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     DWORD dw;
  45     LONG high;
  46     HANDLE h;
  47     BOOL res;
  48
  49     if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
  50         return -1;
  51
  52     h = (HANDLE)_get_osfhandle(fd);
  53
  54     /* get current position, ftruncate do not change position */
  55     li.HighPart = 0;
  56     li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
  57     if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
  58         return -1;
  59     }
  60
  61     high = length >> 32;
  62     dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
  63     if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
  64         return -1;
  65     }
  66     res = SetEndOfFile(h);
  67
  68     /* back to old position */
  69     SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
  70     return res ? 0 : -1;
  71 }
  72
  73 static int set_sparse(int fd)
  74 {
  75     DWORD returned;
  76     return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
  77                                  NULL, 0, NULL, 0, &returned, NULL);
  78 }
  79
  80 static void raw_parse_flags(int flags, int *access_flags, DWORD *overlapped)
  81 {
  82     assert(access_flags != NULL);
  83     assert(overlapped != NULL);
  84
  85     if (flags & BDRV_O_RDWR) {
  86         *access_flags = GENERIC_READ | GENERIC_WRITE;
  87     } else {
  88         *access_flags = GENERIC_READ;
  89     }
  90
  91     *overlapped = FILE_ATTRIBUTE_NORMAL;
  92     if (flags & BDRV_O_NOCACHE) {
  93         *overlapped |= FILE_FLAG_NO_BUFFERING;
  94     }
  95 }
  96
  97 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
  98 {
  99     BDRVRawState *s = bs->opaque;
 100     int access_flags;
 101     DWORD overlapped;
 102
 103     s->type = FTYPE_FILE;
 104
 105     raw_parse_flags(flags, &access_flags, &overlapped);
 106
 107     s->hfile = CreateFile(filename, access_flags,
 108                           FILE_SHARE_READ, NULL,
 109                           OPEN_EXISTING, overlapped, NULL);
 110     if (s->hfile == INVALID_HANDLE_VALUE) {
 111         int err = GetLastError();
 112
 113         if (err == ERROR_ACCESS_DENIED)
 114             return -EACCES;
 115         return -1;
 116     }
 117     return 0;
 118 }
 119
 120 static int raw_read(BlockDriverState *bs, int64_t sector_num,
 121                     uint8_t *buf, int nb_sectors)
 122 {
 123     BDRVRawState *s = bs->opaque;
 124     OVERLAPPED ov;
 125     DWORD ret_count;
 126     int ret;
 127     int64_t offset = sector_num * 512;
 128     int count = nb_sectors * 512;
 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         return ret_count;
 136     if (ret_count == count)
 137         ret_count = 0;
 138     return ret_count;
 139 }
 140
 141 static int raw_write(BlockDriverState *bs, int64_t sector_num,
 142                      const uint8_t *buf, int nb_sectors)
 143 {
 144     BDRVRawState *s = bs->opaque;
 145     OVERLAPPED ov;
 146     DWORD ret_count;
 147     int ret;
 148     int64_t offset = sector_num * 512;
 149     int count = nb_sectors * 512;
 150
 151     memset(&ov, 0, sizeof(ov));
 152     ov.Offset = offset;
 153     ov.OffsetHigh = offset >> 32;
 154     ret = WriteFile(s->hfile, buf, count, &ret_count, &ov);
 155     if (!ret)
 156         return ret_count;
 157     if (ret_count == count)
 158         ret_count = 0;
 159     return ret_count;
 160 }
 161
 162 static int raw_flush(BlockDriverState *bs)
 163 {
 164     BDRVRawState *s = bs->opaque;
 165     int ret;
 166
 167     ret = FlushFileBuffers(s->hfile);
 168     if (ret == 0) {
 169         return -EIO;
 170     }
 171
 172     return 0;
 173 }
 174
 175 static void raw_close(BlockDriverState *bs)
 176 {
 177     BDRVRawState *s = bs->opaque;
 178     CloseHandle(s->hfile);
 179 }
 180
 181 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 182 {
 183     BDRVRawState *s = bs->opaque;
