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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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48
drivers/filesystems/ntfs/mft.c
View file

@ -151,7 +151,7 @@ FindAttribute(PDEVICE_EXTENSION Vcb,
}
ULONG
ULONGLONG
AttributeAllocatedLength(PNTFS_ATTR_RECORD AttrRecord)
{
if (AttrRecord->IsNonResident)
@ -181,9 +181,49 @@ SetAttributeDataLength(PFILE_OBJECT FileObject,
{
if (AttrContext->Record.IsNonResident)
{
ULONG BytesPerCluster = Fcb->Vcb->NtfsInfo.BytesPerCluster;
ULONGLONG AllocationSize = ROUND_UP(DataSize->QuadPart, BytesPerCluster);
// do we need to increase the allocation size?
if (AttrContext->Record.NonResident.AllocatedSize < DataSize->QuadPart)
{
if (AttrContext->Record.NonResident.AllocatedSize < AllocationSize)
{
ULONG ExistingClusters = AttrContext->Record.NonResident.AllocatedSize / BytesPerCluster;
ULONG ClustersNeeded = (AllocationSize / BytesPerCluster) - ExistingClusters;
LARGE_INTEGER LastClusterInDataRun;
ULONG NextAssignedCluster;
ULONG AssignedClusters;
NTSTATUS Status = GetLastClusterInDataRun(Fcb->Vcb, &AttrContext->Record, &LastClusterInDataRun.QuadPart);
DPRINT1("GetLastClusterInDataRun returned: %I64u\n", LastClusterInDataRun.QuadPart);
DPRINT1("Highest VCN of record: %I64u\n", AttrContext->Record.NonResident.HighestVCN);
while (ClustersNeeded > 0)
{
Status = NtfsAllocateClusters(Fcb->Vcb,
LastClusterInDataRun.LowPart + 1,
ClustersNeeded,
&NextAssignedCluster,
&AssignedClusters);
if (!NT_SUCCESS(Status))
{
DPRINT1("Error: Unable to allocate requested clusters!\n");
return Status;
}
// now we need to add the clusters we allocated to the data run
Status = AddRun(AttrContext, NextAssignedCluster, AssignedClusters);
if (!NT_SUCCESS(Status))
{
DPRINT1("Error: Unable to add data run!\n");
return Status;
}
ClustersNeeded -= AssignedClusters;
LastClusterInDataRun.LowPart = NextAssignedCluster + AssignedClusters - 1;
}
DPRINT1("FixMe: Increasing allocation size is unimplemented!\n");
return STATUS_NOT_IMPLEMENTED;
}
@ -459,7 +499,7 @@ WriteAttribute(PDEVICE_EXTENSION Vcb,
PUCHAR SourceBuffer = Buffer;
LONGLONG StartingOffset;
DPRINT("WriteAttribute(%p, %p, %I64U, %p, %lu)\n", Vcb, Context, Offset, Buffer, Length);
DPRINT("WriteAttribute(%p, %p, %I64u, %p, %lu, %p)\n", Vcb, Context, Offset, Buffer, Length, RealLengthWritten);
// is this a resident attribute?
if (!Context->Record.IsNonResident)