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 "sysemu/sysemu.h" 43 #include "block/block_int.h" 44 #include "qmp-commands.h" 45 #include "trace.h" 46 #include "sysemu/arch_init.h" 47 48 static QTAILQ_HEAD(drivelist, DriveInfo) drives = QTAILQ_HEAD_INITIALIZER(drives); 49 50 static const char *const if_name[IF_COUNT] = { 51 [IF_NONE] = "none", 52 [IF_IDE] = "ide", 53 [IF_SCSI] = "scsi", 54 [IF_FLOPPY] = "floppy", 55 [IF_PFLASH] = "pflash", 56 [IF_MTD] = "mtd", 57 [IF_SD] = "sd", 58 [IF_VIRTIO] = "virtio", 59 [IF_XEN] = "xen", 60 }; 61 62 static const int if_max_devs[IF_COUNT] = { 63 /* 64 * Do not change these numbers! They govern how drive option 65 * index maps to unit and bus. That mapping is ABI. 66 * 67 * All controllers used to imlement if=T drives need to support 68 * if_max_devs[T] units, for any T with if_max_devs[T] != 0. 69 * Otherwise, some index values map to "impossible" bus, unit 70 * values. 71 * 72 * For instance, if you change [IF_SCSI] to 255, -drive 73 * if=scsi,index=12 no longer means bus=1,unit=5, but 74 * bus=0,unit=12. With an lsi53c895a controller (7 units max), 75 * the drive can't be set up. Regression. 76 */ 77 [IF_IDE] = 2, 78 [IF_SCSI] = 7, 79 }; 80 81 /* 82 * We automatically delete the drive when a device using it gets 83 * unplugged. Questionable feature, but we can't just drop it. 84 * Device models call blockdev_mark_auto_del() to schedule the 85 * automatic deletion, and generic qdev code calls blockdev_auto_del() 86 * when deletion is actually safe. 87 */ 88 void blockdev_mark_auto_del(BlockDriverState *bs) 89 { 90 DriveInfo *dinfo = drive_get_by_blockdev(bs); 91 92 if (dinfo && !dinfo->enable_auto_del) { 93 return; 94 } 95 96 if (bs->job) { 97 block_job_cancel(bs->job); 98 } 99 if (dinfo) { 100 dinfo->auto_del = 1; 101 } 102 } 103 104 void blockdev_auto_del(BlockDriverState *bs) 105 { 106 DriveInfo *dinfo = drive_get_by_blockdev(bs); 107 108 if (dinfo && dinfo->auto_del) { 109 drive_del(dinfo); 110 } 111 } 112 113 static int drive_index_to_bus_id(BlockInterfaceType type, int index) 114 { 115 int max_devs = if_max_devs[type]; 116 return max_devs ? index / max_devs : 0; 117 } 118 119 static int drive_index_to_unit_id(BlockInterfaceType type, int index) 120 { 121 int max_devs = if_max_devs[type]; 122 return max_devs ? index % max_devs : index; 123 } 124 125 QemuOpts *drive_def(const char *optstr) 126 { 127 return qemu_opts_parse(qemu_find_opts("drive"), optstr, 0); 128 } 129 130 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file, 131 const char *optstr) 132 { 133 QemuOpts *opts; 134 char buf[32]; 135 136 opts = drive_def(optstr); 137 if (!opts) { 138 return NULL; 139 } 140 if (type != IF_DEFAULT) { 141 qemu_opt_set(opts, "if", if_name[type]); 142 } 143 if (index >= 0) { 144 snprintf(buf, sizeof(buf), "%d", index); 145 qemu_opt_set(opts, "index", buf); 146 } 147 if (file) 148 qemu_opt_set(opts, "file", file); 149 return opts; 150 } 151 152 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit) 153 { 154 DriveInfo *dinfo; 155 156 /* seek interface, bus and unit */ 157 158 QTAILQ_FOREACH(dinfo, &drives, next) { 159 if (dinfo->type == type && 160 dinfo->bus == bus && 161 dinfo->unit == unit) 162 return dinfo; 163 } 164 165 return NULL; 166 } 167 168 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index) 169 { 170 return drive_get(type, 171 drive_index_to_bus_id(type, index), 172 drive_index_to_unit_id(type, index)); 173 } 174 175 int drive_get_max_bus(BlockInterfaceType type) 176 { 177 int max_bus; 178 DriveInfo *dinfo; 179 180 max_bus = -1; 181 QTAILQ_FOREACH(dinfo, &drives, next) { 182 if(dinfo->type == type && 183 dinfo->bus > max_bus) 184 max_bus = dinfo->bus; 185 } 186 return max_bus; 187 } 188 189 /* Get a block device. This should only be used for single-drive devices 190 (e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the 191 appropriate bus. */ 192 DriveInfo *drive_get_next(BlockInterfaceType type) 193 { 194 static int next_block_unit[IF_COUNT]; 195 196 return drive_get(type, 0, next_block_unit[type]++); 197 } 198 199 DriveInfo *drive_get_by_blockdev(BlockDriverState *bs) 200 { 201 DriveInfo *dinfo; 202 203 QTAILQ_FOREACH(dinfo, &drives, next) { 204 if (dinfo->bdrv == bs) { 205 return dinfo; 206 } 207 } 208 return NULL; 209 } 210 211 static void bdrv_format_print(void *opaque, const char *name) 212 { 213 error_printf(" %s", name); 214 } 215 216 void drive_del(DriveInfo *dinfo) 217 { 218 if (dinfo->opts) { 219 qemu_opts_del(dinfo->opts); 220 } 221 222 bdrv_unref(dinfo->bdrv); 223 g_free(dinfo->id); 224 QTAILQ_REMOVE(&drives, dinfo, next); 225 g_free(dinfo->serial); 226 g_free(dinfo); 227 } 228 229 typedef struct { 230 QEMUBH *bh; 231 BlockDriverState *bs; 232 } BDRVPutRefBH; 233 234 static void bdrv_put_ref_bh(void *opaque) 235 { 236 BDRVPutRefBH *s = opaque; 237 238 bdrv_unref(s->bs); 239 qemu_bh_delete(s->bh); 240 g_free(s); 241 } 242 243 /* 244 * Release a BDS reference in a BH 245 * 246 * It is not safe to use bdrv_unref() from a callback function when the callers 247 * still need the BlockDriverState. In such cases we schedule a BH to release 248 * the reference. 249 */ 250 static void bdrv_put_ref_bh_schedule(BlockDriverState *bs) 251 { 252 BDRVPutRefBH *s; 253 254 s = g_new(BDRVPutRefBH, 1); 255 s->bh = qemu_bh_new(bdrv_put_ref_bh, s); 256 s->bs = bs; 257 qemu_bh_schedule(s->bh); 258 } 259 260 static int parse_block_error_action(const char *buf, bool is_read, Error **errp) 261 { 262 if (!strcmp(buf, "ignore")) { 263 return BLOCKDEV_ON_ERROR_IGNORE; 264 } else if (!is_read && !strcmp(buf, "enospc")) { 265 return BLOCKDEV_ON_ERROR_ENOSPC; 266 } else if (!strcmp(buf, "stop")) { 267 return BLOCKDEV_ON_ERROR_STOP; 268 } else if (!strcmp(buf, "report")) { 269 return BLOCKDEV_ON_ERROR_REPORT; 270 } else { 271 error_setg(errp, "'%s' invalid %s error action", 272 buf, is_read ? "read" : "write"); 273 return -1; 274 } 275 } 276 277 static inline int parse_enum_option(const char *lookup[], const char *buf, 278 int max, int def, Error **errp) 279 { 280 int i; 281 282 if (!buf) { 283 return def; 284 } 285 286 for (i = 0; i < max; i++) { 287 if (!strcmp(buf, lookup[i])) { 288 return i; 289 } 290 } 291 292 error_setg(errp, "invalid parameter value: %s", buf); 293 return def; 294 } 295 296 static bool check_throttle_config(ThrottleConfig *cfg, Error **errp) 297 { 298 if (throttle_conflicting(cfg)) { 299 error_setg(errp, "bps/iops/max total values and read/write values" 300 " cannot be used at the same time"); 301 return false; 302 } 303 304 if (!throttle_is_valid(cfg)) { 305 error_setg(errp, "bps/iops/maxs values must be 0 or greater"); 306 return false; 307 } 308 309 return true; 310 } 311 312 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType; 313 314 /* Takes the ownership of bs_opts */ 315 static DriveInfo *blockdev_init(const char *file, QDict *bs_opts, 316 Error **errp) 317 { 318 const char *buf; 319 int ro = 0; 320 int bdrv_flags = 0; 321 int on_read_error, on_write_error; 322 DriveInfo *dinfo; 323 ThrottleConfig cfg; 324 int snapshot = 0; 325 bool copy_on_read; 326 int ret; 327 Error *error = NULL; 328 QemuOpts *opts; 329 const char *id; 330 bool has_driver_specific_opts; 331 BlockdevDetectZeroesOptions detect_zeroes; 332 BlockDriver *drv = NULL; 333 334 /* Check common options by copying from bs_opts to opts, all other options 335 * stay in bs_opts for processing by bdrv_open(). */ 336 id = qdict_get_try_str(bs_opts, "id"); 337 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error); 338 if (error) { 339 error_propagate(errp, error); 340 goto err_no_opts; 341 } 342 343 qemu_opts_absorb_qdict(opts, bs_opts, &error); 344 if (error) { 345 error_propagate(errp, error); 346 goto early_err; 347 } 348 349 if (id) { 350 qdict_del(bs_opts, "id"); 351 } 352 353 has_driver_specific_opts = !!qdict_size(bs_opts); 354 355 /* extract parameters */ 356 snapshot = qemu_opt_get_bool(opts, "snapshot", 0); 357 ro = qemu_opt_get_bool(opts, "read-only", 0); 358 copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false); 359 360 if ((buf = qemu_opt_get(opts, "discard")) != NULL) { 361 if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) { 362 error_setg(errp, "invalid discard option"); 363 goto early_err; 364 } 365 } 366 367 if (qemu_opt_get_bool(opts, "cache.writeback", true)) { 368 bdrv_flags |= BDRV_O_CACHE_WB; 369 } 370 if (qemu_opt_get_bool(opts, "cache.direct", false)) { 371 bdrv_flags |= BDRV_O_NOCACHE; 372 } 373 if (qemu_opt_get_bool(opts, "cache.no-flush", false)) { 