/* $Id: DrvRamDisk.cpp 64728 2016-11-21 11:50:58Z vboxsync $ */ /** @file * VBox storage devices: RAM disk driver. */ /* * Copyright (C) 2016 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_DRV_DISK_INTEGRITY #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "VBoxDD.h" #include "IOBufMgmt.h" /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** Pointer to a ramdisk driver instance. */ typedef struct DRVRAMDISK *PDRVRAMDISK; /** * Disk segment. */ typedef struct DRVDISKSEGMENT { /** AVL core. */ AVLRFOFFNODECORE Core; /** Size of the segment */ size_t cbSeg; /** Data for this segment */ uint8_t *pbSeg; } DRVDISKSEGMENT, *PDRVDISKSEGMENT; /** * VD I/O request state. */ typedef enum VDIOREQSTATE { /** Invalid. */ VDIOREQSTATE_INVALID = 0, /** The request is not in use and resides on the free list. */ VDIOREQSTATE_FREE, /** The request was just allocated and is not active. */ VDIOREQSTATE_ALLOCATED, /** The request was allocated and is in use. */ VDIOREQSTATE_ACTIVE, /** The request was suspended and is not actively processed. */ VDIOREQSTATE_SUSPENDED, /** The request is in the last step of completion and syncs memory. */ VDIOREQSTATE_COMPLETING, /** The request completed. */ VDIOREQSTATE_COMPLETED, /** The request was aborted but wasn't returned as complete from the storage * layer below us. */ VDIOREQSTATE_CANCELED, /** 32bit hack. */ VDIOREQSTATE_32BIT_HACK = 0x7fffffff } VDIOREQSTATE; /** * VD I/O Request. */ typedef struct PDMMEDIAEXIOREQINT { /** List node for the list of allocated requests. */ RTLISTNODE NdAllocatedList; /** List for requests waiting for I/O memory or on the redo list. */ RTLISTNODE NdLstWait; /** I/O request type. */ PDMMEDIAEXIOREQTYPE enmType; /** Request state. */ volatile VDIOREQSTATE enmState; /** I/O request ID. */ PDMMEDIAEXIOREQID uIoReqId; /** Pointer to the disk container. */ PDRVRAMDISK pDisk; /** Flags. */ uint32_t fFlags; /** Timestamp when the request was submitted. */ uint64_t tsSubmit; /** Type dependent data. */ union { /** Read/Write request sepcific data. */ struct { /** Start offset of the request. */ uint64_t offStart; /** Size of the request. */ size_t cbReq; /** Size left for this request. */ size_t cbReqLeft; /** Size of the allocated I/O buffer. */ size_t cbIoBuf; /** I/O buffer descriptor. */ IOBUFDESC IoBuf; } ReadWrite; /** Discard specific data. */ struct { /** Pointer to array of ranges to discard. */ PRTRANGE paRanges; /** Number of ranges to discard. */ unsigned cRanges; } Discard; }; /** Allocator specific memory - variable size. */ uint8_t abAlloc[1]; } PDMMEDIAEXIOREQINT; /** Pointer to a VD I/O request. */ typedef PDMMEDIAEXIOREQINT *PPDMMEDIAEXIOREQINT; /** * Structure for holding a list of allocated requests. */ typedef struct VDLSTIOREQALLOC { /** Mutex protecting the table of allocated requests. */ RTSEMFASTMUTEX hMtxLstIoReqAlloc; /** List anchor. */ RTLISTANCHOR LstIoReqAlloc; } VDLSTIOREQALLOC; typedef VDLSTIOREQALLOC *PVDLSTIOREQALLOC; /** Number of bins for allocated requests. */ #define DRVVD_VDIOREQ_ALLOC_BINS 8 /** * Disk integrity driver instance data. * * @implements PDMIMEDIA */ typedef struct DRVRAMDISK { /** Pointer driver instance. */ PPDMDRVINS pDrvIns; /** Pointer to the media driver below us. * This is NULL if the media is not mounted. */ PPDMIMEDIA pDrvMedia; /** Our media interface */ PDMIMEDIA IMedia; /** The media port interface above. */ PPDMIMEDIAPORT pDrvMediaPort; /** Media port interface */ PDMIMEDIAPORT IMediaPort; /** Flag whether the RAM disk was pre allocated. */ bool fPreallocRamDisk; /** Flag whether to report a non totating medium. */ bool fNonRotational; /** AVL tree containing the disk blocks to check. */ PAVLRFOFFTREE pTreeSegments; /** Size of the disk. */ uint64_t cbDisk; /** Size of one sector. */ uint32_t cbSector; /** Worker request queue. */ RTREQQUEUE hReqQ; /** Worker thread for async requests. */ RTTHREAD hThrdWrk; /** @name IMEDIAEX interface support specific members. * @{ */ /** Pointer to the IMEDIAEXPORT interface above us. */ PPDMIMEDIAEXPORT pDrvMediaExPort; /** Our extended media interface. */ PDMIMEDIAEX IMediaEx; /** Memory cache for the I/O requests. */ RTMEMCACHE hIoReqCache; /** I/O buffer manager. */ IOBUFMGR hIoBufMgr; /** Active request counter. */ volatile uint32_t cIoReqsActive; /** Bins for allocated requests. */ VDLSTIOREQALLOC aIoReqAllocBins[DRVVD_VDIOREQ_ALLOC_BINS]; /** List of requests for I/O memory to be available - VDIOREQ::NdLstWait. */ RTLISTANCHOR LstIoReqIoBufWait; /** Critical section protecting the list of requests waiting for I/O memory. */ RTCRITSECT CritSectIoReqsIoBufWait; /** Number of requests waiting for a I/O buffer. */ volatile uint32_t cIoReqsWaiting; /** Flag whether we have to resubmit requests on resume because the * VM was suspended due to a recoverable I/O error. */ volatile bool fRedo; /** List of requests we have to redo. */ RTLISTANCHOR LstIoReqRedo; /** Criticial section protecting the list of waiting requests. */ RTCRITSECT CritSectIoReqRedo; /** Number of errors logged so far. */ unsigned cErrors; /** @} */ } DRVRAMDISK; static void drvramdiskMediaExIoReqComplete(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, int rcReq); /** * Record a successful write to the virtual disk. * * @returns VBox status code. * @param pThis Disk integrity driver instance data. * @param pSgBuf The S/G buffer holding the data to write. * @param off Start offset. * @param cbWrite Number of bytes to record. */ static int drvramdiskWriteWorker(PDRVRAMDISK pThis, PRTSGBUF pSgBuf, uint64_t off, size_t cbWrite) { int rc = VINF_SUCCESS; LogFlowFunc(("pThis=%#p pSgBuf=%#p cSeg=%u off=%llx cbWrite=%u\n", pThis, pSgBuf, off, cbWrite)); /* Update the segments */ size_t cbLeft = cbWrite; RTFOFF offCurr = (RTFOFF)off; while (cbLeft) { PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetRangeGet(pThis->pTreeSegments, offCurr); size_t cbRange = 0; bool fSet = false; unsigned offSeg = 0; if (!pSeg) { /* Get next segment */ pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetGetBestFit(pThis->pTreeSegments, offCurr, true); if ( !pSeg || offCurr + (RTFOFF)cbLeft <= pSeg->Core.Key) cbRange = cbLeft; else cbRange = pSeg->Core.Key - offCurr; Assert(cbRange % 512 == 0); /* Create new segment */ pSeg = (PDRVDISKSEGMENT)RTMemAllocZ(sizeof(DRVDISKSEGMENT)); if (pSeg) { pSeg->Core.Key = offCurr; pSeg->Core.KeyLast = offCurr + (RTFOFF)cbRange - 1; pSeg->cbSeg = cbRange; pSeg->pbSeg = (uint8_t *)RTMemAllocZ(cbRange); if (!pSeg->pbSeg) RTMemFree(pSeg); else { bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSeg->Core); AssertMsg(fInserted, ("Bug!