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 "qemu/option.h" 38 #include "qemu/config-file.h" 39 #include "qapi/qmp/types.h" 40 #include "qapi-visit.h" 41 #include "qapi/qmp-output-visitor.h" 42 #include "sysemu/sysemu.h" 43 #include "block/block_int.h" 44 #include "qmp-commands.h" 45 #include "trace.h" 46 #include "sysemu/arch_init.h" 47 48 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 49 50 static const char *const if_name[IF_COUNT] = { 51 [IF_NONE] = "none", 52 [IF_IDE] = "ide", 53 [IF_SCSI] = "scsi", 54 [IF_FLOPPY] = "floppy", 55 [IF_PFLASH] = "pflash", 56 [IF_MTD] = "mtd", 57 [IF_SD] = "sd", 58 [IF_VIRTIO] = "virtio", 59 [IF_XEN] = "xen", 60 }; 61 62 static const int if_max_devs[IF_COUNT] = { 63 /* 64 * Do not change these numbers! They govern how drive option 65 * index maps to unit and bus. That mapping is ABI. 66 * 67 * All controllers used to imlement if=T drives need to support 68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 69 * Otherwise, some index values map to "impossible" bus, unit 70 * values. 71 * 72 * For instance, if you change [IF_SCSI] to 255, -drive 73 * if=scsi,index=12 no longer means bus=1,unit=5, but 74 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 75 * the drive can't be set up. Regression. 76 */ 77 [IF_IDE] = 2, 78 [IF_SCSI] = 7, 79 }; 80 81 /* 82 * We automatically delete the drive when a device using it gets 83 * unplugged. Questionable feature, but we can't just drop it. 84 * Device models call blockdev_mark_auto_del() to schedule the 85 * automatic deletion, and generic qdev code calls blockdev_auto_del() 86 * when deletion is actually safe. 87 */ 88 void blockdev_mark_auto_del(BlockDriverState *bs) 89 { 90 DriveInfo *dinfo = drive_get_by_blockdev(bs); 91 92 if (dinfo && !dinfo->enable_auto_del) { 93 return; 94 } 95 96 if (bs->job) { 97 block_job_cancel(bs->job); 98 } 99 if (dinfo) { 100 dinfo->auto_del = 1; 101 } 102 } 103 104 void blockdev_auto_del(BlockDriverState *bs) 105 { 106 DriveInfo *dinfo = drive_get_by_blockdev(bs); 107 108 if (dinfo && dinfo->auto_del) { 109 drive_put_ref(dinfo); 110 } 111 } 112 113 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 114 { 115 int max_devs = if_max_devs[type]; 116 return max_devs ? index / max_devs : 0; 117 } 118 119 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 120 { 121 int max_devs = if_max_devs[type]; 122 return max_devs ? index % max_devs : index; 123 } 124 125 QemuOpts *drive_def(const char *optstr) 126 { 127 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 128 } 129 130 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 131 const char *optstr) 132 { 133 QemuOpts *opts; 134 char buf[32]; 135 136 opts = drive_def(optstr); 137 if (!opts) { 138 return NULL; 139 } 140 if (type != IF_DEFAULT) { 141 qemu_opt_set(opts, "if", if_name[type]); 142 } 143 if (index >= 0) { 144 snprintf(buf, sizeof(buf), "%d", index); 145 qemu_opt_set(opts, "index", buf); 146 } 147 if (file) 148 qemu_opt_set(opts, "file", file); 149 return opts; 150 } 151 152 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 153 { 154 DriveInfo *dinfo; 155 156 /* seek interface, bus and unit */ 157 158 QTAILQ_FOREACH(dinfo, &drives, next) { 159 if (dinfo->type == type && 160 dinfo->bus == bus && 161 dinfo->unit == unit) 162 return dinfo; 163 } 164 165 return NULL; 166 } 167 168 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 169 { 170 return drive_get(type, 171 drive_index_to_bus_id(type, index), 172 drive_index_to_unit_id(type, index)); 173 } 174 175 int drive_get_max_bus(BlockInterfaceType type) 176 { 177 int max_bus; 178 DriveInfo *dinfo; 179 180 max_bus = -1; 181 QTAILQ_FOREACH(dinfo, &drives, next) { 182 if(dinfo->type == type && 183 dinfo->bus > max_bus) 184 max_bus = dinfo->bus; 185 } 186 return max_bus; 187 } 188 189 /* Get a block device. This should only be used for single-drive devices 190 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 191 appropriate bus. */ 192 DriveInfo *drive_get_next(BlockInterfaceType type) 193 { 194 static int next_block_unit[IF_COUNT]; 195 196 return drive_get(type, 0, next_block_unit[type]++); 197 } 198 199 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 200 { 201 DriveInfo *dinfo; 202 203 QTAILQ_FOREACH(dinfo, &drives, next) { 204 if (dinfo->bdrv == bs) { 205 return dinfo; 206 } 207 } 208 return NULL; 209 } 210 211 static void bdrv_format_print(void *opaque, const char *name) 212 { 213 error_printf(" %s", name); 214 } 215 216 static void drive_uninit(DriveInfo *dinfo) 217 { 218 if (dinfo->opts) { 219 qemu_opts_del(dinfo->opts); 220 } 221 222 bdrv_unref(dinfo->bdrv); 223 g_free(dinfo->id); 224 QTAILQ_REMOVE(&drives, dinfo, next); 225 g_free(dinfo->serial); 226 g_free(dinfo); 227 } 228 229 void drive_put_ref(DriveInfo *dinfo) 230 { 231 assert(dinfo->refcount); 232 if (--dinfo->refcount == 0) { 233 drive_uninit(dinfo); 234 } 235 } 236 237 void drive_get_ref(DriveInfo *dinfo) 238 { 239 dinfo->refcount++; 240 } 241 242 typedef struct { 243 QEMUBH *bh; 244 BlockDriverState *bs; 245 } BDRVPutRefBH; 246 247 static void bdrv_put_ref_bh(void *opaque) 248 { 249 BDRVPutRefBH *s = opaque; 250 251 bdrv_unref(s->bs); 252 qemu_bh_delete(s->bh); 253 g_free(s); 254 } 255 256 /* 257 * Release a BDS reference in a BH 258 * 259 * It is not safe to use bdrv_unref() from a callback function when the callers 260 * still need the BlockDriverState. In such cases we schedule a BH to release 261 * the reference. 262 */ 263 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 264 { 265 BDRVPutRefBH *s; 266 267 s = g_new(BDRVPutRefBH, 1); 268 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 269 s->bs = bs; 270 qemu_bh_schedule(s->bh); 271 } 272 273 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 274 { 275 if (!strcmp(buf, "ignore")) { 276 return BLOCKDEV_ON_ERROR_IGNORE; 277 } else if (!is_read && !strcmp(buf, "enospc")) { 278 return BLOCKDEV_ON_ERROR_ENOSPC; 279 } else if (!strcmp(buf, "stop")) { 280 return BLOCKDEV_ON_ERROR_STOP; 281 } else if (!strcmp(buf, "report")) { 282 return BLOCKDEV_ON_ERROR_REPORT; 283 } else { 284 error_setg(errp, "'%s' invalid %s error action", 285 buf, is_read ? "read" : "write"); 286 return -1; 287 } 288 } 289 290 static inline int parse_enum_option(const char *lookup[], const char *buf, 291 int max, int def, Error **errp) 292 { 293 int i; 294 295 if (!buf) { 296 return def; 297 } 298 299 for (i = 0; i < max; i++) { 300 if (!strcmp(buf, lookup[i])) { 301 return i; 302 } 303 } 304 305 error_setg(errp, "invalid parameter value: %s", buf); 306 return def; 307 } 308 309 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 310 { 311 if (throttle_conflicting(cfg)) { 312 error_setg(errp, "bps/iops/max total values and read/write values" 313 " cannot be used at the same time"); 314 return false; 315 } 316 317 if (!throttle_is_valid(cfg)) { 318 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 319 return false; 320 } 321 322 return true; 323 } 324 325 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 326 327 /* Takes the ownership of bs_opts */ 328 static DriveInfo *blockdev_init(const char *file, QDict *bs_opts, 329 Error **errp) 330 { 331 const char *buf; 332 const char *serial; 333 int ro = 0; 334 int bdrv_flags = 0; 335 int on_read_error, on_write_error; 336 DriveInfo *dinfo; 337 ThrottleConfig cfg; 338 int snapshot = 0; 339 bool copy_on_read; 340 int ret; 341 Error *error = NULL; 342 QemuOpts *opts; 343 const char *id; 344 bool has_driver_specific_opts; 345 BlockdevDetectZeroesOptions detect_zeroes; 346 BlockDriver *drv = NULL; 347 348 /* Check common options by copying from bs_opts to opts, all other options 349 * stay in bs_opts for processing by bdrv_open(). */ 350 id = qdict_get_try_str(bs_opts, "id"); 351 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 352 if (error) { 353 error_propagate(errp, error); 354 return NULL; 355 } 356 357 qemu_opts_absorb_qdict(opts, bs_opts, &error); 358 if (error) { 359 error_propagate(errp, error); 360 goto early_err; 361 } 362 363 if (id) { 364 qdict_del(bs_opts, "id"); 365 } 366 367 has_driver_specific_opts = !!qdict_size(bs_opts); 368 369 /* extract parameters */ 370 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 371 ro = qemu_opt_get_bool(opts, "read-only", 0); 372 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 373 374 serial = qemu_opt_get(opts, "serial"); 375 376 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 377 