block/file-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
  25 #include "qemu/osdep.h"
  26 #include "qapi/error.h"
  27 #include "qemu/cutils.h"
  28 #include "block/block-io.h"
  29 #include "block/block_int.h"
  30 #include "qemu/module.h"
  31 #include "qemu/option.h"
  32 #include "block/raw-aio.h"
  33 #include "trace.h"
  34 #include "block/thread-pool.h"
  35 #include "qemu/iov.h"
  36 #include "qapi/qmp/qdict.h"
  37 #include "qapi/qmp/qstring.h"
  38 #include <windows.h>
  39 #include <winioctl.h>
  40
  41 #define FTYPE_FILE 0
  42 #define FTYPE_CD     1
  43 #define FTYPE_HARDDISK 2
  44
  45 typedef struct RawWin32AIOData {
  46     BlockDriverState *bs;
  47     HANDLE hfile;
  48     struct iovec *aio_iov;
  49     int aio_niov;
  50     size_t aio_nbytes;
  51     off64_t aio_offset;
  52     int aio_type;
  53 } RawWin32AIOData;
  54
  55 typedef struct BDRVRawState {
  56     HANDLE hfile;
  57     int type;
  58     char drive_path[16]; /* format: "d:\" */
  59     QEMUWin32AIOState *aio;
  60 } BDRVRawState;
  61
  62 typedef struct BDRVRawReopenState {
  63     HANDLE hfile;
  64 } BDRVRawReopenState;
  65
  66 /*
  67  * Read/writes the data to/from a given linear buffer.
  68  *
  69  * Returns the number of bytes handles or -errno in case of an error. Short
  70  * reads are only returned if the end of the file is reached.
  71  */
  72 static size_t handle_aiocb_rw(RawWin32AIOData *aiocb)
  73 {
  74     size_t offset = 0;
  75     int i;
  76
  77     for (i = 0; i < aiocb->aio_niov; i++) {
  78         OVERLAPPED ov;
  79         DWORD ret, ret_count, len;
  80
  81         memset(&ov, 0, sizeof(ov));
  82         ov.Offset = (aiocb->aio_offset + offset);
  83         ov.OffsetHigh = (aiocb->aio_offset + offset) >> 32;
  84         len = aiocb->aio_iov[i].iov_len;
  85         if (aiocb->aio_type & QEMU_AIO_WRITE) {
  86             ret = WriteFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
  87                             len, &ret_count, &ov);
  88         } else {
  89             ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
  90                            len, &ret_count, &ov);
  91         }
  92         if (!ret) {
  93             ret_count = 0;
  94         }
  95         if (ret_count != len) {
  96             offset += ret_count;
  97             break;
  98         }
  99         offset += len;
 100     }
 101
 102     return offset;
 103 }
 104
 105 static int aio_worker(void *arg)
 106 {
 107     RawWin32AIOData *aiocb = arg;
 108     ssize_t ret = 0;
 109     size_t count;
 110
 111     switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
 112     case QEMU_AIO_READ:
 113         count = handle_aiocb_rw(aiocb);
 114         if (count < aiocb->aio_nbytes) {
 115             /* A short read means that we have reached EOF. Pad the buffer
 116              * with zeros for bytes after EOF. */
 117             iov_memset(aiocb->aio_iov, aiocb->aio_niov, count,
 118                       0, aiocb->aio_nbytes - count);
 119
 120             count = aiocb->aio_nbytes;
 121         }
 122         if (count == aiocb->aio_nbytes) {
 123             ret = 0;
 124         } else {
 125             ret = -EINVAL;
 126         }
 127         break;
 128     case QEMU_AIO_WRITE:
 129         count = handle_aiocb_rw(aiocb);
 130         if (count == aiocb->aio_nbytes) {
 131             ret = 0;
 132         } else {
 133             ret = -EINVAL;
 134         }
 135         break;
 136     case QEMU_AIO_FLUSH:
 137         if (!FlushFileBuffers(aiocb->hfile)) {
 138             return -EIO;
 139         }
 140         break;
 141     default:
 142         fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
 143         ret = -EINVAL;
 144         break;
 145     }
 146
 147     g_free(aiocb);
 148     return ret;
 149 }
 150
 151 static BlockAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
 152         int64_t offset, QEMUIOVector *qiov, int count,
