2 * Block driver for RAW files (posix)
4 * Copyright (c) 2006 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
24 #include "qemu-common.h"
25 #include "qemu-timer.h"
26 #include "qemu-char.h"
27 #include "block_int.h"
30 #include "posix-aio-compat.h"
35 #include <sys/param.h>
36 #include <IOKit/IOKitLib.h>
37 #include <IOKit/IOBSD.h>
38 #include <IOKit/storage/IOMediaBSDClient.h>
39 #include <IOKit/storage/IOMedia.h>
40 #include <IOKit/storage/IOCDMedia.h>
41 //#include <IOKit/storage/IOCDTypes.h>
42 #include <CoreFoundation/CoreFoundation.h>
46 #define _POSIX_PTHREAD_SEMANTICS 1
51 #include <sys/ioctl.h>
52 #include <linux/cdrom.h>
61 #include <sys/ioctl.h>
62 #include <sys/disklabel.h>
66 //#define DEBUG_FLOPPY
69 #if defined(DEBUG_BLOCK)
70 #define DEBUG_BLOCK_PRINT(formatCstr, args...) do { if (qemu_log_enabled()) \
71 { qemu_log(formatCstr, ##args); qemu_log_flush(); } } while (0)
73 #define DEBUG_BLOCK_PRINT(formatCstr, args...)
76 /* OS X does not have O_DSYNC */
78 #define O_DSYNC O_SYNC
81 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
83 #define O_DIRECT O_DSYNC
90 #define ALIGNED_BUFFER_SIZE (32 * 512)
92 /* if the FD is not accessed during that time (in ms), we try to
93 reopen it to see if the disk has been changed */
94 #define FD_OPEN_TIMEOUT 1000
96 typedef struct BDRVRawState
{
99 unsigned int lseek_err_cnt
;
100 #if defined(__linux__)
101 /* linux floppy specific */
103 int64_t fd_open_time
;
104 int64_t fd_error_time
;
106 int fd_media_changed
;
108 uint8_t* aligned_buf
;
111 static int posix_aio_init(void);
113 static int fd_open(BlockDriverState
*bs
);
115 static int raw_open(BlockDriverState
*bs
, const char *filename
, int flags
)
117 BDRVRawState
*s
= bs
->opaque
;
118 int fd
, open_flags
, ret
;
122 s
->lseek_err_cnt
= 0;
124 open_flags
= O_BINARY
;
125 if ((flags
& BDRV_O_ACCESS
) == O_RDWR
) {
126 open_flags
|= O_RDWR
;
128 open_flags
|= O_RDONLY
;
131 if (flags
& BDRV_O_CREAT
)
132 open_flags
|= O_CREAT
| O_TRUNC
;
134 /* Use O_DSYNC for write-through caching, no flags for write-back caching,
135 * and O_DIRECT for no caching. */
136 if ((flags
& BDRV_O_NOCACHE
))
137 open_flags
|= O_DIRECT
;
138 else if (!(flags
& BDRV_O_CACHE_WB
))
139 open_flags
|= O_DSYNC
;
141 s
->type
= FTYPE_FILE
;
143 fd
= open(filename
, open_flags
, 0644);
151 s
->aligned_buf
= NULL
;
152 if ((flags
& BDRV_O_NOCACHE
)) {
153 s
->aligned_buf
= qemu_memalign(512, ALIGNED_BUFFER_SIZE
);
154 if (s
->aligned_buf
== NULL
) {
163 /* XXX: use host sector size if necessary with:
164 #ifdef DIOCGSECTORSIZE
166 unsigned int sectorsize = 512;
167 if (!ioctl(fd, DIOCGSECTORSIZE, §orsize) &&
168 sectorsize > bufsize)
169 bufsize = sectorsize;
173 u_int32_t blockSize = 512;
174 if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
181 * offset and count are in bytes, but must be multiples of 512 for files
182 * opened with O_DIRECT. buf must be aligned to 512 bytes then.
184 * This function may be called without alignment if the caller ensures
185 * that O_DIRECT is not in effect.
