1 /* 2 * QEMU host block devices 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * later. See the COPYING file in the top-level directory. 8 * 9 * This file incorporates work covered by the following copyright and 10 * permission notice: 11 * 12 * Copyright (c) 2003-2008 Fabrice Bellard 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a copy 15 * of this software and associated documentation files (the "Software"), to deal 16 * in the Software without restriction, including without limitation the rights 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 18 * copies of the Software, and to permit persons to whom the Software is 19 * furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice shall be included in 22 * all copies or substantial portions of the Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 30 * THE SOFTWARE. 31 */ 32 33 #include "sysemu/blockdev.h" 34 #include "hw/block/block.h" 35 #include "block/blockjob.h" 36 #include "monitor/monitor.h" 37 #include "qemu/option.h" 38 #include "qemu/config-file.h" 39 #include "qapi/qmp/types.h" 40 #include "qapi-visit.h" 41 #include "qapi/qmp-output-visitor.h" 42 #include "qapi/util.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_del(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 void drive_del(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 typedef struct { 231 QEMUBH *bh; 232 BlockDriverState *bs; 233 } BDRVPutRefBH; 234 235 static void bdrv_put_ref_bh(void *opaque) 236 { 237 BDRVPutRefBH *s = opaque; 238 239 bdrv_unref(s->bs); 240 qemu_bh_delete(s->bh); 241 g_free(s); 242 } 243 244 /* 245 * Release a BDS reference in a BH 246 * 247 * It is not safe to use bdrv_unref() from a callback function when the callers 248 * still need the BlockDriverState. In such cases we schedule a BH to release 249 * the reference. 250 */ 251 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 252 { 253 BDRVPutRefBH *s; 254 255 s = g_new(BDRVPutRefBH, 1); 256 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 257 s->bs = bs; 258 qemu_bh_schedule(s->bh); 259 } 260 261 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 262 { 263 if (!strcmp(buf, "ignore")) { 264 return BLOCKDEV_ON_ERROR_IGNORE; 265 } else if (!is_read && !strcmp(buf, "enospc")) { 266 return BLOCKDEV_ON_ERROR_ENOSPC; 267 } else if (!strcmp(buf, "stop")) { 268 return BLOCKDEV_ON_ERROR_STOP; 269 } else if (!strcmp(buf, "report")) { 270 return BLOCKDEV_ON_ERROR_REPORT; 271 } else { 272 error_setg(errp, "'%s' invalid %s error action", 273 buf, is_read ? "read" : "write"); 274 return -1; 275 } 276 } 277 278 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 279 { 280 if (throttle_conflicting(cfg)) { 281 error_setg(errp, "bps/iops/max total values and read/write values" 282 " cannot be used at the same time"); 283 return false; 284 } 285 286 if (!throttle_is_valid(cfg)) { 287 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 288 return false; 289 } 290 291 return true; 292 } 293 294 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 295 296 /* Takes the ownership of bs_opts */ 297 static DriveInfo *blockdev_init(const char *file, QDict *bs_opts, 298 Error **errp) 299 { 300 const char *buf; 301 int ro = 0; 302 int bdrv_flags = 0; 303 int on_read_error, on_write_error; 304 DriveInfo *dinfo; 305 ThrottleConfig cfg; 306 int snapshot = 0; 307 bool copy_on_read; 308 int ret; 309 Error *error = NULL; 310 QemuOpts *opts; 311 const char *id; 312 bool has_driver_specific_opts; 313 BlockdevDetectZeroesOptions detect_zeroes; 314 BlockDriver *drv = NULL; 315 316 /* Check common options by copying from bs_opts to opts, all other options 317 * stay in bs_opts for processing by bdrv_open(). */ 318 id = qdict_get_try_str(bs_opts, "id"); 319 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 320 if (error) { 321 error_propagate(errp, error); 322 goto err_no_opts; 323 } 324 325 qemu_opts_absorb_qdict(opts, bs_opts, &error); 326 if (error) { 327 error_propagate(errp, error); 328 goto early_err; 329 } 330 331 if (id) { 332 qdict_del(bs_opts, "id"); 333 } 334 335 has_driver_specific_opts = !!qdict_size(bs_opts); 336 337 /* extract parameters */ 338 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 339 ro = qemu_opt_get_bool(opts, "read-only", 0); 340 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 341 342 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 343 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 344 error_setg(errp, "invalid discard option"); 345 goto early_err; 346 } 347 } 348 349 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 350 bdrv_flags |= BDRV_O_CACHE_WB; 351 } 352 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 353 bdrv_flags |= BDRV_O_NOCACHE; 354 } 355 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 356 bdrv_flags |= BDRV_O_NO_FLUSH; 357 } 358 359 #ifdef CONFIG_LINUX_AIO 360 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 361 if (!strcmp(buf, "native")) { 362 bdrv_flags |= BDRV_O_NATIVE_AIO; 363 } else if (!strcmp(buf, "threads")) { 364 /* this is the default */ 365 } else { 366 error_setg(errp, "invalid aio option"); 367 goto early_err; 368 } 369 } 370 #endif 371 372 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 373 if (is_help_option(buf)) { 374 error_printf("Supported formats:"); 375 bdrv_iterate_format(bdrv_format_print, NULL); 376 error_printf("\n"); 377 goto early_err; 378 } 379 380 drv = bdrv_find_format(buf); 381 if (!drv) { 382 error_setg(errp, "'%s' invalid format", buf); 383 goto early_err; 384 } 385 } 386 387 /* disk I/O throttling */ 388 memset(&cfg, 0, sizeof(cfg)); 389 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 390 qemu_opt_get_number(opts, "throttling.bps-total", 0); 391 cfg.buckets[THROTTLE_BPS_READ].avg = 392 qemu_opt_get_number(opts, "throttling.bps-read", 0); 393 cfg.buckets[THROTTLE_BPS_WRITE].avg = 394 qemu_opt_get_number(opts, "throttling.bps-write", 0); 395 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 396 qemu_opt_get_number(opts, "throttling.iops-total", 0); 397 cfg.buckets[THROTTLE_OPS_READ].avg = 398 qemu_opt_get_number(opts, "throttling.iops-read", 0); 399 cfg.buckets[THROTTLE_OPS_WRITE].avg = 400 qemu_opt_get_number(opts, "throttling.iops-write", 0); 401 402 cfg.buckets[THROTTLE_BPS_TOTAL].max = 403 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 404 cfg.buckets[THROTTLE_BPS_READ].max = 405 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 406 cfg.buckets[THROTTLE_BPS_WRITE].max = 407 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 408 cfg.buckets[THROTTLE_OPS_TOTAL].max = 409 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 410 cfg.buckets[THROTTLE_OPS_READ].max = 411 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 412 cfg.buckets[THROTTLE_OPS_WRITE].max = 413 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 414 415 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 416 417 if (!check_throttle_config(&cfg, &error)) { 418 error_propagate(errp, error); 419 goto early_err; 420 } 421 422 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 423 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 424 on_write_error = parse_block_error_action(buf, 0, &error); 425 if (error) { 426 error_propagate(errp, error); 427 goto early_err; 428 } 429 } 430 431 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 432 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 433 on_read_error = parse_block_error_action(buf, 1, &error); 434 if (error) { 435 error_propagate(errp, error); 436 goto early_err; 437 } 438 } 439 440 detect_zeroes = 441 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, 442 qemu_opt_get(opts, "detect-zeroes"), 443 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 444 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 445 &error); 446 if (error) { 447 error_propagate(errp, error); 448 goto early_err; 449 } 450 451 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 452 !