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 char buf[32]; 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]); 191 } 192 if (index >= 0) { 193 snprintf(buf, sizeof(buf), "%d", index); 194 qemu_opt_set(opts, "index", buf); 195 } 196 if (file) 197 qemu_opt_set(opts, "file", file); 198 return opts; 199 } 200 201 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 202 { 203 BlockBackend *blk; 204 DriveInfo *dinfo; 205 206 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 207 dinfo = blk_legacy_dinfo(blk); 208 if (dinfo && dinfo->type == type 209 && dinfo->bus == bus && dinfo->unit == unit) { 210 return dinfo; 211 } 212 } 213 214 return NULL; 215 } 216 217 bool drive_check_orphaned(void) 218 { 219 BlockBackend *blk; 220 DriveInfo *dinfo; 221 bool rs = false; 222 223 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 224 dinfo = blk_legacy_dinfo(blk); 225 /* If dinfo->bdrv->dev is NULL, it has no device attached. */ 226 /* Unless this is a default drive, this may be an oversight. */ 227 if (!blk_get_attached_dev(blk) && !dinfo->is_default && 228 dinfo->type != IF_NONE) { 229 fprintf(stderr, "Warning: Orphaned drive without device: " 230 "id=%s,file=%s,if=%s,bus=%d,unit=%d\n", 231 blk_name(blk), blk_bs(blk)->filename, if_name[dinfo->type], 232 dinfo->bus, dinfo->unit); 233 rs = true; 234 } 235 } 236 237 return rs; 238 } 239 240 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 241 { 242 return drive_get(type, 243 drive_index_to_bus_id(type, index), 244 drive_index_to_unit_id(type, index)); 245 } 246 247 int drive_get_max_bus(BlockInterfaceType type) 248 { 249 int max_bus; 250 BlockBackend *blk; 251 DriveInfo *dinfo; 252 253 max_bus = -1; 254 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) { 255 dinfo = blk_legacy_dinfo(blk); 256 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) { 257 max_bus = dinfo->bus; 258 } 259 } 260 return max_bus; 261 } 262 263 /* Get a block device. This should only be used for single-drive devices 264 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 265 appropriate bus. */ 266 DriveInfo *drive_get_next(BlockInterfaceType type) 267 { 268 static int next_block_unit[IF_COUNT]; 269 270 return drive_get(type, 0, next_block_unit[type]++); 271 } 272 273 static void bdrv_format_print(void *opaque, const char *name) 274 { 275 error_printf(" %s", name); 276 } 277 278 typedef struct { 279 QEMUBH *bh; 280 BlockDriverState *bs; 281 } BDRVPutRefBH; 282 283 static void bdrv_put_ref_bh(void *opaque) 284 { 285 BDRVPutRefBH *s = opaque; 286 287 bdrv_unref(s->bs); 288 qemu_bh_delete(s->bh); 289 g_free(s); 290 } 291 292 /* 293 * Release a BDS reference in a BH 294 * 295 * It is not safe to use bdrv_unref() from a callback function when the callers 296 * still need the BlockDriverState. In such cases we schedule a BH to release 297 * the reference. 298 */ 299 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 300 { 301 BDRVPutRefBH *s; 302 303 s = g_new(BDRVPutRefBH, 1); 304 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 305 s->bs = bs; 306 qemu_bh_schedule(s->bh); 307 } 308 309 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 310 { 311 if (!strcmp(buf, "ignore")) { 312 return BLOCKDEV_ON_ERROR_IGNORE; 313 } else if (!is_read && !strcmp(buf, "enospc")) { 314 return BLOCKDEV_ON_ERROR_ENOSPC; 315 } else if (!strcmp(buf, "stop")) { 316 return BLOCKDEV_ON_ERROR_STOP; 317 } else if (!strcmp(buf, "report")) { 318 return BLOCKDEV_ON_ERROR_REPORT; 319 } else { 320 error_setg(errp, "'%s' invalid %s error action", 321 buf, is_read ? "read" : "write"); 322 return -1; 323 } 324 } 325 326 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 327 { 328 if (throttle_conflicting(cfg)) { 329 error_setg(errp, "bps/iops/max total values and read/write values" 330 " cannot be used at the same time"); 331 return false; 332 } 333 334 if (!throttle_is_valid(cfg)) { 335 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 336 return false; 337 } 338 339 return true; 340 } 341 342 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 343 344 /* Takes the ownership of bs_opts */ 345 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts, 346 Error **errp) 347 { 348 const char *buf; 349 int ro = 0; 350 int bdrv_flags = 0; 351 int on_read_error, on_write_error; 352 BlockBackend *blk; 353 BlockDriverState *bs; 354 ThrottleConfig cfg; 355 int snapshot = 0; 356 bool copy_on_read; 357 int ret; 358 Error *error = NULL; 359 QemuOpts *opts; 360 const char *id; 361 bool has_driver_specific_opts; 362 BlockdevDetectZeroesOptions detect_zeroes; 363 BlockDriver *drv = NULL; 364 365 /* Check common options by copying from bs_opts to opts, all other options 366 * stay in bs_opts for processing by bdrv_open(). */ 367 id = qdict_get_try_str(bs_opts, "id"); 368 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 369 if (error) { 370 error_propagate(errp, error); 371 goto err_no_opts; 372 } 373 374 qemu_opts_absorb_qdict(opts, bs_opts, &error); 375 if (error) { 376 error_propagate(errp, error); 377 goto early_err; 378 } 379 380 if (id) { 381 qdict_del(bs_opts, "id"); 382 } 383 384 has_driver_specific_opts = !!qdict_size(bs_opts); 385 386 /* extract parameters */ 387 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 388 ro = qemu_opt_get_bool(opts, "read-only", 0); 389 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 390 391 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 392 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 393 error_setg(errp, "invalid discard option"); 394 goto early_err; 395 } 396 } 397 398 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 399 bdrv_flags |= BDRV_O_CACHE_WB; 400 } 401 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 402 bdrv_flags |= BDRV_O_NOCACHE; 403 } 404 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 405 bdrv_flags |= BDRV_O_NO_FLUSH; 406 } 407 408 #ifdef CONFIG_LINUX_AIO 409 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 410 if (!strcmp(buf, "native")) { 411 bdrv_flags |= BDRV_O_NATIVE_AIO; 412 } else if (!strcmp(buf, "threads")) { 413 /* this is the default */ 414 } else { 415 error_setg(errp, "invalid aio option"); 416 goto early_err; 417 } 418 } 419 #endif 420 421 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 422 if (is_help_option(buf)) { 423 error_printf("Supported formats:"); 424 bdrv_iterate_format(bdrv_format_print, NULL); 425 error_printf("\n"); 426 goto early_err; 427 } 428 429 drv = bdrv_find_format(buf); 430 if (!drv) { 431 error_setg(errp, "'%s' invalid format", buf); 432 goto early_err; 433 } 434 } 435 436 /* disk I/O throttling */ 437 memset(&cfg, 0, sizeof(cfg)); 438 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 439 qemu_opt_get_number(opts, "throttling.bps-total", 0); 440 cfg.buckets[THROTTLE_BPS_READ].avg = 441 qemu_opt_get_number(opts, "throttling.bps-read", 0); 442 cfg.buckets[THROTTLE_BPS_WRITE].avg = 443 qemu_opt_get_number(opts, "throttling.bps-write", 0); 444 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 445 qemu_opt_get_number(opts, "throttling.iops-total", 0); 446 cfg.buckets[THROTTLE_OPS_READ].avg = 447 qemu_opt_get_number(opts, "throttling.iops-read", 0); 448 cfg.buckets[THROTTLE_OPS_WRITE].avg = 449 qemu_opt_get_number(opts, "throttling.iops-write", 0); 450 451 cfg.buckets[THROTTLE_BPS_TOTAL].max = 452 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 453 cfg.buckets[THROTTLE_BPS_READ].max = 454 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 455 cfg.buckets[THROTTLE_BPS_WRITE].max = 456 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 457 cfg.buckets[THROTTLE_OPS_TOTAL].max = 458 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 459 cfg.buckets[THROTTLE_OPS_READ].max = 460 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 461 cfg.buckets[THROTTLE_OPS_WRITE].max = 462 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 463 464 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 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 blk = blk_new_with_bs(qemu_opts_id(opts), errp); 509 if (!blk) { 510 goto early_err; 511 } 512 bs = blk_bs(blk); 513 bs->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 514 bs->read_only = ro; 515 bs->detect_zeroes = detect_zeroes; 516 517 bdrv_set_on_error(bs, on_read_error, on_write_error); 518 519 /* disk I/O throttling */ 520 if (throttle_enabled(&cfg)) { 521 bdrv_io_limits_enable(bs); 522 bdrv_set_io_limits(bs, &cfg); 523 } 524 525 if (!file || !