1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "sysemu/blockdev.h" 34 #include "hw/block/block.h" 35 #include "block/blockjob.h" 36 #include "monitor/monitor.h" 37 #include "qapi/qmp/qerror.h" 38 #include "qemu/option.h" 39 #include "qemu/config-file.h" 40 #include "qapi/qmp/types.h" 41 #include "qapi-visit.h" 42 #include "qapi/qmp-output-visitor.h" 43 #include "sysemu/sysemu.h" 44 #include "block/block_int.h" 45 #include "qmp-commands.h" 46 #include "trace.h" 47 #include "sysemu/arch_init.h" 48 49 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 50 51 static const char *const if_name[IF_COUNT] = { 52 [IF_NONE] = "none", 53 [IF_IDE] = "ide", 54 [IF_SCSI] = "scsi", 55 [IF_FLOPPY] = "floppy", 56 [IF_PFLASH] = "pflash", 57 [IF_MTD] = "mtd", 58 [IF_SD] = "sd", 59 [IF_VIRTIO] = "virtio", 60 [IF_XEN] = "xen", 61 }; 62 63 static const int if_max_devs[IF_COUNT] = { 64 /* 65 * Do not change these numbers! They govern how drive option 66 * index maps to unit and bus. That mapping is ABI. 67 * 68 * All controllers used to imlement if=T drives need to support 69 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 70 * Otherwise, some index values map to "impossible" bus, unit 71 * values. 72 * 73 * For instance, if you change [IF_SCSI] to 255, -drive 74 * if=scsi,index=12 no longer means bus=1,unit=5, but 75 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 76 * the drive can't be set up. Regression. 77 */ 78 [IF_IDE] = 2, 79 [IF_SCSI] = 7, 80 }; 81 82 /* 83 * We automatically delete the drive when a device using it gets 84 * unplugged. Questionable feature, but we can't just drop it. 85 * Device models call blockdev_mark_auto_del() to schedule the 86 * automatic deletion, and generic qdev code calls blockdev_auto_del() 87 * when deletion is actually safe. 88 */ 89 void blockdev_mark_auto_del(BlockDriverState *bs) 90 { 91 DriveInfo *dinfo = drive_get_by_blockdev(bs); 92 93 if (dinfo && !dinfo->enable_auto_del) { 94 return; 95 } 96 97 if (bs->job) { 98 block_job_cancel(bs->job); 99 } 100 if (dinfo) { 101 dinfo->auto_del = 1; 102 } 103 } 104 105 void blockdev_auto_del(BlockDriverState *bs) 106 { 107 DriveInfo *dinfo = drive_get_by_blockdev(bs); 108 109 if (dinfo && dinfo->auto_del) { 110 drive_put_ref(dinfo); 111 } 112 } 113 114 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 115 { 116 int max_devs = if_max_devs[type]; 117 return max_devs ? index / max_devs : 0; 118 } 119 120 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 121 { 122 int max_devs = if_max_devs[type]; 123 return max_devs ? index % max_devs : index; 124 } 125 126 QemuOpts *drive_def(const char *optstr) 127 { 128 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 129 } 130 131 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 132 const char *optstr) 133 { 134 QemuOpts *opts; 135 char buf[32]; 136 137 opts = drive_def(optstr); 138 if (!opts) { 139 return NULL; 140 } 141 if (type != IF_DEFAULT) { 142 qemu_opt_set(opts, "if", if_name[type]); 143 } 144 if (index >= 0) { 145 snprintf(buf, sizeof(buf), "%d", index); 146 qemu_opt_set(opts, "index", buf); 147 } 148 if (file) 149 qemu_opt_set(opts, "file", file); 150 return opts; 151 } 152 153 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 154 { 155 DriveInfo *dinfo; 156 157 /* seek interface, bus and unit */ 158 159 QTAILQ_FOREACH(dinfo, &drives, next) { 160 if (dinfo->type == type && 161 dinfo->bus == bus && 162 dinfo->unit == unit) 163 return dinfo; 164 } 165 166 return NULL; 167 } 168 169 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 170 { 171 return drive_get(type, 172 drive_index_to_bus_id(type, index), 173 drive_index_to_unit_id(type, index)); 174 } 175 176 int drive_get_max_bus(BlockInterfaceType type) 177 { 178 int max_bus; 179 DriveInfo *dinfo; 180 181 max_bus = -1; 182 QTAILQ_FOREACH(dinfo, &drives, next) { 183 if(dinfo->type == type && 184 dinfo->bus > max_bus) 185 max_bus = dinfo->bus; 186 } 187 return max_bus; 188 } 189 190 /* Get a block device. This should only be used for single-drive devices 191 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 192 appropriate bus. */ 193 DriveInfo *drive_get_next(BlockInterfaceType type) 194 { 195 static int next_block_unit[IF_COUNT]; 196 197 return drive_get(type, 0, next_block_unit[type]++); 198 } 199 200 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 201 { 202 DriveInfo *dinfo; 203 204 QTAILQ_FOREACH(dinfo, &drives, next) { 205 if (dinfo->bdrv == bs) { 206 return dinfo; 207 } 208 } 209 return NULL; 210 } 211 212 static void bdrv_format_print(void *opaque, const char *name) 213 { 214 error_printf(" %s", name); 215 } 216 217 static void drive_uninit(DriveInfo *dinfo) 218 { 219 if (dinfo->opts) { 220 qemu_opts_del(dinfo->opts); 221 } 222 223 bdrv_unref(dinfo->bdrv); 224 g_free(dinfo->id); 225 QTAILQ_REMOVE(&drives, dinfo, next); 226 g_free(dinfo->serial); 227 g_free(dinfo); 228 } 229 230 void drive_put_ref(DriveInfo *dinfo) 231 { 232 assert(dinfo->refcount); 233 if (--dinfo->refcount == 0) { 234 drive_uninit(dinfo); 235 } 236 } 237 238 void drive_get_ref(DriveInfo *dinfo) 239 { 240 dinfo->refcount++; 241 } 242 243 typedef struct { 244 QEMUBH *bh; 245 BlockDriverState *bs; 246 } BDRVPutRefBH; 247 248 static void bdrv_put_ref_bh(void *opaque) 249 { 250 BDRVPutRefBH *s = opaque; 251 252 bdrv_unref(s->bs); 253 qemu_bh_delete(s->bh); 254 g_free(s); 255 } 256 257 /* 258 * Release a BDS reference in a BH 259 * 260 * It is not safe to use bdrv_unref() from a callback function when the callers 261 * still need the BlockDriverState. In such cases we schedule a BH to release 262 * the reference. 263 */ 264 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 265 { 266 BDRVPutRefBH *s; 267 268 s = g_new(BDRVPutRefBH, 1); 269 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 270 s->bs = bs; 271 qemu_bh_schedule(s->bh); 272 } 273 274 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 275 { 276 if (!strcmp(buf, "ignore")) { 277 return BLOCKDEV_ON_ERROR_IGNORE; 278 } else if (!is_read && !strcmp(buf, "enospc")) { 279 return BLOCKDEV_ON_ERROR_ENOSPC; 280 } else if (!strcmp(buf, "stop")) { 281 return BLOCKDEV_ON_ERROR_STOP; 282 } else if (!strcmp(buf, "report")) { 283 return BLOCKDEV_ON_ERROR_REPORT; 284 } else { 285 error_setg(errp, "'%s' invalid %s error action", 286 buf, is_read ? "read" : "write"); 287 return -1; 288 } 289 } 290 291 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 292 { 293 if (throttle_conflicting(cfg)) { 294 error_setg(errp, "bps/iops/max total values and read/write values" 295 " cannot be used at the same time"); 296 return false; 297 } 298 299 if (!throttle_is_valid(cfg)) { 300 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 301 return false; 302 } 303 304 return true; 305 } 306 307 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 308 309 /* Takes the ownership of bs_opts */ 310 static DriveInfo *blockdev_init(QDict *bs_opts, 311 BlockInterfaceType type, 312 Error **errp) 313 { 314 const char *buf; 315 const char *file = NULL; 316 const char *serial; 317 int ro = 0; 318 int bdrv_flags = 0; 319 int on_read_error, on_write_error; 320 DriveInfo *dinfo; 321 ThrottleConfig cfg; 322 int snapshot = 0; 323 bool copy_on_read; 324 int ret; 325 Error *error = NULL; 326 QemuOpts *opts; 327 const char *id; 328 bool has_driver_specific_opts; 329 BlockDriver *drv = NULL; 330 331 /* Check common options by copying from bs_opts to opts, all other options 332 * stay in bs_opts for processing by bdrv_open(). */ 333 id = qdict_get_try_str(bs_opts, "id"); 334 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 335 if (error_is_set(&error)) { 336 error_propagate(errp, error); 337 return NULL; 338 } 339 340 qemu_opts_absorb_qdict(opts, bs_opts, &error); 341 if (error_is_set(&error)) { 342 error_propagate(errp, error); 343 goto early_err; 344 } 345 346 if (id) { 347 qdict_del(bs_opts, "id"); 348 } 349 350 has_driver_specific_opts = !!qdict_size(bs_opts); 351 352 /* extract parameters */ 353 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 354 ro = qemu_opt_get_bool(opts, "read-only", 0); 355 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 356 357 file = qemu_opt_get(opts, "file"); 358 serial = qemu_opt_get(opts, "serial"); 359 360 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 361 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 362 error_setg(errp, "invalid discard option"); 363 goto early_err; 364 } 365 } 366 367 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 368 bdrv_flags |= BDRV_O_CACHE_WB; 369 } 370 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 371 bdrv_flags |= BDRV_O_NOCACHE; 372 } 373 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 374 bdrv_flags |= BDRV_O_NO_FLUSH; 375 } 376 377 #ifdef CONFIG_LINUX_AIO 378 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 379 if (!strcmp(buf, "native")) { 380 bdrv_flags |= BDRV_O_NATIVE_AIO; 381 } else if (!strcmp(buf, "threads")) { 382 /* this is the default */ 383 } else { 384 error_setg(errp, "invalid aio option"); 385 goto early_err; 386 } 387 } 388 #endif 389 390 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 391 if (is_help_option(buf)) { 392 error_printf("Supported formats:"); 393 bdrv_iterate_format(bdrv_format_print, NULL); 394 error_printf("\n"); 395 goto early_err; 396 } 397 398 drv = bdrv_find_format(buf); 399 if (!drv) { 400 error_setg(errp, "'%s' invalid format", buf); 401 goto early_err; 402 } 403 } 404 405 /* disk I/O throttling */ 406 memset(&cfg, 0, sizeof(cfg)); 407 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 408 qemu_opt_get_number(opts, "throttling.bps-total", 0); 409 cfg.buckets[THROTTLE_BPS_READ].avg = 410 qemu_opt_get_number(opts, "throttling.bps-read", 0); 411 cfg.buckets[THROTTLE_BPS_WRITE].avg = 412 qemu_opt_get_number(opts, "throttling.bps-write", 0); 413 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 414 qemu_opt_get_number(opts, "throttling.iops-total", 0); 415 cfg.buckets[THROTTLE_OPS_READ].avg = 416 qemu_opt_get_number(opts, "throttling.iops-read", 0); 417 cfg.buckets[THROTTLE_OPS_WRITE].avg = 418 qemu_opt_get_number(opts, "throttling.iops-write", 0); 419 420 cfg.buckets[THROTTLE_BPS_TOTAL].max = 421 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 422 cfg.buckets[THROTTLE_BPS_READ].max = 423 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 424 cfg.buckets[THROTTLE_BPS_WRITE].max = 425 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 426 cfg.buckets[THROTTLE_OPS_TOTAL].max = 427 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 428 cfg.buckets[THROTTLE_OPS_READ].max = 429 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 430 cfg.buckets[THROTTLE_OPS_WRITE].max = 431 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 432 433 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 434 435 if (!check_throttle_config(&cfg, &error)) { 436 error_propagate(errp, error); 437 goto early_err; 438 } 439 440 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 441 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 442 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 443 error_setg(errp, "werror is not supported by this bus type"); 444 goto early_err; 445 } 446 447 on_write_error = parse_block_error_action(buf, 0, &error); 448 if (error_is_set(&error)) { 449 error_propagate(errp, error); 450 goto early_err; 451 } 452 } 453 454 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 455 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 456 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 457 error_report("rerror is not supported by this bus type"); 458 goto early_err; 459 } 460 461 on_read_error = parse_block_error_action(buf, 1, &error); 462 if (error_is_set(&error)) { 463 error_propagate(errp, error); 464 goto early_err; 465 } 466 } 467 468 /* init */ 469 dinfo = g_malloc0(sizeof(*dinfo)); 470 dinfo->id = g_strdup(qemu_opts_id(opts)); 471 dinfo->bdrv = bdrv_new(dinfo->id); 472 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 473 dinfo->bdrv->read_only = ro; 474 dinfo->type = type; 475 dinfo->refcount = 1; 476 if (serial != NULL) { 477 dinfo->serial = g_strdup(serial); 478 } 479 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 480 481 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 482 483 /* disk I/O throttling */ 484 if (throttle_enabled(&cfg)) { 485 bdrv_io_limits_enable(dinfo->bdrv); 486 bdrv_set_io_limits(dinfo->bdrv, &cfg); 487 } 488 489 if (!file || !*file) { 490 if (has_driver_specific_opts) { 491 file = NULL; 492 } else { 493 QDECREF(bs_opts); 494 qemu_opts_del(opts); 495 return dinfo; 496 } 497 } 498 if (snapshot) { 499 /* always use cache=unsafe with snapshot */ 500 bdrv_flags &= ~BDRV_O_CACHE_MASK; 501 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 502 } 503 504 if (copy_on_read) { 505 bdrv_flags |= BDRV_O_COPY_ON_READ; 506 } 507 508 if (runstate_check(RUN_STATE_INMIGRATE)) { 509 bdrv_flags |= BDRV_O_INCOMING; 510 } 511 512 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 513 514 QINCREF(bs_opts); 515 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error); 516 517 if (ret < 0) { 518 error_setg(errp, "could not open disk image %s: %s", 519 file ?: dinfo->id, error_get_pretty(error)); 520 error_free(error); 521 goto err; 522 } 523 524 if (bdrv_key_required(dinfo->bdrv)) 525 autostart = 0; 526 527 QDECREF(bs_opts); 528 qemu_opts_del(opts); 529 530 return dinfo; 531 532 err: 533 bdrv_unref(dinfo->bdrv); 534 g_free(dinfo->id); 535 QTAILQ_REMOVE(&drives, dinfo, next); 536 g_free(dinfo); 537 early_err: 538 QDECREF(bs_opts); 539 qemu_opts_del(opts); 540 return NULL; 541 } 542 543 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to) 544 { 545 const char *value; 546 547 value = qemu_opt_get(opts, from); 548 if (value) { 549 qemu_opt_set(opts, to, value); 550 qemu_opt_unset(opts, from); 551 } 552 } 553 554 QemuOptsList qemu_legacy_drive_opts = { 555 .name = "drive", 556 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 557 .desc = { 558 { 559 .name = "bus", 560 .type = QEMU_OPT_NUMBER, 561 .help = "bus number", 562 },{ 563 .name = "unit", 564 .type = QEMU_OPT_NUMBER, 565 .help = "unit number (i.e. lun for scsi)", 566 },{ 567 .name = "index", 568 .type = QEMU_OPT_NUMBER, 569 .help = "index number", 570 },{ 571 .name = "media", 572 .type = QEMU_OPT_STRING, 573 .help = "media type (disk, cdrom)", 574 },{ 575 .name = "if", 576 .type = QEMU_OPT_STRING, 577 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 578 },{ 579 .name = "cyls", 580 .type = QEMU_OPT_NUMBER, 581 .help = "number of cylinders (ide disk geometry)", 582 },{ 583 .name = "heads", 584 .type = QEMU_OPT_NUMBER, 585 .help = "number of heads (ide disk geometry)", 586 },{ 587 .name = "secs", 588 .type = QEMU_OPT_NUMBER, 589 .help = "number of sectors (ide disk geometry)", 590 },{ 591 .name = "trans", 592 .type = QEMU_OPT_STRING, 593 .help = "chs translation (auto, lba, none)", 594 },{ 595 .name = "boot", 596 .type = QEMU_OPT_BOOL, 597 .help = "(deprecated, ignored)", 598 },{ 599 .name = "addr", 600 .type = QEMU_OPT_STRING, 601 .help = "pci address (virtio only)", 602 }, 603 604 /* Options that are passed on, but have special semantics with -drive */ 605 { 606 .name = "read-only", 607 .type = QEMU_OPT_BOOL, 608 .help = "open drive file as read-only", 609 },{ 610 .name = "copy-on-read", 611 .type = QEMU_OPT_BOOL, 612 .help = "copy read data from backing file into image file", 613 }, 614 615 { /* end of list */ } 616 }, 617 }; 618 619 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type) 620 { 621 const char *value; 622 DriveInfo *dinfo = NULL; 623 QDict *bs_opts; 624 QemuOpts *legacy_opts; 625 DriveMediaType media = MEDIA_DISK; 626 BlockInterfaceType type; 627 int cyls, heads, secs, translation; 628 int max_devs, bus_id, unit_id, index; 629 const char *devaddr; 630 bool read_only = false; 