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_bitmap, backup->bitmap, 1589 backup->has_on_source_error, backup->on_source_error, 1590 backup->has_on_target_error, backup->on_target_error, 1591 &local_err); 1592 if (local_err) { 1593 error_propagate(errp, local_err); 1594 return; 1595 } 1596 1597 state->bs = bs; 1598 state->job = state->bs->job; 1599 } 1600 1601 static void drive_backup_abort(BlkTransactionState *common) 1602 { 1603 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1604 BlockDriverState *bs = state->bs; 1605 1606 /* Only cancel if it's the job we started */ 1607 if (bs && bs->job && bs->job == state->job) { 1608 block_job_cancel_sync(bs->job); 1609 } 1610 } 1611 1612 static void drive_backup_clean(BlkTransactionState *common) 1613 { 1614 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1615 1616 if (state->aio_context) { 1617 aio_context_release(state->aio_context); 1618 } 1619 } 1620 1621 typedef struct BlockdevBackupState { 1622 BlkTransactionState common; 1623 BlockDriverState *bs; 1624 BlockJob *job; 1625 AioContext *aio_context; 1626 } BlockdevBackupState; 1627 1628 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1629 { 1630 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1631 BlockdevBackup *backup; 1632 BlockDriverState *bs, *target; 1633 BlockBackend *blk; 1634 Error *local_err = NULL; 1635 1636 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1637 backup = common->action->blockdev_backup; 1638 1639 blk = blk_by_name(backup->device); 1640 if (!blk) { 1641 error_setg(errp, "Device '%s' not found", backup->device); 1642 return; 1643 } 1644 bs = blk_bs(blk); 1645 1646 blk = blk_by_name(backup->target); 1647 if (!blk) { 1648 error_setg(errp, "Device '%s' not found", backup->target); 1649 return; 1650 } 1651 target = blk_bs(blk); 1652 1653 /* AioContext is released in .clean() */ 1654 state->aio_context = bdrv_get_aio_context(bs); 1655 if (state->aio_context != bdrv_get_aio_context(target)) { 1656 state->aio_context = NULL; 1657 error_setg(errp, "Backup between two IO threads is not implemented"); 1658 return; 1659 } 1660 aio_context_acquire(state->aio_context); 1661 1662 qmp_blockdev_backup(backup->device, backup->target, 1663 backup->sync, 1664 backup->has_speed, backup->speed, 1665 backup->has_on_source_error, backup->on_source_error, 1666 backup->has_on_target_error, backup->on_target_error, 1667 &local_err); 1668 if (local_err) { 1669 error_propagate(errp, local_err); 1670 return; 1671 } 1672 1673 state->bs = bs; 1674 state->job = state->bs->job; 1675 } 1676 1677 static void blockdev_backup_abort(BlkTransactionState *common) 1678 { 1679 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1680 BlockDriverState *bs = state->bs; 1681 1682 /* Only cancel if it's the job we started */ 1683 if (bs && bs->job && bs->job == state->job) { 1684 block_job_cancel_sync(bs->job); 1685 } 1686 } 1687 1688 static void blockdev_backup_clean(BlkTransactionState *common) 1689 { 1690 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1691 1692 if (state->aio_context) { 1693 aio_context_release(state->aio_context); 1694 } 1695 } 1696 1697 static void abort_prepare(BlkTransactionState *common, Error **errp) 1698 { 1699 error_setg(errp, "Transaction aborted using Abort action"); 1700 } 1701 1702 static void abort_commit(BlkTransactionState *common) 1703 { 1704 g_assert_not_reached(); /* this action never succeeds */ 1705 } 1706 1707 static const BdrvActionOps actions[] = { 1708 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1709 .instance_size = sizeof(ExternalSnapshotState), 1710 .prepare = external_snapshot_prepare, 1711 .commit = external_snapshot_commit, 1712 .abort = external_snapshot_abort, 1713 }, 1714 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1715 .instance_size = sizeof(DriveBackupState), 1716 .prepare = drive_backup_prepare, 1717 .abort = drive_backup_abort, 1718 .clean = drive_backup_clean, 1719 }, 1720 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1721 .instance_size = sizeof(BlockdevBackupState), 1722 .prepare = blockdev_backup_prepare, 1723 .abort = blockdev_backup_abort, 1724 .clean = blockdev_backup_clean, 1725 }, 1726 [TRANSACTION_ACTION_KIND_ABORT] = { 1727 .instance_size = sizeof(BlkTransactionState), 1728 .prepare = abort_prepare, 1729 .commit = abort_commit, 1730 }, 1731 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1732 .instance_size = sizeof(InternalSnapshotState), 1733 .prepare = internal_snapshot_prepare, 1734 .abort = internal_snapshot_abort, 1735 .clean = internal_snapshot_clean, 1736 }, 1737 }; 1738 1739 /* 1740 * 'Atomic' group operations. The operations are performed as a set, and if 1741 * any fail then we roll back all operations in the group. 