(bdrv_flags & BDRV_O_UNMAP)) { 453 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 454 "without setting discard operation to unmap"); 455 goto early_err; 456 } 457 458 /* init */ 459 dinfo = g_malloc0(sizeof(*dinfo)); 460 dinfo->id = g_strdup(qemu_opts_id(opts)); 461 dinfo->bdrv = bdrv_new(dinfo->id, &error); 462 if (error) { 463 error_propagate(errp, error); 464 goto bdrv_new_err; 465 } 466 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 467 dinfo->bdrv->read_only = ro; 468 dinfo->bdrv->detect_zeroes = detect_zeroes; 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 qemu_opts_del(opts); 530 err_no_opts: 531 QDECREF(bs_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 = "serial", 596 .type = QEMU_OPT_STRING, 597 .help = "disk serial number", 598 },{ 599 .name = "file", 600 .type = QEMU_OPT_STRING, 601 .help = "file name", 602 }, 603 604 /* Options that are passed on, but have special semantics with -drive */ 605 { 606 .name = "read-only", 607 .type = QEMU_OPT_BOOL, 608 .help = "open drive file as read-only", 609 },{ 610 .name = "rerror", 611 .type = QEMU_OPT_STRING, 612 .help = "read error action", 613 },{ 614 .name = "werror", 615 .type = QEMU_OPT_STRING, 616 .help = "write error action", 617 },{ 618 .name = "copy-on-read", 619 .type = QEMU_OPT_BOOL, 620 .help = "copy read data from backing file into image file", 621 }, 622 623 { /* end of list */ } 624 }, 625 }; 626 627 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 628 { 629 const char *value; 630 DriveInfo *dinfo = NULL; 631 QDict *bs_opts; 632 QemuOpts *legacy_opts; 633 DriveMediaType media = MEDIA_DISK; 634 BlockInterfaceType type; 635 int cyls, heads, secs, translation; 636 int max_devs, bus_id, unit_id, index; 637 const char *devaddr; 638 const char *werror, *rerror; 639 bool read_only = false; 640 bool copy_on_read; 641 const char *serial; 642 const char *filename; 643 Error *local_err = NULL; 644 645 /* Change legacy command line options into QMP ones */ 646 qemu_opt_rename(all_opts, "iops", "throttling.iops-total"); 647 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read"); 648 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write"); 649 650 qemu_opt_rename(all_opts, "bps", "throttling.bps-total"); 651 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read"); 652 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write"); 653 654 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max"); 655 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max"); 656 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max"); 657 658 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max"); 659 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max"); 660 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max"); 661 662 qemu_opt_rename(all_opts, 663 "iops_size", "throttling.iops-size"); 664 665 qemu_opt_rename(all_opts, "readonly", "read-only"); 666 667 value = qemu_opt_get(all_opts, "cache"); 668 if (value) { 669 int flags = 0; 670 671 if (bdrv_parse_cache_flags(value, &flags) != 0) { 672 error_report("invalid cache option"); 673 return NULL; 674 } 675 676 /* Specific options take precedence */ 677 if (!qemu_opt_get(all_opts, "cache.writeback")) { 678 qemu_opt_set_bool(all_opts, "cache.writeback", 679 !!(flags & BDRV_O_CACHE_WB)); 680 } 681 if (!qemu_opt_get(all_opts, "cache.direct")) { 682 qemu_opt_set_bool(all_opts, "cache.direct", 683 !!(flags & BDRV_O_NOCACHE)); 684 } 685 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 686 qemu_opt_set_bool(all_opts, "cache.no-flush", 687 !!(flags & BDRV_O_NO_FLUSH)); 688 } 689 qemu_opt_unset(all_opts, "cache"); 690 } 691 692 /* Get a QDict for processing the options */ 693 bs_opts = qdict_new(); 694 qemu_opts_to_qdict(all_opts, bs_opts); 695 696 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 697 &error_abort); 698 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 699 if (local_err) { 700 error_report("%s", error_get_pretty(local_err)); 701 error_free(local_err); 702 goto fail; 703 } 704 705 /* Deprecated option boot=[on|off] */ 706 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 707 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 708 "ignored. Future versions will reject this parameter. Please " 709 "update your scripts.\n"); 710 } 711 712 /* Media type */ 713 value = qemu_opt_get(legacy_opts, "media"); 714 if (value) { 715 if (!strcmp(value, "disk")) { 716 media = MEDIA_DISK; 717 } else if (!strcmp(value, "cdrom")) { 718 media = MEDIA_CDROM; 719 read_only = true; 720 } else { 721 error_report("'%s' invalid media", value); 722 goto fail; 723 } 724 } 725 726 /* copy-on-read is disabled with a warning for read-only devices */ 727 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 728 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 729 730 if (read_only && copy_on_read) { 731 error_report("warning: disabling copy-on-read on read-only drive"); 732 copy_on_read = false; 733 } 734 735 qdict_put(bs_opts, "read-only", 736 qstring_from_str(read_only ? "on" : "off")); 737 qdict_put(bs_opts, "copy-on-read", 738 qstring_from_str(copy_on_read ? "on" :"off")); 739 740 /* Controller type */ 741 value = qemu_opt_get(legacy_opts, "if"); 742 if (value) { 743 for (type = 0; 744 type < IF_COUNT && strcmp(value, if_name[type]); 745 type++) { 746 } 747 if (type == IF_COUNT) { 748 error_report("unsupported bus type '%s'", value); 749 goto fail; 750 } 751 } else { 752 type = block_default_type; 753 } 754 755 /* Geometry */ 756 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 757 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 758 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 759 760 if (cyls || heads || secs) { 761 if (cyls < 1) { 762 error_report("invalid physical cyls number"); 763 goto fail; 764 } 765 if (heads < 1) { 766 error_report("invalid physical heads number"); 767 goto fail; 768 } 769 if (secs < 1) { 770 error_report("invalid physical secs number"); 771 goto fail; 772 } 773 } 774 775 translation = BIOS_ATA_TRANSLATION_AUTO; 776 value = qemu_opt_get(legacy_opts, "trans"); 777 if (value != NULL) { 778 if (!cyls) { 779 error_report("'%s' trans must be used with cyls, heads and secs", 780 value); 781 goto fail; 782 } 783 if (!strcmp(value, "none")) { 784 translation = BIOS_ATA_TRANSLATION_NONE; 785 } else if (!strcmp(value, "lba")) { 786 translation = BIOS_ATA_TRANSLATION_LBA; 787 } else if (!strcmp(value, "large")) { 788 translation = BIOS_ATA_TRANSLATION_LARGE; 789 } else if (!strcmp(value, "rechs")) { 790 translation = BIOS_ATA_TRANSLATION_RECHS; 791 } else if (!strcmp(value, "auto")) { 792 translation = BIOS_ATA_TRANSLATION_AUTO; 793 } else { 794 error_report("'%s' invalid translation type", value); 795 goto fail; 796 } 797 } 798 799 if (media == MEDIA_CDROM) { 800 if (cyls || secs || heads) { 801 error_report("CHS can't be set with media=cdrom"); 802 goto fail; 803 } 804 } 805 806 /* Device address specified by bus/unit or index. 807 * If none was specified, try to find the first free one. */ 808 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 809 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 810 index = qemu_opt_get_number(legacy_opts, "index", -1); 811 812 max_devs = if_max_devs[type]; 813 814 if (index != -1) { 815 if (bus_id != 0 || unit_id != -1) { 816 error_report("index cannot be used with bus and unit"); 817 goto fail; 818 } 819 bus_id = drive_index_to_bus_id(type, index); 820 unit_id = drive_index_to_unit_id(type, index); 821 } 822 823 if (unit_id == -1) { 824 unit_id = 0; 825 while (drive_get(type, bus_id, unit_id) != NULL) { 826 unit_id++; 827 if (max_devs && unit_id >= max_devs) { 828 unit_id -= max_devs; 829 bus_id++; 830 } 831 } 832 } 833 834 if (max_devs && unit_id >= max_devs) { 835 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 836 goto fail; 837 } 838 839 if (drive_get(type, bus_id, unit_id) != NULL) { 840 error_report("drive with bus=%d, unit=%d (index=%d) exists", 841 bus_id, unit_id, index); 842 goto fail; 843 } 844 845 /* Serial number */ 846 serial = qemu_opt_get(legacy_opts, "serial"); 847 848 /* no id supplied -> create one */ 849 if (qemu_opts_id(all_opts) == NULL) { 850 char *new_id; 851 const char *mediastr = ""; 852 if (type == IF_IDE || type == IF_SCSI) { 853 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 854 } 855 if (max_devs) { 856 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 857 mediastr, unit_id); 858 } else { 859 new_id = g_strdup_printf("%s%s%i", if_name[type], 860 mediastr, unit_id); 861 } 862 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 