187 static int raw_pread_aligned(BlockDriverState
*bs
, int64_t offset
,
188 uint8_t *buf
, int count
)
190 BDRVRawState
*s
= bs
->opaque
;
197 if (offset
>= 0 && lseek(s
->fd
, offset
, SEEK_SET
) == (off_t
)-1) {
198 ++(s
->lseek_err_cnt
);
199 if(s
->lseek_err_cnt
<= 10) {
200 DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64
", %p, %d) [%" PRId64
201 "] lseek failed : %d = %s\n",
202 s
->fd
, bs
->filename
, offset
, buf
, count
,
203 bs
->total_sectors
, errno
, strerror(errno
));
209 ret
= read(s
->fd
, buf
, count
);
211 goto label__raw_read__success
;
213 DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64
", %p, %d) [%" PRId64
214 "] read failed %d : %d = %s\n",
215 s
->fd
, bs
->filename
, offset
, buf
, count
,
216 bs
->total_sectors
, ret
, errno
, strerror(errno
));
218 /* Try harder for CDrom. */
219 if (bs
->type
== BDRV_TYPE_CDROM
) {
220 lseek(s
->fd
, offset
, SEEK_SET
);
221 ret
= read(s
->fd
, buf
, count
);
223 goto label__raw_read__success
;
224 lseek(s
->fd
, offset
, SEEK_SET
);
225 ret
= read(s
->fd
, buf
, count
);
227 goto label__raw_read__success
;
229 DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64
", %p, %d) [%" PRId64
230 "] retry read failed %d : %d = %s\n",
231 s
->fd
, bs
->filename
, offset
, buf
, count
,
232 bs
->total_sectors
, ret
, errno
, strerror(errno
));
235 label__raw_read__success
:
241 * offset and count are in bytes, but must be multiples of 512 for files
242 * opened with O_DIRECT. buf must be aligned to 512 bytes then.
244 * This function may be called without alignment if the caller ensures
245 * that O_DIRECT is not in effect.
247 static int raw_pwrite_aligned(BlockDriverState
*bs
, int64_t offset
,
248 const uint8_t *buf
, int count
)
250 BDRVRawState
*s
= bs
->opaque
;
257 if (offset
>= 0 && lseek(s
->fd
, offset
, SEEK_SET
) == (off_t
)-1) {
258 ++(s
->lseek_err_cnt
);
259 if(s
->lseek_err_cnt
) {
260 DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64
", %p, %d) [%"
261 PRId64
"] lseek failed : %d = %s\n",
262 s
->fd
, bs
->filename
, offset
, buf
, count
,
263 bs
->total_sectors
, errno
, strerror(errno
));
267 s
->lseek_err_cnt
= 0;
269 ret
= write(s
->fd
, buf
, count
);
271 goto label__raw_write__success
;
273 DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64
", %p, %d) [%" PRId64
274 "] write failed %d : %d = %s\n",
275 s
->fd
, bs
->filename
, offset
, buf
, count
,
276 bs
->total_sectors
, ret
, errno
, strerror(errno
));
278 label__raw_write__success
:
280 return (ret
< 0) ? -errno
: ret
;
285 * offset and count are in bytes and possibly not aligned. For files opened
286 * with O_DIRECT, necessary alignments are ensured before calling
287 * raw_pread_aligned to do the actual read.
289 static int raw_pread(BlockDriverState
*bs
, int64_t offset
,
290 uint8_t *buf
, int count
)
292 BDRVRawState
*s
= bs
->opaque
;
293 int size
, ret
, shift
, sum
;
297 if (s
->aligned_buf
!= NULL
) {
299 if (offset
& 0x1ff) {
300 /* align offset on a 512 bytes boundary */
302 shift
= offset
& 0x1ff;
303 size
= (shift
+ count
+ 0x1ff) & ~0x1ff;
304 if (size
> ALIGNED_BUFFER_SIZE
)
305 size
= ALIGNED_BUFFER_SIZE
;
306 ret
= raw_pread_aligned(bs
, offset
- shift
, s
->aligned_buf
, size
);
313 memcpy(buf
, s
->aligned_buf
+ shift
, size
);
323 if (count
& 0x1ff || (uintptr_t) buf
& 0x1ff) {
325 /* read on aligned buffer */
329 size
= (count
+ 0x1ff) & ~0x1ff;
330 if (size
> ALIGNED_BUFFER_SIZE
)
331 size
= ALIGNED_BUFFER_SIZE
;
333 ret
= raw_pread_aligned(bs
, offset
, s
->aligned_buf
, size
);
341 memcpy(buf
, s
->aligned_buf
, size
);
353 return raw_pread_aligned(bs
, offset
, buf
, count
) + sum
;
357 * offset and count are in bytes and possibly not aligned. For files opened
358 * with O_DIRECT, necessary alignments are ensured before calling
359 * raw_pwrite_aligned to do the actual write.
