1 /* 2 * Block driver for RAW files (win32) 3 * 4 * Copyright (c) 2006 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 "qemu/osdep.h" 25 #include "qapi/error.h" 26 #include "qemu/cutils.h" 27 #include "block/block_int.h" 28 #include "qemu/module.h" 29 #include "block/raw-aio.h" 30 #include "trace.h" 31 #include "block/thread-pool.h" 32 #include "qemu/iov.h" 33 #include "qapi/qmp/qstring.h" 34 #include "qapi/util.h" 35 #include <windows.h> 36 #include <winioctl.h> 37 38 #define FTYPE_FILE 0 39 #define FTYPE_CD 1 40 #define FTYPE_HARDDISK 2 41 42 typedef struct RawWin32AIOData { 43 BlockDriverState *bs; 44 HANDLE hfile; 45 struct iovec *aio_iov; 46 int aio_niov; 47 size_t aio_nbytes; 48 off64_t aio_offset; 49 int aio_type; 50 } RawWin32AIOData; 51 52 typedef struct BDRVRawState { 53 HANDLE hfile; 54 int type; 55 char drive_path[16]; /* format: "d:\" */ 56 QEMUWin32AIOState *aio; 57 } BDRVRawState; 58 59 /* 60 * Read/writes the data to/from a given linear buffer. 61 * 62 * Returns the number of bytes handles or -errno in case of an error. Short 63 * reads are only returned if the end of the file is reached. 64 */ 65 static size_t handle_aiocb_rw(RawWin32AIOData *aiocb) 66 { 67 size_t offset = 0; 68 int i; 69 70 for (i = 0; i < aiocb->aio_niov; i++) { 71 OVERLAPPED ov; 72 DWORD ret, ret_count, len; 73 74 memset(&ov, 0, sizeof(ov)); 75 ov.Offset = (aiocb->aio_offset + offset); 76 ov.OffsetHigh = (aiocb->aio_offset + offset) >> 32; 77 len = aiocb->aio_iov[i].iov_len; 78 if (aiocb->aio_type & QEMU_AIO_WRITE) { 79 ret = WriteFile(aiocb->hfile, aiocb->aio_iov[i].iov_base, 80 len, &ret_count, &ov); 81 } else { 82 ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base, 83 len, &ret_count, &ov); 84 } 85 if (!ret) { 86 ret_count = 0; 87 } 88 if (ret_count != len) { 89 offset += ret_count; 90 break; 91 } 92 offset += len; 93 } 94 95 return offset; 96 } 97 98 static int aio_worker(void *arg) 99 { 100 RawWin32AIOData *aiocb = arg; 101 ssize_t ret = 0; 102 size_t count; 103 104 switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) { 105 case QEMU_AIO_READ: 106 count = handle_aiocb_rw(aiocb); 107 if (count < aiocb->aio_nbytes) { 108 /* A short read means that we have reached EOF. Pad the buffer 109 * with zeros for bytes after EOF. */ 110 iov_memset(aiocb->aio_iov, aiocb->aio_niov, count, 111 0, aiocb->aio_nbytes - count); 112 113 count = aiocb->aio_nbytes; 114 } 115 if (count == aiocb->aio_nbytes) { 116 ret = 0; 117 } else { 118 ret = -EINVAL; 119 } 120 break; 121 case QEMU_AIO_WRITE: 122 count = handle_aiocb_rw(aiocb); 123 if (count == aiocb->aio_nbytes) { 124 ret = 0; 125 } else { 126 ret = -EINVAL; 127 } 128 break; 129 case QEMU_AIO_FLUSH: 130 if (!FlushFileBuffers(aiocb->hfile)) { 131 return -EIO; 132 } 133 break; 134 default: 135 fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type); 136 ret = -EINVAL; 137 break; 138 } 139 140 g_free(aiocb); 141 return ret; 142 } 143 144 static BlockAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile, 145 int64_t offset, QEMUIOVector *qiov, int count, 146 BlockCompletionFunc *cb, void *opaque, int type) 147 { 148 RawWin32AIOData *acb = g_new(RawWin32AIOData, 1); 149 ThreadPool *pool; 150 151 acb->bs = bs; 152 acb->hfile = hfile; 153 acb->aio_type = type; 154 155 if (qiov) { 156 acb->aio_iov = qiov->iov; 157 