374 bdrv_flags |= BDRV_O_NO_FLUSH; 375 } 376 377 #ifdef CONFIG_LINUX_AIO 378 if ((buf = qemu_opt_get(opts, "aio")) != NULL) { 379 if (!strcmp(buf, "native")) { 380 bdrv_flags |= BDRV_O_NATIVE_AIO; 381 } else if (!strcmp(buf, "threads")) { 382 /* this is the default */ 383 } else { 384 error_setg(errp, "invalid aio option"); 385 goto early_err; 386 } 387 } 388 #endif 389 390 if ((buf = qemu_opt_get(opts, "format")) != NULL) { 391 if (is_help_option(buf)) { 392 error_printf("Supported formats:"); 393 bdrv_iterate_format(bdrv_format_print, NULL); 394 error_printf("\n"); 395 goto early_err; 396 } 397 398 drv = bdrv_find_format(buf); 399 if (!drv) { 400 error_setg(errp, "'%s' invalid format", buf); 401 goto early_err; 402 } 403 } 404 405 /* disk I/O throttling */ 406 memset(&cfg, 0, sizeof(cfg)); 407 cfg.buckets[THROTTLE_BPS_TOTAL].avg = 408 qemu_opt_get_number(opts, "throttling.bps-total", 0); 409 cfg.buckets[THROTTLE_BPS_READ].avg = 410 qemu_opt_get_number(opts, "throttling.bps-read", 0); 411 cfg.buckets[THROTTLE_BPS_WRITE].avg = 412 qemu_opt_get_number(opts, "throttling.bps-write", 0); 413 cfg.buckets[THROTTLE_OPS_TOTAL].avg = 414 qemu_opt_get_number(opts, "throttling.iops-total", 0); 415 cfg.buckets[THROTTLE_OPS_READ].avg = 416 qemu_opt_get_number(opts, "throttling.iops-read", 0); 417 cfg.buckets[THROTTLE_OPS_WRITE].avg = 418 qemu_opt_get_number(opts, "throttling.iops-write", 0); 419 420 cfg.buckets[THROTTLE_BPS_TOTAL].max = 421 qemu_opt_get_number(opts, "throttling.bps-total-max", 0); 422 cfg.buckets[THROTTLE_BPS_READ].max = 423 qemu_opt_get_number(opts, "throttling.bps-read-max", 0); 424 cfg.buckets[THROTTLE_BPS_WRITE].max = 425 qemu_opt_get_number(opts, "throttling.bps-write-max", 0); 426 cfg.buckets[THROTTLE_OPS_TOTAL].max = 427 qemu_opt_get_number(opts, "throttling.iops-total-max", 0); 428 cfg.buckets[THROTTLE_OPS_READ].max = 429 qemu_opt_get_number(opts, "throttling.iops-read-max", 0); 430 cfg.buckets[THROTTLE_OPS_WRITE].max = 431 qemu_opt_get_number(opts, "throttling.iops-write-max", 0); 432 433 cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0); 434 435 if (!check_throttle_config(&cfg, &error)) { 436 error_propagate(errp, error); 437 goto early_err; 438 } 439 440 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC; 441 if ((buf = qemu_opt_get(opts, "werror")) != NULL) { 442 on_write_error = parse_block_error_action(buf, 0, &error); 443 if (error) { 444 error_propagate(errp, error); 445 goto early_err; 446 } 447 } 448 449 on_read_error = BLOCKDEV_ON_ERROR_REPORT; 450 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) { 451 on_read_error = parse_block_error_action(buf, 1, &error); 452 if (error) { 453 error_propagate(errp, error); 454 goto early_err; 455 } 456 } 457 458 detect_zeroes = 459 parse_enum_option(BlockdevDetectZeroesOptions_lookup, 460 qemu_opt_get(opts, "detect-zeroes"), 461 BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, 462 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, 463 &error); 464 if (error) { 465 error_propagate(errp, error); 466 goto early_err; 467 } 468 469 if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && 470 !(bdrv_flags & BDRV_O_UNMAP)) { 471 error_setg(errp, "setting detect-zeroes to unmap is not allowed " 472 "without setting discard operation to unmap"); 473 goto early_err; 474 } 475 476 /* init */ 477 dinfo = g_malloc0(sizeof(*dinfo)); 478 dinfo->id = g_strdup(qemu_opts_id(opts)); 479 dinfo->bdrv = bdrv_new(dinfo->id, &error); 480 if (error) { 481 error_propagate(errp, error); 482 goto bdrv_new_err; 483 } 484 dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; 485 dinfo->bdrv->read_only = ro; 486 dinfo->bdrv->detect_zeroes = detect_zeroes; 487 QTAILQ_INSERT_TAIL(&drives, dinfo, next); 488 489 bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error); 490 491 /* disk I/O throttling */ 492 if (throttle_enabled(&cfg)) { 493 bdrv_io_limits_enable(dinfo->bdrv); 494 bdrv_set_io_limits(dinfo->bdrv, &cfg); 495 } 496 497 if (!file || !*file) { 498 if (has_driver_specific_opts) { 499 file = NULL; 500 } else { 501 QDECREF(bs_opts); 502 qemu_opts_del(opts); 503 return dinfo; 504 } 505 } 506 if (snapshot) { 507 /* always use cache=unsafe with snapshot */ 508 bdrv_flags &= ~BDRV_O_CACHE_MASK; 509 bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); 510 } 511 512 if (copy_on_read) { 513 bdrv_flags |= BDRV_O_COPY_ON_READ; 514 } 515 516 if (runstate_check(RUN_STATE_INMIGRATE)) { 517 bdrv_flags |= BDRV_O_INCOMING; 518 } 519 520 bdrv_flags |= ro ? 0 : BDRV_O_RDWR; 521 522 QINCREF(bs_opts); 523 ret = bdrv_open(&dinfo->bdrv, file, NULL, bs_opts, bdrv_flags, drv, &error); 524 525 if (ret < 0) { 526 error_setg(errp, "could not open disk image %s: %s", 527 file ?: dinfo->id, error_get_pretty(error)); 528 error_free(error); 529 goto err; 530 } 531 532 if (bdrv_key_required(dinfo->bdrv)) 533 autostart = 0; 534 535 QDECREF(bs_opts); 536 qemu_opts_del(opts); 537 538 return dinfo; 539 540 err: 541 bdrv_unref(dinfo->bdrv); 542 QTAILQ_REMOVE(&drives, dinfo, next); 543 bdrv_new_err: 544 g_free(dinfo->id); 545 g_free(dinfo); 546 early_err: 547 qemu_opts_del(opts); 548 err_no_opts: 549 QDECREF(bs_opts); 550 return NULL; 551 } 552 553 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to) 554 { 555 const char *value; 556 557 value = qemu_opt_get(opts, from); 558 if (value) { 559 qemu_opt_set(opts, to, value); 560 qemu_opt_unset(opts, from); 561 } 562 } 563 564 QemuOptsList qemu_legacy_drive_opts = { 565 .name = "drive", 566 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head), 567 .desc = { 568 { 569 .name = "bus", 570 .type = QEMU_OPT_NUMBER, 571 .help = "bus number", 572 },{ 573 .name = "unit", 574 .type = QEMU_OPT_NUMBER, 575 .help = "unit number (i.e. lun for scsi)", 576 },{ 577 .name = "index", 578 .type = QEMU_OPT_NUMBER, 579 .help = "index number", 580 },{ 581 .name = "media", 582 .type = QEMU_OPT_STRING, 583 .help = "media type (disk, cdrom)", 584 },{ 585 .name = "if", 586 .type = QEMU_OPT_STRING, 587 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)", 588 },{ 589 .name = "cyls", 590 .type = QEMU_OPT_NUMBER, 591 .help = "number of cylinders (ide disk geometry)", 592 },{ 593 .name = "heads", 594 .type = QEMU_OPT_NUMBER, 595 .help = "number of heads (ide disk geometry)", 596 },{ 597 .name = "secs", 598 .type = QEMU_OPT_NUMBER, 599 .help = "number of sectors (ide disk geometry)", 600 },{ 601 .name = "trans", 602 .type = QEMU_OPT_STRING, 603 .help = "chs translation (auto, lba, none)", 604 },{ 605 .name = "boot", 606 .type = QEMU_OPT_BOOL, 607 .help = "(deprecated, ignored)", 608 },{ 609 .name = "addr", 610 .type = QEMU_OPT_STRING, 611 .help = "pci address (virtio only)", 612 },{ 613 .name = "serial", 614 .type = QEMU_OPT_STRING, 615 .help = "disk serial number", 616 },{ 617 .name = "file", 618 .type = QEMU_OPT_STRING, 619 .help = "file name", 620 }, 621 622 /* Options that are passed on, but have special semantics with -drive */ 623 { 624 .name = "read-only", 625 .type = QEMU_OPT_BOOL, 626 .help = "open drive file as read-only", 627 },{ 628 .name = "rerror", 629 .type = QEMU_OPT_STRING, 630 .help = "read error action", 631 },{ 632 .name = "werror", 633 .type = QEMU_OPT_STRING, 634 .help = "write error action", 635 },{ 636 .name = "copy-on-read", 637 .type = QEMU_OPT_BOOL, 638 .help = "copy read data from backing file into image file", 639 }, 640 641 { /* end of list */ } 642 }, 643 }; 644 645 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type) 646 { 647 const char *value; 648 DriveInfo *dinfo = NULL; 649 QDict *bs_opts; 650 QemuOpts *legacy_opts; 651 DriveMediaType media = MEDIA_DISK; 652 BlockInterfaceType type; 653 int cyls, heads, secs, translation; 654 int max_devs, bus_id, unit_id, index; 655 const char *devaddr; 656 const char *werror, *rerror; 657 bool read_only = false; 658 bool copy_on_read; 659 const char *serial; 660 const char *filename; 661 Error *local_err = NULL; 662 663 /* Change legacy command line options into QMP ones */ 664 qemu_opt_rename(all_opts, "iops", "throttling.iops-total"); 665 qemu_opt_rename(all_opts, "iops_rd", "throttling.iops-read"); 666 qemu_opt_rename(all_opts, "iops_wr", "throttling.iops-write"); 667 668 qemu_opt_rename(all_opts, "bps", "throttling.bps-total"); 669 qemu_opt_rename(all_opts, "bps_rd", "throttling.bps-read"); 670 qemu_opt_rename(all_opts, "bps_wr", "throttling.bps-write"); 671 672 qemu_opt_rename(all_opts, "iops_max", "throttling.iops-total-max"); 673 qemu_opt_rename(all_opts, "iops_rd_max", "throttling.iops-read-max"); 674 qemu_opt_rename(all_opts, "iops_wr_max", "throttling.iops-write-max"); 675 676 qemu_opt_rename(all_opts, "bps_max", "throttling.bps-total-max"); 677 qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max"); 678 qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max"); 679 680 qemu_opt_rename(all_opts, 681 "iops_size", "throttling.iops-size"); 682 683 qemu_opt_rename(all_opts, "readonly", "read-only"); 684 685 value = qemu_opt_get(all_opts, "cache"); 686 if (value) { 687 int flags = 0; 688 689 if (bdrv_parse_cache_flags(value, &flags) != 0) { 690 error_report("invalid cache option"); 691 return NULL; 692 } 693 694 /* Specific options take precedence */ 695 if (!qemu_opt_get(all_opts, "cache.writeback")) { 696 qemu_opt_set_bool(all_opts, "cache.writeback", 697 !!