863 g_free(new_id); 864 } 865 866 /* Add virtio block device */ 867 devaddr = qemu_opt_get(legacy_opts, "addr"); 868 if (devaddr && type != IF_VIRTIO) { 869 error_report("addr is not supported by this bus type"); 870 goto fail; 871 } 872 873 if (type == IF_VIRTIO) { 874 QemuOpts *devopts; 875 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 876 &error_abort); 877 if (arch_type == QEMU_ARCH_S390X) { 878 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 879 } else { 880 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 881 } 882 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 883 if (devaddr) { 884 qemu_opt_set(devopts, "addr", devaddr); 885 } 886 } 887 888 filename = qemu_opt_get(legacy_opts, "file"); 889 890 /* Check werror/rerror compatibility with if=... */ 891 werror = qemu_opt_get(legacy_opts, "werror"); 892 if (werror != NULL) { 893 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 894 type != IF_NONE) { 895 error_report("werror is not supported by this bus type"); 896 goto fail; 897 } 898 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 899 } 900 901 rerror = qemu_opt_get(legacy_opts, "rerror"); 902 if (rerror != NULL) { 903 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 904 type != IF_NONE) { 905 error_report("rerror is not supported by this bus type"); 906 goto fail; 907 } 908 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 909 } 910 911 /* Actual block device init: Functionality shared with blockdev-add */ 912 dinfo = blockdev_init(filename, bs_opts, &local_err); 913 bs_opts = NULL; 914 if (dinfo == NULL) { 915 if (local_err) { 916 error_report("%s", error_get_pretty(local_err)); 917 error_free(local_err); 918 } 919 goto fail; 920 } else { 921 assert(!local_err); 922 } 923 924 /* Set legacy DriveInfo fields */ 925 dinfo->enable_auto_del = true; 926 dinfo->opts = all_opts; 927 928 dinfo->cyls = cyls; 929 dinfo->heads = heads; 930 dinfo->secs = secs; 931 dinfo->trans = translation; 932 933 dinfo->type = type; 934 dinfo->bus = bus_id; 935 dinfo->unit = unit_id; 936 dinfo->devaddr = devaddr; 937 938 dinfo->serial = g_strdup(serial); 939 940 switch(type) { 941 case IF_IDE: 942 case IF_SCSI: 943 case IF_XEN: 944 case IF_NONE: 945 dinfo->media_cd = media == MEDIA_CDROM; 946 break; 947 default: 948 break; 949 } 950 951 fail: 952 qemu_opts_del(legacy_opts); 953 QDECREF(bs_opts); 954 return dinfo; 955 } 956 957 void do_commit(Monitor *mon, const QDict *qdict) 958 { 959 const char *device = qdict_get_str(qdict, "device"); 960 BlockDriverState *bs; 961 int ret; 962 963 if (!strcmp(device, "all")) { 964 ret = bdrv_commit_all(); 965 } else { 966 bs = bdrv_find(device); 967 if (!bs) { 968 monitor_printf(mon, "Device '%s' not found\n", device); 969 return; 970 } 971 ret = bdrv_commit(bs); 972 } 973 if (ret < 0) { 974 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 975 strerror(-ret)); 976 } 977 } 978 979 static void blockdev_do_action(int kind, void *data, Error **errp) 980 { 981 TransactionAction action; 982 TransactionActionList list; 983 984 action.kind = kind; 985 action.data = data; 986 list.value = &action; 987 list.next = NULL; 988 qmp_transaction(&list, errp); 989 } 990 991 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 992 bool has_node_name, const char *node_name, 993 const char *snapshot_file, 994 bool has_snapshot_node_name, 995 const char *snapshot_node_name, 996 bool has_format, const char *format, 997 bool has_mode, NewImageMode mode, Error **errp) 998 { 999 BlockdevSnapshot snapshot = { 1000 .has_device = has_device, 1001 .device = (char *) device, 1002 .has_node_name = has_node_name, 1003 .node_name = (char *) node_name, 1004 .snapshot_file = (char *) snapshot_file, 1005 .has_snapshot_node_name = has_snapshot_node_name, 1006 .snapshot_node_name = (char *) snapshot_node_name, 1007 .has_format = has_format, 1008 .format = (char *) format, 1009 .has_mode = has_mode, 1010 .mode = mode, 1011 }; 1012 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1013 &snapshot, errp); 1014 } 1015 1016 void qmp_blockdev_snapshot_internal_sync(const char *device, 1017 const char *name, 1018 Error **errp) 1019 { 1020 BlockdevSnapshotInternal snapshot = { 1021 .device = (char *) device, 1022 .name = (char *) name 1023 }; 1024 1025 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1026 &snapshot, errp); 1027 } 1028 1029 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1030 bool has_id, 1031 const char *id, 1032 bool has_name, 1033 const char *name, 1034 Error **errp) 1035 { 1036 BlockDriverState *bs = bdrv_find(device); 1037 QEMUSnapshotInfo sn; 1038 Error *local_err = NULL; 1039 SnapshotInfo *info = NULL; 1040 int ret; 1041 1042 if (!bs) { 1043 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1044 return NULL; 1045 } 1046 1047 if (!has_id) { 1048 id = NULL; 1049 } 1050 1051 if (!has_name) { 1052 name = NULL; 1053 } 1054 1055 if (!id && !name) { 1056 error_setg(errp, "Name or id must be provided"); 1057 return NULL; 1058 } 1059 1060 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1061 if (local_err) { 1062 error_propagate(errp, local_err); 1063 return NULL; 1064 } 1065 if (!ret) { 1066 error_setg(errp, 1067 "Snapshot with id '%s' and name '%s' does not exist on " 1068 "device '%s'", 1069 STR_OR_NULL(id), STR_OR_NULL(name), device); 1070 return NULL; 1071 } 1072 1073 bdrv_snapshot_delete(bs, id, name, &local_err); 1074 if (local_err) { 1075 error_propagate(errp, local_err); 1076 return NULL; 1077 } 1078 1079 info = g_new0(SnapshotInfo, 1); 1080 info->id = g_strdup(sn.id_str); 1081 info->name = g_strdup(sn.name); 1082 info->date_nsec = sn.date_nsec; 1083 info->date_sec = sn.date_sec; 1084 info->vm_state_size = sn.vm_state_size; 1085 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1086 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1087 1088 return info; 1089 } 1090 1091 /* New and old BlockDriverState structs for group snapshots */ 1092 1093 typedef struct BlkTransactionState BlkTransactionState; 1094 1095 /* Only prepare() may fail. In a single transaction, only one of commit() or 1096 abort() will be called, clean() will always be called if it present. */ 1097 typedef struct BdrvActionOps { 1098 /* Size of state struct, in bytes. */ 1099 size_t instance_size; 1100 /* Prepare the work, must NOT be NULL. */ 1101 void (*prepare)(BlkTransactionState *common, Error **errp); 1102 /* Commit the changes, can be NULL. */ 1103 void (*commit)(BlkTransactionState *common); 1104 /* Abort the changes on fail, can be NULL. */ 1105 void (*abort)(BlkTransactionState *common); 1106 /* Clean up resource in the end, can be NULL. */ 1107 void (*clean)(BlkTransactionState *common); 1108 } BdrvActionOps; 1109 1110 /* 1111 * This structure must be arranged as first member in child type, assuming 1112 * that compiler will also arrange it to the same address with parent instance. 1113 * Later it will be used in free(). 1114 */ 1115 struct BlkTransactionState { 1116 TransactionAction *action; 1117 const BdrvActionOps *ops; 1118 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1119 }; 1120 1121 /* internal snapshot private data */ 1122 typedef struct InternalSnapshotState { 1123 BlkTransactionState common; 1124 BlockDriverState *bs; 1125 QEMUSnapshotInfo sn; 1126 } InternalSnapshotState; 1127 1128 static void internal_snapshot_prepare(BlkTransactionState *common, 1129 Error **errp) 1130 { 1131 Error *local_err = NULL; 1132 const char *device; 1133 const char *name; 1134 BlockDriverState *bs; 1135 QEMUSnapshotInfo old_sn, *sn; 1136 bool ret; 1137 qemu_timeval tv; 1138 BlockdevSnapshotInternal *internal; 1139 InternalSnapshotState *state; 1140 int ret1; 1141 1142 g_assert(common->action->kind == 1143 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1144 internal = common->action->blockdev_snapshot_internal_sync; 1145 state = DO_UPCAST(InternalSnapshotState, common, common); 1146 1147 /* 1. parse input */ 1148 device = internal->device; 1149 name = internal->name; 1150 1151 /* 2. check for validation */ 1152 bs = bdrv_find(device); 1153 if (!bs) { 1154 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1155 return; 1156 } 1157 1158 if (!bdrv_is_inserted(bs)) { 1159 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1160 return; 