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 "block/throttle-groups.h" 38 #include "monitor/monitor.h" 39 #include "qemu/option.h" 40 #include "qemu/config-file.h" 41 #include "qapi/qmp/types.h" 42 #include "qapi-visit.h" 43 #include "qapi/qmp-output-visitor.h" 44 #include "qapi/util.h" 45 #include "sysemu/sysemu.h" 46 #include "block/block_int.h" 47 #include "qmp-commands.h" 48 #include "trace.h" 49 #include "sysemu/arch_init.h" 50 51 static const char *const if_name[IF_COUNT] = { 52 [IF_NONE] = "none", 53 [IF_IDE] = "ide", 54 [IF_SCSI] = "scsi", 55 [IF_FLOPPY] = "floppy", 56 [IF_PFLASH] = "pflash", 57 [IF_MTD] = "mtd", 58 [IF_SD] = "sd", 59 [IF_VIRTIO] = "virtio", 60 [IF_XEN] = "xen", 61 }; 62 63 static int if_max_devs[IF_COUNT] = { 64 /* 65 * Do not change these numbers! They govern how drive option 66 * index maps to unit and bus. That mapping is ABI. 67 * 68 * All controllers used to imlement if=T drives need to support 69 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 70 * Otherwise, some index values map to "impossible" bus, unit 71 * values. 72 * 73 * For instance, if you change [IF_SCSI] to 255, -drive 74 * if=scsi,index=12 no longer means bus=1,unit=5, but 75 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 76 * the drive can't be set up. Regression. 77 */ 78 [IF_IDE] = 2, 79 [IF_SCSI] = 7, 80 }; 81 82 /** 83 * Boards may call this to offer board-by-board overrides 84 * of the default, global values. 85 */ 86 void override_max_devs(BlockInterfaceType type, int max_devs) 87 { 88 BlockBackend *blk; 89 DriveInfo *dinfo; 90 91 if (max_devs <= 0) { 92 return; 93 } 94 95 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 96 dinfo = blk_legacy_dinfo(blk); 97 if (dinfo->type == type) { 98 fprintf(stderr, "Cannot override units-per-bus property of" 99 " the %s interface, because a drive of that type has" 100 " already been added.\n", if_name[type]); 101 g_assert_not_reached(); 102 } 103 } 104 105 if_max_devs[type] = max_devs; 106 } 107 108 /* 109 * We automatically delete the drive when a device using it gets 110 * unplugged. Questionable feature, but we can't just drop it. 111 * Device models call blockdev_mark_auto_del() to schedule the 112 * automatic deletion, and generic qdev code calls blockdev_auto_del() 113 * when deletion is actually safe. 114 */ 115 void blockdev_mark_auto_del(BlockBackend *blk) 116 { 117 DriveInfo *dinfo = blk_legacy_dinfo(blk); 118 BlockDriverState *bs = blk_bs(blk); 119 AioContext *aio_context; 120 121 if (!dinfo) { 122 return; 123 } 124 125 aio_context = bdrv_get_aio_context(bs); 126 aio_context_acquire(aio_context); 127 128 if (bs->job) { 129 block_job_cancel(bs->job); 130 } 131 132 aio_context_release(aio_context); 133 134 dinfo->auto_del = 1; 135 } 136 137 void blockdev_auto_del(BlockBackend *blk) 138 { 139 DriveInfo *dinfo = blk_legacy_dinfo(blk); 140 141 if (dinfo && dinfo->auto_del) { 142 blk_unref(blk); 143 } 144 } 145 146 /** 147 * Returns the current mapping of how many units per bus 148 * a particular interface can support. 149 * 150 * A positive integer indicates n units per bus. 151 * 0 implies the mapping has not been established. 152 * -1 indicates an invalid BlockInterfaceType was given. 153 */ 154 int drive_get_max_devs(BlockInterfaceType type) 155 { 156 if (type >= IF_IDE && type < IF_COUNT) { 157 return if_max_devs[type]; 158 } 159 160 return -1; 161 } 162 163 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 164 { 165 int max_devs = if_max_devs[type]; 166 return max_devs ? index / max_devs : 0; 167 } 168 169 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 170 { 171 int max_devs = if_max_devs[type]; 172 return max_devs ? index % max_devs : index; 173 } 174 175 QemuOpts *drive_def(const char *optstr) 176 { 177 return qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false); 178 } 179 180 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 181 const char *optstr) 182 { 183 QemuOpts *opts; 184 185 opts = drive_def(optstr); 186 if (!opts) { 187 return NULL; 188 } 189 if (type != IF_DEFAULT) { 190 qemu_opt_set(opts, "if", if_name[type], &error_abort); 191 } 192 if (index >= 0) { 193 qemu_opt_set_number(opts, "index", index, &error_abort); 194 } 195 if (file) 196 qemu_opt_set(opts, "file", file, &error_abort); 197 return opts; 198 } 199 200 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 201 { 202 BlockBackend *blk; 203 DriveInfo *dinfo; 204 205 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 206 dinfo = blk_legacy_dinfo(blk); 207 if (dinfo && dinfo->type == type 208 && dinfo->bus == bus && dinfo->unit == unit) { 209 return dinfo; 210 } 211 } 212 213 return NULL; 214 } 215 216 bool drive_check_orphaned(void) 217 { 218 BlockBackend *blk; 219 DriveInfo *dinfo; 220 bool rs = false; 221 222 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 223 dinfo = blk_legacy_dinfo(blk); 224 /* If dinfo->bdrv->dev is NULL, it has no device attached. */ 225 /* Unless this is a default drive, this may be an oversight. */ 226 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 227 dinfo->type != IF_NONE) { 228 fprintf(stderr, "Warning: Orphaned drive without device: " 229 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n", 230 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type], 231 dinfo->bus, dinfo->unit); 232 rs = true; 233 } 234 } 235 236 return rs; 237 } 238 239 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 240 { 241 return drive_get(type, 242 drive_index_to_bus_id(type, index), 243 drive_index_to_unit_id(type, index)); 244 } 245 246 int drive_get_max_bus(BlockInterfaceType type) 247 { 248 int max_bus; 249 BlockBackend *blk; 250 DriveInfo *dinfo; 251 252 max_bus = -1; 253 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 254 dinfo = blk_legacy_dinfo(blk); 255 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 256 max_bus = dinfo->bus; 257 } 258 } 259 return max_bus; 260 } 261 262 /* Get a block device. This should only be used for single-drive devices 263 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 264 appropriate bus. */ 265 DriveInfo *drive_get_next(BlockInterfaceType type) 266 { 267 static int next_block_unit[IF_COUNT]; 268 269 return drive_get(type, 0, next_block_unit[type]++); 270 } 271 272 static void bdrv_format_print(void *opaque, const char *name) 273 { 274 error_printf(" %s", name); 275 } 276 277 typedef struct { 278 QEMUBH *bh; 279 BlockDriverState *bs; 280 } BDRVPutRefBH; 281 282 static void bdrv_put_ref_bh(void *opaque) 283 { 284 BDRVPutRefBH *s = opaque; 285 286 bdrv_unref(s->bs); 287 qemu_bh_delete(s->bh); 288 g_free(s); 289 } 290 291 /* 292 * Release a BDS reference in a BH 293 * 294 * It is not safe to use bdrv_unref() from a callback function when the callers 295 * still need the BlockDriverState. In such cases we schedule a BH to release 296 * the reference. 297 */ 298 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 299 { 300 BDRVPutRefBH *s; 301 302 s = g_new(BDRVPutRefBH, 1); 303 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 304 s->bs = bs; 305 qemu_bh_schedule(s->bh); 306 } 307 308 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 309 { 310 if (!strcmp(buf, "ignore")) { 311 return BLOCKDEV_ON_ERROR_IGNORE; 312 } else if (!is_read && !strcmp(buf, "enospc")) { 313 return BLOCKDEV_ON_ERROR_ENOSPC; 314 } else if (!strcmp(buf, "stop")) { 315 return BLOCKDEV_ON_ERROR_STOP; 316 } else if (!strcmp(buf, "report")) { 317 return BLOCKDEV_ON_ERROR_REPORT; 318 } else { 319 error_setg(errp, "'%s' invalid %s error action", 320 buf, is_read ? "read" : "write"); 321 return -1; 322 } 323 } 324 325 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 326 { 327 if (throttle_conflicting(cfg)) { 328 error_setg(errp, "bps/iops/max total values and read/write values" 329 " cannot be used at the same time"); 330 return false; 331 } 332 333 if (!throttle_is_valid(cfg)) { 334 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 335 return false; 336 } 337 338 return true; 339 } 340 341 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 342 343 /* Takes the ownership of bs_opts */ 344 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 345 Error **errp) 346 { 347 const char *buf; 348 int ro = 0; 349 int bdrv_flags = 0; 350 int on_read_error, on_write_error; 351 BlockBackend *blk; 352 BlockDriverState *bs; 353 ThrottleConfig cfg; 354 int snapshot = 0; 355 bool copy_on_read; 356 Error *error = NULL; 357 QemuOpts *opts; 358 const char *id; 359 bool has_driver_specific_opts; 360 BlockdevDetectZeroesOptions detect_zeroes; 361 const char *throttling_group; 362 363 /* Check common options by copying from bs_opts to opts, all other options 364 * stay in bs_opts for processing by bdrv_open(). */ 365 id = qdict_get_try_str(bs_opts, "id"); 366 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 367 if (error) { 368 error_propagate(errp, error); 369 goto err_no_opts; 370 } 371 372 qemu_opts_absorb_qdict(opts, bs_opts, &error); 373 if (error) { 374 error_propagate(errp, error); 375 goto early_err; 376 } 377 378 if (id) { 379 qdict_del(bs_opts, "id"); 380 } 381 382 has_driver_specific_opts = !!qdict_size(bs_opts); 383 384 /* extract parameters */ 385 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 386 ro = qemu_opt_get_bool(opts, "read-only", 0); 387 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 388 389 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 390 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 391 error_setg(errp, "invalid discard option"); 392 goto early_err; 393 } 394 } 395 396 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) { 397 bdrv_flags |= BDRV_O_CACHE_WB; 398 } 399 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) { 400 bdrv_flags |= BDRV_O_NOCACHE; 401 } 402 if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { 403 bdrv_flags |= BDRV_O_NO_FLUSH; 404 } 405 406 #ifdef CONFIG_LINUX_AIO 407 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 408 if (!strcmp(buf, "native")) { 409 bdrv_flags |= BDRV_O_NATIVE_AIO; 410 } else if (!strcmp(buf, "threads")) { 411 /* this is the default */ 412 } else { 413 error_setg(errp, "invalid aio option"); 414 goto early_err; 415 } 416 } 417 #endif 418 419 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 420 if (is_help_option(buf)) { 421 error_printf("Supported formats:"); 422 bdrv_iterate_format(bdrv_format_print, NULL); 423 error_printf("\n"); 424 goto early_err; 425 } 426 427 if (qdict_haskey(bs_opts, "driver")) { 428 error_setg(errp, "Cannot specify both 'driver' and 'format'"); 429 goto early_err; 430 } 431 qdict_put(bs_opts, "driver", qstring_from_str(buf)); 432 } 433 434 /* disk I/O throttling */ 435 memset(&cfg, 0, sizeof(cfg)); 436 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 437 qemu_opt_get_number(opts, "throttling.bps-total", 0); 438 cfg.buckets[THROTTLE_BPS_READ].avg = 439 qemu_opt_get_number(opts, "throttling.bps-read", 0); 440 cfg.buckets[THROTTLE_BPS_WRITE].avg = 441 qemu_opt_get_number(opts, "throttling.bps-write", 0); 442 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 443 