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/block-backend.h" 34 #include "sysemu/blockdev.h" 35 #include "hw/block/block.h" 36 #include "block/blockjob.h" 37 #include "monitor/monitor.h" 38 #include "qemu/option.h" 39 #include "qemu/config-file.h" 40 #include "qapi/qmp/types.h" 41 #include "qapi-visit.h" 42 #include "qapi/qmp-output-visitor.h" 43 #include "qapi/util.h" 44 #include "sysemu/sysemu.h" 45 #include "block/block_int.h" 46 #include "qmp-commands.h" 47 #include "trace.h" 48 #include "sysemu/arch_init.h" 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 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 * Boards may call this to offer board-by-board overrides 83 * of the default, global values. 84 */ 85 void override_max_devs(BlockInterfaceType type, int max_devs) 86 { 87 BlockBackend *blk; 88 DriveInfo *dinfo; 89 90 if (max_devs <= 0) { 91 return; 92 } 93 94 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 95 dinfo = blk_legacy_dinfo(blk); 96 if (dinfo->type == type) { 97 fprintf(stderr, "Cannot override units-per-bus property of" 98 " the %s interface, because a drive of that type has" 99 " already been added.\n", if_name[type]); 100 g_assert_not_reached(); 101 } 102 } 103 104 if_max_devs[type] = max_devs; 105 } 106 107 /* 108 * We automatically delete the drive when a device using it gets 109 * unplugged. Questionable feature, but we can't just drop it. 110 * Device models call blockdev_mark_auto_del() to schedule the 111 * automatic deletion, and generic qdev code calls blockdev_auto_del() 112 * when deletion is actually safe. 113 */ 114 void blockdev_mark_auto_del(BlockBackend *blk) 115 { 116 DriveInfo *dinfo = blk_legacy_dinfo(blk); 117 BlockDriverState *bs = blk_bs(blk); 118 AioContext *aio_context; 119 120 if (!dinfo) { 121 return; 122 } 123 124 aio_context = bdrv_get_aio_context(bs); 125 aio_context_acquire(aio_context); 126 127 if (bs->job) { 128 block_job_cancel(bs->job); 129 } 130 131 aio_context_release(aio_context); 132 133 dinfo->auto_del = 1; 134 } 135 136 void blockdev_auto_del(BlockBackend *blk) 137 { 138 DriveInfo *dinfo = blk_legacy_dinfo(blk); 139 140 if (dinfo && dinfo->auto_del) { 141 blk_unref(blk); 142 } 143 } 144 145 /** 146 * Returns the current mapping of how many units per bus 147 * a particular interface can support. 148 * 149 * A positive integer indicates n units per bus. 150 * 0 implies the mapping has not been established. 151 * -1 indicates an invalid BlockInterfaceType was given. 152 */ 153 int drive_get_max_devs(BlockInterfaceType type) 154 { 155 if (type >= IF_IDE && type < IF_COUNT) { 156 return if_max_devs[type]; 157 } 158 159 return -1; 160 } 161 162 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 163 { 164 int max_devs = if_max_devs[type]; 165 return max_devs ? index / max_devs : 0; 166 } 167 168 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 169 { 170 int max_devs = if_max_devs[type]; 171 return max_devs ? index % max_devs : index; 172 } 173 174 QemuOpts *drive_def(const char *optstr) 175 { 176 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 177 } 178 179 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 180 const char *optstr) 181 { 182 QemuOpts *opts; 183 184 opts = drive_def(optstr); 185 if (!opts) { 186 return NULL; 187 } 188 if (type != IF_DEFAULT) { 189 qemu_opt_set(opts, "if", if_name[type], &error_abort); 190 } 191 if (index >= 0) { 192 qemu_opt_set_number(opts, "index", index, &error_abort); 193 } 194 if (file) 195 qemu_opt_set(opts, "file", file, &error_abort); 196 return opts; 197 } 198 199 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 200 { 201 BlockBackend *blk; 202 DriveInfo *dinfo; 203 204 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 205 dinfo = blk_legacy_dinfo(blk); 206 if (dinfo && dinfo->type == type 207 && dinfo->bus == bus && dinfo->unit == unit) { 208 return dinfo; 209 } 210 } 211 212 return NULL; 213 } 214 215 bool drive_check_orphaned(void) 216 { 217 BlockBackend *blk; 218 DriveInfo *dinfo; 219 bool rs = false; 220 221 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 222 dinfo = blk_legacy_dinfo(blk); 223 /* If dinfo->bdrv->dev is NULL, it has no device attached. */ 224 /* Unless this is a default drive, this may be an oversight. */ 225 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 226 dinfo->type != IF_NONE) { 227 fprintf(stderr, "Warning: Orphaned drive without device: " 228 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n", 229 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type], 230 dinfo->bus, dinfo->unit); 231 rs = true; 232 } 233 } 234 235 return rs; 236 } 237 238 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 239 { 240 return drive_get(type, 241 drive_index_to_bus_id(type, index), 242 drive_index_to_unit_id(type, index)); 243 } 244 245 int drive_get_max_bus(BlockInterfaceType type) 246 { 247 int max_bus; 248 BlockBackend *blk; 249 DriveInfo *dinfo; 250 251 max_bus = -1; 252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 253 dinfo = blk_legacy_dinfo(blk); 254 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 255 max_bus = dinfo->bus; 256 } 257 } 258 return max_bus; 259 } 260 261 /* Get a block device. This should only be used for single-drive devices 262 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 263 appropriate bus. */ 264 DriveInfo *drive_get_next(BlockInterfaceType type) 265 { 266 static int next_block_unit[IF_COUNT]; 267 268 return drive_get(type, 0, next_block_unit[type]++); 269 } 270 271 static void bdrv_format_print(void *opaque, const char *name) 272 { 273 error_printf(" %s", name); 274 } 275 276 typedef struct { 277 QEMUBH *bh; 278 BlockDriverState *bs; 279 } BDRVPutRefBH; 280 281 static void bdrv_put_ref_bh(void *opaque) 282 { 283 BDRVPutRefBH *s = opaque; 284 285 bdrv_unref(s->bs); 286 qemu_bh_delete(s->bh); 287 g_free(s); 288 } 289 290 /* 291 * Release a BDS reference in a BH 292 * 293 * It is not safe to use bdrv_unref() from a callback function when the callers 294 * still need the BlockDriverState. In such cases we schedule a BH to release 295 * the reference. 296 */ 297 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 298 { 299 BDRVPutRefBH *s; 300 301 s = g_new(BDRVPutRefBH, 1); 302 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 303 s->bs = bs; 304 qemu_bh_schedule(s->bh); 305 } 306 307 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 308 { 309 if (!strcmp(buf, "ignore")) { 310 return BLOCKDEV_ON_ERROR_IGNORE; 311 } else if (!is_read && !strcmp(buf, "enospc")) { 312 return BLOCKDEV_ON_ERROR_ENOSPC; 313 } else if (!strcmp(buf, "stop")) { 314 return BLOCKDEV_ON_ERROR_STOP; 315 } else if (!strcmp(buf, "report")) { 316 return BLOCKDEV_ON_ERROR_REPORT; 317 } else { 318 error_setg(errp, "'%s' invalid %s error action", 319 buf, is_read ? "read" : "write"); 320 return -1; 321 } 322 } 323 324 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 325 { 326 if (throttle_conflicting(cfg)) { 327 error_setg(errp, "bps/iops/max total values and read/write values" 328 " cannot be used at the same time"); 329 return false; 330 } 331 332 if (!throttle_is_valid(cfg)) { 333 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 334 return false; 335 } 336 337 return true; 338 } 339 340 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 341 342 /* Takes the ownership of bs_opts */ 343 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 344 Error **errp) 345 { 346 const char *buf; 347 int ro = 0; 348 int bdrv_flags = 0; 349 int on_read_error, on_write_error; 350 BlockBackend *blk; 351 BlockDriverState *bs; 352 ThrottleConfig cfg; 353 int snapshot = 0; 354 bool copy_on_read; 355 Error *error = NULL; 356 QemuOpts *opts; 357 const char *id; 358 bool has_driver_specific_opts; 359 BlockdevDetectZeroesOptions detect_zeroes; 360 361 /* Check common options by copying from bs_opts to opts, all other options 362 * stay in bs_opts for processing by bdrv_open(). */ 363 id = qdict_get_try_str(bs_opts, "id"); 364 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 365 if (error) { 366 error_propagate(errp, error); 367 goto err_no_opts; 368 } 369 370 qemu_opts_absorb_qdict(opts, bs_opts, &error); 371 if (error) { 372 error_propagate(errp, error); 373 goto early_err; 374 } 375 376 if (id) { 377 qdict_del(bs_opts, "id"); 378 } 379 380 has_driver_specific_opts = !!qdict_size(bs_opts); 381 382 /* extract parameters */ 383 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 384 ro = qemu_opt_get_bool(opts, "read-only", 0); 385 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 386 387 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 388 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 389 error_setg(errp, "invalid discard option"); 390 goto early_err; 391 } 392 } 393 394 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 395 bdrv_flags |= BDRV_O_CACHE_WB; 396 } 397 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 398 bdrv_flags |= BDRV_O_NOCACHE; 399 } 400 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 401 bdrv_flags |= BDRV_O_NO_FLUSH; 402 } 403 404 #ifdef CONFIG_LINUX_AIO 405 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 406 if (!strcmp(buf, "native")) { 407 bdrv_flags |= BDRV_O_NATIVE_AIO; 408 } else if (!strcmp(buf, "threads")) { 409 /* this is the default */ 410 } else { 411 error_setg(errp, "invalid aio option"); 412 goto early_err; 413 } 414 } 415 #endif 416 417 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 418 if (is_help_option(buf)) { 419 error_printf("Supported formats:"); 420 bdrv_iterate_format(bdrv_format_print, NULL); 421 error_printf("\n"); 422 goto early_err; 423 } 424 425 if (qdict_haskey(bs_opts, "driver")) { 426 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 427 goto early_err; 428 } 429 qdict_put(bs_opts, "driver", qstring_from_str(buf)); 430 } 431 432 /* disk I/O throttling */ 433 memset(&cfg, 0, sizeof(cfg)); 434 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 435 qemu_opt_get_number(opts, "throttling.bps-total", 0); 436 cfg.buckets[THROTTLE_BPS_READ].avg = 437 qemu_opt_get_number(opts, "throttling.bps-read", 0); 438 cfg.buckets[THROTTLE_BPS_WRITE].avg = 439 qemu_opt_get_number(opts, "throttling.bps-write", 0); 440 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 441 qemu_opt_get_number(opts, "throttling.iops-total", 0); 442 cfg.buckets[THROTTLE_OPS_READ].avg = 443 qemu_opt_get_number(opts, "throttling.iops-read", 0); 444 cfg.buckets[THROTTLE_OPS_WRITE].avg = 445 qemu_opt_get_number(opts, "throttling.iops-write", 0); 446 447 cfg.buckets[THROTTLE_BPS_TOTAL].max = 448 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 449 cfg.buckets[THROTTLE_BPS_READ].max = 450 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 451 cfg.buckets[THROTTLE_BPS_WRITE].max = 452 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 453 cfg.buckets[THROTTLE_OPS_TOTAL].max = 454 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 455 cfg.buckets[THROTTLE_OPS_READ].max = 456 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 457 cfg.buckets[THROTTLE_OPS_WRITE].max = 458 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 459 460 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 461 462 if (!check_throttle_config(&cfg, &error)) { 463 error_propagate(errp, error); 464 goto early_err; 465 } 466 467 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 468 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 469 on_write_error = parse_block_error_action(buf, 0, &error); 470 if (error) { 471 error_propagate(errp, error); 472 goto early_err; 473 } 474 } 475 476 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 477 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 478 on_read_error = parse_block_error_action(buf, 1, &error); 479 if (error) { 480 error_propagate(errp, error); 481 goto early_err; 482 } 483 } 484 485 detect_zeroes = 486 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 487 qemu_opt_get(opts, "detect-zeroes"), 488 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 489 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 490 &error); 491 if (error) { 492 error_propagate(errp, error); 493 goto early_err; 494 } 495 496 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 497 !