1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "sysemu/blockdev.h" 34 #include "hw/block/block.h" 35 #include "block/blockjob.h" 36 #include "monitor/monitor.h" 37 #include "qapi/qmp/qerror.h" 38 #include "qemu/option.h" 39 #include "qemu/config-file.h" 40 #include "qapi/qmp/types.h" 41 #include "qapi-visit.h" 42 #include "qapi/qmp-output-visitor.h" 43 #include "sysemu/sysemu.h" 44 #include "block/block_int.h" 45 #include "qmp-commands.h" 46 #include "trace.h" 47 #include "sysemu/arch_init.h" 48 49 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 50 51 static const char *const if_name[IF_COUNT] = { 52 [IF_NONE] = "none", 53 [IF_IDE] = "ide", 54 [IF_SCSI] = "scsi", 55 [IF_FLOPPY] = "floppy", 56 [IF_PFLASH] = "pflash", 57 [IF_MTD] = "mtd", 58 [IF_SD] = "sd", 59 [IF_VIRTIO] = "virtio", 60 [IF_XEN] = "xen", 61 }; 62 63 static const int if_max_devs[IF_COUNT] = { 64 /* 65 * Do not change these numbers! They govern how drive option 66 * index maps to unit and bus. That mapping is ABI. 67 * 68 * All controllers used to imlement if=T drives need to support 69 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 70 * Otherwise, some index values map to "impossible" bus, unit 71 * values. 72 * 73 * For instance, if you change [IF_SCSI] to 255, -drive 74 * if=scsi,index=12 no longer means bus=1,unit=5, but 75 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 76 * the drive can't be set up. Regression. 77 */ 78 [IF_IDE] = 2, 79 [IF_SCSI] = 7, 80 }; 81 82 /* 83 * We automatically delete the drive when a device using it gets 84 * unplugged. Questionable feature, but we can't just drop it. 85 * Device models call blockdev_mark_auto_del() to schedule the 86 * automatic deletion, and generic qdev code calls blockdev_auto_del() 87 * when deletion is actually safe. 88 */ 89 void blockdev_mark_auto_del(BlockDriverState *bs) 90 { 91 DriveInfo *dinfo = drive_get_by_blockdev(bs); 92 93 if (dinfo && !dinfo->enable_auto_del) { 94 return; 95 } 96 97 if (bs->job) { 98 block_job_cancel(bs->job); 99 } 100 if (dinfo) { 101 dinfo->auto_del = 1; 102 } 103 } 104 105 void blockdev_auto_del(BlockDriverState *bs) 106 { 107 DriveInfo *dinfo = drive_get_by_blockdev(bs); 108 109 if (dinfo && dinfo->auto_del) { 110 drive_put_ref(dinfo); 111 } 112 } 113 114 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 115 { 116 int max_devs = if_max_devs[type]; 117 return max_devs ? index / max_devs : 0; 118 } 119 120 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 121 { 122 int max_devs = if_max_devs[type]; 123 return max_devs ? index % max_devs : index; 124 } 125 126 QemuOpts *drive_def(const char *optstr) 127 { 128 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 129 } 130 131 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 132 const char *optstr) 133 { 134 QemuOpts *opts; 135 char buf[32]; 136 137 opts = drive_def(optstr); 138 if (!opts) { 139 return NULL; 140 } 141 if (type != IF_DEFAULT) { 142 qemu_opt_set(opts, "if", if_name[type]); 143 } 144 if (index >= 0) { 145 snprintf(buf, sizeof(buf), "%d", index); 146 qemu_opt_set(opts, "index", buf); 147 } 148 if (file) 149 qemu_opt_set(opts, "file", file); 150 return opts; 151 } 152 153 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 154 { 155 DriveInfo *dinfo; 156 157 /* seek interface, bus and unit */ 158 159 QTAILQ_FOREACH(dinfo, &drives, next) { 160 if (dinfo->type == type && 161 dinfo->bus == bus && 162 dinfo->unit == unit) 163 return dinfo; 164 } 165 166 return NULL; 167 } 168 169 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 170 { 171 return drive_get(type, 172 drive_index_to_bus_id(type, index), 173 drive_index_to_unit_id(type, index)); 174 } 175 176 int drive_get_max_bus(BlockInterfaceType type) 177 { 178 int max_bus; 179 DriveInfo *dinfo; 180 181 max_bus = -1; 182 QTAILQ_FOREACH(dinfo, &drives, next) { 183 if(dinfo->type == type && 184 dinfo->bus > max_bus) 185 max_bus = dinfo->bus; 186 } 187 return max_bus; 188 } 189 190 /* Get a block device. This should only be used for single-drive devices 191 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 192 appropriate bus. */ 193 DriveInfo *drive_get_next(BlockInterfaceType type) 194 { 195 static int next_block_unit[IF_COUNT]; 196 197 return drive_get(type, 0, next_block_unit[type]++); 198 } 199 200 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 201 { 202 DriveInfo *dinfo; 203 204 QTAILQ_FOREACH(dinfo, &drives, next) { 205 if (dinfo->bdrv == bs) { 206 return dinfo; 207 } 208 } 209 return NULL; 210 } 211 212 static void bdrv_format_print(void *opaque, const char *name) 213 { 214 error_printf(" %s", name); 215 } 216 217 static void drive_uninit(DriveInfo *dinfo) 218 { 219 if (dinfo->opts) { 220 qemu_opts_del(dinfo->opts); 221 } 222 223 bdrv_unref(dinfo->bdrv); 224 g_free(dinfo->id); 225 QTAILQ_REMOVE(&drives, dinfo, next); 226 g_free(dinfo->serial); 227 g_free(dinfo); 228 } 229 230 void drive_put_ref(DriveInfo *dinfo) 231 { 232 assert(dinfo->refcount); 233 if (--dinfo->refcount == 0) { 234 drive_uninit(dinfo); 235 } 236 } 237 238 void drive_get_ref(DriveInfo *dinfo) 239 { 240 dinfo->refcount++; 241 } 242 243 typedef struct { 244 QEMUBH *bh; 245 BlockDriverState *bs; 246 } BDRVPutRefBH; 247 248 static void bdrv_put_ref_bh(void *opaque) 249 { 250 BDRVPutRefBH *s = opaque; 251 252 bdrv_unref(s->bs); 253 qemu_bh_delete(s->bh); 254 g_free(s); 255 } 256 257 /* 258 * Release a BDS reference in a BH 259 * 260 * It is not safe to use bdrv_unref() from a callback function when the callers 261 * still need the BlockDriverState. In such cases we schedule a BH to release 262 * the reference. 263 */ 264 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 265 { 266 BDRVPutRefBH *s; 267 268 s = g_new(BDRVPutRefBH, 1); 269 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 270 s->bs = bs; 271 qemu_bh_schedule(s->bh); 272 } 273 274 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 275 { 276 if (!strcmp(buf, "ignore")) { 277 return BLOCKDEV_ON_ERROR_IGNORE; 278 } else if (!is_read && !strcmp(buf, "enospc")) { 279 return BLOCKDEV_ON_ERROR_ENOSPC; 280 } else if (!strcmp(buf, "stop")) { 281 return BLOCKDEV_ON_ERROR_STOP; 282 } else if (!strcmp(buf, "report")) { 283 return BLOCKDEV_ON_ERROR_REPORT; 284 } else { 285 error_setg(errp, "'%s' invalid %s error action", 286 buf, is_read ? "read" : "write"); 287 return -1; 288 } 289 } 290 291 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 292 { 293 if (throttle_conflicting(cfg)) { 294 error_setg(errp, "bps/iops/max total values and read/write values" 295 " cannot be used at the same time"); 296 return false; 297 } 298 299 if (!throttle_is_valid(cfg)) { 300 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 301 return false; 302 } 303 304 return true; 305 } 306 307 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 308 309 /* Takes the ownership of bs_opts */ 310 static DriveInfo *blockdev_init(const char *file, QDict *bs_opts, 311 BlockInterfaceType type, 312 Error **errp) 313 { 314 const char *buf; 315 const char *serial; 316 int ro = 0; 317 int bdrv_flags = 0; 318 int on_read_error, on_write_error; 319 DriveInfo *dinfo; 320 ThrottleConfig cfg; 321 int snapshot = 0; 322 bool copy_on_read; 323 int ret; 324 Error *error = NULL; 325 QemuOpts *opts; 326 const char *id; 327 bool has_driver_specific_opts; 328 BlockDriver *drv = NULL; 329 330 /* Check common options by copying from bs_opts to opts, all other options 331 * stay in bs_opts for processing by bdrv_open(). */ 332 id = qdict_get_try_str(bs_opts, "id"); 333 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 334 if (error_is_set(&error)) { 335 error_propagate(errp, error); 336 return NULL; 337 } 338 339 qemu_opts_absorb_qdict(opts, bs_opts, &error); 340 if (error_is_set(&error)) { 341 error_propagate(errp, error); 342 goto early_err; 343 } 344 345 if (id) { 346 qdict_del(bs_opts, "id"); 347 } 348 349 has_driver_specific_opts = !!qdict_size(bs_opts); 350 351 /* extract parameters */ 352 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 353 ro = qemu_opt_get_bool(opts, "read-only", 0); 354 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 355 356 serial = qemu_opt_get(opts, "serial"); 357 358 