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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
44typedef 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
54typedef struct BDRVRawState {
55 HANDLE hfile;
56 int type;
57 char drive_path[16];
58 QEMUWin32AIOState *aio;
59} BDRVRawState;
60
61
62
63
64
65
66
67static 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
100static 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
111
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
146static 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
170int 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
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
198 SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
199 return res ? 0 : -1;
200}
201
202static 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
209static 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
218static 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
228static 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
247 }
248
249 if (s->drive_path[0]) {
250 GetDiskFreeSpace(s->drive_path, §orsPerCluster,
251 &dg.Geometry.BytesPerSector,
252 &freeClusters, &totalClusters);
253 bs->bl.request_alignment = dg.Geometry.BytesPerSector;
254 return;
255 }
256
257
258 bs->bl.request_alignment = 512;
259}
260
261static 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
282static void raw_parse_filename(const char *filename, QDict *options,
283 Error **errp)
284{
285 bdrv_parse_filename_strip_prefix(filename, "file:", options);
286}
287
288static 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 },
304};
305
306static bool get_aio_option(QemuOpts *opts, int flags, Error **errp)
307{
308 BlockdevAioOptions aio, aio_default;
309
310 aio_default = (flags & BDRV_O_NATIVE_AIO) ? BLOCKDEV_AIO_OPTIONS_NATIVE
311 : BLOCKDEV_AIO_OPTIONS_THREADS;
312 aio = qapi_enum_parse(&BlockdevAioOptions_lookup, qemu_opt_get(opts, "aio"),
313 aio_default, errp);
314
315 switch (aio) {
316 case BLOCKDEV_AIO_OPTIONS_NATIVE:
317 return true;
318 case BLOCKDEV_AIO_OPTIONS_THREADS:
319 return false;
320 default:
321 error_setg(errp, "Invalid AIO option");
322 }
323 return false;
324}
325
326static int raw_open(BlockDriverState *bs, QDict *options, int flags,
327 Error **errp)
328{
329 BDRVRawState *s = bs->opaque;
330 int access_flags;
331 DWORD overlapped;
332 QemuOpts *opts;
333 Error *local_err = NULL;
334 const char *filename;
335 bool use_aio;
336 int ret;
337
338 s->type = FTYPE_FILE;
339
340 opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
341 qemu_opts_absorb_qdict(opts, options, &local_err);
342 if (local_err) {
343 error_propagate(errp, local_err);
344 ret = -EINVAL;
345 goto fail;
346 }
347
348 if (qdict_get_try_bool(options, "locking", false)) {
349 error_setg(errp, "locking=on is not supported on Windows");
350 ret = -EINVAL;
351 goto fail;
352 }
353
354 filename = qemu_opt_get(opts, "filename");
355
356 use_aio = get_aio_option(opts, flags, &local_err);
357 if (local_err) {
358 error_propagate(errp, local_err);
359 ret = -EINVAL;
360 goto fail;
361 }
362
363 raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
364
365 if (filename[0] && filename[1] == ':') {
366 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", filename[0]);
367 } else if (filename[0] == '\\' && filename[1] == '\\') {
368 s->drive_path[0] = 0;
369 } else {
370
371 char buf[MAX_PATH];
372 GetCurrentDirectory(MAX_PATH, buf);
373 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", buf[0]);
374 }
375
376 s->hfile = CreateFile(filename, access_flags,
377 FILE_SHARE_READ, NULL,
378 OPEN_EXISTING, overlapped, NULL);
379 if (s->hfile == INVALID_HANDLE_VALUE) {
380 int err = GetLastError();
381
382 error_setg_win32(errp, err, "Could not open '%s'", filename);
