The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 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-common.h" |
| 25 | #include "qemu-timer.h" |
| 26 | #include "block_int.h" |
| 27 | #include <assert.h> |
| 28 | #include <winioctl.h> |
| 29 | |
| 30 | //#define WIN32_AIO |
| 31 | |
| 32 | #define FTYPE_FILE 0 |
| 33 | #define FTYPE_CD 1 |
| 34 | #define FTYPE_HARDDISK 2 |
| 35 | |
| 36 | typedef struct BDRVRawState { |
| 37 | HANDLE hfile; |
| 38 | int type; |
| 39 | char drive_path[16]; /* format: "d:\" */ |
| 40 | } BDRVRawState; |
| 41 | |
| 42 | typedef struct RawAIOCB { |
| 43 | BlockDriverAIOCB common; |
| 44 | HANDLE hEvent; |
| 45 | OVERLAPPED ov; |
| 46 | int count; |
| 47 | } RawAIOCB; |
| 48 | |
| 49 | int qemu_ftruncate64(int fd, int64_t length) |
| 50 | { |
| 51 | LARGE_INTEGER li; |
| 52 | LONG high; |
| 53 | HANDLE h; |
| 54 | BOOL res; |
| 55 | |
| 56 | if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0) |
| 57 | return -1; |
| 58 | |
| 59 | h = (HANDLE)_get_osfhandle(fd); |
| 60 | |
| 61 | /* get current position, ftruncate do not change position */ |
| 62 | li.HighPart = 0; |
| 63 | li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT); |
| 64 | if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR) |
| 65 | return -1; |
| 66 | |
| 67 | high = length >> 32; |
| 68 | if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN)) |
| 69 | return -1; |
| 70 | res = SetEndOfFile(h); |
| 71 | |
| 72 | /* back to old position */ |
| 73 | SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN); |
| 74 | return res ? 0 : -1; |
| 75 | } |
| 76 | |
| 77 | static int set_sparse(int fd) |
| 78 | { |
| 79 | DWORD returned; |
| 80 | return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE, |
| 81 | NULL, 0, NULL, 0, &returned, NULL); |
| 82 | } |
| 83 | |
| 84 | static int raw_open(BlockDriverState *bs, const char *filename, int flags) |
| 85 | { |
| 86 | BDRVRawState *s = bs->opaque; |
| 87 | int access_flags, create_flags; |
| 88 | DWORD overlapped; |
| 89 | |
| 90 | s->type = FTYPE_FILE; |
| 91 | |
| 92 | if ((flags & BDRV_O_ACCESS) == O_RDWR) { |
| 93 | access_flags = GENERIC_READ | GENERIC_WRITE; |
| 94 | } else { |
| 95 | access_flags = GENERIC_READ; |
| 96 | } |
| 97 | if (flags & BDRV_O_CREAT) { |
| 98 | create_flags = CREATE_ALWAYS; |
| 99 | } else { |
| 100 | create_flags = OPEN_EXISTING; |
| 101 | } |
| 102 | #ifdef WIN32_AIO |
| 103 | overlapped = FILE_FLAG_OVERLAPPED; |
| 104 | #else |
| 105 | overlapped = FILE_ATTRIBUTE_NORMAL; |
| 106 | #endif |
| 107 | if (flags & BDRV_O_DIRECT) |
| 108 | overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH; |
| 109 | s->hfile = CreateFile(filename, access_flags, |
| 110 | FILE_SHARE_READ, NULL, |
| 111 | create_flags, overlapped, NULL); |
| 112 | if (s->hfile == INVALID_HANDLE_VALUE) { |
| 113 | int err = GetLastError(); |
| 114 | |
| 115 | if (err == ERROR_ACCESS_DENIED) |
| 116 | return -EACCES; |
| 117 | return -1; |
| 118 | } |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | static int raw_pread(BlockDriverState *bs, int64_t offset, |