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 359 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 360 error_setg(errp, "invalid discard option"); 361 goto early_err; 362 } 363 } 364 365 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 366 bdrv_flags |= BDRV_O_CACHE_WB; 367 } 368 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 369 bdrv_flags |= BDRV_O_NOCACHE; 370 } 371 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 372 bdrv_flags |= BDRV_O_NO_FLUSH; 373 } 374 375 #ifdef CONFIG_LINUX_AIO 376 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 377 if (!strcmp(buf, "native")) { 378 bdrv_flags |= BDRV_O_NATIVE_AIO; 379 } else if (!strcmp(buf, "threads")) { 380 /* this is the default */ 381 } else { 382 error_setg(errp, "invalid aio option"); 383 goto early_err; 384 } 385 } 386 #endif 387 388 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 389 if (is_help_option(buf)) { 390 error_printf("Supported formats:"); 391 bdrv_iterate_format(bdrv_format_print, NULL); 392 error_printf("\n"); 393 goto early_err; 394 } 395 396 drv = bdrv_find_format(buf); 397 if (!drv) { 398 error_setg(errp, "'%s' invalid format", buf); 399 goto early_err; 400 } 401 } 402 403 /* disk I/O throttling */ 404 memset(&cfg, 0, sizeof(cfg)); 405 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 406 qemu_opt_get_number(opts, "throttling.bps-total", 0); 407 cfg.buckets[THROTTLE_BPS_READ].avg = 408 qemu_opt_get_number(opts, "throttling.bps-read", 0); 409 cfg.buckets[THROTTLE_BPS_WRITE].avg = 410 qemu_opt_get_number(opts, "throttling.bps-write", 0); 411 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 412 qemu_opt_get_number(opts, "throttling.iops-total", 0); 413 cfg.buckets[THROTTLE_OPS_READ].avg = 414 qemu_opt_get_number(opts, "throttling.iops-read", 0); 415 cfg.buckets[THROTTLE_OPS_WRITE].avg = 416 qemu_opt_get_number(opts, "throttling.iops-write", 0); 417 418 cfg.buckets[THROTTLE_BPS_TOTAL].max = 419 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 420 cfg.buckets[THROTTLE_BPS_READ].max = 421 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 422 cfg.buckets[THROTTLE_BPS_WRITE].max = 423 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 424 cfg.buckets[THROTTLE_OPS_TOTAL].max = 425 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 426 cfg.buckets[THROTTLE_OPS_READ].max = 427 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 428 cfg.buckets[THROTTLE_OPS_WRITE].max = 429 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 430 431 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 432 433 if (!check_throttle_config(&cfg, &error)) { 434 error_propagate(errp, error); 435 goto early_err; 436 } 437 438 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 439 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 440 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) { 441 error_setg(errp, "werror is not supported by this bus type"); 442 goto early_err; 443 } 444 445 on_write_error = parse_block_error_action(buf, 0, &error); 446 if (error_is_set(&error)) { 447 error_propagate(errp, error); 448 goto early_err; 449 } 450 } 451 452 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 453 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 454 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) { 455 error_report("rerror is not supported by this bus type"); 456 goto early_err; 457 } 458 459 on_read_error = parse_block_error_action(buf, 1, &error); 460 if (error_is_set(&error)) { 461 error_propagate(errp, error); 462 goto early_err; 463 } 464 } 465 466 /* init */ 467 dinfo = g_malloc0(sizeof(*dinfo)); 468 dinfo->id = g_strdup(qemu_opts_id(opts)); 469 dinfo->bdrv = bdrv_new(dinfo->id); 470 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 471 dinfo->bdrv->read_only = ro; 472 dinfo->type = type; 473 dinfo->refcount = 1; 474 if (serial != NULL) { 475 dinfo->serial = g_strdup(serial); 476 } 477 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 478 479 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 480 481 /* disk I/O throttling */ 482 if (throttle_enabled(&cfg)) { 483 bdrv_io_limits_enable(dinfo->bdrv); 484 bdrv_set_io_limits(dinfo->bdrv, &cfg); 485 } 486 487 if (!file || !*file) { 488 if (has_driver_specific_opts) { 489 file = NULL; 490 } else { 491 QDECREF(bs_opts); 492 qemu_opts_del(opts); 493 return dinfo; 494 } 495 } 496 if (snapshot) { 497 /* always use cache=unsafe with snapshot */ 498 bdrv_flags &= ~BDRV_O_CACHE_MASK; 499 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 500 } 501 502 if (copy_on_read) { 503 bdrv_flags |= BDRV_O_COPY_ON_READ; 504 } 505 506 if (runstate_check(RUN_STATE_INMIGRATE)) { 507 bdrv_flags |= BDRV_O_INCOMING; 508 } 509 510 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 511 512 QINCREF(bs_opts); 513 ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error); 514 515 if (ret < 0) { 516 error_setg(errp, "could not open disk image %s: %s", 517 file ?: dinfo->id, error_get_pretty(error)); 518 error_free(error); 519 goto err; 520 } 521 522 if (bdrv_key_required(dinfo->bdrv)) 523 autostart = 0; 524 525 QDECREF(bs_opts); 526 qemu_opts_del(opts); 527 528 return dinfo; 529 530 err: 531 bdrv_unref(dinfo->bdrv); 532 g_free(dinfo->id); 533 QTAILQ_REMOVE(&drives, dinfo, next); 534 g_free(dinfo); 535 early_err: 536 QDECREF(bs_opts); 537 qemu_opts_del(opts); 538 return NULL; 539 } 540 541 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to) 542 { 543 const char *value; 544 545 value = qemu_opt_get(opts, from); 546 if (value) { 547 qemu_opt_set(opts, to, value); 548 qemu_opt_unset(opts, from); 549 } 550 } 551 552 QemuOptsList qemu_legacy_drive_opts = { 553 .name = "drive", 554 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 555 .desc = { 556 { 557 .name = "bus", 558 .type = QEMU_OPT_NUMBER, 559 .help = "bus number", 560 },{ 561 .name = "unit", 562 .type = QEMU_OPT_NUMBER, 563 .help = "unit number (i.e. lun for scsi)", 564 },{ 565 .name = "index", 566 .type = QEMU_OPT_NUMBER, 567 .help = "index number", 568 },{ 569 .name = "media", 570 .type = QEMU_OPT_STRING, 571 .help = "media type (disk, cdrom)", 572 },{ 573 .name = "if", 574 .type = QEMU_OPT_STRING, 575 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 576 },{ 577 .name = "cyls", 578 .type = QEMU_OPT_NUMBER, 579 .help = "number of cylinders (ide disk geometry)", 580 },{ 581 .name = "heads", 582 .type = QEMU_OPT_NUMBER, 583 .help = "number of heads (ide disk geometry)", 584 },{ 585 .name = "secs", 586 .type = QEMU_OPT_NUMBER, 587 .help = "number of sectors (ide disk geometry)", 588 },{ 589 .name = "trans", 590 .type = QEMU_OPT_STRING, 591 .help = "chs translation (auto, lba, none)", 592 },{ 593 .name = "boot", 594 .type = QEMU_OPT_BOOL, 595 .help = "(deprecated, ignored)", 596 },{ 597 .name = "addr", 598 .type = QEMU_OPT_STRING, 599 .help = "pci address (virtio only)", 600 },{ 601 .name = "file", 602 .type = QEMU_OPT_STRING, 603 .help = "file name", 604 }, 605 606 /* Options that are passed on, but have special semantics with -drive */ 607 { 608 .name = "read-only", 609 .type = QEMU_OPT_BOOL, 610 .help = "open drive file as read-only", 611 },{ 612 .name = "copy-on-read", 613 .type = QEMU_OPT_BOOL, 614 .help = "copy read data from backing file into image file", 615 }, 616 617 { /* end of list */ } 618 }, 619 }; 620 621 DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type) 622 { 623 const char *value; 624 DriveInfo *dinfo = NULL; 625 QDict *bs_opts; 626 QemuOpts *legacy_opts; 627 DriveMediaType media = MEDIA_DISK; 628 BlockInterfaceType type; 629 int cyls, heads, secs, translation; 630 int max_devs, bus_id, unit_id, index; 631 const char *devaddr; 632 bool read_only = false; 633 bool copy_on_read; 634 const char *filename; 635 Error *local_err = NULL; 636 637 /* Change legacy command line options into QMP ones */ 638 qemu_opt_rename(all_opts, "iops", "throttling.iops-total"); 639 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read"); 640 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write"); 641 642 qemu_opt_rename(all_opts, "bps", "throttling.bps-total"); 643 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read"); 644 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write"); 645 646 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max"); 647 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max"); 648 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max"); 649 650 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max"); 651 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max"); 652 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max"); 653 654 qemu_opt_rename(all_opts, 655 "iops_size", "throttling.iops-size"); 656 657 qemu_opt_rename(all_opts, "readonly", "read-only"); 658 659 value = qemu_opt_get(all_opts, "cache"); 660 if (value) { 661 int flags = 0; 662 663 if (bdrv_parse_cache_flags(value, &flags) != 0) { 664 error_report("invalid cache option"); 665 return NULL; 666 } 667 668 /* Specific options take precedence */ 669 if (!qemu_opt_get(all_opts, "cache.writeback")) { 670 qemu_opt_set_bool(all_opts, "cache.writeback", 671 !!