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/*++
Copyright (c) Microsoft Corporation. All Rights Reserved
Module Name:
context.h
Abstract:
Header file which contains context-related data
structures, type definitions, constants,
global variables and function prototypes.
Environment:
Kernel mode
--*/
#ifndef __CONTEXT_H__
#define __CONTEXT_H__
#define CG_FILE_CONTEXT_TAG 'cFcG'
#define CG_TRANSACTION_CONTEXT_TAG 'cTcG'
//
// Defines the transaction context structure
//
typedef struct _CG_TRANSACTION_CONTEXT {
//
// Transaction object pointer
//
PKTRANSACTION Transaction;
//
// A flag that tracks if it has ben enlisted in transaction
//
BOOLEAN Enlisted;
//
// A flag that indicates if the fc list is drained
//
BOOLEAN ListDrained;
//
// List head for file context list.
// The list is grown only when transacted writers are part of the
// transaction, i.e. this list contains all file contexts likely
// to be modified in a transaction.
//
LIST_ENTRY ScListHead;
//
// Lock used to protect the list.
//
PFAST_MUTEX Mutex;
} CG_TRANSACTION_CONTEXT, *PCG_TRANSACTION_CONTEXT;
#define CG_TRANSACTION_CONTEXT_SIZE sizeof( CG_TRANSACTION_CONTEXT )
//
// This is to deal with ReFS' 128-bit file IDs & NTFS' 64-bit FileIDs.
//
typedef union _CG_FILE_REFERENCE {
//
// For 64-bit fileIDs the upper 64-bits are always zeroes.
//
struct {
ULONGLONG Value;
ULONGLONG UpperZeroes;
} FileId64;
FILE_ID_128 FileId128;
} CG_FILE_REFERENCE, *PCG_FILE_REFERENCE;
//
// File context data structure
//
typedef struct _CG_FILE_CONTEXT {
//
// File ID, obtained from querying the file system for
// FileInternalInformation or FileIdInformation.
//
CG_FILE_REFERENCE FileID;
//
// The flag that we use to record if the file is dirty
// if we have seen it before.
//
BOOLEAN Dirty;
//
// TxDirty is to record if the file is dirty in a
// transaction
//
BOOLEAN TxDirty;
//
// A pointer to the transaction context, so we can jump to list in the transaction.
//
PCG_TRANSACTION_CONTEXT TxContext;
//
// This list entry is exactly the embedded entry to
// form a doubly linked list inside transaction context.
//
LIST_ENTRY ListInTransaction;
} CG_FILE_CONTEXT, *PCG_FILE_CONTEXT;
#define CG_FILE_CONTEXT_SIZE sizeof( CG_FILE_CONTEXT )
NTSTATUS
CgFindOrCreateFileContext (
_In_ PFLT_CALLBACK_DATA Cbd,
_Outptr_ PCG_FILE_CONTEXT *FileContext
);
NTSTATUS
CgFindOrCreateTransactionContext(
_In_ PCFLT_RELATED_OBJECTS FltObjects,
_Outptr_ PCG_TRANSACTION_CONTEXT *TransactionContext
);
#endif
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