acb->aio_niov = qiov->niov; 158 assert(qiov->size == count); 159 } 160 acb->aio_nbytes = count; 161 acb->aio_offset = offset; 162 163 trace_paio_submit(acb, opaque, offset, count, type); 164 pool = aio_get_thread_pool(bdrv_get_aio_context(bs)); 165 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque); 166 } 167 168 int qemu_ftruncate64(int fd, int64_t length) 169 { 170 LARGE_INTEGER li; 171 DWORD dw; 172 LONG high; 173 HANDLE h; 174 BOOL res; 175 176 if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0) 177 return -1; 178 179 h = (HANDLE)_get_osfhandle(fd); 180 181 /* get current position, ftruncate do not change position */ 182 li.HighPart = 0; 183 li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT); 184 if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) { 185 return -1; 186 } 187 188 high = length >> 32; 189 dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN); 190 if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) { 191 return -1; 192 } 193 res = SetEndOfFile(h); 194 195 /* back to old position */ 196 SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN); 197 return res ? 0 : -1; 198 } 199 200 static int set_sparse(int fd) 201 { 202 DWORD returned; 203 return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE, 204 NULL, 0, NULL, 0, &returned, NULL); 205 } 206 207 static void raw_detach_aio_context(BlockDriverState *bs) 208 { 209 BDRVRawState *s = bs->opaque; 210 211 if (s->aio) { 212 win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs)); 213 } 214 } 215 216 static void raw_attach_aio_context(BlockDriverState *bs, 217 AioContext *new_context) 218 { 219 BDRVRawState *s = bs->opaque; 220 221 if (s->aio) { 222 win32_aio_attach_aio_context(s->aio, new_context); 223 } 224 } 225 226 static void raw_probe_alignment(BlockDriverState *bs, Error **errp) 227 { 228 BDRVRawState *s = bs->opaque; 229 DWORD sectorsPerCluster, freeClusters, totalClusters, count; 230 DISK_GEOMETRY_EX dg; 231 BOOL status; 232 233 if (s->type == FTYPE_CD) { 234 bs->bl.request_alignment = 2048; 235 return; 236 } 237 if (s->type == FTYPE_HARDDISK) { 238 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX, 239 NULL, 0, &dg, sizeof(dg), &count, NULL); 240 if (status != 0) { 241 bs->bl.request_alignment = dg.Geometry.BytesPerSector; 242 return; 243 } 244 /* try GetDiskFreeSpace too */ 245 } 246 247 if (s->drive_path[0]) { 248 GetDiskFreeSpace(s->drive_path, §orsPerCluster, 249 &dg.Geometry.BytesPerSector, 250 &freeClusters, &totalClusters); 251 bs->bl.request_alignment = dg.Geometry.BytesPerSector; 252 } 253 } 254 255 static void raw_parse_flags(int flags, bool use_aio, int *access_flags, 256 DWORD *overlapped) 257 { 258 assert(access_flags != NULL); 259 assert(overlapped != NULL); 260 261 if (flags & BDRV_O_RDWR) { 262 *access_flags = GENERIC_READ | GENERIC_WRITE; 263 } else { 264 *access_flags = GENERIC_READ; 265 } 266 267 *overlapped = FILE_ATTRIBUTE_NORMAL; 268 if (use_aio) { 269 *overlapped |= FILE_FLAG_OVERLAPPED; 270 } 271 if (flags & BDRV_O_NOCACHE) { 272 *overlapped |= FILE_FLAG_NO_BUFFERING; 273 } 274 } 275 276 static void raw_parse_filename(const char *filename, QDict *options, 277 Error **errp) 278 { 279 /* The filename does not have to be prefixed by the protocol name, since 280 * "file" is the default protocol; therefore, the return value of this 