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[NTFS] - Add support for directory creation. Add some helper functions, some comments, and some fixes.

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+AddIndexRoot() - Creates an $INDEX_ROOT attribute and adds it to a file record.
AddNewMftEntry() - Make sure the buffer used by RtlInitializeBitmap() is ULONG-aligned, and a ULONG-multiple in size, per MSDN.
AllocateIndexNode() - Calculate BytesNeeded correctly. Read $BITMAP attribute before increasing its length, in anticipation of a future commit that will check for a free bit before assigning a new index record to the end of the allocation. Use appropriate Set*AttributeDataLength() function, as $BITMAP can be resident or non-resident.
B_TREE_FILENAME_NODE - Give two members more accurate names: change "ExistsOnDisk" member to "HasValidVCN" and rename "NodeNumber" member "VCN."
+CreateEmptyBTree() - Creates a B-Tree to represent an empty directory (for AddIndexRoot).
+NtfsCreateEmptyFileRecord() - Creates an empty file record in memory, with no attributes.
CreateIndexRootFromBTree() - Fix TotalSizeOfEntries calculation.
+NtfsCreateDirectory() - Creates a file record for an empty directory and adds it to the mft.

svn path=/branches/GSoC_2016/NTFS/; revision=75692
This commit is contained in:
Trevor Thompson 2017-08-27 14:37:17 +00:00 • committed by Thomas Faber
parent c63e7e54b5
commit b033f00f58
5 changed files with 542 additions and 113 deletions
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112
drivers/filesystems/ntfs/attrib.c
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@ -167,7 +167,11 @@ AddFileName(PFILE_RECORD_HEADER FileRecord,
FileNameAttribute->LastWriteTime = SystemTime.QuadPart;
FileNameAttribute->LastAccessTime = SystemTime.QuadPart;
FileNameAttribute->FileAttributes = NTFS_FILE_TYPE_ARCHIVE;
// Is this a directory?
if(FileRecord->Flags & FRH_DIRECTORY)
FileNameAttribute->FileAttributes = NTFS_FILE_TYPE_DIRECTORY;
else
FileNameAttribute->FileAttributes = NTFS_FILE_TYPE_ARCHIVE;
// we need to extract the filename from the path
DPRINT1("Pathname: %wZ\n", &FileObject->FileName);
@ -254,6 +258,112 @@ AddFileName(PFILE_RECORD_HEADER FileRecord,
return Status;
}
/**
* @name AddIndexRoot
* @implemented
*
* Adds an $INDEX_ROOT attribute to a given FileRecord.
*
* @param Vcb
* Pointer to an NTFS_VCB for the destination volume.
*
* @param FileRecord
* Pointer to a complete file record to add the attribute to. Caller is responsible for
* ensuring FileRecord is large enough to contain $INDEX_ROOT.
*
* @param AttributeAddress
* Pointer to the region of memory that will receive the $INDEX_ROOT attribute.
* This address must reside within FileRecord. Must be aligned to an 8-byte boundary (relative to FileRecord).
*
* @param NewIndexRoot
* Pointer to an INDEX_ROOT_ATTRIBUTE containing the index root that will be copied to the new attribute.
*
* @param RootLength
* The length of NewIndexRoot, in bytes.
*
* @param Name
* Pointer to a string of 16-bit Unicode characters naming the attribute. Most often, this will be L"$I30".
*
* @param NameLength
* The number of wide-characters in the name. L"$I30" Would use 4 here.
*
* @return
* STATUS_SUCCESS on success. STATUS_NOT_IMPLEMENTED if target address isn't at the end
* of the given file record.
*
* @remarks
* This function is intended to assist in creating new folders.
* Only adding the attribute to the end of the file record is supported; AttributeAddress must
* be of type AttributeEnd.
* It's the caller's responsibility to ensure the given file record has enough memory allocated
* for the attribute, and this memory must have been zeroed.
*/
NTSTATUS
AddIndexRoot(PNTFS_VCB Vcb,
PFILE_RECORD_HEADER FileRecord,
PNTFS_ATTR_RECORD AttributeAddress,
PINDEX_ROOT_ATTRIBUTE NewIndexRoot,
ULONG RootLength,
PCWSTR Name,
USHORT NameLength)
{
ULONG AttributeLength;
// Calculate the header length
ULONG ResidentHeaderLength = FIELD_OFFSET(NTFS_ATTR_RECORD, Resident.Reserved) + sizeof(UCHAR);
// Back up the file record's final ULONG (even though it doesn't matter)
ULONG FileRecordEnd = AttributeAddress->Length;
ULONG NameOffset;
ULONG ValueOffset;
ULONG BytesAvailable;
if (AttributeAddress->Type != AttributeEnd)
{
DPRINT1("FIXME: Can only add $DATA attribute to the end of a file record.\n");
return STATUS_NOT_IMPLEMENTED;
}
NameOffset = ResidentHeaderLength;
// Calculate ValueOffset, which will be aligned to a 4-byte boundary
ValueOffset = ALIGN_UP_BY(NameOffset + (sizeof(WCHAR) * NameLength), VALUE_OFFSET_ALIGNMENT);
// Calculate length of attribute
AttributeLength = ValueOffset + RootLength;
AttributeLength = ALIGN_UP_BY(AttributeLength, ATTR_RECORD_ALIGNMENT);
// Make sure the file record is large enough for the new attribute
BytesAvailable = Vcb->NtfsInfo.BytesPerFileRecord - FileRecord->BytesInUse;
if (BytesAvailable < AttributeLength)
{
DPRINT1("FIXME: Not enough room in file record for index allocation attribute!\n");
return STATUS_NOT_IMPLEMENTED;
}
// Set Attribute fields
RtlZeroMemory(AttributeAddress, AttributeLength);
AttributeAddress->Type = AttributeIndexRoot;
AttributeAddress->Length = AttributeLength;
AttributeAddress->NameLength = NameLength;
AttributeAddress->NameOffset = NameOffset;
AttributeAddress->Instance = FileRecord->NextAttributeNumber++;
AttributeAddress->Resident.ValueLength = RootLength;
AttributeAddress->Resident.ValueOffset = ValueOffset;
// Set the name
RtlCopyMemory((PCHAR)((ULONG_PTR)AttributeAddress + NameOffset), Name, NameLength * sizeof(WCHAR));
// Copy the index root attribute
RtlCopyMemory((PCHAR)((ULONG_PTR)AttributeAddress + ValueOffset), NewIndexRoot, RootLength);
// move the attribute-end and file-record-end markers to the end of the file record
AttributeAddress = (PNTFS_ATTR_RECORD)((ULONG_PTR)AttributeAddress + AttributeAddress->Length);
SetFileRecordEnd(FileRecord, AttributeAddress, FileRecordEnd);
return STATUS_SUCCESS;
}
/**
* @name AddRun
* @implemented