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 goto err_no_opts; 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 qemu_opts_del(opts); 568 err_no_opts: 569 QDECREF(bs_opts); 570 return NULL; 571 } 572 573 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to) 574 { 575 const char *value; 576 577 value = qemu_opt_get(opts, from); 578 if (value) { 579 qemu_opt_set(opts, to, value); 580 qemu_opt_unset(opts, from); 581 } 582 } 583 584 QemuOptsList qemu_legacy_drive_opts = { 585 .name = "drive", 586 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 587 .desc = { 588 { 589 .name = "bus", 590 .type = QEMU_OPT_NUMBER, 591 .help = "bus number", 592 },{ 593 .name = "unit", 594 .type = QEMU_OPT_NUMBER, 595 .help = "unit number (i.e. lun for scsi)", 596 },{ 597 .name = "index", 598 .type = QEMU_OPT_NUMBER, 599 .help = "index number", 600 },{ 601 .name = "media", 602 .type = QEMU_OPT_STRING, 603 .help = "media type (disk, cdrom)", 604 },{ 605 .name = "if", 606 .type = QEMU_OPT_STRING, 607 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 608 },{ 609 .name = "cyls", 610 .type = QEMU_OPT_NUMBER, 611 .help = "number of cylinders (ide disk geometry)", 612 },{ 613 .name = "heads", 614 .type = QEMU_OPT_NUMBER, 615 .help = "number of heads (ide disk geometry)", 616 },{ 617 .name = "secs", 618 .type = QEMU_OPT_NUMBER, 619 .help = "number of sectors (ide disk geometry)", 620 },{ 621 .name = "trans", 622 .type = QEMU_OPT_STRING, 623 .help = "chs translation (auto, lba, none)", 624 },{ 625 .name = "boot", 626 .type = QEMU_OPT_BOOL, 627 .help = "(deprecated, ignored)", 628 },{ 629 .name = "addr", 630 .type = QEMU_OPT_STRING, 631 .help = "pci address (virtio only)", 632 },{ 633 .name = "file", 634 .type = QEMU_OPT_STRING, 635 .help = "file name", 636 }, 637 638 /* Options that are passed on, but have special semantics with -drive */ 639 { 640 .name = "read-only", 641 .type = QEMU_OPT_BOOL, 642 .help = "open drive file as read-only", 643 },{ 644 .name = "rerror", 645 .type = QEMU_OPT_STRING, 646 .help = "read error action", 647 },{ 648 .name = "werror", 649 .type = QEMU_OPT_STRING, 650 .help = "write error action", 651 },{ 652 .name = "copy-on-read", 653 .type = QEMU_OPT_BOOL, 654 .help = "copy read data from backing file into image file", 655 }, 656 657 { /* end of list */ } 658 }, 659 }; 660 661 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type) 662 { 663 const char *value; 664 DriveInfo *dinfo = NULL; 665 QDict *bs_opts; 666 QemuOpts *legacy_opts; 667 DriveMediaType media = MEDIA_DISK; 668 BlockInterfaceType type; 669 int cyls, heads, secs, translation; 670 int max_devs, bus_id, unit_id, index; 671 const char *devaddr; 672 const char *werror, *rerror; 673 bool read_only = false; 674 bool copy_on_read; 675 const char *filename; 676 Error *local_err = NULL; 677 678 /* Change legacy command line options into QMP ones */ 679 qemu_opt_rename(all_opts, "iops", "throttling.iops-total"); 680 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read"); 681 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write"); 682 683 qemu_opt_rename(all_opts, "bps", "throttling.bps-total"); 684 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read"); 685 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write"); 686 687 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max"); 688 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max"); 689 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max"); 690 691 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max"); 692 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max"); 693 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max"); 694 695 qemu_opt_rename(all_opts, 696 "iops_size", "throttling.iops-size"); 697 698 qemu_opt_rename(all_opts, "readonly", "read-only"); 699 700 value = qemu_opt_get(all_opts, "cache"); 701 if (value) { 702 int flags = 0; 703 704 if (bdrv_parse_cache_flags(value, &flags) != 0) { 705 error_report("invalid cache option"); 706 return NULL; 707 } 708 709 /* Specific options take precedence */ 710 if (!qemu_opt_get(all_opts, "cache.writeback")) { 711 qemu_opt_set_bool(all_opts, "cache.writeback", 712 !!(flags & BDRV_O_CACHE_WB)); 713 } 714 if (!qemu_opt_get(all_opts, "cache.direct")) { 715 qemu_opt_set_bool(all_opts, "cache.direct", 716 !!(flags & BDRV_O_NOCACHE)); 717 } 718 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 719 qemu_opt_set_bool(all_opts, "cache.no-flush", 720 !!(flags & BDRV_O_NO_FLUSH)); 721 } 722 qemu_opt_unset(all_opts, "cache"); 723 } 724 725 /* Get a QDict for processing the options */ 726 bs_opts = qdict_new(); 727 qemu_opts_to_qdict(all_opts, bs_opts); 728 729 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 730 &error_abort); 731 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 732 if (local_err) { 733 error_report("%s", error_get_pretty(local_err)); 734 error_free(local_err); 735 goto fail; 736 } 737 738 /* Deprecated option boot=[on|off] */ 739 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 740 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 741 "ignored. Future versions will reject this parameter. Please " 742 "update your scripts.\n"); 743 } 744 745 /* Media type */ 746 value = qemu_opt_get(legacy_opts, "media"); 747 if (value) { 748 if (!strcmp(value, "disk")) { 749 media = MEDIA_DISK; 750 } else if (!strcmp(value, "cdrom")) { 751 media = MEDIA_CDROM; 752 read_only = true; 753 } else { 754 error_report("'%s' invalid media", value); 755 goto fail; 756 } 757 } 758 759 /* copy-on-read is disabled with a warning for read-only devices */ 760 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 761 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 762 763 if (read_only && copy_on_read) { 764 error_report("warning: disabling copy-on-read on read-only drive"); 765 copy_on_read = false; 766 } 767 768 qdict_put(bs_opts, "read-only", 769 qstring_from_str(read_only ? "on" : "off")); 770 qdict_put(bs_opts, "copy-on-read", 771 qstring_from_str(copy_on_read ? "on" :"off")); 772 773 /* Controller type */ 774 value = qemu_opt_get(legacy_opts, "if"); 775 if (value) { 776 for (type = 0; 777 type < IF_COUNT && strcmp(value, if_name[type]); 778 type++) { 779 } 780 if (type == IF_COUNT) { 781 error_report("unsupported bus type '%s'", value); 782 goto fail; 783 } 784 } else { 785 type = block_default_type; 786 } 787 788 /* Geometry */ 789 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 790 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 791 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 792 793 if (cyls || heads || secs) { 794 if (cyls < 1) { 795 error_report("invalid physical cyls number"); 796 goto fail; 797 } 798 if (heads < 1) { 799 error_report("invalid