1161 } 1162 1163 if (bdrv_is_read_only(bs)) { 1164 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1165 return; 1166 } 1167 1168 if (!bdrv_can_snapshot(bs)) { 1169 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1170 bs->drv->format_name, device, "internal snapshot"); 1171 return; 1172 } 1173 1174 if (!strlen(name)) { 1175 error_setg(errp, "Name is empty"); 1176 return; 1177 } 1178 1179 /* check whether a snapshot with name exist */ 1180 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1181 &local_err); 1182 if (local_err) { 1183 error_propagate(errp, local_err); 1184 return; 1185 } else if (ret) { 1186 error_setg(errp, 1187 "Snapshot with name '%s' already exists on device '%s'", 1188 name, device); 1189 return; 1190 } 1191 1192 /* 3. take the snapshot */ 1193 sn = &state->sn; 1194 pstrcpy(sn->name, sizeof(sn->name), name); 1195 qemu_gettimeofday(&tv); 1196 sn->date_sec = tv.tv_sec; 1197 sn->date_nsec = tv.tv_usec * 1000; 1198 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1199 1200 ret1 = bdrv_snapshot_create(bs, sn); 1201 if (ret1 < 0) { 1202 error_setg_errno(errp, -ret1, 1203 "Failed to create snapshot '%s' on device '%s'", 1204 name, device); 1205 return; 1206 } 1207 1208 /* 4. succeed, mark a snapshot is created */ 1209 state->bs = bs; 1210 } 1211 1212 static void internal_snapshot_abort(BlkTransactionState *common) 1213 { 1214 InternalSnapshotState *state = 1215 DO_UPCAST(InternalSnapshotState, common, common); 1216 BlockDriverState *bs = state->bs; 1217 QEMUSnapshotInfo *sn = &state->sn; 1218 Error *local_error = NULL; 1219 1220 if (!bs) { 1221 return; 1222 } 1223 1224 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1225 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1226 "device '%s' in abort: %s", 1227 sn->id_str, 1228 sn->name, 1229 bdrv_get_device_name(bs), 1230 error_get_pretty(local_error)); 1231 error_free(local_error); 1232 } 1233 } 1234 1235 /* external snapshot private data */ 1236 typedef struct ExternalSnapshotState { 1237 BlkTransactionState common; 1238 BlockDriverState *old_bs; 1239 BlockDriverState *new_bs; 1240 } ExternalSnapshotState; 1241 1242 static void external_snapshot_prepare(BlkTransactionState *common, 1243 Error **errp) 1244 { 1245 BlockDriver *drv; 1246 int flags, ret; 1247 QDict *options = NULL; 1248 Error *local_err = NULL; 1249 bool has_device = false; 1250 const char *device; 1251 bool has_node_name = false; 1252 const char *node_name; 1253 bool has_snapshot_node_name = false; 1254 const char *snapshot_node_name; 1255 const char *new_image_file; 1256 const char *format = "qcow2"; 1257 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1258 ExternalSnapshotState *state = 1259 DO_UPCAST(ExternalSnapshotState, common, common); 1260 TransactionAction *action = common->action; 1261 1262 /* get parameters */ 1263 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1264 1265 has_device = action->blockdev_snapshot_sync->has_device; 1266 device = action->blockdev_snapshot_sync->device; 1267 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1268 node_name = action->blockdev_snapshot_sync->node_name; 1269 has_snapshot_node_name = 1270 action->blockdev_snapshot_sync->has_snapshot_node_name; 1271 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1272 1273 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1274 if (action->blockdev_snapshot_sync->has_format) { 1275 format = action->blockdev_snapshot_sync->format; 1276 } 1277 if (action->blockdev_snapshot_sync->has_mode) { 1278 mode = action->blockdev_snapshot_sync->mode; 1279 } 1280 1281 /* start processing */ 1282 drv = bdrv_find_format(format); 1283 if (!drv) { 1284 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1285 return; 1286 } 1287 1288 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1289 has_node_name ? node_name : NULL, 1290 &local_err); 1291 if (local_err) { 1292 error_propagate(errp, local_err); 1293 return; 1294 } 1295 1296 if (has_node_name && !has_snapshot_node_name) { 1297 error_setg(errp, "New snapshot node name missing"); 1298 return; 1299 } 1300 1301 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1302 error_setg(errp, "New snapshot node name already existing"); 1303 return; 1304 } 1305 1306 if (!bdrv_is_inserted(state->old_bs)) { 1307 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1308 return; 1309 } 1310 1311 if (bdrv_op_is_blocked(state->old_bs, 1312 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1313 return; 1314 } 1315 1316 if (!bdrv_is_read_only(state->old_bs)) { 1317 if (bdrv_flush(state->old_bs)) { 1318 error_set(errp, QERR_IO_ERROR); 1319 return; 1320 } 1321 } 1322 1323 if (!bdrv_is_first_non_filter(state->old_bs)) { 1324 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1325 return; 1326 } 1327 1328 flags = state->old_bs->open_flags; 1329 1330 /* create new image w/backing file */ 1331 if (mode != NEW_IMAGE_MODE_EXISTING) { 1332 bdrv_img_create(new_image_file, format, 1333 state->old_bs->filename, 1334 state->old_bs->drv->format_name, 1335 NULL, -1, flags, &local_err, false); 1336 if (local_err) { 1337 error_propagate(errp, local_err); 1338 return; 1339 } 1340 } 1341 1342 if (has_snapshot_node_name) { 1343 options = qdict_new(); 1344 qdict_put(options, "node-name", 1345 qstring_from_str(snapshot_node_name)); 1346 } 1347 1348 /* TODO Inherit bs->options or only take explicit options with an 1349 * extended QMP command? */ 1350 assert(state->new_bs == NULL); 1351 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1352 flags | BDRV_O_NO_BACKING, drv, &local_err); 1353 /* We will manually add the backing_hd field to the bs later */ 1354 if (ret != 0) { 1355 error_propagate(errp, local_err); 1356 } 1357 } 1358 1359 static void external_snapshot_commit(BlkTransactionState *common) 1360 { 1361 ExternalSnapshotState *state = 1362 DO_UPCAST(ExternalSnapshotState, common, common); 1363 1364 /* This removes our old bs and adds the new bs */ 1365 bdrv_append(state->new_bs, state->old_bs); 1366 /* We don't need (or want) to use the transactional 1367 * bdrv_reopen_multiple() across all the entries at once, because we 1368 * don't want to abort all of them if one of them fails the reopen */ 1369 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1370 NULL); 1371 } 1372 1373 static void external_snapshot_abort(BlkTransactionState *common) 1374 { 1375 ExternalSnapshotState *state = 1376 DO_UPCAST(ExternalSnapshotState, common, common); 1377 if (state->new_bs) { 1378 bdrv_unref(state->new_bs); 1379 } 1380 } 1381 1382 typedef struct DriveBackupState { 1383 BlkTransactionState common; 1384 BlockDriverState *bs; 1385 BlockJob *job; 1386 } DriveBackupState; 1387 1388 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1389 { 1390 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1391 DriveBackup *backup; 1392 Error *local_err = NULL; 1393 1394 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1395 backup = common->action->drive_backup; 1396 1397 qmp_drive_backup(backup->device, backup->target, 1398 backup->has_format, backup->format, 1399 backup->sync, 1400 backup->has_mode, backup->mode, 1401 backup->has_speed, backup->speed, 1402 backup->has_on_source_error, backup->on_source_error, 1403 backup->has_on_target_error, backup->on_target_error, 1404 &local_err); 1405 if (local_err) { 1406 error_propagate(errp, local_err); 1407 state->bs = NULL; 1408 state->job = NULL; 1409 return; 1410 } 1411 1412 state->bs = bdrv_find(backup->device); 1413 state->job = state->bs->job; 1414 } 1415 1416 static void drive_backup_abort(BlkTransactionState *common) 1417 { 1418 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1419 BlockDriverState *bs = state->bs; 1420 1421 /* Only cancel if it's the job we started */ 1422 if (bs && bs->job && bs->job == state->job) { 1423 block_job_cancel_sync(bs->job); 1424 } 1425 } 1426 1427 static void abort_prepare(BlkTransactionState *common, Error **errp) 1428 { 1429 error_setg(errp, "Transaction aborted using Abort action"); 1430 } 1431 1432 static void abort_commit(BlkTransactionState *common) 1433 { 1434 g_assert_not_reached(); /* this action never succeeds */ 1435 } 1436 1437 static const BdrvActionOps actions[] = { 1438 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1439 .instance_size = sizeof(ExternalSnapshotState), 1440 .prepare = external_snapshot_prepare, 1441 .commit = external_snapshot_commit, 1442 .abort = external_snapshot_abort, 1443 }, 1444 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1445 .instance_size = sizeof(DriveBackupState), 1446 .prepare = drive_backup_prepare, 1447 .abort = drive_backup_abort, 1448 }, 1449 [TRANSACTION_ACTION_KIND_ABORT] = { 1450 .instance_size = sizeof(BlkTransactionState), 1451 .prepare = abort_prepare, 1452 .commit = abort_commit, 1453 }, 1454 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1455 .instance_size = sizeof(InternalSnapshotState), 1456 .prepare = internal_snapshot_prepare, 1457 .abort = internal_snapshot_abort, 1458 }, 1459 }; 1460 1461 /* 1462 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1463 * then we do not pivot any of the devices in the group, and abandon the 1464 * snapshots 1465 */ 1466 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1467 { 1468 TransactionActionList *dev_entry = dev_list; 1469 BlkTransactionState *state, *next; 1470 Error *local_err = NULL; 1471 1472 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1473 QSIMPLEQ_INIT(&snap_bdrv_states); 1474 1475 /* drain all i/o before any snapshots */ 1476 bdrv_drain_all(); 1477 1478 /* We don't do anything in this loop that commits us to the snapshot */ 1479 while (NULL != dev_entry) { 1480 TransactionAction *dev_info = NULL; 1481 const BdrvActionOps *ops; 1482 1483 dev_info = dev_entry->value; 1484 dev_entry = dev_entry->next; 1485 1486 assert(dev_info->kind < ARRAY_SIZE(actions)); 1487 1488 ops = &actions[dev_info->kind]; 1489 assert(ops->instance_size > 0); 1490 1491 state = g_malloc0(ops->instance_size); 1492 state->ops = ops; 1493 state->action = dev_info; 1494 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1495 1496 state->ops->prepare(state, &local_err); 1497 if (local_err) { 1498 error_propagate(errp, local_err); 1499 goto delete_and_fail; 1500 } 1501 } 1502 1503 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1504 if (state->ops->commit) { 1505 state->ops->commit(state); 1506 } 1507 } 1508 1509 /* success */ 1510 goto exit; 1511 1512 delete_and_fail: 1513 /* 1514 * failure, and it is all-or-none; abandon each new bs, and keep using 1515 * the original bs for all images 1516 */ 1517 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1518 if (state->ops->abort) { 1519 state->ops->abort(state); 1520 } 1521 } 1522 exit: 1523 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1524 if (state->ops->clean) { 1525 state->ops->clean(state); 1526 } 1527 g_free(state); 1528 } 1529 } 1530 1531 1532 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1533 { 1534 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1535 return; 1536 } 1537 if (!bdrv_dev_has_removable_media(bs)) { 1538 error_setg(errp, "Device '%s' is not removable", 1539 bdrv_get_device_name(bs)); 1540 return; 1541 } 1542 1543 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1544 bdrv_dev_eject_request(bs, force); 1545 if (!force) { 1546 error_setg(errp, "Device '%s' is locked", 1547 bdrv_get_device_name(bs)); 1548 return; 1549 } 1550 } 1551 1552 bdrv_close(bs); 1553 } 1554 1555 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1556 { 1557 BlockDriverState *bs; 1558 1559 bs = bdrv_find(device); 1560 if (!bs) { 1561 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1562 return; 1563 } 1564 1565 eject_device(bs, force, errp); 1566 } 1567 1568 void qmp_block_passwd(bool has_device, const char *device, 1569 bool has_node_name, const char *node_name, 1570 const char *password, Error **errp) 1571 { 1572 Error *local_err = NULL; 1573 BlockDriverState *bs; 1574 int err; 1575 1576 bs = bdrv_lookup_bs(has_device ? device : NULL, 1577 has_node_name ? node_name : NULL, 1578 &local_err); 1579 if (local_err) { 1580 error_propagate(errp, local_err); 1581 return; 1582 } 1583 1584 err = bdrv_set_key(bs, password); 1585 if (err == -EINVAL) { 1586 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1587 return; 1588 } else if (err < 0) { 1589 error_set(errp, QERR_INVALID_PASSWORD); 1590 return; 1591 } 1592 } 1593 1594 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1595 int bdrv_flags, BlockDriver *drv, 1596 const char *password, Error **errp) 1597 { 1598 Error *local_err = NULL; 1599 int ret; 1600 1601 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1602 if (ret < 0) { 1603 error_propagate(errp, local_err); 1604 return; 1605 } 1606 1607 if (bdrv_key_required(bs)) { 1608 if (password) { 1609 if (bdrv_set_key(bs, password) < 0) { 1610 error_set(errp, QERR_INVALID_PASSWORD); 1611 } 1612 } else { 1613 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1614 bdrv_get_encrypted_filename(bs)); 1615 } 1616 } else if (password) { 1617 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1618 } 1619 } 1620 1621 void qmp_change_blockdev(const char *device, const char *filename, 1622 const char *format, Error **errp) 1623 { 1624 BlockDriverState *bs; 1625 BlockDriver *drv = NULL; 1626 int bdrv_flags; 1627 Error *err = NULL; 1628 1629 bs = bdrv_find(device); 1630 if (!bs) { 1631 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1632 return; 1633 } 1634 1635 if (format) { 1636 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1637 if (!drv) { 1638 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1639 return; 1640 } 1641 } 1642 1643 eject_device(bs, 0, &err); 1644 if (err) { 1645 error_propagate(errp, err); 1646 return; 1647 } 1648 1649 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1650 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1651 1652 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1653 } 1654 1655 /* throttling disk I/O limits */ 1656 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1657 int64_t bps_wr, 1658 int64_t iops, 1659 int64_t iops_rd, 1660 int64_t iops_wr, 1661 bool has_bps_max, 1662 int64_t bps_max, 1663 bool has_bps_rd_max, 1664 int64_t bps_rd_max, 1665 bool has_bps_wr_max, 1666 int64_t bps_wr_max, 1667 bool has_iops_max, 1668 int64_t iops_max, 1669 bool has_iops_rd_max, 1670 int64_t iops_rd_max, 1671 bool has_iops_wr_max, 1672 int64_t iops_wr_max, 1673 bool has_iops_size, 1674 int64_t iops_size, Error **errp) 1675 { 1676 ThrottleConfig cfg; 1677 BlockDriverState *bs; 1678 AioContext *aio_context; 1679 1680 bs = bdrv_find(device); 1681 if (!bs) { 1682 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1683 return; 1684 } 1685 1686 memset(&cfg, 0, sizeof(cfg)); 1687 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1688 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1689 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1690 1691 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1692 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1693 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1694 1695 if (has_bps_max) { 1696 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1697 } 1698 if (has_bps_rd_max) { 1699 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1700 } 1701 if (has_bps_wr_max) { 1702 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1703 } 1704 if (has_iops_max) { 1705 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1706 } 1707 if (has_iops_rd_max) { 1708 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1709 } 1710 if (has_iops_wr_max) { 1711 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1712 } 1713 1714 if (has_iops_size) { 1715 cfg.op_size = iops_size; 1716 } 1717 1718 if (!check_throttle_config(&cfg, errp)) { 1719 return; 1720 } 1721 1722 aio_context = bdrv_get_aio_context(bs); 1723 aio_context_acquire(aio_context); 1724 1725 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1726 bdrv_io_limits_enable(bs); 1727 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1728 bdrv_io_limits_disable(bs); 1729 } 1730 1731 if (bs->io_limits_enabled) { 1732 bdrv_set_io_limits(bs, &cfg); 1733 } 1734 1735 aio_context_release(aio_context); 1736 } 1737 1738 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1739 { 1740 const char *id = qdict_get_str(qdict, "id"); 1741 BlockDriverState *bs; 1742 DriveInfo *dinfo; 1743 AioContext *aio_context; 1744 Error *local_err = NULL; 1745 1746 bs = bdrv_find(id); 1747 if (!bs) { 1748 error_report("Device '%s' not