1742 */ 1743 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1744 { 1745 TransactionActionList *dev_entry = dev_list; 1746 BlkTransactionState *state, *next; 1747 Error *local_err = NULL; 1748 1749 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1750 QSIMPLEQ_INIT(&snap_bdrv_states); 1751 1752 /* drain all i/o before any operations */ 1753 bdrv_drain_all(); 1754 1755 /* We don't do anything in this loop that commits us to the operations */ 1756 while (NULL != dev_entry) { 1757 TransactionAction *dev_info = NULL; 1758 const BdrvActionOps *ops; 1759 1760 dev_info = dev_entry->value; 1761 dev_entry = dev_entry->next; 1762 1763 assert(dev_info->kind < ARRAY_SIZE(actions)); 1764 1765 ops = &actions[dev_info->kind]; 1766 assert(ops->instance_size > 0); 1767 1768 state = g_malloc0(ops->instance_size); 1769 state->ops = ops; 1770 state->action = dev_info; 1771 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1772 1773 state->ops->prepare(state, &local_err); 1774 if (local_err) { 1775 error_propagate(errp, local_err); 1776 goto delete_and_fail; 1777 } 1778 } 1779 1780 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1781 if (state->ops->commit) { 1782 state->ops->commit(state); 1783 } 1784 } 1785 1786 /* success */ 1787 goto exit; 1788 1789 delete_and_fail: 1790 /* failure, and it is all-or-none; roll back all operations */ 1791 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1792 if (state->ops->abort) { 1793 state->ops->abort(state); 1794 } 1795 } 1796 exit: 1797 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1798 if (state->ops->clean) { 1799 state->ops->clean(state); 1800 } 1801 g_free(state); 1802 } 1803 } 1804 1805 1806 static void eject_device(BlockBackend *blk, int force, Error **errp) 1807 { 1808 BlockDriverState *bs = blk_bs(blk); 1809 AioContext *aio_context; 1810 1811 aio_context = bdrv_get_aio_context(bs); 1812 aio_context_acquire(aio_context); 1813 1814 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1815 goto out; 1816 } 1817 if (!blk_dev_has_removable_media(blk)) { 1818 error_setg(errp, "Device '%s' is not removable", 1819 bdrv_get_device_name(bs)); 1820 goto out; 1821 } 1822 1823 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1824 blk_dev_eject_request(blk, force); 1825 if (!force) { 1826 error_setg(errp, "Device '%s' is locked", 1827 bdrv_get_device_name(bs)); 1828 goto out; 1829 } 1830 } 1831 1832 bdrv_close(bs); 1833 1834 out: 1835 aio_context_release(aio_context); 1836 } 1837 1838 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1839 { 1840 BlockBackend *blk; 1841 1842 blk = blk_by_name(device); 1843 if (!blk) { 1844 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1845 return; 1846 } 1847 1848 eject_device(blk, force, errp); 1849 } 1850 1851 void qmp_block_passwd(bool has_device, const char *device, 1852 bool has_node_name, const char *node_name, 1853 const char *password, Error **errp) 1854 { 1855 Error *local_err = NULL; 1856 BlockDriverState *bs; 1857 AioContext *aio_context; 1858 1859 bs = bdrv_lookup_bs(has_device ? device : NULL, 1860 has_node_name ? node_name : NULL, 1861 &local_err); 1862 if (local_err) { 1863 error_propagate(errp, local_err); 1864 return; 1865 } 1866 1867 aio_context = bdrv_get_aio_context(bs); 1868 aio_context_acquire(aio_context); 1869 1870 bdrv_add_key(bs, password, errp); 1871 1872 aio_context_release(aio_context); 1873 } 1874 1875 /* Assumes AioContext is held */ 1876 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1877 int bdrv_flags, BlockDriver *drv, 1878 const char *password, Error **errp) 1879 { 1880 Error *local_err = NULL; 1881 int ret; 1882 1883 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1884 if (ret < 0) { 1885 error_propagate(errp, local_err); 1886 return; 1887 } 1888 1889 bdrv_add_key(bs, password, errp); 1890 } 1891 1892 void qmp_change_blockdev(const char *device, const char *filename, 1893 const char *format, Error **errp) 1894 { 1895 BlockBackend *blk; 1896 BlockDriverState *bs; 1897 AioContext *aio_context; 1898 BlockDriver *drv = NULL; 1899 int bdrv_flags; 1900 Error *err = NULL; 1901 1902 blk = blk_by_name(device); 1903 if (!blk) { 1904 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1905 return; 1906 } 1907 bs = blk_bs(blk); 1908 1909 aio_context = bdrv_get_aio_context(bs); 1910 aio_context_acquire(aio_context); 1911 1912 if (format) { 1913 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1914 if (!drv) { 1915 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1916 goto out; 1917 } 1918 } 1919 1920 eject_device(blk, 0, &err); 1921 if (err) { 1922 error_propagate(errp, err); 1923 goto out; 1924 } 1925 1926 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1927 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1928 1929 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1930 1931 out: 1932 aio_context_release(aio_context); 1933 } 1934 1935 /* throttling disk I/O limits */ 1936 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1937 int64_t bps_wr, 1938 int64_t iops, 1939 int64_t iops_rd, 1940 int64_t iops_wr, 1941 bool has_bps_max, 1942 int64_t bps_max, 1943 bool has_bps_rd_max, 1944 int64_t bps_rd_max, 1945 bool has_bps_wr_max, 1946 int64_t bps_wr_max, 1947 bool has_iops_max, 1948 int64_t iops_max, 1949 bool has_iops_rd_max, 1950 int64_t iops_rd_max, 1951 bool has_iops_wr_max, 1952 int64_t iops_wr_max, 1953 bool has_iops_size, 1954 int64_t iops_size, Error **errp) 1955 { 1956 ThrottleConfig cfg; 1957 BlockDriverState *bs; 1958 BlockBackend *blk; 1959 AioContext *aio_context; 1960 1961 blk = blk_by_name(device); 1962 if (!blk) { 1963 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1964 return; 1965 } 1966 bs = blk_bs(blk); 1967 1968 memset(&cfg, 0, sizeof(cfg)); 1969 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1970 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1971 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1972 1973 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1974 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1975 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1976 1977 if (has_bps_max) { 1978 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1979 } 1980 if (has_bps_rd_max) { 1981 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1982 } 1983 if (has_bps_wr_max) { 1984 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1985 } 1986 if (has_iops_max) { 1987 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1988 } 1989 if (has_iops_rd_max) { 1990 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1991 } 1992 if (has_iops_wr_max) { 1993 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1994 } 1995 1996 if (has_iops_size) { 1997 cfg.op_size = iops_size; 1998 } 1999 2000 if (!check_throttle_config(&cfg, errp)) { 2001 return; 2002 } 2003 2004 aio_context = bdrv_get_aio_context(bs); 2005 aio_context_acquire(aio_context); 2006 2007 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 2008 bdrv_io_limits_enable(bs); 2009 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 2010 bdrv_io_limits_disable(bs); 2011 } 2012 2013 if (bs->io_limits_enabled) { 2014 bdrv_set_io_limits(bs, &cfg); 2015 } 2016 2017 aio_context_release(aio_context); 2018 } 2019 2020 void qmp_block_dirty_bitmap_add(const char *node, const char *name, 2021 bool has_granularity, uint32_t granularity, 2022 Error **errp) 2023 { 2024 AioContext *aio_context; 2025 BlockDriverState *bs; 2026 2027 if (!name || name[0] == '\0') { 2028 error_setg(errp, "Bitmap name cannot be empty"); 2029 return; 2030 } 2031 2032 bs = bdrv_lookup_bs(node, node, errp); 2033 if (!bs) { 2034 return; 2035 } 2036 2037 aio_context = bdrv_get_aio_context(bs); 2038 aio_context_acquire(aio_context); 2039 2040 if (has_granularity) { 2041 if (granularity < 512 || !is_power_of_2(granularity)) { 2042 error_setg(errp, "Granularity must be power of 2 " 2043 "and at least 512"); 2044 goto out; 2045 } 2046 } else { 2047 /* Default to cluster size, if available: */ 2048 granularity = bdrv_get_default_bitmap_granularity(bs); 2049 } 2050 2051 bdrv_create_dirty_bitmap(bs, granularity, name, errp); 2052 2053 out: 2054 aio_context_release(aio_context); 2055 } 2056 2057 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, 2058 Error **errp) 2059 { 2060 AioContext *aio_context; 2061 BlockDriverState *bs; 2062 BdrvDirtyBitmap *bitmap; 2063 2064 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2065 if (!bitmap || !bs) { 2066 return; 2067 } 2068 2069 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2070 error_setg(errp, 2071 "Bitmap '%s' is currently frozen and cannot be removed", 2072 name); 2073 goto out; 2074 } 2075 bdrv_dirty_bitmap_make_anon(bitmap); 2076 bdrv_release_dirty_bitmap(bs, bitmap); 2077 2078 out: 2079 aio_context_release(aio_context); 2080 } 2081 2082 /** 2083 * Completely clear a bitmap, for the purposes of synchronizing a bitmap 2084 * immediately after a full backup operation. 2085 */ 2086 void qmp_block_dirty_bitmap_clear(const char *node, const char *name, 2087 Error **errp) 2088 { 2089 AioContext *aio_context; 2090 BdrvDirtyBitmap *bitmap; 2091 BlockDriverState *bs; 2092 2093 bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp); 2094 if (!bitmap || !bs) { 2095 return; 2096 } 2097 2098 if (bdrv_dirty_bitmap_frozen(bitmap)) { 2099 error_setg(errp, 2100 "Bitmap '%s' is currently frozen and cannot be modified", 2101 name); 2102 goto out; 2103 } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { 2104 error_setg(errp, 2105 "Bitmap '%s' is currently disabled and cannot be cleared", 2106 name); 2107 goto out; 2108 } 2109 2110 bdrv_clear_dirty_bitmap(bitmap); 2111 2112 out: 2113 aio_context_release(aio_context); 2114 } 2115 2116 void hmp_drive_del(Monitor *mon, const QDict *qdict) 2117 { 2118 const char *id = qdict_get_str(qdict, "id"); 2119 BlockBackend *blk; 2120 BlockDriverState *bs; 2121 AioContext *aio_context; 2122 Error *local_err = NULL; 2123 2124 blk = blk_by_name(id); 2125 if (!blk) { 2126 error_report("Device '%s' not found", id); 2127 return; 2128 } 2129 bs = blk_bs(blk); 2130 2131 if (!blk_legacy_dinfo(blk)) { 2132 error_report("Deleting device added with blockdev-add" 2133 " is not supported"); 2134 return; 2135 } 2136 2137 aio_context = bdrv_get_aio_context(bs); 2138 aio_context_acquire(aio_context); 2139 2140 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2141 error_report_err(local_err); 2142 aio_context_release(aio_context); 2143 return; 2144 } 2145 2146 /* quiesce block driver; prevent further io */ 2147 bdrv_drain_all(); 2148 bdrv_flush(bs); 2149 bdrv_close(bs); 2150 2151 /* if we have a device attached to this BlockDriverState 2152 * then we need to make the drive anonymous until the device 2153 * can be removed. If this is a drive with no device backing 2154 * then we can just get rid of the block driver state right here. 2155 */ 2156 if (blk_get_attached_dev(blk)) { 2157 blk_hide_on_behalf_of_hmp_drive_del(blk); 2158 /* Further I/O must not pause the guest */ 2159 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 2160 BLOCKDEV_ON_ERROR_REPORT); 2161 } else { 2162 blk_unref(blk); 2163 } 2164 2165 aio_context_release(aio_context); 2166 } 2167 2168 void qmp_block_resize(bool has_device, const char *device, 2169 bool has_node_name, const char *node_name, 2170 int64_t size, Error **errp) 2171 { 2172 Error *local_err = NULL; 2173 BlockDriverState *bs; 2174 AioContext *aio_context; 2175 int ret; 2176 2177 bs = bdrv_lookup_bs(has_device ? device : NULL, 2178 has_node_name ? node_name : NULL, 2179 &local_err); 2180 if (local_err) { 2181 error_propagate(errp, local_err); 2182 return; 2183 } 2184 2185 aio_context = bdrv_get_aio_context(bs); 2186 aio_context_acquire(aio_context); 2187 2188 if (!bdrv_is_first_non_filter(bs)) { 2189 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 