(flags & BDRV_O_CACHE_WB)); 672 } 673 if (!qemu_opt_get(all_opts, "cache.direct")) { 674 qemu_opt_set_bool(all_opts, "cache.direct", 675 !!(flags & BDRV_O_NOCACHE)); 676 } 677 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 678 qemu_opt_set_bool(all_opts, "cache.no-flush", 679 !!(flags & BDRV_O_NO_FLUSH)); 680 } 681 qemu_opt_unset(all_opts, "cache"); 682 } 683 684 /* Get a QDict for processing the options */ 685 bs_opts = qdict_new(); 686 qemu_opts_to_qdict(all_opts, bs_opts); 687 688 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 689 &error_abort); 690 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 691 if (error_is_set(&local_err)) { 692 qerror_report_err(local_err); 693 error_free(local_err); 694 goto fail; 695 } 696 697 /* Deprecated option boot=[on|off] */ 698 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 699 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 700 "ignored. Future versions will reject this parameter. Please " 701 "update your scripts.\n"); 702 } 703 704 /* Media type */ 705 value = qemu_opt_get(legacy_opts, "media"); 706 if (value) { 707 if (!strcmp(value, "disk")) { 708 media = MEDIA_DISK; 709 } else if (!strcmp(value, "cdrom")) { 710 media = MEDIA_CDROM; 711 read_only = true; 712 } else { 713 error_report("'%s' invalid media", value); 714 goto fail; 715 } 716 } 717 718 /* copy-on-read is disabled with a warning for read-only devices */ 719 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 720 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 721 722 if (read_only && copy_on_read) { 723 error_report("warning: disabling copy-on-read on read-only drive"); 724 copy_on_read = false; 725 } 726 727 qdict_put(bs_opts, "read-only", 728 qstring_from_str(read_only ? "on" : "off")); 729 qdict_put(bs_opts, "copy-on-read", 730 qstring_from_str(copy_on_read ? "on" :"off")); 731 732 /* Controller type */ 733 value = qemu_opt_get(legacy_opts, "if"); 734 if (value) { 735 for (type = 0; 736 type < IF_COUNT && strcmp(value, if_name[type]); 737 type++) { 738 } 739 if (type == IF_COUNT) { 740 error_report("unsupported bus type '%s'", value); 741 goto fail; 742 } 743 } else { 744 type = block_default_type; 745 } 746 747 /* Geometry */ 748 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 749 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 750 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 751 752 if (cyls || heads || secs) { 753 if (cyls < 1) { 754 error_report("invalid physical cyls number"); 755 goto fail; 756 } 757 if (heads < 1) { 758 error_report("invalid physical heads number"); 759 goto fail; 760 } 761 if (secs < 1) { 762 error_report("invalid physical secs number"); 763 goto fail; 764 } 765 } 766 767 translation = BIOS_ATA_TRANSLATION_AUTO; 768 value = qemu_opt_get(legacy_opts, "trans"); 769 if (value != NULL) { 770 if (!cyls) { 771 error_report("'%s' trans must be used with cyls, heads and secs", 772 value); 773 goto fail; 774 } 775 if (!strcmp(value, "none")) { 776 translation = BIOS_ATA_TRANSLATION_NONE; 777 } else if (!strcmp(value, "lba")) { 778 translation = BIOS_ATA_TRANSLATION_LBA; 779 } else if (!strcmp(value, "auto")) { 780 translation = BIOS_ATA_TRANSLATION_AUTO; 781 } else { 782 error_report("'%s' invalid translation type", value); 783 goto fail; 784 } 785 } 786 787 if (media == MEDIA_CDROM) { 788 if (cyls || secs || heads) { 789 error_report("CHS can't be set with media=cdrom"); 790 goto fail; 791 } 792 } 793 794 /* Device address specified by bus/unit or index. 795 * If none was specified, try to find the first free one. */ 796 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 797 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 798 index = qemu_opt_get_number(legacy_opts, "index", -1); 799 800 max_devs = if_max_devs[type]; 801 802 if (index != -1) { 803 if (bus_id != 0 || unit_id != -1) { 804 error_report("index cannot be used with bus and unit"); 805 goto fail; 806 } 807 bus_id = drive_index_to_bus_id(type, index); 808 unit_id = drive_index_to_unit_id(type, index); 809 } 810 811 if (unit_id == -1) { 812 unit_id = 0; 813 while (drive_get(type, bus_id, unit_id) != NULL) { 814 unit_id++; 815 if (max_devs && unit_id >= max_devs) { 816 unit_id -= max_devs; 817 bus_id++; 818 } 819 } 820 } 821 822 if (max_devs && unit_id >= max_devs) { 823 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 824 goto fail; 825 } 826 827 if (drive_get(type, bus_id, unit_id) != NULL) { 828 error_report("drive with bus=%d, unit=%d (index=%d) exists", 829 bus_id, unit_id, index); 830 goto fail; 831 } 832 833 /* no id supplied -> create one */ 834 if (qemu_opts_id(all_opts) == NULL) { 835 char *new_id; 836 const char *mediastr = ""; 837 if (type == IF_IDE || type == IF_SCSI) { 838 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 839 } 840 if (max_devs) { 841 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 842 mediastr, unit_id); 843 } else { 844 new_id = g_strdup_printf("%s%s%i", if_name[type], 845 mediastr, unit_id); 846 } 847 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 848 g_free(new_id); 849 } 850 851 /* Add virtio block device */ 852 devaddr = qemu_opt_get(legacy_opts, "addr"); 853 if (devaddr && type != IF_VIRTIO) { 854 error_report("addr is not supported by this bus type"); 855 goto fail; 856 } 857 858 if (type == IF_VIRTIO) { 859 QemuOpts *devopts; 860 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 861 &error_abort); 862 if (arch_type == QEMU_ARCH_S390X) { 863 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 864 } else { 865 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 866 } 867 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 868 if (devaddr) { 869 qemu_opt_set(devopts, "addr", devaddr); 870 } 871 } 872 873 filename = qemu_opt_get(legacy_opts, "file"); 874 875 /* Actual block device init: Functionality shared with blockdev-add */ 876 dinfo = blockdev_init(filename, bs_opts, type, &local_err); 877 if (dinfo == NULL) { 878 if (error_is_set(&local_err)) { 879 qerror_report_err(local_err); 880 error_free(local_err); 881 } 882 goto fail; 883 } else { 884 assert(!error_is_set(&local_err)); 885 } 886 887 /* Set legacy DriveInfo fields */ 888 dinfo->enable_auto_del = true; 889 dinfo->opts = all_opts; 890 891 dinfo->cyls = cyls; 892 dinfo->heads = heads; 893 dinfo->secs = secs; 894 dinfo->trans = translation; 895 896 dinfo->bus = bus_id; 897 dinfo->unit = unit_id; 898 dinfo->devaddr = devaddr; 899 900 switch(type) { 901 case IF_IDE: 902 case IF_SCSI: 903 case IF_XEN: 904 case IF_NONE: 905 dinfo->media_cd = media == MEDIA_CDROM; 906 break; 907 default: 908 break; 909 } 910 911 fail: 912 qemu_opts_del(legacy_opts); 913 return dinfo; 914 } 915 916 void do_commit(Monitor *mon, const QDict *qdict) 917 { 918 const char *device = qdict_get_str(qdict, "device"); 919 BlockDriverState *bs; 920 int ret; 921 922 if (!strcmp(device, "all")) { 923 ret = bdrv_commit_all(); 924 } else { 925 bs = bdrv_find(device); 926 if (!bs) { 927 monitor_printf(mon, "Device '%s' not found\n", device); 928 return; 929 } 930 ret = bdrv_commit(bs); 931 } 932 if (ret < 0) { 933 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 934 strerror(-ret)); 935 } 936 } 937 938 static void blockdev_do_action(int kind, void *data, Error **errp) 939 { 940 TransactionAction