TDiskPartition

Return to Unit Filesystem

Description

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To be documented

Class definitions

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TDiskPartition = class(TListObject)

constructor Create(ADriver:TFileSysDriver; ADevice:TDiskDevice; APartition:TDiskPartition; APartitionNo:Integer);
destructor Destroy; override;
private
FLock:TSynchronizerHandle;
FLocalLock:TMutexHandle;
protected
FDriver:TFileSysDriver;
FDevice:TDiskDevice;
FPartition:TDiskPartition;
FPartitionNo:Integer;	\Partition1, \Partition2 etc - See Notes
FEntryNo:Integer;	0,1,2,3
FPartitionId:Byte;	Partition Type from Table
FBeginHead:Word;	Logical Starting Head (not Physical)
FBeginSector:Word;	Logical Starting Sector (not Physical)
FBeginCylinder:Word;	Logical Starting Cylinder (not Physical)
FEndHead:Word;	Logical Ending Head (not Physical)
FEndSector:Word;	Logical Ending Sector (not Physical)
FEndCylinder:Word;	Logical Ending Cylinder (not Physical)
FSectorOffset:LongWord;	Offset in Sectors from Location of Table to StartSector
FActive:Boolean;	Active Partition Indicator ($80)
FExtended:Boolean;	Extended Partition Type (no Volume) - Set by Recognizer
FRecognizable:Boolean;	Partition allows Recognize Partition
FRecognized:Boolean;	Recognized Partition Id - Set by Recognizer
FNonVolume:Boolean;	Non Volume Partition (eg Linux Swap) - Set by Recognizer
FMultiVolume:Boolean;	Multiple Volume Partition (eg Netware) - Set by Recognizer
FStartSector:Int64;	Absolute Start Sector on Device
FSectorCount:LongWord;	Total Sectors in Partition
function AcquireLock:Boolean;
function ReleaseLock:Boolean;
function GetName:String;
function GetPath:String;
function GetParent:String;
function GetLogical:Boolean;
function GetPrimary:Boolean;
procedure SetExtended(AExtended:Boolean);
function GetFreeSectors:LongWord;	Unused Sectors in Partition
function GetAvailableSectors:LongWord;	Largest block of Unused Sectors
function GetAvailableBlock(var AStart,ACount:LongWord):Boolean;
function GetRoot:TDiskPartition;
function GetParentStart:LongWord;
function GetPartitionRecord(ARecord:Pointer,ASector:LongWord):Boolean; virtual;
function SetPartitionRecord(ARecord:Pointer,ASector:LongWord):Boolean; virtual;
public
property Name:String read GetName;
property Path:String read GetPath;
property Parent:String read GetParent;
property Device:TDiskDevice read FDevice;
property Partition:TDiskPartition read FPartition;
property PartitionNo:Integer read FPartitionNo;
property EntryNo:Integer read FEntryNo write FEntryNo;
property PartitionId:Byte read FPartitionId;
property BeginHead:Word read FBeginHead;
property BeginSector:Word read FBeginSector;
property BeginCylinder:Word read FBeginCylinder;
property EndHead:Word read FEndHead;
property EndSector:Word read FEndSector;
property EndCylinder:Word read FEndCylinder;
property SectorOffset:LongWord read FSectorOffset;
property Active:Boolean read FActive;
property Logical:Boolean read GetLogical;
property Primary:Boolean read GetPrimary;
property Extended:Boolean read FExtended write SetExtended;
property Recognizable:Boolean read FRecognizable;
property Recognized:Boolean read FRecognized write FRecognized;
property NonVolume:Boolean read FNonVolume write FNonVolume;
property MultiVolume:Boolean read FMultiVolume write FMultiVolume;
property StartSector:Int64 read FStartSector;
property SectorCount:LongWord read FSectorCount;
property FreeSectors:LongWord read GetFreeSectors;
property AvailableSectors:LongWord read GetAvailableSectors;
property Root:TDiskPartition read GetRoot;
property ParentStart:LongWord read GetParentStart;
function ReaderLock:Boolean;
function ReaderUnlock:Boolean;
function ReaderConvert:Boolean;
function WriterLock:Boolean;
function WriterUnlock:Boolean;
function WriterConvert:Boolean;
function PartitionInit:Boolean; virtual;
function LocatePartitions:Boolean; virtual;
function LocateVolumes:Boolean; virtual;
function CreateVolume:TDiskVolume; virtual;
function DeleteVolume(AVolume:TDiskVolume):Boolean; virtual;
function OpenPartition(AMode:Integer):THandle; virtual;
procedure ClosePartition(AHandle:THandle); virtual;
function ReadPartition(AHandle:THandle; var ABuffer; ACount:Integer):Integer; virtual;
function WritePartition(AHandle:THandle; const ABuffer; ACount:Integer):Integer; virtual;
function SeekPartition(AHandle:THandle; const AOffset:Int64; AOrigin:Integer):Int64; virtual;

