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/*
* QEMU System Emulator block driver
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*
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* Copyright ( c ) 2003 Fabrice Bellard
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*
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* Permission is hereby granted , free of charge , to any person obtaining a copy
* of this software and associated documentation files ( the "Software" ), to deal
* in the Software without restriction , including without limitation the rights
* to use , copy , modify , merge , publish , distribute , sublicense , and / or sell
* copies of the Software , and to permit persons to whom the Software is
* furnished to do so , subject to the following conditions :
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software .
*
* THE SOFTWARE IS PROVIDED "AS IS" , WITHOUT WARRANTY OF ANY KIND , EXPRESS OR
* IMPLIED , INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY ,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT . IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM , DAMAGES OR OTHER
* LIABILITY , WHETHER IN AN ACTION OF CONTRACT , TORT OR OTHERWISE , ARISING FROM ,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE .
*/
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# include "config-host.h"
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# ifdef HOST_BSD
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/* include native header before sys-queue.h */
# include < sys / queue . h >
# endif
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# include "qemu-common.h"
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# include "monitor.h"
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# include "block_int.h"
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# ifdef HOST_BSD
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# include < sys / types . h >
# include < sys / stat . h >
# include < sys / ioctl . h >
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# ifndef __DragonFly__
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# include < sys / disk . h >
# endif
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# endif
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# ifdef _WIN32
# include < windows . h >
# endif
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# define SECTOR_BITS 9
# define SECTOR_SIZE ( 1 << SECTOR_BITS )
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typedef struct BlockDriverAIOCBSync {
BlockDriverAIOCB common ;
QEMUBH * bh ;
int ret ;
} BlockDriverAIOCBSync ;
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static BlockDriverAIOCB * bdrv_aio_read_em ( BlockDriverState * bs ,
int64_t sector_num , uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque );
static BlockDriverAIOCB * bdrv_aio_write_em ( BlockDriverState * bs ,
int64_t sector_num , const uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque );
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static void bdrv_aio_cancel_em ( BlockDriverAIOCB * acb );
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static int bdrv_read_em ( BlockDriverState * bs , int64_t sector_num ,
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uint8_t * buf , int nb_sectors );
static int bdrv_write_em ( BlockDriverState * bs , int64_t sector_num ,
const uint8_t * buf , int nb_sectors );
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BlockDriverState * bdrv_first ;
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static BlockDriver * first_drv ;
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int path_is_absolute ( const char * path )
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{
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const char * p ;
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# ifdef _WIN32
/* specific case for names like: "\\.\d:" */
if ( * path == '/' || * path == '\\' )
return 1 ;
# endif
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p = strchr ( path , ':' );
if ( p )
p ++ ;
else
p = path ;
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# ifdef _WIN32
return ( * p == '/' || * p == '\\' );
# else
return ( * p == '/' );
# endif
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}
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/* if filename is absolute , just copy it to dest . Otherwise , build a
path to it by considering it is relative to base_path . URL are
supported . */
void path_combine ( char * dest , int dest_size ,
const char * base_path ,
const char * filename )
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{
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const char * p , * p1 ;
int len ;
if ( dest_size <= 0 )
return ;
if ( path_is_absolute ( filename )) {
pstrcpy ( dest , dest_size , filename );
} else {
p = strchr ( base_path , ':' );
if ( p )
p ++ ;
else
p = base_path ;
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p1 = strrchr ( base_path , '/' );
# ifdef _WIN32
{
const char * p2 ;
p2 = strrchr ( base_path , '\\' );
if ( ! p1 || p2 > p1 )
p1 = p2 ;
}
# endif
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if ( p1 )
p1 ++ ;
else
p1 = base_path ;
if ( p1 > p )
p = p1 ;
len = p - base_path ;
if ( len > dest_size - 1 )
len = dest_size - 1 ;
memcpy ( dest , base_path , len );
dest [ len ] = '\0' ;
pstrcat ( dest , dest_size , filename );
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}
}
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static void bdrv_register ( BlockDriver * bdrv )
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{
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if ( ! bdrv -> bdrv_aio_read ) {
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/* add AIO emulation layer */
bdrv -> bdrv_aio_read = bdrv_aio_read_em ;
bdrv -> bdrv_aio_write = bdrv_aio_write_em ;
bdrv -> bdrv_aio_cancel = bdrv_aio_cancel_em ;
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bdrv -> aiocb_size = sizeof ( BlockDriverAIOCBSync );
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} else if ( ! bdrv -> bdrv_read && ! bdrv -> bdrv_pread ) {
/* add synchronous IO emulation layer */
bdrv -> bdrv_read = bdrv_read_em ;
bdrv -> bdrv_write = bdrv_write_em ;
}
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bdrv -> next = first_drv ;
first_drv = bdrv ;
}
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/* create a new block device (by default it is empty) */
BlockDriverState * bdrv_new ( const char * device_name )
{
BlockDriverState ** pbs , * bs ;
bs = qemu_mallocz ( sizeof ( BlockDriverState ));
pstrcpy ( bs -> device_name , sizeof ( bs -> device_name ), device_name );
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if ( device_name [ 0 ] != '\0' ) {
/* insert at the end */
pbs = & bdrv_first ;
while ( * pbs != NULL )
pbs = & ( * pbs ) -> next ;
* pbs = bs ;
}
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return bs ;
}
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BlockDriver * bdrv_find_format ( const char * format_name )
{
BlockDriver * drv1 ;
for ( drv1 = first_drv ; drv1 != NULL ; drv1 = drv1 -> next ) {
if ( ! strcmp ( drv1 -> format_name , format_name ))
return drv1 ;
}
return NULL ;
}
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int bdrv_create ( BlockDriver * drv ,
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const char * filename , int64_t size_in_sectors ,
const char * backing_file , int flags )
{
if ( ! drv -> bdrv_create )
return - ENOTSUP ;
return drv -> bdrv_create ( filename , size_in_sectors , backing_file , flags );
}
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# ifdef _WIN32
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void get_tmp_filename ( char * filename , int size )
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{
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char temp_dir [ MAX_PATH ];
