Commit the changes, can be NULL. */ 860 void (*commit)(BlkTransactionState *common); 861 /* Abort the changes on fail, can be NULL. */ 862 void (*abort)(BlkTransactionState *common); 863 /* Clean up resource in the end, can be NULL. */ 864 void (*clean)(BlkTransactionState *common); 865 } BdrvActionOps; 866 867 /* 868 * This structure must be arranged as first member in child type, assuming 869 * that compiler will also arrange it to the same address with parent instance. 870 * Later it will be used in free(). 871 */ 872 struct BlkTransactionState { 873 TransactionAction *action; 874 const BdrvActionOps *ops; 875 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 876 }; 877 878 /* external snapshot private data */ 879 typedef struct ExternalSnapshotState { 880 BlkTransactionState common; 881 BlockDriverState *old_bs; 882 BlockDriverState *new_bs; 883 } ExternalSnapshotState; 884 885 static void external_snapshot_prepare(BlkTransactionState *common, 886 Error **errp) 887 { 888 BlockDriver *drv; 889 int flags, ret; 890 Error *local_err = NULL; 891 const char *device; 892 const char *new_image_file; 893 const char *format = "qcow2"; 894 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 895 ExternalSnapshotState *state = 896 DO_UPCAST(ExternalSnapshotState, common, common); 897 TransactionAction *action = common->action; 898 899 /* get parameters */ 900 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 901 902 device = action->blockdev_snapshot_sync->device; 903 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 904 if (action->blockdev_snapshot_sync->has_format) { 905 format = action->blockdev_snapshot_sync->format; 906 } 907 if (action->blockdev_snapshot_sync->has_mode) { 908 mode = action->blockdev_snapshot_sync->mode; 909 } 910 911 /* start processing */ 912 drv = bdrv_find_format(format); 913 if (!drv) { 914 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 915 return; 916 } 917 918 state->old_bs = bdrv_find(device); 919 if (!state->old_bs) { 920 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 921 return; 922 } 923 924 if (!bdrv_is_inserted(state->old_bs)) { 925 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 926 return; 927 } 928 929 if (bdrv_in_use(state->old_bs)) { 930 error_set(errp, QERR_DEVICE_IN_USE, device); 931 return; 932 } 933 934 if (!bdrv_is_read_only(state->old_bs)) { 935 if (bdrv_flush(state->old_bs)) { 936 error_set(errp, QERR_IO_ERROR); 937 return; 938 } 939 } 940 941 flags = state->old_bs->open_flags; 942 943 /* create new image w/backing file */ 944 if (mode != NEW_IMAGE_MODE_EXISTING) { 945 bdrv_img_create(new_image_file, format, 946 state->old_bs->filename, 947 state->old_bs->drv->format_name, 948 NULL, -1, flags, &local_err, false); 949 if (error_is_set(&local_err)) { 950 error_propagate(errp, local_err); 951 return; 952 } 953 } 954 955 /* We will manually add the backing_hd field to the bs later */ 956 state->new_bs = bdrv_new(""); 957 /* TODO Inherit bs->options or only take explicit options with an 958 * extended QMP command? */ 959 ret = bdrv_open(state->new_bs, new_image_file, NULL, 960 flags | BDRV_O_NO_BACKING, drv); 961 if (ret != 0) { 962 error_setg_file_open(errp, -ret, new_image_file); 963 } 964 } 965 966 static void external_snapshot_commit(BlkTransactionState *common) 967 { 968 ExternalSnapshotState *state = 969 DO_UPCAST(ExternalSnapshotState, common, common); 970 971 /* This removes our old bs and adds the new bs */ 972 bdrv_append(state->new_bs, state->old_bs); 973 /* We don't need (or want) to use the transactional 974 * bdrv_reopen_multiple() across all the entries at once, because we 975 * don't want to abort all of them if one of them fails the reopen */ 976 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 977 NULL); 978 } 979 980 static void external_snapshot_abort(BlkTransactionState *common) 981 { 982 ExternalSnapshotState *state = 983 DO_UPCAST(ExternalSnapshotState, common, common); 984 if (state->new_bs) { 985 bdrv_delete(state->new_bs); 986 } 987 } 988 989 typedef struct DriveBackupState { 990 BlkTransactionState common; 991 BlockDriverState *bs; 992 BlockJob *job; 993 } DriveBackupState; 994 995 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 996 { 997 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 998 DriveBackup *backup; 999 Error *local_err = NULL; 1000 1001 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1002 backup = common->action->drive_backup; 1003 1004 qmp_drive_backup(backup->device, backup->target, 1005 backup->has_format, backup->format, 1006 backup->sync, 1007 backup->has_mode, backup->mode, 1008 backup->has_speed, backup->speed, 1009 backup->has_on_source_error, backup->on_source_error, 1010 backup->has_on_target_error, backup->on_target_error, 1011 &local_err); 1012 if (error_is_set(&local_err)) { 1013 error_propagate(errp, local_err); 1014 state->bs = NULL; 1015 state->job = NULL; 1016 return; 1017 } 1018 1019 state->bs = bdrv_find(backup->device); 1020 state->job = state->bs->job; 1021 } 1022 1023 static void drive_backup_abort(BlkTransactionState *common) 1024 { 1025 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1026 BlockDriverState *bs = state->bs; 1027 1028 /* Only cancel if it's the job we started */ 1029 if (bs && bs->job && bs->job == state->job) { 1030 block_job_cancel_sync(bs->job); 1031 } 1032 } 1033 1034 static void abort_prepare(BlkTransactionState *common, Error **errp) 1035 { 1036 error_setg(errp, "Transaction aborted using Abort action"); 1037 } 1038 1039 static void abort_commit(BlkTransactionState *common) 1040 { 1041 g_assert_not_reached(); /* this action never succeeds */ 1042 } 1043 1044 static const BdrvActionOps actions[] = { 1045 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1046 .instance_size = sizeof(ExternalSnapshotState), 1047 .prepare = external_snapshot_prepare, 1048 .commit = external_snapshot_commit, 1049 .abort = external_snapshot_abort, 1050 }, 1051 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1052 .instance_size = sizeof(DriveBackupState), 1053 .prepare = drive_backup_prepare, 1054 .abort = drive_backup_abort, 1055 }, 1056 [TRANSACTION_ACTION_KIND_ABORT] = { 1057 .instance_size = sizeof(BlkTransactionState), 1058 .prepare = abort_prepare, 1059 .commit = abort_commit, 1060 }, 1061 }; 1062 1063 /* 1064 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1065 * then we do not pivot any of the devices in the group, and abandon the 1066 * snapshots 1067 */ 1068 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1069 { 1070 TransactionActionList *dev_entry = dev_list; 1071 BlkTransactionState *state, *next; 1072 Error *local_err = NULL; 1073 1074 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1075 QSIMPLEQ_INIT(&snap_bdrv_states); 1076 1077 /* drain all i/o before any snapshots */ 1078 bdrv_drain_all(); 1079 1080 /* We don't do anything in this loop that commits us to the snapshot */ 1081 while (NULL != dev_entry) { 1082 TransactionAction *dev_info = NULL; 1083 const BdrvActionOps *ops; 1084 1085 dev_info = dev_entry->value; 1086 dev_entry = dev_entry->next; 1087 1088 assert(dev_info->kind < ARRAY_SIZE(actions)); 1089 1090 ops = &actions[dev_info->kind]; 1091 state = g_malloc0(ops->instance_size); 1092 state->ops = ops; 1093 state->action = dev_info; 1094 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1095 1096 state->ops->prepare(state, &local_err); 1097 if (error_is_set(&local_err)) { 1098 error_propagate(errp, local_err); 1099 goto delete_and_fail; 1100 } 1101 } 1102 1103 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1104 if (state->ops->commit) { 1105 state->ops->commit(state); 1106 } 1107 } 1108 1109 /* success */ 1110 goto