 184     LONG low, high;
 185
 186     low = offset;
 187     high = offset >> 32;
 188     if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN))
 189         return -EIO;
 190     if (!SetEndOfFile(s->hfile))
 191         return -EIO;
 192     return 0;
 193 }
 194
 195 static int64_t raw_getlength(BlockDriverState *bs)
 196 {
 197     BDRVRawState *s = bs->opaque;
 198     LARGE_INTEGER l;
 199     ULARGE_INTEGER available, total, total_free;
 200     DISK_GEOMETRY_EX dg;
 201     DWORD count;
 202     BOOL status;
 203
 204     switch(s->type) {
 205     case FTYPE_FILE:
 206         l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
 207         if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 208             return -EIO;
 209         break;
 210     case FTYPE_CD:
 211         if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
 212             return -EIO;
 213         l.QuadPart = total.QuadPart;
 214         break;
 215     case FTYPE_HARDDISK:
 216         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 217                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
 218         if (status != 0) {
 219             l = dg.DiskSize;
 220         }
 221         break;
 222     default:
 223         return -EIO;
 224     }
 225     return l.QuadPart;
 226 }
 227
 228 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
 229 {
 230     typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
 231                                               DWORD * high);
 232     get_compressed_t get_compressed;
 233     struct _stati64 st;
 234     const char *filename = bs->filename;
 235     /* WinNT support GetCompressedFileSize to determine allocate size */
 236     get_compressed =
 237         (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
 238                                             "GetCompressedFileSizeA");
 239     if (get_compressed) {
 240         DWORD high, low;
 241         low = get_compressed(filename, &high);
 242         if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
 243             return (((int64_t) high) << 32) + low;
 244         }
 245     }
 246
 247     if (_stati64(filename, &st) < 0) {
 248         return -1;
 249     }
 250     return st.st_size;
 251 }
 252
 253 static int raw_create(const char *filename, QEMUOptionParameter *options)
 254 {
 255     int fd;
 256     int64_t total_size = 0;
 257
 258     /* Read out options */
 259     while (options && options->name) {
 260         if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
 261             total_size = options->value.n / 512;
 262         }
 263         options++;
 264     }
 265
 266     fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 267                    0644);
 268     if (fd < 0)
 269         return -EIO;
 270     set_sparse(fd);
 271     ftruncate(fd, total_size * 512);
 272     qemu_close(fd);
 273     return 0;
 274 }
 275
 276 static QEMUOptionParameter raw_create_options[] = {
 277     {
 278         .name = BLOCK_OPT_SIZE,
 279         .type = OPT_SIZE,
 280         .help = "Virtual disk size"
 281     },
 282     { NULL }
 283 };
 284
 285 static BlockDriver bdrv_file = {
 286     .format_name        = "file",
 287     .protocol_name      = "file",
 288     .instance_size      = sizeof(BDRVRawState),
 289     .bdrv_file_open     = raw_open,
 290     .bdrv_close         = raw_close,
 291     .bdrv_create        = raw_create,
 292
 293     .bdrv_read              = raw_read,
 294     .bdrv_write             = raw_write,
 295     .bdrv_co_flush_to_disk  = raw_flush,
 296
 297     .bdrv_truncate      = raw_truncate,
 298     .bdrv_getlength     = raw_getlength,
 299     .bdrv_get_allocated_file_size
 300                         = raw_get_allocated_file_size,
 301
 302     .create_options = raw_create_options,
 303 };
 304
 305 /***********************************************/
 306 /* host device */
 307
