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_nofail(&qemu_legacy_drive_opts); 686 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 687 if (error_is_set(&local_err)) { 688 qerror_report_err(local_err); 689 error_free(local_err); 690 goto fail; 691 } 692 693 /* Deprecated option boot=[on|off] */ 694 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 695 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 696 "ignored. Future versions will reject this parameter. Please " 697 "update your scripts.\n"); 698 } 699 700 /* Media type */ 701 value = qemu_opt_get(legacy_opts, "media"); 702 if (value) { 703 if (!strcmp(value, "disk")) { 704 media = MEDIA_DISK; 705 } else if (!strcmp(value, "cdrom")) { 706 media = MEDIA_CDROM; 707 read_only = true; 708 } else { 709 error_report("'%s' invalid media", value); 710 goto fail; 711 } 712 } 713 714 /* copy-on-read is disabled with a warning for read-only devices */ 715 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 716 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 717 718 if (read_only && copy_on_read) { 719 error_report("warning: disabling copy-on-read on read-only drive"); 720 copy_on_read = false; 721 } 722 723 qdict_put(bs_opts, "read-only", 724 qstring_from_str(read_only ? "on" : "off")); 725 qdict_put(bs_opts, "copy-on-read", 726 qstring_from_str(copy_on_read ? "on" :"off")); 727 728 /* Controller type */ 729 value = qemu_opt_get(legacy_opts, "if"); 730 if (value) { 731 for (type = 0; 732 type < IF_COUNT && strcmp(value, if_name[type]); 733 type++) { 734 } 735 if (type == IF_COUNT) { 736 error_report("unsupported bus type '%s'", value); 737 goto fail; 738 } 739 } else { 740 type = block_default_type; 741 } 742 743 /* Geometry */ 744 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 745 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 746 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 747 748 if (cyls || heads || secs) { 749 if (cyls < 1) { 750 error_report("invalid physical cyls number"); 751 goto fail; 752 } 753 if (heads < 1) { 754 error_report("invalid physical heads number"); 755 goto fail; 756 } 757 if (secs < 1) { 758 error_report("invalid physical secs number"); 759 goto fail; 760 } 761 } 762 763 translation = BIOS_ATA_TRANSLATION_AUTO; 764 value = qemu_opt_get(legacy_opts, "trans"); 765 if (value != NULL) { 766 if (!cyls) { 767 error_report("'%s' trans must be used with cyls, heads and secs", 768 value); 769 goto fail; 770 } 771 if (!strcmp(value, "none")) { 772 translation = BIOS_ATA_TRANSLATION_NONE; 773 } else if (!strcmp(value, "lba")) { 774 translation = BIOS_ATA_TRANSLATION_LBA; 775 } else if (!strcmp(value, "auto")) { 776 translation = BIOS_ATA_TRANSLATION_AUTO; 777 } else { 778 error_report("'%s' invalid translation type", value); 779 goto fail; 780 } 781 } 782 783 if (media == MEDIA_CDROM) { 784 if (cyls || secs || heads) { 785 error_report("CHS can't be set with media=cdrom"); 786 goto fail; 787 } 788 } 789 790 /* Device address specified by bus/unit or index. 791 * If none was specified, try to find the first free one. */ 792 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 793 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 794 index = qemu_opt_get_number(legacy_opts, "index", -1); 795 796 max_devs = if_max_devs[type]; 797 798 if (index != -1) { 799 if (bus_id != 0 || unit_id != -1) { 800 error_report("index cannot be used with bus and unit"); 801 goto fail; 802 } 803 bus_id = drive_index_to_bus_id(type, index); 804 unit_id = drive_index_to_unit_id(type, index); 805 } 806 807 if (unit_id == -1) { 808 unit_id = 0; 809 while (drive_get(type, bus_id, unit_id) != NULL) { 810 unit_id++; 811 if (max_devs && unit_id >= max_devs) { 812 unit_id -= max_devs; 813 bus_id++; 814 } 815 } 816 } 817 818 if (max_devs && unit_id >= max_devs) { 819 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 820 goto fail; 821 } 822 823 if (drive_get(type, bus_id, unit_id) != NULL) { 824 error_report("drive with bus=%d, unit=%d (index=%d) exists", 825 bus_id, unit_id, index); 826 goto fail; 827 } 828 829 /* no id supplied -> create one */ 830 if (qemu_opts_id(all_opts) == NULL) { 831 char *new_id; 832 const char *mediastr = ""; 833 if (type == IF_IDE || type == IF_SCSI) { 834 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 835 } 836 if (max_devs) { 837 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 838 mediastr, unit_id); 839 } else { 840 new_id = g_strdup_printf("%s%s%i", if_name[type], 841 mediastr, unit_id); 842 } 843 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 844 g_free(new_id); 845 } 846 847 /* Add virtio block device */ 848 devaddr = qemu_opt_get(legacy_opts, "addr"); 849 if (devaddr && type != IF_VIRTIO) { 850 error_report("addr is not supported by this bus type"); 851 goto fail; 852 } 853 854 if (type == IF_VIRTIO) { 855 QemuOpts *devopts; 856 devopts = qemu_opts_create_nofail(qemu_find_opts("device")); 857 if (arch_type == QEMU_ARCH_S390X) { 858 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 859 } else { 860 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 861 } 862 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 863 if (devaddr) { 864 qemu_opt_set(devopts, "addr", devaddr); 865 } 866 } 867 868 /* Actual block device init: Functionality shared with blockdev-add */ 869 dinfo = blockdev_init(bs_opts, type, &local_err); 870 if (dinfo == NULL) { 871 if (error_is_set(&local_err)) { 872 qerror_report_err(local_err); 873 error_free(local_err); 874 } 875 goto fail; 876 } else { 877 assert(!error_is_set(&local_err)); 878 } 879 880 /* Set legacy DriveInfo fields */ 881 dinfo->enable_auto_del = true; 882 dinfo->opts = all_opts; 883 884 dinfo->cyls = cyls; 885 dinfo->heads = heads; 886 dinfo->secs = secs; 887 dinfo->trans = translation; 888 889 dinfo->bus = bus_id; 890 dinfo->unit = unit_id; 891 dinfo->devaddr = devaddr; 892 893 switch(type) { 894 case IF_IDE: 895 case IF_SCSI: 896 case IF_XEN: 897 case IF_NONE: 898 dinfo->media_cd = media == MEDIA_CDROM; 899 break; 900 default: 901 break; 902 } 903 904 fail: 905 qemu_opts_del(legacy_opts); 906 return dinfo; 907 } 908 909 void do_commit(Monitor *mon, const QDict *qdict) 910 { 911 const char *device = qdict_get_str(qdict, "device"); 912 BlockDriverState *bs; 913 int ret; 914 915 if (!strcmp(device, "all")) { 916 ret = bdrv_commit_all(); 917 } else { 918 bs = bdrv_find(device); 919 if (!bs) { 920 monitor_printf(mon, "Device '%s' not found\n", device); 921 return; 922 } 923 ret = bdrv_commit(bs); 924 } 925 if (ret < 0) { 926 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 927 strerror(-ret)); 928 } 929 } 930 931 static void blockdev_do_action(int kind, void *data, Error **errp) 932 { 933 TransactionAction action; 934 TransactionActionList list; 935 936 action.kind = kind; 937 action.data = data; 938 list.value = &action; 939 list.next = NULL; 940 qmp_transaction(&list, errp); 941 } 942 943 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, 944 bool has_format, const char *format, 945 bool has_mode, enum NewImageMode mode, 946 Error **errp) 947 { 948 BlockdevSnapshot snapshot = { 949 .device = (char *) device, 950 .snapshot_file = (char *) snapshot_file, 951 .has_format = has_format, 952 .format = (char *) format, 953 .has_mode = has_mode, 954 .mode = mode, 955 }; 956 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 957 &snapshot, errp); 958 } 959 960 void qmp_blockdev_snapshot_internal_sync(const char *device, 961 const char *name, 962 Error **errp) 963 { 964 BlockdevSnapshotInternal snapshot = { 965 .device = (char *) device, 966 .name = (char *) name 967 }; 968 969 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 970 &snapshot, errp); 971 } 972 973 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 974 bool has_id, 975 const char *id, 976 bool has_name, 977 const char *name, 978 Error **errp) 979 { 980 BlockDriverState *bs = bdrv_find(device); 981 QEMUSnapshotInfo sn; 982 Error *local_err = NULL; 983 SnapshotInfo *info = NULL; 984 int ret; 985 986 if (!bs) { 987 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 988 return NULL; 989 } 990 991 if (!has_id) { 992 id = NULL; 993 } 994 995 if (!has_name) { 996 name = NULL; 997 } 998 999 if (!id && !name) { 1000 error_setg(errp, "Name or id must be provided"); 1001 return NULL; 1002 } 1003 1004 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1005 if (error_is_set(&local_err)) { 1006 error_propagate(errp, local_err); 1007 return NULL; 1008 } 1009 if (!ret) { 1010 error_setg(errp, 1011 "Snapshot with id '%s' and name '%s' does not exist on " 1012 "device '%s'", 1013 STR_OR_NULL(id), STR_OR_NULL(name), device); 1014 return NULL; 1015 } 1016 1017 bdrv_snapshot_delete(bs, id, name, &local_err); 1018 if (error_is_set(&local_err)) { 1019 error_propagate(errp, local_err); 1020 return NULL; 1021 } 1022 1023 info = g_malloc0(sizeof(SnapshotInfo)); 1024 info->id = g_strdup(sn.id_str); 1025 info->name = g_strdup(sn.name); 1026 info->date_nsec = sn.date_nsec; 1027 info->date_sec = sn.date_sec; 1028 info->vm_state_size = sn.vm_state_size; 1029 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1030 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1031 1032 return info; 1033 } 1034 1035 /* New and old BlockDriverState structs for group snapshots */ 1036 1037 typedef struct BlkTransactionState BlkTransactionState; 1038 1039 /* Only prepare() may fail. In a single transaction, only one of commit() or 1040 abort() will be called, clean() will always be called if it present. */ 1041 typedef struct BdrvActionOps { 1042 /* Size of state struct, in bytes. */ 1043 size_t instance_size; 1044 /* Prepare the work, must NOT be NULL. */ 1045 void (*prepare)(BlkTransactionState *common, Error **errp); 1046 /* Commit the changes, can be NULL. */ 1047 void (*commit)(BlkTransactionState *common); 1048 /* Abort the changes on fail, can be NULL. */ 1049 void (*abort)(BlkTransactionState *common); 1050 /* Clean up resource in the end, can be NULL. */ 1051 void (*clean)(BlkTransactionState *common); 1052 } BdrvActionOps; 1053 1054 /* 1055 * This structure must be arranged as first member in child type, assuming 1056 * that compiler will also arrange it to the same address with parent instance. 1057 * Later it will be used in free(). 1058 */ 1059 struct BlkTransactionState { 1060 TransactionAction *action; 1061 const BdrvActionOps *ops; 1062 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1063 }; 1064 1065 /* internal snapshot private data */ 1066 typedef struct InternalSnapshotState { 1067 BlkTransactionState common; 1068 BlockDriverState *bs; 1069 QEMUSnapshotInfo sn; 1070 } InternalSnapshotState; 1071 1072 static void internal_snapshot_prepare(BlkTransactionState *common, 1073 Error **errp) 1074 { 1075 const char *device; 1076 const char *name; 1077 BlockDriverState *bs; 1078 QEMUSnapshotInfo old_sn, *sn; 1079 bool ret; 1080 qemu_timeval tv; 1081 BlockdevSnapshotInternal *internal; 1082 InternalSnapshotState *state; 1083 int ret1; 1084 1085 g_assert(common->action->kind == 1086 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1087 internal = common->action->blockdev_snapshot_internal_sync; 1088 state = DO_UPCAST(InternalSnapshotState, common, common); 1089 1090 /* 1. parse input */ 1091 device = internal->device; 1092 name = internal->name; 1093 1094 /* 2. check for validation */ 1095 bs = bdrv_find(device); 