git.maemo.org Git - qemu/blob - 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 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, create_flags;
  80     DWORD overlapped;
  81
  82     s->type = FTYPE_FILE;
  83
  84     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
  85         access_flags = GENERIC_READ | GENERIC_WRITE;
  86     } else {
  87         access_flags = GENERIC_READ;
  88     }
  89     if (flags & BDRV_O_CREAT) {
  90         create_flags = CREATE_ALWAYS;
  91     } else {
  92         create_flags = OPEN_EXISTING;
  93     }
  94     overlapped = FILE_ATTRIBUTE_NORMAL;
  95     if ((flags & BDRV_O_NOCACHE))
  96         overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH;
  97     else if (!(flags & BDRV_O_CACHE_WB))
  98         overlapped |= FILE_FLAG_WRITE_THROUGH;
  99     s->hfile = CreateFile(filename, access_flags,
 100                           FILE_SHARE_READ, NULL,
 101                           create_flags, overlapped, NULL);
 102     if (s->hfile == INVALID_HANDLE_VALUE) {
 103         int err = GetLastError();
 104
 105         if (err == ERROR_ACCESS_DENIED)
 106             return -EACCES;
 107         return -1;
 108     }
 109     return 0;
 110 }
 111
 112 static int raw_read(BlockDriverState *bs, int64_t sector_num,
 113                     uint8_t *buf, int nb_sectors)
 114 {
 115     BDRVRawState *s = bs->opaque;
 116     OVERLAPPED ov;
 117     DWORD ret_count;
 118     int ret;
 119     int64_t offset = sector_num * 512;
 120     int count = nb_sectors * 512;
 121
 122     memset(&ov, 0, sizeof(ov));
 123     ov.Offset = offset;
 124     ov.OffsetHigh = offset >> 32;
 125     ret = ReadFile(s->hfile, buf, count, &ret_count, &ov);
 126     if (!ret)
 127         return ret_count;
 128     if (ret_count == count)
 129         ret_count = 0;
 130     return ret_count;
 131 }
 132
 133 static int raw_write(BlockDriverState *bs, int64_t sector_num,
 134                      const uint8_t *buf, int nb_sectors)
 135 {
 136     BDRVRawState *s = bs->opaque;
 137     OVERLAPPED ov;
 138     DWORD ret_count;
 139     int ret;
 140     int64_t offset = sector_num * 512;
 141     int count = nb_sectors * 512;
 142
 143     memset(&ov, 0, sizeof(ov));
 144     ov.Offset = offset;
 145     ov.OffsetHigh = offset >> 32;
 146     ret = WriteFile(s->hfile, buf, count, &ret_count, &ov);
 147     if (!ret)
 148         return ret_count;
 149     if (ret_count == count)
 150         ret_count = 0;
 151     return ret_count;
 152 }
 153
 154 static void raw_flush(BlockDriverState *bs)
 155 {
 156     BDRVRawState *s = bs->opaque;
 157     FlushFileBuffers(s->hfile);
 158 }
 159
 160 static void raw_close(BlockDriverState *bs)
 161 {
 162     BDRVRawState *s = bs->opaque;
 163     CloseHandle(s->hfile);
 164 }
 165
 166 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 167 {
 168     BDRVRawState *s = bs->opaque;
 169     DWORD low, high;
 170
 171     low = offset;
 172     high = offset >> 32;
 173     if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN))
 174         return -EIO;
 175     if (!SetEndOfFile(s->hfile))
 176         return -EIO;
 177     return 0;
 178 }
 179
 180 static int64_t raw_getlength(BlockDriverState *bs)
 181 {
 182     BDRVRawState *s = bs->opaque;
 183     LARGE_INTEGER l;
 184     ULARGE_INTEGER available, total, total_free;
 185     DISK_GEOMETRY_EX dg;
 186     DWORD count;
 187     BOOL status;
 188
 189     switch(s->type) {
 190     case FTYPE_FILE:
 191         l.LowPart = GetFileSize(s->hfile, &l.HighPart);
 192         if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 193             return -EIO;
 194         break;
 195     case FTYPE_CD:
 196         if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
 197             return -EIO;
 198         l.QuadPart = total.QuadPart;
 199         break;
 200     case FTYPE_HARDDISK:
 201         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 202                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
 203         if (status != 0) {
 204             l = dg.DiskSize;
 205         }
 206         break;
 207     default:
 208         return -EIO;
 209     }
 210     return l.QuadPart;
 211 }
 212
 213 static int raw_create(const char *filename, int64_t total_size,
 214                       const char *backing_file, int flags)
 215 {
 216     int fd;
 217
 218     if (flags || backing_file)
 219         return -ENOTSUP;
 220
 221     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 222               0644);
 223     if (fd < 0)
 224         return -EIO;
 225     set_sparse(fd);
 226     ftruncate(fd, total_size * 512);
 227     close(fd);
 228     return 0;
 229 }
 230
 231 BlockDriver bdrv_raw = {
 232     "raw",
 233     sizeof(BDRVRawState),
