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(const char *file, QDict *bs_opts, 311 BlockInterfaceType type, 312 Error **errp) 313 { 314 const char *buf; 315 const char *serial; 316 int ro = 0; 317 int bdrv_flags = 0; 318 int on_read_error, on_write_error; 319 DriveInfo *dinfo; 320 ThrottleConfig cfg; 321 int snapshot = 0; 322 bool copy_on_read; 323 int ret; 324 Error *error = NULL; 325 QemuOpts *opts; 326 const char *id; 327 bool has_driver_specific_opts; 328 BlockDriver *drv = NULL; 329 330 /* Check common options by copying from bs_opts to opts, all other options 331 * stay in bs_opts for processing by bdrv_open(). */ 332 id = qdict_get_try_str(bs_opts, "id"); 333 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 334 if (error_is_set(&error)) { 335 error_propagate(errp, error); 336 return NULL; 337 } 338 339 qemu_opts_absorb_qdict(opts, bs_opts, &error); 340 if (error_is_set(&error)) { 341 error_propagate(errp, error); 342 goto early_err; 343 } 344 345 if (id) { 346 qdict_del(bs_opts, "id"); 347 } 348 349 has_driver_specific_opts = !!qdict_size(bs_opts); 350 351 /* extract parameters */ 352 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 353 ro = qemu_opt_get_bool(opts, "read-only", 0); 354 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 355 356 serial = qemu_opt_get(opts, "serial"); 357 358 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 359 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 360 error_setg(errp, "invalid discard option"); 361 goto early_err; 362 } 363 } 364 365 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 366 bdrv_flags |= BDRV_O_CACHE_WB; 367 } 368 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 369 bdrv_flags |= BDRV_O_NOCACHE; 370 } 371 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 372 bdrv_flags |= BDRV_O_NO_FLUSH; 373 } 374 375 #ifdef CONFIG_LINUX_AIO 376 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 377 if (!strcmp(buf, "native")) { 378 bdrv_flags |= BDRV_O_NATIVE_AIO; 379 } else if (!strcmp(buf, "threads")) { 380 /* this is the default */ 381 } else { 382 error_setg(errp, "invalid aio option"); 383 goto early_err; 384 } 385 } 386 #endif 387 388 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 389 if (is_help_option(buf)) { 390 error_printf("Supported formats:"); 391 bdrv_iterate_format(bdrv_format_print, NULL); 392 error_printf("\n"); 393 goto early_err; 394 } 395 396 drv = bdrv_find_format(buf); 397 if (!drv) { 398 error_setg(errp, "'%s' invalid format", buf); 399 goto early_err; 400 } 401 } 402 403 /* disk I/O throttling */ 404 memset(&cfg, 0, sizeof(cfg)); 405 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 406 qemu_opt_get_number(opts, "throttling.bps-total", 0); 407 cfg.buckets[THROTTLE_BPS_READ].avg = 408 qemu_opt_get_number(opts, "throttling.bps-read", 0); 409 cfg.buckets[THROTTLE_BPS_WRITE].avg = 410 qemu_opt_get_number(opts, "throttling.bps-write", 0); 411 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 412 qemu_opt_get_number(opts, "throttling.iops-total", 0); 413 cfg.buckets[THROTTLE_OPS_READ].avg = 414 qemu_opt_get_number(opts, "throttling.iops-read", 0); 415 cfg.buckets[THROTTLE_OPS_WRITE].avg = 416 qemu_opt_get_number(opts, "throttling.iops-write", 0); 417 418 cfg.buckets[THROTTLE_BPS_TOTAL].max = 419 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 420 cfg.buckets[THROTTLE_BPS_READ].max = 421 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 422 cfg.buckets[THROTTLE_BPS_WRITE].max = 423 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 424 cfg.buckets[THROTTLE_OPS_TOTAL].max = 425 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 426 cfg.buckets[THROTTLE_OPS_READ].max = 427 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 428 cfg.buckets[THROTTLE_OPS_WRITE].max = 429 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 430 431 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 432 433 if (!check_throttle_config(&cfg, &error)) { 434 error_propagate(errp, error); 435 goto early_err; 436 } 437 438 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 439 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 440 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 441 error_setg(errp, "werror is not supported by this bus type"); 442 goto early_err; 443 } 444 445 on_write_error = parse_block_error_action(buf, 0, &error); 446 if (error_is_set(&error)) { 447 error_propagate(errp, error); 448 goto early_err; 449 } 450 } 451 452 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 453 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 454 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 455 error_report("rerror is not supported by this bus type"); 456 goto early_err; 457 } 458 459 on_read_error = parse_block_error_action(buf, 1, &error); 460 if (error_is_set(&error)) { 461 error_propagate(errp, error); 462 goto early_err; 463 } 464 } 465 466 /* init */ 467 dinfo = g_malloc0(sizeof(*dinfo)); 468 dinfo->id = g_strdup(qemu_opts_id(opts)); 469 dinfo->bdrv = bdrv_new(dinfo->id); 470 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 471 dinfo->bdrv->read_only = ro; 472 dinfo->type = type; 473 dinfo->refcount = 1; 474 if (serial != NULL) { 475 dinfo->serial = g_strdup(serial); 476 } 477 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 478 479 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 480 481 /* disk I/O throttling */ 482 if (throttle_enabled(&cfg)) { 483 bdrv_io_limits_enable(dinfo->bdrv); 484 bdrv_set_io_limits(dinfo->bdrv, &cfg); 485 } 486 487 if (!file || !*file) { 488 if (has_driver_specific_opts) { 489 file = NULL; 490 } else { 491 QDECREF(bs_opts); 492 qemu_opts_del(opts); 493 return dinfo; 494 } 495 } 496 if (snapshot) { 497 /* always use cache=unsafe with snapshot */ 498 bdrv_flags &= ~BDRV_O_CACHE_MASK; 499 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 500 } 501 502 if (copy_on_read) { 503 bdrv_flags |= BDRV_O_COPY_ON_READ; 504 } 505 506 if (runstate_check(RUN_STATE_INMIGRATE)) { 507 bdrv_flags |= BDRV_O_INCOMING; 508 } 509 510 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 511 512 QINCREF(bs_opts); 513 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error); 514 515 if (ret < 0) { 516 error_setg(errp, "could not open disk image %s: %s", 517 file ?: dinfo->id, error_get_pretty(error)); 518 error_free(error); 519 goto err; 520 } 521 522 if (bdrv_key_required(dinfo->bdrv)) 523 autostart = 0; 524 525 QDECREF(bs_opts); 526 qemu_opts_del(opts); 527 528 return dinfo; 529 530 err: 531 bdrv_unref(dinfo->bdrv); 532 g_free(dinfo->id); 533 QTAILQ_REMOVE(&drives, dinfo, next); 534 g_free(dinfo); 535 early_err: 536 QDECREF(bs_opts); 537 qemu_opts_del(opts); 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 .name = "file", 602 .type = QEMU_OPT_STRING, 603 .help = "file name", 604 }, 605 606 /* Options that are passed on, but have special semantics with -drive */ 607 { 608 .name = "read-only", 609 .type = QEMU_OPT_BOOL, 610 .help = "open drive file as read-only", 611 },{ 612 .name = "copy-on-read", 613 .type = QEMU_OPT_BOOL, 614 .help = "copy read data from backing file into image file", 615 }, 616 617 { /* end of list */ } 618 }, 619 }; 620 621 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type) 622 { 623 const char *value; 624 DriveInfo *dinfo = NULL; 625 QDict *bs_opts; 626 QemuOpts *legacy_opts; 627 DriveMediaType media = MEDIA_DISK; 628 BlockInterfaceType type; 629 int cyls, heads, secs, translation; 630 int max_devs, bus_id, unit_id, index; 631 const char *devaddr; 632 bool read_only = false; 633 bool copy_on_read; 634 const char *filename; 635 Error *local_err = NULL; 636 637 /* Change legacy command line options into QMP ones */ 638 qemu_opt_rename(all_opts, "iops", "throttling.iops-total"); 639 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read"); 640 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write"); 641 642 qemu_opt_rename(all_opts, "bps", "throttling.bps-total"); 643 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read"); 644 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write"); 645 646 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max"); 647 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max"); 648 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max"); 649 650 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max"); 651 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max"); 652 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max"); 653 654 qemu_opt_rename(all_opts, 655 "iops_size", "throttling.iops-size"); 656 657 qemu_opt_rename(all_opts, "readonly", "read-only"); 658 659 value = qemu_opt_get(all_opts, "cache"); 660 if (value) { 661 int flags = 0; 662 663 if (bdrv_parse_cache_flags(value, &flags) != 0) { 664 error_report("invalid cache option"); 665 return NULL; 666 } 667 668 /* Specific options take precedence */ 669 if (!qemu_opt_get(all_opts, "cache.writeback")) { 670 qemu_opt_set_bool(all_opts, "cache.writeback", 671 !!(flags & BDRV_O_CACHE_WB)); 672 } 673 if (!qemu_opt_get(all_opts, "cache.direct")) { 674 qemu_opt_set_bool(all_opts, "cache.direct", 675 !!(flags & BDRV_O_NOCACHE)); 676 } 677 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 678 qemu_opt_set_bool(all_opts, "cache.no-flush", 679 !!(flags & BDRV_O_NO_FLUSH)); 680 } 681 qemu_opt_unset(all_opts, "cache"); 682 } 683 684 /* Get a QDict for processing the options */ 685 bs_opts = qdict_new(); 686 qemu_opts_to_qdict(all_opts, bs_opts); 687 688 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 689 &error_abort); 690 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 691 if (error_is_set(&local_err)) { 692 qerror_report_err(local_err); 693 error_free(local_err); 694 goto fail; 695 } 696 697 /* Deprecated option boot=[on|off] */ 698 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 699 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 700 "ignored. Future versions will reject this parameter. Please " 701 "update your scripts.\n"); 702 } 703 704 /* Media type */ 705 value = qemu_opt_get(legacy_opts, "media"); 706 if (value) { 707 if (!strcmp(value, "disk")) { 708 media = MEDIA_DISK; 709 } else if (!strcmp(value, "cdrom")) { 710 media = MEDIA_CDROM; 711 read_only = true; 712 } else { 713 error_report("'%s' invalid media", value); 714 goto fail; 715 } 716 } 717 718 /* copy-on-read is disabled with a warning for read-only devices */ 719 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 720 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 721 722 if (read_only && copy_on_read) { 723 error_report("warning: disabling copy-on-read on read-only drive"); 724 copy_on_read = false; 725 } 726 727 qdict_put(bs_opts, "read-only", 728 qstring_from_str(read_only ? "on" : "off")); 729 qdict_put(bs_opts, "copy-on-read", 730 qstring_from_str(copy_on_read ? "on" :"off")); 731 732 /* Controller type */ 733 value = qemu_opt_get(legacy_opts, "if"); 734 if (value) { 735 for (type = 0; 736 type < IF_COUNT && strcmp(value, if_name[type]); 737 type++) { 738 } 739 if (type == IF_COUNT) { 740 error_report("unsupported bus type '%s'", value); 741 goto fail; 742 } 743 } else { 744 type = block_default_type; 745 } 746 747 /* Geometry */ 748 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 749 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 750 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 751 752 if (cyls || heads || secs) { 753 if (cyls < 1) { 754 error_report("invalid physical cyls number"); 755 goto fail; 756 } 757 if (heads < 1) { 758 error_report("invalid physical heads number"); 759 goto fail; 760 } 761 if (secs < 1) { 762 error_report("invalid physical secs number"); 763 goto fail; 764 } 765 } 766 767 translation = BIOS_ATA_TRANSLATION_AUTO; 768 value = qemu_opt_get(legacy_opts, "trans"); 769 if (value != NULL) { 770 if (!cyls) { 771 error_report("'%s' trans must be used with cyls, heads and secs", 772 value); 773 goto fail; 774 } 775 if (!strcmp(value, "none")) { 776 translation = BIOS_ATA_TRANSLATION_NONE; 777 } else if (!strcmp(value, "lba")) { 778 translation = BIOS_ATA_TRANSLATION_LBA; 779 } else if (!strcmp(value, "auto")) { 780 translation = BIOS_ATA_TRANSLATION_AUTO; 781 } else { 782 error_report("'%s' invalid translation type", value); 783 goto fail; 784 } 785 } 786 787 if (media == MEDIA_CDROM) { 788 if (cyls || secs || heads) { 789 error_report("CHS can't be set with media=cdrom"); 790 goto fail; 791 } 792 } 793 794 /* Device address specified by bus/unit or index. 795 * If none was specified, try to find the first free one. */ 796 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 797 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 798 index = qemu_opt_get_number(legacy_opts, "index", -1); 799 800 max_devs = if_max_devs[type]; 801 802 if (index != -1) { 803 if (bus_id != 0 || unit_id != -1) { 804 error_report("index cannot be used with bus and unit"); 805 goto fail; 806 } 807 bus_id = drive_index_to_bus_id(type, index); 808 unit_id = drive_index_to_unit_id(type, index); 809 } 810 811 if (unit_id == -1) { 812 unit_id = 0; 813 while (drive_get(type, bus_id, unit_id) != NULL) { 814 unit_id++; 815 if (max_devs && unit_id >= max_devs) { 816 unit_id -= max_devs; 817 bus_id++; 818 } 819 } 820 } 821 822 if (max_devs && unit_id >= max_devs) { 823 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 824 goto fail; 825 } 826 827 if (drive_get(type, bus_id, unit_id) != NULL) { 828 error_report("drive with bus=%d, unit=%d (index=%d) exists", 829 bus_id, unit_id, index); 830 goto fail; 831 } 832 833 /* no id supplied -> create one */ 834 if (qemu_opts_id(all_opts) == NULL) { 835 char *new_id; 836 const char *mediastr = ""; 837 if (type == IF_IDE || type == IF_SCSI) { 838 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 839 } 840 if (max_devs) { 841 