\n")); RT_NOREF(fInserted); fSet = true; } } } else { fSet = true; offSeg = offCurr - pSeg->Core.Key; cbRange = RT_MIN(cbLeft, (size_t)(pSeg->Core.KeyLast + 1 - offCurr)); } if (fSet) { AssertPtr(pSeg); size_t cbCopied = RTSgBufCopyToBuf(pSgBuf, pSeg->pbSeg + offSeg, cbRange); Assert(cbCopied == cbRange); RT_NOREF(cbCopied); } else RTSgBufAdvance(pSgBuf, cbRange); offCurr += cbRange; cbLeft -= cbRange; } return rc; } /** * Read data from the ram disk. * * @returns VBox status code. * @param pThis RAM disk driver instance data. * @param pSgBuf The S/G buffer to store the data. * @param off Start offset. * @param cbRead Number of bytes to read. */ static int drvramdiskReadWorker(PDRVRAMDISK pThis, PRTSGBUF pSgBuf, uint64_t off, size_t cbRead) { int rc = VINF_SUCCESS; LogFlowFunc(("pThis=%#p pSgBuf=%#p off=%llx cbRead=%u\n", pThis, pSgBuf, off, cbRead)); Assert(off % 512 == 0); Assert(cbRead % 512 == 0); /* Compare read data */ size_t cbLeft = cbRead; RTFOFF offCurr = (RTFOFF)off; while (cbLeft) { PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetRangeGet(pThis->pTreeSegments, offCurr); size_t cbRange = 0; bool fCmp = false; unsigned offSeg = 0; if (!pSeg) { /* Get next segment */ pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetGetBestFit(pThis->pTreeSegments, offCurr, true); if ( !pSeg || offCurr + (RTFOFF)cbLeft <= pSeg->Core.Key) cbRange = cbLeft; else cbRange = pSeg->Core.Key - offCurr; /* No segment means everything should be 0 for this part. */ RTSgBufSet(pSgBuf, 0, cbRange); } else { fCmp = true; offSeg = offCurr - pSeg->Core.Key; cbRange = RT_MIN(cbLeft, (size_t)(pSeg->Core.KeyLast + 1 - offCurr)); RTSGSEG Seg; RTSGBUF SgBufSrc; Seg.cbSeg = cbRange; Seg.pvSeg = pSeg->pbSeg + offSeg; RTSgBufInit(&SgBufSrc, &Seg, 1); RTSgBufCopy(pSgBuf, &SgBufSrc, cbRange); } offCurr += cbRange; cbLeft -= cbRange; } return rc; } /** * Discards the given ranges from the disk. * * @returns VBox status code. * @param pThis Disk integrity driver instance data. * @param paRanges Array of ranges to discard. * @param cRanges Number of ranges in the array. */ static int drvramdiskDiscardRecords(PDRVRAMDISK pThis, PCRTRANGE paRanges, unsigned cRanges) { int rc = VINF_SUCCESS; LogFlowFunc(("pThis=%#p paRanges=%#p cRanges=%u\n", pThis, paRanges, cRanges)); for (unsigned i = 0; i < cRanges; i++) { uint64_t offStart = paRanges[i].offStart; size_t cbLeft = paRanges[i].cbRange; LogFlowFunc(("Discarding off=%llu cbRange=%zu\n", offStart, cbLeft)); while (cbLeft) { size_t cbRange; PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetRangeGet(pThis->pTreeSegments, offStart); if (!pSeg) { /* Get next segment */ pSeg = (PDRVDISKSEGMENT)RTAvlrFileOffsetGetBestFit(pThis->pTreeSegments, offStart, true); if ( !pSeg || (RTFOFF)offStart + (RTFOFF)cbLeft <= pSeg->Core.Key) cbRange = cbLeft; else cbRange = pSeg->Core.Key - offStart; Assert(!(cbRange % 512)); } else { size_t cbPreLeft, cbPostLeft; cbRange = RT_MIN(cbLeft, pSeg->Core.KeyLast - offStart + 1); cbPreLeft = offStart - pSeg->Core.Key; cbPostLeft = pSeg->cbSeg - cbRange - cbPreLeft; Assert(!(cbRange % 512)); Assert(!(cbPreLeft % 512)); Assert(!(cbPostLeft % 512)); LogFlowFunc(("cbRange=%zu cbPreLeft=%zu cbPostLeft=%zu\n", cbRange, cbPreLeft, cbPostLeft)); RTAvlrFileOffsetRemove(pThis->pTreeSegments, pSeg->Core.Key); if (!cbPreLeft && !cbPostLeft) { /* Just free the whole segment. */ LogFlowFunc(("Freeing whole segment pSeg=%#p\n", pSeg)); RTMemFree(pSeg->pbSeg); RTMemFree(pSeg); } else if (cbPreLeft && !cbPostLeft) { /* Realloc to new size and insert. */ LogFlowFunc(("Realloc segment pSeg=%#p\n", pSeg)); pSeg->pbSeg = (uint8_t *)RTMemRealloc(pSeg->pbSeg, cbPreLeft); pSeg = (PDRVDISKSEGMENT)RTMemRealloc(pSeg, sizeof(DRVDISKSEGMENT)); pSeg->Core.KeyLast = pSeg->Core.Key + cbPreLeft - 1; pSeg->cbSeg = cbPreLeft; bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSeg->Core); Assert(fInserted); RT_NOREF(fInserted); } else if (!cbPreLeft && cbPostLeft) { /* Move data to the front and realloc. */ LogFlowFunc(("Move data and realloc segment pSeg=%#p\n", pSeg)); memmove(pSeg->pbSeg, pSeg->pbSeg + cbRange, cbPostLeft); pSeg = (PDRVDISKSEGMENT)RTMemRealloc(pSeg, sizeof(DRVDISKSEGMENT)); pSeg->pbSeg = (uint8_t *)RTMemRealloc(pSeg->pbSeg, cbPostLeft); pSeg->Core.Key += cbRange; pSeg->cbSeg = cbPostLeft; bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSeg->Core); Assert(fInserted); RT_NOREF(fInserted); } else { /* Split the segment into 2 new segments. */ LogFlowFunc(("Split segment pSeg=%#p\n", pSeg)); PDRVDISKSEGMENT pSegPost = (PDRVDISKSEGMENT)RTMemAllocZ(sizeof(DRVDISKSEGMENT)); if (pSegPost) { pSegPost->Core.Key = pSeg->Core.Key + cbPreLeft + cbRange; pSegPost->Core.KeyLast = pSeg->Core.KeyLast; pSegPost->cbSeg = cbPostLeft; pSegPost->pbSeg = (uint8_t *)RTMemAllocZ(cbPostLeft); if (!pSegPost->pbSeg) RTMemFree(pSegPost); else { memcpy(pSegPost->pbSeg, pSeg->pbSeg + cbPreLeft + cbRange, cbPostLeft); bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSegPost->Core); Assert(fInserted); RT_NOREF(fInserted); } } /* Shrink the current segment. */ pSeg->pbSeg = (uint8_t *)RTMemRealloc(pSeg->pbSeg, cbPreLeft); pSeg = (PDRVDISKSEGMENT)RTMemRealloc(pSeg, sizeof(DRVDISKSEGMENT)); pSeg->Core.KeyLast = pSeg->Core.Key + cbPreLeft - 1; pSeg->cbSeg = cbPreLeft; bool fInserted = RTAvlrFileOffsetInsert(pThis->pTreeSegments, &pSeg->Core); Assert(fInserted); RT_NOREF(fInserted); } /* if (cbPreLeft && cbPostLeft) */ } offStart += cbRange; cbLeft -= cbRange; } } LogFlowFunc(("returns rc=%Rrc\n", rc)); return rc; } /* -=-=-=-=- IMedia -=-=-=-=- */ /********************************************************************************************************************************* * Media interface methods * *********************************************************************************************************************************/ /** @copydoc PDMIMEDIA::pfnRead */ static DECLCALLBACK(int) drvramdiskRead(PPDMIMEDIA pInterface, uint64_t off, void *pvBuf, size_t cbRead) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia); RTSGSEG Seg; RTSGBUF SgBuf; Seg.cbSeg = cbRead; Seg.pvSeg = pvBuf; RTSgBufInit(&SgBuf, &Seg, 1); return drvramdiskReadWorker(pThis, &SgBuf, off, cbRead); } /** @copydoc PDMIMEDIA::pfnWrite */ static DECLCALLBACK(int) drvramdiskWrite(PPDMIMEDIA pInterface, uint64_t off, const void *pvBuf, size_t