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/block_int.h"
  27 #include "qemu/module.h"
  28 #include "raw-aio.h"
  29 #include "trace.h"
  30 #include "block/thread-pool.h"
  31 #include "qemu/iov.h"
  32 #include <windows.h>
  33 #include <winioctl.h>
  34
  35 #define FTYPE_FILE 0
  36 #define FTYPE_CD     1
  37 #define FTYPE_HARDDISK 2
  38
  39 static QEMUWin32AIOState *aio;
  40
  41 typedef struct RawWin32AIOData {
  42     BlockDriverState *bs;
  43     HANDLE hfile;
  44     struct iovec *aio_iov;
  45     int aio_niov;
  46     size_t aio_nbytes;
  47     off64_t aio_offset;
  48     int aio_type;
  49 } RawWin32AIOData;
  50
  51 typedef struct BDRVRawState {
  52     HANDLE hfile;
  53     int type;
  54     char drive_path[16]; /* format: "d:\" */
  55     QEMUWin32AIOState *aio;
  56 } BDRVRawState;
  57
  58 /*
  59  * Read/writes the data to/from a given linear buffer.
  60  *
  61  * Returns the number of bytes handles or -errno in case of an error. Short
  62  * reads are only returned if the end of the file is reached.
  63  */
  64 static size_t handle_aiocb_rw(RawWin32AIOData *aiocb)
  65 {
  66     size_t offset = 0;
  67     int i;
  68
  69     for (i = 0; i < aiocb->aio_niov; i++) {
  70         OVERLAPPED ov;
  71         DWORD ret, ret_count, len;
  72
  73         memset(&ov, 0, sizeof(ov));
  74         ov.Offset = (aiocb->aio_offset + offset);
  75         ov.OffsetHigh = (aiocb->aio_offset + offset) >> 32;
  76         len = aiocb->aio_iov[i].iov_len;
  77         if (aiocb->aio_type & QEMU_AIO_WRITE) {
  78             ret = WriteFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
  79                             len, &ret_count, &ov);
  80         } else {
  81             ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
  82                            len, &ret_count, &ov);
  83         }
  84         if (!ret) {
  85             ret_count = 0;
  86         }
  87         if (ret_count != len) {
  88             break;
  89         }
  90         offset += len;
  91     }
  92
  93     return offset;
  94 }
  95
  96 static int aio_worker(void *arg)
  97 {
  98     RawWin32AIOData *aiocb = arg;
  99     ssize_t ret = 0;
 100     size_t count;
 101
 102     switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
 103     case QEMU_AIO_READ:
 104         count = handle_aiocb_rw(aiocb);
 105         if (count < aiocb->aio_nbytes && aiocb->bs->growable) {
 106             /* A short read means that we have reached EOF. Pad the buffer
 107              * with zeros for bytes after EOF. */
 108             iov_memset(aiocb->aio_iov, aiocb->aio_niov, count,
 109                       0, aiocb->aio_nbytes - count);
 110
 111             count = aiocb->aio_nbytes;
 112         }
 113         if (count == aiocb->aio_nbytes) {
 114             ret = 0;
 115         } else {
 116             ret = -EINVAL;
 117         }
 118         break;
 119     case QEMU_AIO_WRITE:
 120         count = handle_aiocb_rw(aiocb);
 121         if (count == aiocb->aio_nbytes) {
 122             count = 0;
 123         } else {
 124             count = -EINVAL;
 125         }
 126         break;
 127     case QEMU_AIO_FLUSH:
 128         if (!FlushFileBuffers(aiocb->hfile)) {
 129             return -EIO;
 130         }
 131         break;
 132     default:
 133         fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
 134         ret = -EINVAL;
 135         break;
 136     }
 137
 138     g_slice_free(RawWin32AIOData, aiocb);
 139     return ret;
 140 }
 141
 142 static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
 143         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 144         BlockDriverCompletionFunc *cb, void *opaque, int type)
 145 {
 146     RawWin32AIOData *acb = g_slice_new(RawWin32AIOData);
 147     ThreadPool *pool;
 148
 149     acb->bs = bs;
 150     acb->hfile = hfile;
 151     acb->aio_type = type;
 152
 153     if (qiov) {
 154         acb->aio_iov = qiov->iov;
 155         acb->aio_niov = qiov->niov;
 156     }
 157     acb->aio_nbytes = nb_sectors * 512;
 158     acb->aio_offset = sector_num * 512;
 159
 160     trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
 161     pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
 162     return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
 163 }
 164
 165 int qemu_ftruncate64(int fd, int64_t length)
 166 {
 167     LARGE_INTEGER li;
 168     DWORD dw;
 169     LONG high;
 170     HANDLE h;
 171     BOOL res;
 172
 173     if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
 174         return -1;
 175
 176     h = (HANDLE)_get_osfhandle(fd);
 177
 178     /* get current position, ftruncate do not change position */
 179     li.HighPart = 0;
 180     li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
 181     if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 182         return -1;
 183     }
 184
 185     high = length >> 32;
 186     dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
 187     if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 188         return -1;
 189     }
