error: Eliminate error_propagate() with Coccinelle, part 2
[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 { /* end of list */ }
303 },
304 };
305
306 static 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
326 static 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 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
342 ret = -EINVAL;
343 goto fail;
344 }
345
346 if (qdict_get_try_bool(options, "locking", false)) {
347 error_setg(errp, "locking=on is not supported on Windows");
348 ret = -EINVAL;
349 goto fail;
350 }
351
352 filename = qemu_opt_get(opts, "filename");
353
354 use_aio = get_aio_option(opts, flags, &local_err);
355 if (local_err) {
356 error_propagate(errp, local_err);
357 ret = -EINVAL;
358 goto fail;
359 }
360
361 raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
362
363 if (filename[0] && filename[1] == ':') {
364 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", filename[0]);
365 } else if (filename[0] == '\\' && filename[1] == '\\') {
366 s->drive_path[0] = 0;
367 } else {
368 /* Relative path. */
369 char buf[MAX_PATH];
370 GetCurrentDirectory(MAX_PATH, buf);
371 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", buf[0]);
372 }
373
374 s->hfile = CreateFile(filename, access_flags,
375 FILE_SHARE_READ, NULL,
376 OPEN_EXISTING, overlapped, NULL);
377 if (s->hfile == INVALID_HANDLE_VALUE) {
378 int err = GetLastError();
379
380 error_setg_win32(errp, err, "Could not open '%s'", filename);
381 if (err == ERROR_ACCESS_DENIED) {
382 ret = -EACCES;
383 } else {
384 ret = -EINVAL;
385 }
386 goto fail;
387 }
388
389 if (use_aio) {
390 s->aio = win32_aio_init();
391 if (s->aio == NULL) {
392 CloseHandle(s->hfile);
393 error_setg(errp, "Could not initialize AIO");
394 ret = -EINVAL;
395 goto fail;
396 }
397
398 ret = win32_aio_attach(s->aio, s->hfile);
399 if (ret < 0) {
400 win32_aio_cleanup(s->aio);
401 CloseHandle(s->hfile);
402 error_setg_errno(errp, -ret, "Could not enable AIO");
403 goto fail;
404 }
405
406 win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs));
407 }
408
409 /* When extending regular files, we get zeros from the OS */
410 bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
411
412 ret = 0;
413 fail:
414 qemu_opts_del(opts);
415 return ret;
416 }
417
418 static BlockAIOCB *raw_aio_preadv(BlockDriverState *bs,
419 uint64_t offset, uint64_t bytes,
420 QEMUIOVector *qiov, int flags,
421 BlockCompletionFunc *cb, void *opaque)
422 {
423 BDRVRawState *s = bs->opaque;
424 if (s->aio) {
425 return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
426 cb, opaque, QEMU_AIO_READ);
427 } else {
428 return paio_submit(bs, s->hfile, offset, qiov, bytes,
429 cb, opaque, QEMU_AIO_READ);
430 }
431 }
432
433 static BlockAIOCB *raw_aio_pwritev(BlockDriverState *bs,
434 uint64_t offset, uint64_t bytes,
435 QEMUIOVector *qiov, int flags,
436 BlockCompletionFunc *cb, void *opaque)
437 {
438 BDRVRawState *s = bs->opaque;
439 if (s->aio) {
440 return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
441 cb, opaque, QEMU_AIO_WRITE);
442 } else {
443 return paio_submit(bs, s->hfile, offset, qiov, bytes,
444 cb, opaque, QEMU_AIO_WRITE);
445 }
446 }
447
448 static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
449 BlockCompletionFunc *cb, void *opaque)
450 {
451 BDRVRawState *s = bs->opaque;
452 return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
453 }
454
455 static void raw_close(BlockDriverState *bs)
456 {
457 BDRVRawState *s = bs->opaque;
458
459 if (s->aio) {
460 win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
461 win32_aio_cleanup(s->aio);
462 s->aio = NULL;
463 }
464
465 CloseHandle(s->hfile);
466 if (bs->open_flags & BDRV_O_TEMPORARY) {
467 unlink(bs->filename);
468 }
469 }
470
471 static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
472 bool exact, PreallocMode prealloc,
473 BdrvRequestFlags flags, Error **errp)
474 {
475 BDRVRawState *s = bs->opaque;
476 LONG low, high;
477 DWORD dwPtrLow;
478
479 if (prealloc != PREALLOC_MODE_OFF) {
480 error_setg(errp, "Unsupported preallocation mode '%s'",
481 PreallocMode_str(prealloc));
482 return -ENOTSUP;
483 }
484
485 low = offset;
486 high = offset >> 32;
487
488 /*
489 * An error has occurred if the return value is INVALID_SET_FILE_POINTER
490 * and GetLastError doesn't return NO_ERROR.
