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