action; 941 TransactionActionList list; 942 943 action.kind = kind; 944 action.data = data; 945 list.value = &action; 946 list.next = NULL; 947 qmp_transaction(&list, errp); 948 } 949 950 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 951 bool has_node_name, const char *node_name, 952 const char *snapshot_file, 953 bool has_snapshot_node_name, 954 const char *snapshot_node_name, 955 bool has_format, const char *format, 956 bool has_mode, NewImageMode mode, Error **errp) 957 { 958 BlockdevSnapshot snapshot = { 959 .has_device = has_device, 960 .device = (char *) device, 961 .has_node_name = has_node_name, 962 .node_name = (char *) node_name, 963 .snapshot_file = (char *) snapshot_file, 964 .has_snapshot_node_name = has_snapshot_node_name, 965 .snapshot_node_name = (char *) snapshot_node_name, 966 .has_format = has_format, 967 .format = (char *) format, 968 .has_mode = has_mode, 969 .mode = mode, 970 }; 971 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 972 &snapshot, errp); 973 } 974 975 void qmp_blockdev_snapshot_internal_sync(const char *device, 976 const char *name, 977 Error **errp) 978 { 979 BlockdevSnapshotInternal snapshot = { 980 .device = (char *) device, 981 .name = (char *) name 982 }; 983 984 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 985 &snapshot, errp); 986 } 987 988 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 989 bool has_id, 990 const char *id, 991 bool has_name, 992 const char *name, 993 Error **errp) 994 { 995 BlockDriverState *bs = bdrv_find(device); 996 QEMUSnapshotInfo sn; 997 Error *local_err = NULL; 998 SnapshotInfo *info = NULL; 999 int ret; 1000 1001 if (!bs) { 1002 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1003 return NULL; 1004 } 1005 1006 if (!has_id) { 1007 id = NULL; 1008 } 1009 1010 if (!has_name) { 1011 name = NULL; 1012 } 1013 1014 if (!id && !name) { 1015 error_setg(errp, "Name or id must be provided"); 1016 return NULL; 1017 } 1018 1019 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1020 if (error_is_set(&local_err)) { 1021 error_propagate(errp, local_err); 1022 return NULL; 1023 } 1024 if (!ret) { 1025 error_setg(errp, 1026 "Snapshot with id '%s' and name '%s' does not exist on " 1027 "device '%s'", 1028 STR_OR_NULL(id), STR_OR_NULL(name), device); 1029 return NULL; 1030 } 1031 1032 bdrv_snapshot_delete(bs, id, name, &local_err); 1033 if (error_is_set(&local_err)) { 1034 error_propagate(errp, local_err); 1035 return NULL; 1036 } 1037 1038 info = g_malloc0(sizeof(SnapshotInfo)); 1039 info->id = g_strdup(sn.id_str); 1040 info->name = g_strdup(sn.name); 1041 info->date_nsec = sn.date_nsec; 1042 info->date_sec = sn.date_sec; 1043 info->vm_state_size = sn.vm_state_size; 1044 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1045 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1046 1047 return info; 1048 } 1049 1050 /* New and old BlockDriverState structs for group snapshots */ 1051 1052 typedef struct BlkTransactionState BlkTransactionState; 1053 1054 /* Only prepare() may fail. In a single transaction, only one of commit() or 1055 abort() will be called, clean() will always be called if it present. */ 1056 typedef struct BdrvActionOps { 1057 /* Size of state struct, in bytes. */ 1058 size_t instance_size; 1059 /* Prepare the work, must NOT be NULL. */ 1060 void (*prepare)(BlkTransactionState *common, Error **errp); 1061 /* Commit the changes, can be NULL. */ 1062 void (*commit)(BlkTransactionState *common); 1063 /* Abort the changes on fail, can be NULL. */ 1064 void (*abort)(BlkTransactionState *common); 1065 /* Clean up resource in the end, can be NULL. */ 1066 void (*clean)(BlkTransactionState *common); 1067 } BdrvActionOps; 1068 1069 /* 1070 * This structure must be arranged as first member in child type, assuming 1071 * that compiler will also arrange it to the same address with parent instance. 1072 * Later it will be used in free(). 1073 */ 1074 struct BlkTransactionState { 1075 TransactionAction *action; 1076 const BdrvActionOps *ops; 1077 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1078 }; 1079 1080 /* internal snapshot private data */ 1081 typedef struct InternalSnapshotState { 1082 BlkTransactionState common; 1083 BlockDriverState *bs; 1084 QEMUSnapshotInfo sn; 1085 } InternalSnapshotState; 1086 1087 static void internal_snapshot_prepare(BlkTransactionState *common, 1088 Error **errp) 1089 { 1090 const char *device; 1091 const char *name; 1092 BlockDriverState *bs; 1093 QEMUSnapshotInfo old_sn, *sn; 1094 bool ret; 1095 qemu_timeval tv; 1096 BlockdevSnapshotInternal *internal; 1097 InternalSnapshotState *state; 1098 int ret1; 1099 1100 g_assert(common->action->kind == 1101 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1102 internal = common->action->blockdev_snapshot_internal_sync; 1103 state = DO_UPCAST(InternalSnapshotState, common, common); 1104 1105 /* 1. parse input */ 1106 device = internal->device; 1107 name = internal->name; 1108 1109 /* 2. check for validation */ 1110 bs = bdrv_find(device); 1111 if (!bs) { 1112 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1113 return; 1114 } 1115 1116 if (!bdrv_is_inserted(bs)) { 1117 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1118 return; 1119 } 1120 1121 if (bdrv_is_read_only(bs)) { 1122 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1123 return; 1124 } 1125 1126 if (!bdrv_can_snapshot(bs)) { 1127 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1128 bs->drv->format_name, device, "internal snapshot"); 1129 return; 1130 } 1131 1132 if (!strlen(name)) { 1133 error_setg(errp, "Name is empty"); 1134 return; 1135 } 1136 1137 /* check whether a snapshot with name exist */ 1138 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, errp); 1139 if (error_is_set(errp)) { 1140 return; 1141 } else if (ret) { 1142 error_setg(errp, 1143 "Snapshot with name '%s' already exists on device '%s'", 1144 name, device); 1145 return; 1146 } 1147 1148 /* 3. take the snapshot */ 1149 sn = &state->sn; 1150 pstrcpy(sn->name, sizeof(sn->name), name); 1151 qemu_gettimeofday(&tv); 1152 sn->date_sec = tv.tv_sec; 1153 sn->date_nsec = tv.tv_usec * 1000; 1154 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1155 1156 ret1 = bdrv_snapshot_create(bs, sn); 1157 if (ret1 < 0) { 1158 error_setg_errno(errp, -ret1, 1159 "Failed to create snapshot '%s' on device '%s'", 1160 name, device); 1161 return; 1162 } 1163 1164 /* 4. succeed, mark a snapshot is created */ 1165 state->bs = bs; 1166 } 1167 1168 static void internal_snapshot_abort(BlkTransactionState *common) 1169 { 1170 InternalSnapshotState *state = 1171 DO_UPCAST(InternalSnapshotState, common, common); 1172 BlockDriverState *bs = state->bs; 1173 QEMUSnapshotInfo *sn = &state->sn; 1174 Error *local_error = NULL; 1175 1176 if (!bs) { 1177 return; 1178 } 1179 1180 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1181 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1182 "device '%s' in abort: %s", 1183 sn->id_str, 1184 sn->name, 1185 bdrv_get_device_name(bs), 1186 error_get_pretty(local_error)); 1187 error_free(local_error); 1188 } 1189 } 1190 1191 /* external snapshot private data */ 1192 typedef struct ExternalSnapshotState { 1193 BlkTransactionState common; 1194 BlockDriverState *old_bs; 1195 BlockDriverState *new_bs; 1196 } ExternalSnapshotState; 1197 1198 static void external_snapshot_prepare(BlkTransactionState *common, 1199 Error **errp) 1200 { 1201 BlockDriver *drv; 1202 int flags, ret; 1203 QDict *options = NULL; 1204 Error *local_err = NULL; 1205 bool has_device = false; 1206 const char *device; 1207 bool has_node_name = false; 1208 const char *node_name; 1209 bool has_snapshot_node_name = false; 1210 const char *snapshot_node_name; 1211 const char *new_image_file; 1212 const char *format = "qcow2"; 1213 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1214 ExternalSnapshotState *state = 1215 DO_UPCAST(ExternalSnapshotState, common, common); 1216 TransactionAction *action = common->action; 1217 1218 /* get parameters */ 1219 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1220 1221 has_device = action->blockdev_snapshot_sync->has_device; 1222 device = action->blockdev_snapshot_sync->device; 