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 842 mediastr, unit_id); 843 } else { 844 new_id = g_strdup_printf("%s%s%i", if_name[type], 845 mediastr, unit_id); 846 } 847 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 848 g_free(new_id); 849 } 850 851 /* Add virtio block device */ 852 devaddr = qemu_opt_get(legacy_opts, "addr"); 853 if (devaddr && type != IF_VIRTIO) { 854 error_report("addr is not supported by this bus type"); 855 goto fail; 856 } 857 858 if (type == IF_VIRTIO) { 859 QemuOpts *devopts; 860 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 861 &error_abort); 862 if (arch_type == QEMU_ARCH_S390X) { 863 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 864 } else { 865 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 866 } 867 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 868 if (devaddr) { 869 qemu_opt_set(devopts, "addr", devaddr); 870 } 871 } 872 873 filename = qemu_opt_get(legacy_opts, "file"); 874 875 /* Actual block device init: Functionality shared with blockdev-add */ 876 dinfo = blockdev_init(filename, bs_opts, type, &local_err); 877 if (dinfo == NULL) { 878 if (error_is_set(&local_err)) { 879 qerror_report_err(local_err); 880 error_free(local_err); 881 } 882 goto fail; 883 } else { 884 assert(!error_is_set(&local_err)); 885 } 886 887 /* Set legacy DriveInfo fields */ 888 dinfo->enable_auto_del = true; 889 dinfo->opts = all_opts; 890 891 dinfo->cyls = cyls; 892 dinfo->heads = heads; 893 dinfo->secs = secs; 894 dinfo->trans = translation; 895 896 dinfo->bus = bus_id; 897 dinfo->unit = unit_id; 898 dinfo->devaddr = devaddr; 899 900 switch(type) { 901 case IF_IDE: 902 case IF_SCSI: 903 case IF_XEN: 904 case IF_NONE: 905 dinfo->media_cd = media == MEDIA_CDROM; 906 break; 907 default: 908 break; 909 } 910 911 fail: 912 qemu_opts_del(legacy_opts); 913 return dinfo; 914 } 915 916 void do_commit(Monitor *mon, const QDict *qdict) 917 { 918 const char *device = qdict_get_str(qdict, "device"); 919 BlockDriverState *bs; 920 int ret; 921 922 if (!strcmp(device, "all")) { 923 ret = bdrv_commit_all(); 924 } else { 925 bs = bdrv_find(device); 926 if (!bs) { 927 monitor_printf(mon, "Device '%s' not found\n", device); 928 return; 929 } 930 ret = bdrv_commit(bs); 931 } 932 if (ret < 0) { 933 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 934 strerror(-ret)); 935 } 936 } 937 938 static void blockdev_do_action(int kind, void *data, Error **errp) 939 { 940 TransactionAction action; 941 TransactionActionList list; 942 943 action.kind = kind; 944 action.data = data; 945 list.value = &action; 946 list.next = NULL; 947 qmp_transaction(&list, errp); 948 } 949 950 void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file, 951 bool has_format, const char *format, 952 bool has_mode, enum NewImageMode mode, 953 Error **errp) 954 { 955 BlockdevSnapshot snapshot = { 956 .device = (char *) device, 957 .snapshot_file = (char *) snapshot_file, 958 .has_format = has_format, 959 .format = (char *) format, 960 .has_mode = has_mode, 961 .mode = mode, 962 }; 963 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 964 &snapshot, errp); 965 } 966 967 void qmp_blockdev_snapshot_internal_sync(const char *device, 968 const char *name, 969 Error **errp) 970 { 971 BlockdevSnapshotInternal snapshot = { 972 .device = (char *) device, 973 .name = (char *) name 974 }; 975 976 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 977 &snapshot, errp); 978 } 979 980 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 981 bool has_id, 982 const char *id, 983 bool has_name, 984 const char *name, 985 Error **errp) 986 { 987 BlockDriverState *bs = bdrv_find(device); 988 QEMUSnapshotInfo sn; 989 Error *local_err = NULL; 990 SnapshotInfo *info = NULL; 991 int ret; 992 993 if (!bs) { 994 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 995 return NULL; 996 } 997 998 if (!has_id) { 999 id = NULL; 1000 } 1001 1002 if (!has_name) { 1003 name = NULL; 1004 } 1005 1006 if (!id && !name) { 1007 error_setg(errp, "Name or id must be provided"); 1008 return NULL; 1009 } 1010 1011 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1012 if (error_is_set(&local_err)) { 1013 error_propagate(errp, local_err); 1014 return NULL; 1015 } 1016 if (!ret) { 1017 error_setg(errp, 1018 "Snapshot with id '%s' and name '%s' does not exist on " 1019 "device '%s'", 1020 STR_OR_NULL(id), STR_OR_NULL(name), device); 1021 return NULL; 1022 } 1023 1024 bdrv_snapshot_delete(bs, id, name, &local_err); 1025 if (error_is_set(&local_err)) { 1026 error_propagate(errp, local_err); 1027 return NULL; 1028 } 1029 1030 info = g_malloc0(sizeof(SnapshotInfo)); 1031 info->id = g_strdup(sn.id_str); 1032 info->name = g_strdup(sn.name); 1033 info->date_nsec = sn.date_nsec; 1034 info->date_sec = sn.date_sec; 1035 info->vm_state_size = sn.vm_state_size; 1036 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1037 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1038 1039 return info; 1040 } 1041 1042 /* New and old BlockDriverState structs for group snapshots */ 1043 1044 typedef struct BlkTransactionState BlkTransactionState; 1045 1046 /* Only prepare() may fail. In a single transaction, only one of commit() or 1047 abort() will be called, clean() will always be called if it present. */ 1048 typedef struct BdrvActionOps { 1049 /* Size of state struct, in bytes. */ 1050 size_t instance_size; 1051 /* Prepare the work, must NOT be NULL. */ 1052 void (*prepare)(BlkTransactionState *common, Error **errp); 1053 /* Commit the changes, can be NULL. */ 1054 void (*commit)(BlkTransactionState *common); 1055 /* Abort the changes on fail, can be NULL. */ 1056 void (*abort)(BlkTransactionState *common); 1057 /* Clean up resource in the end, can be NULL. */ 1058 void (*clean)(BlkTransactionState *common); 1059 } BdrvActionOps; 1060 1061 /* 1062 * This structure must be arranged as first member in child type, assuming 1063 * that compiler will also arrange it to the same address with parent instance. 1064 * Later it will be used in free(). 