1 /* 2 * QEMU System Emulator block driver 3 * 4 * Copyright (c) 2003 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 #include "config-host.h" 25 #include "qemu-common.h" 26 #include "monitor.h" 27 #include "block_int.h" 28 #include "module.h" 29 #include "qemu-objects.h" 30 31 #ifdef CONFIG_BSD 32 #include <sys/types.h> 33 #include <sys/stat.h> 34 #include <sys/ioctl.h> 35 #include <sys/queue.h> 36 #ifndef __DragonFly__ 37 #include <sys/disk.h> 38 #endif 39 #endif 40 41 #ifdef _WIN32 42 #include <windows.h> 43 #endif 44 45 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, 46 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 47 BlockDriverCompletionFunc *cb, void *opaque); 48 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, 49 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 50 BlockDriverCompletionFunc *cb, void *opaque); 51 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, 52 BlockDriverCompletionFunc *cb, void *opaque); 53 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, 54 uint8_t *buf, int nb_sectors); 55 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, 56 const uint8_t *buf, int nb_sectors); 57 static BlockDriver *find_protocol(const char *filename); 58 59 static QTAILQ_HEAD(, BlockDriverState) bdrv_states = 60 QTAILQ_HEAD_INITIALIZER(bdrv_states); 61 62 static QLIST_HEAD(, BlockDriver) bdrv_drivers = 63 QLIST_HEAD_INITIALIZER(bdrv_drivers); 64 65 /* If non-zero, use only whitelisted block drivers */ 66 static int use_bdrv_whitelist; 67 68 int path_is_absolute(const char *path) 69 { 70 const char *p; 71 #ifdef _WIN32 72 /* specific case for names like: "\\.\d:" */ 73 if (*path == '/' || *path == '\\') 74 return 1; 75 #endif 76 p = strchr(path, ':'); 77 if (p) 78 p++; 79 else 80 p = path; 81 #ifdef _WIN32 82 return (*p == '/' || *p == '\\'); 83 #else 84 return (*p == '/'); 85 #endif 86 } 87 88 /* if filename is absolute, just copy it to dest. Otherwise, build a 89 path to it by considering it is relative to base_path. URL are 90 supported. */ 91 void path_combine(char *dest, int dest_size, 92 const char *base_path, 93 const char *filename) 94 { 95 const char *p, *p1; 96 int len; 97 98 if (dest_size <= 0) 99 return; 100 if (path_is_absolute(filename)) { 101 pstrcpy(dest, dest_size, filename); 102 } else { 103 p = strchr(base_path, ':'); 104 if (p) 105 p++; 106 else 107 p = base_path; 108 p1 = strrchr(base_path, '/'); 109 #ifdef _WIN32 110 { 111 const char *p2; 112 p2 = strrchr(base_path, '\\'); 113 if (!p1 || p2 > p1) 114 p1 = p2; 115 } 116 #endif 117 if (p1) 118 p1++; 119 else 120 p1 = base_path; 121 if (p1 > p) 122 p = p1; 123 len = p - base_path; 124 if (len > dest_size - 1) 125 len = dest_size - 1; 126 memcpy(dest, base_path, len); 127 dest[len] = '\0'; 128 pstrcat(dest, dest_size, filename); 129 } 130 } 131 132 void bdrv_register(BlockDriver *bdrv) 133 { 134 if (!bdrv->bdrv_aio_readv) { 135 /* add AIO emulation layer */ 136 bdrv->bdrv_aio_readv = bdrv_aio_readv_em; 137 bdrv->bdrv_aio_writev = bdrv_aio_writev_em; 138 } else if (!bdrv->bdrv_read) { 139 /* add synchronous IO emulation layer */ 140 bdrv->bdrv_read = bdrv_read_em; 141 bdrv->bdrv_write = bdrv_write_em; 142 } 143 144 if (!bdrv->bdrv_aio_flush) 145 bdrv->bdrv_aio_flush = bdrv_aio_flush_em; 146 147 QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); 148 } 149 150 /* create a new block device (by default it is empty) */ 151 BlockDriverState *bdrv_new(const char *device_name) 152 { 153 BlockDriverState *bs; 154 155 bs = qemu_mallocz(sizeof(BlockDriverState)); 156 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); 157 if (device_name[0] != '\0') { 158 QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); 159 } 160 return bs; 161 } 162 163 BlockDriver *bdrv_find_format(const char *format_name) 164 { 165 BlockDriver *drv1; 166 QLIST_FOREACH(drv1, &bdrv_drivers, list) { 167 if (!strcmp(drv1->format_name, format_name)) { 168 return drv1; 169 } 170 } 171 return NULL; 172 } 173 174 static int bdrv_is_whitelisted(BlockDriver *drv) 175 { 176 static const char *whitelist[] = { 177 CONFIG_BDRV_WHITELIST 178 }; 179 const char **p; 180 181 if (!whitelist[0]) 182 return 1; /* no whitelist, anything goes */ 183 184 for (p = whitelist; *p; p++) { 185 if (!strcmp(drv->format_name, *p)) { 186 return 1; 187 } 188 } 189 return 0; 190 } 191 192 BlockDriver *bdrv_find_whitelisted_format(const char *format_name) 193 { 194 BlockDriver *drv = bdrv_find_format(format_name); 195 return drv && bdrv_is_whitelisted(drv) ? drv : NULL; 196 } 197 198 int bdrv_create(BlockDriver *drv, const char* filename, 199 QEMUOptionParameter *options) 200 { 201 if (!drv->bdrv_create) 202 return -ENOTSUP; 203 204 return drv->bdrv_create(filename, options); 205 } 206 207 int bdrv_create_file(const char* filename, QEMUOptionParameter *options) 208 { 209 BlockDriver *drv; 210 211 drv = find_protocol(filename); 212 if (drv == NULL) { 213 drv = bdrv_find_format("file"); 214 } 215 216 return bdrv_create(drv, filename, options); 217 } 218 219 #ifdef _WIN32 220 void get_tmp_filename(char *filename, int size) 221 { 222 char temp_dir[MAX_PATH]; 223 224 GetTempPath(MAX_PATH, temp_dir); 225 GetTempFileName(temp_dir, "qem", 0, filename); 226 } 227 #else 228 void get_tmp_filename(char *filename, int size) 229 { 230 int fd; 231 const char *tmpdir; 232 /* XXX: race condition possible */ 233 tmpdir = getenv("TMPDIR"); 234 if (!tmpdir) 235 tmpdir = "/tmp"; 236 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); 237 fd = mkstemp(filename); 238 close(fd); 239 } 240 #endif 241 242 #ifdef _WIN32 243 static int is_windows_drive_prefix(const char *filename) 244 { 245 return (((filename[0] >= 'a' && filename[0] <= 'z') || 246 (filename[0] >= 'A' && filename[0] <= 'Z')) && 247 filename[1] == ':'); 248 } 249 250 int is_windows_drive(const char *filename) 251 { 252 if (is_windows_drive_prefix(filename) && 253 filename[2] == '\0') 254 return 1; 255 if (strstart(filename, "\\\\.\\", NULL) || 256 strstart(filename, "//./", NULL)) 257 return 1; 258 return 0; 259 } 260 #endif 261 262 /* 263 * Detect host devices. By convention, /dev/cdrom[N] is always 264 * recognized as a host CDROM. 265 */ 266 static BlockDriver *find_hdev_driver(const char *filename) 267 { 268 int score_max = 0, score; 269 BlockDriver *drv = NULL, *d; 270 271 QLIST_FOREACH(d, &bdrv_drivers, list) { 272 if (d->bdrv_probe_device) { 273 score = d->bdrv_probe_device(filename); 274 if (score > score_max) { 275 score_max = score; 276 drv = d; 277 } 278 } 279 } 280 281 return drv; 282 } 283 284 static BlockDriver *find_protocol(const char *filename) 285 { 286 BlockDriver *drv1; 287 char protocol[128]; 288 int len; 289 const char *p; 290 291 /* TODO Drivers without bdrv_file_open must be specified explicitly */ 292 293 #ifdef _WIN32 294 if (is_windows_drive(filename) || 295 is_windows_drive_prefix(filename)) 296 return bdrv_find_format("file"); 297 #endif 298 p = strchr(filename, ':'); 299 if (!p) { 300 drv1 = find_hdev_driver(filename); 301 if (!drv1) { 302 drv1 = bdrv_find_format("file"); 303 } 304 return drv1; 305 } 306 len = p - filename; 307 if (len > sizeof(protocol) - 1) 308 len = sizeof(protocol) - 1; 309 memcpy(protocol, filename, len); 310 protocol[len] = '\0'; 311 QLIST_FOREACH(drv1, &bdrv_drivers, list) { 312 if (drv1->protocol_name && 313 !strcmp(drv1->protocol_name, protocol)) { 314 return drv1; 315 } 316 } 317 return NULL; 318 } 319 320 static BlockDriver *find_image_format(const char *filename) 321 { 322 int ret, score, score_max; 323 BlockDriver *drv1, *drv; 324 uint8_t buf[2048]; 325 BlockDriverState *bs; 326 327 drv = find_protocol(filename); 328 /* no need to test disk image formats for vvfat */ 329 if (drv && strcmp(drv->format_name, "vvfat") == 0) 330 return drv; 331 332 ret = bdrv_file_open(&bs, filename, 0); 333 if (ret < 0) 334 return NULL; 335 ret = bdrv_pread(bs, 0, buf, sizeof(buf)); 336 bdrv_delete(bs); 337 if (ret < 0) { 338 return NULL; 339 } 340 341 score_max = 0; 342 drv = NULL; 343 QLIST_FOREACH(drv1, &bdrv_drivers, list) { 344 if (drv1->bdrv_probe) { 345 score = drv1->bdrv_probe(buf, ret, filename); 346 if (score > score_max) { 347 score_max = score; 348 drv = drv1; 349 } 350 } 351 } 352 return drv; 353 } 354 355 /* 356 * Common part for opening disk images and files 357 */ 358 static int bdrv_open_common(BlockDriverState *bs, const char *filename, 359 int flags, BlockDriver *drv) 360 { 361 int ret, open_flags; 362 363 assert(drv != NULL); 364 365 bs->file = NULL; 366 bs->is_temporary = 0; 367 bs->encrypted = 0; 368 bs->valid_key = 0; 369 bs->open_flags = flags; 370 /* buffer_alignment defaulted to 512, drivers can change this value */ 371 bs->buffer_alignment = 512; 372 373 pstrcpy(bs->filename, sizeof(bs->filename), filename); 374 375 if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { 376 return -ENOTSUP; 377 } 378 379 bs->drv = drv; 380 bs->opaque = qemu_mallocz(drv->instance_size); 381 382 /* 383 * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a 384 * write cache to the guest. We do need the fdatasync to flush 385 * out transactions for block allocations, and we maybe have a 386 * volatile write cache in our backing device to deal with. 387 */ 388 if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) 389 bs->enable_write_cache = 1; 390 391 /* 392 * Clear flags that are internal to the block layer before opening the 393 * image. 394 */ 395 open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); 396 397 /* 398 * Snapshots should be writeable. 399 */ 400 if (bs->is_temporary) { 401 open_flags |= BDRV_O_RDWR; 402 } 403 404 /* Open the image, either directly or using a protocol */ 405 if (drv->bdrv_file_open) { 406 ret = drv->bdrv_file_open(bs, filename, open_flags); 407 } else { 408 ret = bdrv_file_open(&bs->file, filename, open_flags); 409 if (ret >= 0) { 410 ret = drv->bdrv_open(bs, open_flags); 411 } 412 } 413 414 if (ret < 0) { 415 goto free_and_fail; 416 } 417 418 bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); 419 if (drv->bdrv_getlength) { 420 bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; 421 } 422 #ifndef _WIN32 423 if (bs->is_temporary) { 424 unlink(filename); 425 } 426 #endif 427 return 0; 428 429 free_and_fail: 430 if (bs->file) { 431 bdrv_delete(bs->file); 432 bs->file = NULL; 433 } 434 qemu_free(bs->opaque); 435 bs->opaque = NULL; 436 bs->drv = NULL; 437 return ret; 438 } 439 440 /* 441 * Opens a file using a protocol (file, host_device, nbd, ...) 442 */ 443 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) 444 { 445 BlockDriverState *bs; 446 BlockDriver *drv; 447 int ret; 448 449 drv = find_protocol(filename); 450 if (!drv) { 451 return -ENOENT; 452 } 453 454 bs = bdrv_new(""); 455 ret = bdrv_open_common(bs, filename, flags, drv); 456 if (ret < 0) { 457 bdrv_delete(bs); 458 return ret; 459 } 460 bs->growable = 1; 461 *pbs = bs; 462 return 0; 463 } 464 465 /* 466 * Opens a disk image (raw, qcow2, vmdk, ...) 467 */ 468 int bdrv_open(BlockDriverState *bs, const char *filename, int flags, 469 BlockDriver *drv) 470 { 471 int ret; 472 473 if (flags & BDRV_O_SNAPSHOT) { 474 BlockDriverState *bs1; 475 int64_t total_size; 476 int is_protocol = 0; 477 BlockDriver *bdrv_qcow2; 478 QEMUOptionParameter *options; 479 char tmp_filename[PATH_MAX]; 480 char backing_filename[PATH_MAX]; 481 482 /* if snapshot, we create a temporary backing file and open it 483 instead of opening 'filename' directly */ 484 485 /* if there is a backing file, use it */ 486 bs1 = bdrv_new(""); 487 ret = bdrv_open(bs1, filename, 0, drv); 488 if (ret < 0) { 489 bdrv_delete(bs1); 490 return ret; 491 } 492 total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; 493 494 if (bs1->drv && bs1->drv->protocol_name) 495 is_protocol = 1; 496 497 bdrv_delete(bs1); 498 499 get_tmp_filename(tmp_filename, sizeof(tmp_filename)); 500 501 /* Real path is meaningless for protocols */ 502 if (is_protocol) 503 snprintf(backing_filename, sizeof(backing_filename), 504 "%s", filename); 505 else if (!realpath(filename, backing_filename)) 506 return -errno; 507 508 bdrv_qcow2 = bdrv_find_format("qcow2"); 509 options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); 510 511 set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); 512 set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); 513 if (drv) { 514 set_option_parameter(options, BLOCK_OPT_BACKING_FMT, 515 drv->format_name); 516 } 517 518 ret = bdrv_create(bdrv_qcow2, tmp_filename, options); 519 if (ret < 0) { 520 return ret; 521 } 522 523 filename = tmp_filename; 524 drv = bdrv_qcow2; 525 bs->is_temporary = 1; 526 } 527 528 /* Find the right image format driver */ 529 if (!drv) { 530 drv = find_image_format(filename); 531 } 532 533 if (!drv) { 534 ret = -ENOENT; 535 goto unlink_and_fail; 536 } 537 538 /* Open the image */ 539 ret = bdrv_open_common(bs, filename, flags, drv); 540 if (ret < 0) { 541 goto unlink_and_fail; 542 } 543 544 /* If there is a backing file, use it */ 545 if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { 546 char backing_filename[PATH_MAX]; 547 int back_flags; 548 BlockDriver *back_drv = NULL; 549 550 bs->backing_hd = bdrv_new(""); 551 path_combine(backing_filename, sizeof(backing_filename), 552 filename, bs->backing_file); 553 if (bs->backing_format[0] != '\0') 554 back_drv = bdrv_find_format(bs->backing_format); 555 556 /* backing files always opened read-only */ 557 back_flags = 558 flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); 559 560 ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); 561 if (ret < 0) { 562 bdrv_close(bs); 563 return ret; 564 } 565 if (bs->is_temporary) { 566 bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); 567 } else { 568 /* base image inherits from "parent" */ 569 bs->backing_hd->keep_read_only = bs->keep_read_only; 570 } 571 } 572 573 if (!bdrv_key_required(bs)) { 574 /* call the change callback */ 575 bs->media_changed = 1; 576 if (bs->change_cb) 577 bs->change_cb(bs->change_opaque); 578 } 579 580 return 0; 581 582 unlink_and_fail: 583 if (bs->is_temporary) { 584 unlink(filename); 585 } 586 return ret; 587 } 588 589 void bdrv_close(BlockDriverState *bs) 590 { 591 if (bs->drv) { 592 if (bs->backing_hd) 593 bdrv_delete(bs->backing_hd); 594 bs->drv->bdrv_close(bs); 595 qemu_free(bs->opaque); 596 #ifdef _WIN32 597 if (bs->is_temporary) { 598 unlink(bs->filename); 599 } 600 #endif 601 bs->opaque = NULL; 602 bs->drv = NULL; 603 604 if (bs->file != NULL) { 605 bdrv_close(bs->file); 606 } 607 608 /* call the change callback */ 609 bs->media_changed = 1; 610 if (bs->change_cb) 611 bs->change_cb(bs->change_opaque); 612 } 613 } 614 615 void bdrv_delete(BlockDriverState *bs) 616 { 617 /* remove from list, if necessary */ 618 if (bs->device_name[0] != '\0') { 619 QTAILQ_REMOVE(&bdrv_states, bs, list); 620 } 621 622 bdrv_close(bs); 623 if (bs->file != NULL) { 624 bdrv_delete(bs->file); 625 } 626 627 qemu_free(bs); 628 } 629 630 /* 631 * Run consistency checks on an image 632 * 633 * Returns the number of errors or -errno when an internal error occurs 634 */ 635 int bdrv_check(BlockDriverState *bs) 636 { 637 if (bs->drv->bdrv_check == NULL) { 638 return -ENOTSUP; 639 } 640 641 return bs->drv->bdrv_check(bs); 642 } 643 644 /* commit