(bdrv_flags & BDRV_O_UNMAP)) { 498 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 499 "without setting discard operation to unmap"); 500 goto early_err; 501 } 502 503 /* init */ 504 if ((!file || !*file) && !has_driver_specific_opts) { 505 blk = blk_new_with_bs(qemu_opts_id(opts), errp); 506 if (!blk) { 507 goto early_err; 508 } 509 510 bs = blk_bs(blk); 511 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 512 bs->read_only = ro; 513 514 QDECREF(bs_opts); 515 } else { 516 if (file && !*file) { 517 file = NULL; 518 } 519 520 if (snapshot) { 521 /* always use cache=unsafe with snapshot */ 522 bdrv_flags &= ~BDRV_O_CACHE_MASK; 523 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 524 } 525 526 if (copy_on_read) { 527 bdrv_flags |= BDRV_O_COPY_ON_READ; 528 } 529 530 if (runstate_check(RUN_STATE_INMIGRATE)) { 531 bdrv_flags |= BDRV_O_INCOMING; 532 } 533 534 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 535 536 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags, 537 errp); 538 if (!blk) { 539 goto err_no_bs_opts; 540 } 541 bs = blk_bs(blk); 542 } 543 544 bs->detect_zeroes = detect_zeroes; 545 546 bdrv_set_on_error(bs, on_read_error, on_write_error); 547 548 /* disk I/O throttling */ 549 if (throttle_enabled(&cfg)) { 550 bdrv_io_limits_enable(bs); 551 bdrv_set_io_limits(bs, &cfg); 552 } 553 554 if (bdrv_key_required(bs)) { 555 autostart = 0; 556 } 557 558 err_no_bs_opts: 559 qemu_opts_del(opts); 560 return blk; 561 562 early_err: 563 qemu_opts_del(opts); 564 err_no_opts: 565 QDECREF(bs_opts); 566 return NULL; 567 } 568 569 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 570 Error **errp) 571 { 572 const char *value; 573 574 value = qemu_opt_get(opts, from); 575 if (value) { 576 if (qemu_opt_find(opts, to)) { 577 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 578 "same time", to, from); 579 return; 580 } 581 } 582 583 /* rename all items in opts */ 584 while ((value = qemu_opt_get(opts, from))) { 585 qemu_opt_set(opts, to, value, &error_abort); 586 qemu_opt_unset(opts, from); 587 } 588 } 589 590 QemuOptsList qemu_legacy_drive_opts = { 591 .name = "drive", 592 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 593 .desc = { 594 { 595 .name = "bus", 596 .type = QEMU_OPT_NUMBER, 597 .help = "bus number", 598 },{ 599 .name = "unit", 600 .type = QEMU_OPT_NUMBER, 601 .help = "unit number (i.e. lun for scsi)", 602 },{ 603 .name = "index", 604 .type = QEMU_OPT_NUMBER, 605 .help = "index number", 606 },{ 607 .name = "media", 608 .type = QEMU_OPT_STRING, 609 .help = "media type (disk, cdrom)", 610 },{ 611 .name = "if", 612 .type = QEMU_OPT_STRING, 613 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 614 },{ 615 .name = "cyls", 616 .type = QEMU_OPT_NUMBER, 617 .help = "number of cylinders (ide disk geometry)", 618 },{ 619 .name = "heads", 620 .type = QEMU_OPT_NUMBER, 621 .help = "number of heads (ide disk geometry)", 622 },{ 623 .name = "secs", 624 .type = QEMU_OPT_NUMBER, 625 .help = "number of sectors (ide disk geometry)", 626 },{ 627 .name = "trans", 628 .type = QEMU_OPT_STRING, 629 .help = "chs translation (auto, lba, none)", 630 },{ 631 .name = "boot", 632 .type = QEMU_OPT_BOOL, 633 .help = "(deprecated, ignored)", 634 },{ 635 .name = "addr", 636 .type = QEMU_OPT_STRING, 637 .help = "pci address (virtio only)", 638 },{ 639 .name = "serial", 640 .type = QEMU_OPT_STRING, 641 .help = "disk serial number", 642 },{ 643 .name = "file", 644 .type = QEMU_OPT_STRING, 645 .help = "file name", 646 }, 647 648 /* Options that are passed on, but have special semantics with -drive */ 649 { 650 .name = "read-only", 651 .type = QEMU_OPT_BOOL, 652 .help = "open drive file as read-only", 653 },{ 654 .name = "rerror", 655 .type = QEMU_OPT_STRING, 656 .help = "read error action", 657 },{ 658 .name = "werror", 659 .type = QEMU_OPT_STRING, 660 .help = "write error action", 661 },{ 662 .name = "copy-on-read", 663 .type = QEMU_OPT_BOOL, 664 .help = "copy read data from backing file into image file", 665 }, 666 667 { /* end of list */ } 668 }, 669 }; 670 671 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 672 { 673 const char *value; 674 BlockBackend *blk; 675 DriveInfo *dinfo = NULL; 676 QDict *bs_opts; 677 QemuOpts *legacy_opts; 678 DriveMediaType media = MEDIA_DISK; 679 BlockInterfaceType type; 680 int cyls, heads, secs, translation; 681 int max_devs, bus_id, unit_id, index; 682 const char *devaddr; 683 const char *werror, *rerror; 684 bool read_only = false; 685 bool copy_on_read; 686 const char *serial; 687 const char *filename; 688 Error *local_err = NULL; 689 int i; 690 691 /* Change legacy command line options into QMP ones */ 692 static const struct { 693 const char *from; 694 const char *to; 695 } opt_renames[] = { 696 { "iops", "throttling.iops-total" }, 697 { "iops_rd", "throttling.iops-read" }, 698 { "iops_wr", "throttling.iops-write" }, 699 700 { "bps", "throttling.bps-total" }, 701 { "bps_rd", "throttling.bps-read" }, 702 { "bps_wr", "throttling.bps-write" }, 703 704 { "iops_max", "throttling.iops-total-max" }, 705 { "iops_rd_max", "throttling.iops-read-max" }, 706 { "iops_wr_max", "throttling.iops-write-max" }, 707 708 { "bps_max", "throttling.bps-total-max" }, 709 { "bps_rd_max", "throttling.bps-read-max" }, 710 { "bps_wr_max", "throttling.bps-write-max" }, 711 712 { "iops_size", "throttling.iops-size" }, 713 714 { "readonly", "read-only" }, 715 }; 716 717 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 718 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 719 &local_err); 720 if (local_err) { 721 error_report_err(local_err); 722 return NULL; 723 } 724 } 725 726 value = qemu_opt_get(all_opts, "cache"); 727 if (value) { 728 int flags = 0; 729 730 if (bdrv_parse_cache_flags(value, &flags) != 0) { 731 error_report("invalid cache option"); 732 return NULL; 733 } 734 735 /* Specific options take precedence */ 736 if (!qemu_opt_get(all_opts, "cache.writeback")) { 737 qemu_opt_set_bool(all_opts, "cache.writeback", 738 !!(flags & BDRV_O_CACHE_WB), &error_abort); 739 } 740 if (!qemu_opt_get(all_opts, "cache.direct")) { 741 qemu_opt_set_bool(all_opts, "cache.direct", 742 !!(flags & BDRV_O_NOCACHE), &error_abort); 743 } 744 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 745 qemu_opt_set_bool(all_opts, "cache.no-flush", 746 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 747 } 748 qemu_opt_unset(all_opts, "cache"); 749 } 750 751 /* Get a QDict for processing the options */ 752 bs_opts = qdict_new(); 753 qemu_opts_to_qdict(all_opts, bs_opts); 754 755 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 756 &error_abort); 757 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 758 if (local_err) { 759 error_report_err(local_err); 760 goto fail; 761 } 762 763 /* Deprecated option boot=[on|off] */ 764 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 765 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 766 "ignored. Future versions will reject this parameter. Please " 767 "update your scripts.\n"); 768 } 769 770 /* Media type */ 771 value = qemu_opt_get(legacy_opts, "media"); 772 if (value) { 773 if (!strcmp(value, "disk")) { 774 media = MEDIA_DISK; 775 } else if (!strcmp(value, "cdrom")) { 776 media = MEDIA_CDROM; 777 read_only = true; 778 } else { 779 error_report("'%s' invalid media", value); 780 goto fail; 781 } 782 } 783 784 /* copy-on-read is disabled with a warning for read-only devices */ 785 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 786 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 787 788 if (read_only && copy_on_read) { 789 error_report("warning: disabling copy-on-read on read-only drive"); 790 copy_on_read = false; 791 } 792 793 qdict_put(bs_opts, "read-only", 794 qstring_from_str(read_only ? "on" : "off")); 795 qdict_put(bs_opts, "copy-on-read", 796 qstring_from_str(copy_on_read ? "on" :"off")); 797 798 /* Controller type */ 799 value = qemu_opt_get(legacy_opts, "if"); 800 if (value) { 801 for (type = 0; 802 type < IF_COUNT && strcmp(value, if_name[type]); 803 type++) { 804 } 805 if (type == IF_COUNT) { 806 error_report("unsupported bus type '%s'", value); 807 goto fail; 808 } 809 } else { 810 type = block_default_type; 811 } 812 813 /* Geometry */ 814 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 815 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 816 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 817 818 if (cyls || heads || secs) { 819 if (cyls < 1) { 820 error_report("invalid physical cyls number"); 821 goto fail; 822 } 823 if (heads < 1) { 824 error_report("invalid physical heads number"); 825 goto fail; 826 } 827 if (secs < 1) { 828 error_report("invalid physical secs number"); 829 goto fail; 830 } 831 } 832 833 translation = BIOS_ATA_TRANSLATION_AUTO; 834 value = qemu_opt_get(legacy_opts, "trans"); 835 if (value != NULL) { 836 if (!cyls) { 837 error_report("'%s' trans must be used with cyls, heads and secs", 838 value); 839 goto fail; 840 } 841 if (!strcmp(value, "none")) { 842 translation = BIOS_ATA_TRANSLATION_NONE; 843 } else if (!strcmp(value, "lba")) { 844 translation = BIOS_ATA_TRANSLATION_LBA; 845 } else if (!strcmp(value, "large")) { 846 translation = BIOS_ATA_TRANSLATION_LARGE; 847 } else if (!strcmp(value, "rechs")) { 848 translation = BIOS_ATA_TRANSLATION_RECHS; 849 } else if (!strcmp(value, "auto")) { 850 translation = BIOS_ATA_TRANSLATION_AUTO; 851 } else { 852 error_report("'%s' invalid translation type", value); 853 goto fail; 854 } 855 } 856 857 if (media == MEDIA_CDROM) { 858 if (cyls || secs || heads) { 859 error_report("CHS can't be set with media=cdrom"); 860 goto fail; 861 } 862 } 863 864 /* Device address specified by bus/unit or index. 