2190 goto out; 2191 } 2192 2193 if (size < 0) { 2194 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2195 goto out; 2196 } 2197 2198 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2199 error_set(errp, QERR_DEVICE_IN_USE, device); 2200 goto out; 2201 } 2202 2203 /* complete all in-flight operations before resizing the device */ 2204 bdrv_drain_all(); 2205 2206 ret = bdrv_truncate(bs, size); 2207 switch (ret) { 2208 case 0: 2209 break; 2210 case -ENOMEDIUM: 2211 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2212 break; 2213 case -ENOTSUP: 2214 error_set(errp, QERR_UNSUPPORTED); 2215 break; 2216 case -EACCES: 2217 error_setg(errp, "Device '%s' is read only", device); 2218 break; 2219 case -EBUSY: 2220 error_set(errp, QERR_DEVICE_IN_USE, device); 2221 break; 2222 default: 2223 error_setg_errno(errp, -ret, "Could not resize"); 2224 break; 2225 } 2226 2227 out: 2228 aio_context_release(aio_context); 2229 } 2230 2231 static void block_job_cb(void *opaque, int ret) 2232 { 2233 /* Note that this function may be executed from another AioContext besides 2234 * the QEMU main loop. If you need to access anything that assumes the 2235 * QEMU global mutex, use a BH or introduce a mutex. 2236 */ 2237 2238 BlockDriverState *bs = opaque; 2239 const char *msg = NULL; 2240 2241 trace_block_job_cb(bs, bs->job, ret); 2242 2243 assert(bs->job); 2244 2245 if (ret < 0) { 2246 msg = strerror(-ret); 2247 } 2248 2249 if (block_job_is_cancelled(bs->job)) { 2250 block_job_event_cancelled(bs->job); 2251 } else { 2252 block_job_event_completed(bs->job, msg); 2253 } 2254 2255 bdrv_put_ref_bh_schedule(bs); 2256 } 2257 2258 void qmp_block_stream(const char *device, 2259 bool has_base, const char *base, 2260 bool has_backing_file, const char *backing_file, 2261 bool has_speed, int64_t speed, 2262 bool has_on_error, BlockdevOnError on_error, 2263 Error **errp) 2264 { 2265 BlockBackend *blk; 2266 BlockDriverState *bs; 2267 BlockDriverState *base_bs = NULL; 2268 AioContext *aio_context; 2269 Error *local_err = NULL; 2270 const char *base_name = NULL; 2271 2272 if (!has_on_error) { 2273 on_error = BLOCKDEV_ON_ERROR_REPORT; 2274 } 2275 2276 blk = blk_by_name(device); 2277 if (!blk) { 2278 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2279 return; 2280 } 2281 bs = blk_bs(blk); 2282 2283 aio_context = bdrv_get_aio_context(bs); 2284 aio_context_acquire(aio_context); 2285 2286 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2287 goto out; 2288 } 2289 2290 if (has_base) { 2291 base_bs = bdrv_find_backing_image(bs, base); 2292 if (base_bs == NULL) { 2293 error_set(errp, QERR_BASE_NOT_FOUND, base); 2294 goto out; 2295 } 2296 assert(bdrv_get_aio_context(base_bs) == aio_context); 2297 base_name = base; 2298 } 2299 2300 /* if we are streaming the entire chain, the result will have no backing 2301 * file, and specifying one is therefore an error */ 2302 if (base_bs == NULL && has_backing_file) { 2303 error_setg(errp, "backing file specified, but streaming the " 2304 "entire chain"); 2305 goto out; 2306 } 2307 2308 /* backing_file string overrides base bs filename */ 2309 base_name = has_backing_file ? backing_file : base_name; 2310 2311 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2312 on_error, block_job_cb, bs, &local_err); 2313 if (local_err) { 2314 error_propagate(errp, local_err); 2315 goto out; 2316 } 2317 2318 trace_qmp_block_stream(bs, bs->job); 2319 2320 out: 2321 aio_context_release(aio_context); 2322 } 2323 2324 void qmp_block_commit(const char *device, 2325 bool has_base, const char *base, 2326 bool has_top, const char *top, 2327 bool has_backing_file, const char *backing_file, 2328 bool has_speed, int64_t speed, 2329 Error **errp) 2330 { 2331 BlockBackend *blk; 2332 BlockDriverState *bs; 2333 BlockDriverState *base_bs, *top_bs; 2334 AioContext *aio_context; 2335 Error *local_err = NULL; 2336 /* This will be part of the QMP command, if/when the 2337 * BlockdevOnError change for blkmirror makes it in 2338 */ 2339 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2340 2341 if (!has_speed) { 2342 speed = 0; 2343 } 2344 2345 /* Important Note: 2346 * libvirt relies on the DeviceNotFound error class in order to probe for 2347 * live commit feature versions; for this to work, we must make sure to 2348 * perform the device lookup before any generic errors that may occur in a 2349 * scenario in which all optional arguments are omitted. */ 2350 blk = blk_by_name(device); 2351 if (!blk) { 2352 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2353 return; 2354 } 2355 bs = blk_bs(blk); 2356 2357 aio_context = bdrv_get_aio_context(bs); 2358 aio_context_acquire(aio_context); 2359 2360 /* drain all i/o before commits */ 2361 bdrv_drain_all(); 2362 2363 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2364 goto out; 2365 } 2366 2367 /* default top_bs is the active layer */ 2368 top_bs = bs; 2369 2370 if (has_top && top) { 2371 if (strcmp(bs->filename, top) != 0) { 2372 top_bs = bdrv_find_backing_image(bs, top); 2373 } 2374 } 2375 2376 if (top_bs == NULL) { 2377 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2378 goto out; 2379 } 2380 2381 assert(bdrv_get_aio_context(top_bs) == aio_context); 2382 2383 if (has_base && base) { 2384 base_bs = bdrv_find_backing_image(top_bs, base); 2385 } else { 2386 base_bs = bdrv_find_base(top_bs); 2387 } 2388 2389 if (base_bs == NULL) { 2390 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2391 goto out; 2392 } 2393 2394 