COW file into the raw image */ 645 int bdrv_commit(BlockDriverState *bs) 646 { 647 BlockDriver *drv = bs->drv; 648 int64_t i, total_sectors; 649 int n, j, ro, open_flags; 650 int ret = 0, rw_ret = 0; 651 unsigned char sector[512]; 652 char filename[1024]; 653 BlockDriverState *bs_rw, *bs_ro; 654 655 if (!drv) 656 return -ENOMEDIUM; 657 658 if (!bs->backing_hd) { 659 return -ENOTSUP; 660 } 661 662 if (bs->backing_hd->keep_read_only) { 663 return -EACCES; 664 } 665 666 ro = bs->backing_hd->read_only; 667 strncpy(filename, bs->backing_hd->filename, sizeof(filename)); 668 open_flags = bs->backing_hd->open_flags; 669 670 if (ro) { 671 /* re-open as RW */ 672 bdrv_delete(bs->backing_hd); 673 bs->backing_hd = NULL; 674 bs_rw = bdrv_new(""); 675 rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, NULL); 676 if (rw_ret < 0) { 677 bdrv_delete(bs_rw); 678 /* try to re-open read-only */ 679 bs_ro = bdrv_new(""); 680 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL); 681 if (ret < 0) { 682 bdrv_delete(bs_ro); 683 /* drive not functional anymore */ 684 bs->drv = NULL; 685 return ret; 686 } 687 bs->backing_hd = bs_ro; 688 return rw_ret; 689 } 690 bs->backing_hd = bs_rw; 691 } 692 693 total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; 694 for (i = 0; i < total_sectors;) { 695 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { 696 for(j = 0; j < n; j++) { 697 if (bdrv_read(bs, i, sector, 1) != 0) { 698 ret = -EIO; 699 goto ro_cleanup; 700 } 701 702 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { 703 ret = -EIO; 704 goto ro_cleanup; 705 } 706 i++; 707 } 708 } else { 709 i += n; 710 } 711 } 712 713 if (drv->bdrv_make_empty) { 714 ret = drv->bdrv_make_empty(bs); 715 bdrv_flush(bs); 716 } 717 718 /* 719 * Make sure all data we wrote to the backing device is actually 720 * stable on disk. 721 */ 722 if (bs->backing_hd) 723 bdrv_flush(bs->backing_hd); 724 725 ro_cleanup: 726 727 if (ro) { 728 /* re-open as RO */ 729 bdrv_delete(bs->backing_hd); 730 bs->backing_hd = NULL; 731 bs_ro = bdrv_new(""); 732 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL); 733 if (ret < 0) { 734 bdrv_delete(bs_ro); 735 /* drive not functional anymore */ 736 bs->drv = NULL; 737 return ret; 738 } 739 bs->backing_hd = bs_ro; 740 bs->backing_hd->keep_read_only = 0; 741 } 742 743 return ret; 744 } 745 746 /* 747 * Return values: 748 * 0 - success 749 * -EINVAL - backing format specified, but no file 750 * -ENOSPC - can't update the backing file because no space is left in the 751 * image file header 752 * -ENOTSUP - format driver doesn't support changing the backing file 753 */ 754 int bdrv_change_backing_file(BlockDriverState *bs, 755 const char *backing_file, const char *backing_fmt) 756 { 757 BlockDriver *drv = bs->drv; 758 759 if (drv->bdrv_change_backing_file != NULL) { 760 return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); 761 } else { 762 return -ENOTSUP; 763 } 764 } 765 766 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, 767 size_t size) 768 { 769 int64_t len; 770 771 if (!bdrv_is_inserted(bs)) 772 return -ENOMEDIUM; 773 774 if (bs->growable) 775 return 0; 776 777 len = bdrv_getlength(bs); 778 779 if (offset < 0) 780 return -EIO; 781 782 if ((offset > len) || (len - offset < size)) 783 return -EIO; 784 785 return 0; 786 } 787 788 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, 789 int nb_sectors) 790 { 791 return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); 792 } 793 794 /* return < 0 if error. See bdrv_write() for the return codes */ 795 int bdrv_read(BlockDriverState *bs, int64_t sector_num, 796 uint8_t *buf, int nb_sectors) 797 { 798 BlockDriver *drv = bs->drv; 799 800 if (!drv) 801 return -ENOMEDIUM; 802 if (bdrv_check_request(bs, sector_num, nb_sectors)) 803 return -EIO; 804 805 return drv->bdrv_read(bs, sector_num, buf, nb_sectors); 806 } 807 808 static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, 809 int nb_sectors, int dirty) 810 { 811 int64_t start, end; 812 unsigned long val, idx, bit; 813 814 start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; 815 end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; 816 817 for (; start <= end; start++) { 818 idx = start / (sizeof(unsigned long) * 8); 819 bit = start % (sizeof(unsigned long) * 8); 820 val = bs->dirty_bitmap[idx]; 821 if (dirty) { 822 if (!(val & (1 << bit))) { 823 bs->dirty_count++; 824 val |= 1 << bit; 825 } 826 } else { 827 if (val & (1 << bit)) { 828 bs->dirty_count--; 829 val &= ~(1 << bit); 830 } 831 } 832 bs->dirty_bitmap[idx] = val; 833 } 834 } 835 836 /* Return < 0 if error. Important errors are: 837 -EIO generic I/O error (may happen for all errors) 838 -ENOMEDIUM No media inserted. 839 -EINVAL Invalid sector number or nb_sectors 840 -EACCES Trying to write a read-only device 841 */ 842 int bdrv_write(BlockDriverState *bs, int64_t sector_num, 843 const uint8_t *buf, int nb_sectors) 844 { 845 BlockDriver *drv = bs->drv; 846 if (!bs->drv) 847 return -ENOMEDIUM; 848 if (bs->read_only) 849 return -EACCES; 850 if (bdrv_check_request(bs, sector_num, nb_sectors)) 851 return -EIO; 852 853 if (bs->dirty_bitmap) { 854 set_dirty_bitmap(bs, sector_num, nb_sectors, 1); 855 } 856 857 return drv->bdrv_write(bs, sector_num, buf, nb_sectors); 858 } 859 860 int bdrv_pread(BlockDriverState *bs, int64_t offset, 861 void *buf, int count1) 862 { 863 uint8_t tmp_buf[BDRV_SECTOR_SIZE]; 864 int len, nb_sectors, count; 865 int64_t sector_num; 866 int ret; 867 868 count = count1; 869 /* first read to align to sector start */ 870 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); 871 if (len > count) 872 len = count; 873 sector_num = offset >> BDRV_SECTOR_BITS; 874 if (len > 0) { 875 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) 876 return ret; 877 memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); 878 count -= len; 879 if (count == 0) 880 return count1; 881 sector_num++; 882 buf += len; 883 } 884 885 /* read the sectors "in place" */ 886 nb_sectors = count >> BDRV_SECTOR_BITS; 887 if (nb_sectors > 0) { 888 if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) 889 return ret; 890 sector_num += nb_sectors; 891 len = nb_sectors << BDRV_SECTOR_BITS; 892 buf += len; 893 count -= len; 894 } 895 896 /* add data from the last sector */ 897 if (count > 0) { 898 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) 899 return ret; 900 memcpy(buf, tmp_buf, count); 901 } 902 return count1; 903 } 904 905 int bdrv_pwrite(BlockDriverState *bs, int64_t offset, 906 const void *buf, int count1) 907 { 908 uint8_t tmp_buf[BDRV_SECTOR_SIZE]; 909 int len, nb_sectors, count; 910 int64_t sector_num; 911 int ret; 912 913 count = count1; 914 /* first write to align to sector start */ 915 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); 916 if (len > count) 917 len = count; 918 sector_num = offset >> BDRV_SECTOR_BITS; 919 if (len > 0) { 920 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) 921 return ret; 922 memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); 923 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) 924 return ret; 925 count -= len; 926 if (count == 0) 927 return count1; 928 sector_num++; 929 buf += len; 930 } 931 932 /* write the sectors "in place" */ 933 nb_sectors = count >> BDRV_SECTOR_BITS; 934 if (nb_sectors > 0) { 935 if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) 936 return ret; 937 sector_num += nb_sectors; 938 len = nb_sectors << BDRV_SECTOR_BITS; 939 buf += len; 940 count -= len; 941 } 942 943 /* add data from the last sector */ 944 if (count > 0) { 945 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) 946 return ret; 947 memcpy(tmp_buf, buf, count); 948 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) 949 return ret; 950 } 951 return count1; 952 } 953 954 /** 955 * Truncate file to 'offset' bytes (needed only for file protocols) 956 */ 957 int bdrv_truncate(BlockDriverState *bs, int64_t offset) 958 { 959 BlockDriver *drv = bs->drv; 960 if (!drv) 961 return -ENOMEDIUM; 962 if (!drv->bdrv_truncate) 963 return -ENOTSUP; 964 if (bs->read_only) 965 return -EACCES; 966 return drv->bdrv_truncate(bs, offset); 967 } 968 969 /** 970 * Length of a file in bytes. Return < 0 if error or unknown. 