Function declarations

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constructor TDiskPartition.Create(ADriver:TFileSysDriver; ADevice:TDiskDevice; APartition:TDiskPartition; APartitionNo:Integer);

Description: To be documented

Note	None documented

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destructor TDiskPartition.Destroy;

Description: To be documented

Note	None documented

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function TDiskPartition.AcquireLock:Boolean;

Description: To be documented

Note	None documented

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function TDiskPartition.ReleaseLock:Boolean;

Description: To be documented

Note	None documented

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function TDiskPartition.GetName:String;

Description: To be documented

Note	None documented

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function TDiskPartition.GetPath:String;

Description: To be documented

Note	None documented

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function TDiskPartition.GetParent:String;

Description: To be documented

Note	None documented

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function TDiskPartition.GetLogical:Boolean;

Description: Check for a non extended partition with a parent

Note	None documented

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function TDiskPartition.GetPrimary:Boolean;

Description: Check for a non extended partition with no parent

Note	None documented

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procedure TDiskPartition.SetExtended(AExtended:Boolean);

Description: Mark partition as extended, update no and recalculate start

Note	Once extended is enabled it cannot be turned off If already enabled then no action is taken

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function TDiskPartition.GetFreeSectors:LongWord;

Description: Get the total Count of Unused Sectors in the Partition

Note	None documented

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function TDiskPartition.GetAvailableSectors:LongWord;

Description: Get the largest Count of Unused Sectors in the Partition

Note	None documented

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function TDiskPartition.GetAvailableBlock(var AStart,ACount:LongWord):Boolean;

Description: Get the Start and Count of largest Unused Sectors in the Partition

Note	None documented

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function TDiskPartition.GetRoot:TDiskPartition;

Description: Returns the first level extended for a second level plus partition

Note	None documented

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function TDiskPartition.GetParentStart:LongWord;

Description: To be documented

Note	None documented

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function TDiskPartition.ReaderLock:Boolean;

Description: To be documented

Note	None documented

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function TDiskPartition.ReaderUnlock:Boolean;

Description: To be documented

Note	None documented

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function TDiskPartition.ReaderConvert:Boolean;

Description: Convert a Reader lock to a Writer lock

Note	None documented

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function TDiskPartition.WriterLock:Boolean;

Description: To be documented

Note	None documented

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function TDiskPartition.WriterUnlock:Boolean;

Description: To be documented

Note	None documented

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function TDiskPartition.WriterConvert:Boolean;

Description: Convert a Writer lock to a Reader lock

Note	None documented

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function TDiskPartition.PartitionInit:Boolean;

Description: To be documented

Note	None documented

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function TDiskPartition.LocatePartitions:Boolean;

Description: To be documented

Note	None documented

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function TDiskPartition.LocateVolumes:Boolean;

Description: To be documented

Note	None documented

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function TDiskPartition.CreateVolume:TDiskVolume;

Description: To be documented

Note	None documented

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function TDiskPartition.DeleteVolume(AVolume:TDiskVolume):Boolean;

Description: To be documented

Note	Caller must hold the volume writer lock

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function TDiskPartition.OpenPartition(AMode:Integer):THandle; virtual;

Description: To be documented

Note	None documented

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procedure TDiskPartition.ClosePartition(AHandle:THandle); virtual;

Description: To be documented

Note	None documented

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function TDiskPartition.ReadPartition(AHandle:THandle; var ABuffer; ACount:Integer):Integer; virtual;

Description: To be documented

Note	Raw Reads must be in Sector sized multiples

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function TDiskPartition.WritePartition(AHandle:THandle; const ABuffer; ACount:Integer):Integer; virtual;

Description: To be documented

Note	Raw Writes must be in Sector sized multiples

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function TDiskPartition.SeekPartition(AHandle:THandle; const AOffset:Int64; AOrigin:Integer):Int64; virtual;

Description: To be documented

Note	Raw Seeks must be in Sector sized multiples Raw Seeks cannot extend the size of the Partition

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