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 378 error_setg(errp, "invalid discard option"); 379 goto early_err; 380 } 381 } 382 383 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 384 bdrv_flags |= BDRV_O_CACHE_WB; 385 } 386 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 387 bdrv_flags |= BDRV_O_NOCACHE; 388 } 389 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 390 bdrv_flags |= BDRV_O_NO_FLUSH; 391 } 392 393 #ifdef CONFIG_LINUX_AIO 394 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 395 if (!strcmp(buf, "native")) { 396 bdrv_flags |= BDRV_O_NATIVE_AIO; 397 } else if (!strcmp(buf, "threads")) { 398 /* this is the default */ 399 } else { 400 error_setg(errp, "invalid aio option"); 401 goto early_err; 402 } 403 } 404 #endif 405 406 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 407 if (is_help_option(buf)) { 408 error_printf("Supported formats:"); 409 bdrv_iterate_format(bdrv_format_print, NULL); 410 error_printf("\n"); 411 goto early_err; 412 } 413 414 drv = bdrv_find_format(buf); 415 if (!drv) { 416 error_setg(errp, "'%s' invalid format", buf); 417 goto early_err; 418 } 419 } 420 421 /* disk I/O throttling */ 422 memset(&cfg, 0, sizeof(cfg)); 423 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 424 qemu_opt_get_number(opts, "throttling.bps-total", 0); 425 cfg.buckets[THROTTLE_BPS_READ].avg = 426 qemu_opt_get_number(opts, "throttling.bps-read", 0); 427 cfg.buckets[THROTTLE_BPS_WRITE].avg = 428 qemu_opt_get_number(opts, "throttling.bps-write", 0); 429 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 430 qemu_opt_get_number(opts, "throttling.iops-total", 0); 431 cfg.buckets[THROTTLE_OPS_READ].avg = 432 qemu_opt_get_number(opts, "throttling.iops-read", 0); 433 cfg.buckets[THROTTLE_OPS_WRITE].avg = 434 qemu_opt_get_number(opts, "throttling.iops-write", 0); 435 436 cfg.buckets[THROTTLE_BPS_TOTAL].max = 437 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 438 cfg.buckets[THROTTLE_BPS_READ].max = 439 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 440 cfg.buckets[THROTTLE_BPS_WRITE].max = 441 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 442 cfg.buckets[THROTTLE_OPS_TOTAL].max = 443 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 444 cfg.buckets[THROTTLE_OPS_READ].max = 445 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 446 cfg.buckets[THROTTLE_OPS_WRITE].max = 447 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 448 449 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 450 451 if (!check_throttle_config(&cfg, &error)) { 452 error_propagate(errp, error); 453 goto early_err; 454 } 455 456 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 457 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 458 on_write_error = parse_block_error_action(buf, 0, &error); 459 if (error) { 460 error_propagate(errp, error); 461 goto early_err; 462 } 463 } 464 465 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 466 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 467 on_read_error = parse_block_error_action(buf, 1, &error); 468 if (error) { 469 error_propagate(errp, error); 470 goto early_err; 471 } 472 } 473 474 detect_zeroes = 475 parse_enum_option(BlockdevDetectZeroesOptions_lookup, 476 qemu_opt_get(opts, "detect-zeroes"), 477 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 478 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 479 &error); 480 if (error) { 481 error_propagate(errp, error); 482 goto early_err; 483 } 484 485 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 486 !(bdrv_flags & BDRV_O_UNMAP)) { 487 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 488 "without setting discard operation to unmap"); 489 goto early_err; 490 } 491 492 /* init */ 493 dinfo = g_malloc0(sizeof(*dinfo)); 494 dinfo->id = g_strdup(qemu_opts_id(opts)); 495 dinfo->bdrv = bdrv_new(dinfo->id, &error); 496 if (error) { 497 error_propagate(errp, error); 498 goto bdrv_new_err; 499 } 500 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 501 dinfo->bdrv->read_only = ro; 502 dinfo->bdrv->detect_zeroes = detect_zeroes; 503 dinfo->refcount = 1; 504 if (serial != NULL) { 505 dinfo->serial = g_strdup(serial); 506 } 507 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 508 509 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 510 511 /* disk I/O throttling */ 512 if (throttle_enabled(&cfg)) { 513 bdrv_io_limits_enable(dinfo->bdrv); 514 bdrv_set_io_limits(dinfo->bdrv, &cfg); 515 } 516 517 if (!file || !*file) { 518 if (has_driver_specific_opts) { 519 file = NULL; 520 } else { 521 QDECREF(bs_opts); 522 qemu_opts_del(opts); 523 return dinfo; 524 } 525 } 526 if (snapshot) { 527 /* always use cache=unsafe with snapshot */ 528 bdrv_flags &= ~BDRV_O_CACHE_MASK; 529 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 530 } 531 532 if (copy_on_read) { 533 bdrv_flags |= BDRV_O_COPY_ON_READ; 534 } 535 536 if (runstate_check(RUN_STATE_INMIGRATE)) { 537 bdrv_flags |= BDRV_O_INCOMING; 538 } 539 540 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 541 542 QINCREF(bs_opts); 543 ret = bdrv_open(&dinfo->bdrv, file, NULL, bs_opts, bdrv_flags, drv, &error); 544 545 if (ret < 0) { 546 error_setg(errp, "could not open disk image %s: %s", 547 file ?: dinfo->id, error_get_pretty(error)); 548 error_free(error); 549 goto err; 550 } 551 552 if (bdrv_key_required(dinfo->bdrv)) 553 autostart = 0; 554 555 QDECREF(bs_opts); 556 qemu_opts_del(opts); 557 558 return dinfo; 559 560 err: 561 bdrv_unref(dinfo->bdrv); 562 QTAILQ_REMOVE(&drives, dinfo, next); 563 bdrv_new_err: 564 g_free(dinfo->id); 565 g_free(dinfo); 566 early_err: 567 QDECREF(bs_opts); 568 qemu_opts_del(opts); 569 return NULL; 570 } 571 572 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to) 573 { 574 const char *value; 575 576 value = qemu_opt_get(opts, from); 577 if (value) { 578 qemu_opt_set(opts, to, value); 579 qemu_opt_unset(opts, from); 580 } 581 } 582 583 QemuOptsList qemu_legacy_drive_opts = { 584 .name = "drive", 585 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 586 .desc = { 587 { 588 .name = "bus", 589 .type = QEMU_OPT_NUMBER, 590 .help = "bus number", 591 },{ 592 .name = "unit", 593 .type = QEMU_OPT_NUMBER, 594 .help = "unit number (i.e. lun for scsi)", 595 },{ 596 .name = "index", 597 .type = QEMU_OPT_NUMBER, 598 .help = "index number", 599 },{ 600 .name = "media", 601 .type = QEMU_OPT_STRING, 602 .help = "media type (disk, cdrom)", 603 },{ 604 .name = "if", 605 .type = QEMU_OPT_STRING, 606 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 607 },{ 608 .name = "cyls", 609 .type = QEMU_OPT_NUMBER, 610 .help = "number of cylinders (ide disk geometry)", 611 },{ 612 .name = "heads", 613 .type = QEMU_OPT_NUMBER, 614 .help = "number of heads (ide disk geometry)", 615 },{ 616 .name = "secs", 617 .type = QEMU_OPT_NUMBER, 618 .help = "number of sectors (ide disk geometry)", 619 },{ 620 .name = "trans", 621 .type = QEMU_OPT_STRING, 622 .help = "chs translation (auto, lba, none)", 623 },{ 624 .name = "boot", 625 .type = QEMU_OPT_BOOL, 626 .help = "(deprecated, ignored)", 627 },{ 628 .name = "addr", 629 .type = QEMU_OPT_STRING, 630 .help = "pci address (virtio only)", 631 },{ 632 .name = "file", 633 .type = QEMU_OPT_STRING, 634 .help = "file name", 635 }, 636 637 /* Options that are passed on, but have special semantics with -drive */ 638 { 639 .name = "read-only", 640 .type = QEMU_OPT_BOOL, 641 .help = "open drive file as read-only", 642 },{ 643 .name = "rerror", 644 .type = QEMU_OPT_STRING, 645 .help = "read error action", 646 },{ 647 .name = "werror", 648 .type = QEMU_OPT_STRING, 649 .help = "write error action", 650 },{ 651 .name = "copy-on-read", 652 .type = QEMU_OPT_BOOL, 653 .help = "copy read data from backing file into image file", 654 }, 655 656 { /* end of list */ } 657 }, 658 }; 659 660 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type) 661 { 662 const char *value; 663 DriveInfo *dinfo = NULL; 664 QDict *bs_opts; 665 QemuOpts *legacy_opts; 666 DriveMediaType media = MEDIA_DISK; 667 BlockInterfaceType type; 668 int cyls, heads, secs, translation; 669 int max_devs, bus_id, unit_id, index; 670 const char *devaddr; 671 const char *werror, *rerror; 672 bool read_only = false; 673 bool copy_on_read; 674 const char *filename; 675 Error *local_err = NULL; 676 677 /* Change legacy command line options into QMP ones */ 678 qemu_opt_rename(all_opts, "iops", "throttling.iops-total"); 679 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read"); 680 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write"); 681 682 qemu_opt_rename(all_opts, "bps", "throttling.bps-total"); 683 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read"); 684 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write"); 685 686 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max"); 687 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max"); 688 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max"); 689 690 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max"); 691 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max"); 692 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max"); 693 694 qemu_opt_rename(all_opts, 695 "iops_size", "throttling.iops-size"); 696 697 qemu_opt_rename(all_opts, "readonly", "read-only"); 698 699 value = qemu_opt_get(all_opts, "cache"); 700 if (value) { 701 int flags = 0; 702 703 if (bdrv_parse_cache_flags(value, &flags) != 0) { 704 error_report("invalid cache option"); 705 return NULL; 706 } 707 708 /* Specific options take precedence */ 709 if (!qemu_opt_get(all_opts, "cache.writeback")) { 710 qemu_opt_set_bool(all_opts, "cache.writeback", 711 !!