qemu_opt_get_number(opts, "throttling.iops-total", 0); 444 cfg.buckets[THROTTLE_OPS_READ].avg = 445 qemu_opt_get_number(opts, "throttling.iops-read", 0); 446 cfg.buckets[THROTTLE_OPS_WRITE].avg = 447 qemu_opt_get_number(opts, "throttling.iops-write", 0); 448 449 cfg.buckets[THROTTLE_BPS_TOTAL].max = 450 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 451 cfg.buckets[THROTTLE_BPS_READ].max = 452 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 453 cfg.buckets[THROTTLE_BPS_WRITE].max = 454 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 455 cfg.buckets[THROTTLE_OPS_TOTAL].max = 456 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 457 cfg.buckets[THROTTLE_OPS_READ].max = 458 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 459 cfg.buckets[THROTTLE_OPS_WRITE].max = 460 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 461 462 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 463 464 throttling_group = qemu_opt_get(opts, "throttling.group"); 465 466 if (!check_throttle_config(&cfg, &error)) { 467 error_propagate(errp, error); 468 goto early_err; 469 } 470 471 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 472 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 473 on_write_error = parse_block_error_action(buf, 0, &error); 474 if (error) { 475 error_propagate(errp, error); 476 goto early_err; 477 } 478 } 479 480 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 481 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 482 on_read_error = parse_block_error_action(buf, 1, &error); 483 if (error) { 484 error_propagate(errp, error); 485 goto early_err; 486 } 487 } 488 489 detect_zeroes = 490 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 491 qemu_opt_get(opts, "detect-zeroes"), 492 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 493 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 494 &error); 495 if (error) { 496 error_propagate(errp, error); 497 goto early_err; 498 } 499 500 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 501 !(bdrv_flags & BDRV_O_UNMAP)) { 502 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 503 "without setting discard operation to unmap"); 504 goto early_err; 505 } 506 507 /* init */ 508 if ((!file || !*file) && !has_driver_specific_opts) { 509 blk = blk_new_with_bs(qemu_opts_id(opts), errp); 510 if (!blk) { 511 goto early_err; 512 } 513 514 bs = blk_bs(blk); 515 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 516 bs->read_only = ro; 517 518 QDECREF(bs_opts); 519 } else { 520 if (file && !*file) { 521 file = NULL; 522 } 523 524 if (snapshot) { 525 /* always use cache=unsafe with snapshot */ 526 bdrv_flags &= ~BDRV_O_CACHE_MASK; 527 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 528 } 529 530 if (copy_on_read) { 531 bdrv_flags |= BDRV_O_COPY_ON_READ; 532 } 533 534 if (runstate_check(RUN_STATE_INMIGRATE)) { 535 bdrv_flags |= BDRV_O_INCOMING; 536 } 537 538 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 539 540 blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags, 541 errp); 542 if (!blk) { 543 goto err_no_bs_opts; 544 } 545 bs = blk_bs(blk); 546 } 547 548 bs->detect_zeroes = detect_zeroes; 549 550 bdrv_set_on_error(bs, on_read_error, on_write_error); 551 552 /* disk I/O throttling */ 553 if (throttle_enabled(&cfg)) { 554 if (!throttling_group) { 555 throttling_group = blk_name(blk); 556 } 557 bdrv_io_limits_enable(bs, throttling_group); 558 bdrv_set_io_limits(bs, &cfg); 559 } 560 561 if (bdrv_key_required(bs)) { 562 autostart = 0; 563 } 564 565 err_no_bs_opts: 566 qemu_opts_del(opts); 567 return blk; 568 569 early_err: 570 qemu_opts_del(opts); 571 err_no_opts: 572 QDECREF(bs_opts); 573 return NULL; 574 } 575 576 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 577 Error **errp) 578 { 579 const char *value; 580 581 value = qemu_opt_get(opts, from); 582 if (value) { 583 if (qemu_opt_find(opts, to)) { 584 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 585 "same time", to, from); 586 return; 587 } 588 } 589 590 /* rename all items in opts */ 591 while ((value = qemu_opt_get(opts, from))) { 592 qemu_opt_set(opts, to, value, &error_abort); 593 qemu_opt_unset(opts, from); 594 } 595 } 596 597 QemuOptsList qemu_legacy_drive_opts = { 598 .name = "drive", 599 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 600 .desc = { 601 { 602 .name = "bus", 603 .type = QEMU_OPT_NUMBER, 604 .help = "bus number", 605 },{ 606 .name = "unit", 607 .type = QEMU_OPT_NUMBER, 608 .help = "unit number (i.e. lun for scsi)", 609 },{ 610 .name = "index", 611 .type = QEMU_OPT_NUMBER, 612 .help = "index number", 613 },{ 614 .name = "media", 615 .type = QEMU_OPT_STRING, 616 .help = "media type (disk, cdrom)", 617 },{ 618 .name = "if", 619 .type = QEMU_OPT_STRING, 620 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 621 },{ 622 .name = "cyls", 623 .type = QEMU_OPT_NUMBER, 624 .help = "number of cylinders (ide disk geometry)", 625 },{ 626 .name = "heads", 627 .type = QEMU_OPT_NUMBER, 628 .help = "number of heads (ide disk geometry)", 629 },{ 630 .name = "secs", 631 .type = QEMU_OPT_NUMBER, 632 .help = "number of sectors (ide disk geometry)", 633 },{ 634 .name = "trans", 635 .type = QEMU_OPT_STRING, 636 .help = "chs translation (auto, lba, none)", 637 },{ 638 .name = "boot", 639 .type = QEMU_OPT_BOOL, 640 .help = "(deprecated, ignored)", 641 },{ 642 .name = "addr", 643 .type = QEMU_OPT_STRING, 644 .help = "pci address (virtio only)", 645 },{ 646 .name = "serial", 647 .type = QEMU_OPT_STRING, 648 .help = "disk serial number", 649 },{ 650 .name = "file", 651 .type = QEMU_OPT_STRING, 652 .help = "file name", 653 }, 654 655 /* Options that are passed on, but have special semantics with -drive */ 656 { 657 .name = "read-only", 658 .type = QEMU_OPT_BOOL, 659 .help = "open drive file as read-only", 660 },{ 661 .name = "rerror", 662 .type = QEMU_OPT_STRING, 663 .help = "read error action", 664 },{ 665 .name = "werror", 666 .type = QEMU_OPT_STRING, 667 .help = "write error action", 668 },{ 669 .name = "copy-on-read", 670 .type = QEMU_OPT_BOOL, 671 .help = "copy read data from backing file into image file", 672 }, 673 674 { /* end of list */ } 675 }, 676 }; 677 678 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 679 { 680 const char *value; 681 BlockBackend *blk; 682 DriveInfo *dinfo = NULL; 683 QDict *bs_opts; 684 QemuOpts *legacy_opts; 685 DriveMediaType media = MEDIA_DISK; 686 BlockInterfaceType type; 687 int cyls, heads, secs, translation; 688 int max_devs, bus_id, unit_id, index; 689 const char *devaddr; 690 const char *werror, *rerror; 691 bool read_only = false; 692 bool copy_on_read; 693 const char *serial; 694 const char *filename; 695 Error *local_err = NULL; 696 int i; 697 698 /* Change legacy command line options into QMP ones */ 699 static const struct { 700 const char *from; 701 const char *to; 702 } opt_renames[] = { 703 { "iops", "throttling.iops-total" }, 704 { "iops_rd", "throttling.iops-read" }, 705 { "iops_wr", "throttling.iops-write" }, 706 707 { "bps", "throttling.bps-total" }, 708 { "bps_rd", "throttling.bps-read" }, 709 { "bps_wr", "throttling.bps-write" }, 710 711 { "iops_max", "throttling.iops-total-max" }, 712 { "iops_rd_max", "throttling.iops-read-max" }, 713 { "iops_wr_max", "throttling.iops-write-max" }, 714 715 { "bps_max", "throttling.bps-total-max" }, 716 { "bps_rd_max", "throttling.bps-read-max" }, 717 { "bps_wr_max", "throttling.bps-write-max" }, 718 719 { "iops_size", "throttling.iops-size" }, 720 721 { "group", "throttling.group" }, 722 723 { "readonly", "read-only" }, 724 }; 725 726 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 727 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 728 &local_err); 729 if (local_err) { 730 error_report_err(local_err); 731 return NULL; 732 } 733 } 734 735 value = qemu_opt_get(all_opts, "cache"); 736 if (value) { 737 int flags = 0; 738 739 if (bdrv_parse_cache_flags(value, &flags) != 0) { 740 error_report("invalid cache option"); 741 return NULL; 742 } 743 744 /* Specific options take precedence */ 745 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) { 746 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB, 747 !!(flags & BDRV_O_CACHE_WB), &error_abort); 748 } 749 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) { 750 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT, 751 !!(flags & BDRV_O_NOCACHE), &error_abort); 752 } 753 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) { 754 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH, 755 !!(flags & BDRV_O_NO_FLUSH), &error_abort); 756 } 757 qemu_opt_unset(all_opts, "cache"); 758 } 759 760 /* Get a QDict for processing the options */ 761 bs_opts = qdict_new(); 762 qemu_opts_to_qdict(all_opts, bs_opts); 763 764 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 765 &error_abort); 766 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 767 if (local_err) { 768 error_report_err(local_err); 769 goto fail; 770 } 771 772 /* Deprecated option boot=[on|off] */ 773 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 774 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 775 "ignored. Future versions will reject this parameter. Please " 776 "update your scripts.\n"); 777 } 778 779 /* Media type */ 780 value = qemu_opt_get(legacy_opts, "media"); 781 if (value) { 782 if (!strcmp(value, "disk")) { 783 media = MEDIA_DISK; 784 } else if (!strcmp(value, "cdrom")) { 785 media = MEDIA_CDROM; 786 read_only = true; 787 } else { 788 error_report("'%s' invalid media", value); 789 goto fail; 790 } 791 } 792 793 /* copy-on-read is disabled with a warning for read-only devices */ 794 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 795 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 796 797 if (read_only && copy_on_read) { 798 error_report("warning: disabling copy-on-read on read-only drive"); 799 copy_on_read = false; 800 } 801 802 qdict_put(bs_opts, "read-only", 803 qstring_from_str(read_only ? "on" : "off")); 804 qdict_put(bs_opts, "copy-on-read", 805 qstring_from_str(copy_on_read ? "on" :"off")); 806 807 /* Controller type */ 808 value = qemu_opt_get(legacy_opts, "if"); 809 if (value) { 810 for (type = 0; 811 type < IF_COUNT && strcmp(value, if_name[type]); 812 type++) { 813 } 814 if (type == IF_COUNT) { 815 error_report("unsupported bus type '%s'", value); 816 goto fail; 817 } 818 } else { 819 type = block_default_type; 820 } 821 822 /* Geometry */ 823 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 824 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 825 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 826 827 if (cyls || heads || secs) { 828 if (cyls < 1) { 829 error_report("invalid physical cyls number"); 830 goto fail; 831 } 832 if (heads < 1) { 833 error_report("invalid physical heads number"); 834 goto fail; 835 } 836 if (secs < 1) { 837 error_report("invalid physical secs number"); 838 goto fail; 839 } 840 } 841 842 translation = BIOS_ATA_TRANSLATION_AUTO; 843 value = qemu_opt_get(legacy_opts, "trans"); 844 if (value != NULL) { 845 if (!cyls) { 846 error_report("'%s' trans must be used with cyls, heads and secs", 847 value); 848 goto fail; 849 } 850 if (!strcmp(value, "none")) { 851 translation = BIOS_ATA_TRANSLATION_NONE; 852 } else if (!strcmp(value, "lba")) { 853 translation = BIOS_ATA_TRANSLATION_LBA; 854 } else if (!strcmp(value, "large")) { 855 translation = BIOS_ATA_TRANSLATION_LARGE; 856 } else if (!strcmp(value, "rechs")) { 857 translation = BIOS_ATA_TRANSLATION_RECHS; 858 } else if (!strcmp(value, "auto")) { 859 translation = BIOS_ATA_TRANSLATION_AUTO; 860 } else { 861 error_report("'%s' invalid translation type", value); 862 goto fail; 863 } 864 } 865 866 if (media == MEDIA_CDROM) { 867 if (cyls || secs || heads) { 868 error_report("CHS can't be set with media=cdrom"); 869 goto fail; 870 } 871 } 872 873 /* Device address specified by bus/unit or index. 