971 */ 972 int64_t bdrv_getlength(BlockDriverState *bs) 973 { 974 BlockDriver *drv = bs->drv; 975 if (!drv) 976 return -ENOMEDIUM; 977 if (!drv->bdrv_getlength) { 978 /* legacy mode */ 979 return bs->total_sectors * BDRV_SECTOR_SIZE; 980 } 981 return drv->bdrv_getlength(bs); 982 } 983 984 /* return 0 as number of sectors if no device present or error */ 985 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) 986 { 987 int64_t length; 988 length = bdrv_getlength(bs); 989 if (length < 0) 990 length = 0; 991 else 992 length = length >> BDRV_SECTOR_BITS; 993 *nb_sectors_ptr = length; 994 } 995 996 struct partition { 997 uint8_t boot_ind; /* 0x80 - active */ 998 uint8_t head; /* starting head */ 999 uint8_t sector; /* starting sector */ 1000 uint8_t cyl; /* starting cylinder */ 1001 uint8_t sys_ind; /* What partition type */ 1002 uint8_t end_head; /* end head */ 1003 uint8_t end_sector; /* end sector */ 1004 uint8_t end_cyl; /* end cylinder */ 1005 uint32_t start_sect; /* starting sector counting from 0 */ 1006 uint32_t nr_sects; /* nr of sectors in partition */ 1007 } __attribute__((packed)); 1008 1009 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ 1010 static int guess_disk_lchs(BlockDriverState *bs, 1011 int *pcylinders, int *pheads, int *psectors) 1012 { 1013 uint8_t buf[512]; 1014 int ret, i, heads, sectors, cylinders; 1015 struct partition *p; 1016 uint32_t nr_sects; 1017 uint64_t nb_sectors; 1018 1019 bdrv_get_geometry(bs, &nb_sectors); 1020 1021 ret = bdrv_read(bs, 0, buf, 1); 1022 if (ret < 0) 1023 return -1; 1024 /* test msdos magic */ 1025 if (buf[510] != 0x55 || buf[511] != 0xaa) 1026 return -1; 1027 for(i = 0; i < 4; i++) { 1028 p = ((struct partition *)(buf + 0x1be)) + i; 1029 nr_sects = le32_to_cpu(p->nr_sects); 1030 if (nr_sects && p->end_head) { 1031 /* We make the assumption that the partition terminates on 1032 a cylinder boundary */ 1033 heads = p->end_head + 1; 1034 sectors = p->end_sector & 63; 1035 if (sectors == 0) 1036 continue; 1037 cylinders = nb_sectors / (heads * sectors); 1038 if (cylinders < 1 || cylinders > 16383) 1039 continue; 1040 *pheads = heads; 1041 *psectors = sectors; 1042 *pcylinders = cylinders; 1043 #if 0 1044 printf("guessed geometry: LCHS=%d %d %d\n", 1045 cylinders, heads, sectors); 1046 #endif 1047 return 0; 1048 } 1049 } 1050 return -1; 1051 } 1052 1053 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) 1054 { 1055 int translation, lba_detected = 0; 1056 int cylinders, heads, secs; 1057 uint64_t nb_sectors; 1058 1059 /* if a geometry hint is available, use it */ 1060 bdrv_get_geometry(bs, &nb_sectors); 1061 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); 1062 translation = bdrv_get_translation_hint(bs); 1063 if (cylinders != 0) { 1064 *pcyls = cylinders; 1065 *pheads = heads; 1066 *psecs = secs; 1067 } else { 1068 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { 1069 if (heads > 16) { 1070 /* if heads > 16, it means that a BIOS LBA 1071 translation was active, so the default 1072 hardware geometry is OK */ 1073 lba_detected = 1; 1074 goto default_geometry; 1075 } else { 1076 *pcyls = cylinders; 1077 *pheads = heads; 1078 *psecs = secs; 1079 /* disable any translation to be in sync with 1080 the logical geometry */ 1081 if (translation == BIOS_ATA_TRANSLATION_AUTO) { 1082 bdrv_set_translation_hint(bs, 1083 BIOS_ATA_TRANSLATION_NONE); 1084 } 1085 } 1086 } else { 1087 default_geometry: 1088 /* if no geometry, use a standard physical disk geometry */ 1089 cylinders = nb_sectors / (16 * 63); 1090 1091 if (cylinders > 16383) 1092 cylinders = 16383; 1093 else if (cylinders < 2) 1094 cylinders = 2; 1095 *pcyls = cylinders; 1096 *pheads = 16; 1097 *psecs = 63; 1098 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { 1099 if ((*pcyls * *pheads) <= 131072) { 1100 bdrv_set_translation_hint(bs, 1101 BIOS_ATA_TRANSLATION_LARGE); 1102 } else { 1103 bdrv_set_translation_hint(bs, 1104 BIOS_ATA_TRANSLATION_LBA); 1105 } 1106 } 1107 } 1108 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); 1109 } 1110 } 1111 1112 void bdrv_set_geometry_hint(BlockDriverState *bs, 1113 int cyls, int heads, int secs) 1114 { 1115 bs->cyls = cyls; 1116 bs->heads = heads; 1117 bs->secs = secs; 1118 } 1119 1120 void bdrv_set_type_hint(BlockDriverState *bs, int type) 1121 { 1122 bs->type = type; 1123 bs->removable = ((type == BDRV_TYPE_CDROM || 1124 type == BDRV_TYPE_FLOPPY)); 1125 } 1126 1127 void bdrv_set_translation_hint(BlockDriverState *bs, int translation) 1128 { 1129 bs->translation = translation; 1130 } 1131 1132 void bdrv_get_geometry_hint(BlockDriverState *bs, 1133 int *pcyls, int *pheads, int *psecs) 1134 { 1135 *pcyls = bs->cyls; 1136 *pheads = bs->heads; 1137 *psecs = bs->secs; 1138 } 1139 1140 int bdrv_get_type_hint(BlockDriverState *bs) 1141 { 1142 return bs->type; 1143 } 1144 1145 int bdrv_get_translation_hint(BlockDriverState *bs) 1146 { 1147 return bs->translation; 1148 } 1149 1150 int bdrv_is_removable(BlockDriverState *bs) 1151 { 1152 return bs->removable; 1153 } 1154 1155 int bdrv_is_read_only(BlockDriverState *bs) 1156 { 1157 return bs->read_only; 1158 } 1159 1160 int bdrv_is_sg(BlockDriverState *bs) 1161 { 1162 return bs->sg; 1163 } 1164 1165 int bdrv_enable_write_cache(BlockDriverState *bs) 1166 { 1167 return bs->enable_write_cache; 1168 } 1169 1170 /* XXX: no longer used */ 1171 void bdrv_set_change_cb(BlockDriverState *bs, 1172 void (*change_cb)(void *opaque), void *opaque) 1173 { 1174 bs->change_cb = change_cb; 1175 bs->change_opaque = opaque; 1176 } 1177 1178 int bdrv_is_encrypted(BlockDriverState *bs) 1179 { 1180 if (bs->backing_hd && bs->backing_hd->encrypted) 1181 return 1; 1182 return bs->encrypted; 1183 } 1184 1185 int bdrv_key_required(BlockDriverState *bs) 1186 { 1187 BlockDriverState *backing_hd = bs->backing_hd; 1188 1189 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) 1190 return 1; 1191 return (bs->encrypted && !bs->valid_key); 1192 } 1193 1194 int bdrv_set_key(BlockDriverState *bs, const char *key) 1195 { 1196 int ret; 1197 if (bs->backing_hd && bs->backing_hd->encrypted) { 1198 ret = bdrv_set_key(bs->backing_hd, key); 1199 if (ret < 0) 1200 return ret; 1201 if (!bs->encrypted) 1202 return 0; 1203 } 1204 if (!bs->encrypted) { 1205 return -EINVAL; 1206 } else if (!bs->drv || !bs->drv->bdrv_set_key) { 1207 return -ENOMEDIUM; 1208 } 1209 ret = bs->drv->bdrv_set_key(bs, key); 1210 if (ret < 0) { 1211 bs->valid_key = 0; 1212 } else if (!bs->valid_key) { 1213 bs->valid_key = 1; 1214 /* call the change callback now, we skipped it on open */ 1215 bs->media_changed = 1; 1216 if (bs->change_cb) 1217 bs->change_cb(bs->change_opaque); 1218 } 1219 return ret; 1220 } 1221 1222 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) 1223 { 1224 if (!bs->drv) { 1225 buf[0] = '\0'; 1226 } else { 1227 pstrcpy(buf, buf_size, bs->drv->format_name); 1228 } 1229 } 1230 1231 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 1232 void *opaque) 1233 { 1234 BlockDriver *drv; 1235 1236 