| 123 | uint8_t *buf, int count) |
| 124 | { |
| 125 | BDRVRawState *s = bs->opaque; |
| 126 | OVERLAPPED ov; |
| 127 | DWORD ret_count; |
| 128 | int ret; |
| 129 | |
| 130 | memset(&ov, 0, sizeof(ov)); |
| 131 | ov.Offset = offset; |
| 132 | ov.OffsetHigh = offset >> 32; |
| 133 | ret = ReadFile(s->hfile, buf, count, &ret_count, &ov); |
| 134 | if (!ret) { |
| 135 | #ifdef WIN32_AIO |
| 136 | ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE); |
| 137 | if (!ret) |
| 138 | return -EIO; |
| 139 | else |
| 140 | #endif |
| 141 | return ret_count; |
| 142 | } |
| 143 | return ret_count; |
| 144 | } |
| 145 | |
| 146 | static int raw_pwrite(BlockDriverState *bs, int64_t offset, |
| 147 | const uint8_t *buf, int count) |
| 148 | { |
| 149 | BDRVRawState *s = bs->opaque; |
| 150 | OVERLAPPED ov; |
| 151 | DWORD ret_count; |
| 152 | int ret; |
| 153 | |
| 154 | memset(&ov, 0, sizeof(ov)); |
| 155 | ov.Offset = offset; |
| 156 | ov.OffsetHigh = offset >> 32; |
| 157 | ret = WriteFile(s->hfile, buf, count, &ret_count, &ov); |
| 158 | if (!ret) { |
| 159 | #ifdef WIN32_AIO |
| 160 | ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE); |
| 161 | if (!ret) |
| 162 | return -EIO; |
| 163 | else |
| 164 | #endif |
| 165 | return ret_count; |
| 166 | } |
| 167 | return ret_count; |
| 168 | } |
| 169 | |
| 170 | #ifdef WIN32_AIO |
| 171 | static void raw_aio_cb(void *opaque) |
| 172 | { |
| 173 | RawAIOCB *acb = opaque; |
| 174 | BlockDriverState *bs = acb->common.bs; |
| 175 | BDRVRawState *s = bs->opaque; |
| 176 | DWORD ret_count; |
| 177 | int ret; |
| 178 | |
| 179 | ret = GetOverlappedResult(s->hfile, &acb->ov, &ret_count, TRUE); |
| 180 | if (!ret || ret_count != acb->count) { |
| 181 | acb->common.cb(acb->common.opaque, -EIO); |
| 182 | } else { |
| 183 | acb->common.cb(acb->common.opaque, 0); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | static RawAIOCB *raw_aio_setup(BlockDriverState *bs, |
| 188 | int64_t sector_num, uint8_t *buf, int nb_sectors, |
| 189 | BlockDriverCompletionFunc *cb, void *opaque) |
| 190 | { |
| 191 | RawAIOCB *acb; |
| 192 | int64_t offset; |
| 193 | |
| 194 | acb = qemu_aio_get(bs, cb, opaque); |
| 195 | if (acb->hEvent) { |
| 196 | acb->hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); |
| 197 | if (!acb->hEvent) { |
| 198 | qemu_aio_release(acb); |
| 199 | return NULL; |
| 200 | } |
| 201 | } |
| 202 | memset(&acb->ov, 0, sizeof(acb->ov)); |
| 203 | offset = sector_num * 512; |
| 204 | acb->ov.Offset = offset; |
| 205 | acb->ov.OffsetHigh = offset >> 32; |
| 206 | acb->ov.hEvent = acb->hEvent; |
| 207 | acb->count = nb_sectors * 512; |
| 208 | qemu_add_wait_object(acb->ov.hEvent, raw_aio_cb, acb); |
| 209 | return acb; |
| 210 | } |
| 211 | |
| 212 | static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs, |
| 213 | int64_t sector_num, uint8_t *buf, int nb_sectors, |
| 214 | BlockDriverCompletionFunc *cb, void *opaque) |
| 215 | { |
| 216 | BDRVRawState *s = bs->opaque; |
| 217 | RawAIOCB *acb; |
| 218 | int ret; |
| 219 | |
| 220 | acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque); |
| 221 | if (!acb) |