865 * If none was specified, try to find the first free one. */ 866 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 867 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 868 index = qemu_opt_get_number(legacy_opts, "index", -1); 869 870 max_devs = if_max_devs[type]; 871 872 if (index != -1) { 873 if (bus_id != 0 || unit_id != -1) { 874 error_report("index cannot be used with bus and unit"); 875 goto fail; 876 } 877 bus_id = drive_index_to_bus_id(type, index); 878 unit_id = drive_index_to_unit_id(type, index); 879 } 880 881 if (unit_id == -1) { 882 unit_id = 0; 883 while (drive_get(type, bus_id, unit_id) != NULL) { 884 unit_id++; 885 if (max_devs && unit_id >= max_devs) { 886 unit_id -= max_devs; 887 bus_id++; 888 } 889 } 890 } 891 892 if (max_devs && unit_id >= max_devs) { 893 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 894 goto fail; 895 } 896 897 if (drive_get(type, bus_id, unit_id) != NULL) { 898 error_report("drive with bus=%d, unit=%d (index=%d) exists", 899 bus_id, unit_id, index); 900 goto fail; 901 } 902 903 /* Serial number */ 904 serial = qemu_opt_get(legacy_opts, "serial"); 905 906 /* no id supplied -> create one */ 907 if (qemu_opts_id(all_opts) == NULL) { 908 char *new_id; 909 const char *mediastr = ""; 910 if (type == IF_IDE || type == IF_SCSI) { 911 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 912 } 913 if (max_devs) { 914 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 915 mediastr, unit_id); 916 } else { 917 new_id = g_strdup_printf("%s%s%i", if_name[type], 918 mediastr, unit_id); 919 } 920 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 921 g_free(new_id); 922 } 923 924 /* Add virtio block device */ 925 devaddr = qemu_opt_get(legacy_opts, "addr"); 926 if (devaddr && type != IF_VIRTIO) { 927 error_report("addr is not supported by this bus type"); 928 goto fail; 929 } 930 931 if (type == IF_VIRTIO) { 932 QemuOpts *devopts; 933 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 934 &error_abort); 935 if (arch_type == QEMU_ARCH_S390X) { 936 qemu_opt_set(devopts, "driver", "virtio-blk-s390", &error_abort); 937 } else { 938 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 939 } 940 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 941 &error_abort); 942 if (devaddr) { 943 qemu_opt_set(devopts, "addr", devaddr, &error_abort); 944 } 945 } 946 947 filename = qemu_opt_get(legacy_opts, "file"); 948 949 /* Check werror/rerror compatibility with if=... */ 950 werror = qemu_opt_get(legacy_opts, "werror"); 951 if (werror != NULL) { 952 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 953 type != IF_NONE) { 954 error_report("werror is not supported by this bus type"); 955 goto fail; 956 } 957 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 958 } 959 960 rerror = qemu_opt_get(legacy_opts, "rerror"); 961 if (rerror != NULL) { 962 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 963 type != IF_NONE) { 964 error_report("rerror is not supported by this bus type"); 965 goto fail; 966 } 967 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 968 } 969 970 /* Actual block device init: Functionality shared with blockdev-add */ 971 blk = blockdev_init(filename, bs_opts, &local_err); 972 bs_opts = NULL; 973 if (!blk) { 974 if (local_err) { 975 error_report_err(local_err); 976 } 977 goto fail; 978 } else { 979 assert(!local_err); 980 } 981 982 /* Create legacy DriveInfo */ 983 dinfo = g_malloc0(sizeof(*dinfo)); 984 dinfo->opts = all_opts; 985 986 dinfo->cyls = cyls; 987 dinfo->heads = heads; 988 dinfo->secs = secs; 989 dinfo->trans = translation; 990 991 dinfo->type = type; 992 dinfo->bus = bus_id; 993 dinfo->unit = unit_id; 994 dinfo->devaddr = devaddr; 995 dinfo->serial = g_strdup(serial); 996 997 blk_set_legacy_dinfo(blk, dinfo); 998 999 switch(type) { 1000 case IF_IDE: 1001 case IF_SCSI: 1002 case IF_XEN: 1003 case IF_NONE: 1004 dinfo->media_cd = media == MEDIA_CDROM; 1005 break; 1006 default: 1007 break; 1008 } 1009 1010 fail: 1011 qemu_opts_del(legacy_opts); 1012 QDECREF(bs_opts); 1013 return dinfo; 1014 } 1015 1016 void hmp_commit(Monitor *mon, const QDict *qdict) 1017 { 1018 const char *device = qdict_get_str(qdict, "device"); 1019 BlockBackend *blk; 1020 int ret; 1021 1022 if (!strcmp(device, "all")) { 1023 ret = bdrv_commit_all(); 1024 } else { 1025 blk = blk_by_name(device); 1026 if (!blk) { 1027 monitor_printf(mon, "Device '%s' not found\n", device); 1028 return; 1029 } 1030 ret = bdrv_commit(blk_bs(blk)); 1031 } 1032 if (ret < 0) { 1033 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1034 strerror(-ret)); 1035 } 1036 } 1037 1038 static void blockdev_do_action(int kind, void *data, Error **errp) 1039 { 1040 TransactionAction action; 1041 TransactionActionList list; 1042 1043 action.kind = kind; 1044 action.data = data; 1045 list.value = &action; 1046 list.next = NULL; 1047 qmp_transaction(&list, errp); 1048 } 1049 1050 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1051 bool has_node_name, const char *node_name, 1052 const char *snapshot_file, 1053 bool has_snapshot_node_name, 1054 const char *snapshot_node_name, 1055 bool has_format, const char *format, 1056 bool has_mode, NewImageMode mode, Error **errp) 1057 { 1058 BlockdevSnapshot snapshot = { 1059 .has_device = has_device, 1060 .device = (char *) device, 1061 .has_node_name = has_node_name, 1062 .node_name = (char *) node_name, 1063 .snapshot_file = (char *) snapshot_file, 1064 .has_snapshot_node_name = has_snapshot_node_name, 1065 .snapshot_node_name = (char *) snapshot_node_name, 1066 .has_format = has_format, 1067 .format = (char *) format, 1068 .has_mode = has_mode, 1069 .mode = mode, 1070 }; 1071 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1072 &snapshot, errp); 1073 } 1074 1075 void qmp_blockdev_snapshot_internal_sync(const char *device, 1076 const char *name, 1077 Error **errp) 1078 { 1079 BlockdevSnapshotInternal snapshot = { 1080 .device = (char *) device, 1081 .name = (char *) name 1082 }; 1083 1084 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1085 &snapshot, errp); 1086 } 1087 1088 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1089 bool has_id, 1090 const char *id, 1091 bool has_name, 1092 const char *name, 1093 Error **errp) 1094 { 1095 BlockDriverState *bs; 1096 BlockBackend *blk; 1097 AioContext *aio_context; 1098 QEMUSnapshotInfo sn; 1099 Error *local_err = NULL; 1100 SnapshotInfo *info = NULL; 1101 int ret; 1102 1103 blk = blk_by_name(device); 1104 if (!blk) { 1105 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1106 return NULL; 1107 } 1108 bs = blk_bs(blk); 1109 1110 if (!has_id) { 1111 id = NULL; 1112 } 1113 1114 if (!has_name) { 1115 name = NULL; 1116 } 1117 1118 if (!id && !name) { 1119 error_setg(errp, "Name or id must be provided"); 1120 return NULL; 1121 } 1122 1123 aio_context = bdrv_get_aio_context(bs); 1124 aio_context_acquire(aio_context); 1125 1126 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1127 goto out_aio_context; 1128 } 1129 1130 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1131 if (local_err) { 1132 error_propagate(errp, local_err); 1133 goto out_aio_context; 1134 } 1135 if (!ret) { 1136 error_setg(errp, 1137 "Snapshot with id '%s' and name '%s' does not exist on " 1138 "device '%s'", 1139 STR_OR_NULL(id), STR_OR_NULL(name), device); 1140 goto out_aio_context; 1141 } 1142 1143 bdrv_snapshot_delete(bs, id, name, &local_err); 1144 if (local_err) { 1145 error_propagate(errp, local_err); 1146 goto out_aio_context; 1147 } 1148 1149 aio_context_release(aio_context); 1150 1151 info = g_new0(SnapshotInfo, 1); 1152 info->id = g_strdup(sn.id_str); 1153 info->name = g_strdup(sn.name); 1154 info->date_nsec = sn.date_nsec; 1155 info->date_sec = sn.date_sec; 1156 info->vm_state_size = sn.vm_state_size; 1157 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1158 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1159 1160 return info; 1161 1162 out_aio_context: 1163 aio_context_release(aio_context); 1164 return NULL; 1165 } 1166 1167 /** 1168 * block_dirty_bitmap_lookup: 1169 * Return a dirty bitmap (if present), after validating 1170 * the node reference and bitmap names. 1171 * 1172 * @node: The name of the BDS node to search for bitmaps 1173 * @name: The name of the bitmap to search for 1174 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1175 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL. 1176 * @errp: Output pointer for error information. Can be NULL. 1177 * 1178 * @return: A bitmap object on success, or NULL on failure. 1179 */ 1180 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1181 const char *name, 1182 BlockDriverState **pbs, 1183 AioContext **paio, 1184 Error **errp) 1185 { 1186 BlockDriverState *bs; 1187 BdrvDirtyBitmap *bitmap; 1188 AioContext *aio_context; 1189 1190 if (!node) { 1191 error_setg(errp, "Node cannot be NULL"); 1192 return NULL; 1193 } 1194 if (!name) { 1195 error_setg(errp, "Bitmap name cannot be NULL"); 1196 return NULL; 1197 } 1198 bs = bdrv_lookup_bs(node, node, NULL); 1199 if (!bs) { 1200 error_setg(errp, "Node '%s' not found", node); 1201 return NULL; 1202 } 1203 1204 aio_context = bdrv_get_aio_context(bs); 1205 aio_context_acquire(aio_context); 1206 1207 bitmap = bdrv_find_dirty_bitmap(bs, name); 1208 if (!bitmap) { 1209 error_setg(errp, "Dirty bitmap '%s' not found", name); 1210 goto fail; 1211 } 1212 1213 if (pbs) { 1214 *pbs = bs; 1215 } 1216 if (paio) { 1217 *paio = aio_context; 1218 } else { 1219 aio_context_release(aio_context); 1220 } 1221 1222 return bitmap; 1223 1224 fail: 1225 aio_context_release(aio_context); 1226 return NULL; 1227 } 1228 1229 /* New and old BlockDriverState structs for atomic group operations */ 1230 1231 typedef struct BlkTransactionState BlkTransactionState; 1232 1233 /* Only prepare() may fail. In a single transaction, only one of commit() or 1234 abort() will be called, clean() will always be called if it present. */ 1235 typedef struct BdrvActionOps { 1236 /* Size of state struct, in bytes. */ 1237 size_t instance_size; 1238 /* Prepare the work, must NOT be NULL. */ 1239 void (*prepare)(BlkTransactionState *common, Error **errp); 1240 /* Commit the changes, can be NULL. */ 1241 void (*commit)(BlkTransactionState *common); 1242 /* Abort the changes on fail, can be NULL. */ 1243 void (*abort)(BlkTransactionState *common); 1244 /* Clean up resource in the end, can be NULL. */ 1245 void (*clean)(BlkTransactionState *common); 1246 } BdrvActionOps; 1247 1248 /* 1249 * This structure must be arranged as first member in child type, assuming 1250 * that compiler will also arrange it to the same address with parent instance. 