QLIST_FOREACH(drv, &bdrv_drivers, list) { 1237 it(opaque, drv->format_name); 1238 } 1239 } 1240 1241 BlockDriverState *bdrv_find(const char *name) 1242 { 1243 BlockDriverState *bs; 1244 1245 QTAILQ_FOREACH(bs, &bdrv_states, list) { 1246 if (!strcmp(name, bs->device_name)) { 1247 return bs; 1248 } 1249 } 1250 return NULL; 1251 } 1252 1253 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) 1254 { 1255 BlockDriverState *bs; 1256 1257 QTAILQ_FOREACH(bs, &bdrv_states, list) { 1258 it(opaque, bs); 1259 } 1260 } 1261 1262 const char *bdrv_get_device_name(BlockDriverState *bs) 1263 { 1264 return bs->device_name; 1265 } 1266 1267 void bdrv_flush(BlockDriverState *bs) 1268 { 1269 if (bs->drv && bs->drv->bdrv_flush) 1270 bs->drv->bdrv_flush(bs); 1271 } 1272 1273 void bdrv_flush_all(void) 1274 { 1275 BlockDriverState *bs; 1276 1277 QTAILQ_FOREACH(bs, &bdrv_states, list) { 1278 if (bs->drv && !bdrv_is_read_only(bs) && 1279 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { 1280 bdrv_flush(bs); 1281 } 1282 } 1283 } 1284 1285 /* 1286 * Returns true iff the specified sector is present in the disk image. Drivers 1287 * not implementing the functionality are assumed to not support backing files, 1288 * hence all their sectors are reported as allocated. 1289 * 1290 * 'pnum' is set to the number of sectors (including and immediately following 1291 * the specified sector) that are known to be in the same 1292 * allocated/unallocated state. 1293 * 1294 * 'nb_sectors' is the max value 'pnum' should be set to. 1295 */ 1296 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 1297 int *pnum) 1298 { 1299 int64_t n; 1300 if (!bs->drv->bdrv_is_allocated) { 1301 if (sector_num >= bs->total_sectors) { 1302 *pnum = 0; 1303 return 0; 1304 } 1305 n = bs->total_sectors - sector_num; 1306 *pnum = (n < nb_sectors) ? (n) : (nb_sectors); 1307 return 1; 1308 } 1309 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); 1310 } 1311 1312 void bdrv_mon_event(const BlockDriverState *bdrv, 1313 BlockMonEventAction action, int is_read) 1314 { 1315 QObject *data; 1316 const char *action_str; 1317 1318 switch (action) { 1319 case BDRV_ACTION_REPORT: 1320 action_str = "report"; 1321 break; 1322 case BDRV_ACTION_IGNORE: 1323 action_str = "ignore"; 1324 break; 1325 case BDRV_ACTION_STOP: 1326 action_str = "stop"; 1327 break; 1328 default: 1329 abort(); 1330 } 1331 1332 data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", 1333 bdrv->device_name, 1334 action_str, 1335 is_read ? "read" : "write"); 1336 monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); 1337 1338 qobject_decref(data); 1339 } 1340 1341 static void bdrv_print_dict(QObject *obj, void *opaque) 1342 { 1343 QDict *bs_dict; 1344 Monitor *mon = opaque; 1345 1346 bs_dict = qobject_to_qdict(obj); 1347 1348 monitor_printf(mon, "%s: type=%s removable=%d", 1349 qdict_get_str(bs_dict, "device"), 1350 qdict_get_str(bs_dict, "type"), 1351 qdict_get_bool(bs_dict, "removable")); 1352 1353 if (qdict_get_bool(bs_dict, "removable")) { 1354 monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); 1355 } 1356 1357 if (qdict_haskey(bs_dict, "inserted")) { 1358 QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); 1359 1360 monitor_printf(mon, " file="); 1361 monitor_print_filename(mon, qdict_get_str(qdict, "file")); 1362 if (qdict_haskey(qdict, "backing_file")) { 1363 monitor_printf(mon, " backing_file="); 1364 monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); 1365 } 1366 monitor_printf(mon, " ro=%d drv=%s encrypted=%d", 1367 qdict_get_bool(qdict, "ro"), 1368 qdict_get_str(qdict, "drv"), 1369 qdict_get_bool(qdict, "encrypted")); 1370 } else { 1371 monitor_printf(mon, " [not inserted]"); 1372 } 1373 1374 monitor_printf(mon, "\n"); 1375 } 1376 1377 void bdrv_info_print(Monitor *mon, const QObject *data) 1378 { 1379 qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); 1380 } 1381 1382 /** 1383 * bdrv_info(): Block devices information 1384 * 1385 * Each block device information is stored in a QDict and the 1386 * returned QObject is a QList of all devices. 1387 * 1388 * The QDict contains the following: 1389 * 1390 * - "device": device name 1391 * - "type": device type 1392 * - "removable": true if the device is removable, false otherwise 1393 * - "locked": true if the device is locked, false otherwise 1394 * - "inserted": only present if the device is inserted, it is a QDict 1395 * containing the following: 1396 * - "file": device file name 1397 * - "ro": true if read-only, false otherwise 1398 * - "drv": driver format name 1399 * - "backing_file": backing file name if one is used 1400 * - "encrypted": true if encrypted, false otherwise 1401 * 1402 * Example: 1403 * 1404 * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false, 1405 * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } }, 1406 * { "device": "floppy0", "type": "floppy", "removable": true, 1407 * "locked": false } ] 1408 */ 1409 void bdrv_info(Monitor *mon, QObject **ret_data) 1410 { 1411 QList *bs_list; 1412 BlockDriverState *bs; 1413 1414 bs_list = qlist_new(); 1415 1416 QTAILQ_FOREACH(bs, &bdrv_states, list) { 1417 QObject *bs_obj; 1418 const char *type = "unknown"; 1419 1420 switch(bs->type) { 1421 case BDRV_TYPE_HD: 1422 type = "hd"; 1423 break; 1424 case BDRV_TYPE_CDROM: 1425 type = "cdrom"; 1426 break; 1427 case BDRV_TYPE_FLOPPY: 1428 type = "floppy"; 1429 break; 1430 } 1431 1432 bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " 1433 "'removable': %i, 'locked': %i }", 1434 bs->device_name, type, bs->removable, 1435 bs->locked); 1436 1437 if (bs->drv) { 1438 QObject *obj; 1439 QDict *bs_dict = qobject_to_qdict(bs_obj); 1440 1441 obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " 1442 "'encrypted': %i }", 1443 bs->filename, bs->read_only, 1444 bs->drv->format_name, 1445 bdrv_is_encrypted(bs)); 1446 if (bs->backing_file[0] != '\0') { 1447 QDict *qdict = qobject_to_qdict(obj); 1448 qdict_put(qdict, "backing_file", 1449 qstring_from_str(bs->backing_file)); 1450 } 1451 1452 qdict_put_obj(bs_dict, "inserted", obj); 1453 } 1454 qlist_append_obj(bs_list, bs_obj); 1455 } 1456 1457 *ret_data = QOBJECT(bs_list); 1458 } 1459 1460 static void bdrv_stats_iter(QObject *data, void *opaque) 1461 { 1462 QDict *qdict; 1463 Monitor *mon = opaque; 1464 1465 qdict = qobject_to_qdict(data); 1466 monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); 1467 1468 qdict = qobject_to_qdict(qdict_get(qdict, "stats")); 1469 monitor_printf(mon, " rd_bytes=%" PRId64 1470 " wr_bytes=%" PRId64 1471 " rd_operations=%" PRId64 1472 " wr_operations=%" PRId64 1473 "\n", 1474 qdict_get_int(qdict, "rd_bytes"), 1475 qdict_get_int(qdict, "wr_bytes"), 1476 qdict_get_int(qdict, "rd_operations"), 1477 qdict_get_int(qdict, "wr_operations")); 1478 } 1479 1480 void bdrv_stats_print(Monitor *mon, const QObject *data) 1481 { 1482 qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); 1483 } 1484 1485 /** 1486 * bdrv_info_stats(): show block device statistics 1487 * 1488 * Each device statistic information is stored in a QDict and 1489 * the returned QObject is a QList of all devices. 