631 bool copy_on_read; 632 Error *local_err = NULL; 633 634 /* Change legacy command line options into QMP ones */ 635 qemu_opt_rename(all_opts, "iops", "throttling.iops-total"); 636 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read"); 637 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write"); 638 639 qemu_opt_rename(all_opts, "bps", "throttling.bps-total"); 640 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read"); 641 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write"); 642 643 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max"); 644 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max"); 645 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max"); 646 647 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max"); 648 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max"); 649 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max"); 650 651 qemu_opt_rename(all_opts, 652 "iops_size", "throttling.iops-size"); 653 654 qemu_opt_rename(all_opts, "readonly", "read-only"); 655 656 value = qemu_opt_get(all_opts, "cache"); 657 if (value) { 658 int flags = 0; 659 660 if (bdrv_parse_cache_flags(value, &flags) != 0) { 661 error_report("invalid cache option"); 662 return NULL; 663 } 664 665 /* Specific options take precedence */ 666 if (!qemu_opt_get(all_opts, "cache.writeback")) { 667 qemu_opt_set_bool(all_opts, "cache.writeback", 668 !!(flags & BDRV_O_CACHE_WB)); 669 } 670 if (!qemu_opt_get(all_opts, "cache.direct")) { 671 qemu_opt_set_bool(all_opts, "cache.direct", 672 !!(flags & BDRV_O_NOCACHE)); 673 } 674 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 675 qemu_opt_set_bool(all_opts, "cache.no-flush", 676 !!(flags & BDRV_O_NO_FLUSH)); 677 } 678 qemu_opt_unset(all_opts, "cache"); 679 } 680 681 /* Get a QDict for processing the options */ 682 bs_opts = qdict_new(); 683 qemu_opts_to_qdict(all_opts, bs_opts); 684 685 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 686 &error_abort); 687 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 688 if (error_is_set(&local_err)) { 689 qerror_report_err(local_err); 690 error_free(local_err); 691 goto fail; 692 } 693 694 /* Deprecated option boot=[on|off] */ 695 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 696 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 697 "ignored. Future versions will reject this parameter. Please " 698 "update your scripts.\n"); 699 } 700 701 /* Media type */ 702 value = qemu_opt_get(legacy_opts, "media"); 703 if (value) { 704 if (!strcmp(value, "disk")) { 705 media = MEDIA_DISK; 706 } else if (!strcmp(value, "cdrom")) { 707 media = MEDIA_CDROM; 708 read_only = true; 709 } else { 710 error_report("'%s' invalid media", value); 711 goto fail; 712 } 713 } 714 715 /* copy-on-read is disabled with a warning for read-only devices */ 716 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 717 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 718 719 if (read_only && copy_on_read) { 720 error_report("warning: disabling copy-on-read on read-only drive"); 721 copy_on_read = false; 722 } 723 724 qdict_put(bs_opts, "read-only", 725 qstring_from_str(read_only ? "on" : "off")); 726 qdict_put(bs_opts, "copy-on-read", 727 qstring_from_str(copy_on_read ? "on" :"off")); 728 729 /* Controller type */ 730 value = qemu_opt_get(legacy_opts, "if"); 731 if (value) { 732 for (type = 0; 733 type < IF_COUNT && strcmp(value, if_name[type]); 734 type++) { 735 } 736 if (type == IF_COUNT) { 737 error_report("unsupported bus type '%s'", value); 738 goto fail; 739 } 740 } else { 741 type = block_default_type; 742 } 743 744 /* Geometry */ 745 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 746 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 747 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 748 749 if (cyls || heads || secs) { 750 if (cyls < 1) { 751 error_report("invalid physical cyls number"); 752 goto fail; 753 } 754 if (heads < 1) { 755 error_report("invalid physical heads number"); 756 goto fail; 757 } 758 if (secs < 1) { 759 error_report("invalid physical secs number"); 760 goto fail; 761 } 762 } 763 764 translation = BIOS_ATA_TRANSLATION_AUTO; 765 value = qemu_opt_get(legacy_opts, "trans"); 766 if (value != NULL) { 767 if (!cyls) { 768 error_report("'%s' trans must be used with cyls, heads and secs", 769 value); 770 goto fail; 771 } 772 if (!strcmp(value, "none")) { 773 translation = BIOS_ATA_TRANSLATION_NONE; 774 } else if (!strcmp(value, "lba")) { 775 translation = BIOS_ATA_TRANSLATION_LBA; 776 } else if (!strcmp(value, "auto")) { 777 translation = BIOS_ATA_TRANSLATION_AUTO; 778 } else { 779 error_report("'%s' invalid translation type", value); 780 goto fail; 781 } 782 } 783 784 if (media == MEDIA_CDROM) { 785 if (cyls || secs || heads) { 786 error_report("CHS can't be set with media=cdrom"); 787 goto fail; 788 } 789 } 790 791 /* Device address specified by bus/unit or index. 792 * If none was specified, try to find the first free one. */ 793 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 794 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 795 index = qemu_opt_get_number(legacy_opts, "index", -1); 796 797 max_devs = if_max_devs[type]; 798 799 if (index != -1) { 800 if (bus_id != 0 || unit_id != -1) { 801 error_report("index cannot be used with bus and unit"); 802 goto fail; 803 } 804 bus_id = drive_index_to_bus_id(type, index); 805 unit_id = drive_index_to_unit_id(type, index); 806 } 807 808 if (unit_id == -1) { 809 unit_id = 0; 810 while (drive_get(type, bus_id, unit_id) != NULL) { 811 unit_id++; 812 if (max_devs && unit_id >= max_devs) { 813 unit_id -= max_devs; 814 bus_id++; 815 } 816 } 817 } 818 819 if (max_devs && unit_id >= max_devs) { 820 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 821 goto fail; 822 } 823 824 if (drive_get(type, bus_id, unit_id) != NULL) { 825 error_report("drive with bus=%d, unit=%d (index=%d) exists", 826 bus_id, unit_id, index); 827 goto fail; 828 } 829 830 /* no id supplied -> create one */ 831 if (qemu_opts_id(all_opts) == NULL) { 832 char *new_id; 833 const char *mediastr = ""; 834 if (type == IF_IDE || type == IF_SCSI) { 835 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 836 } 837 if (max_devs) { 838 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 839 mediastr, unit_id); 840 } else { 841 new_id = g_strdup_printf("%s%s%i", if_name[type], 842 mediastr, unit_id); 843 } 844 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 845 g_free(new_id); 846 } 847 848 /* Add virtio block device */ 849 devaddr = qemu_opt_get(legacy_opts, "addr"); 850 if (devaddr && type != IF_VIRTIO) { 851 error_report("addr is not supported by this bus type"); 852 goto fail; 853 } 854 855 if (type == IF_VIRTIO) { 856 QemuOpts *devopts; 857 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 858 &error_abort); 859 if (arch_type == QEMU_ARCH_S390X) { 860 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 861 } else { 862 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 863 } 864 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 865 if (devaddr) { 866 qemu_opt_set(devopts, "addr", devaddr); 867 } 868 } 869 870 /* Actual block device init: Functionality shared with blockdev-add */ 871 dinfo = blockdev_init(bs_opts, type, &local_err); 872 if (dinfo == NULL) { 873 if (error_is_set(&local_err)) { 874 qerror_report_err(local_err); 875 error_free(local_err); 876 } 877 goto fail; 878 } else { 879 assert(!error_is_set(&local_err)); 880 } 881 882 /* Set legacy DriveInfo fields */ 883 dinfo->enable_auto_del = true; 884 dinfo->opts = all_opts; 885 886 dinfo->cyls = cyls; 887 dinfo->heads = heads; 888 dinfo->secs = secs; 889 dinfo->trans = translation; 890 891 dinfo->bus = bus_id; 892 dinfo->unit = unit_id; 893 dinfo->devaddr = devaddr; 894 895 switch(type) { 896 case IF_IDE: 897 case IF_SCSI: 898 case IF_XEN: 899 case IF_NONE: 900 dinfo->media_cd = media == MEDIA_CDROM; 901 break; 902 default: 903 break; 904 } 905 906 fail: 907 qemu_opts_del(legacy_opts); 908 return dinfo; 909 } 910 911 void do_commit(Monitor *mon, const QDict *qdict) 912 { 913 const char *device = qdict_get_str(qdict, "device"); 914 BlockDriverState *bs; 915 int ret; 916 917 if (!strcmp(device, "all")) { 918 ret = bdrv_commit_all(); 919 } else { 920 bs = bdrv_find(device); 921 if (!bs) { 922 monitor_printf(mon, "Device '%s' not found\n", device); 923 return; 924 } 925 ret = bdrv_commit(bs); 926 } 927 if (ret < 0) { 928 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 929 strerror(-ret)); 930 } 931 } 932 933 static void blockdev_do_action(int kind, void *data, Error **errp) 934 { 935 TransactionAction action; 936 TransactionActionList list; 937 938 action.kind = kind; 939 action.data = data; 940 list.value = &action; 941 list.next = NULL; 942 qmp_transaction(&list, errp); 943 } 944 945 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, 946 bool has_format, const char *format, 947 bool has_mode, enum NewImageMode mode, 948 Error **errp) 949 { 950 BlockdevSnapshot snapshot = { 951 .device = (char *) device, 952 .snapshot_file = (char *) snapshot_file, 953 .has_format = has_format, 954 .format = (char *) format, 955 .has_mode = has_mode, 956 .mode = mode, 957 }; 958 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 959 &snapshot, errp); 960 } 961 962 void qmp_blockdev_snapshot_internal_sync(const char *device, 963 const char *name, 964 Error **errp) 965 { 966 BlockdevSnapshotInternal snapshot = { 967 .device = (char *) device, 968 .name = (char *) name 969 }; 970 971 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 972 &snapshot, errp); 973 } 974 975 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 976 bool has_id, 977 const char *id, 978 bool has_name, 979 const char *name, 980 Error **errp) 981 { 982 BlockDriverState *bs = bdrv_find(device); 983 QEMUSnapshotInfo sn; 984 Error *local_err = NULL; 985 SnapshotInfo *info = NULL; 986 int ret; 987 988 if (!bs) { 989 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 990 return NULL; 991 } 992 993 if (!has_id) { 994 id = NULL; 995 } 996 997 if (!has_name) { 998 name = NULL; 999 } 1000 1001 if (!id && !name) { 1002 error_setg(errp, "Name or id must be provided"); 1003 return NULL; 1004 } 1005 1006 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1007 if (error_is_set(&local_err)) { 1008 error_propagate(errp, local_err); 1009 return NULL; 1010 } 1011 if (!ret) { 1012 error_setg(errp, 1013 "Snapshot with id '%s' and name '%s' does not exist on " 1014 "device '%s'", 1015 STR_OR_NULL(id), STR_OR_NULL(name), device); 1016 return NULL; 1017 } 1018 1019 bdrv_snapshot_delete(bs, id, name, &local_err); 1020 if (error_is_set(&local_err)) { 1021 error_propagate(errp, local_err); 1022 return NULL; 1023 } 1024 1025 info = g_malloc0(sizeof(SnapshotInfo)); 1026 info->id = g_strdup(sn.id_str); 1027 info->name = g_strdup(sn.name); 1028 info->date_nsec = sn.date_nsec; 1029 info->date_sec = sn.date_sec; 1030 info->vm_state_size = sn.vm_state_size; 1031 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1032 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1033 1034 return info; 1035 } 1036 1037 /* New and old BlockDriverState structs for group snapshots */ 1038 1039 typedef struct BlkTransactionState BlkTransactionState; 1040 1041 /* Only prepare() may fail. In a single transaction, only one of commit() or 1042 abort() will be called, clean() will always be called if it present. */ 1043 typedef struct BdrvActionOps { 1044 /* Size of state struct, in bytes. */ 1045 size_t instance_size; 1046 /* Prepare the work, must NOT be NULL. */ 1047 void (*prepare)(BlkTransactionState *common, Error **errp); 1048 /* Commit the changes, can be NULL. */ 1049 void (*commit)(BlkTransactionState *common); 1050 /* Abort the changes on fail, can be NULL. */ 1051 void (*abort)(BlkTransactionState *common); 1052 /* Clean up resource in the end, can be NULL. */ 1053 void (*clean)(BlkTransactionState *common); 1054 } BdrvActionOps; 1055 1056 /* 1057 * This structure must be arranged as first member in child type, assuming 1058 * that compiler will also arrange it to the same address with parent instance. 1059 * Later it will be used in free(). 1060 */ 1061 struct BlkTransactionState { 1062 TransactionAction *action; 1063 const BdrvActionOps *ops; 1064 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1065 }; 1066 1067 /* internal snapshot private data */ 1068 typedef struct InternalSnapshotState { 1069 BlkTransactionState common; 1070 BlockDriverState *bs; 1071 QEMUSnapshotInfo sn; 1072 } InternalSnapshotState; 1073 1074 static void internal_snapshot_prepare(BlkTransactionState *common, 1075 Error **errp) 1076 { 1077 const char *device; 1078 const char *name; 1079 BlockDriverState *bs; 1080 QEMUSnapshotInfo old_sn, *sn; 1081 bool ret; 1082 qemu_timeval tv; 1083 BlockdevSnapshotInternal *internal; 1084 InternalSnapshotState *state; 1085 int ret1; 1086 1087 g_assert(common->action->kind == 1088 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1089 internal = common->action->blockdev_snapshot_internal_sync; 1090 state = DO_UPCAST(InternalSnapshotState, common, common); 1091 1092 /* 1. parse input */ 1093 device = internal->device; 1094 name = internal->name; 1095 1096 /* 2. check for validation */ 1097 bs = bdrv_find(device); 1098 if (!bs) { 1099 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1100 return; 1101 } 1102 1103 if (!bdrv_is_inserted(bs)) { 1104 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1105 return; 1106 } 1107 1108 if (bdrv_is_read_only(bs)) { 1109 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1110 return; 1111 } 1112 1113 if (!bdrv_can_snapshot(bs)) { 1114 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1115 bs->drv->format_name, device, "internal snapshot"); 1116 return; 1117 } 1118 1119 if (!strlen(name)) { 1120 error_setg(errp, "Name is empty"); 1121 return; 1122 } 1123 1124 /* check whether a snapshot with name exist */ 1125 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp); 1126 if (error_is_set(errp)) { 1127 return; 1128 } else if (ret) { 1129 error_setg(errp, 1130 "Snapshot with name '%s' already exists on device '%s'", 1131 name, device); 1132 return; 1133 } 1134 1135 /* 3. take the snapshot */ 1136 sn = &state->sn; 1137 pstrcpy(sn->name, sizeof(sn->name), name); 1138 qemu_gettimeofday(&tv); 1139 sn->date_sec = tv.tv_sec; 1140 sn->date_nsec = tv.tv_usec * 1000; 1141 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1142 1143 ret1 = bdrv_snapshot_create(bs, sn); 1144 if (ret1 < 0) { 1145 error_setg_errno(errp, -ret1, 1146 "Failed to create snapshot '%s' on device '%s'", 1147 name, device); 1148 return; 1149 } 1150 1151 /* 4. succeed, mark a snapshot is created */ 1152 state->bs = bs; 1153 } 1154 1155 static void internal_snapshot_abort(BlkTransactionState *common) 1156 { 1157 InternalSnapshotState *state = 1158 DO_UPCAST(InternalSnapshotState, common, common); 1159 BlockDriverState *bs = state->bs; 1160 QEMUSnapshotInfo *sn = &state->sn; 1161 Error *local_error = NULL; 1162 1163 if (!bs) { 1164 return; 1165 } 1166 1167 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1168 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1169 "device '%s' in abort: %s", 1170 sn->id_str, 1171 sn->name, 1172 bdrv_get_device_name(bs), 1173 error_get_pretty(local_error)); 1174 error_free(local_error); 1175 } 1176 } 1177 1178 /* external snapshot private data */ 1179 typedef struct ExternalSnapshotState { 1180 BlkTransactionState common; 1181 BlockDriverState *old_bs; 1182 BlockDriverState *new_bs; 1183 } ExternalSnapshotState; 1184 1185 static void external_snapshot_prepare(BlkTransactionState *common, 1186 Error **errp) 1187 { 1188 BlockDriver *drv; 1189 int flags, ret; 1190 Error *local_err = NULL; 1191 const char *device; 1192 const char *new_image_file; 1193 const char *format = "qcow2"; 1194 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1195 ExternalSnapshotState *state = 1196 DO_UPCAST(ExternalSnapshotState, common, common); 1197 TransactionAction *action = common->action; 1198 1199 /* get parameters */ 1200 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1201 1202 device = action->blockdev_snapshot_sync->device; 1203 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1204 if (action->blockdev_snapshot_sync->has_format) { 1205 format = action->blockdev_snapshot_sync->format; 1206 } 1207 if (action->blockdev_snapshot_sync->has_mode) { 1208 mode = action->blockdev_snapshot_sync->mode; 1209 } 1210 1211 /* start processing */ 1212 drv = bdrv_find_format(format); 1213 if (!drv) { 1214 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1215 return; 1216 } 1217 1218 state->old_bs = bdrv_find(device); 1219 if (!state->old_bs) { 1220 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1221 return; 1222 } 1223 1224 if (!bdrv_is_inserted(state->old_bs)) { 1225 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1226 return; 1227 } 1228 1229 if (bdrv_in_use(state->old_bs)) { 1230 error_set(errp, QERR_DEVICE_IN_USE, device); 1231 return; 1232 } 1233 1234 if (!bdrv_is_read_only(state->old_bs)) { 1235 if (bdrv_flush(state->old_bs)) { 1236 error_set(errp, QERR_IO_ERROR); 1237 return; 1238 } 1239 } 1240 1241 if (bdrv_check_ext_snapshot(state->old_bs) != EXT_SNAPSHOT_ALLOWED) { 1242 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1243 return; 1244 } 1245 1246 flags = state->old_bs->open_flags; 1247 1248 /* create new image w/backing file */ 1249 if (mode != NEW_IMAGE_MODE_EXISTING) { 1250 bdrv_img_create(new_image_file, format, 1251 state->old_bs->filename, 1252 state->old_bs->drv->format_name, 1253 NULL, -1, flags, &local_err, false); 1254 if (error_is_set(&local_err)) { 1255 error_propagate(errp, local_err); 1256 return; 1257 } 1258 } 1259 1260 /* We will manually add the backing_hd field to the bs later */ 1261 state->new_bs = bdrv_new(""); 1262 /* TODO Inherit bs->options or only take explicit options with an 1263 * extended QMP command? */ 1264 ret = bdrv_open(state->new_bs, new_image_file, NULL, 1265 flags | BDRV_O_NO_BACKING, drv, &local_err); 1266 if (ret != 0) { 1267 error_propagate(errp, local_err); 1268 } 1269 } 1270 1271 static void external_snapshot_commit(BlkTransactionState *common) 1272 { 1273 ExternalSnapshotState *state = 1274 DO_UPCAST(ExternalSnapshotState, common, common); 1275 1276 /* This removes our old bs and adds the new bs */ 1277 bdrv_append(state->new_bs, state->old_bs); 1278 /* We don't need (or want) to use the transactional 1279 * bdrv_reopen_multiple() across all the entries at once, because we 1280 * don't want to abort all of them if one of them fails the reopen */ 1281 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1282 NULL); 1283 } 1284 1285 static void external_snapshot_abort(BlkTransactionState *common) 1286 { 1287 ExternalSnapshotState *state = 1288 DO_UPCAST(ExternalSnapshotState, common, common); 1289 if (state->new_bs) { 1290 bdrv_unref(state->new_bs); 1291 } 1292 } 1293 1294 typedef struct DriveBackupState { 1295 BlkTransactionState common; 1296 BlockDriverState *bs; 1297 BlockJob *job; 1298 } DriveBackupState; 1299 1300 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1301 { 1302 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1303 DriveBackup *backup; 1304 Error *local_err = NULL; 1305 1306 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1307 backup = common->action->drive_backup; 1308 1309 qmp_drive_backup(backup->device, backup->target, 1310 backup->has_format, backup->format, 1311 backup->sync, 1312 backup->has_mode, backup->mode, 1313 backup->has_speed, backup->speed, 1314 backup->has_on_source_error, backup->on_source_error, 1315 backup->has_on_target_error, backup->on_target_error, 1316 &local_err); 1317 if (error_is_set(&local_err)) { 1318 error_propagate(errp, local_err); 1319 state->bs = NULL; 1320 state->job = NULL; 1321 return; 1322 } 1323 1324 state->bs = bdrv_find(backup->device); 1325 state->job = state->bs->job; 1326 } 1327 1328 static void drive_backup_abort(BlkTransactionState *common) 1329 { 1330 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1331 BlockDriverState *bs = state->bs; 1332 1333 /* Only cancel if it's the job we started */ 1334 if (bs && bs->job && bs->job == state->job) { 1335 block_job_cancel_sync(bs->job); 1336 } 1337 } 1338 1339 static void abort_prepare(BlkTransactionState *common, Error **errp) 1340 { 1341 error_setg(errp, "Transaction aborted using Abort action"); 1342 } 1343 1344 static void abort_commit(BlkTransactionState *common) 1345 { 1346 g_assert_not_reached(); /* this action never succeeds */ 1347 } 1348 1349 static const BdrvActionOps actions[] = { 1350 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1351 .instance_size = sizeof(ExternalSnapshotState), 1352 .prepare = external_snapshot_prepare, 1353 .commit = external_snapshot_commit, 1354 .abort = external_snapshot_abort, 1355 }, 1356 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1357 .instance_size = sizeof(DriveBackupState), 1358 .prepare = drive_backup_prepare, 1359 .abort = drive_backup_abort, 1360 }, 1361 [TRANSACTION_ACTION_KIND_ABORT] = { 1362 .instance_size = sizeof(BlkTransactionState), 1363 .prepare = abort_prepare, 1364 .commit = abort_commit, 1365 }, 1366 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1367 .instance_size = sizeof(InternalSnapshotState), 1368 .prepare = internal_snapshot_prepare, 1369 .abort = internal_snapshot_abort, 1370 }, 1371 }; 1372 1373 /* 1374 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1375 * then we do not pivot any of the devices in the group, and abandon the 1376 * snapshots 1377 */ 1378 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1379 { 1380 TransactionActionList *dev_entry = dev_list; 1381 BlkTransactionState *state, *next; 1382 Error *local_err = NULL; 1383 1384 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1385 QSIMPLEQ_INIT(&snap_bdrv_states); 1386 1387 /* drain all i/o before any snapshots */ 1388 bdrv_drain_all(); 1389 1390 /* We don't do anything in this loop that commits us to the snapshot */ 1391 while (NULL != dev_entry) { 1392 TransactionAction *dev_info = NULL; 1393 const BdrvActionOps *ops; 1394 1395 dev_info = dev_entry->value; 1396 dev_entry = dev_entry->next; 1397 1398 assert(dev_info->kind < ARRAY_SIZE(actions)); 1399 1400 ops = &actions[dev_info->kind]; 1401 assert(ops->instance_size > 0); 1402 1403 state = g_malloc0(ops->instance_size); 1404 state->ops = ops; 1405 state->action = dev_info; 1406 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1407 1408 state->ops->prepare(state, &local_err); 1409 if (error_is_set(&local_err)) { 1410 error_propagate(errp, local_err); 1411 goto delete_and_fail; 1412 } 1413 } 1414 1415 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1416 if (state->ops->commit) { 1417 state->ops->commit(state); 1418 } 1419 } 1420 1421 /* success */ 1422 goto exit; 1423 1424 delete_and_fail: 1425 /* 1426 * failure, and it is all-or-none; abandon each new bs, and keep using 1427 * the original bs for all images 1428 */ 1429 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1430 if (state->ops->abort) { 1431 state->ops->abort(state); 1432 } 1433 } 1434 exit: 1435 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1436 if (state->ops->clean) { 1437 state->ops->clean(state); 1438 } 1439 g_free(state); 1440 } 1441 } 1442 1443 1444 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1445 { 1446 if (bdrv_in_use(bs)) { 1447 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1448 return; 1449 } 1450 if (!bdrv_dev_has_removable_media(bs)) { 1451 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 1452 return; 1453 } 1454 1455 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1456 