281 * function call can be ignored. */ 282 strstart(filename, "file:", &filename); 283 284 qdict_put_str(options, "filename", filename); 285 } 286 287 static QemuOptsList raw_runtime_opts = { 288 .name = "raw", 289 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head), 290 .desc = { 291 { 292 .name = "filename", 293 .type = QEMU_OPT_STRING, 294 .help = "File name of the image", 295 }, 296 { 297 .name = "aio", 298 .type = QEMU_OPT_STRING, 299 .help = "host AIO implementation (threads, native)", 300 }, 301 { /* end of list */ } 302 }, 303 }; 304 305 static bool get_aio_option(QemuOpts *opts, int flags, Error **errp) 306 { 307 BlockdevAioOptions aio, aio_default; 308 309 aio_default = (flags & BDRV_O_NATIVE_AIO) ? BLOCKDEV_AIO_OPTIONS_NATIVE 310 : BLOCKDEV_AIO_OPTIONS_THREADS; 311 aio = qapi_enum_parse(BlockdevAioOptions_lookup, qemu_opt_get(opts, "aio"), 312 BLOCKDEV_AIO_OPTIONS__MAX, aio_default, errp); 313 314 switch (aio) { 315 case BLOCKDEV_AIO_OPTIONS_NATIVE: 316 return true; 317 case BLOCKDEV_AIO_OPTIONS_THREADS: 318 return false; 319 default: 320 error_setg(errp, "Invalid AIO option"); 321 } 322 return false; 323 } 324 325 static int raw_open(BlockDriverState *bs, QDict *options, int flags, 326 Error **errp) 327 { 328 BDRVRawState *s = bs->opaque; 329 int access_flags; 330 DWORD overlapped; 331 QemuOpts *opts; 332 Error *local_err = NULL; 333 const char *filename; 334 bool use_aio; 335 int ret; 336 337 s->type = FTYPE_FILE; 338 339 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); 340 qemu_opts_absorb_qdict(opts, options, &local_err); 341 if (local_err) { 342 error_propagate(errp, local_err); 343 ret = -EINVAL; 344 goto fail; 345 } 346 347 filename = qemu_opt_get(opts, "filename"); 348 349 use_aio = get_aio_option(opts, flags, &local_err); 350 if (local_err) { 351 error_propagate(errp, local_err); 352 ret = -EINVAL; 353 goto fail; 354 } 355 356 raw_parse_flags(flags, use_aio, &access_flags, &overlapped); 357 358 if (filename[0] && filename[1] == ':') { 359 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", filename[0]); 360 } else if (filename[0] == '\\' && filename[1] == '\\') { 361 s->drive_path[0] = 0; 362 } else { 363 /* Relative path. */ 364 char buf[MAX_PATH]; 365 GetCurrentDirectory(MAX_PATH, buf); 366 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", buf[0]); 367 } 368 369 s->hfile = CreateFile(filename, access_flags, 370 FILE_SHARE_READ, NULL, 371 OPEN_EXISTING, overlapped, NULL); 372 if (s->hfile == INVALID_HANDLE_VALUE) { 373 int err = GetLastError(); 374 375 error_setg_win32(errp, err, "Could not open '%s'", filename); 376 if (err == ERROR_ACCESS_DENIED) { 377 ret = -EACCES; 378 } else { 379 ret = -EINVAL; 380 } 381 goto fail; 382 } 383 384 if (use_aio) { 385 s->aio = win32_aio_init(); 386 if (s->aio == NULL) { 387 CloseHandle(s->hfile); 388 error_setg(errp, "Could not initialize AIO"); 389 ret = -EINVAL; 390 goto fail; 391 } 392 393 ret = win32_aio_attach(s->aio, s->hfile); 394 if (ret < 0) { 395 win32_aio_cleanup(s->aio); 396 CloseHandle(s->hfile); 397 error_setg_errno(errp, -ret, "Could not enable AIO"); 398 goto fail; 399 } 400 401 win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs)); 402 } 403 404 ret = 0; 405 fail: 406 qemu_opts_del(opts); 407 return ret; 408 } 409 410 static BlockAIOCB *raw_aio_readv(BlockDriverState *bs, 411 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 412 BlockCompletionFunc *cb, void *opaque) 413 { 414 BDRVRawState *s = bs->opaque; 415 if (s->aio) { 416 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov, 417 nb_sectors, cb, opaque, QEMU_AIO_READ); 418 } else { 419 return paio_submit(bs, s->hfile, sector_num << BDRV_SECTOR_BITS, qiov, 420 nb_sectors << BDRV_SECTOR_BITS, 421 cb, opaque, QEMU_AIO_READ); 422 } 423 } 424 425 static BlockAIOCB *raw_aio_writev(BlockDriverState *bs, 426 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 427 BlockCompletionFunc *cb, void *opaque) 428 { 429 BDRVRawState *s = bs->opaque; 430 if (s->aio) { 431 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov, 432 nb_sectors, cb, opaque, QEMU_AIO_WRITE); 433 } else { 434 return paio_submit(bs, s->hfile, sector_num << BDRV_SECTOR_BITS, qiov, 435 nb_sectors << BDRV_SECTOR_BITS, 436 cb, opaque, QEMU_AIO_WRITE); 437 } 438 } 439 440 static BlockAIOCB *raw_aio_flush(BlockDriverState *bs, 441 BlockCompletionFunc *cb, void *opaque) 442 { 443 BDRVRawState *s = bs->opaque; 444 return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH); 445 } 446 447 static void raw_close(BlockDriverState *bs) 448 { 449 BDRVRawState *s = bs->opaque; 450 451 if (s->aio) { 452 win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs)); 453 win32_aio_cleanup(s->aio); 454 s->aio = NULL; 455 } 456 457 CloseHandle(s->hfile); 458 if (bs->open_flags & BDRV_O_TEMPORARY) { 459 unlink(bs->filename); 460 } 461 } 462 463 static int raw_truncate(BlockDriverState *bs, int64_t offset, Error **errp) 464 { 465 BDRVRawState *s = bs->opaque; 466 LONG low, high; 467 DWORD dwPtrLow; 468 469 low = offset; 470 high = offset >> 32; 471 472 /* 473 * An error has occurred if the return value is INVALID_SET_FILE_POINTER 474 * and GetLastError doesn't return NO_ERROR. 475 */ 476 dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN); 477 if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) { 478 error_setg_win32(errp, GetLastError(), "SetFilePointer error"); 479 return -EIO; 480 } 481 if (SetEndOfFile(s->hfile) == 0) { 482 error_setg_win32(errp, GetLastError(), "SetEndOfFile error"); 483 return -EIO; 484 } 485 return 0; 486 } 487 488 static int64_t raw_getlength(BlockDriverState *bs) 489 { 490 BDRVRawState *s = bs->opaque; 491 LARGE_INTEGER l; 492 ULARGE_INTEGER available, total, total_free; 493 DISK_GEOMETRY_EX dg; 494 DWORD count; 495 BOOL status; 496 497 switch(s->type) { 498 case FTYPE_FILE: 499 l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart); 500 if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR) 501 return -EIO; 502 break; 503 case FTYPE_CD: 504 if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free)) 505 return -EIO; 506 l.QuadPart = total.QuadPart; 507 break; 508 case FTYPE_HARDDISK: 509 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX, 510 NULL, 0, &dg, sizeof(dg), &count, NULL); 511 if (status != 0) { 512 l = dg.DiskSize; 513 } 514 break; 515 default: 516 return -EIO; 517 } 518 return l.QuadPart; 519 } 520 521 static int64_t raw_get_allocated_file_size(BlockDriverState *bs) 522 { 523 typedef DWORD (WINAPI * get_compressed_t)(const char *filename, 524 DWORD * high); 525 get_compressed_t get_compressed; 526 struct _stati64 st; 527 const char *filename = bs->filename; 