found", id); 1749 return -1; 1750 } 1751 1752 dinfo = drive_get_by_blockdev(bs); 1753 if (dinfo && !dinfo->enable_auto_del) { 1754 error_report("Deleting device added with blockdev-add" 1755 " is not supported"); 1756 return -1; 1757 } 1758 1759 aio_context = bdrv_get_aio_context(bs); 1760 aio_context_acquire(aio_context); 1761 1762 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 1763 error_report("%s", error_get_pretty(local_err)); 1764 error_free(local_err); 1765 aio_context_release(aio_context); 1766 return -1; 1767 } 1768 1769 /* quiesce block driver; prevent further io */ 1770 bdrv_drain_all(); 1771 bdrv_flush(bs); 1772 bdrv_close(bs); 1773 1774 /* if we have a device attached to this BlockDriverState 1775 * then we need to make the drive anonymous until the device 1776 * can be removed. If this is a drive with no device backing 1777 * then we can just get rid of the block driver state right here. 1778 */ 1779 if (bdrv_get_attached_dev(bs)) { 1780 bdrv_make_anon(bs); 1781 1782 /* Further I/O must not pause the guest */ 1783 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1784 BLOCKDEV_ON_ERROR_REPORT); 1785 } else { 1786 drive_del(dinfo); 1787 } 1788 1789 aio_context_release(aio_context); 1790 return 0; 1791 } 1792 1793 void qmp_block_resize(bool has_device, const char *device, 1794 bool has_node_name, const char *node_name, 1795 int64_t size, Error **errp) 1796 { 1797 Error *local_err = NULL; 1798 BlockDriverState *bs; 1799 AioContext *aio_context; 1800 int ret; 1801 1802 bs = bdrv_lookup_bs(has_device ? device : NULL, 1803 has_node_name ? node_name : NULL, 1804 &local_err); 1805 if (local_err) { 1806 error_propagate(errp, local_err); 1807 return; 1808 } 1809 1810 aio_context = bdrv_get_aio_context(bs); 1811 aio_context_acquire(aio_context); 1812 1813 if (!bdrv_is_first_non_filter(bs)) { 1814 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 1815 goto out; 1816 } 1817 1818 if (size < 0) { 1819 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1820 goto out; 1821 } 1822 1823 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { 1824 error_set(errp, QERR_DEVICE_IN_USE, device); 1825 goto out; 1826 } 1827 1828 /* complete all in-flight operations before resizing the device */ 1829 bdrv_drain_all(); 1830 1831 ret = bdrv_truncate(bs, size); 1832 switch (ret) { 1833 case 0: 1834 break; 1835 case -ENOMEDIUM: 1836 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1837 break; 1838 case -ENOTSUP: 1839 error_set(errp, QERR_UNSUPPORTED); 1840 break; 1841 case -EACCES: 1842 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1843 break; 1844 case -EBUSY: 1845 error_set(errp, QERR_DEVICE_IN_USE, device); 1846 break; 1847 default: 1848 error_setg_errno(errp, -ret, "Could not resize"); 1849 break; 1850 } 1851 1852 out: 1853 aio_context_release(aio_context); 1854 } 1855 1856 static void block_job_cb(void *opaque, int ret) 1857 { 1858 BlockDriverState *bs = opaque; 1859 const char *msg = NULL; 1860 1861 trace_block_job_cb(bs, bs->job, ret); 1862 1863 assert(bs->job); 1864 1865 if (ret < 0) { 1866 msg = strerror(-ret); 1867 } 1868 1869 if (block_job_is_cancelled(bs->job)) { 1870 block_job_event_cancelled(bs->job); 1871 } else { 1872 block_job_event_completed(bs->job, msg); 1873 } 1874 1875 bdrv_put_ref_bh_schedule(bs); 1876 } 1877 1878 void qmp_block_stream(const char *device, 1879 bool has_base, const char *base, 1880 bool has_backing_file, const char *backing_file, 1881 bool has_speed, int64_t speed, 1882 bool has_on_error, BlockdevOnError on_error, 1883 Error **errp) 1884 { 1885 BlockDriverState *bs; 1886 BlockDriverState *base_bs = NULL; 1887 Error *local_err = NULL; 1888 const char *base_name = NULL; 1889 1890 if (!has_on_error) { 1891 on_error = BLOCKDEV_ON_ERROR_REPORT; 1892 } 1893 1894 bs = bdrv_find(device); 1895 if (!bs) { 1896 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1897 return; 1898 } 1899 1900 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 1901 return; 1902 } 1903 1904 if (has_base) { 1905 base_bs = bdrv_find_backing_image(bs, base); 1906 if (base_bs == NULL) { 1907 error_set(errp, QERR_BASE_NOT_FOUND, base); 1908 return; 1909 } 1910 base_name = base; 1911 } 1912 1913 /* if we are streaming the entire chain, the result will have no backing 1914 * file, and specifying one is therefore an error */ 1915 if (base_bs == NULL && has_backing_file) { 1916 error_setg(errp, "backing file specified, but streaming the " 1917 "entire chain"); 1918 return; 1919 } 1920 1921 /* backing_file string overrides base bs filename */ 1922 base_name = has_backing_file ? backing_file : base_name; 1923 1924 stream_start(bs, base_bs, base_name, has_speed ? speed : 0, 1925 on_error, block_job_cb, bs, &local_err); 1926 if (local_err) { 1927 error_propagate(errp, local_err); 1928 return; 1929 } 1930 1931 trace_qmp_block_stream(bs, bs->job); 1932 } 1933 1934 void qmp_block_commit(const char *device, 1935 bool has_base, const char *base, 1936 bool has_top, const char *top, 1937 bool has_backing_file, const char *backing_file, 1938 bool has_speed, int64_t speed, 1939 Error **errp) 1940 { 1941 BlockDriverState *bs; 1942 BlockDriverState *base_bs, *top_bs; 1943 Error *local_err = NULL; 1944 /* This will be part of the QMP command, if/when the 1945 * BlockdevOnError change for blkmirror makes it in 1946 */ 1947 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1948 1949 if (!has_speed) { 1950 speed = 0; 1951 } 1952 1953 /* drain all i/o before commits */ 1954 bdrv_drain_all(); 1955 1956 /* Important Note: 1957 * libvirt relies on the DeviceNotFound error class in order to probe for 1958 * live commit feature versions; for this to work, we must make sure to 1959 * perform the device lookup before any generic errors that may occur in a 1960 * scenario in which all optional arguments are omitted. */ 1961 bs = bdrv_find(device); 1962 if (!bs) { 1963 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1964 return; 1965 } 1966 1967 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) { 1968 return; 1969 } 1970 1971 /* default top_bs is the active layer */ 1972 top_bs = bs; 1973 1974 if (has_top && top) { 1975 if (strcmp(bs->filename, top) != 0) { 1976 top_bs = bdrv_find_backing_image(bs, top); 1977 } 1978 } 1979 1980 if (top_bs == NULL) { 1981 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1982 return; 1983 } 1984 1985 if (has_base && base) { 1986 base_bs = bdrv_find_backing_image(top_bs, base); 1987 } else { 1988 base_bs = bdrv_find_base(top_bs); 1989 } 1990 1991 if (base_bs == NULL) { 1992 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1993 return; 1994 } 1995 1996 /* Do not allow attempts to commit an image into itself */ 1997 if (top_bs == base_bs) { 1998 error_setg(errp, "cannot commit an image into itself"); 1999 return; 2000 } 2001 2002 if (top_bs == bs) { 2003 if (has_backing_file) { 2004 error_setg(errp, "'backing-file' specified," 2005 " but 'top' is the active layer"); 2006 return; 2007 } 2008 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 2009 bs, &local_err); 2010 } else { 2011 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 2012 has_backing_file ? backing_file : NULL, &local_err); 2013 } 2014 if (local_err != NULL) { 2015 error_propagate(errp, local_err); 2016 return; 2017 } 2018 } 2019 2020 void qmp_drive_backup(const char *device, const char *target, 2021 bool has_format, const char *format, 2022 enum MirrorSyncMode sync, 2023 bool has_mode, enum NewImageMode mode, 2024 bool has_speed, int64_t speed, 2025 bool has_on_source_error, BlockdevOnError on_source_error, 2026 bool has_on_target_error, BlockdevOnError on_target_error, 2027 Error **errp) 2028 { 2029 BlockDriverState *bs; 2030 BlockDriverState *target_bs; 2031 BlockDriverState *source = NULL; 2032 BlockDriver *drv = NULL; 2033 Error *local_err = NULL; 2034 int flags; 2035 int64_t size; 2036 int ret; 2037 2038 if (!has_speed) { 2039 speed = 0; 2040 } 2041 if (!has_on_source_error) { 2042 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2043 } 2044 if (!has_on_target_error) { 2045 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2046 } 2047 if (!has_mode) { 2048 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2049 } 2050 2051 bs = bdrv_find(device); 2052 if (!bs) { 