383 if (err == ERROR_ACCESS_DENIED) {
384 ret = -EACCES;
385 } else {
386 ret = -EINVAL;
387 }
388 goto fail;
389 }
390
391 if (use_aio) {
392 s->aio = win32_aio_init();
393 if (s->aio == NULL) {
394 CloseHandle(s->hfile);
395 error_setg(errp, "Could not initialize AIO");
396 ret = -EINVAL;
397 goto fail;
398 }
399
400 ret = win32_aio_attach(s->aio, s->hfile);
401 if (ret < 0) {
402 win32_aio_cleanup(s->aio);
403 CloseHandle(s->hfile);
404 error_setg_errno(errp, -ret, "Could not enable AIO");
405 goto fail;
406 }
407
408 win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs));
409 }
410
411 ret = 0;
412fail:
413 qemu_opts_del(opts);
414 return ret;
415}
416
417static BlockAIOCB *raw_aio_preadv(BlockDriverState *bs,
418 uint64_t offset, uint64_t bytes,
419 QEMUIOVector *qiov, int flags,
420 BlockCompletionFunc *cb, void *opaque)
421{
422 BDRVRawState *s = bs->opaque;
423 if (s->aio) {
424 return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
425 cb, opaque, QEMU_AIO_READ);
426 } else {
427 return paio_submit(bs, s->hfile, offset, qiov, bytes,
428 cb, opaque, QEMU_AIO_READ);
429 }
430}
431
432static BlockAIOCB *raw_aio_pwritev(BlockDriverState *bs,
433 uint64_t offset, uint64_t bytes,
434 QEMUIOVector *qiov, int flags,
435 BlockCompletionFunc *cb, void *opaque)
436{
437 BDRVRawState *s = bs->opaque;
438 if (s->aio) {
439 return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
440 cb, opaque, QEMU_AIO_WRITE);
441 } else {
442 return paio_submit(bs, s->hfile, offset, qiov, bytes,
443 cb, opaque, QEMU_AIO_WRITE);
444 }
445}
446
447static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
448 BlockCompletionFunc *cb, void *opaque)
449{
450 BDRVRawState *s = bs->opaque;
451 return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
452}
453
454static void raw_close(BlockDriverState *bs)
455{
456 BDRVRawState *s = bs->opaque;
457
458 if (s->aio) {
459 win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
460 win32_aio_cleanup(s->aio);
461 s->aio = NULL;
462 }
463
464 CloseHandle(s->hfile);
465 if (bs->open_flags & BDRV_O_TEMPORARY) {
466 unlink(bs->filename);
467 }
468}
469
470static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
471 PreallocMode prealloc, Error **errp)
472{
473 BDRVRawState *s = bs->opaque;
474 LONG low, high;
475 DWORD dwPtrLow;
476
477 if (prealloc != PREALLOC_MODE_OFF) {
478 error_setg(errp, "Unsupported preallocation mode '%s'",
479 PreallocMode_str(prealloc));
480 return -ENOTSUP;
481 }
482
483 low = offset;
484 high = offset >> 32;
485
486
487
488
489
490 dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
491 if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
492 error_setg_win32(errp, GetLastError(), "SetFilePointer error");
493 return -EIO;
494 }
495 if (SetEndOfFile(s->hfile) == 0) {
496 error_setg_win32(errp, GetLastError(), "SetEndOfFile error");
497 return -EIO;
498 }
499 return 0;
500}
501
502static int64_t raw_getlength(BlockDriverState *bs)
503{
504 BDRVRawState *s = bs->opaque;
505 LARGE_INTEGER l;
506 ULARGE_INTEGER available, total, total_free;
507 DISK_GEOMETRY_EX dg;
508 DWORD count;
509 BOOL status;
510
511 switch(s->type) {
512 case FTYPE_FILE:
513 l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
514 if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
515 return -EIO;
516 break;
517 case FTYPE_CD:
518 if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
519 return -EIO;
520 l.QuadPart = total.QuadPart;
521 break;
522 case FTYPE_HARDDISK:
523 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
524 NULL, 0, &dg, sizeof(dg), &count, NULL);
525 if (status != 0) {
526 l = dg.DiskSize;
527 }
528 break;
529 default:
530 return -EIO;
531 }
532 return l.QuadPart;
533}
534