assert(bdrv_get_aio_context(base_bs) == aio_context); 2395 2396 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2397 goto out; 2398 } 2399 2400 /* Do not allow attempts to commit an image into itself */ 2401 if (top_bs == base_bs) { 2402 error_setg(errp, "cannot commit an image into itself"); 2403 goto out; 2404 } 2405 2406 if (top_bs == bs) { 2407 if (has_backing_file) { 2408 error_setg(errp, "'backing-file' specified," 2409 " but 'top' is the active layer"); 2410 goto out; 2411 } 2412 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2413 bs, &local_err); 2414 } else { 2415 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2416 has_backing_file ? backing_file : NULL, &local_err); 2417 } 2418 if (local_err != NULL) { 2419 error_propagate(errp, local_err); 2420 goto out; 2421 } 2422 2423 out: 2424 aio_context_release(aio_context); 2425 } 2426 2427 void qmp_drive_backup(const char *device, const char *target, 2428 bool has_format, const char *format, 2429 enum MirrorSyncMode sync, 2430 bool has_mode, enum NewImageMode mode, 2431 bool has_speed, int64_t speed, 2432 bool has_bitmap, const char *bitmap, 2433 bool has_on_source_error, BlockdevOnError on_source_error, 2434 bool has_on_target_error, BlockdevOnError on_target_error, 2435 Error **errp) 2436 { 2437 BlockBackend *blk; 2438 BlockDriverState *bs; 2439 BlockDriverState *target_bs; 2440 BlockDriverState *source = NULL; 2441 BdrvDirtyBitmap *bmap = NULL; 2442 AioContext *aio_context; 2443 BlockDriver *drv = NULL; 2444 Error *local_err = NULL; 2445 int flags; 2446 int64_t size; 2447 int ret; 2448 2449 if (!has_speed) { 2450 speed = 0; 2451 } 2452 if (!has_on_source_error) { 2453 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2454 } 2455 if (!has_on_target_error) { 2456 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2457 } 2458 if (!has_mode) { 2459 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2460 } 2461 2462 blk = blk_by_name(device); 2463 if (!blk) { 2464 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2465 return; 2466 } 2467 bs = blk_bs(blk); 2468 2469 aio_context = bdrv_get_aio_context(bs); 2470 aio_context_acquire(aio_context); 2471 2472 /* Although backup_run has this check too, we need to use bs->drv below, so 2473 * do an early check redundantly. */ 2474 if (!bdrv_is_inserted(bs)) { 2475 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2476 goto out; 2477 } 2478 2479 if (!has_format) { 2480 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2481 } 2482 if (format) { 2483 drv = bdrv_find_format(format); 2484 if (!drv) { 2485 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2486 goto out; 2487 } 2488 } 2489 2490 /* Early check to avoid creating target */ 2491 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2492 goto out; 2493 } 2494 2495 flags = bs->open_flags | BDRV_O_RDWR; 2496 2497 /* See if we have a backing HD we can use to create our new image 2498 * on top of. */ 2499 if (sync == MIRROR_SYNC_MODE_TOP) { 2500 source = bs->backing_hd; 2501 if (!source) { 2502 sync = MIRROR_SYNC_MODE_FULL; 2503 } 2504 } 2505 if (sync == MIRROR_SYNC_MODE_NONE) { 2506 source = bs; 2507 } 2508 2509 size = bdrv_getlength(bs); 2510 if (size < 0) { 2511 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2512 goto out; 2513 } 2514 2515 if (mode != NEW_IMAGE_MODE_EXISTING) { 2516 assert(format && drv); 2517 if (source) { 2518 bdrv_img_create(target, format, source->filename, 2519 source->drv->format_name, NULL, 2520 size, flags, &local_err, false); 2521 } else { 2522 bdrv_img_create(target, format, NULL, NULL, NULL, 2523 size, flags, &local_err, false); 2524 } 2525 } 2526 2527 if (local_err) { 2528 error_propagate(errp, local_err); 2529 goto out; 2530 } 2531 2532 target_bs = NULL; 2533 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2534 if (ret < 0) { 2535 error_propagate(errp, local_err); 2536 goto out; 2537 } 2538 2539 bdrv_set_aio_context(target_bs, aio_context); 2540 2541 if (has_bitmap) { 2542 bmap = bdrv_find_dirty_bitmap(bs, bitmap); 2543 if (!bmap) { 2544 error_setg(errp, "Bitmap '%s' could not be found", bitmap); 2545 goto out; 2546 } 2547 } 2548 2549 backup_start(bs, target_bs, speed, sync, bmap, 2550 on_source_error, on_target_error, 2551 block_job_cb, bs, &local_err); 2552 if (local_err != NULL) { 2553 bdrv_unref(target_bs); 2554 error_propagate(errp, local_err); 2555 goto out; 2556 } 2557 2558 out: 2559 aio_context_release(aio_context); 2560 } 2561 2562 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2563 { 2564 return bdrv_named_nodes_list(errp); 2565 } 2566 2567 void qmp_blockdev_backup(const char *device, const char *target, 2568 enum MirrorSyncMode sync, 2569 bool has_speed, int64_t speed, 2570 bool has_on_source_error, 2571 BlockdevOnError on_source_error, 2572 bool has_on_target_error, 2573 BlockdevOnError on_target_error, 2574 Error **errp) 2575 { 2576 BlockBackend *blk; 2577 BlockDriverState *bs; 2578 BlockDriverState *target_bs; 2579 Error *local_err = NULL; 2580 AioContext *aio_context; 2581 2582 if (!has_speed) { 2583 speed = 0; 2584 } 2585 if (!has_on_source_error) { 2586 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2587 } 2588 if (!has_on_target_error) { 2589 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2590 } 2591 2592 blk = blk_by_name(device); 2593 if (!blk) { 2594 error_setg(errp, "Device '%s' not found", device); 2595 return; 2596 } 2597 bs = blk_bs(blk); 2598 2599 aio_context = bdrv_get_aio_context(bs); 2600 aio_context_acquire(aio_context); 2601 2602 blk = blk_by_name(target); 