/* fops */ static int sf_reg_read_aux(const char *caller, struct sf_glob_info *sf_g, struct sf_reg_info *sf_r, void *buf, uint32_t *nread, uint64_t pos) { /** @todo bird: yes, kmap() and kmalloc() input only. Since the buffer is * contiguous in physical memory (kmalloc or single page), we should * use a physical address here to speed things up. */ int rc = vboxCallRead(&client_handle, &sf_g->map, sf_r->handle, pos, nread, buf, false /* already locked? */); if (RT_FAILURE(rc)) { LogFunc(("vboxCallRead failed. caller=%s, rc=%Rrc\n", caller, rc)); return -EPROTO; } return 0; }
static int vbsfTransferBufferRead(PVBSFCLIENT pClient, PVBSFMAP pMap, SHFLHANDLE hFile, uint64_t offset, uint32_t *pcbBuffer, uint8_t *pBuffer, bool fLocked) { return vboxCallRead(pClient, pMap, hFile, offset, pcbBuffer, pBuffer, fLocked); }
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; }