exit; 1111 1112 delete_and_fail: 1113 /* 1114 * failure, and it is all-or-none; abandon each new bs, and keep using 1115 * the original bs for all images 1116 */ 1117 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1118 if (state->ops->abort) { 1119 state->ops->abort(state); 1120 } 1121 } 1122 exit: 1123 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1124 if (state->ops->clean) { 1125 state->ops->clean(state); 1126 } 1127 g_free(state); 1128 } 1129 } 1130 1131 1132 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1133 { 1134 if (bdrv_in_use(bs)) { 1135 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1136 return; 1137 } 1138 if (!bdrv_dev_has_removable_media(bs)) { 1139 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 1140 return; 1141 } 1142 1143 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1144 bdrv_dev_eject_request(bs, force); 1145 if (!force) { 1146 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 1147 return; 1148 } 1149 } 1150 1151 bdrv_close(bs); 1152 } 1153 1154 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1155 { 1156 BlockDriverState *bs; 1157 1158 bs = bdrv_find(device); 1159 if (!bs) { 1160 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1161 return; 1162 } 1163 1164 eject_device(bs, force, errp); 1165 } 1166 1167 void qmp_block_passwd(const char *device, const char *password, Error **errp) 1168 { 1169 BlockDriverState *bs; 1170 int err; 1171 1172 bs = bdrv_find(device); 1173 if (!bs) { 1174 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1175 return; 1176 } 1177 1178 err = bdrv_set_key(bs, password); 1179 if (err == -EINVAL) { 1180 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1181 return; 1182 } else if (err < 0) { 1183 error_set(errp, QERR_INVALID_PASSWORD); 1184 return; 1185 } 1186 } 1187 1188 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1189 int bdrv_flags, BlockDriver *drv, 1190 const char *password, Error **errp) 1191 { 1192 int ret; 1193 1194 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv); 1195 if (ret < 0) { 1196 error_setg_file_open(errp, -ret, filename); 1197 return; 1198 } 1199 1200 if (bdrv_key_required(bs)) { 1201 if (password) { 1202 if (bdrv_set_key(bs, password) < 0) { 1203 error_set(errp, QERR_INVALID_PASSWORD); 1204 } 1205 } else { 1206 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1207 bdrv_get_encrypted_filename(bs)); 1208 } 1209 } else if (password) { 1210 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1211 } 1212 } 1213 1214 void qmp_change_blockdev(const char *device, const char *filename, 1215 bool has_format, const char *format, Error **errp) 1216 { 1217 BlockDriverState *bs; 1218 BlockDriver *drv = NULL; 1219 int bdrv_flags; 1220 Error *err = NULL; 1221 1222 bs = bdrv_find(device); 1223 if (!bs) { 1224 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1225 return; 1226 } 1227 1228 if (format) { 1229 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1230 if (!drv) { 1231 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1232 return; 1233 } 1234 } 1235 1236 eject_device(bs, 0, &err); 1237 if (error_is_set(&err)) { 1238 error_propagate(errp, err); 1239 return; 1240 } 1241 1242 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1243 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1244 1245 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1246 } 1247 1248 /* throttling disk I/O limits */ 1249 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1250 int64_t bps_wr, int64_t iops, int64_t iops_rd, 1251 int64_t iops_wr, Error **errp) 1252 { 1253 BlockIOLimit io_limits; 1254 BlockDriverState *bs; 1255 1256 bs = bdrv_find(device); 1257 if (!bs) { 1258 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1259 return; 1260 } 1261 1262 io_limits.bps[BLOCK_IO_LIMIT_TOTAL] = bps; 1263 io_limits.bps[BLOCK_IO_LIMIT_READ] = bps_rd; 1264 