*file) { 526 if (has_driver_specific_opts) { 527 file = NULL; 528 } else { 529 QDECREF(bs_opts); 530 qemu_opts_del(opts); 531 return blk; 532 } 533 } 534 if (snapshot) { 535 /* always use cache=unsafe with snapshot */ 536 bdrv_flags &= ~BDRV_O_CACHE_MASK; 537 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 538 } 539 540 if (copy_on_read) { 541 bdrv_flags |= BDRV_O_COPY_ON_READ; 542 } 543 544 if (runstate_check(RUN_STATE_INMIGRATE)) { 545 bdrv_flags |= BDRV_O_INCOMING; 546 } 547 548 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 549 550 QINCREF(bs_opts); 551 ret = bdrv_open(&bs, file, NULL, bs_opts, bdrv_flags, drv, &error); 552 assert(bs == blk_bs(blk)); 553 554 if (ret < 0) { 555 error_setg(errp, "could not open disk image %s: %s", 556 file ?: blk_name(blk), error_get_pretty(error)); 557 error_free(error); 558 goto err; 559 } 560 561 if (bdrv_key_required(bs)) { 562 autostart = 0; 563 } 564 565 QDECREF(bs_opts); 566 qemu_opts_del(opts); 567 568 return blk; 569 570 err: 571 blk_unref(blk); 572 early_err: 573 qemu_opts_del(opts); 574 err_no_opts: 575 QDECREF(bs_opts); 576 return NULL; 577 } 578 579 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to, 580 Error **errp) 581 { 582 const char *value; 583 584 value = qemu_opt_get(opts, from); 585 if (value) { 586 if (qemu_opt_find(opts, to)) { 587 error_setg(errp, "'%s' and its alias '%s' can't be used at the " 588 "same time", to, from); 589 return; 590 } 591 } 592 593 /* rename all items in opts */ 594 while ((value = qemu_opt_get(opts, from))) { 595 qemu_opt_set(opts, to, value); 596 qemu_opt_unset(opts, from); 597 } 598 } 599 600 QemuOptsList qemu_legacy_drive_opts = { 601 .name = "drive", 602 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 603 .desc = { 604 { 605 .name = "bus", 606 .type = QEMU_OPT_NUMBER, 607 .help = "bus number", 608 },{ 609 .name = "unit", 610 .type = QEMU_OPT_NUMBER, 611 .help = "unit number (i.e. lun for scsi)", 612 },{ 613 .name = "index", 614 .type = QEMU_OPT_NUMBER, 615 .help = "index number", 616 },{ 617 .name = "media", 618 .type = QEMU_OPT_STRING, 619 .help = "media type (disk, cdrom)", 620 },{ 621 .name = "if", 622 .type = QEMU_OPT_STRING, 623 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 624 },{ 625 .name = "cyls", 626 .type = QEMU_OPT_NUMBER, 627 .help = "number of cylinders (ide disk geometry)", 628 },{ 629 .name = "heads", 630 .type = QEMU_OPT_NUMBER, 631 .help = "number of heads (ide disk geometry)", 632 },{ 633 .name = "secs", 634 .type = QEMU_OPT_NUMBER, 635 .help = "number of sectors (ide disk geometry)", 636 },{ 637 .name = "trans", 638 .type = QEMU_OPT_STRING, 639 .help = "chs translation (auto, lba, none)", 640 },{ 641 .name = "boot", 642 .type = QEMU_OPT_BOOL, 643 .help = "(deprecated, ignored)", 644 },{ 645 .name = "addr", 646 .type = QEMU_OPT_STRING, 647 .help = "pci address (virtio only)", 648 },{ 649 .name = "serial", 650 .type = QEMU_OPT_STRING, 651 .help = "disk serial number", 652 },{ 653 .name = "file", 654 .type = QEMU_OPT_STRING, 655 .help = "file name", 656 }, 657 658 /* Options that are passed on, but have special semantics with -drive */ 659 { 660 .name = "read-only", 661 .type = QEMU_OPT_BOOL, 662 .help = "open drive file as read-only", 663 },{ 664 .name = "rerror", 665 .type = QEMU_OPT_STRING, 666 .help = "read error action", 667 },{ 668 .name = "werror", 669 .type = QEMU_OPT_STRING, 670 .help = "write error action", 671 },{ 672 .name = "copy-on-read", 673 .type = QEMU_OPT_BOOL, 674 .help = "copy read data from backing file into image file", 675 }, 676 677 { /* end of list */ } 678 }, 679 }; 680 681 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 682 { 683 const char *value; 684 BlockBackend *blk; 685 DriveInfo *dinfo = NULL; 686 QDict *bs_opts; 687 QemuOpts *legacy_opts; 688 DriveMediaType media = MEDIA_DISK; 689 BlockInterfaceType type; 690 int cyls, heads, secs, translation; 691 int max_devs, bus_id, unit_id, index; 692 const char *devaddr; 693 const char *werror, *rerror; 694 bool read_only = false; 695 bool copy_on_read; 696 const char *serial; 697 const char *filename; 698 Error *local_err = NULL; 699 int i; 700 701 /* Change legacy command line options into QMP ones */ 702 static const struct { 703 const char *from; 704 const char *to; 705 } opt_renames[] = { 706 { "iops", "throttling.iops-total" }, 707 { "iops_rd", "throttling.iops-read" }, 708 { "iops_wr", "throttling.iops-write" }, 709 710 { "bps", "throttling.bps-total" }, 711 { "bps_rd", "throttling.bps-read" }, 712 { "bps_wr", "throttling.bps-write" }, 713 714 { "iops_max", "throttling.iops-total-max" }, 715 { "iops_rd_max", "throttling.iops-read-max" }, 716 { "iops_wr_max", "throttling.iops-write-max" }, 717 718 { "bps_max", "throttling.bps-total-max" }, 719 { "bps_rd_max", "throttling.bps-read-max" }, 720 { "bps_wr_max", "throttling.bps-write-max" }, 721 722 { "iops_size", "throttling.iops-size" }, 723 724 { "readonly", "read-only" }, 725 }; 726 727 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) { 728 qemu_opt_rename(all_opts, opt_renames[i].from, opt_renames[i].to, 729 &local_err); 730 if (local_err) { 731 error_report("%s", error_get_pretty(local_err)); 732 error_free(local_err); 733 return NULL; 734 } 735 } 736 737 value = qemu_opt_get(all_opts, "cache"); 738 if (value) { 739 int flags = 0; 740 741 if (bdrv_parse_cache_flags(value, &flags) != 0) { 742 error_report("invalid cache option"); 743 return NULL; 744 } 745 746 /* Specific options take precedence */ 747 if (!qemu_opt_get(all_opts, "cache.writeback")) { 748 qemu_opt_set_bool(all_opts, "cache.writeback", 749 !!(flags & BDRV_O_CACHE_WB)); 750 } 751 if (!qemu_opt_get(all_opts, "cache.direct")) { 752 qemu_opt_set_bool(all_opts, "cache.direct", 753 !!(flags & BDRV_O_NOCACHE)); 754 } 755 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 756 qemu_opt_set_bool(all_opts, "cache.no-flush", 757 !!(flags & BDRV_O_NO_FLUSH)); 758 } 759 qemu_opt_unset(all_opts, "cache"); 760 } 761 762 /* Get a QDict for processing the options */ 763 bs_opts = qdict_new(); 764 qemu_opts_to_qdict(all_opts, bs_opts); 765 766 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 767 &error_abort); 768 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 769 if (local_err) { 770 error_report("%s", error_get_pretty(local_err)); 771 error_free(local_err); 772 goto fail; 773 } 774 775 /* Deprecated option boot=[on|off] */ 776 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 777 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 778 "ignored. Future versions will reject this parameter. Please " 779 "update your scripts.\n"); 780 } 781 782 /* Media type */ 783 value = qemu_opt_get(legacy_opts, "media"); 784 if (value) { 785 if (!strcmp(value, "disk")) { 786 media = MEDIA_DISK; 787 } else if (!strcmp(value, "cdrom")) { 788 media = MEDIA_CDROM; 789 read_only = true; 790 } else { 791 error_report("'%s' invalid media", value); 792 goto fail; 793 } 794 } 795 796 /* copy-on-read is disabled with a warning for read-only devices */ 797 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 798 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 799 800 if (read_only && copy_on_read) { 801 error_report("warning: disabling copy-on-read on read-only drive"); 802 copy_on_read = false; 803 } 804 805 qdict_put(bs_opts, "read-only", 806 qstring_from_str(read_only ? "on" : "off")); 807 qdict_put(bs_opts, "copy-on-read", 808 qstring_from_str(copy_on_read ? "on" :"off")); 809 810 /* Controller type */ 811 value = qemu_opt_get(legacy_opts, "if"); 812 if (value) { 813 for (type = 0; 814 type < IF_COUNT && strcmp(value, if_name[type]); 815 type++) { 816 } 817 if (type == IF_COUNT) { 818 error_report("unsupported bus type '%s'", value); 819 goto fail; 820 } 821 } else { 822 type = block_default_type; 823 } 824 825 /* Geometry */ 826 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 827 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 828 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 829 830 if (cyls || heads || secs) { 831 if (cyls < 1) { 832 error_report("invalid physical cyls number"); 833 goto fail; 834 } 835 if (heads < 1) { 836 error_report("invalid physical heads number"); 837 goto fail; 838 } 839 if (secs < 1) { 840 error_report("invalid physical secs number"); 841 goto fail; 842 } 843 } 844 845 translation = BIOS_ATA_TRANSLATION_AUTO; 846 value = qemu_opt_get(legacy_opts, "trans"); 847 if (value != NULL) { 848 if (!cyls) { 849 error_report("'%s' trans must be used with cyls, heads and secs", 850 value); 851 goto fail; 852 } 853 if (!strcmp(value, "none")) { 854 translation = BIOS_ATA_TRANSLATION_NONE; 855 } else if (!strcmp(value, "lba")) { 856 translation = BIOS_ATA_TRANSLATION_LBA; 857 } else if (!strcmp(value, "large")) { 858 translation = BIOS_ATA_TRANSLATION_LARGE; 859 } else if (!strcmp(value, "rechs")) { 860 translation = BIOS_ATA_TRANSLATION_RECHS; 861 } else if (!strcmp(value, "auto")) { 862 translation = BIOS_ATA_TRANSLATION_AUTO; 863 } else { 864 error_report("'%s' invalid translation type", value); 865 goto fail; 866 } 867 } 868 869 if (media == MEDIA_CDROM) { 870 if (cyls || secs || heads) { 871 error_report("CHS can't be set with media=cdrom"); 872 goto fail; 873 } 874 } 875 876 /* Device address specified by bus/unit or index. 877 * If none was specified, try to find the first free one. */ 878 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 879 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 880 index = qemu_opt_get_number(legacy_opts, "index", -1); 881 882 max_devs = if_max_devs[type]; 883 884 if (index != -1) { 885 if (bus_id != 0 || unit_id != -1) { 886 error_report("index cannot be used with bus and unit"); 887 goto fail; 888 } 889 bus_id = drive_index_to_bus_id(type, index); 890 unit_id = drive_index_to_unit_id(type, index); 891 } 892 893 if (unit_id == -1) { 894 unit_id = 0; 895 while (drive_get(type, bus_id, unit_id) != NULL) { 896 unit_id++; 897 if (max_devs && unit_id >= max_devs) { 898 unit_id -= max_devs; 899 bus_id++; 900 } 901 } 902 } 903 904 if (max_devs && unit_id >= max_devs) { 905 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 906 goto fail; 907 } 908 909 if (drive_get(type, bus_id, unit_id) != NULL) { 910 error_report("drive with bus=%d, unit=%d (index=%d) exists", 911 bus_id, unit_id, index); 912 goto fail; 913 } 914 915 /* Serial number */ 916 serial = qemu_opt_get(legacy_opts, "serial"); 917 918 /* no id supplied -> create one */ 919 if (qemu_opts_id(all_opts) == NULL) { 920 char *new_id; 921 const char *mediastr = ""; 922 if (type == IF_IDE || type == IF_SCSI) { 923 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 924 } 925 if (max_devs) { 926 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 927 mediastr, unit_id); 928 } else { 929 new_id = g_strdup_printf("%s%s%i", if_name[type], 930 mediastr, unit_id); 931 } 932 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 933 g_free(new_id); 934 } 935 936 /* Add virtio block device */ 937 devaddr = qemu_opt_get(legacy_opts, "addr"); 938 if (devaddr && type != IF_VIRTIO) { 939 error_report("addr is not supported by this bus type"); 940 goto fail; 941 } 942 943 if (type == IF_VIRTIO) { 944 QemuOpts *devopts; 945 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 946 &error_abort); 947 if (arch_type == QEMU_ARCH_S390X) { 948 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 949 } else { 950 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 951 } 952 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 953 if (devaddr) { 954 qemu_opt_set(devopts, "addr", devaddr); 955 } 956 } 957 958 filename = qemu_opt_get(legacy_opts, "file"); 959 960 /* Check werror/rerror compatibility with if=... */ 961 werror = qemu_opt_get(legacy_opts, "werror"); 962 if (werror != NULL) { 963 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 964 type != IF_NONE) { 965 error_report("werror is not supported by this bus type"); 966 goto fail; 967 } 968 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 969 } 970 971 rerror = qemu_opt_get(legacy_opts, "rerror"); 972 if (rerror != NULL) { 973 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 974 type != IF_NONE) { 975 error_report("rerror is not supported by this bus type"); 976 goto fail; 977 } 978 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 979 } 980 981 /* Actual block device init: Functionality shared with blockdev-add */ 982 blk = blockdev_init(filename, bs_opts, &local_err); 983 bs_opts = NULL; 984 if (!blk) { 985 if (local_err) { 986 error_report("%s", error_get_pretty(local_err)); 987 error_free(local_err); 988 } 989 goto fail; 990 } else { 991 assert(!local_err); 992 } 993 994 /* Create legacy DriveInfo */ 995 dinfo = g_malloc0(sizeof(*dinfo)); 996 dinfo->opts = all_opts; 997 998 dinfo->cyls = cyls; 999 dinfo->heads = heads; 1000 dinfo->secs = secs; 1001 dinfo->trans = translation; 1002 1003 dinfo->type = type; 1004 dinfo->bus = bus_id; 1005 dinfo->unit = unit_id; 1006 dinfo->devaddr = devaddr; 1007 dinfo->serial = g_strdup(serial); 1008 1009 blk_set_legacy_dinfo(blk, dinfo); 1010 1011 switch(type) { 1012 case IF_IDE: 1013 case IF_SCSI: 1014 case IF_XEN: 1015 case IF_NONE: 1016 dinfo->media_cd = media == MEDIA_CDROM; 1017 break; 1018 default: 1019 break; 1020 } 1021 1022 fail: 1023 qemu_opts_del(legacy_opts); 1024 QDECREF(bs_opts); 1025 return dinfo; 1026 } 1027 1028 void do_commit(Monitor *mon, const QDict *qdict) 1029 { 1030 const char *device = qdict_get_str(qdict, "device"); 1031 BlockDriverState *bs; 1032 int ret; 1033 1034 if (!strcmp(device, "all")) { 1035 ret = bdrv_commit_all(); 1036 } else { 1037 bs = bdrv_find(device); 1038 if (!bs) { 1039 monitor_printf(mon, "Device '%s' not found\n", device); 1040 return; 1041 } 1042 ret = bdrv_commit(bs); 1043 } 1044 if (ret < 0) { 1045 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1046 strerror(-ret)); 1047 } 1048 } 1049 1050 static void blockdev_do_action(int kind, void *data, Error **errp) 1051 { 1052 TransactionAction action; 1053 TransactionActionList list; 1054 1055 action.kind = kind; 1056 action.data = data; 1057 list.value = &action; 1058 list.next = NULL; 1059 qmp_transaction(&list, errp); 1060 } 1061 1062 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1063 bool has_node_name, const char *node_name, 1064 const char *snapshot_file, 1065 bool has_snapshot_node_name, 1066 const char *snapshot_node_name, 1067 bool has_format, const char *format, 1068 bool has_mode, NewImageMode mode, Error **errp) 1069 { 1070 BlockdevSnapshot snapshot = { 1071 .has_device = has_device, 1072 .device = (char *) device, 1073 .has_node_name = has_node_name, 1074 .node_name = (char *) node_name, 1075 .snapshot_file = (char *) snapshot_file, 1076 .has_snapshot_node_name = has_snapshot_node_name, 1077 .snapshot_node_name = (char *) snapshot_node_name, 1078 .has_format = has_format, 1079 .format = (char *) format, 1080 .has_mode = has_mode, 1081 .mode = mode, 1082 }; 1083 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1084 &snapshot, errp); 1085 } 1086 1087 void qmp_blockdev_snapshot_internal_sync(const char *device, 1088 const char *name, 1089 Error **errp) 1090 { 1091 BlockdevSnapshotInternal snapshot = { 1092 .device = (char *) device, 1093 .name = (char *) name 1094 }; 1095 1096 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1097 &snapshot, errp); 1098 } 1099 1100 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1101 bool has_id, 1102 const char *id, 1103 bool has_name, 1104 const char *name, 1105 Error **errp) 1106 { 1107 BlockDriverState *bs = bdrv_find(device); 1108 AioContext *aio_context; 1109 QEMUSnapshotInfo sn; 1110 Error *local_err = NULL; 1111 SnapshotInfo *info = NULL; 1112 int ret; 1113 1114 if (!bs) { 1115 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1116 return NULL; 1117 } 1118 1119 if (!has_id) { 1120 id = NULL; 1121 } 1122 1123 if (!has_name) { 1124 name = NULL; 1125 } 1126 1127 if (!id && !name) { 1128 error_setg(errp, "Name or id must be provided"); 1129 return NULL; 1130 } 1131 1132 aio_context = bdrv_get_aio_context(bs); 1133 aio_context_acquire(aio_context); 1134 1135 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) { 1136 goto out_aio_context; 1137 } 1138 1139 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1140 if (local_err) { 1141 error_propagate(errp, local_err); 1142 goto out_aio_context; 1143 } 1144 if (!ret) { 1145 error_setg(errp, 1146 "Snapshot with id '%s' and name '%s' does not exist on " 1147 "device '%s'", 1148 STR_OR_NULL(id), STR_OR_NULL(name), device); 1149 goto out_aio_context; 1150 } 1151 1152 bdrv_snapshot_delete(bs, id, name, &local_err); 1153 if (local_err) { 1154 error_propagate(errp, local_err); 1155 goto out_aio_context; 1156 } 1157 1158 aio_context_release(aio_context); 1159 1160 info = g_new0(SnapshotInfo, 1); 1161 info->id = g_strdup(sn.id_str); 1162 info->name = g_strdup(sn.name); 1163 info->date_nsec = sn.date_nsec; 1164 info->date_sec = sn.date_sec; 1165 info->vm_state_size = sn.vm_state_size; 1166 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1167 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1168 1169 return info; 1170 1171 out_aio_context: 1172 aio_context_release(aio_context); 1173 return NULL; 1174 } 1175 1176 /* New and old BlockDriverState structs for atomic group operations */ 1177 1178 typedef struct BlkTransactionState BlkTransactionState; 1179 1180 /* Only prepare() may fail. In a single transaction, only one of commit() or 1181 abort() will be called, clean() will always be called if it present. */ 1182 typedef struct BdrvActionOps { 1183 /* Size of state struct, in bytes. */ 1184 size_t instance_size; 1185 /* Prepare the work, must NOT be NULL. */ 1186 void (*prepare)(BlkTransactionState *common, Error **errp); 1187 /* Commit the changes, can be NULL. */ 1188 void (*commit)(BlkTransactionState *common); 1189 /* Abort the changes on fail, can be NULL. */ 1190 void (*abort)(BlkTransactionState *common); 1191 /* Clean up resource in the end, can be NULL. */ 1192 void (*clean)(BlkTransactionState *common); 1193 } BdrvActionOps; 1194 1195 /* 1196 * This structure must be arranged as first member in child type, assuming 1197 * that compiler will also arrange it to the same address with parent instance. 1198 * Later it will be used in free(). 1199 */ 1200 struct BlkTransactionState { 1201 TransactionAction *action; 1202 const BdrvActionOps *ops; 1203 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1204 }; 1205 1206 /* internal snapshot private data */ 1207 typedef struct InternalSnapshotState { 1208 BlkTransactionState common; 1209 BlockDriverState *bs; 1210 AioContext *aio_context; 1211 QEMUSnapshotInfo sn; 1212 } InternalSnapshotState; 1213 1214 static void internal_snapshot_prepare(BlkTransactionState *common, 1215 Error **errp) 1216 { 1217 Error *local_err = NULL; 1218 const char *device; 1219 const char *name; 1220 BlockDriverState *bs; 1221 QEMUSnapshotInfo old_sn, *sn; 1222 bool ret; 1223 qemu_timeval tv; 1224 BlockdevSnapshotInternal *internal; 1225 InternalSnapshotState *state; 1226 int ret1; 1227 1228 g_assert(common->action->kind == 1229 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1230 internal = common->action->blockdev_snapshot_internal_sync; 1231 state = DO_UPCAST(InternalSnapshotState, common, common); 1232 1233 /* 1. parse input */ 1234 device = internal->device; 1235 name = internal->name; 1236 1237 /* 2. check for validation */ 1238 bs = bdrv_find(device); 1239 if (!bs) { 1240 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1241 return; 1242 } 1243 1244 /* AioContext is released in .clean() */ 1245 state->aio_context = bdrv_get_aio_context(bs); 1246 aio_context_acquire(state->aio_context); 1247 1248 if (!bdrv_is_inserted(bs)) { 1249 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1250 return; 1251 } 1252 1253 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) { 1254 return; 1255 } 1256 1257 if (bdrv_is_read_only(bs)) { 1258 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1259 return; 1260 } 1261 1262 if (!bdrv_can_snapshot(bs)) { 1263 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1264 bs->drv->format_name, device, "internal snapshot"); 1265 return; 1266 } 1267 1268 if (!strlen(name)) { 1269 error_setg(errp, "Name is empty"); 1270 return; 1271 } 1272 1273 /* check whether a snapshot with name exist */ 1274 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1275 &local_err); 1276 if (local_err) { 1277 error_propagate(errp, local_err); 1278 return; 1279 } else if (ret) { 1280 error_setg(errp, 1281 "Snapshot with name '%s' already exists on device '%s'", 1282 name, device); 1283 return; 1284 } 1285 1286 /* 3. take the snapshot */ 1287 sn = &state->sn; 1288 pstrcpy(sn->name, sizeof(sn->name), name); 1289 qemu_gettimeofday(&tv); 1290 