bdrv_dev_eject_request(bs, force); 1457 if (!force) { 1458 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 1459 return; 1460 } 1461 } 1462 1463 bdrv_close(bs); 1464 } 1465 1466 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1467 { 1468 BlockDriverState *bs; 1469 1470 bs = bdrv_find(device); 1471 if (!bs) { 1472 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1473 return; 1474 } 1475 1476 eject_device(bs, force, errp); 1477 } 1478 1479 void qmp_block_passwd(const char *device, const char *password, Error **errp) 1480 { 1481 BlockDriverState *bs; 1482 int err; 1483 1484 bs = bdrv_find(device); 1485 if (!bs) { 1486 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1487 return; 1488 } 1489 1490 err = bdrv_set_key(bs, password); 1491 if (err == -EINVAL) { 1492 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1493 return; 1494 } else if (err < 0) { 1495 error_set(errp, QERR_INVALID_PASSWORD); 1496 return; 1497 } 1498 } 1499 1500 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1501 int bdrv_flags, BlockDriver *drv, 1502 const char *password, Error **errp) 1503 { 1504 Error *local_err = NULL; 1505 int ret; 1506 1507 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err); 1508 if (ret < 0) { 1509 error_propagate(errp, local_err); 1510 return; 1511 } 1512 1513 if (bdrv_key_required(bs)) { 1514 if (password) { 1515 if (bdrv_set_key(bs, password) < 0) { 1516 error_set(errp, QERR_INVALID_PASSWORD); 1517 } 1518 } else { 1519 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1520 bdrv_get_encrypted_filename(bs)); 1521 } 1522 } else if (password) { 1523 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1524 } 1525 } 1526 1527 void qmp_change_blockdev(const char *device, const char *filename, 1528 const char *format, Error **errp) 1529 { 1530 BlockDriverState *bs; 1531 BlockDriver *drv = NULL; 1532 int bdrv_flags; 1533 Error *err = NULL; 1534 1535 bs = bdrv_find(device); 1536 if (!bs) { 1537 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1538 return; 1539 } 1540 1541 if (format) { 1542 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1543 if (!drv) { 1544 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1545 return; 1546 } 1547 } 1548 1549 eject_device(bs, 0, &err); 1550 if (error_is_set(&err)) { 1551 error_propagate(errp, err); 1552 return; 1553 } 1554 1555 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1556 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1557 1558 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1559 } 1560 1561 /* throttling disk I/O limits */ 1562 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1563 int64_t bps_wr, 1564 int64_t iops, 1565 int64_t iops_rd, 1566 int64_t iops_wr, 1567 bool has_bps_max, 1568 int64_t bps_max, 1569 bool has_bps_rd_max, 1570 int64_t bps_rd_max, 1571 bool has_bps_wr_max, 1572 int64_t bps_wr_max, 1573 bool has_iops_max, 1574 int64_t iops_max, 1575 bool has_iops_rd_max, 1576 int64_t iops_rd_max, 1577 bool has_iops_wr_max, 1578 int64_t iops_wr_max, 1579 bool has_iops_size, 1580 int64_t iops_size, Error **errp) 1581 { 1582 ThrottleConfig cfg; 1583 BlockDriverState *bs; 1584 1585 bs = bdrv_find(device); 1586 if (!bs) { 1587 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1588 return; 1589 } 1590 1591 memset(&cfg, 0, sizeof(cfg)); 1592 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1593 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1594 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1595 1596 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1597 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1598 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1599 1600 if (has_bps_max) { 1601 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1602 } 1603 if (has_bps_rd_max) { 1604 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1605 } 1606 if (has_bps_wr_max) { 1607 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1608 } 1609 if (has_iops_max) { 1610 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1611 } 1612 if (has_iops_rd_max) { 1613 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1614 } 1615 if (has_iops_wr_max) { 1616 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1617 } 1618 1619 if (has_iops_size) { 1620 cfg.op_size = iops_size; 1621 } 1622 1623 if (!check_throttle_config(&cfg, errp)) { 1624 return; 1625 } 1626 1627 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1628 bdrv_io_limits_enable(bs); 1629 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1630 bdrv_io_limits_disable(bs); 1631 } 1632 1633 if (bs->io_limits_enabled) { 1634 bdrv_set_io_limits(bs, &cfg); 1635 } 1636 } 1637 1638 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1639 { 1640 const char *id = qdict_get_str(qdict, "id"); 1641 BlockDriverState *bs; 1642 1643 bs = bdrv_find(id); 1644 if (!bs) { 1645 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1646 return -1; 1647 } 1648 if (bdrv_in_use(bs)) { 1649 qerror_report(QERR_DEVICE_IN_USE, id); 1650 return -1; 1651 } 1652 1653 /* quiesce block driver; prevent further io */ 1654 bdrv_drain_all(); 1655 bdrv_flush(bs); 1656 bdrv_close(bs); 1657 1658 /* if we have a device attached to this BlockDriverState 1659 * then we need to make the drive anonymous until the device 1660 * can be removed. If this is a drive with no device backing 1661 * then we can just get rid of the block driver state right here. 1662 */ 1663 if (bdrv_get_attached_dev(bs)) { 1664 bdrv_make_anon(bs); 1665 1666 /* Further I/O must not pause the guest */ 1667 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1668 BLOCKDEV_ON_ERROR_REPORT); 1669 } else { 1670 drive_uninit(drive_get_by_blockdev(bs)); 1671 } 1672 1673 return 0; 1674 } 1675 1676 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1677 { 1678 BlockDriverState *bs; 1679 int ret; 1680 1681 bs = bdrv_find(device); 1682 if (!bs) { 1683 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1684 return; 1685 } 1686 1687 if (size < 0) { 1688 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1689 return; 1690 } 1691 1692 /* complete all in-flight operations before resizing the device */ 1693 bdrv_drain_all(); 1694 1695 ret = bdrv_truncate(bs, size); 1696 switch (ret) { 1697 case 0: 1698 break; 1699 case -ENOMEDIUM: 1700 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1701 break; 1702 case -ENOTSUP: 1703 error_set(errp, QERR_UNSUPPORTED); 1704 break; 1705 case -EACCES: 1706 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1707 break; 1708 case -EBUSY: 1709 error_set(errp, QERR_DEVICE_IN_USE, device); 1710 break; 1711 default: 1712 error_setg_errno(errp, -ret, "Could not resize"); 1713 break; 1714 } 1715 } 1716 1717 static void block_job_cb(void *opaque, int ret) 1718 { 1719 BlockDriverState *bs = opaque; 1720 QObject *obj; 1721 1722 trace_block_job_cb(bs, bs->job, ret); 1723 1724 assert(bs->job); 1725 obj = qobject_from_block_job(bs->job); 1726 if (ret < 0) { 1727 QDict *dict = qobject_to_qdict(obj); 1728 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1729 } 1730 1731 if (block_job_is_cancelled(bs->job)) { 1732 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1733 } else { 1734 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1735 } 1736 qobject_decref(obj); 1737 1738 bdrv_put_ref_bh_schedule(bs); 1739 } 1740 1741 void qmp_block_stream(const char *device, bool has_base, 1742 const char *base, bool has_speed, int64_t speed, 1743 bool has_on_error, BlockdevOnError on_error, 1744 Error **errp) 1745 { 1746 BlockDriverState *bs; 1747 BlockDriverState *base_bs = NULL; 1748 Error *local_err = NULL; 1749 1750 if (!has_on_error) { 1751 on_error = BLOCKDEV_ON_ERROR_REPORT; 1752 } 1753 1754 bs = bdrv_find(device); 1755 if (!bs) { 1756 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1757 return; 1758 } 1759 1760 if (base) { 1761 base_bs = bdrv_find_backing_image(bs, base); 1762 if (base_bs == NULL) { 1763 