2603 if (!blk) { 2604 error_setg(errp, "Device '%s' not found", target); 2605 goto out; 2606 } 2607 target_bs = blk_bs(blk); 2608 2609 bdrv_ref(target_bs); 2610 bdrv_set_aio_context(target_bs, aio_context); 2611 backup_start(bs, target_bs, speed, sync, NULL, on_source_error, 2612 on_target_error, block_job_cb, bs, &local_err); 2613 if (local_err != NULL) { 2614 bdrv_unref(target_bs); 2615 error_propagate(errp, local_err); 2616 } 2617 out: 2618 aio_context_release(aio_context); 2619 } 2620 2621 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2622 2623 void qmp_drive_mirror(const char *device, const char *target, 2624 bool has_format, const char *format, 2625 bool has_node_name, const char *node_name, 2626 bool has_replaces, const char *replaces, 2627 enum MirrorSyncMode sync, 2628 bool has_mode, enum NewImageMode mode, 2629 bool has_speed, int64_t speed, 2630 bool has_granularity, uint32_t granularity, 2631 bool has_buf_size, int64_t buf_size, 2632 bool has_on_source_error, BlockdevOnError on_source_error, 2633 bool has_on_target_error, BlockdevOnError on_target_error, 2634 Error **errp) 2635 { 2636 BlockBackend *blk; 2637 BlockDriverState *bs; 2638 BlockDriverState *source, *target_bs; 2639 AioContext *aio_context; 2640 BlockDriver *drv = NULL; 2641 Error *local_err = NULL; 2642 QDict *options = NULL; 2643 int flags; 2644 int64_t size; 2645 int ret; 2646 2647 if (!has_speed) { 2648 speed = 0; 2649 } 2650 if (!has_on_source_error) { 2651 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2652 } 2653 if (!has_on_target_error) { 2654 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2655 } 2656 if (!has_mode) { 2657 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2658 } 2659 if (!has_granularity) { 2660 granularity = 0; 2661 } 2662 if (!has_buf_size) { 2663 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2664 } 2665 2666 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2667 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2668 "a value in range [512B, 64MB]"); 2669 return; 2670 } 2671 if (granularity & (granularity - 1)) { 2672 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2"); 2673 return; 2674 } 2675 2676 blk = blk_by_name(device); 2677 if (!blk) { 2678 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2679 return; 2680 } 2681 bs = blk_bs(blk); 2682 2683 aio_context = bdrv_get_aio_context(bs); 2684 aio_context_acquire(aio_context); 2685 2686 if (!bdrv_is_inserted(bs)) { 2687 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2688 goto out; 2689 } 2690 2691 if (!has_format) { 2692 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2693 } 2694 if (format) { 2695 drv = bdrv_find_format(format); 2696 if (!drv) { 2697 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2698 goto out; 2699 } 2700 } 2701 2702 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2703 goto out; 2704 } 2705 2706 flags = bs->open_flags | BDRV_O_RDWR; 2707 source = bs->backing_hd; 2708 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2709 sync = MIRROR_SYNC_MODE_FULL; 2710 } 2711 if (sync == MIRROR_SYNC_MODE_NONE) { 2712 source = bs; 2713 } 2714 2715 size = bdrv_getlength(bs); 2716 if (size < 0) { 2717 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2718 goto out; 2719 } 2720 2721 if (has_replaces) { 2722 BlockDriverState *to_replace_bs; 2723 AioContext *replace_aio_context; 2724 int64_t replace_size; 2725 2726 if (!has_node_name) { 2727 error_setg(errp, "a node-name must be provided when replacing a" 2728 " named node of the graph"); 2729 goto out; 2730 } 2731 2732 to_replace_bs = check_to_replace_node(replaces, &local_err); 2733 2734 if (!to_replace_bs) { 2735 error_propagate(errp, local_err); 2736 goto out; 2737 } 2738 2739 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2740 aio_context_acquire(replace_aio_context); 2741 replace_size = bdrv_getlength(to_replace_bs); 2742 aio_context_release(replace_aio_context); 2743 2744 if (size != replace_size) { 2745 error_setg(errp, "cannot replace image with a mirror image of " 2746 "different size"); 2747 goto out; 2748 } 2749 } 2750 2751 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2752 && mode != NEW_IMAGE_MODE_EXISTING) 2753 { 2754 /* create new image w/o backing file */ 2755 assert(format && drv); 2756 bdrv_img_create(target, format, 2757 NULL, NULL, NULL, size, flags, &local_err, false); 2758 } else { 2759 switch (mode) { 2760 case NEW_IMAGE_MODE_EXISTING: 2761 break; 2762 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2763 /* create new image with backing file */ 2764 bdrv_img_create(target, format, 2765 source->filename, 2766 source->drv->format_name, 2767 NULL, size, flags, &local_err, false); 2768 break; 2769 default: 2770 abort(); 2771 } 2772 } 2773 2774 if (local_err) { 2775 error_propagate(errp, local_err); 2776 goto out; 2777 } 2778 2779 if (has_node_name) { 2780 options = qdict_new(); 2781 qdict_put(options, "node-name", qstring_from_str(node_name)); 2782 } 2783 2784 /* Mirroring takes care of copy-on-write using the source's backing 2785 * file. 2786 */ 2787 target_bs = NULL; 2788 ret = bdrv_open(&target_bs, target, NULL, options, 2789 flags | BDRV_O_NO_BACKING, drv, &local_err); 2790 if (ret < 0) { 2791 error_propagate(errp, local_err); 2792 goto out; 2793 } 2794 2795 bdrv_set_aio_context(target_bs, aio_context); 2796 2797 /* pass the node name to replace to mirror start since it's loose coupling 2798 * and will allow to check whether the node still exist at mirror completion 2799 */ 2800 