2053 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2054 return; 2055 } 2056 2057 if (!bdrv_is_inserted(bs)) { 2058 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2059 return; 2060 } 2061 2062 if (!has_format) { 2063 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2064 } 2065 if (format) { 2066 drv = bdrv_find_format(format); 2067 if (!drv) { 2068 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2069 return; 2070 } 2071 } 2072 2073 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2074 return; 2075 } 2076 2077 flags = bs->open_flags | BDRV_O_RDWR; 2078 2079 /* See if we have a backing HD we can use to create our new image 2080 * on top of. */ 2081 if (sync == MIRROR_SYNC_MODE_TOP) { 2082 source = bs->backing_hd; 2083 if (!source) { 2084 sync = MIRROR_SYNC_MODE_FULL; 2085 } 2086 } 2087 if (sync == MIRROR_SYNC_MODE_NONE) { 2088 source = bs; 2089 } 2090 2091 size = bdrv_getlength(bs); 2092 if (size < 0) { 2093 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2094 return; 2095 } 2096 2097 if (mode != NEW_IMAGE_MODE_EXISTING) { 2098 assert(format && drv); 2099 if (source) { 2100 bdrv_img_create(target, format, source->filename, 2101 source->drv->format_name, NULL, 2102 size, flags, &local_err, false); 2103 } else { 2104 bdrv_img_create(target, format, NULL, NULL, NULL, 2105 size, flags, &local_err, false); 2106 } 2107 } 2108 2109 if (local_err) { 2110 error_propagate(errp, local_err); 2111 return; 2112 } 2113 2114 target_bs = NULL; 2115 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2116 if (ret < 0) { 2117 error_propagate(errp, local_err); 2118 return; 2119 } 2120 2121 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2122 block_job_cb, bs, &local_err); 2123 if (local_err != NULL) { 2124 bdrv_unref(target_bs); 2125 error_propagate(errp, local_err); 2126 return; 2127 } 2128 } 2129 2130 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2131 { 2132 return bdrv_named_nodes_list(); 2133 } 2134 2135 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2136 2137 void qmp_drive_mirror(const char *device, const char *target, 2138 bool has_format, const char *format, 2139 bool has_node_name, const char *node_name, 2140 bool has_replaces, const char *replaces, 2141 enum MirrorSyncMode sync, 2142 bool has_mode, enum NewImageMode mode, 2143 bool has_speed, int64_t speed, 2144 bool has_granularity, uint32_t granularity, 2145 bool has_buf_size, int64_t buf_size, 2146 bool has_on_source_error, BlockdevOnError on_source_error, 2147 bool has_on_target_error, BlockdevOnError on_target_error, 2148 Error **errp) 2149 { 2150 BlockDriverState *bs; 2151 BlockDriverState *source, *target_bs; 2152 BlockDriver *drv = NULL; 2153 Error *local_err = NULL; 2154 QDict *options = NULL; 2155 int flags; 2156 int64_t size; 2157 int ret; 2158 2159 if (!has_speed) { 2160 speed = 0; 2161 } 2162 if (!has_on_source_error) { 2163 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2164 } 2165 if (!has_on_target_error) { 2166 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2167 } 2168 if (!has_mode) { 2169 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2170 } 2171 if (!has_granularity) { 2172 granularity = 0; 2173 } 2174 if (!has_buf_size) { 2175 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2176 } 2177 2178 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2179 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", 2180 "a value in range [512B, 64MB]"); 2181 return; 2182 } 2183 if (granularity & (granularity - 1)) { 2184 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2"); 2185 return; 2186 } 2187 2188 bs = bdrv_find(device); 2189 if (!bs) { 2190 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2191 return; 2192 } 2193 2194 if (!bdrv_is_inserted(bs)) { 2195 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2196 return; 2197 } 2198 2199 if (!has_format) { 2200 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2201 } 2202 if (format) { 2203 drv = bdrv_find_format(format); 2204 if (!drv) { 2205 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2206 return; 2207 } 2208 } 2209 2210 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2211 return; 2212 } 2213 2214 flags = bs->open_flags | BDRV_O_RDWR; 2215 source = bs->backing_hd; 2216 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2217 sync = MIRROR_SYNC_MODE_FULL; 2218 } 2219 if (sync == MIRROR_SYNC_MODE_NONE) { 2220 source = bs; 2221 } 2222 2223 size = bdrv_getlength(bs); 2224 if (size < 0) { 2225 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2226 return; 2227 } 2228 2229 if (has_replaces) { 2230 BlockDriverState *to_replace_bs; 2231 2232 if (!has_node_name) { 2233 error_setg(errp, "a node-name must be provided when replacing a" 2234 " named node of the graph"); 2235 return; 2236 } 2237 2238 to_replace_bs = check_to_replace_node(replaces, &local_err); 2239 2240 if (!to_replace_bs) { 2241 error_propagate(errp, local_err); 2242 return; 2243 } 2244 2245 if (size != bdrv_getlength(to_replace_bs)) { 2246 error_setg(errp, "cannot replace image with a mirror image of " 2247 "different size"); 2248 return; 2249 } 2250 } 2251 2252 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2253 && mode != NEW_IMAGE_MODE_EXISTING) 2254 { 2255 /* create new image w/o backing file */ 2256 assert(format && drv); 2257 bdrv_img_create(target, format, 2258 NULL, NULL, NULL, size, flags, &local_err, false); 2259 } else { 2260 switch (mode) { 2261 case NEW_IMAGE_MODE_EXISTING: 2262 break; 2263 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2264 /* create new image with backing file */ 2265 bdrv_img_create(target, format, 2266 source->filename, 2267 source->drv->format_name, 2268 NULL, size, flags, &local_err, false); 2269 break; 2270 default: 2271 abort(); 2272 } 2273 } 2274 2275 if (local_err) { 2276 error_propagate(errp, local_err); 2277 return; 2278 } 2279 2280 if (has_node_name) { 2281 options = qdict_new(); 2282 qdict_put(options, "node-name", qstring_from_str(node_name)); 2283 } 2284 2285 /* Mirroring takes care of copy-on-write using the source's backing 2286 * file. 2287 */ 2288 target_bs = NULL; 2289 ret = bdrv_open(&target_bs, target, NULL, options, 2290 flags | BDRV_O_NO_BACKING, drv, &local_err); 2291 if (ret < 0) { 2292 error_propagate(errp, local_err); 2293 return; 2294 } 2295 2296 /* pass the node name to replace to mirror start since it's loose coupling 2297 * and will allow to check whether the node still exist at mirror completion 2298 */ 2299 mirror_start(bs, target_bs, 2300 has_replaces ? replaces : NULL, 2301 speed, granularity, buf_size, sync, 2302 on_source_error, on_target_error, 2303 block_job_cb, bs, &local_err); 2304 if (local_err != NULL) { 2305 bdrv_unref(target_bs); 2306 error_propagate(errp, local_err); 2307 return; 2308 } 2309 } 2310 2311 static BlockJob *find_block_job(const char *device) 2312 { 2313 BlockDriverState *bs; 2314 2315 bs = bdrv_find(device); 2316 if (!bs || !bs->job) { 2317 return NULL; 2318 } 2319 return bs->job; 2320 } 2321 2322 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2323 { 2324 BlockJob *job = find_block_job(device); 2325 2326 if (!job) { 2327 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2328 return; 2329 } 2330 2331 block_job_set_speed(job, speed, errp); 2332 } 2333 2334 void qmp_block_job_cancel(const char *device, 2335 bool has_force, bool force, Error **errp) 2336 { 2337 BlockJob *job = find_block_job(device); 2338 2339 if (!has_force) { 2340 force = false; 2341 } 2342 2343 if (!job) { 2344 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2345 return; 2346 } 2347 if (job->paused && !force) { 2348 error_setg(errp, "The block job for device '%s' is currently paused", 2349 device); 2350 return; 2351 } 2352 2353 trace_qmp_block_job_cancel(job); 2354 block_job_cancel(job); 2355 } 2356 2357 void qmp_block_job_pause(const char *device, Error **errp) 2358 { 2359 BlockJob *job = find_block_job(device); 2360 2361 if (!job) { 2362 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2363 return; 2364 } 2365 2366 trace_qmp_block_job_pause(job); 2367 block_job_pause(job); 2368 } 2369 2370 void qmp_block_job_resume(const char *device, Error **errp) 2371 { 2372 BlockJob *job = find_block_job(device); 2373 2374 if (!job) { 2375 