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GetTempPath ( MAX_PATH , temp_dir );
GetTempFileName ( temp_dir , "qem" , 0 , filename );
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}
# else
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void get_tmp_filename ( char * filename , int size )
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{
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int fd ;
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const char * tmpdir ;
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/* XXX: race condition possible */
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tmpdir = getenv ( "TMPDIR" );
if ( ! tmpdir )
tmpdir = "/tmp" ;
snprintf ( filename , size , "%s/vl.XXXXXX" , tmpdir );
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fd = mkstemp ( filename );
close ( fd );
}
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# endif
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# ifdef _WIN32
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static int is_windows_drive_prefix ( const char * filename )
{
return ((( filename [ 0 ] >= 'a' && filename [ 0 ] <= 'z' ) ||
( filename [ 0 ] >= 'A' && filename [ 0 ] <= 'Z' )) &&
filename [ 1 ] == ':' );
}
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static int is_windows_drive ( const char * filename )
{
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if ( is_windows_drive_prefix ( filename ) &&
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filename [ 2 ] == '\0' )
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return 1 ;
if ( strstart ( filename , " \\\\ . \\ " , NULL ) ||
strstart ( filename , "//./" , NULL ))
return 1 ;
return 0 ;
}
# endif
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static BlockDriver * find_protocol ( const char * filename )
{
BlockDriver * drv1 ;
char protocol [ 128 ];
int len ;
const char * p ;
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# ifdef _WIN32
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if ( is_windows_drive ( filename ) ||
is_windows_drive_prefix ( filename ))
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return & bdrv_raw ;
# endif
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p = strchr ( filename , ':' );
if ( ! p )
return & bdrv_raw ;
len = p - filename ;
if ( len > sizeof ( protocol ) - 1 )
len = sizeof ( protocol ) - 1 ;
memcpy ( protocol , filename , len );
protocol [ len ] = '\0' ;
for ( drv1 = first_drv ; drv1 != NULL ; drv1 = drv1 -> next ) {
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if ( drv1 -> protocol_name &&
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! strcmp ( drv1 -> protocol_name , protocol ))
return drv1 ;
}
return NULL ;
}
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/* XXX : force raw format if block or character device ? It would
simplify the BSD case */
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static BlockDriver * find_image_format ( const char * filename )
{
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int ret , score , score_max ;
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BlockDriver * drv1 , * drv ;
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uint8_t buf [ 2048 ] ;
BlockDriverState * bs ;
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/* detect host devices . By convention , / dev / cdrom [ N ] is always
recognized as a host CDROM */
if ( strstart ( filename , "/dev/cdrom" , NULL ))
return & bdrv_host_device ;
# ifdef _WIN32
if ( is_windows_drive ( filename ))
return & bdrv_host_device ;
# else
{
struct stat st ;
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if ( stat ( filename , & st ) >= 0 &&
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( S_ISCHR ( st . st_mode ) || S_ISBLK ( st . st_mode ))) {
return & bdrv_host_device ;
}
}
# endif
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drv = find_protocol ( filename ) ;
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/* no need to test disk image formats for vvfat */
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if ( drv == & bdrv_vvfat )
return drv ;
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ret = bdrv_file_open ( & bs , filename , BDRV_O_RDONLY ) ;
if ( ret < 0 )
return NULL ;
ret = bdrv_pread ( bs , 0 , buf , sizeof ( buf )) ;
bdrv_delete ( bs ) ;
if ( ret < 0 ) {
return NULL ;
}
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score_max = 0 ;
for ( drv1 = first_drv ; drv1 != NULL ; drv1 = drv1 -> next ) {
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if ( drv1 -> bdrv_probe ) {
score = drv1 -> bdrv_probe ( buf , ret , filename ) ;
if ( score > score_max ) {
score_max = score ;
drv = drv1 ;
}
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}
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}
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return drv ;
}
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int bdrv_file_open ( BlockDriverState ** pbs , const char * filename , int flags )
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{
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BlockDriverState * bs ;
int ret ;
bs = bdrv_new ( "" ) ;
ret = bdrv_open2 ( bs , filename , flags | BDRV_O_FILE , NULL ) ;
if ( ret < 0 ) {
bdrv_delete ( bs ) ;
return ret ;
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}
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bs -> growable = 1 ;
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* pbs = bs ;
return 0 ;
}
int bdrv_open ( BlockDriverState * bs , const char * filename , int flags )
{
return bdrv_open2 ( bs , filename , flags , NULL ) ;
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}
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int bdrv_open2 ( BlockDriverState * bs , const char * filename , int flags ,
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BlockDriver * drv )
{
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int ret , open_flags ;
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char tmp_filename [ PATH_MAX ] ;
char backing_filename [ PATH_MAX ] ;
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bs -> read_only = 0 ;
bs -> is_temporary = 0 ;
bs -> encrypted = 0 ;
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bs -> valid_key = 0 ;
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if ( flags & BDRV_O_SNAPSHOT ) {
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BlockDriverState * bs1 ;
int64_t total_size ;
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int is_protocol = 0 ;
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/* if snapshot , we create a temporary backing file and open it
instead of opening ' filename ' directly */
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/* if there is a backing file, use it */
bs1 = bdrv_new ( "" ) ;
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ret = bdrv_open ( bs1 , filename , 0 ) ;
if ( ret < 0 ) {
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bdrv_delete ( bs1 ) ;
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return ret ;
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}
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total_size = bdrv_getlength ( bs1 ) >> SECTOR_BITS ;
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if ( bs1 -> drv && bs1 -> drv -> protocol_name )
is_protocol = 1 ;
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bdrv_delete ( bs1 ) ;
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get_tmp_filename ( tmp_filename , sizeof ( tmp_filename )) ;
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/* Real path is meaningless for protocols */
if ( is_protocol )
snprintf ( backing_filename , sizeof ( backing_filename ),
"%s" , filename ) ;
else
realpath ( filename , backing_filename ) ;
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ret = bdrv_create ( & bdrv_qcow2 , tmp_filename ,
total_size , backing_filename , 0 ) ;
