util: rename qemu_open() to qemu_open_old()
[qemu.git] / 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_int.h"
29 #include "qemu/module.h"
30 #include "qemu/option.h"
31 #include "block/raw-aio.h"
32 #include "trace.h"
33 #include "block/thread-pool.h"
34 #include "qemu/iov.h"
35 #include "qapi/qmp/qdict.h"
36 #include "qapi/qmp/qstring.h"
37 #include <windows.h>
38 #include <winioctl.h>
39
40 #define FTYPE_FILE 0
41 #define FTYPE_CD 1
42 #define FTYPE_HARDDISK 2
43
44 typedef struct RawWin32AIOData {
45 BlockDriverState *bs;
46 HANDLE hfile;
47 struct iovec *aio_iov;
48 int aio_niov;
49 size_t aio_nbytes;
50 off64_t aio_offset;
51 int aio_type;
52 } RawWin32AIOData;
53
54 typedef struct BDRVRawState {
55 HANDLE hfile;
56 int type;
57 char drive_path[16]; /* format: "d:\" */
58 QEMUWin32AIOState *aio;
59 } BDRVRawState;
60
61 /*
62 * Read/writes the data to/from a given linear buffer.
63 *
64 * Returns the number of bytes handles or -errno in case of an error. Short
65 * reads are only returned if the end of the file is reached.
66 */
67 static size_t handle_aiocb_rw(RawWin32AIOData *aiocb)
68 {
69 size_t offset = 0;
70 int i;
71
72 for (i = 0; i < aiocb->aio_niov; i++) {
73 OVERLAPPED ov;
74 DWORD ret, ret_count, len;
75
76 memset(&ov, 0, sizeof(ov));
77 ov.Offset = (aiocb->aio_offset + offset);
78 ov.OffsetHigh = (aiocb->aio_offset + offset) >> 32;
79 len = aiocb->aio_iov[i].iov_len;
80 if (aiocb->aio_type & QEMU_AIO_WRITE) {
81 ret = WriteFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
82 len, &ret_count, &ov);
83 } else {
84 ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
85 len, &ret_count, &ov);
86 }
87 if (!ret) {
88 ret_count = 0;
89 }
90 if (ret_count != len) {
91 offset += ret_count;
92 break;
93 }
94 offset += len;
95 }
96
97 return offset;
98 }
99
100 static int aio_worker(void *arg)
101 {
102 RawWin32AIOData *aiocb = arg;
103 ssize_t ret = 0;
104 size_t count;
105
106 switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
107 case QEMU_AIO_READ:
108 count = handle_aiocb_rw(aiocb);
109 if (count < aiocb->aio_nbytes) {
110 /* A short read means that we have reached EOF. Pad the buffer
111 * with zeros for bytes after EOF. */
112 iov_memset(aiocb->aio_iov, aiocb->aio_niov, count,
113 0, aiocb->aio_nbytes - count);
114
115 count = aiocb->aio_nbytes;
116 }
117 if (count == aiocb->aio_nbytes) {
118 ret = 0;
119 } else {
120 ret = -EINVAL;
121 }
122 break;
123 case QEMU_AIO_WRITE:
124 count = handle_aiocb_rw(aiocb);
125 if (count == aiocb->aio_nbytes) {
126 ret = 0;
127 } else {
128 ret = -EINVAL;
129 }
130 break;
131 case QEMU_AIO_FLUSH:
132 if (!FlushFileBuffers(aiocb->hfile)) {
133 return -EIO;
134 }
135 break;
136 default:
137 fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
138 ret = -EINVAL;
139 break;
140 }
141
142 g_free(aiocb);
143 return ret;
144 }
145
146 static BlockAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
147 int64_t offset, QEMUIOVector *qiov, int count,
148 BlockCompletionFunc *cb, void *opaque, int type)
149 {
150 RawWin32AIOData *acb = g_new(RawWin32AIOData, 1);
151 ThreadPool *pool;
152
153 acb->bs = bs;
154 acb->hfile = hfile;
155 acb->aio_type = type;
156
157 if (qiov) {
158 acb->aio_iov = qiov->iov;
159 acb->aio_niov = qiov->niov;
160 assert(qiov->size == count);
161 }
162 acb->aio_nbytes = count;
163 acb->aio_offset = offset;
164
165 trace_file_paio_submit(acb, opaque, offset, count, type);
166 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