 308 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
 309 {
 310     char drives[256], *pdrv = drives;
 311     UINT type;
 312
 313     memset(drives, 0, sizeof(drives));
 314     GetLogicalDriveStrings(sizeof(drives), drives);
 315     while(pdrv[0] != '\0') {
 316         type = GetDriveType(pdrv);
 317         switch(type) {
 318         case DRIVE_CDROM:
 319             snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
 320             return 0;
 321             break;
 322         }
 323         pdrv += lstrlen(pdrv) + 1;
 324     }
 325     return -1;
 326 }
 327
 328 static int find_device_type(BlockDriverState *bs, const char *filename)
 329 {
 330     BDRVRawState *s = bs->opaque;
 331     UINT type;
 332     const char *p;
 333
 334     if (strstart(filename, "\\\\.\\", &p) ||
 335         strstart(filename, "//./", &p)) {
 336         if (stristart(p, "PhysicalDrive", NULL))
 337             return FTYPE_HARDDISK;
 338         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
 339         type = GetDriveType(s->drive_path);
 340         switch (type) {
 341         case DRIVE_REMOVABLE:
 342         case DRIVE_FIXED:
 343             return FTYPE_HARDDISK;
 344         case DRIVE_CDROM:
 345             return FTYPE_CD;
 346         default:
 347             return FTYPE_FILE;
 348         }
 349     } else {
 350         return FTYPE_FILE;
 351     }
 352 }
 353
 354 static int hdev_probe_device(const char *filename)
 355 {
 356     if (strstart(filename, "/dev/cdrom", NULL))
 357         return 100;
 358     if (is_windows_drive(filename))
 359         return 100;
 360     return 0;
 361 }
 362
 363 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 364 {
 365     BDRVRawState *s = bs->opaque;
 366     int access_flags, create_flags;
 367     DWORD overlapped;
 368     char device_name[64];
 369
 370     if (strstart(filename, "/dev/cdrom", NULL)) {
 371         if (find_cdrom(device_name, sizeof(device_name)) < 0)
 372             return -ENOENT;
 373         filename = device_name;
 374     } else {
 375         /* transform drive letters into device name */
 376         if (((filename[0] >= 'a' && filename[0] <= 'z') ||
 377              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
 378             filename[1] == ':' && filename[2] == '\0') {
 379             snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
 380             filename = device_name;
 381         }
 382     }
 383     s->type = find_device_type(bs, filename);
 384
 385     raw_parse_flags(flags, &access_flags, &overlapped);
 386
 387     create_flags = OPEN_EXISTING;
 388
 389     s->hfile = CreateFile(filename, access_flags,
 390                           FILE_SHARE_READ, NULL,
 391                           create_flags, overlapped, NULL);
 392     if (s->hfile == INVALID_HANDLE_VALUE) {
 393         int err = GetLastError();
 394
 395         if (err == ERROR_ACCESS_DENIED)
 396             return -EACCES;
 397         return -1;
 398     }
 399     return 0;
 400 }
 401
 402 static int hdev_has_zero_init(BlockDriverState *bs)
 403 {
 404     return 0;
 405 }
 406
 407 static BlockDriver bdrv_host_device = {
 408     .format_name        = "host_device",
 409     .protocol_name      = "host_device",
 410     .instance_size      = sizeof(BDRVRawState),
 411     .bdrv_probe_device  = hdev_probe_device,
 412     .bdrv_file_open     = hdev_open,
 413     .bdrv_close         = raw_close,
 414     .bdrv_has_zero_init = hdev_has_zero_init,
 415
 416     .bdrv_read              = raw_read,
 417     .bdrv_write             = raw_write,
 418     .bdrv_co_flush_to_disk  = raw_flush,
 419
 420     .bdrv_getlength     = raw_getlength,
 421     .bdrv_get_allocated_file_size
 422                         = raw_get_allocated_file_size,
 423 };
 424
 425 static void bdrv_file_init(void)
 426 {
 427     bdrv_register(&bdrv_file);
 428     bdrv_register(&bdrv_host_device);
 429 }
 430
 431 block_init(bdrv_file_init);