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Annotation of truecrypt/driver/encryptedioqueue.h, revision 1.1.1.6

1.1       root        1: /*
1.1.1.6 ! root        2:  Copyright (c) 2008-2009 TrueCrypt Foundation. All rights reserved.
1.1       root        3: 
1.1.1.5   root        4:  Governed by the TrueCrypt License 2.6 the full text of which is contained
1.1       root        5:  in the file License.txt included in TrueCrypt binary and source code
                      6:  distribution packages.
                      7: */
                      8: 
                      9: #ifndef TC_HEADER_DRIVER_ENCRYPTED_IO_QUEUE
                     10: #define TC_HEADER_DRIVER_ENCRYPTED_IO_QUEUE
                     11: 
                     12: #include "TCdefs.h"
                     13: #include "Apidrvr.h"
                     14: 
1.1.1.6 ! root       15: #if 0
        !            16: #      define TC_TRACE_IO_QUEUE
        !            17: #endif
        !            18: 
1.1.1.5   root       19: #define TC_ENC_IO_QUEUE_MAX_FRAGMENT_SIZE (256 * 1024)
1.1.1.6 ! root       20: 
        !            21: #define TC_ENC_IO_QUEUE_PREALLOCATED_ITEM_COUNT 16
        !            22: #define TC_ENC_IO_QUEUE_PREALLOCATED_IO_REQUEST_COUNT 256
        !            23: 
        !            24: #define TC_ENC_IO_QUEUE_MEM_ALLOC_RETRY_DELAY 1
        !            25: #define TC_ENC_IO_QUEUE_MEM_ALLOC_TIMEOUT (20 * 1000)
        !            26: 
        !            27: 
        !            28: typedef struct EncryptedIoQueueBufferStruct
        !            29: {
        !            30:        struct EncryptedIoQueueBufferStruct *NextBuffer;
        !            31: 
        !            32:        void *Address;
        !            33:        ULONG Size;
        !            34:        BOOL InUse;
        !            35: 
        !            36: } EncryptedIoQueueBuffer;
        !            37: 
1.1       root       38: 
                     39: typedef struct
                     40: {
                     41:        PDEVICE_OBJECT DeviceObject;
                     42:        
1.1.1.6 ! root       43:        KMUTEX BufferPoolMutex;
        !            44:        EncryptedIoQueueBuffer *FirstPoolBuffer;
        !            45: 
1.1       root       46:        CRYPTO_INFO *CryptoInfo;
                     47:        
                     48:        // File-handle-based IO
                     49:        HANDLE HostFileHandle;
                     50:        int64 VirtualDeviceLength;
1.1.1.5   root       51:        SECURITY_CLIENT_CONTEXT *SecurityClientContext;
1.1       root       52: 
                     53:        // Filter device
                     54:        BOOL IsFilterDevice;
                     55:        PDEVICE_OBJECT LowerDeviceObject;
                     56:        int64 EncryptedAreaStart;
                     57:        int64 EncryptedAreaEnd;
1.1.1.4   root       58:        BOOL RemapEncryptedArea;
                     59:        int64 RemappedAreaOffset;
                     60:        int64 RemappedAreaDataUnitOffset;
1.1       root       61:        IO_REMOVE_LOCK RemoveLock;
                     62: 
                     63:        // Main tread
                     64:        PKTHREAD MainThread;
                     65:        LIST_ENTRY MainThreadQueue;
                     66:        KSPIN_LOCK MainThreadQueueLock;
                     67:        KEVENT MainThreadQueueNotEmptyEvent;
                     68: 
                     69:        // IO thread
                     70:        PKTHREAD IoThread;
                     71:        LIST_ENTRY IoThreadQueue;
                     72:        KSPIN_LOCK IoThreadQueueLock;
                     73:        KEVENT IoThreadQueueNotEmptyEvent;
                     74: 
                     75:        // Completion thread
                     76:        PKTHREAD CompletionThread;
                     77:        LIST_ENTRY CompletionThreadQueue;
                     78:        KSPIN_LOCK CompletionThreadQueueLock;
                     79:        KEVENT CompletionThreadQueueNotEmptyEvent;
                     80: 
1.1.1.6 ! root       81:        // Fragment buffers