1096 if (!bs) { 1097 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1098 return; 1099 } 1100 1101 if (!bdrv_is_inserted(bs)) { 1102 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1103 return; 1104 } 1105 1106 if (bdrv_is_read_only(bs)) { 1107 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1108 return; 1109 } 1110 1111 if (!bdrv_can_snapshot(bs)) { 1112 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1113 bs->drv->format_name, device, "internal snapshot"); 1114 return; 1115 } 1116 1117 if (!strlen(name)) { 1118 error_setg(errp, "Name is empty"); 1119 return; 1120 } 1121 1122 /* check whether a snapshot with name exist */ 1123 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp); 1124 if (error_is_set(errp)) { 1125 return; 1126 } else if (ret) { 1127 error_setg(errp, 1128 "Snapshot with name '%s' already exists on device '%s'", 1129 name, device); 1130 return; 1131 } 1132 1133 /* 3. take the snapshot */ 1134 sn = &state->sn; 1135 pstrcpy(sn->name, sizeof(sn->name), name); 1136 qemu_gettimeofday(&tv); 1137 sn->date_sec = tv.tv_sec; 1138 sn->date_nsec = tv.tv_usec * 1000; 1139 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1140 1141 ret1 = bdrv_snapshot_create(bs, sn); 1142 if (ret1 < 0) { 1143 error_setg_errno(errp, -ret1, 1144 "Failed to create snapshot '%s' on device '%s'", 1145 name, device); 1146 return; 1147 } 1148 1149 /* 4. succeed, mark a snapshot is created */ 1150 state->bs = bs; 1151 } 1152 1153 static void internal_snapshot_abort(BlkTransactionState *common) 1154 { 1155 InternalSnapshotState *state = 1156 DO_UPCAST(InternalSnapshotState, common, common); 1157 BlockDriverState *bs = state->bs; 1158 QEMUSnapshotInfo *sn = &state->sn; 1159 Error *local_error = NULL; 1160 1161 if (!bs) { 1162 return; 1163 } 1164 1165 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1166 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1167 "device '%s' in abort: %s", 1168 sn->id_str, 1169 sn->name, 1170 bdrv_get_device_name(bs), 1171 error_get_pretty(local_error)); 1172 error_free(local_error); 1173 } 1174 } 1175 1176 /* external snapshot private data */ 1177 typedef struct ExternalSnapshotState { 1178 BlkTransactionState common; 1179 BlockDriverState *old_bs; 1180 BlockDriverState *new_bs; 1181 } ExternalSnapshotState; 1182 1183 static void external_snapshot_prepare(BlkTransactionState *common, 1184 Error **errp) 1185 { 1186 BlockDriver *drv; 1187 int flags, ret; 1188 Error *local_err = NULL; 1189 const char *device; 1190 const char *new_image_file; 1191 const char *format = "qcow2"; 1192 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1193 ExternalSnapshotState *state = 1194 DO_UPCAST(ExternalSnapshotState, common, common); 1195 TransactionAction *action = common->action; 1196 1197 /* get parameters */ 1198 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1199 1200 device = action->blockdev_snapshot_sync->device; 1201 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1202 if (action->blockdev_snapshot_sync->has_format) { 1203 format = action->blockdev_snapshot_sync->format; 1204 } 1205 if (action->blockdev_snapshot_sync->has_mode) { 1206 mode = action->blockdev_snapshot_sync->mode; 1207 } 1208 1209 /* start processing */ 1210 drv = bdrv_find_format(format); 1211 if (!drv) { 1212 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1213 return; 1214 } 1215 1216 state->old_bs = bdrv_find(device); 1217 if (!state->old_bs) { 1218 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1219 return; 1220 } 1221 1222 if (!bdrv_is_inserted(state->old_bs)) { 1223 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1224 return; 1225 } 1226 1227 if (bdrv_in_use(state->old_bs)) { 1228 error_set(errp, QERR_DEVICE_IN_USE, device); 1229 return; 1230 } 1231 1232 if (!bdrv_is_read_only(state->old_bs)) { 1233 if (bdrv_flush(state->old_bs)) { 1234 error_set(errp, QERR_IO_ERROR); 1235 return; 1236 } 1237 } 1238 1239 if (bdrv_check_ext_snapshot(state->old_bs) != EXT_SNAPSHOT_ALLOWED) { 1240 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1241 return; 1242 } 1243 1244 flags = state->old_bs->open_flags; 1245 1246 /* create new image w/backing file */ 1247 if (mode != NEW_IMAGE_MODE_EXISTING) { 1248 bdrv_img_create(new_image_file, format, 1249 state->old_bs->filename, 1250 state->old_bs->drv->format_name, 1251 NULL, -1, flags, &local_err, false); 1252 if (error_is_set(&local_err)) { 1253 error_propagate(errp, local_err); 1254 return; 1255 } 1256 } 1257 1258 /* We will manually add the backing_hd field to the bs later */ 1259 state->new_bs = bdrv_new(""); 1260 /* TODO Inherit bs->options or only take explicit options with an 1261 * extended QMP command? */ 1262 ret = bdrv_open(state->new_bs, new_image_file, NULL, 1263 flags | BDRV_O_NO_BACKING, drv, &local_err); 1264 if (ret != 0) { 1265 error_propagate(errp, local_err); 1266 } 1267 } 1268 1269 static void external_snapshot_commit(BlkTransactionState *common) 1270 { 1271 ExternalSnapshotState *state = 1272 DO_UPCAST(ExternalSnapshotState, common, common); 1273 1274 /* This removes our old bs and adds the new bs */ 1275 bdrv_append(state->new_bs, state->old_bs); 1276 /* We don't need (or want) to use the transactional 1277 * bdrv_reopen_multiple() across all the entries at once, because we 1278 * don't want to abort all of them if one of them fails the reopen */ 1279 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1280 NULL); 1281 } 1282 1283 static void external_snapshot_abort(BlkTransactionState *common) 1284 { 1285 ExternalSnapshotState *state = 1286 DO_UPCAST(ExternalSnapshotState, common, common); 1287 if (state->new_bs) { 1288 bdrv_unref(state->new_bs); 1289 } 1290 } 1291 1292 typedef struct