physical heads number"); 800 goto fail; 801 } 802 if (secs < 1) { 803 error_report("invalid physical secs number"); 804 goto fail; 805 } 806 } 807 808 translation = BIOS_ATA_TRANSLATION_AUTO; 809 value = qemu_opt_get(legacy_opts, "trans"); 810 if (value != NULL) { 811 if (!cyls) { 812 error_report("'%s' trans must be used with cyls, heads and secs", 813 value); 814 goto fail; 815 } 816 if (!strcmp(value, "none")) { 817 translation = BIOS_ATA_TRANSLATION_NONE; 818 } else if (!strcmp(value, "lba")) { 819 translation = BIOS_ATA_TRANSLATION_LBA; 820 } else if (!strcmp(value, "large")) { 821 translation = BIOS_ATA_TRANSLATION_LARGE; 822 } else if (!strcmp(value, "rechs")) { 823 translation = BIOS_ATA_TRANSLATION_RECHS; 824 } else if (!strcmp(value, "auto")) { 825 translation = BIOS_ATA_TRANSLATION_AUTO; 826 } else { 827 error_report("'%s' invalid translation type", value); 828 goto fail; 829 } 830 } 831 832 if (media == MEDIA_CDROM) { 833 if (cyls || secs || heads) { 834 error_report("CHS can't be set with media=cdrom"); 835 goto fail; 836 } 837 } 838 839 /* Device address specified by bus/unit or index. 840 * If none was specified, try to find the first free one. */ 841 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 842 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 843 index = qemu_opt_get_number(legacy_opts, "index", -1); 844 845 max_devs = if_max_devs[type]; 846 847 if (index != -1) { 848 if (bus_id != 0 || unit_id != -1) { 849 error_report("index cannot be used with bus and unit"); 850 goto fail; 851 } 852 bus_id = drive_index_to_bus_id(type, index); 853 unit_id = drive_index_to_unit_id(type, index); 854 } 855 856 if (unit_id == -1) { 857 unit_id = 0; 858 while (drive_get(type, bus_id, unit_id) != NULL) { 859 unit_id++; 860 if (max_devs && unit_id >= max_devs) { 861 unit_id -= max_devs; 862 bus_id++; 863 } 864 } 865 } 866 867 if (max_devs && unit_id >= max_devs) { 868 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 869 goto fail; 870 } 871 872 if (drive_get(type, bus_id, unit_id) != NULL) { 873 error_report("drive with bus=%d, unit=%d (index=%d) exists", 874 bus_id, unit_id, index); 875 goto fail; 876 } 877 878 /* no id supplied -> create one */ 879 if (qemu_opts_id(all_opts) == NULL) { 880 char *new_id; 881 const char *mediastr = ""; 882 if (type == IF_IDE || type == IF_SCSI) { 883 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 884 } 885 if (max_devs) { 886 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 887 mediastr, unit_id); 888 } else { 889 new_id = g_strdup_printf("%s%s%i", if_name[type], 890 mediastr, unit_id); 891 } 892 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 893 g_free(new_id); 894 } 895 896 /* Add virtio block device */ 897 devaddr = qemu_opt_get(legacy_opts, "addr"); 898 if (devaddr && type != IF_VIRTIO) { 899 error_report("addr is not supported by this bus type"); 900 goto fail; 901 } 902 903 if (type == IF_VIRTIO) { 904 QemuOpts *devopts; 905 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 906 &error_abort); 907 if (arch_type == QEMU_ARCH_S390X) { 908 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 909 } else { 910 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 911 } 912 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 913 if (devaddr) { 914 qemu_opt_set(devopts, "addr", devaddr); 915 } 916 } 917 918 filename = qemu_opt_get(legacy_opts, "file"); 919 920 /* Check werror/rerror compatibility with if=... */ 921 werror = qemu_opt_get(legacy_opts, "werror"); 922 if (werror != NULL) { 923 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 924 type != IF_NONE) { 925 error_report("werror is not supported by this bus type"); 926 goto fail; 927 } 928 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 929 } 930 931 rerror = qemu_opt_get(legacy_opts, "rerror"); 932 if (rerror != NULL) { 933 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 934 type != IF_NONE) { 935 error_report("rerror is not supported by this bus type"); 936 goto fail; 937 } 938 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 939 } 940 941 /* Actual block device init: Functionality shared with blockdev-add */ 942 dinfo = blockdev_init(filename, bs_opts, &local_err); 943 bs_opts = NULL; 944 if (dinfo == NULL) { 945 if (local_err) { 946 error_report("%s", error_get_pretty(local_err)); 947 error_free(local_err); 948 } 949 goto fail; 950 } else { 951 assert(!local_err); 952 } 953 954 /* Set legacy DriveInfo fields */ 955 dinfo->enable_auto_del = true; 956 dinfo->opts = all_opts; 957 958 dinfo->cyls = cyls; 959 dinfo->heads = heads; 960 dinfo->secs = secs; 961 dinfo->trans = translation; 962 963 dinfo->type = type; 964 dinfo->bus = bus_id; 965 dinfo->unit = unit_id; 966 dinfo->devaddr = devaddr; 967 968 switch(type) { 969 case IF_IDE: 970 case IF_SCSI: 971 case IF_XEN: 972 case IF_NONE: 973 dinfo->media_cd = media == MEDIA_CDROM; 974 break; 975 default: 976 break; 977 } 978 979 fail: 980 qemu_opts_del(legacy_opts); 981 QDECREF(bs_opts); 982 return dinfo; 983 } 984 985 void do_commit(Monitor *mon, const QDict *qdict) 986 { 987 const char *device = qdict_get_str(qdict, "device"); 988 BlockDriverState *bs; 989 int ret; 990 991 if (!strcmp(device, "all")) { 992 ret = bdrv_commit_all(); 993 } else { 994 bs = bdrv_find(device); 995 if (!bs) { 996 monitor_printf(mon, "Device '%s' not found\n", device); 997 return; 998 } 999 ret = bdrv_commit(bs); 1000 } 1001 if (ret < 0) { 1002 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1003 strerror(-ret)); 1004 } 1005 } 1006 1007 static void blockdev_do_action(int kind, void *data, Error **errp) 1008 { 1009 TransactionAction action; 1010 TransactionActionList list; 1011 1012 action.kind = kind; 1013 action.data = data; 1014 list.value = &action; 1015 list.next = NULL; 1016 qmp_transaction(&list, errp); 1017 } 1018 1019 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1020 bool has_node_name, const char *node_name, 1021 const char *snapshot_file, 1022 bool has_snapshot_node_name, 1023 const char *snapshot_node_name, 1024 bool has_format, const char *format, 1025 bool has_mode, NewImageMode mode, Error **errp) 1026 { 1027 BlockdevSnapshot snapshot = { 1028 .has_device = has_device, 1029 .device = (char *) device, 1030 .has_node_name = has_node_name, 1031 .node_name = (char *) node_name, 1032 .snapshot_file = (char *) snapshot_file, 1033 .has_snapshot_node_name = has_snapshot_node_name, 1034 .snapshot_node_name = (char *) snapshot_node_name, 1035 .has_format = has_format, 1036 .format = (char *) format, 1037 .has_mode = has_mode, 1038 .mode = mode, 1039 }; 1040 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1041 &snapshot, errp); 1042 } 1043 1044 void qmp_blockdev_snapshot_internal_sync(const char *device, 1045 const char *name, 1046 Error **errp) 1047 { 1048 BlockdevSnapshotInternal snapshot = { 1049 .device = (char *) device, 1050 .name = (char *) name 1051 }; 1052 1053 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1054 &snapshot, errp); 1055 } 1056 1057 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1058 bool has_id, 1059 const char *id, 1060 bool has_name, 1061 const char *name, 1062 Error **errp) 1063 { 1064 BlockDriverState *bs = bdrv_find(device); 1065 QEMUSnapshotInfo sn; 1066 Error *local_err = NULL; 1067 SnapshotInfo *info = NULL; 1068 int ret; 1069 1070 if (!bs) { 1071 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1072 return NULL; 1073 } 1074 1075 if (!has_id) { 1076 id = NULL; 1077 } 1078 1079 if (!has_name) { 1080 name = NULL; 1081 } 1082 1083 if (!id && !name) { 1084 error_setg(errp, "Name or id must be provided"); 1085 return NULL; 1086 } 1087 1088 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1089 if (local_err) { 1090 error_propagate(errp, local_err); 1091 return NULL; 1092 } 1093 if (!ret) { 1094 error_setg(errp, 1095 "Snapshot with id '%s' and name '%s' does not exist on " 1096 "device '%s'", 1097 STR_OR_NULL(id), STR_OR_NULL(name), device); 1098 return NULL; 1099 } 1100 1101 bdrv_snapshot_delete(bs, id, name, &local_err); 1102 if (local_err) { 1103 error_propagate(errp, local_err); 1104 return NULL; 1105 } 1106 1107 info = g_malloc0(sizeof(SnapshotInfo)); 1108 info->id = g_strdup(sn.id_str); 1109 info->name = g_strdup(sn.name); 1110 info->date_nsec = sn.date_nsec; 1111 info->date_sec = sn.date_sec; 1112 info->vm_state_size = sn.vm_state_size; 1113 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1114 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1115 1116 return info; 1117 } 1118 1119 /* New and old BlockDriverState structs for group snapshots */ 1120 1121 typedef struct BlkTransactionState BlkTransactionState; 1122 1123 /* Only prepare() may fail. In a single transaction, only one of commit() or 1124 abort() will be called, clean() will always be called if it present. */ 1125 typedef struct BdrvActionOps { 1126 /* Size of state struct, in bytes. */ 1127 size_t instance_size; 1128 /* Prepare the work, must NOT be NULL. */ 1129 void (*prepare)(BlkTransactionState *common, Error **errp); 1130 /* Commit the changes, can be NULL. */ 1131 void (*commit)(BlkTransactionState *common); 1132 /* Abort the changes on fail, can be NULL. */ 1133 void (*abort)(BlkTransactionState *common); 1134 /* Clean up resource in the end, can be NULL. */ 1135 void (*clean)(BlkTransactionState *common); 1136 } BdrvActionOps; 1137 1138 /* 1139 * This structure must be arranged as first member in child type, assuming 1140 * that compiler will also arrange it to the same address with parent instance. 1141 * Later it will be used in free(). 1142 */ 1143 struct BlkTransactionState { 1144 TransactionAction *action; 1145 const BdrvActionOps *ops; 1146 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1147 }; 1148 1149 /* internal snapshot private data */ 1150 typedef struct InternalSnapshotState { 1151 BlkTransactionState common; 1152 BlockDriverState *bs; 1153 QEMUSnapshotInfo sn; 1154 } InternalSnapshotState; 1155 1156 static void internal_snapshot_prepare(BlkTransactionState *common, 1157 Error **errp) 1158 { 1159 Error *local_err = NULL; 1160 const char *device; 1161 const char *name; 1162 BlockDriverState *bs; 1163 QEMUSnapshotInfo old_sn, *sn; 1164 bool ret; 1165 qemu_timeval tv; 1166 BlockdevSnapshotInternal *internal; 1167 InternalSnapshotState *state; 1168 int ret1; 1169 1170 g_assert(common->action->kind == 1171 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1172 internal = common->action->blockdev_snapshot_internal_sync; 1173 state = DO_UPCAST(InternalSnapshotState, common, common); 1174 1175 /* 1. parse input */ 1176 device = internal->device; 1177 name = internal->name; 1178 1179 /* 2. check for validation */ 1180 bs = bdrv_find(device); 1181 if (!bs) { 1182 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1183 return; 1184 } 1185 1186 if (!bdrv_is_inserted(bs)) { 1187 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1188 return; 1189 } 1190 1191 if (bdrv_is_read_only(bs)) { 1192 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1193 return; 1194 } 1195 1196 if (!bdrv_can_snapshot(bs)) { 1197 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1198 bs->drv->format_name, device, "internal snapshot"); 1199 return; 1200 } 1201 1202 if (!strlen(name)) { 1203 error_setg(errp, "Name is empty"); 1204 return; 1205 } 1206 1207 /* check whether a snapshot with name exist */ 1208 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1209 &local_err); 1210 if (local_err) { 1211 error_propagate(errp, local_err); 1212 return; 1213 } else if (ret) { 1214 error_setg(errp, 1215 "Snapshot with name '%s' already exists on device '%s'", 1216 name, device); 1217 return; 1218 } 1219 1220 /* 3. take the snapshot */ 1221 sn = &state->sn; 1222 pstrcpy(sn->name, sizeof(sn->name), name); 1223 qemu_gettimeofday(&tv); 1224 sn->date_sec = tv.tv_sec; 1225 sn->date_nsec = tv.tv_usec * 1000; 1226 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1227 1228 ret1 = bdrv_snapshot_create(bs, sn); 1229 if (ret1 < 0) { 1230 error_setg_errno(errp, -ret1, 1231 "Failed to create snapshot '%s' on device '%s'", 1232 name, device); 1233 return; 1234 } 1235 1236 /* 4. succeed, mark a snapshot is created */ 1237 state->bs = bs; 1238 } 1239 1240 static void internal_snapshot_abort(BlkTransactionState *common) 1241 { 1242 InternalSnapshotState *state = 1243 DO_UPCAST(InternalSnapshotState, common, common); 1244 BlockDriverState *bs = state->bs; 1245 QEMUSnapshotInfo *sn = &state->sn; 1246 Error *local_error = NULL; 1247 1248 if (!bs) { 1249 return; 1250 } 1251 1252 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1253 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1254 "device '%s' in abort: %s", 1255 sn->id_str, 1256 sn->name, 1257 bdrv_get_device_name(bs), 1258 error_get_pretty(local_error)); 1259 error_free(local_error); 1260 } 1261 } 1262 1263 /* external snapshot private data */ 1264 typedef struct ExternalSnapshotState { 1265 BlkTransactionState common; 1266 BlockDriverState *old_bs; 1267 BlockDriverState *new_bs; 1268 } ExternalSnapshotState; 1269 1270 static void external_snapshot_prepare(BlkTransactionState *common, 1271 Error **errp) 1272 { 1273 BlockDriver *drv; 1274 int flags, ret; 1275 QDict *options = NULL; 1276 Error *local_err = NULL; 1277 bool has_device = false; 1278 const char *device; 1279 bool has_node_name = false; 1280 const char *node_name; 1281 bool has_snapshot_node_name = false; 1282 const char *snapshot_node_name; 1283 const char *new_image_file; 