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 "module.h"
  28 #include <windows.h>
  29 #include <winioctl.h>
  30
  31 #define FTYPE_FILE 0
  32 #define FTYPE_CD     1
  33 #define FTYPE_HARDDISK 2
  34
  35 typedef struct BDRVRawState {
  36     HANDLE hfile;
  37     int type;
  38     char drive_path[16]; /* format: "d:\" */
  39 } BDRVRawState;
  40
  41 int qemu_ftruncate64(int fd, int64_t length)
  42 {
  43     LARGE_INTEGER li;
  44     LONG high;
  45     HANDLE h;
  46     BOOL res;
  47
  48     if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
  49         return -1;
  50
  51     h = (HANDLE)_get_osfhandle(fd);
  52
  53     /* get current position, ftruncate do not change position */
  54     li.HighPart = 0;
  55     li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
  56     if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
  57         return -1;
  58
  59     high = length >> 32;
  60     if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
  61         return -1;
  62     res = SetEndOfFile(h);
  63
  64     /* back to old position */
  65     SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
  66     return res ? 0 : -1;
  67 }
  68
  69 static int set_sparse(int fd)
  70 {
  71     DWORD returned;
  72     return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
  73                                  NULL, 0, NULL, 0, &returned, NULL);
  74 }
  75
  76 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
  77 {
  78     BDRVRawState *s = bs->opaque;
  79     int access_flags;
  80     DWORD overlapped;
  81
  82     s->type = FTYPE_FILE;
  83
  84     if (flags & BDRV_O_RDWR) {
  85         access_flags = GENERIC_READ | GENERIC_WRITE;
  86     } else {
  87         access_flags = GENERIC_READ;
  88     }
  89
  90     overlapped = FILE_ATTRIBUTE_NORMAL;
  91     if ((flags & BDRV_O_NOCACHE))
  92         overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH;
  93     else if (!(flags & BDRV_O_CACHE_WB))
  94         overlapped |= FILE_FLAG_WRITE_THROUGH;
  95     s->hfile = CreateFile(filename, access_flags,
  96                           FILE_SHARE_READ, NULL,
  97                           OPEN_EXISTING, overlapped, NULL);
  98     if (s->hfile == INVALID_HANDLE_VALUE) {
  99         int err = GetLastError();
 100
 101         if (err == ERROR_ACCESS_DENIED)
 102             return -EACCES;
 103         return -1;
 104     }
 105     return 0;
 106 }
 107
 108 static int raw_read(BlockDriverState *bs, int64_t sector_num,
 109                     uint8_t *buf, int nb_sectors)
 110 {
 111     BDRVRawState *s = bs->opaque;
 112     OVERLAPPED ov;
 113     DWORD ret_count;
 114     int ret;
 115     int64_t offset = sector_num * 512;
 116     int count = nb_sectors * 512;
 117
 118     memset(&ov, 0, sizeof(ov));
 119     ov.Offset = offset;
 120     ov.OffsetHigh = offset >> 32;
 121     ret = ReadFile(s->hfile, buf, count, &ret_count, &ov);
 122     if (!ret)
 123         return ret_count;
 124     if (ret_count == count)
 125         ret_count = 0;
 126     return ret_count;
 127 }
 128
 129 static int raw_write(BlockDriverState *bs, int64_t sector_num,
 130                      const uint8_t *buf, int nb_sectors)
 131 {
 132     BDRVRawState *s = bs->opaque;
 133     OVERLAPPED ov;
 134     DWORD ret_count;
 135     int ret;
 136     int64_t offset = sector_num * 512;
 137     int count = nb_sectors * 512;
 138
 139     memset(&ov, 0, sizeof(ov));
 140     ov.Offset = offset;
 141     ov.OffsetHigh = offset >> 32;
 142     ret = WriteFile(s->hfile, buf, count, &ret_count, &ov);
 143     if (!ret)
 144         return ret_count;
 145     if (ret_count == count)
 146         ret_count = 0;
 147     return ret_count;
 148 }
 149
 150 static void raw_flush(BlockDriverState *bs)
 151 {
 152     BDRVRawState *s = bs->opaque;
 153     FlushFileBuffers(s->hfile);
 154 }
 155
 156 static void raw_close(BlockDriverState *bs)
 157 {
 158     BDRVRawState *s = bs->opaque;