if ( ret < 0 ) {
return ret ;
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}
filename = tmp_filename ;
bs -> is_temporary = 1 ;
}
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pstrcpy ( bs -> filename , sizeof ( bs -> filename ), filename ) ;
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if ( flags & BDRV_O_FILE ) {
drv = find_protocol ( filename ) ;
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} else if ( ! drv ) {
drv = find_image_format ( filename ) ;
}
if ( ! drv ) {
ret = - ENOENT ;
goto unlink_and_fail ;
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}
bs -> drv = drv ;
bs -> opaque = qemu_mallocz ( drv -> instance_size ) ;
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/* Note : for compatibility , we open disk image files as RDWR , and
RDONLY as fallback */
if ( ! ( flags & BDRV_O_FILE ))
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open_flags = BDRV_O_RDWR | ( flags & BDRV_O_CACHE_MASK );
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else
open_flags = flags & ~ ( BDRV_O_FILE | BDRV_O_SNAPSHOT );
ret = drv -> bdrv_open ( bs , filename , open_flags );
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if (( ret == - EACCES || ret == - EPERM ) && ! ( flags & BDRV_O_FILE )) {
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ret = drv -> bdrv_open ( bs , filename , open_flags & ~ BDRV_O_RDWR );
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bs -> read_only = 1 ;
}
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if ( ret < 0 ) {
qemu_free ( bs -> opaque );
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bs -> opaque = NULL ;
bs -> drv = NULL ;
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unlink_and_fail :
if ( bs -> is_temporary )
unlink ( filename );
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return ret ;
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}
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if ( drv -> bdrv_getlength ) {
bs -> total_sectors = bdrv_getlength ( bs ) >> SECTOR_BITS ;
}
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# ifndef _WIN32
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if ( bs -> is_temporary ) {
unlink ( filename );
}
# endif
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if ( bs -> backing_file [ 0 ] != '\0' ) {
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/* if there is a backing file, use it */
bs -> backing_hd = bdrv_new ( "" );
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path_combine ( backing_filename , sizeof ( backing_filename ),
filename , bs -> backing_file );
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ret = bdrv_open ( bs -> backing_hd , backing_filename , open_flags );
if ( ret < 0 ) {
bdrv_close ( bs );
return ret ;
}
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}
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if ( ! bdrv_key_required ( bs )) {
/* call the change callback */
bs -> media_changed = 1 ;
if ( bs -> change_cb )
bs -> change_cb ( bs -> change_opaque );
}
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return 0 ;
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}
void bdrv_close ( BlockDriverState * bs )
{
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if ( bs -> drv ) {
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if ( bs -> backing_hd )
bdrv_delete ( bs -> backing_hd );
bs -> drv -> bdrv_close ( bs );
qemu_free ( bs -> opaque );
# ifdef _WIN32
if ( bs -> is_temporary ) {
unlink ( bs -> filename );
}
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# endif
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bs -> opaque = NULL ;
bs -> drv = NULL ;
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/* call the change callback */
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bs -> media_changed = 1 ;
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if ( bs -> change_cb )
bs -> change_cb ( bs -> change_opaque );
}
}
void bdrv_delete ( BlockDriverState * bs )
{
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BlockDriverState ** pbs ;
pbs = & bdrv_first ;
while ( * pbs != bs && * pbs != NULL )
pbs = & ( * pbs ) -> next ;
if ( * pbs == bs )
* pbs = bs -> next ;
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bdrv_close ( bs );
qemu_free ( bs );
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}
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/* commit COW file into the raw image */
int bdrv_commit ( BlockDriverState * bs )
{
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BlockDriver * drv = bs -> drv ;
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int64_t i , total_sectors ;
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int n , j ;
unsigned char sector [ 512 ];
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if ( ! drv )
return - ENOMEDIUM ;
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if ( bs -> read_only ) {
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return - EACCES ;
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}
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if ( ! bs -> backing_hd ) {
return - ENOTSUP ;
}
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total_sectors = bdrv_getlength ( bs ) >> SECTOR_BITS ;
for ( i = 0 ; i < total_sectors ;) {
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if ( drv -> bdrv_is_allocated ( bs , i , 65536 , & n )) {
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for ( j = 0 ; j < n ; j ++ ) {
if ( bdrv_read ( bs , i , sector , 1 ) != 0 ) {
return - EIO ;
}
if ( bdrv_write ( bs -> backing_hd , i , sector , 1 ) != 0 ) {
return - EIO ;
}
i ++ ;
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}
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} else {
i += n ;
}
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}
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if ( drv -> bdrv_make_empty )
return drv -> bdrv_make_empty ( bs );
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return 0 ;
}
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static int bdrv_check_byte_request ( BlockDriverState * bs , int64_t offset ,
size_t size )
{
int64_t len ;
if ( ! bdrv_is_inserted ( bs ))
return - ENOMEDIUM ;
if ( bs -> growable )
return 0 ;
len = bdrv_getlength ( bs );
if (( offset + size ) > len )
return - EIO ;
return 0 ;
}
static int bdrv_check_request ( BlockDriverState * bs , int64_t sector_num ,
int nb_sectors )
{
int64_t offset ;
/* Deal with byte accesses */
if ( sector_num < 0 )
offset = - sector_num ;
else
offset = sector_num * 512 ;
return bdrv_check_byte_request ( bs , offset , nb_sectors * 512 );
}
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/* return < 0 if error. See bdrv_write() for the return codes */
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int bdrv_read ( BlockDriverState * bs , int64_t sector_num ,
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uint8_t * buf , int nb_sectors )
{
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BlockDriver * drv = bs -> drv ;
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if ( ! drv )
return - ENOMEDIUM ;
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if ( bdrv_check_request ( bs , sector_num , nb_sectors ))
return - EIO ;
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if ( drv -> bdrv_pread ) {
int ret , len ;
len = nb_sectors * 512 ;
ret = drv -> bdrv_pread ( bs , sector_num * 512 , buf , len );
if ( ret < 0 )
return ret ;
else if ( ret != len )
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return - EINVAL ;
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else {
bs -> rd_bytes += ( unsigned ) len ;
bs -> rd_ops ++ ;
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return 0 ;
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}
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} else {
return drv -> bdrv_read ( bs , sector_num , buf , nb_sectors );
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}