1284 const char *format = "qcow2"; 1285 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1286 ExternalSnapshotState *state = 1287 DO_UPCAST(ExternalSnapshotState, common, common); 1288 TransactionAction *action = common->action; 1289 1290 /* get parameters */ 1291 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1292 1293 has_device = action->blockdev_snapshot_sync->has_device; 1294 device = action->blockdev_snapshot_sync->device; 1295 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1296 node_name = action->blockdev_snapshot_sync->node_name; 1297 has_snapshot_node_name = 1298 action->blockdev_snapshot_sync->has_snapshot_node_name; 1299 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1300 1301 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1302 if (action->blockdev_snapshot_sync->has_format) { 1303 format = action->blockdev_snapshot_sync->format; 1304 } 1305 if (action->blockdev_snapshot_sync->has_mode) { 1306 mode = action->blockdev_snapshot_sync->mode; 1307 } 1308 1309 /* start processing */ 1310 drv = bdrv_find_format(format); 1311 if (!drv) { 1312 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1313 return; 1314 } 1315 1316 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1317 has_node_name ? node_name : NULL, 1318 &local_err); 1319 if (local_err) { 1320 error_propagate(errp, local_err); 1321 return; 1322 } 1323 1324 if (has_node_name && !has_snapshot_node_name) { 1325 error_setg(errp, "New snapshot node name missing"); 1326 return; 1327 } 1328 1329 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1330 error_setg(errp, "New snapshot node name already existing"); 1331 return; 1332 } 1333 1334 if (!bdrv_is_inserted(state->old_bs)) { 1335 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1336 return; 1337 } 1338 1339 if (bdrv_op_is_blocked(state->old_bs, 1340 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1341 return; 1342 } 1343 1344 if (!bdrv_is_read_only(state->old_bs)) { 1345 if (bdrv_flush(state->old_bs)) { 1346 error_set(errp, QERR_IO_ERROR); 1347 return; 1348 } 1349 } 1350 1351 if (!bdrv_is_first_non_filter(state->old_bs)) { 1352 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1353 return; 1354 } 1355 1356 flags = state->old_bs->open_flags; 1357 1358 /* create new image w/backing file */ 1359 if (mode != NEW_IMAGE_MODE_EXISTING) { 1360 bdrv_img_create(new_image_file, format, 1361 state->old_bs->filename, 1362 state->old_bs->drv->format_name, 1363 NULL, -1, flags, &local_err, false); 1364 if (local_err) { 1365 error_propagate(errp, local_err); 1366 return; 1367 } 1368 } 1369 1370 if (has_snapshot_node_name) { 1371 options = qdict_new(); 1372 qdict_put(options, "node-name", 1373 qstring_from_str(snapshot_node_name)); 1374 } 1375 1376 /* TODO Inherit bs->options or only take explicit options with an 1377 * extended QMP command? */ 1378 assert(state->new_bs == NULL); 1379 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1380 flags | BDRV_O_NO_BACKING, drv, &local_err); 1381 /* We will manually add the backing_hd field to the bs later */ 1382 if (ret != 0) { 1383 error_propagate(errp, local_err); 1384 } 1385 } 1386 1387 static void external_snapshot_commit(BlkTransactionState *common) 1388 { 1389 ExternalSnapshotState *state = 1390 DO_UPCAST(ExternalSnapshotState, common, common); 1391 1392 /* This removes our old bs and adds the new bs */ 1393 bdrv_append(state->new_bs, state->old_bs); 1394 /* We don't need (or want) to use the transactional 1395 * bdrv_reopen_multiple() across all the entries at once, because we 1396 * don't want to abort all of them if one of them fails the reopen */ 1397 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1398 NULL); 1399 } 1400 1401 static void external_snapshot_abort(BlkTransactionState *common) 1402 { 1403 ExternalSnapshotState *state = 1404 DO_UPCAST(ExternalSnapshotState, common, common); 1405 if (state->new_bs) { 1406 bdrv_unref(state->new_bs); 1407 } 1408 } 1409 1410 typedef struct DriveBackupState { 1411 BlkTransactionState common; 1412 BlockDriverState *bs; 1413 BlockJob *job; 1414 } DriveBackupState; 1415 1416 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1417 { 1418 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1419 DriveBackup *backup; 1420 Error *local_err = NULL; 1421 1422 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1423 backup = common->action->drive_backup; 1424 1425 qmp_drive_backup(backup->device, backup->target, 1426 backup->has_format, backup->format, 1427 backup->sync, 1428 backup->has_mode, backup->mode, 1429 backup->has_speed, backup->speed, 1430 backup->has_on_source_error, backup->on_source_error, 1431 backup->has_on_target_error, backup->on_target_error, 1432 &local_err); 1433 if (local_err) { 1434 error_propagate(errp, local_err); 1435 state->bs = NULL; 1436 state->job = NULL; 1437 return; 1438 } 1439 1440 state->bs = bdrv_find(backup->device); 1441 state->job = state->bs->job; 1442 } 1443 1444 static void drive_backup_abort(BlkTransactionState *common) 1445 { 1446 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1447 BlockDriverState *bs = state->bs; 1448 1449 /* Only cancel if it's the job we started */ 1450 if (bs && bs->job && bs->job == state->job) { 1451 block_job_cancel_sync(bs->job); 1452 } 1453 } 1454 1455 static void abort_prepare(BlkTransactionState *common, Error **errp) 1456 { 1457 error_setg(errp, "Transaction aborted using Abort action"); 1458 } 1459 1460 static void abort_commit(BlkTransactionState *common) 1461 { 1462 g_assert_not_reached(); /* this action never succeeds */ 1463 } 1464 1465 static const BdrvActionOps actions[] = { 1466 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1467 .instance_size = sizeof(ExternalSnapshotState), 1468 .prepare = external_snapshot_prepare, 1469 .commit = external_snapshot_commit, 1470 .abort = external_snapshot_abort, 1471 }, 1472 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1473 .instance_size = sizeof(DriveBackupState), 1474 .prepare = drive_backup_prepare, 1475 .abort = drive_backup_abort, 1476 }, 1477 [TRANSACTION_ACTION_KIND_ABORT] = { 1478 .instance_size = sizeof(BlkTransactionState), 1479 .prepare = abort_prepare, 1480 .commit = abort_commit, 1481 }, 1482 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1483 .instance_size = sizeof(InternalSnapshotState), 1484 .prepare = internal_snapshot_prepare, 1485 .abort = internal_snapshot_abort, 1486 }, 1487 }; 1488 1489 /* 1490 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1491 * then we do not pivot any of the devices in the group, and abandon the 1492 * snapshots 1493 */ 1494 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1495 { 1496 TransactionActionList *dev_entry = dev_list; 1497 BlkTransactionState *state, *next; 