debuggers.hg

view tools/ioemu/block.c @ 10969:3ea0a6847198

[qemu] Make sure disk writes really made it to disk before we report I/O
completion to the guest domain. The DMA_MULTI_THREAD functionality
from the qemu-dm IDE emulation should make the performance overhead
of synchronous writes bearable, or at least comparable to native
hardware.

Signed-off-by: Rik van Riel <riel@redhat.com>
author chris@kneesaa.uk.xensource.com
date Fri Aug 04 10:28:51 2006 +0100 (2006-08-04)
parents 4c2fab8f8c34
children 08a11694b109
line source
1 /*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "vl.h"
25 #include "block_int.h"
27 #ifdef _BSD
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <sys/ioctl.h>
31 #include <sys/queue.h>
32 #include <sys/disk.h>
33 #endif
35 #ifdef CONFIG_COCOA
36 #include <paths.h>
37 #include <sys/param.h>
38 #include <IOKit/IOKitLib.h>
39 #include <IOKit/IOBSD.h>
40 #include <IOKit/storage/IOMediaBSDClient.h>
41 #include <IOKit/storage/IOMedia.h>
42 #include <IOKit/storage/IOCDMedia.h>
43 //#include <IOKit/storage/IOCDTypes.h>
44 #include <CoreFoundation/CoreFoundation.h>
45 #endif
47 #ifdef __sun__
48 #include <sys/dkio.h>
49 #endif
51 static BlockDriverState *bdrv_first;
52 static BlockDriver *first_drv;
54 #ifdef CONFIG_COCOA
55 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
56 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
58 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
59 {
60 kern_return_t kernResult;
61 mach_port_t masterPort;
62 CFMutableDictionaryRef classesToMatch;
64 kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
65 if ( KERN_SUCCESS != kernResult ) {
66 printf( "IOMasterPort returned %d\n", kernResult );
67 }
69 classesToMatch = IOServiceMatching( kIOCDMediaClass );
70 if ( classesToMatch == NULL ) {
71 printf( "IOServiceMatching returned a NULL dictionary.\n" );
72 } else {
73 CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
74 }
75 kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
76 if ( KERN_SUCCESS != kernResult )
77 {
78 printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
79 }
81 return kernResult;
82 }
84 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
85 {
86 io_object_t nextMedia;
87 kern_return_t kernResult = KERN_FAILURE;
88 *bsdPath = '\0';
89 nextMedia = IOIteratorNext( mediaIterator );
90 if ( nextMedia )
91 {
92 CFTypeRef bsdPathAsCFString;
93 bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
94 if ( bsdPathAsCFString ) {
95 size_t devPathLength;
96 strcpy( bsdPath, _PATH_DEV );
97 strcat( bsdPath, "r" );
98 devPathLength = strlen( bsdPath );
99 if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
100 kernResult = KERN_SUCCESS;
101 }
102 CFRelease( bsdPathAsCFString );
103 }
104 IOObjectRelease( nextMedia );
105 }
107 return kernResult;
108 }
110 #endif
112 void bdrv_register(BlockDriver *bdrv)
113 {
114 bdrv->next = first_drv;
115 first_drv = bdrv;
116 }
118 /* create a new block device (by default it is empty) */
119 BlockDriverState *bdrv_new(const char *device_name)
120 {
121 BlockDriverState **pbs, *bs;
123 bs = qemu_mallocz(sizeof(BlockDriverState));
124 if(!bs)
125 return NULL;
126 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
127 if (device_name[0] != '\0') {
128 /* insert at the end */
129 pbs = &bdrv_first;
130 while (*pbs != NULL)
131 pbs = &(*pbs)->next;
132 *pbs = bs;
133 }
134 return bs;
135 }
137 BlockDriver *bdrv_find_format(const char *format_name)
138 {
139 BlockDriver *drv1;
140 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
141 if (!strcmp(drv1->format_name, format_name))
142 return drv1;
143 }
144 return NULL;
145 }
147 int bdrv_create(BlockDriver *drv,