1065 */ 1066 struct BlkTransactionState { 1067 TransactionAction *action; 1068 const BdrvActionOps *ops; 1069 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1070 }; 1071 1072 /* internal snapshot private data */ 1073 typedef struct InternalSnapshotState { 1074 BlkTransactionState common; 1075 BlockDriverState *bs; 1076 QEMUSnapshotInfo sn; 1077 } InternalSnapshotState; 1078 1079 static void internal_snapshot_prepare(BlkTransactionState *common, 1080 Error **errp) 1081 { 1082 const char *device; 1083 const char *name; 1084 BlockDriverState *bs; 1085 QEMUSnapshotInfo old_sn, *sn; 1086 bool ret; 1087 qemu_timeval tv; 1088 BlockdevSnapshotInternal *internal; 1089 InternalSnapshotState *state; 1090 int ret1; 1091 1092 g_assert(common->action->kind == 1093 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1094 internal = common->action->blockdev_snapshot_internal_sync; 1095 state = DO_UPCAST(InternalSnapshotState, common, common); 1096 1097 /* 1. parse input */ 1098 device = internal->device; 1099 name = internal->name; 1100 1101 /* 2. check for validation */ 1102 bs = bdrv_find(device); 1103 if (!bs) { 1104 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1105 return; 1106 } 1107 1108 if (!bdrv_is_inserted(bs)) { 1109 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1110 return; 1111 } 1112 1113 if (bdrv_is_read_only(bs)) { 1114 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1115 return; 1116 } 1117 1118 if (!bdrv_can_snapshot(bs)) { 1119 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1120 bs->drv->format_name, device, "internal snapshot"); 1121 return; 1122 } 1123 1124 if (!strlen(name)) { 1125 error_setg(errp, "Name is empty"); 1126 return; 1127 } 1128 1129 /* check whether a snapshot with name exist */ 1130 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp); 1131 if (error_is_set(errp)) { 1132 return; 1133 } else if (ret) { 1134 error_setg(errp, 1135 "Snapshot with name '%s' already exists on device '%s'", 1136 name, device); 1137 return; 1138 } 1139 1140 /* 3. take the snapshot */ 1141 sn = &state->sn; 1142 pstrcpy(sn->name, sizeof(sn->name), name); 1143 qemu_gettimeofday(&tv); 1144 sn->date_sec = tv.tv_sec; 1145 sn->date_nsec = tv.tv_usec * 1000; 1146 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1147 1148 ret1 = bdrv_snapshot_create(bs, sn); 1149 if (ret1 < 0) { 1150 error_setg_errno(errp, -ret1, 1151 "Failed to create snapshot '%s' on device '%s'", 1152 name, device); 1153 return; 1154 } 1155 1156 /* 4. succeed, mark a snapshot is created */ 1157 state->bs = bs; 1158 } 1159 1160 static void internal_snapshot_abort(BlkTransactionState *common) 1161 { 1162 InternalSnapshotState *state = 1163 DO_UPCAST(InternalSnapshotState, common, common); 1164 BlockDriverState *bs = state->bs; 1165 QEMUSnapshotInfo *sn = &state->sn; 1166 Error *local_error = NULL; 1167 1168 if (!bs) { 1169 return; 1170 } 1171 1172 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1173 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1174 "device '%s' in abort: %s", 1175 sn->id_str, 1176 sn->name, 1177 bdrv_get_device_name(bs), 1178 error_get_pretty(local_error)); 1179 error_free(local_error); 1180 } 1181 } 1182 1183 /* external snapshot private data */ 1184 typedef struct ExternalSnapshotState { 1185 BlkTransactionState common; 1186 BlockDriverState *old_bs; 1187 BlockDriverState *new_bs; 1188 } ExternalSnapshotState; 1189 1190 static void external_snapshot_prepare(BlkTransactionState *common, 1191 Error **errp) 1192 { 1193 BlockDriver *drv; 1194 int flags, ret; 1195 Error *local_err = NULL; 1196 const char *device; 1197 const char *new_image_file; 1198 const char *format = "qcow2"; 1199 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1200 ExternalSnapshotState *state = 1201 DO_UPCAST(ExternalSnapshotState, common, common); 1202 TransactionAction *action = common->action; 1203 1204 /* get parameters */ 1205 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1206 1207 device = action->blockdev_snapshot_sync->device; 1208 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1209 if (action->blockdev_snapshot_sync->has_format) { 1210 format = action->blockdev_snapshot_sync->format; 1211 } 1212 if (action->blockdev_snapshot_sync->has_mode) { 1213 mode = action->blockdev_snapshot_sync->mode; 1214 } 1215 1216 /* start processing */ 1217 drv = bdrv_find_format(format); 1218 if (!drv) { 1219 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1220 return; 1221 } 1222 1223 state->old_bs = bdrv_find(device); 1224 if (!state->old_bs) { 1225 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1226 return; 1227 } 1228 1229 if (!bdrv_is_inserted(state->old_bs)) { 1230 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1231 return; 1232 } 1233 1234 if (bdrv_in_use(state->old_bs)) { 1235 error_set(errp, QERR_DEVICE_IN_USE, device); 1236 return; 1237 } 1238 1239 if (!bdrv_is_read_only(state->old_bs)) { 1240 if (bdrv_flush(state->old_bs)) { 1241 error_set(errp, QERR_IO_ERROR); 1242 return; 1243 } 1244 } 1245 1246 if (bdrv_check_ext_snapshot(state->old_bs) != EXT_SNAPSHOT_ALLOWED) { 1247 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1248 return; 1249 } 1250 1251 flags = state->old_bs->open_flags; 1252 1253 /* create new image w/backing file */ 1254 if (mode != NEW_IMAGE_MODE_EXISTING) { 1255 bdrv_img_create(new_image_file, format, 1256 state->old_bs->filename, 1257 state->old_bs->drv->format_name, 1258 NULL, -1, flags, &local_err, false); 1259 if (error_is_set(&local_err)) { 1260 error_propagate(errp, local_err); 1261 return; 1262 } 1263 } 1264 1265 /* We will manually add the backing_hd field to the bs later */ 1266 state->new_bs = bdrv_new(""); 1267 /* TODO Inherit bs->options or only take explicit options with an 1268 * extended QMP command? */ 1269 ret = bdrv_open(state->new_bs, new_image_file, NULL, 1270 flags | BDRV_O_NO_BACKING, drv, &local_err); 1271 if (ret != 0) { 1272 error_propagate(errp, local_err); 1273 } 1274 } 1275 1276 static void external_snapshot_commit(BlkTransactionState *common) 1277 { 1278 ExternalSnapshotState *state = 1279 DO_UPCAST(ExternalSnapshotState, common, common); 1280 1281 /* This removes our old bs and adds the new bs */ 1282 bdrv_append(state->new_bs, state->old_bs); 1283 /* We don't need (or want) to use the transactional 1284 * bdrv_reopen_multiple() across all the entries at once, because we 1285 * don't want to abort all of them if one of them fails the reopen */ 1286 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1287 NULL); 1288 } 1289 1290 static void external_snapshot_abort(BlkTransactionState *common) 1291 { 1292 ExternalSnapshotState *state = 1293 DO_UPCAST(ExternalSnapshotState, common, common); 1294 if (state->new_bs) { 1295 bdrv_unref(state->new_bs); 1296 } 1297 } 1298 1299 typedef struct DriveBackupState { 1300 BlkTransactionState common; 1301 BlockDriverState *bs; 1302 BlockJob *job; 1303 } DriveBackupState; 1304 1305 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1306 { 1307 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1308 DriveBackup *backup; 1309 Error *local_err = NULL; 1310 1311 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1312 backup = common->action->drive_backup; 1313 1314 qmp_drive_backup(backup->device, backup->target, 1315 backup->has_format, backup->format, 1316 backup->sync, 1317 backup->has_mode, backup->mode, 1318 backup->has_speed, backup->speed, 1319 backup->has_on_source_error, backup->on_source_error, 1320 backup->has_on_target_error, backup->on_target_error, 1321 &local_err); 1322 if (error_is_set(&local_err)) { 1323 error_propagate(errp, local_err); 1324 state->bs = NULL; 1325 state->job = NULL; 1326 return; 1327 } 1328 1329 state->bs = bdrv_find(backup->device); 1330 state->job = state->bs->job; 1331 } 1332 1333 static