1251 * Later it will be used in free(). 1252 */ 1253 struct BlkTransactionState { 1254 TransactionAction *action; 1255 const BdrvActionOps *ops; 1256 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1257 }; 1258 1259 /* internal snapshot private data */ 1260 typedef struct InternalSnapshotState { 1261 BlkTransactionState common; 1262 BlockDriverState *bs; 1263 AioContext *aio_context; 1264 QEMUSnapshotInfo sn; 1265 } InternalSnapshotState; 1266 1267 static void internal_snapshot_prepare(BlkTransactionState *common, 1268 Error **errp) 1269 { 1270 Error *local_err = NULL; 1271 const char *device; 1272 const char *name; 1273 BlockBackend *blk; 1274 BlockDriverState *bs; 1275 QEMUSnapshotInfo old_sn, *sn; 1276 bool ret; 1277 qemu_timeval tv; 1278 BlockdevSnapshotInternal *internal; 1279 InternalSnapshotState *state; 1280 int ret1; 1281 1282 g_assert(common->action->kind == 1283 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1284 internal = common->action->blockdev_snapshot_internal_sync; 1285 state = DO_UPCAST(InternalSnapshotState, common, common); 1286 1287 /* 1. parse input */ 1288 device = internal->device; 1289 name = internal->name; 1290 1291 /* 2. check for validation */ 1292 blk = blk_by_name(device); 1293 if (!blk) { 1294 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1295 return; 1296 } 1297 bs = blk_bs(blk); 1298 1299 /* AioContext is released in .clean() */ 1300 state->aio_context = bdrv_get_aio_context(bs); 1301 aio_context_acquire(state->aio_context); 1302 1303 if (!bdrv_is_inserted(bs)) { 1304 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1305 return; 1306 } 1307 1308 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1309 return; 1310 } 1311 1312 if (bdrv_is_read_only(bs)) { 1313 error_setg(errp, "Device '%s' is read only", device); 1314 return; 1315 } 1316 1317 if (!bdrv_can_snapshot(bs)) { 1318 error_setg(errp, "Block format '%s' used by device '%s' " 1319 "does not support internal snapshots", 1320 bs->drv->format_name, device); 1321 return; 1322 } 1323 1324 if (!strlen(name)) { 1325 error_setg(errp, "Name is empty"); 1326 return; 1327 } 1328 1329 /* check whether a snapshot with name exist */ 1330 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1331 &local_err); 1332 if (local_err) { 1333 error_propagate(errp, local_err); 1334 return; 1335 } else if (ret) { 1336 error_setg(errp, 1337 "Snapshot with name '%s' already exists on device '%s'", 1338 name, device); 1339 return; 1340 } 1341 1342 /* 3. take the snapshot */ 1343 sn = &state->sn; 1344 pstrcpy(sn->name, sizeof(sn->name), name); 1345 qemu_gettimeofday(&tv); 1346 sn->date_sec = tv.tv_sec; 1347 sn->date_nsec = tv.tv_usec * 1000; 1348 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1349 1350 ret1 = bdrv_snapshot_create(bs, sn); 1351 if (ret1 < 0) { 1352 error_setg_errno(errp, -ret1, 1353 "Failed to create snapshot '%s' on device '%s'", 1354 name, device); 1355 return; 1356 } 1357 1358 /* 4. succeed, mark a snapshot is created */ 1359 state->bs = bs; 1360 } 1361 1362 static void internal_snapshot_abort(BlkTransactionState *common) 1363 { 1364 InternalSnapshotState *state = 1365 DO_UPCAST(InternalSnapshotState, common, common); 1366 BlockDriverState *bs = state->bs; 1367 QEMUSnapshotInfo *sn = &state->sn; 1368 Error *local_error = NULL; 1369 1370 if (!bs) { 1371 return; 1372 } 1373 1374 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1375 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1376 "device '%s' in abort: %s", 1377 sn->id_str, 1378 sn->name, 1379 bdrv_get_device_name(bs), 1380 error_get_pretty(local_error)); 1381 error_free(local_error); 1382 } 1383 } 1384 1385 static void internal_snapshot_clean(BlkTransactionState *common) 1386 { 1387 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1388 common, common); 1389 1390 if (state->aio_context) { 1391 aio_context_release(state->aio_context); 1392 } 1393 } 1394 1395 /* external snapshot private data */ 1396 typedef struct ExternalSnapshotState { 1397 BlkTransactionState common; 1398 BlockDriverState *old_bs; 1399 BlockDriverState *new_bs; 1400 AioContext *aio_context; 1401 } ExternalSnapshotState; 1402 1403 static void external_snapshot_prepare(BlkTransactionState *common, 1404 Error **errp) 1405 { 1406 BlockDriver *drv; 1407 int flags, ret; 1408 QDict *options = NULL; 1409 Error *local_err = NULL; 1410 bool has_device = false; 1411 const char *device; 1412 bool has_node_name = false; 1413 const char *node_name; 1414 bool has_snapshot_node_name = false; 1415 const char *snapshot_node_name; 1416 const char *new_image_file; 1417 const char *format = "qcow2"; 1418 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1419 ExternalSnapshotState *state = 1420 DO_UPCAST(ExternalSnapshotState, common, common); 1421 TransactionAction *action = common->action; 1422 1423 /* get parameters */ 1424 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1425 1426 has_device = action->blockdev_snapshot_sync->has_device; 1427 device = action->blockdev_snapshot_sync->device; 1428 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1429 node_name = action->blockdev_snapshot_sync->node_name; 1430 has_snapshot_node_name = 1431 action->blockdev_snapshot_sync->has_snapshot_node_name; 1432 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1433 1434 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1435 if (action->blockdev_snapshot_sync->has_format) { 1436 format = action->blockdev_snapshot_sync->format; 1437 } 1438 if (action->blockdev_snapshot_sync->has_mode) { 1439 mode = action->blockdev_snapshot_sync->mode; 1440 } 1441 1442 /* start processing */ 1443 drv = bdrv_find_format(format); 1444 if (!drv) { 1445 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1446 return; 1447 } 1448 1449 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1450 has_node_name ? node_name : NULL, 1451 &local_err); 1452 if (local_err) { 1453 error_propagate(errp, local_err); 1454 return; 1455 } 1456 1457 if (has_node_name && !has_snapshot_node_name) { 1458 error_setg(errp, "New snapshot node name missing"); 1459 return; 1460 } 1461 1462 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1463 error_setg(errp, "New snapshot node name already existing"); 1464 return; 1465 } 1466 1467 /* Acquire AioContext now so any threads operating on old_bs stop */ 1468 state->aio_context = bdrv_get_aio_context(state->old_bs); 1469 aio_context_acquire(state->aio_context); 1470 1471 if (!bdrv_is_inserted(state->old_bs)) { 1472 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1473 return; 1474 } 1475 1476 if (bdrv_op_is_blocked(state->old_bs, 1477 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1478 return; 1479 } 1480 1481 if (!bdrv_is_read_only(state->old_bs)) { 1482 if (bdrv_flush(state->old_bs)) { 1483 error_set(errp, QERR_IO_ERROR); 1484 return; 1485 } 1486 } 1487 1488 if (!bdrv_is_first_non_filter(state->old_bs)) { 1489 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1490 return; 1491 } 1492 1493 flags = state->old_bs->open_flags; 1494 1495 /* create new image w/backing file */ 1496 if (mode != NEW_IMAGE_MODE_EXISTING) { 1497 bdrv_img_create(new_image_file, format, 1498 state->old_bs->filename, 1499 state->old_bs->drv->format_name, 1500 NULL, -1, flags, &local_err, false); 1501 if (local_err) { 1502 error_propagate(errp, local_err); 1503 return; 1504 } 1505 } 1506 1507 if (has_snapshot_node_name) { 1508 options = qdict_new(); 1509 qdict_put(options, "node-name", 1510 qstring_from_str(snapshot_node_name)); 1511 } 1512 1513 /* TODO Inherit bs->options or only take explicit options with an 1514 * extended QMP command? */ 1515 assert(state->new_bs == NULL); 1516 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1517 flags | BDRV_O_NO_BACKING, drv, &local_err); 1518 /* We will manually add the backing_hd field to the bs later */ 1519 if (ret != 0) { 1520 error_propagate(errp, local_err); 1521 } 1522 } 1523 1524 static void external_snapshot_commit(BlkTransactionState *common) 1525 { 1526 ExternalSnapshotState *state = 1527 DO_UPCAST(ExternalSnapshotState, common, common); 1528 1529 bdrv_set_aio_context(state->new_bs, state->aio_context); 1530 1531 /* This removes our old bs and adds the new bs */ 1532 bdrv_append(state->new_bs, state->old_bs); 1533 /* We don't need (or want) to use the transactional 1534 * bdrv_reopen_multiple() across all the entries at once, because we 1535 * don't want to abort all of them if one of them fails the reopen */ 1536 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1537 NULL); 1538 1539 aio_context_release(state->aio_context); 1540 } 1541 1542 static void external_snapshot_abort(BlkTransactionState *common) 1543 { 1544 ExternalSnapshotState *state = 1545 DO_UPCAST(ExternalSnapshotState, common, common); 1546 if (state->new_bs) { 1547 bdrv_unref(state->new_bs); 1548 } 1549 if (state->aio_context) { 1550 aio_context_release(state->aio_context); 1551 } 1552 } 1553 1554 typedef struct DriveBackupState { 1555 BlkTransactionState common; 1556 BlockDriverState *bs; 1557 AioContext *aio_context; 1558 BlockJob *job; 1559 } DriveBackupState; 1560 1561 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1562 { 1563 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1564 BlockDriverState *bs; 1565 BlockBackend *blk; 1566 DriveBackup *backup; 1567 Error *local_err = NULL; 1568 1569 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1570 backup = common->action->drive_backup; 1571 1572 blk = blk_by_name(backup->device); 1573 if (!blk) { 1574 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device); 1575 return; 1576 } 1577 bs = blk_bs(blk); 1578 1579 /* AioContext is released in .clean() */ 1580 state->aio_context = bdrv_get_aio_context(bs); 1581 aio_context_acquire(state->aio_context); 1582 1583 qmp_drive_backup(backup->device, backup->target, 1584 backup->has_format, backup->format, 1585 backup->sync, 1586 backup->has_mode, backup->mode, 1587 backup->has_speed, backup->speed, 1588 backup->has_on_source_error, backup->on_source_error, 1589 backup->has_on_target_error, backup->on_target_error, 1590 &local_err); 