io_limits.bps[BLOCK_IO_LIMIT_WRITE] = bps_wr; 1265 io_limits.iops[BLOCK_IO_LIMIT_TOTAL]= iops; 1266 io_limits.iops[BLOCK_IO_LIMIT_READ] = iops_rd; 1267 io_limits.iops[BLOCK_IO_LIMIT_WRITE]= iops_wr; 1268 1269 if (!do_check_io_limits(&io_limits, errp)) { 1270 return; 1271 } 1272 1273 bs->io_limits = io_limits; 1274 1275 if (!bs->io_limits_enabled && bdrv_io_limits_enabled(bs)) { 1276 bdrv_io_limits_enable(bs); 1277 } else if (bs->io_limits_enabled && !bdrv_io_limits_enabled(bs)) { 1278 bdrv_io_limits_disable(bs); 1279 } else { 1280 if (bs->block_timer) { 1281 timer_mod(bs->block_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); 1282 } 1283 } 1284 } 1285 1286 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1287 { 1288 const char *id = qdict_get_str(qdict, "id"); 1289 BlockDriverState *bs; 1290 1291 bs = bdrv_find(id); 1292 if (!bs) { 1293 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1294 return -1; 1295 } 1296 if (bdrv_in_use(bs)) { 1297 qerror_report(QERR_DEVICE_IN_USE, id); 1298 return -1; 1299 } 1300 1301 /* quiesce block driver; prevent further io */ 1302 bdrv_drain_all(); 1303 bdrv_flush(bs); 1304 bdrv_close(bs); 1305 1306 /* if we have a device attached to this BlockDriverState 1307 * then we need to make the drive anonymous until the device 1308 * can be removed. If this is a drive with no device backing 1309 * then we can just get rid of the block driver state right here. 1310 */ 1311 if (bdrv_get_attached_dev(bs)) { 1312 bdrv_make_anon(bs); 1313 1314 /* Further I/O must not pause the guest */ 1315 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1316 BLOCKDEV_ON_ERROR_REPORT); 1317 } else { 1318 drive_uninit(drive_get_by_blockdev(bs)); 1319 } 1320 1321 return 0; 1322 } 1323 1324 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1325 { 1326 BlockDriverState *bs; 1327 int ret; 1328 1329 bs = bdrv_find(device); 1330 if (!bs) { 1331 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1332 return; 1333 } 1334 1335 if (size < 0) { 1336 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1337 return; 1338 } 1339 1340 /* complete all in-flight operations before resizing the device */ 1341 bdrv_drain_all(); 1342 1343 ret = bdrv_truncate(bs, size); 1344 switch (ret) { 1345 case 0: 1346 break; 1347 case -ENOMEDIUM: 1348 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1349 break; 1350 case -ENOTSUP: 1351 error_set(errp, QERR_UNSUPPORTED); 1352 break; 1353 case -EACCES: 1354 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1355 break; 1356 case -EBUSY: 1357 error_set(errp, QERR_DEVICE_IN_USE, device); 1358 break; 1359 default: 1360 error_setg_errno(errp, -ret, "Could not resize"); 1361 break; 1362 } 1363 } 1364 1365 static void block_job_cb(void *opaque, int ret) 1366 { 1367 BlockDriverState *bs = opaque; 1368 QObject *obj; 1369 1370 trace_block_job_cb(bs, bs->job, ret); 1371 1372 assert(bs->job); 1373 obj = qobject_from_block_job(bs->job); 1374 if (ret < 0) { 1375 QDict *dict = qobject_to_qdict(obj); 1376 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1377 } 1378 1379 if (block_job_is_cancelled(bs->job)) { 1380 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1381 } else { 1382 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1383 } 1384 qobject_decref(obj); 1385 1386 drive_put_ref_bh_schedule(drive_get_by_blockdev(bs)); 1387 } 1388 1389 void qmp_block_stream(const char *device, bool has_base, 1390 const char *base, bool has_speed, int64_t speed, 1391 bool has_on_error, BlockdevOnError on_error, 1392 Error **errp) 1393 { 1394 BlockDriverState *bs; 1395 BlockDriverState *base_bs = NULL; 1396 Error *local_err = NULL; 1397 1398 if (!has_on_error) { 1399 on_error = BLOCKDEV_ON_ERROR_REPORT; 1400 } 1401 1402 bs = bdrv_find(device); 1403 if (!bs) { 1404 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1405 return; 1406 } 1407 1408 if (base) { 1409 base_bs = bdrv_find_backing_image(bs, base); 1410 if (base_bs == NULL) { 1411 error_set(errp, QERR_BASE_NOT_FOUND, base); 1412 return; 1413 } 1414 } 1415 1416 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1417 on_error, block_job_cb, bs, &local_err); 1418 if (error_is_set(&local_err)) { 1419 error_propagate(errp, local_err); 1420 return; 1421 } 1422 1423 /* Grab a reference so hotplug does not delete the BlockDriverState from 1424 * underneath us. 1425 */ 1426 drive_get_ref(drive_get_by_blockdev(bs)); 1427 1428 trace_qmp_block_stream(bs, bs->job); 1429 } 1430 1431 void qmp_block_commit(const char *device, 1432 bool has_base, const char *base, const char *top, 1433 bool has_speed, int64_t speed, 1434 Error **errp) 1435 { 1436 BlockDriverState *bs; 1437 BlockDriverState *base_bs, *top_bs; 1438 Error *local_err = NULL; 1439 /* This will be part of the QMP command, if/when the 1440 * BlockdevOnError change for blkmirror makes it in 1441 */ 1442 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1443 1444 /* drain all i/o before commits */ 1445 bdrv_drain_all(); 1446 1447 bs = bdrv_find(device); 1448 if (!bs) { 1449 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1450 return; 1451 } 1452 1453 /* default top_bs is the active layer */ 1454 top_bs = bs; 1455 1456 if (top) { 1457 if (strcmp(bs->filename, top) != 0) { 1458 top_bs = bdrv_find_backing_image(bs, top); 1459 } 1460 } 1461 1462 if (top_bs == NULL) { 1463 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1464 return; 1465 } 1466 1467 if (has_base && base) { 1468 base_bs = bdrv_find_backing_image(top_bs, base); 1469 } else { 1470 base_bs = bdrv_find_base(top_bs); 1471 } 1472 1473 if (base_bs == NULL) { 1474 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1475 return; 1476 } 1477 1478 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1479 &local_err); 1480 if (local_err != NULL) { 1481 error_propagate(errp, local_err); 1482 return; 1483 } 1484 /* Grab a reference so hotplug does not delete the BlockDriverState from 1485 * underneath us. 1486 */ 1487 drive_get_ref(drive_get_by_blockdev(bs)); 1488 } 1489 1490 void qmp_drive_backup(const char *device, const char *target, 1491 bool has_format, const char *format, 1492 enum MirrorSyncMode sync, 1493 bool has_mode, enum NewImageMode mode, 1494 bool has_speed, int64_t speed, 1495 bool has_on_source_error, BlockdevOnError on_source_error, 1496 bool has_on_target_error, BlockdevOnError on_target_error, 1497 Error **errp) 1498 { 1499 BlockDriverState *bs; 1500 BlockDriverState *target_bs; 1501 BlockDriverState *source = NULL; 1502 BlockDriver *drv = NULL; 1503 Error *local_err = NULL; 1504 int flags; 1505 int64_t size; 1506 int ret; 1507 1508 if (!has_speed) { 1509 speed = 0; 1510 } 1511 if (!has_on_source_error) { 1512 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1513 } 1514 if (!has_on_target_error) { 1515 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1516 } 1517 if (!has_mode) { 1518 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1519 } 1520 1521 bs = bdrv_find(device); 1522 if (!bs) { 1523 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1524 return; 1525 } 1526 1527 if (!bdrv_is_inserted(bs)) { 1528 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1529 return; 1530 } 1531 1532 if (!has_format) { 1533 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1534 } 1535 if (format) { 1536 drv = bdrv_find_format(format); 1537 if (!drv) { 1538 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1539 return; 1540 } 1541 } 1542 1543 if (bdrv_in_use(bs)) { 1544 error_set(errp, QERR_DEVICE_IN_USE, device); 1545 return; 1546 } 1547 1548 flags = bs->open_flags | BDRV_O_RDWR; 1549 1550 /* See if we have a backing HD we can use to create our new image 1551 * on top of. */ 1552 if (sync == MIRROR_SYNC_MODE_TOP) { 