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}
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/* Return < 0 if error . Important errors are :
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- EIO generic I / O error ( may happen for all errors )
- ENOMEDIUM No media inserted .
- EINVAL Invalid sector number or nb_sectors
- EACCES Trying to write a read - only device
*/
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int bdrv_write ( BlockDriverState * bs , int64_t sector_num ,
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const uint8_t * buf , int nb_sectors )
{
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BlockDriver * drv = bs -> drv ;
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if ( ! bs -> drv )
return - ENOMEDIUM ;
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if ( bs -> read_only )
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return - EACCES ;
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if ( bdrv_check_request ( bs , sector_num , nb_sectors ))
return - EIO ;
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if ( drv -> bdrv_pwrite ) {
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int ret , len , count = 0 ;
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len = nb_sectors * 512 ;
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do {
ret = drv -> bdrv_pwrite ( bs , sector_num * 512 , buf , len - count );
if ( ret < 0 ) {
printf ( "bdrv_write ret=%d \n " , ret );
return ret ;
}
count += ret ;
buf += ret ;
} while ( count != len );
bs -> wr_bytes += ( unsigned ) len ;
bs -> wr_ops ++ ;
return 0 ;
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}
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return drv -> bdrv_write ( bs , sector_num , buf , nb_sectors );
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}
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static int bdrv_pread_em ( BlockDriverState * bs , int64_t offset ,
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uint8_t * buf , int count1 )
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{
uint8_t tmp_buf [ SECTOR_SIZE ];
int len , nb_sectors , count ;
int64_t sector_num ;
count = count1 ;
/* first read to align to sector start */
len = ( SECTOR_SIZE - offset ) & ( SECTOR_SIZE - 1 );
if ( len > count )
len = count ;
sector_num = offset >> SECTOR_BITS ;
if ( len > 0 ) {
if ( bdrv_read ( bs , sector_num , tmp_buf , 1 ) < 0 )
return - EIO ;
memcpy ( buf , tmp_buf + ( offset & ( SECTOR_SIZE - 1 )), len );
count -= len ;
if ( count == 0 )
return count1 ;
sector_num ++ ;
buf += len ;
}
/* read the sectors "in place" */
nb_sectors = count >> SECTOR_BITS ;
if ( nb_sectors > 0 ) {
if ( bdrv_read ( bs , sector_num , buf , nb_sectors ) < 0 )
return - EIO ;
sector_num += nb_sectors ;
len = nb_sectors << SECTOR_BITS ;
buf += len ;
count -= len ;
}
/* add data from the last sector */
if ( count > 0 ) {
if ( bdrv_read ( bs , sector_num , tmp_buf , 1 ) < 0 )
return - EIO ;
memcpy ( buf , tmp_buf , count );
}
return count1 ;
}
ths
authored
18 years ago
669
static int bdrv_pwrite_em ( BlockDriverState * bs , int64_t offset ,
670
const uint8_t * buf , int count1 )
671
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{
uint8_t tmp_buf [ SECTOR_SIZE ];
int len , nb_sectors , count ;
int64_t sector_num ;
count = count1 ;
/* first write to align to sector start */
len = ( SECTOR_SIZE - offset ) & ( SECTOR_SIZE - 1 );
if ( len > count )
len = count ;
sector_num = offset >> SECTOR_BITS ;
if ( len > 0 ) {
if ( bdrv_read ( bs , sector_num , tmp_buf , 1 ) < 0 )
return - EIO ;
memcpy ( tmp_buf + ( offset & ( SECTOR_SIZE - 1 )), buf , len );
if ( bdrv_write ( bs , sector_num , tmp_buf , 1 ) < 0 )
return - EIO ;
count -= len ;
if ( count == 0 )
return count1 ;
sector_num ++ ;
buf += len ;
}
/* write the sectors "in place" */
nb_sectors = count >> SECTOR_BITS ;
if ( nb_sectors > 0 ) {
if ( bdrv_write ( bs , sector_num , buf , nb_sectors ) < 0 )
return - EIO ;
sector_num += nb_sectors ;
len = nb_sectors << SECTOR_BITS ;
buf += len ;
count -= len ;
}
/* add data from the last sector */
if ( count > 0 ) {
if ( bdrv_read ( bs , sector_num , tmp_buf , 1 ) < 0 )
return - EIO ;
memcpy ( tmp_buf , buf , count );
if ( bdrv_write ( bs , sector_num , tmp_buf , 1 ) < 0 )
return - EIO ;
}
return count1 ;
}
/**
ths
authored
18 years ago
718
* Read with byte offsets ( needed only for file protocols )
719
*/
ths
authored
18 years ago
720
int bdrv_pread ( BlockDriverState * bs , int64_t offset ,
721
722
723
724
725
void * buf1 , int count1 )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
726
return - ENOMEDIUM ;
727
728
729
if ( bdrv_check_byte_request ( bs , offset , count1 ))
return - EIO ;
730
if ( ! drv -> bdrv_pread )
731
return bdrv_pread_em ( bs , offset , buf1 , count1 );
732
733
734
return drv -> bdrv_pread ( bs , offset , buf1 , count1 );
}
ths
authored
18 years ago
735
736
/**
* Write with byte offsets ( needed only for file protocols )
737
*/
ths
authored
18 years ago
738
int bdrv_pwrite ( BlockDriverState * bs , int64_t offset ,
739
740
741
742
743
const void * buf1 , int count1 )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
744
return - ENOMEDIUM ;
745
746
747
if ( bdrv_check_byte_request ( bs , offset , count1 ))
return - EIO ;
748
if ( ! drv -> bdrv_pwrite )
749
return bdrv_pwrite_em ( bs , offset , buf1 , count1 );
750
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752
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754
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759
return drv -> bdrv_pwrite ( bs , offset , buf1 , count1 );
}
/**
* Truncate file to ' offset ' bytes ( needed only for file protocols )
*/
int bdrv_truncate ( BlockDriverState * bs , int64_t offset )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
760
return - ENOMEDIUM ;
761
762
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764
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766
767
768
769
770
771
772
if ( ! drv -> bdrv_truncate )
return - ENOTSUP ;
return drv -> bdrv_truncate ( bs , offset );
}
/**
* Length of a file in bytes . Return < 0 if error or unknown .
*/
int64_t bdrv_getlength ( BlockDriverState * bs )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
773
return - ENOMEDIUM ;
774
775
776
777
778
if ( ! drv -> bdrv_getlength ) {
/* legacy mode */
return bs -> total_sectors * SECTOR_SIZE ;
}
return drv -> bdrv_getlength ( bs );
779
780
}
781
/* return 0 as number of sectors if no device present or error */
ths
authored
17 years ago
782
void bdrv_get_geometry ( BlockDriverState * bs , uint64_t * nb_sectors_ptr )
783
{
784
785
786
787
788
789
790
int64_t length ;
length = bdrv_getlength ( bs );
if ( length < 0 )
length = 0 ;
else
length = length >> SECTOR_BITS ;
* nb_sectors_ptr = length ;
791
}
792
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813
struct partition {
uint8_t boot_ind ; /* 0x80 - active */
uint8_t head ; /* starting head */
uint8_t sector ; /* starting sector */
uint8_t cyl ; /* starting cylinder */
uint8_t sys_ind ; /* What partition type */
uint8_t end_head ; /* end head */
uint8_t end_sector ; /* end sector */
uint8_t end_cyl ; /* end cylinder */
uint32_t start_sect ; /* starting sector counting from 0 */
uint32_t nr_sects ; /* nr of sectors in partition */
} __attribute__ (( packed ));
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
static int guess_disk_lchs ( BlockDriverState * bs ,
int * pcylinders , int * pheads , int * psectors )
{
uint8_t buf [ 512 ];
int ret , i , heads , sectors , cylinders ;
struct partition * p ;
uint32_t nr_sects ;
814
uint64_t nb_sectors ;
815
816
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848
849
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852
853
bdrv_get_geometry ( bs , & nb_sectors );
ret = bdrv_read ( bs , 0 , buf , 1 );
if ( ret < 0 )
return - 1 ;
/* test msdos magic */
if ( buf [ 510 ] != 0x55 || buf [ 511 ] != 0xaa )