error_set(errp, QERR_BASE_NOT_FOUND, base); 1764 return; 1765 } 1766 } 1767 1768 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1769 on_error, block_job_cb, bs, &local_err); 1770 if (error_is_set(&local_err)) { 1771 error_propagate(errp, local_err); 1772 return; 1773 } 1774 1775 trace_qmp_block_stream(bs, bs->job); 1776 } 1777 1778 void qmp_block_commit(const char *device, 1779 bool has_base, const char *base, const char *top, 1780 bool has_speed, int64_t speed, 1781 Error **errp) 1782 { 1783 BlockDriverState *bs; 1784 BlockDriverState *base_bs, *top_bs; 1785 Error *local_err = NULL; 1786 /* This will be part of the QMP command, if/when the 1787 * BlockdevOnError change for blkmirror makes it in 1788 */ 1789 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1790 1791 /* drain all i/o before commits */ 1792 bdrv_drain_all(); 1793 1794 bs = bdrv_find(device); 1795 if (!bs) { 1796 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1797 return; 1798 } 1799 1800 /* default top_bs is the active layer */ 1801 top_bs = bs; 1802 1803 if (top) { 1804 if (strcmp(bs->filename, top) != 0) { 1805 top_bs = bdrv_find_backing_image(bs, top); 1806 } 1807 } 1808 1809 if (top_bs == NULL) { 1810 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1811 return; 1812 } 1813 1814 if (has_base && base) { 1815 base_bs = bdrv_find_backing_image(top_bs, base); 1816 } else { 1817 base_bs = bdrv_find_base(top_bs); 1818 } 1819 1820 if (base_bs == NULL) { 1821 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1822 return; 1823 } 1824 1825 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1826 &local_err); 1827 if (local_err != NULL) { 1828 error_propagate(errp, local_err); 1829 return; 1830 } 1831 } 1832 1833 void qmp_drive_backup(const char *device, const char *target, 1834 bool has_format, const char *format, 1835 enum MirrorSyncMode sync, 1836 bool has_mode, enum NewImageMode mode, 1837 bool has_speed, int64_t speed, 1838 bool has_on_source_error, BlockdevOnError on_source_error, 1839 bool has_on_target_error, BlockdevOnError on_target_error, 1840 Error **errp) 1841 { 1842 BlockDriverState *bs; 1843 BlockDriverState *target_bs; 1844 BlockDriverState *source = NULL; 1845 BlockDriver *drv = NULL; 1846 Error *local_err = NULL; 1847 int flags; 1848 int64_t size; 1849 int ret; 1850 1851 if (!has_speed) { 1852 speed = 0; 1853 } 1854 if (!has_on_source_error) { 1855 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1856 } 1857 if (!has_on_target_error) { 1858 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1859 } 1860 if (!has_mode) { 1861 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1862 } 1863 1864 bs = bdrv_find(device); 1865 if (!bs) { 1866 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1867 return; 1868 } 1869 1870 if (!bdrv_is_inserted(bs)) { 1871 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1872 return; 1873 } 1874 1875 if (!has_format) { 1876 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1877 } 1878 if (format) { 1879 drv = bdrv_find_format(format); 1880 if (!drv) { 1881 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1882 return; 1883 } 1884 } 1885 1886 if (bdrv_in_use(bs)) { 1887 error_set(errp, QERR_DEVICE_IN_USE, device); 1888 return; 1889 } 1890 1891 flags = bs->open_flags | BDRV_O_RDWR; 1892 1893 /* See if we have a backing HD we can use to create our new image 1894 * on top of. */ 1895 if (sync == MIRROR_SYNC_MODE_TOP) { 1896 source = bs->backing_hd; 1897 if (!source) { 1898 sync = MIRROR_SYNC_MODE_FULL; 1899 } 1900 } 1901 if (sync == MIRROR_SYNC_MODE_NONE) { 1902 source = bs; 1903 } 1904 1905 size = bdrv_getlength(bs); 1906 if (size < 0) { 1907 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1908 return; 1909 } 1910 1911 if (mode != NEW_IMAGE_MODE_EXISTING) { 1912 assert(format && drv); 1913 if (source) { 1914 bdrv_img_create(target, format, source->filename, 1915 source->drv->format_name, NULL, 1916 size, flags, &local_err, false); 1917 } else { 1918 bdrv_img_create(target, format, NULL, NULL, NULL, 1919 size, flags, &local_err, false); 1920 } 1921 } 1922 1923 if (error_is_set(&local_err)) { 1924 error_propagate(errp, local_err); 1925 return; 1926 } 1927 1928 target_bs = bdrv_new(""); 1929 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err); 1930 if (ret < 0) { 1931 bdrv_unref(target_bs); 1932 error_propagate(errp, local_err); 1933 return; 1934 } 1935 1936 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 1937 block_job_cb, bs, &local_err); 1938 if (local_err != NULL) { 1939 bdrv_unref(target_bs); 1940 error_propagate(errp, local_err); 1941 return; 1942 } 1943 } 1944 1945 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 1946 1947 void qmp_drive_mirror(const char *device, const char *target, 1948 bool has_format, const char *format, 1949 enum MirrorSyncMode sync, 1950 bool has_mode, enum NewImageMode mode, 1951 bool has_speed, int64_t speed, 1952 bool has_granularity, uint32_t granularity, 1953 bool has_buf_size, int64_t buf_size, 1954 bool has_on_source_error, BlockdevOnError on_source_error, 1955 bool has_on_target_error, BlockdevOnError on_target_error, 1956 Error **errp) 1957 { 1958 BlockDriverState *bs; 1959 BlockDriverState *source, *target_bs; 1960 BlockDriver *drv = NULL; 1961 Error *local_err = NULL; 1962 int flags; 1963 int64_t size; 1964 int ret; 1965 1966 if (!has_speed) { 1967 speed = 0; 1968 } 1969 if (!has_on_source_error) { 1970 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1971 } 1972 if (!has_on_target_error) { 1973 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1974 } 1975 if (!has_mode) { 1976 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1977 } 1978 if (!has_granularity) { 1979 granularity = 0; 1980 } 1981 if (!has_buf_size) { 1982 buf_size = DEFAULT_MIRROR_BUF_SIZE; 1983 } 1984 1985 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 1986 error_set(errp, QERR_INVALID_PARAMETER, device); 1987 return; 1988 } 1989 if (granularity & (granularity - 1)) { 1990 error_set(errp, QERR_INVALID_PARAMETER, device); 1991 return; 1992 } 1993 1994 bs = bdrv_find(device); 1995 if (!bs) { 1996 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1997 return; 1998 } 1999 2000 if (!bdrv_is_inserted(bs)) { 2001 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2002 return; 2003 } 2004 2005 if (!has_format) { 2006 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2007 } 2008 if (format) { 2009 drv = bdrv_find_format(format); 2010 if (!drv) { 2011 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2012 return; 2013 } 2014 } 2015 2016 if (bdrv_in_use(bs)) { 2017 error_set(errp, QERR_DEVICE_IN_USE, device); 2018 return; 2019 } 2020 2021 flags = bs->open_flags | BDRV_O_RDWR; 2022 source = bs->backing_hd; 2023 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2024 sync = MIRROR_SYNC_MODE_FULL; 2025 } 2026 if (sync == MIRROR_SYNC_MODE_NONE) { 2027 source = bs; 2028 } 2029 2030 size = bdrv_getlength(bs); 2031 if (size < 0) { 2032 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2033 return; 2034 } 2035 2036 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2037 && mode != NEW_IMAGE_MODE_EXISTING) 2038 { 2039 /* create new image w/o backing file */ 2040 assert(format && drv); 2041 bdrv_img_create(target, format, 2042 NULL, NULL, NULL, size, flags, &local_err, false); 2043 } else { 2044 switch (mode) { 2045 case NEW_IMAGE_MODE_EXISTING: 2046 break; 2047 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2048 /* create new image with backing file */ 2049 bdrv_img_create(target, format, 2050 source->filename, 2051 source->drv->format_name, 2052 NULL, size, flags, &local_err, false); 2053 break; 2054 default: 2055 abort(); 2056 } 2057 } 2058 2059 if (error_is_set(&local_err)) { 2060 error_propagate(errp, local_err); 2061 return; 2062 } 2063 2064 /* Mirroring takes care of copy-on-write using the source's backing 2065 * file. 2066 */ 2067 target_bs = bdrv_new(""); 