1490 * 1491 * The QDict contains the following: 1492 * 1493 * - "device": device name 1494 * - "stats": A QDict with the statistics information, it contains: 1495 * - "rd_bytes": bytes read 1496 * - "wr_bytes": bytes written 1497 * - "rd_operations": read operations 1498 * - "wr_operations": write operations 1499 * 1500 * Example: 1501 * 1502 * [ { "device": "ide0-hd0", 1503 * "stats": { "rd_bytes": 512, 1504 * "wr_bytes": 0, 1505 * "rd_operations": 1, 1506 * "wr_operations": 0 } }, 1507 * { "device": "ide1-cd0", 1508 * "stats": { "rd_bytes": 0, 1509 * "wr_bytes": 0, 1510 * "rd_operations": 0, 1511 * "wr_operations": 0 } } ] 1512 */ 1513 void bdrv_info_stats(Monitor *mon, QObject **ret_data) 1514 { 1515 QObject *obj; 1516 QList *devices; 1517 BlockDriverState *bs; 1518 1519 devices = qlist_new(); 1520 1521 QTAILQ_FOREACH(bs, &bdrv_states, list) { 1522 obj = qobject_from_jsonf("{ 'device': %s, 'stats': {" 1523 "'rd_bytes': %" PRId64 "," 1524 "'wr_bytes': %" PRId64 "," 1525 "'rd_operations': %" PRId64 "," 1526 "'wr_operations': %" PRId64 1527 "} }", 1528 bs->device_name, 1529 bs->rd_bytes, bs->wr_bytes, 1530 bs->rd_ops, bs->wr_ops); 1531 qlist_append_obj(devices, obj); 1532 } 1533 1534 *ret_data = QOBJECT(devices); 1535 } 1536 1537 const char *bdrv_get_encrypted_filename(BlockDriverState *bs) 1538 { 1539 if (bs->backing_hd && bs->backing_hd->encrypted) 1540 return bs->backing_file; 1541 else if (bs->encrypted) 1542 return bs->filename; 1543 else 1544 return NULL; 1545 } 1546 1547 void bdrv_get_backing_filename(BlockDriverState *bs, 1548 char *filename, int filename_size) 1549 { 1550 if (!bs->backing_file) { 1551 pstrcpy(filename, filename_size, ""); 1552 } else { 1553 pstrcpy(filename, filename_size, bs->backing_file); 1554 } 1555 } 1556 1557 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, 1558 const uint8_t *buf, int nb_sectors) 1559 { 1560 BlockDriver *drv = bs->drv; 1561 if (!drv) 1562 return -ENOMEDIUM; 1563 if (!drv->bdrv_write_compressed) 1564 return -ENOTSUP; 1565 if (bdrv_check_request(bs, sector_num, nb_sectors)) 1566 return -EIO; 1567 1568 if (bs->dirty_bitmap) { 1569 set_dirty_bitmap(bs, sector_num, nb_sectors, 1); 1570 } 1571 1572 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); 1573 } 1574 1575 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 1576 { 1577 BlockDriver *drv = bs->drv; 1578 if (!drv) 1579 return -ENOMEDIUM; 1580 if (!drv->bdrv_get_info) 1581 return -ENOTSUP; 1582 memset(bdi, 0, sizeof(*bdi)); 1583 return drv->bdrv_get_info(bs, bdi); 1584 } 1585 1586 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 1587 int64_t pos, int size) 1588 { 1589 BlockDriver *drv = bs->drv; 1590 if (!drv) 1591 return -ENOMEDIUM; 1592 if (!drv->bdrv_save_vmstate) 1593 return -ENOTSUP; 1594 return drv->bdrv_save_vmstate(bs, buf, pos, size); 1595 } 1596 1597 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 1598 int64_t pos, int size) 1599 { 1600 BlockDriver *drv = bs->drv; 1601 if (!drv) 1602 return -ENOMEDIUM; 1603 if (!drv->bdrv_load_vmstate) 1604 return -ENOTSUP; 1605 return drv->bdrv_load_vmstate(bs, buf, pos, size); 1606 } 1607 1608 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) 1609 { 1610 BlockDriver *drv = bs->drv; 1611 1612 if (!drv || !drv->bdrv_debug_event) { 1613 return; 1614 } 1615 1616 return drv->bdrv_debug_event(bs, event); 1617 1618 } 1619 1620 /**************************************************************/ 1621 /* handling of snapshots */ 1622 1623 int bdrv_snapshot_create(BlockDriverState *bs, 1624 QEMUSnapshotInfo *sn_info) 1625 { 1626 BlockDriver *drv = bs->drv; 1627 if (!drv) 1628 return -ENOMEDIUM; 1629 if (!drv->bdrv_snapshot_create) 1630 return -ENOTSUP; 1631 return drv->bdrv_snapshot_create(bs, sn_info); 1632 } 1633 1634 int bdrv_snapshot_goto(BlockDriverState *bs, 1635 const char *snapshot_id) 1636 { 1637 BlockDriver *drv = bs->drv; 1638 if (!drv) 1639 return -ENOMEDIUM; 1640 if (!drv->bdrv_snapshot_goto) 1641 return -ENOTSUP; 1642 return drv->bdrv_snapshot_goto(bs, snapshot_id); 1643 } 1644 1645 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) 1646 { 1647 BlockDriver *drv = bs->drv; 1648 if (!drv) 1649 return -ENOMEDIUM; 1650 if (!drv->bdrv_snapshot_delete) 1651 return -ENOTSUP; 1652 return drv->bdrv_snapshot_delete(bs, snapshot_id); 1653 } 1654 1655 int bdrv_snapshot_list(BlockDriverState *bs, 1656 QEMUSnapshotInfo **psn_info) 1657 { 1658 BlockDriver *drv = bs->drv; 1659 if (!drv) 1660 return -ENOMEDIUM; 1661 if (!drv->bdrv_snapshot_list) 1662 return -ENOTSUP; 1663 return drv->bdrv_snapshot_list(bs, psn_info); 1664 } 1665 1666 #define NB_SUFFIXES 4 1667 1668 char *get_human_readable_size(char *buf, int buf_size, int64_t size) 1669 { 1670 static const char suffixes[NB_SUFFIXES] = "KMGT"; 1671 int64_t base; 1672 int i; 1673 1674 if (size <= 999) { 1675 snprintf(buf, buf_size, "%" PRId64, size); 1676 } else { 1677 base = 1024; 1678 for(i = 0; i < NB_SUFFIXES; i++) { 1679 if (size < (10 * base)) { 1680 snprintf(buf, buf_size, "%0.1f%c", 1681 (double)size / base, 1682 suffixes[i]); 1683 break; 1684 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { 1685 snprintf(buf, buf_size, "%" PRId64 "%c", 1686 ((size + (base >> 1)) / base), 1687 suffixes[i]); 1688 break; 1689 } 1690 base = base * 1024; 1691 } 1692 } 1693 return buf; 1694 } 1695 1696 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) 1697 { 1698 char buf1[128], date_buf[128], clock_buf[128]; 1699 #ifdef _WIN32 1700 struct tm *ptm; 1701 #else 1702 struct tm tm; 1703 #endif 1704 time_t ti; 1705 int64_t secs; 1706 1707 if (!sn) { 1708 snprintf(buf, buf_size, 1709 "%-10s%-20s%7s%20s%15s", 1710 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); 1711 } else { 1712 ti = sn->date_sec; 1713 #ifdef _WIN32 1714 ptm = localtime(&ti); 1715 strftime(date_buf, sizeof(date_buf), 1716 "%Y-%m-%d %H:%M:%S", ptm); 1717 #else 1718 localtime_r(&ti, &tm); 1719 strftime(date_buf, sizeof(date_buf), 1720 "%Y-%m-%d %H:%M:%S", &tm); 1721 #endif 1722 secs = sn->vm_clock_nsec / 1000000000; 1723 snprintf(clock_buf, sizeof(clock_buf), 1724 "%02d:%02d:%02d.%03d", 1725 (int)(secs / 3600), 1726 (int)((secs / 60) % 60), 1727 (int)(secs % 60), 1728 (int)((sn->vm_clock_nsec / 1000000) % 1000)); 1729 snprintf(buf, buf_size, 1730 "%-10s%-20s%7s%20s%15s", 1731 sn->id_str, sn->name, 1732 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), 1733 date_buf, 1734 clock_buf); 1735 } 1736 return buf; 1737 } 1738 1739 1740 /**************************************************************/ 1741 /* async I/Os */ 1742 1743 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, 1744 QEMUIOVector *qiov, int nb_sectors, 1745 BlockDriverCompletionFunc *cb, void *opaque) 1746 { 1747 BlockDriver *drv = bs->drv; 1748 BlockDriverAIOCB *ret; 1749 1750 if (!drv) 1751 return NULL; 1752 if (bdrv_check_request(bs, sector_num, nb_sectors)) 1753 return NULL; 1754 1755 ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, 1756 cb, opaque); 1757 1758 if (ret) { 1759 /* Update stats even though technically transfer has not happened. */ 1760 bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; 1761 bs->rd_ops ++; 1762 } 1763 1764 return ret; 1765 } 1766 1767 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, 1768 QEMUIOVector *qiov, int nb_sectors, 1769 BlockDriverCompletionFunc *cb, void *opaque) 1770 { 1771 BlockDriver *drv = bs->drv; 1772 BlockDriverAIOCB *ret; 1773 1774 if (!drv) 1775 return NULL; 1776 if (bs->read_only) 1777 return NULL; 1778 if (bdrv_check_request(bs, sector_num, nb_sectors)) 1779 return NULL; 1780 1781 if (bs->dirty_bitmap) { 1782 set_dirty_bitmap(bs, sector_num, nb_sectors, 1); 1783 } 1784 1785 ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, 1786 cb, opaque); 1787 1788 if (ret) { 1789 /* Update stats even though technically transfer has not happened. */ 1790 bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; 1791 bs->wr_ops ++; 1792 } 1793 1794 return ret; 1795 } 1796 1797 1798 typedef struct MultiwriteCB { 1799 int error; 1800 int num_requests; 1801 int num_callbacks; 1802 struct { 1803 BlockDriverCompletionFunc *cb; 1804 void *opaque; 1805 QEMUIOVector *free_qiov; 1806 void *free_buf; 1807 } callbacks[]; 1808 } MultiwriteCB; 1809 1810 static void multiwrite_user_cb(MultiwriteCB *mcb) 1811 { 1812 int i; 1813 1814 for (i = 0; i < mcb->num_callbacks; i++) { 1815 mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); 1816 if (mcb->callbacks[i].free_qiov) { 1817 qemu_iovec_destroy(mcb->callbacks[i].free_qiov); 1818 } 1819 qemu_free(mcb->callbacks[i].free_qiov); 1820 qemu_vfree(mcb->callbacks[i].free_buf); 1821 } 1822 } 1823 1824 static void multiwrite_cb(void *opaque, int ret) 1825 { 1826 MultiwriteCB *mcb = opaque; 1827 1828 if (ret < 0 && !mcb->error) { 1829 mcb->error = ret; 1830 multiwrite_user_cb(mcb); 1831 } 1832 1833 mcb->num_requests--; 1834 if (mcb->num_requests == 0) { 1835 if (mcb->error == 0) { 1836 multiwrite_user_cb(mcb); 1837 } 1838 qemu_free(mcb); 1839 } 1840 } 1841 1842 static int multiwrite_req_compare(const void *a, const void *b) 1843 { 1844 return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector); 1845 } 1846 1847 /* 1848 * Takes a bunch of requests and tries to merge them. Returns the number of 1849 * requests that remain after merging. 