sn->date_sec = tv.tv_sec; 1291 sn->date_nsec = tv.tv_usec * 1000; 1292 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1293 1294 ret1 = bdrv_snapshot_create(bs, sn); 1295 if (ret1 < 0) { 1296 error_setg_errno(errp, -ret1, 1297 "Failed to create snapshot '%s' on device '%s'", 1298 name, device); 1299 return; 1300 } 1301 1302 /* 4. succeed, mark a snapshot is created */ 1303 state->bs = bs; 1304 } 1305 1306 static void internal_snapshot_abort(BlkTransactionState *common) 1307 { 1308 InternalSnapshotState *state = 1309 DO_UPCAST(InternalSnapshotState, common, common); 1310 BlockDriverState *bs = state->bs; 1311 QEMUSnapshotInfo *sn = &state->sn; 1312 Error *local_error = NULL; 1313 1314 if (!bs) { 1315 return; 1316 } 1317 1318 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1319 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1320 "device '%s' in abort: %s", 1321 sn->id_str, 1322 sn->name, 1323 bdrv_get_device_name(bs), 1324 error_get_pretty(local_error)); 1325 error_free(local_error); 1326 } 1327 } 1328 1329 static void internal_snapshot_clean(BlkTransactionState *common) 1330 { 1331 InternalSnapshotState *state = DO_UPCAST(InternalSnapshotState, 1332 common, common); 1333 1334 if (state->aio_context) { 1335 aio_context_release(state->aio_context); 1336 } 1337 } 1338 1339 /* external snapshot private data */ 1340 typedef struct ExternalSnapshotState { 1341 BlkTransactionState common; 1342 BlockDriverState *old_bs; 1343 BlockDriverState *new_bs; 1344 AioContext *aio_context; 1345 } ExternalSnapshotState; 1346 1347 static void external_snapshot_prepare(BlkTransactionState *common, 1348 Error **errp) 1349 { 1350 BlockDriver *drv; 1351 int flags, ret; 1352 QDict *options = NULL; 1353 Error *local_err = NULL; 1354 bool has_device = false; 1355 const char *device; 1356 bool has_node_name = false; 1357 const char *node_name; 1358 bool has_snapshot_node_name = false; 1359 const char *snapshot_node_name; 1360 const char *new_image_file; 1361 const char *format = "qcow2"; 1362 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1363 ExternalSnapshotState *state = 1364 DO_UPCAST(ExternalSnapshotState, common, common); 1365 TransactionAction *action = common->action; 1366 1367 /* get parameters */ 1368 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1369 1370 has_device = action->blockdev_snapshot_sync->has_device; 1371 device = action->blockdev_snapshot_sync->device; 1372 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1373 node_name = action->blockdev_snapshot_sync->node_name; 1374 has_snapshot_node_name = 1375 action->blockdev_snapshot_sync->has_snapshot_node_name; 1376 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1377 1378 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1379 if (action->blockdev_snapshot_sync->has_format) { 1380 format = action->blockdev_snapshot_sync->format; 1381 } 1382 if (action->blockdev_snapshot_sync->has_mode) { 1383 mode = action->blockdev_snapshot_sync->mode; 1384 } 1385 1386 /* start processing */ 1387 drv = bdrv_find_format(format); 1388 if (!drv) { 1389 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1390 return; 1391 } 1392 1393 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1394 has_node_name ? node_name : NULL, 1395 &local_err); 1396 if (local_err) { 1397 error_propagate(errp, local_err); 1398 return; 1399 } 1400 1401 if (has_node_name && !has_snapshot_node_name) { 1402 error_setg(errp, "New snapshot node name missing"); 1403 return; 1404 } 1405 1406 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1407 error_setg(errp, "New snapshot node name already existing"); 1408 return; 1409 } 1410 1411 /* Acquire AioContext now so any threads operating on old_bs stop */ 1412 state->aio_context = bdrv_get_aio_context(state->old_bs); 1413 aio_context_acquire(state->aio_context); 1414 1415 if (!bdrv_is_inserted(state->old_bs)) { 1416 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1417 return; 1418 } 1419 1420 if (bdrv_op_is_blocked(state->old_bs, 1421 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1422 return; 1423 } 1424 1425 if (!bdrv_is_read_only(state->old_bs)) { 1426 if (bdrv_flush(state->old_bs)) { 1427 error_set(errp, QERR_IO_ERROR); 1428 return; 1429 } 1430 } 1431 1432 if (!bdrv_is_first_non_filter(state->old_bs)) { 1433 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1434 return; 1435 } 1436 1437 flags = state->old_bs->open_flags; 1438 1439 /* create new image w/backing file */ 1440 if (mode != NEW_IMAGE_MODE_EXISTING) { 1441 bdrv_img_create(new_image_file, format, 1442 state->old_bs->filename, 1443 state->old_bs->drv->format_name, 1444 NULL, -1, flags, &local_err, false); 1445 if (local_err) { 1446 error_propagate(errp, local_err); 1447 return; 1448 } 1449 } 1450 1451 if (has_snapshot_node_name) { 1452 options = qdict_new(); 1453 qdict_put(options, "node-name", 1454 qstring_from_str(snapshot_node_name)); 1455 } 1456 1457 /* TODO Inherit bs->options or only take explicit options with an 1458 * extended QMP command? */ 1459 assert(state->new_bs == NULL); 1460 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1461 flags | BDRV_O_NO_BACKING, drv, &local_err); 1462 /* We will manually add the backing_hd field to the bs later */ 1463 if (ret != 0) { 1464 error_propagate(errp, local_err); 1465 } 1466 } 1467 1468 static void external_snapshot_commit(BlkTransactionState *common) 1469 { 1470 ExternalSnapshotState *state = 1471 DO_UPCAST(ExternalSnapshotState, common, common); 1472 1473 bdrv_set_aio_context(state->new_bs, state->aio_context); 1474 1475 /* This removes our old bs and adds the new bs */ 1476 bdrv_append(state->new_bs, state->old_bs); 1477 /* We don't need (or want) to use the transactional 1478 * bdrv_reopen_multiple() across all the entries at once, because we 1479 * don't want to abort all of them if one of them fails the reopen */ 1480 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1481 NULL); 1482 1483 aio_context_release(state->aio_context); 1484 } 1485 1486 static void external_snapshot_abort(BlkTransactionState *common) 1487 { 1488 ExternalSnapshotState *state = 1489 DO_UPCAST(ExternalSnapshotState, common, common); 1490 if (state->new_bs) { 1491 bdrv_unref(state->new_bs); 1492 } 1493 if (state->aio_context) { 1494 aio_context_release(state->aio_context); 1495 } 1496 } 1497 1498 typedef struct DriveBackupState { 1499 BlkTransactionState common; 1500 BlockDriverState *bs; 1501 AioContext *aio_context; 1502 BlockJob *job; 1503 } DriveBackupState; 1504 1505 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1506 { 1507 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1508 BlockDriverState *bs; 1509 DriveBackup *backup; 1510 Error *local_err = NULL; 1511 1512 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1513 backup = common->action->drive_backup; 1514 1515 bs = bdrv_find(backup->device); 1516 if (!bs) { 1517 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device); 1518 return; 1519 } 1520 1521 /* AioContext is released in .clean() */ 1522 state->aio_context = bdrv_get_aio_context(bs); 1523 aio_context_acquire(state->aio_context); 1524 1525 qmp_drive_backup(backup->device, backup->target, 1526 backup->has_format, backup->format, 1527 backup->sync, 1528 backup->has_mode, backup->mode, 1529 backup->has_speed, backup->speed, 1530 backup->has_on_source_error, backup->on_source_error, 1531 backup->has_on_target_error, backup->on_target_error, 1532 &local_err); 1533 if (local_err) { 1534 error_propagate(errp, local_err); 1535 return; 1536 } 1537 1538 state->bs = bs; 1539 state->job = state->bs->job; 1540 } 1541 1542 static void drive_backup_abort(BlkTransactionState *common) 1543 { 1544 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1545 BlockDriverState *bs = state->bs; 1546 1547 /* Only cancel if it's the job we started */ 1548 if (bs && bs->job && bs->job == state->job) { 1549 block_job_cancel_sync(bs->job); 1550 } 1551 } 1552 1553 static void drive_backup_clean(BlkTransactionState *common) 1554 { 1555 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1556 1557 if (state->aio_context) { 1558 aio_context_release(state->aio_context); 1559 } 1560 } 1561 1562 typedef struct BlockdevBackupState { 1563 BlkTransactionState common; 1564 BlockDriverState *bs; 1565 BlockJob *job; 1566 AioContext *aio_context; 1567 } BlockdevBackupState; 1568 1569 static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) 1570 { 1571 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1572 BlockdevBackup *backup; 1573 BlockDriverState *bs, *target; 1574 Error *local_err = NULL; 1575 1576 assert(common->action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP); 1577 backup = common->action->blockdev_backup; 1578 1579 bs = bdrv_find(backup->device); 1580 if (!bs) { 1581 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->device); 1582 return; 1583 } 1584 1585 target = bdrv_find(backup->target); 1586 if (!target) { 1587 error_set(errp, QERR_DEVICE_NOT_FOUND, backup->target); 1588 return; 1589 } 1590 1591 /* AioContext is released in .clean() */ 1592 state->aio_context = bdrv_get_aio_context(bs); 1593 if (state->aio_context != bdrv_get_aio_context(target)) { 1594 state->aio_context = NULL; 1595 error_setg(errp, "Backup between two IO threads is not implemented"); 1596 return; 1597 } 1598 aio_context_acquire(state->aio_context); 1599 1600 qmp_blockdev_backup(backup->device, backup->target, 1601 backup->sync, 1602 backup->has_speed, backup->speed, 1603 backup->has_on_source_error, backup->on_source_error, 1604 backup->has_on_target_error, backup->on_target_error, 1605 &local_err); 1606 if (local_err) { 1607 error_propagate(errp, local_err); 1608 return; 1609 } 1610 1611 state->bs = bs; 1612 state->job = state->bs->job; 1613 } 1614 1615 static