535static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
536{
537 typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
538 DWORD * high);
539 get_compressed_t get_compressed;
540 struct _stati64 st;
541 const char *filename = bs->filename;
542
543 get_compressed =
544 (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
545 "GetCompressedFileSizeA");
546 if (get_compressed) {
547 DWORD high, low;
548 low = get_compressed(filename, &high);
549 if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
550 return (((int64_t) high) << 32) + low;
551 }
552 }
553
554 if (_stati64(filename, &st) < 0) {
555 return -1;
556 }
557 return st.st_size;
558}
559
560static int raw_co_create(BlockdevCreateOptions *options, Error **errp)
561{
562 BlockdevCreateOptionsFile *file_opts;
563 int fd;
564
565 assert(options->driver == BLOCKDEV_DRIVER_FILE);
566 file_opts = &options->u.file;
567
568 if (file_opts->has_preallocation) {
569 error_setg(errp, "Preallocation is not supported on Windows");
570 return -EINVAL;
571 }
572 if (file_opts->has_nocow) {
573 error_setg(errp, "nocow is not supported on Windows");
574 return -EINVAL;
575 }
576
577 fd = qemu_open(file_opts->filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
578 0644);
579 if (fd < 0) {
580 error_setg_errno(errp, errno, "Could not create file");
581 return -EIO;
582 }
583 set_sparse(fd);
584 ftruncate(fd, file_opts->size);
585 qemu_close(fd);
586
587 return 0;
588}
589
590static int coroutine_fn raw_co_create_opts(const char *filename, QemuOpts *opts,
591 Error **errp)
592{
593 BlockdevCreateOptions options;
594 int64_t total_size = 0;
595
596 strstart(filename, "file:", &filename);
597
598
599 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
600 BDRV_SECTOR_SIZE);
601
602 options = (BlockdevCreateOptions) {
603 .driver = BLOCKDEV_DRIVER_FILE,
604 .u.file = {
605 .filename = (char *) filename,
606 .size = total_size,
607 .has_preallocation = false,
608 .has_nocow = false,
609 },
610 };
611 return raw_co_create(&options, errp);
612}
613
614static QemuOptsList raw_create_opts = {
615 .name = "raw-create-opts",
616 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
617 .desc = {
618 {
619 .name = BLOCK_OPT_SIZE,
620 .type = QEMU_OPT_SIZE,
621 .help = "Virtual disk size"
622 },
623 { }
624 }
625};
626
627BlockDriver bdrv_file = {
628 .format_name = "file",
629 .protocol_name = "file",
630 .instance_size = sizeof(BDRVRawState),
631 .bdrv_needs_filename = true,
632 .bdrv_parse_filename = raw_parse_filename,
633 .bdrv_file_open = raw_open,
634 .bdrv_refresh_limits = raw_probe_alignment,
635 .bdrv_close = raw_close,
636 .bdrv_co_create_opts = raw_co_create_opts,
637 .bdrv_has_zero_init = bdrv_has_zero_init_1,
638
639 .bdrv_aio_preadv = raw_aio_preadv,
640 .bdrv_aio_pwritev = raw_aio_pwritev,
641 .bdrv_aio_flush = raw_aio_flush,
642
643 .bdrv_co_truncate = raw_co_truncate,
644 .bdrv_getlength = raw_getlength,
645 .bdrv_get_allocated_file_size
646 = raw_get_allocated_file_size,
647
648 .create_opts = &raw_create_opts,
649};
650
651
652
653
654static int find_cdrom(char *cdrom_name, int cdrom_name_size)
655{
656 char drives[256], *pdrv = drives;
657 UINT type;
658
659 memset(drives, 0, sizeof(drives));
660 GetLogicalDriveStrings(sizeof(drives), drives);
661 while(pdrv[0] != '\0') {
662 type = GetDriveType(pdrv);
663 switch(type) {
664 case DRIVE_CDROM:
665 snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
666 return 0;
667 break;
668 }
669 pdrv += lstrlen(pdrv) + 1;
670 }
671 return -1;
672}
673
674static int find_device_type(BlockDriverState *bs, const char *filename)
675{
676 BDRVRawState *s = bs->opaque;
677 UINT type;
678 const char *p;
679
680 if (strstart(filename, "\\\\.\\", &p) ||
681 strstart(filename, "//./", &p)) {
682 if (stristart(p, "PhysicalDrive", NULL))
