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