2068 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv, 2069 &local_err); 2070 if (ret < 0) { 2071 bdrv_unref(target_bs); 2072 error_propagate(errp, local_err); 2073 return; 2074 } 2075 2076 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 2077 on_source_error, on_target_error, 2078 block_job_cb, bs, &local_err); 2079 if (local_err != NULL) { 2080 bdrv_unref(target_bs); 2081 error_propagate(errp, local_err); 2082 return; 2083 } 2084 } 2085 2086 static BlockJob *find_block_job(const char *device) 2087 { 2088 BlockDriverState *bs; 2089 2090 bs = bdrv_find(device); 2091 if (!bs || !bs->job) { 2092 return NULL; 2093 } 2094 return bs->job; 2095 } 2096 2097 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2098 { 2099 BlockJob *job = find_block_job(device); 2100 2101 if (!job) { 2102 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2103 return; 2104 } 2105 2106 block_job_set_speed(job, speed, errp); 2107 } 2108 2109 void qmp_block_job_cancel(const char *device, 2110 bool has_force, bool force, Error **errp) 2111 { 2112 BlockJob *job = find_block_job(device); 2113 2114 if (!has_force) { 2115 force = false; 2116 } 2117 2118 if (!job) { 2119 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2120 return; 2121 } 2122 if (job->paused && !force) { 2123 error_set(errp, QERR_BLOCK_JOB_PAUSED, device); 2124 return; 2125 } 2126 2127 trace_qmp_block_job_cancel(job); 2128 block_job_cancel(job); 2129 } 2130 2131 void qmp_block_job_pause(const char *device, Error **errp) 2132 { 2133 BlockJob *job = find_block_job(device); 2134 2135 if (!job) { 2136 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2137 return; 2138 } 2139 2140 trace_qmp_block_job_pause(job); 2141 block_job_pause(job); 2142 } 2143 2144 void qmp_block_job_resume(const char *device, Error **errp) 2145 { 2146 BlockJob *job = find_block_job(device); 2147 2148 if (!job) { 2149 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2150 return; 2151 } 2152 2153 trace_qmp_block_job_resume(job); 2154 block_job_resume(job); 2155 } 2156 2157 void qmp_block_job_complete(const char *device, Error **errp) 2158 { 2159 BlockJob *job = find_block_job(device); 2160 2161 if (!job) { 2162 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2163 return; 2164 } 2165 2166 trace_qmp_block_job_complete(job); 2167 block_job_complete(job, errp); 2168 } 2169 2170 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2171 { 2172 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2173 QObject *obj; 2174 QDict *qdict; 2175 Error *local_err = NULL; 2176 2177 /* Require an ID in the top level */ 2178 if (!options->has_id) { 2179 error_setg(errp, "Block device needs an ID"); 2180 goto fail; 2181 } 2182 2183 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with 2184 * cache.direct=false instead of silently switching to aio=threads, except 2185 * if called from drive_init. 2186 * 2187 * For now, simply forbidding the combination for all drivers will do. */ 2188 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2189 bool direct = options->cache->has_direct && options->cache->direct; 2190 if (!options->has_cache && !direct) { 2191 error_setg(errp, "aio=native requires cache.direct=true"); 2192 goto fail; 2193 } 2194 } 2195 2196 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2197 &options, NULL, &local_err); 2198 if (error_is_set(&local_err)) { 2199 error_propagate(errp, local_err); 2200 goto fail; 2201 } 2202 2203 obj = qmp_output_get_qobject(ov); 2204 qdict = qobject_to_qdict(obj); 2205 2206 qdict_flatten(qdict); 2207 2208 blockdev_init(qdict, IF_NONE, &local_err); 2209 if (error_is_set(&local_err)) { 2210 error_propagate(errp, local_err); 2211 goto fail; 2212 } 2213 2214 fail: 2215 qmp_output_visitor_cleanup(ov); 2216 } 2217 2218 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 2219 { 2220 BlockJobInfoList **prev = opaque; 2221 BlockJob *job = bs->job; 2222 2223 if (job) { 2224 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2225 elem->value = block_job_query(bs->job); 2226 (*prev)->next = elem; 2227 *prev = elem; 2228 } 2229 } 2230 2231 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2232 { 2233 /* Dummy is a fake list element for holding the head pointer */ 2234 BlockJobInfoList dummy = {}; 2235 BlockJobInfoList *prev = &dummy; 2236 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 2237 return dummy.next; 2238 } 2239 2240 QemuOptsList qemu_common_drive_opts = { 2241 .name = "drive", 2242 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2243 .desc = { 2244 { 2245 .name = "snapshot", 2246 .type = QEMU_OPT_BOOL, 2247 .help = "enable/disable snapshot mode", 2248 },{ 2249 .name = "file", 2250 .type = QEMU_OPT_STRING, 2251 .help = "disk image", 2252 },{ 2253 .name = "discard", 2254 .type = QEMU_OPT_STRING, 2255 .help = "discard operation (ignore/off, unmap/on)", 2256 },{ 2257 .name = "cache.writeback", 2258 .type = QEMU_OPT_BOOL, 2259 .help = "enables writeback mode for any caches", 2260 },{ 2261 .name = "cache.direct", 2262 .type = QEMU_OPT_BOOL, 2263 .help = "enables use of O_DIRECT (bypass the host page cache)", 2264 },{ 2265 .name = "cache.no-flush", 2266 .type = QEMU_OPT_BOOL, 2267 .help = "ignore any flush requests for the device", 2268 },{ 2269 .name = "aio", 2270 .type = QEMU_OPT_STRING, 2271 .help = "host AIO implementation (threads, native)", 2272 },{ 2273 .name = "format", 2274 .type = QEMU_OPT_STRING, 2275 .help = "disk format (raw, qcow2, ...)", 2276 },{ 2277 .name = "serial", 2278 .type = QEMU_OPT_STRING, 2279 .help = "disk serial number", 2280 },{ 2281 .name = "rerror", 2282 .type = QEMU_OPT_STRING, 2283 .help = "read error action", 2284 },{ 2285 .name = "werror", 2286 .type = QEMU_OPT_STRING, 2287 .help = "write error action", 2288 },{ 2289 .name = "read-only", 2290 .type = QEMU_OPT_BOOL, 2291 .help = "open drive file as read-only", 2292 },{ 2293 .name = "throttling.iops-total", 2294 .type = QEMU_OPT_NUMBER, 2295 .help = "limit total I/O operations per second", 2296 },{ 2297 .name = "throttling.iops-read", 2298 .type = QEMU_OPT_NUMBER, 2299 .help = "limit read operations per second", 2300 },{ 2301 .name = "throttling.iops-write", 2302 .type = QEMU_OPT_NUMBER, 2303 .help = "limit write operations per second", 2304 },{ 2305 .name = "throttling.bps-total", 2306 .type = QEMU_OPT_NUMBER, 2307 .help = "limit total bytes per second", 2308 },{ 2309 .name = "throttling.bps-read", 2310 .type = QEMU_OPT_NUMBER, 2311 .help = "limit read bytes per second", 2312 },{ 2313 .name = "throttling.bps-write", 2314 .type = QEMU_OPT_NUMBER, 2315 .help = "limit write bytes per second", 2316 },{ 2317 .name = "throttling.iops-total-max", 2318 .type = QEMU_OPT_NUMBER, 2319 .help = "I/O operations burst", 2320 },{ 2321 .name = "throttling.iops-read-max", 2322 .type = QEMU_OPT_NUMBER, 2323 .help = "I/O operations read burst", 2324 },{ 2325 .name = "throttling.iops-write-max", 2326 .type = QEMU_OPT_NUMBER, 2327 .help = "I/O operations write burst", 2328 },{ 2329 .name = "throttling.bps-total-max", 2330 .type = QEMU_OPT_NUMBER, 2331 .help = "total bytes burst", 2332 },{ 2333 .name = "throttling.bps-read-max", 2334 .type = QEMU_OPT_NUMBER, 2335 .help = "total bytes read burst", 2336 },{ 2337 .name = "throttling.bps-write-max", 2338 .type = QEMU_OPT_NUMBER, 2339 .help = "total bytes write burst", 2340 },{ 2341 .name = "throttling.iops-size", 2342 .type = QEMU_OPT_NUMBER, 2343 .help = "when limiting by iops max size of an I/O in bytes", 2344 },{ 2345 .name = "copy-on-read", 2346 .type = QEMU_OPT_BOOL, 2347 .help = "copy read data from backing file into image file", 2348 }, 2349 { /* end of list */ } 2350 }, 2351 }; 2352 2353 QemuOptsList qemu_drive_opts = { 2354 .name = "drive", 2355 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2356 .desc = { 2357 /* 2358 * no elements => accept any params 2359 * validation will happen later 2360 */ 2361 { /* end of list */ } 2362 }, 2363 }; 2364