void blockdev_backup_abort(BlkTransactionState *common) 1616 { 1617 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1618 BlockDriverState *bs = state->bs; 1619 1620 /* Only cancel if it's the job we started */ 1621 if (bs && bs->job && bs->job == state->job) { 1622 block_job_cancel_sync(bs->job); 1623 } 1624 } 1625 1626 static void blockdev_backup_clean(BlkTransactionState *common) 1627 { 1628 BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); 1629 1630 if (state->aio_context) { 1631 aio_context_release(state->aio_context); 1632 } 1633 } 1634 1635 static void abort_prepare(BlkTransactionState *common, Error **errp) 1636 { 1637 error_setg(errp, "Transaction aborted using Abort action"); 1638 } 1639 1640 static void abort_commit(BlkTransactionState *common) 1641 { 1642 g_assert_not_reached(); /* this action never succeeds */ 1643 } 1644 1645 static const BdrvActionOps actions[] = { 1646 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1647 .instance_size = sizeof(ExternalSnapshotState), 1648 .prepare = external_snapshot_prepare, 1649 .commit = external_snapshot_commit, 1650 .abort = external_snapshot_abort, 1651 }, 1652 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1653 .instance_size = sizeof(DriveBackupState), 1654 .prepare = drive_backup_prepare, 1655 .abort = drive_backup_abort, 1656 .clean = drive_backup_clean, 1657 }, 1658 [TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP] = { 1659 .instance_size = sizeof(BlockdevBackupState), 1660 .prepare = blockdev_backup_prepare, 1661 .abort = blockdev_backup_abort, 1662 .clean = blockdev_backup_clean, 1663 }, 1664 [TRANSACTION_ACTION_KIND_ABORT] = { 1665 .instance_size = sizeof(BlkTransactionState), 1666 .prepare = abort_prepare, 1667 .commit = abort_commit, 1668 }, 1669 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1670 .instance_size = sizeof(InternalSnapshotState), 1671 .prepare = internal_snapshot_prepare, 1672 .abort = internal_snapshot_abort, 1673 .clean = internal_snapshot_clean, 1674 }, 1675 }; 1676 1677 /* 1678 * 'Atomic' group operations. The operations are performed as a set, and if 1679 * any fail then we roll back all operations in the group. 1680 */ 1681 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1682 { 1683 TransactionActionList *dev_entry = dev_list; 1684 BlkTransactionState *state, *next; 1685 Error *local_err = NULL; 1686 1687 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1688 QSIMPLEQ_INIT(&snap_bdrv_states); 1689 1690 /* drain all i/o before any operations */ 1691 bdrv_drain_all(); 1692 1693 /* We don't do anything in this loop that commits us to the operations */ 1694 while (NULL != dev_entry) { 1695 TransactionAction *dev_info = NULL; 1696 const BdrvActionOps *ops; 1697 1698 dev_info = dev_entry->value; 1699 dev_entry = dev_entry->next; 1700 1701 assert(dev_info->kind < ARRAY_SIZE(actions)); 1702 1703 ops = &actions[dev_info->kind]; 1704 assert(ops->instance_size > 0); 1705 1706 state = g_malloc0(ops->instance_size); 1707 state->ops = ops; 1708 state->action = dev_info; 1709 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1710 1711 state->ops->prepare(state, &local_err); 1712 if (local_err) { 1713 error_propagate(errp, local_err); 1714 goto delete_and_fail; 1715 } 1716 } 1717 1718 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1719 if (state->ops->commit) { 1720 state->ops->commit(state); 1721 } 1722 } 1723 1724 /* success */ 1725 goto exit; 1726 1727 delete_and_fail: 1728 /* failure, and it is all-or-none; roll back all operations */ 1729 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1730 if (state->ops->abort) { 1731 state->ops->abort(state); 1732 } 1733 } 1734 exit: 1735 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1736 if (state->ops->clean) { 1737 state->ops->clean(state); 1738 } 1739 g_free(state); 1740 } 1741 } 1742 1743 1744 static void eject_device(BlockBackend *blk, int force, Error **errp) 1745 { 1746 BlockDriverState *bs = blk_bs(blk); 1747 AioContext *aio_context; 1748 1749 aio_context = bdrv_get_aio_context(bs); 1750 aio_context_acquire(aio_context); 1751 1752 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1753 goto out; 1754 } 1755 if (!blk_dev_has_removable_media(blk)) { 1756 error_setg(errp, "Device '%s' is not removable", 1757 bdrv_get_device_name(bs)); 1758 goto out; 1759 } 1760 1761 if (blk_dev_is_medium_locked(blk) && !blk_dev_is_tray_open(blk)) { 1762 blk_dev_eject_request(blk, force); 1763 if (!force) { 1764 error_setg(errp, "Device '%s' is locked", 1765 bdrv_get_device_name(bs)); 1766 goto out; 1767 } 1768 } 1769 1770 bdrv_close(bs); 1771 1772 out: 1773 aio_context_release(aio_context); 1774 } 1775 1776 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1777 { 1778 BlockBackend *blk; 1779 1780 blk = blk_by_name(device); 1781 if (!blk) { 1782 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1783 return; 1784 } 1785 1786 eject_device(blk, force, errp); 1787 } 1788 1789 void qmp_block_passwd(bool has_device, const char *device, 1790 bool has_node_name, const char *node_name, 1791 const char *password, Error **errp) 1792 { 1793 Error *local_err = NULL; 1794 BlockDriverState *bs; 1795 AioContext *aio_context; 1796 int err; 1797 1798 bs = bdrv_lookup_bs(has_device ? device : NULL, 1799 has_node_name ? node_name : NULL, 1800 &local_err); 1801 if (local_err) { 1802 error_propagate(errp, local_err); 1803 return; 1804 } 1805 1806 aio_context = bdrv_get_aio_context(bs); 1807 aio_context_acquire(aio_context); 1808 1809 err = bdrv_set_key(bs, password); 1810 if (err == -EINVAL) { 1811 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1812 goto out; 1813 } else if (err < 0) { 1814 error_set(errp, QERR_INVALID_PASSWORD); 1815 goto out; 1816 } 1817 1818 out: 1819 aio_context_release(aio_context); 1820 } 1821 1822 /* Assumes AioContext is held */ 1823 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1824 int bdrv_flags, BlockDriver *drv, 1825 const char *password, Error **errp) 1826 { 1827 Error *local_err = NULL; 1828 int ret; 1829 1830 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1831 if (ret < 0) { 1832 error_propagate(errp, local_err); 1833 return; 1834 } 1835 1836 if (bdrv_key_required(bs)) { 1837 if (password) { 1838 if (bdrv_set_key(bs, password) < 0) { 1839 error_set(errp, QERR_INVALID_PASSWORD); 1840 } 1841 } else { 1842 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1843 bdrv_get_encrypted_filename(bs)); 1844 } 1845 } else if (password) { 1846 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1847 } 1848 } 1849 1850 void qmp_change_blockdev(const char *device, const char *filename, 1851 const char *format, Error **errp) 1852 { 1853 BlockBackend *blk; 1854 BlockDriverState *bs; 1855 AioContext *aio_context; 1856 BlockDriver *drv = NULL; 1857 int bdrv_flags; 1858 Error *err = NULL; 1859 1860 blk = blk_by_name(device); 1861 if (!blk) { 1862 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1863 return; 1864 } 1865 bs = blk_bs(blk); 1866 1867 aio_context = bdrv_get_aio_context(bs); 1868 aio_context_acquire(aio_context); 1869 1870 if (format) { 1871 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1872 if (!drv) { 1873 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1874 goto out; 1875 } 1876 } 1877 1878 eject_device(blk, 0, &err); 1879 if (err) { 1880 error_propagate(errp, err); 1881 goto out; 1882 } 1883 1884 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1885 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1886 1887 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1888 1889 out: 1890 aio_context_release(aio_context); 1891 } 1892 1893 /* throttling disk I/O limits */ 1894 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1895 int64_t bps_wr, 1896 int64_t iops, 1897 int64_t iops_rd, 1898 int64_t iops_wr, 1899 bool has_bps_max, 1900 int64_t bps_max, 1901 bool has_bps_rd_max, 1902 int64_t bps_rd_max, 1903 bool has_bps_wr_max, 1904 int64_t bps_wr_max, 1905 bool has_iops_max, 1906 int64_t iops_max, 1907 bool has_iops_rd_max, 1908 int64_t iops_rd_max, 1909 bool has_iops_wr_max, 1910 int64_t iops_wr_max, 1911 bool has_iops_size, 1912 int64_t iops_size, Error **errp) 1913 { 1914 ThrottleConfig cfg; 1915 BlockDriverState *bs; 1916 AioContext *aio_context; 1917 1918 bs = bdrv_find(device); 1919 if (!bs) { 1920 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1921 return; 1922 } 1923 1924 memset(&cfg, 0, sizeof(cfg)); 1925 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1926 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1927 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1928 1929 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1930 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1931 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1932 1933 if (has_bps_max) { 1934 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1935 } 1936 if (has_bps_rd_max) { 1937 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1938 } 1939 if (has_bps_wr_max) { 1940 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1941 } 1942 if (has_iops_max) { 1943 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1944 } 1945 if (has_iops_rd_max) { 1946 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1947 } 1948 if (has_iops_wr_max) { 1949 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1950 } 1951 1952 if (has_iops_size) { 1953 cfg.op_size = iops_size; 1954 } 1955 1956 if (!check_throttle_config(&cfg, errp)) { 1957 return; 1958 } 1959 1960 aio_context = bdrv_get_aio_context(bs); 1961 aio_context_acquire(aio_context); 1962 1963 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1964 bdrv_io_limits_enable(bs); 1965 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1966 bdrv_io_limits_disable(bs); 1967 } 1968 