* Sync up to trunk head (r65353).
[reactos.git] / drivers / storage / classpnp / clntirp.c
1 /*++
2
3 Copyright (C) Microsoft Corporation, 1991 - 1999
4
5 Module Name:
6
7 clntirp.c
8
9 Abstract:
10
11 Client IRP queuing routines for CLASSPNP
12
13 Environment:
14
15 kernel mode only
16
17 Notes:
18
19
20 Revision History:
21
22 --*/
23
24 #include "classp.h"
25
26 /*
27 * EnqueueDeferredClientIrp
28 *
29 * Note: we currently do not support Cancel for storage irps.
30 */
31 VOID NTAPI EnqueueDeferredClientIrp(PCLASS_PRIVATE_FDO_DATA FdoData, PIRP Irp)
32 {
33 KIRQL oldIrql;
34
35 KeAcquireSpinLock(&FdoData->SpinLock, &oldIrql);
36 InsertTailList(&FdoData->DeferredClientIrpList, &Irp->Tail.Overlay.ListEntry);
37 KeReleaseSpinLock(&FdoData->SpinLock, oldIrql);
38 }
39
40
41 /*
42 * DequeueDeferredClientIrp
43 *
44 */
45 PIRP NTAPI DequeueDeferredClientIrp(PCLASS_PRIVATE_FDO_DATA FdoData)
46 {
47 KIRQL oldIrql;
48 PLIST_ENTRY listEntry;
49 PIRP irp;
50
51 KeAcquireSpinLock(&FdoData->SpinLock, &oldIrql);
52 if (IsListEmpty(&FdoData->DeferredClientIrpList)){
53 listEntry = NULL;
54 }
55 else {
56 listEntry = RemoveHeadList(&FdoData->DeferredClientIrpList);
57 }
58 KeReleaseSpinLock(&FdoData->SpinLock, oldIrql);
59
60 if (listEntry == NULL) {
61 irp = NULL;
62 } else {
63 irp = CONTAINING_RECORD(listEntry, IRP, Tail.Overlay.ListEntry);
64 ASSERT(irp->Type == IO_TYPE_IRP);
65 InitializeListHead(&irp->Tail.Overlay.ListEntry);
66 }
67
68 return irp;
69 }