491 */
492 dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
493 if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
494 error_setg_win32(errp, GetLastError(), "SetFilePointer error");
495 return -EIO;
496 }
497 if (SetEndOfFile(s->hfile) == 0) {
498 error_setg_win32(errp, GetLastError(), "SetEndOfFile error");
499 return -EIO;
500 }
501 return 0;
502 }
503
504 static int64_t raw_getlength(BlockDriverState *bs)
505 {
506 BDRVRawState *s = bs->opaque;
507 LARGE_INTEGER l;
508 ULARGE_INTEGER available, total, total_free;
509 DISK_GEOMETRY_EX dg;
510 DWORD count;
511 BOOL status;
512
513 switch(s->type) {
514 case FTYPE_FILE:
515 l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
516 if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
517 return -EIO;
518 break;
519 case FTYPE_CD:
520 if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
521 return -EIO;
522 l.QuadPart = total.QuadPart;
523 break;
524 case FTYPE_HARDDISK:
525 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
526 NULL, 0, &dg, sizeof(dg), &count, NULL);
527 if (status != 0) {
528 l = dg.DiskSize;
529 }
530 break;
531 default:
532 return -EIO;
533 }
534 return l.QuadPart;
535 }
536
537 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
538 {
539 typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
540 DWORD * high);
541 get_compressed_t get_compressed;
542 struct _stati64 st;
543 const char *filename = bs->filename;
544 /* WinNT support GetCompressedFileSize to determine allocate size */
545 get_compressed =
546 (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
547 "GetCompressedFileSizeA");
548 if (get_compressed) {
549 DWORD high, low;
550 low = get_compressed(filename, &high);
551 if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
552 return (((int64_t) high) << 32) + low;
553 }
554 }
555
556 if (_stati64(filename, &st) < 0) {
557 return -1;
558 }
559 return st.st_size;
560 }
561
562 static int raw_co_create(BlockdevCreateOptions *options, Error **errp)
563 {
564 BlockdevCreateOptionsFile *file_opts;
565 int fd;
566
567 assert(options->driver == BLOCKDEV_DRIVER_FILE);
568 file_opts = &options->u.file;
569
570 if (file_opts->has_preallocation) {
571 error_setg(errp, "Preallocation is not supported on Windows");
572 return -EINVAL;
573 }
574 if (file_opts->has_nocow) {
575 error_setg(errp, "nocow is not supported on Windows");
576 return -EINVAL;
577 }
578
579 fd = qemu_open(file_opts->filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
580 0644);
581 if (fd < 0) {
582 error_setg_errno(errp, errno, "Could not create file");
583 return -EIO;
584 }
585 set_sparse(fd);
586 ftruncate(fd, file_opts->size);
587 qemu_close(fd);
588
589 return 0;
590 }
591
592 static int coroutine_fn raw_co_create_opts(BlockDriver *drv,
593 const char *filename,
594 QemuOpts *opts,
595 Error **errp)
596 {
597 BlockdevCreateOptions options;
598 int64_t total_size = 0;
599
600 strstart(filename, "file:", &filename);
601
602 /* Read out options */
603 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
604 BDRV_SECTOR_SIZE);
605
606 options = (BlockdevCreateOptions) {
607 .driver = BLOCKDEV_DRIVER_FILE,
608 .u.file = {
609 .filename = (char *) filename,
610 .size = total_size,
611 .has_preallocation = false,
612 .has_nocow = false,
613 },
614 };
615 return raw_co_create(&options, errp);
616 }
617
618 static QemuOptsList raw_create_opts = {
619 .name = "raw-create-opts",
620 .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
621 .desc = {
622 {
623 .name = BLOCK_OPT_SIZE,
624 .type = QEMU_OPT_SIZE,
625 .help = "Virtual disk size"
626 },
627 { /* end of list */ }
628 }
629 };
630
631 BlockDriver bdrv_file = {
632 .format_name = "file",
633 .protocol_name = "file",
634 .instance_size = sizeof(BDRVRawState),
635 .bdrv_needs_filename = true,
636 .bdrv_parse_filename = raw_parse_filename,
637 .bdrv_file_open = raw_open,
638 .bdrv_refresh_limits = raw_probe_alignment,
639 .bdrv_close = raw_close,
640 .bdrv_co_create_opts = raw_co_create_opts,
641 .bdrv_has_zero_init = bdrv_has_zero_init_1,
642
643 .bdrv_aio_preadv = raw_aio_preadv,
644 .bdrv_aio_pwritev = raw_aio_pwritev,
645 .bdrv_aio_flush = raw_aio_flush,
646
647 .bdrv_co_truncate = raw_co_truncate,
648 .bdrv_getlength = raw_getlength,
649 .bdrv_get_allocated_file_size
650 = raw_get_allocated_file_size,
651
652 .create_opts = &raw_create_opts,
653 };
654
655 /***********************************************/
656 /* host device */
657
658 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
659 {