return - 1 ;
for ( i = 0 ; i < 4 ; i ++ ) {
p = (( struct partition * )( buf + 0x1be )) + i ;
nr_sects = le32_to_cpu ( p -> nr_sects );
if ( nr_sects && p -> end_head ) {
/* We make the assumption that the partition terminates on
a cylinder boundary */
heads = p -> end_head + 1 ;
sectors = p -> end_sector & 63 ;
if ( sectors == 0 )
continue ;
cylinders = nb_sectors / ( heads * sectors );
if ( cylinders < 1 || cylinders > 16383 )
continue ;
* pheads = heads ;
* psectors = sectors ;
* pcylinders = cylinders ;
# if 0
printf ( "guessed geometry: LCHS=%d %d %d \n " ,
cylinders , heads , sectors );
# endif
return 0 ;
}
}
return - 1 ;
}
void bdrv_guess_geometry ( BlockDriverState * bs , int * pcyls , int * pheads , int * psecs )
{
int translation , lba_detected = 0 ;
int cylinders , heads , secs ;
854
uint64_t nb_sectors ;
855
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908
/* if a geometry hint is available, use it */
bdrv_get_geometry ( bs , & nb_sectors );
bdrv_get_geometry_hint ( bs , & cylinders , & heads , & secs );
translation = bdrv_get_translation_hint ( bs );
if ( cylinders != 0 ) {
* pcyls = cylinders ;
* pheads = heads ;
* psecs = secs ;
} else {
if ( guess_disk_lchs ( bs , & cylinders , & heads , & secs ) == 0 ) {
if ( heads > 16 ) {
/* if heads > 16 , it means that a BIOS LBA
translation was active , so the default
hardware geometry is OK */
lba_detected = 1 ;
goto default_geometry ;
} else {
* pcyls = cylinders ;
* pheads = heads ;
* psecs = secs ;
/* disable any translation to be in sync with
the logical geometry */
if ( translation == BIOS_ATA_TRANSLATION_AUTO ) {
bdrv_set_translation_hint ( bs ,
BIOS_ATA_TRANSLATION_NONE );
}
}
} else {
default_geometry :
/* if no geometry, use a standard physical disk geometry */
cylinders = nb_sectors / ( 16 * 63 );
if ( cylinders > 16383 )
cylinders = 16383 ;
else if ( cylinders < 2 )
cylinders = 2 ;
* pcyls = cylinders ;
* pheads = 16 ;
* psecs = 63 ;
if (( lba_detected == 1 ) && ( translation == BIOS_ATA_TRANSLATION_AUTO )) {
if (( * pcyls * * pheads ) <= 131072 ) {
bdrv_set_translation_hint ( bs ,
BIOS_ATA_TRANSLATION_LARGE );
} else {
bdrv_set_translation_hint ( bs ,
BIOS_ATA_TRANSLATION_LBA );
}
}
}
bdrv_set_geometry_hint ( bs , * pcyls , * pheads , * psecs );
}
}
ths
authored
18 years ago
909
void bdrv_set_geometry_hint ( BlockDriverState * bs ,
910
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922
923
int cyls , int heads , int secs )
{
bs -> cyls = cyls ;
bs -> heads = heads ;
bs -> secs = secs ;
}
void bdrv_set_type_hint ( BlockDriverState * bs , int type )
{
bs -> type = type ;
bs -> removable = (( type == BDRV_TYPE_CDROM ||
type == BDRV_TYPE_FLOPPY ));
}
924
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926
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928
void bdrv_set_translation_hint ( BlockDriverState * bs , int translation )
{
bs -> translation = translation ;
}
ths
authored
18 years ago
929
void bdrv_get_geometry_hint ( BlockDriverState * bs ,
930
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937
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941
int * pcyls , int * pheads , int * psecs )
{
* pcyls = bs -> cyls ;
* pheads = bs -> heads ;
* psecs = bs -> secs ;
}
int bdrv_get_type_hint ( BlockDriverState * bs )
{
return bs -> type ;
}
942
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944
945
946
int bdrv_get_translation_hint ( BlockDriverState * bs )
{
return bs -> translation ;
}
947
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952
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956
int bdrv_is_removable ( BlockDriverState * bs )
{
return bs -> removable ;
}
int bdrv_is_read_only ( BlockDriverState * bs )
{
return bs -> read_only ;
}
ths
authored
17 years ago
957
958
959
960
961
int bdrv_is_sg ( BlockDriverState * bs )
{
return bs -> sg ;
}
962
/* XXX: no longer used */
ths
authored
18 years ago
963
void bdrv_set_change_cb ( BlockDriverState * bs ,
964
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void ( * change_cb )( void * opaque ), void * opaque )
{
bs -> change_cb = change_cb ;
bs -> change_opaque = opaque ;
}
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973
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975
976
int bdrv_is_encrypted ( BlockDriverState * bs )
{
if ( bs -> backing_hd && bs -> backing_hd -> encrypted )
return 1 ;
return bs -> encrypted ;
}
977
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980
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982
983
984
985
int bdrv_key_required ( BlockDriverState * bs )
{
BlockDriverState * backing_hd = bs -> backing_hd ;
if ( backing_hd && backing_hd -> encrypted && ! backing_hd -> valid_key )
return 1 ;
return ( bs -> encrypted && ! bs -> valid_key );
}
986
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997
int bdrv_set_key ( BlockDriverState * bs , const char * key )
{
int ret ;
if ( bs -> backing_hd && bs -> backing_hd -> encrypted ) {
ret = bdrv_set_key ( bs -> backing_hd , key );
if ( ret < 0 )
return ret ;
if ( ! bs -> encrypted )
return 0 ;
}
if ( ! bs -> encrypted || ! bs -> drv || ! bs -> drv -> bdrv_set_key )
return - 1 ;
998
ret = bs -> drv -> bdrv_set_key ( bs , key );
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1007
if ( ret < 0 ) {
bs -> valid_key = 0 ;
} else if ( ! bs -> valid_key ) {
bs -> valid_key = 1 ;
/* call the change callback now, we skipped it on open */
bs -> media_changed = 1 ;
if ( bs -> change_cb )
bs -> change_cb ( bs -> change_opaque );
}
1008
return ret ;
1009
1010
1011
1012
}
void bdrv_get_format ( BlockDriverState * bs , char * buf , int buf_size )
{
1013
if ( ! bs -> drv ) {
1014
1015
1016
1017
1018
1019
buf [ 0 ] = '\0' ;
} else {
pstrcpy ( buf , buf_size , bs -> drv -> format_name );
}
}
ths
authored
18 years ago
1020
void bdrv_iterate_format ( void ( * it )( void * opaque , const char * name ),
1021
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1024
1025
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1027
1028
1029
void * opaque )
{
BlockDriver * drv ;
for ( drv = first_drv ; drv != NULL ; drv = drv -> next ) {
it ( opaque , drv -> format_name );
}
}
1030
1031
1032
1033
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1035
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1037
1038
1039
1040
BlockDriverState * bdrv_find ( const char * name )
{
BlockDriverState * bs ;
for ( bs = bdrv_first ; bs != NULL ; bs = bs -> next ) {
if ( ! strcmp ( name , bs -> device_name ))
return bs ;
}
return NULL ;
}
1041
void bdrv_iterate ( void ( * it )( void * opaque , BlockDriverState * bs ), void * opaque )
1042
1043
1044
1045
{
BlockDriverState * bs ;
for ( bs = bdrv_first ; bs != NULL ; bs = bs -> next ) {
1046
it ( opaque , bs );
1047
1048
1049
}
}
1050
1051
1052
1053
1054
const char * bdrv_get_device_name ( BlockDriverState * bs )
{
return bs -> device_name ;
}
1055
1056
1057
1058
1059
1060
1061
1062
void bdrv_flush ( BlockDriverState * bs )
{
if ( bs -> drv -> bdrv_flush )
bs -> drv -> bdrv_flush ( bs );
if ( bs -> backing_hd )
bdrv_flush ( bs -> backing_hd );
}
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
void bdrv_flush_all ( void )
{
BlockDriverState * bs ;
for ( bs = bdrv_first ; bs != NULL ; bs = bs -> next )
if ( bs -> drv && ! bdrv_is_read_only ( bs ) &&
( ! bdrv_is_removable ( bs ) || bdrv_is_inserted ( bs )))
bdrv_flush ( bs );
}
ths
authored
17 years ago
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
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1099
/*
* Returns true iff the specified sector is present in the disk image . Drivers
* not implementing the functionality are assumed to not support backing files ,
* hence all their sectors are reported as allocated .
*
* ' pnum ' is set to the number of sectors ( including and immediately following
* the specified sector ) that are known to be in the same
* allocated / unallocated state .
*
* ' nb_sectors ' is the max value ' pnum ' should be set to .