167 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
168 }
169
170 int qemu_ftruncate64(int fd, int64_t length)
171 {
172 LARGE_INTEGER li;
173 DWORD dw;
174 LONG high;
175 HANDLE h;
176 BOOL res;
177
178 if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
179 return -1;
180
181 h = (HANDLE)_get_osfhandle(fd);
182
183 /* get current position, ftruncate do not change position */
184 li.HighPart = 0;
185 li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
186 if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
187 return -1;
188 }
189
190 high = length >> 32;
191 dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
192 if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
193 return -1;
194 }
195 res = SetEndOfFile(h);
196
197 /* back to old position */
198 SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
199 return res ? 0 : -1;
200 }
201
202 static int set_sparse(int fd)
203 {
204 DWORD returned;
205 return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
206 NULL, 0, NULL, 0, &returned, NULL);
207 }
208
209 static void raw_detach_aio_context(BlockDriverState *bs)
210 {
211 BDRVRawState *s = bs->opaque;
212
213 if (s->aio) {
214 win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
215 }
216 }
217
218 static void raw_attach_aio_context(BlockDriverState *bs,
219 AioContext *new_context)
220 {
221 BDRVRawState *s = bs->opaque;
222
223 if (s->aio) {
224 win32_aio_attach_aio_context(s->aio, new_context);
225 }
226 }
227
228 static void raw_probe_alignment(BlockDriverState *bs, Error **errp)
229 {
230 BDRVRawState *s = bs->opaque;
231 DWORD sectorsPerCluster, freeClusters, totalClusters, count;
232 DISK_GEOMETRY_EX dg;
233 BOOL status;
234
235 if (s->type == FTYPE_CD) {
236 bs->bl.request_alignment = 2048;
237 return;
238 }
239 if (s->type == FTYPE_HARDDISK) {
240 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
241 NULL, 0, &dg, sizeof(dg), &count, NULL);
242 if (status != 0) {
243 bs->bl.request_alignment = dg.Geometry.BytesPerSector;
244 return;
245 }
246 /* try GetDiskFreeSpace too */
247 }
248
249 if (s->drive_path[0]) {
250 GetDiskFreeSpace(s->drive_path, &sectorsPerCluster,
251 &dg.Geometry.BytesPerSector,
252 &freeClusters, &totalClusters);
253 bs->bl.request_alignment = dg.Geometry.BytesPerSector;
254 return;
255 }
256
257 /* XXX Does Windows support AIO on less than 512-byte alignment? */
258 bs->bl.request_alignment = 512;
259 }
260
261 static void raw_parse_flags(int flags, bool use_aio, int *access_flags,
262 DWORD *overlapped)
263 {
264 assert(access_flags != NULL);
265 assert(overlapped != NULL);
266
267 if (flags & BDRV_O_RDWR) {
268 *access_flags = GENERIC_READ | GENERIC_WRITE;
269 } else {
270 *access_flags = GENERIC_READ;
271 }
272
273 *overlapped = FILE_ATTRIBUTE_NORMAL;
274 if (use_aio) {
275 *overlapped |= FILE_FLAG_OVERLAPPED;
276 }
277 if (flags & BDRV_O_NOCACHE) {
278 *overlapped |= FILE_FLAG_NO_BUFFERING;
279 }
280 }
281
282 static void raw_parse_filename(const char *filename, QDict *options,
283 Error **errp)
284 {
285 bdrv_parse_filename_strip_prefix(filename, "file:", options);
286 }
287
288 static QemuOptsList raw_runtime_opts = {
289 .name = "raw",
290 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
291 .desc = {
292 {
293 .name = "filename",
294 .type = QEMU_OPT_STRING,
295 .help = "File name of the image",
296 },
297 {
298 .name = "aio",
299 .type = QEMU_OPT_STRING,
300 .help = "host AIO implementation (threads, native)",
301 },
302 {
303 .name = "locking",