void drive_backup_abort(BlkTransactionState *common) 1334 { 1335 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1336 BlockDriverState *bs = state->bs; 1337 1338 /* Only cancel if it's the job we started */ 1339 if (bs && bs->job && bs->job == state->job) { 1340 block_job_cancel_sync(bs->job); 1341 } 1342 } 1343 1344 static void abort_prepare(BlkTransactionState *common, Error **errp) 1345 { 1346 error_setg(errp, "Transaction aborted using Abort action"); 1347 } 1348 1349 static void abort_commit(BlkTransactionState *common) 1350 { 1351 g_assert_not_reached(); /* this action never succeeds */ 1352 } 1353 1354 static const BdrvActionOps actions[] = { 1355 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1356 .instance_size = sizeof(ExternalSnapshotState), 1357 .prepare = external_snapshot_prepare, 1358 .commit = external_snapshot_commit, 1359 .abort = external_snapshot_abort, 1360 }, 1361 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1362 .instance_size = sizeof(DriveBackupState), 1363 .prepare = drive_backup_prepare, 1364 .abort = drive_backup_abort, 1365 }, 1366 [TRANSACTION_ACTION_KIND_ABORT] = { 1367 .instance_size = sizeof(BlkTransactionState), 1368 .prepare = abort_prepare, 1369 .commit = abort_commit, 1370 }, 1371 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1372 .instance_size = sizeof(InternalSnapshotState), 1373 .prepare = internal_snapshot_prepare, 1374 .abort = internal_snapshot_abort, 1375 }, 1376 }; 1377 1378 /* 1379 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1380 * then we do not pivot any of the devices in the group, and abandon the 1381 * snapshots 1382 */ 1383 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1384 { 1385 TransactionActionList *dev_entry = dev_list; 1386 BlkTransactionState *state, *next; 1387 Error *local_err = NULL; 1388 1389 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1390 QSIMPLEQ_INIT(&snap_bdrv_states); 1391 1392 /* drain all i/o before any snapshots */ 1393 bdrv_drain_all(); 1394 1395 /* We don't do anything in this loop that commits us to the snapshot */ 1396 while (NULL != dev_entry) { 1397 TransactionAction *dev_info = NULL; 1398 const BdrvActionOps *ops; 1399 1400 dev_info = dev_entry->value; 1401 dev_entry = dev_entry->next; 1402 1403 assert(dev_info->kind < ARRAY_SIZE(actions)); 1404 1405 ops = &actions[dev_info->kind]; 1406 assert(ops->instance_size > 0); 1407 1408 state = g_malloc0(ops->instance_size); 1409 state->ops = ops; 1410 state->action = dev_info; 1411 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1412 1413 state->ops->prepare(state, &local_err); 1414 if (error_is_set(&local_err)) { 1415 error_propagate(errp, local_err); 1416 goto delete_and_fail; 1417 } 1418 } 1419 1420 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1421 if (state->ops->commit) { 1422 state->ops->commit(state); 1423 } 1424 } 1425 1426 /* success */ 1427 goto exit; 1428 1429 delete_and_fail: 1430 /* 1431 * failure, and it is all-or-none; abandon each new bs, and keep using 1432 * the original bs for all images 1433 */ 1434 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1435 if (state->ops->abort) { 1436 state->ops->abort(state); 1437 } 1438 } 1439 exit: 1440 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1441 if (state->ops->clean) { 1442 state->ops->clean(state); 1443 } 1444 g_free(state); 1445 } 1446 } 1447 1448 1449 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1450 { 1451 if (bdrv_in_use(bs)) { 1452 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1453 return; 1454 } 1455 if (!bdrv_dev_has_removable_media(bs)) { 1456 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 1457 return; 1458 } 1459 1460 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1461 bdrv_dev_eject_request(bs, force); 1462 if (!force) { 1463 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 1464 return; 1465 } 1466 } 1467 1468 bdrv_close(bs); 1469 } 1470 1471 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1472 { 1473 BlockDriverState *bs; 1474 1475 bs = bdrv_find(device); 1476 if (!bs) { 1477 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1478 return; 1479 } 1480 1481 eject_device(bs, force, errp); 1482 } 1483 1484 void qmp_block_passwd(const char *device, const char *password, Error **errp) 1485 { 1486 BlockDriverState *bs; 1487 int err; 1488 1489 bs = bdrv_find(device); 1490 if (!bs) { 1491 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1492 return; 1493 } 1494 1495 err = bdrv_set_key(bs, password); 1496 if (err == -EINVAL) { 1497 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1498 return; 1499 } else if (err < 0) { 1500 error_set(errp, QERR_INVALID_PASSWORD); 1501 return; 1502 } 1503 } 1504 1505 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1506 int bdrv_flags, BlockDriver *drv, 1507 const char *password, Error **errp) 1508 { 1509 Error *local_err = NULL; 1510 int ret; 1511 1512 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err); 1513 if (ret < 0) { 1514 error_propagate(errp, local_err); 1515 return; 1516 } 1517 1518 if (bdrv_key_required(bs)) { 1519 if (password) { 1520 if (bdrv_set_key(bs, password) < 0) { 1521 error_set(errp, QERR_INVALID_PASSWORD); 1522 } 1523 } else { 1524 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1525 bdrv_get_encrypted_filename(bs)); 1526 } 1527 } else if (password) { 1528 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1529 } 1530 } 1531 1532 void qmp_change_blockdev(const char *device, const char *filename, 1533 const char *format, Error **errp) 1534 { 1535 BlockDriverState *bs; 1536 BlockDriver *drv = NULL; 1537 int bdrv_flags; 1538 Error *err = NULL; 1539 1540 bs = bdrv_find(device); 1541 if (!bs) { 1542 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1543 return; 1544 } 1545 1546 if (format) { 1547 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1548 if (!drv) { 1549 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1550 return; 1551 } 1552 } 1553 1554 eject_device(bs, 0, &err); 1555 if (error_is_set(&err)) { 1556 error_propagate(errp, err); 1557 return; 1558 } 1559 1560 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1561 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1562 1563 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1564 } 1565 1566 /* throttling disk I/O limits */ 1567 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1568 int64_t bps_wr, 1569 int64_t iops, 1570 int64_t iops_rd, 1571 int64_t iops_wr, 1572 bool has_bps_max, 1573 int64_t bps_max, 1574 bool has_bps_rd_max, 1575 int64_t bps_rd_max, 1576 bool has_bps_wr_max, 1577 int64_t bps_wr_max, 1578 bool has_iops_max, 1579 int64_t iops_max, 1580 bool has_iops_rd_max, 1581 int64_t iops_rd_max, 1582 bool has_iops_wr_max, 1583 int64_t iops_wr_max, 1584 bool has_iops_size, 1585 int64_t iops_size, Error **errp) 1586 { 1587 ThrottleConfig cfg; 1588 BlockDriverState *bs; 1589 1590 bs = bdrv_find(device); 1591 