1591 if (local_err) { 1592 error_propagate(errp, local_err); 1593 return; 1594 } 1595 1596 state->bs = bs; 1597 state->job = state->bs->job; 1598 } 1599 1600 static void drive_backup_abort(BlkTransactionState *common) 1601 { 1602 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1603 BlockDriverState *bs = state->bs; 1604 1605 /* Only cancel if it's the job we started */ 1606 if (bs && bs->job && bs->job == state->job) { 1607 block_job_cancel_sync(bs->job); 1608 } 1609 } 1610 1611 static void drive_backup_clean(BlkTransactionState *common) 1612 { 1613 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1614 1615 if (state->aio_context) { 1616 aio_context_release(state->aio_context); 1617 } 1618 } 1619 1620 typedef struct BlockdevBackupState { 1621 BlkTransactionState common; 1622 BlockDriverState *bs; 1623 BlockJob *job; 1624 AioContext *aio_context; 1625 } BlockdevBackupState; 1626 1627 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1628 { 1629 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1630 BlockdevBackup *backup; 1631 BlockDriverState *bs, *target; 1632 BlockBackend *blk; 1633 Error *local_err = NULL; 1634 1635 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1636 backup = common->action->blockdev_backup; 1637 1638 blk = blk_by_name(backup->device); 1639 if (!blk) { 1640 error_setg(errp, "Device '%s' not found", backup->device); 1641 return; 1642 } 1643 bs = blk_bs(blk); 1644 1645 blk = blk_by_name(backup->target); 1646 if (!blk) { 1647 error_setg(errp, "Device '%s' not found", backup->target); 1648 return; 1649 } 1650 target = blk_bs(blk); 1651 1652 /* AioContext is released in .clean() */ 1653 state->aio_context = bdrv_get_aio_context(bs); 1654 if (state->aio_context != bdrv_get_aio_context(target)) { 1655 state->aio_context = NULL; 1656 error_setg(errp, "Backup between two IO threads is not implemented"); 1657 return; 1658 } 1659 aio_context_acquire(state->aio_context); 1660 1661 qmp_blockdev_backup(backup->device, backup->target, 1662 backup->sync, 1663 backup->has_speed, backup->speed, 1664 backup->has_on_source_error, backup->on_source_error, 1665 backup->has_on_target_error, backup->on_target_error, 1666 &local_err); 1667 if (local_err) { 1668 error_propagate(errp, local_err); 1669 return; 1670 } 1671 1672 state->bs = bs; 1673 state->job = state->bs->job; 1674 } 1675 1676 static void blockdev_backup_abort(BlkTransactionState *common) 1677 { 1678 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1679 BlockDriverState *bs = state->bs; 1680 1681 /* Only cancel if it's the job we started */ 1682 if (bs && bs->job && bs->job == state->job) { 1683 block_job_cancel_sync(bs->job); 1684 } 1685 } 1686 1687 static void blockdev_backup_clean(BlkTransactionState *common) 1688 { 1689 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1690 1691 if (state->aio_context) { 1692 aio_context_release(state->aio_context); 1693 } 1694 } 1695 1696 static void abort_prepare(BlkTransactionState *common, Error **errp) 1697 { 1698 error_setg(errp, "Transaction aborted using Abort action"); 1699 } 1700 1701 static void abort_commit(BlkTransactionState *common) 1702 { 1703 g_assert_not_reached(); /* this action never succeeds */ 1704 } 1705 1706 static const BdrvActionOps actions[] = { 1707 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1708 .instance_size = sizeof(ExternalSnapshotState), 1709 .prepare = external_snapshot_prepare, 1710 .commit = external_snapshot_commit, 1711 .abort = external_snapshot_abort, 1712 }, 1713 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1714 .instance_size = sizeof(DriveBackupState), 1715 .prepare = drive_backup_prepare, 1716 .abort = drive_backup_abort, 1717 .clean = drive_backup_clean, 1718 }, 1719 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1720 .instance_size = sizeof(BlockdevBackupState), 1721 .prepare = blockdev_backup_prepare, 1722 .abort = blockdev_backup_abort, 1723 .clean = blockdev_backup_clean, 1724 }, 1725 [TRANSACTION_ACTION_KIND_ABORT] = { 1726 .instance_size = sizeof(BlkTransactionState), 1727 .prepare = abort_prepare, 1728 .commit = abort_commit, 1729 }, 1730 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1731 .instance_size = sizeof(InternalSnapshotState), 1732 .prepare = internal_snapshot_prepare, 1733 .abort = internal_snapshot_abort, 1734 .clean = internal_snapshot_clean, 1735 }, 1736 }; 1737 1738 /* 1739 * 'Atomic' group operations. The operations are performed as a set, and if 1740 * any fail then we roll back all operations in the group. 1741 */ 1742 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1743 { 1744 TransactionActionList *dev_entry = dev_list; 1745 BlkTransactionState *state, *next; 1746 Error *local_err = NULL; 1747 1748 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1749 QSIMPLEQ_INIT(&snap_bdrv_states); 1750 1751 /* drain all i/o before any operations */ 1752 bdrv_drain_all(); 1753 1754 /* We don't do anything in this loop that commits us to the operations */ 1755 while (NULL != dev_entry) { 1756 TransactionAction *dev_info = NULL; 1757 const BdrvActionOps *ops; 1758 1759 dev_info = dev_entry->value; 1760 dev_entry = dev_entry->next; 1761 1762 assert(dev_info->kind < ARRAY_SIZE(actions)); 1763 1764 ops = &actions[dev_info->kind]; 1765 assert(ops->instance_size > 0); 1766 1767 state = g_malloc0(ops->instance_size); 1768 state->ops = ops; 1769 state->action = dev_info; 1770 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1771 1772 state->ops->prepare(state, &local_err); 1773 if (local_err) { 1774 error_propagate(errp, local_err); 1775 goto delete_and_fail; 1776 } 1777 } 1778 1779 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1780 if (state->ops->commit) { 1781 state->ops->commit(state); 1782 } 1783 } 1784 1785 /* success */ 1786 goto exit; 1787 1788 delete_and_fail: 1789 /* failure, and it is all-or-none; roll back all operations */ 1790 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1791 if (state->ops->abort) { 1792 state->ops->abort(state); 1793 } 1794 } 1795 exit: 1796 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1797 if (state->ops->clean) { 1798 state->ops->clean(state); 1799 } 1800 g_free(state); 1801 } 1802 } 1803 1804 1805 static void eject_device(BlockBackend *blk, int force, Error **errp) 1806 { 1807 BlockDriverState *bs = blk_bs(blk); 1808 AioContext *aio_context; 1809 1810 aio_context = bdrv_get_aio_context(bs); 1811 aio_context_acquire(aio_context); 1812 1813 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1814 goto out; 1815 } 1816 if (!blk_dev_has_removable_media(blk)) { 1817 error_setg(errp, "Device '%s' is not removable", 1818 bdrv_get_device_name(bs)); 1819 goto out; 1820 } 1821 1822 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1823 blk_dev_eject_request(blk, force); 1824 if (!force) { 1825 error_setg(errp, "Device '%s' is locked", 1826 bdrv_get_device_name(bs)); 1827 goto out; 1828 } 1829 } 1830 1831 bdrv_close(bs); 1832 1833 out: 1834 aio_context_release(aio_context); 1835 } 1836 1837 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1838 { 1839 BlockBackend *blk; 1840 1841 blk = blk_by_name(device); 1842 if (!blk) { 1843 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1844 return; 1845 } 1846 1847 eject_device(blk, force, errp); 1848 } 1849 1850 void qmp_block_passwd(bool has_device, const char *device, 1851 bool has_node_name, const char *node_name, 1852 const char *password, Error **errp) 1853 { 1854 Error *local_err = NULL; 1855 BlockDriverState *bs; 1856 AioContext *aio_context; 1857 1858 bs = bdrv_lookup_bs(has_device ? device : NULL, 1859 has_node_name ? node_name : NULL, 1860 &local_err); 1861 if (local_err) { 1862 error_propagate(errp, local_err); 1863 return; 1864 } 1865 1866 aio_context = bdrv_get_aio_context(bs); 1867 aio_context_acquire(aio_context); 1868 1869 bdrv_add_key(bs, password, errp); 1870 1871 aio_context_release(aio_context); 1872 } 1873 1874 /* Assumes AioContext is held */ 1875 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1876 int bdrv_flags, BlockDriver *drv, 1877 const char *password, Error **errp) 1878 { 1879 Error *local_err = NULL; 1880 int ret; 1881 1882 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1883 if (ret < 0) { 1884 error_propagate(errp, local_err); 1885 return; 1886 } 1887 1888 bdrv_add_key(bs, password, errp); 1889 } 1890 1891 void qmp_change_blockdev(const char *device, const char *filename, 1892 const char *format, Error **errp) 1893 { 1894 BlockBackend *blk; 1895 BlockDriverState *bs; 1896 AioContext *aio_context; 1897 BlockDriver *drv = NULL; 1898 int bdrv_flags; 1899 Error *err = NULL; 1900 1901 blk = blk_by_name(device); 1902 if (!blk) { 1903 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1904 return; 1905 } 1906 bs = blk_bs(blk); 1907 1908 aio_context = bdrv_get_aio_context(bs); 1909 aio_context_acquire(aio_context); 1910 1911 if (format) { 1912 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1913 if (!drv) { 1914 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1915 goto out; 1916 } 1917 } 1918 1919 eject_device(blk, 0, &err); 1920 if (err) { 1921 error_propagate(errp, err); 1922 goto out; 1923 } 1924 1925 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1926 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1927 1928 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1929 1930 out: 1931 aio_context_release(aio_context); 1932 } 1933 1934 /* throttling disk I/O limits */ 1935 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1936 int64_t bps_wr, 1937 int64_t iops, 1938 int64_t iops_rd, 1939 int64_t iops_wr, 1940 bool has_bps_max, 1941 int64_t bps_max, 1942 bool has_bps_rd_max, 1943 int64_t bps_rd_max, 1944 bool has_bps_wr_max, 1945 int64_t bps_wr_max, 1946 bool has_iops_max, 1947 int64_t iops_max, 1948 bool has_iops_rd_max, 1949 int64_t iops_rd_max, 1950 bool has_iops_wr_max, 1951 int64_t iops_wr_max, 1952 bool has_iops_size, 1953 int64_t iops_size, Error **errp) 1954 { 1955 ThrottleConfig cfg; 1956 BlockDriverState *bs; 1957 BlockBackend *blk; 1958 AioContext *aio_context; 1959 1960 blk = blk_by_name(device); 1961 if (!blk) { 1962 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1963 return; 1964 } 1965 bs = blk_bs(blk); 1966 1967 memset(&cfg, 0, sizeof(cfg)); 1968 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1969 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1970 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1971 1972 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1973 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1974 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1975 1976 if (has_bps_max) { 1977 