1498 Error *local_err = NULL; 1499 1500 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1501 QSIMPLEQ_INIT(&snap_bdrv_states); 1502 1503 /* drain all i/o before any snapshots */ 1504 bdrv_drain_all(); 1505 1506 /* We don't do anything in this loop that commits us to the snapshot */ 1507 while (NULL != dev_entry) { 1508 TransactionAction *dev_info = NULL; 1509 const BdrvActionOps *ops; 1510 1511 dev_info = dev_entry->value; 1512 dev_entry = dev_entry->next; 1513 1514 assert(dev_info->kind < ARRAY_SIZE(actions)); 1515 1516 ops = &actions[dev_info->kind]; 1517 assert(ops->instance_size > 0); 1518 1519 state = g_malloc0(ops->instance_size); 1520 state->ops = ops; 1521 state->action = dev_info; 1522 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1523 1524 state->ops->prepare(state, &local_err); 1525 if (local_err) { 1526 error_propagate(errp, local_err); 1527 goto delete_and_fail; 1528 } 1529 } 1530 1531 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1532 if (state->ops->commit) { 1533 state->ops->commit(state); 1534 } 1535 } 1536 1537 /* success */ 1538 goto exit; 1539 1540 delete_and_fail: 1541 /* 1542 * failure, and it is all-or-none; abandon each new bs, and keep using 1543 * the original bs for all images 1544 */ 1545 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1546 if (state->ops->abort) { 1547 state->ops->abort(state); 1548 } 1549 } 1550 exit: 1551 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1552 if (state->ops->clean) { 1553 state->ops->clean(state); 1554 } 1555 g_free(state); 1556 } 1557 } 1558 1559 1560 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1561 { 1562 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1563 return; 1564 } 1565 if (!bdrv_dev_has_removable_media(bs)) { 1566 error_setg(errp, "Device '%s' is not removable", 1567 bdrv_get_device_name(bs)); 1568 return; 1569 } 1570 1571 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1572 bdrv_dev_eject_request(bs, force); 1573 if (!force) { 1574 error_setg(errp, "Device '%s' is locked", 1575 bdrv_get_device_name(bs)); 1576 return; 1577 } 1578 } 1579 1580 bdrv_close(bs); 1581 } 1582 1583 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1584 { 1585 BlockDriverState *bs; 1586 1587 bs = bdrv_find(device); 1588 if (!bs) { 1589 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1590 return; 1591 } 1592 1593 eject_device(bs, force, errp); 1594 } 1595 1596 void qmp_block_passwd(bool has_device, const char *device, 1597 bool has_node_name, const char *node_name, 1598 const char *password, Error **errp) 1599 { 1600 Error *local_err = NULL; 1601 BlockDriverState *bs; 1602 int err; 1603 1604 bs = bdrv_lookup_bs(has_device ? device : NULL, 1605 has_node_name ? node_name : NULL, 1606 &local_err); 1607 if (local_err) { 1608 error_propagate(errp, local_err); 1609 return; 1610 } 1611 1612 err = bdrv_set_key(bs, password); 1613 if (err == -EINVAL) { 1614 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1615 return; 1616 } else if (err < 0) { 1617 error_set(errp, QERR_INVALID_PASSWORD); 1618 return; 1619 } 1620 } 1621 1622 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1623 int bdrv_flags, BlockDriver *drv, 1624 const char *password, Error **errp) 1625 { 1626 Error *local_err = NULL; 1627 int ret; 1628 1629 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1630 if (ret < 0) { 1631 error_propagate(errp, local_err); 1632 return; 1633 } 1634 1635 if (bdrv_key_required(bs)) { 1636 if (password) { 1637 if (bdrv_set_key(bs, password) < 0) { 1638 error_set(errp, QERR_INVALID_PASSWORD); 1639 } 1640 } else { 1641 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1642 bdrv_get_encrypted_filename(bs)); 1643 } 1644 } else if (password) { 1645 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1646 } 1647 } 1648 1649 void qmp_change_blockdev(const char *device, const char *filename, 1650 const char *format, Error **errp) 1651 { 1652 BlockDriverState *bs; 1653 BlockDriver *drv = NULL; 1654 int bdrv_flags; 1655 Error *err = NULL; 1656 1657 bs = bdrv_find(device); 1658 if (!bs) { 1659 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1660 return; 1661 } 1662 1663 if (format) { 1664 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1665 if (!drv) { 1666 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1667 return; 1668 } 1669 } 1670 1671 eject_device(bs, 0, &err); 1672 if (err) { 1673 error_propagate(errp, err); 1674 return; 1675 } 1676 1677 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1678 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1679 1680 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1681 } 1682 1683 /* throttling disk I/O limits */ 1684 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1685 int64_t bps_wr, 1686 int64_t iops, 1687 int64_t iops_rd, 1688 int64_t iops_wr, 1689 bool has_bps_max, 1690 int64_t bps_max, 1691 bool has_bps_rd_max, 1692 int64_t bps_rd_max, 1693 bool has_bps_wr_max, 1694 int64_t bps_wr_max, 1695 bool has_iops_max, 1696 int64_t iops_max, 1697 bool has_iops_rd_max, 1698 int64_t iops_rd_max, 1699 bool has_iops_wr_max, 1700 int64_t iops_wr_max, 1701 bool has_iops_size, 1702 int64_t iops_size, Error **errp) 1703 { 1704 ThrottleConfig cfg; 1705 BlockDriverState *bs; 1706 AioContext *aio_context; 1707 1708 bs = bdrv_find(device); 1709 if (!bs) { 1710 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1711 return; 1712 } 1713 1714 memset(&cfg, 0, sizeof(cfg)); 1715 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1716 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1717 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1718 1719 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1720 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1721 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1722 1723 if (has_bps_max) { 1724 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1725 } 1726 if (has_bps_rd_max) { 1727 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1728 } 1729 if (has_bps_wr_max) { 1730 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1731 } 1732 if (has_iops_max) { 1733 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1734 } 1735 if (has_iops_rd_max) { 1736 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1737 } 1738 if (has_iops_wr_max) { 1739 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1740 } 1741 1742 if (has_iops_size) { 1743 cfg.op_size = iops_size; 1744 } 1745 1746 if (!check_throttle_config(&cfg, errp)) { 1747 return; 1748 } 1749 1750 aio_context = bdrv_get_aio_context(bs); 1751 aio_context_acquire(aio_context); 1752 1753 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1754 bdrv_io_limits_enable(bs); 1755 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1756 