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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 "qemu-common.h"
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# include "console.h"
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# include "block_int.h"
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# ifdef _BSD
# include < sys / types . h >
# include < sys / stat . h >
# include < sys / ioctl . h >
# include < sys / queue . h >
# include < sys / disk . 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 ));
if ( ! bs )
return NULL ;
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 ( "" ) ;
if ( ! bs )
return - ENOMEM ;
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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* 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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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 ( "" ) ;
if ( ! bs1 ) {
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return - ENOMEM ;
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}
if ( bdrv_open ( bs1 , filename , 0 ) < 0 ) {
bdrv_delete ( bs1 ) ;
return - 1 ;
}
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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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if ( bdrv_create ( & bdrv_qcow2 , tmp_filename ,
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total_size , backing_filename , 0 ) < 0 ) {
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return - 1 ;
}
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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if ( ! drv )
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return - ENOENT ;
} else {
if ( ! drv ) {
drv = find_image_format ( filename ) ;
if ( ! drv )
return - 1 ;
}
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}
bs -> drv = drv ;
bs -> opaque = qemu_mallocz ( drv -> instance_size ) ;
if ( bs -> opaque == NULL && drv -> instance_size > 0 )
return - 1 ;
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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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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 ( "" );
if ( ! bs -> backing_hd ) {
fail :
bdrv_close ( bs );
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return - ENOMEM ;
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}
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path_combine ( backing_filename , sizeof ( backing_filename ),
filename , bs -> backing_file );
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if ( bdrv_open ( bs -> backing_hd , backing_filename , open_flags ) < 0 )
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goto fail ;
}
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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 );
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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/* 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 ( 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 ( drv -> bdrv_pwrite ) {
int ret , len ;
len = nb_sectors * 512 ;
ret = drv -> bdrv_pwrite ( bs , sector_num * 512 , buf , len );
if ( ret < 0 )
return ret ;
else if ( ret != len )
return - EIO ;
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else {
bs -> wr_bytes += ( unsigned ) len ;
bs -> wr_ops ++ ;
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return 0 ;
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}
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} else {
return drv -> bdrv_write ( bs , sector_num , buf , nb_sectors );
}
}
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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 ;
}
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static int bdrv_pwrite_em ( BlockDriverState * bs , int64_t offset ,
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const 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 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
673
* Read with byte offsets ( needed only for file protocols )
674
*/
ths
authored
18 years ago
675
int bdrv_pread ( BlockDriverState * bs , int64_t offset ,
676
677
678
679
680
void * buf1 , int count1 )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
681
return - ENOMEDIUM ;
682
if ( ! drv -> bdrv_pread )
683
return bdrv_pread_em ( bs , offset , buf1 , count1 );
684
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return drv -> bdrv_pread ( bs , offset , buf1 , count1 );
}
ths
authored
18 years ago
687
688
/**
* Write with byte offsets ( needed only for file protocols )
689
*/
ths
authored
18 years ago
690
int bdrv_pwrite ( BlockDriverState * bs , int64_t offset ,
691
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693
694
695
const void * buf1 , int count1 )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
696
return - ENOMEDIUM ;
697
if ( ! drv -> bdrv_pwrite )
698
return bdrv_pwrite_em ( bs , offset , buf1 , count1 );
699
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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 )
709
return - ENOMEDIUM ;
710
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718
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720
721