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1978 } 1979 if (has_bps_rd_max) { 1980 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1981 } 1982 if (has_bps_wr_max) { 1983 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1984 } 1985 if (has_iops_max) { 1986 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1987 } 1988 if (has_iops_rd_max) { 1989 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1990 } 1991 if (has_iops_wr_max) { 1992 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1993 } 1994 1995 if (has_iops_size) { 1996 cfg.op_size = iops_size; 1997 } 1998 1999 if (!check_throttle_config(&cfg, errp)) { 2000 return; 2001 } 2002 2003 aio_context = bdrv_get_aio_context(bs); 2004 aio_context_acquire(aio_context); 2005 2006 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 2007 bdrv_io_limits_enable(bs); 2008 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 2009 bdrv_io_limits_disable(bs); 2010 } 2011 2012 if (bs->io_limits_enabled) { 2013 bdrv_set_io_limits(bs, &cfg); 2014 } 2015 2016 aio_context_release(aio_context); 2017 } 2018 2019 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2020 bool has_granularity, uint32_t granularity, 2021 Error **errp) 2022 { 2023 AioContext *aio_context; 2024 BlockDriverState *bs; 2025 2026 if (!name || name[0] == '\0') { 2027 error_setg(errp, "Bitmap name cannot be empty"); 2028 return; 2029 } 2030 2031 bs = bdrv_lookup_bs(node, node, errp); 2032 if (!bs) { 2033 return; 2034 } 2035 2036 aio_context = bdrv_get_aio_context(bs); 2037 aio_context_acquire(aio_context); 2038 2039 if (has_granularity) { 2040 if (granularity < 512 || !is_power_of_2(granularity)) { 2041 error_setg(errp, "Granularity must be power of 2 " 2042 "and at least 512"); 2043 goto out; 2044 } 2045 } else { 2046 /* Default to cluster size, if available: */ 2047 granularity = bdrv_get_default_bitmap_granularity(bs); 2048 } 2049 2050 bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2051 2052 out: 2053 aio_context_release(aio_context); 2054 } 2055 2056 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2057 Error **errp) 2058 { 2059 AioContext *aio_context; 2060 BlockDriverState *bs; 2061 BdrvDirtyBitmap *bitmap; 2062 2063 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2064 if (!bitmap || !bs) { 2065 return; 2066 } 2067 2068 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2069 error_setg(errp, 2070 "Bitmap '%s' is currently frozen and cannot be removed", 2071 name); 2072 goto out; 2073 } 2074 bdrv_dirty_bitmap_make_anon(bs, bitmap); 2075 bdrv_release_dirty_bitmap(bs, bitmap); 2076 2077 out: 2078 aio_context_release(aio_context); 2079 } 2080 2081 int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 2082 { 2083 const char *id = qdict_get_str(qdict, "id"); 2084 BlockBackend *blk; 2085 BlockDriverState *bs; 2086 AioContext *aio_context; 2087 Error *local_err = NULL; 2088 2089 blk = blk_by_name(id); 2090 if (!blk) { 2091 error_report("Device '%s' not found", id); 2092 return -1; 2093 } 2094 bs = blk_bs(blk); 2095 2096 if (!blk_legacy_dinfo(blk)) { 2097 error_report("Deleting device added with blockdev-add" 2098 " is not supported"); 2099 return -1; 2100 } 2101 2102 aio_context = bdrv_get_aio_context(bs); 2103 aio_context_acquire(aio_context); 2104 2105 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2106 error_report_err(local_err); 2107 aio_context_release(aio_context); 2108 return -1; 2109 } 2110 2111 /* quiesce block driver; prevent further io */ 2112 bdrv_drain_all(); 2113 bdrv_flush(bs); 2114 bdrv_close(bs); 2115 2116 /* if we have a device attached to this BlockDriverState 2117 * then we need to make the drive anonymous until the device 2118 * can be removed. If this is a drive with no device backing 2119 * then we can just get rid of the block driver state right here. 2120 */ 2121 if (blk_get_attached_dev(blk)) { 2122 blk_hide_on_behalf_of_hmp_drive_del(blk); 2123 /* Further I/O must not pause the guest */ 2124 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 2125 BLOCKDEV_ON_ERROR_REPORT); 2126 } else { 2127 blk_unref(blk); 2128 } 2129 2130 aio_context_release(aio_context); 2131 return 0; 2132 } 2133 2134 void qmp_block_resize(bool has_device, const char *device, 2135 bool has_node_name, const char *node_name, 2136 int64_t size, Error **errp) 2137 { 2138 Error *local_err = NULL; 2139 BlockDriverState *bs; 2140 AioContext *aio_context; 2141 int ret; 2142 2143 bs = bdrv_lookup_bs(has_device ? device : NULL, 2144 has_node_name ? node_name : NULL, 2145 &local_err); 2146 if (local_err) { 2147 error_propagate(errp, local_err); 2148 return; 2149 } 2150 2151 aio_context = bdrv_get_aio_context(bs); 2152 aio_context_acquire(aio_context); 2153 2154 if (!bdrv_is_first_non_filter(bs)) { 2155 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 2156 goto out; 2157 } 2158 2159 if (size < 0) { 2160 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2161 goto out; 2162 } 2163 2164 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2165 error_set(errp, QERR_DEVICE_IN_USE, device); 2166 goto out; 2167 } 2168 2169 /* complete all in-flight operations before resizing the device */ 2170 bdrv_drain_all(); 2171 2172 ret = bdrv_truncate(bs, size); 2173 switch (ret) { 2174 case 0: 2175 break; 2176 case -ENOMEDIUM: 2177 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2178 break; 2179 case -ENOTSUP: 2180 error_set(errp, QERR_UNSUPPORTED); 2181 break; 2182 case -EACCES: 2183 error_setg(errp, "Device '%s' is read only", device); 2184 break; 2185 case -EBUSY: 2186 error_set(errp, QERR_DEVICE_IN_USE, device); 2187 break; 2188 default: 2189 error_setg_errno(errp, -ret, "Could not resize"); 2190 break; 2191 } 2192 2193 out: 2194 aio_context_release(aio_context); 2195 } 2196 2197 static void block_job_cb(void *opaque, int ret) 2198 { 2199 /* Note that this function may be executed from another AioContext besides 2200 * the QEMU main loop. If you need to access anything that assumes the 2201 * QEMU global mutex, use a BH or introduce a mutex. 2202 */ 2203 2204 BlockDriverState *bs = opaque; 2205 const char *msg = NULL; 2206 2207 trace_block_job_cb(bs, bs->job, ret); 2208 2209 assert(bs->job); 2210 2211 if (ret < 0) { 2212 msg = strerror(-ret); 2213 } 2214 2215 if (block_job_is_cancelled(bs->job)) { 2216 block_job_event_cancelled(bs->job); 2217 } else { 2218 block_job_event_completed(bs->job, msg); 2219 } 2220 2221 bdrv_put_ref_bh_schedule(bs); 2222 } 2223 2224 void qmp_block_stream(const char *device, 2225 bool has_base, const char *base, 2226 bool has_backing_file, const char *backing_file, 2227 bool has_speed, int64_t speed, 2228 bool has_on_error, BlockdevOnError on_error, 2229 Error **errp) 2230 { 2231 BlockBackend *blk; 2232 BlockDriverState *bs; 2233 BlockDriverState *base_bs = NULL; 2234 AioContext *aio_context; 2235 Error *local_err = NULL; 2236 const char *base_name = NULL; 2237 2238 if (!has_on_error) { 2239 on_error = BLOCKDEV_ON_ERROR_REPORT; 2240 } 2241 2242 blk = blk_by_name(device); 2243 if (!blk) { 2244 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2245 return; 2246 } 2247 bs = blk_bs(blk); 2248 2249 aio_context = bdrv_get_aio_context(bs); 2250 aio_context_acquire(aio_context); 2251 2252 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2253 goto out; 2254 } 2255 2256 if (has_base) { 2257 base_bs = bdrv_find_backing_image(bs, base); 2258 if (base_bs == NULL) { 2259 error_set(errp, QERR_BASE_NOT_FOUND, base); 2260 goto out; 2261 } 2262 assert(bdrv_get_aio_context(base_bs) == aio_context); 2263 base_name = base; 2264 } 2265 2266 /* if we are streaming the entire chain, the result will have no backing 2267 * file, and specifying one is therefore an error */ 2268 if (base_bs == NULL && has_backing_file) { 2269 error_setg(errp, "backing file specified, but streaming the " 2270 "entire chain"); 2271 goto out; 2272 } 2273 2274 /* backing_file string overrides base bs filename */ 2275 base_name = has_backing_file ? backing_file : base_name; 2276 2277 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2278 on_error, block_job_cb, bs, &local_err); 2279 if (local_err) { 2280 error_propagate(errp, local_err); 2281 goto out; 2282 } 2283 2284 trace_qmp_block_stream(bs, bs->job); 2285 2286 out: 2287 aio_context_release(aio_context); 2288 } 2289 2290 void qmp_block_commit(const char *device, 2291 bool has_base, const char *base, 2292 bool has_top, const char *top, 2293 bool has_backing_file, const char *backing_file, 2294 bool has_speed, int64_t speed, 2295 Error **errp) 2296 { 2297 BlockBackend *blk; 2298 BlockDriverState *bs; 2299 BlockDriverState *base_bs, *top_bs; 2300 AioContext *aio_context; 2301 Error *local_err = NULL; 2302 /* This will be part of the QMP command, if/when the 2303 * BlockdevOnError change for blkmirror makes it in 2304 */ 2305 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2306 2307 if (!has_speed) { 2308 speed = 0; 2309 } 2310 2311 /* Important Note: 2312 * libvirt relies on the DeviceNotFound error class in order to probe for 2313 * live commit feature versions; for this to work, we must make sure to 2314 * perform the device lookup before any generic errors that may occur in a 2315 * scenario in which all optional arguments are omitted. */ 2316 blk = blk_by_name(device); 2317 if (!blk) { 2318 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2319 return; 2320 } 2321 bs = blk_bs(blk); 2322 2323 aio_context = bdrv_get_aio_context(bs); 2324 aio_context_acquire(aio_context); 2325 2326 /* drain all i/o before commits */ 2327 bdrv_drain_all(); 2328 2329 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2330 goto out; 2331 } 2332 2333 /* default top_bs is the active layer */ 2334 top_bs = bs; 2335 2336 if (has_top && top) { 2337 if (strcmp(bs->filename, top) != 0) { 2338 top_bs = bdrv_find_backing_image(bs, top); 2339 } 2340 } 2341 2342 if (top_bs == NULL) { 2343 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2344 goto out; 2345 } 2346 2347 assert(bdrv_get_aio_context(top_bs) == aio_context); 2348 2349 if (has_base && base) { 2350 base_bs = bdrv_find_backing_image(top_bs, base); 2351 } else { 2352 base_bs = bdrv_find_base(top_bs); 2353 } 2354 2355 if (base_bs == NULL) { 2356 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2357 goto out; 2358 } 2359 2360 assert(bdrv_get_aio_context(base_bs) == aio_context); 2361 2362 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2363 goto out; 2364 } 2365 2366 /* Do not allow attempts to commit an image into itself */ 2367 if (top_bs == base_bs) { 2368 error_setg(errp, "cannot commit an image into itself"); 2369 goto out; 2370 } 2371 2372 if (top_bs == bs) { 2373 if (has_backing_file) { 2374 