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