 190     res = SetEndOfFile(h);
 191
 192     /* back to old position */
 193     SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
 194     return res ? 0 : -1;
 195 }
 196
 197 static int set_sparse(int fd)
 198 {
 199     DWORD returned;
 200     return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
 201                                  NULL, 0, NULL, 0, &returned, NULL);
 202 }
 203
 204 static void raw_parse_flags(int flags, int *access_flags, DWORD *overlapped)
 205 {
 206     assert(access_flags != NULL);
 207     assert(overlapped != NULL);
 208
 209     if (flags & BDRV_O_RDWR) {
 210         *access_flags = GENERIC_READ | GENERIC_WRITE;
 211     } else {
 212         *access_flags = GENERIC_READ;
 213     }
 214
 215     *overlapped = FILE_ATTRIBUTE_NORMAL;
 216     if (flags & BDRV_O_NATIVE_AIO) {
 217         *overlapped |= FILE_FLAG_OVERLAPPED;
 218     }
 219     if (flags & BDRV_O_NOCACHE) {
 220         *overlapped |= FILE_FLAG_NO_BUFFERING;
 221     }
 222 }
 223
 224 static QemuOptsList raw_runtime_opts = {
 225     .name = "raw",
 226     .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
 227     .desc = {
 228         {
 229             .name = "filename",
 230             .type = QEMU_OPT_STRING,
 231             .help = "File name of the image",
 232         },
 233         { /* end of list */ }
 234     },
 235 };
 236
 237 static int raw_open(BlockDriverState *bs, QDict *options, int flags)
 238 {
 239     BDRVRawState *s = bs->opaque;
 240     int access_flags;
 241     DWORD overlapped;
 242     QemuOpts *opts;
 243     Error *local_err = NULL;
 244     const char *filename;
 245     int ret;
 246
 247     s->type = FTYPE_FILE;
 248
 249     opts = qemu_opts_create_nofail(&raw_runtime_opts);
 250     qemu_opts_absorb_qdict(opts, options, &local_err);
 251     if (error_is_set(&local_err)) {
 252         qerror_report_err(local_err);
 253         error_free(local_err);
 254         ret = -EINVAL;
 255         goto fail;
 256     }
 257
 258     filename = qemu_opt_get(opts, "filename");
 259
 260     raw_parse_flags(flags, &access_flags, &overlapped);
 261
 262     if ((flags & BDRV_O_NATIVE_AIO) && aio == NULL) {
 263         aio = win32_aio_init();
 264         if (aio == NULL) {
 265             ret = -EINVAL;
 266             goto fail;
 267         }
 268     }
 269
 270     s->hfile = CreateFile(filename, access_flags,
 271                           FILE_SHARE_READ, NULL,
 272                           OPEN_EXISTING, overlapped, NULL);
 273     if (s->hfile == INVALID_HANDLE_VALUE) {
 274         int err = GetLastError();
 275
 276         if (err == ERROR_ACCESS_DENIED) {
 277             ret = -EACCES;
 278         } else {
 279             ret = -EINVAL;
 280         }
 281         goto fail;
 282     }
 283
 284     if (flags & BDRV_O_NATIVE_AIO) {
 285         ret = win32_aio_attach(aio, s->hfile);
 286         if (ret < 0) {
 287             CloseHandle(s->hfile);
 288             goto fail;
 289         }
 290         s->aio = aio;
 291     }
 292
 293     ret = 0;
 294 fail:
 295     qemu_opts_del(opts);
 296     return ret;
 297 }
 298
 299 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
 300                          int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 301                          BlockDriverCompletionFunc *cb, void *opaque)
 302 {
 303     BDRVRawState *s = bs->opaque;
 304     if (s->aio) {
 305         return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
 306                                 nb_sectors, cb, opaque, QEMU_AIO_READ);
 307     } else {
 308         return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
 309                            cb, opaque, QEMU_AIO_READ);
 310     }
 311 }
 312
 313 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
 314                           int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 315                           BlockDriverCompletionFunc *cb, void *opaque)
 316 {
 317     BDRVRawState *s = bs->opaque;
 318     if (s->aio) {
 319         return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
 320                                 nb_sectors, cb, opaque, QEMU_AIO_WRITE);
 321     } else {
 322         return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
 323                            cb, opaque, QEMU_AIO_WRITE);
 324     }
 325 }
 326
 327 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
 328                          BlockDriverCompletionFunc *cb, void *opaque)
 329 {
 330     BDRVRawState *s = bs->opaque;
 331     return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
 332 }
 333
 334 static void raw_close(BlockDriverState *bs)
 335 {
 336     BDRVRawState *s = bs->opaque;
 337     CloseHandle(s->hfile);
 338 }
 339
 340 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 341 {
 342     BDRVRawState *s = bs->opaque;
 343     LONG low, high;
 344     DWORD dwPtrLow;
 345
 346     low = offset;
 347     high = offset >> 32;
 348
 349     /*
 350      * An error has occurred if the return value is INVALID_SET_FILE_POINTER
 351      * and GetLastError doesn't return NO_ERROR.