cbWrite) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia); RTSGSEG Seg; RTSGBUF SgBuf; Seg.cbSeg = cbWrite; Seg.pvSeg = (void *)pvBuf; RTSgBufInit(&SgBuf, &Seg, 1); return drvramdiskWriteWorker(pThis, &SgBuf, off, cbWrite); } /** @copydoc PDMIMEDIA::pfnFlush */ static DECLCALLBACK(int) drvramdiskFlush(PPDMIMEDIA pInterface) { RT_NOREF1(pInterface); /* Nothing to do here. */ return VINF_SUCCESS; } /** @copydoc PDMIMEDIA::pfnGetSize */ static DECLCALLBACK(uint64_t) drvramdiskGetSize(PPDMIMEDIA pInterface) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia); return pThis->cbDisk; } /** @interface_method_impl{PDMIMEDIA,pfnBiosIsVisible} */ static DECLCALLBACK(bool) drvramdiskBiosIsVisible(PPDMIMEDIA pInterface) { RT_NOREF1(pInterface); return false; } /** @copydoc PDMIMEDIA::pfnGetType */ static DECLCALLBACK(PDMMEDIATYPE) drvramdiskGetType(PPDMIMEDIA pInterface) { RT_NOREF1(pInterface); return PDMMEDIATYPE_HARD_DISK; } /** @copydoc PDMIMEDIA::pfnIsReadOnly */ static DECLCALLBACK(bool) drvramdiskIsReadOnly(PPDMIMEDIA pInterface) { RT_NOREF1(pInterface); return false; /** @todo */ } /** @copydoc PDMIMEDIA::pfnBiosGetPCHSGeometry */ static DECLCALLBACK(int) drvramdiskBiosGetPCHSGeometry(PPDMIMEDIA pInterface, PPDMMEDIAGEOMETRY pPCHSGeometry) { RT_NOREF2(pInterface, pPCHSGeometry); return VERR_NOT_IMPLEMENTED; } /** @copydoc PDMIMEDIA::pfnBiosSetPCHSGeometry */ static DECLCALLBACK(int) drvramdiskBiosSetPCHSGeometry(PPDMIMEDIA pInterface, PCPDMMEDIAGEOMETRY pPCHSGeometry) { RT_NOREF2(pInterface, pPCHSGeometry); return VERR_NOT_IMPLEMENTED; } /** @copydoc PDMIMEDIA::pfnBiosGetLCHSGeometry */ static DECLCALLBACK(int) drvramdiskBiosGetLCHSGeometry(PPDMIMEDIA pInterface, PPDMMEDIAGEOMETRY pLCHSGeometry) { RT_NOREF2(pInterface, pLCHSGeometry); return VERR_NOT_IMPLEMENTED; } /** @copydoc PDMIMEDIA::pfnBiosSetLCHSGeometry */ static DECLCALLBACK(int) drvramdiskBiosSetLCHSGeometry(PPDMIMEDIA pInterface, PCPDMMEDIAGEOMETRY pLCHSGeometry) { RT_NOREF2(pInterface, pLCHSGeometry); return VERR_NOT_IMPLEMENTED; } /** @copydoc PDMIMEDIA::pfnGetUuid */ static DECLCALLBACK(int) drvramdiskGetUuid(PPDMIMEDIA pInterface, PRTUUID pUuid) { RT_NOREF1(pInterface); return RTUuidClear(pUuid); } /** @copydoc PDMIMEDIA::pfnGetSectorSize */ static DECLCALLBACK(uint32_t) drvramdiskGetSectorSize(PPDMIMEDIA pInterface) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia); return pThis->cbSector; } /** @copydoc PDMIMEDIA::pfnDiscard */ static DECLCALLBACK(int) drvramdiskDiscard(PPDMIMEDIA pInterface, PCRTRANGE paRanges, unsigned cRanges) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia); return drvramdiskDiscardRecords(pThis, paRanges, cRanges); } /** @copydoc PDMIMEDIA::pfnReadPcBios */ static DECLCALLBACK(int) drvramdiskReadPcBios(PPDMIMEDIA pInterface, uint64_t off, void *pvBuf, size_t cbRead) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia); RTSGSEG Seg; RTSGBUF SgBuf; Seg.cbSeg = cbRead; Seg.pvSeg = pvBuf; RTSgBufInit(&SgBuf, &Seg, 1); return drvramdiskReadWorker(pThis, &SgBuf, off, cbRead); } /** @interface_method_impl{PDMIMEDIA,pfnIsNonRotational} */ static DECLCALLBACK(bool) drvramdiskIsNonRotational(PPDMIMEDIA pInterface) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMedia); return pThis->fNonRotational; } /********************************************************************************************************************************* * Extended media interface methods * *********************************************************************************************************************************/ static void drvramdiskMediaExIoReqWarningOutOfMemory(PPDMDRVINS pDrvIns) { int rc; LogRel(("RamDisk#%u: Out of memory\n", pDrvIns->iInstance)); rc = PDMDrvHlpVMSetRuntimeError(pDrvIns, VMSETRTERR_FLAGS_SUSPEND | VMSETRTERR_FLAGS_NO_WAIT, "DrvRamDisk_OOM", N_("There is not enough free memory for the ramdisk")); AssertRC(rc); } /** * Checks whether a given status code indicates a recoverable error * suspending the VM if it is. * * @returns Flag indicating whether the status code is a recoverable error * (full disk, broken network connection). * @param pThis VBox disk container instance data. * @param rc Status code to check. */ bool drvramdiskMediaExIoReqIsRedoSetWarning(PDRVRAMDISK pThis, int rc) { if (rc == VERR_NO_MEMORY) { if (ASMAtomicCmpXchgBool(&pThis->fRedo, true, false)) drvramdiskMediaExIoReqWarningOutOfMemory(pThis->pDrvIns); return true; } return false; } /** * Syncs the memory buffers between the I/O request allocator and the internal buffer. * * @returns VBox status code. * @param pThis VBox disk container instance data. * @param pIoReq I/O request to sync. * @param fToIoBuf Flag indicating the sync direction. * true to copy data from the allocators buffer to our internal buffer. * false for the other direction. */ DECLINLINE(int) drvramdiskMediaExIoReqBufSync(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, bool fToIoBuf) { int rc = VINF_SUCCESS; Assert(pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ || pIoReq->enmType == PDMMEDIAEXIOREQTYPE_WRITE); /* Make sure the buffer is reset. */ RTSgBufReset(&pIoReq->ReadWrite.IoBuf.SgBuf); if (fToIoBuf) rc = pThis->pDrvMediaExPort->pfnIoReqCopyToBuf(pThis->pDrvMediaExPort, pIoReq, &pIoReq->abAlloc[0], pIoReq->ReadWrite.cbReq - pIoReq->ReadWrite.cbReqLeft, &pIoReq->ReadWrite.IoBuf.SgBuf, RT_MIN(pIoReq->ReadWrite.cbIoBuf, pIoReq->ReadWrite.cbReqLeft)); else rc = pThis->pDrvMediaExPort->pfnIoReqCopyFromBuf(pThis->pDrvMediaExPort, pIoReq, &pIoReq->abAlloc[0], pIoReq->ReadWrite.cbReq - pIoReq->ReadWrite.cbReqLeft, &pIoReq->ReadWrite.IoBuf.SgBuf, RT_MIN(pIoReq->ReadWrite.cbIoBuf, pIoReq->ReadWrite.cbReqLeft)); RTSgBufReset(&pIoReq->ReadWrite.IoBuf.SgBuf); return rc; } /** * Hashes the I/O request ID to an index for the allocated I/O request bin. */ DECLINLINE(unsigned) drvramdiskMediaExIoReqIdHash(PDMMEDIAEXIOREQID uIoReqId) { return uIoReqId % DRVVD_VDIOREQ_ALLOC_BINS; /** @todo: Find something better? */ } /** * Inserts the given I/O request in to the list of allocated I/O requests. * * @returns VBox status code. * @param pThis VBox disk container instance data. * @param pIoReq I/O request to insert. */ static int drvramdiskMediaExIoReqInsert(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq) { int rc = VINF_SUCCESS; unsigned idxBin = drvramdiskMediaExIoReqIdHash(pIoReq->uIoReqId); rc = RTSemFastMutexRequest(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc); if (RT_SUCCESS(rc)) { /* Search for conflicting I/O request ID. */ PPDMMEDIAEXIOREQINT pIt; RTListForEach(&pThis->aIoReqAllocBins[idxBin].LstIoReqAlloc, pIt, PDMMEDIAEXIOREQINT, NdAllocatedList) { if (RT_UNLIKELY(pIt->uIoReqId == pIoReq->uIoReqId)) { rc = VERR_PDM_MEDIAEX_IOREQID_CONFLICT; break; } } if (RT_SUCCESS(rc)) RTListAppend(&pThis->aIoReqAllocBins[idxBin].LstIoReqAlloc, &pIoReq->NdAllocatedList); RTSemFastMutexRelease(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc); } return rc; } /** * Removes the given I/O request from the list of allocated I/O requests. * * @returns VBox status code. * @param pThis VBox disk container instance data. * @param pIoReq I/O request to insert. */ static int drvramdiskMediaExIoReqRemove(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq) { int rc = VINF_SUCCESS; unsigned idxBin = drvramdiskMediaExIoReqIdHash(pIoReq->uIoReqId); rc = RTSemFastMutexRequest(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc); if (RT_SUCCESS(rc)) { RTListNodeRemove(&pIoReq->NdAllocatedList); RTSemFastMutexRelease(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc); } return rc; } /** * I/O request completion worker. * * @returns VBox status code. * @param pThis VBox disk container instance data. * @param pIoReq I/O request to complete. * @param rcReq The status code the request completed with. * @param fUpNotify Flag whether to notify the driver/device above us about the completion. */ static int drvramdiskMediaExIoReqCompleteWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, int rcReq, bool fUpNotify) { int rc; bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_COMPLETING, VDIOREQSTATE_ACTIVE); if (fXchg) ASMAtomicDecU32(&pThis->cIoReqsActive); else { Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED); rcReq = VERR_PDM_MEDIAEX_IOREQ_CANCELED; } ASMAtomicXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_COMPLETED); /* * Leave a release log entry if the request was active for more than 25 seconds * (30 seconds is the timeout of the guest). */ uint64_t tsNow = RTTimeMilliTS(); if (tsNow - pIoReq->tsSubmit >= 25 * 1000) { const char *pcszReq = NULL; switch (pIoReq->enmType) { case PDMMEDIAEXIOREQTYPE_READ: pcszReq = "Read"; break; case PDMMEDIAEXIOREQTYPE_WRITE: pcszReq = "Write"; break; case PDMMEDIAEXIOREQTYPE_FLUSH: pcszReq = "Flush"; break; case PDMMEDIAEXIOREQTYPE_DISCARD: pcszReq = "Discard"; break; default: pcszReq = ""; } LogRel(("RamDisk#%u: %s request was active for %llu seconds\n", pThis->pDrvIns->iInstance, pcszReq, (tsNow - pIoReq->tsSubmit) / 1000)); } if (RT_FAILURE(rcReq)) { /* Log the error. */ if (pThis->cErrors++ < 100) { if (rcReq == VERR_PDM_MEDIAEX_IOREQ_CANCELED) { if (pIoReq->enmType == PDMMEDIAEXIOREQTYPE_FLUSH) LogRel(("RamDisk#%u: Aborted flush returned rc=%Rrc\n", pThis->pDrvIns->iInstance, rcReq)); else LogRel(("RamDisk#%u: Aborted %s (%u bytes left) returned rc=%Rrc\n", pThis->pDrvIns->iInstance, pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ ? "read" : "write", pIoReq->ReadWrite.cbReqLeft, rcReq)); } else { if (pIoReq->enmType == PDMMEDIAEXIOREQTYPE_FLUSH) LogRel(("RamDisk#%u: Flush returned rc=%Rrc\n", pThis->pDrvIns->iInstance, rcReq)); else LogRel(("RamDisk#%u: %s (%u bytes left) returned rc=%Rrc\n", pThis->pDrvIns->iInstance, pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ ? "Read" : "Write", pIoReq->ReadWrite.cbReqLeft, rcReq)); } } } if (fUpNotify) { rc = pThis->pDrvMediaExPort->pfnIoReqCompleteNotify(pThis->pDrvMediaExPort, pIoReq, &pIoReq->abAlloc[0], rcReq); AssertRC(rc); } return rcReq; } /** * Allocates a memory buffer suitable for I/O for the given request. * * @returns VBox status code. * @retval VINF_PDM_MEDIAEX_IOREQ_IN_PROGRESS if there is no I/O memory available to allocate and * the request was placed on a waiting list. * @param pThis VBox disk container instance data. * @param pIoReq I/O request to allocate memory for. * @param cb Size of the buffer. */ DECLINLINE(int) drvramdiskMediaExIoReqBufAlloc(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, size_t cb) { int rc = IOBUFMgrAllocBuf(pThis->hIoBufMgr, &pIoReq->ReadWrite.IoBuf, cb, &pIoReq->ReadWrite.cbIoBuf); if (rc == VERR_NO_MEMORY) { RTCritSectEnter(&pThis->CritSectIoReqsIoBufWait); RTListAppend(&pThis->LstIoReqIoBufWait, &pIoReq->NdLstWait); RTCritSectLeave(&pThis->CritSectIoReqsIoBufWait); ASMAtomicIncU32(&pThis->cIoReqsWaiting); rc = VINF_PDM_MEDIAEX_IOREQ_IN_PROGRESS; } return rc; } /** * Worker for a read request. * * @returns VBox status code. * @param pThis RAM disk container instance data. * @param pIoReq The read request. */ static DECLCALLBACK(int) drvramdiskIoReqReadWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq) { size_t cbReqIo = RT_MIN(pIoReq->ReadWrite.cbReqLeft, pIoReq->ReadWrite.cbIoBuf); int rc = drvramdiskReadWorker(pThis, &pIoReq->ReadWrite.IoBuf.SgBuf, pIoReq->ReadWrite.offStart, cbReqIo); drvramdiskMediaExIoReqComplete(pThis, pIoReq, rc); return VINF_SUCCESS; } /** * Worker for a read request. * * @returns VBox status code. * @param pThis RAM disk container instance data. * @param pIoReq The read request. */ static DECLCALLBACK(int) drvramdiskIoReqWriteWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq) { size_t cbReqIo = RT_MIN(pIoReq->ReadWrite.cbReqLeft, pIoReq->ReadWrite.cbIoBuf); int rc = drvramdiskWriteWorker(pThis, &pIoReq->ReadWrite.IoBuf.SgBuf, pIoReq->ReadWrite.offStart, cbReqIo); drvramdiskMediaExIoReqComplete(pThis, pIoReq, rc); return VINF_SUCCESS; } /** * Processes a read/write request. * * @returns VBox status code. * @param pThis VBox disk container instance data. * @param pIoReq I/O request to process. * @param fUpNotify Flag whether to notify the driver/device above us about the completion. */ static int drvramdiskMediaExIoReqReadWriteProcess(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, bool fUpNotify) { int rc = VINF_SUCCESS; Assert(pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ || pIoReq->enmType == PDMMEDIAEXIOREQTYPE_WRITE); while ( pIoReq->ReadWrite.cbReqLeft && rc == VINF_SUCCESS) { if (pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ) rc = RTReqQueueCallEx(pThis->hReqQ, NULL, 0, RTREQFLAGS_NO_WAIT, (PFNRT)drvramdiskIoReqReadWorker, 2, pThis, pIoReq); else { /* Sync memory buffer from the request initiator. */ rc = drvramdiskMediaExIoReqBufSync(pThis, pIoReq, true /* fToIoBuf */); if (RT_SUCCESS(rc)) rc = RTReqQueueCallEx(pThis->hReqQ, NULL, 0, RTREQFLAGS_NO_WAIT, (PFNRT)drvramdiskIoReqWriteWorker, 2, pThis, pIoReq); } if (rc == VINF_SUCCESS) rc = VINF_PDM_MEDIAEX_IOREQ_IN_PROGRESS; } if (rc != VINF_PDM_MEDIAEX_IOREQ_IN_PROGRESS) { Assert(!pIoReq->ReadWrite.cbReqLeft || RT_FAILURE(rc)); rc = drvramdiskMediaExIoReqCompleteWorker(pThis, pIoReq, rc, fUpNotify); } return rc; } /** * Frees a I/O memory buffer allocated previously. * * @returns nothing. * @param pThis VBox disk container instance data. * @param pIoReq I/O request for which to free memory. */ DECLINLINE(void) drvramdiskMediaExIoReqBufFree(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq) { if ( pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ || pIoReq->enmType == PDMMEDIAEXIOREQTYPE_WRITE) { IOBUFMgrFreeBuf(&pIoReq->ReadWrite.IoBuf); if (ASMAtomicReadU32(&pThis->cIoReqsWaiting) > 0) { /* Try to process as many requests as possible. */ RTCritSectEnter(&pThis->CritSectIoReqsIoBufWait); PPDMMEDIAEXIOREQINT pIoReqCur, pIoReqNext; RTListForEachSafe(&pThis->LstIoReqIoBufWait, pIoReqCur, pIoReqNext, PDMMEDIAEXIOREQINT, NdLstWait) { /* Allocate a suitable I/O buffer for this request. */ int rc = IOBUFMgrAllocBuf(pThis->hIoBufMgr, &pIoReqCur->ReadWrite.IoBuf, pIoReqCur->ReadWrite.cbReq, &pIoReqCur->ReadWrite.cbIoBuf); if (rc == VINF_SUCCESS) { ASMAtomicDecU32(&pThis->cIoReqsWaiting); RTListNodeRemove(&pIoReqCur->NdLstWait); bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReqCur->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED); if (RT_UNLIKELY(!fXchg)) { /* Must have been canceled inbetween. */ Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED); drvramdiskMediaExIoReqCompleteWorker(pThis, pIoReqCur, VERR_PDM_MEDIAEX_IOREQ_CANCELED, true /* fUpNotify */); } ASMAtomicIncU32(&pThis->cIoReqsActive); rc = drvramdiskMediaExIoReqReadWriteProcess(pThis, pIoReqCur, true /* fUpNotify */); } else { Assert(rc == VERR_NO_MEMORY); break; } } RTCritSectLeave(&pThis->CritSectIoReqsIoBufWait); } } } /** * Returns whether the VM is in a running state. * * @returns Flag indicating whether the VM is currently in a running state. * @param pThis VBox disk container instance data. */ DECLINLINE(bool) drvramdiskMediaExIoReqIsVmRunning(PDRVRAMDISK pThis) { VMSTATE enmVmState = PDMDrvHlpVMState(pThis->pDrvIns); if ( enmVmState == VMSTATE_RESUMING || enmVmState == VMSTATE_RUNNING || enmVmState == VMSTATE_RUNNING_LS || enmVmState == VMSTATE_RUNNING_FT || enmVmState == VMSTATE_RESETTING || enmVmState == VMSTATE_RESETTING_LS || enmVmState == VMSTATE_SOFT_RESETTING || enmVmState == VMSTATE_SOFT_RESETTING_LS || enmVmState == VMSTATE_SUSPENDING || enmVmState == VMSTATE_SUSPENDING_LS || enmVmState == VMSTATE_SUSPENDING_EXT_LS) return true; return false; } /** * @copydoc FNVDASYNCTRANSFERCOMPLETE */ static void drvramdiskMediaExIoReqComplete(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq, int rcReq) { /* * For a read we need to sync the memory before continuing to process * the request further. */ if ( RT_SUCCESS(rcReq) && pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ) rcReq = drvramdiskMediaExIoReqBufSync(pThis, pIoReq, false /* fToIoBuf */); /* * When the request owner instructs us to handle recoverable errors like full disks * do it. Mark the request as suspended, notify the owner and put the request on the * redo list. */ if ( RT_FAILURE(rcReq) && (pIoReq->fFlags & PDMIMEDIAEX_F_SUSPEND_ON_RECOVERABLE_ERR) && drvramdiskMediaExIoReqIsRedoSetWarning(pThis, rcReq)) { bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_SUSPENDED, VDIOREQSTATE_ACTIVE); if (fXchg) { /* Put on redo list and adjust active request counter. */ RTCritSectEnter(&pThis->CritSectIoReqRedo); RTListAppend(&pThis->LstIoReqRedo, &pIoReq->NdLstWait); RTCritSectLeave(&pThis->CritSectIoReqRedo); ASMAtomicDecU32(&pThis->cIoReqsActive); pThis->pDrvMediaExPort->pfnIoReqStateChanged(pThis->pDrvMediaExPort, pIoReq, &pIoReq->abAlloc[0], PDMMEDIAEXIOREQSTATE_SUSPENDED); } else { /* Request was canceled inbetween, so don't care and notify the owner about the completed request. */ Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED); drvramdiskMediaExIoReqCompleteWorker(pThis, pIoReq, rcReq, true /* fUpNotify */); } } else { /* Adjust the remaining amount to transfer. */ size_t cbReqIo = RT_MIN(pIoReq->ReadWrite.cbReqLeft, pIoReq->ReadWrite.cbIoBuf); pIoReq->ReadWrite.offStart += cbReqIo; pIoReq->ReadWrite.cbReqLeft -= cbReqIo; if ( RT_FAILURE(rcReq) || !pIoReq->ReadWrite.cbReqLeft || ( pIoReq->enmType != PDMMEDIAEXIOREQTYPE_READ && pIoReq->enmType != PDMMEDIAEXIOREQTYPE_WRITE)) drvramdiskMediaExIoReqCompleteWorker(pThis, pIoReq, rcReq, true /* fUpNotify */); else drvramdiskMediaExIoReqReadWriteProcess(pThis, pIoReq, true /* fUpNotify */); } } /** * Worker for a flush request. * * @returns VBox status code. * @param pThis RAM disk container instance data. * @param pIoReq The flush request. */ static DECLCALLBACK(int) drvramdiskIoReqFlushWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq) { /* Nothing to do for a ram disk. */ drvramdiskMediaExIoReqComplete(pThis, pIoReq, VINF_SUCCESS); return VINF_SUCCESS; } /** * Worker for a discard request. * * @returns VBox status code. * @param pThis RAM disk container instance data. * @param pIoReq The discard request. */ static DECLCALLBACK(int) drvramdiskIoReqDiscardWorker(PDRVRAMDISK pThis, PPDMMEDIAEXIOREQINT pIoReq) { int rc = drvramdiskDiscardRecords(pThis, pIoReq->Discard.paRanges, pIoReq->Discard.cRanges); drvramdiskMediaExIoReqComplete(pThis, pIoReq, rc); return VINF_SUCCESS; } /** * @interface_method_impl{PDMIMEDIAEX,pfnQueryFeatures} */ static DECLCALLBACK(int) drvramdiskQueryFeatures(PPDMIMEDIAEX pInterface, uint32_t *pfFeatures) { RT_NOREF1(pInterface); *pfFeatures = PDMIMEDIAEX_FEATURE_F_ASYNC | PDMIMEDIAEX_FEATURE_F_DISCARD; return VINF_SUCCESS; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqAllocSizeSet} */ static DECLCALLBACK(int) drvramdiskIoReqAllocSizeSet(PPDMIMEDIAEX pInterface, size_t cbIoReqAlloc) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); if (RT_UNLIKELY(pThis->hIoReqCache != NIL_RTMEMCACHE)) return VERR_INVALID_STATE; return RTMemCacheCreate(&pThis->hIoReqCache, sizeof(PDMMEDIAEXIOREQINT) + cbIoReqAlloc, 0, UINT32_MAX, NULL, NULL, NULL, 0); } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqAlloc} */ static DECLCALLBACK(int) drvramdiskIoReqAlloc(PPDMIMEDIAEX pInterface, PPDMMEDIAEXIOREQ phIoReq, void **ppvIoReqAlloc, PDMMEDIAEXIOREQID uIoReqId, uint32_t fFlags) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); AssertReturn(!