1223 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1224 node_name = action->blockdev_snapshot_sync->node_name; 1225 has_snapshot_node_name = 1226 action->blockdev_snapshot_sync->has_snapshot_node_name; 1227 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1228 1229 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1230 if (action->blockdev_snapshot_sync->has_format) { 1231 format = action->blockdev_snapshot_sync->format; 1232 } 1233 if (action->blockdev_snapshot_sync->has_mode) { 1234 mode = action->blockdev_snapshot_sync->mode; 1235 } 1236 1237 /* start processing */ 1238 drv = bdrv_find_format(format); 1239 if (!drv) { 1240 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1241 return; 1242 } 1243 1244 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1245 has_node_name ? node_name : NULL, 1246 &local_err); 1247 if (error_is_set(&local_err)) { 1248 error_propagate(errp, local_err); 1249 return; 1250 } 1251 1252 if (has_node_name && !has_snapshot_node_name) { 1253 error_setg(errp, "New snapshot node name missing"); 1254 return; 1255 } 1256 1257 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1258 error_setg(errp, "New snapshot node name already existing"); 1259 return; 1260 } 1261 1262 if (!bdrv_is_inserted(state->old_bs)) { 1263 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1264 return; 1265 } 1266 1267 if (bdrv_in_use(state->old_bs)) { 1268 error_set(errp, QERR_DEVICE_IN_USE, device); 1269 return; 1270 } 1271 1272 if (!bdrv_is_read_only(state->old_bs)) { 1273 if (bdrv_flush(state->old_bs)) { 1274 error_set(errp, QERR_IO_ERROR); 1275 return; 1276 } 1277 } 1278 1279 if (!bdrv_is_first_non_filter(state->old_bs)) { 1280 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1281 return; 1282 } 1283 1284 flags = state->old_bs->open_flags; 1285 1286 /* create new image w/backing file */ 1287 if (mode != NEW_IMAGE_MODE_EXISTING) { 1288 bdrv_img_create(new_image_file, format, 1289 state->old_bs->filename, 1290 state->old_bs->drv->format_name, 1291 NULL, -1, flags, &local_err, false); 1292 if (error_is_set(&local_err)) { 1293 error_propagate(errp, local_err); 1294 return; 1295 } 1296 } 1297 1298 if (has_snapshot_node_name) { 1299 options = qdict_new(); 1300 qdict_put(options, "node-name", 1301 qstring_from_str(snapshot_node_name)); 1302 } 1303 1304 /* We will manually add the backing_hd field to the bs later */ 1305 state->new_bs = bdrv_new(""); 1306 /* TODO Inherit bs->options or only take explicit options with an 1307 * extended QMP command? */ 1308 ret = bdrv_open(state->new_bs, new_image_file, options, 1309 flags | BDRV_O_NO_BACKING, drv, &local_err); 1310 if (ret != 0) { 1311 error_propagate(errp, local_err); 1312 } 1313 1314 QDECREF(options); 1315 } 1316 1317 static void external_snapshot_commit(BlkTransactionState *common) 1318 { 1319 ExternalSnapshotState *state = 1320 DO_UPCAST(ExternalSnapshotState, common, common); 1321 1322 /* This removes our old bs and adds the new bs */ 1323 bdrv_append(state->new_bs, state->old_bs); 1324 /* We don't need (or want) to use the transactional 1325 * bdrv_reopen_multiple() across all the entries at once, because we 1326 * don't want to abort all of them if one of them fails the reopen */ 1327 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1328 NULL); 1329 } 1330 1331 static void external_snapshot_abort(BlkTransactionState *common) 1332 { 1333 ExternalSnapshotState *state = 1334 DO_UPCAST(ExternalSnapshotState, common, common); 1335 if (state->new_bs) { 1336 bdrv_unref(state->new_bs); 1337 } 1338 } 1339 1340 typedef struct DriveBackupState { 1341 BlkTransactionState common; 1342 BlockDriverState *bs; 1343 BlockJob *job; 1344 } DriveBackupState; 1345 1346 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1347 { 1348 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1349 DriveBackup *backup; 1350 Error *local_err = NULL; 1351 1352 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1353 backup = common->action->drive_backup; 1354 1355 qmp_drive_backup(backup->device, backup->target, 1356 backup->has_format, backup->format, 1357 backup->sync, 1358 backup->has_mode, backup->mode, 1359 backup->has_speed, backup->speed, 1360 backup->has_on_source_error, backup->on_source_error, 1361 backup->has_on_target_error, backup->on_target_error, 1362 &local_err); 1363 if (error_is_set(&local_err)) { 1364 error_propagate(errp, local_err); 1365 state->bs = NULL; 1366 state->job = NULL; 1367 return; 1368 } 1369 1370 state->bs = bdrv_find(backup->device); 1371 state->job = state->bs->job; 1372 } 1373 1374 static void drive_backup_abort(BlkTransactionState *common) 1375 { 1376 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1377 BlockDriverState *bs = state->bs; 1378 1379 /* Only cancel if it's the job we started */ 1380 if (bs && bs->job && bs->job == state->job) { 1381 block_job_cancel_sync(bs->job); 1382 } 1383 } 1384 1385 static void abort_prepare(BlkTransactionState *common, Error **errp) 1386 { 1387 error_setg(errp, "Transaction aborted using Abort action"); 1388 } 1389 1390 static void abort_commit(BlkTransactionState *common) 1391 { 1392 g_assert_not_reached(); /* this action never succeeds */ 1393 } 1394 1395 static const BdrvActionOps actions[] = { 1396 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1397 .instance_size = sizeof(ExternalSnapshotState), 1398 .prepare = external_snapshot_prepare, 1399 .commit = external_snapshot_commit, 1400 .abort = external_snapshot_abort, 1401 }, 1402 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1403 .instance_size = sizeof(DriveBackupState), 1404 .prepare = drive_backup_prepare, 1405 .abort = drive_backup_abort, 1406 }, 1407 [TRANSACTION_ACTION_KIND_ABORT] = { 1408 .instance_size = sizeof(BlkTransactionState), 1409 .prepare = abort_prepare, 1410 .commit = abort_commit, 1411 }, 1412 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1413 .instance_size = sizeof(InternalSnapshotState), 1414 .prepare = internal_snapshot_prepare, 1415 .abort = internal_snapshot_abort, 1416 }, 1417 }; 1418 1419 /* 1420 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1421 * then we do not pivot any of the devices in the group, and abandon the 1422 * snapshots 1423 */ 1424 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1425 { 1426 TransactionActionList *dev_entry = dev_list; 1427 BlkTransactionState *state, *next; 1428 Error *local_err = NULL; 1429 1430 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1431 QSIMPLEQ_INIT(&snap_bdrv_states); 1432 1433 /* drain all i/o before any snapshots */ 1434 bdrv_drain_all(); 1435 1436 /* We don't do anything in this loop that commits us to the snapshot */ 1437 while (NULL != dev_entry) { 1438 TransactionAction *dev_info = NULL; 1439 const BdrvActionOps *ops; 1440 1441 dev_info = dev_entry->value; 1442 dev_entry = dev_entry->next; 1443 1444 assert(dev_info->kind < ARRAY_SIZE(actions)); 1445 1446 ops = &actions[dev_info->kind]; 1447 assert(ops->instance_size > 0); 1448 1449 state = g_malloc0(ops->instance_size); 1450 state->ops = ops; 1451 state->action = dev_info; 1452 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1453 1454 state->ops->prepare(state, &local_err); 1455 if (error_is_set(&local_err)) { 1456 error_propagate(errp, local_err); 1457 goto delete_and_fail; 1458 } 1459 } 1460 1461 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1462 if (state->ops->commit) { 1463 state->ops->commit(state); 1464 } 1465 } 1466 1467 /* success */ 1468 goto exit; 1469 1470 delete_and_fail: 1471 /* 1472 * failure, and it is all-or-none; abandon each new bs, and keep using 1473 * the original bs for all images 1474 */ 1475 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1476 if (state->ops->abort) { 1477 state->ops->abort(state); 1478 } 1479 } 1480 exit: 1481 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1482 if (state->ops->clean) { 1483 state->ops->clean(state); 1484 } 1485 g_free(state); 1486 } 1487 } 1488 1489 1490 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1491 { 1492 if (bdrv_in_use(bs)) { 1493 error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); 1494 return; 1495 } 1496 if (!bdrv_dev_has_removable_media(bs)) { 1497 