bdrv_io_limits_disable(bs); 1757 } 1758 1759 if (bs->io_limits_enabled) { 1760 bdrv_set_io_limits(bs, &cfg); 1761 } 1762 1763 aio_context_release(aio_context); 1764 } 1765 1766 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1767 { 1768 const char *id = qdict_get_str(qdict, "id"); 1769 BlockDriverState *bs; 1770 Error *local_err = NULL; 1771 1772 bs = bdrv_find(id); 1773 if (!bs) { 1774 error_report("Device '%s' not found", id); 1775 return -1; 1776 } 1777 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 1778 error_report("%s", error_get_pretty(local_err)); 1779 error_free(local_err); 1780 return -1; 1781 } 1782 1783 /* quiesce block driver; prevent further io */ 1784 bdrv_drain_all(); 1785 bdrv_flush(bs); 1786 bdrv_close(bs); 1787 1788 /* if we have a device attached to this BlockDriverState 1789 * then we need to make the drive anonymous until the device 1790 * can be removed. If this is a drive with no device backing 1791 * then we can just get rid of the block driver state right here. 1792 */ 1793 if (bdrv_get_attached_dev(bs)) { 1794 bdrv_make_anon(bs); 1795 1796 /* Further I/O must not pause the guest */ 1797 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1798 BLOCKDEV_ON_ERROR_REPORT); 1799 } else { 1800 drive_uninit(drive_get_by_blockdev(bs)); 1801 } 1802 1803 return 0; 1804 } 1805 1806 void qmp_block_resize(bool has_device, const char *device, 1807 bool has_node_name, const char *node_name, 1808 int64_t size, Error **errp) 1809 { 1810 Error *local_err = NULL; 1811 BlockDriverState *bs; 1812 int ret; 1813 1814 bs = bdrv_lookup_bs(has_device ? device : NULL, 1815 has_node_name ? node_name : NULL, 1816 &local_err); 1817 if (local_err) { 1818 error_propagate(errp, local_err); 1819 return; 1820 } 1821 1822 if (!bdrv_is_first_non_filter(bs)) { 1823 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 1824 return; 1825 } 1826 1827 if (size < 0) { 1828 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1829 return; 1830 } 1831 1832 /* complete all in-flight operations before resizing the device */ 1833 bdrv_drain_all(); 1834 1835 ret = bdrv_truncate(bs, size); 1836 switch (ret) { 1837 case 0: 1838 break; 1839 case -ENOMEDIUM: 1840 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1841 break; 1842 case -ENOTSUP: 1843 error_set(errp, QERR_UNSUPPORTED); 1844 break; 1845 case -EACCES: 1846 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1847 break; 1848 case -EBUSY: 1849 error_set(errp, QERR_DEVICE_IN_USE, device); 1850 break; 1851 default: 1852 error_setg_errno(errp, -ret, "Could not resize"); 1853 break; 1854 } 1855 } 1856 1857 static void block_job_cb(void *opaque, int ret) 1858 { 1859 BlockDriverState *bs = opaque; 1860 QObject *obj; 1861 1862 trace_block_job_cb(bs, bs->job, ret); 1863 1864 assert(bs->job); 1865 obj = qobject_from_block_job(bs->job); 1866 if (ret < 0) { 1867 QDict *dict = qobject_to_qdict(obj); 1868 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1869 } 1870 1871 if (block_job_is_cancelled(bs->job)) { 1872 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1873 } else { 1874 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1875 } 1876 qobject_decref(obj); 1877 1878 bdrv_put_ref_bh_schedule(bs); 1879 } 1880 1881 void qmp_block_stream(const char *device, bool has_base, 1882 const char *base, bool has_speed, int64_t speed, 1883 bool has_on_error, BlockdevOnError on_error, 1884 Error **errp) 1885 { 1886 BlockDriverState *bs; 1887 BlockDriverState *base_bs = NULL; 1888 Error *local_err = NULL; 1889 1890 if (!has_on_error) { 1891 on_error = BLOCKDEV_ON_ERROR_REPORT; 1892 } 1893 1894 bs = bdrv_find(device); 1895 if (!bs) { 1896 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1897 return; 1898 } 1899 1900 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 1901 return; 1902 } 1903 1904 if (base) { 1905 base_bs = bdrv_find_backing_image(bs, base); 1906 if (base_bs == NULL) { 1907 error_set(errp, QERR_BASE_NOT_FOUND, base); 1908 return; 1909 } 1910 } 1911 1912 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1913 on_error, block_job_cb, bs, &local_err); 1914 if (local_err) { 1915 error_propagate(errp, local_err); 1916 return; 1917 } 1918 1919 trace_qmp_block_stream(bs, bs->job); 1920 } 1921 1922 void qmp_block_commit(const char *device, 1923 bool has_base, const char *base, const char *top, 1924 bool has_speed, int64_t speed, 1925 Error **errp) 1926 { 1927 BlockDriverState *bs; 1928 BlockDriverState *base_bs, *top_bs; 1929 Error *local_err = NULL; 1930 /* This will be part of the QMP command, if/when the 1931 * BlockdevOnError change for blkmirror makes it in 1932 */ 1933 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1934 1935 if (!has_speed) { 1936 speed = 0; 1937 } 1938 1939 /* drain all i/o before commits */ 1940 bdrv_drain_all(); 1941 1942 bs = bdrv_find(device); 1943 if (!bs) { 1944 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1945 return; 1946 } 1947 1948 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) { 1949 return; 1950 } 1951 1952 /* default top_bs is the active layer */ 1953 top_bs = bs; 1954 1955 if (top) { 1956 if (strcmp(bs->filename, top) != 0) { 1957 top_bs = bdrv_find_backing_image(bs, top); 1958 } 1959 } 1960 1961 if (top_bs == NULL) { 1962 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1963 return; 1964 } 1965 1966 if (has_base && base) { 1967 base_bs = bdrv_find_backing_image(top_bs, base); 1968 } else { 1969 base_bs = bdrv_find_base(top_bs); 1970 } 1971 1972 if (base_bs == NULL) { 1973 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1974 return; 1975 } 1976 1977 if (top_bs == bs) { 1978 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 1979 bs, &local_err); 1980 } else { 1981 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1982 &local_err); 1983 } 1984 if (local_err != NULL) { 1985 error_propagate(errp, local_err); 1986 return; 1987 } 1988 } 1989 1990 void qmp_drive_backup(const char *device, const char *target, 1991 bool has_format, const char *format, 1992 enum MirrorSyncMode sync, 1993 bool has_mode, enum NewImageMode mode, 1994 bool has_speed, int64_t speed, 1995 bool has_on_source_error, BlockdevOnError on_source_error, 1996 bool has_on_target_error, BlockdevOnError on_target_error, 1997 Error **errp) 1998 { 1999 BlockDriverState *bs; 2000 BlockDriverState *target_bs; 2001 BlockDriverState *source = NULL; 2002 BlockDriver *drv = NULL; 2003 Error *local_err = NULL; 2004 int flags; 2005 int64_t size; 2006 int ret; 2007 2008 if (!has_speed) { 2009 speed = 0; 2010 } 2011 if (!has_on_source_error) { 2012 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2013 } 2014 if (!has_on_target_error) { 2015 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2016 } 2017 if (!has_mode) { 2018 