304 .type = QEMU_OPT_STRING,
305 .help = "file locking mode (on/off/auto, default: auto)",
306 },
307 { /* end of list */ }
308 },
309 };
310
311 static bool get_aio_option(QemuOpts *opts, int flags, Error **errp)
312 {
313 BlockdevAioOptions aio, aio_default;
314
315 aio_default = (flags & BDRV_O_NATIVE_AIO) ? BLOCKDEV_AIO_OPTIONS_NATIVE
316 : BLOCKDEV_AIO_OPTIONS_THREADS;
317 aio = qapi_enum_parse(&BlockdevAioOptions_lookup, qemu_opt_get(opts, "aio"),
318 aio_default, errp);
319
320 switch (aio) {
321 case BLOCKDEV_AIO_OPTIONS_NATIVE:
322 return true;
323 case BLOCKDEV_AIO_OPTIONS_THREADS:
324 return false;
325 default:
326 error_setg(errp, "Invalid AIO option");
327 }
328 return false;
329 }
330
331 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
332 Error **errp)
333 {
334 BDRVRawState *s = bs->opaque;
335 int access_flags;
336 DWORD overlapped;
337 QemuOpts *opts;
338 Error *local_err = NULL;
339 const char *filename;
340 bool use_aio;
341 OnOffAuto locking;
342 int ret;
343
344 s->type = FTYPE_FILE;
345
346 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
347 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
348 ret = -EINVAL;
349 goto fail;
350 }
351
352 locking = qapi_enum_parse(&OnOffAuto_lookup,
353 qemu_opt_get(opts, "locking"),
354 ON_OFF_AUTO_AUTO, &local_err);
355 if (local_err) {
356 error_propagate(errp, local_err);
357 ret = -EINVAL;
358 goto fail;
359 }
360 switch (locking) {
361 case ON_OFF_AUTO_ON:
362 error_setg(errp, "locking=on is not supported on Windows");
363 ret = -EINVAL;
364 goto fail;
365 case ON_OFF_AUTO_OFF:
366 case ON_OFF_AUTO_AUTO:
367 break;
368 default:
369 g_assert_not_reached();
370 }
371
372 filename = qemu_opt_get(opts, "filename");
373
374 use_aio = get_aio_option(opts, flags, &local_err);
375 if (local_err) {
376 error_propagate(errp, local_err);
377 ret = -EINVAL;
378 goto fail;
379 }
380
381 raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
382
383 if (filename[0] && filename[1] == ':') {
384 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", filename[0]);
385 } else if (filename[0] == '\\' && filename[1] == '\\') {
386 s->drive_path[0] = 0;
387 } else {
388 /* Relative path. */
389 char buf[MAX_PATH];
390 GetCurrentDirectory(MAX_PATH, buf);
391 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", buf[0]);
392 }
393
394 s->hfile = CreateFile(filename, access_flags,
395 FILE_SHARE_READ, NULL,
396 OPEN_EXISTING, overlapped, NULL);
397 if (s->hfile == INVALID_HANDLE_VALUE) {
398 int err = GetLastError();
399
400 error_setg_win32(errp, err, "Could not open '%s'", filename);
401 if (err == ERROR_ACCESS_DENIED) {
402 ret = -EACCES;
403 } else {
404 ret = -EINVAL;
405 }
406 goto fail;
407 }
408
409 if (use_aio) {
410 s->aio = win32_aio_init();
411 if (s->aio == NULL) {
412 CloseHandle(s->hfile);
413 error_setg(errp, "Could not initialize AIO");
414 ret = -EINVAL;
415 goto fail;
416 }
417
418 ret = win32_aio_attach(s->aio, s->hfile);
419 if (ret < 0) {
420 win32_aio_cleanup(s->aio);
421 CloseHandle(s->hfile);
422 error_setg_errno(errp, -ret, "Could not enable AIO");
423 goto fail;
424 }
425
426 win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs));
427 }
428
429 /* When extending regular files, we get zeros from the OS */
430 bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
431
432 ret = 0;
433 fail:
434 qemu_opts_del(opts);
435 return ret;
436 }
437
438 static BlockAIOCB *raw_aio_preadv(BlockDriverState *bs,
439 uint64_t offset, uint64_t bytes,
440 QEMUIOVector *qiov, int flags,