361 static int raw_pwrite(BlockDriverState
*bs
, int64_t offset
,
362 const uint8_t *buf
, int count
)
364 BDRVRawState
*s
= bs
->opaque
;
365 int size
, ret
, shift
, sum
;
369 if (s
->aligned_buf
!= NULL
) {
371 if (offset
& 0x1ff) {
372 /* align offset on a 512 bytes boundary */
373 shift
= offset
& 0x1ff;
374 ret
= raw_pread_aligned(bs
, offset
- shift
, s
->aligned_buf
, 512);
381 memcpy(s
->aligned_buf
+ shift
, buf
, size
);
383 ret
= raw_pwrite_aligned(bs
, offset
- shift
, s
->aligned_buf
, 512);
395 if (count
& 0x1ff || (uintptr_t) buf
& 0x1ff) {
397 while ((size
= (count
& ~0x1ff)) != 0) {
399 if (size
> ALIGNED_BUFFER_SIZE
)
400 size
= ALIGNED_BUFFER_SIZE
;
402 memcpy(s
->aligned_buf
, buf
, size
);
404 ret
= raw_pwrite_aligned(bs
, offset
, s
->aligned_buf
, size
);
413 /* here, count < 512 because (count & ~0x1ff) == 0 */
415 ret
= raw_pread_aligned(bs
, offset
, s
->aligned_buf
, 512);
418 memcpy(s
->aligned_buf
, buf
, count
);
420 ret
= raw_pwrite_aligned(bs
, offset
, s
->aligned_buf
, 512);
431 return raw_pwrite_aligned(bs
, offset
, buf
, count
) + sum
;
435 /***********************************************************/
436 /* Unix AIO using POSIX AIO */
438 typedef struct RawAIOCB
{
439 BlockDriverAIOCB common
;
440 struct qemu_paiocb aiocb
;
441 struct RawAIOCB
*next
;
445 typedef struct PosixAioState
451 static void posix_aio_read(void *opaque
)
453 PosixAioState
*s
= opaque
;
454 RawAIOCB
*acb
, **pacb
;
458 /* read all bytes from signal pipe */
462 len
= read(s
->rfd
, bytes
, sizeof(bytes
));
463 if (len
== -1 && errno
== EINTR
)
464 continue; /* try again */
465 if (len
== sizeof(bytes
))
466 continue; /* more to read */
471 pacb
= &s
->first_aio
;
476 ret
= qemu_paio_error(&acb
->aiocb
);
477 if (ret
== ECANCELED
) {
478 /* remove the request */
480 qemu_aio_release(acb
);
481 } else if (ret
!= EINPROGRESS
) {
484 ret
= qemu_paio_return(&acb
->aiocb
);
485 if (ret
== acb
->aiocb
.aio_nbytes
)
492 /* remove the request */
494 /* call the callback */
495 acb
->common
.cb(acb
->common
.opaque
, ret
);
496 qemu_aio_release(acb
);
506 static int posix_aio_flush(void *opaque
)
508 PosixAioState
*s
= opaque
;
509 return !!s
->first_aio
;
512 static PosixAioState
*posix_aio_state
;
514 static void aio_signal_handler(int signum
)
516 if (posix_aio_state
) {
519 write(posix_aio_state
->wfd
, &byte
, sizeof(byte
));
525 static int posix_aio_init(void)
527 struct sigaction act
;
530 struct qemu_paioinit ai
;
535 s
= qemu_malloc(sizeof(PosixAioState
));
539 sigfillset(&act
.sa_mask
);
540 act
.sa_flags
= 0; /* do not restart syscalls to interrupt select() */
541 act
.sa_handler
= aio_signal_handler
;
542 sigaction(SIGUSR2
, &act
, NULL
);
545 if (pipe(fds
) == -1) {
546 fprintf(stderr
, "failed to create pipe\n");
553 fcntl(s
->rfd
, F_SETFL
, O_NONBLOCK
);
554 fcntl(s
->wfd
, F_SETFL
, O_NONBLOCK
);
556 qemu_aio_set_fd_handler(s
->rfd
, posix_aio_read
, NULL