*/
int bdrv_is_allocated ( BlockDriverState * bs , int64_t sector_num , int nb_sectors ,
int * pnum )
{
int64_t n ;
if ( ! bs -> drv -> bdrv_is_allocated ) {
if ( sector_num >= bs -> total_sectors ) {
* pnum = 0 ;
return 0 ;
}
n = bs -> total_sectors - sector_num ;
* pnum = ( n < nb_sectors ) ? ( n ) : ( nb_sectors );
return 1 ;
}
return bs -> drv -> bdrv_is_allocated ( bs , sector_num , nb_sectors , pnum );
}
1100
void bdrv_info ( Monitor * mon )
1101
1102
1103
1104
{
BlockDriverState * bs ;
for ( bs = bdrv_first ; bs != NULL ; bs = bs -> next ) {
1105
1106
monitor_printf ( mon , "%s:" , bs -> device_name );
monitor_printf ( mon , " type=" );
1107
1108
switch ( bs -> type ) {
case BDRV_TYPE_HD :
1109
monitor_printf ( mon , "hd" );
1110
1111
break ;
case BDRV_TYPE_CDROM :
1112
monitor_printf ( mon , "cdrom" );
1113
1114
break ;
case BDRV_TYPE_FLOPPY :
1115
monitor_printf ( mon , "floppy" );
1116
1117
break ;
}
1118
monitor_printf ( mon , " removable=%d" , bs -> removable );
1119
if ( bs -> removable ) {
1120
monitor_printf ( mon , " locked=%d" , bs -> locked );
1121
}
1122
if ( bs -> drv ) {
1123
1124
monitor_printf ( mon , " file=" );
monitor_print_filename ( mon , bs -> filename );
ths
authored
18 years ago
1125
if ( bs -> backing_file [ 0 ] != '\0' ) {
1126
1127
1128
1129
1130
1131
monitor_printf ( mon , " backing_file=" );
monitor_print_filename ( mon , bs -> backing_file );
}
monitor_printf ( mon , " ro=%d" , bs -> read_only );
monitor_printf ( mon , " drv=%s" , bs -> drv -> format_name );
monitor_printf ( mon , " encrypted=%d" , bdrv_is_encrypted ( bs ));
1132
} else {
1133
monitor_printf ( mon , " [not inserted]" );
1134
}
1135
monitor_printf ( mon , " \n " );
1136
1137
}
}
ths
authored
17 years ago
1138
1139
/* The "info blockstats" command. */
1140
void bdrv_info_stats ( Monitor * mon )
ths
authored
17 years ago
1141
1142
1143
1144
{
BlockDriverState * bs ;
for ( bs = bdrv_first ; bs != NULL ; bs = bs -> next ) {
1145
1146
1147
1148
1149
monitor_printf ( mon , "%s:"
" rd_bytes=%" PRIu64
" wr_bytes=%" PRIu64
" rd_operations=%" PRIu64
" wr_operations=%" PRIu64
1150
" \n " ,
1151
1152
1153
bs -> device_name ,
bs -> rd_bytes , bs -> wr_bytes ,
bs -> rd_ops , bs -> wr_ops );
ths
authored
17 years ago
1154
1155
}
}
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
const char * bdrv_get_encrypted_filename ( BlockDriverState * bs )
{
if ( bs -> backing_hd && bs -> backing_hd -> encrypted )
return bs -> backing_file ;
else if ( bs -> encrypted )
return bs -> filename ;
else
return NULL ;
}
ths
authored
18 years ago
1167
void bdrv_get_backing_filename ( BlockDriverState * bs ,
1168
1169
1170
1171
1172
1173
1174
1175
1176
char * filename , int filename_size )
{
if ( ! bs -> backing_hd ) {
pstrcpy ( filename , filename_size , "" );
} else {
pstrcpy ( filename , filename_size , bs -> backing_file );
}
}
ths
authored
18 years ago
1177
int bdrv_write_compressed ( BlockDriverState * bs , int64_t sector_num ,
1178
1179
1180
1181
const uint8_t * buf , int nb_sectors )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
1182
return - ENOMEDIUM ;
1183
1184
1185
1186
if ( ! drv -> bdrv_write_compressed )
return - ENOTSUP ;
return drv -> bdrv_write_compressed ( bs , sector_num , buf , nb_sectors );
}
ths
authored
18 years ago
1187
1188
1189
1190
1191
int bdrv_get_info ( BlockDriverState * bs , BlockDriverInfo * bdi )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
1192
return - ENOMEDIUM ;
1193
1194
1195
1196
1197
1198
1199
1200
1201
if ( ! drv -> bdrv_get_info )
return - ENOTSUP ;
memset ( bdi , 0 , sizeof ( * bdi ));
return drv -> bdrv_get_info ( bs , bdi );
}
/**************************************************************/
/* handling of snapshots */
ths
authored
18 years ago
1202
int bdrv_snapshot_create ( BlockDriverState * bs ,
1203
1204
1205
1206
QEMUSnapshotInfo * sn_info )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
1207
return - ENOMEDIUM ;
1208
1209
1210
1211
1212
if ( ! drv -> bdrv_snapshot_create )
return - ENOTSUP ;
return drv -> bdrv_snapshot_create ( bs , sn_info );
}
ths
authored
18 years ago
1213
int bdrv_snapshot_goto ( BlockDriverState * bs ,
1214
1215
1216
1217
const char * snapshot_id )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
1218
return - ENOMEDIUM ;
1219
1220
1221
1222
1223
1224
1225
1226
1227
if ( ! drv -> bdrv_snapshot_goto )
return - ENOTSUP ;
return drv -> bdrv_snapshot_goto ( bs , snapshot_id );
}
int bdrv_snapshot_delete ( BlockDriverState * bs , const char * snapshot_id )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
1228
return - ENOMEDIUM ;
1229
1230
1231
1232
1233
if ( ! drv -> bdrv_snapshot_delete )
return - ENOTSUP ;
return drv -> bdrv_snapshot_delete ( bs , snapshot_id );
}
ths
authored
18 years ago
1234
int bdrv_snapshot_list ( BlockDriverState * bs ,
1235
1236
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1238
QEMUSnapshotInfo ** psn_info )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
1239
return - ENOMEDIUM ;
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if ( ! drv -> bdrv_snapshot_list )
return - ENOTSUP ;
return drv -> bdrv_snapshot_list ( bs , psn_info );
}
# define NB_SUFFIXES 4
char * get_human_readable_size ( char * buf , int buf_size , int64_t size )
{
static const char suffixes [ NB_SUFFIXES ] = "KMGT" ;
int64_t base ;
int i ;
if ( size <= 999 ) {
snprintf ( buf , buf_size , "%" PRId64 , size );
} else {
base = 1024 ;
for ( i = 0 ; i < NB_SUFFIXES ; i ++ ) {
if ( size < ( 10 * base )) {
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authored
18 years ago
1259
snprintf ( buf , buf_size , "%0.1f%c" ,
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( double ) size / base ,
suffixes [ i ]);
break ;
} else if ( size < ( 1000 * base ) || i == ( NB_SUFFIXES - 1 )) {
ths
authored
18 years ago
1264
snprintf ( buf , buf_size , "%" PRId64 "%c" ,
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(( size + ( base >> 1 )) / base ),
suffixes [ i ]);
break ;
}
base = base * 1024 ;
}
}
return buf ;
}
char * bdrv_snapshot_dump ( char * buf , int buf_size , QEMUSnapshotInfo * sn )
{
char buf1 [ 128 ], date_buf [ 128 ], clock_buf [ 128 ];
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# ifdef _WIN32
struct tm * ptm ;
# else
1281
struct tm tm ;
1282
# endif
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time_t ti ;
int64_t secs ;
if ( ! sn ) {
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authored
18 years ago
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snprintf ( buf , buf_size ,
"%-10s%-20s%7s%20s%15s" ,
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"ID" , "TAG" , "VM SIZE" , "DATE" , "VM CLOCK" );