 153         BlockCompletionFunc *cb, void *opaque, int type)
 154 {
 155     RawWin32AIOData *acb = g_new(RawWin32AIOData, 1);
 156
 157     acb->bs = bs;
 158     acb->hfile = hfile;
 159     acb->aio_type = type;
 160
 161     if (qiov) {
 162         acb->aio_iov = qiov->iov;
 163         acb->aio_niov = qiov->niov;
 164         assert(qiov->size == count);
 165     }
 166     acb->aio_nbytes = count;
 167     acb->aio_offset = offset;
 168
 169     trace_file_paio_submit(acb, opaque, offset, count, type);
 170     return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
 171 }
 172
 173 int qemu_ftruncate64(int fd, int64_t length)
 174 {
 175     LARGE_INTEGER li;
 176     DWORD dw;
 177     LONG high;
 178     HANDLE h;
 179     BOOL res;
 180
 181     if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
 182         return -1;
 183
 184     h = (HANDLE)_get_osfhandle(fd);
 185
 186     /* get current position, ftruncate do not change position */
 187     li.HighPart = 0;
 188     li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
 189     if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 190         return -1;
 191     }
 192
 193     high = length >> 32;
 194     dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
 195     if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 196         return -1;
 197     }
 198     res = SetEndOfFile(h);
 199
 200     /* back to old position */
 201     SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
 202     return res ? 0 : -1;
 203 }
 204
 205 static int set_sparse(int fd)
 206 {
 207     DWORD returned;
 208     return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
 209                                  NULL, 0, NULL, 0, &returned, NULL);
 210 }
 211
 212 static void raw_detach_aio_context(BlockDriverState *bs)
 213 {
 214     BDRVRawState *s = bs->opaque;
 215
 216     if (s->aio) {
 217         win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
 218     }
 219 }
 220
 221 static void raw_attach_aio_context(BlockDriverState *bs,
 222                                    AioContext *new_context)
 223 {
 224     BDRVRawState *s = bs->opaque;
 225
 226     if (s->aio) {
 227         win32_aio_attach_aio_context(s->aio, new_context);
 228     }
 229 }
 230
 231 static void raw_probe_alignment(BlockDriverState *bs, Error **errp)
 232 {
 233     BDRVRawState *s = bs->opaque;
 234     DWORD sectorsPerCluster, freeClusters, totalClusters, count;
 235     DISK_GEOMETRY_EX dg;
 236     BOOL status;
 237
 238     if (s->type == FTYPE_CD) {
 239         bs->bl.request_alignment = 2048;
 240         return;
 241     }
 242     if (s->type == FTYPE_HARDDISK) {
 243         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 244                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
 245         if (status != 0) {
 246             bs->bl.request_alignment = dg.Geometry.BytesPerSector;
 247             return;
 248         }
 249         /* try GetDiskFreeSpace too */
 250     }
 251
 252     if (s->drive_path[0]) {
 253         GetDiskFreeSpace(s->drive_path, &sectorsPerCluster,
 254                          &dg.Geometry.BytesPerSector,
 255                          &freeClusters, &totalClusters);
 256         bs->bl.request_alignment = dg.Geometry.BytesPerSector;
 257         return;
 258     }
 259
 260     /* XXX Does Windows support AIO on less than 512-byte alignment? */
 261     bs->bl.request_alignment = 512;
 262 }
 263
 264 static void raw_parse_flags(int flags, bool use_aio, int *access_flags,
 265                             DWORD *overlapped)
 266 {
 267     assert(access_flags != NULL);
 268     assert(overlapped != NULL);
 269
 270     if (flags & BDRV_O_RDWR) {
 271         *access_flags = GENERIC_READ | GENERIC_WRITE;
 272     } else {
 273         *access_flags = GENERIC_READ;
 274     }
 275
 276     *overlapped = FILE_ATTRIBUTE_NORMAL;
 277     if (use_aio) {
 278         *overlapped |= FILE_FLAG_OVERLAPPED;
 279     }
 280     if (flags & BDRV_O_NOCACHE) {