DriveBackupState { 1293 BlkTransactionState common; 1294 BlockDriverState *bs; 1295 BlockJob *job; 1296 } DriveBackupState; 1297 1298 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1299 { 1300 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1301 DriveBackup *backup; 1302 Error *local_err = NULL; 1303 1304 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1305 backup = common->action->drive_backup; 1306 1307 qmp_drive_backup(backup->device, backup->target, 1308 backup->has_format, backup->format, 1309 backup->sync, 1310 backup->has_mode, backup->mode, 1311 backup->has_speed, backup->speed, 1312 backup->has_on_source_error, backup->on_source_error, 1313 backup->has_on_target_error, backup->on_target_error, 1314 &local_err); 1315 if (error_is_set(&local_err)) { 1316 error_propagate(errp, local_err); 1317 state->bs = NULL; 1318 state->job = NULL; 1319 return; 1320 } 1321 1322 state->bs = bdrv_find(backup->device); 1323 state->job = state->bs->job; 1324 } 1325 1326 static void drive_backup_abort(BlkTransactionState *common) 1327 { 1328 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1329 BlockDriverState *bs = state->bs; 1330 1331 /* Only cancel if it's the job we started */ 1332 if (bs && bs->job && bs->job == state->job) { 1333 block_job_cancel_sync(bs->job); 1334 } 1335 } 1336 1337 static void abort_prepare(BlkTransactionState *common, Error **errp) 1338 { 1339 error_setg(errp, "Transaction aborted using Abort action"); 1340 } 1341 1342 static void abort_commit(BlkTransactionState *common) 1343 { 1344 g_assert_not_reached(); /* this action never succeeds */ 1345 } 1346 1347 static const BdrvActionOps actions[] = { 1348 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1349 .instance_size = sizeof(ExternalSnapshotState), 1350 .prepare = external_snapshot_prepare, 1351 .commit = external_snapshot_commit, 1352 .abort = external_snapshot_abort, 1353 }, 1354 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1355 .instance_size = sizeof(DriveBackupState), 1356 .prepare = drive_backup_prepare, 1357 .abort = drive_backup_abort, 1358 }, 1359 [TRANSACTION_ACTION_KIND_ABORT] = { 1360 .instance_size = sizeof(BlkTransactionState), 1361 .prepare = abort_prepare, 1362 .commit = abort_commit, 1363 }, 1364 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1365 .instance_size = sizeof(InternalSnapshotState), 1366 .prepare = internal_snapshot_prepare, 1367 .abort = internal_snapshot_abort, 1368 }, 1369 }; 1370 1371 /* 1372 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1373 * then we do not pivot any of the devices in the group, and abandon the 1374 * snapshots 1375 */ 1376 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1377 { 1378 TransactionActionList *dev_entry = dev_list; 1379 BlkTransactionState *state, *next; 1380 Error *local_err = NULL; 1381 1382 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1383 QSIMPLEQ_INIT(&snap_bdrv_states); 1384 1385 /* drain all i/o before any snapshots */ 1386 bdrv_drain_all(); 1387 1388 /* We don't do anything in this loop that commits us to the snapshot */ 1389 while (NULL != dev_entry) { 1390 TransactionAction *dev_info = NULL; 1391 const BdrvActionOps *ops; 1392 1393 dev_info = dev_entry->value; 1394 dev_entry = dev_entry->next; 1395 1396 assert(dev_info->kind < ARRAY_SIZE(actions)); 1397 1398 ops = &actions[dev_info->kind]; 1399 assert(ops->instance_size > 0); 1400 1401 state = g_malloc0(ops->instance_size); 1402 state->ops = ops; 1403 state->action = dev_info; 1404 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1405 1406 state->ops->prepare(state, &local_err); 1407 if (error_is_set(&local_err)) { 1408 error_propagate(errp, local_err); 1409 goto delete_and_fail; 1410 } 1411 } 1412 1413 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1414 if (state->ops->commit) { 1415 state->ops->commit(state); 1416 } 1417 } 1418 1419 /* success */ 1420 goto exit; 1421 1422 delete_and_fail: 1423 /* 1424 * failure, and it is all-or-none; abandon each new bs, and keep using 1425 * the original bs for all images 1426 */ 1427 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1428 if (state->ops->abort) { 1429 state->ops->abort(state); 1430 } 1431 } 1432 exit: 1433 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1434 if (state->ops->clean) { 1435 state->ops->clean(state); 1436 } 1437 g_free(state); 1438 } 1439 } 1440 1441 1442 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1443 { 1444 if (bdrv_in_use(bs)) { 1445 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1446 return; 1447 } 1448 if (!bdrv_dev_has_removable_media(bs)) { 1449 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 1450 return; 1451 } 1452 1453 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1454 bdrv_dev_eject_request(bs, force); 1455 if (!force) { 1456 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 1457 return; 1458 } 1459 } 1460 1461 bdrv_close(bs); 1462 } 1463 1464 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1465 { 1466 BlockDriverState *bs; 1467 1468 bs = bdrv_find(device); 1469 if (!bs) { 1470 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1471 return; 1472 } 1473 1474 eject_device(bs, force, errp); 1475 } 1476 1477 void qmp_block_passwd(const char *device, const char *password, Error **errp) 1478 { 1479 BlockDriverState *bs; 1480 int err; 1481 1482 bs = bdrv_find(device); 1483 if (!bs) { 1484 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1485 return; 1486 } 1487 1488 err = bdrv_set_key(bs, password); 1489 if (err == -EINVAL) { 1490 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1491 return; 1492 } else if (err < 0) { 1493 error_set(errp, QERR_INVALID_PASSWORD); 1494 return; 1495 } 1496 } 