(flags & BDRV_O_CACHE_WB)); 712 } 713 if (!qemu_opt_get(all_opts, "cache.direct")) { 714 qemu_opt_set_bool(all_opts, "cache.direct", 715 !!(flags & BDRV_O_NOCACHE)); 716 } 717 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 718 qemu_opt_set_bool(all_opts, "cache.no-flush", 719 !!(flags & BDRV_O_NO_FLUSH)); 720 } 721 qemu_opt_unset(all_opts, "cache"); 722 } 723 724 /* Get a QDict for processing the options */ 725 bs_opts = qdict_new(); 726 qemu_opts_to_qdict(all_opts, bs_opts); 727 728 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 729 &error_abort); 730 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 731 if (local_err) { 732 error_report("%s", error_get_pretty(local_err)); 733 error_free(local_err); 734 goto fail; 735 } 736 737 /* Deprecated option boot=[on|off] */ 738 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 739 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 740 "ignored. Future versions will reject this parameter. Please " 741 "update your scripts.\n"); 742 } 743 744 /* Media type */ 745 value = qemu_opt_get(legacy_opts, "media"); 746 if (value) { 747 if (!strcmp(value, "disk")) { 748 media = MEDIA_DISK; 749 } else if (!strcmp(value, "cdrom")) { 750 media = MEDIA_CDROM; 751 read_only = true; 752 } else { 753 error_report("'%s' invalid media", value); 754 goto fail; 755 } 756 } 757 758 /* copy-on-read is disabled with a warning for read-only devices */ 759 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 760 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 761 762 if (read_only && copy_on_read) { 763 error_report("warning: disabling copy-on-read on read-only drive"); 764 copy_on_read = false; 765 } 766 767 qdict_put(bs_opts, "read-only", 768 qstring_from_str(read_only ? "on" : "off")); 769 qdict_put(bs_opts, "copy-on-read", 770 qstring_from_str(copy_on_read ? "on" :"off")); 771 772 /* Controller type */ 773 value = qemu_opt_get(legacy_opts, "if"); 774 if (value) { 775 for (type = 0; 776 type < IF_COUNT && strcmp(value, if_name[type]); 777 type++) { 778 } 779 if (type == IF_COUNT) { 780 error_report("unsupported bus type '%s'", value); 781 goto fail; 782 } 783 } else { 784 type = block_default_type; 785 } 786 787 /* Geometry */ 788 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 789 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 790 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 791 792 if (cyls || heads || secs) { 793 if (cyls < 1) { 794 error_report("invalid physical cyls number"); 795 goto fail; 796 } 797 if (heads < 1) { 798 error_report("invalid physical heads number"); 799 goto fail; 800 } 801 if (secs < 1) { 802 error_report("invalid physical secs number"); 803 goto fail; 804 } 805 } 806 807 translation = BIOS_ATA_TRANSLATION_AUTO; 808 value = qemu_opt_get(legacy_opts, "trans"); 809 if (value != NULL) { 810 if (!cyls) { 811 error_report("'%s' trans must be used with cyls, heads and secs", 812 value); 813 goto fail; 814 } 815 if (!strcmp(value, "none")) { 816 translation = BIOS_ATA_TRANSLATION_NONE; 817 } else if (!strcmp(value, "lba")) { 818 translation = BIOS_ATA_TRANSLATION_LBA; 819 } else if (!strcmp(value, "large")) { 820 translation = BIOS_ATA_TRANSLATION_LARGE; 821 } else if (!strcmp(value, "rechs")) { 822 translation = BIOS_ATA_TRANSLATION_RECHS; 823 } else if (!strcmp(value, "auto")) { 824 translation = BIOS_ATA_TRANSLATION_AUTO; 825 } else { 826 error_report("'%s' invalid translation type", value); 827 goto fail; 828 } 829 } 830 831 if (media == MEDIA_CDROM) { 832 if (cyls || secs || heads) { 833 error_report("CHS can't be set with media=cdrom"); 834 goto fail; 835 } 836 } 837 838 /* Device address specified by bus/unit or index. 839 * If none was specified, try to find the first free one. */ 840 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 841 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 842 index = qemu_opt_get_number(legacy_opts, "index", -1); 843 844 max_devs = if_max_devs[type]; 845 846 if (index != -1) { 847 if (bus_id != 0 || unit_id != -1) { 848 error_report("index cannot be used with bus and unit"); 849 goto fail; 850 } 851 bus_id = drive_index_to_bus_id(type, index); 852 unit_id = drive_index_to_unit_id(type, index); 853 } 854 855 if (unit_id == -1) { 856 unit_id = 0; 857 while (drive_get(type, bus_id, unit_id) != NULL) { 858 unit_id++; 859 if (max_devs && unit_id >= max_devs) { 860 unit_id -= max_devs; 861 bus_id++; 862 } 863 } 864 } 865 866 if (max_devs && unit_id >= max_devs) { 867 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 868 goto fail; 869 } 870 871 if (drive_get(type, bus_id, unit_id) != NULL) { 872 error_report("drive with bus=%d, unit=%d (index=%d) exists", 873 bus_id, unit_id, index); 874 goto fail; 875 } 876 877 /* no id supplied -> create one */ 878 if (qemu_opts_id(all_opts) == NULL) { 879 char *new_id; 880 const char *mediastr = ""; 881 if (type == IF_IDE || type == IF_SCSI) { 882 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 883 } 884 if (max_devs) { 885 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 886 mediastr, unit_id); 887 } else { 888 new_id = g_strdup_printf("%s%s%i", if_name[type], 889 mediastr, unit_id); 890 } 891 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 892 g_free(new_id); 893 } 894 895 /* Add virtio block device */ 896 devaddr = qemu_opt_get(legacy_opts, "addr"); 897 if (devaddr && type != IF_VIRTIO) { 898 error_report("addr is not supported by this bus type"); 899 goto fail; 900 } 901 902 if (type == IF_VIRTIO) { 903 QemuOpts *devopts; 904 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 905 &error_abort); 906 if (arch_type == QEMU_ARCH_S390X) { 907 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 908 } else { 909 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 910 } 911 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 912 if (devaddr) { 913 qemu_opt_set(devopts, "addr", devaddr); 914 } 915 } 916 917 filename = qemu_opt_get(legacy_opts, "file"); 918 919 /* Check werror/rerror compatibility with if=... */ 920 werror = qemu_opt_get(legacy_opts, "werror"); 921 if (werror != NULL) { 922 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 923 type != IF_NONE) { 924 error_report("werror is not supported by this bus type"); 925 goto fail; 926 } 927 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 928 } 929 930 rerror = qemu_opt_get(legacy_opts, "rerror"); 931 if (rerror != NULL) { 932 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 933 type != IF_NONE) { 934 error_report("rerror is not supported by this bus type"); 935 goto fail; 936 } 937 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 938 } 939 940 /* Actual block device init: Functionality shared with blockdev-add */ 941 dinfo = blockdev_init(filename, bs_opts, &local_err); 942 if (dinfo == NULL) { 943 if (local_err) { 944 error_report("%s", error_get_pretty(local_err)); 945 error_free(local_err); 946 } 947 goto fail; 948 } else { 949 assert(!local_err); 950 } 951 952 /* Set legacy DriveInfo fields */ 953 dinfo->enable_auto_del = true; 954 dinfo->opts = all_opts; 955 956 dinfo->cyls = cyls; 957 dinfo->heads = heads; 958 dinfo->secs = secs; 959 dinfo->trans = translation; 960 961 dinfo->type = type; 962 dinfo->bus = bus_id; 963 dinfo->unit = unit_id; 964 dinfo->devaddr = devaddr; 