 281         *overlapped |= FILE_FLAG_NO_BUFFERING;
 282     }
 283 }
 284
 285 static void raw_parse_filename(const char *filename, QDict *options,
 286                                Error **errp)
 287 {
 288     bdrv_parse_filename_strip_prefix(filename, "file:", options);
 289 }
 290
 291 static QemuOptsList raw_runtime_opts = {
 292     .name = "raw",
 293     .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
 294     .desc = {
 295         {
 296             .name = "filename",
 297             .type = QEMU_OPT_STRING,
 298             .help = "File name of the image",
 299         },
 300         {
 301             .name = "aio",
 302             .type = QEMU_OPT_STRING,
 303             .help = "host AIO implementation (threads, native)",
 304         },
 305         {
 306             .name = "locking",
 307             .type = QEMU_OPT_STRING,
 308             .help = "file locking mode (on/off/auto, default: auto)",
 309         },
 310         { /* end of list */ }
 311     },
 312 };
 313
 314 static bool get_aio_option(QemuOpts *opts, int flags, Error **errp)
 315 {
 316     BlockdevAioOptions aio, aio_default;
 317
 318     aio_default = (flags & BDRV_O_NATIVE_AIO) ? BLOCKDEV_AIO_OPTIONS_NATIVE
 319                                               : BLOCKDEV_AIO_OPTIONS_THREADS;
 320     aio = qapi_enum_parse(&BlockdevAioOptions_lookup, qemu_opt_get(opts, "aio"),
 321                           aio_default, errp);
 322
 323     switch (aio) {
 324     case BLOCKDEV_AIO_OPTIONS_NATIVE:
 325         return true;
 326     case BLOCKDEV_AIO_OPTIONS_THREADS:
 327         return false;
 328     default:
 329         error_setg(errp, "Invalid AIO option");
 330     }
 331     return false;
 332 }
 333
 334 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 335                     Error **errp)
 336 {
 337     BDRVRawState *s = bs->opaque;
 338     int access_flags;
 339     DWORD overlapped;
 340     QemuOpts *opts;
 341     Error *local_err = NULL;
 342     const char *filename;
 343     bool use_aio;
 344     OnOffAuto locking;
 345     int ret;
 346
 347     s->type = FTYPE_FILE;
 348
 349     opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
 350     if (!qemu_opts_absorb_qdict(opts, options, errp)) {
 351         ret = -EINVAL;
 352         goto fail;
 353     }
 354
 355     locking = qapi_enum_parse(&OnOffAuto_lookup,
 356                               qemu_opt_get(opts, "locking"),
 357                               ON_OFF_AUTO_AUTO, &local_err);
 358     if (local_err) {
 359         error_propagate(errp, local_err);
 360         ret = -EINVAL;
 361         goto fail;
 362     }
 363     switch (locking) {
 364     case ON_OFF_AUTO_ON:
 365         error_setg(errp, "locking=on is not supported on Windows");
 366         ret = -EINVAL;
 367         goto fail;
 368     case ON_OFF_AUTO_OFF:
 369     case ON_OFF_AUTO_AUTO:
 370         break;
 371     default:
 372         g_assert_not_reached();
 373     }
 374
 375     filename = qemu_opt_get(opts, "filename");
 376
 377     use_aio = get_aio_option(opts, flags, &local_err);
 378     if (local_err) {
 379         error_propagate(errp, local_err);
 380         ret = -EINVAL;
 381         goto fail;
 382     }
 383
 384     raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
 385
 386     if (filename[0] && filename[1] == ':') {
 387         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", filename[0]);
 388     } else if (filename[0] == '\\' && filename[1] == '\\') {
 389         s->drive_path[0] = 0;
 390     } else {
 391         /* Relative path.  */
 392         char buf[MAX_PATH];
 393         GetCurrentDirectory(MAX_PATH, buf);
 394         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", buf[0]);
 395     }
 396
 397     s->hfile = CreateFile(filename, access_flags,
 398                           FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
 399                           OPEN_EXISTING, overlapped, NULL);