660 char drives[256], *pdrv = drives;
661 UINT type;
662
663 memset(drives, 0, sizeof(drives));
664 GetLogicalDriveStrings(sizeof(drives), drives);
665 while(pdrv[0] != '\0') {
666 type = GetDriveType(pdrv);
667 switch(type) {
668 case DRIVE_CDROM:
669 snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
670 return 0;
671 break;
672 }
673 pdrv += lstrlen(pdrv) + 1;
674 }
675 return -1;
676 }
677
678 static int find_device_type(BlockDriverState *bs, const char *filename)
679 {
680 BDRVRawState *s = bs->opaque;
681 UINT type;
682 const char *p;
683
684 if (strstart(filename, "\\\\.\\", &p) ||
685 strstart(filename, "//./", &p)) {
686 if (stristart(p, "PhysicalDrive", NULL))
687 return FTYPE_HARDDISK;
688 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
689 type = GetDriveType(s->drive_path);
690 switch (type) {
691 case DRIVE_REMOVABLE:
692 case DRIVE_FIXED:
693 return FTYPE_HARDDISK;
694 case DRIVE_CDROM:
695 return FTYPE_CD;
696 default:
697 return FTYPE_FILE;
698 }
699 } else {
700 return FTYPE_FILE;
701 }
702 }
703
704 static int hdev_probe_device(const char *filename)
705 {
706 if (strstart(filename, "/dev/cdrom", NULL))
707 return 100;
708 if (is_windows_drive(filename))
709 return 100;
710 return 0;
711 }
712
713 static void hdev_parse_filename(const char *filename, QDict *options,
714 Error **errp)
715 {
716 bdrv_parse_filename_strip_prefix(filename, "host_device:", options);
717 }
718
719 static void hdev_refresh_limits(BlockDriverState *bs, Error **errp)
720 {
721 /* XXX Does Windows support AIO on less than 512-byte alignment? */
722 bs->bl.request_alignment = 512;
723 }
724
725 static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
726 Error **errp)
727 {
728 BDRVRawState *s = bs->opaque;
729 int access_flags, create_flags;
730 int ret = 0;
731 DWORD overlapped;
732 char device_name[64];
733
734 Error *local_err = NULL;
735 const char *filename;
736 bool use_aio;
737
738 QemuOpts *opts = qemu_opts_create(&raw_runtime_opts, NULL, 0,
739 &error_abort);
740 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
741 ret = -EINVAL;
742 goto done;
743 }
744
745 filename = qemu_opt_get(opts, "filename");
746
747 use_aio = get_aio_option(opts, flags, &local_err);
748 if (!local_err && use_aio) {
749 error_setg(&local_err, "AIO is not supported on Windows host devices");
750 }
751 if (local_err) {
752 error_propagate(errp, local_err);
753 ret = -EINVAL;
754 goto done;
755 }
756
757 if (strstart(filename, "/dev/cdrom", NULL)) {
758 if (find_cdrom(device_name, sizeof(device_name)) < 0) {
759 error_setg(errp, "Could not open CD-ROM drive");
760 ret = -ENOENT;
761 goto done;
762 }
763 filename = device_name;
764 } else {
765 /* transform drive letters into device name */
766 if (((filename[0] >= 'a' && filename[0] <= 'z') ||
767 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
768 filename[1] == ':' && filename[2] == '\0') {
769 snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
770 filename = device_name;
771 }
772 }
773 s->type = find_device_type(bs, filename);
774
775 raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
776
777 create_flags = OPEN_EXISTING;
778
779 s->hfile = CreateFile(filename, access_flags,
780 FILE_SHARE_READ, NULL,
781 create_flags, overlapped, NULL);
782 if (s->hfile == INVALID_HANDLE_VALUE) {
783 int err = GetLastError();
784
785 if (err == ERROR_ACCESS_DENIED) {
786 ret = -EACCES;
787 } else {
788 ret = -EINVAL;
789 }
790 error_setg_errno(errp, -ret, "Could not open device");
791 goto done;
792 }
793
794 done:
795 qemu_opts_del(opts);
796 return ret;
797 }
798
799 static BlockDriver bdrv_host_device = {
800 .format_name = "host_device",
801 .protocol_name = "host_device",
802 .instance_size = sizeof(BDRVRawState),
803 .bdrv_needs_filename = true,
804 .bdrv_parse_filename = hdev_parse_filename,
805 .bdrv_probe_device = hdev_probe_device,
806 .bdrv_file_open = hdev_open,
807 .bdrv_close = raw_close,
808 .bdrv_refresh_limits = hdev_refresh_limits,
809
810 .bdrv_aio_preadv = raw_aio_preadv,
811 .bdrv_aio_pwritev = raw_aio_pwritev,
812 .bdrv_aio_flush = raw_aio_flush,
813
814 .bdrv_detach_aio_context = raw_detach_aio_context,
815 .bdrv_attach_aio_context = raw_attach_aio_context,
816
817 .bdrv_getlength = raw_getlength,
818 .has_variable_length = true,
819
820 .bdrv_get_allocated_file_size
821 = raw_get_allocated_file_size,
822 };
823
824 static void bdrv_file_init(void)
825 {
826 bdrv_register(&bdrv_file);
827 bdrv_register(&bdrv_host_device);
828 }
829
830 block_init(bdrv_file_init);