1969 if (bs->io_limits_enabled) { 1970 bdrv_set_io_limits(bs, &cfg); 1971 } 1972 1973 aio_context_release(aio_context); 1974 } 1975 1976 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1977 { 1978 const char *id = qdict_get_str(qdict, "id"); 1979 BlockBackend *blk; 1980 BlockDriverState *bs; 1981 AioContext *aio_context; 1982 Error *local_err = NULL; 1983 1984 blk = blk_by_name(id); 1985 if (!blk) { 1986 error_report("Device '%s' not found", id); 1987 return -1; 1988 } 1989 bs = blk_bs(blk); 1990 1991 if (!blk_legacy_dinfo(blk)) { 1992 error_report("Deleting device added with blockdev-add" 1993 " is not supported"); 1994 return -1; 1995 } 1996 1997 aio_context = bdrv_get_aio_context(bs); 1998 aio_context_acquire(aio_context); 1999 2000 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 2001 error_report("%s", error_get_pretty(local_err)); 2002 error_free(local_err); 2003 aio_context_release(aio_context); 2004 return -1; 2005 } 2006 2007 /* quiesce block driver; prevent further io */ 2008 bdrv_drain_all(); 2009 bdrv_flush(bs); 2010 bdrv_close(bs); 2011 2012 /* if we have a device attached to this BlockDriverState 2013 * then we need to make the drive anonymous until the device 2014 * can be removed. If this is a drive with no device backing 2015 * then we can just get rid of the block driver state right here. 2016 */ 2017 if (blk_get_attached_dev(blk)) { 2018 blk_hide_on_behalf_of_do_drive_del(blk); 2019 /* Further I/O must not pause the guest */ 2020 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 2021 BLOCKDEV_ON_ERROR_REPORT); 2022 } else { 2023 blk_unref(blk); 2024 } 2025 2026 aio_context_release(aio_context); 2027 return 0; 2028 } 2029 2030 void qmp_block_resize(bool has_device, const char *device, 2031 bool has_node_name, const char *node_name, 2032 int64_t size, Error **errp) 2033 { 2034 Error *local_err = NULL; 2035 BlockDriverState *bs; 2036 AioContext *aio_context; 2037 int ret; 2038 2039 bs = bdrv_lookup_bs(has_device ? device : NULL, 2040 has_node_name ? node_name : NULL, 2041 &local_err); 2042 if (local_err) { 2043 error_propagate(errp, local_err); 2044 return; 2045 } 2046 2047 aio_context = bdrv_get_aio_context(bs); 2048 aio_context_acquire(aio_context); 2049 2050 if (!bdrv_is_first_non_filter(bs)) { 2051 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 2052 goto out; 2053 } 2054 2055 if (size < 0) { 2056 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 2057 goto out; 2058 } 2059 2060 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 2061 error_set(errp, QERR_DEVICE_IN_USE, device); 2062 goto out; 2063 } 2064 2065 /* complete all in-flight operations before resizing the device */ 2066 bdrv_drain_all(); 2067 2068 ret = bdrv_truncate(bs, size); 2069 switch (ret) { 2070 case 0: 2071 break; 2072 case -ENOMEDIUM: 2073 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2074 break; 2075 case -ENOTSUP: 2076 error_set(errp, QERR_UNSUPPORTED); 2077 break; 2078 case -EACCES: 2079 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 2080 break; 2081 case -EBUSY: 2082 error_set(errp, QERR_DEVICE_IN_USE, device); 2083 break; 2084 default: 2085 error_setg_errno(errp, -ret, "Could not resize"); 2086 break; 2087 } 2088 2089 out: 2090 aio_context_release(aio_context); 2091 } 2092 2093 static void block_job_cb(void *opaque, int ret) 2094 { 2095 /* Note that this function may be executed from another AioContext besides 2096 * the QEMU main loop. If you need to access anything that assumes the 2097 * QEMU global mutex, use a BH or introduce a mutex. 2098 */ 2099 2100 BlockDriverState *bs = opaque; 2101 const char *msg = NULL; 2102 2103 trace_block_job_cb(bs, bs->job, ret); 2104 2105 assert(bs->job); 2106 2107 if (ret < 0) { 2108 msg = strerror(-ret); 2109 } 2110 2111 if (block_job_is_cancelled(bs->job)) { 2112 block_job_event_cancelled(bs->job); 2113 } else { 2114 block_job_event_completed(bs->job, msg); 2115 } 2116 2117 bdrv_put_ref_bh_schedule(bs); 2118 } 2119 2120 void qmp_block_stream(const char *device, 2121 bool has_base, const char *base, 2122 bool has_backing_file, const char *backing_file, 2123 bool has_speed, int64_t speed, 2124 bool has_on_error, BlockdevOnError on_error, 2125 Error **errp) 2126 { 2127 BlockDriverState *bs; 2128 BlockDriverState *base_bs = NULL; 2129 AioContext *aio_context; 2130 Error *local_err = NULL; 2131 const char *base_name = NULL; 2132 2133 if (!has_on_error) { 2134 on_error = BLOCKDEV_ON_ERROR_REPORT; 2135 } 2136 2137 bs = bdrv_find(device); 2138 if (!bs) { 2139 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2140 return; 2141 } 2142 2143 aio_context = bdrv_get_aio_context(bs); 2144 aio_context_acquire(aio_context); 2145 2146 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 2147 goto out; 2148 } 2149 2150 if (has_base) { 2151 base_bs = bdrv_find_backing_image(bs, base); 2152 if (base_bs == NULL) { 2153 error_set(errp, QERR_BASE_NOT_FOUND, base); 2154 goto out; 2155 } 2156 assert(bdrv_get_aio_context(base_bs) == aio_context); 2157 base_name = base; 2158 } 2159 2160 /* if we are streaming the entire chain, the result will have no backing 2161 * file, and specifying one is therefore an error */ 2162 if (base_bs == NULL && has_backing_file) { 2163 error_setg(errp, "backing file specified, but streaming the " 2164 "entire chain"); 2165 goto out; 2166 } 2167 2168 /* backing_file string overrides base bs filename */ 2169 base_name = has_backing_file ? backing_file : base_name; 2170 2171 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 2172 on_error, block_job_cb, bs, &local_err); 2173 if (local_err) { 2174 error_propagate(errp, local_err); 2175 goto out; 2176 } 2177 2178 trace_qmp_block_stream(bs, bs->job); 2179 2180 out: 2181 aio_context_release(aio_context); 2182 } 2183 2184 void qmp_block_commit(const char *device, 2185 bool has_base, const char *base, 2186 bool has_top, const char *top, 2187 bool has_backing_file, const char *backing_file, 2188 bool has_speed, int64_t speed, 2189 Error **errp) 2190 { 2191 BlockDriverState *bs; 2192 BlockDriverState *base_bs, *top_bs; 2193 AioContext *aio_context; 2194 Error *local_err = NULL; 2195 /* This will be part of the QMP command, if/when the 2196 * BlockdevOnError change for blkmirror makes it in 2197 */ 2198 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 2199 2200 if (!has_speed) { 2201 speed = 0; 2202 } 2203 2204 /* Important Note: 2205 * libvirt relies on the DeviceNotFound error class in order to probe for 2206 * live commit feature versions; for this to work, we must make sure to 2207 * perform the device lookup before any generic errors that may occur in a 2208 * scenario in which all optional arguments are omitted. */ 2209 bs = bdrv_find(device); 2210 if (!bs) { 2211 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2212 return; 2213 } 2214 2215 aio_context = bdrv_get_aio_context(bs); 2216 aio_context_acquire(aio_context); 2217 2218 /* drain all i/o before commits */ 2219 bdrv_drain_all(); 2220 2221 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) { 2222 goto out; 2223 } 2224 2225 /* default top_bs is the active layer */ 2226 top_bs = bs; 2227 2228 if (has_top && top) { 2229 if (strcmp(bs->filename, top) != 0) { 2230 top_bs = bdrv_find_backing_image(bs, top); 2231 } 2232 } 2233 2234 if (top_bs == NULL) { 2235 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 2236 goto out; 2237 } 2238 2239 assert(bdrv_get_aio_context(top_bs) == aio_context); 2240 2241 if (has_base && base) { 2242 base_bs = bdrv_find_backing_image(top_bs, base); 2243 } else { 2244 base_bs = bdrv_find_base(top_bs); 2245 } 2246 2247 if (base_bs == NULL) { 2248 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 2249 goto out; 2250 } 2251 2252 assert(bdrv_get_aio_context(base_bs) == aio_context); 2253 2254 if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) { 2255 goto out; 2256 } 2257 2258 /* Do not allow attempts to commit an image into itself */ 2259 if (top_bs == base_bs) { 2260 error_setg(errp, "cannot commit an image into itself"); 2261 goto out; 2262 } 2263 2264 if (top_bs == bs) { 2265 if (has_backing_file) { 2266 error_setg(errp, "'backing-file' specified," 2267 " but 'top' is the active layer"); 2268 goto out; 2269 } 2270 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2271 bs, &local_err); 2272 } else { 2273 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2274 has_backing_file ? backing_file : NULL, &local_err); 2275 } 2276 if (local_err != NULL) { 2277 error_propagate(errp, local_err); 2278 goto out; 2279 } 2280 2281 out: 2282 aio_context_release(aio_context); 2283 } 2284 2285 void qmp_drive_backup(const char *device, const char *target, 2286 bool has_format, const char *format, 2287 enum MirrorSyncMode sync, 2288 bool has_mode, enum NewImageMode mode, 2289 bool has_speed, int64_t speed, 2290 bool has_on_source_error, BlockdevOnError on_source_error, 2291 bool has_on_target_error, BlockdevOnError on_target_error, 2292 Error **errp) 2293 { 2294 BlockDriverState *bs; 2295 BlockDriverState *target_bs; 2296 BlockDriverState *source = NULL; 2297 AioContext *aio_context; 2298 BlockDriver *drv = NULL; 2299 Error *local_err = NULL; 2300 int flags; 2301 int64_t size; 2302 int ret; 2303 2304 if (!has_speed) { 2305 speed = 0; 2306 } 2307 if (!has_on_source_error) { 2308 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2309 } 2310 if (!has_on_target_error) { 2311 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2312 } 2313 if (!has_mode) { 2314 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2315 } 2316 2317 bs = bdrv_find(device); 2318 if (!bs) { 2319 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2320 return; 2321 } 2322 2323 aio_context = bdrv_get_aio_context(bs); 2324 aio_context_acquire(aio_context); 