528 /* WinNT support GetCompressedFileSize to determine allocate size */ 529 get_compressed = 530 (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), 531 "GetCompressedFileSizeA"); 532 if (get_compressed) { 533 DWORD high, low; 534 low = get_compressed(filename, &high); 535 if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) { 536 return (((int64_t) high) << 32) + low; 537 } 538 } 539 540 if (_stati64(filename, &st) < 0) { 541 return -1; 542 } 543 return st.st_size; 544 } 545 546 static int raw_create(const char *filename, QemuOpts *opts, Error **errp) 547 { 548 int fd; 549 int64_t total_size = 0; 550 551 strstart(filename, "file:", &filename); 552 553 /* Read out options */ 554 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 555 BDRV_SECTOR_SIZE); 556 557 fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 558 0644); 559 if (fd < 0) { 560 error_setg_errno(errp, errno, "Could not create file"); 561 return -EIO; 562 } 563 set_sparse(fd); 564 ftruncate(fd, total_size); 565 qemu_close(fd); 566 return 0; 567 } 568 569 570 static QemuOptsList raw_create_opts = { 571 .name = "raw-create-opts", 572 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head), 573 .desc = { 574 { 575 .name = BLOCK_OPT_SIZE, 576 .type = QEMU_OPT_SIZE, 577 .help = "Virtual disk size" 578 }, 579 { /* end of list */ } 580 } 581 }; 582 583 BlockDriver bdrv_file = { 584 .format_name = "file", 585 .protocol_name = "file", 586 .instance_size = sizeof(BDRVRawState), 587 .bdrv_needs_filename = true, 588 .bdrv_parse_filename = raw_parse_filename, 589 .bdrv_file_open = raw_open, 590 .bdrv_refresh_limits = raw_probe_alignment, 591 .bdrv_close = raw_close, 592 .bdrv_create = raw_create, 593 .bdrv_has_zero_init = bdrv_has_zero_init_1, 594 595 .bdrv_aio_readv = raw_aio_readv, 596 .bdrv_aio_writev = raw_aio_writev, 597 .bdrv_aio_flush = raw_aio_flush, 598 599 .bdrv_truncate = raw_truncate, 600 .bdrv_getlength = raw_getlength, 601 .bdrv_get_allocated_file_size 602 = raw_get_allocated_file_size, 603 604 .create_opts = &raw_create_opts, 605 }; 606 607 /***********************************************/ 608 /* host device */ 609 610 static int find_cdrom(char *cdrom_name, int cdrom_name_size) 611 { 612 char drives[256], *pdrv = drives; 613 UINT type; 614 615 memset(drives, 0, sizeof(drives)); 616 GetLogicalDriveStrings(sizeof(drives), drives); 617 while(pdrv[0] != '\0') { 618 type = GetDriveType(pdrv); 619 switch(type) { 620 case DRIVE_CDROM: 621 snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]); 622 return 0; 623 break; 624 } 625 pdrv += lstrlen(pdrv) + 1; 626 } 627 return -1; 628 } 629 630 static int find_device_type(BlockDriverState *bs, const char *filename) 631 { 632 BDRVRawState *s = bs->opaque; 633 UINT type; 634 const char *p; 635 636 if (strstart(filename, "\\\\.\\", &p) || 637 strstart(filename, "//./", &p)) { 638 if (stristart(p, "PhysicalDrive", NULL)) 639 return FTYPE_HARDDISK; 640 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]); 641 type = GetDriveType(s->drive_path); 642 switch (type) { 643 case DRIVE_REMOVABLE: 644 case DRIVE_FIXED: 645 return FTYPE_HARDDISK; 646 case DRIVE_CDROM: 647 return FTYPE_CD; 648 default: 649 return FTYPE_FILE; 650 } 651 } else { 652 return FTYPE_FILE; 653 } 654 } 655 656 static int hdev_probe_device(const char *filename) 657 { 658 