 234     NULL, /* no probe for protocols */
 235     raw_open,
 236     NULL,
 237     NULL,
 238     raw_close,
 239     raw_create,
 240     raw_flush,
 241
 242     .bdrv_read = raw_read,
 243     .bdrv_write = raw_write,
 244     .bdrv_truncate = raw_truncate,
 245     .bdrv_getlength = raw_getlength,
 246 };
 247
 248 /***********************************************/
 249 /* host device */
 250
 251 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
 252 {
 253     char drives[256], *pdrv = drives;
 254     UINT type;
 255
 256     memset(drives, 0, sizeof(drives));
 257     GetLogicalDriveStrings(sizeof(drives), drives);
 258     while(pdrv[0] != '\0') {
 259         type = GetDriveType(pdrv);
 260         switch(type) {
 261         case DRIVE_CDROM:
 262             snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
 263             return 0;
 264             break;
 265         }
 266         pdrv += lstrlen(pdrv) + 1;
 267     }
 268     return -1;
 269 }
 270
 271 static int find_device_type(BlockDriverState *bs, const char *filename)
 272 {
 273     BDRVRawState *s = bs->opaque;
 274     UINT type;
 275     const char *p;
 276
 277     if (strstart(filename, "\\\\.\\", &p) ||
 278         strstart(filename, "//./", &p)) {
 279         if (stristart(p, "PhysicalDrive", NULL))
 280             return FTYPE_HARDDISK;
 281         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
 282         type = GetDriveType(s->drive_path);
 283         if (type == DRIVE_CDROM)
 284             return FTYPE_CD;
 285         else
 286             return FTYPE_FILE;
 287     } else {
 288         return FTYPE_FILE;
 289     }
 290 }
 291
 292 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 293 {
 294     BDRVRawState *s = bs->opaque;
 295     int access_flags, create_flags;
 296     DWORD overlapped;
 297     char device_name[64];
 298
 299     if (strstart(filename, "/dev/cdrom", NULL)) {
 300         if (find_cdrom(device_name, sizeof(device_name)) < 0)
 301             return -ENOENT;
 302         filename = device_name;
 303     } else {
 304         /* transform drive letters into device name */
 305         if (((filename[0] >= 'a' && filename[0] <= 'z') ||
 306              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
 307             filename[1] == ':' && filename[2] == '\0') {
 308             snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
 309             filename = device_name;
 310         }
 311     }
 312     s->type = find_device_type(bs, filename);
 313
 314     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 315         access_flags = GENERIC_READ | GENERIC_WRITE;
 316     } else {
 317         access_flags = GENERIC_READ;
 318     }
 319     create_flags = OPEN_EXISTING;
 320
 321     overlapped = FILE_ATTRIBUTE_NORMAL;
 322     if ((flags & BDRV_O_NOCACHE))
 323         overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH;
 324     else if (!(flags & BDRV_O_CACHE_WB))
 325         overlapped |= FILE_FLAG_WRITE_THROUGH;
 326     s->hfile = CreateFile(filename, access_flags,
 327                           FILE_SHARE_READ, NULL,
 328                           create_flags, overlapped, NULL);
 329     if (s->hfile == INVALID_HANDLE_VALUE) {
 330         int err = GetLastError();
 331
 332         if (err == ERROR_ACCESS_DENIED)
 333             return -EACCES;
 334         return -1;
 335     }
 336     return 0;
 337 }
 338
 339 #if 0
 340 /***********************************************/
 341 /* removable device additional commands */
 342
 343 static int raw_is_inserted(BlockDriverState *bs)
 344 {
 345     return 1;
 346 }
 347
 348 static int raw_media_changed(BlockDriverState *bs)
 349 {
 350     return -ENOTSUP;
 351 }
 352
 353 static int raw_eject(BlockDriverState *bs, int eject_flag)
 354 {
 355     DWORD ret_count;
 356
 357     if (s->type == FTYPE_FILE)
 358         return -ENOTSUP;
 359     if (eject_flag) {
 360         DeviceIoControl(s->hfile, IOCTL_STORAGE_EJECT_MEDIA,
 361                         NULL, 0, NULL, 0, &lpBytesReturned, NULL);
 362     } else {
 363         DeviceIoControl(s->hfile, IOCTL_STORAGE_LOAD_MEDIA,
 364                         NULL, 0, NULL, 0, &lpBytesReturned, NULL);
 365     }
 366 }
 367
 368 static int raw_set_locked(BlockDriverState *bs, int locked)
 369 {
 370     return -ENOTSUP;
 371 }
 372 #endif
 373
 374 BlockDriver bdrv_host_device = {
 375     .format_name        = "host_device",
 376     .instance_size      = sizeof(BDRVRawState),
 377     .bdrv_open          = hdev_open,
 378     .bdrv_close         = raw_close,
 379     .bdrv_flush         = raw_flush,
 380
 381     .bdrv_read          = raw_read,
 382     .bdrv_write         = raw_write,
 383     .bdrv_getlength     = raw_getlength,
 384 };