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