1497 1498 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1499 int bdrv_flags, BlockDriver *drv, 1500 const char *password, Error **errp) 1501 { 1502 Error *local_err = NULL; 1503 int ret; 1504 1505 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err); 1506 if (ret < 0) { 1507 error_propagate(errp, local_err); 1508 return; 1509 } 1510 1511 if (bdrv_key_required(bs)) { 1512 if (password) { 1513 if (bdrv_set_key(bs, password) < 0) { 1514 error_set(errp, QERR_INVALID_PASSWORD); 1515 } 1516 } else { 1517 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1518 bdrv_get_encrypted_filename(bs)); 1519 } 1520 } else if (password) { 1521 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1522 } 1523 } 1524 1525 void qmp_change_blockdev(const char *device, const char *filename, 1526 bool has_format, const char *format, Error **errp) 1527 { 1528 BlockDriverState *bs; 1529 BlockDriver *drv = NULL; 1530 int bdrv_flags; 1531 Error *err = NULL; 1532 1533 bs = bdrv_find(device); 1534 if (!bs) { 1535 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1536 return; 1537 } 1538 1539 if (format) { 1540 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1541 if (!drv) { 1542 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1543 return; 1544 } 1545 } 1546 1547 eject_device(bs, 0, &err); 1548 if (error_is_set(&err)) { 1549 error_propagate(errp, err); 1550 return; 1551 } 1552 1553 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1554 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1555 1556 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1557 } 1558 1559 /* throttling disk I/O limits */ 1560 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1561 int64_t bps_wr, 1562 int64_t iops, 1563 int64_t iops_rd, 1564 int64_t iops_wr, 1565 bool has_bps_max, 1566 int64_t bps_max, 1567 bool has_bps_rd_max, 1568 int64_t bps_rd_max, 1569 bool has_bps_wr_max, 1570 int64_t bps_wr_max, 1571 bool has_iops_max, 1572 int64_t iops_max, 1573 bool has_iops_rd_max, 1574 int64_t iops_rd_max, 1575 bool has_iops_wr_max, 1576 int64_t iops_wr_max, 1577 bool has_iops_size, 1578 int64_t iops_size, Error **errp) 1579 { 1580 ThrottleConfig cfg; 1581 BlockDriverState *bs; 1582 1583 bs = bdrv_find(device); 1584 if (!bs) { 1585 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1586 return; 1587 } 1588 1589 memset(&cfg, 0, sizeof(cfg)); 1590 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1591 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1592 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1593 1594 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1595 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1596 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1597 1598 if (has_bps_max) { 1599 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1600 } 1601 if (has_bps_rd_max) { 1602 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1603 } 1604 if (has_bps_wr_max) { 1605 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1606 } 1607 if (has_iops_max) { 1608 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1609 } 1610 if (has_iops_rd_max) { 1611 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1612 } 1613 if (has_iops_wr_max) { 1614 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1615 } 1616 1617 if (has_iops_size) { 1618 cfg.op_size = iops_size; 1619 } 1620 1621 if (!check_throttle_config(&cfg, errp)) { 1622 return; 1623 } 1624 1625 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1626 bdrv_io_limits_enable(bs); 1627 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1628 bdrv_io_limits_disable(bs); 1629 } 1630 1631 if (bs->io_limits_enabled) { 1632 bdrv_set_io_limits(bs, &cfg); 1633 } 1634 } 1635 1636 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1637 { 1638 const char *id = qdict_get_str(qdict, "id"); 1639 BlockDriverState *bs; 1640 1641 bs = bdrv_find(id); 1642 if (!bs) { 1643 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1644 return -1; 1645 } 1646 if (bdrv_in_use(bs)) { 1647 qerror_report(QERR_DEVICE_IN_USE, id); 1648 return -1; 1649 } 1650 1651 /* quiesce block driver; prevent further io */ 1652 bdrv_drain_all(); 1653 bdrv_flush(bs); 1654 bdrv_close(bs); 1655 1656 /* if we have a device attached to this BlockDriverState 1657 * then we need to make the drive anonymous until the device 1658 * can be removed. If this is a drive with no device backing 1659 * then we can just get rid of the block driver state right here. 1660 */ 1661 if (bdrv_get_attached_dev(bs)) { 1662 bdrv_make_anon(bs); 1663 1664 /* Further I/O must not pause the guest */ 1665 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1666 BLOCKDEV_ON_ERROR_REPORT); 1667 } else { 1668 drive_uninit(drive_get_by_blockdev(bs)); 1669 } 1670 1671 return 0; 1672 } 1673 1674 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1675 { 1676 BlockDriverState *bs; 1677 int ret; 1678 1679 bs = bdrv_find(device); 1680 if (!bs) { 1681 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1682 return; 1683 } 1684 1685 if (size < 0) { 1686 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1687 return; 1688 } 1689 1690 /* complete all in-flight operations before resizing the device */ 1691 bdrv_drain_all(); 1692 1693 ret = bdrv_truncate(bs, size); 1694 switch (ret) { 1695 case 0: 1696 break; 1697 case -ENOMEDIUM: 1698 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1699 break; 1700 case -ENOTSUP: 1701 error_set(errp, QERR_UNSUPPORTED); 1702 break; 1703 case -EACCES: 1704 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1705 break; 1706 case -EBUSY: 1707 error_set(errp, QERR_DEVICE_IN_USE, device); 1708 break; 1709 default: 1710 error_setg_errno(errp, -ret, "Could not resize"); 