874 * If none was specified, try to find the first free one. */ 875 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 876 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 877 index = qemu_opt_get_number(legacy_opts, "index", -1); 878 879 max_devs = if_max_devs[type]; 880 881 if (index != -1) { 882 if (bus_id != 0 || unit_id != -1) { 883 error_report("index cannot be used with bus and unit"); 884 goto fail; 885 } 886 bus_id = drive_index_to_bus_id(type, index); 887 unit_id = drive_index_to_unit_id(type, index); 888 } 889 890 if (unit_id == -1) { 891 unit_id = 0; 892 while (drive_get(type, bus_id, unit_id) != NULL) { 893 unit_id++; 894 if (max_devs && unit_id >= max_devs) { 895 unit_id -= max_devs; 896 bus_id++; 897 } 898 } 899 } 900 901 if (max_devs && unit_id >= max_devs) { 902 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 903 goto fail; 904 } 905 906 if (drive_get(type, bus_id, unit_id) != NULL) { 907 error_report("drive with bus=%d, unit=%d (index=%d) exists", 908 bus_id, unit_id, index); 909 goto fail; 910 } 911 912 /* Serial number */ 913 serial = qemu_opt_get(legacy_opts, "serial"); 914 915 /* no id supplied -> create one */ 916 if (qemu_opts_id(all_opts) == NULL) { 917 char *new_id; 918 const char *mediastr = ""; 919 if (type == IF_IDE || type == IF_SCSI) { 920 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 921 } 922 if (max_devs) { 923 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 924 mediastr, unit_id); 925 } else { 926 new_id = g_strdup_printf("%s%s%i", if_name[type], 927 mediastr, unit_id); 928 } 929 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 930 g_free(new_id); 931 } 932 933 /* Add virtio block device */ 934 devaddr = qemu_opt_get(legacy_opts, "addr"); 935 if (devaddr && type != IF_VIRTIO) { 936 error_report("addr is not supported by this bus type"); 937 goto fail; 938 } 939 940 if (type == IF_VIRTIO) { 941 QemuOpts *devopts; 942 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 943 &error_abort); 944 if (arch_type == QEMU_ARCH_S390X) { 945 qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort); 946 } else { 947 qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort); 948 } 949 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"), 950 &error_abort); 951 if (devaddr) { 952 qemu_opt_set(devopts, "addr", devaddr, &error_abort); 953 } 954 } 955 956 filename = qemu_opt_get(legacy_opts, "file"); 957 958 /* Check werror/rerror compatibility with if=... */ 959 werror = qemu_opt_get(legacy_opts, "werror"); 960 if (werror != NULL) { 961 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 962 type != IF_NONE) { 963 error_report("werror is not supported by this bus type"); 964 goto fail; 965 } 966 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 967 } 968 969 rerror = qemu_opt_get(legacy_opts, "rerror"); 970 if (rerror != NULL) { 971 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 972 type != IF_NONE) { 973 error_report("rerror is not supported by this bus type"); 974 goto fail; 975 } 976 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 977 } 978 979 /* Actual block device init: Functionality shared with blockdev-add */ 980 blk = blockdev_init(filename, bs_opts, &local_err); 981 bs_opts = NULL; 982 if (!blk) { 983 if (local_err) { 984 error_report_err(local_err); 985 } 986 goto fail; 987 } else { 988 assert(!local_err); 989 } 990 991 /* Create legacy DriveInfo */ 992 dinfo = g_malloc0(sizeof(*dinfo)); 993 dinfo->opts = all_opts; 994 995 dinfo->cyls = cyls; 996 dinfo->heads = heads; 997 dinfo->secs = secs; 998 dinfo->trans = translation; 999 1000 dinfo->type = type; 1001 dinfo->bus = bus_id; 1002 dinfo->unit = unit_id; 1003 dinfo->devaddr = devaddr; 1004 dinfo->serial = g_strdup(serial); 1005 1006 blk_set_legacy_dinfo(blk, dinfo); 1007 1008 switch(type) { 1009 case IF_IDE: 1010 case IF_SCSI: 1011 case IF_XEN: 1012 case IF_NONE: 1013 dinfo->media_cd = media == MEDIA_CDROM; 1014 break; 1015 default: 1016 break; 1017 } 1018 1019 fail: 1020 qemu_opts_del(legacy_opts); 1021 QDECREF(bs_opts); 1022 return dinfo; 1023 } 1024 1025 void hmp_commit(Monitor *mon, const QDict *qdict) 1026 { 1027 const char *device = qdict_get_str(qdict, "device"); 1028 BlockBackend *blk; 1029 int ret; 1030 1031 if (!strcmp(device, "all")) { 1032 ret = bdrv_commit_all(); 1033 } else { 1034 blk = blk_by_name(device); 1035 if (!blk) { 1036 monitor_printf(mon, "Device '%s' not found\n", device); 1037 return; 1038 } 1039 ret = bdrv_commit(blk_bs(blk)); 1040 } 1041 if (ret < 0) { 1042 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1043 strerror(-ret)); 1044 } 1045 } 1046 1047 static void blockdev_do_action(int kind, void *data, Error **errp) 1048 { 1049 TransactionAction action; 1050 TransactionActionList list; 1051 1052 action.kind = kind; 1053 action.data = data; 1054 list.value = &action; 1055 list.next = NULL; 1056 qmp_transaction(&list, errp); 1057 } 1058 1059 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1060 bool has_node_name, const char *node_name, 1061 const char *snapshot_file, 1062 bool has_snapshot_node_name, 1063 const char *snapshot_node_name, 1064 bool has_format, const char *format, 1065 bool has_mode, NewImageMode mode, Error **errp) 1066 { 1067 BlockdevSnapshot snapshot = { 1068 .has_device = has_device, 1069 .device = (char *) device, 1070 .has_node_name = has_node_name, 1071 .node_name = (char *) node_name, 1072 .snapshot_file = (char *) snapshot_file, 1073 .has_snapshot_node_name = has_snapshot_node_name, 1074 .snapshot_node_name = (char *) snapshot_node_name, 1075 .has_format = has_format, 1076 .format = (char *) format, 1077 .has_mode = has_mode, 1078 .mode = mode, 1079 }; 1080 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1081 &snapshot, errp); 1082 } 1083 1084 void qmp_blockdev_snapshot_internal_sync(const char *device, 1085 const char *name, 1086 Error **errp) 1087 { 1088 BlockdevSnapshotInternal snapshot = { 1089 .device = (char *) device, 1090 .name = (char *) name 1091 }; 1092 1093 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1094 &snapshot, errp); 1095 } 1096 1097 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1098 bool has_id, 1099 const char *id, 1100 bool has_name, 1101 const char *name, 1102 Error **errp) 1103 { 1104 BlockDriverState *bs; 1105 BlockBackend *blk; 1106 AioContext *aio_context; 1107 QEMUSnapshotInfo sn; 1108 Error *local_err = NULL; 1109 SnapshotInfo *info = NULL; 1110 int ret; 1111 1112 blk = blk_by_name(device); 1113 if (!blk) { 1114 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1115 "Device '%s' not found", device); 1116 return NULL; 1117 } 1118 bs = blk_bs(blk); 1119 1120 if (!has_id) { 1121 id = NULL; 1122 } 1123 1124 if (!has_name) { 1125 name = NULL; 1126 } 1127 1128 if (!id && !name) { 1129 error_setg(errp, "Name or id must be provided"); 1130 return NULL; 1131 } 1132 1133 aio_context = bdrv_get_aio_context(bs); 1134 aio_context_acquire(aio_context); 1135 1136 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1137 goto out_aio_context; 1138 } 1139 1140 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1141 if (local_err) { 1142 error_propagate(errp, local_err); 1143 goto out_aio_context; 1144 } 1145 if (!ret) { 1146 error_setg(errp, 1147 "Snapshot with id '%s' and name '%s' does not exist on " 1148 "device '%s'", 1149 STR_OR_NULL(id), STR_OR_NULL(name), device); 1150 goto out_aio_context; 1151 } 1152 1153 bdrv_snapshot_delete(bs, id, name, &local_err); 1154 if (local_err) { 1155 error_propagate(errp, local_err); 1156 goto out_aio_context; 1157 } 1158 1159 aio_context_release(aio_context); 1160 1161 info = g_new0(SnapshotInfo, 1); 1162 info->id = g_strdup(sn.id_str); 1163 info->name = g_strdup(sn.name); 1164 info->date_nsec = sn.date_nsec; 1165 info->date_sec = sn.date_sec; 1166 info->vm_state_size = sn.vm_state_size; 1167 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1168 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1169 1170 return info; 1171 1172 out_aio_context: 1173 aio_context_release(aio_context); 1174 return NULL; 1175 } 1176 1177 /** 1178 * block_dirty_bitmap_lookup: 1179 * Return a dirty bitmap (if present), after validating 1180 * the node reference and bitmap names. 1181 * 1182 * @node: The name of the BDS node to search for bitmaps 1183 * @name: The name of the bitmap to search for 1184 * @pbs: Output pointer for BDS lookup, if desired. Can be NULL. 1185 * @paio: Output pointer for aio_context acquisition, if desired. Can be NULL. 1186 * @errp: Output pointer for error information. Can be NULL. 1187 * 1188 * @return: A bitmap object on success, or NULL on failure. 1189 */ 1190 static BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node, 1191 const char *name, 1192 BlockDriverState **pbs, 1193 AioContext **paio, 1194 Error **errp) 1195 { 1196 BlockDriverState *bs; 1197 BdrvDirtyBitmap *bitmap; 1198 AioContext *aio_context; 1199 1200 if (!node) { 1201 error_setg(errp, "Node cannot be NULL"); 1202 return NULL; 1203 } 1204 if (!name) { 1205 error_setg(errp, "Bitmap name cannot be NULL"); 1206 return NULL; 1207 } 1208 bs = bdrv_lookup_bs(node, node, NULL); 1209 if (!bs) { 1210 error_setg(errp, "Node '%s' not found", node); 1211 return NULL; 1212 } 1213 1214 aio_context = bdrv_get_aio_context(bs); 1215 aio_context_acquire(aio_context); 1216 1217 bitmap = bdrv_find_dirty_bitmap(bs, name); 1218 if (!bitmap) { 1219 error_setg(errp, "Dirty bitmap '%s' not found", name); 1220 goto fail; 1221 } 1222 1223 if (pbs) { 1224 *pbs = bs; 1225 } 1226 if (paio) { 1227 *paio = aio_context; 1228 } else { 1229 aio_context_release(aio_context); 1230 } 1231 1232 return bitmap; 1233 1234 fail: 1235 aio_context_release(aio_context); 1236 return NULL; 1237 } 1238 1239 /* New and old BlockDriverState structs for atomic group operations */ 1240 1241 typedef struct BlkTransactionState BlkTransactionState; 1242 1243 /* Only prepare() may fail. In a single transaction, only one of commit() or 1244 abort() will be called, clean() will always be called if it present. */ 1245 typedef struct BdrvActionOps { 1246 /* Size of state struct, in bytes. */ 1247 size_t instance_size; 1248 /* Prepare the work, must NOT be NULL. */ 1249 void (*prepare)(BlkTransactionState *common, Error **errp); 1250 /* Commit the changes, can be NULL. */ 1251 void (*commit)(BlkTransactionState *common); 1252 /* Abort the changes on fail, can be NULL. */ 1253 void (*abort)(BlkTransactionState *common); 1254 /* Clean up resource in the end, can be NULL. */ 1255 void (*clean)(BlkTransactionState *common); 1256 } BdrvActionOps; 1257 1258 /* 1259 * This structure must be arranged as first member in child type, assuming 1260 * that compiler will also arrange it to the same address with parent instance. 