error_set(errp, QERR_DEVICE_NOT_REMOVABLE, bdrv_get_device_name(bs)); 1498 return; 1499 } 1500 1501 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1502 bdrv_dev_eject_request(bs, force); 1503 if (!force) { 1504 error_set(errp, QERR_DEVICE_LOCKED, bdrv_get_device_name(bs)); 1505 return; 1506 } 1507 } 1508 1509 bdrv_close(bs); 1510 } 1511 1512 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1513 { 1514 BlockDriverState *bs; 1515 1516 bs = bdrv_find(device); 1517 if (!bs) { 1518 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1519 return; 1520 } 1521 1522 eject_device(bs, force, errp); 1523 } 1524 1525 void qmp_block_passwd(bool has_device, const char *device, 1526 bool has_node_name, const char *node_name, 1527 const char *password, Error **errp) 1528 { 1529 Error *local_err = NULL; 1530 BlockDriverState *bs; 1531 int err; 1532 1533 bs = bdrv_lookup_bs(has_device ? device : NULL, 1534 has_node_name ? node_name : NULL, 1535 &local_err); 1536 if (error_is_set(&local_err)) { 1537 error_propagate(errp, local_err); 1538 return; 1539 } 1540 1541 err = bdrv_set_key(bs, password); 1542 if (err == -EINVAL) { 1543 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1544 return; 1545 } else if (err < 0) { 1546 error_set(errp, QERR_INVALID_PASSWORD); 1547 return; 1548 } 1549 } 1550 1551 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1552 int bdrv_flags, BlockDriver *drv, 1553 const char *password, Error **errp) 1554 { 1555 Error *local_err = NULL; 1556 int ret; 1557 1558 ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err); 1559 if (ret < 0) { 1560 error_propagate(errp, local_err); 1561 return; 1562 } 1563 1564 if (bdrv_key_required(bs)) { 1565 if (password) { 1566 if (bdrv_set_key(bs, password) < 0) { 1567 error_set(errp, QERR_INVALID_PASSWORD); 1568 } 1569 } else { 1570 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1571 bdrv_get_encrypted_filename(bs)); 1572 } 1573 } else if (password) { 1574 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1575 } 1576 } 1577 1578 void qmp_change_blockdev(const char *device, const char *filename, 1579 const char *format, Error **errp) 1580 { 1581 BlockDriverState *bs; 1582 BlockDriver *drv = NULL; 1583 int bdrv_flags; 1584 Error *err = NULL; 1585 1586 bs = bdrv_find(device); 1587 if (!bs) { 1588 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1589 return; 1590 } 1591 1592 if (format) { 1593 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1594 if (!drv) { 1595 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1596 return; 1597 } 1598 } 1599 1600 eject_device(bs, 0, &err); 1601 if (error_is_set(&err)) { 1602 error_propagate(errp, err); 1603 return; 1604 } 1605 1606 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1607 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1608 1609 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1610 } 1611 1612 /* throttling disk I/O limits */ 1613 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1614 int64_t bps_wr, 1615 int64_t iops, 1616 int64_t iops_rd, 1617 int64_t iops_wr, 1618 bool has_bps_max, 1619 int64_t bps_max, 1620 bool has_bps_rd_max, 1621 int64_t bps_rd_max, 1622 bool has_bps_wr_max, 1623 int64_t bps_wr_max, 1624 bool has_iops_max, 1625 int64_t iops_max, 1626 bool has_iops_rd_max, 1627 int64_t iops_rd_max, 1628 bool has_iops_wr_max, 1629 int64_t iops_wr_max, 1630 bool has_iops_size, 1631 int64_t iops_size, Error **errp) 1632 { 1633 ThrottleConfig cfg; 1634 BlockDriverState *bs; 1635 1636 bs = bdrv_find(device); 1637 if (!bs) { 1638 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1639 return; 1640 } 1641 1642 memset(&cfg, 0, sizeof(cfg)); 1643 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1644 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1645 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1646 1647 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1648 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1649 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1650 1651 if (has_bps_max) { 1652 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1653 } 1654 if (has_bps_rd_max) { 1655 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1656 } 1657 if (has_bps_wr_max) { 1658 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1659 } 1660 if (has_iops_max) { 1661 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1662 } 1663 if (has_iops_rd_max) { 1664 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1665 } 1666 if (has_iops_wr_max) { 1667 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1668 } 1669 1670 if (has_iops_size) { 1671 cfg.op_size = iops_size; 1672 } 1673 1674 if (!check_throttle_config(&cfg, errp)) { 1675 return; 1676 } 1677 1678 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1679 bdrv_io_limits_enable(bs); 1680 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1681 bdrv_io_limits_disable(bs); 1682 } 1683 1684 if (bs->io_limits_enabled) { 1685 bdrv_set_io_limits(bs, &cfg); 1686 } 1687 } 1688 1689 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1690 { 1691 const char *id = qdict_get_str(qdict, "id"); 1692 BlockDriverState *bs; 1693 1694 bs = bdrv_find(id); 1695 if (!bs) { 1696 qerror_report(QERR_DEVICE_NOT_FOUND, id); 1697 return -1; 1698 } 1699 if (bdrv_in_use(bs)) { 1700 qerror_report(QERR_DEVICE_IN_USE, id); 1701 return -1; 1702 } 1703 1704 /* quiesce block driver; prevent further io */ 1705 bdrv_drain_all(); 1706 bdrv_flush(bs); 1707 bdrv_close(bs); 1708 1709 /* if we have a device attached to this BlockDriverState 1710 * then we need to make the drive anonymous until the device 1711 * can be removed. If this is a drive with no device backing 1712 * then we can just get rid of the block driver state right here. 1713 */ 1714 if (bdrv_get_attached_dev(bs)) { 1715 bdrv_make_anon(bs); 1716 1717 /* Further I/O must not pause the guest */ 1718 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1719 BLOCKDEV_ON_ERROR_REPORT); 1720 } else { 1721 drive_uninit(drive_get_by_blockdev(bs)); 1722 } 1723 1724 return 0; 1725 } 1726 1727 void qmp_block_resize(bool has_device, const char *device, 1728 bool has_node_name, const char *node_name, 1729 int64_t size, Error **errp) 1730 { 1731 Error *local_err = NULL; 1732 BlockDriverState *bs; 1733 int ret; 1734 1735 bs = bdrv_lookup_bs(has_device ? device : NULL, 1736 has_node_name ? node_name : NULL, 1737 &local_err); 1738 if (error_is_set(&local_err)) { 1739 error_propagate(errp, local_err); 1740 return; 1741 } 1742 1743 if (!bdrv_is_first_non_filter(bs)) { 1744 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 1745 return; 1746 } 1747 1748 if (size < 0) { 1749 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1750 return; 1751 } 1752 1753 /* complete all in-flight operations before resizing the device */ 1754 bdrv_drain_all(); 1755 1756 ret = bdrv_truncate(bs, size); 1757 switch (ret) { 1758 case 0: 1759 break; 1760 case -ENOMEDIUM: 1761 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1762 break; 1763 case -ENOTSUP: 1764 error_set(errp, QERR_UNSUPPORTED); 1765 break; 1766 case -EACCES: 1767 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1768 break; 1769 case -EBUSY: 1770 error_set(errp, QERR_DEVICE_IN_USE, device); 1771 break; 1772 default: 1773 error_setg_errno(errp, -ret, "Could not resize"); 1774 break; 1775 } 1776 } 1777 1778 static void block_job_cb(void *opaque, int ret) 1779 { 1780 BlockDriverState *bs = opaque; 1781 QObject *obj; 1782 1783 trace_block_job_cb(bs, bs->job, ret); 1784 1785 assert(bs->job); 1786 obj = qobject_from_block_job(bs->job); 1787 if (ret < 0) { 1788 QDict *dict = qobject_to_qdict(obj); 1789 qdict_put(dict, "error", qstring_from_str(strerror(-ret))); 1790 } 1791 1792 if (block_job_is_cancelled(bs->job)) { 1793 monitor_protocol_event(QEVENT_BLOCK_JOB_CANCELLED, obj); 1794 } else { 1795 monitor_protocol_event(QEVENT_BLOCK_JOB_COMPLETED, obj); 1796 } 1797 qobject_decref(obj); 1798 1799 bdrv_put_ref_bh_schedule(bs); 1800 } 1801 1802 void qmp_block_stream(const char *device, bool has_base, 1803 const char *base, bool has_speed, int64_t speed, 1804 bool has_on_error, BlockdevOnError on_error, 1805 Error **errp) 1806 { 1807 BlockDriverState *bs; 1808 BlockDriverState *base_bs = NULL; 1809 Error *local_err = NULL; 1810 1811 if (!has_on_error) { 1812 on_error = BLOCKDEV_ON_ERROR_REPORT; 1813 } 1814 1815 bs = bdrv_find(device); 1816 if (!bs) { 1817 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1818 return; 1819 } 1820 1821 if (base) { 1822 base_bs = bdrv_find_backing_image(bs, base); 1823 if (base_bs == NULL) { 1824 error_set(errp, QERR_BASE_NOT_FOUND, base); 1825 return; 1826 } 1827 } 1828 1829 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1830 on_error, block_job_cb, bs, &local_err); 1831 if (error_is_set(&local_err)) { 1832 error_propagate(errp, local_err); 1833 return; 1834 } 1835 1836 trace_qmp_block_stream(bs, bs->job); 1837 } 1838 1839 void qmp_block_commit(const char *device, 1840 bool has_base, const char *base, const char *top, 1841 bool has_speed, int64_t speed, 1842 Error **errp) 1843 { 1844 BlockDriverState *bs; 1845 BlockDriverState *base_bs, *top_bs; 1846 Error *local_err = NULL; 1847 /* This will be part of the QMP command, if/when the 1848 * BlockdevOnError change for blkmirror makes it in 1849 */ 1850 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1851 1852 /* drain all i/o before commits */ 1853 bdrv_drain_all(); 1854 1855 bs = bdrv_find(device); 1856 if (!bs) { 1857 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1858 return; 1859 } 1860 1861 /* default top_bs is the active layer */ 1862 top_bs = bs; 1863 1864 if (top) { 1865 if (strcmp(bs->filename, top) != 0) { 1866 top_bs = bdrv_find_backing_image(bs, top); 1867 } 1868 } 1869 1870 if (top_bs == NULL) { 1871 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1872 return; 1873 } 1874 1875 if (has_base && base) { 1876 base_bs = bdrv_find_backing_image(top_bs, base); 1877 } else { 1878 base_bs = bdrv_find_base(top_bs); 1879 } 1880 1881 if (base_bs == NULL) { 1882 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1883 return; 1884 } 1885 1886 if (top_bs == bs) { 1887 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 1888 bs, &local_err); 1889 } else { 1890 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1891 &local_err); 1892 } 1893 if (local_err != NULL) { 1894 error_propagate(errp, local_err); 1895 return; 1896 } 1897 } 1898 1899 void qmp_drive_backup(const char *device, const char *target, 1900 bool has_format, const char *format, 1901 enum MirrorSyncMode sync, 1902 bool has_mode, enum NewImageMode mode, 1903 bool has_speed, int64_t speed, 1904 bool has_on_source_error, BlockdevOnError on_source_error, 1905 bool has_on_target_error, BlockdevOnError on_target_error, 1906 Error **errp) 1907 { 1908 BlockDriverState *bs; 1909 BlockDriverState *target_bs; 1910 BlockDriverState *source = NULL; 1911 BlockDriver *drv = NULL; 1912 Error *local_err = NULL; 1913 int flags; 1914 int64_t size; 1915 int ret; 1916 1917 if (!has_speed) { 1918 speed = 0; 1919 } 1920 if (!has_on_source_error) { 1921 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 1922 } 1923 if (!has_on_target_error) { 1924 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 1925 } 1926 if (!has_mode) { 1927 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1928 } 1929 1930 bs = bdrv_find(device); 1931 if (!bs) { 1932 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1933 return; 1934 } 1935 1936 if (!bdrv_is_inserted(bs)) { 1937 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1938 return; 1939 } 1940 1941 if (!has_format) { 1942 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 1943 } 1944 if (format) { 1945 drv = bdrv_find_format(format); 1946 if (!drv) { 1947 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1948 return; 1949 } 1950 } 1951 1952 if (bdrv_in_use(bs)) { 1953 error_set(errp, QERR_DEVICE_IN_USE, device); 1954 return; 1955 } 1956 1957 flags = bs->open_flags | BDRV_O_RDWR; 1958 1959 /* See if we have a backing HD we can use to create our new image 1960 * on top of. */ 1961 if (sync == MIRROR_SYNC_MODE_TOP) { 1962 source = bs->backing_hd; 1963 if (!source) { 1964 sync = MIRROR_SYNC_MODE_FULL; 1965 } 1966 } 1967 if (sync == MIRROR_SYNC_MODE_NONE) { 1968 source = bs; 1969 } 1970 1971 size = bdrv_getlength(bs); 1972 if (size < 0) { 1973 error_setg_errno(errp, -size, "bdrv_getlength failed"); 1974 return; 1975 } 1976 1977 if (mode != NEW_IMAGE_MODE_EXISTING) { 1978 assert(format && drv); 1979 if (source) { 1980 bdrv_img_create(target, format, source->filename, 1981 source->drv->format_name, NULL, 1982 size, flags, &local_err, false); 1983 } else { 1984 bdrv_img_create(target, format, NULL, NULL, NULL, 1985 size, flags, &local_err, false); 1986 } 1987 } 1988 1989 if (error_is_set(&local_err)) { 1990 error_propagate(errp, local_err); 1991 return; 1992 } 1993 1994 target_bs = bdrv_new(""); 1995 ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err); 1996 if (ret < 0) { 1997 bdrv_unref(target_bs); 1998 error_propagate(errp, local_err); 1999 return; 2000 } 2001 2002 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2003 block_job_cb, bs, &local_err); 2004 if (local_err != NULL) { 2005 bdrv_unref(target_bs); 2006 error_propagate(errp, local_err); 2007 return; 2008 } 2009 } 2010 2011 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2012 { 2013 return bdrv_named_nodes_list(); 2014 } 2015 2016 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2017 2018 void qmp_drive_mirror(const char *device, const char *target, 2019 bool has_format, const char *format, 2020 enum MirrorSyncMode sync, 2021 bool has_mode, enum NewImageMode mode, 2022 bool has_speed, int64_t speed, 2023 bool has_granularity, uint32_t granularity, 2024 bool has_buf_size, int64_t buf_size, 2025 bool has_on_source_error, BlockdevOnError on_source_error, 2026 bool has_on_target_error, BlockdevOnError on_target_error, 2027 Error **errp) 2028 { 2029 BlockDriverState *bs; 2030 BlockDriverState *source, *target_bs; 2031 BlockDriver *drv = NULL; 2032 Error *local_err = NULL; 2033 int flags; 2034 int64_t size; 2035 int ret; 2036 2037 if (!has_speed) { 2038 speed = 0; 2039 } 2040 if (!has_on_source_error) { 2041 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2042 } 2043 if (!has_on_target_error) { 2044 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2045 } 2046 if (!has_mode) { 2047 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2048 } 2049 if (!has_granularity) { 2050 granularity = 0; 2051 } 2052 if (!has_buf_size) { 2053 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2054 } 2055 2056 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2057 error_set(errp, QERR_INVALID_PARAMETER, device); 2058 return; 2059 } 2060 if (granularity & (granularity - 1)) { 2061 error_set(errp, QERR_INVALID_PARAMETER, device); 2062 return; 2063 } 2064 2065 bs = bdrv_find(device); 2066 if (!bs) { 2067 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2068 return; 2069 } 2070 2071 if (!bdrv_is_inserted(bs)) { 2072 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2073 return; 2074 } 2075 2076 if (!has_format) { 2077 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2078 } 2079 if (format) { 2080 drv = bdrv_find_format(format); 2081 if (!drv) { 2082 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2083 return; 2084 } 2085 } 2086 2087 if (bdrv_in_use(bs)) { 2088 error_set(errp, QERR_DEVICE_IN_USE, device); 2089 return; 2090 } 2091 2092 flags = bs->open_flags | BDRV_O_RDWR; 2093 source = bs->backing_hd; 2094 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2095 sync = MIRROR_SYNC_MODE_FULL; 2096 } 2097 if (sync == MIRROR_SYNC_MODE_NONE) { 2098 source = bs; 2099 } 2100 2101 size = bdrv_getlength(bs); 2102 if (size < 0) { 2103 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2104 return; 2105 } 2106 2107 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2108 && mode != NEW_IMAGE_MODE_EXISTING) 2109 { 2110 /* create new image w/o backing file */ 2111 assert(format && drv); 2112 bdrv_img_create(target, format, 2113 NULL, NULL, NULL, size, flags, &local_err, false); 2114 } else { 2115 switch (mode) { 2116 case NEW_IMAGE_MODE_EXISTING: 2117 break; 2118 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2119 /* create new image with backing file */ 2120 bdrv_img_create(target, format, 2121 source->filename, 2122 