1.1       root       82:        byte *FragmentBufferA;
                     83:        byte *FragmentBufferB;
                     84:        KEVENT FragmentBufferAFreeEvent;
                     85:        KEVENT FragmentBufferBFreeEvent;
                     86: 
1.1.1.6 ! root       87:        // Read-ahead buffer
        !            88:        BOOL ReadAheadBufferValid;
        !            89:        LARGE_INTEGER LastReadOffset;
        !            90:        ULONG LastReadLength;
        !            91:        LARGE_INTEGER ReadAheadOffset;
        !            92:        ULONG ReadAheadLength;
        !            93:        byte *ReadAheadBuffer;
        !            94:        LARGE_INTEGER MaxReadAheadOffset;
        !            95: 
1.1       root       96:        LONG OutstandingIoCount;
                     97:        KEVENT NoOutstandingIoEvent;
1.1.1.6 ! root       98:        LONG IoThreadPendingRequestCount;
        !            99: 
1.1.1.3   root      100:        KEVENT RequestCompletedEvent;
                    101: 
1.1       root      102:        __int64 TotalBytesRead;
                    103:        __int64 TotalBytesWritten;
                    104: 
1.1.1.6 ! root      105:        volatile BOOL StartPending;
1.1       root      106:        volatile BOOL ThreadExitRequested;
                    107:        
                    108:        volatile BOOL Suspended;
                    109:        volatile BOOL SuspendPending;
                    110:        volatile BOOL StopPending;
                    111: 
                    112:        KEVENT QueueResumedEvent;
                    113: 
1.1.1.6 ! root      114: #ifdef TC_TRACE_IO_QUEUE
        !           115:        LARGE_INTEGER LastPerformanceCounter;
        !           116: #endif
        !           117: 
1.1       root      118: }  EncryptedIoQueue;
                    119: 
                    120: 
                    121: typedef struct
                    122: {
                    123:        EncryptedIoQueue *Queue;
                    124:        PIRP OriginalIrp;
                    125:        BOOL Write;
                    126:        ULONG OriginalLength;
                    127:        LARGE_INTEGER OriginalOffset;
1.1.1.3   root      128:        LONG OutstandingRequestCount;
1.1       root      129:        NTSTATUS Status;
1.1.1.6 ! root      130: 
        !           131: #ifdef TC_TRACE_IO_QUEUE
        !           132:        LARGE_INTEGER OriginalIrpOffset;
        !           133: #endif
        !           134: 
1.1       root      135: } EncryptedIoQueueItem;
                    136: 
                    137: 
                    138: typedef struct
                    139: {
                    140:        EncryptedIoQueueItem *Item;
                    141: 
                    142:        BOOL CompleteOriginalIrp;
                    143:        LARGE_INTEGER Offset;
                    144:        ULONG Length;
                    145:        int64 EncryptedOffset;
                    146:        ULONG EncryptedLength;
                    147:        byte *Data;
                    148:        byte *OrigDataBufferFragment;
                    149: 
                    150:        LIST_ENTRY ListEntry;
                    151:        LIST_ENTRY CompletionListEntry;
                    152: } EncryptedIoRequest;
                    153: 
                    154: 
                    155: NTSTATUS EncryptedIoQueueAddIrp (EncryptedIoQueue *queue, PIRP irp);
                    156: BOOL EncryptedIoQueueIsRunning (EncryptedIoQueue *queue);
                    157: BOOL EncryptedIoQueueIsSuspended (EncryptedIoQueue *queue);
                    158: NTSTATUS EncryptedIoQueueResumeFromHold (EncryptedIoQueue *queue);
1.1.1.5   root      159: NTSTATUS EncryptedIoQueueStart (EncryptedIoQueue *queue);
1.1       root      160: NTSTATUS EncryptedIoQueueStop (EncryptedIoQueue *queue);
                    161: NTSTATUS EncryptedIoQueueHoldWhenIdle (EncryptedIoQueue *queue, int64 timeout);
                    162: 
                    163: 
                    164: #endif // TC_HEADER_DRIVER_ENCRYPTED_IO_QUEUE

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