2 * QEMU System Emulator block driver
4 * Copyright (c) 2003 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
25 #include "block_int.h"
28 #include <sys/types.h>
30 #include <sys/ioctl.h>
31 #include <sys/queue.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>
47 static BlockDriverState *bdrv_first;
48 static BlockDriver *first_drv;
51 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
52 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
54 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
56 kern_return_t kernResult;
57 mach_port_t masterPort;
58 CFMutableDictionaryRef classesToMatch;
60 kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
61 if ( KERN_SUCCESS != kernResult ) {
62 printf( "IOMasterPort returned %d\n", kernResult );
65 classesToMatch = IOServiceMatching( kIOCDMediaClass );
66 if ( classesToMatch == NULL ) {
67 printf( "IOServiceMatching returned a NULL dictionary.\n" );
69 CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
71 kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
72 if ( KERN_SUCCESS != kernResult )
74 printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
80 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
82 io_object_t nextMedia;
83 kern_return_t kernResult = KERN_FAILURE;
85 nextMedia = IOIteratorNext( mediaIterator );
88 CFTypeRef bsdPathAsCFString;
89 bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
90 if ( bsdPathAsCFString ) {
92 strcpy( bsdPath, _PATH_DEV );
93 strcat( bsdPath, "r" );
94 devPathLength = strlen( bsdPath );
95 if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
96 kernResult = KERN_SUCCESS;
98 CFRelease( bsdPathAsCFString );
100 IOObjectRelease( nextMedia );
108 void bdrv_register(BlockDriver *bdrv)
110 bdrv->next = first_drv;
114 /* create a new block device (by default it is empty) */
115 BlockDriverState *bdrv_new(const char *device_name)
117 BlockDriverState **pbs, *bs;
119 bs = qemu_mallocz(sizeof(BlockDriverState));
122 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
123 if (device_name[0] != '\0') {
124 /* insert at the end */
133 BlockDriver *bdrv_find_format(const char *format_name)
136 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
137 if (!strcmp(drv1->format_name, format_name))
143 int bdrv_create(BlockDriver *drv,
144 const char *filename, int64_t size_in_sectors,
145 const char *backing_file, int flags)
147 if (!drv->bdrv_create)
149 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
153 static void get_tmp_filename(char *filename, int size)
155 /* XXX: find a better function */
159 static void get_tmp_filename(char *filename, int size)
162 /* XXX: race condition possible */
163 pstrcpy(filename, size, "/tmp/vl.XXXXXX");
164 fd = mkstemp(filename);
169 /* XXX: force raw format if block or character device ? It would
170 simplify the BSD case */
171 static BlockDriver *find_image_format(const char *filename)
173 int fd, ret, score, score_max;
174 BlockDriver *drv1, *drv;
176 size_t bufsize = 1024;
178 fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
183 #ifdef DIOCGSECTORSIZE
185 unsigned int sectorsize = 512;
186 if (!ioctl(fd, DIOCGSECTORSIZE, §orsize) &&
187 sectorsize > bufsize)
188 bufsize = sectorsize;
192 u_int32_t blockSize = 512;
193 if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
197 buf = qemu_malloc(bufsize);
200 ret = read(fd, buf, bufsize);
211 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
212 score = drv1->bdrv_probe(buf, ret, filename);
213 if (score > score_max) {
222 int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)
225 if ( strncmp( filename, "/dev/cdrom", 10 ) == 0 ) {
226 kern_return_t kernResult;
227 io_iterator_t mediaIterator;
228 char bsdPath[ MAXPATHLEN ];
231 kernResult = FindEjectableCDMedia( &mediaIterator );
232 kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
234 if ( bsdPath[ 0 ] != '\0' ) {
235 strcat(bsdPath,"s0");
236 /* some CDs don't have a partition 0 */
237 fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
239 bsdPath[strlen(bsdPath)-1] = '1';