1711 break; 1712 } 1713 } 1714 1715 static void block_job_cb(void *opaque, int ret) 1716 { 1717 BlockDriverState *bs = opaque; 1718 QObject *obj; 1719 1720 trace_block_job_cb(bs, bs->job, ret); 1721 1722 assert(bs->job); 1723 obj = qobject_from_block_job(bs->job); 1724 if (ret < 0) { 1725 QDict *dict = qobject_to_qdict(obj); 1726 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1727 } 1728 1729 if (block_job_is_cancelled(bs->job)) { 1730 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1731 } else { 1732 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1733 } 1734 qobject_decref(obj); 1735 1736 bdrv_put_ref_bh_schedule(bs); 1737 } 1738 1739 void qmp_block_stream(const char *device, bool has_base, 1740 const char *base, bool has_speed, int64_t speed, 1741 bool has_on_error, BlockdevOnError on_error, 1742 Error **errp) 1743 { 1744 BlockDriverState *bs; 1745 BlockDriverState *base_bs = NULL; 1746 Error *local_err = NULL; 1747 1748 if (!has_on_error) { 1749 on_error = BLOCKDEV_ON_ERROR_REPORT; 1750 } 1751 1752 bs = bdrv_find(device); 1753 if (!bs) { 1754 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1755 return; 1756 } 1757 1758 if (base) { 1759 base_bs = bdrv_find_backing_image(bs, base); 1760 if (base_bs == NULL) { 1761 error_set(errp, QERR_BASE_NOT_FOUND, base); 1762 return; 1763 } 1764 } 1765 1766 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1767 on_error, block_job_cb, bs, &local_err); 1768 if (error_is_set(&local_err)) { 1769 error_propagate(errp, local_err); 1770 return; 1771 } 1772 1773 trace_qmp_block_stream(bs, bs->job); 1774 } 1775 1776 void qmp_block_commit(const char *device, 1777 bool has_base, const char *base, const char *top, 1778 bool has_speed, int64_t speed, 1779 Error **errp) 1780 { 1781 BlockDriverState *bs; 1782 BlockDriverState *base_bs, *top_bs; 1783 Error *local_err = NULL; 1784 /* This will be part of the QMP command, if/when the 1785 * BlockdevOnError change for blkmirror makes it in 1786 */ 1787 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1788 1789 /* drain all i/o before commits */ 1790 bdrv_drain_all(); 1791 1792 bs = bdrv_find(device); 1793 if (!bs) { 1794 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1795 return; 1796 } 1797 1798 /* default top_bs is the active layer */ 1799 top_bs = bs; 1800 1801 if (top) { 1802 if (strcmp(bs->filename, top) != 0) { 1803 top_bs = bdrv_find_backing_image(bs, top); 1804 } 1805 } 1806 1807 if (top_bs == NULL) { 1808 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1809 return; 1810 } 1811 1812 if (has_base && base) { 1813 base_bs = bdrv_find_backing_image(top_bs, base); 1814 } else { 1815 base_bs = bdrv_find_base(top_bs); 1816 } 1817 1818 if (base_bs == NULL) { 1819 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1820 return; 1821 } 1822 1823 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1824 &local_err); 1825 if (local_err != NULL) { 1826 error_propagate(errp, local_err); 1827 return; 1828 } 1829 } 1830 1831 void qmp_drive_backup(const char *device, const char *target, 1832 bool has_format, const char *format, 1833 enum MirrorSyncMode sync, 1834 bool has_mode, enum NewImageMode mode, 1835 bool has_speed, int64_t speed, 1836 bool has_on_source_error, BlockdevOnError on_source_error, 1837 bool has_on_target_error, BlockdevOnError on_target_error, 1838 Error **errp) 1839 { 1840 BlockDriverState *bs; 1841 BlockDriverState *target_bs; 1842 BlockDriverState *source = NULL; 1843 BlockDriver *drv = NULL; 1844 Error *local_err = NULL; 1845 int flags; 1846 int64_t size; 1847 int ret; 1848 1849 if (!has_speed) { 1850 speed = 0; 1851 } 1852 if (!has_on_source_error) { 1853 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1854 } 1855 if (!has_on_target_error) { 1856 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1857 } 1858 if (!has_mode) { 1859 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1860 } 1861 1862 bs = bdrv_find(device); 1863 if (!bs) { 1864 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1865 return; 1866 } 1867 1868 if (!bdrv_is_inserted(bs)) { 1869 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1870 return; 1871 } 1872 1873 if (!has_format) { 1874 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1875 } 1876 if (format) { 1877 drv = bdrv_find_format(format); 1878 if (!drv) { 1879 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1880 return; 1881 } 1882 } 1883 1884 if (bdrv_in_use(bs)) { 1885 error_set(errp, QERR_DEVICE_IN_USE, device); 1886 return; 1887 } 1888 1889 flags = bs->open_flags | BDRV_O_RDWR; 1890 1891 /* See if we have a backing HD we can use to create our new image 1892 * on top of. */ 1893 if (sync == MIRROR_SYNC_MODE_TOP) { 1894 source = bs->backing_hd; 1895 if (!source) { 1896 sync = MIRROR_SYNC_MODE_FULL; 1897 } 1898 } 1899 if (sync == MIRROR_SYNC_MODE_NONE) { 1900 source = bs; 1901 } 1902 1903 size = bdrv_getlength(bs); 1904 if (size < 0) { 1905 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1906 return; 1907 } 1908 1909 if (mode != NEW_IMAGE_MODE_EXISTING) { 1910 assert(format && drv); 1911 if (source) { 1912 bdrv_img_create(target, format, source->filename, 1913 source->drv->format_name, NULL, 1914 size, flags, &local_err, false); 1915 } else { 1916 bdrv_img_create(target, format, NULL, NULL, NULL, 1917 size, flags, &local_err, false); 1918 } 1919 } 1920 1921 if (error_is_set(&local_err)) { 1922 error_propagate(errp, local_err); 1923 return; 1924 } 1925 1926 target_bs = bdrv_new(""); 1927 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err); 1928 if (ret < 0) { 1929 bdrv_unref(target_bs); 1930 error_propagate(errp, local_err); 1931 return; 1932 } 1933 1934 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 