1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "sysemu/blockdev.h" 34 #include "hw/block/block.h" 35 #include "block/blockjob.h" 36 #include "monitor/monitor.h" 37 #include "qapi/qmp/qerror.h" 38 #include "qemu/option.h" 39 #include "qemu/config-file.h" 40 #include "qapi/qmp/types.h" 41 #include "qapi-visit.h" 42 #include "qapi/qmp-output-visitor.h" 43 #include "sysemu/sysemu.h" 44 #include "block/block_int.h" 45 #include "qmp-commands.h" 46 #include "trace.h" 47 #include "sysemu/arch_init.h" 48 49 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 50 51 static const char *const if_name[IF_COUNT] = { 52 [IF_NONE] = "none", 53 [IF_IDE] = "ide", 54 [IF_SCSI] = "scsi", 55 [IF_FLOPPY] = "floppy", 56 [IF_PFLASH] = "pflash", 57 [IF_MTD] = "mtd", 58 [IF_SD] = "sd", 59 [IF_VIRTIO] = "virtio", 60 [IF_XEN] = "xen", 61 }; 62 63 static const int if_max_devs[IF_COUNT] = { 64 /* 65 * Do not change these numbers! They govern how drive option 66 * index maps to unit and bus. That mapping is ABI. 67 * 68 * All controllers used to imlement if=T drives need to support 69 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 70 * Otherwise, some index values map to "impossible" bus, unit 71 * values. 72 * 73 * For instance, if you change [IF_SCSI] to 255, -drive 74 * if=scsi,index=12 no longer means bus=1,unit=5, but 75 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 76 * the drive can't be set up. Regression. 77 */ 78 [IF_IDE] = 2, 79 [IF_SCSI] = 7, 80 }; 81 82 /* 83 * We automatically delete the drive when a device using it gets 84 * unplugged. Questionable feature, but we can't just drop it. 85 * Device models call blockdev_mark_auto_del() to schedule the 86 * automatic deletion, and generic qdev code calls blockdev_auto_del() 87 * when deletion is actually safe. 88 */ 89 void blockdev_mark_auto_del(BlockDriverState *bs) 90 { 91 DriveInfo *dinfo = drive_get_by_blockdev(bs); 92 93 if (dinfo && !dinfo->enable_auto_del) { 94 return; 95 } 96 97 if (bs->job) { 98 block_job_cancel(bs->job); 99 } 100 if (dinfo) { 101 dinfo->auto_del = 1; 102 } 103 } 104 105 void blockdev_auto_del(BlockDriverState *bs) 106 { 107 DriveInfo *dinfo = drive_get_by_blockdev(bs); 108 109 if (dinfo && dinfo->auto_del) { 110 drive_put_ref(dinfo); 111 } 112 } 113 114 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 115 { 116 int max_devs = if_max_devs[type]; 117 return max_devs ? index / max_devs : 0; 118 } 119 120 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 121 { 122 int max_devs = if_max_devs[type]; 123 return max_devs ? index % max_devs : index; 124 } 125 126 QemuOpts *drive_def(const char *optstr) 127 { 128 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 129 } 130 131 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 132 const char *optstr) 133 { 134 QemuOpts *opts; 135 char buf[32]; 136 137 opts = drive_def(optstr); 138 if (!opts) { 139 return NULL; 140 } 141 if (type != IF_DEFAULT) { 142 qemu_opt_set(opts, "if", if_name[type]); 143 } 144 if (index >= 0) { 145 snprintf(buf, sizeof(buf), "%d", index); 146 qemu_opt_set(opts, "index", buf); 147 } 148 if (file) 149 qemu_opt_set(opts, "file", file); 150 return opts; 151 } 152 153 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 154 { 155 DriveInfo *dinfo; 156 157 /* seek interface, bus and unit */ 158 159 QTAILQ_FOREACH(dinfo, &drives, next) { 160 if (dinfo->type == type && 161 dinfo->bus == bus && 162 dinfo->unit == unit) 163 return dinfo; 164 } 165 166 return NULL; 167 } 168 169 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 170 { 171 return drive_get(type, 172 drive_index_to_bus_id(type, index), 173 drive_index_to_unit_id(type, index)); 174 } 175 176 int drive_get_max_bus(BlockInterfaceType type) 177 { 178 int max_bus; 179 DriveInfo *dinfo; 180 181 max_bus = -1; 182 QTAILQ_FOREACH(dinfo, &drives, next) { 183 if(dinfo->type == type && 184 dinfo->bus > max_bus) 185 max_bus = dinfo->bus; 186 } 187 return max_bus; 188 } 189 190 /* Get a block device. This should only be used for single-drive devices 191 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 192 appropriate bus. */ 193 DriveInfo *drive_get_next(BlockInterfaceType type) 194 { 195 static int next_block_unit[IF_COUNT]; 196 197 return drive_get(type, 0, next_block_unit[type]++); 198 } 199 200 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 201 { 202 DriveInfo *dinfo; 203 204 QTAILQ_FOREACH(dinfo, &drives, next) { 205 if (dinfo->bdrv == bs) { 206 return dinfo; 207 } 208 } 209 return NULL; 210 } 211 212 static void bdrv_format_print(void *opaque, const char *name) 213 { 214 error_printf(" %s", name); 215 } 216 217 static void drive_uninit(DriveInfo *dinfo) 218 { 219 if (dinfo->opts) { 220 qemu_opts_del(dinfo->opts); 221 } 222 223 bdrv_unref(dinfo->bdrv); 224 g_free(dinfo->id); 225 QTAILQ_REMOVE(&drives, dinfo, next); 226 g_free(dinfo->serial); 227 g_free(dinfo); 228 } 229 230 void drive_put_ref(DriveInfo *dinfo) 231 { 232 assert(dinfo->refcount); 233 if (--dinfo->refcount == 0) { 234 drive_uninit(dinfo); 235 } 236 } 237 238 void drive_get_ref(DriveInfo *dinfo) 239 { 240 dinfo->refcount++; 241 } 242 243 typedef struct { 244 QEMUBH *bh; 245 BlockDriverState *bs; 246 } BDRVPutRefBH; 247 248 static void bdrv_put_ref_bh(void *opaque) 249 { 250 BDRVPutRefBH *s = opaque; 251 252 bdrv_unref(s->bs); 253 qemu_bh_delete(s->bh); 254 g_free(s); 255 } 256 257 /* 258 * Release a BDS reference in a BH 259 * 260 * It is not safe to use bdrv_unref() from a callback function when the callers 261 * still need the BlockDriverState. In such cases we schedule a BH to release 262 * the reference. 263 */ 264 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 265 { 266 BDRVPutRefBH *s; 267 268 s = g_new(BDRVPutRefBH, 1); 269 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 270 s->bs = bs; 271 qemu_bh_schedule(s->bh); 272 } 273 274 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 275 { 276 if (!strcmp(buf, "ignore")) { 277 return BLOCKDEV_ON_ERROR_IGNORE; 278 } else if (!is_read && !strcmp(buf, "enospc")) { 279 return BLOCKDEV_ON_ERROR_ENOSPC; 280 } else if (!strcmp(buf, "stop")) { 281 return BLOCKDEV_ON_ERROR_STOP; 282 } else if (!strcmp(buf, "report")) { 283 return BLOCKDEV_ON_ERROR_REPORT; 284 } else { 285 error_setg(errp, "'%s' invalid %s error action", 286 buf, is_read ? "read" : "write"); 287 return -1; 288 } 289 } 290 291 static inline int parse_enum_option(const char *lookup[], const char *buf, 292 int max, int def, Error **errp) 293 { 294 int i; 295 296 if (!buf) { 297 return def; 298 } 299 300 for (i = 0; i < max; i++) { 301 if (!strcmp(buf, lookup[i])) { 302 return i; 303 } 304 } 305 306 error_setg(errp, "invalid parameter value: %s", buf); 307 return def; 308 } 309 310 