static NTSTATUS vbsfReadInternal(IN PRX_CONTEXT RxContext)
{
NTSTATUS Status = STATUS_SUCCESS;
RxCaptureFcb;
RxCaptureFobx;
PMRX_VBOX_DEVICE_EXTENSION pDeviceExtension = VBoxMRxGetDeviceExtension(RxContext);
PMRX_VBOX_NETROOT_EXTENSION pNetRootExtension = VBoxMRxGetNetRootExtension(capFcb->pNetRoot);
PMRX_VBOX_FOBX pVBoxFobx = VBoxMRxGetFileObjectExtension(capFobx);
PLOWIO_CONTEXT LowIoContext = &RxContext->LowIoContext;
PMDL BufferMdl = LowIoContext->ParamsFor.ReadWrite.Buffer;
uint32_t ByteCount = LowIoContext->ParamsFor.ReadWrite.ByteCount;
RXVBO ByteOffset = LowIoContext->ParamsFor.ReadWrite.ByteOffset;
PVOID pbUserBuffer = RxLowIoGetBufferAddress(RxContext);
int vboxRC;
BOOLEAN AsyncIo = BooleanFlagOn(RxContext->Flags, RX_CONTEXT_FLAG_ASYNC_OPERATION);
LONGLONG FileSize;
RxGetFileSizeWithLock((PFCB)capFcb, &FileSize);
Log(("VBOXSF: vbsfReadInternal: AsyncIo = %d, Fcb->FileSize = 0x%RX64\n",
AsyncIo, capFcb->Header.FileSize.QuadPart));
Log(("VBOXSF: vbsfReadInternal: UserBuffer %p, BufferMdl %p\n",
pbUserBuffer, BufferMdl));
Log(("VBOXSF: vbsfReadInternal: ByteCount 0x%X, ByteOffset 0x%RX64, FileSize 0x%RX64\n",
ByteCount, ByteOffset, FileSize));
/* @todo check if this is necessary. */
#ifdef FCB_STATE_READCACHING_ENABLED /* Correct spelling for Vista 6001 SDK. */
if (!FlagOn(capFcb->FcbState, FCB_STATE_READCACHING_ENABLED))
#else
if (!FlagOn(capFcb->FcbState, FCB_STATE_READCACHEING_ENABLED))
#endif
{
if (ByteOffset >= FileSize)
{
Log(("VBOXSF: vbsfReadInternal: EOF\n"));
return STATUS_END_OF_FILE;
}
if (ByteCount > FileSize - ByteOffset)
{
ByteCount = (ULONG)(FileSize - ByteOffset);
}
}
/* @todo read 0 bytes == always success? */
if ( BufferMdl == NULL
|| ByteCount == 0)
{
AssertFailed();
return STATUS_INVALID_PARAMETER;
}
/* @todo Split large reads. */
vboxRC = vboxCallRead(&pDeviceExtension->hgcmClient, &pNetRootExtension->map, pVBoxFobx->hFile,
ByteOffset, &ByteCount, (uint8_t *)pbUserBuffer, true /* locked */);
Status = VBoxErrorToNTStatus(vboxRC);
if (Status != STATUS_SUCCESS)
{
/* Nothing read. */
ByteCount = 0;
}
RxContext->InformationToReturn = ByteCount;
Log(("VBOXSF: vbsfReadInternal: Status = 0x%08X, ByteCount = 0x%X\n",
Status, ByteCount));
return Status;
}
static NTSTATUS vbsfWriteInternal(IN PRX_CONTEXT RxContext)
{
NTSTATUS Status = STATUS_SUCCESS;
VBSFTRANSFERCTX ctx;
RxCaptureFcb;
RxCaptureFobx;
PMRX_VBOX_DEVICE_EXTENSION pDeviceExtension = VBoxMRxGetDeviceExtension(RxContext);
PMRX_VBOX_NETROOT_EXTENSION pNetRootExtension = VBoxMRxGetNetRootExtension(capFcb->pNetRoot);
PMRX_VBOX_FOBX pVBoxFobx = VBoxMRxGetFileObjectExtension(capFobx);
PLOWIO_CONTEXT LowIoContext = &RxContext->LowIoContext;
PMDL BufferMdl = LowIoContext->ParamsFor.ReadWrite.Buffer;
uint32_t ByteCount = LowIoContext->ParamsFor.ReadWrite.ByteCount;
RXVBO ByteOffset = LowIoContext->ParamsFor.ReadWrite.ByteOffset;
PVOID pbUserBuffer = RxLowIoGetBufferAddress(RxContext);
int vboxRC;
BOOLEAN AsyncIo = BooleanFlagOn(RxContext->Flags, RX_CONTEXT_FLAG_ASYNC_OPERATION);
LONGLONG FileSize;
RxGetFileSizeWithLock((PFCB)capFcb, &FileSize);
Log(("VBOXSF: vbsfWriteInternal: AsyncIo = %d, Fcb->FileSize = 0x%RX64\n",
AsyncIo, capFcb->Header.FileSize.QuadPart));
Log(("VBOXSF: vbsfWriteInternal: UserBuffer %p, BufferMdl %p\n",
pbUserBuffer, BufferMdl));
Log(("VBOXSF: vbsfWriteInternal: ByteCount is 0x%X, ByteOffset is 0x%RX64, FileSize 0x%RX64\n",
ByteCount, ByteOffset, FileSize));
/* @todo allow to write 0 bytes. */
if ( !BufferMdl
|| ByteCount == 0)
{
AssertFailed();
return STATUS_INVALID_PARAMETER;
}
ctx.pClient = &pDeviceExtension->hgcmClient;
ctx.pMap = &pNetRootExtension->map;
ctx.hFile = pVBoxFobx->hFile;
ctx.offset = (uint64_t)ByteOffset;
ctx.cbData = ByteCount;
ctx.pMdl = BufferMdl;
ctx.pBuffer = (uint8_t *)pbUserBuffer;
ctx.fLocked = true;
ctx.pfnTransferBuffer = vbsfTransferBufferWrite;
ctx.pfnTransferPages = vbsfTransferPagesWrite;
vboxRC = vbsfTransferCommon(&ctx);
ByteCount = ctx.cbData;
Status = VBoxErrorToNTStatus(vboxRC);
if (Status != STATUS_SUCCESS)
{
/* Nothing written. */
ByteCount = 0;
}
RxContext->InformationToReturn = ByteCount;
Log(("VBOXSF: vbsfWriteInternal: Status = 0x%08X, ByteCount = 0x%X\n",
Status, ByteCount));
return Status;
}