1850 */ 1851 static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, 1852 int num_reqs, MultiwriteCB *mcb) 1853 { 1854 int i, outidx; 1855 1856 // Sort requests by start sector 1857 qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); 1858 1859 // Check if adjacent requests touch the same clusters. If so, combine them, 1860 // filling up gaps with zero sectors. 1861 outidx = 0; 1862 for (i = 1; i < num_reqs; i++) { 1863 int merge = 0; 1864 int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; 1865 1866 // This handles the cases that are valid for all block drivers, namely 1867 // exactly sequential writes and overlapping writes. 1868 if (reqs[i].sector <= oldreq_last) { 1869 merge = 1; 1870 } 1871 1872 // The block driver may decide that it makes sense to combine requests 1873 // even if there is a gap of some sectors between them. In this case, 1874 // the gap is filled with zeros (therefore only applicable for yet 1875 // unused space in format like qcow2). 1876 if (!merge && bs->drv->bdrv_merge_requests) { 1877 merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); 1878 } 1879 1880 if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { 1881 merge = 0; 1882 } 1883 1884 if (merge) { 1885 size_t size; 1886 QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); 1887 qemu_iovec_init(qiov, 1888 reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); 1889 1890 // Add the first request to the merged one. If the requests are 1891 // overlapping, drop the last sectors of the first request. 1892 size = (reqs[i].sector - reqs[outidx].sector) << 9; 1893 qemu_iovec_concat(qiov, reqs[outidx].qiov, size); 1894 1895 // We might need to add some zeros between the two requests 1896 if (reqs[i].sector > oldreq_last) { 1897 size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; 1898 uint8_t *buf = qemu_blockalign(bs, zero_bytes); 1899 memset(buf, 0, zero_bytes); 1900 qemu_iovec_add(qiov, buf, zero_bytes); 1901 mcb->callbacks[i].free_buf = buf; 1902 } 1903 1904 // Add the second request 1905 qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); 1906 1907 reqs[outidx].nb_sectors += reqs[i].nb_sectors; 1908 reqs[outidx].qiov = qiov; 1909 1910 mcb->callbacks[i].free_qiov = reqs[outidx].qiov; 1911 } else { 1912 outidx++; 1913 reqs[outidx].sector = reqs[i].sector; 1914 reqs[outidx].nb_sectors = reqs[i].nb_sectors; 1915 reqs[outidx].qiov = reqs[i].qiov; 1916 } 1917 } 1918 1919 return outidx + 1; 1920 } 1921 1922 /* 1923 * Submit multiple AIO write requests at once. 1924 * 1925 * On success, the function returns 0 and all requests in the reqs array have 1926 * been submitted. In error case this function returns -1, and any of the 1927 * requests may or may not be submitted yet. In particular, this means that the 1928 * callback will be called for some of the requests, for others it won't. The 1929 * caller must check the error field of the BlockRequest to wait for the right 1930 * callbacks (if error != 0, no callback will be called). 1931 * 1932 * The implementation may modify the contents of the reqs array, e.g. to merge 1933 * requests. However, the fields opaque and error are left unmodified as they 1934 * are used to signal failure for a single request to the caller. 1935 */ 1936 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) 1937 { 1938 BlockDriverAIOCB *acb; 1939 MultiwriteCB *mcb; 1940 int i; 1941 1942 if (num_reqs == 0) { 1943 return 0; 1944 } 1945 1946 // Create MultiwriteCB structure 1947 mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); 1948 mcb->num_requests = 0; 1949 mcb->num_callbacks = num_reqs; 1950 1951 for (i = 0; i < num_reqs; i++) { 1952 mcb->callbacks[i].cb = reqs[i].cb; 1953 mcb->callbacks[i].opaque = reqs[i].opaque; 1954 } 1955 1956 // Check for mergable requests 1957 num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); 1958 1959 // Run the aio requests 1960 for (i = 0; i < num_reqs; i++) { 1961 acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, 1962 reqs[i].nb_sectors, multiwrite_cb, mcb); 1963 1964 if (acb == NULL) { 1965 // We can only fail the whole thing if no request has been 1966 // submitted yet. Otherwise we'll wait for the submitted AIOs to 1967 // complete and report the error in the callback. 1968 if (mcb->num_requests == 0) { 1969 reqs[i].error = -EIO; 1970 goto fail; 1971 } else { 1972 mcb->num_requests++; 1973 multiwrite_cb(mcb, -EIO); 1974 break; 1975 } 1976 } else { 1977 mcb->num_requests++; 1978 } 1979 } 1980 1981 return 0; 1982 1983 fail: 1984 free(mcb); 1985 return -1; 1986 } 1987 1988 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, 1989 BlockDriverCompletionFunc *cb, void *opaque) 1990 { 1991 BlockDriver *drv = bs->drv; 1992 1993 if (!drv) 1994 return NULL; 1995 return drv->bdrv_aio_flush(bs, cb, opaque); 1996 } 1997 1998 void bdrv_aio_cancel(BlockDriverAIOCB *acb) 1999 { 2000 acb->pool->cancel(acb); 2001 } 2002 2003 2004 /**************************************************************/ 2005 /* async block device emulation */ 2006 2007 typedef struct BlockDriverAIOCBSync { 2008 BlockDriverAIOCB common; 2009 QEMUBH *bh; 2010 int ret; 2011 /* vector translation state */ 2012 QEMUIOVector *qiov; 2013 uint8_t *bounce; 2014 int is_write; 2015 } BlockDriverAIOCBSync; 2016 2017 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) 2018 { 2019 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; 2020 qemu_bh_delete(acb->bh); 2021 acb->bh = NULL; 2022 qemu_aio_release(acb); 2023 } 2024 2025 static AIOPool bdrv_em_aio_pool = { 2026 .aiocb_size = sizeof(BlockDriverAIOCBSync), 2027 .cancel = bdrv_aio_cancel_em, 2028 }; 2029 2030 static void bdrv_aio_bh_cb(void *opaque) 2031 { 2032 BlockDriverAIOCBSync *acb = opaque; 2033 2034 if (!acb->is_write) 2035 qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); 2036 qemu_vfree(acb->bounce); 2037 acb->common.cb(acb->common.opaque, acb->ret); 2038 qemu_bh_delete(acb->bh); 2039 acb->bh = NULL; 2040 qemu_aio_release(acb); 2041 } 2042 2043 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, 2044 int64_t sector_num, 2045 QEMUIOVector *qiov, 2046 int nb_sectors, 2047 BlockDriverCompletionFunc *cb, 2048 void *opaque, 2049 int is_write) 2050 2051 { 2052 BlockDriverAIOCBSync *acb; 2053 2054 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); 2055 acb->is_write = is_write; 2056 acb->qiov = qiov; 2057 acb->bounce = qemu_blockalign(bs, qiov->size); 2058 2059 if (!acb->bh) 2060 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); 