block-raw-win32.c

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