148 const char *filename, int64_t size_in_sectors,
149 const char *backing_file, int flags)
150 {
151 if (!drv->bdrv_create)
152 return -ENOTSUP;
153 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
154 }
156 #ifdef _WIN32
157 void get_tmp_filename(char *filename, int size)
158 {
159 char* p = strrchr(filename, '/');
161 if (p == NULL)
162 return;
164 /* XXX: find a better function */
165 tmpnam(p);
166 *p = '/';
167 }
168 #else
169 void get_tmp_filename(char *filename, int size)
170 {
171 int fd;
172 /* XXX: race condition possible */
173 pstrcpy(filename, size, "/tmp/vl.XXXXXX");
174 fd = mkstemp(filename);
175 close(fd);
176 }
177 #endif
179 /* XXX: force raw format if block or character device ? It would
180 simplify the BSD case */
181 static BlockDriver *find_image_format(const char *filename)
182 {
183 int fd, ret, score, score_max;
184 BlockDriver *drv1, *drv;
185 uint8_t *buf;
186 size_t bufsize = 1024;
188 fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
189 if (fd < 0) {
190 buf = NULL;
191 ret = 0;
192 } else {
193 #ifdef DIOCGSECTORSIZE
194 {
195 unsigned int sectorsize = 512;
196 if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
197 sectorsize > bufsize)
198 bufsize = sectorsize;
199 }
200 #endif
201 #ifdef CONFIG_COCOA
202 u_int32_t blockSize = 512;
203 if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
204 bufsize = blockSize;
205 }
206 #endif
207 buf = qemu_malloc(bufsize);
208 if (!buf)
209 return NULL;
210 ret = read(fd, buf, bufsize);
211 if (ret < 0) {
212 close(fd);
213 qemu_free(buf);
214 return NULL;
215 }
216 close(fd);
217 }
219 drv = NULL;
220 score_max = 0;
221 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
222 score = drv1->bdrv_probe(buf, ret, filename);
223 if (score > score_max) {
224 score_max = score;
225 drv = drv1;
226 }
227 }
228 qemu_free(buf);
229 return drv;
230 }
232 int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)
233 {
234 #ifdef CONFIG_COCOA
235 if ( strncmp( filename, "/dev/cdrom", 10 ) == 0 ) {
236 kern_return_t kernResult;
237 io_iterator_t mediaIterator;
238 char bsdPath[ MAXPATHLEN ];
239 int fd;
241 kernResult = FindEjectableCDMedia( &mediaIterator );
242 kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
244 if ( bsdPath[ 0 ] != '\0' ) {
245 strcat(bsdPath,"s0");
246 /* some CDs don't have a partition 0 */
247 fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
248 if (fd < 0) {
249 bsdPath[strlen(bsdPath)-1] = '1';
250 } else {
251 close(fd);
252 }
253 filename = bsdPath;
254 }
256 if ( mediaIterator )
257 IOObjectRelease( mediaIterator );
258 }
259 #endif
260 return bdrv_open2(bs, filename, snapshot, NULL);
261 }
263 int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
264 BlockDriver *drv)
265 {
266 int ret;
267 char tmp_filename[1024];
269 bs->read_only = 0;
270 bs->is_temporary = 0;
271 bs->encrypted = 0;
273 if (snapshot) {
274 BlockDriverState *bs1;
275 int64_t total_size;
277 /* if snapshot, we create a temporary backing file and open it
278 instead of opening 'filename' directly */
280 /* if there is a backing file, use it */
281 bs1 = bdrv_new("");
282 if (!bs1) {
283 return -1;
284 }
285 if (bdrv_open(bs1, filename, 0) < 0) {
286 bdrv_delete(bs1);
287 return -1;
288 }
289 total_size = bs1->total_sectors;
290 bdrv_delete(bs1);
292 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
293 /* XXX: use cow for linux as it is more efficient ? */
294 if (bdrv_create(&bdrv_qcow, tmp_filename,
295 total_size, filename, 0) < 0) {
296 return -1;
297 }
298 filename = tmp_filename;
299 bs->is_temporary = 1;
300 }
302 pstrcpy(bs->filename, sizeof(bs->filename), filename);
303 if (!drv) {