1553 source = bs->backing_hd; 1554 if (!source) { 1555 sync = MIRROR_SYNC_MODE_FULL; 1556 } 1557 } 1558 if (sync == MIRROR_SYNC_MODE_NONE) { 1559 source = bs; 1560 } 1561 1562 size = bdrv_getlength(bs); 1563 if (size < 0) { 1564 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1565 return; 1566 } 1567 1568 if (mode != NEW_IMAGE_MODE_EXISTING) { 1569 assert(format && drv); 1570 if (source) { 1571 bdrv_img_create(target, format, source->filename, 1572 source->drv->format_name, NULL, 1573 size, flags, &local_err, false); 1574 } else { 1575 bdrv_img_create(target, format, NULL, NULL, NULL, 1576 size, flags, &local_err, false); 1577 } 1578 } 1579 1580 if (error_is_set(&local_err)) { 1581 error_propagate(errp, local_err); 1582 return; 1583 } 1584 1585 target_bs = bdrv_new(""); 1586 ret = bdrv_open(target_bs, target, NULL, flags, drv); 1587 if (ret < 0) { 1588 bdrv_delete(target_bs); 1589 error_setg_file_open(errp, -ret, target); 1590 return; 1591 } 1592 1593 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 1594 block_job_cb, bs, &local_err); 1595 if (local_err != NULL) { 1596 bdrv_delete(target_bs); 1597 error_propagate(errp, local_err); 1598 return; 1599 } 1600 1601 /* Grab a reference so hotplug does not delete the BlockDriverState from 1602 * underneath us. 1603 */ 1604 drive_get_ref(drive_get_by_blockdev(bs)); 1605 } 1606 1607 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 1608 1609 void qmp_drive_mirror(const char *device, const char *target, 1610 bool has_format, const char *format, 1611 enum MirrorSyncMode sync, 1612 bool has_mode, enum NewImageMode mode, 1613 bool has_speed, int64_t speed, 1614 bool has_granularity, uint32_t granularity, 1615 bool has_buf_size, int64_t buf_size, 1616 bool has_on_source_error, BlockdevOnError on_source_error, 1617 bool has_on_target_error, BlockdevOnError on_target_error, 1618 Error **errp) 1619 { 1620 BlockDriverState *bs; 1621 BlockDriverState *source, *target_bs; 1622 BlockDriver *drv = NULL; 1623 Error *local_err = NULL; 1624 int flags; 1625 int64_t size; 1626 int ret; 1627 1628 if (!has_speed) { 1629 speed = 0; 1630 } 1631 if (!has_on_source_error) { 1632 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1633 } 1634 if (!has_on_target_error) { 1635 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1636 } 1637 if (!has_mode) { 1638 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1639 } 1640 if (!has_granularity) { 1641 granularity = 0; 1642 } 1643 if (!has_buf_size) { 1644 buf_size = DEFAULT_MIRROR_BUF_SIZE; 1645 } 1646 1647 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 1648 error_set(errp, QERR_INVALID_PARAMETER, device); 1649 return; 1650 } 1651 if (granularity & (granularity - 1)) { 1652 error_set(errp, QERR_INVALID_PARAMETER, device); 1653 return; 1654 } 1655 1656 bs = bdrv_find(device); 1657 if (!bs) { 1658 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1659 return; 1660 } 1661 1662 if (!bdrv_is_inserted(bs)) { 1663 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1664 return; 1665 } 1666 1667 if (!has_format) { 1668 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1669 } 1670 if (format) { 1671 drv = bdrv_find_format(format); 1672 if (!drv) { 1673 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1674 return; 1675 } 1676 } 1677 1678 if (bdrv_in_use(bs)) { 1679 error_set(errp, QERR_DEVICE_IN_USE, device); 1680 return; 1681 } 1682 1683 flags = bs->open_flags | BDRV_O_RDWR; 1684 source = bs->backing_hd; 1685 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 1686 sync = MIRROR_SYNC_MODE_FULL; 1687 } 1688 1689 size = bdrv_getlength(bs); 1690 if (size < 0) { 1691 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1692 return; 1693 } 1694 1695 if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) { 1696 /* create new image w/o backing file */ 1697 assert(format && drv); 1698 bdrv_img_create(target, format, 1699 NULL, NULL, NULL, size, flags, &local_err, false); 1700 } else { 1701 switch (mode) { 1702 case NEW_IMAGE_MODE_EXISTING: 1703 ret = 0; 1704 break; 1705 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 1706 /* create new image with backing file */ 1707 bdrv_img_create(target, format, 1708 source->filename, 1709 source->drv->format_name, 1710 NULL, size, flags, &local_err, false); 1711 break; 1712 default: 1713 abort(); 1714 } 1715 } 1716 1717 if (error_is_set(&local_err)) { 1718 error_propagate(errp, local_err); 1719 return; 1720 } 1721 1722 /* Mirroring takes care of copy-on-write using the source's backing 1723 * file. 1724 */ 1725 target_bs = bdrv_new(""); 1726 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv); 1727 if (ret < 0) { 1728 bdrv_delete(target_bs); 1729 error_setg_file_open(errp, -ret, target); 1730 return; 1731 } 1732 1733 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 1734 on_source_error, on_target_error, 1735 block_job_cb, bs, &local_err); 1736 if (local_err != NULL) { 1737 bdrv_delete(target_bs); 1738 error_propagate(errp, local_err); 1739 return; 1740 } 1741 1742 /* Grab a reference so hotplug does not delete the BlockDriverState from 1743 * underneath us. 1744 */ 1745 drive_get_ref(drive_get_by_blockdev(bs)); 1746 } 1747 1748 static BlockJob *find_block_job(const char *device) 1749 { 1750 BlockDriverState *bs; 1751 1752 bs = bdrv_find(device); 1753 if (!bs || !bs->job) { 1754 return NULL; 1755 } 1756 return bs->job; 1757 } 1758 1759 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 1760 { 1761 BlockJob *job = find_block_job(device); 1762 1763 if (!job) { 1764 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1765 return; 1766 } 1767 1768 block_job_set_speed(job, speed, errp); 1769 } 1770 1771 void qmp_block_job_cancel(const char *device, 1772 bool has_force, bool force, Error **errp) 1773 { 1774 BlockJob *job = find_block_job(device); 1775 1776 if (!has_force) { 1777 force = false; 1778 } 1779 1780 if (!job) { 1781 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1782 return; 1783 } 1784 if (job->paused && !force) { 1785 error_set(errp, QERR_BLOCK_JOB_PAUSED, device); 1786 return; 1787 } 1788 1789 trace_qmp_block_job_cancel(job); 1790 block_job_cancel(job); 1791 } 1792 1793 void qmp_block_job_pause(const char *device, Error **errp) 1794 { 1795 BlockJob *job = find_block_job(device); 1796 1797 if (!job) { 1798 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1799 return; 1800 } 1801 1802 trace_qmp_block_job_pause(job); 1803 block_job_pause(job); 1804 } 1805 1806 void qmp_block_job_resume(const char *device, Error **errp) 1807 { 1808 BlockJob *job = find_block_job(device); 1809 1810 if (!job) { 1811 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1812 return; 1813 } 1814 1815 trace_qmp_block_job_resume(job); 1816 block_job_resume(job); 1817 } 1818 1819 void qmp_block_job_complete(const char *device, Error **errp) 1820 { 1821 BlockJob *job = find_block_job(device); 1822 1823 if (!job) { 1824 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 1825 return; 1826 } 1827 1828 trace_qmp_block_job_complete(job); 1829 block_job_complete(job, errp); 1830 } 1831 1832 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 1833 { 1834 BlockJobInfoList **prev = opaque; 1835 BlockJob *job = bs->job; 1836 1837 if (job) { 1838 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 1839 elem->value = block_job_query(bs->job); 1840 (*prev)->next = elem; 1841 *prev = elem; 1842 } 1843 } 1844 1845 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 1846 { 1847 /* Dummy is a fake list element for holding the head pointer */ 1848 BlockJobInfoList dummy = {}; 1849 BlockJobInfoList *prev = &dummy; 1850 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 1851 return dummy.next; 