247 IOObjectRelease( mediaIterator );
250 return bdrv_open2(bs, filename, snapshot, NULL);
253 int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
257 char tmp_filename[1024];
260 bs->is_temporary = 0;
264 BlockDriverState *bs1;
267 /* if snapshot, we create a temporary backing file and open it
268 instead of opening 'filename' directly */
270 /* if there is a backing file, use it */
275 if (bdrv_open(bs1, filename, 0) < 0) {
279 total_size = bs1->total_sectors;
282 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
283 /* XXX: use cow for linux as it is more efficient ? */
284 if (bdrv_create(&bdrv_qcow, tmp_filename,
285 total_size, filename, 0) < 0) {
288 filename = tmp_filename;
289 bs->is_temporary = 1;
292 pstrcpy(bs->filename, sizeof(bs->filename), filename);
294 drv = find_image_format(filename);
299 bs->opaque = qemu_mallocz(drv->instance_size);
300 if (bs->opaque == NULL && drv->instance_size > 0)
303 ret = drv->bdrv_open(bs, filename);
305 qemu_free(bs->opaque);
309 if (bs->is_temporary) {
313 if (bs->backing_file[0] != '\0' && drv->bdrv_is_allocated) {
314 /* if there is a backing file, use it */
315 bs->backing_hd = bdrv_new("");
316 if (!bs->backing_hd) {
321 if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0)
327 /* call the change callback */
329 bs->change_cb(bs->change_opaque);
334 void bdrv_close(BlockDriverState *bs)
338 bdrv_delete(bs->backing_hd);
339 bs->drv->bdrv_close(bs);
340 qemu_free(bs->opaque);
342 if (bs->is_temporary) {
343 unlink(bs->filename);
350 /* call the change callback */
352 bs->change_cb(bs->change_opaque);
356 void bdrv_delete(BlockDriverState *bs)
358 /* XXX: remove the driver list */
363 /* commit COW file into the raw image */
364 int bdrv_commit(BlockDriverState *bs)
368 unsigned char sector[512];
377 if (!bs->backing_hd) {
381 for (i = 0; i < bs->total_sectors;) {
382 if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) {
383 for(j = 0; j < n; j++) {
384 if (bdrv_read(bs, i, sector, 1) != 0) {
388 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
400 /* return -1 if error */
401 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
402 uint8_t *buf, int nb_sectors)
405 BlockDriver *drv = bs->drv;
410 while (nb_sectors > 0) {
411 if (sector_num == 0 && bs->boot_sector_enabled) {
412 memcpy(buf, bs->boot_sector_data, 512);
414 } else if (bs->backing_hd) {
415 if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {
416 ret = drv->bdrv_read(bs, sector_num, buf, n);
420 /* read from the base image */
421 ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
426 ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors);
429 /* no need to loop */
439 /* return -1 if error */
440 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
441 const uint8_t *buf, int nb_sectors)
447 return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors);
450 void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
452 *nb_sectors_ptr = bs->total_sectors;
455 /* force a given boot sector. */
456 void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
458 bs->boot_sector_enabled = 1;
461 memcpy(bs->boot_sector_data, data, size);
462 memset(bs->boot_sector_data + size, 0, 512 - size);
465 void bdrv_set_geometry_hint(BlockDriverState *bs,
466 int cyls, int heads, int secs)
473 void bdrv_set_type_hint(BlockDriverState *bs, int type)
476 bs->removable = ((type == BDRV_TYPE_CDROM ||
477 type == BDRV_TYPE_FLOPPY));
480 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
482 bs->translation = translation;
485 void bdrv_get_geometry_hint(BlockDriverState *bs,
486 int *pcyls, int *pheads, int *psecs)
493 int bdrv_get_type_hint(BlockDriverState *bs)
498 int bdrv_get_translation_hint(BlockDriverState *bs)
500 return bs->translation;
503 int bdrv_is_removable(BlockDriverState *bs)
505 return bs->removable;
508 int bdrv_is_read_only(BlockDriverState *bs)
510 return bs->read_only;
513 int bdrv_is_inserted(BlockDriverState *bs)
518 int bdrv_is_locked(BlockDriverState *bs)
523 void bdrv_set_locked(BlockDriverState *bs, int locked)