304 drv = find_image_format(filename);
305 if (!drv)
306 return -1;
307 }
308 bs->drv = drv;
309 bs->opaque = qemu_mallocz(drv->instance_size);
310 if (bs->opaque == NULL && drv->instance_size > 0)
311 return -1;
313 ret = drv->bdrv_open(bs, filename);
314 if (ret < 0) {
315 qemu_free(bs->opaque);
316 return -1;
317 }
318 #ifndef _WIN32
319 if (bs->is_temporary) {
320 unlink(filename);
321 }
322 #endif
323 if (bs->backing_file[0] != '\0' && drv->bdrv_is_allocated) {
324 /* if there is a backing file, use it */
325 bs->backing_hd = bdrv_new("");
326 if (!bs->backing_hd) {
327 fail:
328 bdrv_close(bs);
329 return -1;
330 }
331 if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0)
332 goto fail;
333 }
335 bs->inserted = 1;
337 /* call the change callback */
338 if (bs->change_cb)
339 bs->change_cb(bs->change_opaque);
341 return 0;
342 }
344 void bdrv_close(BlockDriverState *bs)
345 {
346 if (bs->inserted) {
347 if (bs->backing_hd)
348 bdrv_delete(bs->backing_hd);
349 bs->drv->bdrv_close(bs);
350 qemu_free(bs->opaque);
351 #ifdef _WIN32
352 if (bs->is_temporary) {
353 unlink(bs->filename);
354 }
355 #endif
356 bs->opaque = NULL;
357 bs->drv = NULL;
358 bs->inserted = 0;
360 /* call the change callback */
361 if (bs->change_cb)
362 bs->change_cb(bs->change_opaque);
363 }
364 }
366 void bdrv_delete(BlockDriverState *bs)
367 {
368 /* XXX: remove the driver list */
369 bdrv_close(bs);
370 qemu_free(bs);
371 }
373 /* commit COW file into the raw image */
374 int bdrv_commit(BlockDriverState *bs)
375 {
376 int64_t i;
377 int n, j;
378 unsigned char sector[512];
380 if (!bs->inserted)
381 return -ENOENT;
383 if (bs->read_only) {
384 return -EACCES;
385 }
387 if (!bs->backing_hd) {
388 return -ENOTSUP;
389 }
391 for (i = 0; i < bs->total_sectors;) {
392 if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) {
393 for(j = 0; j < n; j++) {
394 if (bdrv_read(bs, i, sector, 1) != 0) {
395 return -EIO;
396 }
398 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
399 return -EIO;
400 }
401 i++;
402 }
403 } else {
404 i += n;
405 }
406 }
408 if (bs->drv->bdrv_make_empty)
409 return bs->drv->bdrv_make_empty(bs);
411 return 0;
412 }
414 /* return -1 if error */
415 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
416 uint8_t *buf, int nb_sectors)
417 {
418 int ret, n;
419 BlockDriver *drv = bs->drv;
421 if (!bs->inserted)
422 return -1;
424 while (nb_sectors > 0) {
425 if (sector_num == 0 && bs->boot_sector_enabled) {
426 memcpy(buf, bs->boot_sector_data, 512);
427 n = 1;
428 } else if (bs->backing_hd) {
429 if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {
430 ret = drv->bdrv_read(bs, sector_num, buf, n);
431 if (ret < 0)
432 return -1;
433 } else {
434 /* read from the base image */
435 ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
436 if (ret < 0)
437 return -1;
438 }
439 } else {
440 ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors);
441 if (ret < 0)
442 return -1;
443 /* no need to loop */
444 break;
445 }
446 nb_sectors -= n;
447 sector_num += n;
448 buf += n * 512;
449 }
450 return 0;
451 }
453 /* return -1 if error */
454 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
455 const uint8_t *buf, int nb_sectors)
456 {
457 if (!bs->inserted)
458 return -1;
459 if (bs->read_only)
460 return -1;
461 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
462 memcpy(bs->boot_sector_data, buf, 512);
463 }
464 return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors);
465 }
467 void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
468 {
469 *nb_sectors_ptr = bs->total_sectors;
470 }
472 /* force a given boot sector. */
473 void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
474 {