 400     if (s->hfile == INVALID_HANDLE_VALUE) {
 401         int err = GetLastError();
 402
 403         error_setg_win32(errp, err, "Could not open '%s'", filename);
 404         if (err == ERROR_ACCESS_DENIED) {
 405             ret = -EACCES;
 406         } else {
 407             ret = -EINVAL;
 408         }
 409         goto fail;
 410     }
 411
 412     if (use_aio) {
 413         s->aio = win32_aio_init();
 414         if (s->aio == NULL) {
 415             CloseHandle(s->hfile);
 416             error_setg(errp, "Could not initialize AIO");
 417             ret = -EINVAL;
 418             goto fail;
 419         }
 420
 421         ret = win32_aio_attach(s->aio, s->hfile);
 422         if (ret < 0) {
 423             win32_aio_cleanup(s->aio);
 424             CloseHandle(s->hfile);
 425             error_setg_errno(errp, -ret, "Could not enable AIO");
 426             goto fail;
 427         }
 428
 429         win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs));
 430     }
 431
 432     /* When extending regular files, we get zeros from the OS */
 433     bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
 434
 435     ret = 0;
 436 fail:
 437     qemu_opts_del(opts);
 438     return ret;
 439 }
 440
 441 static BlockAIOCB *raw_aio_preadv(BlockDriverState *bs,
 442                                   int64_t offset, int64_t bytes,
 443                                   QEMUIOVector *qiov, BdrvRequestFlags flags,
 444                                   BlockCompletionFunc *cb, void *opaque)
 445 {
 446     BDRVRawState *s = bs->opaque;
 447     if (s->aio) {
 448         return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
 449                                 cb, opaque, QEMU_AIO_READ);
 450     } else {
 451         return paio_submit(bs, s->hfile, offset, qiov, bytes,
 452                            cb, opaque, QEMU_AIO_READ);
 453     }
 454 }
 455
 456 static BlockAIOCB *raw_aio_pwritev(BlockDriverState *bs,
 457                                    int64_t offset, int64_t bytes,
 458                                    QEMUIOVector *qiov, BdrvRequestFlags flags,
 459                                    BlockCompletionFunc *cb, void *opaque)
 460 {
 461     BDRVRawState *s = bs->opaque;
 462     if (s->aio) {
 463         return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
 464                                 cb, opaque, QEMU_AIO_WRITE);
 465     } else {
 466         return paio_submit(bs, s->hfile, offset, qiov, bytes,
 467                            cb, opaque, QEMU_AIO_WRITE);
 468     }
 469 }
 470
 471 static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
 472                          BlockCompletionFunc *cb, void *opaque)
 473 {
 474     BDRVRawState *s = bs->opaque;
 475     return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
 476 }
 477
 478 static void raw_close(BlockDriverState *bs)
 479 {
 480     BDRVRawState *s = bs->opaque;
 481
 482     if (s->aio) {
 483         win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
 484         win32_aio_cleanup(s->aio);
 485         s->aio = NULL;
 486     }
 487
 488     CloseHandle(s->hfile);
 489     if (bs->open_flags & BDRV_O_TEMPORARY) {
 490         unlink(bs->filename);
 491     }
 492 }
 493
 494 static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
 495                                         bool exact, PreallocMode prealloc,
 496                                         BdrvRequestFlags flags, Error **errp)
 497 {
 498     BDRVRawState *s = bs->opaque;
 499     LONG low, high;
 500     DWORD dwPtrLow;
 501
 502     if (prealloc != PREALLOC_MODE_OFF) {
 503         error_setg(errp, "Unsupported preallocation mode '%s'",
 504                    PreallocMode_str(prealloc));
 505         return -ENOTSUP;
 506     }
 507
 508     low = offset;
 509     high = offset >> 32;
 510
 511     /*
 512      * An error has occurred if the return value is INVALID_SET_FILE_POINTER
 513      * and GetLastError doesn't return NO_ERROR.