(flags & BDRV_O_CACHE_WB)); 698 } 699 if (!qemu_opt_get(all_opts, "cache.direct")) { 700 qemu_opt_set_bool(all_opts, "cache.direct", 701 !!(flags & BDRV_O_NOCACHE)); 702 } 703 if (!qemu_opt_get(all_opts, "cache.no-flush")) { 704 qemu_opt_set_bool(all_opts, "cache.no-flush", 705 !!(flags & BDRV_O_NO_FLUSH)); 706 } 707 qemu_opt_unset(all_opts, "cache"); 708 } 709 710 /* Get a QDict for processing the options */ 711 bs_opts = qdict_new(); 712 qemu_opts_to_qdict(all_opts, bs_opts); 713 714 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0, 715 &error_abort); 716 qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err); 717 if (local_err) { 718 error_report("%s", error_get_pretty(local_err)); 719 error_free(local_err); 720 goto fail; 721 } 722 723 /* Deprecated option boot=[on|off] */ 724 if (qemu_opt_get(legacy_opts, "boot") != NULL) { 725 fprintf(stderr, "qemu-kvm: boot=on|off is deprecated and will be " 726 "ignored. Future versions will reject this parameter. Please " 727 "update your scripts.\n"); 728 } 729 730 /* Media type */ 731 value = qemu_opt_get(legacy_opts, "media"); 732 if (value) { 733 if (!strcmp(value, "disk")) { 734 media = MEDIA_DISK; 735 } else if (!strcmp(value, "cdrom")) { 736 media = MEDIA_CDROM; 737 read_only = true; 738 } else { 739 error_report("'%s' invalid media", value); 740 goto fail; 741 } 742 } 743 744 /* copy-on-read is disabled with a warning for read-only devices */ 745 read_only |= qemu_opt_get_bool(legacy_opts, "read-only", false); 746 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false); 747 748 if (read_only && copy_on_read) { 749 error_report("warning: disabling copy-on-read on read-only drive"); 750 copy_on_read = false; 751 } 752 753 qdict_put(bs_opts, "read-only", 754 qstring_from_str(read_only ? "on" : "off")); 755 qdict_put(bs_opts, "copy-on-read", 756 qstring_from_str(copy_on_read ? "on" :"off")); 757 758 /* Controller type */ 759 value = qemu_opt_get(legacy_opts, "if"); 760 if (value) { 761 for (type = 0; 762 type < IF_COUNT && strcmp(value, if_name[type]); 763 type++) { 764 } 765 if (type == IF_COUNT) { 766 error_report("unsupported bus type '%s'", value); 767 goto fail; 768 } 769 } else { 770 type = block_default_type; 771 } 772 773 /* Geometry */ 774 cyls = qemu_opt_get_number(legacy_opts, "cyls", 0); 775 heads = qemu_opt_get_number(legacy_opts, "heads", 0); 776 secs = qemu_opt_get_number(legacy_opts, "secs", 0); 777 778 if (cyls || heads || secs) { 779 if (cyls < 1) { 780 error_report("invalid physical cyls number"); 781 goto fail; 782 } 783 if (heads < 1) { 784 error_report("invalid physical heads number"); 785 goto fail; 786 } 787 if (secs < 1) { 788 error_report("invalid physical secs number"); 789 goto fail; 790 } 791 } 792 793 translation = BIOS_ATA_TRANSLATION_AUTO; 794 value = qemu_opt_get(legacy_opts, "trans"); 795 if (value != NULL) { 796 if (!cyls) { 797 error_report("'%s' trans must be used with cyls, heads and secs", 798 value); 799 goto fail; 800 } 801 if (!strcmp(value, "none")) { 802 translation = BIOS_ATA_TRANSLATION_NONE; 803 } else if (!strcmp(value, "lba")) { 804 translation = BIOS_ATA_TRANSLATION_LBA; 805 } else if (!strcmp(value, "large")) { 806 translation = BIOS_ATA_TRANSLATION_LARGE; 807 } else if (!strcmp(value, "rechs")) { 808 translation = BIOS_ATA_TRANSLATION_RECHS; 809 } else if (!strcmp(value, "auto")) { 810 translation = BIOS_ATA_TRANSLATION_AUTO; 811 } else { 812 error_report("'%s' invalid translation type", value); 813 goto fail; 814 } 815 } 816 817 if (media == MEDIA_CDROM) { 818 if (cyls || secs || heads) { 819 error_report("CHS can't be set with media=cdrom"); 820 goto fail; 821 } 822 } 823 824 /* Device address specified by bus/unit or index. 825 * If none was specified, try to find the first free one. */ 826 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0); 827 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1); 828 index = qemu_opt_get_number(legacy_opts, "index", -1); 829 830 max_devs = if_max_devs[type]; 831 832 if (index != -1) { 833 if (bus_id != 0 || unit_id != -1) { 834 error_report("index cannot be used with bus and unit"); 835 goto fail; 836 } 837 bus_id = drive_index_to_bus_id(type, index); 838 unit_id = drive_index_to_unit_id(type, index); 839 } 840 841 if (unit_id == -1) { 842 unit_id = 0; 843 while (drive_get(type, bus_id, unit_id) != NULL) { 844 unit_id++; 845 if (max_devs && unit_id >= max_devs) { 846 unit_id -= max_devs; 847 bus_id++; 848 } 849 } 850 } 851 852 if (max_devs && unit_id >= max_devs) { 853 error_report("unit %d too big (max is %d)", unit_id, max_devs - 1); 854 goto fail; 855 } 856 857 if (drive_get(type, bus_id, unit_id) != NULL) { 858 error_report("drive with bus=%d, unit=%d (index=%d) exists", 859 bus_id, unit_id, index); 860 goto fail; 861 } 862 863 /* Serial number */ 864 serial = qemu_opt_get(legacy_opts, "serial"); 865 866 /* no id supplied -> create one */ 867 if (qemu_opts_id(all_opts) == NULL) { 868 char *new_id; 869 const char *mediastr = ""; 870 if (type == IF_IDE || type == IF_SCSI) { 871 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd"; 872 } 873 if (max_devs) { 874 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id, 875 mediastr, unit_id); 876 } else { 877 new_id = g_strdup_printf("%s%s%i", if_name[type], 878 mediastr, unit_id); 879 } 880 qdict_put(bs_opts, "id", qstring_from_str(new_id)); 881 g_free(new_id); 882 } 883 884 /* Add virtio block device */ 885 devaddr = qemu_opt_get(legacy_opts, "addr"); 886 if (devaddr && type != IF_VIRTIO) { 887 error_report("addr is not supported by this bus type"); 888 goto fail; 889 } 890 891 if (type == IF_VIRTIO) { 892 QemuOpts *devopts; 893 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 894 &error_abort); 895 if (arch_type == QEMU_ARCH_S390X) { 896 qemu_opt_set(devopts, "driver", "virtio-blk-s390"); 897 } else { 898 qemu_opt_set(devopts, "driver", "virtio-blk-pci"); 899 } 900 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id")); 901 if (devaddr) { 902 qemu_opt_set(devopts, "addr", devaddr); 903 } 904 } 905 906 filename = qemu_opt_get(legacy_opts, "file"); 907 908 /* Check werror/rerror compatibility with if=... */ 909 werror = qemu_opt_get(legacy_opts, "werror"); 910 if (werror != NULL) { 911 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && 912 type != IF_NONE) { 913 error_report("werror is not supported by this bus type"); 914 goto fail; 915 } 916 qdict_put(bs_opts, "werror", qstring_from_str(werror)); 917 } 918 919 rerror = qemu_opt_get(legacy_opts, "rerror"); 920 if (rerror != NULL) { 921 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && 922 type != IF_NONE) { 923 error_report("rerror is not supported by this bus type"); 924 goto fail; 925 } 926 qdict_put(bs_opts, "rerror", qstring_from_str(rerror)); 927 } 928 929 /* Actual block device init: Functionality shared with blockdev-add */ 930 dinfo = blockdev_init(filename, bs_opts, &local_err); 931 bs_opts = NULL; 932 if (dinfo == NULL) { 933 if (local_err) { 934 error_report("%s", error_get_pretty(local_err)); 935 error_free(local_err); 936 } 937 goto fail; 938 } else { 939 assert(!local_err); 940 } 941 942 /* Set legacy DriveInfo fields */ 943 dinfo->enable_auto_del = true; 944 dinfo->opts = all_opts; 945 946 dinfo->cyls = cyls; 947 dinfo->heads = heads; 948 dinfo->secs = secs; 949 dinfo->trans = translation; 950 951 dinfo->type = type; 952 dinfo->bus = bus_id; 953 dinfo->unit = unit_id; 954 dinfo->devaddr = devaddr; 955 956 dinfo->serial = g_strdup(serial); 957 958 switch(type) { 959 case IF_IDE: 960 case IF_SCSI: 961 case IF_XEN: 962 case IF_NONE: 963 dinfo->media_cd = media == MEDIA_CDROM; 964 break; 965 default: 966 break; 967 } 968 