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 )
722
return - ENOMEDIUM ;
723
724
725
726
727
if ( ! drv -> bdrv_getlength ) {
/* legacy mode */
return bs -> total_sectors * SECTOR_SIZE ;
}
return drv -> bdrv_getlength ( bs );
728
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}
730
/* return 0 as number of sectors if no device present or error */
ths
authored
17 years ago
731
void bdrv_get_geometry ( BlockDriverState * bs , uint64_t * nb_sectors_ptr )
732
{
733
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735
736
737
738
739
int64_t length ;
length = bdrv_getlength ( bs );
if ( length < 0 )
length = 0 ;
else
length = length >> SECTOR_BITS ;
* nb_sectors_ptr = length ;
740
}
741
ths
authored
18 years ago
742
void bdrv_set_geometry_hint ( BlockDriverState * bs ,
743
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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 ));
}
757
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760
761
void bdrv_set_translation_hint ( BlockDriverState * bs , int translation )
{
bs -> translation = translation ;
}
ths
authored
18 years ago
762
void bdrv_get_geometry_hint ( BlockDriverState * bs ,
763
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766
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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 ;
}
775
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int bdrv_get_translation_hint ( BlockDriverState * bs )
{
return bs -> translation ;
}
780
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786
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788
789
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
790
791
792
793
794
int bdrv_is_sg ( BlockDriverState * bs )
{
return bs -> sg ;
}
795
/* XXX: no longer used */
ths
authored
18 years ago
796
void bdrv_set_change_cb ( BlockDriverState * bs ,
797
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799
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801
802
void ( * change_cb )( void * opaque ), void * opaque )
{
bs -> change_cb = change_cb ;
bs -> change_opaque = opaque ;
}
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811
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826
int bdrv_is_encrypted ( BlockDriverState * bs )
{
if ( bs -> backing_hd && bs -> backing_hd -> encrypted )
return 1 ;
return bs -> encrypted ;
}
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 ;
return bs -> drv -> bdrv_set_key ( bs , key );
}
void bdrv_get_format ( BlockDriverState * bs , char * buf , int buf_size )
{
827
if ( ! bs -> drv ) {
828
829
830
831
832
833
buf [ 0 ] = '\0' ;
} else {
pstrcpy ( buf , buf_size , bs -> drv -> format_name );
}
}
ths
authored
18 years ago
834
void bdrv_iterate_format ( void ( * it )( void * opaque , const char * name ),
835
836
837
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839
840
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843
void * opaque )
{
BlockDriver * drv ;
for ( drv = first_drv ; drv != NULL ; drv = drv -> next ) {
it ( opaque , drv -> format_name );
}
}
844
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853
854
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 ;
}
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void bdrv_iterate ( void ( * it )( void * opaque , const char * name ), void * opaque )
{
BlockDriverState * bs ;
for ( bs = bdrv_first ; bs != NULL ; bs = bs -> next ) {
it ( opaque , bs -> device_name );
}
}
864
865
866
867
868
const char * bdrv_get_device_name ( BlockDriverState * bs )
{
return bs -> device_name ;
}
869
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874
875
876
void bdrv_flush ( BlockDriverState * bs )
{
if ( bs -> drv -> bdrv_flush )
bs -> drv -> bdrv_flush ( bs );
if ( bs -> backing_hd )
bdrv_flush ( bs -> backing_hd );
}
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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
887
888
889
890
891
892
893
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895
896
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901
902
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904
905
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911
912
913
/*
* 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 );
}
914
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931
932
933
934
935
void bdrv_info ( void )
{
BlockDriverState * bs ;
for ( bs = bdrv_first ; bs != NULL ; bs = bs -> next ) {
term_printf ( "%s:" , bs -> device_name );
term_printf ( " type=" );
switch ( bs -> type ) {
case BDRV_TYPE_HD :
term_printf ( "hd" );
break ;
case BDRV_TYPE_CDROM :
term_printf ( "cdrom" );
break ;
case BDRV_TYPE_FLOPPY :
term_printf ( "floppy" );
break ;
}
term_printf ( " removable=%d" , bs -> removable );
if ( bs -> removable ) {
term_printf ( " locked=%d" , bs -> locked );
}
936
if ( bs -> drv ) {
ths
authored
18 years ago
937
938
939
940
941
942
term_printf ( " file=" );
term_print_filename ( bs -> filename );
if ( bs -> backing_file [ 0 ] != '\0' ) {
term_printf ( " backing_file=" );
term_print_filename ( bs -> backing_file );
}
943
term_printf ( " ro=%d" , bs -> read_only );
944
945
946
term_printf ( " drv=%s" , bs -> drv -> format_name );
if ( bs -> encrypted )
term_printf ( " encrypted" );
947
948
949
950
951
952
} else {
term_printf ( " [not inserted]" );
}
