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[NTFS] Add support for creating new MFT entries:

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+AddStandardInformation(), +AddData(), +AddFileName() - Add attributes to a file record
+NtfsCreateFileRecord() - Creates a new file record and saves it to the MFT.
+AddNewMftEntry() - Adds a file record to the MFT.
NtfsCreateFile() - Modified to create a file record on a file-creation request (file creation is still unsupported; the created file needs to be added to the parent's directory index).
+SetFileRecordEnd() - Establishes a new file record size
UpdateFileRecord() - Improved documentation
InternalSetResidentAttributeLength() - Updated to use SetFileRecordEnd().

svn path=/branches/GSoC_2016/NTFS/; revision=74321
This commit is contained in:
Trevor Thompson 2017-04-16 00:17:07 +00:00 • committed by Thomas Faber
parent 7643831d56
commit 0409b3161e
4 changed files with 545 additions and 20 deletions
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96
drivers/filesystems/ntfs/create.c
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@ -545,8 +545,15 @@ NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
RequestedDisposition == FILE_OPEN_IF ||
RequestedDisposition == FILE_OVERWRITE_IF ||
RequestedDisposition == FILE_SUPERSEDE)
{
DPRINT1("Denying file creation request on NTFS volume\n");
{
// Create the file record on disk
Status = NtfsCreateFileRecord(DeviceExt, FileObject);
// Update the parent directory index
// Still TODO
// Call NtfsOpenFile()
return STATUS_CANNOT_MAKE;
}
}
@ -599,4 +606,89 @@ NtfsCreate(PNTFS_IRP_CONTEXT IrpContext)
return Status;
}
/**
* @name NtfsCreateFileRecord()
* @implemented
*
* Creates a file record and saves it to the MFT.
*
* @param DeviceExt
* Points to the target disk's DEVICE_EXTENSION
*
* @param FileObject
* Pointer to a FILE_OBJECT describing the file to be created
*
* @return
* STATUS_SUCCESS on success.
* STATUS_INSUFFICIENT_RESOURCES if unable to allocate memory for the file record.
*/
NTSTATUS
NtfsCreateFileRecord(PDEVICE_EXTENSION DeviceExt,
PFILE_OBJECT FileObject)
{
NTSTATUS Status = STATUS_SUCCESS;
PFILE_RECORD_HEADER FileRecord;
PNTFS_ATTR_RECORD NextAttribute;
// allocate memory for file record
FileRecord = ExAllocatePoolWithTag(NonPagedPool,
DeviceExt->NtfsInfo.BytesPerFileRecord,
TAG_NTFS);
if (!FileRecord)
{
DPRINT1("ERROR: Unable to allocate memory for file record!\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlZeroMemory(FileRecord, DeviceExt->NtfsInfo.BytesPerFileRecord);
FileRecord->Ntfs.Type = NRH_FILE_TYPE;
// calculate USA offset and count
FileRecord->Ntfs.UsaOffset = FIELD_OFFSET(FILE_RECORD_HEADER, MFTRecordNumber) + sizeof(ULONG);
// size of USA (in ULONG's) will be 1 (for USA number) + 1 for every sector the file record uses
FileRecord->BytesAllocated = DeviceExt->NtfsInfo.BytesPerFileRecord;
FileRecord->Ntfs.UsaCount = (FileRecord->BytesAllocated / DeviceExt->NtfsInfo.BytesPerSector) + 1;
// setup other file record fields
FileRecord->SequenceNumber = 1;
FileRecord->AttributeOffset = FileRecord->Ntfs.UsaOffset + (2 * FileRecord->Ntfs.UsaCount);
FileRecord->AttributeOffset = ALIGN_UP_BY(FileRecord->AttributeOffset, 8);
FileRecord->Flags = FRH_IN_USE;
FileRecord->BytesInUse = FileRecord->AttributeOffset + sizeof(ULONG) * 2;
// find where the first attribute will be added
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + FileRecord->AttributeOffset);
// mark the (temporary) end of the file-record
NextAttribute->Type = AttributeEnd;
NextAttribute->Length = FILE_RECORD_END;
// add first attribute, $STANDARD_INFORMATION
AddStandardInformation(FileRecord, NextAttribute);
// advance NextAttribute pointer to the next attribute
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)NextAttribute + (ULONG_PTR)NextAttribute->Length);
// Add the $FILE_NAME attribute
AddFileName(FileRecord, NextAttribute, DeviceExt, FileObject);
// advance NextAttribute pointer to the next attribute
NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)NextAttribute + (ULONG_PTR)NextAttribute->Length);
// add the $DATA attribute
AddData(FileRecord, NextAttribute);
// dump file record in memory (for debugging)
NtfsDumpFileRecord(DeviceExt, FileRecord);
// Now that we've built the file record in memory, we need to store it in the MFT.
Status = AddNewMftEntry(FileRecord, DeviceExt);
ExFreePoolWithTag(FileRecord, TAG_NTFS);
return Status;
}
/* EOF */