, posix_aio_flush
, s
);
558 memset(&ai
, 0, sizeof(ai
));
568 static RawAIOCB
*raw_aio_setup(BlockDriverState
*bs
,
569 int64_t sector_num
, uint8_t *buf
, int nb_sectors
,
570 BlockDriverCompletionFunc
*cb
, void *opaque
)
572 BDRVRawState
*s
= bs
->opaque
;
578 acb
= qemu_aio_get(bs
, cb
, opaque
);
581 acb
->aiocb
.aio_fildes
= s
->fd
;
582 acb
->aiocb
.ev_signo
= SIGUSR2
;
583 acb
->aiocb
.aio_buf
= buf
;
585 acb
->aiocb
.aio_nbytes
= -nb_sectors
;
587 acb
->aiocb
.aio_nbytes
= nb_sectors
* 512;
588 acb
->aiocb
.aio_offset
= sector_num
* 512;
589 acb
->next
= posix_aio_state
->first_aio
;
590 posix_aio_state
->first_aio
= acb
;
594 static void raw_aio_em_cb(void* opaque
)
596 RawAIOCB
*acb
= opaque
;
597 acb
->common
.cb(acb
->common
.opaque
, acb
->ret
);
598 qemu_aio_release(acb
);
601 static void raw_aio_remove(RawAIOCB
*acb
)
605 /* remove the callback from the queue */
606 pacb
= &posix_aio_state
->first_aio
;
610 } else if (*pacb
== acb
) {
612 qemu_aio_release(acb
);
619 static BlockDriverAIOCB
*raw_aio_read(BlockDriverState
*bs
,
620 int64_t sector_num
, uint8_t *buf
, int nb_sectors
,
621 BlockDriverCompletionFunc
*cb
, void *opaque
)
626 * If O_DIRECT is used and the buffer is not aligned fall back
629 BDRVRawState
*s
= bs
->opaque
;
631 if (unlikely(s
->aligned_buf
!= NULL
&& ((uintptr_t) buf
% 512))) {
633 acb
= qemu_aio_get(bs
, cb
, opaque
);
634 acb
->ret
= raw_pread(bs
, 512 * sector_num
, buf
, 512 * nb_sectors
);
635 bh
= qemu_bh_new(raw_aio_em_cb
, acb
);
636 qemu_bh_schedule(bh
);
640 acb
= raw_aio_setup(bs
, sector_num
, buf
, nb_sectors
, cb
, opaque
);
643 if (qemu_paio_read(&acb
->aiocb
) < 0) {
650 static BlockDriverAIOCB
*raw_aio_write(BlockDriverState
*bs
,
651 int64_t sector_num
, const uint8_t *buf
, int nb_sectors
,
652 BlockDriverCompletionFunc
*cb
, void *opaque
)
657 * If O_DIRECT is used and the buffer is not aligned fall back
660 BDRVRawState
*s
= bs
->opaque
;
662 if (unlikely(s
->aligned_buf
!= NULL
&& ((uintptr_t) buf
% 512))) {
664 acb
= qemu_aio_get(bs
, cb
, opaque
);
665 acb
->ret
= raw_pwrite(bs
, 512 * sector_num
, buf
, 512 * nb_sectors
);
666 bh
= qemu_bh_new(raw_aio_em_cb
, acb
);
667 qemu_bh_schedule(bh
);
671 acb
= raw_aio_setup(bs
, sector_num
, (uint8_t*)buf
, nb_sectors
, cb
, opaque
);
674 if (qemu_paio_write(&acb
->aiocb
) < 0) {
681 static void raw_aio_cancel(BlockDriverAIOCB
*blockacb
)
684 RawAIOCB
*acb
= (RawAIOCB
*)blockacb
;
686 ret
= qemu_paio_cancel(acb
->aiocb
.aio_fildes
, &acb
->aiocb
);
687 if (ret
== QEMU_PAIO_NOTCANCELED
) {
688 /* fail safe: if the aio could not be canceled, we wait for
690 while (qemu_paio_error(&acb
->aiocb
) == EINPROGRESS
);
695 #else /* CONFIG_AIO */
696 static int posix_aio_init(void)
700 #endif /* CONFIG_AIO */
703 static void raw_close(BlockDriverState
*bs
)
705 BDRVRawState
*s
= bs
->opaque
;
709 if (s
->aligned_buf
!= NULL
)
710 qemu_free(s
->aligned_buf
);
714 static int raw_truncate(BlockDriverState