term_printf ( " \n " );
}
}
ths
authored
17 years ago
953
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957
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960
961
962
963
964
965
966
967
968
969
970
/* The "info blockstats" command. */
void bdrv_info_stats ( void )
{
BlockDriverState * bs ;
for ( bs = bdrv_first ; bs != NULL ; bs = bs -> next ) {
term_printf ( "%s:"
" rd_bytes=%" PRIu64
" wr_bytes=%" PRIu64
" rd_operations=%" PRIu64
" wr_operations=%" PRIu64
" \n " ,
bs -> device_name ,
bs -> rd_bytes , bs -> wr_bytes ,
bs -> rd_ops , bs -> wr_ops );
}
}
971
ths
authored
18 years ago
972
void bdrv_get_backing_filename ( BlockDriverState * bs ,
973
974
975
976
977
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979
980
981
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
982
int bdrv_write_compressed ( BlockDriverState * bs , int64_t sector_num ,
983
984
985
986
const uint8_t * buf , int nb_sectors )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
987
return - ENOMEDIUM ;
988
989
990
991
if ( ! drv -> bdrv_write_compressed )
return - ENOTSUP ;
return drv -> bdrv_write_compressed ( bs , sector_num , buf , nb_sectors );
}
ths
authored
18 years ago
992
993
994
995
996
int bdrv_get_info ( BlockDriverState * bs , BlockDriverInfo * bdi )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
997
return - ENOMEDIUM ;
998
999
1000
1001
1002
1003
1004
1005
1006
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
1007
int bdrv_snapshot_create ( BlockDriverState * bs ,
1008
1009
1010
1011
QEMUSnapshotInfo * sn_info )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
1012
return - ENOMEDIUM ;
1013
1014
1015
1016
1017
if ( ! drv -> bdrv_snapshot_create )
return - ENOTSUP ;
return drv -> bdrv_snapshot_create ( bs , sn_info );
}
ths
authored
18 years ago
1018
int bdrv_snapshot_goto ( BlockDriverState * bs ,
1019
1020
1021
1022
const char * snapshot_id )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
1023
return - ENOMEDIUM ;
1024
1025
1026
1027
1028
1029
1030
1031
1032
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 )
1033
return - ENOMEDIUM ;
1034
1035
1036
1037
1038
if ( ! drv -> bdrv_snapshot_delete )
return - ENOTSUP ;
return drv -> bdrv_snapshot_delete ( bs , snapshot_id );
}
ths
authored
18 years ago
1039
int bdrv_snapshot_list ( BlockDriverState * bs ,
1040
1041
1042
1043
QEMUSnapshotInfo ** psn_info )
{
BlockDriver * drv = bs -> drv ;
if ( ! drv )
1044
return - ENOMEDIUM ;
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
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 )) {
ths
authored
18 years ago
1064
snprintf ( buf , buf_size , "%0.1f%c" ,
1065
1066
1067
1068
( double ) size / base ,
suffixes [ i ]);
break ;
} else if ( size < ( 1000 * base ) || i == ( NB_SUFFIXES - 1 )) {
ths
authored
18 years ago
1069
snprintf ( buf , buf_size , "%" PRId64 "%c" ,
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
(( 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 ];
1083
1084
1085
# ifdef _WIN32
struct tm * ptm ;
# else
1086
struct tm tm ;
1087
# endif
1088
1089
1090
1091
time_t ti ;
int64_t secs ;
if ( ! sn ) {
ths
authored
18 years ago
1092
1093
snprintf ( buf , buf_size ,
"%-10s%-20s%7s%20s%15s" ,
1094
1095
1096
"ID" , "TAG" , "VM SIZE" , "DATE" , "VM CLOCK" );
} else {
ti = sn -> date_sec ;
1097
1098
1099
1100
1101
# ifdef _WIN32
ptm = localtime ( & ti );
strftime ( date_buf , sizeof ( date_buf ),
"%Y-%m-%d %H:%M:%S" , ptm );
# else
1102
1103
1104
localtime_r ( & ti , & tm );
strftime ( date_buf , sizeof ( date_buf ),
"%Y-%m-%d %H:%M:%S" , & tm );
1105
# endif
1106
1107
1108
1109
1110
secs = sn -> vm_clock_nsec / 1000000000 ;
snprintf ( clock_buf , sizeof ( clock_buf ),
"%02d:%02d:%02d.%03d" ,
( int )( secs / 3600 ),
( int )(( secs / 60 ) % 60 ),
ths
authored
18 years ago
1111
( int )( secs % 60 ),
1112
1113
( int )(( sn -> vm_clock_nsec / 1000000 ) % 1000 ));
snprintf ( buf , buf_size ,
ths
authored
18 years ago
1114
"%-10s%-20s%7s%20s%15s" ,
1115
1116
1117
1118
1119
1120
1121
1122
sn -> id_str , sn -> name ,
get_human_readable_size ( buf1 , sizeof ( buf1 ), sn -> vm_state_size ),
date_buf ,
clock_buf );
}
return buf ;
}
1123
1124
/**************************************************************/
1125
/* async I/Os */
1126
1127
1128
1129
BlockDriverAIOCB * bdrv_aio_read ( BlockDriverState * bs , int64_t sector_num ,
uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
1130
1131
{
BlockDriver * drv = bs -> drv ;
ths
authored
17 years ago
1132
BlockDriverAIOCB * ret ;
1133
1134
if ( ! drv )
1135
return NULL ;
ths
authored
18 years ago
1136
ths
authored
17 years ago
1137
1138
1139
1140
1141
1142
1143
1144
1145
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 ;
1146
1147
}
1148
1149
1150
BlockDriverAIOCB * bdrv_aio_write ( BlockDriverState * bs , int64_t sector_num ,
const uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
1151
{
1152
BlockDriver * drv = bs -> drv ;
ths
authored
17 years ago
1153
BlockDriverAIOCB * ret ;
1154
1155
if ( ! drv )
1156
return NULL ;
1157
if ( bs -> read_only )
1158
return NULL ;
1159
ths
authored
17 years ago
1160
1161
1162
1163
1164
1165
1166
1167
1168
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 ;
1169
1170
1171
1172
}
void bdrv_aio_cancel ( BlockDriverAIOCB * acb )
{
1173