mirror_start(bs, target_bs, 2801 has_replaces ? replaces : NULL, 2802 speed, granularity, buf_size, sync, 2803 on_source_error, on_target_error, 2804 block_job_cb, bs, &local_err); 2805 if (local_err != NULL) { 2806 bdrv_unref(target_bs); 2807 error_propagate(errp, local_err); 2808 goto out; 2809 } 2810 2811 out: 2812 aio_context_release(aio_context); 2813 } 2814 2815 /* Get the block job for a given device name and acquire its AioContext */ 2816 static BlockJob *find_block_job(const char *device, AioContext **aio_context, 2817 Error **errp) 2818 { 2819 BlockBackend *blk; 2820 BlockDriverState *bs; 2821 2822 blk = blk_by_name(device); 2823 if (!blk) { 2824 goto notfound; 2825 } 2826 bs = blk_bs(blk); 2827 2828 *aio_context = bdrv_get_aio_context(bs); 2829 aio_context_acquire(*aio_context); 2830 2831 if (!bs->job) { 2832 aio_context_release(*aio_context); 2833 goto notfound; 2834 } 2835 2836 return bs->job; 2837 2838 notfound: 2839 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, 2840 "No active block job on device '%s'", device); 2841 *aio_context = NULL; 2842 return NULL; 2843 } 2844 2845 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2846 { 2847 AioContext *aio_context; 2848 BlockJob *job = find_block_job(device, &aio_context, errp); 2849 2850 if (!job) { 2851 return; 2852 } 2853 2854 block_job_set_speed(job, speed, errp); 2855 aio_context_release(aio_context); 2856 } 2857 2858 void qmp_block_job_cancel(const char *device, 2859 bool has_force, bool force, Error **errp) 2860 { 2861 AioContext *aio_context; 2862 BlockJob *job = find_block_job(device, &aio_context, errp); 2863 2864 if (!job) { 2865 return; 2866 } 2867 2868 if (!has_force) { 2869 force = false; 2870 } 2871 2872 if (job->user_paused && !force) { 2873 error_setg(errp, "The block job for device '%s' is currently paused", 2874 device); 2875 goto out; 2876 } 2877 2878 trace_qmp_block_job_cancel(job); 2879 block_job_cancel(job); 2880 out: 2881 aio_context_release(aio_context); 2882 } 2883 2884 void qmp_block_job_pause(const char *device, Error **errp) 2885 { 2886 AioContext *aio_context; 2887 BlockJob *job = find_block_job(device, &aio_context, errp); 2888 2889 if (!job || job->user_paused) { 2890 return; 2891 } 2892 2893 job->user_paused = true; 2894 trace_qmp_block_job_pause(job); 2895 block_job_pause(job); 2896 aio_context_release(aio_context); 2897 } 2898 2899 void qmp_block_job_resume(const char *device, Error **errp) 2900 { 2901 AioContext *aio_context; 2902 BlockJob *job = find_block_job(device, &aio_context, errp); 2903 2904 if (!job || !job->user_paused) { 2905 return; 2906 } 2907 2908 job->user_paused = false; 2909 trace_qmp_block_job_resume(job); 2910 block_job_resume(job); 2911 aio_context_release(aio_context); 2912 } 2913 2914 void qmp_block_job_complete(const char *device, Error **errp) 2915 { 2916 AioContext *aio_context; 2917 BlockJob *job = find_block_job(device, &aio_context, errp); 2918 2919 if (!job) { 2920 return; 2921 } 2922 2923 trace_qmp_block_job_complete(job); 2924 block_job_complete(job, errp); 2925 aio_context_release(aio_context); 2926 } 2927 2928 void qmp_change_backing_file(const char *device, 2929 const char *image_node_name, 2930 const char *backing_file, 2931 Error **errp) 2932 { 2933 BlockBackend *blk; 2934 BlockDriverState *bs = NULL; 2935 AioContext *aio_context; 2936 BlockDriverState *image_bs = NULL; 2937 Error *local_err = NULL; 2938 bool ro; 2939 int open_flags; 2940 int ret; 2941 2942 blk = blk_by_name(device); 2943 if (!blk) { 2944 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2945 return; 2946 } 2947 bs = blk_bs(blk); 2948 2949 aio_context = bdrv_get_aio_context(bs); 2950 aio_context_acquire(aio_context); 2951 2952 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2953 if (local_err) { 2954 error_propagate(errp, local_err); 2955 goto out; 2956 } 2957 2958 if (!image_bs) { 2959 error_setg(errp, "image file not found"); 2960 goto out; 2961 } 2962 2963 if (bdrv_find_base(image_bs) == image_bs) { 2964 error_setg(errp, "not allowing backing file change on an image " 2965 "without a backing file"); 2966 goto out; 2967 } 2968 2969 /* even though we are not necessarily operating on bs, we need it to 2970 * determine if block ops are currently prohibited on the chain */ 2971 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 2972 goto out; 2973 } 2974 2975 /* final sanity check */ 2976 if (!bdrv_chain_contains(bs, image_bs)) { 2977 error_setg(errp, "'%s' and image file are not in the same chain", 2978 device); 2979 goto out; 2980 } 2981 2982 /* if not r/w, reopen to make r/w */ 2983 open_flags = image_bs->open_flags; 2984 ro = bdrv_is_read_only(image_bs); 2985 2986 if (ro) { 2987 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 2988 if (local_err) { 2989 error_propagate(errp, local_err); 2990 goto out; 2991 } 2992 } 2993 2994 ret = bdrv_change_backing_file(image_bs, backing_file, 2995 image_bs->drv ? image_bs->drv->format_name : ""); 2996 2997 if (ret < 0) { 2998 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 2999 backing_file); 3000 /* don't exit here, so we can try to restore open flags if 3001 * appropriate */ 3002 } 3003 3004 if (ro) { 3005 bdrv_reopen(image_bs, open_flags, &local_err); 3006 if (local_err) { 3007 error_propagate(errp, local_err); /* will preserve prior errp */ 3008 } 3009 } 3010 3011 out: 3012 aio_context_release(aio_context); 3013 } 3014 3015 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 3016 { 3017 QmpOutputVisitor *ov = qmp_output_visitor_new(); 3018 BlockBackend *blk; 3019 QObject *obj; 3020 QDict *qdict; 3021 Error *local_err = NULL; 3022 3023 /* Require an ID in the top level */ 3024 if (!options->has_id) { 3025 error_setg(errp, "Block device needs an ID"); 3026 goto fail; 3027 } 3028 3029 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 3030 * cache.direct=false instead of silently switching to aio=threads, except 3031 * when called from drive_new(). 