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2019 } 2020 2021 bs = bdrv_find(device); 2022 if (!bs) { 2023 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2024 return; 2025 } 2026 2027 if (!bdrv_is_inserted(bs)) { 2028 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2029 return; 2030 } 2031 2032 if (!has_format) { 2033 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2034 } 2035 if (format) { 2036 drv = bdrv_find_format(format); 2037 if (!drv) { 2038 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2039 return; 2040 } 2041 } 2042 2043 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2044 return; 2045 } 2046 2047 flags = bs->open_flags | BDRV_O_RDWR; 2048 2049 /* See if we have a backing HD we can use to create our new image 2050 * on top of. */ 2051 if (sync == MIRROR_SYNC_MODE_TOP) { 2052 source = bs->backing_hd; 2053 if (!source) { 2054 sync = MIRROR_SYNC_MODE_FULL; 2055 } 2056 } 2057 if (sync == MIRROR_SYNC_MODE_NONE) { 2058 source = bs; 2059 } 2060 2061 size = bdrv_getlength(bs); 2062 if (size < 0) { 2063 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2064 return; 2065 } 2066 2067 if (mode != NEW_IMAGE_MODE_EXISTING) { 2068 assert(format && drv); 2069 if (source) { 2070 bdrv_img_create(target, format, source->filename, 2071 source->drv->format_name, NULL, 2072 size, flags, &local_err, false); 2073 } else { 2074 bdrv_img_create(target, format, NULL, NULL, NULL, 2075 size, flags, &local_err, false); 2076 } 2077 } 2078 2079 if (local_err) { 2080 error_propagate(errp, local_err); 2081 return; 2082 } 2083 2084 target_bs = NULL; 2085 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2086 if (ret < 0) { 2087 error_propagate(errp, local_err); 2088 return; 2089 } 2090 2091 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2092 block_job_cb, bs, &local_err); 2093 if (local_err != NULL) { 2094 bdrv_unref(target_bs); 2095 error_propagate(errp, local_err); 2096 return; 2097 } 2098 } 2099 2100 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2101 { 2102 return bdrv_named_nodes_list(); 2103 } 2104 2105 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2106 2107 void qmp_drive_mirror(const char *device, const char *target, 2108 bool has_format, const char *format, 2109 enum MirrorSyncMode sync, 2110 bool has_mode, enum NewImageMode mode, 2111 bool has_speed, int64_t speed, 2112 bool has_granularity, uint32_t granularity, 2113 bool has_buf_size, int64_t buf_size, 2114 bool has_on_source_error, BlockdevOnError on_source_error, 2115 bool has_on_target_error, BlockdevOnError on_target_error, 2116 Error **errp) 2117 { 2118 BlockDriverState *bs; 2119 BlockDriverState *source, *target_bs; 2120 BlockDriver *drv = NULL; 2121 Error *local_err = NULL; 2122 int flags; 2123 int64_t size; 2124 int ret; 2125 2126 if (!has_speed) { 2127 speed = 0; 2128 } 2129 if (!has_on_source_error) { 2130 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2131 } 2132 if (!has_on_target_error) { 2133 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2134 } 2135 if (!has_mode) { 2136 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2137 } 2138 if (!has_granularity) { 2139 granularity = 0; 2140 } 2141 if (!has_buf_size) { 2142 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2143 } 2144 2145 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2146 error_set(errp, QERR_INVALID_PARAMETER, device); 2147 return; 2148 } 2149 if (granularity & (granularity - 1)) { 2150 error_set(errp, QERR_INVALID_PARAMETER, device); 2151 return; 2152 } 2153 2154 bs = bdrv_find(device); 2155 if (!bs) { 2156 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2157 return; 2158 } 2159 2160 if (!bdrv_is_inserted(bs)) { 2161 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2162 return; 2163 } 2164 2165 if (!has_format) { 2166 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2167 } 2168 if (format) { 2169 drv = bdrv_find_format(format); 2170 if (!drv) { 2171 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2172 return; 2173 } 2174 } 2175 2176 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2177 return; 2178 } 2179 2180 flags = bs->open_flags | BDRV_O_RDWR; 2181 source = bs->backing_hd; 2182 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2183 sync = MIRROR_SYNC_MODE_FULL; 2184 } 2185 if (sync == MIRROR_SYNC_MODE_NONE) { 2186 source = bs; 2187 } 2188 2189 size = bdrv_getlength(bs); 2190 if (size < 0) { 2191 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2192 return; 2193 } 2194 2195 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2196 && mode != NEW_IMAGE_MODE_EXISTING) 2197 { 2198 /* create new image w/o backing file */ 2199 assert(format && drv); 2200 bdrv_img_create(target, format, 2201 NULL, NULL, NULL, size, flags, &local_err, false); 2202 } else { 2203 switch (mode) { 2204 case NEW_IMAGE_MODE_EXISTING: 2205 break; 2206 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2207 /* create new image with backing file */ 2208 bdrv_img_create(target, format, 2209 source->filename, 2210 source->drv->format_name, 2211 NULL, size, flags, &local_err, false); 2212 break; 2213 default: 2214 abort(); 2215 } 2216 } 2217 2218 if (local_err) { 2219 error_propagate(errp, local_err); 2220 return; 2221 } 2222 2223 /* Mirroring takes care of copy-on-write using the source's backing 2224 * file. 2225 */ 2226 target_bs = NULL; 2227 ret = bdrv_open(&target_bs, target, NULL, NULL, flags | BDRV_O_NO_BACKING, 2228 drv, &local_err); 2229 if (ret < 0) { 2230 error_propagate(errp, local_err); 2231 return; 2232 } 2233 2234 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 2235 on_source_error, on_target_error, 2236 block_job_cb, bs, &local_err); 2237 if (local_err != NULL) { 2238 bdrv_unref(target_bs); 2239 error_propagate(errp, local_err); 2240 return; 2241 } 2242 } 2243 2244 static BlockJob *find_block_job(const char *device) 2245 { 2246 BlockDriverState *bs; 2247 2248 bs = bdrv_find(device); 2249 if (!bs || !bs->job) { 2250 return NULL; 2251 } 2252 return bs->job; 2253 } 2254 2255 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2256 { 2257 BlockJob *job = find_block_job(device); 2258 2259 if (!job) { 2260 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2261 return; 2262 } 2263 2264 block_job_set_speed(job, speed, errp); 2265 } 2266 2267 void qmp_block_job_cancel(const char *device, 2268 bool has_force, bool force, Error **errp) 2269 { 2270 BlockJob *job = find_block_job(device); 2271 2272 if (!has_force) { 2273 force = false; 2274 } 2275 2276 if (!job) { 2277 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2278 return; 2279 } 2280 if (job->paused && !force) { 2281 error_setg(errp, "The block job for device '%s' is currently paused", 2282 device); 2283 return; 2284 } 2285 2286 