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[NTFS]

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Lay some groundwork for extending allocation size.
+AddRun() - Unimplemented
+GetLastClusterInDataRun()
+NtfsAllocateClusters()

svn path=/branches/GSoC_2016/NTFS/; revision=71696
This commit is contained in:
Trevor Thompson 2016-06-29 16:35:36 +00:00 • committed by Thomas Faber
parent 84a1280fd6
commit 77fc65dc0e
4 changed files with 223 additions and 5 deletions
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57
drivers/filesystems/ntfs/attrib.c
View file

@ -35,6 +35,19 @@
/* FUNCTIONS ****************************************************************/
NTSTATUS
AddRun(PNTFS_ATTR_CONTEXT AttrContext,
ULONGLONG NextAssignedCluster,
ULONG RunLength)
{
UNIMPLEMENTED;
if (!AttrContext->Record.IsNonResident)
return STATUS_INVALID_PARAMETER;
return STATUS_NOT_IMPLEMENTED;
}
PUCHAR
DecodeRun(PUCHAR DataRun,
LONGLONG *DataRunOffset,
@ -551,6 +564,50 @@ GetFileNameFromRecord(PDEVICE_EXTENSION Vcb,
return NULL;
}
NTSTATUS
GetLastClusterInDataRun(PDEVICE_EXTENSION Vcb, PNTFS_ATTR_RECORD Attribute, PULONGLONG LastCluster)
{
LONGLONG DataRunOffset;
ULONGLONG DataRunLength;
LONGLONG DataRunStartLCN;
ULONGLONG LastLCN = 0;
PUCHAR DataRun = (PUCHAR)Attribute + Attribute->NonResident.MappingPairsOffset;
if (!Attribute->IsNonResident)
return STATUS_INVALID_PARAMETER;
while (1)
{
DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
if (DataRunOffset == -1)
{
// sparse run
if (*DataRun == 0)
{
// if it's the last run, return the last cluster of the last run
*LastCluster = LastLCN + DataRunLength - 1;
break;
}
}
else
{
// Normal data run.
DataRunStartLCN = LastLCN + DataRunOffset;
LastLCN = DataRunStartLCN;
}
if (*DataRun == 0)
{
*LastCluster = LastLCN + DataRunLength - 1;
break;
}
}
return STATUS_SUCCESS;
}
PSTANDARD_INFORMATION
GetStandardInformationFromRecord(PDEVICE_EXTENSION Vcb,
PFILE_RECORD_HEADER FileRecord)