965 966 switch(type) { 967 case IF_IDE: 968 case IF_SCSI: 969 case IF_XEN: 970 case IF_NONE: 971 dinfo->media_cd = media == MEDIA_CDROM; 972 break; 973 default: 974 break; 975 } 976 977 fail: 978 qemu_opts_del(legacy_opts); 979 return dinfo; 980 } 981 982 void do_commit(Monitor *mon, const QDict *qdict) 983 { 984 const char *device = qdict_get_str(qdict, "device"); 985 BlockDriverState *bs; 986 int ret; 987 988 if (!strcmp(device, "all")) { 989 ret = bdrv_commit_all(); 990 } else { 991 bs = bdrv_find(device); 992 if (!bs) { 993 monitor_printf(mon, "Device '%s' not found\n", device); 994 return; 995 } 996 ret = bdrv_commit(bs); 997 } 998 if (ret < 0) { 999 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1000 strerror(-ret)); 1001 } 1002 } 1003 1004 static void blockdev_do_action(int kind, void *data, Error **errp) 1005 { 1006 TransactionAction action; 1007 TransactionActionList list; 1008 1009 action.kind = kind; 1010 action.data = data; 1011 list.value = &action; 1012 list.next = NULL; 1013 qmp_transaction(&list, errp); 1014 } 1015 1016 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1017 bool has_node_name, const char *node_name, 1018 const char *snapshot_file, 1019 bool has_snapshot_node_name, 1020 const char *snapshot_node_name, 1021 bool has_format, const char *format, 1022 bool has_mode, NewImageMode mode, Error **errp) 1023 { 1024 BlockdevSnapshot snapshot = { 1025 .has_device = has_device, 1026 .device = (char *) device, 1027 .has_node_name = has_node_name, 1028 .node_name = (char *) node_name, 1029 .snapshot_file = (char *) snapshot_file, 1030 .has_snapshot_node_name = has_snapshot_node_name, 1031 .snapshot_node_name = (char *) snapshot_node_name, 1032 .has_format = has_format, 1033 .format = (char *) format, 1034 .has_mode = has_mode, 1035 .mode = mode, 1036 }; 1037 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1038 &snapshot, errp); 1039 } 1040 1041 void qmp_blockdev_snapshot_internal_sync(const char *device, 1042 const char *name, 1043 Error **errp) 1044 { 1045 BlockdevSnapshotInternal snapshot = { 1046 .device = (char *) device, 1047 .name = (char *) name 1048 }; 1049 1050 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1051 &snapshot, errp); 1052 } 1053 1054 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1055 bool has_id, 1056 const char *id, 1057 bool has_name, 1058 const char *name, 1059 Error **errp) 1060 { 1061 BlockDriverState *bs = bdrv_find(device); 1062 QEMUSnapshotInfo sn; 1063 Error *local_err = NULL; 1064 SnapshotInfo *info = NULL; 1065 int ret; 1066 1067 if (!bs) { 1068 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1069 return NULL; 1070 } 1071 1072 if (!has_id) { 1073 id = NULL; 1074 } 1075 1076 if (!has_name) { 1077 name = NULL; 1078 } 1079 1080 if (!id && !name) { 1081 error_setg(errp, "Name or id must be provided"); 1082 return NULL; 1083 } 1084 1085 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1086 if (local_err) { 1087 error_propagate(errp, local_err); 1088 return NULL; 1089 } 1090 if (!ret) { 1091 error_setg(errp, 1092 "Snapshot with id '%s' and name '%s' does not exist on " 1093 "device '%s'", 1094 STR_OR_NULL(id), STR_OR_NULL(name), device); 1095 return NULL; 1096 } 1097 1098 bdrv_snapshot_delete(bs, id, name, &local_err); 1099 if (local_err) { 1100 error_propagate(errp, local_err); 1101 return NULL; 1102 } 1103 1104 info = g_malloc0(sizeof(SnapshotInfo)); 1105 info->id = g_strdup(sn.id_str); 1106 info->name = g_strdup(sn.name); 1107 info->date_nsec = sn.date_nsec; 1108 info->date_sec = sn.date_sec; 1109 info->vm_state_size = sn.vm_state_size; 1110 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1111 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1112 1113 return info; 1114 } 1115 1116 /* New and old BlockDriverState structs for group snapshots */ 1117 1118 typedef struct BlkTransactionState BlkTransactionState; 1119 1120 /* Only prepare() may fail. In a single transaction, only one of commit() or 1121 abort() will be called, clean() will always be called if it present. */ 1122 typedef struct BdrvActionOps { 1123 /* Size of state struct, in bytes. */ 1124 size_t instance_size; 1125 /* Prepare the work, must NOT be NULL. */ 1126 void (*prepare)(BlkTransactionState *common, Error **errp); 1127 /* Commit the changes, can be NULL. */ 1128 void (*commit)(BlkTransactionState *common); 1129 /* Abort the changes on fail, can be NULL. */ 1130 void (*abort)(BlkTransactionState *common); 1131 /* Clean up resource in the end, can be NULL. */ 1132 void (*clean)(BlkTransactionState *common); 1133 } BdrvActionOps; 1134 1135 /* 1136 * This structure must be arranged as first member in child type, assuming 1137 * that compiler will also arrange it to the same address with parent instance. 1138 * Later it will be used in free(). 1139 */ 1140 struct BlkTransactionState { 1141 TransactionAction *action; 1142 const BdrvActionOps *ops; 1143 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1144 }; 1145 1146 /* internal snapshot private data */ 1147 typedef struct InternalSnapshotState { 1148 BlkTransactionState common; 1149 BlockDriverState *bs; 1150 QEMUSnapshotInfo sn; 1151 } InternalSnapshotState; 1152 1153 static void internal_snapshot_prepare(BlkTransactionState *common, 1154 Error **errp) 1155 { 1156 Error *local_err = NULL; 1157 const char *device; 1158 const char *name; 1159 BlockDriverState *bs; 1160 QEMUSnapshotInfo old_sn, *sn; 1161 bool ret; 1162 qemu_timeval tv; 1163 BlockdevSnapshotInternal *internal; 1164 InternalSnapshotState *state; 1165 int ret1; 1166 1167 g_assert(common->action->kind == 1168 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1169 internal = common->action->blockdev_snapshot_internal_sync; 1170 state = DO_UPCAST(InternalSnapshotState, common, common); 1171 1172 /* 1. parse input */ 1173 device = internal->device; 1174 name = internal->name; 1175 1176 /* 2. check for validation */ 1177 bs = bdrv_find(device); 1178 if (!bs) { 1179 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1180 return; 1181 } 1182 1183 if (!bdrv_is_inserted(bs)) { 1184 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1185 return; 1186 } 1187 1188 if (bdrv_is_read_only(bs)) { 1189 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1190 return; 1191 } 1192 1193 if (!bdrv_can_snapshot(bs)) { 1194 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1195 bs->drv->format_name, device, "internal snapshot"); 1196 return; 1197 } 1198 1199 if (!strlen(name)) { 1200 error_setg(errp, "Name is empty"); 1201 return; 1202 } 1203 1204 /* check whether a snapshot with name exist */ 1205 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1206 &local_err); 1207 if (local_err) { 1208 error_propagate(errp, local_err); 1209 return; 1210 } else if (ret) { 1211 error_setg(errp, 1212 "Snapshot with name '%s' already exists on device '%s'", 1213 name, device); 1214 return; 1215 } 1216 1217 /* 3. take the snapshot */ 1218 sn = &state->sn; 1219 pstrcpy(sn->name, sizeof(sn->name), name); 1220 qemu_gettimeofday(&tv); 1221 sn->date_sec = tv.tv_sec; 1222 sn->date_nsec = tv.tv_usec * 1000; 1223 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1224 1225 ret1 = bdrv_snapshot_create(bs, sn); 1226 if (ret1 < 0) { 1227 error_setg_errno(errp, -ret1, 1228 "Failed to create snapshot '%s' on device '%s'", 1229 name, device); 1230 return; 1231 } 1232 1233 /* 4. succeed, mark a snapshot is created */ 1234 state->bs = bs; 1235 } 1236 1237 static void internal_snapshot_abort(BlkTransactionState *common) 1238 { 1239 InternalSnapshotState *state = 1240 DO_UPCAST(InternalSnapshotState, common, common); 1241 BlockDriverState *bs = state->bs; 1242 QEMUSnapshotInfo *sn = &state->sn; 1243 Error *local_error = NULL; 1244 1245 if (!bs) { 1246 return; 1247 } 1248 1249 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1250 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1251 "device '%s' in abort: %s", 1252 sn->id_str, 1253 sn->name, 1254 bdrv_get_device_name(bs), 1255 error_get_pretty(local_error)); 1256 error_free(local_error); 1257 } 1258 } 1259 1260 /* external snapshot private data */ 1261 typedef struct ExternalSnapshotState { 1262 BlkTransactionState common; 1263 BlockDriverState *old_bs; 1264 BlockDriverState *new_bs; 1265 } ExternalSnapshotState; 1266 1267 static void external_snapshot_prepare(BlkTransactionState *common, 1268 Error **errp) 1269 { 1270 BlockDriver *drv; 1271 int flags, ret; 1272 QDict *options = NULL; 1273 Error *local_err = NULL; 1274 bool has_device = false; 1275 const char *device; 1276 bool has_node_name = false; 1277 const char *node_name; 1278 bool has_snapshot_node_name = false; 1279 const char *snapshot_node_name; 1280 const char *new_image_file; 1281 const char *format = "qcow2"; 1282 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1283 ExternalSnapshotState *state = 1284 DO_UPCAST(ExternalSnapshotState, common, common); 1285 TransactionAction *action = common->action; 1286 1287 /* get parameters */ 1288 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1289 1290 has_device = action->blockdev_snapshot_sync->has_device; 1291 device = action->blockdev_snapshot_sync->device; 1292 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1293 node_name = action->blockdev_snapshot_sync->node_name; 1294 has_snapshot_node_name = 1295 action->blockdev_snapshot_sync->has_snapshot_node_name; 1296 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1297 1298 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1299 if (action->blockdev_snapshot_sync->has_format) { 1300 format = action->blockdev_snapshot_sync->format; 1301 } 1302 if (action->blockdev_snapshot_sync->has_mode) { 1303 mode = action->blockdev_snapshot_sync->mode; 1304 } 1305 1306 /* start processing */ 1307 drv = bdrv_find_format(format); 1308 if (!drv) { 1309 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1310 return; 1311 } 1312 1313 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1314 has_node_name ? node_name : NULL, 1315 &local_err); 1316 if (local_err) { 1317 error_propagate(errp, local_err); 1318 return; 1319 } 1320 1321 if (has_node_name && !has_snapshot_node_name) { 1322 error_setg(errp, "New snapshot node name missing"); 1323 return; 1324 } 1325 1326 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1327 error_setg(errp, "New snapshot node name already existing"); 1328 return; 1329 } 1330 1331 if (!bdrv_is_inserted(state->old_bs)) { 1332 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1333 return; 1334 } 1335 1336 if (bdrv_op_is_blocked(state->old_bs, 1337 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1338 return; 1339 } 1340 1341 if (!bdrv_is_read_only(state->old_bs)) { 1342 if (bdrv_flush(state->old_bs)) { 1343 error_set(errp, QERR_IO_ERROR); 1344 return; 1345 } 1346 } 1347 1348 if (!bdrv_is_first_non_filter(state->old_bs)) { 1349 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1350 return; 1351 } 1352 1353 flags = state->old_bs->open_flags; 1354 1355 /* create new image w/backing file */ 1356 if (mode != NEW_IMAGE_MODE_EXISTING) { 1357 bdrv_img_create(new_image_file, format, 1358 state->old_bs->filename, 1359 state->old_bs->drv->format_name, 1360 NULL, -1, flags, &local_err, false); 1361 if (local_err) { 1362 error_propagate(errp, local_err); 1363 return; 1364 } 1365 } 1366 1367 if (has_snapshot_node_name) { 1368 options = qdict_new(); 1369 qdict_put(options, "node-name", 1370 qstring_from_str(snapshot_node_name)); 1371 } 1372 1373 /* TODO Inherit bs->options or only take explicit options with an 1374 * extended QMP command? */ 1375 assert(state->new_bs == NULL); 1376 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1377 flags | BDRV_O_NO_BACKING, drv, &local_err); 1378 /* We will manually add the backing_hd field to the bs later */ 1379 if (ret != 0) { 1380 error_propagate(errp, local_err); 1381 } 1382 } 1383 1384 static void external_snapshot_commit(BlkTransactionState *common) 1385 { 1386 ExternalSnapshotState *state = 1387 DO_UPCAST(ExternalSnapshotState, common, common); 1388 1389 /* This removes our old bs and adds the new bs */ 1390 bdrv_append(state->new_bs, state->old_bs); 1391 /* We don't need (or want) to use the transactional 1392 * bdrv_reopen_multiple() across all the entries at once, because we 1393 * don't want to abort all of them if one of them fails the reopen */ 1394 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1395 NULL); 1396 } 1397 1398 static void external_snapshot_abort(BlkTransactionState *common) 1399 { 1400 ExternalSnapshotState *state = 1401 DO_UPCAST(ExternalSnapshotState, common, common); 1402 if (state->new_bs) { 1403 bdrv_unref(state->new_bs); 1404 } 1405 } 1406 1407 typedef struct DriveBackupState { 1408 BlkTransactionState common; 1409 BlockDriverState *bs; 1410 BlockJob *job; 1411 } DriveBackupState; 1412 1413 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1414 { 1415 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1416 DriveBackup *backup; 1417 Error *local_err = NULL; 1418 1419 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1420 backup = common->action->drive_backup; 1421 1422 qmp_drive_backup(backup->device, backup->target, 1423 backup->has_format, backup->format, 1424 backup->sync, 1425 backup->has_mode, backup->mode, 1426 backup->has_speed, backup->speed, 1427 backup->has_on_source_error, backup->on_source_error, 1428 backup->has_on_target_error, backup->on_target_error, 1429 &local_err); 1430 if (local_err) { 1431 error_propagate(errp, local_err); 1432 state->bs = NULL; 1433 state->job = NULL; 1434 return; 1435 } 1436 1437 state->bs = bdrv_find(backup->device); 1438 state->job = state->bs->job; 1439 } 1440 1441 static void drive_backup_abort(BlkTransactionState *common) 1442 { 1443 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1444 BlockDriverState *bs = state->bs; 1445 1446 /* Only cancel if it's the job we started */ 1447 if (bs && bs->job && bs->job == state->job) { 1448 block_job_cancel_sync(bs->job); 1449 } 1450 } 1451 1452 static void abort_prepare(BlkTransactionState *common, Error **errp) 1453 { 1454 error_setg(errp, "Transaction aborted using Abort action"); 1455 } 1456 1457 static void abort_commit(BlkTransactionState *common) 1458 { 1459 g_assert_not_reached(); /* this action never succeeds */ 1460 } 1461 1462 static const BdrvActionOps actions[] = { 1463 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1464 .instance_size = sizeof(ExternalSnapshotState), 1465 .prepare = external_snapshot_prepare, 1466 .commit = external_snapshot_commit, 1467 .abort = external_snapshot_abort, 1468 }, 1469 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1470 .instance_size = sizeof(DriveBackupState), 1471 .prepare = drive_backup_prepare, 1472 .abort = drive_backup_abort, 1473 }, 1474 [TRANSACTION_ACTION_KIND_ABORT] = { 1475 .instance_size = sizeof(BlkTransactionState), 1476 .prepare = abort_prepare, 1477 .commit = abort_commit, 1478 }, 1479 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1480 .instance_size = sizeof(InternalSnapshotState), 1481 .prepare = internal_snapshot_prepare, 1482 .abort = internal_snapshot_abort, 1483 }, 1484 }; 1485 1486 /* 1487 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1488 * then we do not pivot any of the devices in the group, and abandon the 1489 * snapshots 1490 */ 1491 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1492 { 1493 TransactionActionList *dev_entry = dev_list; 1494 BlkTransactionState *state, *next; 1495 Error *local_err = NULL; 1496 1497 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1498 QSIMPLEQ_INIT(&snap_bdrv_states); 1499 1500 /* drain all i/o before any snapshots */ 1501 bdrv_drain_all(); 1502 1503 /* We don't do anything in this loop that commits us to the snapshot */ 1504 while (NULL != dev_entry) { 1505 TransactionAction *dev_info = NULL; 1506 const BdrvActionOps *ops; 1507 1508 dev_info = dev_entry->value; 1509 dev_entry = dev_entry->next; 1510 1511 assert(dev_info->kind < ARRAY_SIZE(actions)); 1512 1513 ops = &actions[dev_info->kind]; 1514 assert(ops->instance_size > 0); 1515 1516 state = g_malloc0(ops->instance_size); 1517 state->ops = ops; 1518 state->action = dev_info; 1519 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1520 1521 state->ops->prepare(state, &local_err); 1522 if (local_err) { 1523 error_propagate(errp, local_err); 1524 goto delete_and_fail; 1525 } 1526 } 1527 1528 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1529 if (state->ops->commit) { 1530 state->ops->commit(state); 1531 } 1532 } 1533 1534 /* success */ 1535 goto exit; 1536 1537 delete_and_fail: 1538 /* 1539 * failure, and it is all-or-none; abandon each new bs, and keep using 1540 * the original bs for all images 1541 */ 1542 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1543 if (state->ops->abort) { 1544 state->ops->abort(state); 1545 } 1546 } 1547 exit: 1548 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1549 