475 bs->boot_sector_enabled = 1;
476 if (size > 512)
477 size = 512;
478 memcpy(bs->boot_sector_data, data, size);
479 memset(bs->boot_sector_data + size, 0, 512 - size);
480 }
482 void bdrv_set_geometry_hint(BlockDriverState *bs,
483 int cyls, int heads, int secs)
484 {
485 bs->cyls = cyls;
486 bs->heads = heads;
487 bs->secs = secs;
488 }
490 void bdrv_set_type_hint(BlockDriverState *bs, int type)
491 {
492 bs->type = type;
493 bs->removable = ((type == BDRV_TYPE_CDROM ||
494 type == BDRV_TYPE_FLOPPY));
495 }
497 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
498 {
499 bs->translation = translation;
500 }
502 void bdrv_get_geometry_hint(BlockDriverState *bs,
503 int *pcyls, int *pheads, int *psecs)
504 {
505 *pcyls = bs->cyls;
506 *pheads = bs->heads;
507 *psecs = bs->secs;
508 }
510 int bdrv_get_type_hint(BlockDriverState *bs)
511 {
512 return bs->type;
513 }
515 int bdrv_get_translation_hint(BlockDriverState *bs)
516 {
517 return bs->translation;
518 }
520 int bdrv_is_removable(BlockDriverState *bs)
521 {
522 return bs->removable;
523 }
525 int bdrv_is_read_only(BlockDriverState *bs)
526 {
527 return bs->read_only;
528 }
530 int bdrv_is_inserted(BlockDriverState *bs)
531 {
532 return bs->inserted;
533 }
535 int bdrv_is_locked(BlockDriverState *bs)
536 {
537 return bs->locked;
538 }
540 void bdrv_set_locked(BlockDriverState *bs, int locked)
541 {
542 bs->locked = locked;
543 }
545 void bdrv_set_change_cb(BlockDriverState *bs,
546 void (*change_cb)(void *opaque), void *opaque)
547 {
548 bs->change_cb = change_cb;
549 bs->change_opaque = opaque;
550 }
552 int bdrv_is_encrypted(BlockDriverState *bs)
553 {
554 if (bs->backing_hd && bs->backing_hd->encrypted)
555 return 1;
556 return bs->encrypted;
557 }
559 int bdrv_set_key(BlockDriverState *bs, const char *key)
560 {
561 int ret;
562 if (bs->backing_hd && bs->backing_hd->encrypted) {
563 ret = bdrv_set_key(bs->backing_hd, key);
564 if (ret < 0)
565 return ret;
566 if (!bs->encrypted)
567 return 0;
568 }
569 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
570 return -1;
571 return bs->drv->bdrv_set_key(bs, key);
572 }
574 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
575 {
576 if (!bs->inserted || !bs->drv) {
577 buf[0] = '\0';
578 } else {
579 pstrcpy(buf, buf_size, bs->drv->format_name);
580 }
581 }
583 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
584 void *opaque)
585 {
586 BlockDriver *drv;
588 for (drv = first_drv; drv != NULL; drv = drv->next) {
589 it(opaque, drv->format_name);
590 }
591 }
593 BlockDriverState *bdrv_find(const char *name)
594 {
595 BlockDriverState *bs;
597 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
598 if (!strcmp(name, bs->device_name))
599 return bs;
600 }
601 return NULL;
602 }
604 void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
605 {
606 BlockDriverState *bs;
608 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
609 it(opaque, bs->device_name);
610 }
611 }
613 const char *bdrv_get_device_name(BlockDriverState *bs)
614 {
615 return bs->device_name;
616 }
618 void bdrv_info(void)
619 {
620 BlockDriverState *bs;
622 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
623 term_printf("%s:", bs->device_name);
624 term_printf(" type=");
625 switch(bs->type) {
626 case BDRV_TYPE_HD:
627 term_printf("hd");
628 break;
629 case BDRV_TYPE_CDROM:
630 term_printf("cdrom");
631 break;
632 case BDRV_TYPE_FLOPPY:
633 term_printf("floppy");
634 break;
635 }
636 term_printf(" removable=%d", bs->removable);
637 if (bs->removable) {
638 term_printf(" locked=%d", bs->locked);
639 }
640 if (bs->inserted) {
641 term_printf(" file=%s", bs->filename);
642 if (bs->backing_file[0] != '\0')