| 222 | return NULL; |
| 223 | ret = ReadFile(s->hfile, buf, acb->count, NULL, &acb->ov); |
| 224 | if (!ret) { |
| 225 | qemu_aio_release(acb); |
| 226 | return NULL; |
| 227 | } |
| 228 | qemu_aio_release(acb); |
| 229 | return (BlockDriverAIOCB *)acb; |
| 230 | } |
| 231 | |
| 232 | static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs, |
| 233 | int64_t sector_num, uint8_t *buf, int nb_sectors, |
| 234 | BlockDriverCompletionFunc *cb, void *opaque) |
| 235 | { |
| 236 | BDRVRawState *s = bs->opaque; |
| 237 | RawAIOCB *acb; |
| 238 | int ret; |
| 239 | |
| 240 | acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque); |
| 241 | if (!acb) |
| 242 | return NULL; |
| 243 | ret = WriteFile(s->hfile, buf, acb->count, NULL, &acb->ov); |
| 244 | if (!ret) { |
| 245 | qemu_aio_release(acb); |
| 246 | return NULL; |
| 247 | } |
| 248 | qemu_aio_release(acb); |
| 249 | return (BlockDriverAIOCB *)acb; |
| 250 | } |
| 251 | |
| 252 | static void raw_aio_cancel(BlockDriverAIOCB *blockacb) |
| 253 | { |
| 254 | RawAIOCB *acb = (RawAIOCB *)blockacb; |
| 255 | BlockDriverState *bs = acb->common.bs; |
| 256 | BDRVRawState *s = bs->opaque; |
| 257 | |
| 258 | qemu_del_wait_object(acb->ov.hEvent, raw_aio_cb, acb); |
| 259 | /* XXX: if more than one async I/O it is not correct */ |
| 260 | CancelIo(s->hfile); |
| 261 | qemu_aio_release(acb); |
| 262 | } |
| 263 | #endif /* #if WIN32_AIO */ |
| 264 | |
| 265 | static void raw_flush(BlockDriverState *bs) |
| 266 | { |
| 267 | BDRVRawState *s = bs->opaque; |
| 268 | FlushFileBuffers(s->hfile); |
| 269 | } |
| 270 | |
| 271 | static void raw_close(BlockDriverState *bs) |
| 272 | { |
| 273 | BDRVRawState *s = bs->opaque; |
| 274 | CloseHandle(s->hfile); |
| 275 | } |
| 276 | |
| 277 | static int raw_truncate(BlockDriverState *bs, int64_t offset) |
| 278 | { |
| 279 | BDRVRawState *s = bs->opaque; |
| 280 | DWORD low, high; |
| 281 | |
| 282 | low = offset; |
| 283 | high = offset >> 32; |
| 284 | if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN)) |
| 285 | return -EIO; |
| 286 | if (!SetEndOfFile(s->hfile)) |
| 287 | return -EIO; |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | static int64_t raw_getlength(BlockDriverState *bs) |
| 292 | { |
| 293 | BDRVRawState *s = bs->opaque; |
| 294 | LARGE_INTEGER l; |
| 295 | ULARGE_INTEGER available, total, total_free; |
| 296 | DISK_GEOMETRY_EX dg; |
| 297 | DWORD count; |
| 298 | BOOL status; |
| 299 | |
| 300 | switch(s->type) { |
| 301 | case FTYPE_FILE: |
| 302 | l.LowPart = GetFileSize(s->hfile, &l.HighPart); |
| 303 | if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR) |
| 304 | return -EIO; |
| 305 | break; |
| 306 | case FTYPE_CD: |
| 307 | if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free)) |
| 308 | return -EIO; |
| 309 | l.QuadPart = total.QuadPart; |
| 310 | break; |
| 311 | case FTYPE_HARDDISK: |
| 312 | status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX, |
| 313 | NULL, 0, &dg, sizeof(dg), &count, NULL); |
| 314 | if (status != 0) { |
| 315 | l = dg.DiskSize; |
| 316 | } |
| 317 | break; |
| 318 | default: |