if (state->ops->clean) { 1550 state->ops->clean(state); 1551 } 1552 g_free(state); 1553 } 1554 } 1555 1556 1557 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1558 { 1559 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1560 return; 1561 } 1562 if (!bdrv_dev_has_removable_media(bs)) { 1563 error_setg(errp, "Device '%s' is not removable", 1564 bdrv_get_device_name(bs)); 1565 return; 1566 } 1567 1568 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1569 bdrv_dev_eject_request(bs, force); 1570 if (!force) { 1571 error_setg(errp, "Device '%s' is locked", 1572 bdrv_get_device_name(bs)); 1573 return; 1574 } 1575 } 1576 1577 bdrv_close(bs); 1578 } 1579 1580 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1581 { 1582 BlockDriverState *bs; 1583 1584 bs = bdrv_find(device); 1585 if (!bs) { 1586 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1587 return; 1588 } 1589 1590 eject_device(bs, force, errp); 1591 } 1592 1593 void qmp_block_passwd(bool has_device, const char *device, 1594 bool has_node_name, const char *node_name, 1595 const char *password, Error **errp) 1596 { 1597 Error *local_err = NULL; 1598 BlockDriverState *bs; 1599 int err; 1600 1601 bs = bdrv_lookup_bs(has_device ? device : NULL, 1602 has_node_name ? node_name : NULL, 1603 &local_err); 1604 if (local_err) { 1605 error_propagate(errp, local_err); 1606 return; 1607 } 1608 1609 err = bdrv_set_key(bs, password); 1610 if (err == -EINVAL) { 1611 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1612 return; 1613 } else if (err < 0) { 1614 error_set(errp, QERR_INVALID_PASSWORD); 1615 return; 1616 } 1617 } 1618 1619 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1620 int bdrv_flags, BlockDriver *drv, 1621 const char *password, Error **errp) 1622 { 1623 Error *local_err = NULL; 1624 int ret; 1625 1626 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1627 if (ret < 0) { 1628 error_propagate(errp, local_err); 1629 return; 1630 } 1631 1632 if (bdrv_key_required(bs)) { 1633 if (password) { 1634 if (bdrv_set_key(bs, password) < 0) { 1635 error_set(errp, QERR_INVALID_PASSWORD); 1636 } 1637 } else { 1638 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1639 bdrv_get_encrypted_filename(bs)); 1640 } 1641 } else if (password) { 1642 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1643 } 1644 } 1645 1646 void qmp_change_blockdev(const char *device, const char *filename, 1647 const char *format, Error **errp) 1648 { 1649 BlockDriverState *bs; 1650 BlockDriver *drv = NULL; 1651 int bdrv_flags; 1652 Error *err = NULL; 1653 1654 bs = bdrv_find(device); 1655 if (!bs) { 1656 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1657 return; 1658 } 1659 1660 if (format) { 1661 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1662 if (!drv) { 1663 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1664 return; 1665 } 1666 } 1667 1668 eject_device(bs, 0, &err); 1669 if (err) { 1670 error_propagate(errp, err); 1671 return; 1672 } 1673 1674 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1675 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1676 1677 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1678 } 1679 1680 /* throttling disk I/O limits */ 1681 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1682 int64_t bps_wr, 1683 int64_t iops, 1684 int64_t iops_rd, 1685 int64_t iops_wr, 1686 bool has_bps_max, 1687 int64_t bps_max, 1688 bool has_bps_rd_max, 1689 int64_t bps_rd_max, 1690 bool has_bps_wr_max, 1691 int64_t bps_wr_max, 1692 bool has_iops_max, 1693 int64_t iops_max, 1694 bool has_iops_rd_max, 1695 int64_t iops_rd_max, 1696 bool has_iops_wr_max, 1697 int64_t iops_wr_max, 1698 bool has_iops_size, 1699 int64_t iops_size, Error **errp) 1700 { 1701 ThrottleConfig cfg; 1702 BlockDriverState *bs; 1703 1704 bs = bdrv_find(device); 1705 if (!bs) { 1706 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1707 return; 1708 } 1709 1710 memset(&cfg, 0, sizeof(cfg)); 1711 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1712 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1713 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1714 1715 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1716 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1717 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1718 1719 if (has_bps_max) { 1720 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1721 } 1722 if (has_bps_rd_max) { 1723 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1724 } 1725 if (has_bps_wr_max) { 1726 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1727 } 1728 if (has_iops_max) { 1729 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1730 } 1731 if (has_iops_rd_max) { 1732 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1733 } 1734 if (has_iops_wr_max) { 1735 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1736 } 1737 1738 if (has_iops_size) { 1739 cfg.op_size = iops_size; 1740 } 1741 1742 if (!check_throttle_config(&cfg, errp)) { 1743 return; 1744 } 1745 1746 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1747 bdrv_io_limits_enable(bs); 1748 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1749 bdrv_io_limits_disable(bs); 1750 } 1751 1752 if (bs->io_limits_enabled) { 1753 bdrv_set_io_limits(bs, &cfg); 1754 } 1755 } 1756 1757 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1758 { 1759 const char *id = qdict_get_str(qdict, "id"); 1760 BlockDriverState *bs; 1761 Error *local_err = NULL; 1762 1763 bs = bdrv_find(id); 1764 if (!bs) { 1765 error_report("Device '%s' not found", id); 1766 return -1; 1767 } 1768 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 1769 error_report("%s", error_get_pretty(local_err)); 1770 error_free(local_err); 1771 return -1; 1772 } 1773 1774 /* quiesce block driver; prevent further io */ 1775 bdrv_drain_all(); 1776 bdrv_flush(bs); 1777 bdrv_close(bs); 1778 1779 /* if we have a device attached to this BlockDriverState 1780 * then we need to make the drive anonymous until the device 1781 * can be removed. If this is a drive with no device backing 1782 * then we can just get rid of the block driver state right here. 1783 */ 1784 if (bdrv_get_attached_dev(bs)) { 1785 bdrv_make_anon(bs); 1786 1787 /* Further I/O must not pause the guest */ 1788 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1789 BLOCKDEV_ON_ERROR_REPORT); 1790 } else { 1791 drive_uninit(drive_get_by_blockdev(bs)); 1792 } 1793 1794 return 0; 1795 } 1796 1797 void qmp_block_resize(bool has_device, const char *device, 1798 bool has_node_name, const char *node_name, 1799 int64_t size, Error **errp) 1800 { 1801 Error *local_err = NULL; 1802 BlockDriverState *bs; 1803 int ret; 1804 1805 bs = bdrv_lookup_bs(has_device ? device : NULL, 1806 has_node_name ? node_name : NULL, 1807 &local_err); 1808 if (local_err) { 1809 error_propagate(errp, local_err); 1810 return; 1811 } 1812 1813 if (!bdrv_is_first_non_filter(bs)) { 1814 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 1815 return; 1816 } 1817 1818 if (size < 0) { 1819 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1820 return; 1821 } 1822 1823 /* complete all in-flight operations before resizing the device */ 1824 bdrv_drain_all(); 1825 1826 ret = bdrv_truncate(bs, size); 1827 switch (ret) { 1828 case 0: 1829 break; 1830 case -ENOMEDIUM: 1831 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1832 break; 1833 case -ENOTSUP: 1834 error_set(errp, QERR_UNSUPPORTED); 1835 break; 1836 case -EACCES: 1837 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1838 break; 1839 case -EBUSY: 1840 error_set(errp, QERR_DEVICE_IN_USE, device); 1841 break; 1842 default: 1843 error_setg_errno(errp, -ret, "Could not resize"); 1844 break; 1845 } 1846 } 1847 1848 static void block_job_cb(void *opaque, int ret) 1849 { 1850 BlockDriverState *bs = opaque; 1851 QObject *obj; 1852 1853 trace_block_job_cb(bs, bs->job, ret); 1854 1855 assert(bs->job); 1856 obj = qobject_from_block_job(bs->job); 1857 if (ret < 0) { 1858 QDict *dict = qobject_to_qdict(obj); 1859 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1860 } 1861 1862 if (block_job_is_cancelled(bs->job)) { 1863 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1864 } else { 1865 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1866 } 1867 qobject_decref(obj); 1868 1869 bdrv_put_ref_bh_schedule(bs); 1870 } 1871 1872 void qmp_block_stream(const char *device, bool has_base, 1873 const char *base, bool has_speed, int64_t