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[NTFS]

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Implement AddRun(). Add support functions and documentation.
+ConvertDataRunsToLargeMCB()
+ConvertLargeMCBToDataRuns()
*SetAttributeDataLength(), *NtfsWriteFile() - Update for AddRun() implementation. Add hack to SetAttributeDataLength() to allow notepad.exe to save files until freeing clusters is implemented.

svn path=/branches/GSoC_2016/NTFS/; revision=71942
This commit is contained in:
Trevor Thompson 2016-07-14 15:20:48 +00:00 • committed by Thomas Faber
parent a135ef5864
commit afe40eb054
4 changed files with 352 additions and 13 deletions
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35
drivers/filesystems/ntfs/mft.c
View file

@ -211,6 +211,11 @@ InternalSetResidentAttributeLength(PNTFS_ATTR_CONTEXT AttrContext,
FileRecord->BytesInUse = NextAttributeOffset + (sizeof(ULONG) * 2);
}
/**
* @parameter FileRecord
* Pointer to a file record. Must be a full record at least
* Fcb->Vcb->NtfsInfo.BytesPerFileRecord bytes large, not just the header.
*/
NTSTATUS
SetAttributeDataLength(PFILE_OBJECT FileObject,
PNTFS_FCB Fcb,
@ -235,6 +240,7 @@ SetAttributeDataLength(PFILE_OBJECT FileObject,
{
ULONG BytesPerCluster = Fcb->Vcb->NtfsInfo.BytesPerCluster;
ULONGLONG AllocationSize = ROUND_UP(DataSize->QuadPart, BytesPerCluster);
PNTFS_ATTR_RECORD DestinationAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + AttrOffset);
// do we need to increase the allocation size?
if (AttrContext->Record.NonResident.AllocatedSize < AllocationSize)
@ -265,7 +271,7 @@ SetAttributeDataLength(PFILE_OBJECT FileObject,
}
// now we need to add the clusters we allocated to the data run
Status = AddRun(AttrContext, NextAssignedCluster, AssignedClusters);
Status = AddRun(Fcb->Vcb, AttrContext, AttrOffset, FileRecord, NextAssignedCluster, AssignedClusters);
if (!NT_SUCCESS(Status))
{
DPRINT1("Error: Unable to add data run!\n");
@ -275,23 +281,34 @@ SetAttributeDataLength(PFILE_OBJECT FileObject,
ClustersNeeded -= AssignedClusters;
LastClusterInDataRun.LowPart = NextAssignedCluster + AssignedClusters - 1;
}
DPRINT1("FixMe: Increasing allocation size is unimplemented!\n");
return STATUS_NOT_IMPLEMENTED;
}
else if (AttrContext->Record.NonResident.AllocatedSize > AllocationSize)
{
// shrink allocation size (TODO)
if (AllocationSize == 0)
{
// hack for notepad.exe
PUCHAR DataRuns = (PUCHAR)((ULONG_PTR)DestinationAttribute + DestinationAttribute->NonResident.MappingPairsOffset);
*DataRuns = 0;
DestinationAttribute->NonResident.HighestVCN =
AttrContext->Record.NonResident.HighestVCN = 0;
}
}
// TODO: is the file compressed, encrypted, or sparse?
// NOTE: we need to have acquired the main resource exclusively, as well as(?) the PagingIoResource
// TODO: update the allocated size on-disk
DPRINT("Allocated Size: %I64u\n", AttrContext->Record.NonResident.AllocatedSize);
Fcb->RFCB.AllocationSize.QuadPart = AllocationSize;
AttrContext->Record.NonResident.AllocatedSize = AllocationSize;
AttrContext->Record.NonResident.DataSize = DataSize->QuadPart;
AttrContext->Record.NonResident.InitializedSize = DataSize->QuadPart;
// copy the attribute record back into the FileRecord
RtlCopyMemory((PCHAR)FileRecord + AttrOffset, &AttrContext->Record, AttrContext->Record.Length);
DestinationAttribute->NonResident.AllocatedSize = AllocationSize;
DestinationAttribute->NonResident.DataSize = DataSize->QuadPart;
DestinationAttribute->NonResident.InitializedSize = DataSize->QuadPart;
DPRINT("Allocated Size: %I64u\n", DestinationAttribute->NonResident.AllocatedSize);
}
else
{