BlockDriver * drv = acb -> bs -> drv ;
1174
1175
drv -> bdrv_aio_cancel ( acb );
1176
1177
}
1178
1179
1180
1181
/**************************************************************/
/* async block device emulation */
1182
static void bdrv_aio_bh_cb ( void * opaque )
1183
{
1184
1185
1186
BlockDriverAIOCBSync * acb = opaque ;
acb -> common . cb ( acb -> common . opaque , acb -> ret );
qemu_aio_release ( acb );
1187
}
1188
1189
1190
1191
static BlockDriverAIOCB * bdrv_aio_read_em ( BlockDriverState * bs ,
int64_t sector_num , uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
1192
{
1193
BlockDriverAIOCBSync * acb ;
1194
int ret ;
1195
1196
1197
1198
1199
1200
1201
1202
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 ;
1203
1204
}
1205
1206
1207
static BlockDriverAIOCB * bdrv_aio_write_em ( BlockDriverState * bs ,
int64_t sector_num , const uint8_t * buf , int nb_sectors ,
BlockDriverCompletionFunc * cb , void * opaque )
1208
{
1209
BlockDriverAIOCBSync * acb ;
1210
1211
int ret ;
1212
1213
1214
1215
1216
1217
1218
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 ;
1219
1220
}
1221
static void bdrv_aio_cancel_em ( BlockDriverAIOCB * blockacb )
1222
{
1223
1224
1225
BlockDriverAIOCBSync * acb = ( BlockDriverAIOCBSync * ) blockacb ;
qemu_bh_cancel ( acb -> bh );
qemu_aio_release ( acb );
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}
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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 ;
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}
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# define NOT_DONE 0x7fffffff
ths
authored
18 years ago
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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 )
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{
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int async_ret ;
BlockDriverAIOCB * acb ;
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async_ret = NOT_DONE ;
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authored
18 years ago
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acb = bdrv_aio_read ( bs , sector_num , buf , nb_sectors ,
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bdrv_rw_em_cb , & async_ret );
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if ( acb == NULL )
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return - 1 ;
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while ( async_ret == NOT_DONE ) {
qemu_aio_wait ();
}
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return async_ret ;
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}
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static int bdrv_write_em ( BlockDriverState * bs , int64_t sector_num ,
const uint8_t * buf , int nb_sectors )
{
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int async_ret ;
BlockDriverAIOCB * acb ;
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async_ret = NOT_DONE ;
ths
authored
18 years ago
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acb = bdrv_aio_write ( bs , sector_num , buf , nb_sectors ,
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bdrv_rw_em_cb , & async_ret );
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if ( acb == NULL )
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return - 1 ;
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while ( async_ret == NOT_DONE ) {
qemu_aio_wait ();
}
return async_ret ;
}
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void bdrv_init ( void )
{
bdrv_register ( & bdrv_raw );
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bdrv_register ( & bdrv_host_device );
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# ifndef _WIN32
bdrv_register ( & bdrv_cow );
# endif
bdrv_register ( & bdrv_qcow );
bdrv_register ( & bdrv_vmdk );
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bdrv_register ( & bdrv_cloop );
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bdrv_register ( & bdrv_dmg );
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bdrv_register ( & bdrv_bochs );
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bdrv_register ( & bdrv_vpc );
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bdrv_register ( & bdrv_vvfat );
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bdrv_register ( & bdrv_qcow2 );
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authored
18 years ago
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bdrv_register ( & bdrv_parallels );
ths
authored
17 years ago
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bdrv_register ( & bdrv_nbd );
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}
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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 );
if ( ! acb )
return NULL ;
}
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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/**************************************************************/
/* 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
1342
* function . It is currently only used for floppy disks
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*/
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
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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 ;
}