| 319 | return -EIO; |
| 320 | } |
| 321 | return l.QuadPart; |
| 322 | } |
| 323 | |
| 324 | static int raw_create(const char *filename, int64_t total_size, |
| 325 | const char *backing_file, int flags) |
| 326 | { |
| 327 | int fd; |
| 328 | |
| 329 | if (flags || backing_file) |
| 330 | return -ENOTSUP; |
| 331 | |
| 332 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, |
| 333 | 0644); |
| 334 | if (fd < 0) |
| 335 | return -EIO; |
| 336 | set_sparse(fd); |
| 337 | ftruncate(fd, total_size * 512); |
| 338 | close(fd); |
| 339 | return 0; |
| 340 | } |
| 341 | |
| 342 | void qemu_aio_init(void) |
| 343 | { |
| 344 | } |
| 345 | |
| 346 | void qemu_aio_flush(void) |
| 347 | { |
| 348 | } |
| 349 | |
| 350 | void qemu_aio_wait(void) |
| 351 | { |
| 352 | qemu_bh_poll(); |
| 353 | } |
| 354 | |
| 355 | BlockDriver bdrv_raw = { |
| 356 | "raw", |
| 357 | sizeof(BDRVRawState), |
| 358 | NULL, /* no probe for protocols */ |
| 359 | raw_open, |
| 360 | NULL, |
| 361 | NULL, |
| 362 | raw_close, |
| 363 | raw_create, |
| 364 | raw_flush, |
| 365 | |
| 366 | #ifdef WIN32_AIO |
| 367 | .bdrv_aio_read = raw_aio_read, |
| 368 | .bdrv_aio_write = raw_aio_write, |
| 369 | .bdrv_aio_cancel = raw_aio_cancel, |
| 370 | .aiocb_size = sizeof(RawAIOCB); |
| 371 | #endif |
| 372 | .bdrv_pread = raw_pread, |
| 373 | .bdrv_pwrite = raw_pwrite, |
| 374 | .bdrv_truncate = raw_truncate, |
| 375 | .bdrv_getlength = raw_getlength, |
| 376 | }; |
| 377 | |
| 378 | /***********************************************/ |
| 379 | /* host device */ |
| 380 | |
| 381 | static int find_cdrom(char *cdrom_name, int cdrom_name_size) |
| 382 | { |
| 383 | char drives[256], *pdrv = drives; |
| 384 | UINT type; |
| 385 | |
| 386 | memset(drives, 0, sizeof(drives)); |
| 387 | GetLogicalDriveStrings(sizeof(drives), drives); |
| 388 | while(pdrv[0] != '\0') { |
| 389 | type = GetDriveType(pdrv); |
| 390 | switch(type) { |
| 391 | case DRIVE_CDROM: |
| 392 | snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]); |
| 393 | return 0; |
| 394 | break; |
| 395 | } |
| 396 | pdrv += lstrlen(pdrv) + 1; |
| 397 | } |
| 398 | return -1; |
| 399 | } |
| 400 | |
| 401 | static int find_device_type(BlockDriverState *bs, const char *filename) |
| 402 | { |
| 403 | BDRVRawState *s = bs->opaque; |
| 404 | UINT type; |
| 405 | const char *p; |
| 406 | |
| 407 | if (strstart(filename, "\\\\.\\", &p) || |
| 408 | strstart(filename, "//./", &p)) { |
| 409 | if (stristart(p, "PhysicalDrive", NULL)) |
| 410 | return FTYPE_HARDDISK; |
| 411 | snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]); |
| 412 | type = GetDriveType(s->drive_path); |
| 413 | if (type == DRIVE_CDROM) |
| 414 | return FTYPE_CD; |
| 415 | else |
| 416 | return FTYPE_FILE; |
| 417 | } else { |
| 418 | return FTYPE_FILE; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | static int hdev_open(BlockDriverState *bs, const char *filename, int flags) |
| 423 | { |
| 424 | BDRVRawState *s = bs->opaque; |
| 425 | int access_flags, create_flags; |
| 426 | DWORD overlapped; |
| 427 | char device_name[64]; |
| 428 | |