trace_qmp_block_job_cancel(job); 2287 block_job_cancel(job); 2288 } 2289 2290 void qmp_block_job_pause(const char *device, Error **errp) 2291 { 2292 BlockJob *job = find_block_job(device); 2293 2294 if (!job) { 2295 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2296 return; 2297 } 2298 2299 trace_qmp_block_job_pause(job); 2300 block_job_pause(job); 2301 } 2302 2303 void qmp_block_job_resume(const char *device, Error **errp) 2304 { 2305 BlockJob *job = find_block_job(device); 2306 2307 if (!job) { 2308 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2309 return; 2310 } 2311 2312 trace_qmp_block_job_resume(job); 2313 block_job_resume(job); 2314 } 2315 2316 void qmp_block_job_complete(const char *device, Error **errp) 2317 { 2318 BlockJob *job = find_block_job(device); 2319 2320 if (!job) { 2321 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2322 return; 2323 } 2324 2325 trace_qmp_block_job_complete(job); 2326 block_job_complete(job, errp); 2327 } 2328 2329 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2330 { 2331 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2332 DriveInfo *dinfo; 2333 QObject *obj; 2334 QDict *qdict; 2335 Error *local_err = NULL; 2336 2337 /* Require an ID in the top level */ 2338 if (!options->has_id) { 2339 error_setg(errp, "Block device needs an ID"); 2340 goto fail; 2341 } 2342 2343 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with 2344 * cache.direct=false instead of silently switching to aio=threads, except 2345 * if called from drive_init. 2346 * 2347 * For now, simply forbidding the combination for all drivers will do. */ 2348 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2349 bool direct = options->has_cache && 2350 options->cache->has_direct && 2351 options->cache->direct; 2352 if (!direct) { 2353 error_setg(errp, "aio=native requires cache.direct=true"); 2354 goto fail; 2355 } 2356 } 2357 2358 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2359 &options, NULL, &local_err); 2360 if (local_err) { 2361 error_propagate(errp, local_err); 2362 goto fail; 2363 } 2364 2365 obj = qmp_output_get_qobject(ov); 2366 qdict = qobject_to_qdict(obj); 2367 2368 qdict_flatten(qdict); 2369 2370 dinfo = blockdev_init(NULL, qdict, &local_err); 2371 if (local_err) { 2372 error_propagate(errp, local_err); 2373 goto fail; 2374 } 2375 2376 if (bdrv_key_required(dinfo->bdrv)) { 2377 drive_uninit(dinfo); 2378 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 2379 goto fail; 2380 } 2381 2382 fail: 2383 qmp_output_visitor_cleanup(ov); 2384 } 2385 2386 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 2387 { 2388 BlockJobInfoList **prev = opaque; 2389 BlockJob *job = bs->job; 2390 2391 if (job) { 2392 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2393 elem->value = block_job_query(bs->job); 2394 (*prev)->next = elem; 2395 *prev = elem; 2396 } 2397 } 2398 2399 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2400 { 2401 /* Dummy is a fake list element for holding the head pointer */ 2402 BlockJobInfoList dummy = {}; 2403 BlockJobInfoList *prev = &dummy; 2404 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 2405 return dummy.next; 2406 } 2407 2408 QemuOptsList qemu_common_drive_opts = { 2409 .name = "drive", 2410 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2411 .desc = { 2412 { 2413 .name = "snapshot", 2414 .type = QEMU_OPT_BOOL, 2415 .help = "enable/disable snapshot mode", 2416 },{ 2417 .name = "discard", 2418 .type = QEMU_OPT_STRING, 2419 .help = "discard operation (ignore/off, unmap/on)", 2420 },{ 2421 .name = "cache.writeback", 2422 .type = QEMU_OPT_BOOL, 2423 .help = "enables writeback mode for any caches", 2424 },{ 2425 .name = "cache.direct", 2426 .type = QEMU_OPT_BOOL, 2427 .help = "enables use of O_DIRECT (bypass the host page cache)", 2428 },{ 2429 .name = "cache.no-flush", 2430 .type = QEMU_OPT_BOOL, 2431 .help = "ignore any flush requests for the device", 2432 },{ 2433 .name = "aio", 2434 .type = QEMU_OPT_STRING, 2435 .help = "host AIO implementation (threads, native)", 2436 },{ 2437 .name = "format", 2438 .type = QEMU_OPT_STRING, 2439 .help = "disk format (raw, qcow2, ...)", 2440 },{ 2441 .name = "serial", 2442 .type = QEMU_OPT_STRING, 2443 .help = "disk serial number", 2444 },{ 2445 .name = "rerror", 2446 .type = QEMU_OPT_STRING, 2447 .help = "read error action", 2448 },{ 2449 .name = "werror", 2450 .type = QEMU_OPT_STRING, 2451 .help = "write error action", 2452 },{ 2453 .name = "read-only", 2454 .type = QEMU_OPT_BOOL, 2455 .help = "open drive file as read-only", 2456 },{ 2457 .name = "throttling.iops-total", 2458 .type = QEMU_OPT_NUMBER, 2459 .help = "limit total I/O operations per second", 2460 },{ 2461 .name = "throttling.iops-read", 2462 .type = QEMU_OPT_NUMBER, 2463 .help = "limit read operations per second", 2464 },{ 2465 .name = "throttling.iops-write", 2466 .type = QEMU_OPT_NUMBER, 2467 .help = "limit write operations per second", 2468 },{ 2469 .name = "throttling.bps-total", 2470 .type = QEMU_OPT_NUMBER, 2471 .help = "limit total bytes per second", 2472 },{ 2473 .name = "throttling.bps-read", 2474 .type = QEMU_OPT_NUMBER, 2475 .help = "limit read bytes per second", 2476 },{ 2477 .name = "throttling.bps-write", 2478 .type = QEMU_OPT_NUMBER, 2479 .help = "limit write bytes per second", 2480 },{ 2481 .name = "throttling.iops-total-max", 2482 .type = QEMU_OPT_NUMBER, 2483 .help = "I/O operations burst", 2484 },{ 2485 .name = "throttling.iops-read-max", 2486 .type = QEMU_OPT_NUMBER, 2487 .help = "I/O operations read burst", 2488 },{ 2489 .name = "throttling.iops-write-max", 2490 .type = QEMU_OPT_NUMBER, 2491 .help = "I/O operations write burst", 2492 },{ 2493 .name = "throttling.bps-total-max", 2494 .type = QEMU_OPT_NUMBER, 2495 .help = "total bytes burst", 2496 },{ 2497 .name = "throttling.bps-read-max", 2498 .type = QEMU_OPT_NUMBER, 2499 .help = "total bytes read burst", 2500 },{ 2501 .name = "throttling.bps-write-max", 2502 .type = QEMU_OPT_NUMBER, 2503 .help = "total bytes write burst", 2504 },{ 2505 .name = "throttling.iops-size", 2506 .type = QEMU_OPT_NUMBER, 2507 .help = "when limiting by iops max size of an I/O in bytes", 2508 },{ 2509 .name = "copy-on-read", 2510 .type = QEMU_OPT_BOOL, 2511 .help = "copy read data from backing file into image file", 2512 },{ 2513 .name = "detect-zeroes", 2514 .type = QEMU_OPT_STRING, 2515 .help = "try to optimize zero writes (off, on, unmap)", 2516 }, 2517 { /* end of list */ } 2518 }, 2519 }; 2520 2521 QemuOptsList qemu_drive_opts = { 2522 .name = "drive", 2523 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2524 .desc = { 2525 /* 2526 * no elements => accept any params 2527 * validation will happen later 2528 */ 2529 { /* end of list */ } 2530 }, 2531 }; 2532