ReactOS 0.4.15-dev-5896-g3f5bcf5
irp cancel boilerplate.c
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1
2
3/*
4Boiler plate for irp cancelation, for irp queues you manage yourself
5-Gunnar
6*/
7
8
9
11 DEV_OBJ Dev,
12 Irp
13 )
14{
15 //don't need this since we have our own sync. protecting irp cancellation
16 IoReleaseCancelSpinLock(Irp->CancelIrql);
17
18 theLock = Irp->Tail.Overlay.DriverContext[3];
19
20 Lock(theLock);
21 RemoveEntryList(&Irp->Tail.Overlay.ListEntry);
22 Unlock(theLock);
23
24 Irp->IoStatus.Status = STATUS_CANCELLED;
25 Irp->IoStatus.Information = 0;
26
28
29}
30
31
33{
34 Lock(theLock);
35
36 Irp->Tail.Overlay.DriverContext[3] = &theLock;
37
39 if (Irp->Cancel && IoSetCancelRoutine(Irp, NULL))
40 {
41 /*
42 Irp has already been cancelled (before we got to queue it),
43 and we got to remove the cancel routine before the canceler could,
44 so we cancel/complete the irp ourself.
45 */
46
47 Unlock(theLock);
48
49 Irp->IoStatus.Status = STATUS_CANCELLED;
50 Irp->IoStatus.Information = 0;
52
53 return FALSE;
54 }
55
56 //else were ok
57
58
59 Irp->IoStatus.Status = STATUS_PENDING;
61
63
64 Unlock(theLock);
65
66}
67
68
70{
71 Lock(theLock);
72
74
76 {
77 /*
78 Cancel routine WILL be called after we release the spinlock. It will try to remove
79 the irp from the list and cancel/complete this irp. Since we allready removed it,
80 make its ListEntry point to itself.
81 */
82
83 InitializeListHead(&Irp->Tail.Overlay.ListEntry);
84
85 Unlock(theLock);
86
87 return;
88 }
89
90
91 /*
92 Cancel routine will NOT be called, canceled or not.
93 The Irp might have been canceled (Irp->Cancel flag set) but we don't care,
94 since we are to complete this Irp now anyways.
95 */
96
97 Unlock(theLock);
98
99 Irp->IoStatus.Status = STATUS_SUCCESS;
100 Irp->IoStatus.Information = 0;
102
103}
_In_ PIRP Irp
Definition: csq.h:116
#define NULL
Definition: types.h:112
#define FALSE
Definition: types.h:117
#define RemoveEntryList(Entry)
Definition: env_spec_w32.h:986
#define InsertTailList(ListHead, Entry)
#define RemoveHeadList(ListHead)
Definition: env_spec_w32.h:964
#define InitializeListHead(ListHead)
Definition: env_spec_w32.h:944
IoMarkIrpPending(Irp)
IoSetCancelRoutine(Irp, CancelRoutine)
DEQUEUE_BOILERPLATE
#define IoCompleteRequest
Definition: irp.c:1240
VOID NTAPI IoReleaseCancelSpinLock(IN KIRQL Irql)
Definition: util.c:150
@ Unlock
Definition: ntsecapi.h:294
#define STATUS_PENDING
Definition: ntstatus.h:82
#define STATUS_SUCCESS
Definition: shellext.h:65
#define STATUS_CANCELLED
Definition: udferr_usr.h:170
_Must_inspect_result_ _In_ WDFDEVICE _In_ PIRP _In_ WDFQUEUE Queue
Definition: wdfdevice.h:2225
_Must_inspect_result_ _In_opt_ PWDF_OBJECT_ATTRIBUTES _Out_ WDFWAITLOCK * Lock
Definition: wdfsync.h:127
_In_opt_ PDRIVER_CANCEL CancelRoutine
Definition: iofuncs.h:2744
#define IO_NO_INCREMENT
Definition: iotypes.h:598