if (strstart(filename, "/dev/cdrom", NULL)) 659 return 100; 660 if (is_windows_drive(filename)) 661 return 100; 662 return 0; 663 } 664 665 static void hdev_parse_filename(const char *filename, QDict *options, 666 Error **errp) 667 { 668 /* The prefix is optional, just as for "file". */ 669 strstart(filename, "host_device:", &filename); 670 671 qdict_put_str(options, "filename", filename); 672 } 673 674 static int hdev_open(BlockDriverState *bs, QDict *options, int flags, 675 Error **errp) 676 { 677 BDRVRawState *s = bs->opaque; 678 int access_flags, create_flags; 679 int ret = 0; 680 DWORD overlapped; 681 char device_name[64]; 682 683 Error *local_err = NULL; 684 const char *filename; 685 bool use_aio; 686 687 QemuOpts *opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, 688 &error_abort); 689 qemu_opts_absorb_qdict(opts, options, &local_err); 690 if (local_err) { 691 error_propagate(errp, local_err); 692 ret = -EINVAL; 693 goto done; 694 } 695 696 filename = qemu_opt_get(opts, "filename"); 697 698 use_aio = get_aio_option(opts, flags, &local_err); 699 if (!local_err && use_aio) { 700 error_setg(&local_err, "AIO is not supported on Windows host devices"); 701 } 702 if (local_err) { 703 error_propagate(errp, local_err); 704 ret = -EINVAL; 705 goto done; 706 } 707 708 if (strstart(filename, "/dev/cdrom", NULL)) { 709 if (find_cdrom(device_name, sizeof(device_name)) < 0) { 710 error_setg(errp, "Could not open CD-ROM drive"); 711 ret = -ENOENT; 712 goto done; 713 } 714 filename = device_name; 715 } else { 716 /* transform drive letters into device name */ 717 if (((filename[0] >= 'a' && filename[0] <= 'z') || 718 (filename[0] >= 'A' && filename[0] <= 'Z')) && 719 filename[1] == ':' && filename[2] == '\0') { 720 snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]); 721 filename = device_name; 722 } 723 } 724 s->type = find_device_type(bs, filename); 725 726 raw_parse_flags(flags, use_aio, &access_flags, &overlapped); 727 728 create_flags = OPEN_EXISTING; 729 730 s->hfile = CreateFile(filename, access_flags, 731 FILE_SHARE_READ, NULL, 732 create_flags, overlapped, NULL); 733 if (s->hfile == INVALID_HANDLE_VALUE) { 734 int err = GetLastError(); 735 736 if (err == ERROR_ACCESS_DENIED) { 737 ret = -EACCES; 738 } else { 739 ret = -EINVAL; 740 } 741 error_setg_errno(errp, -ret, "Could not open device"); 742 goto done; 743 } 744 745 done: 746 qemu_opts_del(opts); 747 return ret; 748 } 749 750 static BlockDriver bdrv_host_device = { 751 .format_name = "host_device", 752 .protocol_name = "host_device", 753 .instance_size = sizeof(BDRVRawState), 754 .bdrv_needs_filename = true, 755 .bdrv_parse_filename = hdev_parse_filename, 756 .bdrv_probe_device = hdev_probe_device, 757 .bdrv_file_open = hdev_open, 758 .bdrv_close = raw_close, 759 760 .bdrv_aio_readv = raw_aio_readv, 761 .bdrv_aio_writev = raw_aio_writev, 762 .bdrv_aio_flush = raw_aio_flush, 763 764 .bdrv_detach_aio_context = raw_detach_aio_context, 765 .bdrv_attach_aio_context = raw_attach_aio_context, 766 767 .bdrv_getlength = raw_getlength, 768 .has_variable_length = true, 769 770 .bdrv_get_allocated_file_size 771 = raw_get_allocated_file_size, 772 }; 773 774 static void bdrv_file_init(void) 775 { 776 bdrv_register(&bdrv_file); 777 bdrv_register(&bdrv_host_device); 778 } 779 780 block_init(bdrv_file_init); 781