source->drv->format_name, 2123 NULL, size, flags, &local_err, false); 2124 break; 2125 default: 2126 abort(); 2127 } 2128 } 2129 2130 if (error_is_set(&local_err)) { 2131 error_propagate(errp, local_err); 2132 return; 2133 } 2134 2135 /* Mirroring takes care of copy-on-write using the source's backing 2136 * file. 2137 */ 2138 target_bs = bdrv_new(""); 2139 ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv, 2140 &local_err); 2141 if (ret < 0) { 2142 bdrv_unref(target_bs); 2143 error_propagate(errp, local_err); 2144 return; 2145 } 2146 2147 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 2148 on_source_error, on_target_error, 2149 block_job_cb, bs, &local_err); 2150 if (local_err != NULL) { 2151 bdrv_unref(target_bs); 2152 error_propagate(errp, local_err); 2153 return; 2154 } 2155 } 2156 2157 static BlockJob *find_block_job(const char *device) 2158 { 2159 BlockDriverState *bs; 2160 2161 bs = bdrv_find(device); 2162 if (!bs || !bs->job) { 2163 return NULL; 2164 } 2165 return bs->job; 2166 } 2167 2168 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2169 { 2170 BlockJob *job = find_block_job(device); 2171 2172 if (!job) { 2173 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2174 return; 2175 } 2176 2177 block_job_set_speed(job, speed, errp); 2178 } 2179 2180 void qmp_block_job_cancel(const char *device, 2181 bool has_force, bool force, Error **errp) 2182 { 2183 BlockJob *job = find_block_job(device); 2184 2185 if (!has_force) { 2186 force = false; 2187 } 2188 2189 if (!job) { 2190 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2191 return; 2192 } 2193 if (job->paused && !force) { 2194 error_set(errp, QERR_BLOCK_JOB_PAUSED, device); 2195 return; 2196 } 2197 2198 trace_qmp_block_job_cancel(job); 2199 block_job_cancel(job); 2200 } 2201 2202 void qmp_block_job_pause(const char *device, Error **errp) 2203 { 2204 BlockJob *job = find_block_job(device); 2205 2206 if (!job) { 2207 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2208 return; 2209 } 2210 2211 trace_qmp_block_job_pause(job); 2212 block_job_pause(job); 2213 } 2214 2215 void qmp_block_job_resume(const char *device, Error **errp) 2216 { 2217 BlockJob *job = find_block_job(device); 2218 2219 if (!job) { 2220 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2221 return; 2222 } 2223 2224 trace_qmp_block_job_resume(job); 2225 block_job_resume(job); 2226 } 2227 2228 void qmp_block_job_complete(const char *device, Error **errp) 2229 { 2230 BlockJob *job = find_block_job(device); 2231 2232 if (!job) { 2233 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2234 return; 2235 } 2236 2237 trace_qmp_block_job_complete(job); 2238 block_job_complete(job, errp); 2239 } 2240 2241 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2242 { 2243 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2244 QObject *obj; 2245 QDict *qdict; 2246 Error *local_err = NULL; 2247 2248 /* Require an ID in the top level */ 2249 if (!options->has_id) { 2250 error_setg(errp, "Block device needs an ID"); 2251 goto fail; 2252 } 2253 2254 /* TODO Sort it out in raw-posix and drive_init: Reject aio=native with 2255 * cache.direct=false instead of silently switching to aio=threads, except 2256 * if called from drive_init. 2257 * 2258 * For now, simply forbidding the combination for all drivers will do. */ 2259 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2260 bool direct = options->cache->has_direct && options->cache->direct; 2261 if (!options->has_cache && !direct) { 2262 error_setg(errp, "aio=native requires cache.direct=true"); 2263 goto fail; 2264 } 2265 } 2266 2267 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2268 &options, NULL, &local_err); 2269 if (error_is_set(&local_err)) { 2270 error_propagate(errp, local_err); 2271 goto fail; 2272 } 2273 2274 obj = qmp_output_get_qobject(ov); 2275 qdict = qobject_to_qdict(obj); 2276 2277 qdict_flatten(qdict); 2278 2279 blockdev_init(NULL, qdict, IF_NONE, &local_err); 2280 if (error_is_set(&local_err)) { 2281 error_propagate(errp, local_err); 2282 goto fail; 2283 } 2284 2285 fail: 2286 qmp_output_visitor_cleanup(ov); 2287 } 2288 2289 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 2290 { 2291 BlockJobInfoList **prev = opaque; 2292 BlockJob *job = bs->job; 2293 2294 if (job) { 2295 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2296 elem->value = block_job_query(bs->job); 2297 (*prev)->next = elem; 2298 *prev = elem; 2299 } 2300 } 2301 2302 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2303 { 2304 /* Dummy is a fake list element for holding the head pointer */ 2305 BlockJobInfoList dummy = {}; 2306 BlockJobInfoList *prev = &dummy; 2307 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 2308 return dummy.next; 2309 } 2310 2311 QemuOptsList qemu_common_drive_opts = { 2312 .name = "drive", 2313 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2314 .desc = { 2315 { 2316 .name = "snapshot", 2317 .type = QEMU_OPT_BOOL, 2318 .help = "enable/disable snapshot mode", 2319 },{ 2320 .name = "discard", 2321 .type = QEMU_OPT_STRING, 2322 .help = "discard operation (ignore/off, unmap/on)", 2323 },{ 2324 .name = "cache.writeback", 2325 .type = QEMU_OPT_BOOL, 2326 .help = "enables writeback mode for any caches", 2327 },{ 2328 .name = "cache.direct", 2329 .type = QEMU_OPT_BOOL, 2330 .help = "enables use of O_DIRECT (bypass the host page cache)", 2331 },{ 2332 .name = "cache.no-flush", 2333 .type = QEMU_OPT_BOOL, 2334 .help = "ignore any flush requests for the device", 2335 },{ 2336 .name = "aio", 2337 .type = QEMU_OPT_STRING, 2338 .help = "host AIO implementation (threads, native)", 2339 },{ 2340 .name = "format", 2341 .type = QEMU_OPT_STRING, 2342 .help = "disk format (raw, qcow2, ...)", 2343 },{ 2344 .name = "serial", 2345 .type = QEMU_OPT_STRING, 2346 .help = "disk serial number", 2347 },{ 2348 .name = "rerror", 2349 .type = QEMU_OPT_STRING, 2350 .help = "read error action", 2351 },{ 2352 .name = "werror", 2353 .type = QEMU_OPT_STRING, 2354 .help = "write error action", 2355 },{ 2356 .name = "read-only", 2357 .type = QEMU_OPT_BOOL, 2358 .help = "open drive file as read-only", 2359 },{ 2360 .name = "throttling.iops-total", 2361 .type = QEMU_OPT_NUMBER, 2362 .help = "limit total I/O operations per second", 2363 },{ 2364 .name = "throttling.iops-read", 2365 .type = QEMU_OPT_NUMBER, 2366 .help = "limit read operations per second", 2367 },{ 2368 .name = "throttling.iops-write", 2369 .type = QEMU_OPT_NUMBER, 2370 .help = "limit write operations per second", 2371 },{ 2372 .name = "throttling.bps-total", 2373 .type = QEMU_OPT_NUMBER, 2374 .help = "limit total bytes per second", 2375 },{ 2376 .name = "throttling.bps-read", 2377 .type = QEMU_OPT_NUMBER, 2378 .help = "limit read bytes per second", 2379 },{ 2380 .name = "throttling.bps-write", 2381 .type = QEMU_OPT_NUMBER, 2382 .help = "limit write bytes per second", 2383 },{ 2384 .name = "throttling.iops-total-max", 2385 .type = QEMU_OPT_NUMBER, 2386 .help = "I/O operations burst", 2387 },{ 2388 .name = "throttling.iops-read-max", 2389 .type = QEMU_OPT_NUMBER, 2390 .help = "I/O operations read burst", 2391 },{ 2392 .name = "throttling.iops-write-max", 2393 .type = QEMU_OPT_NUMBER, 2394 .help = "I/O operations write burst", 2395 },{ 2396 .name = "throttling.bps-total-max", 2397 .type = QEMU_OPT_NUMBER, 2398 .help = "total bytes burst", 2399 },{ 2400 .name = "throttling.bps-read-max", 2401 .type = QEMU_OPT_NUMBER, 2402 .help = "total bytes read burst", 2403 },{ 2404 .name = "throttling.bps-write-max", 2405 .type = QEMU_OPT_NUMBER, 2406 .help = "total bytes write burst", 2407 },{ 2408 .name = "throttling.iops-size", 2409 .type = QEMU_OPT_NUMBER, 2410 .help = "when limiting by iops max size of an I/O in bytes", 2411 },{ 2412 .name = "copy-on-read", 2413 .type = QEMU_OPT_BOOL, 2414 .help = "copy read data from backing file into image file", 2415 }, 2416 { /* end of list */ } 2417 }, 2418 }; 2419 2420 QemuOptsList qemu_drive_opts = { 2421 .name = "drive", 2422 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2423 .desc = { 2424 /* 2425 * no elements => accept any params 2426 * validation will happen later 2427 */ 2428 { /* end of list */ } 2429 }, 2430 }; 2431