*bs
, int64_t offset
)
716 BDRVRawState
*s
= bs
->opaque
;
717 if (s
->type
!= FTYPE_FILE
)
719 if (ftruncate(s
->fd
, offset
) < 0)
725 static int64_t raw_getlength(BlockDriverState
*bs
)
727 BDRVRawState
*s
= bs
->opaque
;
733 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
736 if (ioctl(fd
, DIOCGDINFO
, &dl
))
738 return (uint64_t)dl
.d_secsize
*
739 dl
.d_partitions
[DISKPART(st
.st_rdev
)].p_size
;
743 #else /* !__OpenBSD__ */
744 static int64_t raw_getlength(BlockDriverState
*bs
)
746 BDRVRawState
*s
= bs
->opaque
;
753 struct dk_minfo minfo
;
763 if (!fstat(fd
, &sb
) && (S_IFCHR
& sb
.st_mode
)) {
764 #ifdef DIOCGMEDIASIZE
765 if (ioctl(fd
, DIOCGMEDIASIZE
, (off_t
*)&size
))
768 size
= LONG_LONG_MAX
;
770 size
= lseek(fd
, 0LL, SEEK_END
);
776 * use the DKIOCGMEDIAINFO ioctl to read the size.
778 rv
= ioctl ( fd
, DKIOCGMEDIAINFO
, &minfo
);
780 size
= minfo
.dki_lbsize
* minfo
.dki_capacity
;
781 } else /* there are reports that lseek on some devices
782 fails, but irc discussion said that contingency
783 on contingency was overkill */
786 size
= lseek(fd
, 0, SEEK_END
);
792 static int raw_create(const char *filename
, int64_t total_size
,
793 const char *backing_file
, int flags
)
797 if (flags
|| backing_file
)
800 fd
= open(filename
, O_WRONLY
| O_CREAT
| O_TRUNC
| O_BINARY
,
804 ftruncate(fd
, total_size
* 512);
809 static void raw_flush(BlockDriverState
*bs
)
811 BDRVRawState
*s
= bs
->opaque
;
815 BlockDriver bdrv_raw
= {
817 sizeof(BDRVRawState
),
818 NULL
, /* no probe for protocols */
827 .bdrv_aio_read
= raw_aio_read
,
828 .bdrv_aio_write
= raw_aio_write
,
829 .bdrv_aio_cancel
= raw_aio_cancel
,
830 .aiocb_size
= sizeof(RawAIOCB
),
833 .bdrv_pread
= raw_pread
,
834 .bdrv_pwrite
= raw_pwrite
,
835 .bdrv_truncate
= raw_truncate
,
836 .bdrv_getlength
= raw_getlength
,
839 /***********************************************/
843 static kern_return_t
FindEjectableCDMedia( io_iterator_t
*mediaIterator
);
844 static kern_return_t
GetBSDPath( io_iterator_t mediaIterator
, char *bsdPath
, CFIndex maxPathSize
);
846 kern_return_t
FindEjectableCDMedia( io_iterator_t
*mediaIterator
)
848 kern_return_t kernResult
;
849 mach_port_t masterPort
;
850 CFMutableDictionaryRef classesToMatch
;
852 kernResult
= IOMasterPort( MACH_PORT_NULL
, &masterPort
);
853 if ( KERN_SUCCESS
!= kernResult
) {
854 printf( "IOMasterPort returned %d\n", kernResult
);
857 classesToMatch
= IOServiceMatching( kIOCDMediaClass
);
858 if ( classesToMatch
== NULL
) {
859 printf( "IOServiceMatching returned a NULL dictionary.\n" );
861 CFDictionarySetValue( classesToMatch
, CFSTR( kIOMediaEjectableKey
), kCFBooleanTrue
);
863 kernResult
= IOServiceGetMatchingServices( masterPort
, classesToMatch
, mediaIterator
);
864 if ( KERN_SUCCESS
!= kernResult
)
866 printf( "IOServiceGetMatchingServices returned %d\n", kernResult
);
872 kern_return_t
GetBSDPath( io_iterator_t mediaIterator