969 fail: 970 qemu_opts_del(legacy_opts); 971 QDECREF(bs_opts); 972 return dinfo; 973 } 974 975 void do_commit(Monitor *mon, const QDict *qdict) 976 { 977 const char *device = qdict_get_str(qdict, "device"); 978 BlockDriverState *bs; 979 int ret; 980 981 if (!strcmp(device, "all")) { 982 ret = bdrv_commit_all(); 983 } else { 984 bs = bdrv_find(device); 985 if (!bs) { 986 monitor_printf(mon, "Device '%s' not found\n", device); 987 return; 988 } 989 ret = bdrv_commit(bs); 990 } 991 if (ret < 0) { 992 monitor_printf(mon, "'commit' error for '%s': %s\n", device, 993 strerror(-ret)); 994 } 995 } 996 997 static void blockdev_do_action(int kind, void *data, Error **errp) 998 { 999 TransactionAction action; 1000 TransactionActionList list; 1001 1002 action.kind = kind; 1003 action.data = data; 1004 list.value = &action; 1005 list.next = NULL; 1006 qmp_transaction(&list, errp); 1007 } 1008 1009 void qmp_blockdev_snapshot_sync(bool has_device, const char *device, 1010 bool has_node_name, const char *node_name, 1011 const char *snapshot_file, 1012 bool has_snapshot_node_name, 1013 const char *snapshot_node_name, 1014 bool has_format, const char *format, 1015 bool has_mode, NewImageMode mode, Error **errp) 1016 { 1017 BlockdevSnapshot snapshot = { 1018 .has_device = has_device, 1019 .device = (char *) device, 1020 .has_node_name = has_node_name, 1021 .node_name = (char *) node_name, 1022 .snapshot_file = (char *) snapshot_file, 1023 .has_snapshot_node_name = has_snapshot_node_name, 1024 .snapshot_node_name = (char *) snapshot_node_name, 1025 .has_format = has_format, 1026 .format = (char *) format, 1027 .has_mode = has_mode, 1028 .mode = mode, 1029 }; 1030 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC, 1031 &snapshot, errp); 1032 } 1033 1034 void qmp_blockdev_snapshot_internal_sync(const char *device, 1035 const char *name, 1036 Error **errp) 1037 { 1038 BlockdevSnapshotInternal snapshot = { 1039 .device = (char *) device, 1040 .name = (char *) name 1041 }; 1042 1043 blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC, 1044 &snapshot, errp); 1045 } 1046 1047 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, 1048 bool has_id, 1049 const char *id, 1050 bool has_name, 1051 const char *name, 1052 Error **errp) 1053 { 1054 BlockDriverState *bs = bdrv_find(device); 1055 QEMUSnapshotInfo sn; 1056 Error *local_err = NULL; 1057 SnapshotInfo *info = NULL; 1058 int ret; 1059 1060 if (!bs) { 1061 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1062 return NULL; 1063 } 1064 1065 if (!has_id) { 1066 id = NULL; 1067 } 1068 1069 if (!has_name) { 1070 name = NULL; 1071 } 1072 1073 if (!id && !name) { 1074 error_setg(errp, "Name or id must be provided"); 1075 return NULL; 1076 } 1077 1078 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err); 1079 if (local_err) { 1080 error_propagate(errp, local_err); 1081 return NULL; 1082 } 1083 if (!ret) { 1084 error_setg(errp, 1085 "Snapshot with id '%s' and name '%s' does not exist on " 1086 "device '%s'", 1087 STR_OR_NULL(id), STR_OR_NULL(name), device); 1088 return NULL; 1089 } 1090 1091 bdrv_snapshot_delete(bs, id, name, &local_err); 1092 if (local_err) { 1093 error_propagate(errp, local_err); 1094 return NULL; 1095 } 1096 1097 info = g_malloc0(sizeof(SnapshotInfo)); 1098 info->id = g_strdup(sn.id_str); 1099 info->name = g_strdup(sn.name); 1100 info->date_nsec = sn.date_nsec; 1101 info->date_sec = sn.date_sec; 1102 info->vm_state_size = sn.vm_state_size; 1103 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; 1104 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; 1105 1106 return info; 1107 } 1108 1109 /* New and old BlockDriverState structs for group snapshots */ 1110 1111 typedef struct BlkTransactionState BlkTransactionState; 1112 1113 /* Only prepare() may fail. In a single transaction, only one of commit() or 1114 abort() will be called, clean() will always be called if it present. */ 1115 typedef struct BdrvActionOps { 1116 /* Size of state struct, in bytes. */ 1117 size_t instance_size; 1118 /* Prepare the work, must NOT be NULL. */ 1119 void (*prepare)(BlkTransactionState *common, Error **errp); 1120 /* Commit the changes, can be NULL. */ 1121 void (*commit)(BlkTransactionState *common); 1122 /* Abort the changes on fail, can be NULL. */ 1123 void (*abort)(BlkTransactionState *common); 1124 /* Clean up resource in the end, can be NULL. */ 1125 void (*clean)(BlkTransactionState *common); 1126 } BdrvActionOps; 1127 1128 /* 1129 * This structure must be arranged as first member in child type, assuming 1130 * that compiler will also arrange it to the same address with parent instance. 1131 * Later it will be used in free(). 1132 */ 1133 struct BlkTransactionState { 1134 TransactionAction *action; 1135 const BdrvActionOps *ops; 1136 QSIMPLEQ_ENTRY(BlkTransactionState) entry; 1137 }; 1138 1139 /* internal snapshot private data */ 1140 typedef struct InternalSnapshotState { 1141 BlkTransactionState common; 1142 BlockDriverState *bs; 1143 QEMUSnapshotInfo sn; 1144 } InternalSnapshotState; 1145 1146 static void internal_snapshot_prepare(BlkTransactionState *common, 1147 Error **errp) 1148 { 1149 Error *local_err = NULL; 1150 const char *device; 1151 const char *name; 1152 BlockDriverState *bs; 1153 QEMUSnapshotInfo old_sn, *sn; 1154 bool ret; 1155 qemu_timeval tv; 1156 BlockdevSnapshotInternal *internal; 1157 InternalSnapshotState *state; 1158 int ret1; 1159 1160 g_assert(common->action->kind == 1161 TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC); 1162 internal = common->action->blockdev_snapshot_internal_sync; 1163 state = DO_UPCAST(InternalSnapshotState, common, common); 1164 1165 /* 1. parse input */ 1166 device = internal->device; 1167 name = internal->name; 1168 1169 /* 2. check for validation */ 1170 bs = bdrv_find(device); 1171 if (!bs) { 1172 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1173 return; 1174 } 1175 1176 if (!bdrv_is_inserted(bs)) { 1177 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1178 return; 1179 } 1180 1181 if (bdrv_is_read_only(bs)) { 1182 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1183 return; 1184 } 1185 1186 if (!bdrv_can_snapshot(bs)) { 1187 error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 1188 bs->drv->format_name, device, "internal snapshot"); 1189 return; 1190 } 1191 1192 if (!strlen(name)) { 1193 error_setg(errp, "Name is empty"); 1194 return; 1195 } 1196 1197 /* check whether a snapshot with name exist */ 1198 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn, 1199 &local_err); 1200 if (local_err) { 1201 error_propagate(errp, local_err); 1202 return; 1203 } else if (ret) { 1204 error_setg(errp, 1205 "Snapshot with name '%s' already exists on device '%s'", 1206 name, device); 1207 return; 1208 } 1209 1210 /* 3. take the snapshot */ 1211 sn = &state->sn; 1212 pstrcpy(sn->name, sizeof(sn->name), name); 1213 qemu_gettimeofday(&tv); 1214 sn->date_sec = tv.tv_sec; 1215 sn->date_nsec = tv.tv_usec * 1000; 1216 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 1217 1218 ret1 = bdrv_snapshot_create(bs, sn); 1219 if (ret1 < 0) { 1220 error_setg_errno(errp, -ret1, 1221 "Failed to create snapshot '%s' on device '%s'", 1222 name, device); 1223 return; 1224 } 1225 1226 /* 4. succeed, mark a snapshot is created */ 1227 state->bs = bs; 1228 } 1229 1230 static void internal_snapshot_abort(BlkTransactionState *common) 1231 { 1232 InternalSnapshotState *state = 1233 DO_UPCAST(InternalSnapshotState, common, common); 1234 BlockDriverState *bs = state->bs; 1235 QEMUSnapshotInfo *sn = &state->sn; 1236 Error *local_error = NULL; 1237 1238 if (!bs) { 1239 return; 1240 } 1241 1242 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) { 1243 error_report("Failed to delete snapshot with id '%s' and name '%s' on " 1244 "device '%s' in abort: %s", 1245 sn->id_str, 1246 sn->name, 1247 bdrv_get_device_name(bs), 1248 error_get_pretty(local_error)); 1249 error_free(local_error); 1250 } 1251 } 1252 1253 /* external snapshot private data */ 1254 typedef struct ExternalSnapshotState { 1255 BlkTransactionState common; 1256 BlockDriverState *old_bs; 1257 BlockDriverState *new_bs; 1258 } ExternalSnapshotState; 1259 1260 static void external_snapshot_prepare(BlkTransactionState *common, 1261 Error **errp) 1262 { 1263 BlockDriver *drv; 1264 int flags, ret; 1265 QDict *options = NULL; 1266 Error *local_err = NULL; 1267 bool has_device = false; 1268 const char *device; 1269 bool has_node_name = false; 1270 const char *node_name; 