2325 2326 /* Although backup_run has this check too, we need to use bs->drv below, so 2327 * do an early check redundantly. */ 2328 if (!bdrv_is_inserted(bs)) { 2329 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2330 goto out; 2331 } 2332 2333 if (!has_format) { 2334 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2335 } 2336 if (format) { 2337 drv = bdrv_find_format(format); 2338 if (!drv) { 2339 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2340 goto out; 2341 } 2342 } 2343 2344 /* Early check to avoid creating target */ 2345 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2346 goto out; 2347 } 2348 2349 flags = bs->open_flags | BDRV_O_RDWR; 2350 2351 /* See if we have a backing HD we can use to create our new image 2352 * on top of. */ 2353 if (sync == MIRROR_SYNC_MODE_TOP) { 2354 source = bs->backing_hd; 2355 if (!source) { 2356 sync = MIRROR_SYNC_MODE_FULL; 2357 } 2358 } 2359 if (sync == MIRROR_SYNC_MODE_NONE) { 2360 source = bs; 2361 } 2362 2363 size = bdrv_getlength(bs); 2364 if (size < 0) { 2365 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2366 goto out; 2367 } 2368 2369 if (mode != NEW_IMAGE_MODE_EXISTING) { 2370 assert(format && drv); 2371 if (source) { 2372 bdrv_img_create(target, format, source->filename, 2373 source->drv->format_name, NULL, 2374 size, flags, &local_err, false); 2375 } else { 2376 bdrv_img_create(target, format, NULL, NULL, NULL, 2377 size, flags, &local_err, false); 2378 } 2379 } 2380 2381 if (local_err) { 2382 error_propagate(errp, local_err); 2383 goto out; 2384 } 2385 2386 target_bs = NULL; 2387 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2388 if (ret < 0) { 2389 error_propagate(errp, local_err); 2390 goto out; 2391 } 2392 2393 bdrv_set_aio_context(target_bs, aio_context); 2394 2395 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2396 block_job_cb, bs, &local_err); 2397 if (local_err != NULL) { 2398 bdrv_unref(target_bs); 2399 error_propagate(errp, local_err); 2400 goto out; 2401 } 2402 2403 out: 2404 aio_context_release(aio_context); 2405 } 2406 2407 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2408 { 2409 return bdrv_named_nodes_list(); 2410 } 2411 2412 void qmp_blockdev_backup(const char *device, const char *target, 2413 enum MirrorSyncMode sync, 2414 bool has_speed, int64_t speed, 2415 bool has_on_source_error, 2416 BlockdevOnError on_source_error, 2417 bool has_on_target_error, 2418 BlockdevOnError on_target_error, 2419 Error **errp) 2420 { 2421 BlockDriverState *bs; 2422 BlockDriverState *target_bs; 2423 Error *local_err = NULL; 2424 AioContext *aio_context; 2425 2426 if (!has_speed) { 2427 speed = 0; 2428 } 2429 if (!has_on_source_error) { 2430 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2431 } 2432 if (!has_on_target_error) { 2433 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2434 } 2435 2436 bs = bdrv_find(device); 2437 if (!bs) { 2438 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2439 return; 2440 } 2441 2442 aio_context = bdrv_get_aio_context(bs); 2443 aio_context_acquire(aio_context); 2444 2445 target_bs = bdrv_find(target); 2446 if (!target_bs) { 2447 error_set(errp, QERR_DEVICE_NOT_FOUND, target); 2448 goto out; 2449 } 2450 2451 bdrv_ref(target_bs); 2452 bdrv_set_aio_context(target_bs, aio_context); 2453 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2454 block_job_cb, bs, &local_err); 2455 if (local_err != NULL) { 2456 bdrv_unref(target_bs); 2457 error_propagate(errp, local_err); 2458 } 2459 out: 2460 aio_context_release(aio_context); 2461 } 2462 2463 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2464 2465 void qmp_drive_mirror(const char *device, const char *target, 2466 bool has_format, const char *format, 2467 bool has_node_name, const char *node_name, 2468 bool has_replaces, const char *replaces, 2469 enum MirrorSyncMode sync, 2470 bool has_mode, enum NewImageMode mode, 2471 bool has_speed, int64_t speed, 2472 bool has_granularity, uint32_t granularity, 2473 bool has_buf_size, int64_t buf_size, 2474 bool has_on_source_error, BlockdevOnError on_source_error, 2475 bool has_on_target_error, BlockdevOnError on_target_error, 2476 Error **errp) 2477 { 2478 BlockDriverState *bs; 2479 BlockDriverState *source, *target_bs; 2480 AioContext *aio_context; 2481 BlockDriver *drv = NULL; 2482 Error *local_err = NULL; 2483 QDict *options = NULL; 2484 int flags; 2485 int64_t size; 2486 int ret; 2487 2488 if (!has_speed) { 2489 speed = 0; 2490 } 2491 if (!has_on_source_error) { 2492 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2493 } 2494 if (!has_on_target_error) { 2495 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2496 } 2497 if (!has_mode) { 2498 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2499 } 2500 if (!has_granularity) { 2501 granularity = 0; 2502 } 2503 if (!has_buf_size) { 2504 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2505 } 2506 2507 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2508 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2509 "a value in range [512B, 64MB]"); 2510 return; 2511 } 2512 if (granularity & (granularity - 1)) { 2513 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2"); 2514 return; 2515 } 2516 2517 bs = bdrv_find(device); 2518 if (!bs) { 2519 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2520 return; 2521 } 2522 2523 aio_context = bdrv_get_aio_context(bs); 2524 aio_context_acquire(aio_context); 2525 2526 if (!bdrv_is_inserted(bs)) { 2527 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2528 goto out; 2529 } 2530 2531 if (!has_format) { 2532 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2533 } 2534 if (format) { 2535 drv = bdrv_find_format(format); 2536 if (!drv) { 2537 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2538 goto out; 2539 } 2540 } 2541 2542 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2543 goto out; 2544 } 2545 2546 flags = bs->open_flags | BDRV_O_RDWR; 2547 source = bs->backing_hd; 2548 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2549 sync = MIRROR_SYNC_MODE_FULL; 2550 } 2551 if (sync == MIRROR_SYNC_MODE_NONE) { 2552 source = bs; 2553 } 2554 2555 size = bdrv_getlength(bs); 2556 if (size < 0) { 2557 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2558 goto out; 2559 } 2560 2561 if (has_replaces) { 2562 BlockDriverState *to_replace_bs; 2563 AioContext *replace_aio_context; 2564 int64_t replace_size; 2565 2566 if (!has_node_name) { 2567 error_setg(errp, "a node-name must be provided when replacing a" 2568 " named node of the graph"); 2569 goto out; 2570 } 2571 2572 to_replace_bs = check_to_replace_node(replaces, &local_err); 2573 2574 if (!to_replace_bs) { 2575 error_propagate(errp, local_err); 2576 goto out; 2577 } 2578 2579 replace_aio_context = bdrv_get_aio_context(to_replace_bs); 2580 aio_context_acquire(replace_aio_context); 2581 replace_size = bdrv_getlength(to_replace_bs); 2582 aio_context_release(replace_aio_context); 2583 2584 if (size != replace_size) { 2585 error_setg(errp, "cannot replace image with a mirror image of " 2586 "different size"); 2587 goto out; 2588 } 2589 } 2590 2591 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2592 && mode != NEW_IMAGE_MODE_EXISTING) 2593 { 2594 /* create new image w/o backing file */ 2595 assert(format && drv); 2596 bdrv_img_create(target, format, 2597 NULL, NULL, NULL, size, flags, &local_err, false); 2598 } else { 2599 switch (mode) { 2600 case NEW_IMAGE_MODE_EXISTING: 2601 break; 2602 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2603 /* create new image with backing file */ 2604 bdrv_img_create(target, format, 2605 source->filename, 2606 source->drv->format_name, 2607 NULL, size, flags, &local_err, false); 2608 break; 2609 default: 2610 abort(); 2611 } 2612 } 2613 2614 if (local_err) { 2615 error_propagate(errp, local_err); 2616 goto out; 2617 } 2618 2619 if (has_node_name) { 2620 options = qdict_new(); 2621 qdict_put(options, "node-name", qstring_from_str(node_name)); 2622 } 2623 2624 /* Mirroring takes care of copy-on-write using the source's backing 2625 * file. 2626 */ 2627 target_bs = NULL; 2628 ret = bdrv_open(&target_bs, target, NULL, options, 2629 flags | BDRV_O_NO_BACKING, drv, &local_err); 2630 if (ret < 0) { 2631 error_propagate(errp, local_err); 2632 goto out; 2633 } 2634 2635 bdrv_set_aio_context(target_bs, aio_context); 2636 2637 /* pass the node name to replace to mirror start since it's loose coupling 2638 * and will allow to check whether the node still exist at mirror completion 2639 */ 2640 mirror_start(bs, target_bs, 2641 has_replaces ? replaces : NULL, 2642 speed, granularity, buf_size, sync, 2643 on_source_error, on_target_error, 2644 block_job_cb, bs, &local_err); 2645 if (local_err != NULL) { 2646 bdrv_unref(target_bs); 2647 error_propagate(errp, local_err); 2648 goto out; 2649 } 2650 2651 out: 2652 aio_context_release(aio_context); 2653 } 2654 2655 /* Get the block job for a given device name and acquire its AioContext */ 2656 static BlockJob *find_block_job(const char *device, AioContext **aio_context) 2657 { 2658 BlockDriverState *bs; 2659 2660 bs = bdrv_find(device); 2661 if (!bs) { 2662 goto notfound; 2663 } 2664 2665 *aio_context = bdrv_get_aio_context(bs); 2666 aio_context_acquire(*aio_context); 2667 2668 if (!bs->job) { 2669 aio_context_release(*aio_context); 2670 goto notfound; 2671 } 2672 2673 return bs->job; 2674 2675 notfound: 2676 *aio_context = NULL; 2677 return NULL; 2678 } 2679 2680 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2681 { 2682 AioContext *aio_context; 2683 BlockJob *job = find_block_job(device, &aio_context); 2684 2685 if (!job) { 2686 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2687 return; 2688 } 2689 2690 block_job_set_speed(job, speed, errp); 2691 