speed, 1874 bool has_on_error, BlockdevOnError on_error, 1875 Error **errp) 1876 { 1877 BlockDriverState *bs; 1878 BlockDriverState *base_bs = NULL; 1879 Error *local_err = NULL; 1880 1881 if (!has_on_error) { 1882 on_error = BLOCKDEV_ON_ERROR_REPORT; 1883 } 1884 1885 bs = bdrv_find(device); 1886 if (!bs) { 1887 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1888 return; 1889 } 1890 1891 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 1892 return; 1893 } 1894 1895 if (base) { 1896 base_bs = bdrv_find_backing_image(bs, base); 1897 if (base_bs == NULL) { 1898 error_set(errp, QERR_BASE_NOT_FOUND, base); 1899 return; 1900 } 1901 } 1902 1903 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1904 on_error, block_job_cb, bs, &local_err); 1905 if (local_err) { 1906 error_propagate(errp, local_err); 1907 return; 1908 } 1909 1910 trace_qmp_block_stream(bs, bs->job); 1911 } 1912 1913 void qmp_block_commit(const char *device, 1914 bool has_base, const char *base, const char *top, 1915 bool has_speed, int64_t speed, 1916 Error **errp) 1917 { 1918 BlockDriverState *bs; 1919 BlockDriverState *base_bs, *top_bs; 1920 Error *local_err = NULL; 1921 /* This will be part of the QMP command, if/when the 1922 * BlockdevOnError change for blkmirror makes it in 1923 */ 1924 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1925 1926 if (!has_speed) { 1927 speed = 0; 1928 } 1929 1930 /* drain all i/o before commits */ 1931 bdrv_drain_all(); 1932 1933 bs = bdrv_find(device); 1934 if (!bs) { 1935 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1936 return; 1937 } 1938 1939 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) { 1940 return; 1941 } 1942 1943 /* default top_bs is the active layer */ 1944 top_bs = bs; 1945 1946 if (top) { 1947 if (strcmp(bs->filename, top) != 0) { 1948 top_bs = bdrv_find_backing_image(bs, top); 1949 } 1950 } 1951 1952 if (top_bs == NULL) { 1953 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1954 return; 1955 } 1956 1957 if (has_base && base) { 1958 base_bs = bdrv_find_backing_image(top_bs, base); 1959 } else { 1960 base_bs = bdrv_find_base(top_bs); 1961 } 1962 1963 if (base_bs == NULL) { 1964 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1965 return; 1966 } 1967 1968 if (top_bs == bs) { 1969 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 1970 bs, &local_err); 1971 } else { 1972 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1973 &local_err); 1974 } 1975 if (local_err != NULL) { 1976 error_propagate(errp, local_err); 1977 return; 1978 } 1979 } 1980 1981 void qmp_drive_backup(const char *device, const char *target, 1982 bool has_format, const char *format, 1983 enum MirrorSyncMode sync, 1984 bool has_mode, enum NewImageMode mode, 1985 bool has_speed, int64_t speed, 1986 bool has_on_source_error, BlockdevOnError on_source_error, 1987 bool has_on_target_error, BlockdevOnError on_target_error, 1988 Error **errp) 1989 { 1990 BlockDriverState *bs; 1991 BlockDriverState *target_bs; 1992 BlockDriverState *source = NULL; 1993 BlockDriver *drv = NULL; 1994 Error *local_err = NULL; 1995 int flags; 1996 int64_t size; 1997 int ret; 1998 1999 if (!has_speed) { 2000 speed = 0; 2001 } 2002 if (!has_on_source_error) { 2003 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2004 } 2005 if (!has_on_target_error) { 2006 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2007 } 2008 if (!has_mode) { 2009 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2010 } 2011 2012 bs = bdrv_find(device); 2013 if (!bs) { 2014 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2015 return; 2016 } 2017 2018 if (!bdrv_is_inserted(bs)) { 2019 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2020 return; 2021 } 2022 2023 if (!has_format) { 2024 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2025 } 2026 if (format) { 2027 drv = bdrv_find_format(format); 2028 if (!drv) { 2029 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2030 return; 2031 } 2032 } 2033 2034 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2035 return; 2036 } 2037 2038 flags = bs->open_flags | BDRV_O_RDWR; 2039 2040 /* See if we have a backing HD we can use to create our new image 2041 * on top of. */ 2042 if (sync == MIRROR_SYNC_MODE_TOP) { 2043 source = bs->backing_hd; 2044 if (!source) { 2045 sync = MIRROR_SYNC_MODE_FULL; 2046 } 2047 } 2048 if (sync == MIRROR_SYNC_MODE_NONE) { 2049 source = bs; 2050 } 2051 2052 size = bdrv_getlength(bs); 2053 if (size < 0) { 2054 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2055 return; 2056 } 2057 2058 if (mode != NEW_IMAGE_MODE_EXISTING) { 2059 assert(format && drv); 2060 if (source) { 2061 bdrv_img_create(target, format, source->filename, 2062 source->drv->format_name, NULL, 2063 size, flags, &local_err, false); 2064 } else { 2065 bdrv_img_create(target, format, NULL, NULL, NULL, 2066 size, flags, &local_err, false); 2067 } 2068 } 2069 2070 if (local_err) { 2071 error_propagate(errp, local_err); 2072 return; 2073 } 2074 2075 target_bs = NULL; 2076 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2077 if (ret < 0) { 2078 error_propagate(errp, local_err); 2079 return; 2080 } 2081 2082 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2083 block_job_cb, bs, &local_err); 2084 if (local_err != NULL) { 2085 bdrv_unref(target_bs); 2086 error_propagate(errp, local_err); 2087 return; 2088 } 2089 } 2090 2091 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2092 { 2093 return bdrv_named_nodes_list(); 2094 } 2095 2096 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2097 2098 void qmp_drive_mirror(const char *device, const char *target, 2099 bool has_format, const char *format, 2100 enum MirrorSyncMode sync, 2101 bool has_mode, enum NewImageMode mode, 2102 bool has_speed, int64_t speed, 2103 bool has_granularity, uint32_t granularity, 2104 bool has_buf_size, int64_t buf_size, 2105 bool has_on_source_error, BlockdevOnError on_source_error, 2106 bool has_on_target_error, BlockdevOnError on_target_error, 2107 Error **errp) 2108 { 2109 BlockDriverState *bs; 2110 BlockDriverState *source, *target_bs; 2111 BlockDriver *drv = NULL; 2112 Error *local_err = NULL; 2113 int flags; 2114 int64_t size; 2115 int ret; 2116 2117 if (!has_speed) { 2118 speed = 0; 2119 } 2120 if (!has_on_source_error) { 2121 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2122 } 2123 if (!has_on_target_error) { 2124 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2125 } 2126 if (!has_mode) { 2127 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2128 } 2129 if (!has_granularity) { 2130 granularity = 0; 2131 } 2132 if (!has_buf_size) { 2133 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2134 } 2135 2136 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2137 error_set(errp, QERR_INVALID_PARAMETER, device); 2138 return; 2139 } 2140 if (granularity & (granularity - 1)) { 2141 error_set(errp, QERR_INVALID_PARAMETER, device); 2142 return; 2143 } 2144 2145 bs = bdrv_find(device); 2146 if (!bs) { 2147 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2148 return; 2149 } 2150 2151 if (!bdrv_is_inserted(bs)) { 2152 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2153 return; 2154 } 2155 2156 if (!has_format) { 2157 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2158 } 2159 if (format) { 2160 drv = bdrv_find_format(format); 2161 if (!drv) { 2162 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2163 return; 2164 } 2165 } 2166 2167 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2168 return; 2169 } 2170 2171 flags = bs->open_flags | BDRV_O_RDWR; 2172 source = bs->backing_hd; 2173 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2174 sync = MIRROR_SYNC_MODE_FULL; 2175 } 2176 if (sync == MIRROR_SYNC_MODE_NONE) { 2177 source = bs; 2178 } 2179 2180 size = bdrv_getlength(bs); 2181 if (size < 0) { 2182 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2183 return; 2184 } 2185 2186 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2187 && mode != NEW_IMAGE_MODE_EXISTING) 2188 { 2189 /* create new image w/o backing file */ 2190 assert(format && drv); 2191 bdrv_img_create(target, format, 2192 NULL, NULL, NULL, size, flags, &local_err, false); 2193 } else { 2194 switch (mode) { 2195 case NEW_IMAGE_MODE_EXISTING: 2196 break; 2197 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2198 /* create new image with backing file */ 2199 bdrv_img_create(target, format, 2200 source->filename, 2201 source->drv->format_name, 