441 BlockCompletionFunc *cb, void *opaque)
442 {
443 BDRVRawState *s = bs->opaque;
444 if (s->aio) {
445 return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
446 cb, opaque, QEMU_AIO_READ);
447 } else {
448 return paio_submit(bs, s->hfile, offset, qiov, bytes,
449 cb, opaque, QEMU_AIO_READ);
450 }
451 }
452
453 static BlockAIOCB *raw_aio_pwritev(BlockDriverState *bs,
454 uint64_t offset, uint64_t bytes,
455 QEMUIOVector *qiov, int flags,
456 BlockCompletionFunc *cb, void *opaque)
457 {
458 BDRVRawState *s = bs->opaque;
459 if (s->aio) {
460 return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
461 cb, opaque, QEMU_AIO_WRITE);
462 } else {
463 return paio_submit(bs, s->hfile, offset, qiov, bytes,
464 cb, opaque, QEMU_AIO_WRITE);
465 }
466 }
467
468 static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
469 BlockCompletionFunc *cb, void *opaque)
470 {
471 BDRVRawState *s = bs->opaque;
472 return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
473 }
474
475 static void raw_close(BlockDriverState *bs)
476 {
477 BDRVRawState *s = bs->opaque;
478
479 if (s->aio) {
480 win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
481 win32_aio_cleanup(s->aio);
482 s->aio = NULL;
483 }
484
485 CloseHandle(s->hfile);
486 if (bs->open_flags & BDRV_O_TEMPORARY) {
487 unlink(bs->filename);
488 }
489 }
490
491 static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
492 bool exact, PreallocMode prealloc,
493 BdrvRequestFlags flags, Error **errp)
494 {
495 BDRVRawState *s = bs->opaque;
496 LONG low, high;
497 DWORD dwPtrLow;
498
499 if (prealloc != PREALLOC_MODE_OFF) {
500 error_setg(errp, "Unsupported preallocation mode '%s'",
501 PreallocMode_str(prealloc));
502 return -ENOTSUP;
503 }
504
505 low = offset;
506 high = offset >> 32;
507
508 /*
509 * An error has occurred if the return value is INVALID_SET_FILE_POINTER
510 * and GetLastError doesn't return NO_ERROR.
511 */
512 dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
513 if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
514 error_setg_win32(errp, GetLastError(), "SetFilePointer error");
515 return -EIO;
516 }
517 if (SetEndOfFile(s->hfile) == 0) {
518 error_setg_win32(errp, GetLastError(), "SetEndOfFile error");
519 return -EIO;
520 }
521 return 0;
522 }
523
524 static int64_t raw_getlength(BlockDriverState *bs)
525 {
526 BDRVRawState *s = bs->opaque;
527 LARGE_INTEGER l;
528 ULARGE_INTEGER available, total, total_free;
529 DISK_GEOMETRY_EX dg;
530 DWORD count;
531 BOOL status;
532
533 switch(s->type) {
534 case FTYPE_FILE:
535 l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
536 if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
537 return -EIO;
538 break;
539 case FTYPE_CD:
540 if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
541 return -EIO;
542 l.QuadPart = total.QuadPart;
543 break;
544 case FTYPE_HARDDISK:
545 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
546 NULL, 0, &dg, sizeof(dg), &count, NULL);
547 if (status != 0) {
548 l = dg.DiskSize;
549 }
550 break;
551 default:
552 return -EIO;
553 }
554 return l.QuadPart;
555 }
556
557 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
558 {
559 typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
560 DWORD * high);
561 get_compressed_t get_compressed;
562 struct _stati64 st;
563 const char *filename = bs->filename;
564 /* WinNT support GetCompressedFileSize to determine allocate size */
565 get_compressed =
566 (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
