ReactOS 0.4.15-dev-7887-g64a59a1
fxrequestbufferkm.hpp
Go to the documentation of this file.
1/*++
2
3 Copyright (c) Microsoft Corporation
4
5 Module Name:
6
7 FxRequestBufferKm.hpp
8
9 Abstract:
10
11 This module implements km specific functions for FxRequestBuffer.
12
13 Author:
14
15
16
17 Environment:
18
19 Kernel mode only
20
21 Revision History:
22
23 --*/
24
25#ifndef _FXREQUESTBUFFERKM_HPP_
26#define _FXREQUESTBUFFERKM_HPP_
27
28__inline
29VOID
33 )
34{
36 u.Mdl.Mdl = Mdl;
37 u.Mdl.Length = Length;
38}
39
43 __in PFX_DRIVER_GLOBALS FxDriverGlobals,
45 __in BOOLEAN * ReuseMdl,
48 __inout size_t* SizeOfMdl,
49 __in BOOLEAN UnlockWhenFreed,
50 __deref_out_opt PMDL* MdlToFree
51 )
52{
53 size_t sizeofCurrentMdl;
54 sizeofCurrentMdl = MmSizeOfMdl(Buffer, Length);
55
56 //
57 // Caller of this function (GetOrAllocateMdl) verifies that pages
58 // are already unlocked. Asserting here, in case we start using this
59 // function elsewhere.
60 //
61 // This is why we don't unlock pages either in reuse or non-reuse case.
62 //
63 ASSERT(UnlockWhenFreed == FALSE);
64 UNREFERENCED_PARAMETER(UnlockWhenFreed); //for fre build
65
66 //
67 // If ReuseMdl is TRUE then the Mdl to be reused is passed in.
68 //
69 if (*ReuseMdl && sizeofCurrentMdl <= *SizeOfMdl) {
70 MmPrepareMdlForReuse(*MdlToFree);
71 *Mdl = *MdlToFree;
72 }
73 else {
74 *ReuseMdl = FALSE;
75
76 //
77 // Since *Mdl may have the original IRP Mdl
78 // free *MdlToFree and not *Mdl
79 //
80 if (*MdlToFree != NULL) {
81 FxMdlFree(FxDriverGlobals, *MdlToFree);
82 *MdlToFree = NULL;
83 if (SizeOfMdl != NULL) {
84 *SizeOfMdl = 0;
85 }
86 }
87
88 *Mdl = FxMdlAllocate(FxDriverGlobals,
89 NULL, // owning FxObject
90 Buffer,
91 Length,
92 FALSE,
93 FALSE);
94
95 if (*Mdl == NULL) {
96
97 ASSERT(SizeOfMdl ? (*SizeOfMdl == 0) : TRUE);
98
100 }
101
102 if (SizeOfMdl != NULL) {
103 *SizeOfMdl = sizeofCurrentMdl;
104 }
105 }
106
107 return STATUS_SUCCESS;
108}
109
110
111#endif // _FXREQUESTBUFFERKM_HPP_
static ULONG SizeOfMdl(VOID)
Definition: NtReadFile.c:36
unsigned char BOOLEAN
LONG NTSTATUS
Definition: precomp.h:26
Definition: bufpool.h:45
#define __in
Definition: dbghelp.h:35
#define __deref_out
Definition: dbghelp.h:26
#define __inout
Definition: dbghelp.h:50
#define __deref_out_opt
Definition: dbghelp.h:29
#define NULL
Definition: types.h:112
#define TRUE
Definition: types.h:120
#define FALSE
Definition: types.h:117
VOID __inline FxMdlFree(__in PFX_DRIVER_GLOBALS FxDriverGlobals, __in PMDL Mdl)
Definition: fxmdl.h:60
PMDL FORCEINLINE FxMdlAllocate(__in PFX_DRIVER_GLOBALS FxDriverGlobals, __in FxObject *Owner, __in PVOID VirtualAddress, __in ULONG Length, __in BOOLEAN SecondaryBuffer, __in BOOLEAN ChargeQuota)
Definition: fxmdl.h:31
@ FxRequestBufferMdl
SIZE_T NTAPI MmSizeOfMdl(IN PVOID Base, IN SIZE_T Length)
Definition: mdlsup.c:409
#define ASSERT(a)
Definition: mode.c:44
#define UNREFERENCED_PARAMETER(P)
Definition: ntbasedef.h:317
_In_ ULONG _In_ ULONG _In_ ULONG Length
Definition: ntddpcm.h:102
long LONG
Definition: pedump.c:60
#define STATUS_SUCCESS
Definition: shellext.h:65
DataType
Definition: simd.h:252
union FxRequestBuffer::@4814 u
NTSTATUS GetOrAllocateMdlWorker(__in PFX_DRIVER_GLOBALS FxDriverGlobals, __deref_out PMDL *Mdl, __in BOOLEAN *ReuseMdl, __in LONG Length, __in PVOID Buffer, __inout size_t *SizeOfMdl, __in BOOLEAN UnlockWhenFreed, __deref_out_opt PMDL *MdlToFree)
VOID SetMdl(__in PMDL Mdl, __in ULONG Length)
uint32_t ULONG
Definition: typedefs.h:59
#define STATUS_INSUFFICIENT_RESOURCES
Definition: udferr_usr.h:158
_In_ WDFDEVICE _In_ PVOID _In_opt_ PMDL Mdl
#define FORCEINLINE
Definition: wdftypes.h:67
#define MmPrepareMdlForReuse(_Mdl)