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dll: FspFileSystemLoop()

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This commit is contained in:
Bill Zissimopoulos
2015-12-30 17:31:24 -08:00
parent db28be473f
commit 422d4ccc79
4 changed files with 45 additions and 62 deletions
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173
src0/dll/loop.c
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@@ -1,173 +0,0 @@
/**
* @file dll/loop.c
*
* @copyright 2015 Bill Zissimopoulos
*/
#include <dll/library.h>
typedef struct _FSP_WORK_ITEM
{
FSP_FILE_SYSTEM *FileSystem;
__declspec(align(MEMORY_ALLOCATION_ALIGNMENT)) UINT8 RequestBuf[];
} FSP_WORK_ITEM;
FSP_API NTSTATUS FspFileSystemCreate(PWSTR DevicePath,
const FSP_FSCTL_VOLUME_PARAMS *Params, FSP_FILE_SYSTEM_PROCESSREQ *ProcessRequest,
FSP_FILE_SYSTEM **PFileSystem)
{
NTSTATUS Result;
WCHAR VolumePathBuf[MAX_PATH];
HANDLE VolumeHandle = INVALID_HANDLE_VALUE;
FSP_FILE_SYSTEM *FileSystem = 0;
*PFileSystem = 0;
if (0 == ProcessRequest)
ProcessRequest = FspProcessRequestDirect;
FileSystem = MemAlloc(sizeof *FileSystem);
if (0 == FileSystem)
{
Result = STATUS_INSUFFICIENT_RESOURCES;
goto exit;
}
Result = FspFsctlCreateVolume(DevicePath, Params, 0, VolumePathBuf, sizeof VolumePathBuf);
if (!NT_SUCCESS(Result))
goto exit;
Result = FspFsctlOpenVolume(VolumePathBuf, &VolumeHandle);
if (!NT_SUCCESS(Result))
goto exit;
memset(FileSystem, 0, sizeof *FileSystem);
FileSystem->VolumeHandle = VolumeHandle;
FileSystem->ProcessRequest = ProcessRequest;
*PFileSystem = FileSystem;
Result = STATUS_SUCCESS;
exit:
if (!NT_SUCCESS(Result))
{
if (INVALID_HANDLE_VALUE != VolumeHandle)
CloseHandle(VolumeHandle);
MemFree(FileSystem);
}
return Result;
}
FSP_API VOID FspFileSystemDelete(FSP_FILE_SYSTEM *FileSystem)
{
if (INVALID_HANDLE_VALUE != FileSystem->VolumeHandle)
CloseHandle(FileSystem->VolumeHandle);
MemFree(FileSystem);
}
FSP_API NTSTATUS FspFileSystemLoop(FSP_FILE_SYSTEM *FileSystem)
{
NTSTATUS Result;
PUINT8 RequestBuf, RequestBufEnd;
SIZE_T RequestBufSize;
FSP_FSCTL_TRANSACT_REQ *Request, *NextRequest;
RequestBuf = MemAlloc(FSP_FSCTL_TRANSACT_REQ_BUFFER_SIZEMIN);
if (0 == RequestBuf)
return STATUS_INSUFFICIENT_RESOURCES;
for (;;)
{
RequestBufSize = FSP_FSCTL_TRANSACT_REQ_BUFFER_SIZEMIN;
Result = FspFsctlTransact(FileSystem->VolumeHandle, 0, 0, RequestBuf, &RequestBufSize);
if (!NT_SUCCESS(Result))
goto exit;
RequestBufEnd = RequestBuf + RequestBufSize;
Request = (PVOID)RequestBuf;
for (;;)
{
NextRequest = FspFsctlTransactConsumeRequest(Request, RequestBufEnd);
if (0 == NextRequest)
break;
Result = FileSystem->ProcessRequest(FileSystem, Request);
if (!NT_SUCCESS(Result))
goto exit;
Request = NextRequest;
}
}
exit:
MemFree(RequestBuf);
return Result;
}
FSP_API NTSTATUS FspProcessRequestDirect(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request)
{
if (FspFsctlTransactKindCount <= Request->Kind || 0 == FileSystem->Operations[Request->Kind])
return FspProduceResponseWithStatus(FileSystem, Request, STATUS_INVALID_DEVICE_REQUEST);
FileSystem->Operations[Request->Kind](FileSystem, Request);
return STATUS_SUCCESS;
}
static DWORD WINAPI FspProcessRequestInPoolWorker(PVOID Param)
{
FSP_WORK_ITEM *WorkItem = Param;
FSP_FSCTL_TRANSACT_REQ *Request = (PVOID)WorkItem->RequestBuf;
WorkItem->FileSystem->Operations[Request->Kind](WorkItem->FileSystem, Request);
MemFree(WorkItem);
return 0;
}
FSP_API NTSTATUS FspProcessRequestInPool(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request)
{
if (FspFsctlTransactKindCount <= Request->Kind || 0 == FileSystem->Operations[Request->Kind])
return FspProduceResponseWithStatus(FileSystem, Request, STATUS_INVALID_DEVICE_REQUEST);
FSP_WORK_ITEM *WorkItem;
BOOLEAN Success;
WorkItem = MemAlloc(sizeof *WorkItem + Request->Size);
if (0 == WorkItem)
return STATUS_INSUFFICIENT_RESOURCES;
WorkItem->FileSystem = FileSystem;
memcpy(WorkItem->RequestBuf, Request, Request->Size);
Success = QueueUserWorkItem(FspProcessRequestInPoolWorker, WorkItem, WT_EXECUTEDEFAULT);
if (!Success)
{
NTSTATUS Result0 = FspNtStatusFromWin32(GetLastError());
MemFree(WorkItem);
return Result0;
}
return STATUS_SUCCESS;
}
FSP_API NTSTATUS FspProduceResponse(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_RSP *Response)
{
return FspFsctlTransact(FileSystem->VolumeHandle, Response, Response->Size, 0, 0);
}
FSP_API NTSTATUS FspProduceResponseWithStatus(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request, NTSTATUS Result)
{
FSP_FSCTL_TRANSACT_RSP Response;
memset(&Response, 0, sizeof Response);
Response.Size = sizeof Response;
Response.Kind = Request->Kind;
Response.Hint = Request->Hint;
Response.IoStatus.Status = Result;
return FspProduceResponse(FileSystem, &Response);
}