if (!bs) { 1592 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1593 return; 1594 } 1595 1596 memset(&cfg, 0, sizeof(cfg)); 1597 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1598 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1599 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1600 1601 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1602 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1603 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1604 1605 if (has_bps_max) { 1606 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1607 } 1608 if (has_bps_rd_max) { 1609 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1610 } 1611 if (has_bps_wr_max) { 1612 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1613 } 1614 if (has_iops_max) { 1615 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1616 } 1617 if (has_iops_rd_max) { 1618 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1619 } 1620 if (has_iops_wr_max) { 1621 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1622 } 1623 1624 if (has_iops_size) { 1625 cfg.op_size = iops_size; 1626 } 1627 1628 if (!check_throttle_config(&cfg, errp)) { 1629 return; 1630 } 1631 1632 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1633 bdrv_io_limits_enable(bs); 1634 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1635 bdrv_io_limits_disable(bs); 1636 } 1637 1638 if (bs->io_limits_enabled) { 1639 bdrv_set_io_limits(bs, &cfg); 1640 } 1641 } 1642 1643 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1644 { 1645 const char *id = qdict_get_str(qdict, "id"); 1646 BlockDriverState *bs; 1647 1648 bs = bdrv_find(id); 1649 if (!bs) { 1650 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1651 return -1; 1652 } 1653 if (bdrv_in_use(bs)) { 1654 qerror_report(QERR_DEVICE_IN_USE, id); 1655 return -1; 1656 } 1657 1658 /* quiesce block driver; prevent further io */ 1659 bdrv_drain_all(); 1660 bdrv_flush(bs); 1661 bdrv_close(bs); 1662 1663 /* if we have a device attached to this BlockDriverState 1664 * then we need to make the drive anonymous until the device 1665 * can be removed. If this is a drive with no device backing 1666 * then we can just get rid of the block driver state right here. 1667 */ 1668 if (bdrv_get_attached_dev(bs)) { 1669 bdrv_make_anon(bs); 1670 1671 /* Further I/O must not pause the guest */ 1672 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1673 BLOCKDEV_ON_ERROR_REPORT); 1674 } else { 1675 drive_uninit(drive_get_by_blockdev(bs)); 1676 } 1677 1678 return 0; 1679 } 1680 1681 void qmp_block_resize(const char *device, int64_t size, Error **errp) 1682 { 1683 BlockDriverState *bs; 1684 int ret; 1685 1686 bs = bdrv_find(device); 1687 if (!bs) { 1688 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1689 return; 1690 } 1691 1692 if (size < 0) { 1693 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1694 return; 1695 } 1696 1697 /* complete all in-flight operations before resizing the device */ 1698 bdrv_drain_all(); 1699 1700 ret = bdrv_truncate(bs, size); 1701 switch (ret) { 1702 case 0: 1703 break; 1704 case -ENOMEDIUM: 1705 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1706 break; 1707 case -ENOTSUP: 1708 error_set(errp, QERR_UNSUPPORTED); 1709 break; 1710 case -EACCES: 1711 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1712 break; 1713 case -EBUSY: 1714 error_set(errp, QERR_DEVICE_IN_USE, device); 1715 break; 1716 default: 1717 error_setg_errno(errp, -ret, "Could not resize"); 1718 break; 1719 } 1720 } 1721 1722 static void block_job_cb(void *opaque, int ret) 1723 { 1724 BlockDriverState *bs = opaque; 1725 QObject *obj; 1726 1727 trace_block_job_cb(bs, bs->job, ret); 1728 1729 assert(bs->job); 1730 obj = qobject_from_block_job(bs->job); 1731 if (ret < 0) { 1732 QDict *dict = qobject_to_qdict(obj); 1733 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1734 } 1735 1736 if (block_job_is_cancelled(bs->job)) { 1737 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1738 } else { 1739 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1740 } 1741 qobject_decref(obj); 1742 1743 bdrv_put_ref_bh_schedule(bs); 1744 } 1745 1746 void qmp_block_stream(const char *device, bool has_base, 1747 const char *base, bool has_speed, int64_t speed, 1748 bool has_on_error, BlockdevOnError on_error, 1749 Error **errp) 1750 { 1751 BlockDriverState *bs; 1752 BlockDriverState *base_bs = NULL; 1753 Error *local_err = NULL; 1754 1755 if (!has_on_error) { 1756 on_error = BLOCKDEV_ON_ERROR_REPORT; 1757 } 1758 1759 bs = bdrv_find(device); 1760 if (!bs) { 1761 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1762 return; 1763 } 1764 1765 if (base) { 1766 base_bs = bdrv_find_backing_image(bs, base); 1767 if (base_bs == NULL) { 1768 error_set(errp, QERR_BASE_NOT_FOUND, base); 1769 return; 1770 } 1771 } 1772 1773 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1774 on_error, block_job_cb, bs, &local_err); 1775 if (error_is_set(&local_err)) { 1776 error_propagate(errp, local_err); 1777 return; 1778 } 1779 1780 trace_qmp_block_stream(bs, bs->job); 1781 } 1782 1783 void qmp_block_commit(const char *device, 1784 bool has_base, const char *base, const char *top, 1785 bool has_speed, int64_t speed, 1786 Error **errp) 1787 { 1788 BlockDriverState *bs; 1789 BlockDriverState *base_bs, *top_bs; 1790 Error *local_err = NULL; 1791 /* This will be part of the QMP command, if/when the 1792 * BlockdevOnError change for blkmirror makes it in 1793 */ 1794 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1795 1796 /* drain all i/o before commits */ 1797 bdrv_drain_all(); 1798 1799 bs = bdrv_find(device); 1800 if (!bs) { 1801 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1802 return; 1803 } 1804 1805 /* default top_bs is the active layer */ 1806 top_bs = bs; 1807 1808 if (top) { 1809 if (strcmp(bs->filename, top) != 0) { 1810 top_bs = bdrv_find_backing_image(bs, top); 1811 } 1812 } 1813 1814 if (top_bs == NULL) { 1815 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1816 return; 1817 } 1818 1819 if (has_base && base) { 1820 base_bs = bdrv_find_backing_image(top_bs, base); 1821 } else { 1822 base_bs = bdrv_find_base(top_bs); 1823 } 1824 1825 if (base_bs == NULL) { 1826 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1827 return; 1828 } 1829 1830 if (top_bs == bs) { 1831 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 1832 bs, &local_err); 1833 } else { 1834 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1835 &local_err); 1836 } 1837 if (local_err != NULL) { 1838 error_propagate(errp, local_err); 1839 return; 1840 } 1841 } 1842 1843 void qmp_drive_backup(const char *device, const char *target, 1844 bool has_format, const char *format, 1845 enum MirrorSyncMode sync, 1846 bool has_mode, enum NewImageMode mode, 1847 bool has_speed, int64_t speed, 1848 bool has_on_source_error, BlockdevOnError on_source_error, 1849 bool has_on_target_error, BlockdevOnError