1852 } 1853 1854 QemuOptsList qemu_common_drive_opts = { 1855 .name = "drive", 1856 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 1857 .desc = { 1858 { 1859 .name = "bus", 1860 .type = QEMU_OPT_NUMBER, 1861 .help = "bus number", 1862 },{ 1863 .name = "unit", 1864 .type = QEMU_OPT_NUMBER, 1865 .help = "unit number (i.e. lun for scsi)", 1866 },{ 1867 .name = "if", 1868 .type = QEMU_OPT_STRING, 1869 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 1870 },{ 1871 .name = "index", 1872 .type = QEMU_OPT_NUMBER, 1873 .help = "index number", 1874 },{ 1875 .name = "cyls", 1876 .type = QEMU_OPT_NUMBER, 1877 .help = "number of cylinders (ide disk geometry)", 1878 },{ 1879 .name = "heads", 1880 .type = QEMU_OPT_NUMBER, 1881 .help = "number of heads (ide disk geometry)", 1882 },{ 1883 .name = "secs", 1884 .type = QEMU_OPT_NUMBER, 1885 .help = "number of sectors (ide disk geometry)", 1886 },{ 1887 .name = "trans", 1888 .type = QEMU_OPT_STRING, 1889 .help = "chs translation (auto, lba. none)", 1890 },{ 1891 .name = "media", 1892 .type = QEMU_OPT_STRING, 1893 .help = "media type (disk, cdrom)", 1894 },{ 1895 .name = "snapshot", 1896 .type = QEMU_OPT_BOOL, 1897 .help = "enable/disable snapshot mode", 1898 },{ 1899 .name = "file", 1900 .type = QEMU_OPT_STRING, 1901 .help = "disk image", 1902 },{ 1903 .name = "discard", 1904 .type = QEMU_OPT_STRING, 1905 .help = "discard operation (ignore/off, unmap/on)", 1906 },{ 1907 .name = "cache.writeback", 1908 .type = QEMU_OPT_BOOL, 1909 .help = "enables writeback mode for any caches", 1910 },{ 1911 .name = "cache.direct", 1912 .type = QEMU_OPT_BOOL, 1913 .help = "enables use of O_DIRECT (bypass the host page cache)", 1914 },{ 1915 .name = "cache.no-flush", 1916 .type = QEMU_OPT_BOOL, 1917 .help = "ignore any flush requests for the device", 1918 },{ 1919 .name = "aio", 1920 .type = QEMU_OPT_STRING, 1921 .help = "host AIO implementation (threads, native)", 1922 },{ 1923 .name = "format", 1924 .type = QEMU_OPT_STRING, 1925 .help = "disk format (raw, qcow2, ...)", 1926 },{ 1927 .name = "serial", 1928 .type = QEMU_OPT_STRING, 1929 .help = "disk serial number", 1930 },{ 1931 .name = "rerror", 1932 .type = QEMU_OPT_STRING, 1933 .help = "read error action", 1934 },{ 1935 .name = "werror", 1936 .type = QEMU_OPT_STRING, 1937 .help = "write error action", 1938 },{ 1939 .name = "addr", 1940 .type = QEMU_OPT_STRING, 1941 .help = "pci address (virtio only)", 1942 },{ 1943 .name = "read-only", 1944 .type = QEMU_OPT_BOOL, 1945 .help = "open drive file as read-only", 1946 },{ 1947 .name = "throttling.iops-total", 1948 .type = QEMU_OPT_NUMBER, 1949 .help = "limit total I/O operations per second", 1950 },{ 1951 .name = "throttling.iops-read", 1952 .type = QEMU_OPT_NUMBER, 1953 .help = "limit read operations per second", 1954 },{ 1955 .name = "throttling.iops-write", 1956 .type = QEMU_OPT_NUMBER, 1957 .help = "limit write operations per second", 1958 },{ 1959 .name = "throttling.bps-total", 1960 .type = QEMU_OPT_NUMBER, 1961 .help = "limit total bytes per second", 1962 },{ 1963 .name = "throttling.bps-read", 1964 .type = QEMU_OPT_NUMBER, 1965 .help = "limit read bytes per second", 1966 },{ 1967 .name = "throttling.bps-write", 1968 .type = QEMU_OPT_NUMBER, 1969 .help = "limit write bytes per second", 1970 },{ 1971 .name = "copy-on-read", 1972 .type = QEMU_OPT_BOOL, 1973 .help = "copy read data from backing file into image file", 1974 },{ 1975 .name = "boot", 1976 .type = QEMU_OPT_BOOL, 1977 .help = "(deprecated, ignored)", 1978 }, 1979 { /* end of list */ } 1980 }, 1981 }; 1982 1983 QemuOptsList qemu_drive_opts = { 1984 .name = "drive", 1985 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 1986 .desc = { 1987 /* 1988 * no elements => accept any params 1989 * validation will happen later 1990 */ 1991 { /* end of list */ } 1992 }, 1993 }; 1994