error_setg(errp, "'backing-file' specified," 2375 " but 'top' is the active layer"); 2376 goto out; 2377 } 2378 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2379 bs, &local_err); 2380 } else { 2381 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2382 has_backing_file ? backing_file : NULL, &local_err); 2383 } 2384 if (local_err != NULL) { 2385 error_propagate(errp, local_err); 2386 goto out; 2387 } 2388 2389 out: 2390 aio_context_release(aio_context); 2391 } 2392 2393 void qmp_drive_backup(const char *device, const char *target, 2394 bool has_format, const char *format, 2395 enum MirrorSyncMode sync, 2396 bool has_mode, enum NewImageMode mode, 2397 bool has_speed, int64_t speed, 2398 bool has_on_source_error, BlockdevOnError on_source_error, 2399 bool has_on_target_error, BlockdevOnError on_target_error, 2400 Error **errp) 2401 { 2402 BlockBackend *blk; 2403 BlockDriverState *bs; 2404 BlockDriverState *target_bs; 2405 BlockDriverState *source = NULL; 2406 AioContext *aio_context; 2407 BlockDriver *drv = NULL; 2408 Error *local_err = NULL; 2409 int flags; 2410 int64_t size; 2411 int ret; 2412 2413 if (!has_speed) { 2414 speed = 0; 2415 } 2416 if (!has_on_source_error) { 2417 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2418 } 2419 if (!has_on_target_error) { 2420 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2421 } 2422 if (!has_mode) { 2423 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2424 } 2425 2426 blk = blk_by_name(device); 2427 if (!blk) { 2428 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2429 return; 2430 } 2431 bs = blk_bs(blk); 2432 2433 aio_context = bdrv_get_aio_context(bs); 2434 aio_context_acquire(aio_context); 2435 2436 /* Although backup_run has this check too, we need to use bs->drv below, so 2437 * do an early check redundantly. */ 2438 if (!bdrv_is_inserted(bs)) { 2439 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2440 goto out; 2441 } 2442 2443 if (!has_format) { 2444 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2445 } 2446 if (format) { 2447 drv = bdrv_find_format(format); 2448 if (!drv) { 2449 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2450 goto out; 2451 } 2452 } 2453 2454 /* Early check to avoid creating target */ 2455 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2456 goto out; 2457 } 2458 2459 flags = bs->open_flags | BDRV_O_RDWR; 2460 2461 /* See if we have a backing HD we can use to create our new image 2462 * on top of. */ 2463 if (sync == MIRROR_SYNC_MODE_TOP) { 2464 source = bs->backing_hd; 2465 if (!source) { 2466 sync = MIRROR_SYNC_MODE_FULL; 2467 } 2468 } 2469 if (sync == MIRROR_SYNC_MODE_NONE) { 2470 source = bs; 2471 } 2472 2473 size = bdrv_getlength(bs); 2474 if (size < 0) { 2475 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2476 goto out; 2477 } 2478 2479 if (mode != NEW_IMAGE_MODE_EXISTING) { 2480 assert(format && drv); 2481 if (source) { 2482 bdrv_img_create(target, format, source->filename, 2483 source->drv->format_name, NULL, 2484 size, flags, &local_err, false); 2485 } else { 2486 bdrv_img_create(target, format, NULL, NULL, NULL, 2487 size, flags, &local_err, false); 2488 } 2489 } 2490 2491 if (local_err) { 2492 error_propagate(errp, local_err); 2493 goto out; 2494 } 2495 2496 target_bs = NULL; 2497 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2498 if (ret < 0) { 2499 error_propagate(errp, local_err); 2500 goto out; 2501 } 2502 2503 bdrv_set_aio_context(target_bs, aio_context); 2504 2505 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2506 block_job_cb, bs, &local_err); 2507 if (local_err != NULL) { 2508 bdrv_unref(target_bs); 2509 error_propagate(errp, local_err); 2510 goto out; 2511 } 2512 2513 out: 2514 aio_context_release(aio_context); 2515 } 2516 2517 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2518 { 2519 return bdrv_named_nodes_list(errp); 2520 } 2521 2522 void qmp_blockdev_backup(const char *device, const char *target, 2523 enum MirrorSyncMode sync, 2524 bool has_speed, int64_t speed, 2525 bool has_on_source_error, 2526 BlockdevOnError on_source_error, 2527 bool has_on_target_error, 2528 BlockdevOnError on_target_error, 2529 Error **errp) 2530 { 2531 BlockBackend *blk; 2532 BlockDriverState *bs; 2533 BlockDriverState *target_bs; 2534 Error *local_err = NULL; 2535 AioContext *aio_context; 2536 2537 if (!has_speed) { 2538 speed = 0; 2539 } 2540 if (!has_on_source_error) { 2541 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2542 } 2543 if (!has_on_target_error) { 2544 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2545 } 2546 2547 blk = blk_by_name(device); 2548 if (!blk) { 2549 error_setg(errp, "Device '%s' not found", device); 2550 return; 2551 } 2552 bs = blk_bs(blk); 2553 2554 aio_context = bdrv_get_aio_context(bs); 2555 aio_context_acquire(aio_context); 2556 2557 blk = blk_by_name(target); 2558 if (!blk) { 2559 error_setg(errp, "Device '%s' not found", target); 2560 goto out; 2561 } 2562 target_bs = blk_bs(blk); 2563 2564 bdrv_ref(target_bs); 2565 bdrv_set_aio_context(target_bs, aio_context); 2566 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2567 block_job_cb, bs, &local_err); 2568 if (local_err != NULL) { 2569 bdrv_unref(target_bs); 2570 error_propagate(errp, local_err); 2571 } 2572 out: 2573 aio_context_release(aio_context); 2574 } 2575 2576 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2577 2578 void qmp_drive_mirror(const char *device, const char *target, 2579 bool has_format, const char *format, 2580 bool has_node_name, const char *node_name, 2581 bool has_replaces, const char *replaces, 2582 enum MirrorSyncMode sync, 2583 bool has_mode, enum NewImageMode mode, 2584 bool has_speed, int64_t speed, 2585 bool has_granularity, uint32_t granularity, 2586 bool has_buf_size, int64_t buf_size, 2587 bool has_on_source_error, BlockdevOnError on_source_error, 2588 bool has_on_target_error, BlockdevOnError on_target_error, 2589 Error **errp) 2590 { 2591 BlockBackend *blk; 2592 BlockDriverState *bs; 2593 BlockDriverState *source, *target_bs; 2594 AioContext *aio_context; 2595 BlockDriver *drv = NULL; 2596 Error *local_err = NULL; 2597 QDict *options = NULL; 2598 int flags; 2599 int64_t size; 2600 int ret; 2601 2602 if (!has_speed) { 2603 speed = 0; 2604 } 2605 if (!has_on_source_error) { 2606 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2607 } 2608 if (!has_on_target_error) { 2609 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2610 } 2611 if (!has_mode) { 2612 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2613 } 2614 if (!has_granularity) { 2615 granularity = 0; 2616 } 2617 if (!has_buf_size) { 2618 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2619 } 2620 2621 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2622 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2623 "a value in range [512B, 64MB]"); 2624 return; 2625 } 2626 if (granularity & (granularity - 1)) { 2627 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2"); 2628 return; 2629 } 2630 2631 blk = blk_by_name(device); 2632 if (!blk) { 2633 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2634 return; 2635 } 2636 bs = blk_bs(blk); 2637 2638 aio_context = bdrv_get_aio_context(bs); 2639 aio_context_acquire(aio_context); 2640 2641 if (!bdrv_is_inserted(bs)) { 2642 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2643 goto out; 2644 } 2645 2646 if (!has_format) { 2647 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2648 } 2649 if (format) { 2650 drv = bdrv_find_format(format); 2651 if (!drv) { 2652 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2653 goto out; 2654 } 2655 } 2656 2657 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2658 goto out; 2659 } 2660 2661 flags = bs->open_flags | BDRV_O_RDWR; 2662 source = bs->backing_hd; 2663 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2664 sync = MIRROR_SYNC_MODE_FULL; 2665 } 2666 if (sync == MIRROR_SYNC_MODE_NONE) { 2667 source = bs; 2668 } 2669 2670 size = bdrv_getlength(bs); 2671 if (size < 0) { 2672 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2673 goto out; 2674 } 2675 2676 if (has_replaces) { 2677 BlockDriverState *to_replace_bs; 2678 AioContext *replace_aio_context; 2679 int64_t replace_size; 2680 2681 if (!has_node_name) { 2682 error_setg(errp, "a node-name must be provided when replacing a" 2683 " named node of the graph"); 2684 goto out; 2685 } 2686 2687 to_replace_bs = check_to_replace_node(replaces, &local_err); 2688 2689 if (!to_replace_bs) { 2690 error_propagate(errp, local_err); 2691 goto out; 2692 } 2693 2694 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2695 aio_context_acquire(replace_aio_context); 2696 replace_size = bdrv_getlength(to_replace_bs); 2697 aio_context_release(replace_aio_context); 2698 2699 if (size != replace_size) { 2700 error_setg(errp, "cannot replace image with a mirror image of " 2701 "different size"); 2702 goto out; 2703 } 2704 } 2705 2706 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2707 && mode != NEW_IMAGE_MODE_EXISTING) 2708 { 2709 /* create new image w/o backing file */ 2710 assert(format && drv); 2711 bdrv_img_create(target, format, 2712 NULL, NULL, NULL, size, flags, &local_err, false); 2713 } else { 2714 switch (mode) { 2715 case NEW_IMAGE_MODE_EXISTING: 2716 break; 2717 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2718 /* create new image with backing file */ 2719 bdrv_img_create(target, format, 2720 source->filename, 2721 source->drv->format_name, 2722 NULL, size, flags, &local_err, false); 2723 break; 2724 default: 2725 abort(); 2726 } 2727 } 2728 2729 if (local_err) { 2730 error_propagate(errp, local_err); 2731 goto out; 2732 } 2733 2734 if (has_node_name) { 2735 options = qdict_new(); 2736 qdict_put(options, "node-name", qstring_from_str(node_name)); 2737 } 2738 2739 /* Mirroring takes care of copy-on-write using the source's backing 2740 * file. 2741 */ 2742 target_bs = NULL; 2743 ret = bdrv_open(&target_bs, target, NULL, options, 2744 flags | BDRV_O_NO_BACKING, drv, &local_err); 2745 if (ret < 0) { 2746 error_propagate(errp, local_err); 2747 goto out; 2748 } 2749 2750 bdrv_set_aio_context(target_bs, aio_context); 2751 2752 /* pass the node name to replace to mirror start since it's loose coupling 2753 * and will allow to check whether the node still exist at mirror completion 2754 */ 2755 mirror_start(bs, target_bs, 2756 has_replaces ? replaces : NULL, 2757 speed, granularity, buf_size, sync, 2758 on_source_error, on_target_error, 2759 block_job_cb, bs, &local_err); 2760 if (local_err != NULL) { 2761 bdrv_unref(target_bs); 2762 error_propagate(errp, local_err); 2763 goto out; 2764 } 2765 2766 out: 2767 