567 "GetCompressedFileSizeA");
568 if (get_compressed) {
569 DWORD high, low;
570 low = get_compressed(filename, &high);
571 if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
572 return (((int64_t) high) << 32) + low;
573 }
574 }
575
576 if (_stati64(filename, &st) < 0) {
577 return -1;
578 }
579 return st.st_size;
580 }
581
582 static int raw_co_create(BlockdevCreateOptions *options, Error **errp)
583 {
584 BlockdevCreateOptionsFile *file_opts;
585 int fd;
586
587 assert(options->driver == BLOCKDEV_DRIVER_FILE);
588 file_opts = &options->u.file;
589
590 if (file_opts->has_preallocation) {
591 error_setg(errp, "Preallocation is not supported on Windows");
592 return -EINVAL;
593 }
594 if (file_opts->has_nocow) {
595 error_setg(errp, "nocow is not supported on Windows");
596 return -EINVAL;
597 }
598
599 fd = qemu_open_old(file_opts->filename,
600 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
601 0644);
602 if (fd < 0) {
603 error_setg_errno(errp, errno, "Could not create file");
604 return -EIO;
605 }
606 set_sparse(fd);
607 ftruncate(fd, file_opts->size);
608 qemu_close(fd);
609
610 return 0;
611 }
612
613 static int coroutine_fn raw_co_create_opts(BlockDriver *drv,
614 const char *filename,
615 QemuOpts *opts,
616 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 QemuOptsList raw_create_opts = {
640 .name = "raw-create-opts",
641 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
642 .desc = {
643 {
644 .name = BLOCK_OPT_SIZE,
645 .type = QEMU_OPT_SIZE,
646 .help = "Virtual disk size"
647 },
648 { /* end of list */ }
649 }
650 };
651
652 BlockDriver bdrv_file = {
653 .format_name = "file",
654 .protocol_name = "file",
655 .instance_size = sizeof(BDRVRawState),
656 .bdrv_needs_filename = true,
657 .bdrv_parse_filename = raw_parse_filename,
658 .bdrv_file_open = raw_open,
659 .bdrv_refresh_limits = raw_probe_alignment,
660 .bdrv_close = raw_close,
661 .bdrv_co_create_opts = raw_co_create_opts,
662 .bdrv_has_zero_init = bdrv_has_zero_init_1,
663
664 .bdrv_aio_preadv = raw_aio_preadv,
665 .bdrv_aio_pwritev = raw_aio_pwritev,
666 .bdrv_aio_flush = raw_aio_flush,
667
668 .bdrv_co_truncate = raw_co_truncate,
669 .bdrv_getlength = raw_getlength,
670 .bdrv_get_allocated_file_size
671 = raw_get_allocated_file_size,
672
673 .create_opts = &raw_create_opts,
674 };
675
676 /***********************************************/
677 /* host device */
678
679 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
680 {
681 char drives[256], *pdrv = drives;
682 UINT type;
683
684 memset(drives, 0, sizeof(drives));
685 GetLogicalDriveStrings(sizeof(drives), drives);
686 while(pdrv[0] != '\0') {
687 type = GetDriveType(pdrv);
688 switch(type) {
689 case DRIVE_CDROM:
690 snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
691 return 0;
692 break;
693 }
694 pdrv += lstrlen(pdrv) + 1;
695 }
696 return -1;
697 }
698
699 static int find_device_type(BlockDriverState *bs, const char *filename)
700 {
701 BDRVRawState *s = bs->opaque;
702 UINT type;
703 const char *p;
704
705 if (strstart(filename, "\\\\.\\", &p) ||
706 strstart(filename, "//./", &p)) {
707 if (stristart(p, "PhysicalDrive", NULL))
708 return FTYPE_HARDDISK;
709 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
710 type = GetDriveType(s->drive_path);
711 switch (type) {
712 case DRIVE_REMOVABLE:
713 case DRIVE_FIXED:
714 return FTYPE_HARDDISK;
715 case DRIVE_CDROM:
716 return FTYPE_CD;
717 default:
718 return FTYPE_FILE;
719 }
720 } else {
721 return FTYPE_FILE;