1935 block_job_cb, bs, &local_err); 1936 if (local_err != NULL) { 1937 bdrv_unref(target_bs); 1938 error_propagate(errp, local_err); 1939 return; 1940 } 1941 } 1942 1943 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 1944 1945 void qmp_drive_mirror(const char *device, const char *target, 1946 bool has_format, const char *format, 1947 enum MirrorSyncMode sync, 1948 bool has_mode, enum NewImageMode mode, 1949 bool has_speed, int64_t speed, 1950 bool has_granularity, uint32_t granularity, 1951 bool has_buf_size, int64_t buf_size, 1952 bool has_on_source_error, BlockdevOnError on_source_error, 1953 bool has_on_target_error, BlockdevOnError on_target_error, 1954 Error **errp) 1955 { 1956 BlockDriverState *bs; 1957 BlockDriverState *source, *target_bs; 1958 BlockDriver *drv = NULL; 1959 Error *local_err = NULL; 1960 int flags; 1961 int64_t size; 1962 int ret; 1963 1964 if (!has_speed) { 1965 speed = 0; 1966 } 1967 if (!has_on_source_error) { 1968 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1969 } 1970 if (!has_on_target_error) { 1971 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1972 } 1973 if (!has_mode) { 1974 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1975 } 1976 if (!has_granularity) { 1977 granularity = 0; 1978 } 1979 if (!has_buf_size) { 1980 buf_size = DEFAULT_MIRROR_BUF_SIZE; 1981 } 1982 1983 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 1984 error_set(errp, QERR_INVALID_PARAMETER, device); 1985 return; 1986 } 1987 if (granularity & (granularity - 1)) { 1988 error_set(errp, QERR_INVALID_PARAMETER, device); 1989 return; 1990 } 1991 1992 bs = bdrv_find(device); 1993 if (!bs) { 1994 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1995 return; 1996 } 1997 1998 if (!bdrv_is_inserted(bs)) { 1999 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2000 return; 2001 } 2002 2003 if (!has_format) { 2004 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2005 } 2006 if (format) { 2007 drv = bdrv_find_format(format); 2008 if (!drv) { 2009 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2010 return; 2011 } 2012 } 2013 2014 if (bdrv_in_use(bs)) { 2015 error_set(errp, QERR_DEVICE_IN_USE, device); 2016 return; 2017 } 2018 2019 flags = bs->open_flags | BDRV_O_RDWR; 2020 source = bs->backing_hd; 2021 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2022 sync = MIRROR_SYNC_MODE_FULL; 2023 } 2024 if (sync == MIRROR_SYNC_MODE_NONE) { 2025 source = bs; 2026 } 2027 2028 size = bdrv_getlength(bs); 2029 if (size < 0) { 2030 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2031 return; 2032 } 2033 2034 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2035 && mode != NEW_IMAGE_MODE_EXISTING) 2036 { 2037 /* create new image w/o backing file */ 2038 assert(format && drv); 2039 bdrv_img_create(target, format, 2040 NULL, NULL, NULL, size, flags, &local_err, false); 2041 } else { 2042 switch (mode) { 2043 case NEW_IMAGE_MODE_EXISTING: 2044 break; 2045 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2046 /* create new image with backing file */ 2047 bdrv_img_create(target, format, 2048 source->filename, 2049 source->drv->format_name, 2050 NULL, size, flags, &local_err, false); 2051 break; 2052 default: 2053 abort(); 2054 } 2055 } 2056 2057 if (error_is_set(&local_err)) { 2058 error_propagate(errp, local_err); 2059 return; 2060 } 2061 2062 /* Mirroring takes care of copy-on-write using the source's backing 2063 * file. 2064 */ 2065 target_bs = bdrv_new(""); 2066 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv, 2067 &local_err); 2068 if (ret < 0) { 2069 bdrv_unref(target_bs); 2070 error_propagate(errp, local_err); 2071 return; 2072 } 2073 2074 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 2075 on_source_error, on_target_error, 2076 block_job_cb, bs, &local_err); 2077 if (local_err != NULL) { 2078 bdrv_unref(target_bs); 2079 error_propagate(errp, local_err); 2080 return; 2081 } 2082 } 2083 2084 static BlockJob *find_block_job(const char *device) 2085 { 2086 BlockDriverState *bs; 2087 2088 bs = bdrv_find(device); 2089 if (!bs || !bs->job) { 2090 return NULL; 2091 } 2092 return bs->job; 2093 } 2094 2095 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2096 { 2097 BlockJob *job = find_block_job(device); 2098 2099 if (!job) { 2100 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2101 return; 2102 } 2103 2104 block_job_set_speed(job, speed, errp); 2105 } 2106 2107 void qmp_block_job_cancel(const char *device, 2108 bool has_force, bool force, Error **errp) 2109 { 2110 BlockJob *job = find_block_job(device); 2111 2112 if (!has_force) { 2113 force = false; 2114 } 2115 2116 if (!job) { 2117 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2118 return; 2119 } 2120 if (job->paused && !force) { 2121 error_set(errp, QERR_BLOCK_JOB_PAUSED, device); 2122 return; 2123 } 2124 2125 trace_qmp_block_job_cancel(job); 2126 block_job_cancel(job); 2127 } 2128 2129 void qmp_block_job_pause(const char *device, Error **errp) 2130 { 2131 BlockJob *job = find_block_job(device); 2132 2133 if (!job) { 2134 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2135 return; 2136 } 2137 2138 trace_qmp_block_job_pause(job); 2139 block_job_pause(job); 2140 } 2141 2142 void qmp_block_job_resume(const char *device, Error **errp) 2143 { 2144 BlockJob *job = find_block_job(device); 2145 2146 if (!job) { 2147 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2148 return; 2149 } 2150 2151 trace_qmp_block_job_resume(job); 2152 block_job_resume(job); 2153 } 2154 2155 void qmp_block_job_complete(const char *device, Error **errp) 2156 { 2157 BlockJob *job = find_block_job(device); 2158 2159 if (!job) { 2160 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2161 