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Improved math for rounding starting sector to cylinder boundaries for logical partitions, and the first primary partition for MBR and GPT partition tables. This fixes a problem where a resize operation could turn into a move due to problems with the snap_to_cylinder function. 

svn path=/trunk/; revision=857
This commit is contained in:
Curtis Gedak 2008-06-15 17:57:48 +00:00
parent b10f2325d7
commit af8a021e89
2 changed files with 25 additions and 5 deletions
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8
ChangeLog
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@ -1,10 +1,16 @@
2008-06-15 Curtis Gedak <gedakc@gmail.com>
* src/GParted_Core.cc: Enhanced snap-to-cylinder math
- Improved math for rounding starting sector to cylinder
boundaries for logical partitions, and the first primary
partition for MBR and GPT partition tables.
- Closes GParted bug #432525
* include/Dialog_Base_Partition.h,
src/Dialog_Base_Partition.cc,
include/Dialog_Partition_New.h,
src/Dialog_Partition_New.cc: Migrated checkbutton.
- Moved "Round to cylinders" checkbutton from partition New
- Moved "Round to cylinders" checkbutton from partition new
dialog to partition base dialog so that it may be used
by all inheritors (e.g., New, Copy, and Resize/Move).

20
src/GParted_Core.cc
View File

@ -250,9 +250,23 @@ bool GParted_Core::snap_to_cylinder( const Device & device, Partition & partitio
{
if ( ! partition .strict )
{
//FIXME: this doesn't work to well, when dealing with layouts which contain an extended partition
//because of the metadata length % cylindersize isn't always 0
Sector diff = partition .sector_start % device .cylsize ;
Sector diff = 0;
if ( partition.type == TYPE_LOGICAL ||
partition.sector_start == device .sectors
) {
//Must account the relative offset between:
// (A) the Extended Boot Record sector and the next track of the
// logical partition (usually 63 sectors), and
// (B) the Master Boot Record sector and the next track of the first
// primary partition
diff = (partition .sector_start - device .sectors) % device .cylsize ;
} else if ( partition.sector_start == 34 ) {
// (C) the GUID Partition Table (GPT) and the start of the data
// partition at sector 34
diff = (partition .sector_start - 34 ) % device .cylsize ;
} else {
diff = partition .sector_start % device .cylsize ;
}
if ( diff )
{
if ( diff < ( device .cylsize / 2 ) )