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2376 return; 2377 } 2378 2379 trace_qmp_block_job_resume(job); 2380 block_job_resume(job); 2381 } 2382 2383 void qmp_block_job_complete(const char *device, Error **errp) 2384 { 2385 BlockJob *job = find_block_job(device); 2386 2387 if (!job) { 2388 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2389 return; 2390 } 2391 2392 trace_qmp_block_job_complete(job); 2393 block_job_complete(job, errp); 2394 } 2395 2396 void qmp_change_backing_file(const char *device, 2397 const char *image_node_name, 2398 const char *backing_file, 2399 Error **errp) 2400 { 2401 BlockDriverState *bs = NULL; 2402 BlockDriverState *image_bs = NULL; 2403 Error *local_err = NULL; 2404 bool ro; 2405 int open_flags; 2406 int ret; 2407 2408 /* find the top layer BDS of the chain */ 2409 bs = bdrv_find(device); 2410 if (!bs) { 2411 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2412 return; 2413 } 2414 2415 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err); 2416 if (local_err) { 2417 error_propagate(errp, local_err); 2418 return; 2419 } 2420 2421 if (!image_bs) { 2422 error_setg(errp, "image file not found"); 2423 return; 2424 } 2425 2426 if (bdrv_find_base(image_bs) == image_bs) { 2427 error_setg(errp, "not allowing backing file change on an image " 2428 "without a backing file"); 2429 return; 2430 } 2431 2432 /* even though we are not necessarily operating on bs, we need it to 2433 * determine if block ops are currently prohibited on the chain */ 2434 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) { 2435 return; 2436 } 2437 2438 /* final sanity check */ 2439 if (!bdrv_chain_contains(bs, image_bs)) { 2440 error_setg(errp, "'%s' and image file are not in the same chain", 2441 device); 2442 return; 2443 } 2444 2445 /* if not r/w, reopen to make r/w */ 2446 open_flags = image_bs->open_flags; 2447 ro = bdrv_is_read_only(image_bs); 2448 2449 if (ro) { 2450 bdrv_reopen(image_bs, open_flags | BDRV_O_RDWR, &local_err); 2451 if (local_err) { 2452 error_propagate(errp, local_err); 2453 return; 2454 } 2455 } 2456 2457 ret = bdrv_change_backing_file(image_bs, backing_file, 2458 image_bs->drv ? image_bs->drv->format_name : ""); 2459 2460 if (ret < 0) { 2461 error_setg_errno(errp, -ret, "Could not change backing file to '%s'", 2462 backing_file); 2463 /* don't exit here, so we can try to restore open flags if 2464 * appropriate */ 2465 } 2466 2467 if (ro) { 2468 bdrv_reopen(image_bs, open_flags, &local_err); 2469 if (local_err) { 2470 error_propagate(errp, local_err); /* will preserve prior errp */ 2471 } 2472 } 2473 } 2474 2475 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2476 { 2477 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2478 DriveInfo *dinfo; 2479 QObject *obj; 2480 QDict *qdict; 2481 Error *local_err = NULL; 2482 2483 /* Require an ID in the top level */ 2484 if (!options->has_id) { 2485 error_setg(errp, "Block device needs an ID"); 2486 goto fail; 2487 } 2488 2489 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 2490 * cache.direct=false instead of silently switching to aio=threads, except 2491 * when called from drive_new(). 2492 * 2493 * For now, simply forbidding the combination for all drivers will do. */ 2494 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2495 bool direct = options->has_cache && 2496 options->cache->has_direct && 2497 options->cache->direct; 2498 if (!direct) { 2499 error_setg(errp, "aio=native requires cache.direct=true"); 2500 goto fail; 2501 } 2502 } 2503 2504 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2505 &options, NULL, &local_err); 2506 if (local_err) { 2507 error_propagate(errp, local_err); 2508 goto fail; 2509 } 2510 2511 obj = qmp_output_get_qobject(ov); 2512 qdict = qobject_to_qdict(obj); 2513 2514 qdict_flatten(qdict); 2515 2516 dinfo = blockdev_init(NULL, qdict, &local_err); 2517 if (local_err) { 2518 error_propagate(errp, local_err); 2519 goto fail; 2520 } 2521 2522 if (bdrv_key_required(dinfo->bdrv)) { 2523 drive_del(dinfo); 2524 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 2525 goto fail; 2526 } 2527 2528 fail: 2529 qmp_output_visitor_cleanup(ov); 2530 } 2531 2532 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 2533 { 2534 BlockJobInfoList **prev = opaque; 2535 BlockJob *job = bs->job; 2536 2537 if (job) { 2538 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2539 elem->value = block_job_query(bs->job); 2540 (*prev)->next = elem; 2541 *prev = elem; 2542 } 2543 } 2544 2545 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2546 { 2547 /* Dummy is a fake list element for holding the head pointer */ 2548 BlockJobInfoList dummy = {}; 2549 BlockJobInfoList *prev = &dummy; 2550 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 2551 return dummy.next; 2552 } 2553 2554 QemuOptsList qemu_common_drive_opts = { 2555 .name = "drive", 2556 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2557 .desc = { 2558 { 2559 .name = "snapshot", 2560 .type = QEMU_OPT_BOOL, 2561 .help = "enable/disable snapshot mode", 2562 },{ 2563 .name = "discard", 2564 .type = QEMU_OPT_STRING, 2565 .help = "discard operation (ignore/off, unmap/on)", 2566 },{ 2567 .name = "cache.writeback", 2568 .type = QEMU_OPT_BOOL, 2569 .help = "enables writeback mode for any caches", 2570 },{ 2571 .name = "cache.direct", 2572 .type = QEMU_OPT_BOOL, 2573 .help = "enables use of O_DIRECT (bypass the host page cache)", 2574 },{ 2575 .name = "cache.no-flush", 2576 .type = QEMU_OPT_BOOL, 2577 .help = "ignore any flush requests for the device", 2578 },{ 2579 .name = "aio", 2580 .type = QEMU_OPT_STRING, 2581 .help = "host AIO implementation (threads, native)", 2582 },{ 2583 .name = "format", 2584 .type = QEMU_OPT_STRING, 2585 .help = "disk format (raw, qcow2, ...)", 2586 },{ 2587 .name = "rerror", 2588 .type = QEMU_OPT_STRING, 2589 .help = "read error action", 2590 },{ 2591 .name = "werror", 2592 .type = QEMU_OPT_STRING, 2593 .help = "write error action", 2594 },{ 2595 .name = "read-only", 2596 .type = QEMU_OPT_BOOL, 2597 .help = "open drive file as read-only", 2598 },{ 2599 .name = "throttling.iops-total", 2600 .type = QEMU_OPT_NUMBER, 2601 .help = "limit total I/O operations per second", 2602 },{ 2603 .name = "throttling.iops-read", 2604 .type = QEMU_OPT_NUMBER, 2605 .help = "limit read operations per second", 2606 },{ 2607 .name = "throttling.iops-write", 2608 .type = QEMU_OPT_NUMBER, 2609 .help = "limit write operations per second", 2610 },{ 2611 .name = "throttling.bps-total", 2612 .type = QEMU_OPT_NUMBER, 2613 .help = "limit total bytes per second", 2614 },{ 2615 .name = "throttling.bps-read", 2616 .type = QEMU_OPT_NUMBER, 2617 .help = "limit read bytes per second", 2618 },{ 2619 .name = "throttling.bps-write", 2620 .type = QEMU_OPT_NUMBER, 2621 .help = "limit write bytes per second", 2622 },{ 2623 .name = "throttling.iops-total-max", 2624 .type = QEMU_OPT_NUMBER, 2625 .help = "I/O operations burst", 2626 },{ 2627 .name = "throttling.iops-read-max", 2628 .type = QEMU_OPT_NUMBER, 2629 .help = "I/O operations read burst", 2630 },{ 2631 .name = "throttling.iops-write-max", 2632 .type = QEMU_OPT_NUMBER, 2633 .help = "I/O operations write burst", 2634 },{ 2635 .name = "throttling.bps-total-max", 2636 .type = QEMU_OPT_NUMBER, 2637 .help = "total bytes burst", 2638 },{ 2639 .name = "throttling.bps-read-max", 2640 .type = QEMU_OPT_NUMBER, 2641 .help = "total bytes read burst", 2642 },{ 2643 .name = "throttling.bps-write-max", 2644 .type = QEMU_OPT_NUMBER, 2645 .help = "total bytes write burst", 2646 },{ 2647 .name = "throttling.iops-size", 2648 .type = QEMU_OPT_NUMBER, 2649 .help = "when limiting by iops max size of an I/O in bytes", 2650 },{ 2651 .name = "copy-on-read", 2652 .type = QEMU_OPT_BOOL, 2653 .help = "copy read data from backing file into image file", 2654 },{ 2655 .name = "detect-zeroes", 2656 .type = QEMU_OPT_STRING, 2657 .help = "try to optimize zero writes (off, on, unmap)", 2658 }, 2659 { /* end of list */ } 2660 }, 2661 }; 2662 2663 QemuOptsList qemu_drive_opts = { 2664 .name = "drive", 2665 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2666 .desc = { 2667 /* 2668 * no elements => accept any params 2669 * validation will happen later 2670 */ 2671 { /* end of list */ } 2672 }, 2673 }; 2674