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 311 { 312 if (throttle_conflicting(cfg)) { 313 error_setg(errp, "bps/iops/max total values and read/write values" 314 " cannot be used at the same time"); 315 return false; 316 } 317 318 if (!throttle_is_valid(cfg)) { 319 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 320 return false; 321 } 322 323 return true; 324 } 325 326 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 327 328 /* Takes the ownership of bs_opts */ 329 static DriveInfo *blockdev_init(const char *file, QDict *bs_opts, 330 Error **errp) 331 { 332 const char *buf; 333 const char *serial; 334 int ro = 0; 335 int bdrv_flags = 0; 336 int on_read_error, on_write_error; 337 DriveInfo *dinfo; 338 ThrottleConfig cfg; 339 int snapshot = 0; 340 bool copy_on_read; 341 int ret; 342 Error *error = NULL; 343 QemuOpts *opts; 344 const char *id; 345 bool has_driver_specific_opts; 346 BlockdevDetectZeroesOptions detect_zeroes; 347 BlockDriver *drv = NULL; 348 349 /* Check common options by copying from bs_opts to opts, all other options 350 * stay in bs_opts for processing by bdrv_open(). */ 351 id = qdict_get_try_str(bs_opts, "id"); 352 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 353 if (error) { 354 error_propagate(errp, error); 355 return NULL; 356 } 357 358 qemu_opts_absorb_qdict(opts, bs_opts, &error); 359 if (error) { 360 error_propagate(errp, error); 361 goto early_err; 362 } 363 364 if (id) { 365 qdict_del(bs_opts, "id"); 366 } 367 368 has_driver_specific_opts = !!qdict_size(bs_opts); 369 370 /* extract parameters */ 371 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 372 ro = qemu_opt_get_bool(opts, "read-only", 0); 373 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 374 375 serial = qemu_opt_get(opts, "serial"); 376 377 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 378 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 379 error_setg(errp, "invalid discard option"); 380 goto early_err; 381 } 382 } 383 384 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 385 bdrv_flags |= BDRV_O_CACHE_WB; 386 } 387 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 388 bdrv_flags |= BDRV_O_NOCACHE; 389 } 390 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 391 bdrv_flags |= BDRV_O_NO_FLUSH; 392 } 393 394 #ifdef CONFIG_LINUX_AIO 395 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 396 if (!strcmp(buf, "native")) { 397 bdrv_flags |= BDRV_O_NATIVE_AIO; 398 } else if (!strcmp(buf, "threads")) { 399 /* this is the default */ 400 } else { 401 error_setg(errp, "invalid aio option"); 402 goto early_err; 403 } 404 } 405 #endif 406 407 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 408 if (is_help_option(buf)) { 409 error_printf("Supported formats:"); 410 bdrv_iterate_format(bdrv_format_print, NULL); 411 error_printf("\n"); 412 goto early_err; 413 } 414 415 drv = bdrv_find_format(buf); 416 if (!drv) { 417 error_setg(errp, "'%s' invalid format", buf); 418 goto early_err; 419 } 420 } 421 422 /* disk I/O throttling */ 423 memset(&cfg, 0, sizeof(cfg)); 424 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 425 qemu_opt_get_number(opts, "throttling.bps-total", 0); 426 cfg.buckets[THROTTLE_BPS_READ].avg = 427 qemu_opt_get_number(opts, "throttling.bps-read", 0); 428 cfg.buckets[THROTTLE_BPS_WRITE].avg = 429 qemu_opt_get_number(opts, "throttling.bps-write", 0); 430 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 431 qemu_opt_get_number(opts, "throttling.iops-total", 0); 432 cfg.buckets[THROTTLE_OPS_READ].avg = 433 qemu_opt_get_number(opts, "throttling.iops-read", 0); 434 cfg.buckets[THROTTLE_OPS_WRITE].avg = 435 qemu_opt_get_number(opts, "throttling.iops-write", 0); 436 437 cfg.buckets[THROTTLE_BPS_TOTAL].max = 438 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 439 cfg.buckets[THROTTLE_BPS_READ].max = 440 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 441 cfg.buckets[THROTTLE_BPS_WRITE].max = 442 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 443 cfg.buckets[THROTTLE_OPS_TOTAL].max = 444 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 445 cfg.buckets[THROTTLE_OPS_READ].max = 446 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 447 cfg.buckets[THROTTLE_OPS_WRITE].max = 448 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 449 450 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 451 452 if (!check_throttle_config(&cfg, &error)) { 453 error_propagate(errp, error); 454 goto early_err; 455 } 456 457 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 458 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 459 on_write_error = parse_block_error_action(buf, 0, &error); 460 if (error) { 461 error_propagate(errp, error); 462 goto early_err; 463 } 464 } 465 466 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 467 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 468 on_read_error = parse_block_error_action(buf, 1, &error); 469 if (error) { 470 error_propagate(errp, error); 471 goto early_err; 472 } 473 } 474 475 detect_zeroes = 476 parse_enum_option(BlockdevDetectZeroesOptions_lookup, 477 qemu_opt_get(opts, "detect-zeroes"), 478 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 479 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 480 &error); 481 if (error) { 482 error_propagate(errp, error); 483 goto early_err; 484 } 485 486 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 487 !(bdrv_flags & BDRV_O_UNMAP)) { 488 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 489 "without setting discard operation to unmap"); 490 goto early_err; 491 } 492 493 /* init */ 494 dinfo = g_malloc0(sizeof(*dinfo)); 495 dinfo->id = g_strdup(qemu_opts_id(opts)); 496 dinfo->bdrv = bdrv_new(dinfo->id, &error); 497 if (error) { 498 error_propagate(errp, error); 499 goto bdrv_new_err; 500 } 501 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 502 dinfo->bdrv->read_only = ro; 503 dinfo->bdrv->detect_zeroes = detect_zeroes; 504 dinfo->refcount = 1; 505 if (serial != NULL) { 506 dinfo->serial = g_strdup(serial); 507 } 508 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 509 510 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 511 512 /* disk I/O throttling */ 513 if (throttle_enabled(&cfg)) { 514 bdrv_io_limits_enable(dinfo->bdrv); 515 bdrv_set_io_limits(dinfo->bdrv, &cfg); 516 } 517 518 if (!file || !