(fFlags & ~PDMIMEDIAEX_F_VALID), VERR_INVALID_PARAMETER); PPDMMEDIAEXIOREQINT pIoReq = (PPDMMEDIAEXIOREQINT)RTMemCacheAlloc(pThis->hIoReqCache); if (RT_UNLIKELY(!pIoReq)) return VERR_NO_MEMORY; pIoReq->uIoReqId = uIoReqId; pIoReq->fFlags = fFlags; pIoReq->pDisk = pThis; pIoReq->enmState = VDIOREQSTATE_ALLOCATED; pIoReq->enmType = PDMMEDIAEXIOREQTYPE_INVALID; int rc = drvramdiskMediaExIoReqInsert(pThis, pIoReq); if (RT_SUCCESS(rc)) { *phIoReq = pIoReq; *ppvIoReqAlloc = &pIoReq->abAlloc[0]; } else RTMemCacheFree(pThis->hIoReqCache, pIoReq); return rc; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqFree} */ static DECLCALLBACK(int) drvramdiskIoReqFree(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); PPDMMEDIAEXIOREQINT pIoReq = hIoReq; if ( pIoReq->enmState != VDIOREQSTATE_COMPLETED && pIoReq->enmState != VDIOREQSTATE_ALLOCATED) return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE; /* Remove from allocated list. */ int rc = drvramdiskMediaExIoReqRemove(pThis, pIoReq); if (RT_FAILURE(rc)) return rc; /* Free any associated I/O memory. */ drvramdiskMediaExIoReqBufFree(pThis, pIoReq); /* For discard request discard the range array. */ if ( pIoReq->enmType == PDMMEDIAEXIOREQTYPE_DISCARD && pIoReq->Discard.paRanges) { RTMemFree(pIoReq->Discard.paRanges); pIoReq->Discard.paRanges = NULL; } pIoReq->enmState = VDIOREQSTATE_FREE; RTMemCacheFree(pThis->hIoReqCache, pIoReq); return VINF_SUCCESS; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqQueryResidual} */ static DECLCALLBACK(int) drvramdiskIoReqQueryResidual(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, size_t *pcbResidual) { RT_NOREF2(pInterface, hIoReq); *pcbResidual = 0; return VINF_SUCCESS; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqQueryXferSize} */ static DECLCALLBACK(int) drvramdiskIoReqQueryXferSize(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, size_t *pcbXfer) { RT_NOREF1(pInterface); PPDMMEDIAEXIOREQINT pIoReq = hIoReq; if ( pIoReq->enmType == PDMMEDIAEXIOREQTYPE_READ || pIoReq->enmType == PDMMEDIAEXIOREQTYPE_WRITE) *pcbXfer = pIoReq->ReadWrite.cbReq; else *pcbXfer = 0; return VINF_SUCCESS; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqCancelAll} */ static DECLCALLBACK(int) drvramdiskIoReqCancelAll(PPDMIMEDIAEX pInterface) { RT_NOREF1(pInterface); return VINF_SUCCESS; /** @todo */ } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqCancel} */ static DECLCALLBACK(int) drvramdiskIoReqCancel(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQID uIoReqId) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); unsigned idxBin = drvramdiskMediaExIoReqIdHash(uIoReqId); int rc = RTSemFastMutexRequest(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc); if (RT_SUCCESS(rc)) { /* Search for I/O request with ID. */ PPDMMEDIAEXIOREQINT pIt; rc = VERR_PDM_MEDIAEX_IOREQID_NOT_FOUND; RTListForEach(&pThis->aIoReqAllocBins[idxBin].LstIoReqAlloc, pIt, PDMMEDIAEXIOREQINT, NdAllocatedList) { if (pIt->uIoReqId == uIoReqId) { bool fXchg = true; VDIOREQSTATE enmStateOld = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIt->enmState); /* * We might have to try canceling the request multiple times if it transitioned from * ALLOCATED to ACTIVE or to SUSPENDED between reading the state and trying to change it. */ while ( ( enmStateOld == VDIOREQSTATE_ALLOCATED || enmStateOld == VDIOREQSTATE_ACTIVE || enmStateOld == VDIOREQSTATE_SUSPENDED) && !fXchg) { fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIt->enmState, VDIOREQSTATE_CANCELED, enmStateOld); if (!fXchg) enmStateOld = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIt->enmState); } if (fXchg) { ASMAtomicDecU32(&pThis->cIoReqsActive); rc = VINF_SUCCESS; } break; } } RTSemFastMutexRelease(pThis->aIoReqAllocBins[idxBin].hMtxLstIoReqAlloc); } return rc; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqRead} */ static DECLCALLBACK(int) drvramdiskIoReqRead(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, uint64_t off, size_t cbRead) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); PPDMMEDIAEXIOREQINT pIoReq = hIoReq; VDIOREQSTATE enmState = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIoReq->enmState); if (RT_UNLIKELY(enmState == VDIOREQSTATE_CANCELED)) return VERR_PDM_MEDIAEX_IOREQ_CANCELED; if (RT_UNLIKELY(enmState != VDIOREQSTATE_ALLOCATED)) return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE; pIoReq->enmType = PDMMEDIAEXIOREQTYPE_READ; pIoReq->tsSubmit = RTTimeMilliTS(); pIoReq->ReadWrite.offStart = off; pIoReq->ReadWrite.cbReq = cbRead; pIoReq->ReadWrite.cbReqLeft = cbRead; /* Allocate a suitable I/O buffer for this request. */ int rc = drvramdiskMediaExIoReqBufAlloc(pThis, pIoReq, cbRead); if (rc == VINF_SUCCESS) { bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED); if (RT_UNLIKELY(!fXchg)) { /* Must have been canceled inbetween. */ Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED); return VERR_PDM_MEDIAEX_IOREQ_CANCELED; } ASMAtomicIncU32(&pThis->cIoReqsActive); rc = drvramdiskMediaExIoReqReadWriteProcess(pThis, pIoReq, false /* fUpNotify */); } return rc; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqWrite} */ static DECLCALLBACK(int) drvramdiskIoReqWrite(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, uint64_t off, size_t cbWrite) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); PPDMMEDIAEXIOREQINT pIoReq = hIoReq; VDIOREQSTATE enmState = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIoReq->enmState); if (RT_UNLIKELY(enmState == VDIOREQSTATE_CANCELED)) return VERR_PDM_MEDIAEX_IOREQ_CANCELED; if (RT_UNLIKELY(enmState != VDIOREQSTATE_ALLOCATED)) return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE; pIoReq->enmType = PDMMEDIAEXIOREQTYPE_WRITE; pIoReq->tsSubmit = RTTimeMilliTS(); pIoReq->ReadWrite.offStart = off; pIoReq->ReadWrite.cbReq = cbWrite; pIoReq->ReadWrite.cbReqLeft = cbWrite; /* Allocate a suitable I/O buffer for this request. */ int rc = drvramdiskMediaExIoReqBufAlloc(pThis, pIoReq, cbWrite); if (rc == VINF_SUCCESS) { bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED); if (RT_UNLIKELY(!fXchg)) { /* Must have been canceled inbetween. */ Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED); return VERR_PDM_MEDIAEX_IOREQ_CANCELED; } ASMAtomicIncU32(&pThis->cIoReqsActive); rc = drvramdiskMediaExIoReqReadWriteProcess(pThis, pIoReq, false /* fUpNotify */); } return rc; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqFlush} */ static DECLCALLBACK(int) drvramdiskIoReqFlush(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); PPDMMEDIAEXIOREQINT pIoReq = hIoReq; VDIOREQSTATE enmState = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIoReq->enmState); if (RT_UNLIKELY(enmState == VDIOREQSTATE_CANCELED)) return VERR_PDM_MEDIAEX_IOREQ_CANCELED; if (RT_UNLIKELY(enmState != VDIOREQSTATE_ALLOCATED)) return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE; pIoReq->enmType = PDMMEDIAEXIOREQTYPE_FLUSH; pIoReq->tsSubmit = RTTimeMilliTS(); bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED); if (RT_UNLIKELY(!fXchg)) { /* Must have been canceled inbetween. */ Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED); return VERR_PDM_MEDIAEX_IOREQ_CANCELED; } ASMAtomicIncU32(&pThis->cIoReqsActive); return RTReqQueueCallEx(pThis->hReqQ, NULL, 0, RTREQFLAGS_NO_WAIT, (PFNRT)drvramdiskIoReqFlushWorker, 2, pThis, pIoReq); } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqDiscard} */ static DECLCALLBACK(int) drvramdiskIoReqDiscard(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, unsigned cRangesMax) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); PPDMMEDIAEXIOREQINT pIoReq = hIoReq; VDIOREQSTATE enmState = (VDIOREQSTATE)ASMAtomicReadU32((volatile uint32_t *)&pIoReq->enmState); if (RT_UNLIKELY(enmState == VDIOREQSTATE_CANCELED)) return VERR_PDM_MEDIAEX_IOREQ_CANCELED; if (RT_UNLIKELY(enmState != VDIOREQSTATE_ALLOCATED)) return VERR_PDM_MEDIAEX_IOREQ_INVALID_STATE; /* Copy the ranges over now, this can be optimized in the future. */ pIoReq->Discard.paRanges = (PRTRANGE)RTMemAllocZ(cRangesMax * sizeof(RTRANGE)); if (RT_UNLIKELY(!pIoReq->Discard.paRanges)) return VERR_NO_MEMORY; int rc = pThis->pDrvMediaExPort->pfnIoReqQueryDiscardRanges(pThis->pDrvMediaExPort, pIoReq, &pIoReq->abAlloc[0], 0, cRangesMax, pIoReq->Discard.paRanges, &pIoReq->Discard.cRanges); if (RT_SUCCESS(rc)) { pIoReq->enmType = PDMMEDIAEXIOREQTYPE_DISCARD; pIoReq->tsSubmit = RTTimeMilliTS(); bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pIoReq->enmState, VDIOREQSTATE_ACTIVE, VDIOREQSTATE_ALLOCATED); if (RT_UNLIKELY(!fXchg)) { /* Must have been canceled inbetween. */ Assert(pIoReq->enmState == VDIOREQSTATE_CANCELED); return VERR_PDM_MEDIAEX_IOREQ_CANCELED; } ASMAtomicIncU32(&pThis->cIoReqsActive); rc = RTReqQueueCallEx(pThis->hReqQ, NULL, 0, RTREQFLAGS_NO_WAIT, (PFNRT)drvramdiskIoReqDiscardWorker, 2, pThis, pIoReq); } return rc; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqGetActiveCount} */ static DECLCALLBACK(uint32_t) drvramdiskIoReqGetActiveCount(PPDMIMEDIAEX pInterface) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); return ASMAtomicReadU32(&pThis->cIoReqsActive); } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqGetSuspendedCount} */ static DECLCALLBACK(uint32_t) drvramdiskIoReqGetSuspendedCount(PPDMIMEDIAEX pInterface) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), 0); uint32_t cIoReqSuspended = 0; PPDMMEDIAEXIOREQINT pIoReq; RTCritSectEnter(&pThis->CritSectIoReqRedo); RTListForEach(&pThis->LstIoReqRedo, pIoReq, PDMMEDIAEXIOREQINT, NdLstWait) { cIoReqSuspended++; } RTCritSectLeave(&pThis->CritSectIoReqRedo); return cIoReqSuspended; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqQuerySuspendedStart} */ static DECLCALLBACK(int) drvramdiskIoReqQuerySuspendedStart(PPDMIMEDIAEX pInterface, PPDMMEDIAEXIOREQ phIoReq, void **ppvIoReqAlloc) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), VERR_INVALID_STATE); AssertReturn(!RTListIsEmpty(&pThis->LstIoReqRedo), VERR_NOT_FOUND); RTCritSectEnter(&pThis->CritSectIoReqRedo); PPDMMEDIAEXIOREQINT pIoReq = RTListGetFirst(&pThis->LstIoReqRedo, PDMMEDIAEXIOREQINT, NdLstWait); *phIoReq = pIoReq; *ppvIoReqAlloc = &pIoReq->abAlloc[0]; RTCritSectLeave(&pThis->CritSectIoReqRedo); return VINF_SUCCESS; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqQuerySuspendedNext} */ static DECLCALLBACK(int) drvramdiskIoReqQuerySuspendedNext(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, PPDMMEDIAEXIOREQ phIoReqNext, void **ppvIoReqAllocNext) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); PPDMMEDIAEXIOREQINT pIoReq = hIoReq; AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), VERR_INVALID_STATE); AssertPtrReturn(pIoReq, VERR_INVALID_HANDLE); AssertReturn(!RTListNodeIsLast(&pThis->LstIoReqRedo, &pIoReq->NdLstWait), VERR_NOT_FOUND); RTCritSectEnter(&pThis->CritSectIoReqRedo); PPDMMEDIAEXIOREQINT pIoReqNext = RTListNodeGetNext(&pIoReq->NdLstWait, PDMMEDIAEXIOREQINT, NdLstWait); *phIoReqNext = pIoReqNext; *ppvIoReqAllocNext = &pIoReqNext->abAlloc[0]; RTCritSectLeave(&pThis->CritSectIoReqRedo); return VINF_SUCCESS; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqSuspendedSave} */ static DECLCALLBACK(int) drvramdiskIoReqSuspendedSave(PPDMIMEDIAEX pInterface, PSSMHANDLE pSSM, PDMMEDIAEXIOREQ hIoReq) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); PPDMMEDIAEXIOREQINT pIoReq = hIoReq; RT_NOREF1(pSSM); AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), VERR_INVALID_STATE); AssertPtrReturn(pIoReq, VERR_INVALID_HANDLE); AssertReturn(pIoReq->enmState == VDIOREQSTATE_SUSPENDED, VERR_INVALID_STATE); return VERR_NOT_IMPLEMENTED; } /** * @interface_method_impl{PDMIMEDIAEX,pfnIoReqSuspendedLoad} */ static DECLCALLBACK(int) drvramdiskIoReqSuspendedLoad(PPDMIMEDIAEX pInterface, PSSMHANDLE pSSM, PDMMEDIAEXIOREQ hIoReq) { PDRVRAMDISK pThis = RT_FROM_MEMBER(pInterface, DRVRAMDISK, IMediaEx); PPDMMEDIAEXIOREQINT pIoReq = hIoReq; RT_NOREF1(pSSM); AssertReturn(!drvramdiskMediaExIoReqIsVmRunning(pThis), VERR_INVALID_STATE); AssertPtrReturn(pIoReq, VERR_INVALID_HANDLE); AssertReturn(pIoReq->enmState == VDIOREQSTATE_ALLOCATED, VERR_INVALID_STATE); return VERR_NOT_IMPLEMENTED; } static DECLCALLBACK(int) drvramdiskIoReqWorker(RTTHREAD hThrdSelf, void *pvUser) { int rc = VINF_SUCCESS; PDRVRAMDISK pThis = (PDRVRAMDISK)pvUser; RT_NOREF1(hThrdSelf); do { rc = RTReqQueueProcess(pThis->hReqQ, RT_INDEFINITE_WAIT); } while (RT_SUCCESS(rc)); return VINF_SUCCESS; } /* -=-=-=-=- IBase -=-=-=-=- */ /** * @interface_method_impl{PDMIBASE,pfnQueryInterface} */ static DECLCALLBACK(void *) drvramdiskQueryInterface(PPDMIBASE pInterface, const char *pszIID) { PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface); PDRVRAMDISK pThis = PDMINS_2_DATA(pDrvIns, PDRVRAMDISK); PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase); PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIA, &pThis->IMedia); PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIAEX, &pThis->IMediaEx); return NULL; } /* -=-=-=-=- driver interface -=-=-=-=- */ static DECLCALLBACK(int) drvramdiskTreeDestroy(PAVLRFOFFNODECORE pNode, void *pvUser) { PDRVDISKSEGMENT pSeg = (PDRVDISKSEGMENT)pNode; RT_NOREF1(pvUser); RTMemFree(pSeg->pbSeg); RTMemFree(pSeg); return VINF_SUCCESS; } /** * @copydoc FNPDMDRVDESTRUCT */ static DECLCALLBACK(void) drvramdiskDestruct(PPDMDRVINS pDrvIns) { PDRVRAMDISK pThis = PDMINS_2_DATA(pDrvIns, PDRVRAMDISK); if (pThis->pTreeSegments) { RTAvlrFileOffsetDestroy(pThis->pTreeSegments, drvramdiskTreeDestroy, NULL); RTMemFree(pThis->pTreeSegments); } } /** * Construct a disk integrity driver instance. * * @copydoc FNPDMDRVCONSTRUCT */ static DECLCALLBACK(int) drvramdiskConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags) { RT_NOREF1(fFlags); int rc = VINF_SUCCESS; uint32_t cbIoBufMax; PDRVRAMDISK pThis = PDMINS_2_DATA(pDrvIns, PDRVRAMDISK); LogFlow(("drvdiskintConstruct: iInstance=%d\n", pDrvIns->iInstance)); PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns); /* * Validate configuration. */ if (!CFGMR3AreValuesValid(pCfg, "Size\0" "PreAlloc\0" "IoBufMax\0" "SectorSize\0" "NonRotational\0")) return VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES; rc = CFGMR3QueryU64(pCfg, "Size", &pThis->cbDisk); if (RT_FAILURE(rc)) return PDMDRV_SET_ERROR(pDrvIns, rc, N_("RamDisk: Error querying the media size")); rc = CFGMR3QueryBoolDef(pCfg, "PreAlloc", &pThis->fPreallocRamDisk, false); if (RT_FAILURE(rc)) return PDMDRV_SET_ERROR(pDrvIns, rc, N_("RamDisk: Error querying \"PreAlloc\"")); rc = CFGMR3QueryBoolDef(pCfg, "NonRotational", &pThis->fNonRotational, true); if (RT_FAILURE(rc)) return PDMDRV_SET_ERROR(pDrvIns, rc, N_("RamDisk: Error querying \"NonRotational\"")); rc = CFGMR3QueryU32Def(pCfg, "IoBufMax", &cbIoBufMax, 5 * _1M); if (RT_FAILURE(rc)) return PDMDRV_SET_ERROR(pDrvIns, rc, N_("Failed to query \"IoBufMax\" from the config")); rc = CFGMR3QueryU32Def(pCfg, "SectorSize", &pThis->cbSector, 512); if (RT_FAILURE(rc)) return PDMDRV_SET_ERROR(pDrvIns, rc, N_("Failed to query \"SectorSize\" from the config")); /* * Initialize most of the data members. */ pThis->pDrvIns = pDrvIns; /* IBase. */ pDrvIns->IBase.pfnQueryInterface = drvramdiskQueryInterface; /* IMedia */ pThis->IMedia.pfnRead = drvramdiskRead; pThis->IMedia.pfnWrite = drvramdiskWrite; pThis->IMedia.pfnFlush = drvramdiskFlush; pThis->IMedia.pfnGetSize = drvramdiskGetSize; pThis->IMedia.pfnBiosIsVisible = drvramdiskBiosIsVisible; pThis->IMedia.pfnGetType = drvramdiskGetType; pThis->IMedia.pfnIsReadOnly = drvramdiskIsReadOnly; pThis->IMedia.pfnBiosGetPCHSGeometry = drvramdiskBiosGetPCHSGeometry; pThis->IMedia.pfnBiosSetPCHSGeometry = drvramdiskBiosSetPCHSGeometry; pThis->IMedia.pfnBiosGetLCHSGeometry = drvramdiskBiosGetLCHSGeometry; pThis->IMedia.pfnBiosSetLCHSGeometry = drvramdiskBiosSetLCHSGeometry; pThis->IMedia.pfnGetUuid = drvramdiskGetUuid; pThis->IMedia.pfnGetSectorSize = drvramdiskGetSectorSize; pThis->IMedia.pfnReadPcBios = drvramdiskReadPcBios; pThis->IMedia.pfnDiscard = drvramdiskDiscard; pThis->IMedia.pfnIsNonRotational = drvramdiskIsNonRotational; /* IMediaEx */ pThis->IMediaEx.pfnQueryFeatures = drvramdiskQueryFeatures; pThis->IMediaEx.pfnIoReqAllocSizeSet = drvramdiskIoReqAllocSizeSet; pThis->IMediaEx.pfnIoReqAlloc = drvramdiskIoReqAlloc; pThis->IMediaEx.pfnIoReqFree = drvramdiskIoReqFree; pThis->IMediaEx.pfnIoReqQueryResidual = drvramdiskIoReqQueryResidual; pThis->IMediaEx.pfnIoReqQueryXferSize = drvramdiskIoReqQueryXferSize; pThis->IMediaEx.pfnIoReqCancelAll = drvramdiskIoReqCancelAll; pThis->IMediaEx.pfnIoReqCancel = drvramdiskIoReqCancel; pThis->IMediaEx.pfnIoReqRead = drvramdiskIoReqRead; pThis->IMediaEx.pfnIoReqWrite = drvramdiskIoReqWrite; pThis->IMediaEx.pfnIoReqFlush = drvramdiskIoReqFlush; pThis->IMediaEx.pfnIoReqDiscard = drvramdiskIoReqDiscard; pThis->IMediaEx.pfnIoReqGetActiveCount = drvramdiskIoReqGetActiveCount; pThis->IMediaEx.pfnIoReqGetSuspendedCount = drvramdiskIoReqGetSuspendedCount; pThis->IMediaEx.pfnIoReqQuerySuspendedStart = drvramdiskIoReqQuerySuspendedStart; pThis->IMediaEx.pfnIoReqQuerySuspendedNext = drvramdiskIoReqQuerySuspendedNext; pThis->IMediaEx.pfnIoReqSuspendedSave = drvramdiskIoReqSuspendedSave; pThis->IMediaEx.pfnIoReqSuspendedLoad = drvramdiskIoReqSuspendedLoad; /* Query the media port interface above us. */ pThis->pDrvMediaPort = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMIMEDIAPORT); if (!pThis->pDrvMediaPort) return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_BELOW, N_("No media port interface above")); /* Try to attach extended media port interface above.*/ pThis->pDrvMediaExPort = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMIMEDIAEXPORT); if (pThis->pDrvMediaExPort) { for (unsigned i = 0; i < RT_ELEMENTS(pThis->aIoReqAllocBins); i++) { rc = RTSemFastMutexCreate(&pThis->aIoReqAllocBins[i].hMtxLstIoReqAlloc); if (RT_FAILURE(rc)) break; RTListInit(&pThis->aIoReqAllocBins[i].LstIoReqAlloc); } if (RT_SUCCESS(rc)) rc = RTCritSectInit(&pThis->CritSectIoReqsIoBufWait); if (RT_SUCCESS(rc)) rc = RTCritSectInit(&pThis->CritSectIoReqRedo); if (RT_FAILURE(rc)) return PDMDRV_SET_ERROR(pDrvIns, rc, N_("Creating Mutex failed")); RTListInit(&pThis->LstIoReqIoBufWait); RTListInit(&pThis->LstIoReqRedo); } /* Create the AVL tree. */ pThis->pTreeSegments = (PAVLRFOFFTREE)RTMemAllocZ(sizeof(AVLRFOFFTREE)); if (!pThis->pTreeSegments) rc = VERR_NO_MEMORY; if (pThis->pDrvMediaExPort) { rc = RTReqQueueCreate(&pThis->hReqQ); if (RT_SUCCESS(rc)) { /* Spin up the worker thread. */ rc = RTThreadCreate(&pThis->hThrdWrk, drvramdiskIoReqWorker, pThis, 0, RTTHREADTYPE_IO, 0, "RAMDSK"); } } if (pThis->pDrvMediaExPort) rc = IOBUFMgrCreate(&pThis->hIoBufMgr, cbIoBufMax, IOBUFMGR_F_DEFAULT); /* Read in all data before the start if requested. */ if ( RT_SUCCESS(rc) && pThis->fPreallocRamDisk) { LogRel(("RamDisk: Preallocating RAM disk...\n")); return VERR_NOT_IMPLEMENTED; } return rc; } /** * Block driver registration record. */ const PDMDRVREG g_DrvRamDisk = { /* u32Version */ PDM_DRVREG_VERSION, /* szName */ "RamDisk", /* szRCMod */ "", /* szR0Mod */ "", /* pszDescription */ "RAM disk driver.", /* fFlags */ PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT, /* fClass. */ PDM_DRVREG_CLASS_BLOCK, /* cMaxInstances */ ~0U, /* cbInstance */ sizeof(DRVRAMDISK), /* pfnConstruct */ drvramdiskConstruct, /* pfnDestruct */ drvramdiskDestruct, /* pfnRelocate */ NULL, /* pfnIOCtl */ NULL, /* pfnPowerOn */ NULL, /* pfnReset */ NULL, /* pfnSuspend */ NULL, /* pfnResume */ NULL, /* pfnAttach */ NULL, /* pfnDetach */ NULL, /* pfnPowerOff */ NULL, /* pfnSoftReset */ NULL, /* u32EndVersion */ PDM_DRVREG_VERSION };