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