} else {
ti = sn -> date_sec ;
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# ifdef _WIN32
ptm = localtime ( & ti );
strftime ( date_buf , sizeof ( date_buf ),
"%Y-%m-%d %H:%M:%S" , ptm );
# else
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localtime_r ( & ti , & tm );
strftime ( date_buf , sizeof ( date_buf ),
"%Y-%m-%d %H:%M:%S" , & tm );
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# endif
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secs = sn -> vm_clock_nsec / 1000000000 ;
snprintf ( clock_buf , sizeof ( clock_buf ),
"%02d:%02d:%02d.%03d" ,
( int )( secs / 3600 ),
( int )(( secs / 60 ) % 60 ),
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authored
18 years ago
1306
( int )( secs % 60 ),
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( int )(( sn -> vm_clock_nsec / 1000000 ) % 1000 ));
snprintf ( buf , buf_size ,
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18 years ago
1309
"%-10s%-20s%7s%20s%15s" ,
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sn -> id_str , sn -> name ,
get_human_readable_size ( buf1 , sizeof ( buf1 ), sn -> vm_state_size ),
date_buf ,
clock_buf );
}
return buf ;
}
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/**************************************************************/
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/* async I/Os */
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typedef struct VectorTranslationState {
QEMUIOVector * iov ;
uint8_t * bounce ;
int is_write ;
BlockDriverAIOCB * aiocb ;
BlockDriverAIOCB * this_aiocb ;
} VectorTranslationState ;
static void bdrv_aio_rw_vector_cb ( void * opaque , int ret )
{
VectorTranslationState * s = opaque ;
if ( ! s -> is_write ) {
1335
qemu_iovec_from_buffer ( s -> iov , s -> bounce , s -> iov -> size );
1336
}
1337
qemu_vfree ( s -> bounce );
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s -> this_aiocb -> cb ( s -> this_aiocb -> opaque , ret );
qemu_aio_release ( s -> this_aiocb );
}
static BlockDriverAIOCB * bdrv_aio_rw_vector ( BlockDriverState * bs ,
int64_t sector_num ,
QEMUIOVector * iov ,
int nb_sectors ,
BlockDriverCompletionFunc * cb ,
void * opaque ,
int is_write )
{
VectorTranslationState * s = qemu_mallocz ( sizeof ( * s ));
BlockDriverAIOCB * aiocb = qemu_aio_get ( bs , cb , opaque );
s -> this_aiocb = aiocb ;
s -> iov = iov ;
s -> bounce = qemu_memalign ( 512 , nb_sectors * 512 );
s -> is_write = is_write ;
if ( is_write ) {
qemu_iovec_to_buffer ( s -> iov , s -> bounce );
s -> aiocb = bdrv_aio_write ( bs , sector_num , s -> bounce , nb_sectors ,
bdrv_aio_rw_vector_cb , s );
} else {
s -> aiocb = bdrv_aio_read ( bs , sector_num , s -> bounce , nb_sectors ,
bdrv_aio_rw_vector_cb , s );
}
return aiocb ;
}
BlockDriverAIOCB * bdrv_aio_readv ( BlockDriverState * bs , int64_t sector_num ,
QEMUIOVector * iov , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
{
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if ( bdrv_check_request ( bs , sector_num , nb_sectors ))
return NULL ;
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return bdrv_aio_rw_vector ( bs , sector_num , iov , nb_sectors ,
cb , opaque , 0 );
}
BlockDriverAIOCB * bdrv_aio_writev ( BlockDriverState * bs , int64_t sector_num ,
QEMUIOVector * iov , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
{
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if ( bdrv_check_request ( bs , sector_num , nb_sectors ))
return NULL ;
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return bdrv_aio_rw_vector ( bs , sector_num , iov , nb_sectors ,
cb , opaque , 1 );
}
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BlockDriverAIOCB * bdrv_aio_read ( BlockDriverState * bs , int64_t sector_num ,
uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
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{
BlockDriver * drv = bs -> drv ;
ths
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17 years ago
1396
BlockDriverAIOCB * ret ;
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if ( ! drv )
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return NULL ;
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if ( bdrv_check_request ( bs , sector_num , nb_sectors ))
return NULL ;
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18 years ago
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17 years ago
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ret = drv -> bdrv_aio_read ( bs , sector_num , buf , nb_sectors , cb , opaque );
if ( ret ) {
/* Update stats even though technically transfer has not happened. */
bs -> rd_bytes += ( unsigned ) nb_sectors * SECTOR_SIZE ;
bs -> rd_ops ++ ;
}
return ret ;
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}
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BlockDriverAIOCB * bdrv_aio_write ( BlockDriverState * bs , int64_t sector_num ,
const uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
1417
{
1418
BlockDriver * drv = bs -> drv ;
ths
authored
17 years ago
1419
BlockDriverAIOCB * ret ;
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if ( ! drv )
1422
return NULL ;
1423
if ( bs -> read_only )
1424
return NULL ;
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if ( bdrv_check_request ( bs , sector_num , nb_sectors ))
return NULL ;
1427
ths
authored
17 years ago
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ret = drv -> bdrv_aio_write ( bs , sector_num , buf , nb_sectors , cb , opaque );
if ( ret ) {
/* Update stats even though technically transfer has not happened. */
bs -> wr_bytes += ( unsigned ) nb_sectors * SECTOR_SIZE ;
bs -> wr_ops ++ ;
}
return ret ;
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}
void bdrv_aio_cancel ( BlockDriverAIOCB * acb )
{
1441
BlockDriver * drv = acb -> bs -> drv ;
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if ( acb -> cb == bdrv_aio_rw_vector_cb ) {
VectorTranslationState * s = acb -> opaque ;
acb = s -> aiocb ;
}
1448
drv -> bdrv_aio_cancel ( acb );
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}
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/**************************************************************/
/* async block device emulation */
1455
static void bdrv_aio_bh_cb ( void * opaque )
1456
{
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1459
BlockDriverAIOCBSync * acb = opaque ;
acb -> common . cb ( acb -> common . opaque , acb -> ret );
qemu_aio_release ( acb );
1460
}
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static BlockDriverAIOCB * bdrv_aio_read_em ( BlockDriverState * bs ,
int64_t sector_num , uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
1465
{
1466
BlockDriverAIOCBSync * acb ;
1467
int ret ;