722 }
723 }
724
725 static int hdev_probe_device(const char *filename)
726 {
727 if (strstart(filename, "/dev/cdrom", NULL))
728 return 100;
729 if (is_windows_drive(filename))
730 return 100;
731 return 0;
732 }
733
734 static void hdev_parse_filename(const char *filename, QDict *options,
735 Error **errp)
736 {
737 bdrv_parse_filename_strip_prefix(filename, "host_device:", options);
738 }
739
740 static void hdev_refresh_limits(BlockDriverState *bs, Error **errp)
741 {
742 /* XXX Does Windows support AIO on less than 512-byte alignment? */
743 bs->bl.request_alignment = 512;
744 }
745
746 static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
747 Error **errp)
748 {
749 BDRVRawState *s = bs->opaque;
750 int access_flags, create_flags;
751 int ret = 0;
752 DWORD overlapped;
753 char device_name[64];
754
755 Error *local_err = NULL;
756 const char *filename;
757 bool use_aio;
758
759 QemuOpts *opts = qemu_opts_create(&raw_runtime_opts, NULL, 0,
760 &error_abort);
761 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
762 ret = -EINVAL;
763 goto done;
764 }
765
766 filename = qemu_opt_get(opts, "filename");
767
768 use_aio = get_aio_option(opts, flags, &local_err);
769 if (!local_err && use_aio) {
770 error_setg(&local_err, "AIO is not supported on Windows host devices");
771 }
772 if (local_err) {
773 error_propagate(errp, local_err);
774 ret = -EINVAL;
775 goto done;
776 }
777
778 if (strstart(filename, "/dev/cdrom", NULL)) {
779 if (find_cdrom(device_name, sizeof(device_name)) < 0) {
780 error_setg(errp, "Could not open CD-ROM drive");
781 ret = -ENOENT;
782 goto done;
783 }
784 filename = device_name;
785 } else {
786 /* transform drive letters into device name */
787 if (((filename[0] >= 'a' && filename[0] <= 'z') ||
788 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
789 filename[1] == ':' && filename[2] == '\0') {
790 snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
791 filename = device_name;
792 }
793 }
794 s->type = find_device_type(bs, filename);
795
796 raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
797
798 create_flags = OPEN_EXISTING;
799
800 s->hfile = CreateFile(filename, access_flags,
801 FILE_SHARE_READ, NULL,
802 create_flags, overlapped, NULL);
803 if (s->hfile == INVALID_HANDLE_VALUE) {
804 int err = GetLastError();
805
806 if (err == ERROR_ACCESS_DENIED) {
807 ret = -EACCES;
808 } else {
809 ret = -EINVAL;
810 }
811 error_setg_errno(errp, -ret, "Could not open device");
812 goto done;
813 }
814
815 done:
816 qemu_opts_del(opts);
817 return ret;
818 }
819
820 static BlockDriver bdrv_host_device = {
821 .format_name = "host_device",
822 .protocol_name = "host_device",
823 .instance_size = sizeof(BDRVRawState),
824 .bdrv_needs_filename = true,
825 .bdrv_parse_filename = hdev_parse_filename,
826 .bdrv_probe_device = hdev_probe_device,
827 .bdrv_file_open = hdev_open,
828 .bdrv_close = raw_close,
829 .bdrv_refresh_limits = hdev_refresh_limits,
830
831 .bdrv_aio_preadv = raw_aio_preadv,
832 .bdrv_aio_pwritev = raw_aio_pwritev,
833 .bdrv_aio_flush = raw_aio_flush,
834
835 .bdrv_detach_aio_context = raw_detach_aio_context,
836 .bdrv_attach_aio_context = raw_attach_aio_context,
837
838 .bdrv_getlength = raw_getlength,
839 .has_variable_length = true,
840
841 .bdrv_get_allocated_file_size
842 = raw_get_allocated_file_size,
843 };
844
845 static void bdrv_file_init(void)
846 {
847 bdrv_register(&bdrv_file);
848 bdrv_register(&bdrv_host_device);
849 }
850
851 block_init(bdrv_file_init);