*file) { 519 if (has_driver_specific_opts) { 520 file = NULL; 521 } else { 522 QDECREF(bs_opts); 523 qemu_opts_del(opts); 524 return dinfo; 525 } 526 } 527 if (snapshot) { 528 /* always use cache=unsafe with snapshot */ 529 bdrv_flags &= ~BDRV_O_CACHE_MASK; 530 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 531 } 532 533 if (copy_on_read) { 534 bdrv_flags |= BDRV_O_COPY_ON_READ; 535 } 536 537 if (runstate_check(RUN_STATE_INMIGRATE)) { 538 bdrv_flags |= BDRV_O_INCOMING; 539 } 540 541 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 542 543 QINCREF(bs_opts); 544 ret = bdrv_open(&dinfo->bdrv, file, NULL, bs_opts, bdrv_flags, drv, &error); 545 546 if (ret < 0) { 547 error_setg(errp, "could not open disk image %s: %s", 548 file ?: dinfo->id, error_get_pretty(error)); 549 error_free(error); 550 goto err; 551 } 552 553 if (bdrv_key_required(dinfo->bdrv)) 554 autostart = 0; 555 556 QDECREF(bs_opts); 557 qemu_opts_del(opts); 558 559 return dinfo; 560 561 err: 562 bdrv_unref(dinfo->bdrv); 563 QTAILQ_REMOVE(&drives, dinfo, next); 564 bdrv_new_err: 565 g_free(dinfo->id); 566 g_free(dinfo); 567 early_err: 568 QDECREF(bs_opts); 569 qemu_opts_del(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 qerror_report_err(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 if (dinfo == NULL) { 944 if (local_err) { 945 qerror_report_err(local_err); 946 error_free(local_err); 947 } 948 goto fail; 949 } else { 950 assert(!local_err); 951 } 952 953 /* Set legacy DriveInfo fields */ 954 dinfo->enable_auto_del = true; 955 dinfo->opts = all_opts; 956 957 dinfo->cyls = cyls; 958 dinfo->heads = heads; 959 dinfo->secs = secs; 960 dinfo->trans = translation; 961 962 dinfo->type = type; 963 dinfo->bus = bus_id; 964 dinfo->unit = unit_id; 965 dinfo->devaddr = devaddr; 966 967 switch(type) { 968 case IF_IDE: 969 case IF_SCSI: 970 case IF_XEN: 971 case IF_NONE: 972 dinfo->media_cd = media == MEDIA_CDROM; 973 break; 974 default: 975 break; 976 } 977 978 fail: 979 qemu_opts_del(legacy_opts); 980 return dinfo; 981 } 982 983 void do_commit(Monitor *mon, const QDict *qdict) 984 { 985 const char *device = qdict_get_str(qdict, "device"); 986 BlockDriverState *bs; 987 int ret; 988 989 if (!strcmp(device, "all")) { 990 ret = bdrv_commit_all(); 991 } else { 992 bs = bdrv_find(device); 993 if (!bs) { 994 monitor_printf(mon, "Device '%s' not found\n", device); 995 return; 996 } 997 ret = bdrv_commit(bs); 998 } 999 if (ret < 0) { 1000 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 1001 strerror(-ret)); 1002 } 1003 } 1004 1005 static void blockdev_do_action(int kind, void *data, Error **errp) 1006 { 1007 TransactionAction action; 1008 TransactionActionList list; 1009 1010 action.kind = kind; 1011 action.data = data; 1012 list.value = &action; 1013 list.next = NULL; 1014 qmp_transaction(&list, errp); 1015 } 1016 1017 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1018 bool has_node_name, const char *node_name, 1019 const char *snapshot_file, 1020 bool has_snapshot_node_name, 1021 const char *snapshot_node_name, 1022 bool has_format, const char *format, 1023 bool has_mode, NewImageMode mode, Error **errp) 1024 { 1025 BlockdevSnapshot snapshot = { 1026 .has_device = has_device, 1027 .device = (char *) device, 1028 .has_node_name = has_node_name, 1029 .node_name = (char *) node_name, 1030 .snapshot_file = (char *) snapshot_file, 1031 .has_snapshot_node_name = has_snapshot_node_name, 1032 .snapshot_node_name = (char *) snapshot_node_name, 1033 .has_format = has_format, 1034 .format = (char *) format, 1035 .has_mode = has_mode, 1036 .mode = mode, 1037 }; 1038 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1039 &snapshot, errp); 1040 } 1041 1042 void qmp_blockdev_snapshot_internal_sync(const char *device, 1043 const char *name, 1044 Error **errp) 1045 { 1046 BlockdevSnapshotInternal snapshot = { 1047 .device = (char *) device, 1048 .name = (char *) name 1049 }; 1050 1051 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1052 &snapshot, errp); 1053 } 1054 1055 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1056 bool has_id, 1057 const char *id, 1058 bool has_name, 1059 const char *name, 1060 Error **errp) 1061 { 1062 BlockDriverState *bs = bdrv_find(device); 1063 QEMUSnapshotInfo sn; 1064 Error *local_err = NULL; 1065 SnapshotInfo *info = NULL; 1066 int ret; 1067 1068 if (!bs) { 1069 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1070 return NULL; 1071 } 1072 1073 if (!has_id) { 1074 id = NULL; 1075 } 1076 1077 if (!has_name) { 1078 name = NULL; 1079 } 1080 1081 if (!id && !name) { 1082 error_setg(errp, "Name or id must be provided"); 1083 return NULL; 1084 } 1085 1086 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1087 if (local_err) { 1088 error_propagate(errp, local_err); 1089 return NULL; 1090 } 1091 if (!ret) { 1092 error_setg(errp, 1093 "Snapshot with id '%s' and name '%s' does not exist on " 1094 "device '%s'", 1095 STR_OR_NULL(id), STR_OR_NULL(name), device); 1096 return NULL; 1097 } 1098 1099 bdrv_snapshot_delete(bs, id, name, &local_err); 1100 if (local_err) { 1101 error_propagate(errp, local_err); 1102 return NULL; 1103 } 1104 1105 info = g_malloc0(sizeof(SnapshotInfo)); 1106 info->id = g_strdup(sn.id_str); 1107 info->name = g_strdup(sn.name); 1108 info->date_nsec = sn.date_nsec; 1109 info->date_sec = sn.date_sec; 1110 info->vm_state_size = sn.vm_state_size; 1111 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1112 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1113 1114 return info; 1115 } 1116 1117 /* New and old BlockDriverState structs for group snapshots */ 1118 1119 typedef struct BlkTransactionState BlkTransactionState; 1120 1121 /* Only prepare() may fail. In a single transaction, only one of commit() or 1122 abort() will be called, clean() will always be called if it present. */ 1123 typedef struct BdrvActionOps { 1124 /* Size of state struct, in bytes. */ 1125 size_t instance_size; 1126 /* Prepare the work, must NOT be NULL. */ 1127 void (*prepare)(BlkTransactionState *common, Error **errp); 1128 /* Commit the changes, can be NULL. */ 1129 void (*commit)(BlkTransactionState *common); 1130 /* Abort the changes on fail, can be NULL. */ 1131 void (*abort)(BlkTransactionState *common); 1132 /* Clean up resource in the end, can be NULL. */ 1133 void (*clean)(BlkTransactionState *common); 1134 } BdrvActionOps; 1135 1136 /* 1137 * This structure must be arranged as first member in child type, assuming 1138 * that compiler will also arrange it to the same address with parent instance. 1139 * Later it will be used in free(). 