140 lines
2.7 KiB
C
140 lines
2.7 KiB
C
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/*++
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Copyright (C) Microsoft Corporation, 2000
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Module Name:
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utils.c
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Abstract:
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Utility routines for iScsi Port driver
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Environment:
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kernel mode only
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Revision History:
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--*/
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#include "port.h"
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PVOID
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iSpAllocatePool(
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IN POOL_TYPE PoolType,
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IN SIZE_T NumberOfBytes,
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IN ULONG Tag
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)
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{
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PVOID Block;
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Block = ExAllocatePoolWithTag(PoolType,
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NumberOfBytes,
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Tag);
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if (Block != NULL) {
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RtlZeroMemory(Block, NumberOfBytes);
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}
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return Block;
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}
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NTSTATUS
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iSpAllocateMdlAndIrp(
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IN PVOID Buffer,
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IN ULONG BufferLen,
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IN CCHAR StackSize,
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IN BOOLEAN NonPagedPool,
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OUT PIRP *Irp,
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OUT PMDL *Mdl
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)
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{
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PMDL localMdl = NULL;
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PIRP localIrp = NULL;
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NTSTATUS status;
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//
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// Allocate an MDL for this request
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//
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localMdl = IoAllocateMdl(Buffer,
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BufferLen,
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FALSE,
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FALSE,
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NULL);
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if (localMdl == NULL) {
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DebugPrint((0, "iSpAllocateMdlAndIrp : Failed to allocate MDL\n"));
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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//
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// Initialize the MDL. If the buffer is from NonPaged pool
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// use MmBuildMdlForNonPagedPool. Else, use MmProbeAndLockPages
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//
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if (NonPagedPool == TRUE) {
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MmBuildMdlForNonPagedPool(localMdl);
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} else {
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try {
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MmProbeAndLockPages(localMdl, KernelMode, IoModifyAccess);
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} except(EXCEPTION_EXECUTE_HANDLER) {
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DebugPrint((0,
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"iSpAllocateMdlAndIrp : Failed to Lockpaged\n"));
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IoFreeMdl(localMdl);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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}
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//
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// Allocate an IRP
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//
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localIrp = IoAllocateIrp(StackSize, FALSE);
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if (localIrp == NULL) {
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DebugPrint((0, "iSpAllocateMdlAndIrp. Failed to allocate IRP\n"));
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IoFreeMdl(localMdl);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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DebugPrint((3, "Allocated IRP 0x%08x and MDL 0x%08x\n",
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localIrp, localMdl));
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*Irp = localIrp;
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*Mdl = localMdl;
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return STATUS_SUCCESS;
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}
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VOID
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iSpFreeMdlAndIrp(
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IN PMDL Mdl,
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IN PIRP Irp,
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BOOLEAN UnlockPages
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)
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{
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PMDL tmpMdlPtr = NULL;
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if (Irp == NULL) {
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return;
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}
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//
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// Free any MDLs allocated for this IRP
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//
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if (Mdl != NULL) {
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while ((Irp->MdlAddress) != NULL) {
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tmpMdlPtr = (Irp->MdlAddress)->Next;
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if (UnlockPages) {
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MmUnlockPages(Irp->MdlAddress);
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}
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IoFreeMdl(Irp->MdlAddress);
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Irp->MdlAddress = tmpMdlPtr;
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}
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}
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IoFreeIrp(Irp);
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}
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