2061 2062 if (is_write) { 2063 qemu_iovec_to_buffer(acb->qiov, acb->bounce); 2064 acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); 2065 } else { 2066 acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); 2067 } 2068 2069 qemu_bh_schedule(acb->bh); 2070 2071 return &acb->common; 2072 } 2073 2074 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, 2075 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 2076 BlockDriverCompletionFunc *cb, void *opaque) 2077 { 2078 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); 2079 } 2080 2081 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, 2082 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 2083 BlockDriverCompletionFunc *cb, void *opaque) 2084 { 2085 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); 2086 } 2087 2088 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, 2089 BlockDriverCompletionFunc *cb, void *opaque) 2090 { 2091 BlockDriverAIOCBSync *acb; 2092 2093 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); 2094 acb->is_write = 1; /* don't bounce in the completion hadler */ 2095 acb->qiov = NULL; 2096 acb->bounce = NULL; 2097 acb->ret = 0; 2098 2099 if (!acb->bh) 2100 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); 2101 2102 bdrv_flush(bs); 2103 qemu_bh_schedule(acb->bh); 2104 return &acb->common; 2105 } 2106 2107 /**************************************************************/ 2108 /* sync block device emulation */ 2109 2110 static void bdrv_rw_em_cb(void *opaque, int ret) 2111 { 2112 *(int *)opaque = ret; 2113 } 2114 2115 #define NOT_DONE 0x7fffffff 2116 2117 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, 2118 uint8_t *buf, int nb_sectors) 2119 { 2120 int async_ret; 2121 BlockDriverAIOCB *acb; 2122 struct iovec iov; 2123 QEMUIOVector qiov; 2124 2125 async_context_push(); 2126 2127 async_ret = NOT_DONE; 2128 iov.iov_base = (void *)buf; 2129 iov.iov_len = nb_sectors * 512; 2130 qemu_iovec_init_external(&qiov, &iov, 1); 2131 acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, 2132 bdrv_rw_em_cb, &async_ret); 2133 if (acb == NULL) { 2134 async_ret = -1; 2135 goto fail; 2136 } 2137 2138 while (async_ret == NOT_DONE) { 2139 qemu_aio_wait(); 2140 } 2141 2142 2143 fail: 2144 async_context_pop(); 2145 return async_ret; 2146 } 2147 2148 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, 2149 const uint8_t *buf, int nb_sectors) 2150 { 2151 int async_ret; 2152 BlockDriverAIOCB *acb; 2153 struct iovec iov; 2154 QEMUIOVector qiov; 2155 2156 async_context_push(); 2157 2158 async_ret = NOT_DONE; 2159 iov.iov_base = (void *)buf; 2160 iov.iov_len = nb_sectors * 512; 2161 qemu_iovec_init_external(&qiov, &iov, 1); 2162 acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, 2163 bdrv_rw_em_cb, &async_ret); 2164 if (acb == NULL) { 2165 async_ret = -1; 2166 goto fail; 2167 } 2168 while (async_ret == NOT_DONE) { 2169 qemu_aio_wait(); 2170 } 2171 2172 fail: 2173 async_context_pop(); 2174 return async_ret; 2175 } 2176 2177 void bdrv_init(void) 2178 { 2179 module_call_init(MODULE_INIT_BLOCK); 2180 } 2181 2182 void bdrv_init_with_whitelist(void) 2183 { 2184 use_bdrv_whitelist = 1; 2185 bdrv_init(); 2186 } 2187 2188 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, 2189 BlockDriverCompletionFunc *cb, void *opaque) 2190 { 2191 BlockDriverAIOCB *acb; 2192 2193 if (pool->free_aiocb) { 2194 acb = pool->free_aiocb; 2195 pool->free_aiocb = acb->next; 2196 } else { 2197 acb = qemu_mallocz(pool->aiocb_size); 2198 acb->pool = pool; 2199 } 2200 acb->bs = bs; 2201 acb->cb = cb; 2202 acb->opaque = opaque; 2203 return acb; 2204 } 2205 2206 void qemu_aio_release(void *p) 2207 { 2208 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; 2209 AIOPool *pool = acb->pool; 2210 acb->next = pool->free_aiocb; 2211 pool->free_aiocb = acb; 2212 } 2213 2214 /**************************************************************/ 2215 /* removable device support */ 2216 2217 /** 2218 * Return TRUE if the media is present 2219 */ 2220 int bdrv_is_inserted(BlockDriverState *bs) 2221 { 2222 BlockDriver *drv = bs->drv; 2223 int ret; 2224 if (!drv) 2225 return 0; 2226 if (!drv->bdrv_is_inserted) 2227 return 1; 2228 ret = drv->bdrv_is_inserted(bs); 2229 return ret; 2230 } 2231 2232 /** 2233 * Return TRUE if the media changed since the last call to this 2234 * function. It is currently only used for floppy disks 2235 */ 2236 int bdrv_media_changed(BlockDriverState *bs) 2237 { 2238 BlockDriver *drv = bs->drv; 2239 int ret; 2240 2241 if (!drv || !drv->bdrv_media_changed) 2242 ret = -ENOTSUP; 2243 else 2244 ret = drv->bdrv_media_changed(bs); 2245 if (ret == -ENOTSUP) 2246 ret = bs->media_changed; 2247 bs->media_changed = 0; 2248 return ret; 2249 } 2250 2251 /** 2252 * If eject_flag is TRUE, eject the media. Otherwise, close the tray 2253 */ 2254 int bdrv_eject(BlockDriverState *bs, int eject_flag) 2255 { 2256 BlockDriver *drv = bs->drv; 2257 int ret; 2258 2259 if (bs->locked) { 2260 return -EBUSY; 2261 } 2262 2263 if (!drv || !drv->bdrv_eject) { 2264 ret = -ENOTSUP; 2265 } else { 2266 ret = drv->bdrv_eject(bs, eject_flag); 2267 } 2268 if (ret == -ENOTSUP) { 2269 if (eject_flag) 2270 bdrv_close(bs); 2271 ret = 0; 2272 } 2273 2274 return ret; 2275 } 2276 2277 int bdrv_is_locked(BlockDriverState *bs) 2278 { 2279 return bs->locked; 2280 } 2281 2282 /** 2283 * Lock or unlock the media (if it is locked, the user won't be able 2284 * to eject it manually). 2285 */ 2286 void bdrv_set_locked(BlockDriverState *bs, int locked) 2287 { 2288 BlockDriver *drv = bs->drv; 2289 2290 bs->locked = locked; 2291 if (drv && drv->bdrv_set_locked) { 2292 drv->bdrv_set_locked(bs, locked); 2293 } 2294 } 2295 2296 /* needed for generic scsi interface */ 2297 2298 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 2299 { 2300 BlockDriver *drv = bs->drv; 2301 2302 if (drv && drv->bdrv_ioctl) 2303 return drv->bdrv_ioctl(bs, req, buf); 2304 return -ENOTSUP; 2305 } 2306 2307 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, 2308 unsigned long int req, void *buf, 2309 BlockDriverCompletionFunc *cb, void *opaque) 2310 { 2311 BlockDriver *drv = bs->drv; 2312 2313 if (drv && drv->bdrv_aio_ioctl) 2314 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); 2315 return NULL; 2316 } 2317 2318 2319 2320 void *qemu_blockalign(BlockDriverState *bs, size_t size) 2321 { 2322 return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); 2323 } 2324 2325 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) 2326 { 2327 int64_t bitmap_size; 2328 2329 bs->dirty_count = 0; 2330 if (enable) { 2331 if (!bs->dirty_bitmap) { 2332 bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + 2333 BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; 2334 bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; 2335 2336 bs->dirty_bitmap = qemu_mallocz(bitmap_size); 2337 } 2338 } else { 2339 if (bs->dirty_bitmap) { 2340 qemu_free(bs->dirty_bitmap); 2341 bs->dirty_bitmap = NULL; 2342 } 2343 } 2344 } 2345 2346 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) 2347 { 2348 int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; 2349 2350 if (bs->dirty_bitmap && 2351 (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { 2352 return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & 2353 (1 << (chunk % (sizeof(unsigned long) * 8))); 2354 } else { 2355 return 0; 2356 } 2357 } 2358 2359 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, 2360 int nr_sectors) 2361 { 2362 set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); 2363 } 2364 2365 int64_t bdrv_get_dirty_count(BlockDriverState *bs) 2366 { 2367 return bs->dirty_count; 2368 } 2369