int VDIoBackendMemDestroy(PVDIOBACKENDMEM pIoBackend)
{
ASMAtomicXchgBool(&pIoBackend->fRunning, false);
vdIoBackendMemThreadPoke(pIoBackend);
RTThreadWait(pIoBackend->hThreadIo, RT_INDEFINITE_WAIT, NULL);
RTSemEventDestroy(pIoBackend->EventSem);
RTCircBufDestroy(pIoBackend->pRequestRing);
RTMemFree(pIoBackend);
return VINF_SUCCESS;
}
int VDIoBackendMemTransfer(PVDIOBACKENDMEM pIoBackend, PVDMEMDISK pMemDisk,
VDIOTXDIR enmTxDir, uint64_t off, size_t cbTransfer,
PRTSGBUF pSgBuf, PFNVDIOCOMPLETE pfnComplete, void *pvUser)
{
PVDIOBACKENDREQ pReq = NULL;
PPVDIOBACKENDREQ ppReq = NULL;
size_t cbData;
unsigned cSegs = 0;
LogFlowFunc(("Queuing request\n"));
if (enmTxDir != VDIOTXDIR_FLUSH)
RTSgBufSegArrayCreate(pSgBuf, NULL, &cSegs, cbTransfer);
pReq = (PVDIOBACKENDREQ)RTMemAlloc(RT_OFFSETOF(VDIOBACKENDREQ, aSegs[cSegs]));
if (!pReq)
return VERR_NO_MEMORY;
RTCircBufAcquireWriteBlock(pIoBackend->pRequestRing, sizeof(PVDIOBACKENDREQ), (void **)&ppReq, &cbData);
if (!pReq)
{
RTMemFree(pReq);
return VERR_NO_MEMORY;
}
Assert(cbData == sizeof(PVDIOBACKENDREQ));
pReq->enmTxDir = enmTxDir;
pReq->cbTransfer = cbTransfer;
pReq->off = off;
pReq->pMemDisk = pMemDisk;
pReq->pfnComplete = pfnComplete;
pReq->pvUser = pvUser;
if (enmTxDir != VDIOTXDIR_FLUSH)
{
RTSgBufSegArrayCreate(pSgBuf, &pReq->aSegs[0], &cSegs, cbTransfer);
RTSgBufInit(&pReq->SgBuf, pReq->aSegs, cSegs);
}
*ppReq = pReq;
RTCircBufReleaseWriteBlock(pIoBackend->pRequestRing, sizeof(PVDIOBACKENDREQ));
uint32_t cReqsWaiting = ASMAtomicIncU32(&pIoBackend->cReqsWaiting);
if (cReqsWaiting == 1)
vdIoBackendMemThreadPoke(pIoBackend);
return VINF_SUCCESS;
}
int VDIoBackendMemTransfer(PVDIOBACKENDMEM pIoBackend, PVDMEMDISK pMemDisk,
VDIOTXDIR enmTxDir, uint64_t off, size_t cbTransfer, PCRTSGSEG paSegs,
unsigned cSegs, PFNVDIOCOMPLETE pfnComplete, void *pvUser)
{
PVDIOBACKENDREQ pReq = NULL;
PPVDIOBACKENDREQ ppReq = NULL;
size_t cbData;
LogFlowFunc(("Queuing request\n"));
pReq = (PVDIOBACKENDREQ)RTMemAlloc(RT_OFFSETOF(VDIOBACKENDREQ, aSegs[cSegs]));
if (!pReq)
return VERR_NO_MEMORY;
RTCircBufAcquireWriteBlock(pIoBackend->pRequestRing, sizeof(PVDIOBACKENDREQ), (void **)&ppReq, &cbData);
if (!pReq)
{
RTMemFree(pReq);
return VERR_NO_MEMORY;
}
Assert(cbData == sizeof(PVDIOBACKENDREQ));
pReq->enmTxDir = enmTxDir;
pReq->cbTransfer = cbTransfer;
pReq->off = off;
pReq->pMemDisk = pMemDisk;
pReq->cSegs = cSegs;
pReq->pfnComplete = pfnComplete;
pReq->pvUser = pvUser;
for (unsigned i = 0; i < cSegs; i++)
{
pReq->aSegs[i].pvSeg = paSegs[i].pvSeg;
pReq->aSegs[i].cbSeg = paSegs[i].cbSeg;
}
*ppReq = pReq;
RTCircBufReleaseWriteBlock(pIoBackend->pRequestRing, sizeof(PVDIOBACKENDREQ));
uint32_t cReqsWaiting = ASMAtomicIncU32(&pIoBackend->cReqsWaiting);
if (cReqsWaiting == 1)
vdIoBackendMemThreadPoke(pIoBackend);
return VINF_SUCCESS;
}