1271 bool has_snapshot_node_name = false; 1272 const char *snapshot_node_name; 1273 const char *new_image_file; 1274 const char *format = "qcow2"; 1275 enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 1276 ExternalSnapshotState *state = 1277 DO_UPCAST(ExternalSnapshotState, common, common); 1278 TransactionAction *action = common->action; 1279 1280 /* get parameters */ 1281 g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC); 1282 1283 has_device = action->blockdev_snapshot_sync->has_device; 1284 device = action->blockdev_snapshot_sync->device; 1285 has_node_name = action->blockdev_snapshot_sync->has_node_name; 1286 node_name = action->blockdev_snapshot_sync->node_name; 1287 has_snapshot_node_name = 1288 action->blockdev_snapshot_sync->has_snapshot_node_name; 1289 snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name; 1290 1291 new_image_file = action->blockdev_snapshot_sync->snapshot_file; 1292 if (action->blockdev_snapshot_sync->has_format) { 1293 format = action->blockdev_snapshot_sync->format; 1294 } 1295 if (action->blockdev_snapshot_sync->has_mode) { 1296 mode = action->blockdev_snapshot_sync->mode; 1297 } 1298 1299 /* start processing */ 1300 drv = bdrv_find_format(format); 1301 if (!drv) { 1302 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1303 return; 1304 } 1305 1306 state->old_bs = bdrv_lookup_bs(has_device ? device : NULL, 1307 has_node_name ? node_name : NULL, 1308 &local_err); 1309 if (local_err) { 1310 error_propagate(errp, local_err); 1311 return; 1312 } 1313 1314 if (has_node_name && !has_snapshot_node_name) { 1315 error_setg(errp, "New snapshot node name missing"); 1316 return; 1317 } 1318 1319 if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) { 1320 error_setg(errp, "New snapshot node name already existing"); 1321 return; 1322 } 1323 1324 if (!bdrv_is_inserted(state->old_bs)) { 1325 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1326 return; 1327 } 1328 1329 if (bdrv_op_is_blocked(state->old_bs, 1330 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { 1331 return; 1332 } 1333 1334 if (!bdrv_is_read_only(state->old_bs)) { 1335 if (bdrv_flush(state->old_bs)) { 1336 error_set(errp, QERR_IO_ERROR); 1337 return; 1338 } 1339 } 1340 1341 if (!bdrv_is_first_non_filter(state->old_bs)) { 1342 error_set(errp, QERR_FEATURE_DISABLED, "snapshot"); 1343 return; 1344 } 1345 1346 flags = state->old_bs->open_flags; 1347 1348 /* create new image w/backing file */ 1349 if (mode != NEW_IMAGE_MODE_EXISTING) { 1350 bdrv_img_create(new_image_file, format, 1351 state->old_bs->filename, 1352 state->old_bs->drv->format_name, 1353 NULL, -1, flags, &local_err, false); 1354 if (local_err) { 1355 error_propagate(errp, local_err); 1356 return; 1357 } 1358 } 1359 1360 if (has_snapshot_node_name) { 1361 options = qdict_new(); 1362 qdict_put(options, "node-name", 1363 qstring_from_str(snapshot_node_name)); 1364 } 1365 1366 /* TODO Inherit bs->options or only take explicit options with an 1367 * extended QMP command? */ 1368 assert(state->new_bs == NULL); 1369 ret = bdrv_open(&state->new_bs, new_image_file, NULL, options, 1370 flags | BDRV_O_NO_BACKING, drv, &local_err); 1371 /* We will manually add the backing_hd field to the bs later */ 1372 if (ret != 0) { 1373 error_propagate(errp, local_err); 1374 } 1375 } 1376 1377 static void external_snapshot_commit(BlkTransactionState *common) 1378 { 1379 ExternalSnapshotState *state = 1380 DO_UPCAST(ExternalSnapshotState, common, common); 1381 1382 /* This removes our old bs and adds the new bs */ 1383 bdrv_append(state->new_bs, state->old_bs); 1384 /* We don't need (or want) to use the transactional 1385 * bdrv_reopen_multiple() across all the entries at once, because we 1386 * don't want to abort all of them if one of them fails the reopen */ 1387 bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR, 1388 NULL); 1389 } 1390 1391 static void external_snapshot_abort(BlkTransactionState *common) 1392 { 1393 ExternalSnapshotState *state = 1394 DO_UPCAST(ExternalSnapshotState, common, common); 1395 if (state->new_bs) { 1396 bdrv_unref(state->new_bs); 1397 } 1398 } 1399 1400 typedef struct DriveBackupState { 1401 BlkTransactionState common; 1402 BlockDriverState *bs; 1403 BlockJob *job; 1404 } DriveBackupState; 1405 1406 static void drive_backup_prepare(BlkTransactionState *common, Error **errp) 1407 { 1408 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1409 DriveBackup *backup; 1410 Error *local_err = NULL; 1411 1412 assert(common->action->kind == TRANSACTION_ACTION_KIND_DRIVE_BACKUP); 1413 backup = common->action->drive_backup; 1414 1415 qmp_drive_backup(backup->device, backup->target, 1416 backup->has_format, backup->format, 1417 backup->sync, 1418 backup->has_mode, backup->mode, 1419 backup->has_speed, backup->speed, 1420 backup->has_on_source_error, backup->on_source_error, 1421 backup->has_on_target_error, backup->on_target_error, 1422 &local_err); 1423 if (local_err) { 1424 error_propagate(errp, local_err); 1425 state->bs = NULL; 1426 state->job = NULL; 1427 return; 1428 } 1429 1430 state->bs = bdrv_find(backup->device); 1431 state->job = state->bs->job; 1432 } 1433 1434 static void drive_backup_abort(BlkTransactionState *common) 1435 { 1436 DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common); 1437 BlockDriverState *bs = state->bs; 1438 1439 /* Only cancel if it's the job we started */ 1440 if (bs && bs->job && bs->job == state->job) { 1441 block_job_cancel_sync(bs->job); 1442 } 1443 } 1444 1445 static void abort_prepare(BlkTransactionState *common, Error **errp) 1446 { 1447 error_setg(errp, "Transaction aborted using Abort action"); 1448 } 1449 1450 static void abort_commit(BlkTransactionState *common) 1451 { 1452 g_assert_not_reached(); /* this action never succeeds */ 1453 } 1454 1455 static const BdrvActionOps actions[] = { 1456 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC] = { 1457 .instance_size = sizeof(ExternalSnapshotState), 1458 .prepare = external_snapshot_prepare, 1459 .commit = external_snapshot_commit, 1460 .abort = external_snapshot_abort, 1461 }, 1462 [TRANSACTION_ACTION_KIND_DRIVE_BACKUP] = { 1463 .instance_size = sizeof(DriveBackupState), 1464 .prepare = drive_backup_prepare, 1465 .abort = drive_backup_abort, 1466 }, 1467 [TRANSACTION_ACTION_KIND_ABORT] = { 1468 .instance_size = sizeof(BlkTransactionState), 1469 .prepare = abort_prepare, 1470 .commit = abort_commit, 1471 }, 1472 [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC] = { 1473 .instance_size = sizeof(InternalSnapshotState), 1474 .prepare = internal_snapshot_prepare, 1475 .abort = internal_snapshot_abort, 1476 }, 1477 }; 1478 1479 /* 1480 * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail 1481 * then we do not pivot any of the devices in the group, and abandon the 1482 * snapshots 1483 */ 1484 void qmp_transaction(TransactionActionList *dev_list, Error **errp) 1485 { 1486 TransactionActionList *dev_entry = dev_list; 1487 BlkTransactionState *state, *next; 1488 Error *local_err = NULL; 1489 1490 QSIMPLEQ_HEAD(snap_bdrv_states, BlkTransactionState) snap_bdrv_states; 1491 QSIMPLEQ_INIT(&snap_bdrv_states); 1492 1493 /* drain all i/o before any snapshots */ 1494 bdrv_drain_all(); 1495 1496 /* We don't do anything in this loop that commits us to the snapshot */ 1497 while (NULL != dev_entry) { 1498 TransactionAction *dev_info = NULL; 1499 const BdrvActionOps *ops; 1500 1501 dev_info = dev_entry->value; 1502 dev_entry = dev_entry->next; 1503 1504 assert(dev_info->kind < ARRAY_SIZE(actions)); 1505 1506 ops = &actions[dev_info->kind]; 1507 assert(ops->instance_size > 0); 1508 1509 state = g_malloc0(ops->instance_size); 1510 state->ops = ops; 1511 state->action = dev_info; 1512 QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry); 1513 1514 state->ops->prepare(state, &local_err); 1515 if (local_err) { 1516 error_propagate(errp, local_err); 1517 goto delete_and_fail; 1518 } 1519 } 1520 1521 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1522 if (state->ops->commit) { 1523 state->ops->commit(state); 1524 } 1525 } 1526 1527 /* success */ 1528 goto exit; 1529 1530 delete_and_fail: 1531 /* 1532 * failure, and it is all-or-none; abandon each new bs, and keep using 1533 * the original bs for all images 1534 */ 1535 QSIMPLEQ_FOREACH(state, &snap_bdrv_states, entry) { 1536 if (state->ops->abort) { 1537 state->ops->abort(state); 1538 } 1539 } 1540 exit: 1541 QSIMPLEQ_FOREACH_SAFE(state, &snap_bdrv_states, entry, next) { 1542 if (state->ops->clean) { 