1261 * Later it will be used in free(). 1262 */ 1263 struct BlkTransactionState { 1264 TransactionAction *action; 1265 const BdrvActionOps *ops; 1266 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1267 }; 1268 1269 /* internal snapshot private data */ 1270 typedef struct InternalSnapshotState { 1271 BlkTransactionState common; 1272 BlockDriverState *bs; 1273 AioContext *aio_context; 1274 QEMUSnapshotInfo sn; 1275 } InternalSnapshotState; 1276 1277 static void internal_snapshot_prepare(BlkTransactionState *common, 1278 Error **errp) 1279 { 1280 Error *local_err = NULL; 1281 const char *device; 1282 const char *name; 1283 BlockBackend *blk; 1284 BlockDriverState *bs; 1285 QEMUSnapshotInfo old_sn, *sn; 1286 bool ret; 1287 qemu_timeval tv; 1288 BlockdevSnapshotInternal *internal; 1289 InternalSnapshotState *state; 1290 int ret1; 1291 1292 g_assert(common->action->kind == 1293 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1294 internal = common->action->blockdev_snapshot_internal_sync; 1295 state = DO_UPCAST(InternalSnapshotState, common, common); 1296 1297 /* 1. parse input */ 1298 device = internal->device; 1299 name = internal->name; 1300 1301 /* 2. check for validation */ 1302 blk = blk_by_name(device); 1303 if (!blk) { 1304 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1305 "Device '%s' not found", device); 1306 return; 1307 } 1308 bs = blk_bs(blk); 1309 1310 /* AioContext is released in .clean() */ 1311 state->aio_context = bdrv_get_aio_context(bs); 1312 aio_context_acquire(state->aio_context); 1313 1314 if (!bdrv_is_inserted(bs)) { 1315 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1316 return; 1317 } 1318 1319 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1320 return; 1321 } 1322 1323 if (bdrv_is_read_only(bs)) { 1324 error_setg(errp, "Device '%s' is read only", device); 1325 return; 1326 } 1327 1328 if (!bdrv_can_snapshot(bs)) { 1329 error_setg(errp, "Block format '%s' used by device '%s' " 1330 "does not support internal snapshots", 1331 bs->drv->format_name, device); 1332 return; 1333 } 1334 1335 if (!strlen(name)) { 1336 error_setg(errp, "Name is empty"); 1337 return; 1338 } 1339 1340 /* check whether a snapshot with name exist */ 1341 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1342 &local_err); 1343 if (local_err) { 1344 error_propagate(errp, local_err); 1345 return; 1346 } else if (ret) { 1347 error_setg(errp, 1348 "Snapshot with name '%s' already exists on device '%s'", 1349 name, device); 1350 return; 1351 } 1352 1353 /* 3. take the snapshot */ 1354 sn = &state->sn; 1355 pstrcpy(sn->name, sizeof(sn->name), name); 1356 qemu_gettimeofday(&tv); 1357 sn->date_sec = tv.tv_sec; 1358 sn->date_nsec = tv.tv_usec * 1000; 1359 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1360 1361 ret1 = bdrv_snapshot_create(bs, sn); 1362 if (ret1 < 0) { 1363 error_setg_errno(errp, -ret1, 1364 "Failed to create snapshot '%s' on device '%s'", 1365 name, device); 1366 return; 1367 } 1368 1369 /* 4. succeed, mark a snapshot is created */ 1370 state->bs = bs; 1371 } 1372 1373 static void internal_snapshot_abort(BlkTransactionState *common) 1374 { 1375 InternalSnapshotState *state = 1376 DO_UPCAST(InternalSnapshotState, common, common); 1377 BlockDriverState *bs = state->bs; 1378 QEMUSnapshotInfo *sn = &state->sn; 1379 Error *local_error = NULL; 1380 1381 if (!bs) { 1382 return; 1383 } 1384 1385 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1386 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1387 "device '%s' in abort: %s", 1388 sn->id_str, 1389 sn->name, 1390 bdrv_get_device_name(bs), 1391 error_get_pretty(local_error)); 1392 error_free(local_error); 1393 } 1394 } 1395 1396 static void internal_snapshot_clean(BlkTransactionState *common) 1397 { 1398 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1399 common, common); 1400 1401 if (state->aio_context) { 1402 aio_context_release(state->aio_context); 1403 } 1404 } 1405 1406 /* external snapshot private data */ 1407 typedef struct ExternalSnapshotState { 1408 BlkTransactionState common; 1409 BlockDriverState *old_bs; 1410 BlockDriverState *new_bs; 1411 AioContext *aio_context; 1412 } ExternalSnapshotState; 1413 1414 static void external_snapshot_prepare(BlkTransactionState *common, 1415 Error **errp) 1416 { 1417 BlockDriver *drv; 1418 int flags, ret; 1419 QDict *options = NULL; 1420 Error *local_err = NULL; 1421 bool has_device = false; 1422 const char *device; 1423 bool has_node_name = false; 1424 const char *node_name; 1425 bool has_snapshot_node_name = false; 1426 const char *snapshot_node_name; 1427 const char *new_image_file; 1428 const char *format = "qcow2"; 1429 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1430 ExternalSnapshotState *state = 1431 DO_UPCAST(ExternalSnapshotState, common, common); 1432 TransactionAction *action = common->action; 1433 1434 /* get parameters */ 1435 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1436 1437 has_device = action->blockdev_snapshot_sync->has_device; 1438 device = action->blockdev_snapshot_sync->device; 1439 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1440 node_name = action->blockdev_snapshot_sync->node_name; 1441 has_snapshot_node_name = 1442 action->blockdev_snapshot_sync->has_snapshot_node_name; 1443 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1444 1445 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1446 if (action->blockdev_snapshot_sync->has_format) { 1447 format = action->blockdev_snapshot_sync->format; 1448 } 1449 if (action->blockdev_snapshot_sync->has_mode) { 1450 mode = action->blockdev_snapshot_sync->mode; 1451 } 1452 1453 /* start processing */ 1454 drv = bdrv_find_format(format); 1455 if (!drv) { 1456 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 1457 return; 1458 } 1459 1460 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1461 has_node_name ? node_name : NULL, 1462 &local_err); 1463 if (local_err) { 1464 error_propagate(errp, local_err); 1465 return; 1466 } 1467 1468 if (has_node_name && !has_snapshot_node_name) { 1469 error_setg(errp, "New snapshot node name missing"); 1470 return; 1471 } 1472 1473 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1474 error_setg(errp, "New snapshot node name already existing"); 1475 return; 1476 } 1477 1478 /* Acquire AioContext now so any threads operating on old_bs stop */ 1479 state->aio_context = bdrv_get_aio_context(state->old_bs); 1480 aio_context_acquire(state->aio_context); 1481 1482 if (!bdrv_is_inserted(state->old_bs)) { 1483 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1484 return; 1485 } 1486 1487 if (bdrv_op_is_blocked(state->old_bs, 1488 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1489 return; 1490 } 1491 1492 if (!bdrv_is_read_only(state->old_bs)) { 1493 if (bdrv_flush(state->old_bs)) { 1494 error_setg(errp, QERR_IO_ERROR); 1495 return; 1496 } 1497 } 1498 1499 if (!bdrv_is_first_non_filter(state->old_bs)) { 1500 error_setg(errp, QERR_FEATURE_DISABLED, "snapshot"); 1501 return; 1502 } 1503 1504 flags = state->old_bs->open_flags; 1505 1506 /* create new image w/backing file */ 1507 if (mode != NEW_IMAGE_MODE_EXISTING) { 1508 bdrv_img_create(new_image_file, format, 1509 state->old_bs->filename, 1510 state->old_bs->drv->format_name, 1511 NULL, -1, flags, &local_err, false); 1512 if (local_err) { 1513 error_propagate(errp, local_err); 1514 return; 1515 } 1516 } 1517 1518 if (has_snapshot_node_name) { 1519 options = qdict_new(); 1520 qdict_put(options, "node-name", 1521 qstring_from_str(snapshot_node_name)); 1522 } 1523 1524 /* TODO Inherit bs->options or only take explicit options with an 1525 * extended QMP command? */ 1526 assert(state->new_bs == NULL); 1527 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1528 flags | BDRV_O_NO_BACKING, drv, &local_err); 1529 /* We will manually add the backing_hd field to the bs later */ 1530 if (ret != 0) { 1531 error_propagate(errp, local_err); 1532 } 1533 } 1534 1535 static void external_snapshot_commit(BlkTransactionState *common) 1536 { 1537 ExternalSnapshotState *state = 1538 DO_UPCAST(ExternalSnapshotState, common, common); 1539 1540 bdrv_set_aio_context(state->new_bs, state->aio_context); 1541 1542 /* This removes our old bs and adds the new bs */ 1543 bdrv_append(state->new_bs, state->old_bs); 1544 /* We don't need (or want) to use the transactional 1545 * bdrv_reopen_multiple() across all the entries at once, because we 1546 * don't want to abort all of them if one of them fails the reopen */ 1547 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1548 NULL); 1549 1550 aio_context_release(state->aio_context); 1551 } 1552 1553 static void external_snapshot_abort(BlkTransactionState *common) 1554 { 1555 ExternalSnapshotState *state = 1556 DO_UPCAST(ExternalSnapshotState, common, common); 1557 if (state->new_bs) { 1558 bdrv_unref(state->new_bs); 1559 } 1560 if (state->aio_context) { 1561 aio_context_release(state->aio_context); 1562 } 1563 } 1564 1565 typedef struct DriveBackupState { 1566 BlkTransactionState common; 1567 BlockDriverState *bs; 1568 AioContext *aio_context; 1569 BlockJob *job; 1570 } DriveBackupState; 1571 1572 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1573 { 1574 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1575 BlockDriverState *bs; 1576 BlockBackend *blk; 1577 DriveBackup *backup; 1578 Error *local_err = NULL; 1579 1580 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1581 backup = common->action->drive_backup; 1582 1583 blk = blk_by_name(backup->device); 1584 if (!blk) { 1585 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1586 "Device '%s' not found", backup->device); 1587 return; 1588 } 1589 bs = blk_bs(blk); 1590 1591 /* AioContext is released in .clean() */ 1592 state->aio_context = bdrv_get_aio_context(bs); 1593 aio_context_acquire(state->aio_context); 1594 1595 qmp_drive_backup(backup->device, backup->target, 1596 backup->has_format, backup->format, 1597 backup->sync, 1598 backup->has_mode, backup->mode, 1599 backup->has_speed, backup->speed, 1600 backup->has_bitmap, backup->bitmap, 1601 backup->has_on_source_error, backup->on_source_error, 1602 backup->has_on_target_error, backup->on_target_error, 1603 &local_err); 1604 if (local_err) { 1605 error_propagate(errp, local_err); 1606 return; 1607 } 1608 1609 state->bs = bs; 1610 state->job = state->bs->job; 1611 } 1612 1613 static void drive_backup_abort(BlkTransactionState *common) 1614 { 1615 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1616 BlockDriverState *bs = state->bs; 1617 1618 /* Only cancel if it's