, char *bsdPath
, CFIndex maxPathSize
)
874 io_object_t nextMedia
;
875 kern_return_t kernResult
= KERN_FAILURE
;
877 nextMedia
= IOIteratorNext( mediaIterator
);
880 CFTypeRef bsdPathAsCFString
;
881 bsdPathAsCFString
= IORegistryEntryCreateCFProperty( nextMedia
, CFSTR( kIOBSDNameKey
), kCFAllocatorDefault
, 0 );
882 if ( bsdPathAsCFString
) {
883 size_t devPathLength
;
884 strcpy( bsdPath
, _PATH_DEV
);
885 strcat( bsdPath
, "r" );
886 devPathLength
= strlen( bsdPath
);
887 if ( CFStringGetCString( bsdPathAsCFString
, bsdPath
+ devPathLength
, maxPathSize
- devPathLength
, kCFStringEncodingASCII
) ) {
888 kernResult
= KERN_SUCCESS
;
890 CFRelease( bsdPathAsCFString
);
892 IOObjectRelease( nextMedia
);
900 static int hdev_open(BlockDriverState
*bs
, const char *filename
, int flags
)
902 BDRVRawState
*s
= bs
->opaque
;
903 int fd
, open_flags
, ret
;
908 if (strstart(filename
, "/dev/cdrom", NULL
)) {
909 kern_return_t kernResult
;
910 io_iterator_t mediaIterator
;
911 char bsdPath
[ MAXPATHLEN
];
914 kernResult
= FindEjectableCDMedia( &mediaIterator
);
915 kernResult
= GetBSDPath( mediaIterator
, bsdPath
, sizeof( bsdPath
) );
917 if ( bsdPath
[ 0 ] != '\0' ) {
918 strcat(bsdPath
,"s0");
919 /* some CDs don't have a partition 0 */
920 fd
= open(bsdPath
, O_RDONLY
| O_BINARY
| O_LARGEFILE
);
922 bsdPath
[strlen(bsdPath
)-1] = '1';
930 IOObjectRelease( mediaIterator
);
933 open_flags
= O_BINARY
;
934 if ((flags
& BDRV_O_ACCESS
) == O_RDWR
) {
935 open_flags
|= O_RDWR
;
937 open_flags
|= O_RDONLY
;
940 /* Use O_DSYNC for write-through caching, no flags for write-back caching,
941 * and O_DIRECT for no caching. */
942 if ((flags
& BDRV_O_NOCACHE
))
943 open_flags
|= O_DIRECT
;
944 else if (!(flags
& BDRV_O_CACHE_WB
))
945 open_flags
|= O_DSYNC
;
947 s
->type
= FTYPE_FILE
;
948 #if defined(__linux__)
949 if (strstart(filename
, "/dev/cd", NULL
)) {
950 /* open will not fail even if no CD is inserted */
951 open_flags
|= O_NONBLOCK
;
953 } else if (strstart(filename
, "/dev/fd", NULL
)) {
955 s
->fd_open_flags
= open_flags
;
956 /* open will not fail even if no floppy is inserted */
957 open_flags
|= O_NONBLOCK
;
958 } else if (strstart(filename
, "/dev/sg", NULL
)) {
962 fd
= open(filename
, open_flags
, 0644);
970 #if defined(__linux__)
971 /* close fd so that we can reopen it as needed */
972 if (s
->type
== FTYPE_FD
) {
975 s
->fd_media_changed
= 1;
981 #if defined(__linux__)
982 /* Note: we do not have a reliable method to detect if the floppy is
983 present. The current method is to try to open the floppy at every
984 I/O and to keep it opened during a few hundreds of ms. */
985 static int fd_open(BlockDriverState
*bs
)
987 BDRVRawState
*s
= bs
->opaque
;
988 int last_media_present
;
990 if (s
->type
!= FTYPE_FD
)
992 last_media_present
= (s
->fd
>= 0);
994 (qemu_get_clock(rt_clock
) - s
->fd_open_time
) >= FD_OPEN_TIMEOUT
) {
998 printf("Floppy closed\n");
1002 if (s