1543 state->ops->clean(state); 1544 } 1545 g_free(state); 1546 } 1547 } 1548 1549 1550 static void eject_device(BlockDriverState *bs, int force, Error **errp) 1551 { 1552 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { 1553 return; 1554 } 1555 if (!bdrv_dev_has_removable_media(bs)) { 1556 error_setg(errp, "Device '%s' is not removable", 1557 bdrv_get_device_name(bs)); 1558 return; 1559 } 1560 1561 if (bdrv_dev_is_medium_locked(bs) && !bdrv_dev_is_tray_open(bs)) { 1562 bdrv_dev_eject_request(bs, force); 1563 if (!force) { 1564 error_setg(errp, "Device '%s' is locked", 1565 bdrv_get_device_name(bs)); 1566 return; 1567 } 1568 } 1569 1570 bdrv_close(bs); 1571 } 1572 1573 void qmp_eject(const char *device, bool has_force, bool force, Error **errp) 1574 { 1575 BlockDriverState *bs; 1576 1577 bs = bdrv_find(device); 1578 if (!bs) { 1579 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1580 return; 1581 } 1582 1583 eject_device(bs, force, errp); 1584 } 1585 1586 void qmp_block_passwd(bool has_device, const char *device, 1587 bool has_node_name, const char *node_name, 1588 const char *password, Error **errp) 1589 { 1590 Error *local_err = NULL; 1591 BlockDriverState *bs; 1592 int err; 1593 1594 bs = bdrv_lookup_bs(has_device ? device : NULL, 1595 has_node_name ? node_name : NULL, 1596 &local_err); 1597 if (local_err) { 1598 error_propagate(errp, local_err); 1599 return; 1600 } 1601 1602 err = bdrv_set_key(bs, password); 1603 if (err == -EINVAL) { 1604 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1605 return; 1606 } else if (err < 0) { 1607 error_set(errp, QERR_INVALID_PASSWORD); 1608 return; 1609 } 1610 } 1611 1612 static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename, 1613 int bdrv_flags, BlockDriver *drv, 1614 const char *password, Error **errp) 1615 { 1616 Error *local_err = NULL; 1617 int ret; 1618 1619 ret = bdrv_open(&bs, filename, NULL, NULL, bdrv_flags, drv, &local_err); 1620 if (ret < 0) { 1621 error_propagate(errp, local_err); 1622 return; 1623 } 1624 1625 if (bdrv_key_required(bs)) { 1626 if (password) { 1627 if (bdrv_set_key(bs, password) < 0) { 1628 error_set(errp, QERR_INVALID_PASSWORD); 1629 } 1630 } else { 1631 error_set(errp, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs), 1632 bdrv_get_encrypted_filename(bs)); 1633 } 1634 } else if (password) { 1635 error_set(errp, QERR_DEVICE_NOT_ENCRYPTED, bdrv_get_device_name(bs)); 1636 } 1637 } 1638 1639 void qmp_change_blockdev(const char *device, const char *filename, 1640 const char *format, Error **errp) 1641 { 1642 BlockDriverState *bs; 1643 BlockDriver *drv = NULL; 1644 int bdrv_flags; 1645 Error *err = NULL; 1646 1647 bs = bdrv_find(device); 1648 if (!bs) { 1649 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1650 return; 1651 } 1652 1653 if (format) { 1654 drv = bdrv_find_whitelisted_format(format, bs->read_only); 1655 if (!drv) { 1656 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 1657 return; 1658 } 1659 } 1660 1661 eject_device(bs, 0, &err); 1662 if (err) { 1663 error_propagate(errp, err); 1664 return; 1665 } 1666 1667 bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR; 1668 bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0; 1669 1670 qmp_bdrv_open_encrypted(bs, filename, bdrv_flags, drv, NULL, errp); 1671 } 1672 1673 /* throttling disk I/O limits */ 1674 void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd, 1675 int64_t bps_wr, 1676 int64_t iops, 1677 int64_t iops_rd, 1678 int64_t iops_wr, 1679 bool has_bps_max, 1680 int64_t bps_max, 1681 bool has_bps_rd_max, 1682 int64_t bps_rd_max, 1683 bool has_bps_wr_max, 1684 int64_t bps_wr_max, 1685 bool has_iops_max, 1686 int64_t iops_max, 1687 bool has_iops_rd_max, 1688 int64_t iops_rd_max, 1689 bool has_iops_wr_max, 1690 int64_t iops_wr_max, 1691 bool has_iops_size, 1692 int64_t iops_size, Error **errp) 1693 { 1694 ThrottleConfig cfg; 1695 BlockDriverState *bs; 1696 AioContext *aio_context; 1697 1698 bs = bdrv_find(device); 1699 if (!bs) { 1700 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1701 return; 1702 } 1703 1704 memset(&cfg, 0, sizeof(cfg)); 1705 cfg.buckets[THROTTLE_BPS_TOTAL].avg = bps; 1706 cfg.buckets[THROTTLE_BPS_READ].avg = bps_rd; 1707 cfg.buckets[THROTTLE_BPS_WRITE].avg = bps_wr; 1708 1709 cfg.buckets[THROTTLE_OPS_TOTAL].avg = iops; 1710 cfg.buckets[THROTTLE_OPS_READ].avg = iops_rd; 1711 cfg.buckets[THROTTLE_OPS_WRITE].avg = iops_wr; 1712 1713 if (has_bps_max) { 1714 cfg.buckets[THROTTLE_BPS_TOTAL].max = bps_max; 1715 } 1716 if (has_bps_rd_max) { 1717 cfg.buckets[THROTTLE_BPS_READ].max = bps_rd_max; 1718 } 1719 if (has_bps_wr_max) { 1720 cfg.buckets[THROTTLE_BPS_WRITE].max = bps_wr_max; 1721 } 1722 if (has_iops_max) { 1723 cfg.buckets[THROTTLE_OPS_TOTAL].max = iops_max; 1724 } 1725 if (has_iops_rd_max) { 1726 cfg.buckets[THROTTLE_OPS_READ].max = iops_rd_max; 1727 } 1728 if (has_iops_wr_max) { 1729 cfg.buckets[THROTTLE_OPS_WRITE].max = iops_wr_max; 1730 } 1731 1732 if (has_iops_size) { 1733 cfg.op_size = iops_size; 1734 } 1735 1736 if (!check_throttle_config(&cfg, errp)) { 1737 return; 1738 } 1739 1740 aio_context = bdrv_get_aio_context(bs); 1741 aio_context_acquire(aio_context); 1742 1743 if (!bs->io_limits_enabled && throttle_enabled(&cfg)) { 1744 bdrv_io_limits_enable(bs); 1745 } else if (bs->io_limits_enabled && !throttle_enabled(&cfg)) { 1746 bdrv_io_limits_disable(bs); 1747 } 1748 1749 if (bs->io_limits_enabled) { 1750 bdrv_set_io_limits(bs, &cfg); 1751 } 1752 1753 aio_context_release(aio_context); 1754 } 1755 1756 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) 1757 { 1758 const char *id = qdict_get_str(qdict, "id"); 1759 BlockDriverState *bs; 1760 Error *local_err = NULL; 1761 1762 bs = bdrv_find(id); 1763 if (!bs) { 1764 error_report("Device '%s' not found", id); 1765 return -1; 1766 } 1767 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { 1768 error_report("%s", error_get_pretty(local_err)); 1769 error_free(local_err); 1770 return -1; 1771 } 1772 1773 /* quiesce block driver; prevent further io */ 1774 bdrv_drain_all(); 1775 bdrv_flush(bs); 1776 bdrv_close(bs); 1777 1778 /* if we have a device attached to this BlockDriverState 1779 * then we need to make the drive anonymous until the device 1780 * can be removed. If this is a drive with no device backing 1781 * then we can just get rid of the block driver state right here. 1782 */ 1783 if (bdrv_get_attached_dev(bs)) { 1784 bdrv_make_anon(bs); 1785 1786 /* Further I/O must not pause the guest */ 1787 bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT, 1788 BLOCKDEV_ON_ERROR_REPORT); 1789 } else { 1790 drive_del(drive_get_by_blockdev(bs)); 1791 } 1792 1793 return 0; 1794 } 1795 1796 void qmp_block_resize(bool has_device, const char *device, 1797 bool has_node_name, const char *node_name, 1798 int64_t size, Error **errp) 1799 { 1800 Error *local_err = NULL; 1801 BlockDriverState *bs; 1802 int ret; 1803 1804 bs = bdrv_lookup_bs(has_device ? device : NULL, 1805 has_node_name ? node_name : NULL, 1806 &local_err); 1807 if (local_err) { 1808 error_propagate(errp, local_err); 1809 return; 1810 } 1811 1812 if (!bdrv_is_first_non_filter(bs)) { 1813 error_set(errp, QERR_FEATURE_DISABLED, "resize"); 1814 return; 1815 } 1816 1817 if (size < 0) { 1818 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); 1819 return; 1820 } 1821 1822 /* complete all in-flight operations before resizing the device */ 1823 bdrv_drain_all(); 1824 1825 ret = bdrv_truncate(bs, size); 1826 switch (ret) { 1827 case 0: 1828 break; 1829 case -ENOMEDIUM: 1830 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 1831 break; 1832 case -ENOTSUP: 1833 error_set(errp, QERR_UNSUPPORTED); 1834 break; 1835 case -EACCES: 1836 error_set(errp, QERR_DEVICE_IS_READ_ONLY, device); 1837 break; 1838 case -EBUSY: 1839 error_set(errp, QERR_DEVICE_IN_USE, device); 1840 break; 1841 default: 1842 error_setg_errno(errp, -ret, "Could not resize"); 1843 break; 1844 } 1845 } 1846 1847 static void block_job_cb(void *opaque, int ret) 1848 { 1849 BlockDriverState *bs = opaque; 1850 const char *msg = NULL; 1851 1852 trace_block_job_cb(bs, bs->job, ret); 1853 1854 assert(bs->job); 1855 1856 if (ret < 0) { 1857 msg = strerror(-ret); 1858 } 1859 1860 if (block_job_is_cancelled(bs->job)) { 1861 block_job_event_cancelled(bs->job); 1862 } else { 1863 block_job_event_completed(bs->job, msg); 1864 } 1865 1866 bdrv_put_ref_bh_schedule(bs); 1867 } 1868 1869 void qmp_block_stream(const char *device, bool has_base, 1870 const