1140 */ 1141 struct BlkTransactionState { 1142 TransactionAction *action; 1143 const BdrvActionOps *ops; 1144 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1145 }; 1146 1147 /* internal snapshot private data */ 1148 typedef struct InternalSnapshotState { 1149 BlkTransactionState common; 1150 BlockDriverState *bs; 1151 QEMUSnapshotInfo sn; 1152 } InternalSnapshotState; 1153 1154 static void internal_snapshot_prepare(BlkTransactionState *common, 1155 Error **errp) 1156 { 1157 Error *local_err = NULL; 1158 const char *device; 1159 const char *name; 1160 BlockDriverState *bs; 1161 QEMUSnapshotInfo old_sn, *sn; 1162 bool ret; 1163 qemu_timeval tv; 1164 BlockdevSnapshotInternal *internal; 1165 InternalSnapshotState *state; 1166 int ret1; 1167 1168 g_assert(common->action->kind == 1169 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1170 internal = common->action->blockdev_snapshot_internal_sync; 1171 state = DO_UPCAST(InternalSnapshotState, common, common); 1172 1173 /* 1. parse input */ 1174 device = internal->device; 1175 name = internal->name; 1176 1177 /* 2. check for validation */ 1178 bs = bdrv_find(device); 1179 if (!bs) { 1180 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1181 return; 1182 } 1183 1184 if (!bdrv_is_inserted(bs)) { 1185 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1186 return; 1187 } 1188 1189 if (bdrv_is_read_only(bs)) { 1190 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1191 return; 1192 } 1193 1194 if (!bdrv_can_snapshot(bs)) { 1195 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1196 bs->drv->format_name, device, "internal snapshot"); 1197 return; 1198 } 1199 1200 if (!strlen(name)) { 1201 error_setg(errp, "Name is empty"); 1202 return; 1203 } 1204 1205 /* check whether a snapshot with name exist */ 1206 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1207 &local_err); 1208 if (local_err) { 1209 error_propagate(errp, local_err); 1210 return; 1211 } else if (ret) { 1212 error_setg(errp, 1213 "Snapshot with name '%s' already exists on device '%s'", 1214 name, device); 1215 return; 1216 } 1217 1218 /* 3. take the snapshot */ 1219 sn = &state->sn; 1220 pstrcpy(sn->name, sizeof(sn->name), name); 1221 qemu_gettimeofday(&tv); 1222 sn->date_sec = tv.tv_sec; 1223 sn->date_nsec = tv.tv_usec * 1000; 1224 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1225 1226 ret1 = bdrv_snapshot_create(bs, sn); 1227 if (ret1 < 0) { 1228 error_setg_errno(errp, -ret1, 1229 "Failed to create snapshot '%s' on device '%s'", 1230 name, device); 1231 return; 1232 } 1233 1234 /* 4. succeed, mark a snapshot is created */ 1235 state->bs = bs; 1236 } 1237 1238 static void internal_snapshot_abort(BlkTransactionState *common) 1239 { 1240 InternalSnapshotState *state = 1241 DO_UPCAST(InternalSnapshotState, common, common); 1242 BlockDriverState *bs = state->bs; 1243 QEMUSnapshotInfo *sn = &state->sn; 1244 Error *local_error = NULL; 1245 1246 if (!bs) { 1247 return; 1248 } 1249 1250 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1251 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1252 "device '%s' in abort: %s", 1253 sn->id_str, 1254 sn->name, 1255 bdrv_get_device_name(bs), 1256 error_get_pretty(local_error)); 1257 error_free(local_error); 1258 } 1259 } 1260 1261 /* external snapshot private data */ 1262 typedef struct ExternalSnapshotState { 1263 BlkTransactionState common; 1264 BlockDriverState *old_bs; 1265 BlockDriverState *new_bs; 1266 } ExternalSnapshotState; 1267 1268 static void external_snapshot_prepare(BlkTransactionState *common, 1269 Error **errp) 1270 { 1271 BlockDriver *drv; 1272 int flags, ret; 1273 QDict *options = NULL; 1274 Error *local_err = NULL; 1275 bool has_device = false; 1276 const char *device; 1277 bool has_node_name = false; 1278 const char *node_name; 1279 bool has_snapshot_node_name = false; 1280 const char *snapshot_node_name; 1281 const char *new_image_file; 1282 const char *format = "qcow2"; 1283 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1284 ExternalSnapshotState *state = 1285 DO_UPCAST(ExternalSnapshotState, common, common); 1286 TransactionAction *action = common->action; 1287 1288 /* get parameters */ 1289 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1290 1291 has_device = action->blockdev_snapshot_sync->has_device; 1292 device = action->blockdev_snapshot_sync->device; 1293 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1294 node_name = action->blockdev_snapshot_sync->node_name; 1295 has_snapshot_node_name = 1296 action->blockdev_snapshot_sync->has_snapshot_node_name; 1297 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1298 1299 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1300 if (action->blockdev_snapshot_sync->has_format) { 1301 format = action->blockdev_snapshot_sync->format; 1302 } 1303 if (action->blockdev_snapshot_sync->has_mode) { 1304 mode = action->blockdev_snapshot_sync->mode; 1305 } 1306 1307 /* start processing */ 1308 drv = bdrv_find_format(format); 1309 if (!drv) { 1310 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1311 return; 1312 } 1313 1314 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1315 has_node_name ? node_name : NULL, 1316 &local_err); 1317 if (local_err) { 1318 error_propagate(errp, local_err); 1319 return; 1320 } 1321 1322 if (has_node_name && !has_snapshot_node_name) { 1323 error_setg(errp, "New snapshot node name missing"); 1324 return; 1325 } 1326 1327 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1328 error_setg(errp, "New snapshot node name already existing"); 1329 return; 1330 } 1331 1332 if (!bdrv_is_inserted(state->old_bs)) { 1333 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1334 return; 1335 } 1336 1337 if (bdrv_in_use(state->old_bs)) { 1338 error_set(errp, QERR_DEVICE_IN_USE, device); 1339 return; 1340 } 1341 1342 if (!bdrv_is_read_only(state->old_bs)) { 1343 if (bdrv_flush(state->old_bs)) { 1344 error_set(errp, QERR_IO_ERROR); 1345 return; 1346 } 1347 } 1348 1349 if (!bdrv_is_first_non_filter(state->old_bs)) { 1350 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1351 return; 1352 } 1353 1354 flags = state->old_bs->open_flags; 1355 1356 /* create new image w/backing file */ 1357 if (mode != NEW_IMAGE_MODE_EXISTING) { 1358 bdrv_img_create(new_image_file, format, 1359 state->old_bs->filename, 1360 state->old_bs->drv->format_name, 1361 NULL, -1, flags, &local_err, false); 1362 if (local_err) { 1363 error_propagate(errp, local_err); 1364 return; 1365 } 1366 } 1367 1368 if (has_snapshot_node_name) { 1369 options = qdict_new(); 1370 qdict_put(options, "node-name", 1371 qstring_from_str(snapshot_node_name)); 1372 } 1373 1374 /* TODO Inherit bs->options or only take explicit options with an 1375 * extended QMP command? */ 1376 assert(state->new_bs == NULL); 1377 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1378 flags | BDRV_O_NO_BACKING, drv, &local_err); 1379 /* We will manually add the backing_hd field to the bs later */ 1380 if (ret != 0) { 1381 error_propagate(errp, local_err); 1382 } 1383 } 1384 1385 static void external_snapshot_commit(BlkTransactionState *common) 1386 { 1387 ExternalSnapshotState *state = 1388 DO_UPCAST(ExternalSnapshotState, common, common); 1389 1390 /* This removes our old bs and adds the