3032 * 3033 * For now, simply forbidding the combination for all drivers will do. */ 3034 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 3035 bool direct = options->has_cache && 3036 options->cache->has_direct && 3037 options->cache->direct; 3038 if (!direct) { 3039 error_setg(errp, "aio=native requires cache.direct=true"); 3040 goto fail; 3041 } 3042 } 3043 3044 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 3045 &options, NULL, &local_err); 3046 if (local_err) { 3047 error_propagate(errp, local_err); 3048 goto fail; 3049 } 3050 3051 obj = qmp_output_get_qobject(ov); 3052 qdict = qobject_to_qdict(obj); 3053 3054 qdict_flatten(qdict); 3055 3056 blk = blockdev_init(NULL, qdict, &local_err); 3057 if (local_err) { 3058 error_propagate(errp, local_err); 3059 goto fail; 3060 } 3061 3062 if (bdrv_key_required(blk_bs(blk))) { 3063 blk_unref(blk); 3064 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 3065 goto fail; 3066 } 3067 3068 fail: 3069 qmp_output_visitor_cleanup(ov); 3070 } 3071 3072 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 3073 { 3074 BlockJobInfoList *head = NULL, **p_next = &head; 3075 BlockDriverState *bs; 3076 3077 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 3078 AioContext *aio_context = bdrv_get_aio_context(bs); 3079 3080 aio_context_acquire(aio_context); 3081 3082 if (bs->job) { 3083 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 3084 elem->value = block_job_query(bs->job); 3085 *p_next = elem; 3086 p_next = &elem->next; 3087 } 3088 3089 aio_context_release(aio_context); 3090 } 3091 3092 return head; 3093 } 3094 3095 QemuOptsList qemu_common_drive_opts = { 3096 .name = "drive", 3097 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 3098 .desc = { 3099 { 3100 .name = "snapshot", 3101 .type = QEMU_OPT_BOOL, 3102 .help = "enable/disable snapshot mode", 3103 },{ 3104 .name = "discard", 3105 .type = QEMU_OPT_STRING, 3106 .help = "discard operation (ignore/off, unmap/on)", 3107 },{ 3108 .name = "cache.writeback", 3109 .type = QEMU_OPT_BOOL, 3110 .help = "enables writeback mode for any caches", 3111 },{ 3112 .name = "cache.direct", 3113 .type = QEMU_OPT_BOOL, 3114 .help = "enables use of O_DIRECT (bypass the host page cache)", 3115 },{ 3116 .name = "cache.no-flush", 3117 .type = QEMU_OPT_BOOL, 3118 .help = "ignore any flush requests for the device", 3119 },{ 3120 .name = "aio", 3121 .type = QEMU_OPT_STRING, 3122 .help = "host AIO implementation (threads, native)", 3123 },{ 3124 .name = "format", 3125 .type = QEMU_OPT_STRING, 3126 .help = "disk format (raw, qcow2, ...)", 3127 },{ 3128 .name = "rerror", 3129 .type = QEMU_OPT_STRING, 3130 .help = "read error action", 3131 },{ 3132 .name = "werror", 3133 .type = QEMU_OPT_STRING, 3134 .help = "write error action", 3135 },{ 3136 .name = "read-only", 3137 .type = QEMU_OPT_BOOL, 3138 .help = "open drive file as read-only", 3139 },{ 3140 .name = "throttling.iops-total", 3141 .type = QEMU_OPT_NUMBER, 3142 .help = "limit total I/O operations per second", 3143 },{ 3144 .name = "throttling.iops-read", 3145 .type = QEMU_OPT_NUMBER, 3146 .help = "limit read operations per second", 3147 },{ 3148 .name = "throttling.iops-write", 3149 .type = QEMU_OPT_NUMBER, 3150 .help = "limit write operations per second", 3151 },{ 3152 .name = "throttling.bps-total", 3153 .type = QEMU_OPT_NUMBER, 3154 .help = "limit total bytes per second", 3155 },{ 3156 .name = "throttling.bps-read", 3157 .type = QEMU_OPT_NUMBER, 3158 .help = "limit read bytes per second", 3159 },{ 3160 .name = "throttling.bps-write", 3161 .type = QEMU_OPT_NUMBER, 3162 .help = "limit write bytes per second", 3163 },{ 3164 .name = "throttling.iops-total-max", 3165 .type = QEMU_OPT_NUMBER, 3166 .help = "I/O operations burst", 3167 },{ 3168 .name = "throttling.iops-read-max", 3169 .type = QEMU_OPT_NUMBER, 3170 .help = "I/O operations read burst", 3171 },{ 3172 .name = "throttling.iops-write-max", 3173 .type = QEMU_OPT_NUMBER, 3174 .help = "I/O operations write burst", 3175 },{ 3176 .name = "throttling.bps-total-max", 3177 .type = QEMU_OPT_NUMBER, 3178 .help = "total bytes burst", 3179 },{ 3180 .name = "throttling.bps-read-max", 3181 .type = QEMU_OPT_NUMBER, 3182 .help = "total bytes read burst", 3183 },{ 3184 .name = "throttling.bps-write-max", 3185 .type = QEMU_OPT_NUMBER, 3186 .help = "total bytes write burst", 3187 },{ 3188 .name = "throttling.iops-size", 3189 .type = QEMU_OPT_NUMBER, 3190 .help = "when limiting by iops max size of an I/O in bytes", 3191 },{ 3192 .name = "copy-on-read", 3193 .type = QEMU_OPT_BOOL, 3194 .help = "copy read data from backing file into image file", 3195 },{ 3196 .name = "detect-zeroes", 3197 .type = QEMU_OPT_STRING, 3198 .help = "try to optimize zero writes (off, on, unmap)", 3199 }, 3200 { /* end of list */ } 3201 }, 3202 }; 3203 3204 QemuOptsList qemu_drive_opts = { 3205 .name = "drive", 3206 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3207 .desc = { 3208 /* 3209 * no elements => accept any params 3210 * validation will happen later 3211 */ 3212 { /* end of list */ } 3213 }, 3214 }; 3215