the job we started */ 1619 if (bs && bs->job && bs->job == state->job) { 1620 block_job_cancel_sync(bs->job); 1621 } 1622 } 1623 1624 static void drive_backup_clean(BlkTransactionState *common) 1625 { 1626 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1627 1628 if (state->aio_context) { 1629 aio_context_release(state->aio_context); 1630 } 1631 } 1632 1633 typedef struct BlockdevBackupState { 1634 BlkTransactionState common; 1635 BlockDriverState *bs; 1636 BlockJob *job; 1637 AioContext *aio_context; 1638 } BlockdevBackupState; 1639 1640 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1641 { 1642 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1643 BlockdevBackup *backup; 1644 BlockDriverState *bs, *target; 1645 BlockBackend *blk; 1646 Error *local_err = NULL; 1647 1648 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1649 backup = common->action->blockdev_backup; 1650 1651 blk = blk_by_name(backup->device); 1652 if (!blk) { 1653 error_setg(errp, "Device '%s' not found", backup->device); 1654 return; 1655 } 1656 bs = blk_bs(blk); 1657 1658 blk = blk_by_name(backup->target); 1659 if (!blk) { 1660 error_setg(errp, "Device '%s' not found", backup->target); 1661 return; 1662 } 1663 target = blk_bs(blk); 1664 1665 /* AioContext is released in .clean() */ 1666 state->aio_context = bdrv_get_aio_context(bs); 1667 if (state->aio_context != bdrv_get_aio_context(target)) { 1668 state->aio_context = NULL; 1669 error_setg(errp, "Backup between two IO threads is not implemented"); 1670 return; 1671 } 1672 aio_context_acquire(state->aio_context); 1673 1674 qmp_blockdev_backup(backup->device, backup->target, 1675 backup->sync, 1676 backup->has_speed, backup->speed, 1677 backup->has_on_source_error, backup->on_source_error, 1678 backup->has_on_target_error, backup->on_target_error, 1679 &local_err); 1680 if (local_err) { 1681 error_propagate(errp, local_err); 1682 return; 1683 } 1684 1685 state->bs = bs; 1686 state->job = state->bs->job; 1687 } 1688 1689 static void blockdev_backup_abort(BlkTransactionState *common) 1690 { 1691 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1692 BlockDriverState *bs = state->bs; 1693 1694 /* Only cancel if it's the job we started */ 1695 if (bs && bs->job && bs->job == state->job) { 1696 block_job_cancel_sync(bs->job); 1697 } 1698 } 1699 1700 static void blockdev_backup_clean(BlkTransactionState *common) 1701 { 1702 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1703 1704 if (state->aio_context) { 1705 aio_context_release(state->aio_context); 1706 } 1707 } 1708 1709 static void abort_prepare(BlkTransactionState *common, Error **errp) 1710 { 1711 error_setg(errp, "Transaction aborted using Abort action"); 1712 } 1713 1714 static void abort_commit(BlkTransactionState *common) 1715 { 1716 g_assert_not_reached(); /* this action never succeeds */ 1717 } 1718 1719 static const BdrvActionOps actions[] = { 1720 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1721 .instance_size = sizeof(ExternalSnapshotState), 1722 .prepare = external_snapshot_prepare, 1723 .commit = external_snapshot_commit, 1724 .abort = external_snapshot_abort, 1725 }, 1726 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1727 .instance_size = sizeof(DriveBackupState), 1728 .prepare = drive_backup_prepare, 1729 .abort = drive_backup_abort, 1730 .clean = drive_backup_clean, 1731 }, 1732 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1733 .instance_size = sizeof(BlockdevBackupState), 1734 .prepare = blockdev_backup_prepare, 1735 .abort = blockdev_backup_abort, 1736 .clean = blockdev_backup_clean, 1737 }, 1738 [TRANSACTION_ACTION_KIND_ABORT] = { 1739 .instance_size = sizeof(BlkTransactionState), 1740 .prepare = abort_prepare, 1741 .commit = abort_commit, 1742 }, 1743 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1744 .instance_size = sizeof(InternalSnapshotState), 1745 .prepare = internal_snapshot_prepare, 1746 .abort = internal_snapshot_abort, 1747 .clean = internal_snapshot_clean, 1748 }, 1749 }; 1750 1751 /* 1752 * 'Atomic' group operations. The operations are performed as a set, and if 1753 * any fail then we roll back all operations in the group. 1754 */ 1755 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1756 { 1757 TransactionActionList *dev_entry = dev_list; 1758 BlkTransactionState *state, *next; 1759 Error *local_err = NULL; 1760 1761 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1762 QSIMPLEQ_INIT(&snap_bdrv_states); 1763 1764 /* drain all i/o before any operations */ 1765 bdrv_drain_all(); 1766 1767 /* We don't do anything in this loop that commits us to the operations */ 1768 while (NULL != dev_entry) { 1769 TransactionAction *dev_info = NULL; 1770 const BdrvActionOps *ops; 1771 1772 dev_info = dev_entry->value; 1773 dev_entry = dev_entry->next; 1774 1775 assert(dev_info->kind < ARRAY_SIZE(actions)); 1776 1777 ops = &actions[dev_info->kind]; 1778 assert(ops->instance_size > 0); 1779 1780 state = g_malloc0(ops->instance_size); 1781 state->ops = ops; 1782 state->action = dev_info; 1783 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1784 1785 state->ops->prepare(state, &local_err); 1786 if (local_err) { 1787 error_propagate(errp, local_err); 1788 goto delete_and_fail; 1789 } 1790 } 1791 1792 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1793 if (state->ops->commit) { 1794 state->ops->commit(state); 1795 } 1796 } 1797 1798 /* success */ 1799 goto exit; 1800 1801 delete_and_fail: 1802 /* failure, and it is all-or-none; roll back all operations */ 1803 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1804 if (state->ops->abort) { 1805 state->ops->abort(state); 1806 } 1807 } 1808 exit: 1809 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1810 if (state->ops->clean) { 1811 state->ops->clean(state); 1812 } 1813 g_free(state); 1814 } 1815 } 1816 1817 1818 static void eject_device(BlockBackend *blk, int force, Error **errp) 1819 { 1820 BlockDriverState *bs = blk_bs(blk); 1821 AioContext *aio_context; 1822 1823 aio_context = bdrv_get_aio_context(bs); 1824 aio_context_acquire(aio_context); 1825 1826 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1827 goto out; 1828 } 1829 if (!blk_dev_has_removable_media(blk)) { 1830 error_setg(errp, "Device '%s' is not removable", 1831 bdrv_get_device_name(bs)); 1832 goto out; 1833 } 1834 1835 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1836 blk_dev_eject_request(blk, force); 1837 if (!force) { 1838 error_setg(errp, "Device '%s' is locked", 1839 bdrv_get_device_name(bs)); 1840 goto out; 1841 } 1842 } 1843 1844 bdrv_close(bs); 1845 1846 out: 1847 aio_context_release(aio_context); 1848 } 1849 1850 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1851 { 1852 BlockBackend *blk; 1853 1854 blk = blk_by_name(device); 1855 if (!blk) { 1856 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1857 "Device '%s' not found", device); 1858 return; 1859 } 1860 1861 eject_device(blk, force, errp); 1862 } 1863 1864 void qmp_block_passwd(bool has_device, const char *device, 1865 bool has_node_name, const char *node_name, 1866 const char *password, Error **errp) 1867 { 1868 Error *local_err = NULL; 1869 BlockDriverState *bs; 1870 AioContext *aio_context; 1871 1872 bs = bdrv_lookup_bs(has_device ? device : NULL, 1873 has_node_name ? node_name : NULL, 1874 &local_err); 1875 if (local_err) { 1876 error_propagate(errp, local_err); 1877 return; 1878 } 1879 1880 aio_context = bdrv_get_aio_context(bs); 1881 aio_context_acquire(aio_context); 1882 1883 bdrv_add_key(bs, password, errp); 1884 1885 aio_context_release(aio_context); 1886 } 1887 1888 /* Assumes AioContext is held */ 1889 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1890 int bdrv_flags, BlockDriver *drv, 1891 const char *password, Error **errp) 1892 { 1893 Error *local_err = NULL; 1894 int ret; 1895 1896 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1897 if (ret < 0) { 1898 error_propagate(errp, local_err); 1899 return; 1900 } 1901 1902 bdrv_add_key(bs, password, errp); 1903 } 1904 1905 void qmp_change_blockdev(const char *device, const char *filename, 1906 const char *format, Error **errp) 1907 { 1908 BlockBackend *blk; 1909 BlockDriverState *bs; 1910 AioContext *aio_context; 1911 BlockDriver *drv = NULL; 1912 int bdrv_flags; 1913 Error *err = NULL; 1914 1915 blk = blk_by_name(device); 1916 if (!blk) { 1917 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1918 "Device '%s' not found", device); 1919 return; 1920 } 1921 bs = blk_bs(blk); 1922 1923 aio_context = bdrv_get_aio_context(bs); 1924 aio_context_acquire(aio_context); 1925 1926 if (format) { 1927 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1928 if (!drv) { 1929 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 1930 goto out; 1931 } 1932 } 1933 1934 eject_device(blk, 0, &err); 1935 if (err) { 1936 error_propagate(errp, err); 1937 goto out; 1938 } 1939 1940 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1941 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1942 1943 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1944 1945 out: 1946 aio_context_release(aio_context); 1947 } 1948 1949 /* throttling disk I/O limits */ 1950 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1951 int64_t bps_wr, 1952 int64_t iops, 1953 int64_t iops_rd, 1954 int64_t iops_wr, 1955 bool has_bps_max, 1956 int64_t bps_max, 1957 bool has_bps_rd_max, 1958 int64_t bps_rd_max, 1959 bool has_bps_wr_max, 1960 int64_t bps_wr_max, 1961 bool has_iops_max, 1962 int64_t iops_max, 1963 bool has_iops_rd_max, 1964 int64_t iops_rd_max, 1965 bool has_iops_wr_max, 1966 int64_t iops_wr_max, 1967 bool has_iops_size, 1968 int64_t iops_size, 1969 bool has_group, 1970 const char *group, Error **errp) 1971 { 1972 ThrottleConfig cfg; 1973 BlockDriverState *bs; 1974 BlockBackend *blk; 1975 AioContext *aio_context; 1976 1977 blk = blk_by_name(device); 1978 if (!blk) { 1979 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1980 "Device '%s' not found", device); 1981 return; 1982 } 1983 bs = blk_bs(blk); 1984 1985 memset(&cfg, 0, sizeof(cfg)); 1986 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1987 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1988 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1989 1990 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1991 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1992 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1993 1994 if (has_bps_max) { 1995 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1996 } 1997 if (has_bps_rd_max) { 1998 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1999 } 2000 if (has_bps_wr_max) { 2001 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 2002 } 2003 if (has_iops_max) { 2004 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 2005 } 2006 if (has_iops_rd_max) { 2007 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 2008 } 2009 if (has_iops_wr_max) { 2010 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 2011 } 2012 2013 if (has_iops_size) { 2014 cfg.op_size = iops_size; 2015 } 2016 2017 if (!check_throttle_config(&cfg, errp)) { 2018 return; 2019 } 2020 2021 aio_context = bdrv_get_aio_context(bs); 2022 aio_context_acquire(aio_context); 2023 2024 if (throttle_enabled(&cfg)) { 2025 /* Enable I/O limits if they're not enabled yet, otherwise 2026 * just update the throttling group. */ 2027 if (!bs->io_limits_enabled) { 2028 bdrv_io_limits_enable(bs, has_group ? group : device); 2029 } else if (has_group) { 2030 bdrv_io_limits_update_group(bs, group); 2031 } 2032 /* Set the new throttling configuration */ 2033 bdrv_set_io_limits(bs, &cfg); 2034 } else if (bs->io_limits_enabled) { 2035 /* If all throttling settings are set to 0, disable I/O limits */ 2036 bdrv_io_limits_disable(bs); 2037 } 2038 2039 aio_context_release(aio_context); 2040 } 2041 2042 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2043 bool has_granularity, uint32_t granularity, 2044 Error **errp) 2045 { 2046 AioContext *aio_context; 2047 BlockDriverState *bs; 2048 2049 if (!name || name[0] == '\0') { 2050 error_setg(errp, "Bitmap name cannot be empty"); 2051 return; 2052 } 2053 2054 bs = bdrv_lookup_bs(node, node, errp); 2055 if (!bs) { 2056 return; 2057 } 2058 2059 aio_context = bdrv_get_aio_context(bs); 2060 aio_context_acquire(aio_context); 2061 2062 if (has_granularity) { 2063 if (granularity < 512 || !is_power_of_2(granularity)) { 2064 error_setg(errp, "Granularity must be power of 2 " 2065 "and at least 512"); 2066 goto out; 2067 } 2068 } else { 2069 /* Default to cluster size, if available: */ 2070 granularity = bdrv_get_default_bitmap_granularity(bs); 2071 } 2072 2073 bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2074 2075 out: 2076 aio_context_release(aio_context); 2077 } 2078 2079 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2080 Error **errp) 2081 { 2082 AioContext *aio_context; 2083 BlockDriverState *bs; 2084 BdrvDirtyBitmap *bitmap; 2085 2086 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2087 if (!bitmap || !bs) { 2088 return; 2089 } 2090 2091 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2092 error_setg(errp, 2093 "Bitmap '%s' is currently frozen and cannot be removed", 2094 name); 2095 goto out; 2096 } 2097 bdrv_dirty_bitmap_make_anon(bitmap); 2098 bdrv_release_dirty_bitmap(bs, bitmap); 2099 2100 out: 2101 aio_context_release(aio_context); 2102 } 2103 2104 /** 2105 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2106 * immediately after a full backup operation. 2107 */ 2108 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2109 Error **errp) 2110 { 2111 AioContext *aio_context; 2112 BdrvDirtyBitmap *bitmap; 2113 BlockDriverState *bs; 2114 2115 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2116 if (!bitmap || !bs) { 2117 return; 2118 } 2119 2120 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2121 error_setg(errp, 2122 "Bitmap '%s' is currently frozen and cannot be modified", 2123 name); 2124 goto out; 2125 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 2126 error_setg(errp, 2127 "Bitmap '%s' is currently disabled and cannot be cleared", 2128 name); 2129 goto out; 2130 } 2131 2132 bdrv_clear_dirty_bitmap(bitmap); 2133 2134 out: 2135 aio_context_release(aio_context); 2136 } 2137 2138 void hmp_drive_del(Monitor *mon, const QDict *qdict) 2139 { 2140 const char *id = qdict_get_str(qdict, "id"); 2141 BlockBackend *blk; 2142 BlockDriverState *bs; 2143 AioContext *aio_context; 2144 Error *local_err = NULL; 2145 2146 blk = blk_by_name(id); 2147 if (!blk) { 2148 error_report("Device '%s' not found", id); 2149 return; 2150 } 2151 bs = blk_bs(blk); 2152 2153 if (!blk_legacy_dinfo(blk)) { 2154 error_report("Deleting device added with blockdev-add" 2155 " is not supported"); 2156 return; 2157 } 2158 2159 aio_context = bdrv_get_aio_context(bs); 2160 aio_context_acquire(aio_context); 2161 2162 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2163 error_report_err(local_err); 2164 aio_context_release(aio_context); 2165 return; 2166 } 2167 2168 /* quiesce block driver; prevent further io */ 2169 bdrv_drain_all(); 2170 bdrv_flush(bs); 2171 bdrv_close(bs); 2172 2173 /* if we have a device attached to this BlockDriverState 2174 * then we need to make the drive anonymous until the device 2175 * can be removed. If this is a drive with no device backing 2176 * then we can just get rid of the block driver state right here. 2177 */ 2178 if (blk_get_attached_dev(blk)) { 2179 blk_hide_on_behalf_of_hmp_drive_del(blk); 2180 /* Further I/O must not pause the guest */ 2181 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 2182 BLOCKDEV_ON_ERROR_REPORT); 2183 } else { 2184 blk_unref(blk); 2185 } 2186 2187 aio_context_release(aio_context); 2188 } 2189 2190 void qmp_block_resize(bool has_device, const char *device, 2191 bool has_node_name, const char *node_name, 2192 int64_t size, Error **errp) 2193 { 2194 Error *local_err = NULL; 2195 BlockDriverState *bs; 2196 AioContext *aio_context; 2197 int ret; 2198 2199 bs = bdrv_lookup_bs(has_device ? device : NULL, 2200 has_node_name ? node_name : NULL, 2201 &local_err); 2202 if (local_err) { 2203 error_propagate(errp, local_err); 2204 return; 2205 } 2206 2207 aio_context = bdrv_get_aio_context(bs); 2208 aio_context_acquire(aio_context); 2209 2210 if (!bdrv_is_first_non_filter(bs)) { 2211 error_setg(errp, QERR_FEATURE_DISABLED, "resize"); 2212 goto out; 2213 } 2214 2215 if (size < 0) { 2216 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2217 goto out; 2218 } 2219 2220 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2221 error_setg(errp, QERR_DEVICE_IN_USE, device); 2222 goto out; 2223 } 2224 2225 /* complete all in-flight operations before resizing the device */ 2226 bdrv_drain_all(); 2227 2228 ret = bdrv_truncate(bs, size); 2229 switch (ret) { 2230 case 0: 2231 break; 2232 case -ENOMEDIUM: 2233 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2234 break; 2235 case -ENOTSUP: 2236 error_setg(errp, QERR_UNSUPPORTED); 2237 break; 2238 case -EACCES: 2239 error_setg(errp, "Device '%s' is read only", device); 2240 break; 2241 case -EBUSY: 2242 error_setg(errp, QERR_DEVICE_IN_USE, device); 2243 break; 2244 default: 2245 error_setg_errno(errp, -ret, "Could not resize"); 2246 break; 2247 } 2248 2249 out: 2250 aio_context_release(aio_context); 2251 } 2252 2253 static void block_job_cb(void *opaque, int ret) 2254 { 2255 /* Note that this function may be executed from another AioContext besides 2256 * the QEMU main loop. If you need to access anything that assumes the 2257 * QEMU global mutex, use a BH or introduce a mutex. 2258 */ 2259 2260 BlockDriverState *bs = opaque; 2261 const char *msg = NULL; 2262 2263 trace_block_job_cb(bs, bs->job, ret); 2264 2265 assert(bs->job); 2266 2267 if (ret < 0) { 2268 msg = strerror(-ret); 2269 } 2270 2271 if (block_job_is_cancelled(bs->job)) { 2272 block_job_event_cancelled(bs->job); 2273 } else { 2274 block_job_event_completed(bs->job, msg); 2275 } 2276 2277 bdrv_put_ref_bh_schedule(bs); 2278 } 2279 2280 void qmp_block_stream(const char *device, 2281 bool has_base, const char *base, 2282 bool has_backing_file, const char *backing_file, 2283 bool has_speed, int64_t speed, 2284 bool has_on_error, BlockdevOnError on_error, 2285 Error **errp) 2286 { 2287 BlockBackend *blk; 2288 BlockDriverState *bs; 2289 BlockDriverState *base_bs = NULL; 2290 AioContext *aio_context; 2291 Error *local_err = NULL; 2292 const char *base_name = NULL; 2293 2294 if (!has_on_error) { 2295 on_error = BLOCKDEV_ON_ERROR_REPORT; 2296 } 2297 2298 blk = blk_by_name(device); 2299 if (!blk) { 2300 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2301 "Device '%s' not found", device); 2302 return; 2303 } 2304 bs = blk_bs(blk); 2305 2306 aio_context = bdrv_get_aio_context(bs); 2307 aio_context_acquire(aio_context); 2308 2309 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2310 goto out; 2311 } 2312 2313 if (has_base) { 2314 base_bs = bdrv_find_backing_image(bs, base); 2315 if (base_bs == NULL) { 2316 error_setg(errp, QERR_BASE_NOT_FOUND, base); 2317 goto out; 2318 } 2319 assert(bdrv_get_aio_context(base_bs) == aio_context); 2320 base_name = base; 2321 } 2322 2323 /* if we are streaming the entire chain, the result will have no backing 2324 * file, and specifying one is therefore an error */ 2325 if (base_bs == NULL && has_backing_file) { 2326 error_setg(errp, "backing file specified, but streaming the " 2327 "entire chain"); 2328 goto out; 2329 } 2330 2331 /* backing_file string overrides base bs filename */ 2332 base_name = has_backing_file ? backing_file : base_name; 2333 2334 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2335 on_error, block_job_cb, bs, &local_err); 2336 if (local_err) { 2337 error_propagate(errp, local_err); 2338 goto out; 2339 } 2340 2341 trace_qmp_block_stream(bs, bs->job); 2342 2343 out: 2344 aio_context_release(aio_context); 2345 } 2346 2347 void qmp_block_commit(const char *device, 2348 bool has_base, const char *base, 2349 bool has_top, const char *top, 2350 bool has_backing_file, const char *backing_file, 2351 bool has_speed, int64_t speed, 2352 Error **errp) 2353 { 2354 BlockBackend *blk; 2355 BlockDriverState *bs; 2356 BlockDriverState *base_bs, *top_bs; 2357 AioContext *aio_context; 2358 Error *local_err = NULL; 2359 /* This will be part of the QMP command, if/when the 2360 * BlockdevOnError change for blkmirror makes it in 2361 */ 2362 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2363 2364 if (!has_speed) { 2365 speed = 0; 2366 } 2367 2368 /* Important Note: 2369 * libvirt relies on the DeviceNotFound error class in order to probe for 2370 * live commit feature versions; for this to work, we must make sure to 2371 * perform the device lookup before any generic errors that may occur in a 2372 * scenario in which all optional arguments are omitted. */ 2373 blk = blk_by_name(device); 2374 if (!blk) { 2375 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2376 "Device '%s' not found", device); 2377 return; 2378 } 2379 bs = blk_bs(blk); 2380 2381 aio_context = bdrv_get_aio_context(bs); 2382 aio_context_acquire(aio_context); 2383 2384 /* drain all i/o before commits */ 2385 bdrv_drain_all(); 2386 2387 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2388 goto out; 2389 } 2390 2391 /* default top_bs is the active layer */ 2392 top_bs = bs; 2393 2394 if (has_top && top) { 2395 if (strcmp(bs->filename, top) != 0) { 2396 top_bs = bdrv_find_backing_image(bs, top); 2397 } 2398 } 2399 2400 if (top_bs == NULL) { 2401 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2402 goto out; 2403 } 2404 2405 assert(bdrv_get_aio_context(top_bs) == aio_context); 2406 2407 if (has_base && base) { 2408 base_bs = bdrv_find_backing_image(top_bs, base); 2409 } else { 2410 base_bs = bdrv_find_base(top_bs); 2411 } 2412 2413 if (base_bs == NULL) { 2414 error_setg(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2415 goto out; 2416 } 2417 2418 assert(bdrv_get_aio_context(base_bs) == aio_context); 2419 2420 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2421 goto out; 2422 } 2423 2424 /* Do not allow attempts to commit