 352      */
 353     dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
 354     if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 355         fprintf(stderr, "SetFilePointer error: %lu\n", GetLastError());
 356         return -EIO;
 357     }
 358     if (SetEndOfFile(s->hfile) == 0) {
 359         fprintf(stderr, "SetEndOfFile error: %lu\n", GetLastError());
 360         return -EIO;
 361     }
 362     return 0;
 363 }
 364
 365 static int64_t raw_getlength(BlockDriverState *bs)
 366 {
 367     BDRVRawState *s = bs->opaque;
 368     LARGE_INTEGER l;
 369     ULARGE_INTEGER available, total, total_free;
 370     DISK_GEOMETRY_EX dg;
 371     DWORD count;
 372     BOOL status;
 373
 374     switch(s->type) {
 375     case FTYPE_FILE:
 376         l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
 377         if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 378             return -EIO;
 379         break;
 380     case FTYPE_CD:
 381         if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
 382             return -EIO;
 383         l.QuadPart = total.QuadPart;
 384         break;
 385     case FTYPE_HARDDISK:
 386         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 387                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
 388         if (status != 0) {
 389             l = dg.DiskSize;
 390         }
 391         break;
 392     default:
 393         return -EIO;
 394     }
 395     return l.QuadPart;
 396 }
 397
 398 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
 399 {
 400     typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
 401                                               DWORD * high);
 402     get_compressed_t get_compressed;
 403     struct _stati64 st;
 404     const char *filename = bs->filename;
 405     /* WinNT support GetCompressedFileSize to determine allocate size */
 406     get_compressed =
 407         (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
 408                                             "GetCompressedFileSizeA");
 409     if (get_compressed) {
 410         DWORD high, low;
 411         low = get_compressed(filename, &high);
 412         if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
 413             return (((int64_t) high) << 32) + low;
 414         }
 415     }
 416
 417     if (_stati64(filename, &st) < 0) {
 418         return -1;
 419     }
 420     return st.st_size;
 421 }
 422
 423 static int raw_create(const char *filename, QEMUOptionParameter *options)
 424 {
 425     int fd;
 426     int64_t total_size = 0;
 427
 428     /* Read out options */
 429     while (options && options->name) {
 430         if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
 431             total_size = options->value.n / 512;
 432         }
 433         options++;
 434     }
 435
 436     fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 437                    0644);
 438     if (fd < 0)
 439         return -EIO;
 440     set_sparse(fd);
 441     ftruncate(fd, total_size * 512);
 442     qemu_close(fd);
 443     return 0;
 444 }
 445
 446 static QEMUOptionParameter raw_create_options[] = {
 447     {
 448         .name = BLOCK_OPT_SIZE,
 449         .type = OPT_SIZE,
 450         .help = "Virtual disk size"
 451     },
 452     { NULL }
 453 };
 454
 455 static BlockDriver bdrv_file = {
 456     .format_name        = "file",
 457     .protocol_name      = "file",
 458     .instance_size      = sizeof(BDRVRawState),
 459     .bdrv_file_open     = raw_open,
 460     .bdrv_close         = raw_close,
 461     .bdrv_create        = raw_create,
 462
 463     .bdrv_aio_readv     = raw_aio_readv,
 464     .bdrv_aio_writev    = raw_aio_writev,
 465     .bdrv_aio_flush     = raw_aio_flush,
 466
 467     .bdrv_truncate      = raw_truncate,
 468     .bdrv_getlength     = raw_getlength,
 469     .bdrv_get_allocated_file_size
 470                         = raw_get_allocated_file_size,
 471
 472     .create_options = raw_create_options,
 473 };
 474
 475 /***********************************************/