683 return FTYPE_HARDDISK;
684 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
685 type = GetDriveType(s->drive_path);
686 switch (type) {
687 case DRIVE_REMOVABLE:
688 case DRIVE_FIXED:
689 return FTYPE_HARDDISK;
690 case DRIVE_CDROM:
691 return FTYPE_CD;
692 default:
693 return FTYPE_FILE;
694 }
695 } else {
696 return FTYPE_FILE;
697 }
698}
699
700static int hdev_probe_device(const char *filename)
701{
702 if (strstart(filename, "/dev/cdrom", NULL))
703 return 100;
704 if (is_windows_drive(filename))
705 return 100;
706 return 0;
707}
708
709static void hdev_parse_filename(const char *filename, QDict *options,
710 Error **errp)
711{
712 bdrv_parse_filename_strip_prefix(filename, "host_device:", options);
713}
714
715static void hdev_refresh_limits(BlockDriverState *bs, Error **errp)
716{
717
718 bs->bl.request_alignment = 512;
719}
720
721static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
722 Error **errp)
723{
724 BDRVRawState *s = bs->opaque;
725 int access_flags, create_flags;
726 int ret = 0;
727 DWORD overlapped;
728 char device_name[64];
729
730 Error *local_err = NULL;
731 const char *filename;
732 bool use_aio;
733
734 QemuOpts *opts = qemu_opts_create(&raw_runtime_opts, NULL, 0,
735 &error_abort);
736 qemu_opts_absorb_qdict(opts, options, &local_err);
737 if (local_err) {
738 error_propagate(errp, local_err);
739 ret = -EINVAL;
740 goto done;
741 }
742
743 filename = qemu_opt_get(opts, "filename");
744
745 use_aio = get_aio_option(opts, flags, &local_err);
746 if (!local_err && use_aio) {
747 error_setg(&local_err, "AIO is not supported on Windows host devices");
748 }
749 if (local_err) {
750 error_propagate(errp, local_err);
751 ret = -EINVAL;
752 goto done;
753 }
754
755 if (strstart(filename, "/dev/cdrom", NULL)) {
756 if (find_cdrom(device_name, sizeof(device_name)) < 0) {
757 error_setg(errp, "Could not open CD-ROM drive");
758 ret = -ENOENT;
759 goto done;
760 }
761 filename = device_name;
762 } else {
763
764 if (((filename[0] >= 'a' && filename[0] <= 'z') ||
765 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
766 filename[1] == ':' && filename[2] == '\0') {
767 snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
768 filename = device_name;
769 }
770 }
771 s->type = find_device_type(bs, filename);
772
773 raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
774
775 create_flags = OPEN_EXISTING;
776
777 s->hfile = CreateFile(filename, access_flags,
778 FILE_SHARE_READ, NULL,
779 create_flags, overlapped, NULL);
780 if (s->hfile == INVALID_HANDLE_VALUE) {
781 int err = GetLastError();
782
783 if (err == ERROR_ACCESS_DENIED) {
784 ret = -EACCES;
785 } else {
786 ret = -EINVAL;
787 }
788 error_setg_errno(errp, -ret, "Could not open device");
789 goto done;
790 }
791
792done:
793 qemu_opts_del(opts);
794 return ret;
795}
796
797static BlockDriver bdrv_host_device = {
798 .format_name = "host_device",
799 .protocol_name = "host_device",
800 .instance_size = sizeof(BDRVRawState),
801 .bdrv_needs_filename = true,
802 .bdrv_parse_filename = hdev_parse_filename,
803 .bdrv_probe_device = hdev_probe_device,
804 .bdrv_file_open = hdev_open,
805 .bdrv_close = raw_close,
806 .bdrv_refresh_limits = hdev_refresh_limits,
807
808 .bdrv_aio_preadv = raw_aio_preadv,
809 .bdrv_aio_pwritev = raw_aio_pwritev,
810 .bdrv_aio_flush = raw_aio_flush,
811
812 .bdrv_detach_aio_context = raw_detach_aio_context,
813 .bdrv_attach_aio_context = raw_attach_aio_context,
814
815 .bdrv_getlength = raw_getlength,
816 .has_variable_length = true,
817
818 .bdrv_get_allocated_file_size
819 = raw_get_allocated_file_size,
820};
821
822static void bdrv_file_init(void)
823{
824 bdrv_register(&bdrv_file);
825 bdrv_register(&bdrv_host_device);
826}
827
828block_init(bdrv_file_init);
829
