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73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/**
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* @file sys/fileobj.c
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*
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* @copyright 2015 Bill Zissimopoulos
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*/
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#include <sys/driver.h>
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NTSTATUS FspFileContextCreate(PDEVICE_OBJECT DeviceObject,
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ULONG ExtraSize, FSP_FILE_CONTEXT **PFsContext);
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VOID FspFileContextDelete(FSP_FILE_CONTEXT *Context);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, FspFileContextCreate)
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#pragma alloc_text(PAGE, FspFileContextDelete)
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#endif
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NTSTATUS FspFileContextCreate(PDEVICE_OBJECT DeviceObject,
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ULONG ExtraSize, FSP_FILE_CONTEXT **PFsContext)
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{
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PAGED_CODE();
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*PFsContext = 0;
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FSP_FILE_CONTEXT_NONPAGED *NonPaged = FspAllocNonPaged(sizeof *NonPaged);
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if (0 == NonPaged)
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return STATUS_INSUFFICIENT_RESOURCES;
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FSP_FILE_CONTEXT *FsContext = FspAlloc(sizeof *FsContext + ExtraSize);
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if (0 == FsContext)
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{
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FspFree(NonPaged);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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RtlZeroMemory(NonPaged, sizeof *NonPaged);
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ExInitializeResourceLite(&NonPaged->Resource);
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ExInitializeResourceLite(&NonPaged->PagingIoResource);
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ExInitializeFastMutex(&NonPaged->HeaderFastMutex);
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RtlZeroMemory(FsContext, sizeof *FsContext + ExtraSize);
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FsContext->Header.NodeTypeCode = FspFileContextFileKind;
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FsContext->Header.NodeByteSize = sizeof *FsContext;
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FsContext->Header.IsFastIoPossible = FastIoIsQuestionable;
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FsContext->Header.Resource = &NonPaged->Resource;
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FsContext->Header.PagingIoResource = &NonPaged->PagingIoResource;
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FsRtlSetupAdvancedHeader(&FsContext->Header, &NonPaged->HeaderFastMutex);
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FsContext->NonPaged = NonPaged;
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FsContext->RefCount = 1;
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FsContext->FsvolDeviceObject = DeviceObject;
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FspDeviceRetain(FsContext->FsvolDeviceObject);
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RtlInitEmptyUnicodeString(&FsContext->FileName, FsContext->FileNameBuf, (USHORT)ExtraSize);
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*PFsContext = FsContext;
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return STATUS_SUCCESS;
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}
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VOID FspFileContextDelete(FSP_FILE_CONTEXT *FsContext)
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{
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PAGED_CODE();
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FsRtlTeardownPerStreamContexts(&FsContext->Header);
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FspDeviceRelease(FsContext->FsvolDeviceObject);
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ExDeleteResourceLite(&FsContext->NonPaged->PagingIoResource);
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ExDeleteResourceLite(&FsContext->NonPaged->Resource);
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FspFree(FsContext->NonPaged);
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FspFree(FsContext);
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}
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