return; 2162 } 2163 2164 trace_qmp_block_job_complete(job); 2165 block_job_complete(job, errp); 2166 } 2167 2168 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2169 { 2170 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2171 QObject *obj; 2172 QDict *qdict; 2173 Error *local_err = NULL; 2174 2175 /* Require an ID in the top level */ 2176 if (!options->has_id) { 2177 error_setg(errp, "Block device needs an ID"); 2178 goto fail; 2179 } 2180 2181 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with 2182 * cache.direct=false instead of silently switching to aio=threads, except 2183 * if called from drive_init. 2184 * 2185 * For now, simply forbidding the combination for all drivers will do. */ 2186 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2187 bool direct = options->cache->has_direct && options->cache->direct; 2188 if (!options->has_cache && !direct) { 2189 error_setg(errp, "aio=native requires cache.direct=true"); 2190 goto fail; 2191 } 2192 } 2193 2194 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2195 &options, NULL, &local_err); 2196 if (error_is_set(&local_err)) { 2197 error_propagate(errp, local_err); 2198 goto fail; 2199 } 2200 2201 obj = qmp_output_get_qobject(ov); 2202 qdict = qobject_to_qdict(obj); 2203 2204 qdict_flatten(qdict); 2205 2206 blockdev_init(qdict, IF_NONE, &local_err); 2207 if (error_is_set(&local_err)) { 2208 error_propagate(errp, local_err); 2209 goto fail; 2210 } 2211 2212 fail: 2213 qmp_output_visitor_cleanup(ov); 2214 } 2215 2216 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 2217 { 2218 BlockJobInfoList **prev = opaque; 2219 BlockJob *job = bs->job; 2220 2221 if (job) { 2222 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2223 elem->value = block_job_query(bs->job); 2224 (*prev)->next = elem; 2225 *prev = elem; 2226 } 2227 } 2228 2229 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2230 { 2231 /* Dummy is a fake list element for holding the head pointer */ 2232 BlockJobInfoList dummy = {}; 2233 BlockJobInfoList *prev = &dummy; 2234 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 2235 return dummy.next; 2236 } 2237 2238 QemuOptsList qemu_common_drive_opts = { 2239 .name = "drive", 2240 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2241 .desc = { 2242 { 2243 .name = "snapshot", 2244 .type = QEMU_OPT_BOOL, 2245 .help = "enable/disable snapshot mode", 2246 },{ 2247 .name = "file", 2248 .type = QEMU_OPT_STRING, 2249 .help = "disk image", 2250 },{ 2251 .name = "discard", 2252 .type = QEMU_OPT_STRING, 2253 .help = "discard operation (ignore/off, unmap/on)", 2254 },{ 2255 .name = "cache.writeback", 2256 .type = QEMU_OPT_BOOL, 2257 .help = "enables writeback mode for any caches", 2258 },{ 2259 .name = "cache.direct", 2260 .type = QEMU_OPT_BOOL, 2261 .help = "enables use of O_DIRECT (bypass the host page cache)", 2262 },{ 2263 .name = "cache.no-flush", 2264 .type = QEMU_OPT_BOOL, 2265 .help = "ignore any flush requests for the device", 2266 },{ 2267 .name = "aio", 2268 .type = QEMU_OPT_STRING, 2269 .help = "host AIO implementation (threads, native)", 2270 },{ 2271 .name = "format", 2272 .type = QEMU_OPT_STRING, 2273 .help = "disk format (raw, qcow2, ...)", 2274 },{ 2275 .name = "serial", 2276 .type = QEMU_OPT_STRING, 2277 .help = "disk serial number", 2278 },{ 2279 .name = "rerror", 2280 .type = QEMU_OPT_STRING, 2281 .help = "read error action", 2282 },{ 2283 .name = "werror", 2284 .type = QEMU_OPT_STRING, 2285 .help = "write error action", 2286 },{ 2287 .name = "read-only", 2288 .type = QEMU_OPT_BOOL, 2289 .help = "open drive file as read-only", 2290 },{ 2291 .name = "throttling.iops-total", 2292 .type = QEMU_OPT_NUMBER, 2293 .help = "limit total I/O operations per second", 2294 },{ 2295 .name = "throttling.iops-read", 2296 .type = QEMU_OPT_NUMBER, 2297 .help = "limit read operations per second", 2298 },{ 2299 .name = "throttling.iops-write", 2300 .type = QEMU_OPT_NUMBER, 2301 .help = "limit write operations per second", 2302 },{ 2303 .name = "throttling.bps-total", 2304 .type = QEMU_OPT_NUMBER, 2305 .help = "limit total bytes per second", 2306 },{ 2307 .name = "throttling.bps-read", 2308 .type = QEMU_OPT_NUMBER, 2309 .help = "limit read bytes per second", 2310 },{ 2311 .name = "throttling.bps-write", 2312 .type = QEMU_OPT_NUMBER, 2313 .help = "limit write bytes per second", 2314 },{ 2315 .name = "throttling.iops-total-max", 2316 .type = QEMU_OPT_NUMBER, 2317 .help = "I/O operations burst", 2318 },{ 2319 .name = "throttling.iops-read-max", 2320 .type = QEMU_OPT_NUMBER, 2321 .help = "I/O operations read burst", 2322 },{ 2323 .name = "throttling.iops-write-max", 2324 .type = QEMU_OPT_NUMBER, 2325 .help = "I/O operations write burst", 2326 },{ 2327 .name = "throttling.bps-total-max", 2328 .type = QEMU_OPT_NUMBER, 2329 .help = "total bytes burst", 2330 },{ 2331 .name = "throttling.bps-read-max", 2332 .type = QEMU_OPT_NUMBER, 2333 .help = "total bytes read burst", 2334 },{ 2335 .name = "throttling.bps-write-max", 2336 .type = QEMU_OPT_NUMBER, 2337 .help = "total bytes write burst", 2338 },{ 2339 .name = "throttling.iops-size", 2340 .type = QEMU_OPT_NUMBER, 2341 .help = "when limiting by iops max size of an I/O in bytes", 2342 },{ 2343 .name = "copy-on-read", 2344 .type = QEMU_OPT_BOOL, 2345 .help = "copy read data from backing file into image file", 2346 }, 2347 { /* end of list */ } 2348 }, 2349 }; 2350 2351 QemuOptsList qemu_drive_opts = { 2352 .name = "drive", 2353 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2354 .desc = { 2355 /* 2356 * no elements => accept any params 2357 * validation will happen later 2358 */ 2359 { /* end of list */ } 2360 }, 2361 }; 2362