aio_context_release(aio_context); 2692 } 2693 2694 void qmp_block_job_cancel(const char *device, 2695 bool has_force, bool force, Error **errp) 2696 { 2697 AioContext *aio_context; 2698 BlockJob *job = find_block_job(device, &aio_context); 2699 2700 if (!job) { 2701 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2702 return; 2703 } 2704 2705 if (!has_force) { 2706 force = false; 2707 } 2708 2709 if (job->paused && !force) { 2710 error_setg(errp, "The block job for device '%s' is currently paused", 2711 device); 2712 goto out; 2713 } 2714 2715 trace_qmp_block_job_cancel(job); 2716 block_job_cancel(job); 2717 out: 2718 aio_context_release(aio_context); 2719 } 2720 2721 void qmp_block_job_pause(const char *device, Error **errp) 2722 { 2723 AioContext *aio_context; 2724 BlockJob *job = find_block_job(device, &aio_context); 2725 2726 if (!job) { 2727 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2728 return; 2729 } 2730 2731 trace_qmp_block_job_pause(job); 2732 block_job_pause(job); 2733 aio_context_release(aio_context); 2734 } 2735 2736 void qmp_block_job_resume(const char *device, Error **errp) 2737 { 2738 AioContext *aio_context; 2739 BlockJob *job = find_block_job(device, &aio_context); 2740 2741 if (!job) { 2742 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2743 return; 2744 } 2745 2746 trace_qmp_block_job_resume(job); 2747 block_job_resume(job); 2748 aio_context_release(aio_context); 2749 } 2750 2751 void qmp_block_job_complete(const char *device, Error **errp) 2752 { 2753 AioContext *aio_context; 2754 BlockJob *job = find_block_job(device, &aio_context); 2755 2756 if (!job) { 2757 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2758 return; 2759 } 2760 2761 trace_qmp_block_job_complete(job); 2762 block_job_complete(job, errp); 2763 aio_context_release(aio_context); 2764 } 2765 2766 void qmp_change_backing_file(const char *device, 2767 const char *image_node_name, 2768 const char *backing_file, 2769 Error **errp) 2770 { 2771 BlockDriverState *bs = NULL; 2772 AioContext *aio_context; 2773 BlockDriverState *image_bs = NULL; 2774 Error *local_err = NULL; 2775 bool ro; 2776 int open_flags; 2777 int ret; 2778 2779 /* find the top layer BDS of the chain */ 2780 bs = bdrv_find(device); 2781 if (!bs) { 2782 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2783 return; 2784 } 2785 2786 aio_context = bdrv_get_aio_context(bs); 2787 aio_context_acquire(aio_context); 2788 2789 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2790 if (local_err) { 2791 error_propagate(errp, local_err); 2792 goto out; 2793 } 2794 2795 if (!image_bs) { 2796 error_setg(errp, "image file not found"); 2797 goto out; 2798 } 2799 2800 if (bdrv_find_base(image_bs) == image_bs) { 2801 error_setg(errp, "not allowing backing file change on an image " 2802 "without a backing file"); 2803 goto out; 2804 } 2805 2806 /* even though we are not necessarily operating on bs, we need it to 2807 * determine if block ops are currently prohibited on the chain */ 2808 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 2809 goto out; 2810 } 2811 2812 /* final sanity check */ 2813 if (!bdrv_chain_contains(bs, image_bs)) { 2814 error_setg(errp, "'%s' and image file are not in the same chain", 2815 device); 2816 goto out; 2817 } 2818 2819 /* if not r/w, reopen to make r/w */ 2820 open_flags = image_bs->open_flags; 2821 ro = bdrv_is_read_only(image_bs); 2822 2823 if (ro) { 2824 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 2825 if (local_err) { 2826 error_propagate(errp, local_err); 2827 goto out; 2828 } 2829 } 2830 2831 ret = bdrv_change_backing_file(image_bs, backing_file, 2832 image_bs->drv ? image_bs->drv->format_name : ""); 2833 2834 if (ret < 0) { 2835 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 2836 backing_file); 2837 /* don't exit here, so we can try to restore open flags if 2838 * appropriate */ 2839 } 2840 2841 if (ro) { 2842 bdrv_reopen(image_bs, open_flags, &local_err); 2843 if (local_err) { 2844 error_propagate(errp, local_err); /* will preserve prior errp */ 2845 } 2846 } 2847 2848 out: 2849 aio_context_release(aio_context); 2850 } 2851 2852 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2853 { 2854 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2855 BlockBackend *blk; 2856 QObject *obj; 2857 QDict *qdict; 2858 Error *local_err = NULL; 2859 2860 /* Require an ID in the top level */ 2861 if (!options->has_id) { 2862 error_setg(errp, "Block device needs an ID"); 2863 goto fail; 2864 } 2865 2866 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 2867 * cache.direct=false instead of silently switching to aio=threads, except 2868 * when called from drive_new(). 2869 * 2870 * For now, simply forbidding the combination for all drivers will do. */ 2871 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2872 bool direct = options->has_cache && 2873 options->cache->has_direct && 2874 options->cache->direct; 2875 if (!direct) { 2876 error_setg(errp, "aio=native requires cache.direct=true"); 2877 goto fail; 2878 } 2879 } 2880 2881 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2882 &options, NULL, &local_err); 2883 if (local_err) { 2884 error_propagate(errp, local_err); 2885 goto fail; 2886 } 2887 2888 obj = qmp_output_get_qobject(ov); 2889 qdict = qobject_to_qdict(obj); 2890 2891 qdict_flatten(qdict); 2892 2893 blk = blockdev_init(NULL, qdict, &local_err); 2894 if (local_err) { 2895 error_propagate(errp, local_err); 2896 goto fail; 2897 } 2898 2899 if (bdrv_key_required(blk_bs(blk))) { 2900 blk_unref(blk); 2901 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 2902 goto fail; 2903 } 2904 2905 fail: 2906 qmp_output_visitor_cleanup(ov); 2907 } 2908 2909 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2910 { 2911 BlockJobInfoList *head = NULL, **p_next = &head; 2912 BlockDriverState *bs; 2913 2914 for (bs = bdrv_next(NULL); bs; bs = bdrv_next(bs)) { 2915 AioContext *aio_context = bdrv_get_aio_context(bs); 2916 2917 aio_context_acquire(aio_context); 2918 2919 if (bs->job) { 2920 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2921 elem->value = block_job_query(bs->job); 2922 *p_next = elem; 2923 p_next = &elem->next; 2924 } 2925 2926 aio_context_release(aio_context); 2927 } 2928 2929 return head; 2930 } 2931 2932 QemuOptsList qemu_common_drive_opts = { 2933 .name = "drive", 2934 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2935 .desc = { 2936 { 2937 .name = "snapshot", 2938 .type = QEMU_OPT_BOOL, 2939 .help = "enable/disable snapshot mode", 2940 },{ 2941 .name = "discard", 2942 .type = QEMU_OPT_STRING, 2943 .help = "discard operation (ignore/off, unmap/on)", 2944 },{ 2945 .name = "cache.writeback", 2946 .type = QEMU_OPT_BOOL, 2947 .help = "enables writeback mode for any caches", 2948 },{ 2949 .name = "cache.direct", 2950 .type = QEMU_OPT_BOOL, 2951 .help = "enables use of O_DIRECT (bypass the host page cache)", 2952 },{ 2953 .name = "cache.no-flush", 2954 .type = QEMU_OPT_BOOL, 2955 .help = "ignore any flush requests for the device", 2956 },{ 2957 .name = "aio", 2958 .type = QEMU_OPT_STRING, 2959 .help = "host AIO implementation (threads, native)", 2960 },{ 2961 .name = "format", 2962 .type = QEMU_OPT_STRING, 2963 .help = "disk format (raw, qcow2, ...)", 2964 },{ 2965 .name = "rerror", 2966 .type = QEMU_OPT_STRING, 2967 .help = "read error action", 2968 },{ 2969 .name = "werror", 2970 .type = QEMU_OPT_STRING, 2971 .help = "write error action", 2972 },{ 2973 .name = "read-only", 2974 .type = QEMU_OPT_BOOL, 2975 .help = "open drive file as read-only", 2976 },{ 2977 .name = "throttling.iops-total", 2978 .type = QEMU_OPT_NUMBER, 2979 .help = "limit total I/O operations per second", 2980 },{ 2981 .name = "throttling.iops-read", 2982 .type = QEMU_OPT_NUMBER, 2983 .help = "limit read operations per second", 2984 },{ 2985 .name = "throttling.iops-write", 2986 .type = QEMU_OPT_NUMBER, 2987 .help = "limit write operations per second", 2988 },{ 2989 .name = "throttling.bps-total", 2990 .type = QEMU_OPT_NUMBER, 2991 .help = "limit total bytes per second", 2992 },{ 2993 .name = "throttling.bps-read", 2994 .type = QEMU_OPT_NUMBER, 2995 .help = "limit read bytes per second", 2996 },{ 2997 .name = "throttling.bps-write", 2998 .type = QEMU_OPT_NUMBER, 2999 .help = "limit write bytes per second", 3000 },{ 3001 .name = "throttling.iops-total-max", 3002 .type = QEMU_OPT_NUMBER, 3003 .help = "I/O operations burst", 3004 },{ 3005 .name = "throttling.iops-read-max", 3006 .type = QEMU_OPT_NUMBER, 3007 .help = "I/O operations read burst", 3008 },{ 3009 .name = "throttling.iops-write-max", 3010 .type = QEMU_OPT_NUMBER, 3011 .help = "I/O operations write burst", 3012 },{ 3013 .name = "throttling.bps-total-max", 3014 .type = QEMU_OPT_NUMBER, 3015 .help = "total bytes burst", 3016 },{ 3017 .name = "throttling.bps-read-max", 3018 .type = QEMU_OPT_NUMBER, 3019 .help = "total bytes read burst", 3020 },{ 3021 .name = "throttling.bps-write-max", 3022 .type = QEMU_OPT_NUMBER, 3023 .help = "total bytes write burst", 3024 },{ 3025 .name = "throttling.iops-size", 3026 .type = QEMU_OPT_NUMBER, 3027 .help = "when limiting by iops max size of an I/O in bytes", 3028 },{ 3029 .name = "copy-on-read", 3030 .type = QEMU_OPT_BOOL, 3031 .help = "copy read data from backing file into image file", 3032 },{ 3033 .name = "detect-zeroes", 3034 .type = QEMU_OPT_STRING, 3035 .help = "try to optimize zero writes (off, on, unmap)", 3036 }, 3037 { /* end of list */ } 3038 }, 3039 }; 3040 3041 QemuOptsList qemu_drive_opts = { 3042 .name = "drive", 3043 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 3044 .desc = { 3045 /* 3046 * no elements => accept any params 3047 * validation will happen later 3048 */ 3049 { /* end of list */ } 3050 }, 3051 }; 3052