new bs */ 1391 bdrv_append(state->new_bs, state->old_bs); 1392 /* We don't need (or want) to use the transactional 1393 * bdrv_reopen_multiple() across all the entries at once, because we 1394 * don't want to abort all of them if one of them fails the reopen */ 1395 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1396 NULL); 1397 } 1398 1399 static void external_snapshot_abort(BlkTransactionState *common) 1400 { 1401 ExternalSnapshotState *state = 1402 DO_UPCAST(ExternalSnapshotState, common, common); 1403 if (state->new_bs) { 1404 bdrv_unref(state->new_bs); 1405 } 1406 } 1407 1408 typedef struct DriveBackupState { 1409 BlkTransactionState common; 1410 BlockDriverState *bs; 1411 BlockJob *job; 1412 } DriveBackupState; 1413 1414 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1415 { 1416 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1417 DriveBackup *backup; 1418 Error *local_err = NULL; 1419 1420 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1421 backup = common->action->drive_backup; 1422 1423 qmp_drive_backup(backup->device, backup->target, 1424 backup->has_format, backup->format, 1425 backup->sync, 1426 backup->has_mode, backup->mode, 1427 backup->has_speed, backup->speed, 1428 backup->has_on_source_error, backup->on_source_error, 1429 backup->has_on_target_error, backup->on_target_error, 1430 &local_err); 1431 if (local_err) { 1432 error_propagate(errp, local_err); 1433 state->bs = NULL; 1434 state->job = NULL; 1435 return; 1436 } 1437 1438 state->bs = bdrv_find(backup->device); 1439 state->job = state->bs->job; 1440 } 1441 1442 static void drive_backup_abort(BlkTransactionState *common) 1443 { 1444 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1445 BlockDriverState *bs = state->bs; 1446 1447 /* Only cancel if it's the job we started */ 1448 if (bs && bs->job && bs->job == state->job) { 1449 block_job_cancel_sync(bs->job); 1450 } 1451 } 1452 1453 static void abort_prepare(BlkTransactionState *common, Error **errp) 1454 { 1455 error_setg(errp, "Transaction aborted using Abort action"); 1456 } 1457 1458 static void abort_commit(BlkTransactionState *common) 1459 { 1460 g_assert_not_reached(); /* this action never succeeds */ 1461 } 1462 1463 static const BdrvActionOps actions[] = { 1464 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1465 .instance_size = sizeof(ExternalSnapshotState), 1466 .prepare = external_snapshot_prepare, 1467 .commit = external_snapshot_commit, 1468 .abort = external_snapshot_abort, 1469 }, 1470 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1471 .instance_size = sizeof(DriveBackupState), 1472 .prepare = drive_backup_prepare, 1473 .abort = drive_backup_abort, 1474 }, 1475 [TRANSACTION_ACTION_KIND_ABORT] = { 1476 .instance_size = sizeof(BlkTransactionState), 1477 .prepare = abort_prepare, 1478 .commit = abort_commit, 1479 }, 1480 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1481 .instance_size = sizeof(InternalSnapshotState), 1482 .prepare = internal_snapshot_prepare, 1483 .abort = internal_snapshot_abort, 1484 }, 1485 }; 1486 1487 /* 1488 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1489 * then we do not pivot any of the devices in the group, and abandon the 1490 * snapshots 1491 */ 1492 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1493 { 1494 TransactionActionList *dev_entry = dev_list; 1495 BlkTransactionState *state, *next; 1496 Error *local_err = NULL; 1497 1498 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1499 QSIMPLEQ_INIT(&snap_bdrv_states); 1500 1501 /* drain all i/o before any snapshots */ 1502 bdrv_drain_all(); 1503 1504 /* We don't do anything in this loop that commits us to the snapshot */ 1505 while (NULL != dev_entry) { 1506 TransactionAction *dev_info = NULL; 1507 const BdrvActionOps *ops; 1508 1509 dev_info = dev_entry->value; 1510 dev_entry = dev_entry->next; 1511 1512 assert(dev_info->kind < ARRAY_SIZE(actions)); 1513 1514 ops = &actions[dev_info->kind]; 1515 assert(ops->instance_size > 0); 1516 1517 state = g_malloc0(ops->instance_size); 1518 state->ops = ops; 1519 state->action = dev_info; 1520 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1521 1522 state->ops->prepare(state, &local_err); 1523 if (local_err) { 1524 error_propagate(errp, local_err); 1525 goto delete_and_fail; 1526 } 1527 } 1528 1529 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1530 if (state->ops->commit) { 1531 state->ops->commit(state); 1532 } 1533 } 1534 1535 /* success */ 1536 goto exit; 1537 1538 delete_and_fail: 1539 /* 1540 * failure, and it is all-or-none; abandon each new bs, and keep using 1541 * the original bs for all images 1542 */ 1543 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1544 if (state->ops->abort) { 1545 state->ops->abort(state); 1546 } 1547 } 1548 exit: 1549 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1550 if (state->ops->clean) { 1551 state->ops->clean(state); 1552 } 1553 g_free(state); 1554 } 1555 } 1556 1557 1558 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1559 { 1560 if (bdrv_in_use(bs)) { 1561 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1562 return; 1563 } 1564 if (!bdrv_dev_has_removable_media(bs)) { 1565 error_setg(errp, "Device '%s' is not removable", 1566 bdrv_get_device_name(bs)); 1567 return; 1568 } 1569 1570 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1571 bdrv_dev_eject_request(bs, force); 1572 if (!force) { 1573 error_setg(errp, "Device '%s' is locked", 1574 bdrv_get_device_name(bs)); 1575 return; 1576 } 1577 } 1578 1579 bdrv_close(bs); 1580 } 1581 1582 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1583 { 1584 BlockDriverState *bs; 1585 1586 bs = bdrv_find(device); 1587 if (!bs) { 1588 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1589 return; 1590 } 1591 1592 eject_device(bs, force, errp); 1593 } 1594 1595 void qmp_block_passwd(bool has_device, const char *device, 1596 bool has_node_name, const char *node_name, 1597 const char *password, Error **errp) 1598 { 1599 Error *local_err = NULL; 1600 BlockDriverState *bs; 1601 int err; 1602 1603 bs = bdrv_lookup_bs(has_device ? device : NULL, 1604 has_node_name ? node_name : NULL, 1605 &local_err); 1606 if (local_err) { 1607 error_propagate(errp, local_err); 1608 return; 1609 } 1610 1611 err = bdrv_set_key(bs, password); 1612 if (err == -EINVAL) { 1613 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1614 return; 1615 } else if (err < 0) { 1616 error_set(errp, QERR_INVALID_PASSWORD); 1617 return; 1618 } 1619 } 1620 1621 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1622 int bdrv_flags, BlockDriver *drv, 1623 const char *password, Error **errp) 1624 { 1625 Error *local_err = NULL; 1626 int ret; 1627 1628 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1629 