 159     CloseHandle(s->hfile);
 160 }
 161
 162 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 163 {
 164     BDRVRawState *s = bs->opaque;
 165     LONG low, high;
 166
 167     low = offset;
 168     high = offset >> 32;
 169     if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN))
 170         return -EIO;
 171     if (!SetEndOfFile(s->hfile))
 172         return -EIO;
 173     return 0;
 174 }
 175
 176 static int64_t raw_getlength(BlockDriverState *bs)
 177 {
 178     BDRVRawState *s = bs->opaque;
 179     LARGE_INTEGER l;
 180     ULARGE_INTEGER available, total, total_free;
 181     DISK_GEOMETRY_EX dg;
 182     DWORD count;
 183     BOOL status;
 184
 185     switch(s->type) {
 186     case FTYPE_FILE:
 187         l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
 188         if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 189             return -EIO;
 190         break;
 191     case FTYPE_CD:
 192         if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
 193             return -EIO;
 194         l.QuadPart = total.QuadPart;
 195         break;
 196     case FTYPE_HARDDISK:
 197         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 198                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
 199         if (status != 0) {
 200             l = dg.DiskSize;
 201         }
 202         break;
 203     default:
 204         return -EIO;
 205     }
 206     return l.QuadPart;
 207 }
 208
 209 static int raw_create(const char *filename, QEMUOptionParameter *options)
 210 {
 211     int fd;
 212     int64_t total_size = 0;
 213
 214     /* Read out options */
 215     while (options && options->name) {
 216         if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
 217             total_size = options->value.n / 512;
 218         }
 219         options++;
 220     }
 221
 222     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 223               0644);
 224     if (fd < 0)
 225         return -EIO;
 226     set_sparse(fd);
 227     ftruncate(fd, total_size * 512);
 228     close(fd);
 229     return 0;
 230 }
 231
 232 static QEMUOptionParameter raw_create_options[] = {
 233     {
 234         .name = BLOCK_OPT_SIZE,
 235         .type = OPT_SIZE,
 236         .help = "Virtual disk size"
 237     },
 238     { NULL }
 239 };
 240
 241 static BlockDriver bdrv_file = {
 242     .format_name        = "file",
 243     .protocol_name      = "file",
 244     .instance_size      = sizeof(BDRVRawState),
 245     .bdrv_file_open     = raw_open,
 246     .bdrv_close         = raw_close,
 247     .bdrv_create        = raw_create,
 248     .bdrv_flush         = raw_flush,
 249     .bdrv_read          = raw_read,
 250     .bdrv_write         = raw_write,
 251     .bdrv_truncate      = raw_truncate,
 252     .bdrv_getlength     = raw_getlength,
 253
 254     .create_options = raw_create_options,
 255 };
 256
 257 /***********************************************/
 258 /* host device */
 259
 260 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
 261 {
 262     char drives[256], *pdrv = drives;
 263     UINT type;
 264
 265     memset(drives, 0, sizeof(drives));
 266     GetLogicalDriveStrings(sizeof(drives), drives);
 267     while(pdrv[0] != '\0') {
 268         type = GetDriveType(pdrv);
 269         switch(type) {
 270         case DRIVE_CDROM:
 271             snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
 272             return 0;
 273             break;
 274         }
 275         pdrv += lstrlen(pdrv) + 1;
 276     }
 277     return -1;
 278 }
 279
 280 static int find_device_type(BlockDriverState *bs, const char *filename)
 281 {
 282     BDRVRawState *s = bs->opaque;
 283     UINT type;
 284     const char *p;
 285
 286     if (strstart(filename, "\\\\.\\", &p) ||
 287         strstart(filename, "//./", &p)) {
 288         if (stristart(p, "PhysicalDrive", NULL))
 289             return FTYPE_HARDDISK;
 290         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