->fd_got_error
&&
1003 (qemu_get_clock(rt_clock
) - s
->fd_error_time
) < FD_OPEN_TIMEOUT
) {
1005 printf("No floppy (open delayed)\n");
1009 s
->fd
= open(bs
->filename
, s
->fd_open_flags
);
1011 s
->fd_error_time
= qemu_get_clock(rt_clock
);
1012 s
->fd_got_error
= 1;
1013 if (last_media_present
)
1014 s
->fd_media_changed
= 1;
1016 printf("No floppy\n");
1021 printf("Floppy opened\n");
1024 if (!last_media_present
)
1025 s
->fd_media_changed
= 1;
1026 s
->fd_open_time
= qemu_get_clock(rt_clock
);
1027 s
->fd_got_error
= 0;
1031 static int raw_is_inserted(BlockDriverState
*bs
)
1033 BDRVRawState
*s
= bs
->opaque
;
1038 ret
= ioctl(s
->fd
, CDROM_DRIVE_STATUS
, CDSL_CURRENT
);
1039 if (ret
== CDS_DISC_OK
)
1052 /* currently only used by fdc.c, but a CD version would be good too */
1053 static int raw_media_changed(BlockDriverState
*bs
)
1055 BDRVRawState
*s
= bs
->opaque
;
1061 /* XXX: we do not have a true media changed indication. It
1062 does not work if the floppy is changed without trying
1065 ret
= s
->fd_media_changed
;
1066 s
->fd_media_changed
= 0;
1068 printf("Floppy changed=%d\n", ret
);
1077 static int raw_eject(BlockDriverState
*bs
, int eject_flag
)
1079 BDRVRawState
*s
= bs
->opaque
;
1084 if (ioctl (s
->fd
, CDROMEJECT
, NULL
) < 0)
1085 perror("CDROMEJECT");
1087 if (ioctl (s
->fd
, CDROMCLOSETRAY
, NULL
) < 0)
1088 perror("CDROMEJECT");
1098 fd
= open(bs
->filename
, s
->fd_open_flags
| O_NONBLOCK
);
1100 if (ioctl(fd
, FDEJECT
, 0) < 0)
1112 static int raw_set_locked(BlockDriverState
*bs
, int locked
)
1114 BDRVRawState
*s
= bs
->opaque
;
1118 if (ioctl (s
->fd
, CDROM_LOCKDOOR
, locked
) < 0) {
1119 /* Note: an error can happen if the distribution automatically
1120 mounts the CD-ROM */
1121 // perror("CDROM_LOCKDOOR");
1130 static int raw_ioctl(BlockDriverState
*bs
, unsigned long int req
, void *buf
)
1132 BDRVRawState
*s
= bs
->opaque
;
1134 return ioctl(s
->fd
, req
, buf
);
1138 static int fd_open(BlockDriverState
*bs
)
1143 static int raw_is_inserted(BlockDriverState
*bs
)
1148 static int raw_media_changed(BlockDriverState
*bs
)
1153 static int raw_eject(BlockDriverState
*bs
, int eject_flag
)
1158 static int raw_set_locked(BlockDriverState
*bs
, int locked
)
1163 static int raw_ioctl(BlockDriverState
*bs
, unsigned long int req
, void *buf
)
1169 BlockDriver bdrv_host_device
= {
1171 sizeof(BDRVRawState
),
1172 NULL
, /* no probe for protocols */
1181 .bdrv_aio_read
= raw_aio_read
,
1182 .bdrv_aio_write
= raw_aio_write
,
1183 .bdrv_aio_cancel
= raw_aio_cancel
,
1184 .aiocb_size
= sizeof(RawAIOCB
),
1187 .bdrv_pread
= raw_pread
,
1188 .bdrv_pwrite
= raw_pwrite
,
1189 .bdrv_getlength
= raw_getlength
,
1191 /* removable device support */
1192 .bdrv_is_inserted
= raw_is_inserted
,
1193 .bdrv_media_changed
= raw_media_changed
,
1194 .bdrv_eject
= raw_eject
,
1195 .bdrv_set_locked
= raw_set_locked
,
1196 /* generic scsi device */
1197 .bdrv_ioctl
= raw_ioctl
,