if (ret < 0) { 1630 error_propagate(errp, local_err); 1631 return; 1632 } 1633 1634 if (bdrv_key_required(bs)) { 1635 if (password) { 1636 if (bdrv_set_key(bs, password) < 0) { 1637 error_set(errp, QERR_INVALID_PASSWORD); 1638 } 1639 } else { 1640 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1641 bdrv_get_encrypted_filename(bs)); 1642 } 1643 } else if (password) { 1644 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1645 } 1646 } 1647 1648 void qmp_change_blockdev(const char *device, const char *filename, 1649 const char *format, Error **errp) 1650 { 1651 BlockDriverState *bs; 1652 BlockDriver *drv = NULL; 1653 int bdrv_flags; 1654 Error *err = NULL; 1655 1656 bs = bdrv_find(device); 1657 if (!bs) { 1658 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1659 return; 1660 } 1661 1662 if (format) { 1663 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1664 if (!drv) { 1665 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1666 return; 1667 } 1668 } 1669 1670 eject_device(bs, 0, &err); 1671 if (err) { 1672 error_propagate(errp, err); 1673 return; 1674 } 1675 1676 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1677 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1678 1679 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1680 } 1681 1682 /* throttling disk I/O limits */ 1683 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1684 int64_t bps_wr, 1685 int64_t iops, 1686 int64_t iops_rd, 1687 int64_t iops_wr, 1688 bool has_bps_max, 1689 int64_t bps_max, 1690 bool has_bps_rd_max, 1691 int64_t bps_rd_max, 1692 bool has_bps_wr_max, 1693 int64_t bps_wr_max, 1694 bool has_iops_max, 1695 int64_t iops_max, 1696 bool has_iops_rd_max, 1697 int64_t iops_rd_max, 1698 bool has_iops_wr_max, 1699 int64_t iops_wr_max, 1700 bool has_iops_size, 1701 int64_t iops_size, Error **errp) 1702 { 1703 ThrottleConfig cfg; 1704 BlockDriverState *bs; 1705 1706 bs = bdrv_find(device); 1707 if (!bs) { 1708 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1709 return; 1710 } 1711 1712 memset(&cfg, 0, sizeof(cfg)); 1713 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1714 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1715 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1716 1717 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1718 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1719 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1720 1721 if (has_bps_max) { 1722 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1723 } 1724 if (has_bps_rd_max) { 1725 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1726 } 1727 if (has_bps_wr_max) { 1728 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1729 } 1730 if (has_iops_max) { 1731 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1732 } 1733 if (has_iops_rd_max) { 1734 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1735 } 1736 if (has_iops_wr_max) { 1737 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1738 } 1739 1740 if (has_iops_size) { 1741 cfg.op_size = iops_size; 1742 } 1743 1744 if (!check_throttle_config(&cfg, errp)) { 1745 return; 1746 } 1747 1748 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1749 bdrv_io_limits_enable(bs); 1750 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1751 bdrv_io_limits_disable(bs); 1752 } 1753 1754 if (bs->io_limits_enabled) { 1755 bdrv_set_io_limits(bs, &cfg); 1756 } 1757 } 1758 1759 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1760 { 1761 const char *id = qdict_get_str(qdict, "id"); 1762 BlockDriverState *bs; 1763 1764 bs = bdrv_find(id); 1765 if (!bs) { 1766 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1767 return -1; 1768 } 1769 if (bdrv_in_use(bs)) { 1770 qerror_report(QERR_DEVICE_IN_USE, id); 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 (base) { 1892 base_bs = bdrv_find_backing_image(bs, base); 1893 if (base_bs == NULL) { 1894 error_set(errp, QERR_BASE_NOT_FOUND, base); 1895 return; 1896 } 1897 } 1898 1899 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1900 on_error, block_job_cb, bs, &local_err); 1901 if (local_err) { 1902 error_propagate(errp, local_err); 1903 return; 1904 } 1905 1906 trace_qmp_block_stream(bs, bs->job); 1907 } 1908 1909 void qmp_block_commit(const char *device, 1910 bool has_base, const char *base, const char *top, 1911 bool has_speed, int64_t speed, 1912 Error **errp) 1913 { 1914 BlockDriverState *bs; 1915 BlockDriverState *base_bs, *top_bs; 1916 Error *local_err = NULL; 1917 /* This will be part of the QMP command, if/when the 1918 * BlockdevOnError change for blkmirror makes it in 1919 */ 1920 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1921 1922 if (!has_speed) { 1923 speed = 0; 1924 } 1925 1926 /* drain all i/o before commits */ 1927 bdrv_drain_all(); 1928 1929 bs = bdrv_find(device); 1930 if (!bs) { 1931 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1932 return; 1933 } 1934 1935 /* default top_bs is the active layer */ 1936 top_bs = bs; 1937 1938 if (top) { 1939 if (strcmp(bs->filename, top) != 0) { 1940 top_bs = bdrv_find_backing_image(bs, top); 1941 } 1942 } 1943 1944 if (top_bs == NULL) { 1945 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1946 return; 1947 } 1948 1949 if (has_base && base) { 1950 base_bs = bdrv_find_backing_image(top_bs, base); 1951 } else { 1952 base_bs = bdrv_find_base(top_bs); 1953 } 1954 1955 if (base_bs == NULL) { 1956 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1957 return; 1958 } 1959 1960 if (top_bs == bs) { 1961 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 1962 bs, &local_err); 1963 } else { 1964 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1965 &local_err); 1966 } 1967 if (local_err != NULL) { 1968 error_propagate(errp, local_err); 1969 return; 1970 } 1971 } 1972 1973 void qmp_drive_backup(const char *device, const char *target, 1974 bool has_format, const char *format, 1975 enum MirrorSyncMode sync, 1976 bool has_mode, enum NewImageMode mode, 1977 bool has_speed, int64_t speed, 1978 bool has_on_source_error, BlockdevOnError on_source_error, 1979 bool has_on_target_error, BlockdevOnError on_target_error, 1980 Error **errp) 1981 { 1982 BlockDriverState *bs; 1983 BlockDriverState *target_bs; 1984 BlockDriverState *source = NULL; 1985 BlockDriver *drv = NULL; 1986 Error *local_err = NULL; 1987 int flags; 1988 int64_t size; 1989 int ret; 1990 1991 if (!has_speed) { 1992 speed = 0; 1993 } 1994 if (!has_on_source_error) { 1995 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1996 } 1997 if (!has_on_target_error) { 1998 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1999 } 2000 if (!has_mode) { 2001 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2002 } 2003 2004 bs = bdrv_find(device); 2005 if (!bs) { 2006 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2007 return; 2008 } 2009 2010 if (!bdrv_is_inserted(bs)) { 2011 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2012 return; 2013 } 2014 2015 if (!has_format) { 2016 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2017 } 2018 if (format) { 2019 drv = bdrv_find_format(format); 2020 if (!drv) { 2021 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2022 return; 2023 } 2024 } 2025 2026 if (bdrv_in_use(bs)) { 2027 error_set(errp, QERR_DEVICE_IN_USE, device); 2028 return; 2029 } 2030 2031 flags = bs->open_flags | BDRV_O_RDWR; 2032 2033 /* See if we have a backing HD we can use to create our new image 2034 * on top of. */ 2035 if (sync == MIRROR_SYNC_MODE_TOP) { 2036 source = bs->backing_hd; 2037 if (!source) { 2038 sync = MIRROR_SYNC_MODE_FULL; 2039 } 2040 } 2041 if (sync == MIRROR_SYNC_MODE_NONE) { 2042 source = bs; 2043 } 2044 2045 size = bdrv_getlength(bs); 2046 if (size < 0) { 2047 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2048 return; 2049 } 2050 2051 if (mode != NEW_IMAGE_MODE_EXISTING) { 2052 assert(format && drv); 2053 if (source) { 2054 bdrv_img_create(target, format, source->filename, 2055 source->drv->format_name, NULL, 2056 size, flags, &local_err, false); 2057 } else { 2058 bdrv_img_create(target, format, NULL, NULL, NULL, 2059 size, flags, &local_err, false); 2060 } 2061 } 2062 2063 if (local_err) { 2064 error_propagate(errp, local_err); 2065 return; 2066 } 2067 2068 target_bs = NULL; 2069 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2070 if (ret < 0) { 2071 error_propagate(errp, local_err); 2072 return; 2073 } 2074 2075 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2076 block_job_cb, bs, &local_err); 2077 if (local_err != NULL) { 2078 bdrv_unref(target_bs); 2079 error_propagate(errp, local_err); 2080 return; 2081 } 2082 } 2083 2084 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2085 { 2086 return bdrv_named_nodes_list(); 2087 } 2088 2089 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2090 2091 void qmp_drive_mirror(const char *device, const char *target, 2092 bool has_format, const char *format, 2093 enum MirrorSyncMode sync, 2094 bool has_mode, enum NewImageMode mode, 2095 bool has_speed, int64_t speed, 2096 bool has_granularity, uint32_t granularity, 2097 bool has_buf_size, int64_t buf_size, 2098 bool has_on_source_error, BlockdevOnError on_source_error, 2099 bool has_on_target_error, BlockdevOnError on_target_error, 2100 Error **errp) 2101 { 2102 BlockDriverState *bs; 2103 BlockDriverState *source, *target_bs; 2104 BlockDriver *drv = NULL; 2105 Error *local_err = NULL; 2106 int flags; 2107 int64_t size; 2108 int ret; 2109 2110 if (!has_speed) { 2111 speed = 0; 2112 } 2113 if (!has_on_source_error) { 2114 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2115 } 2116 if (!has_on_target_error) { 2117 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2118 } 2119 if (!has_mode) { 2120 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2121 } 2122 if (!has_granularity) { 2123 granularity = 0; 2124 } 2125 if (!has_buf_size) { 2126 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2127 } 2128 2129 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2130 error_set(errp, QERR_INVALID_PARAMETER, device); 2131 return; 2132 } 2133 if (granularity & (granularity - 1)) { 2134 error_set(errp, QERR_INVALID_PARAMETER, device); 2135 return; 2136 } 2137 2138 bs = bdrv_find(device); 2139 if (!bs) { 2140 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2141 return; 2142 } 2143 2144 if (!bdrv_is_inserted(bs)) { 2145 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2146 return; 2147 } 2148 2149 if (!has_format) { 2150 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2151 } 2152 if (format) { 2153 drv = bdrv_find_format(format); 2154 if (!drv) { 2155 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2156 return; 2157 } 2158 } 2159 2160 if (bdrv_in_use(bs)) { 2161 error_set(errp, QERR_DEVICE_IN_USE, device); 2162 return; 2163 } 2164 2165 flags = bs->open_flags | BDRV_O_RDWR; 2166 source = bs->backing_hd; 2167 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2168 sync = MIRROR_SYNC_MODE_FULL; 2169 } 2170 if (sync == MIRROR_SYNC_MODE_NONE) { 2171 source = bs; 2172 } 2173 2174 size = bdrv_getlength(bs); 2175 if (size < 0) { 2176 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2177 return; 2178 } 2179 2180 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2181 && mode != NEW_IMAGE_MODE_EXISTING) 2182 { 2183 /* create new image w/o backing file */ 2184 assert(format && drv); 2185 bdrv_img_create(target, format, 2186 NULL, NULL, NULL, size, flags, &local_err, false); 2187 } else { 2188 switch (mode) { 2189 case NEW_IMAGE_MODE_EXISTING: 2190 break; 2191 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2192 /* create new image with backing file */ 2193 bdrv_img_create(target, format, 2194 source->filename, 2195 source->drv->format_name, 2196 NULL, size, flags, &local_err, false); 2197 break; 2198 default: 2199 abort(); 2200 } 2201 } 2202 2203 if (local_err) { 2204 error_propagate(errp, local_err); 2205 return; 2206 } 2207 2208 /* Mirroring takes care of copy-on-write using the source's backing 2209 * file. 2210 */ 2211 target_bs = NULL; 2212 ret = bdrv_open(&target_bs, target, NULL, NULL, flags | BDRV_O_NO_BACKING, 2213 drv, &local_err); 2214 if (ret < 0) { 2215 error_propagate(errp, local_err); 2216 return; 2217 } 2218 2219 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 2220 on_source_error, on_target_error, 2221 block_job_cb, bs, &local_err); 2222 if (local_err != NULL) { 2223 bdrv_unref(target_bs); 2224 error_propagate(errp, local_err); 2225 return; 2226 } 2227 } 2228 2229 static BlockJob *find_block_job(const char *device) 2230 { 2231 BlockDriverState *bs; 2232 2233 bs = bdrv_find(device); 2234 if (!bs || !bs->job) { 2235 return NULL; 2236 } 2237 return bs->job; 2238 } 2239 2240 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2241 { 2242 BlockJob *job = find_block_job(device); 2243 2244 if (!job) { 2245 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2246 return; 2247 } 2248 2249 block_job_set_speed(job, speed, errp); 2250 } 2251 2252 void qmp_block_job_cancel(const char *device, 2253 bool has_force, bool force, Error **errp) 2254 { 2255 BlockJob *job = find_block_job(device); 2256 2257 if (!has_force) { 2258 force = false; 2259 } 2260 2261 if (!job) { 2262 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2263 return; 2264 } 2265 if (job->paused && !force) { 2266 error_setg(errp, "The block job for device '%s' is currently paused", 2267 device); 2268 return; 2269 } 2270 2271 trace_qmp_block_job_cancel(job); 