on_target_error, 1850 Error **errp) 1851 { 1852 BlockDriverState *bs; 1853 BlockDriverState *target_bs; 1854 BlockDriverState *source = NULL; 1855 BlockDriver *drv = NULL; 1856 Error *local_err = NULL; 1857 int flags; 1858 int64_t size; 1859 int ret; 1860 1861 if (!has_speed) { 1862 speed = 0; 1863 } 1864 if (!has_on_source_error) { 1865 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1866 } 1867 if (!has_on_target_error) { 1868 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1869 } 1870 if (!has_mode) { 1871 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1872 } 1873 1874 bs = bdrv_find(device); 1875 if (!bs) { 1876 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1877 return; 1878 } 1879 1880 if (!bdrv_is_inserted(bs)) { 1881 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1882 return; 1883 } 1884 1885 if (!has_format) { 1886 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1887 } 1888 if (format) { 1889 drv = bdrv_find_format(format); 1890 if (!drv) { 1891 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1892 return; 1893 } 1894 } 1895 1896 if (bdrv_in_use(bs)) { 1897 error_set(errp, QERR_DEVICE_IN_USE, device); 1898 return; 1899 } 1900 1901 flags = bs->open_flags | BDRV_O_RDWR; 1902 1903 /* See if we have a backing HD we can use to create our new image 1904 * on top of. */ 1905 if (sync == MIRROR_SYNC_MODE_TOP) { 1906 source = bs->backing_hd; 1907 if (!source) { 1908 sync = MIRROR_SYNC_MODE_FULL; 1909 } 1910 } 1911 if (sync == MIRROR_SYNC_MODE_NONE) { 1912 source = bs; 1913 } 1914 1915 size = bdrv_getlength(bs); 1916 if (size < 0) { 1917 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1918 return; 1919 } 1920 1921 if (mode != NEW_IMAGE_MODE_EXISTING) { 1922 assert(format && drv); 1923 if (source) { 1924 bdrv_img_create(target, format, source->filename, 1925 source->drv->format_name, NULL, 1926 size, flags, &local_err, false); 1927 } else { 1928 bdrv_img_create(target, format, NULL, NULL, NULL, 1929 size, flags, &local_err, false); 1930 } 1931 } 1932 1933 if (error_is_set(&local_err)) { 1934 error_propagate(errp, local_err); 1935 return; 1936 } 1937 1938 target_bs = bdrv_new(""); 1939 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err); 1940 if (ret < 0) { 1941 bdrv_unref(target_bs); 1942 error_propagate(errp, local_err); 1943 return; 1944 } 1945 1946 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 1947 block_job_cb, bs, &local_err); 1948 if (local_err != NULL) { 1949 bdrv_unref(target_bs); 1950 error_propagate(errp, local_err); 1951 return; 1952 } 1953 } 1954 1955 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 1956 { 1957 return bdrv_named_nodes_list(); 1958 } 1959 1960 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 1961 1962 void qmp_drive_mirror(const char *device, const char *target, 1963 bool has_format, const char *format, 1964 enum MirrorSyncMode sync, 1965 bool has_mode, enum NewImageMode mode, 1966 bool has_speed, int64_t speed, 1967 bool has_granularity, uint32_t granularity, 1968 bool has_buf_size, int64_t buf_size, 1969 bool has_on_source_error, BlockdevOnError on_source_error, 1970 bool has_on_target_error, BlockdevOnError on_target_error, 1971 Error **errp) 1972 { 1973 BlockDriverState *bs; 1974 BlockDriverState *source, *target_bs; 1975 BlockDriver *drv = NULL; 1976 Error *local_err = NULL; 1977 int flags; 1978 int64_t size; 1979 int ret; 1980 1981 if (!has_speed) { 1982 speed = 0; 1983 } 1984 if (!has_on_source_error) { 1985 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1986 } 1987 if (!has_on_target_error) { 1988 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1989 } 1990 if (!has_mode) { 1991 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1992 } 1993 if (!has_granularity) { 1994 granularity = 0; 1995 } 1996 if (!has_buf_size) { 1997 buf_size = DEFAULT_MIRROR_BUF_SIZE; 1998 } 1999 2000 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2001 error_set(errp, QERR_INVALID_PARAMETER, device); 2002 return; 2003 } 2004 if (granularity & (granularity - 1)) { 2005 error_set(errp, QERR_INVALID_PARAMETER, device); 2006 return; 2007 } 2008 2009 bs = bdrv_find(device); 2010 if (!bs) { 2011 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2012 return; 2013 } 2014 2015 if (!bdrv_is_inserted(bs)) { 2016 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2017 return; 2018 } 2019 2020 if (!has_format) { 2021 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2022 } 2023 if (format) { 2024 drv = bdrv_find_format(format); 2025 if (!drv) { 2026 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2027 return; 2028 } 2029 } 2030 2031 if (bdrv_in_use(bs)) { 2032 error_set(errp, QERR_DEVICE_IN_USE, device); 2033 return; 2034 } 2035 2036 flags = bs->open_flags | BDRV_O_RDWR; 2037 source = bs->backing_hd; 2038 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2039 sync = MIRROR_SYNC_MODE_FULL; 2040 } 2041 if (sync == MIRROR_SYNC_MODE_NONE) { 2042 source = bs; 2043 } 2044 2045 size = bdrv_getlength(bs); 2046 if (size < 0) { 2047 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2048 return; 2049 } 2050 2051 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2052 && mode != NEW_IMAGE_MODE_EXISTING) 2053 { 2054 /* create new image w/o backing file */ 2055 assert(format && drv); 2056 bdrv_img_create(target, format, 2057 NULL, NULL, NULL, size, flags, &local_err, false); 2058 } else { 2059 switch (mode) { 2060 case NEW_IMAGE_MODE_EXISTING: 2061 break; 2062 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2063 /* create new image with backing file */ 2064 bdrv_img_create(target, format, 2065 source->filename, 2066 source->drv->format_name, 2067 NULL, size, flags, &local_err, false); 2068 break; 2069 default: 2070 abort(); 2071 } 2072 } 2073 2074 if (error_is_set(&local_err)) { 2075 error_propagate(errp, local_err); 2076 return; 2077 } 2078 2079 /* Mirroring takes care of copy-on-write using the source's backing 2080 * file. 2081 */ 2082 target_bs = bdrv_new(""); 2083 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv, 2084 &local_err); 2085 if (ret < 0) { 2086 bdrv_unref(target_bs); 2087 error_propagate(errp, local_err); 2088 return; 2089 } 2090 2091 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 2092 on_source_error, on_target_error, 2093 block_job_cb, bs, &local_err); 2094 if (local_err != NULL) { 2095 bdrv_unref(target_bs); 2096 error_propagate(errp, local_err); 2097 return; 2098 } 2099 } 2100 2101 static BlockJob *find_block_job(const char *device) 2102 { 2103 BlockDriverState *bs; 2104 2105 bs = bdrv_find(device); 2106 if (!bs || !bs->job) { 2107 return NULL; 2108 } 2109 return bs->job; 2110 } 2111 2112 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2113 { 2114 BlockJob *job = find_block_job(device); 2115 2116 if (!job) { 2117 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2118 return; 2119 } 2120 2121 block_job_set_speed(job, speed, errp); 