char *base, bool has_speed, int64_t speed, 1871 bool has_on_error, BlockdevOnError on_error, 1872 Error **errp) 1873 { 1874 BlockDriverState *bs; 1875 BlockDriverState *base_bs = NULL; 1876 Error *local_err = NULL; 1877 1878 if (!has_on_error) { 1879 on_error = BLOCKDEV_ON_ERROR_REPORT; 1880 } 1881 1882 bs = bdrv_find(device); 1883 if (!bs) { 1884 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1885 return; 1886 } 1887 1888 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_STREAM, errp)) { 1889 return; 1890 } 1891 1892 if (base) { 1893 base_bs = bdrv_find_backing_image(bs, base); 1894 if (base_bs == NULL) { 1895 error_set(errp, QERR_BASE_NOT_FOUND, base); 1896 return; 1897 } 1898 } 1899 1900 stream_start(bs, base_bs, base, has_speed ? speed : 0, 1901 on_error, block_job_cb, bs, &local_err); 1902 if (local_err) { 1903 error_propagate(errp, local_err); 1904 return; 1905 } 1906 1907 trace_qmp_block_stream(bs, bs->job); 1908 } 1909 1910 void qmp_block_commit(const char *device, 1911 bool has_base, const char *base, const char *top, 1912 bool has_speed, int64_t speed, 1913 Error **errp) 1914 { 1915 BlockDriverState *bs; 1916 BlockDriverState *base_bs, *top_bs; 1917 Error *local_err = NULL; 1918 /* This will be part of the QMP command, if/when the 1919 * BlockdevOnError change for blkmirror makes it in 1920 */ 1921 BlockdevOnError on_error = BLOCKDEV_ON_ERROR_REPORT; 1922 1923 if (!has_speed) { 1924 speed = 0; 1925 } 1926 1927 /* drain all i/o before commits */ 1928 bdrv_drain_all(); 1929 1930 bs = bdrv_find(device); 1931 if (!bs) { 1932 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 1933 return; 1934 } 1935 1936 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, errp)) { 1937 return; 1938 } 1939 1940 /* default top_bs is the active layer */ 1941 top_bs = bs; 1942 1943 if (top) { 1944 if (strcmp(bs->filename, top) != 0) { 1945 top_bs = bdrv_find_backing_image(bs, top); 1946 } 1947 } 1948 1949 if (top_bs == NULL) { 1950 error_setg(errp, "Top image file %s not found", top ? top : "NULL"); 1951 return; 1952 } 1953 1954 if (has_base && base) { 1955 base_bs = bdrv_find_backing_image(top_bs, base); 1956 } else { 1957 base_bs = bdrv_find_base(top_bs); 1958 } 1959 1960 if (base_bs == NULL) { 1961 error_set(errp, QERR_BASE_NOT_FOUND, base ? base : "NULL"); 1962 return; 1963 } 1964 1965 if (top_bs == bs) { 1966 commit_active_start(bs, base_bs, speed, on_error, block_job_cb, 1967 bs, &local_err); 1968 } else { 1969 commit_start(bs, base_bs, top_bs, speed, on_error, block_job_cb, bs, 1970 &local_err); 1971 } 1972 if (local_err != NULL) { 1973 error_propagate(errp, local_err); 1974 return; 1975 } 1976 } 1977 1978 void qmp_drive_backup(const char *device, const char *target, 1979 bool has_format, const char *format, 1980 enum MirrorSyncMode sync, 1981 bool has_mode, enum NewImageMode mode, 1982 bool has_speed, int64_t speed, 1983 bool has_on_source_error, BlockdevOnError on_source_error, 1984 bool has_on_target_error, BlockdevOnError on_target_error, 1985 Error **errp) 1986 { 1987 BlockDriverState *bs; 1988 BlockDriverState *target_bs; 1989 BlockDriverState *source = NULL; 1990 BlockDriver *drv = NULL; 1991 Error *local_err = NULL; 1992 int flags; 1993 int64_t size; 1994 int ret; 1995 1996 if (!has_speed) { 1997 speed = 0; 1998 } 1999 if (!has_on_source_error) { 2000 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2001 } 2002 if (!has_on_target_error) { 2003 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2004 } 2005 if (!has_mode) { 2006 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2007 } 2008 2009 bs = bdrv_find(device); 2010 if (!bs) { 2011 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2012 return; 2013 } 2014 2015 if (!bdrv_is_inserted(bs)) { 2016 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2017 return; 2018 } 2019 2020 if (!has_format) { 2021 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2022 } 2023 if (format) { 2024 drv = bdrv_find_format(format); 2025 if (!drv) { 2026 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2027 return; 2028 } 2029 } 2030 2031 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { 2032 return; 2033 } 2034 2035 flags = bs->open_flags | BDRV_O_RDWR; 2036 2037 /* See if we have a backing HD we can use to create our new image 2038 * on top of. */ 2039 if (sync == MIRROR_SYNC_MODE_TOP) { 2040 source = bs->backing_hd; 2041 if (!source) { 2042 sync = MIRROR_SYNC_MODE_FULL; 2043 } 2044 } 2045 if (sync == MIRROR_SYNC_MODE_NONE) { 2046 source = bs; 2047 } 2048 2049 size = bdrv_getlength(bs); 2050 if (size < 0) { 2051 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2052 return; 2053 } 2054 2055 if (mode != NEW_IMAGE_MODE_EXISTING) { 2056 assert(format && drv); 2057 if (source) { 2058 bdrv_img_create(target, format, source->filename, 2059 source->drv->format_name, NULL, 2060 size, flags, &local_err, false); 2061 } else { 2062 bdrv_img_create(target, format, NULL, NULL, NULL, 2063 size, flags, &local_err, false); 2064 } 2065 } 2066 2067 if (local_err) { 2068 error_propagate(errp, local_err); 2069 return; 2070 } 2071 2072 target_bs = NULL; 2073 ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err); 2074 if (ret < 0) { 2075 error_propagate(errp, local_err); 2076 return; 2077 } 2078 2079 backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error, 2080 block_job_cb, bs, &local_err); 2081 if (local_err != NULL) { 2082 bdrv_unref(target_bs); 2083 error_propagate(errp, local_err); 2084 return; 2085 } 2086 } 2087 2088 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp) 2089 { 2090 return bdrv_named_nodes_list(); 2091 } 2092 2093 #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 2094 2095 void qmp_drive_mirror(const char *device, const char *target, 2096 bool has_format, const char *format, 2097 enum MirrorSyncMode sync, 2098 bool has_mode, enum NewImageMode mode, 2099 bool has_speed, int64_t speed, 2100 bool has_granularity, uint32_t granularity, 2101 bool has_buf_size, int64_t buf_size, 2102 bool has_on_source_error, BlockdevOnError on_source_error, 2103 bool has_on_target_error, BlockdevOnError on_target_error, 2104 Error **errp) 2105 { 2106 BlockDriverState *bs; 2107 BlockDriverState *source, *target_bs; 2108 BlockDriver *drv = NULL; 2109 Error *local_err = NULL; 2110 int flags; 2111 int64_t size; 2112 int ret; 2113 2114 if (!has_speed) { 2115 speed = 0; 2116 } 2117 if (!has_on_source_error) { 2118 on_source_error = BLOCKDEV_ON_ERROR_REPORT; 2119 } 2120 if (!has_on_target_error) { 2121 on_target_error = BLOCKDEV_ON_ERROR_REPORT; 2122 } 2123 if (!has_mode) { 2124 mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; 2125 } 2126 if (!has_granularity) { 2127 granularity = 0; 2128 } 2129 if (!has_buf_size) { 2130 buf_size = DEFAULT_MIRROR_BUF_SIZE; 2131 } 2132 2133 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) { 2134 error_set(errp, QERR_INVALID_PARAMETER, device); 2135 return; 2136 } 2137 if (granularity & (granularity - 1)) { 2138 error_set(errp, QERR_INVALID_PARAMETER, device); 2139 return; 2140 } 2141 2142 bs = bdrv_find(device); 2143 if (!bs) { 2144 error_set(errp, QERR_DEVICE_NOT_FOUND, device); 2145 return; 2146 } 2147 2148 if (!bdrv_is_inserted(bs)) { 2149 error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); 2150 return; 2151 } 2152 2153 if (!has_format) { 2154 format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; 2155 } 2156 if (format) { 2157 drv = bdrv_find_format(format); 2158 if (!drv) { 2159 error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); 2160 return; 2161 } 2162 } 2163 2164 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { 2165 return; 2166 } 2167 2168 flags = bs->open_flags | BDRV_O_RDWR; 2169 source = bs->backing_hd; 2170 if (!source && sync == MIRROR_SYNC_MODE_TOP) { 2171 sync = MIRROR_SYNC_MODE_FULL; 2172 } 2173 if (sync == MIRROR_SYNC_MODE_NONE) { 2174 source = bs; 2175 } 2176 2177 size = bdrv_getlength(bs); 2178 if (size < 0) { 2179 error_setg_errno(errp, -size, "bdrv_getlength failed"); 2180 return; 2181 } 2182 2183 if ((sync == MIRROR_SYNC_MODE_FULL || !source) 2184 && mode != NEW_IMAGE_MODE_EXISTING) 2185 { 2186 /* create new image w/o backing file */ 2187 assert(format && drv); 2188 bdrv_img_create(target, format, 2189 NULL, NULL, NULL, size, flags, &local_err, false); 2190 } else { 2191 switch (mode) { 2192 case NEW_IMAGE_MODE_EXISTING: 2193 break; 2194 case NEW_IMAGE_MODE_ABSOLUTE_PATHS: 2195 /* create new image with backing file */ 2196 bdrv_img_create(target, format, 2197 