2272 block_job_cancel(job); 2273 } 2274 2275 void qmp_block_job_pause(const char *device, Error **errp) 2276 { 2277 BlockJob *job = find_block_job(device); 2278 2279 if (!job) { 2280 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2281 return; 2282 } 2283 2284 trace_qmp_block_job_pause(job); 2285 block_job_pause(job); 2286 } 2287 2288 void qmp_block_job_resume(const char *device, Error **errp) 2289 { 2290 BlockJob *job = find_block_job(device); 2291 2292 if (!job) { 2293 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2294 return; 2295 } 2296 2297 trace_qmp_block_job_resume(job); 2298 block_job_resume(job); 2299 } 2300 2301 void qmp_block_job_complete(const char *device, Error **errp) 2302 { 2303 BlockJob *job = find_block_job(device); 2304 2305 if (!job) { 2306 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2307 return; 2308 } 2309 2310 trace_qmp_block_job_complete(job); 2311 block_job_complete(job, errp); 2312 } 2313 2314 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2315 { 2316 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2317 DriveInfo *dinfo; 2318 QObject *obj; 2319 QDict *qdict; 2320 Error *local_err = NULL; 2321 2322 /* Require an ID in the top level */ 2323 if (!options->has_id) { 2324 error_setg(errp, "Block device needs an ID"); 2325 goto fail; 2326 } 2327 2328 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with 2329 * cache.direct=false instead of silently switching to aio=threads, except 2330 * if called from drive_init. 2331 * 2332 * For now, simply forbidding the combination for all drivers will do. */ 2333 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2334 bool direct = options->has_cache && 2335 options->cache->has_direct && 2336 options->cache->direct; 2337 if (!direct) { 2338 error_setg(errp, "aio=native requires cache.direct=true"); 2339 goto fail; 2340 } 2341 } 2342 2343 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2344 &options, NULL, &local_err); 2345 if (local_err) { 2346 error_propagate(errp, local_err); 2347 goto fail; 2348 } 2349 2350 obj = qmp_output_get_qobject(ov); 2351 qdict = qobject_to_qdict(obj); 2352 2353 qdict_flatten(qdict); 2354 2355 dinfo = blockdev_init(NULL, qdict, &local_err); 2356 if (local_err) { 2357 error_propagate(errp, local_err); 2358 goto fail; 2359 } 2360 2361 if (bdrv_key_required(dinfo->bdrv)) { 2362 drive_uninit(dinfo); 2363 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 2364 goto fail; 2365 } 2366 2367 fail: 2368 qmp_output_visitor_cleanup(ov); 2369 } 2370 2371 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 2372 { 2373 BlockJobInfoList **prev = opaque; 2374 BlockJob *job = bs->job; 2375 2376 if (job) { 2377 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2378 elem->value = block_job_query(bs->job); 2379 (*prev)->next = elem; 2380 *prev = elem; 2381 } 2382 } 2383 2384 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2385 { 2386 /* Dummy is a fake list element for holding the head pointer */ 2387 BlockJobInfoList dummy = {}; 2388 BlockJobInfoList *prev = &dummy; 2389 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 2390 return dummy.next; 2391 } 2392 2393 QemuOptsList qemu_common_drive_opts = { 2394 .name = "drive", 2395 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2396 .desc = { 2397 { 2398 .name = "snapshot", 2399 .type = QEMU_OPT_BOOL, 2400 .help = "enable/disable snapshot mode", 2401 },{ 2402 .name = "discard", 2403 .type = QEMU_OPT_STRING, 2404 .help = "discard operation (ignore/off, unmap/on)", 2405 },{ 2406 .name = "cache.writeback", 2407 .type = QEMU_OPT_BOOL, 2408 .help = "enables writeback mode for any caches", 2409 },{ 2410 .name = "cache.direct", 2411 .type = QEMU_OPT_BOOL, 2412 .help = "enables use of O_DIRECT (bypass the host page cache)", 2413 },{ 2414 .name = "cache.no-flush", 2415 .type = QEMU_OPT_BOOL, 2416 .help = "ignore any flush requests for the device", 2417 },{ 2418 .name = "aio", 2419 .type = QEMU_OPT_STRING, 2420 .help = "host AIO implementation (threads, native)", 2421 },{ 2422 .name = "format", 2423 .type = QEMU_OPT_STRING, 2424 .help = "disk format (raw, qcow2, ...)", 2425 },{ 2426 .name = "serial", 2427 .type = QEMU_OPT_STRING, 2428 .help = "disk serial number", 2429 },{ 2430 .name = "rerror", 2431 .type = QEMU_OPT_STRING, 2432 .help = "read error action", 2433 },{ 2434 .name = "werror", 2435 .type = QEMU_OPT_STRING, 2436 .help = "write error action", 2437 },{ 2438 .name = "read-only", 2439 .type = QEMU_OPT_BOOL, 2440 .help = "open drive file as read-only", 2441 },{ 2442 .name = "throttling.iops-total", 2443 .type = QEMU_OPT_NUMBER, 2444 .help = "limit total I/O operations per second", 2445 },{ 2446 .name = "throttling.iops-read", 2447 .type = QEMU_OPT_NUMBER, 2448 .help = "limit read operations per second", 2449 },{ 2450 .name = "throttling.iops-write", 2451 .type = QEMU_OPT_NUMBER, 2452 .help = "limit write operations per second", 2453 },{ 2454 .name = "throttling.bps-total", 2455 .type = QEMU_OPT_NUMBER, 2456 .help = "limit total bytes per second", 2457 },{ 2458 .name = "throttling.bps-read", 2459 .type = QEMU_OPT_NUMBER, 2460 .help = "limit read bytes per second", 2461 },{ 2462 .name = "throttling.bps-write", 2463 .type = QEMU_OPT_NUMBER, 2464 .help = "limit write bytes per second", 2465 },{ 2466 .name = "throttling.iops-total-max", 2467 .type = QEMU_OPT_NUMBER, 2468 .help = "I/O operations burst", 2469 },{ 2470 .name = "throttling.iops-read-max", 2471 .type = QEMU_OPT_NUMBER, 2472 .help = "I/O operations read burst", 2473 },{ 2474 .name = "throttling.iops-write-max", 2475 .type = QEMU_OPT_NUMBER, 2476 .help = "I/O operations write burst", 2477 },{ 2478 .name = "throttling.bps-total-max", 2479 .type = QEMU_OPT_NUMBER, 2480 .help = "total bytes burst", 2481 },{ 2482 .name = "throttling.bps-read-max", 2483 .type = QEMU_OPT_NUMBER, 2484 .help = "total bytes read burst", 2485 },{ 2486 .name = "throttling.bps-write-max", 2487 .type = QEMU_OPT_NUMBER, 2488 .help = "total bytes write burst", 2489 },{ 2490 .name = "throttling.iops-size", 2491 .type = QEMU_OPT_NUMBER, 2492 .help = "when limiting by iops max size of an I/O in bytes", 2493 },{ 2494 .name = "copy-on-read", 2495 .type = QEMU_OPT_BOOL, 2496 .help = "copy read data from backing file into image file", 2497 },{ 2498 .name = "detect-zeroes", 2499 .type = QEMU_OPT_STRING, 2500 .help = "try to optimize zero writes (off, on, unmap)", 2501 }, 2502 { /* end of list */ } 2503 }, 2504 }; 2505 2506 QemuOptsList qemu_drive_opts = { 2507 .name = "drive", 2508 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2509 .desc = { 2510 /* 2511 * no elements => accept any params 2512 * validation will happen later 2513 */ 2514 { /* end of list */ } 2515 }, 2516 }; 2517