aio_context_release(aio_context); 2768 } 2769 2770 /* Get the block job for a given device name and acquire its AioContext */ 2771 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 2772 Error **errp) 2773 { 2774 BlockBackend *blk; 2775 BlockDriverState *bs; 2776 2777 blk = blk_by_name(device); 2778 if (!blk) { 2779 goto notfound; 2780 } 2781 bs = blk_bs(blk); 2782 2783 *aio_context = bdrv_get_aio_context(bs); 2784 aio_context_acquire(*aio_context); 2785 2786 if (!bs->job) { 2787 aio_context_release(*aio_context); 2788 goto notfound; 2789 } 2790 2791 return bs->job; 2792 2793 notfound: 2794 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 2795 "No active block job on device '%s'", device); 2796 *aio_context = NULL; 2797 return NULL; 2798 } 2799 2800 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2801 { 2802 AioContext *aio_context; 2803 BlockJob *job = find_block_job(device, &aio_context, errp); 2804 2805 if (!job) { 2806 return; 2807 } 2808 2809 block_job_set_speed(job, speed, errp); 2810 aio_context_release(aio_context); 2811 } 2812 2813 void qmp_block_job_cancel(const char *device, 2814 bool has_force, bool force, Error **errp) 2815 { 2816 AioContext *aio_context; 2817 BlockJob *job = find_block_job(device, &aio_context, errp); 2818 2819 if (!job) { 2820 return; 2821 } 2822 2823 if (!has_force) { 2824 force = false; 2825 } 2826 2827 if (job->user_paused && !force) { 2828 error_setg(errp, "The block job for device '%s' is currently paused", 2829 device); 2830 goto out; 2831 } 2832 2833 trace_qmp_block_job_cancel(job); 2834 block_job_cancel(job); 2835 out: 2836 aio_context_release(aio_context); 2837 } 2838 2839 void qmp_block_job_pause(const char *device, Error **errp) 2840 { 2841 AioContext *aio_context; 2842 BlockJob *job = find_block_job(device, &aio_context, errp); 2843 2844 if (!job || job->user_paused) { 2845 return; 2846 } 2847 2848 job->user_paused = true; 2849 trace_qmp_block_job_pause(job); 2850 block_job_pause(job); 2851 aio_context_release(aio_context); 2852 } 2853 2854 void qmp_block_job_resume(const char *device, Error **errp) 2855 { 2856 AioContext *aio_context; 2857 BlockJob *job = find_block_job(device, &aio_context, errp); 2858 2859 if (!job || !job->user_paused) { 2860 return; 2861 } 2862 2863 job->user_paused = false; 2864 trace_qmp_block_job_resume(job); 2865 block_job_resume(job); 2866 aio_context_release(aio_context); 2867 } 2868 2869 void qmp_block_job_complete(const char *device, Error **errp) 2870 { 2871 AioContext *aio_context; 2872 BlockJob *job = find_block_job(device, &aio_context, errp); 2873 2874 if (!job) { 2875 return; 2876 } 2877 2878 trace_qmp_block_job_complete(job); 2879 block_job_complete(job, errp); 2880 aio_context_release(aio_context); 2881 } 2882 2883 void qmp_change_backing_file(const char *device, 2884 const char *image_node_name, 2885 const char *backing_file, 2886 Error **errp) 2887 { 2888 BlockBackend *blk; 2889 BlockDriverState *bs = NULL; 2890 AioContext *aio_context; 2891 BlockDriverState *image_bs = NULL; 2892 Error *local_err = NULL; 2893 bool ro; 2894 int open_flags; 2895 int ret; 2896 2897 blk = blk_by_name(device); 2898 if (!blk) { 2899 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2900 return; 2901 } 2902 bs = blk_bs(blk); 2903 2904 aio_context = bdrv_get_aio_context(bs); 2905 aio_context_acquire(aio_context); 2906 2907 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2908 if (local_err) { 2909 error_propagate(errp, local_err); 2910 goto out; 2911 } 2912 2913 if (!image_bs) { 2914 error_setg(errp, "image file not found"); 2915 goto out; 2916 } 2917 2918 if (bdrv_find_base(image_bs) == image_bs) { 2919 error_setg(errp, "not allowing backing file change on an image " 2920 "without a backing file"); 2921 goto out; 2922 } 2923 2924 /* even though we are not necessarily operating on bs, we need it to 2925 * determine if block ops are currently prohibited on the chain */ 2926 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 2927 goto out; 2928 } 2929 2930 /* final sanity check */ 2931 if (!bdrv_chain_contains(bs, image_bs)) { 2932 error_setg(errp, "'%s' and image file are not in the same chain", 2933 device); 2934 goto out; 2935 } 2936 2937 /* if not r/w, reopen to make r/w */ 2938 open_flags = image_bs->open_flags; 2939 ro = bdrv_is_read_only(image_bs); 2940 2941 if (ro) { 2942 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 2943 if (local_err) { 2944 error_propagate(errp, local_err); 2945 goto out; 2946 } 2947 } 2948 2949 ret = bdrv_change_backing_file(image_bs, backing_file, 2950 image_bs->drv ? image_bs->drv->format_name : ""); 2951 2952 if (ret < 0) { 2953 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 2954 backing_file); 2955 /* don't exit here, so we can try to restore open flags if 2956 * appropriate */ 2957 } 2958 2959 if (ro) { 2960 bdrv_reopen(image_bs, open_flags, &local_err); 2961 if (local_err) { 2962 error_propagate(errp, local_err); /* will preserve prior errp */ 2963 } 2964 } 2965 2966 out: 2967 aio_context_release(aio_context); 2968 } 2969 2970 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2971 { 2972 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2973 BlockBackend *blk; 2974 QObject *obj; 2975 QDict *qdict; 2976 Error *local_err = NULL; 2977 2978 /* Require an ID in the top level */ 2979 if (!options->has_id) { 2980 error_setg(errp, "Block device needs an ID"); 2981 goto fail; 2982 } 2983 2984 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 2985 * cache.direct=false instead of silently switching to aio=threads, except 2986 * when called from drive_new(). 2987 * 2988 * For now, simply forbidding the combination for all drivers will do. */ 2989 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2990 bool direct = options->has_cache && 2991 options->cache->has_direct && 2992 options->cache->direct; 2993 if (!direct) { 2994 error_setg(errp, "aio=native requires cache.direct=true"); 2995 goto fail; 2996 } 2997 } 2998 2999 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 3000 &options, NULL, &local_err); 3001 if (local_err) { 3002 error_propagate(errp, local_err); 3003 goto fail; 3004 } 3005 3006 obj = qmp_output_get_qobject(ov); 3007 qdict = qobject_to_qdict(obj); 3008 3009 qdict_flatten(qdict); 3010 3011 blk = blockdev_init(NULL, qdict, &local_err); 3012 if (local_err) { 3013 error_propagate(errp, local_err); 3014 goto fail; 3015 } 3016 3017 if (bdrv_key_required(blk_bs(blk))) { 3018 blk_unref(blk); 3019 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 3020 goto fail; 3021 } 3022 3023 fail: 3024 qmp_output_visitor_cleanup(ov); 3025 } 3026 3027 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3028 { 3029 BlockJobInfoList *head = NULL, **p_next = &head; 3030 BlockDriverState *bs; 3031 3032 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 3033 AioContext *aio_context = bdrv_get_aio_context(bs); 3034 3035 aio_context_acquire(aio_context); 3036 3037 if (bs->job) { 3038 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 3039 elem->value = block_job_query(bs->job); 3040 *p_next = elem; 3041 p_next = &elem->next; 3042 } 3043 3044 aio_context_release(aio_context); 3045 } 3046 3047 return head; 3048 } 3049 3050 QemuOptsList qemu_common_drive_opts = { 3051 .name = "drive", 3052 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3053 .desc = { 3054 { 3055 .name = "snapshot", 3056 .type = QEMU_OPT_BOOL, 3057 .help = "enable/disable snapshot mode", 3058 },{ 3059 .name = "discard", 3060 .type = QEMU_OPT_STRING, 3061 .help = "discard operation (ignore/off, unmap/on)", 3062 },{ 3063 .name = "cache.writeback", 3064 .type = QEMU_OPT_BOOL, 3065 .help = "enables writeback mode for any caches", 3066 },{ 3067 .name = "cache.direct", 3068 .type = QEMU_OPT_BOOL, 3069 .help = "enables use of O_DIRECT (bypass the host page cache)", 3070 },{ 3071 .name = "cache.no-flush", 3072 .type = QEMU_OPT_BOOL, 3073 .help = "ignore any flush requests for the device", 3074 },{ 3075 .name = "aio", 3076 .type = QEMU_OPT_STRING, 3077 .help = "host AIO implementation (threads, native)", 3078 },{ 3079 .name = "format", 3080 .type = QEMU_OPT_STRING, 3081 .help = "disk format (raw, qcow2, ...)", 3082 },{ 3083 .name = "rerror", 3084 .type = QEMU_OPT_STRING, 3085 .help = "read error action", 3086 },{ 3087 .name = "werror", 3088 .type = QEMU_OPT_STRING, 3089 .help = "write error action", 3090 },{ 3091 .name = "read-only", 3092 .type = QEMU_OPT_BOOL, 3093 .help = "open drive file as read-only", 3094 },{ 3095 .name = "throttling.iops-total", 3096 .type = QEMU_OPT_NUMBER, 3097 .help = "limit total I/O operations per second", 3098 },{ 3099 .name = "throttling.iops-read", 3100 .type = QEMU_OPT_NUMBER, 3101 .help = "limit read operations per second", 3102 },{ 3103 .name = "throttling.iops-write", 3104 .type = QEMU_OPT_NUMBER, 3105 .help = "limit write operations per second", 3106 },{ 3107 .name = "throttling.bps-total", 3108 .type = QEMU_OPT_NUMBER, 3109 .help = "limit total bytes per second", 3110 },{ 3111 .name = "throttling.bps-read", 3112 .type = QEMU_OPT_NUMBER, 3113 .help = "limit read bytes per second", 3114 },{ 3115 .name = "throttling.bps-write", 3116 .type = QEMU_OPT_NUMBER, 3117 .help = "limit write bytes per second", 3118 },{ 3119 .name = "throttling.iops-total-max", 3120 .type = QEMU_OPT_NUMBER, 3121 .help = "I/O operations burst", 3122 },{ 3123 .name = "throttling.iops-read-max", 3124 .type = QEMU_OPT_NUMBER, 3125 .help = "I/O operations read burst", 3126 },{ 3127 .name = "throttling.iops-write-max", 3128 .type = QEMU_OPT_NUMBER, 3129 .help = "I/O operations write burst", 3130 },{ 3131 .name = "throttling.bps-total-max", 3132 .type = QEMU_OPT_NUMBER, 3133 .help = "total bytes burst", 3134 },{ 3135 .name = "throttling.bps-read-max", 3136 .type = QEMU_OPT_NUMBER, 3137 .help = "total bytes read burst", 3138 },{ 3139 .name = "throttling.bps-write-max", 3140 .type = QEMU_OPT_NUMBER, 3141 .help = "total bytes write burst", 3142 },{ 3143 .name = "throttling.iops-size", 3144 .type = QEMU_OPT_NUMBER, 3145 .help = "when limiting by iops max size of an I/O in bytes", 3146 },{ 3147 .name = "copy-on-read", 3148 .type = QEMU_OPT_BOOL, 3149 .help = "copy read data from backing file into image file", 3150 },{ 3151 .name = "detect-zeroes", 3152 .type = QEMU_OPT_STRING, 3153 .help = "try to optimize zero writes (off, on, unmap)", 3154 }, 3155 { /* end of list */ } 3156 }, 3157 }; 3158 3159 QemuOptsList qemu_drive_opts = { 3160 .name = "drive", 3161 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3162 .desc = { 3163 /* 3164 * no elements => accept any params 3165 * validation will happen later 3166 */ 3167 { /* end of list */ } 3168 }, 3169 }; 3170