 514      */
 515     dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
 516     if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 517         error_setg_win32(errp, GetLastError(), "SetFilePointer error");
 518         return -EIO;
 519     }
 520     if (SetEndOfFile(s->hfile) == 0) {
 521         error_setg_win32(errp, GetLastError(), "SetEndOfFile error");
 522         return -EIO;
 523     }
 524     return 0;
 525 }
 526
 527 static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs)
 528 {
 529     BDRVRawState *s = bs->opaque;
 530     LARGE_INTEGER l;
 531     ULARGE_INTEGER available, total, total_free;
 532     DISK_GEOMETRY_EX dg;
 533     DWORD count;
 534     BOOL status;
 535
 536     switch(s->type) {
 537     case FTYPE_FILE:
 538         l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
 539         if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 540             return -EIO;
 541         break;
 542     case FTYPE_CD:
 543         if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
 544             return -EIO;
 545         l.QuadPart = total.QuadPart;
 546         break;
 547     case FTYPE_HARDDISK:
 548         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 549                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
 550         if (status != 0) {
 551             l = dg.DiskSize;
 552         }
 553         break;
 554     default:
 555         return -EIO;
 556     }
 557     return l.QuadPart;
 558 }
 559
 560 static int64_t coroutine_fn raw_co_get_allocated_file_size(BlockDriverState *bs)
 561 {
 562     typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
 563                                               DWORD * high);
 564     struct _stati64 st;
 565     const char *filename = bs->filename;
 566     /* WinNT support GetCompressedFileSize to determine allocate size */
 567 #pragma GCC diagnostic ignored "-Wcast-function-type"
 568     get_compressed_t get_compressed =
 569         (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
 570                                             "GetCompressedFileSizeA");
 571     if (get_compressed) {
 572         DWORD high, low;
 573         low = get_compressed(filename, &high);
 574         if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
 575             return (((int64_t) high) << 32) + low;
 576         }
 577     }
 578
 579     if (_stati64(filename, &st) < 0) {
 580         return -1;
 581     }
 582     return st.st_size;
 583 }
 584
 585 static int raw_co_create(BlockdevCreateOptions *options, Error **errp)
 586 {
 587     BlockdevCreateOptionsFile *file_opts;
 588     int fd;
 589
 590     assert(options->driver == BLOCKDEV_DRIVER_FILE);
 591     file_opts = &options->u.file;
 592
 593     if (file_opts->has_preallocation) {
 594         error_setg(errp, "Preallocation is not supported on Windows");
 595         return -EINVAL;
 596     }
 597     if (file_opts->has_nocow) {
 598         error_setg(errp, "nocow is not supported on Windows");
 599         return -EINVAL;
 600     }
 601
 602     fd = qemu_create(file_opts->filename, O_WRONLY | O_TRUNC | O_BINARY,
 603                      0644, errp);
 604     if (fd < 0) {
 605         return -EIO;
 606     }
 607     set_sparse(fd);
 608     ftruncate(fd, file_opts->size);
 609     qemu_close(fd);
 610
 611     return 0;
 612 }
 613
 614 static int coroutine_fn GRAPH_RDLOCK
 615 raw_co_create_opts(BlockDriver *drv, const char *filename,
 616                    QemuOpts *opts, Error **errp)
 617 {
 618     BlockdevCreateOptions options;
 619     int64_t total_size = 0;
 620
 621     strstart(filename, "file:", &filename);
 622
 623     /* Read out options */
 624     total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
 625                           BDRV_SECTOR_SIZE);
 626
 627     options = (BlockdevCreateOptions) {
 628         .driver     = BLOCKDEV_DRIVER_FILE,
 629         .u.file     = {
 630             .filename           = (char *) filename,
 631             .size               = total_size,
 632             .has_preallocation  = false,
 633             .has_nocow          = false,
 634         },
 635     };
 636     return raw_co_create(&options, errp);
 637 }
 638
 639 static int raw_reopen_prepare(BDRVReopenState *state,
 640                               BlockReopenQueue *queue, Error **errp)
 641 {
 642     BDRVRawState *s = state->bs->opaque;
 643     BDRVRawReopenState *rs;
 644     int access_flags;
 645     DWORD overlapped;
 646     int ret = 0;
 647
 648     if (s->type != FTYPE_FILE) {
 649         error_setg(errp, "Can only reopen files");
 650         return -EINVAL;
 651     }
 652
 653     rs = g_new0(BDRVRawReopenState, 1);
 654
 655     /*
 656      * We do not support changing any options (only flags). By leaving
 657      * all options in state->options, we tell the generic reopen code
 658      * that we do not support changing any of them, so it will verify
 659      * that their values did not change.