| 429 | if (strstart(filename, "/dev/cdrom", NULL)) { |
| 430 | if (find_cdrom(device_name, sizeof(device_name)) < 0) |
| 431 | return -ENOENT; |
| 432 | filename = device_name; |
| 433 | } else { |
| 434 | /* transform drive letters into device name */ |
| 435 | if (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 436 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 437 | filename[1] == ':' && filename[2] == '\0') { |
| 438 | snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]); |
| 439 | filename = device_name; |
| 440 | } |
| 441 | } |
| 442 | s->type = find_device_type(bs, filename); |
| 443 | |
| 444 | if ((flags & BDRV_O_ACCESS) == O_RDWR) { |
| 445 | access_flags = GENERIC_READ | GENERIC_WRITE; |
| 446 | } else { |
| 447 | access_flags = GENERIC_READ; |
| 448 | } |
| 449 | create_flags = OPEN_EXISTING; |
| 450 | |
| 451 | #ifdef WIN32_AIO |
| 452 | overlapped = FILE_FLAG_OVERLAPPED; |
| 453 | #else |
| 454 | overlapped = FILE_ATTRIBUTE_NORMAL; |
| 455 | #endif |
| 456 | if (flags & BDRV_O_DIRECT) |
| 457 | overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH; |
| 458 | s->hfile = CreateFile(filename, access_flags, |
| 459 | FILE_SHARE_READ, NULL, |
| 460 | create_flags, overlapped, NULL); |
| 461 | if (s->hfile == INVALID_HANDLE_VALUE) { |
| 462 | int err = GetLastError(); |
| 463 | |
| 464 | if (err == ERROR_ACCESS_DENIED) |
| 465 | return -EACCES; |
| 466 | return -1; |
| 467 | } |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | #if 0 |
| 472 | /***********************************************/ |
| 473 | /* removable device additional commands */ |
| 474 | |
| 475 | static int raw_is_inserted(BlockDriverState *bs) |
| 476 | { |
| 477 | return 1; |
| 478 | } |
| 479 | |
| 480 | static int raw_media_changed(BlockDriverState *bs) |
| 481 | { |
| 482 | return -ENOTSUP; |
| 483 | } |
| 484 | |
| 485 | static int raw_eject(BlockDriverState *bs, int eject_flag) |
| 486 | { |
| 487 | DWORD ret_count; |
| 488 | |
| 489 | if (s->type == FTYPE_FILE) |
| 490 | return -ENOTSUP; |
| 491 | if (eject_flag) { |
| 492 | DeviceIoControl(s->hfile, IOCTL_STORAGE_EJECT_MEDIA, |
| 493 | NULL, 0, NULL, 0, &lpBytesReturned, NULL); |
| 494 | } else { |
| 495 | DeviceIoControl(s->hfile, IOCTL_STORAGE_LOAD_MEDIA, |
| 496 | NULL, 0, NULL, 0, &lpBytesReturned, NULL); |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | static int raw_set_locked(BlockDriverState *bs, int locked) |
| 501 | { |
| 502 | return -ENOTSUP; |
| 503 | } |
| 504 | #endif |
| 505 | |
| 506 | BlockDriver bdrv_host_device = { |
| 507 | "host_device", |
| 508 | sizeof(BDRVRawState), |
| 509 | NULL, /* no probe for protocols */ |
| 510 | hdev_open, |
| 511 | NULL, |
| 512 | NULL, |
| 513 | raw_close, |
| 514 | NULL, |
| 515 | raw_flush, |
| 516 | |
| 517 | #ifdef WIN32_AIO |
| 518 | .bdrv_aio_read = raw_aio_read, |
| 519 | .bdrv_aio_write = raw_aio_write, |
| 520 | .bdrv_aio_cancel = raw_aio_cancel, |
| 521 | .aiocb_size = sizeof(RawAIOCB); |
| 522 | #endif |
| 523 | .bdrv_pread = raw_pread, |
| 524 | .bdrv_pwrite = raw_pwrite, |
| 525 | .bdrv_getlength = raw_getlength, |
| 526 | }; |