an image into itself */ 2425 if (top_bs == base_bs) { 2426 error_setg(errp, "cannot commit an image into itself"); 2427 goto out; 2428 } 2429 2430 if (top_bs == bs) { 2431 if (has_backing_file) { 2432 error_setg(errp, "'backing-file' specified," 2433 " but 'top' is the active layer"); 2434 goto out; 2435 } 2436 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2437 bs, &local_err); 2438 } else { 2439 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2440 has_backing_file ? backing_file : NULL, &local_err); 2441 } 2442 if (local_err != NULL) { 2443 error_propagate(errp, local_err); 2444 goto out; 2445 } 2446 2447 out: 2448 aio_context_release(aio_context); 2449 } 2450 2451 void qmp_drive_backup(const char *device, const char *target, 2452 bool has_format, const char *format, 2453 enum MirrorSyncMode sync, 2454 bool has_mode, enum NewImageMode mode, 2455 bool has_speed, int64_t speed, 2456 bool has_bitmap, const char *bitmap, 2457 bool has_on_source_error, BlockdevOnError on_source_error, 2458 bool has_on_target_error, BlockdevOnError on_target_error, 2459 Error **errp) 2460 { 2461 BlockBackend *blk; 2462 BlockDriverState *bs; 2463 BlockDriverState *target_bs; 2464 BlockDriverState *source = NULL; 2465 BdrvDirtyBitmap *bmap = NULL; 2466 AioContext *aio_context; 2467 BlockDriver *drv = NULL; 2468 Error *local_err = NULL; 2469 int flags; 2470 int64_t size; 2471 int ret; 2472 2473 if (!has_speed) { 2474 speed = 0; 2475 } 2476 if (!has_on_source_error) { 2477 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2478 } 2479 if (!has_on_target_error) { 2480 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2481 } 2482 if (!has_mode) { 2483 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2484 } 2485 2486 blk = blk_by_name(device); 2487 if (!blk) { 2488 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2489 "Device '%s' not found", device); 2490 return; 2491 } 2492 bs = blk_bs(blk); 2493 2494 aio_context = bdrv_get_aio_context(bs); 2495 aio_context_acquire(aio_context); 2496 2497 /* Although backup_run has this check too, we need to use bs->drv below, so 2498 * do an early check redundantly. */ 2499 if (!bdrv_is_inserted(bs)) { 2500 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2501 goto out; 2502 } 2503 2504 if (!has_format) { 2505 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2506 } 2507 if (format) { 2508 drv = bdrv_find_format(format); 2509 if (!drv) { 2510 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 2511 goto out; 2512 } 2513 } 2514 2515 /* Early check to avoid creating target */ 2516 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2517 goto out; 2518 } 2519 2520 flags = bs->open_flags | BDRV_O_RDWR; 2521 2522 /* See if we have a backing HD we can use to create our new image 2523 * on top of. */ 2524 if (sync == MIRROR_SYNC_MODE_TOP) { 2525 source = bs->backing_hd; 2526 if (!source) { 2527 sync = MIRROR_SYNC_MODE_FULL; 2528 } 2529 } 2530 if (sync == MIRROR_SYNC_MODE_NONE) { 2531 source = bs; 2532 } 2533 2534 size = bdrv_getlength(bs); 2535 if (size < 0) { 2536 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2537 goto out; 2538 } 2539 2540 if (mode != NEW_IMAGE_MODE_EXISTING) { 2541 assert(format && drv); 2542 if (source) { 2543 bdrv_img_create(target, format, source->filename, 2544 source->drv->format_name, NULL, 2545 size, flags, &local_err, false); 2546 } else { 2547 bdrv_img_create(target, format, NULL, NULL, NULL, 2548 size, flags, &local_err, false); 2549 } 2550 } 2551 2552 if (local_err) { 2553 error_propagate(errp, local_err); 2554 goto out; 2555 } 2556 2557 target_bs = NULL; 2558 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2559 if (ret < 0) { 2560 error_propagate(errp, local_err); 2561 goto out; 2562 } 2563 2564 bdrv_set_aio_context(target_bs, aio_context); 2565 2566 if (has_bitmap) { 2567 bmap = bdrv_find_dirty_bitmap(bs, bitmap); 2568 if (!bmap) { 2569 error_setg(errp, "Bitmap '%s' could not be found", bitmap); 2570 goto out; 2571 } 2572 } 2573 2574 backup_start(bs, target_bs, speed, sync, bmap, 2575 on_source_error, on_target_error, 2576 block_job_cb, bs, &local_err); 2577 if (local_err != NULL) { 2578 bdrv_unref(target_bs); 2579 error_propagate(errp, local_err); 2580 goto out; 2581 } 2582 2583 out: 2584 aio_context_release(aio_context); 2585 } 2586 2587 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2588 { 2589 return bdrv_named_nodes_list(errp); 2590 } 2591 2592 void qmp_blockdev_backup(const char *device, const char *target, 2593 enum MirrorSyncMode sync, 2594 bool has_speed, int64_t speed, 2595 bool has_on_source_error, 2596 BlockdevOnError on_source_error, 2597 bool has_on_target_error, 2598 BlockdevOnError on_target_error, 2599 Error **errp) 2600 { 2601 BlockBackend *blk; 2602 BlockDriverState *bs; 2603 BlockDriverState *target_bs; 2604 Error *local_err = NULL; 2605 AioContext *aio_context; 2606 2607 if (!has_speed) { 2608 speed = 0; 2609 } 2610 if (!has_on_source_error) { 2611 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2612 } 2613 if (!has_on_target_error) { 2614 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2615 } 2616 2617 blk = blk_by_name(device); 2618 if (!blk) { 2619 error_setg(errp, "Device '%s' not found", device); 2620 return; 2621 } 2622 bs = blk_bs(blk); 2623 2624 aio_context = bdrv_get_aio_context(bs); 2625 aio_context_acquire(aio_context); 2626 2627 blk = blk_by_name(target); 2628 if (!blk) { 2629 error_setg(errp, "Device '%s' not found", target); 2630 goto out; 2631 } 2632 target_bs = blk_bs(blk); 2633 2634 bdrv_ref(target_bs); 2635 bdrv_set_aio_context(target_bs, aio_context); 2636 backup_start(bs, target_bs, speed, sync, NULL, on_source_error, 2637 on_target_error, block_job_cb, bs, &local_err); 2638 if (local_err != NULL) { 2639 bdrv_unref(target_bs); 2640 error_propagate(errp, local_err); 2641 } 2642 out: 2643 aio_context_release(aio_context); 2644 } 2645 2646 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2647 2648 void qmp_drive_mirror(const char *device, const char *target, 2649 bool has_format, const char *format, 2650 bool has_node_name, const char *node_name, 2651 bool has_replaces, const char *replaces, 2652 enum MirrorSyncMode sync, 2653 bool has_mode, enum NewImageMode mode, 2654 bool has_speed, int64_t speed, 2655 bool has_granularity, uint32_t granularity, 2656 bool has_buf_size, int64_t buf_size, 2657 bool has_on_source_error, BlockdevOnError on_source_error, 2658 bool has_on_target_error, BlockdevOnError on_target_error, 2659 Error **errp) 2660 { 2661 BlockBackend *blk; 2662 BlockDriverState *bs; 2663 BlockDriverState *source, *target_bs; 2664 AioContext *aio_context; 2665 BlockDriver *drv = NULL; 2666 Error *local_err = NULL; 2667 QDict *options = NULL; 2668 int flags; 2669 int64_t size; 2670 int ret; 2671 2672 if (!has_speed) { 2673 speed = 0; 2674 } 2675 if (!has_on_source_error) { 2676 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2677 } 2678 if (!has_on_target_error) { 2679 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2680 } 2681 if (!has_mode) { 2682 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2683 } 2684 if (!has_granularity) { 2685 granularity = 0; 2686 } 2687 if (!has_buf_size) { 2688 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2689 } 2690 2691 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2692 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2693 "a value in range [512B, 64MB]"); 2694 return; 2695 } 2696 if (granularity & (granularity - 1)) { 2697 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2698 "power of 2"); 2699 return; 2700 } 2701 2702 blk = blk_by_name(device); 2703 if (!blk) { 2704 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2705 "Device '%s' not found", device); 2706 return; 2707 } 2708 bs = blk_bs(blk); 2709 2710 aio_context = bdrv_get_aio_context(bs); 2711 aio_context_acquire(aio_context); 2712 2713 if (!bdrv_is_inserted(bs)) { 2714 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2715 goto out; 2716 } 2717 2718 if (!has_format) { 2719 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2720 } 2721 if (format) { 2722 drv = bdrv_find_format(format); 2723 if (!drv) { 2724 error_setg(errp, QERR_INVALID_BLOCK_FORMAT, format); 2725 goto out; 2726 } 2727 } 2728 2729 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2730 goto out; 2731 } 2732 2733 flags = bs->open_flags | BDRV_O_RDWR; 2734 source = bs->backing_hd; 2735 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2736 sync = MIRROR_SYNC_MODE_FULL; 2737 } 2738 if (sync == MIRROR_SYNC_MODE_NONE) { 2739 source = bs; 2740 } 2741 2742 size = bdrv_getlength(bs); 2743 if (size < 0) { 2744 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2745 goto out; 2746 } 2747 2748 if (has_replaces) { 2749 BlockDriverState *to_replace_bs; 2750 AioContext *replace_aio_context; 2751 int64_t replace_size; 2752 2753 if (!has_node_name) { 2754 error_setg(errp, "a node-name must be provided when replacing a" 2755 " named node of the graph"); 2756 goto out; 2757 } 2758 2759 to_replace_bs = check_to_replace_node(replaces, &local_err); 2760 2761 if (!to_replace_bs) { 2762 error_propagate(errp, local_err); 2763 goto out; 2764 } 2765 2766 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2767 aio_context_acquire(replace_aio_context); 2768 replace_size = bdrv_getlength(to_replace_bs); 2769 aio_context_release(replace_aio_context); 2770 2771 if (size != replace_size) { 2772 error_setg(errp, "cannot replace image with a mirror image of " 2773 "different size"); 2774 goto out; 2775 } 2776 } 2777 2778 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2779 && mode != NEW_IMAGE_MODE_EXISTING) 2780 { 2781 /* create new image w/o backing file */ 2782 assert(format && drv); 2783 bdrv_img_create(target, format, 2784 NULL, NULL, NULL, size, flags, &local_err, false); 2785 } else { 2786 switch (mode) { 2787 case NEW_IMAGE_MODE_EXISTING: 2788 break; 2789 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2790 /* create new image with backing file */ 2791 bdrv_img_create(target, format, 2792 source->filename, 2793 source->drv->format_name, 2794 NULL, size, flags, &local_err, false); 2795 break; 2796 default: 2797 abort(); 2798 } 2799 } 2800 2801 if (local_err) { 2802 error_propagate(errp, local_err); 2803 goto out; 2804 } 2805 2806 if (has_node_name) { 2807 options = qdict_new(); 2808 qdict_put(options, "node-name", qstring_from_str(node_name)); 2809 } 2810 2811 /* Mirroring takes care of copy-on-write using the source's backing 2812 * file. 2813 */ 2814 target_bs = NULL; 2815 ret = bdrv_open(&target_bs, target, NULL, options, 2816 flags | BDRV_O_NO_BACKING, drv, &local_err); 2817 if (ret < 0) { 2818 error_propagate(errp, local_err); 2819 goto out; 2820 } 2821 2822 bdrv_set_aio_context(target_bs, aio_context); 2823 2824 /* pass the node name to replace to mirror start since it's loose coupling 2825 * and will allow to check whether the node still exist at mirror completion 2826 */ 2827 mirror_start(bs, target_bs, 2828 has_replaces ? replaces : NULL, 2829 speed, granularity, buf_size, sync, 