source->filename, 2198 source->drv->format_name, 2199 NULL, size, flags, &local_err, false); 2200 break; 2201 default: 2202 abort(); 2203 } 2204 } 2205 2206 if (local_err) { 2207 error_propagate(errp, local_err); 2208 return; 2209 } 2210 2211 /* Mirroring takes care of copy-on-write using the source's backing 2212 * file. 2213 */ 2214 target_bs = NULL; 2215 ret = bdrv_open(&target_bs, target, NULL, NULL, flags | BDRV_O_NO_BACKING, 2216 drv, &local_err); 2217 if (ret < 0) { 2218 error_propagate(errp, local_err); 2219 return; 2220 } 2221 2222 mirror_start(bs, target_bs, speed, granularity, buf_size, sync, 2223 on_source_error, on_target_error, 2224 block_job_cb, bs, &local_err); 2225 if (local_err != NULL) { 2226 bdrv_unref(target_bs); 2227 error_propagate(errp, local_err); 2228 return; 2229 } 2230 } 2231 2232 static BlockJob *find_block_job(const char *device) 2233 { 2234 BlockDriverState *bs; 2235 2236 bs = bdrv_find(device); 2237 if (!bs || !bs->job) { 2238 return NULL; 2239 } 2240 return bs->job; 2241 } 2242 2243 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp) 2244 { 2245 BlockJob *job = find_block_job(device); 2246 2247 if (!job) { 2248 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2249 return; 2250 } 2251 2252 block_job_set_speed(job, speed, errp); 2253 } 2254 2255 void qmp_block_job_cancel(const char *device, 2256 bool has_force, bool force, Error **errp) 2257 { 2258 BlockJob *job = find_block_job(device); 2259 2260 if (!has_force) { 2261 force = false; 2262 } 2263 2264 if (!job) { 2265 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2266 return; 2267 } 2268 if (job->paused && !force) { 2269 error_setg(errp, "The block job for device '%s' is currently paused", 2270 device); 2271 return; 2272 } 2273 2274 trace_qmp_block_job_cancel(job); 2275 block_job_cancel(job); 2276 } 2277 2278 void qmp_block_job_pause(const char *device, Error **errp) 2279 { 2280 BlockJob *job = find_block_job(device); 2281 2282 if (!job) { 2283 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2284 return; 2285 } 2286 2287 trace_qmp_block_job_pause(job); 2288 block_job_pause(job); 2289 } 2290 2291 void qmp_block_job_resume(const char *device, Error **errp) 2292 { 2293 BlockJob *job = find_block_job(device); 2294 2295 if (!job) { 2296 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2297 return; 2298 } 2299 2300 trace_qmp_block_job_resume(job); 2301 block_job_resume(job); 2302 } 2303 2304 void qmp_block_job_complete(const char *device, Error **errp) 2305 { 2306 BlockJob *job = find_block_job(device); 2307 2308 if (!job) { 2309 error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device); 2310 return; 2311 } 2312 2313 trace_qmp_block_job_complete(job); 2314 block_job_complete(job, errp); 2315 } 2316 2317 void qmp_blockdev_add(BlockdevOptions *options, Error **errp) 2318 { 2319 QmpOutputVisitor *ov = qmp_output_visitor_new(); 2320 DriveInfo *dinfo; 2321 QObject *obj; 2322 QDict *qdict; 2323 Error *local_err = NULL; 2324 2325 /* Require an ID in the top level */ 2326 if (!options->has_id) { 2327 error_setg(errp, "Block device needs an ID"); 2328 goto fail; 2329 } 2330 2331 /* TODO Sort it out in raw-posix and drive_new(): Reject aio=native with 2332 * cache.direct=false instead of silently switching to aio=threads, except 2333 * when called from drive_new(). 2334 * 2335 * For now, simply forbidding the combination for all drivers will do. */ 2336 if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) { 2337 bool direct = options->has_cache && 2338 options->cache->has_direct && 2339 options->cache->direct; 2340 if (!direct) { 2341 error_setg(errp, "aio=native requires cache.direct=true"); 2342 goto fail; 2343 } 2344 } 2345 2346 visit_type_BlockdevOptions(qmp_output_get_visitor(ov), 2347 &options, NULL, &local_err); 2348 if (local_err) { 2349 error_propagate(errp, local_err); 2350 goto fail; 2351 } 2352 2353 obj = qmp_output_get_qobject(ov); 2354 qdict = qobject_to_qdict(obj); 2355 2356 qdict_flatten(qdict); 2357 2358 dinfo = blockdev_init(NULL, qdict, &local_err); 2359 if (local_err) { 2360 error_propagate(errp, local_err); 2361 goto fail; 2362 } 2363 2364 if (bdrv_key_required(dinfo->bdrv)) { 2365 drive_del(dinfo); 2366 error_setg(errp, "blockdev-add doesn't support encrypted devices"); 2367 goto fail; 2368 } 2369 2370 fail: 2371 qmp_output_visitor_cleanup(ov); 2372 } 2373 2374 static void do_qmp_query_block_jobs_one(void *opaque, BlockDriverState *bs) 2375 { 2376 BlockJobInfoList **prev = opaque; 2377 BlockJob *job = bs->job; 2378 2379 if (job) { 2380 BlockJobInfoList *elem = g_new0(BlockJobInfoList, 1); 2381 elem->value = block_job_query(bs->job); 2382 (*prev)->next = elem; 2383 *prev = elem; 2384 } 2385 } 2386 2387 BlockJobInfoList *qmp_query_block_jobs(Error **errp) 2388 { 2389 /* Dummy is a fake list element for holding the head pointer */ 2390 BlockJobInfoList dummy = {}; 2391 BlockJobInfoList *prev = &dummy; 2392 bdrv_iterate(do_qmp_query_block_jobs_one, &prev); 2393 return dummy.next; 2394 } 2395 2396 QemuOptsList qemu_common_drive_opts = { 2397 .name = "drive", 2398 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head), 2399 .desc = { 2400 { 2401 .name = "snapshot", 2402 .type = QEMU_OPT_BOOL, 2403 .help = "enable/disable snapshot mode", 2404 },{ 2405 .name = "discard", 2406 .type = QEMU_OPT_STRING, 2407 .help = "discard operation (ignore/off, unmap/on)", 2408 },{ 2409 .name = "cache.writeback", 2410 .type = QEMU_OPT_BOOL, 2411 .help = "enables writeback mode for any caches", 2412 },{ 2413 .name = "cache.direct", 2414 .type = QEMU_OPT_BOOL, 2415 .help = "enables use of O_DIRECT (bypass the host page cache)", 2416 },{ 2417 .name = "cache.no-flush", 2418 .type = QEMU_OPT_BOOL, 2419 .help = "ignore any flush requests for the device", 2420 },{ 2421 .name = "aio", 2422 .type = QEMU_OPT_STRING, 2423 .help = "host AIO implementation (threads, native)", 2424 },{ 2425 .name = "format", 2426 .type = QEMU_OPT_STRING, 2427 .help = "disk format (raw, qcow2, ...)", 2428 },{ 2429 .name = "rerror", 2430 .type = QEMU_OPT_STRING, 2431 .help = "read error action", 2432 },{ 2433 .name = "werror", 2434 .type = QEMU_OPT_STRING, 2435 .help = "write error action", 2436 },{ 2437 .name = "read-only", 2438 .type = QEMU_OPT_BOOL, 2439 .help = "open drive file as read-only", 2440 },{ 2441 .name = "throttling.iops-total", 2442 .type = QEMU_OPT_NUMBER, 2443 .help = "limit total I/O operations per second", 2444 },{ 2445 .name = "throttling.iops-read", 2446 .type = QEMU_OPT_NUMBER, 2447 .help = "limit read operations per second", 2448 },{ 2449 .name = "throttling.iops-write", 2450 .type = QEMU_OPT_NUMBER, 2451 .help = "limit write operations per second", 2452 },{ 2453 .name = "throttling.bps-total", 2454 .type = QEMU_OPT_NUMBER, 2455 .help = "limit total bytes per second", 2456 },{ 2457 .name = "throttling.bps-read", 2458 .type = QEMU_OPT_NUMBER, 2459 .help = "limit read bytes per second", 2460 },{ 2461 .name = "throttling.bps-write", 2462 .type = QEMU_OPT_NUMBER, 2463 .help = "limit write bytes per second", 2464 },{ 2465 .name = "throttling.iops-total-max", 2466 .type = QEMU_OPT_NUMBER, 2467 .help = "I/O operations burst", 2468 },{ 2469 .name = "throttling.iops-read-max", 2470 .type = QEMU_OPT_NUMBER, 2471 .help = "I/O operations read burst", 2472 },{ 2473 .name = "throttling.iops-write-max", 2474 .type = QEMU_OPT_NUMBER, 2475 .help = "I/O operations write burst", 2476 },{ 2477 .name = "throttling.bps-total-max", 2478 .type = QEMU_OPT_NUMBER, 2479 .help = "total bytes burst", 2480 },{ 2481 .name = "throttling.bps-read-max", 2482 .type = QEMU_OPT_NUMBER, 2483 .help = "total bytes read burst", 2484 },{ 2485 .name = "throttling.bps-write-max", 2486 .type = QEMU_OPT_NUMBER, 2487 .help = "total bytes write burst", 2488 },{ 2489 .name = "throttling.iops-size", 2490 .type = QEMU_OPT_NUMBER, 2491 .help = "when limiting by iops max size of an I/O in bytes", 2492 },{ 2493 .name = "copy-on-read", 2494 .type = QEMU_OPT_BOOL, 2495 .help = "copy read data from backing file into image file", 2496 },{ 2497 .name = "detect-zeroes", 2498 .type = QEMU_OPT_STRING, 2499 .help = "try to optimize zero writes (off, on, unmap)", 2500 }, 2501 { /* end of list */ } 2502 }, 2503 }; 2504 2505 QemuOptsList qemu_drive_opts = { 2506 .name = "drive", 2507 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head), 2508 .desc = { 2509 /* 2510 * no elements => accept any params 2511 * validation will happen later 2512 */ 2513 { /* end of list */ } 2514 }, 2515 }; 2516