528 void bdrv_set_change_cb(BlockDriverState *bs,
529 void (*change_cb)(void *opaque), void *opaque)
531 bs->change_cb = change_cb;
532 bs->change_opaque = opaque;
535 int bdrv_is_encrypted(BlockDriverState *bs)
537 if (bs->backing_hd && bs->backing_hd->encrypted)
539 return bs->encrypted;
542 int bdrv_set_key(BlockDriverState *bs, const char *key)
545 if (bs->backing_hd && bs->backing_hd->encrypted) {
546 ret = bdrv_set_key(bs->backing_hd, key);
552 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
554 return bs->drv->bdrv_set_key(bs, key);
557 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
559 if (!bs->inserted || !bs->drv) {
562 pstrcpy(buf, buf_size, bs->drv->format_name);
566 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
571 for (drv = first_drv; drv != NULL; drv = drv->next) {
572 it(opaque, drv->format_name);
576 BlockDriverState *bdrv_find(const char *name)
578 BlockDriverState *bs;
580 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
581 if (!strcmp(name, bs->device_name))
587 void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
589 BlockDriverState *bs;
591 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
592 it(opaque, bs->device_name);
596 const char *bdrv_get_device_name(BlockDriverState *bs)
598 return bs->device_name;
603 BlockDriverState *bs;
605 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
606 term_printf("%s:", bs->device_name);
607 term_printf(" type=");
612 case BDRV_TYPE_CDROM:
613 term_printf("cdrom");
615 case BDRV_TYPE_FLOPPY:
616 term_printf("floppy");
619 term_printf(" removable=%d", bs->removable);
621 term_printf(" locked=%d", bs->locked);
624 term_printf(" file=%s", bs->filename);
625 if (bs->backing_file[0] != '\0')
626 term_printf(" backing_file=%s", bs->backing_file);
627 term_printf(" ro=%d", bs->read_only);
628 term_printf(" drv=%s", bs->drv->format_name);
630 term_printf(" encrypted");
632 term_printf(" [not inserted]");
639 /**************************************************************/
640 /* RAW block driver */
642 typedef struct BDRVRawState {
646 static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
648 return 1; /* maybe */
651 static int raw_open(BlockDriverState *bs, const char *filename)
653 BDRVRawState *s = bs->opaque;
660 fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
662 fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
668 if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
669 #ifdef DIOCGMEDIASIZE
670 if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
673 size = LONG_LONG_MAX;
675 size = lseek(fd, 0LL, SEEK_END);
680 size = lseek(fd, 0, SEEK_END);
683 /* On Windows hosts it can happen that we're unable to get file size
684 for CD-ROM raw device (it's inherent limitation of the CDFS driver). */
686 size = LONG_LONG_MAX;
688 bs->total_sectors = size / 512;
693 static int raw_read(BlockDriverState *bs, int64_t sector_num,
694 uint8_t *buf, int nb_sectors)
696 BDRVRawState *s = bs->opaque;
699 lseek(s->fd, sector_num * 512, SEEK_SET);
700 ret = read(s->fd, buf, nb_sectors * 512);
701 if (ret != nb_sectors * 512)
706 static int raw_write(BlockDriverState *bs, int64_t sector_num,
707 const uint8_t *buf, int nb_sectors)
709 BDRVRawState *s = bs->opaque;
712 lseek(s->fd, sector_num * 512, SEEK_SET);
713 ret = write(s->fd, buf, nb_sectors * 512);
714 if (ret != nb_sectors * 512)
719 static void raw_close(BlockDriverState *bs)
721 BDRVRawState *s = bs->opaque;
725 static int raw_create(const char *filename, int64_t total_size,
726 const char *backing_file, int flags)
730 if (flags || backing_file)
733 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
737 ftruncate(fd, total_size * 512);
742 BlockDriver bdrv_raw = {
744 sizeof(BDRVRawState),
755 bdrv_register(&bdrv_raw);
757 bdrv_register(&bdrv_cow);
759 bdrv_register(&bdrv_qcow);
760 bdrv_register(&bdrv_vmdk);
761 bdrv_register(&bdrv_cloop);
762 bdrv_register(&bdrv_dmg);
763 bdrv_register(&bdrv_bochs);
764 bdrv_register(&bdrv_vpc);
765 bdrv_register(&bdrv_vvfat);