 476 /* host device */
 477
 478 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
 479 {
 480     char drives[256], *pdrv = drives;
 481     UINT type;
 482
 483     memset(drives, 0, sizeof(drives));
 484     GetLogicalDriveStrings(sizeof(drives), drives);
 485     while(pdrv[0] != '\0') {
 486         type = GetDriveType(pdrv);
 487         switch(type) {
 488         case DRIVE_CDROM:
 489             snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
 490             return 0;
 491             break;
 492         }
 493         pdrv += lstrlen(pdrv) + 1;
 494     }
 495     return -1;
 496 }
 497
 498 static int find_device_type(BlockDriverState *bs, const char *filename)
 499 {
 500     BDRVRawState *s = bs->opaque;
 501     UINT type;
 502     const char *p;
 503
 504     if (strstart(filename, "\\\\.\\", &p) ||
 505         strstart(filename, "//./", &p)) {
 506         if (stristart(p, "PhysicalDrive", NULL))
 507             return FTYPE_HARDDISK;
 508         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
 509         type = GetDriveType(s->drive_path);
 510         switch (type) {
 511         case DRIVE_REMOVABLE:
 512         case DRIVE_FIXED:
 513             return FTYPE_HARDDISK;
 514         case DRIVE_CDROM:
 515             return FTYPE_CD;
 516         default:
 517             return FTYPE_FILE;
 518         }
 519     } else {
 520         return FTYPE_FILE;
 521     }
 522 }
 523
 524 static int hdev_probe_device(const char *filename)
 525 {
 526     if (strstart(filename, "/dev/cdrom", NULL))
 527         return 100;
 528     if (is_windows_drive(filename))
 529         return 100;
 530     return 0;
 531 }
 532
 533 static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
 534 {
 535     BDRVRawState *s = bs->opaque;
 536     int access_flags, create_flags;
 537     DWORD overlapped;
 538     char device_name[64];
 539     const char *filename = qdict_get_str(options, "filename");
 540
 541     if (strstart(filename, "/dev/cdrom", NULL)) {
 542         if (find_cdrom(device_name, sizeof(device_name)) < 0)
 543             return -ENOENT;
 544         filename = device_name;
 545     } else {
 546         /* transform drive letters into device name */
 547         if (((filename[0] >= 'a' && filename[0] <= 'z') ||
 548              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
 549             filename[1] == ':' && filename[2] == '\0') {
 550             snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
 551             filename = device_name;
 552         }
 553     }
 554     s->type = find_device_type(bs, filename);
 555
 556     raw_parse_flags(flags, &access_flags, &overlapped);
 557
 558     create_flags = OPEN_EXISTING;
 559
 560     s->hfile = CreateFile(filename, access_flags,
 561                           FILE_SHARE_READ, NULL,
 562                           create_flags, overlapped, NULL);
 563     if (s->hfile == INVALID_HANDLE_VALUE) {
 564         int err = GetLastError();
 565
 566         if (err == ERROR_ACCESS_DENIED)
 567             return -EACCES;
 568         return -1;
 569     }
 570     return 0;
 571 }
 572
 573 static int hdev_has_zero_init(BlockDriverState *bs)
 574 {
 575     return 0;
 576 }
 577
 578 static BlockDriver bdrv_host_device = {
 579     .format_name        = "host_device",
 580     .protocol_name      = "host_device",
 581     .instance_size      = sizeof(BDRVRawState),
 582     .bdrv_probe_device  = hdev_probe_device,
 583     .bdrv_file_open     = hdev_open,
 584     .bdrv_close         = raw_close,
 585     .bdrv_has_zero_init = hdev_has_zero_init,
 586
 587     .bdrv_aio_readv     = raw_aio_readv,
 588     .bdrv_aio_writev    = raw_aio_writev,
 589     .bdrv_aio_flush     = raw_aio_flush,
 590
 591     .bdrv_getlength     = raw_getlength,
 592     .bdrv_get_allocated_file_size
 593                         = raw_get_allocated_file_size,
 594 };
 595
 596 static void bdrv_file_init(void)
 597 {
 598     bdrv_register(&bdrv_file);
 599     bdrv_register(&bdrv_host_device);
 600 }
 601
 602 block_init(bdrv_file_init);