 291         type = GetDriveType(s->drive_path);
 292         switch (type) {
 293         case DRIVE_REMOVABLE:
 294         case DRIVE_FIXED:
 295             return FTYPE_HARDDISK;
 296         case DRIVE_CDROM:
 297             return FTYPE_CD;
 298         default:
 299             return FTYPE_FILE;
 300         }
 301     } else {
 302         return FTYPE_FILE;
 303     }
 304 }
 305
 306 static int hdev_probe_device(const char *filename)
 307 {
 308     if (strstart(filename, "/dev/cdrom", NULL))
 309         return 100;
 310     if (is_windows_drive(filename))
 311         return 100;
 312     return 0;
 313 }
 314
 315 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 316 {
 317     BDRVRawState *s = bs->opaque;
 318     int access_flags, create_flags;
 319     DWORD overlapped;
 320     char device_name[64];
 321
 322     if (strstart(filename, "/dev/cdrom", NULL)) {
 323         if (find_cdrom(device_name, sizeof(device_name)) < 0)
 324             return -ENOENT;
 325         filename = device_name;
 326     } else {
 327         /* transform drive letters into device name */
 328         if (((filename[0] >= 'a' && filename[0] <= 'z') ||
 329              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
 330             filename[1] == ':' && filename[2] == '\0') {
 331             snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
 332             filename = device_name;
 333         }
 334     }
 335     s->type = find_device_type(bs, filename);
 336
 337     if (flags & BDRV_O_RDWR) {
 338         access_flags = GENERIC_READ | GENERIC_WRITE;
 339     } else {
 340         access_flags = GENERIC_READ;
 341     }
 342     create_flags = OPEN_EXISTING;
 343
 344     overlapped = FILE_ATTRIBUTE_NORMAL;
 345     if ((flags & BDRV_O_NOCACHE))
 346         overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH;
 347     else if (!(flags & BDRV_O_CACHE_WB))
 348         overlapped |= FILE_FLAG_WRITE_THROUGH;
 349     s->hfile = CreateFile(filename, access_flags,
 350                           FILE_SHARE_READ, NULL,
 351                           create_flags, overlapped, NULL);
 352     if (s->hfile == INVALID_HANDLE_VALUE) {
 353         int err = GetLastError();
 354
 355         if (err == ERROR_ACCESS_DENIED)
 356             return -EACCES;
 357         return -1;
 358     }
 359     return 0;
 360 }
 361
 362 #if 0
 363 /***********************************************/
 364 /* removable device additional commands */
 365
 366 static int raw_is_inserted(BlockDriverState *bs)
 367 {
 368     return 1;
 369 }
 370
 371 static int raw_media_changed(BlockDriverState *bs)
 372 {
 373     return -ENOTSUP;
 374 }
 375
 376 static int raw_eject(BlockDriverState *bs, int eject_flag)
 377 {
 378     DWORD ret_count;
 379
 380     if (s->type == FTYPE_FILE)
 381         return -ENOTSUP;
 382     if (eject_flag) {
 383         DeviceIoControl(s->hfile, IOCTL_STORAGE_EJECT_MEDIA,
 384                         NULL, 0, NULL, 0, &lpBytesReturned, NULL);
 385     } else {
 386         DeviceIoControl(s->hfile, IOCTL_STORAGE_LOAD_MEDIA,
 387                         NULL, 0, NULL, 0, &lpBytesReturned, NULL);
 388     }
 389 }
 390
 391 static int raw_set_locked(BlockDriverState *bs, int locked)
 392 {
 393     return -ENOTSUP;
 394 }
 395 #endif
 396
 397 static BlockDriver bdrv_host_device = {
 398     .format_name        = "host_device",
 399     .protocol_name      = "host_device",
 400     .instance_size      = sizeof(BDRVRawState),
 401     .bdrv_probe_device  = hdev_probe_device,
 402     .bdrv_file_open     = hdev_open,
 403     .bdrv_close         = raw_close,
 404     .bdrv_flush         = raw_flush,
 405
 406     .bdrv_read          = raw_read,
 407     .bdrv_write         = raw_write,
 408     .bdrv_getlength     = raw_getlength,
 409 };
 410
 411 static void bdrv_file_init(void)
 412 {
 413     bdrv_register(&bdrv_file);
 414     bdrv_register(&bdrv_host_device);
 415 }
 416
 417 block_init(bdrv_file_init);