 660      */
 661
 662     raw_parse_flags(state->flags, s->aio != NULL, &access_flags, &overlapped);
 663     rs->hfile = CreateFile(state->bs->filename, access_flags,
 664                            FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
 665                            OPEN_EXISTING, overlapped, NULL);
 666
 667     if (rs->hfile == INVALID_HANDLE_VALUE) {
 668         int err = GetLastError();
 669
 670         error_setg_win32(errp, err, "Could not reopen '%s'",
 671                          state->bs->filename);
 672         if (err == ERROR_ACCESS_DENIED) {
 673             ret = -EACCES;
 674         } else {
 675             ret = -EINVAL;
 676         }
 677         goto fail;
 678     }
 679
 680     if (s->aio) {
 681         ret = win32_aio_attach(s->aio, rs->hfile);
 682         if (ret < 0) {
 683             error_setg_errno(errp, -ret, "Could not enable AIO");
 684             CloseHandle(rs->hfile);
 685             goto fail;
 686         }
 687     }
 688
 689     state->opaque = rs;
 690
 691     return 0;
 692
 693 fail:
 694     g_free(rs);
 695     state->opaque = NULL;
 696
 697     return ret;
 698 }
 699
 700 static void raw_reopen_commit(BDRVReopenState *state)
 701 {
 702     BDRVRawState *s = state->bs->opaque;
 703     BDRVRawReopenState *rs = state->opaque;
 704
 705     assert(rs != NULL);
 706
 707     CloseHandle(s->hfile);
 708     s->hfile = rs->hfile;
 709
 710     g_free(rs);
 711     state->opaque = NULL;
 712 }
 713
 714 static void raw_reopen_abort(BDRVReopenState *state)
 715 {
 716     BDRVRawReopenState *rs = state->opaque;
 717
 718     if (!rs) {
 719         return;
 720     }
 721
 722     if (rs->hfile != INVALID_HANDLE_VALUE) {
 723         CloseHandle(rs->hfile);
 724     }
 725
 726     g_free(rs);
 727     state->opaque = NULL;
 728 }
 729
 730 static QemuOptsList raw_create_opts = {
 731     .name = "raw-create-opts",
 732     .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
 733     .desc = {
 734         {
 735             .name = BLOCK_OPT_SIZE,
 736             .type = QEMU_OPT_SIZE,
 737             .help = "Virtual disk size"
 738         },
 739         { /* end of list */ }
 740     }
 741 };
 742
 743 BlockDriver bdrv_file = {
 744     .format_name        = "file",
 745     .protocol_name      = "file",
 746     .instance_size      = sizeof(BDRVRawState),
 747     .bdrv_needs_filename = true,
 748     .bdrv_parse_filename = raw_parse_filename,
 749     .bdrv_file_open     = raw_open,
 750     .bdrv_refresh_limits = raw_probe_alignment,
 751     .bdrv_close         = raw_close,
 752     .bdrv_co_create_opts = raw_co_create_opts,
 753     .bdrv_has_zero_init = bdrv_has_zero_init_1,
 754
 755     .bdrv_reopen_prepare = raw_reopen_prepare,
 756     .bdrv_reopen_commit  = raw_reopen_commit,
 757     .bdrv_reopen_abort   = raw_reopen_abort,
 758
 759     .bdrv_aio_preadv    = raw_aio_preadv,
 760     .bdrv_aio_pwritev   = raw_aio_pwritev,
 761     .bdrv_aio_flush     = raw_aio_flush,
 762
 763     .bdrv_co_truncate   = raw_co_truncate,
 764     .bdrv_co_getlength  = raw_co_getlength,
 765     .bdrv_co_get_allocated_file_size
 766                         = raw_co_get_allocated_file_size,
 767
 768     .create_opts        = &raw_create_opts,
 769 };
 770
 771 /***********************************************/
 772 /* host device */
 773
 774 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
 775 {
 776     char drives[256], *pdrv = drives;
 777     UINT type;
 778
 779     memset(drives, 0, sizeof(drives));
 780     GetLogicalDriveStrings(sizeof(drives), drives);
 781     while(pdrv[0] != '\0') {
 782         type = GetDriveType(pdrv);
 783         switch(type) {
 784         case DRIVE_CDROM:
 785             snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
 786             return 0;
 787             break;
 788         }
 789         pdrv += lstrlen(pdrv) + 1;
 790     }
 791     return -1;
 792 }
 793
 794 static int find_device_type(BlockDriverState *bs, const char *filename)
 795 {
 796     BDRVRawState *s = bs->opaque;
 797     UINT type;
 798     const char *p;
 799
 800     if (strstart(filename, "\\\\.\\", &p) ||
 801         strstart(filename, "//./", &p)) {
 802         if (stristart(p, "PhysicalDrive", NULL))
 803             return FTYPE_HARDDISK;
 804         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
 805         type = GetDriveType(s->drive_path);
 806         switch (type) {
 807         case DRIVE_REMOVABLE:
 808         case DRIVE_FIXED:
 809             return FTYPE_HARDDISK;
 810         case DRIVE_CDROM:
 811             return FTYPE_CD;
 812         default:
 813             return FTYPE_FILE;
 814         }
 815     } else {
 816         return FTYPE_FILE;
 817     }
 818 }
 819
 820 static int hdev_probe_device(const char *filename)
 821 {
 822     if (strstart(filename, "/dev/cdrom", NULL))
 823         return 100;
 824     if (is_windows_drive(filename))
 825         return 100;
 826     return 0;
 827 }
 828
 829 static void hdev_parse_filename(const char *filename, QDict *options,
 830                                 Error **errp)
 831 {
 832     bdrv_parse_filename_strip_prefix(filename, "host_device:", options);
 833 }
 834
 835 static void hdev_refresh_limits(BlockDriverState *bs, Error **errp)
 836 {
 837     /* XXX Does Windows support AIO on less than 512-byte alignment? */
 838     bs->bl.request_alignment = 512;
 839     bs->bl.has_variable_length = true;
 840 }
 841
 842 static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
 843                      Error **errp)
 844 {
 845     BDRVRawState *s = bs->opaque;
 846     int access_flags, create_flags;
 847     int ret = 0;
 848     DWORD overlapped;
 849     char device_name[64];
 850
 851     Error *local_err = NULL;
 852     const char *filename;
 853     bool use_aio;
 854
 855     QemuOpts *opts = qemu_opts_create(&raw_runtime_opts, NULL, 0,
 856                                       &error_abort);
 857     if (!qemu_opts_absorb_qdict(opts, options, errp)) {
 858         ret = -EINVAL;
 859         goto done;
 860     }
 861
 862     filename = qemu_opt_get(opts, "filename");
 863
 864     use_aio = get_aio_option(opts, flags, &local_err);
 865     if (!local_err && use_aio) {
 866         error_setg(&local_err, "AIO is not supported on Windows host devices");
 867     }
 868     if (local_err) {
 869         error_propagate(errp, local_err);
 870         ret = -EINVAL;
 871         goto done;
 872     }
 873
 874     if (strstart(filename, "/dev/cdrom", NULL)) {
 875         if (find_cdrom(device_name, sizeof(device_name)) < 0) {
 876             error_setg(errp, "Could not open CD-ROM drive");
 877             ret = -ENOENT;
 878             goto done;
 879         }
 880         filename = device_name;
 881     } else {
 882         /* transform drive letters into device name */
 883         if (((filename[0] >= 'a' && filename[0] <= 'z') ||
 884              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
 885             filename[1] == ':' && filename[2] == '\0') {
 886             snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
 887             filename = device_name;
 888         }
 889     }
 890     s->type = find_device_type(bs, filename);
 891
 892     raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
 893
 894     create_flags = OPEN_EXISTING;
 895
 896     s->hfile = CreateFile(filename, access_flags,
 897                           FILE_SHARE_READ, NULL,
 898                           create_flags, overlapped, NULL);
 899     if (s->hfile == INVALID_HANDLE_VALUE) {
 900         int err = GetLastError();
 901
 902         if (err == ERROR_ACCESS_DENIED) {
 903             ret = -EACCES;
 904         } else {
 905             ret = -EINVAL;
 906         }
 907         error_setg_errno(errp, -ret, "Could not open device");
 908         goto done;
 909     }
 910
 911 done:
 912     qemu_opts_del(opts);
 913     return ret;
 914 }
 915
 916 static BlockDriver bdrv_host_device = {
 917     .format_name        = "host_device",
 918     .protocol_name      = "host_device",
 919     .instance_size      = sizeof(BDRVRawState),
 920     .bdrv_needs_filename = true,
 921     .bdrv_parse_filename = hdev_parse_filename,
 922     .bdrv_probe_device  = hdev_probe_device,
 923     .bdrv_file_open     = hdev_open,
 924     .bdrv_close         = raw_close,
 925     .bdrv_refresh_limits = hdev_refresh_limits,
 926
 927     .bdrv_aio_preadv    = raw_aio_preadv,
 928     .bdrv_aio_pwritev   = raw_aio_pwritev,
 929     .bdrv_aio_flush     = raw_aio_flush,
 930
 931     .bdrv_detach_aio_context = raw_detach_aio_context,
 932     .bdrv_attach_aio_context = raw_attach_aio_context,
 933
 934     .bdrv_co_getlength                = raw_co_getlength,
 935     .bdrv_co_get_allocated_file_size  = raw_co_get_allocated_file_size,
 936 };
 937
 938 static void bdrv_file_init(void)
 939 {
 940     bdrv_register(&bdrv_file);
 941     bdrv_register(&bdrv_host_device);
 942 }
 943
 944 block_init(bdrv_file_init);