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acb = qemu_aio_get ( bs , cb , opaque );
if ( ! acb -> bh )
acb -> bh = qemu_bh_new ( bdrv_aio_bh_cb , acb );
ret = bdrv_read ( bs , sector_num , buf , nb_sectors );
acb -> ret = ret ;
qemu_bh_schedule ( acb -> bh );
return & acb -> common ;
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}
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static BlockDriverAIOCB * bdrv_aio_write_em ( BlockDriverState * bs ,
int64_t sector_num , const uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
1481
{
1482
BlockDriverAIOCBSync * acb ;
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1484
int ret ;
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acb = qemu_aio_get ( bs , cb , opaque );
if ( ! acb -> bh )
acb -> bh = qemu_bh_new ( bdrv_aio_bh_cb , acb );
ret = bdrv_write ( bs , sector_num , buf , nb_sectors );
acb -> ret = ret ;
qemu_bh_schedule ( acb -> bh );
return & acb -> common ;
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1493
}
1494
static void bdrv_aio_cancel_em ( BlockDriverAIOCB * blockacb )
1495
{
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1498
BlockDriverAIOCBSync * acb = ( BlockDriverAIOCBSync * ) blockacb ;
qemu_bh_cancel ( acb -> bh );
qemu_aio_release ( acb );
1499
}
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/**************************************************************/
/* sync block device emulation */
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static void bdrv_rw_em_cb ( void * opaque , int ret )
{
* ( int * ) opaque = ret ;
1507
1508
}
1509
1510
# define NOT_DONE 0x7fffffff
ths
authored
18 years ago
1511
static int bdrv_read_em ( BlockDriverState * bs , int64_t sector_num ,
1512
uint8_t * buf , int nb_sectors )
1513
{
1514
1515
int async_ret ;
BlockDriverAIOCB * acb ;
1516
1517
async_ret = NOT_DONE ;
ths
authored
18 years ago
1518
acb = bdrv_aio_read ( bs , sector_num , buf , nb_sectors ,
1519
bdrv_rw_em_cb , & async_ret );
1520
if ( acb == NULL )
1521
return - 1 ;
1522
1523
1524
1525
while ( async_ret == NOT_DONE ) {
qemu_aio_wait ();
}
1526
1527
return async_ret ;
1528
1529
}
1530
1531
1532
static int bdrv_write_em ( BlockDriverState * bs , int64_t sector_num ,
const uint8_t * buf , int nb_sectors )
{
1533
1534
int async_ret ;
BlockDriverAIOCB * acb ;
1535
1536
async_ret = NOT_DONE ;
ths
authored
18 years ago
1537
acb = bdrv_aio_write ( bs , sector_num , buf , nb_sectors ,
1538
bdrv_rw_em_cb , & async_ret );
1539
if ( acb == NULL )
1540
return - 1 ;
1541
1542
1543
1544
1545
while ( async_ret == NOT_DONE ) {
qemu_aio_wait ();
}
return async_ret ;
}
1546
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void bdrv_init ( void )
{
bdrv_register ( & bdrv_raw );
1550
bdrv_register ( & bdrv_host_device );
1551
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1555
# ifndef _WIN32
bdrv_register ( & bdrv_cow );
# endif
bdrv_register ( & bdrv_qcow );
bdrv_register ( & bdrv_vmdk );
1556
bdrv_register ( & bdrv_cloop );
1557
bdrv_register ( & bdrv_dmg );
1558
bdrv_register ( & bdrv_bochs );
1559
bdrv_register ( & bdrv_vpc );
1560
bdrv_register ( & bdrv_vvfat );
1561
bdrv_register ( & bdrv_qcow2 );
ths
authored
18 years ago
1562
bdrv_register ( & bdrv_parallels );
ths
authored
17 years ago
1563
bdrv_register ( & bdrv_nbd );
1564
}
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void * qemu_aio_get ( BlockDriverState * bs , BlockDriverCompletionFunc * cb ,
void * opaque )
{
BlockDriver * drv ;
BlockDriverAIOCB * acb ;
drv = bs -> drv ;
if ( drv -> free_aiocb ) {
acb = drv -> free_aiocb ;
drv -> free_aiocb = acb -> next ;
} else {
acb = qemu_mallocz ( drv -> aiocb_size );
}
acb -> bs = bs ;
acb -> cb = cb ;
acb -> opaque = opaque ;
return acb ;
}
void qemu_aio_release ( void * p )
{
BlockDriverAIOCB * acb = p ;
BlockDriver * drv = acb -> bs -> drv ;
acb -> next = drv -> free_aiocb ;
drv -> free_aiocb = acb ;
}
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1611
1612
/**************************************************************/
/* removable device support */
/**
* Return TRUE if the media is present
*/
int bdrv_is_inserted ( BlockDriverState * bs )
{
BlockDriver * drv = bs -> drv ;
int ret ;
if ( ! drv )
return 0 ;
if ( ! drv -> bdrv_is_inserted )
return 1 ;
ret = drv -> bdrv_is_inserted ( bs );
return ret ;
}
/**
* Return TRUE if the media changed since the last call to this
ths
authored
18 years ago
1613
* function . It is currently only used for floppy disks
1614
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1666
*/
int bdrv_media_changed ( BlockDriverState * bs )
{
BlockDriver * drv = bs -> drv ;
int ret ;
if ( ! drv || ! drv -> bdrv_media_changed )
ret = - ENOTSUP ;
else
ret = drv -> bdrv_media_changed ( bs );
if ( ret == - ENOTSUP )
ret = bs -> media_changed ;
bs -> media_changed = 0 ;
return ret ;
}
/**
* If eject_flag is TRUE , eject the media . Otherwise , close the tray
*/
void bdrv_eject ( BlockDriverState * bs , int eject_flag )
{
BlockDriver * drv = bs -> drv ;
int ret ;
if ( ! drv || ! drv -> bdrv_eject ) {
ret = - ENOTSUP ;
} else {
ret = drv -> bdrv_eject ( bs , eject_flag );
}
if ( ret == - ENOTSUP ) {
if ( eject_flag )
bdrv_close ( bs );
}
}
int bdrv_is_locked ( BlockDriverState * bs )
{
return bs -> locked ;
}
/**
* Lock or unlock the media ( if it is locked , the user won ' t be able
* to eject it manually ).
*/
void bdrv_set_locked ( BlockDriverState * bs , int locked )
{
BlockDriver * drv = bs -> drv ;
bs -> locked = locked ;
if ( drv && drv -> bdrv_set_locked ) {
drv -> bdrv_set_locked ( bs , locked );
}
}
ths
authored
17 years ago
1667
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/* needed for generic scsi interface */
int bdrv_ioctl ( BlockDriverState * bs , unsigned long int req , void * buf )
{
BlockDriver * drv = bs -> drv ;
if ( drv && drv -> bdrv_ioctl )
return drv -> bdrv_ioctl ( bs , req , buf );
return - ENOTSUP ;
}
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1699
int bdrv_sg_send_command ( BlockDriverState * bs , void * buf , int count )
{
return bdrv_pwrite ( bs , - 1 , buf , count );
}
int bdrv_sg_recv_response ( BlockDriverState * bs , void * buf , int count )
{
return bdrv_pread ( bs , - 1 , buf , count );
}
BlockDriverAIOCB * bdrv_sg_aio_read ( BlockDriverState * bs , void * buf , int count ,
BlockDriverCompletionFunc * cb , void * opaque )
{
return bdrv_aio_read ( bs , 0 , buf , - ( int64_t ) count , cb , opaque );
}
BlockDriverAIOCB * bdrv_sg_aio_write ( BlockDriverState * bs , void * buf , int count ,
BlockDriverCompletionFunc * cb , void * opaque )
{
return bdrv_aio_write ( bs , 0 , buf , - ( int64_t ) count , cb , opaque );
}