2122 } 2123 2124 void qmp_block_job_cancel(const char *device, 2125 bool has_force, bool force, Error **errp) 2126 { 2127 BlockJob *job = find_block_job(device); 2128 2129 if (!has_force) { 2130 force = false; 2131 } 2132 2133 if (!job) { 2134 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2135 return; 2136 } 2137 if (job->paused && !force) { 2138 error_set(errp, QERR_BLOCK_JOB_PAUSED, device); 2139 return; 2140 } 2141 2142 trace_qmp_block_job_cancel(job); 2143 block_job_cancel(job); 2144 } 2145 2146 void qmp_block_job_pause(const char *device, Error **errp) 2147 { 2148 BlockJob *job = find_block_job(device); 2149 2150 if (!job) { 2151 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2152 return; 2153 } 2154 2155 trace_qmp_block_job_pause(job); 2156 block_job_pause(job); 2157 } 2158 2159 void qmp_block_job_resume(const char *device, Error **errp) 2160 { 2161 BlockJob *job = find_block_job(device); 2162 2163 if (!job) { 2164 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2165 return; 2166 } 2167 2168 trace_qmp_block_job_resume(job); 2169 block_job_resume(job); 2170 } 2171 2172 void qmp_block_job_complete(const char *device, Error **errp) 2173 { 2174 BlockJob *job = find_block_job(device); 2175 2176 if (!job) { 2177 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2178 return; 2179 } 2180 2181 trace_qmp_block_job_complete(job); 2182 block_job_complete(job, errp); 2183 } 2184 2185 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2186 { 2187 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2188 QObject *obj; 2189 QDict *qdict; 2190 Error *local_err = NULL; 2191 2192 /* Require an ID in the top level */ 2193 if (!options->has_id) { 2194 error_setg(errp, "Block device needs an ID"); 2195 goto fail; 2196 } 2197 2198 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with 2199 * cache.direct=false instead of silently switching to aio=threads, except 2200 * if called from drive_init. 2201 * 2202 * For now, simply forbidding the combination for all drivers will do. */ 2203 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2204 bool direct = options->cache->has_direct && options->cache->direct; 2205 if (!options->has_cache && !direct) { 2206 error_setg(errp, "aio=native requires cache.direct=true"); 2207 goto fail; 2208 } 2209 } 2210 2211 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2212 &options, NULL, &local_err); 2213 if (error_is_set(&local_err)) { 2214 error_propagate(errp, local_err); 2215 goto fail; 2216 } 2217 2218 obj = qmp_output_get_qobject(ov); 2219 qdict = qobject_to_qdict(obj); 2220 2221 qdict_flatten(qdict); 2222 2223 blockdev_init(NULL, qdict, IF_NONE, &local_err); 2224 if (error_is_set(&local_err)) { 2225 error_propagate(errp, local_err); 2226 goto fail; 2227 } 2228 2229 fail: 2230 qmp_output_visitor_cleanup(ov); 2231 } 2232 2233 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 2234 { 2235 BlockJobInfoList **prev = opaque; 2236 BlockJob *job = bs->job; 2237 2238 if (job) { 2239 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2240 elem->value = block_job_query(bs->job); 2241 (*prev)->next = elem; 2242 *prev = elem; 2243 } 2244 } 2245 2246 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2247 { 2248 /* Dummy is a fake list element for holding the head pointer */ 2249 BlockJobInfoList dummy = {}; 2250 BlockJobInfoList *prev = &dummy; 2251 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 2252 return dummy.next; 2253 } 2254 2255 QemuOptsList qemu_common_drive_opts = { 2256 .name = "drive", 2257 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2258 .desc = { 2259 { 2260 .name = "snapshot", 2261 .type = QEMU_OPT_BOOL, 2262 .help = "enable/disable snapshot mode", 2263 },{ 2264 .name = "discard", 2265 .type = QEMU_OPT_STRING, 2266 .help = "discard operation (ignore/off, unmap/on)", 2267 },{ 2268 .name = "cache.writeback", 2269 .type = QEMU_OPT_BOOL, 2270 .help = "enables writeback mode for any caches", 2271 },{ 2272 .name = "cache.direct", 2273 .type = QEMU_OPT_BOOL, 2274 .help = "enables use of O_DIRECT (bypass the host page cache)", 2275 },{ 2276 .name = "cache.no-flush", 2277 .type = QEMU_OPT_BOOL, 2278 .help = "ignore any flush requests for the device", 2279 },{ 2280 .name = "aio", 2281 .type = QEMU_OPT_STRING, 2282 .help = "host AIO implementation (threads, native)", 2283 },{ 2284 .name = "format", 2285 .type = QEMU_OPT_STRING, 2286 .help = "disk format (raw, qcow2, ...)", 2287 },{ 2288 .name = "serial", 2289 .type = QEMU_OPT_STRING, 2290 .help = "disk serial number", 2291 },{ 2292 .name = "rerror", 2293 .type = QEMU_OPT_STRING, 2294 .help = "read error action", 2295 },{ 2296 .name = "werror", 2297 .type = QEMU_OPT_STRING, 2298 .help = "write error action", 2299 },{ 2300 .name = "read-only", 2301 .type = QEMU_OPT_BOOL, 2302 .help = "open drive file as read-only", 2303 },{ 2304 .name = "throttling.iops-total", 2305 .type = QEMU_OPT_NUMBER, 2306 .help = "limit total I/O operations per second", 2307 },{ 2308 .name = "throttling.iops-read", 2309 .type = QEMU_OPT_NUMBER, 2310 .help = "limit read operations per second", 2311 },{ 2312 .name = "throttling.iops-write", 2313 .type = QEMU_OPT_NUMBER, 2314 .help = "limit write operations per second", 2315 },{ 2316 .name = "throttling.bps-total", 2317 .type = QEMU_OPT_NUMBER, 2318 .help = "limit total bytes per second", 2319 },{ 2320 .name = "throttling.bps-read", 2321 .type = QEMU_OPT_NUMBER, 2322 .help = "limit read bytes per second", 2323 },{ 2324 .name = "throttling.bps-write", 2325 .type = QEMU_OPT_NUMBER, 2326 .help = "limit write bytes per second", 2327 },{ 2328 .name = "throttling.iops-total-max", 2329 .type = QEMU_OPT_NUMBER, 2330 .help = "I/O operations burst", 2331 },{ 2332 .name = "throttling.iops-read-max", 2333 .type = QEMU_OPT_NUMBER, 2334 .help = "I/O operations read burst", 2335 },{ 2336 .name = "throttling.iops-write-max", 2337 .type = QEMU_OPT_NUMBER, 2338 .help = "I/O operations write burst", 2339 },{ 2340 .name = "throttling.bps-total-max", 2341 .type = QEMU_OPT_NUMBER, 2342 .help = "total bytes burst", 2343 },{ 2344 .name = "throttling.bps-read-max", 2345 .type = QEMU_OPT_NUMBER, 2346 .help = "total bytes read burst", 2347 },{ 2348 .name = "throttling.bps-write-max", 2349 .type = QEMU_OPT_NUMBER, 2350 .help = "total bytes write burst", 2351 },{ 2352 .name = "throttling.iops-size", 2353 .type = QEMU_OPT_NUMBER, 2354 .help = "when limiting by iops max size of an I/O in bytes", 2355 },{ 2356 .name = "copy-on-read", 2357 .type = QEMU_OPT_BOOL, 2358 .help = "copy read data from backing file into image file", 2359 }, 2360 { /* end of list */ } 2361 }, 2362 }; 2363 2364 QemuOptsList qemu_drive_opts = { 2365 .name = "drive", 2366 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2367 .desc = { 2368 /* 2369 * no elements => accept any params 2370 * validation will happen later 2371 */ 2372 { /* end of list */ } 2373 }, 2374 }; 2375