2830 on_source_error, on_target_error, 2831 block_job_cb, bs, &local_err); 2832 if (local_err != NULL) { 2833 bdrv_unref(target_bs); 2834 error_propagate(errp, local_err); 2835 goto out; 2836 } 2837 2838 out: 2839 aio_context_release(aio_context); 2840 } 2841 2842 /* Get the block job for a given device name and acquire its AioContext */ 2843 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 2844 Error **errp) 2845 { 2846 BlockBackend *blk; 2847 BlockDriverState *bs; 2848 2849 blk = blk_by_name(device); 2850 if (!blk) { 2851 goto notfound; 2852 } 2853 bs = blk_bs(blk); 2854 2855 *aio_context = bdrv_get_aio_context(bs); 2856 aio_context_acquire(*aio_context); 2857 2858 if (!bs->job) { 2859 aio_context_release(*aio_context); 2860 goto notfound; 2861 } 2862 2863 return bs->job; 2864 2865 notfound: 2866 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 2867 "No active block job on device '%s'", device); 2868 *aio_context = NULL; 2869 return NULL; 2870 } 2871 2872 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2873 { 2874 AioContext *aio_context; 2875 BlockJob *job = find_block_job(device, &aio_context, errp); 2876 2877 if (!job) { 2878 return; 2879 } 2880 2881 block_job_set_speed(job, speed, errp); 2882 aio_context_release(aio_context); 2883 } 2884 2885 void qmp_block_job_cancel(const char *device, 2886 bool has_force, bool force, Error **errp) 2887 { 2888 AioContext *aio_context; 2889 BlockJob *job = find_block_job(device, &aio_context, errp); 2890 2891 if (!job) { 2892 return; 2893 } 2894 2895 if (!has_force) { 2896 force = false; 2897 } 2898 2899 if (job->user_paused && !force) { 2900 error_setg(errp, "The block job for device '%s' is currently paused", 2901 device); 2902 goto out; 2903 } 2904 2905 trace_qmp_block_job_cancel(job); 2906 block_job_cancel(job); 2907 out: 2908 aio_context_release(aio_context); 2909 } 2910 2911 void qmp_block_job_pause(const char *device, Error **errp) 2912 { 2913 AioContext *aio_context; 2914 BlockJob *job = find_block_job(device, &aio_context, errp); 2915 2916 if (!job || job->user_paused) { 2917 return; 2918 } 2919 2920 job->user_paused = true; 2921 trace_qmp_block_job_pause(job); 2922 block_job_pause(job); 2923 aio_context_release(aio_context); 2924 } 2925 2926 void qmp_block_job_resume(const char *device, Error **errp) 2927 { 2928 AioContext *aio_context; 2929 BlockJob *job = find_block_job(device, &aio_context, errp); 2930 2931 if (!job || !job->user_paused) { 2932 return; 2933 } 2934 2935 job->user_paused = false; 2936 trace_qmp_block_job_resume(job); 2937 block_job_resume(job); 2938 aio_context_release(aio_context); 2939 } 2940 2941 void qmp_block_job_complete(const char *device, Error **errp) 2942 { 2943 AioContext *aio_context; 2944 BlockJob *job = find_block_job(device, &aio_context, errp); 2945 2946 if (!job) { 2947 return; 2948 } 2949 2950 trace_qmp_block_job_complete(job); 2951 block_job_complete(job, errp); 2952 aio_context_release(aio_context); 2953 } 2954 2955 void qmp_change_backing_file(const char *device, 2956 const char *image_node_name, 2957 const char *backing_file, 2958 Error **errp) 2959 { 2960 BlockBackend *blk; 2961 BlockDriverState *bs = NULL; 2962 AioContext *aio_context; 2963 BlockDriverState *image_bs = NULL; 2964 Error *local_err = NULL; 2965 bool ro; 2966 int open_flags; 2967 int ret; 2968 2969 blk = blk_by_name(device); 2970 if (!blk) { 2971 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 2972 "Device '%s' not found", device); 2973 return; 2974 } 2975 bs = blk_bs(blk); 2976 2977 aio_context = bdrv_get_aio_context(bs); 2978 aio_context_acquire(aio_context); 2979 2980 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2981 if (local_err) { 2982 error_propagate(errp, local_err); 2983 goto out; 2984 } 2985 2986 if (!image_bs) { 2987 error_setg(errp, "image file not found"); 2988 goto out; 2989 } 2990 2991 if (bdrv_find_base(image_bs) == image_bs) { 2992 error_setg(errp, "not allowing backing file change on an image " 2993 "without a backing file"); 2994 goto out; 2995 } 2996 2997 /* even though we are not necessarily operating on bs, we need it to 2998 * determine if block ops are currently prohibited on the chain */ 2999 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 3000 goto out; 3001 } 3002 3003 /* final sanity check */ 3004 if (!bdrv_chain_contains(bs, image_bs)) { 3005 error_setg(errp, "'%s' and image file are not in the same chain", 3006 device); 3007 goto out; 3008 } 3009 3010 /* if not r/w, reopen to make r/w */ 3011 open_flags = image_bs->open_flags; 3012 ro = bdrv_is_read_only(image_bs); 3013 3014 if (ro) { 3015 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 3016 if (local_err) { 3017 error_propagate(errp, local_err); 3018 goto out; 3019 } 3020 } 3021 3022 ret = bdrv_change_backing_file(image_bs, backing_file, 3023 image_bs->drv ? image_bs->drv->format_name : ""); 3024 3025 if (ret < 0) { 3026 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 3027 backing_file); 3028 /* don't exit here, so we can try to restore open flags if 3029 * appropriate */ 3030 } 3031 3032 if (ro) { 3033 bdrv_reopen(image_bs, open_flags, &local_err); 3034 if (local_err) { 3035 error_propagate(errp, local_err); /* will preserve prior errp */ 3036 } 3037 } 3038 3039 out: 3040 aio_context_release(aio_context); 3041 } 3042 3043 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3044 { 3045 QmpOutputVisitor *ov = qmp_output_visitor_new(); 3046 BlockBackend *blk; 3047 QObject *obj; 3048 QDict *qdict; 3049 Error *local_err = NULL; 3050 3051 /* Require an ID in the top level */ 3052 if (!options->has_id) { 3053 error_setg(errp, "Block device needs an ID"); 3054 goto fail; 3055 } 3056 3057 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 3058 * cache.direct=false instead of silently switching to aio=threads, except 3059 * when called from drive_new(). 3060 * 3061 * For now, simply forbidding the combination for all drivers will do. */ 3062 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 3063 bool direct = options->has_cache && 3064 options->cache->has_direct && 3065 options->cache->direct; 3066 if (!direct) { 3067 error_setg(errp, "aio=native requires cache.direct=true"); 3068 goto fail; 3069 } 3070 } 3071 3072 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 3073 &options, NULL, &local_err); 3074 if (local_err) { 3075 error_propagate(errp, local_err); 3076 goto fail; 3077 } 3078 3079 obj = qmp_output_get_qobject(ov); 3080 qdict = qobject_to_qdict(obj); 3081 3082 qdict_flatten(qdict); 3083 3084 blk = blockdev_init(NULL, qdict, &local_err); 3085 if (local_err) { 3086 error_propagate(errp, local_err); 3087 goto fail; 3088 } 3089 3090 if (bdrv_key_required(blk_bs(blk))) { 3091 blk_unref(blk); 3092 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 3093 goto fail; 3094 } 3095 3096 fail: 3097 qmp_output_visitor_cleanup(ov); 3098 } 3099 3100 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3101 { 3102 BlockJobInfoList *head = NULL, **p_next = &head; 3103 BlockDriverState *bs; 3104 3105 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 3106 AioContext *aio_context = bdrv_get_aio_context(bs); 3107 3108 aio_context_acquire(aio_context); 3109 3110 if (bs->job) { 3111 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 3112 elem->value = block_job_query(bs->job); 3113 *p_next = elem; 3114 p_next = &elem->next; 3115 } 3116 3117 aio_context_release(aio_context); 3118 } 3119 3120 return head; 3121 } 3122 3123 QemuOptsList qemu_common_drive_opts = { 3124 .name = "drive", 3125 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3126 .desc = { 3127 { 3128 .name = "snapshot", 3129 .type = QEMU_OPT_BOOL, 3130 .help = "enable/disable snapshot mode", 3131 },{ 3132 .name = "discard", 3133 .type = QEMU_OPT_STRING, 3134 .help = "discard operation (ignore/off, unmap/on)", 3135 },{ 3136 .name = BDRV_OPT_CACHE_WB, 3137 .type = QEMU_OPT_BOOL, 3138 .help = "enables writeback mode for any caches", 3139 },{ 3140 .name = BDRV_OPT_CACHE_DIRECT, 3141 .type = QEMU_OPT_BOOL, 3142 .help = "enables use of O_DIRECT (bypass the host page cache)", 3143 },{ 3144 .name = BDRV_OPT_CACHE_NO_FLUSH, 3145 .type = QEMU_OPT_BOOL, 3146 .help = "ignore any flush requests for the device", 3147 },{ 3148 .name = "aio", 3149 .type = QEMU_OPT_STRING, 3150 .help = "host AIO implementation (threads, native)", 3151 },{ 3152 .name = "format", 3153 .type = QEMU_OPT_STRING, 3154 .help = "disk format (raw, qcow2, ...)", 3155 },{ 3156 .name = "rerror", 3157 .type = QEMU_OPT_STRING, 3158 .help = "read error action", 3159 },{ 3160 .name = "werror", 3161 .type = QEMU_OPT_STRING, 3162 .help = "write error action", 3163 },{ 3164 .name = "read-only", 3165 .type = QEMU_OPT_BOOL, 3166 .help = "open drive file as read-only", 3167 },{ 3168 .name = "throttling.iops-total", 3169 .type = QEMU_OPT_NUMBER, 3170 .help = "limit total I/O operations per second", 3171 },{ 3172 .name = "throttling.iops-read", 3173 .type = QEMU_OPT_NUMBER, 3174 .help = "limit read operations per second", 3175 },{ 3176 .name = "throttling.iops-write", 3177 .type = QEMU_OPT_NUMBER, 3178 .help = "limit write operations per second", 3179 },{ 3180 .name = "throttling.bps-total", 3181 .type = QEMU_OPT_NUMBER, 3182 .help = "limit total bytes per second", 3183 },{ 3184 .name = "throttling.bps-read", 3185 .type = QEMU_OPT_NUMBER, 3186 .help = "limit read bytes per second", 3187 },{ 3188 .name = "throttling.bps-write", 3189 .type = QEMU_OPT_NUMBER, 3190 .help = "limit write bytes per second", 3191 },{ 3192 .name = "throttling.iops-total-max", 3193 .type = QEMU_OPT_NUMBER, 3194 .help = "I/O operations burst", 3195 },{ 3196 .name = "throttling.iops-read-max", 3197 .type = QEMU_OPT_NUMBER, 3198 .help = "I/O operations read burst", 3199 },{ 3200 .name = "throttling.iops-write-max", 3201 .type = QEMU_OPT_NUMBER, 3202 .help = "I/O operations write burst", 3203 },{ 3204 .name = "throttling.bps-total-max", 3205 .type = QEMU_OPT_NUMBER, 3206 .help = "total bytes burst", 3207 },{ 3208 .name = "throttling.bps-read-max", 3209 .type = QEMU_OPT_NUMBER, 3210 .help = "total bytes read burst", 3211 },{ 3212 .name = "throttling.bps-write-max", 3213 .type = QEMU_OPT_NUMBER, 3214 .help = "total bytes write burst", 3215 },{ 3216 .name = "throttling.iops-size", 3217 .type = QEMU_OPT_NUMBER, 3218 .help = "when limiting by iops max size of an I/O in bytes", 3219 },{ 3220 .name = "throttling.group", 3221 .type = QEMU_OPT_STRING, 3222 .help = "name of the block throttling group", 3223 },{ 3224 .name = "copy-on-read", 3225 .type = QEMU_OPT_BOOL, 3226 .help = "copy read data from backing file into image file", 3227 },{ 3228 .name = "detect-zeroes", 3229 .type = QEMU_OPT_STRING, 3230 .help = "try to optimize zero writes (off, on, unmap)", 3231 }, 3232 { /* end of list */ } 3233 }, 3234 }; 3235 3236 QemuOptsList qemu_drive_opts = { 3237 .name = "drive", 3238 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3239 .desc = { 3240 /* 3241 * no elements => accept any params 3242 * validation will happen later 3243 */ 3244 { /* end of list */ } 3245 }, 3246 }; 3247