643 term_printf(" backing_file=%s", bs->backing_file);
644 term_printf(" ro=%d", bs->read_only);
645 term_printf(" drv=%s", bs->drv->format_name);
646 if (bs->encrypted)
647 term_printf(" encrypted");
648 } else {
649 term_printf(" [not inserted]");
650 }
651 term_printf("\n");
652 }
653 }
655 /**************************************************************/
656 /* RAW block driver */
658 typedef struct BDRVRawState {
659 int fd;
660 } BDRVRawState;
662 static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
663 {
664 return 1; /* maybe */
665 }
667 static int raw_open(BlockDriverState *bs, const char *filename)
668 {
669 BDRVRawState *s = bs->opaque;
670 int fd;
671 int64_t size;
672 #ifdef _BSD
673 struct stat sb;
674 #endif
675 #ifdef __sun__
676 struct dk_minfo minfo;
677 int rv;
678 #endif
680 fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE | O_SYNC);
681 if (fd < 0) {
682 fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
683 if (fd < 0)
684 return -1;
685 bs->read_only = 1;
686 }
687 #ifdef _BSD
688 if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
689 #ifdef DIOCGMEDIASIZE
690 if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
691 #endif
692 #ifdef CONFIG_COCOA
693 size = LONG_LONG_MAX;
694 #else
695 size = lseek(fd, 0LL, SEEK_END);
696 #endif
697 } else
698 #endif
699 #ifdef __sun__
700 /*
701 * use the DKIOCGMEDIAINFO ioctl to read the size.
702 */
703 rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
704 if ( rv != -1 ) {
705 size = minfo.dki_lbsize * minfo.dki_capacity;
706 } else /* there are reports that lseek on some devices
707 fails, but irc discussion said that contingency
708 on contingency was overkill */
709 #endif
710 {
711 size = lseek(fd, 0, SEEK_END);
712 }
713 #ifdef _WIN32
714 /* On Windows hosts it can happen that we're unable to get file size
715 for CD-ROM raw device (it's inherent limitation of the CDFS driver). */
716 if (size == -1)
717 size = LONG_LONG_MAX;
718 #endif
719 bs->total_sectors = size / 512;
720 s->fd = fd;
721 return 0;
722 }
724 static int raw_read(BlockDriverState *bs, int64_t sector_num,
725 uint8_t *buf, int nb_sectors)
726 {
727 BDRVRawState *s = bs->opaque;
728 int ret;
730 lseek(s->fd, sector_num * 512, SEEK_SET);
731 ret = read(s->fd, buf, nb_sectors * 512);
732 if (ret != nb_sectors * 512)
733 return -1;
734 return 0;
735 }
737 static int raw_write(BlockDriverState *bs, int64_t sector_num,
738 const uint8_t *buf, int nb_sectors)
739 {
740 BDRVRawState *s = bs->opaque;
741 int ret;
743 lseek(s->fd, sector_num * 512, SEEK_SET);
744 ret = write(s->fd, buf, nb_sectors * 512);
745 if (ret != nb_sectors * 512)
746 return -1;
747 return 0;
748 }
750 static void raw_close(BlockDriverState *bs)
751 {
752 BDRVRawState *s = bs->opaque;
753 bs->total_sectors = 0;
754 close(s->fd);
755 }
757 static int raw_create(const char *filename, int64_t total_size,
758 const char *backing_file, int flags)
759 {
760 int fd;
762 if (flags || backing_file)
763 return -ENOTSUP;
765 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
766 0644);
767 if (fd < 0)
768 return -EIO;
769 ftruncate(fd, total_size * 512);
770 close(fd);
771 return 0;
772 }
774 BlockDriver bdrv_raw = {
775 "raw",
776 sizeof(BDRVRawState),
777 raw_probe,
778 raw_open,
779 raw_read,
780 raw_write,
781 raw_close,
782 raw_create,
783 };
785 void bdrv_init(void)
786 {
787 bdrv_register(&bdrv_raw);
788 #ifndef _WIN32
789 bdrv_register(&bdrv_cow);
790 #endif
791 bdrv_register(&bdrv_qcow);
792 bdrv_register(&bdrv_vmdk);
793 bdrv_register(&bdrv_cloop);
794 bdrv_register(&bdrv_dmg);
795 bdrv_register(&bdrv_bochs);
796 bdrv_register(&bdrv_vpc);
797 bdrv_register(&bdrv_vvfat);
798 }