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Ensure space for EBR when resizing Extended partition (#664050) 

When resizing an extended boot record we must ensure that at least 2
sectors is reserved in front of the nearest logical partition for the
Extended Boot Record.

Please note that unless specifically told otherwise, the Linux kernel
considers Extended Boot Records to be two sectors long, in order to
"leave room for LILO".

Closes Bug #664050 - Unable to resize extended partition
This commit is contained in:
Curtis Gedak 2012-03-17 13:20:01 -06:00
parent 57ee0a1638
commit bee2a643e2
1 changed files with 39 additions and 1 deletions
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40
src/GParted_Core.cc
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@ -463,8 +463,10 @@ bool GParted_Core::snap_to_mebibyte( const Device & device, Partition & partitio
}
}
//Align start sector
//Calculate difference offset from Mebibyte boundary
diff = Sector(partition .sector_start % ( MEBIBYTE / partition .sector_size ));
//Align start sector only if permitted to change start sector
if ( diff && ( (! partition .strict_start)
|| ( partition .strict_start
&& ( partition .status == STAT_NEW
@ -473,8 +475,44 @@ bool GParted_Core::snap_to_mebibyte( const Device & device, Partition & partitio
)
)
)
{
partition .sector_start += ( (MEBIBYTE / partition .sector_size) - diff) ;
//If this is an extended partition then check to see if sufficient space is
// available for any following logical partition Extended Boot Record
if ( partition .type == TYPE_EXTENDED )
{
//Locate the extended partition that contains the logical partitions.
int index_extended = -1 ;
for ( unsigned int t = 0 ; t < device .partitions .size() ; t++ )
{
if ( device .partitions[ t ] .type == TYPE_EXTENDED )
index_extended = t ;
}
//If there is logical partition that starts less than 2 sectors
// from the start of this partition, then reserve a mebibyte for the EBR.
if ( index_extended != -1 )
{
for ( unsigned int t = 0; t < device .partitions[ index_extended ] .logicals .size(); t++ )
{
if ( ( device .partitions[ index_extended ] .logicals[ t ] .type == TYPE_LOGICAL )
&& ( ( ( device .partitions[ index_extended ] .logicals[ t ] .sector_start )
- ( partition .sector_start )
)
//Unless specifically told otherwise, the Linux kernel considers extended
// boot records to be two sectors long, in order to "leave room for LILO".
< 2
)
)
{
partition .sector_start -= (MEBIBYTE / partition .sector_size) ;
}
}
}
}
}
//If this is a logical partition not at end of drive then check to see if space is
// required for a following logical partition Extended Boot Record
if ( partition .type == TYPE_LOGICAL )