2202 NULL, size, flags, &local_err, false); 2203 break; 2204 default: 2205 abort(); 2206 } 2207 } 2208 2209 if (local_err) { 2210 error_propagate(errp, local_err); 2211 return; 2212 } 2213 2214 /* Mirroring takes care of copy-on-write using the source's backing 2215 * file. 2216 */ 2217 target_bs = NULL; 2218 ret = bdrv_open(&target_bs, target, NULL, NULL, flags | BDRV_O_NO_BACKING, 2219 drv, &local_err); 2220 if (ret < 0) { 2221 error_propagate(errp, local_err); 2222 return; 2223 } 2224 2225 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 2226 on_source_error, on_target_error, 2227 block_job_cb, bs, &local_err); 2228 if (local_err != NULL) { 2229 bdrv_unref(target_bs); 2230 error_propagate(errp, local_err); 2231 return; 2232 } 2233 } 2234 2235 static BlockJob *find_block_job(const char *device) 2236 { 2237 BlockDriverState *bs; 2238 2239 bs = bdrv_find(device); 2240 if (!bs || !bs->job) { 2241 return NULL; 2242 } 2243 return bs->job; 2244 } 2245 2246 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2247 { 2248 BlockJob *job = find_block_job(device); 2249 2250 if (!job) { 2251 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2252 return; 2253 } 2254 2255 block_job_set_speed(job, speed, errp); 2256 } 2257 2258 void qmp_block_job_cancel(const char *device, 2259 bool has_force, bool force, Error **errp) 2260 { 2261 BlockJob *job = find_block_job(device); 2262 2263 if (!has_force) { 2264 force = false; 2265 } 2266 2267 if (!job) { 2268 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2269 return; 2270 } 2271 if (job->paused && !force) { 2272 error_setg(errp, "The block job for device '%s' is currently paused", 2273 device); 2274 return; 2275 } 2276 2277 trace_qmp_block_job_cancel(job); 2278 block_job_cancel(job); 2279 } 2280 2281 void qmp_block_job_pause(const char *device, Error **errp) 2282 { 2283 BlockJob *job = find_block_job(device); 2284 2285 if (!job) { 2286 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2287 return; 2288 } 2289 2290 trace_qmp_block_job_pause(job); 2291 block_job_pause(job); 2292 } 2293 2294 void qmp_block_job_resume(const char *device, Error **errp) 2295 { 2296 BlockJob *job = find_block_job(device); 2297 2298 if (!job) { 2299 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2300 return; 2301 } 2302 2303 trace_qmp_block_job_resume(job); 2304 block_job_resume(job); 2305 } 2306 2307 void qmp_block_job_complete(const char *device, Error **errp) 2308 { 2309 BlockJob *job = find_block_job(device); 2310 2311 if (!job) { 2312 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2313 return; 2314 } 2315 2316 trace_qmp_block_job_complete(job); 2317 block_job_complete(job, errp); 2318 } 2319 2320 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2321 { 2322 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2323 DriveInfo *dinfo; 2324 QObject *obj; 2325 QDict *qdict; 2326 Error *local_err = NULL; 2327 2328 /* Require an ID in the top level */ 2329 if (!options->has_id) { 2330 error_setg(errp, "Block device needs an ID"); 2331 goto fail; 2332 } 2333 2334 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with 2335 * cache.direct=false instead of silently switching to aio=threads, except 2336 * if called from drive_init. 2337 * 2338 * For now, simply forbidding the combination for all drivers will do. */ 2339 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2340 bool direct = options->has_cache && 2341 options->cache->has_direct && 2342 options->cache->direct; 2343 if (!direct) { 2344 error_setg(errp, "aio=native requires cache.direct=true"); 2345 goto fail; 2346 } 2347 } 2348 2349 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2350 &options, NULL, &local_err); 2351 if (local_err) { 2352 error_propagate(errp, local_err); 2353 goto fail; 2354 } 2355 2356 obj = qmp_output_get_qobject(ov); 2357 qdict = qobject_to_qdict(obj); 2358 2359 qdict_flatten(qdict); 2360 2361 dinfo = blockdev_init(NULL, qdict, &local_err); 2362 if (local_err) { 2363 error_propagate(errp, local_err); 2364 goto fail; 2365 } 2366 2367 if (bdrv_key_required(dinfo->bdrv)) { 2368 drive_uninit(dinfo); 2369 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 2370 goto fail; 2371 } 2372 2373 fail: 2374 qmp_output_visitor_cleanup(ov); 2375 } 2376 2377 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 2378 { 2379 BlockJobInfoList **prev = opaque; 2380 BlockJob *job = bs->job; 2381 2382 if (job) { 2383 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2384 elem->value = block_job_query(bs->job); 2385 (*prev)->next = elem; 2386 *prev = elem; 2387 } 2388 } 2389 2390 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2391 { 2392 /* Dummy is a fake list element for holding the head pointer */ 2393 BlockJobInfoList dummy = {}; 2394 BlockJobInfoList *prev = &dummy; 2395 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 2396 return dummy.next; 2397 } 2398 2399 QemuOptsList qemu_common_drive_opts = { 2400 .name = "drive", 2401 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2402 .desc = { 2403 { 2404 .name = "snapshot", 2405 .type = QEMU_OPT_BOOL, 2406 .help = "enable/disable snapshot mode", 2407 },{ 2408 .name = "discard", 2409 .type = QEMU_OPT_STRING, 2410 .help = "discard operation (ignore/off, unmap/on)", 2411 },{ 2412 .name = "cache.writeback", 2413 .type = QEMU_OPT_BOOL, 2414 .help = "enables writeback mode for any caches", 2415 },{ 2416 .name = "cache.direct", 2417 .type = QEMU_OPT_BOOL, 2418 .help = "enables use of O_DIRECT (bypass the host page cache)", 2419 },{ 2420 .name = "cache.no-flush", 2421 .type = QEMU_OPT_BOOL, 2422 .help = "ignore any flush requests for the device", 2423 },{ 2424 .name = "aio", 2425 .type = QEMU_OPT_STRING, 2426 .help = "host AIO implementation (threads, native)", 2427 },{ 2428 .name = "format", 2429 .type = QEMU_OPT_STRING, 2430 .help = "disk format (raw, qcow2, ...)", 2431 },{ 2432 .name = "serial", 2433 .type = QEMU_OPT_STRING, 2434 .help = "disk serial number", 2435 },{ 2436 .name = "rerror", 2437 .type = QEMU_OPT_STRING, 2438 .help = "read error action", 2439 },{ 2440 .name = "werror", 2441 .type = QEMU_OPT_STRING, 2442 .help = "write error action", 2443 },{ 2444 .name = "read-only", 2445 .type = QEMU_OPT_BOOL, 2446 .help = "open drive file as read-only", 2447 },{ 2448 .name = "throttling.iops-total", 2449 .type = QEMU_OPT_NUMBER, 2450 .help = "limit total I/O operations per second", 2451 },{ 2452 .name = "throttling.iops-read", 2453 .type = QEMU_OPT_NUMBER, 2454 .help = "limit read operations per second", 2455 },{ 2456 .name = "throttling.iops-write", 2457 .type = QEMU_OPT_NUMBER, 2458 .help = "limit write operations per second", 2459 },{ 2460 .name = "throttling.bps-total", 2461 .type = QEMU_OPT_NUMBER, 2462 .help = "limit total bytes per second", 2463 },{ 2464 .name = "throttling.bps-read", 2465 .type = QEMU_OPT_NUMBER, 2466 .help = "limit read bytes per second", 2467 },{ 2468 .name = "throttling.bps-write", 2469 .type = QEMU_OPT_NUMBER, 2470 .help = "limit write bytes per second", 2471 },{ 2472 .name = "throttling.iops-total-max", 2473 .type = QEMU_OPT_NUMBER, 2474 .help = "I/O operations burst", 2475 },{ 2476 .name = "throttling.iops-read-max", 2477 .type = QEMU_OPT_NUMBER, 2478 .help = "I/O operations read burst", 2479 },{ 2480 .name = "throttling.iops-write-max", 2481 .type = QEMU_OPT_NUMBER, 2482 .help = "I/O operations write burst", 2483 },{ 2484 .name = "throttling.bps-total-max", 2485 .type = QEMU_OPT_NUMBER, 2486 .help = "total bytes burst", 2487 },{ 2488 .name = "throttling.bps-read-max", 2489 .type = QEMU_OPT_NUMBER, 2490 .help = "total bytes read burst", 2491 },{ 2492 .name = "throttling.bps-write-max", 2493 .type = QEMU_OPT_NUMBER, 2494 .help = "total bytes write burst", 2495 },{ 2496 .name = "throttling.iops-size", 2497 .type = QEMU_OPT_NUMBER, 2498 .help = "when limiting by iops max size of an I/O in bytes", 2499 },{ 2500 .name = "copy-on-read", 2501 .type = QEMU_OPT_BOOL, 2502 .help = "copy read data from backing file into image file", 2503 },{ 2504 .name = "detect-zeroes", 2505 .type = QEMU_OPT_STRING, 2506 .help = "try to optimize zero writes (off, on, unmap)", 2507 }, 2508 { /* end of list */ } 2509 }, 2510 }; 2511 2512 QemuOptsList qemu_drive_opts = { 2513 .name = "drive", 2514 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2515 .desc = { 2516 /* 2517 * no elements => accept any params 2518 * validation will happen later 2519 */ 2520 { /* end of list */ } 2521 }, 2522 }; 2523